Method and system for advancing traffic streams with guaranteed quality of service using internet protocol

FIELD: systems and methods for advancing traffic streams with guaranteed quality of service in network.

SUBSTANCE: proposed method involves use of dispatch network resource managers to execute service function ensuring desired quality of service (QoS) similar to and separated from route choice function for IP bursts in Internet Protocol dispatch networks at transfer channel control level. Upon completion of route choice dispatch network resource managers control routers so as to enable traffic streams to run on the way assigned by resource manager in dispatch network with aid of multilayer label stack technology. Proposed system implements this method.

EFFECT: enhanced reliability of system.

14 cl, 12 dwg

 

The LEVEL of TECHNOLOGY

The present invention relates to techniques for building IP networks, in particular to a method of promoting traffic flows with guaranteed quality of service (QoS) in the IP network, and to a system for implementing this method.

BACKGROUND of the INVENTION

Currently, providers of telecommunication services IP networks can only provide information services. With the growing number of subscribers to broadband networks are also growing demands for quality of service in IP networks. For services performed in real time, such as audio and video conferencing, etc. demands for quality of service (QoS).

As shown in figure 1, all IP-network provider of telecommunications services consists of edge levels of access/edge layer) and the main level. Subscribers IP network can reach the border router E in various means of access, such as various types of digital subscriber line XDSL (x Digital Subscriber Line), combined optomistically cable HFC (hybrid fiber-coax)Ethernet network, via a dedicated (leased) line (lease line) or wireless local communication line WLL (Wireless Local Loop) and so on Border router E manages subscribers and is connected to the trunk RH router responsible for sending and tracing of IP packets. The IP network can be huge, for example, the na is other global provider of telecommunications services may include thousands and thousands of backbone and edge routers. From the point of view of facilities management and the stability of the network routes the IP network, as shown by the dotted lines in figure 1, can be divided into many sections with independent management routes. In General, the network consists of a large number of local networks and links between them. The network may be divided into areas on a regional basis, such as a city, province or state; or be based on other principles. Usually the providers of telecommunication services IP networks are divided along regional lines, with each local network can be a stand-alone IP system (IP Autonomous System (AS).

Due to the design concepts, in General, in the preceding IP networks do not have the means to guarantee QoS. To adapt the development of network applications with a variety of ways, providing QoS in IP networks, including the model of integrated care (Integrated Service (Int-Serv) and the model of differentiated service Differentiated Service - Diff-Serv). Moreover, the model of differentiated service Diff-Serv can be used to provide QoS in conjunction with the technology Multiprotocol switching using tags (Multi-Protocol Label Switching technology - MPLS). Currently, the combination of complex models of Int-Serv and differential Diff-Serv service is what I accepted way, moreover, the model of integrated service Int-Serv is used in access networks and border areas, and the model of differentiated service Diff-Serv is used in the backbone network. When used in the backbone network model of differentiated service Diff-Serv may use MPLS technology.

If it is a model of differentiated service Diff-Serv and quality of service (QoS) is guaranteed only set priority according to the type of service (Type of Service - ToS), the effect is unpredictable, though, and has the advantage due to the high load factor of the channel (high line utilization factor). Therefore, the proposed additional ways to improve the model of differentiated service Diff-Serv. Some organizations and manufacturers are introducing independent level control transport (independent bearer control layer) on the highway with a differentiated service (the backbone Diff-Serv) and establish a number of special signaling mechanisms to monitor quality differentiated service Diff-Serv QoS. Problem, the design team Internet by the IETF (Internet Engineering Task Force), together with some manufacturers and institutions to promote the application of differentiated service Diff-Serv implement an experimental network Qbone Internet 2 using to manage network resources and topology intermediary strip transport the project (Bandwidth Broker - CENTURIES). Some other manufacturers also offer ways of managing resources and topology and coordinate services capabilities QoS at each site the differentiated service Diff-Serv, using similar technology management quality of service (QoS) server/resource. All of these techniques for the core network, using the model of differentiated service Diff-Serv, specially introduce a level of control vehicles designed for resource management and network topology. This model differentiated service Diff-Serv with specialized management of network resources, shown in figure 2, is called a model of differentiated service Diff-Serv with independent level control transport.

In the model of differentiated services with independent level control edge transport router network classifies and marks the field DS of each group and uses the DS field of the IP packet or EXP packet information for MPLS transmission priority information of the IP group. On the main host router selects an appropriate transmission method of the packets based on the priority information. The server level traffic management, including the mediator bandwidth CENTURIES or Manager QoS server/resource configure rules control the deposits and the topology of the network, and share resources, providing bandwidth for the requested service by the subscriber. Bandwidth is specified (divided) when signing the subscriber agreement (SLAs (Service Level Agreement - SLA).

The servers manage the transport network each plot control with alarm send each other information about the requested bandwidth services and results, information about the route selected for the requested services by the resource Manager of the transport network, etc. Now in the existing model of differentiated service Diff-Serv with independent level control transport, for example the model of the mediator of the network bandwidth Qbone, there are problems such as difficulties in implementation, planning, management and maintenance.

In the first known model design Internet2 CENTURIES, shown in Fig.3, Internet2 determines appropriate intermediaries bandwidth CENTURIES for each site management with differentiated service Diff-Serv, and the intermediary bandwidth CENTURIES handles requests for the allocation of bandwidth for applications coming from the computers of subscribers, the service server S or maintenance staff network. The mediator bandwidth determines not to provide bandwidth to the application depending on employment R the resources of the current network, configuration policies and agreements (SLAs) SLA signed with the subscriber.

As shown in figure 4, the Manager bandwidth records a large number of static and dynamic information, including various types of configuration information agreements (SLAs) SLA, the topological information of the physical network configuration information and policy routers, identification information of the user, current information on the reserved resources and the status of the network is busy, etc. At the same time the Manager of bandwidth also records information about the route to determine the route of a transport stream (streaming traffic) and the subsequent position of Manager of bandwidth in the overlapping areas.

Topology and control Manager bandwidth model lnternet2 very difficult, because the Manager bandwidth directly manages information about resources and about the configuration of all routers in the area, and this creates a problem. Also, because the Manager of the bandwidth needed to capture the dynamic routing information area, the routing table is updated quickly, which leads to instability reserved network. In addition, the route defined for the services using dynamic route the second data area, it is hard to reconcile with the real route of advancement of the transport stream.

Because there are too many problems in the model Manager bandwidth, this model is still not implemented as a commercial application.

The second well-known scheme, in the way that Rich QoS Japanese firm NEC presented on Fig.5, the QoS server (QS) is considered as a key element. To implement the method also use the policy server (CS), directory server (DS) and server monitoring, network management. The policy server provides the setting and configuration of connected routers in accordance with configuration information policy, such as information about the QoS server and the management interface. The directory server is a concentrated database for storing information about the configuration of network devices, user information and information about quality of service (QoS). Server monitoring, network management is responsible for collecting information, such as group status of routers and links, etc. that can be sent to the QoS server for routing service application.

QoS server is responsible for reserving transport route, which would satisfy the requirements of QoS, based on the network topology and the status of resources of the transport network. In the QoS server must Ave varicella add information on the topology and bandwidth, as well as pre-configured rules for the selection of the route. When the server sends a QoS request to the server to allocate bandwidth, QoS server stores the request for resources for this call, reserves the transport route, which would satisfy the requirements for quality of service (QoS), the current topology and the status of the resources of the transport network for the requested service and returns a response with the results of the backup server services.

QoS server sends to the policy server according to autoclave classes of service bandwidth corresponding command policy modification LSP (Label Switched Path - Route Label Switching). Then the policy server configures the corresponding edge router according to the data obtained from the QoS server commands.

The edge router will use the technology MPLS show LSP route to update or clarify the route of the LSP according to the route specified QoS server.

In the proposed NEC scheme Rich QoS there is also a complex transport network, which is managed by the QoS server, and a large number of routers. The QoS server and the policy server to inform neighboring routers use MPLS show LSP route. The disadvantage of the model setup of the LSP route from end to end is a small extent, and Ogre is icandy the size of the network. Thus, this scheme is unable to meet the installation requirements of the service route from end to end in the national global public network.

As Manager of bandwidth directly manages the resource information and the configuration information of all routers in the area, the topology and the management is very complex, which is a problem. The solutions offered by other manufacturers, such as firm NEC, the QoS server still manages complex transport network. The disadvantage of the model setup of the LSP route from end to end using technology display of the route used in the transport network is of small extent, and the limited size of the network and the inability to meet the requirements of service from end to end in the national global public network. Therefore, the problem of execution requested by the subscriber services, such as voice over IP Protocol (VolP (Voice over IP) or video (video telephone) and others, from the source edge router to edge router with guaranteed quality of service (QoS) in large backbone IP network provider of telecommunications services in urgent need of solution.

The ESSENCE of the INVENTION

The aim of the present invention is to provide a method of promoting Tran the tailors flows with guaranteed quality of service QoS in IP networks with high extensibility, applicable in large networks, while meeting requirements for quality of service QoS services from end to end in branched networks.

Another objective of the present invention is to provide a system for promoting transport streams with guaranteed quality of service QoS in IP networks with high extensibility, applicable in large networks, while meeting requirements for quality of service QoS services from end to end in branched networks.

The method in accordance with the present invention includes the following steps:

A. after receiving from the subscriber a request for services that require guaranteed quality of service QoS, server control services in the network analyzes the request and determines the addresses of the subscribers of the sender and recipient, as well as the QoS parameters of the service and sends a request to route selection and resource allocation the resource Manager transport network control plane transport;

b. in accordance with the specified addresses of the sender and recipient, and type of services specified resource Manager transport network assigns the route and resources to provide services in a logical transport network services when the service is provided within the boundaries of one section with independent control, or assigns March the ut and resources to perform the services by exchanging signals with other resource managers, when the service covers several sections with independent controls; and

C. after receiving the assigned route edge node encapsulates a transport stream with a multi-level label stack and promotes transport stream with multi-level label stack to the transit switching node through the first LSP; transit switching node replaces the current top label of the transport stream received from the previous LSP, then promotes the transport stream to the next LSP in accordance with the current top label until then, until the traffic reaches the edge of the destination node.

In the above way using technology Multiprotocol label switching (MPLS) - based route label switching (LSP) establish communication between nodes. Logical transport network services pre-planning and pre-configure from the main network, depending on the type of service.

Step b. also includes a step at which the level of service management information is transmitted to reject the request for services to the subscriber when the resource Manager transport network rejects the routing due to insufficient resources the logical topology of the site.

The system in accordance with the invention includes: level core network containing the edge and the magician is a washing routers, designed to transport packets of different IP services; logical and transport layer services, planned and configured from the core network and is designed to move traffic flows that require guaranteed quality of service QoS; traffic management designed to control the resources of the transport network of the above-mentioned logical transport layer services and the level of the core network; and the level of management services, containing objects services for processing requests for services. Level traffic management contains a variety of resource managers, each of which is responsible for the selection of network resources and route for the provision of certain subscriber services in this area independently controlled, and when the service covers multiple sites with independent management, a route in the transportation network to provide this subscription service is established by exchanging signals between multiple resource managers. Logical transport layer services includes edge routers acting as border nodes, transit switching routers acting as a transit switching nodes and links of the LSP between them, and transit switching nodes use the comfort to displace the current top of the label transport stream, obtained from the previous LSP, and subsequent promotion of the transport stream to the next LSP in accordance with the current top label.

In comparison with the second known technical scheme, the present invention is logical transport layer services includes edge routers acting as border nodes, transit switching routers acting as a transit switching nodes and links of the LSP between them, and transit switching node used to displace current top label of the transport stream received from the previous LSP, and subsequent promotion of the transport stream to the next LSP in accordance with the current top label. Thus, thanks to the transit switching implemented transit switching nodes, there is no need to establish a direct connection between every two routers in the entire network, and all connections between each two edge routers can be set up through many transit switching nodes. Thus the topology of the network is greatly simplified and the total number of connections is significantly reduced, allowing high scalability by implementing a technical solution according to this invention.

In addition, in this invention the level of the Board the transport contains many resource managers. Each resource Manager is responsible for the selection of network resources and route for the provision of certain subscription service on a separate site independently controlled, and when the service covers multiple sites with independent control of route selection is carried out through the cooperation of many resource managers. Thus, the load on each individual resource Manager is reduced and the use of many managers allows to apply this scheme in a branched network.

Using the transport network technology multi-level stack of MPLS labels, traffic, subscribers can move in accordance with the route assigned in the physical network IP level traffic management. So with the help of the present invention can at the appropriate level to meet the requirements for quality of service (QoS services from end to end in the networks of General use.

In addition, presents a new level of management of transport network does not require the reconstruction of the network routing Protocol. Do not require modifications, and backbone routers, designed to promote traffic flows along the route defined by the transport network using the multi-level stack of labels in the MPLS technology. Thus, the present image is the group has no significant impact on the existing network.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is a schematic view of a network architecture IP network;

Figure 2 is a schematic diagram of the network model with independent level control transport;

Figure 3 is a schematic representation of the model lnternet2 with a mediator bandwidth;

4 shows a functional diagram of a mediator bandwidth;

figure 5 presents the model Rich QoS offered by the Japanese company NEC;

6 is a schematic representation of the full model of the present invention;

Fig.7 shows the logical network transport services established by the route of the LSP of the MPLS technology;

Fig is a schematic representation of the procedure for selecting the route level traffic management;

Fig.9 is a block diagram illustrating the function of the edge router;

figure 10 shows schematically the route services;

11 is a schematic representation of the procedures for the promotion using a layered stack of labels;

on Fig presents a functional diagram of the present invention.

A DETAILED DESCRIPTION of the INVENTION

The method in accordance with the present invention, presented at the

Fig, includes the following steps:

Step a: the subscriber initiates a request to perform services requiring guarantees the consistent quality of service QoS; analyzing the service request corresponding to the object network services defines the address of the recipient is the sender, the address of the subscriber receiver and required for this service, the QoS parameters and then sends to the control level transport network a request for route selection and resource allocation.

Step In: the resource Manager of the transport network level traffic management allocates the logical transport network route and resources to perform the services in accordance with the address of the subscriber of the sender and recipient and service.

When selecting a route using multi-level label stack, and the level of traffic management transmits information on the layered stack of labels in the edge nodes of the logic transport network.

Upon detection of a failure in the choice of route, caused by the lack of resources logical topology of the site, the resource Manager transport network requests the management level services to reject the service request.

Step: transport stream is moving in the logical network transport services in accordance with the route reserved logical transport layer.

In logical transport network service edge node of a transport stream from the sender encapsulates the multi-level label stack of the route in each sent data packet of the transport flux is A. The logical nodes of the transport network services promote the transport stream according to the multi-level stack of labels. When the data packet of the transport stream passes switching node, one level removed from the multi-level stack of labels.

Hereinafter the present invention will be described in more detail with reference to the drawings and with the example of the backbone IP network.

Figure 6 presents the General scheme of the network in accordance with the present invention, the functional network model consists of a transport network, consisting of a level of a core network and a logical network transport services, traffic management and control services.

From the point of view of physical objects, the network consists of edge routers E and backbone routers RH, for the transmission of IP packets use the level of the core network, part of the transport network. Logical transport network services, part of the transport network is a logical network that is pre-planned and based on the level of the core network using MPLS technology.

Level traffic management manages resources of the transport network logical transport network and the level of the core network. He chooses the transport route that meets the requirements for quality of service (QoS) requirements to the logical transport network in the meadow subscriber's request for service.

The level of management services consists of multiple servers to handle requests for service, such as SoftSwitch, designed for processing of speech and image Protocol (VolP/Video Telephone, a Web server VoD service that is designed for query processing VoD subscribers.

From the point of view of ease of control and stability of the network, the IP network is divided into different areas of the management of network resources, shown in phantom lines. Dividing the network into areas of the management of network resources can be correlated with the division of the network into sections routing. Each section controls the resource Manager transport network (SM), which is responsible for the calculation of network resources and the selection of a route for the service subscriber. Managers SEE different parts logically create a transport network of the selected route. Network transport route satisfying the requirements for quality of service (QoS request to the service subscriber, covering several areas of management, can be selected by passing the service of alarm signals between the sections.

The level of the core network is the last level of transport devices for various IP services. This level core network transfers as Internet services without guaranteed quality of service (QoS), and IP services with guaranteed is the quality of service (QoS). For optimal transfer on the primary IP transport network with guaranteed quality of service (QoS) such transport streams and transport streams of Internet services that do not require guaranteed quality of service (QoS) should be separated and transmitted by different routes.

In the network structure of the public switched telephone network PSTN (Public Switched Telephone Network), which consists of border services, transit services, local long distance stations (provincial toll offices), international long-distance stations (international toll offices and communication channels between them, based on the primary IP network can be planned in a logical transport network services for one type of IP services. Logical transport layer services consists of edge nodes, transit switching nodes and logical links between nodes. Border router E is an edge node of the transport network services. At each site resource management IP network as a transit switching node R can be selected multiple backbone routers RH. The nodes are connected according to the route of the LSP, preset, for example, in accordance with MPLS technology, together with technology, regulation of traffic for MPLS static configuration of the route of the LSP can be used by other signaling protocols, such is as RSVP-TE (ReSerVation Protocol-Terminal Equipment - the resource reservation Protocol - terminal equipment) or CR-LSP (Call Request-Label Switching Path request route label switching LSP), to route the LSP reserve bandwidth and other QoS features. Figure 7 shows the logical transport network transport stream formed by the edge nodes, transit switching nodes and connections LSP.

Logical transport MPLS network may also use a hierarchical technology LSP, in other words, the LSP connection between border/transit switching nodes may be run, in addition to several physical channels, a few lower level LSP. But these lower levels LSP is organized as tunnel interfaces in the transport network, and they do not affect the logical transport network services. Level traffic management is only necessary to set the LSP connection between border/transit switching nodes and do not want to handle the lower levels of the LSP.

After receiving from the subscriber a request to the service with guaranteed quality of service (QoS) traffic flow arrives at an edge node (edge router), and the edge node transmits the traffic flow in a logical transport network. Transport stream starts from the edge node of the sender, then were is it several transit switching nodes and reaches the edge node of the recipient. Promotion of traffic flow in a logical transport network can uniquely be determined according to the route of the LSP, a given level of transport management. This way you can organize controlled promotion of traffic flow on the route and prevent joint transmission of these transport streams with transfer Internet service, thereby ensuring the QoS of the transport stream, and the level of service in IP networks reaches the level of service in the public switched telephone network PSTN.

There are many ways the logical planning of the transport network at the level of the core network. The telecommunications service provider can design a city of the territorial network, peripheral and national backbone network and even international backbone network is similar to building a telephone network PSTN.

For various services, such as VolP, video and VoD, and other, respectively, can be designed and configured independent logical transport network. Of course, the topological structure of the logical transport networks, each service can be the same or different, depending on the actual status of a specific process, selection transit switching node, model transformations, and time is Yeni waiting for each service.

Network topological structure of the logic transport network, reserved and set the level of the core network for each service with guaranteed quality of service (QoS), will be included in the resource Manager of the transport network SEE the level of traffic management, also Manager CM is informed of the location of each route of the LSP between nodes. Manager CM will manage logical transport network of various services in its area of control.

Level traffic management calculates resources and selects for each of the requested services route in logical transport network. Level traffic management consists of managers SEE all the sites, and each Manager CM manages resources and selects a route in the logical network transport services on the site. Resource management and routing in all areas covered by the application service may be effected by the transmission of alarm signals between the various managers CM.

For any conversation to each subscriber must be sent using a service alarm, request for service, such as VolP call or a request for a video call. After receiving the application corresponding to the processing server services evaluates the rights of the subscriber for this service and addresses of the calling and called subscribers, determine AET QoS settings, for example, the need for this conversation, bandwidth, etc. and then refers to the level of traffic management for appropriate resources and transportation route services. The interface may be internal or outdoor (external), which depends on the specifics of the process. If the Manager CM is integrated in the server management layer service interface is internal. Other conditions for communication between management service and management level transport can be used for the transmission of alarm signals, such as session initiation Protocol communication Session Initiation Protocol (SIP).

After level management service request routing and resources for the application Manager CM level traffic management will begin the selection of this route request in the logical network transport services in accordance with the addresses of the sender and recipient. If it is found that in the logical topology of the transport network in this area do not have sufficient resources Manager CM will inform the level of service management about the refusal of the request of the subscriber. If the route is successful, the Manager CM will instruct the appropriate edge router to set the necessary parameters quality of service (QoS) and routing options services, appropriate transport IP is the Otok. After the subscriber call level traffic management releases the resources occupied by the subscriber, and instructs the corresponding edge router to terminate the processing of the IP transport stream.

When it comes to the support of the conversation, covering several areas of resource management, Manager CM-level management of transport not only carries out the routing on the site, but also selects the Manager CM adjacent plot and sends a request for routing in accordance with the address of the recipient-the recipient or number, is similar to the output (external) route (outing route) in the public switched telephone network PSTN.

Information request between managers SEE not only includes information about the subscriber to the recipient, but also information about the traversed route segments, i.e. information about which parts of the route LSP passed. After receiving the query from the previous Manager, SEE the current Manager CM is looking for a route to the destination. If the plot itself is a destination, Manager CM selects, based on the information on the input route of the LSP and the requirements for quality of service (QoS), the route on the site and informs the previous Manager CM on the selected route. If the area is not the area of destination management is R CM determines the subsequent CM in accordance with the information about the subscriber-receiver, for example a telephone number or IP address, etc., selects a route on the site according to the information about the input route of the LSP and the requirements for quality of service (QoS), and then sends a request message for the next Manager CM. The information request includes information about the subscriber-receiver to route information services can be added route information within the area, i.e. information about which routes LSP passed.

If you find that the area does not have enough network transport resources Manager CM will reject the application services and will send an error message to the previous Manager CM. Managers SEE along the way will free resources and will give the error message the previous Manager CM. Primary (initial) Manager CM will inform the level of service that the request is denied after receiving the error message.

When the service terminates the subscriber level management service sends a command about the release of resources to the relevant managers SEE. Managers CM, located on the route of this service will free the already allocated for this service resources.

On Fig presents the possible execution of application services at subscriber level traffic management, as an example, we consider the case when the subscriber S1 zaprosi the AET communication with the subscriber S2. Thus, the subscriber S1 is connected with within the plot And the edge router E1 subscriber S2 is connected with within section D of the edge router E2, managers, CM -, CM -, CM-and CM-D control stations a, b, C and D, respectively.

(1) After determining the addresses of the calling and called subscribers in the analysis of the subscriber connection request, the server control service sends a request to the Manager CM AND plot subscriber S1 with a request to route the flow of traffic between the subscribers S1 and S2.

(2) After receipt of the request Manager CM AND selects as the next Manager CM-WITH in accordance with the address or phone number of the subscriber S2, as well as routes "LSPa1/LSPac" as routes from node E1 to the site in accordance with the current state of resources of the site And then updates the status of the logical resources of the transport network, recorded in the Manager CM-A.

(3) the Manager CM AND sends the information request to a subsequent Manager CM-C. This information request includes call information, such as addresses or phone numbers of S1 and S2, the required parameters of quality of service (QoS) and can also include information about the route LSPa1/LSPac" on the section A.

(4) After receiving the request for information about resources Manager CM AND Manager CM-organizes its input route LSPac and browsing, and the formation of the transport route matching information about the caller on the secondary S2, determines the subsequent Manager CM-D. Then the Manager CM-selects in accordance with the input route LSPac output route out of phase With LSPcd, the subsequent section D, requirements for quality of service (QoS) application services and the status of the resources section C.

(5) Adding the route information on a plot to the received information request, the Manager CM-again sends the information request to a subsequent Manager CM-D. Information request includes information about participating in the connection of the subscribers S1 and S2, the requested QoS parameters and the route information in the form of "LSPa1/LSPac/LSPcd"traversed by the application of the call.

(6) After receiving the information request from the Manager CM-Manager-CM-D arranges the input route to the site D LSPcd determines, by viewing the information on the transport route for compliance information subscriber secondary S2, the edge node E2 in area D. Then the Manager CM-D selects the input route LSPcd route LSPd1 as a route to node E2, the destination node E2, parameters of quality of service (QoS) application services and the status of the resources on the site D.

(7) the Manager CM-D sends the previous managers SEE a message informing about the successful allocation of resources. The message includes information about participating in the connection of the subscribers S1 and S2 and the full path of the application call "LSPa1/LSPac/LSPcd/LSPd1".

In addition to the aforementioned processes in areas covered by the services can be performed and some other machining processes. Subscriber application services can be unidirectional or bidirectional traffic flow. When this bidirectional transport stream routes in both directions can be assigned to the same route or different routes. No matter what the process is, the level of transport management will select the full path in the logical transport network for each application service.

As shown in Fig.9, Manager CM after installation transport route instructs the edge router of the site that hosts the subscriber to set the QoS parameters such as bandwidth and priority traffic flow, etc. and to establish a transport route of the transport stream, to ensure that this transport stream is processed according to the QoS parameters defined by the service, and to ensure that traffic moves along a route defined by the managers SEE. When the subscriber application is successful, under the control of the Manager, SEE the edge router generates the corresponding elements of the table classification of a transport stream, stores the QoS parameters, is such as bandwidth and priority, the requested transport stream, and transmits the routing options in the transport network for the traffic flow. The edge router will start processing the IP packet belonging to the flow of traffic, in accordance with the defined parameters of quality of service (QoS) and transmission needs. When the subscriber terminates the service edge router under the control of the Manager CM will remove the corresponding items in the table classification of a transport stream.

To promote traffic flows on a given transport route in the network can be used as a way of indicating the route (method of display route), and multi-level stack of labels in the MPLS technology. In the present embodiment use the method of multi-level stack of labels.

After you select the dial plan application services transport route level traffic management informs the edge router of the transport network on the transport route for a particular traffic flow and promotes transport stream according to the route specified level traffic management by using method a layered stack of labels in the MPLS technology. The edge router at the team level traffic management encapsulates the IP packets of the transport stream of the multi-level label stack, and transit routers is ereaut only pre-configured labels. At the points of commencement and completion of the route of the LSP set switching routers, it is preferable to be able to handle a two-level label stack.

Figure 10 presents the procedure for transmission using multi-level label stack, between the two edge routers E1 and E2 are several backbone routers. Transport stream subscription service is being passed from the edge router E1 to E2. Traffic is assigned to the transport stream control transport, the following:

edge router E1-LSPa → switching router RA-LSPb → switching router RB-LSPc → switching router RC-LSPd → border router E2.

If the label corresponding to each node of the route are global labels such as global label for E1 route LSPa is La, the global label for RA route LSPb is Lb, the global label for RB route LSPc is Lc and the global label for RC route LSPd is Ld, the label stack to route LSPa → LSPb → LSPc → LSPd is La/Lb/Lc/Ld, where La is the top level of the stack of labels.

As shown in figure 11, if the function is popping from the stack on the penultimate hop is not configured in the routers along the route, promotion MPLS transport stream the transport network following.

First, when a packet of the transport stream reaches the edge router E1, E1 command level traffic management encapsulates the packet label stack La/Lb/Lc/Ld, where La is the upper level of the stack of labels. Then E1 sends the packet MPLS route LSPa. When the MPLS package is moving on the route LSPa, he goes through several routers, but all of these routers transmit MPLS package only in accordance with the top label of the stack of labels and possibly replace this top label.

When the MPLS package arrives on the route LSPa in switching router RA, because the route LSPa ends in RA, RA replaces the top label and forwards the MPLS package in accordance with the second label Lb. Therefore, the MPLS package will go on the route LSPb with a stack of labels, reduced by one level.

Similarly, the MPLS package is further along the route LSPb. When the MPLS package goes through several routers, these routers transmit the MPLS package only in accordance with the top label of the stack of labels and possibly replace it. After the router RB will receive MPLS package, because the route LSPb ends at RB, he replaces the top label stack label and forwards the packet according to the following MPLS label Lc. Therefore, the MPLS package is on the route of LSPc with a stack of labels, reduced by one level.

When the MPLS package arrives at the router RC, since March the ut LSPc ends in RC, RC replaces the top label and forwards the packet according to the second MPLS label Ld. Therefore, the MPLS package is transmitted along the route LSPd to a switching router RC with a stack of labels, which was the last label.

During packet MPLS route LSPd maybe he goes through several routers and these routers can replace the label. Thus MPLS package arrives to the border router of the destination E2 route LSPd. When E2 receives the MPLS package, because LSPd ends in the edge router E2, mark will be replaced and an IP packet of a transport stream will be restored.

In the above description, as an example, examined the use of global tags when transmitting the transport stream. In practice, based on the same principle the basic transfer method using MPLS, the way a layered stack of labels in the MPLS technology can be made, provided that, for transmission of the transport stream using a local label, and also provided that the function of the displacement from the stack and configured on the penultimate hop. The specifics of this process in this description shall be omitted.

The present invention can be used as a network-wide provider of telecommunications services, and accordingly, in each local network. For services, the coverage is non multiple network providers, the present invention can be applied separately in each network.

The above description is merely a preferred embodiment of the present invention, and it should not be interpreted as limiting the scope of the present invention.

1. Way to promote traffic flows with guaranteed quality of service QoS in networks running Protocol, containing level management service level management transport and logical transport layer, and the level of traffic management contains many resource managers network, and the logical transport layer services includes edge routers acting as border nodes, transit switching routers acting as a transit switching nodes, and connections LSP between them, comprising the steps:

(a) after receiving from the subscriber a request for services that require guaranteed quality of service QoS, server control service analyzes the request and determines the addresses of the subscribers of the sender and recipient, as well as the QoS parameters of the service and sends a request to route selection and resource allocation the resource Manager transport network control plane transport;

b) in accordance with the specified addresses of the sender and recipient, as well as in the home services specified resource Manager transport network assigns the route and resources to provide services in a logical transport network services, when the service is provided within the boundaries of one section with independent control, or assigns the route and resources to perform the services by exchanging signals with other resource managers when providing services spans multiple sites with independent control;

(C) after receiving the assigned route edge node encapsulates a transport stream with a multi-level label stack and promotes transport stream with multi-level label stack to the transit switching node through the first LSP; transit switching node replaces the current top label multi-level stack of labels of the transport stream received from the previous LSP, then promotes the transport stream to the next LSP in accordance with the new current top label multi-level stack of labels until then, until the traffic reaches the edge of the destination node.

2. The method according to claim 1, in which the above-mentioned logical transport network services pre-planned and configured from the core network, depending on the type of service.

3. The method according to claim 1, in which the LSP-communication between the edge nodes and transit switching nodes installed according to the technology Multiprotocol label switching (MPLS).

4. The method according to claim 1, in which the above-mentioned transit switching from the ly - this is part of the backbone routers, selected parts of the network resources management.

5. The method according to claim 1, wherein step b) further includes the instruction-level management services to reject the subscriber's request for service when the resource Manager transport network detects a failure in the choice of route, caused by the lack of resources in the logical topology of the site.

6. The method according to any one of claims 1 to 5, wherein the logical network transport services have the same topology or topology for each type of service.

7. The method according to any one of claims 1 to 5, in which the network structure of the above-mentioned logical transport network services identical or similar to the structure of the telephone network of General use.

8. The method according to claim 1, in which the above-mentioned logical transport network services - this city's local network, or peripheral backbone, or national backbone network, or international backbone network.

9. The method according to claim 1, wherein the network is an IP backbone network, or LAN, or the urban network, or interconnected network.

10. The method according to claim 1, in which service requiring guaranteed quality of service QoS is a service of the voice, or video communications service, or a service for streaming video, or other service with special requirements the m to the quality of service QoS.

11. The method according to claim 1, further comprising the step of: after completion of the services by the subscriber above the level of transport management frees the resources allocated to the service, and instructs the corresponding edge routers to terminate the processing of the transport stream.

12. System for moving traffic flows with guaranteed quality of service in networks running Protocol, consisting of

level core network, including edge routers and backbone routers designed for transferring IP packets of different services;

logical transport layer, planned and configured from the core network to transfer traffic flows with guaranteed quality of service QoS;

level traffic management designed to control the resources of the transport network of the specified logical transport layer services and the level of the core network; and

level for management services, including facilities services, designed to handle requests for services, where

this level traffic management contains many resource managers of the transport network, each of which is responsible for the selection of network resources and route for the provision of certain subscription services on this site with independently researched is affiliated management, and when the service covers multiple sites with independent management, a route in the transportation network to provide this subscription service is established by exchanging signals between multiple resource managers,

moreover, the specified logical transport layer includes edge routers acting as border nodes, transit switching routers acting as a transit switching nodes and links of the LSP between them, and transit switching node used to displace current top labels layered stack of labels of the transport stream received from the previous LSP, and subsequent promotion of the transport stream to the next LSP in accordance with the new current top label multi-level stack of labels.

13. System according to clause 12, in which the LSP communication between nodes logical transport layer services set by using the MPLS technology.

14. System according to clause 12, in which these transit switching nodes are part of the backbone routers, selected on the areas of independent control of network resources.



 

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