Method and system for realising single radio voice call continuity

FIELD: radio engineering, communication.

SUBSTANCE: after user equipment (UE-1) establishes an IP multimedia messaging (IMS) session with a remote area via a packet switch (PS) network, wherein in the IMS session, signalling is anchored to an IMS control point (ICP) and media is anchored to an access gateway (AGW) controlled by the ICP, the disclosed method is carried out, comprising: sending a switch-over request by a control net element of the PS network to an enhanced mobile switch centre (eMSC) to request switch-over of the IMS session to a circuit switch (CS) network access mode; after receiving the switch-over request, preparing a media link resource by the eMSC for the UE-1 to communicate with the eMSC and sending a connection request to the ICP; and controlling the AGW to correlate a media link established by the connection request with a remote area media link of the IMS session by the ICP.

EFFECT: reducing the communication interruption time and improving communication quality for the user.

13 cl, 20 dwg

The SCOPE of the INVENTION

The invention relates to the field of communications, in particular to a method of implementing a separate continuity of a voice call on the radio interface and the separate continuity of a voice call on the radio interface (SRVCC).

PRIOR art

Subsystem multimedia messaging based on the Internet Protocol (IMS) is a network architecture based on IP Protocol, the proposed project third generation partnership (3GPP). It is an open and flexible working environment with support for multimedia applications, which allows you to provide users with various multimedia services.

In the service of the IMS system, the management layer is separated from the service level and provides a service level of all necessary functions, such as processing triggers, routing and billing (but not a separate service!).

At the level of the control function of the launch of the service and function control performed by the control session (CSCF), which is divided into the following three types: serving CSCF (S-CSCF), a proxy CSCF (P-CSCF) and the requesting CSCF (I-CSCF), the main role is played by the function S-CSCF, and the I-CSCF is optional.

The service layer consists of multiple application servers (AS), can provide the required services is, thus, the application server may be an independent entity or part of the function S-CSCF.

Level control S-CSCF controls the activation of services in accordance with the data on the user's subscription and calls the service application server AS to perform the functions required services. The application server AS and the function S-CSCF can be attributed to the server equipment (SE).

Device direct communication used in the session, which is called a subscriber equipment (UE), is responsible for the interaction with the user. Some types of subscriber equipment can gain access to the network in various ways; for example, through the domain of packet switching (PS) of the 3GPP standard, via the PS domain that does not support the 3GPP standard, or even by domain switching channels (CS).

If the network circuit-switched (CS) has improved center mobile switching (eMSC), which provides an interface Protocol to establish a communication session (SIP) to communicate with the IMS network, the communications network IMS and CS can be accessed through the center of the eMSC.

If the user equipment UE has multiple access modes and performs some service (e.g., service connection) in a particular access mode, which uses data subscriber equipment exclusively at a particular point in time, you change MESTNAJA the Denia equipment he would have to change the access mode while in the subscriber equipment and the network provides the possibility of providing some protection performed a subscriber's equipment, service interruption; this feature is called single terminal continuity of a voice call on the phone (it is a separate continuity of a voice call on the radio, then SRVCC).

1 schematically illustrates the implementation of SRVCC, which has a signaling channel and a media channel for establishing a collaboration session has a separate terminal UE-1 with the IMS terminal UE-2 and the signaling channel and a media channel for interaction between UE-1 and UE-2 after the implementation of SRVCC. To simplify the illustrations and descriptions of the function S-CSCF and the application server service continuity (SC AS) is represented as a single object, and the interaction between them is performed by SIP-based IMS standards.

To implement SRVCC terminals UE-1 and UE-2 establish the communication session by means described below signal channels;

A102: signaling channel connecting the terminal UE-1 and the function P-CSCF, which interact with each other via SIP IMS, with this signaling channel is part of the access channel to the server SCAS;

A104: signaling channel linking function P-CSCF and the SCAS server or function, S-CSCF, which in aimogasta with each other via SIP IMS, this signaling channel is also part of the access channel to the server SCAS;

R101: the signaling channel connecting the server SC or AS a function of the S-CSCF with the terminal UE-2, which communicate with each other via SIP IMS, with this signaling channel is a remote section of the channel for the server SC AS;

after the implementation of SRVCC signaling channel and a media channel between the terminal UE-1 and UE-2 is changed following the change of the signal channels:

A112: signaling channel connecting the terminal UE-1 and the center of eMSC, which interact with each other through signaling Protocol domain switching channels CS, with this signaling channel is part of the access channel to the server SCAS;

A: signaling channel, connecting the center of eMSC and the server SC AS or function, S-CSCF, which interact with each other via SIP IMS, with this signaling channel is also part of the access channel to the server SC AS;

R101: the signaling channel connecting the server SC or AS a function of the S-CSCF with the terminal UE-2, which communicate with each other via SIP IMS, with this signaling channel is a remote stretch of the canal for the SCAS server and does not change when implementing SRVCC.

Figure 2 schematically shows the current architecture of the SRVCC; below describes the HN network elements (network elements), involved in the implementation of SRVCC, as well as the interfaces and links between them:

description of network elements:

UE: target user equipment that supports SRVCC;

the CS network: a network which provides the user with traditional services switching channels;

the network of the PS network, providing user services packet switching, while managing a network element of the network is node mobility management (MME) or serving GPRS support node (SGSN);

eMSC: center eMSC, which processes the request on the switch sent to the managing network element of the PS network, performs the transition between domains for this session, as well as coordinate the operation switch to CS operation cross-domain move;

IMS network: a network which provides the user with the IMS services;

description of related interfaces:

S202: the radio interface between the terminal UE and the CS network (the radio interface CS) for data exchange between the terminal UE and the CS network, such as a standard air interface (Urn-interface);

S204: the radio interface between the terminal UE and managing a network element of the PS network (the radio interface PS) for data exchange between the terminal UE and managing a network element of the PS network, for example, the standard radio interface (Uu interface);

S206: the interface between the CS network and the center eMSC (hereinafter ignaliny interface CS), which varies depending on the specific connected network element, for example, the interface between the center of eMSC and the base station subsystem is a standard lu-CS interface, and the interfaces between the center of eMSC and other mobile communications are standard interoffice signaling interfaces (E-interface Nc interface);

S208: a signaling interface between the control network element of the PS network and centre eMSC to support cross-domain switch (hereinafter the signal interface cross-domain switching), which is a standard Sv-interface;

S210: the signal interface between the control network element of the PS network and the Internet, for example, the standard SGi interface, which allows you to provide a data transmission channel IP to exchange data between the terminal UE and the Internet, the IMS network can be considered as a special Internet because it is based on the Internet;

S212: the signaling channel, connecting the center of eMSC and the IMS network, which may be a standard 12-the interface between the center eMSC network and the IMS-based SIP Protocol standard IMS or channel obtained by connecting a standard Nc-interface between the center of eMSC and the network gateway with standard Mg-interface between the network gateway and the IMS network; if the channel is about the means of the latter, the network gateway will convert the message to Nc interface in a SIP message to the IMS, and Vice versa; Nc-interface may be an interface Nc-SIP SIP or interface Nc-ISUP Protocol based subsystem user ISDN - (ISUP). Although Nc-SIP interface and 12-interface both based on the SIP Protocol, this Protocol regulates only the format of the message, but not its contents (the content of the message is determined by the specific application), the use of 12-interface suggests that the center eMSC supports associated with IMS applications, and the use of Nc-SIP interface suggests that the center eMSC supports traditional applications associated with CS.

Figure 3 shows a block diagram of an existing way to implement SRVCC, which describes the process of establishing the IMS session between the terminal UE-1 and UE-2, results in the creation of media connecting channel IMS, consisting of a media connection between the terminal UE-1 and control network element of the PS network, and a media connection between the control network element of the PS network and the terminal UE-2, and describes the process of establishing a media connection to the network terminal UE-1 through CS-domain support of the terminal UE-1, and the continuity of the previous session is saved after the terminal UE-1 is used SRVCC. The process consists of the trail is proposed steps:

step 301: the terminal UE-1 through an interface S204 between the terminal UE-1 and control network element of the PS network sends to the managing network element of the PS network, which serves the terminal UE-1, the measuring report containing information about the results of measurements of cellular signal power;

step 302: the control network element of the PS network, which serves the terminal UE-1 (source managing a network element of the PS network), contained in the measuring report information on the results of the power measurement cell signal determines that the neighboring network CS is better suited to service the terminal UE-1, and decides to perform a switching operation;

step 303: the original managing a network element of the PS network (e.g., the node MME or SGSN) through an interface S208 between the control network element of the PS network and the center of the eMSC sends the centre eMSC switch request, such as request messages to the switch, which contains the number information of the terminal UE-1 and number information about the server SC AS identifying the request continuity of a voice call on the radio interface, which is managing the network element of the PS network through server subscriber data server (HSS);

step 304: the center eMSC performs standard CS-switching, to prepare the resource display line to the target network CS;

step 305: the donkey process CS-switching center via eMSC interface S208 Manager sends a network element of the PS network response message switching;

step 306: after receiving the response message on the switch managing the network element of the PS network through an interface S204 sends to the terminal UE-1 command message about switching to notify the terminal UE-1 implementation of the switch in the CS domain;

step 307: after receiving the command message about switching the terminal UE-1 changes its mode of access to the access mode of the CS domain;

thus, between the terminal UE-1 and the center of the eMSC is set to display the connecting channel CS, which consists of a media connection between CS terminal UE-1 and the CS network, and display the CS connection between the CS network and the center eMSC;

the steps below are followed by step 303 and are not a continuation of the steps 304-307;

step 308: after receiving the message requesting switching from the control network element of the PS network center eMSC sends to the server SC AS the connection request;

sent on the signaling channel S212 (signal channel interaction and internal communication), the connection request may be a SIP INVITE to the or initial address message (IAM message) subsystem ISUP; number information of the terminal UE-1 and number information about the server SC AS contained in the connection request, while the number information server SC AS acts as information about the callee object, and number information of the terminal is Ala UE-1 - as information about the caller;

step 309: finally, the server SC AS receives a SIP INVITE to the IMS, which forwards the function CSCF, and determines information about the callee object that the message is a request continuity of a voice call on the radio, and then in accordance with information about the caller finds a valid connection related to the current call;

step 310: the server SC AS sends to the terminal UE-2 query update IMS, for example, the UPDATE message or relNVITE, using the function CSCF and the signaling channel of the respective active compound;

step 311: after receiving the request to update the terminal UE-2 in response sends a confirmation pack with standard IMS, for example, in the form of a 200 OK message;

step 312: after receiving a confirmation message updates, which forwards the function CSCF server SC AS sends the centre eMSC through the signaling channel S212 response, for example, in the form of a message 200 OK, with the resulting center eMSC message may be a 200 OK message to the SIP Protocol or the response message ANM subsystem ISUP;

thus, between the center of eMSC and the terminal UE-2 is established, a new media channel, while the centre eMSC connects new media channel media channel CS to the terminal UE-1 could continue in order to communicate with the terminal UE-2.

From the foregoing it is obvious that as located in the home network server SC AS does not bind media channel, the steps 310-311 it is necessary to perform the refresh operation on the remote site when to implement SRVCC is an existing method; however, the transmission delay of the signal IMS data for the update operation is quite high, resulting to the establishment of a new media channel requires a lot of time, even if it has already been installed media channel CS, which leads to high latency connection.

DISCLOSURE of INVENTIONS

The present invention aims to solve the existing technical problem by eliminating the disadvantages of the prior art and to provide a method implementation SRVCC and SRVCC system without using the update operation on a remote site.

For solving the above technical problem the present invention provides a method of implementing a separate continuity of a voice call on the radio interface after the user equipment UE-1 install remote site communication session in accordance with the architecture of the subsystem multimedia messaging based on the Internet Protocol (IMS) through a network of packet switching (PS), while in the IMS session signalling part is bound to the control point IMS (ICP), and the media is the first part binds to the access gateway (AGW) running point ICP; the method is as follows;

through the control network element of the PS network in the superior center mobile switching (eMSC) sends a request for switching the session in IMS access network circuit switching (CS);

after receiving the request for switching centre eMSC prepares resource display line, to the terminal UE-1 can interact with the center eMSC, after which point the ICP sends a connection request; and

through point ICP is managed by the gateway AGW to negotiate media line formed with the connection request, the media line remote section of the IMS session.

The method may also include the following:

sent by the center eMSC connection request may be a request message connection in accordance with the Protocol to establish a communication session (SIP), which contains the address of the H-transfer, re-allocated by the centre eMSC to receive media data in the newly installed display line;

on the step, during which point ICP reconciliations of display lines formed by using a connection request from the media line remote section of the IMS session, you will do the following: after receiving the request message for the connection of SIP Protocol is negotiated, the address N of the transmission with the external host ADR is som F remote site media line through point ICP, then the center of the eMSC through the message of the SIP response is sent to the address J of the transmission for receiving media data sent by the center of eMSC in the newly established media line.

The method may also include the following:

on the step, during which point ICP reconciliations of display lines formed by using a connection request from the media line remote section of the IMS session, you will do the following:

after a message is received with the connection request, the SIP gateway AGW through point ICP sends a request to the mapping that contains the address N of the transmission; and

address N is passed through the gateway AGW is consistent with the remote site media line, and is the address J of the transmission, which is sent to the point by ICP response mappings.

The method may also include the following:

sent by the center eMSC the connection request may represent an initial address message Protocol subsystem user ISDN - (ISUP), which contains the line number L1 resource recently installed media line that the final device eMSC uses to transmit display data CS; and

on the step, during which point ICP reconciliations of display lines formed by using a connection request from the media line is th remote section of the IMS session, you will do the following: after receiving the initial address message point ICP returns to the center of the eMSC answer message ANM subsystem ISUP, which contains the line number L2 resource recently installed media line used to transmit display data CS between the end device eMSC and the remote site.

The method may also include the following:

on the step, during which point ICP reconciliations of display lines formed by using a connection request to a remote area of media lines, session IMS, is the following:

after receiving the initial address message by point ICP gateway AGW sends a request to the mapping that contains the line number L1; and

after receipt of the request for mapping line number L1 through gateway AGW is consistent with the remote site media line and a line L2, which goes point by ICP response mappings.

To solve the above technical problem the present invention provides for the implementation of the separate continuity of a voice call on the radio interface, which includes the following: managing a network element of a network of packet switching (PS)network circuit switching (CS), improved center mobile switching (eMSC), the reference point is adsystem multimedia messaging based on the Internet Protocol (ICP) and the access gateway (AGW), thus

managing a network element of the PS network is configured to send the center eMSC switch request, which requests the switching of the IMS session in the access mode of the CS network, and the IMS session is a communication session established subscriber equipment (UE-1) with a remote site through a network of PS, in which the signal part is bound to the point of ICP, and the media is bound to the gateway AGW running point ICP;

center eMSC is configured so that upon receiving a request to switch to prepare the resource display line, which allows the terminal UE-1 to interact with the center eMSC, and then send the point ICP the connection request; and

point ICP is configured to control the gateway AGW to negotiate media lines, which are formed by means of a connection request from a remote site display line of the IMS session.

The system can also provide the following:

sent by the center eMSC connection request may be a request message connection in accordance with the Protocol session initiation (SIP)that contains the address of H transmission, which again highlighted the center of eMSC for receiving media data in the newly installed display line; and

point ICP may be additionally configured that is they way so after receiving the request message for connection SIP to reconcile the address N of the transmission with the external host address F remote site media line, and then through the message of the SIP response to send to the center eMSC address J of the transmission for receiving media data sent by the center of eMSC in the newly established media line.

The system can also provide the following:

point ICP may be further configured to, after receiving the request message for connection SIP to send to the gateway AGW query on the mapping that contains the address H of the transmission; and

gateway AGW can be configured to carry out the agreement addresses N transmission to a remote site media line, highlight the address J of the transmission and send it point by ICP response mappings.

The system can also provide the following:

sent by the center eMSC the connection request may represent an initial address message Protocol subsystem user ISDN - (ISUP), which contains the line number L1 resource recently installed media line that the final device eMSC uses to transmit display data CS; and

point ICP may be further configured so that after receiving the initial address communicated to the I to return to the center of the eMSC answer message ANM subsystem ISUP, contains the line number L2 resource recently installed media line, which is used to transfer media data between CS target device eMSC and the remote site.

The system can also provide the following:

point ICP may be further configured so that after receiving the initial address message to send to the gateway AGW query on the mapping that contains the line number L1; and

gateway AGW can be configured so that upon receiving a request to map to carry out the agreement number line L1 with the remote site media line, highlight the line number L2 and send it point by ICP response mappings.

To solve the above technical problem the present invention provides a controller for a system implementing a separate continuity of a voice call on the radio interface, which consists of interconnected host module and a matching module, with:

a receiving module configured to receive a connection request from the centre of eMSC and to inform the matching module; and

a matching module configured to control the gateway AGW to negotiate formed by the connection request display line to a remote site honey is Inoi line IMS session according to the received connection request after as the terminal UE-1 will establish an IMS session with a remote site via the PS network, the IMS session signalling part is bound to the controller, and the display part is bound to the gateway AGW, which is controlled by the controller.

The controller may also include the following:

sent by the center eMSC connection request may be a request message connection in accordance with the Protocol session initiation (SIP)that contains the address of H transmission, which again highlighted the center of eMSC for receiving media data in the newly installed display line; and

the matching module may be further configured to execute the agreement addresses N transfer from the external host address F remote site media line, and then through the message of the SIP response to send to the center eMSC address J of the transmission for receiving media data sent by the center of eMSC in the newly established media line.

The controller may also include the following:

sent by the center eMSC the connection request may represent an initial address message Protocol subsystem user ISDN - (ISUP), which contains the line number L1 resource recently installed media line that the final device eMSC uses to transmit display data CS; and

the module is oglasavanja may be further configured to return to the center of the eMSC answer message ANM subsystem ISUP containing the line number L2 resource recently installed media line, which is used to transfer media data between CS target device eMSC and the remote site.

In comparison with the prior art, improved architecture SVRCC and the way of its implementation, described in this invention can effectively shorten the duration of the interruption and to significantly improve the quality of work for the user.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 - schematic representation SRVCC;

Figure 2 - schematic representation of the existing architecture SRVCC;

Figure 3 - block diagram of an existing way to implement SRVCC;

4 is a schematic representation of the architecture of the improved SRVCC in accordance with the embodiment of the present invention;

5 is a block diagram of the improved SRVCC in accordance with the embodiment of the present invention;

6 is a schematic depiction of architecture 1 improved SRVCC in accordance with the embodiment of the present invention;

7 - block diagram 1 (Nc SIP) improved SRVCC architecture-based 1 in accordance with the embodiment of the present invention;

Fig - block diagram 2 (Nc-ISUP) improved SRVCC architecture-based 1 in accordance with embodiment n the present invention;

Fig.9 is a schematic depiction of architecture architecture-based 1, at which point the ICP and the gateway PGW or the GGSN integrated, in accordance with the embodiment of the present invention;

Figure 10 - schematic representation of the architecture based on the architecture 1, at which point the ICP and the center eMSC integrated, in accordance with the embodiment of the present invention;

11 is a block diagram of the improved SRVCC from Figure 10 in accordance with the embodiment of the present invention;

Fig is a schematic depiction of architecture architecture-based 1, at which point the ICP and the gateway AGW is integrated, in accordance with the embodiment of the present invention;

Fig is a schematic depiction of architecture architecture-based 1, at which point the ICP, the gateway AGW and the gateway PGW or the GGSN integrated, in accordance with the embodiment of the present invention;

Fig - schematic representation of the architecture 2 improved SRVCC in accordance with the embodiment of the present invention;

Fig - block diagram (Nc SIP) improved SRVCC architecture-based 2 in accordance with the embodiment of the present invention;

Fig is a schematic depiction of architecture architecture-based 2, at which point the ICP and function P-CSCF integrated, in accordance with the embodiment of the present invention;

Fig with emedicine image architecture architecture-based 2, at which point the ICP and the center eMSC integrated, in accordance with the embodiment of the present invention;

Fig is a block diagram of the improved SRVCC from Fig in accordance with the embodiment of the present invention;

Fig is a schematic depiction of architecture architecture-based 2, at which point the ICP and the server SC AS integrated, in accordance with the embodiment of the present invention;

Fig is a block diagram of the improved SRVCC from Fig in accordance with the embodiment of the present invention.

The BEST OPTION of carrying out the INVENTION

The key idea of this invention is as follows: enter the expanding network element to bind the signaling and media data (or use an existing network element corresponding functions), while after the implementation of SRVCC in this expanding network element sends signaling information, after which he stops the transmission of signaling information by matching session and updates the local area media channel original session, while maintaining the remote site unchanged.

Further, the present invention is described with references to embodiments of and the attached drawings.

Figure 4 schematically shows the architecture of the improved SRVCC in accordance with one variant of implementation is tvline of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them;

below is a detailed description:

description of network elements:

standard elements SRVCC architecture: all network elements are similar to the corresponding elements of Figure 2, except for the absence of an IMS network;

the extension consists of the following network elements:

checkpoint IMS (ICP) to control the access gateway (AGW) for the purpose of resource allocation and matching or coordination of media channels;

gateway AGW to forward media data; and network elements of the IMS: standard network elements of an IMS network,

at this point the ICP and the gateway AGW may in various embodiments of the invention as to be part of the IMS network, and do not enter into its composition;

description of related interfaces:

S402-S410: similar interfaces S202-S210 of Figure 2, and since the extension is based on the Internet, the interface S410 is not connected with any specific network element;

S412: the signal interface between IMS subscriber equipment UE and expansion, which represents a logical interface for the transfer of IMS signalling information in the interaction terminal UE and expansion; the network element that connects to this interface depends on the t of a particular variant implementation, in the case when the location of the ICP and the gateway AGW are part of the IMS network, this interface may not appear on the figures and in the description, as in this case, the connection is standard;

S414: the same interface S212 of Figure 2;

S416: the signal interface point between the ICP and the gateway AGW, by which point the ICP controls the gateway AGW for resource allocation, mapping and coordination of media channels;

S418: the signal interface point between the ICP and the IMS network element to send the message Protocol between IMS subscriber equipment UE and P-CSCF, or Protocol messages between IMS P-CSCF and I-CSCF or S-CSCF, or Protocol messages between IMS function CSCF server SC AS, depending on the specific location of the point ICP.

Figure 5 shows a block diagram of the improved SRVCC in accordance with the embodiment of the present invention, showing the process of the establishment of the IMS session between the terminal UE-1 and UE-2 and the subsequent establishment of the media connection terminal UE-1 through CS domain with the support of the terminal UE-1 and the network, while the continuity of the previous session is stored once for the terminal UE-1 is used SRVCC; this process consists of the following steps:

steps 501-502: the terminal UE-1 initiates the connection request IMS, for example, by sending an INVITE message, the connection request which is passed through the interfaces S404 and S410 on the data channel IP which creates the managing network element of the PS network, i.e. the connection request goes via the control network element of the PS network; information about the address of the transmission terminal UE-1 to receive the media data contained in the connection request and is denoted by V; then the connection request is transferred to point ICP, the route may pass through some network elements of an IMS network, a may not pass through them, depending on the particular variant embodiment of the invention;

step 503: the point ICP queries the gateway AGW address allocation of the resource through an interface S416, for example, point ICP sends an allocation request, which contains information about the address In the transfer;

step 504: gateway AGW allocates port resources Cyr, with the port F is used for receiving media data sent by the remote site, and for the coordination of the received media data with the address information In the transmission, all of the media data received by the port F must be redirected to the address In the transfer, and the port C is used for forwarding the media data received by the port F; then the gateway AGW through an interface S416 sends to the point ICP confirmation message selection, for example, the response message on the allocation, which contains information about the port F; in order to simplify explanation the address information per the villas, the corresponding port F, which includes information about the IP address and port, also denoted as F;

if the connection that wants to install the terminal UE-1, includes several display data, the information will contain information about multiple address transmission for receiving media data; in step 503 may be a single message with information about the different locations of the transmission for receiving media data, or several messages, each of which contains information about the address of the transmission to only accept one type of media data; similarly, at step 504 may have one message with multiple ports or multiple messages, each of which contains information about only one port; the specific method of implementation does not affect the essence of the present invention;

step 505: the point ICP replaces the address In the transmission of the connection request IMS, which is described in step 502, the address F transmission, and then transmits the connection request IMS remote site;

step 506: after receiving the connection request IMS remote site sends a response message of the IMS, for example, a 200 OK message, which contains information about the address transmission (denoted by X) a remote site for receiving the media data;

step 507: after receiving the response message IMS point ICP queries the gateway AGW address allocation of the resource through an interface S416, for example, the point ICP sends an allocation request, which contains information about the address X of the transmission;

step 508: the gateway AGW allocates port resources D and E, and the port D is used for receiving media data sent by the terminal UE-1, and for matching the received media data with information about the address X of the transfer, all of the media data received by the port D should be forwarded to the address X of the transmission, and port E is used for forwarding the media data received by the port D; then the gateway AGW through an interface S416 sends to the point ICP confirmation message selection, for example, the response message on the allocation, which contains information about the port D; in order to simplify the explanation of the address information transmission, the corresponding port D, also denoted as D;

if X contains information about multiple address transmission for receiving media data, then in step 507 may have one message with information about the different locations of the transmission for receiving media data, or several messages, each of which contains information about the address of the transmission to only accept one type of media data; similarly, at step 508 may be a single message with multiple ports or multiple messages, each of which contains information about only one port; it is skretny method of implementation does not affect the essence of the present invention;

steps 509-510: point ICP replaces the address X of the transmission response message of the IMS, which is described in step 506, the address D of the transmission, and then transmits the response message of the IMS terminal UE-1; the message may pass through some network elements of the IMS, and may not pass through them, depending on the particular variant of the invention, but in any case takes place via the control network element of the PS network, since this message is sent on the data channel IP, which is the managing network element of the PS network, with the transfer to the terminal UE-1;

thus, between the terminal UE-1 and remote site is set to display IMS connection, which consists of IMS media connection 1 (IMS-media 1) between the terminal UE-1 and the gateway AGW and IMS media connection 2 (IMS media 2) between the gateway AGW and the remote site;

below is a step-by-step description cross-domain switching terminal UE-1:

steps 511-517: steps similar to the steps 301-307 of Figure 3;

step 518: after receiving the control network element of the PS network request message to the switching center eMSC sends the point ICP connection request; this request is sent through the signal channel S414 and may be an INVITE message of the SIP message or IAM subsystem ISUP; the connection request contains the number information of the terminal UE-1, which will ustupaet as information about the caller, and number or identification information point ICP, which serves as information about the callee object;

step 518 and the steps below follow step 513 and are not a continuation of the steps 514-517;

step 519: point ICP determines that the connection request in step 518, represents a request for switching the session (the purpose of the connection number or the identification information of the point ICP, which can be coordinated with the session from step 502 with information about the caller of this compound), which is described in step 502, after which point ICP queries the gateway AGW operation mapping to connect the newly established media connections with previous IMS media connection 2, in this particular mode of implementation varies depending on the architecture;

step 520: when the operation is complete mapping point ICP sends the centre eMSC through the signaling channel 8414 response, with the final message received by the center eMSC may represent, for example, a 200 OK message to the SIP Protocol or the response message ANM subsystem ISUP, depending on connections.

thus, between the center of eMSC and the gateway AGW installed a new media channel, while the centre eMSC connects new media channel media channel CS, and the gateway AGW connects new media channel to display the IMS connection 2, to the terminal UE-1 can continue to communicate with the terminal UE-2.

In one of the embodiments of the present invention, the controller (as it is described in this invention, the point ICP) to support the SRVCC system consists of interconnected host module and a matching module, with:

a receiving module configured to receive a connection request from the centre of eMSC and to inform the matching module; and

a matching module configured to control the gateway AGW to negotiate formed by the connection request display line to a remote site media line IMS session according to the received connection request after the terminal UE-1 will establish an IMS session with a remote site via the PS network, the IMS session signalling part is bound to the controller, and the display part is bound to the gateway AGW, which is controlled by the controller.

If the connection request sent by the center eMSC is a message requesting connection of the SIP Protocol, this message contains the address of the N transmission, which again highlighted the center of eMSC for receiving media data in the newly installed display line; a matching module is additionally configured to reconcile the Adra is and N transfer from the external host address F remote site media line and then through the message of the SIP response to send to the center eMSC address J of the transmission for receiving media data sent by the center of eMSC in the newly established media line.

If the connection request sent by the center eMSC, represents an initial address message IAM Protocol subsystem user's digital network integrated services (ISDN ISUP), the message contains the number of the lines L1 resource recently installed media line that the final device eMSC uses to transmit display data CS; a matching module is additionally configured to return the center of the eMSC answer message ANM subsystem ISUP containing the line number L2 resource recently installed media line, which is used to transmit display data CS between the end device eMSC and the remote site.

In order to simplify the explanation information about the interfaces interface-related S410, in subsequent versions of the implementation of the present invention is not shown in the figures and is not explained; it does not affect the completeness of the description of the present invention, since the interface is S410 is a connection based on IP and IMS network and the extension of the present invention are entirely service-based network Protocol.

Option implementation architecture 1

Figure 6 shows the circuit 1 and hitecture 1 improved SRVCC in accordance with one embodiments of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description:

description of network elements:

standard elements SRVCC architecture: all network elements are similar to the corresponding elements of Figure 4;

point ICP: point ICP manages the gateway AGW for resource allocation, mapping and coordination of media channels; and

gateway AGW: gateway AGW performs the forwarding of IP media data or the sending of media data between the CS and IP;

description of related interfaces:

S602-S608: interfaces similar interfaces S402-S408 of Figure 4;

S612: the signal interface between IMS subscriber equipment UE and the point ICP for the transmission of signalling information between IMS UE and P-CSCF by using the point ICP, for example, Gm-interface standard IMS;

S614: the signal interface between the center of eMSC and point ICP to send the message while establishing the line between the center of eMSC and point ICP, for example, the standard Nc-interface; this interface may be an Nc-SIP interface based on the SIP Protocol or Nc-ISUP interface Protocol-based subsystem ISUP;

S616: the signal interface point between the ICP and the gateway AGW, by which point the ICP controls the gateway AGW for resource allocation and mapping or alignment is Oia media channels; and

S618: signal interface point between the ICP and the IMS network element to send the message to the IMS Protocol between UE and P-CSCF, for example, Gm-interface standard IMS.

Variant implementation of stream 1

Figure 7 shows the block diagram 1 (Nc SIP) improved SRVCC architecture-based 1 in accordance with the embodiment of the present invention, showing the process of the establishment of the IMS session between the terminal UE-1 and UE-2 and the subsequent establishment of the media connection terminal UE-1 through CS domain with the support of the terminal UE-1 and the network, while the continuity of the previous session is stored once for the terminal UE-1 is used SRVCC, while between the center of eMSC and point ICP interface Nc-SIP. The process consists of the following steps:

step 701: a step similar to steps 501-510 from Figure 5, the IMS message is transmitted between the subscriber equipment UE and the point ICP so as not to pass through a standard network elements of the IMS, and between the terminal UE-1 and remote site is set to display IMS connection, which consists of IMS media connection 1 between the terminal UE-1 and the gateway AGW and IMS media connection 2 between the gateway AGW and the remote site;

step 702: the step is similar to steps 511-517 of Figure 5;

step 703: after receiving the control network element of the PS network request message switched on the e center eMSC sends the point ICP connection request signal through the channel S614; in this embodiment of the invention the interface S614 denotes an interface Nc-SIP, therefore a sent message is an INVITE message of the SIP Protocol; the connection request contains the number information of the terminal UE-1, and numbering or identification information point ICP, with numbering or identification information point ICP acts as information about the callee object, and number information of the UE-1 acts as information about the caller, and in addition the message contains the address of the N transfer center eMSC for receiving display data;

step 703 may be performed prior to the completion of step 702 and described in detail in the explanation of step 518;

step 704: the point ICP determines that the connection request in step 703, represents a request for switching the session from step 701, then queries the gateway AGW perform mapping operations, for example, point ICP sends a request message mapping that contains the address of N transfer center eMSC and address F transfer previous IMS media connection 2, or address D transfer previous IMS media connection 1;

step 705: the gateway AGW performs the matching operation for the connection of a new media connection with the previous IMS media connection 2, and allocates a new port J for receiving the display data of the local area; to facilitate pojasne is the second address information transmission, the corresponding port J, also denoted as J; when the operation is complete mapping gateway AGW sends through an interface S616 point ICP response message about the mapping that contains the address J of the transmission gateway AGW for receiving display data;

step 706: after receiving the reply of the mapping point by ICP interface S614 sends the centre eMSC response message Nc-SIP, for example, a 200 OK message, which contains information gateway AGW on the received media resource;

thus, between the center of eMSC and the gateway AGW installed a new media channel, while the centre eMSC connects new media channel media channel CS, and the gateway AGW connects new media channel with IMS media connection 2 to the terminal UE-1 can continue to communicate with the terminal UE-2.

Option implementation flow 2

On Fig shows the block diagram 2 (Nc-ISUP) improved SRVCC architecture-based 1 in accordance with the embodiment of the present invention, showing the process of the establishment of the IMS session between the terminal UE-1 and UE-2 and the subsequent establishment of the media connection terminal UE-1 through CS domain with the support of the terminal UE-1 and the network, while the continuity of the previous session is stored once for the terminal UE-1 is used SRVCC, and between the center of eMSC and point ICP interface Nc-ISUP. About the ECC consists of the following steps:

steps 801-802: steps similar to the steps 701-702 of Fig.7;

step 803: after receiving the control network element of the PS network request message to the switching center eMSC sends the point ICP connection request signal through the channel S614, in this embodiment of the invention the interface S614 denotes an interface Nc-ISUP, therefore a sent message is an IAM message Protocol subsystem ISUP, which contains the line number L1 of the eMSC resource for transmitting display data CS; the connection request contains the number information of the terminal UE-1 and the number of information points ICP, while the number of information points ICP acts as information about the callee object, and number information UE-1 acts as information about the caller;

step 803 may be performed prior to the completion of step 802 and described in detail in the explanation of step 518;

step 804: the point ICP determines that the connection request in step 803, represents a request for switching the session from step 801, and then may request the gateway AGW operation selection line, for example, point ICP sends through an interface S616 request message highlight the line containing the received line number L1;

step 805: after receiving the allocation request line gateway AGW performs resource allocation lines for transmitting display data C which corresponds to the number of line L2, and then sends the point ICP through an interface S616 response on the selection line, for example, the response message on the allocation of the line that contains the number of the selected line L2;

step 806: the point ICP queries the gateway AGW perform mapping operations, for example, point ICP sends a request message mapping that contains the obtained line number L1 and may contain the obtained line number L2, if you followed the steps 804-805, and contains the address of the F transfer previous IMS media connection 2 or address D transfer previous IMS media connection 1;

step 807: the gateway AGW performs the matching operation for the connection of a new media connection with the previous IMS media connection 2; if steps 804-805 not been executed, the gateway AGW allocates a new line resource for transmitting display data CS, and the information about the line number is stored as part of the operation mapping, and the corresponding line number is denoted as L2; if steps 804-805 have already been performed, then the linear resource has already been allocated, and the gateway AGW through an interface S616 sends the point ICP response message mapping, which may not contain information on the number line if you have already performed the steps 804-805, or may contain information about the new dedicated line number L2, if steps 804-805 have not yet been performed

step 808: after receiving the reply of the mapping point by ICP interface S614 sends the centre eMSC response message Nc-ISUP, for example, the ANM message, which contains information gateway AGW on these lines for transmitting display data CS;

thus, between the center of eMSC and the gateway AGW installed a new media channel CS, while the centre eMSC connects new media channel media channel CS between subscriber equipment UE and the center of the eMSC, and the gateway AGW connects new media channel with CS IMS media connection 2 to the terminal UE-1 can continue to communicate with the terminal UE-2.

Option implementation architecture 2

Figure 9 shows a diagram of the architecture based on the architecture 1, at which point the ICP and the gateway PGW or the GGSN integrated, in accordance with the embodiment of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description:

description of network elements:

standard elements SRVCC architecture: all network elements, with the exception of the control network element of the PS network, similar to the corresponding elements of Figure 4;

gateway PGW or the GGSN network element for managing a network element of the PS network with connection to the Internet, related to managing the network element of the PS network; the network element is a gateway interaction with packet-switched networks or gateway GPRS support node and complemented the function of the control point for IMS management gateway AGW for resource allocation, matching, or matching media channels; the network element communicates between the control network element of the PS network and the IP network;

gateway AGW: access gateway for the implementation of forwarding IP media data or the sending of media data between the CS and IP;

description of related interfaces:

S902-S908: interfaces similar interfaces S402-S408 of Figure 4;

S912: a signaling interface between IMS subscriber equipment UE and the gateway PGW or the GGSN to send IMS signalling information between UE and P-CSCF using the gateway PGW or the GGSN, for example, Gm-interface standard IMS;

S914: a signaling interface between the center of eMSC and the gateway PGW or the GGSN to send the message while establishing the line between the center of the eMSC and the gateway PGW or the GGSN, for example, the standard Nc-based interface SIP (Nc-SIP interface) or standard Nc-based interface Protocol subsystem ISUP (Nc-ISUP);

S916: a signaling interface between the gateway PGW or the GGSN and the gateway AGW, by which the gateway PGW or the GGSN manages the gateway AGW for resource allocation and matching or coordination of media channels; and

S918: signal interface the with between the gateway PGW or the GGSN and IMS network element to send the message to the IMS Protocol between UE and P-CSCF via gateway PGW or the GGSN, for example, Gm-interface standard IMS;

embodiments of the flow on the basis of this architecture is almost identical versions of 7 and Fig except that point ICP from Fig.7 and Fig replaced by the gateway PGW or the GGSN, therefore, repeated description is not given here.

Option implementation architecture 3

Figure 10 shows a diagram of the architecture based on the architecture 1, at which point the ICP and the center eMSC integrated, in accordance with the embodiment of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description:

description of network elements:

standard elements SRVCC architecture: all network elements, except for the center eMSC, similar to the corresponding network elements of Figure 4;

eMSC: improved center mobile switching for query processing on the switch sent to the managing network element of the PS network, the implementation of cross-domain transition for the session and perform the matching operation switch CS operation cross transition, while the centre eMSC complemented the function of the control point for IMS management gateway AGW for resource allocation, matching, or matching media channels;

gateway AGW: the gateway on the stupa for the implementation of forwarding the media data between the CS and IP;

description of related interfaces:

S1002-S1008: interfaces similar interfaces S402-S408 of Figure 4;

S1012: a signaling interface between IMS subscriber equipment UE and the center of eMSC for the transmission of signalling information between IMS UE and P-CSCF by using Central eMSC, for example, Gm-interface standard IMS;

S1016: a signaling interface between the center of eMSC and the gateway AGW, through which the center eMSC manages the gateway AGW for resource allocation and matching or coordination of media channels; and

S1018: a signaling interface between the center of eMSC and IMS network element to send the message to the IMS Protocol between UE and P-CSCF by using Central eMSC, for example, Gm-interface standard IMS.

Option implementation flow 3

Figure 11 shows the block diagram of the improved SRVCC based on Figure 10 in accordance with the embodiment of the present invention, showing the process of the establishment of the IMS session between the terminal UE-1 and UE-2 and the subsequent establishment of the media connection terminal UE-1 through CS domain with the support of the terminal UE-1 and the network, while the continuity of the previous session is stored once for the terminal UE-1 is used SRVCC; and the target cell that switches the terminal UE-1, is under the control of another centre MSC (not center eMSC). The process consists of the following steps:

Sha is 1101: the terminal UE-1 initiates the connection request IMS, for example, by sending an INVITE message according to the data transmission channel IP, which is the managing network element of the PS network; the connection request contains information about the address of the transmission terminal UE-1 to receive media data, which is denoted by the symbol; then the connection request is transferred to the center of the eMSC, the route does not affect the network elements of the IMS network;

step 1102: the center eMSC asks gateway AGW address allocation of the resource through an interface S1016, for example, by sending an allocation request, which contains information about the address In the transfer;

step 1103: the gateway AGW allocates port resources and F, with the F port is used for receiving media data sent by the remote site, and to perform coordination, in which all the display data received by the port F, will be forwarded to the address In the transfer, and the port C is used for forwarding the media data received by the port F; then the gateway AGW through an interface S1016 sends the centre eMSC confirmation message selection, for example, the response message on the allocation, which contains information about the port F; in order to simplify the explanation of the address information transmission corresponding port F, which includes information about the IP address and port, also denoted as F;

if the connection that wants the mouth of the o be catching the terminal UE-1, includes several display data, the information will contain information about multiple address transmission for receiving media data; in step 1102 may have one message with information about the different locations of the transmission for receiving media data, or several messages, each of which contains information about the address of the transmission to only accept one type of media data; similarly, at step 1103 may be a single message with multiple ports or multiple messages, each of which contains information about only one port; the specific method of implementation does not affect the essence of the present invention;

step 1104: the center eMSC replaces the address In the transfer from step 1101 to the address F transmission, and then forwards the message to the connection request IMS;

step 1105: after a message is received with the connection request IMS remote site sends a response message of the IMS, for example, a 200 OK message, which contains information about the address transmission (denoted by X) a remote site for receiving the media data;

step 1106: after receiving the response message IMS center eMSC asks gateway AGW address allocation of the resource through an interface S1016, for example, by sending an allocation request, which contains information about the address X of the transmission;

step 1107: the gateway AGW plot of the em port resources D and E, the port D is used for receiving media data sent by the terminal UE-1, and to perform coordination, in which all the display data received by the port D will be redirected to the address X of the transmission, and port E is used for forwarding the media data received by the port D; then the gateway AGW through an interface S1016 sends the centre eMSC confirmation message selection, for example, the response message on the allocation, which contains information about the port D; in order to simplify the explanation of the address information transmission, the corresponding port D, also denoted as D;

if X contains information about multiple address transmission for receiving media data, then in step 1106 may have a single message with information about the different locations of the transmission for receiving media data, or several messages, each of which contains information about the address of the transmission to only accept one type of media data; similarly, at step 1107 may be a single message with multiple ports or multiple messages, each of which contains information about only one port; the specific method of implementation does not affect the essence of the present invention;

step 1108: the center eMSC replaces the address X of the transmission, which is described in step 1105, the address D of the transmission, then Perez who barks the response message of the IMS;

the route does not affect the network elements of the IMS and is transmitted through a data transmission channel IP, which is the managing network element of the PS network for transmission to the terminal UE;

thus, between the terminal UE-1 and remote site is set to display IMS connection, which consists of IMS media connection 1 between the terminal UE-1 and the gateway AGW and IMS media connection 2 between the gateway AGW and the remote site;

below is the description cross-domain switching terminal UE-1:

steps 1109-1111: steps similar to the steps 511-513 of Figure 5;

step 1112: the center eMSC prepares resource display line to the target network CS in accordance with the standard flow switch CS; as the target cell belongs to another centre MSC (not to the center of the eMSC), the center of the eMSC sends the target centre MSC switch request, for example, in the form of a request message for switching;

step 1113: target center MSC returns a response message to the switch, which contains the number of interoffice switching;

step 1114: center eMSC asks gateway AGW selection line resource for transmitting display data CS through an interface S1016, for example, by sending an allocation request line;

step 1115: gateway AGW receives the allocation request line resource, allocates linear resource for transmitting display data CS, and then in the response message the attachment sends the centre eMSC room dedicated line L1, for example, by sending a response message on the selection line, which contains information about the line number L1;

step 1116: center eMSC sends the target centre MSC establishment request line, for example, by sending the IAM message, which contains information about the number of received lines L1;

step 1117: target center MSC prepares for the terminal UE-1, the radio resource according to a standard process interoffice switching CS;

step 1118: target center MSC returns a response about the establishment of a line, for example, by sending messages ANM, which contains information about the line number L2 line resource for transmission of media data between the target CS center MSC and the center eMSC;

step 1119: center eMSC asks gateway AGW perform mapping operations, for example, by sending a request message mapping that contains the obtained line number L1 or L2, as well as address F transfer previous IMS media connection 2 and the address D of the transmission of the previous IMS media connection 1;

step 1120: gateway AGW performs the matching operation for the connection of a new media connection with the previous IMS media connection 2 and sends the centre eMSC response message mapping through an interface S1016 (for example);

step 1121: center eMSC receives a response about the mapping and interface S1008 sends the previous is the managing network element of the PS network response message switching;

step 1122: after receiving the response message on the switch managing the network element of the PS network through an interface S1004 sends to the terminal UE-1 command message about switching to notify the terminal UE-1 implementation of the switch in the CS domain; and

step 1123: after receiving the command message about switching the terminal UE-1 changes its mode of access to the access mode for the CS domain;

thus, between the terminal UE-1 and the gateway AGW installed a new media channel CS, which consists of a media connection between CS terminal UE-1 and the CS network, the media connection CS between the CS network and the target center MSC and the media connection between the target CS center MSC and gateway AGW; the gateway AGW connects new media channel CS with previous IMS media connection 2 to the terminal UE-1 can continue to communicate with the terminal UE-2.

Option implementation architecture 4

On Fig is a diagram of the architecture based on the architecture 1, at which point the ICP and the gateway AGW is integrated, in accordance with the embodiment of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description:

description of network elements:

standard elements SRVCC architecture: all network items the options are similar to the corresponding elements of Figure 4; and

point IACP: function access point and control IMS (IACP) for the implementation of resource allocation, matching, or matching media channels, forwarding media data IP or transferring media data between the CS and IP;

description of related interfaces:

S1202-S1208: interfaces similar interfaces S402-S408 of Figure 4;

S1212: a signaling interface between IMS subscriber equipment UE and the point IACP for the transmission of signalling information between IMS UE and P-CSCF by using the point IACP, for example, Gm-interface standard IMS;

S1214: a signaling interface between the center of eMSC and point IACP to send the message while establishing the line between the center of eMSC and point IACP, for example, the standard MS interface, which can be an Nc-SIP interface based on the SIP Protocol or Nc-ISUP interface Protocol-based subsystem ISUP; and

S1218: signal interface point between the IACP and IMS network element to send the message to the IMS Protocol between UE and P-CSCF by using the point IACP, for example, Gm-interface standard IMS.

Embodiments of the flow on the basis of this architecture is almost identical versions of 7 and Fig except that the ICP and the gateway AGW from Fig.7 and Fig integrated into the point of the IACP, resulting in the message flow between the point ICP and the gateway AGW becomes an internal process;

therefore, the Torno description is not given here.

Option implementation architecture 5

On Fig is a diagram of the architecture based on the architecture 1, at which point the ICP, the gateway AGW and the gateway PGW or the GGSN integrated, in accordance with the embodiment of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description of the network elements and interfaces:

description of network elements:

standard elements SRVCC architecture: all network elements are similar to the corresponding elements of Figure 4;

gateway PGW or the GGSN network element for managing a network element of the PS network with connection to the Internet, related to the control network element of the PS network; the network element is a gateway interaction with packet-switched networks or gateway GPRS support node and communicates between the control network element of the PS network and the IP network; this element is complemented by a feature point of access and control IMS (IACP) for the implementation of resource allocation, matching, or matching media channels and forwarding media data IP or transferring media data between the CS and IP;

description of related interfaces:

S1302-S1308: interfaces similar interfaces S402-S408 of Figure 4;

S1312: signal inter is as between IMS subscriber equipment UE and the gateway PGW or the GGSN to send IMS signalling information between UE and P-CSCF using the gateway PGW or the GGSN, for example, Gm-interface standard IMS;

S1314: a signaling interface between the center of eMSC and the gateway PGW or the GGSN to send the message while establishing the line between the center of the eMSC and the gateway PGW or the GGSN, for example, the standard Nc-interface, which can be an Nc-SIP interface based on the SIP Protocol or Nc-ISUP interface Protocol-based subsystem ISUP;

S1318: a signaling interface between the gateway PGW or the GGSN and IMS network element to send the message to the IMS Protocol between UE and P-CSCF via gateway PGW or the GGSN, for example, Gm-interface standard IMS.

Embodiments of the flow on the basis of this architecture is almost identical versions of 7 and Fig except that the point ICP from Fig.7 and Fig replaced by the gateway PGW or the GGSN, integrated with the gateway AGW, resulting in the flow of messages between the gateway PGW or the GGSN and the gateway AGW becomes an internal process; therefore, repeated description is not given here.

Option implementation architecture 6

On Fig is a diagram of the architecture 2 improved SRVCC in accordance with one embodiments of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description of the network elements and interfaces:

opisaniyeya elements:

standard elements SRVCC architecture: all network elements are similar to the corresponding elements of Figure 4;

point ICP: checkpoint IMS (ICP) for the management gateway AGW with the purpose of resource allocation and matching or coordination of media channels; and

gateway AGW: access gateway for the implementation of forwarding IP media data or the sending of media data between the CS and IP;

description of related interfaces:

S1402-S1408: interfaces similar interfaces S402-S408 of Figure 4;

S1412: a signaling interface between IMS subscriber equipment UE and P-CSCF for the transmission of signalling information between IMS UE and the function P-CSCF, for example, Gm-interface standard IMS;

S1414: a signaling interface between the center of eMSC and point ICP to send the message while establishing the line between the center of eMSC and point ICP, for example, the standard MS interface, which can be an Nc-SIP interface based on the SIP Protocol or Nc-ISUP interface Protocol-based subsystem ISUP;

S1416: signal interface point between the ICP and the gateway AGW, by which point the ICP controls the gateway AGW for resource allocation and matching or coordination of media channels;

S1418: a signaling interface between IMS point ICP and function I-CSCF or S-CSCF to send the message Protocol between IMS P-CSCF and I-CSCF or S-CSCF through the point ICP, is for example, Mw-interface standard IMS; and

S1420: signal interface point between the ICP and the function P-CSCF to send the message Protocol between IMS P-CSCF and I-CSCF or S-CSCF through the point ICP, for example, Mw-interface standard IMS.

Interfaces S1418 and S1420 together constitute the interface S418 of Figure 4.

Option implementation flow 4

On Fig shows the block diagram (Nc SIP) improved SRVCC architecture-based 2 in accordance with the embodiment of the present invention, showing the process of the establishment of the IMS session between the terminal UE-1 and UE-2 and the subsequent establishment of the media connection terminal UE-1 through CS domain with the support of the terminal UE-1 and the network, while the continuity of the previous session is stored once for the terminal UE-1 is used SRVCC, while between the center of eMSC and point ICP interface Nc-SIP. The process consists of the following steps:

step 1501: the step is similar to steps 501-510 of Figure 5 except that the IMS message transmitted between the subscriber equipment UE and the point ICP, passes through the network element P-CSCF IMS; between the terminal UE-1 and remote site is set to display IMS connection, which consists of IMS media connection 1 between the terminal UE-1 and the gateway AGW and IMS media connection 2 between the gateway AGW and the remote site;

step 1502: step Ana is Ogien steps 511-517 of Figure 5;

step 1503: after receiving the control network element of the PS network request message to the switching center eMSC sends the point ICP connection request signal through the channel S1414, in this embodiment of the invention the interface S1414 denotes an interface Nc-SIP, therefore a sent message is an INVITE message of the SIP Protocol; the connection request contains the number information of the terminal UE-1 and the number of information points ICP, while the number of information points ICP acts as information about the callee object, and number information of the UE-1 acts as information about the caller and the message contains Addre transfer center eMSC for receiving display data;

step 1503 may run to completion step 1502 and described in detail in the explanation of step 518;

step 1504: the point ICP determines that the connection request in step 1503, represents a request for switching the session from step 1501, and then queries the gateway AGW perform mapping operations, for example, by sending a request message mapping that contains the address of the N transfer center eMSC and address F transfer previous IMS media connection 2, or address D transfer previous IMS media connection 1;

step 1505: gateway AGW performs the matching operation for the connection of a new media connection is the link with the previous IMS media connection 2, and allocates a new port J for receiving the display data of the local area; in order to simplify the explanation of the address information transmission, the corresponding port J, also denoted as J; when the operation is complete mapping gateway AGW sends through an interface S1416 point ICP response message about the mapping that contains the address J of the transmission gateway AGW for receiving display data;

step 1506: after receiving the reply of the mapping point by ICP interface S1414 sends the centre eMSC response message Nc-SIP, for example, a 200 OK message, the response message contains information gateway AGW on the received media resource;

thus, between the center of eMSC and the gateway AGW installed a new media channel IMS, the center eMSC connects new media channel media channel CS, and the gateway AGW connects new media channel with IMS media connection 2 to the terminal UE-1 can continue to communicate with the terminal UE-2.

In the embodiment, the flow on the basis of this architecture using Nc-ISUP interface between the center of eMSC and point ICP process of establishing the IMS session is identical to the corresponding process from step 1501 on Fig, and the switching process is identical to the process of Fig, therefore, repeated description is not given here.

Option implementation architecture 7

On Fig the scheme architect the market on the basis of grade 2, at which point the ICP and function P-CSCF integrated, in accordance with the embodiment of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description of the network elements and interfaces:

description of network elements:

standard elements SRVCC architecture: all network elements are similar to the corresponding elements of Figure 4;

function P-CSCF: proxy CSCF (P-CSCF), supplemented by the binding function of the signal channel based on the standard function P-CSCF; and

gateway AGW: access gateway for binding media channels;

description of related interfaces:

S1602-S1608: interfaces similar interfaces S402-S408 of Figure 4;

since the function P-CSCF is the IMS network element, the signal interface between the UE and the IMS network is a standard interface IMS, so it is not shown here and are not described;

S1614: a signaling interface between the center of eMSC and function P-CSCF to send the message while establishing the line between the center of eMSC and function P-CSCF, for example, the standard MS interface, which can be an Nc-SIP interface based on the SIP Protocol or Nc-ISUP interface Protocol-based subsystem ISUP; and

S1616: a signaling interface between the P-CSCF and the gateway AW, whereby the function P-CSCF controls the gateway AGW for resource allocation and mapping or matching media channels.

Option implementation flow on the basis of this architecture is almost identical version of Fig except that the ICP and function P-CSCF from Fig integrated, therefore, repeated description is not given here.

Option implementation architecture 8

On Fig is a diagram of the architecture-based architecture 2, at which point the ICP and the center eMSC integrated, in accordance with the embodiment of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description of the network elements and interfaces:

description of network elements:

standard elements SRVCC architecture: all network elements, except for the center eMSC, similar to the corresponding network elements of Figure 4;

eMSC: improved center mobile switching for query processing on the switch sent to the managing network element of the PS network, the implementation of cross-domain transition for the session and perform the matching operation switch CS operation cross transition, while the centre eMSC supplemented function checkpoint IMS (ICP) DL the management gateway AGW for the purposes of resource allocation matching or coordination of media channels;

gateway AGW: access gateway to perform forwarding media data between the CS and IP;

description of related interfaces:

S1702-1708: interfaces similar interfaces S402-S408 of Figure 4;

S1712: a signaling interface between IMS subscriber equipment UE and P-CSCF to send IMS signalling information between UE and P-CSCF, for example, Gm-interface standard IMS;

S1716: a signaling interface between the center of eMSC and the gateway AGW, through which the center eMSC manages the gateway AGW for resource allocation and matching or coordination of media channels;

S1718: a signaling interface between IMS center eMSC and function I-CSCF or S-CSCF to send the message Protocol between IMS P-CSCF and I-CSCF or S-CSCF through the center of eMSC, for example, Mw-interface standard IMS;

S1720: a signaling interface between the center of eMSC and function P-CSCF to send the message Protocol between IMS P-CSCF and I-CSCF or S-CSCF through the center of eMSC, for example, Mw-interface standard IMS.

Interfaces S1718 and S1720 together constitute the interface S418 of Figure 4.

Variant implementation of stream 5

On Fig depicts a block diagram of the improved SRVCC based Pig in accordance with the embodiment of the present invention, showing the process of establishing a session between IMS terminal is mi UE-1 and UE-2, as well as the subsequent establishment of the media connection terminal UE-1 through CS domain with the support of the terminal UE-1 and the network, while the continuity of the previous session is stored once for the terminal UE-1 is used SRVCC; a target cell, which switches the terminal UE-1 is running Central eMSC; the process consists of the following steps:

step 1801: the terminal UE-1 initiates the connection request IMS, for example, by sending an INVITE message according to the data transmission channel IP, which is the managing network element of the PS network; the connection request contains information about the address of the transmission terminal UE-1 to receive media data, which is denoted by the symbol; then the connection request is transferred to the P-CSCF;

step 1802: P-CSCF forwards the connection request to the center eMSC;

steps 1803-1808: steps similar to the steps 1102-1107 of 11;

step 1809: center eMSC replaces the address X transfer from step 1806 to the address D of the transmission, and then forwards the request message to the IMS connection; this message passes through the P-CSCF;

step 1810: P-CSCF forwards the response message of the IMS subscriber equipment UE, with the forwarded message is transmitted on the data channel IP, which is the managing network element of the PS network;

thus, between the terminal UE-1 and remote site is set Edine connection IMS, which consists of IMS media connection 1 between the terminal UE-1 and the gateway AGW and IMS media connection 2 between the gateway AGW and the remote site;

below is the description cross-domain switching terminal UE-1:

steps 1811-1814: steps identical to the steps 511-514 of Figure 5, with prepared media resource CS corresponds to the line number L1 gateway AGW;

steps 1815-1818: steps similar to the steps 804-807 of Fig;

step 1819: center eMSC receives a response about the mapping and interface S1708 sends the previous Manager network element of the PS network response message switching;

step 1820: after receiving the response message on the switch managing the network element of the PS network through an interface S1704 sends to the terminal UE-1 command message about switching to notify the terminal UE-1 implementation of the switch in the CS domain; and

step 1821: after receiving the command message about switching the terminal UE-1 changes its mode of access to the access mode for the CS domain;

thus, between the terminal UE-1 and the gateway AGW is installed media channel CS, which consists of a media connection between CS terminal UE-1 and the CS network and media CS connection between the CS network and the gateway AGW; the gateway AGW connects new media channel CS with previous IMS media connection 2 to the terminal UE-1 can continue to communicate with the terminal UE-2.

On Fig is a diagram of the architecture-based architecture 2, at which point the ICP and the server SC AS integrated, in accordance with the embodiment of the present invention; the figure shows the network elements (network elements)that are used to implement the improved SRVCC, as well as the interfaces and links between them; the following is a detailed description of the network elements and interfaces:

description of network elements:

standard elements SRVCC architecture: all network elements are similar to the corresponding elements of Figure 4;

server SC AS function application server service continuity (SC AS) in the IMS, which is complemented by function management gateway AGW for the implementation of resource allocation and matching or coordination of media channels; and

gateway AGW: access gateway to perform forwarding media data IP;

description of related interfaces:

S1902-S1908: interfaces similar interfaces S402-S408 of Figure 4;

because the server SC AS is a network element of the IMS signaling interface between the UE and the IMS network is a standard interface IMS, so it is not shown here and are not described;

S1914: similar interface S414 of Figure 4;

S1916: a signaling interface between the server SC and AS a gateway AGW, through which the server SC AS controls or the zoom AGW for resource allocation and matching or coordination of media channels; and

S1918: a signaling interface between IMS server SC AS a function of the CSCF, which is a standard interface ISC IMS.

Option implementation flow 6

On Fig depicts a block diagram of the improved SRVCC based Pig in accordance with the embodiment of the present invention, showing the process of the establishment of the IMS session between the terminal UE-1 and LIE-2, as well as the subsequent establishment of the media connection terminal UE-1 through CS domain with the support of the terminal UE-1 and the network, while the continuity of the previous session is stored once for the terminal UE-1 is used SRVCC. To simplify the description of the server AS and SC function CSCF depicted as a single block. The process consists of the following steps:

step 2001: a step similar to steps 501-510 from Figure 5, except that the IMS message transmitted between the subscriber equipment UE and the server SC AS through all network elements CSCF of the IMS in accordance with the standard process; between the terminal UE-1 and remote site is set to display IMS connection, which consists of IMS media connection 1 between the terminal UE-1 and the gateway AGW and IMS media connection 2 between the gateway AGW and the remote site;

step 2002: the step is similar to steps 511-517 of Figure 5;

step 2003: after receiving the control network element of the PS network message is a request for switching centre eMSC sends to the server SC AS the connection request signal through the channel S1914; in this embodiment of the invention the interface S1914 denotes an interface 12 IMS, and the outgoing message is an INVITE message of the SIP Protocol; the connection request contains the number information of the terminal UE-1 and number information server SC AS, while number information of the terminal UE-1 acts as information about the caller and number information server SC AS acts as information about the callee object, and the message contains the address of the N transfer center eMSC for receiving display data;

step 2003 can run to completion step 2002 and is described in detail in the explanation of step 518;

step 2004: server SC AS determines that the connection request in step 2003, represents a request for switching the session from step 2001, and then queries the gateway AGW perform mapping operations, for example, by sending a request message mapping that contains the address of the N transfer center eMSC and address F transfer previous IMS media connection 2, or address D transfer previous IMS media connection 1;

step 2005: gateway AGW performs the matching operation for the connection of a new media connection with the previous IMS media connection 2, and allocates a new port J for receiving the display data of the local area; in order to simplify the explanation of the address information transmission and, the corresponding port J, also denoted as J; when the operation is complete mapping gateway AGW sends through an interface S1916 server SC AS response message on the mapping that contains the address J of the transmission gateway AGW for receiving display data; and

step 2006: after receiving the reply of the mapping server SC AS through an interface S1914 sends the centre eMSC response message, for example, a 200 OK message, which contains information gateway AGW on the received media resource;

thus, between the center of eMSC and the gateway AGW installed a new media channel IMS, the center eMSC connects new media channel media channel CS, and the gateway AGW connects new media channel with IMS media connection 2 to the terminal UE-1 can continue to communicate with the terminal UE-2.

In this architecture, when used between the center of eMSC and server SC AS interface Nc-SIP steps 2003-2006 similar to the steps 703-706 of Fig.7; when using between the center of eMSC and server SC AS interface Nc-ISUP steps 2003-2006 similar to the steps 803-808 of Fig; if the center of the eMSC and the server SC AS connected through a network gateway, from the point of view of the server SC AS the flow remains the same except that a media connection between the center eMSC and the gateway AGW consists of a media connection between CS center eMSC and the network gateway and a media connection between IMS network is Luz and is easily accessible by and the gateway AGW; because the process is completely standard, repeated description is not given here.

Although the present invention is described with reference to specific embodiments of specialists in this area should be clear that it is possible to perform various modifications and variations within the scope of the present invention and that such modifications and variations will be within the scope of the present invention and appended claims.

INDUSTRIAL APPLICABILITY

The present invention offers a way to implement SRVCC and the SRVCC system, which can effectively reduce the duration of the interruption in comparison with the prior art and significantly improve the quality of work for the user.

List of abbreviations

3GPP is a partnership project third generation

AGW - access gateway

ANM - answer message

AS - application server

CS - switching channels

CSCF - session management feature

E - the interface - interoffice signaling interface

eMSC - superior center mobile switching

ICP - checkpoint IMS

I-CSCF - CSCF requesting

IMS Internet Protocol multimedia subsystem IP-based)

ISDN digital network integration service (services)

ISUP Protocol subsystem user's ISDN

lu-CS interface between the RNC and the base CE is d switching channels (CSCN)

MIU - site mobility management

Nc - interface - interoffice signaling interface

P-CSCF - proxy CSCF

PS - packet switched

SC AS - application server service continuity

S-CSCF - serving CSCF

SE - server hardware

SGSN - serving GPRS support node

The SIP Protocol session

SRVCC is a separate continuity of a voice call on the radio

UE - subscriber equipment

Um - interface air interface

Uu - interface - radio

1. The way to implement the separate continuity of a voice call on the radio interface (SRVCC) after the user equipment (UE-1) establishes with the remote site session in accordance with the architecture of the subsystem multimedia messaging based on the Internet Protocol (IMS) through a network of packet switching (PS), while in the IMS session signalling part is bound to the control point IMS (ICP), and the media is bound to the access gateway (AGW) running point ICP; the method consists in the following:
through the control network element of the PS network in the superior center mobile switching (eMSC) sends a request for switching the session on IMS access network circuit switching (CS);
after receiving the request for switching centre eMSC prepares resource display line is, to the terminal UE-1 can interact with the center eMSC, after which point the ICP sends a connection request; and
through point ICP is managed by the gateway AGW to negotiate media lines, which are formed by means of a connection request from the media line remote section of the IMS session.

2. The method according to claim 1, in which ship center eMSC connection request is a request message connection in accordance with the Protocol to establish a communication session (SIP)that contains the address of H transmission, which again highlighted the center of eMSC for receiving media data in the newly installed display line;
on the step, during which point ICP reconciliations of display lines formed by using a connection request from the media line remote section of the IMS session, you will do the following: after receiving the request message for the connection of SIP Protocol is negotiated, the address N of the transmission with the external host address F remote site media line through point ICP, then the center of the eMSC through the message of the SIP response is sent to the address J of the transmission for receiving media data sent by the center of eMSC in the newly established media line.

3. The method according to claim 2, in which
on the step, during which point ICP reconciliations of m is dinoi line, formed with a connection request from the media line remote section of the IMS session, you will do the following:
after receiving the request message for the connection of SIP Protocol on the access gateway AGW through point ICP sends a request to the mapping that contains the address H of the transmission; and
address H is passed through the gateway AGW is consistent with the remote site media line, and is the address J of the transmission, which is sent to the point by ICP response mappings.

4. The method according to claim 1, in which
sent by the center eMSC the connection request is an initial address message Protocol subsystem user ISDN - (ISUP), which contains the line number L1 resource recently installed media line that the final device eMSC uses to transmit display data CS; and
on the step, during which point ICP reconciliations of display lines formed by using a connection request from the media line remote section of the IMS session, you will do the following: after receiving the initial address message point ICP returns to the center of the eMSC answer message ANM subsystem ISUP, which contains the line number L2 resource recently installed media line used to transmit display data CS between the end device eMSC and the remote site.

5. JV the property according to claim 4, in which
on the step, during which point ICP reconciliations of display lines formed by using a connection request from the media line remote section of the IMS session, you will do the following:
after receiving the initial address message by point ICP gateway AGW sends a request to the mapping that contains the line number L1; and
after receiving the request for the mapping by gateway AGW line number L1 is consistent with the remote site media line will be the line number L2, which goes point by ICP response mappings.

6. System for the implementation of the separate continuity of a voice call on the radio interface (SRVCC), contains a control network element of the network is a packet switching (PS)network circuit switching (CS), improved center mobile switching (eMSC), the control point subsystem multimedia messaging based on the Internet Protocol (ICP) and the access gateway (AGW),
managing a network element of the PS network is configured to send the center eMSC switch request, which requests the switching of the IMS session in the access mode of the CS network, and the IMS session is a communication session established subscriber equipment UE-1 to a remote site through a network of PS, in which the signal part of privas is provided to the point of ICP, and the media is bound to the gateway AGW running point ICP;
center eMSC is configured so that upon receiving a request to switch to prepare the resource display line, which allows the terminal UE-1 to interact with the center eMSC, and then send the point ICP the connection request; and
point ICP is configured to control the gateway AGW to negotiate media lines, which are formed by means of a connection request from the media line remote section of the IMS session.

7. The system according to claim 6, in which
sent by the center eMSC connection request is a request message connection in accordance with the SIP Protocol, containing the address N of the transmission, which again highlighted the center of eMSC for receiving media data in the newly installed display line;
point ICP additionally configured to, after receiving the request message for connection SIP to reconcile the address N of the transmission with the external host address F remote site media line, and then through the message of the SIP response to send to the center eMSC address J of the transmission for receiving media data sent by the center of eMSC in the newly established media line.

8. The system according to claim 7, in which
point ICP additionally configured so that after receiving the message requesting connection SIP to send to the gateway AGW query on the mapping, contains the address N of the transmission; and
gateway AGW is configured to carry out the agreement addresses N transmission to a remote site media line, highlight the address J of the transmission and send it point by ICP response mappings.

9. The system according to claim 6, in which
sent by the center eMSC the connection request is an initial address message Protocol subsystem user ISDN - (ISUP), which contains the line number L1 resource recently installed media line that the final device eMSC uses to transmit display data CS; and
point ICP additionally configured so that after receiving the initial address message to return to the center of the eMSC answer message ANM subsystem ISUP containing the line number L2 resource recently installed media line, which is used to transfer media data between CS target device eMSC and the remote site.

10. The system according to claim 9, in which
point ICP additionally configured so that after receiving the initial address message to send to the gateway AGW query on the mapping that contains the line number L1; and
gateway AGW is configured so that upon receiving a request to map to carry out the agreement number line L1 with the remote site media line, highlight the line number L2 and traslate his point by ICP response mappings.

11. The controller for the system realization of the separate continuity of a voice call on the radio interface (SRVCC), which consists of interconnected host module and a matching module, with
a receiving module configured to receive a connection request from the centre of eMSC and to inform the matching module; and
a matching module configured to control the gateway AGW to negotiate formed by the connection request display line to a remote site media line IMS session according to the received connection request after the terminal UE-1 will establish an IMS session with a remote site via the PS network, the IMS session signalling part is bound to the controller, and the display part is bound to the gateway AGW, which is controlled by the controller.

12. The controller according to claim 11, in which
sent by the center eMSC connection request is a request message connection in accordance with the Protocol to establish a communication session (SIP)that contains the address of H transmission, which again highlighted the center of eMSC for receiving media data in the newly installed display line; and
the matching module is additionally configured to perform the agreement addresses H transfer from the external host address F in Lenogo plot display line, and then through the message of the SIP response to send to the center eMSC address J of the transmission for receiving media data sent by the center of eMSC in the newly established media line.

13. The controller according to claim 11, in which
sent by the center eMSC the connection request is an initial address message Protocol subsystem user ISDN - (ISUP), which contains the line number L1 resource recently installed media line that the final device eMSC uses to transmit display data CS; and
the matching module is additionally configured to return the center of the eMSC response message subsystem ISUP containing the line number L2 resource recently installed media line, which is used to transfer media data between CS target device eMSC and the remote site.