Base station, mobile station, communication system, transmission method and reordering method

FIELD: radio engineering, communication.

SUBSTANCE: mobile station includes a receiving means for receiving a first packet data convergence protocol (PDCP) protocol data unit (PDU) from a source base station; a receiving means for receiving a second PDCP PDU from a target base station, in which the second PDCP PDU is created using a sequence number and a PDCP service data unit (SDU), that are transferred from the source base station to the target base station; a storage means for storing PDCP SDU corresponding to the first PDCP PDU and the PDCP SDU corresponding to the second PDCP PDU; and a reordering means for performing order delivery of the stored PDCP SDU based on the sequence numbers.

EFFECT: fast transmission of packets that are transmitted from a master station to a target base station for transmission thereof to a mobile station.

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The technical FIELD TO WHICH the INVENTION RELATES.

The present invention relates to a base station, mobile station, communication system, transmission method and method reorder.

The LEVEL of TECHNOLOGY

Presently, mobile communication systems, such as mobile phones, started the service type of the third generation CDMA (multiple access, code-division multiplexing), however, the study of mobile communication systems of the next generation (LTE: long term evolution), which can have an even faster connection, moving 3GPP (partnership Project 3rd generation) (refer to 3GPP, "Requirements for advanced UTRA (E-UTRA) and developed UTRAN (E-UTAN)" ("Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTAN)", TR25.913 V7.3.0, revision 7 March 2006). Some of the major challenges in this study include increasing the transmission speed and reducing latency.

In order to increase the transmission speed and reduce latency in the communication system, LTE, use the transfer method of the service developed with the ability to be at a higher level than the traditional system. In the mobile communication system when the mobile station moves during the communication, the base station with which the mobile station communicates, switches (transmits care what ia) according to the reception status. Therefore, in order to communicate with high speed transfer and low latency transmission, improving transmission service is important. In the LTE communication system, the exchange system package is the main, therefore, the transfer service is hard to transmission service. When the hard transfer service, after disconnects the communication link with the base station with which the mobile station kept in touch before the move, connects the communication line between the mobile station and the target base station. When the hard transfer service, by receiving system information of the target base station prior to a transmission service, it is possible to perform transmission service for a short time; however, the transfer of user data becomes intermittent during transfer service.

Therefore, in order to reduce latency, it is important that the condition of the intermittent transmission has been reduced, and so was prevented packet loss, while the transfer is aborted. In the case in which the packages are lost during the interruption of transmission, the lost packets are recovered in end-to-end re-transmission of packets, so the transmission delay becomes large.

Therefore, when the transmission service is tion in the LTE communication system prescribed way, in which among the data, which include control information and packets for the mobile station, the packets that have not yet been transferred to the mobile station from the source base station is intercepted by forwarding these packets to the target base station from the source base station (refer to 3GPP, "Evolved universal terrestrial radio access (E-UTRA) and developed a universal network terrestrial radio access (E-UTRAN)" ("Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN)"), TS36.300, release 8, V8.0.0, April 2007).

• Interception during transmission services

Fig. 21 is a drawing explaining an interception during transmission services. In (A) Fig. 21 two base stations 1a and 1b attached to the master station 2 (e.g., gateway MME/SAE). Mobile station 4 exists within a cell 3a of the base station 1a and currently supports communication with the base station 1a. In this state, as shown in (B) Fig. 21, when the mobile station 4 moves toward the base station 1b and included in the honeycomb 3b, transfer service, and a base station, which supports communication of the mobile station 4, is switched from the base station 1a to the base station 1b. Here the base station, which is in communication with the mobile station before the mobile station moves, called the outcome of the th base station, and the base station that communicates with the mobile station after the mobile station moves, is called the target base station.

The source base station 1a stores the packets that are sent from the master station 2 in an internal buffer and sequentially transmits the packets stored in the buffer, the mobile station 4. Therefore, when the transfer of packets that are not sent to the mobile station, and stored exists in the buffer. On (B) Fig. 21 it is necessary that before the transfer of packets n-2 to n have been taken and stored in the buffer without sending the mobile station, and thus, after transmission of the service, it is necessary that these packages were sent to the mobile station 4 from the target base station. Hence, if the sequence of transfer of the source base station 1a transmits (sends) the packets n-2 to n to the target base station 1b. Using this method of shipment, the target base station sends these packets to the mobile station 4 directly after transfer service, so no break in packages not happening. Therefore, it becomes possible to perform high-speed transmission service without the implementation of end-to-end retransmission. In the explanation given above, with n-2 through n are numbers (orders of magnitude the mi numbers), which indicate the sequence of packets.

• Transfer service

Fig. 22 is a drawing illustrating a transfer service in the LTE communication system, and Fig. 23 is a drawing explaining a procedure of the transmission service, which is assumed to communication systems LTE currently.

Using the measurement report (report on the status of the base station 1 and other surrounding base stations, the mobile station 4 notifies the source base station 1, which required the transfer of HO (transfer service) (1. The management dimension).

The source base station 1 selects a target base station 1b according to the contents of measurement report (2. Selection HO) and sends a transmission request service 3. The request transmission service) to the target base station 1b. At this time, the source base station 1a also sends information about the mobile station ID (identifier) of the mobile station, information about QoS (quality of service), and so on). The target base station 1b performs admission control call on the basis of such information (4. Admission control call).

After you allow the access of the mobile station to the target base station 1b returns the response transmission service source base station (5. Response HO). After that, the source base station 1a sends a command transmission maintenance mobile station and 4 (6. The HO command), then, directly after that, starts the interception of data (packets) (Transfer packet forwarding).

The mobile station 4 receives the command transmission service, and then reaches synchronization using alarm L1/L2 (7. Synchronization), and after was achieved synchronization, sends a completion report transmission service to the target base station 1b (8. Complete HO).

After that, the target base station 1b sends a completion report transmission service master station 2 (9. Complete HO). After receiving the completion report of the transfer of the master station 2 changes the transmission path of packets from the source base station 1a to the target base station 1b (10. Change path and returns the response from the completion of the HO to the target base station 1b (11. Response complete HO). The target base station 1b uses the response is complete HO to notify the source base station 1a, the transfer of HO complete (12. The release of resources). After the path between the source base station 1a and the leading base station 2 is eliminated (13. The release of resources).

• Manage the alignment of the sequence of packets

When packets are sent (forwarded) during the execution of the transfer sequence of service described above, there is a possibility that packets that p is the steps the target base station 1b, will prepregnancy packets that come from the master station 2, resulting in the mixing of serial numbers. When packets pass from the target base station 1b mobile station 4 as is, mixed numbers, mobile station 4 is not able to receive packets in the correct order, so the communication quality deteriorates, and as a result, high-quality communication can not be achieved immediately before and after the transfer service.

Therefore, in the LTE communication system through the use of the method, as described below, a base station and a mobile station is able to maintain the order of packets. Fig. 24 is a drawing explaining the alignment of the sequence of packets in which the target base station 1b supports the sequence of packets, sending the packets sent from the source base station 1a with a higher priority than the packets that are received from the master station.

In Fig. 24, before the transfer of the packets n-5 through n are stored on the source base station 1a, and, of these packages with n-5 n-2 are sent to the mobile station 4, however, the packets n-1 and n are not sent to the mobile station 4. In addition, packets that are sent to the mobile station 4, the packets n-5 and n-3 are not taken correctly by the mobile station 4 (NACK), and the packets n-4 and n-2 are taken correctly (ACK). So mobile is I station 4 stores n-4 and n-2 in the buffer BF1 and store the packets n-5 and n-3.

When the transfer occurs in this state, the source base station 1a transmits (sends) the packets n-5 and n-3 that were not accepted correctly by the mobile station 4, and the packets n-1 and n that have not yet been sent to the mobile station 4, the target base station 1b and the target base station 1b stores these packets in the buffer BF. In addition, after the transfer of the master station 2 sends two packets of m by m+1, which are intended for the mobile station 4, the target base station 1b and the target base station 1b stores these packets in the buffer BF.

After communication with the mobile station 4 is possible, the target base station 1b primarily sends the packets n-5, n-3 and n-1 to n, which is forwarded from the source base station 1b mobile station 4. Then the target base station 1b sends packets with the m by m+1, which were taken from the master station 2. As shown in Fig. 25, the mobile station 4 rearranges the order of the packets n-4 and n-2, which were taken before the transfer, and the packets n-5, n-3, n-1 and m by M+1, which were adopted after the transfer service, and outputs these packets in order to the top level.

In the explanation above has been explained a case where all the packets n-5, n-3 and n-1 n was transmitted (uploaded) to the target base station 1b, but in some case the s will only transfer the packets n-5 and n-3, and transmission of packets n-1 and n will be delayed. Fig. 26 is a drawing illustrating the location of the sequence of packets in this case. The target base station 1b stores the transmitted packets n-5 and n-3, together with the packets m, m+1, which come from the master station 2, the buffer BF, but sends the packets n-5 and n-3, which is forwarded from the source base station 1a mobile station 4 first. After that, in the case in which the packets n-1 and n transfer from the source base station 1a later, the target base station 1b monitors exceeded the specified time (timeout), and when the packets n-1 and n still not been forwarded from the source base station 1a even after it has expired standby timer, the target base station 1b determines that the shipment has been completed and sends the packets m and m+1, which were taken from the master station, the mobile station. Even if the packets n-1 and n can be taken from the source base station 1a after the shipment has been completed, the target base station 1b discards these packets.

Mobile station 4 performs a process for rearranging the order of sequence numbers of received packets (reordering). As shown in Fig. 27, the mobile station 4 moves the sequence numbers of the packets n-4 and n-2, which were taken before the transfer, and the packets n-5, n-3, m and m+1, which were adopted after the transfer of the services, and outputs these packets in order to the top level.

• Configuration protocols

As described above, when the transmission service in the communication system of LTE transfer (forwarding) packets and reordering of packets are needed technologies. The relationship between these functions here will be explained in more detail.

Fig. 28 is a drawing explaining the configuration of protocols between the mobile station and the base station. Between the mobile station and the base station has at least the PDCP level (level Protocol packet data convergence), RLC (radio control) and lower level (level control (MAC access to the transmission medium)/physical layer MAC/PHY). The function of routing packets or the like provided in the MME/S-GW.

The main features of each Protocol such as described below.

(1) PDCP: At the level of the transmitting side PDCP compresses the header of the Protocol, and attaches a sequence number and transmits. Receiving side checks the sequence number and, in doing this way, is in the process of dropping excess intake. Retransmission is not performed at the level of the PDCP.

(2) RLC: RLC Level - the level that has the function of re-transmission, and at the level of the RLC data to the newly attached sequence number, which is different from the sequence number that prikra the Yong to data from the level of the PDCP, and then the data is transmitted. For example, when data having a sequence number n, are taken from the level of the PDCP, the data are divided into data set, and for each partition of the data sequence numbers 1(1), 1(2), 1(3),... attached at the RLC level, after which the data is transmitted. Receiving party shall notify the sending party using these sequence numbers I( • ) to send a confirmation of transmission (Ack/Nack)indicating whether the data is received correctly or incorrectly. When the returned signal Ack, the sending party removes data that is saved, however, when returned to the Nack signal, the sending side retransmits the data is stored.

(3) the Lower level

• MAC: the MAC Level is the level that multiplexes/demuxes data of the RLC level. In other words, the sending party multiplexes data of the RLC level and transmits data, and the reception side further demultiplexes the received data to the MAC layer to the RLC level.

• PHY: the PHY Level is the level for transmitting and receiving data via radio signals between the user terminal 4 and the base station 1 and converts the data of MAC level data the radio or converts the data in the radio data of the MAC layer.

Data intended for the mobile station, the first move from the top level (for example, IP layer (Protocol is as the Internet) to the level of the PDCP, to become SDU (block data services) PDCP, then attached the header information (ordinal level PDCP etc)to become PDCP PDU (Protocol data unit).

PDU PDCP send RLC to become RLC SDU, and additionally attaches header information (the sequence number of the RLC level, and so on), so he became the RLC PDU. PDU RLC passes through the bottom level, after which it arrives at the RLC level of the mobile station. At this level, the RLC header is removed, and RLC SDU going again, then, at the level of the PDCP, removes the header of the PDCP PDU to become a PDCP SDU, then the data is sent to the top level.

In this type of configuration protocols, in the LTE communication system, the packet forwarding is performed in blocks PDCP SDU, and the reordering is performed in blocks PDCP PDU. When the shipment is carried out in blocks PDCP SDU, header information, such as sequence number, not attached to the package unit SDU PDCP, so that the sequence number is not transmitted. Therefore, in the case where the forwarding is carried out in blocks PDCP SDU must send data PDCP SDU and header information that includes a sequence number, separately.

Data SDU RLC and PDCP PDU data are essentially identical data, so in the description for the present invention, unless otherwise specified, they will be referred to simply as the packages, and when the Commission is Yong room package this number is the serial number data PDCP PDU.

• Operation of the source base station

Fig. 29 is a block diagram of the operation of the source base station during a transmission service.

When the source base station 1a receives the field strength received from the user terminal 4 via a measurement report (step 101), the source base station 1a determines whether or not HO (step 102), and when the transmission service is not needed, returns to the beginning.

However, when it is determined that the transfer is needed, the source base station 1a selects the target base station 1b according to the contents of the measurement report and sends the request to transfer service to this target base station 1b (step 103). After that, the source base station 1a receives the response transmission service, which is sent from the target base station 1b (step 104), and forwards the remaining packets to the target base station (step 107).

Upon receipt of a message release resources, which is sent from the target base station 1b (step 108), the source base station 1a performs the resources are released (step 109).

• The functioning of the target base station

Fig. 30 is a block diagram of the functioning of the target base station during a transmission service.

After receiving the HO request from the source base hundred is tion 1a (which includes the ID of the mobile station, information about QoS and so on) (step 121), the target base station 1b performs admission control call on the basis of such information and determines whether to permit the mobile station (step 122), and when the mobile station is not allowed, performs post-processing (step 130) and completes the control transfer.

On the other hand, when the tolerance of the mobile station is allowed, the target base station 1b returns the response HO on the source base station 1a (step 123). The target base station 1b then stores the packets that are forwarded from the source base station 1a in the buffer (step 124), and receives a completion report from HO mobile station 4 (step 125). After receiving the completion report HO target base station 1b sends a completion report HO master station 2 (step 126). The master station 2 receives the completion report transmission service, then changes the transmission path of packets from the source base station 1a to the target base station 1b, and returns the response from the completion of the HO to the target base station 1b. After receiving a response from the completion of the HO from the master station 2 (step 127), the target base station 1b begins sending packets that were forwarded from the source base station 1a, the mobile station preferably, but once these packages have been sent, sends the packets, which were taken from the master station 2, mobile the station (planning: step 128). In addition, simultaneously with the step 128, the target base station 1b sends a release resources on the source base station 1a (step 129), and then performs the processing (step 130) and completes the control transfer. In the planning stage 128, when forwarding packets from the source base station 1a is delayed, the target base station 1b tracks have expired if the specified time (timeout), and when a single packet is not transferred, although the wait time has expired, the target base station 1b determines that the shipment has ended, and sends all the packets that were taken from the master station 2, and even if packets can be received from the source base station 1a after the shipment has ended, the target base station 1b discards these packets.

• Operation of the mobile station

Fig. 31 is a block diagram of the operation of the mobile station during a transmission service.

The measurement unit of the mobile station 4 sends a notification of the reception field strength, or the like, the source base station via a measurement report (step 151). After that, the mobile station 4 waiting for the HO command from the source base station 1a, and after receiving the HO command (step 152) achieves synchronization with the target base station 1b using alarm L1/L2 (step 153),and after as synchronization has been reached, sends a completion report transmission service on the target base station 1b (step 154), then in the case where the packets are received from the target base station 1b, the mobile station 4 performs the reorder process (steps 155 160).

In other words, when the control unit of the mobile station accepts a lower-level packets from the target base station 1b, the control unit generates the data of the RLC SDU and delivers these data RLC SDU (PDCP PDU) in block reorder (step 155). Block reorder checks whether there are any missing sequence numbers (step 156), and when the missing serial numbers no serial numbers are sequential, delivers data PDCP SDU obtained by removing the header from the data of RLC SDU (PDCP PDU)on upper level (step 160). However, when there is a missing sequence number, the control unit instructs the unit reorder to save the data RLC SDU (PDCP PDU). In this way, the controller can reorder stores the data PDCP PDU (step 157) and checks to see if there were data RLC SDU (PDCP PDU)having a continuous sequence numbers (step 158). When they are taken the data of RLC SDU (PDCP PDU)having a continuous sequence number, block reorder delivers data PDCP SDU obtained by removing the header from the data of RLC SDU (PDCP PDU), on top of UD is Yan, and delivers the PDCP PDU data obtained by removing the header from the data stored PDCP PDU, to the top level (step 160).

However, at step 158, when data were not taken RLC SDU (PDCP PDU)having a continuous sequence number, block reorder tracks have expired if a given amount of time (step 159), and when such a specified amount of time has not expired, repeating the process from step 157; however, when the specified time has expired, the unit reorder delivers data PDCP SDU obtained by removing the header from the data stored PDCP PDU, to the top level, even if the sequence numbers may not be continuous (step 160).

• Problems

In the LTE communication system, there are the following problems when running forward packets during transmission services. That is, as described above, when performing the transmission service in the LTE communication system, is the process of intercepting packets for the mobile station, which remain on the source base station 1a, and the packets are forwarded to the target base station during this process interception. However, in the management of the transfer described above, if the time-out value of the target base station 1b is small, the target base station 1b begins sending packets received from the master station regardless of whether or not been forwarded to all Pak is s, therefore, a problem arises in that the packets that have not yet been forwarded, discarded. On the other hand, if the time-out value is high, there is a problem in that the target base station 1b cannot send packets received from the master station, until then, until it timed out, even if all of the packets can be transmitted, so there is a transmission delay. In other words, in the traditional management transfer, there is an increase of packet transmission delays and poor performance, which make it impossible to support high-quality communication immediately before and after the transfer service.

As the first prior art has a way of notifying the target base station of the last packet that must be forwarded from the source base station (refer to Samsung, "Method for releasing resources in the source ENB during transmission service ("Method to Release Resources at the Source ENB During Handover") R3-061032, RAN3#53, September 2006). When a shipment is delayed, the target base station, which was notified about the latest service may transmit packets received from the master station, starting the sequence numbers of these packets with the sequence number of the last packet +1. In addition, by comparing sequence numbers of packets that are forwarded from over the new number of the last packet you can kill the waiting time and to detect the end of the shipment with optimal temporal reference. However, in the case in which the package is removed at the time of shipment, the target base station will be unable to accurately detect the last package.

Moreover, as the second prior art, there is a mobile communication system for enabling high-speed transfer of packet data without any data loss during transmission service between base stations during high-speed packet communication (refer to publication No. JP2004-282652A Japan patent). When the transfer occurs in this mobile communication system, the source base station transmission service transfers (forwards) packet data to the target base station transmission service. However, there is an increase in the latency of communication, due to the reordering by the mobile station, and no improvement in degraded performance.

Moreover, as the third prior art, there is a way in which the target base station skips packets sent from the master station without waiting for the arrival of transmitted packets (refer to application No. 2006-086537A patent Japan). In this way, by distinguishing packets to the e taken from the source base station, from packages, which are taken from the master station, it is possible to transfer, in which packets jump sequence. However, it is necessary that the mobile station had two functions, sequence control and its management becomes complicated.

Taking into consideration the above-mentioned problems, the objective of the present invention is to quickly transfer the packets that are sent from the master station (for example, a device that is different from the source base station, which sends the data (packets) to the target base station to the target base station, the mobile station.

Another objective of the present invention is to properly reorder forwarded packets, even when there is only one function of the precedence constraints, and even when packets are forwarded from the source base station, mixed with packets that are sent from the master station, by removing packages that are sent from the master station, as precedence constraint.

The provision of the items described in the variants of implementation, which are not described in the prior art, can also be considered as an objective of the present invention. Preferably, these elements are necessary to obtain advantages that cannot be obtained with p is exectuion technology.

The INVENTION

• Method reorder

Way to reorder the present invention is a method for reordering data being sent (e.g., packets), in which added information (such as numbers)that indicate the sequence of packets from the target base station, mobile station, and permutations of the data (packet) to the mobile station according to the information about the order.

In the method reorder the present invention, the target base station maps the distinctive information, which enables us to distinguish data that is forwarded from the source base station, from data that is not obtained via the source base station, with the data sent to the mobile station, and transmits distinctive information with the data from the target base station to the mobile station. Preferably, in the process of rearranging, the mobile station is characterized by data transmitted from the base station, the data is not received via the source base station, based on the distinguishing information. Moreover, preferably, the data that is received via the source base station, data are taken from the gateway device. Moreover, preferably, the data that is sent to the mobile station, ahadada in the form of packages.

Way to reorder the present invention, comprising: a step forward packets that have not yet been sent to the mobile station, or data for which the response confirmation of correct reception was not adopted with the mobile station, the target base station from the source base station; and sending these data to the mobile station from the target base station, and sending data taken from the master station, the mobile station; a step, in the case of sending data received from the master station with the order to jump, supply data, information indicating that data is to jump, then send the data from the target base station to the mobile station; and a step of selecting data from a jump, which are not subject to reorder, and the process of ordering on the data, which are subject to reorder.

Another way to reorder the present invention includes: the step of sending data that have not yet been sent to the mobile station, or data for which the response confirm adequate reception was not accepted from the mobile station to the target base station from the source base station; a step of sending the data that is forwarded from the source base station before after a specified period of time, and given the s, taken from the master station from the target base station to the mobile station; a step of discarding data that is forwarded from the source base station after the end of the first period of time; a step of adding information to the data to verify that the data is the last data that are subject to reorder, from among the data, which were adopted before the end of the first period of time, and add information to other data that is sent immediately after the data, and sending data from the target base station to the mobile station; and the implementation phase of the process reorder until while not the end of the second period of time, and when data, which contain the above information, accepted, complete the process of rearranging, even if the second time period has not yet ended.

Way to reorder described above, preferably, also includes: a step of issuing information about packages, indicating that the packages are packages with a jump, when sending packets to the mobile station, which were adopted from the gateway with the order to jump, and send packets to the mobile station from the target base station; and a selection step of those packages with the jump, which are not objects reorder, and implementation of% the SSA reorder over the packages which are objects rearrange, to the mobile station.

• Communication system

The present invention is a communication system in which data (e.g., packets)to which you have added information indicating the sequence of data sent from the target base station, mobile station, and rearrange data in numerical order to the mobile station.

The communication system according to the present invention includes a mobile station, the source base station that communicates with mobile station to send the service and the target base station that communicates with the mobile station after the transmission of the service; where (1) the source base station, comprising: a buffer that stores the data that were taken from the master station; a data transfer module that transfers data stored in the buffer, the mobile station; and a control unit that transmits data that was not sent to the mobile station to perform a sequence of transmission service, or data, for which the response confirmation of correct reception was not adopted with the mobile station, the target base station; (2) the target base station includes: a buffer that stores the data that are taken from the source base station during execution of a sequence of transmission service, and the data is, taken from the master station; a control unit that performs control so that the data taken from the source base station, preferably send the mobile station, and when sending data to the mobile station, taken from the master station with the order to jump, adds information to the data to indicate that data is to jump; and a transmission unit that transmits data to the mobile station; and (3) the mobile station includes: a buffer that stores the data that are taken from a base station; and a control block reordering, which selects the data not reorder, and performs the reordering on the data, which are subject to reorder.

Another communication system of the present invention, comprising: a mobile station, the source base station that communicates with mobile station to send the service and the target base station that communicates with the mobile station after the transmission of the service; where (1) the source base station comprising: a buffer that stores data received from the master station; a data transfer module that transfers data stored in the buffer, the mobile station; and a control unit that transmits data that is not sent to mobile is the first station to run a series of transmission service, or data for which the response confirmation of correct reception was not accepted from the mobile station to the target base station; (2) the target base station, comprising: a buffer that stores the data that are taken from the source base station during execution of a sequence of transmission service, and the data taken from the master station; a control unit that realizing the control to send the data that is forwarded from the source base station before the end of the first specified period of time, the mobile station, preferably as object reorder, and adds information to the data to specify that the data is the last data received as the object reorder before the end of the first specified period of time, or adds information to other data, which is transmitted immediately after the data, and sends the data from the target base station, mobile station, and discards data that is forwarded from the source base station, after the first predetermined period of time has ended; and a transmission unit that transmits data to the mobile station; and (3) a mobile station, comprising: a buffer that stores data that is received from the base station; and a control block reordering, to the th performs reordering until while not the end of the second specified period of time, and when taken data, which contain information identifying that the data is the last data that are subject to reorder, or when taken data, which contain information indicating that the last data that are subject to reorder already been accepted, completes the process of rearranging, even if the second predetermined time period has not yet ended.

• Base station/mobile station

Another form of the present invention is a base station and a mobile station, which form the first or second communication system.

BRIEF DESCRIPTION of DRAWINGS

Fig. 1 is a drawing illustrating a first variant embodiment of the invention.

Fig. 2 shows an example of the format of packet PDU PDCP.

Fig. 3 is a drawing illustrating packet processing at the level of the PDCP layer and the RLC sequence before transmission service.

Fig. 4 is a drawing illustrating packet processing at the level of the PDCP layer and RLC during the transfer sequence of service.

Fig. 5 is a drawing showing the construction of the base station.

Fig. 6 is a drawing showing the construction of the mobile station.

Fig. 7 is a block diagram of the functioning of the target base station in the first embodiment of the invention.

Fig. 8 is a block diagram of the operation of the source base station in the first embodiment of the invention.

Fig. 9 is a block diagram of the operation of the mobile station in the first embodiment of the invention.

Fig. 10 is a flowchart of a process for reordering by the mobile station.

Fig. 11 is a drawing illustrating a second variant embodiment of the invention.

Fig. 12 shows an example of the format of packet PDU PDCP.

Fig. 13 is a drawing illustrating packet processing at the level of the PDCP and RLC level during transmission of service (1/2).

Fig. 14 is a drawing illustrating packet processing at the level of the PDCP and RLC level during transmission of the service (2/2).

Fig. 15 is a block diagram of the functioning of the target base station in the second embodiment of the invention.

Fig. 16 is a block diagram of the operation of the mobile station in the second embodiment of the invention.

Fig. 17 shows an example of attaching the sequence number SN to the data PDU PDCP and performing the notification through the data plane (the plane of the U).

Fig. 18 shows an example of attaching the sequence number SN to the data PDU PDCP and performing the notification through the plane of the U, as well as the implementation of message sequence numbers through a plane C.

Fig. 19 is a drawing showing the sequence of transfer service according to Fig. 18.

Fig. 20 shows an example when there is absolutely no data PDCP PDU to send.

Fig. 21 is a drawing explaining the interception of communications in the time of the transfer service.

Fig. 22 is a drawing illustrating a transfer service in the LTE communication system.

Fig. 23 is a drawing explaining a procedure of the transmission service, which is currently anticipated to LTE communication system.

Fig. 24 is a first drawing illustrating the process of reordering by the mobile station.

Fig. 25 is a second drawing illustrating the process of reordering by the mobile station.

Fig. 26 is a third drawing illustrating the process of reordering by the mobile station.

Fig. 27 is a fourth drawing explaining the process of reordering by the mobile station.

Fig. 28 is a drawing explaining the configuration of protocols between the mobile station and the network.

Fig. 29 is a block diagram of the operation of the source base station during a transmission service.

Fig. 30 is a block diagram of the functioning of the target base station during a transmission service.

Fig. 31 is a block diagram of the process of the method for a mobile station during a transmission service.

DESCRIPTION of the PREFERRED embodiments

(A) theoretical basis of the present invention

With the present invention the above problems are solved by providing opportunities for base station and mobile station to perform the following two procedures.

Procedure 1: When there is a delay in the sending of the data from the outcome of the th base station after transmission of the service, the target base station sends data that has already been taken from the master station without waiting for reception of the delayed data transfer (with jump), and the mobile station is able to recognize the data. In other words, the distinguishing information is included in, attached to or matched with the data in order to recognize that the data is data with a jump, and transmitted data is transmitted using the control channel.

Procedure 2: When found, that there was a transfer from the jump, the mobile station selects data from a jump, which are not subject to reorder and keeps them in the buffer, and the mobile station waits for the arrival of data packets forwarded from the source base station. In other words, the mobile station is characterized by data that is transmitted from the source station, the data is transmitted without passing through the source base station, using the distinguishing information, and performs a reordering of the data that is transmitted from the source station.

In the traditional way, when sending data from the source base station to the target base station is delayed, the mobile station must wait for the transmission of data that is sent from the master station to the target base station. Therefore, by waiting until the PRS, while not expired prescribed amount of time (timeout), came to this data from the source base station, the problem arises for the reason that increases the delay and degrades performance. However, as described above, through the implementation of data you can quickly jump to send data, which were taken from the master station, mobile station, even when the transfer (sending) data from the source base station is delayed, and when the action so the delay is reduced. Therefore, when compared with the traditional method, the present invention is able to maintain a high quality connection immediately before and after the transfer service.

(B) the First option exercise

Fig. 1 is a drawing illustrating a first variant of the invention, and in this embodiment explained a case of adding information about the order in each package, but you can also use the data having the specified size.

Here it is assumed that before the transfer of the packets n-5 through n stored on the source base station 11a, and of these packages with n-5 n-2 transmit mobile station 14, however, the packets n-1 and n does not transmit the mobile station 14. For example, the packets n-1 and n has arrived at the source base station 11a after was the connector is of inane line radio communication between the source base station 11a and the mobile station 14, therefore, these packets n-1 and n could not be transmitted to the mobile station 14. Besides from the packet, which was transmitted to the mobile station 14, it is assumed that mobile station 14 is not able to correctly receive the packets n-5 and n-3 (NACK), but was able to correctly receive packets n-4 and n-2 (ACK). Therefore, the mobile station 14 stores the packets n-4 and n-2, but does not store the packets n-5 and n-3.

When the transfer occurs in this state, the source base station 11a transfers (forwards) the packets n-5 and n-3, which could not properly be taken by the mobile station 14, and the unsent packets n-1 and n to the target base station 11b. Packet forwarding will be explained below, but the invention is not limited to this example.

In addition, after the transfer service, the master station 12 transmits two packets of m by m+1, which are intended for the mobile station 14, the target base station 11b. It is assumed that the transfer (forwarding) packets n-5 n is delayed.

When such a target base station 11b receives packets m and m+1 from the master station 12 before the packets n-5, n-3, n-1 n forwarded from the source base station 11b, the target base station 11b adds code F to ID jump in packets m and m+1, which is taken from the master station 12, and sends these packets to the mobile station 14 first (transfer from the jump).

Mobile station 14 save the remains packages taken from the base station and to which you have added code F to ID jump in the buffer BF2 and exclude these packages as objects of the reorder process. In (A) in Fig. 1 shows the state in which the mobile station 14 stores the packets m and m+1 in the buffer BF2, and stores the packets n-4 and n-2, taken prior to transmission service, in the buffer BF1.

Then the target base station 11b transmits the packets n-5, n-3 and n-1 to n, which is forwarded from the source base station 11a, the mobile station 14. Mobile station 14 stores the packets n-5, n-3 and n-1 to n received from the target base station 11b, the buffer BF1, and then performs the process of ordering for these packets, which are received after a transmission service, and packet n-4 and n-2, which were adopted prior to the transfer of servicing (see (B) in Fig. 1), and delivers the packets to the upper level in the order continuous sequence numbers.

In the case where the mobile station 14 does not accept packages that have continuous ordinal, even when expired prescribed time, the mobile station ends the process of rearranging and rearranges the sequence of packets that have already been taken, and delivers them to the upper level.

Mobile station 14 then delivers the packages that have been added to the ID code F jump, in order to the top level.

During the forward the original host of a hundred is tion may send the complete package to the target base station or can transmit data only parts of the package with a portion of the user data). Preferably, information about the order is added to the sent data.

In addition, in Fig. 1 sequence number (sequence) m, m+1 is assigned to the packets, which are transferred from the jump, however, the target base station 11b can assign arbitrary ordinals can add numbers that overlap with sequence numbers that are added to the forwarded packets, and can add numbers that do not overlap.

• Code ID jump

As the code example F the ID of the jump, which is added to the packets using a 3-bit field 'type' ('type'), which is included in the PDCP PDU header. In other words, in this field type, the new type is defined as ID F ID jump, and this room type is added to the package for which transfer is carried out with the jump. Fig. 2 is an example of the format of the PDCP PDU, where (A) is an example of the format when there is no title, (B) is an example of the format when the sequence number of the PDU PDCP not added, and (C) and (D) are examples of the format when the sequence number of the PDU PDCP added. Format (C) and (D) field type and field PID defined in the header HD, where the type field specifies the type of PDU PDCP. Field PID is a field that indicates the type of header compression, which is used for the data included in the data portion. In the field of type 'type=000' and 'type=001' is already regulated, but the types 'type= 010 to 111' not reg is amintirea and are unused. So 'type=010' is used as a non-type (code ID jump) to distinguish between PDCP PDU for which transfer is carried out with the jump.

• Processing level PDCP and RLC level before and after the control transfer

Fig. 3 is a drawing illustrating packet processing level PDCP and RLC level before transfer. The source base station 11b stores the packets n-5 n-2 level PDCP buffer ((A) in Fig. 3), and at the level of the RLC packets are divided into the data set, as shown in (B), then the ordinal numbers I, I+1, I + 2,..., I+6 level RLC added to the divided data, and data (RLC PDU) send the mobile station 14. Before transfer of the mobile station implements the precedence constraint for level PDCP using RLC SDU (PDCP PDU and PDU PLC at the RLC level. In (C), (D) in Fig. 3, mobile station 14 is incorrectly received divided data I, I+4 and I+5, or, in other words, the packets n-5 and n-3, however, the mobile station 14 is correctly received packets n-4 and n-2. Before transfer of the mobile station 14 controls the sequence for level PDCP using RLC SDU (PDCP PDU and PDU PLC level RLC, however, after the transfer service, it is regulated that the RLC level must be initialized. Therefore, processing for sequence control is moved to the level of the PDCP, and mobile station 14 performs a follower of the awn transmission service at the level of the PDCP.

During reorder mobile station 14 starts a timer to determine when the reordering is terminated.

The arrival of packets m and m+1, which is taken from the master station 2 is early, so ID jump is attached to these packets m, m+1, and they are sent to the mobile station 14 first (transfer from the jump). Mobile station 14 saves packets that are received from the base station and to which is attached the code ID jump in buffer B2 (see Fig. 1) and removes them as objects of the reorder process. After that, the mobile station 14 performs a process to reorder the packets n-5, n-3 and n-1 through n, which were adopted from the target base station 11b, and the packets n-4 and n-2, which were adopted prior to the transfer service, and then delivers the data to the upper level.

When the specified time TM timer has expired, the mobile station 14 ends the process of rearranging and sends the packets that were taken on the top level, even if there may be any missing packages.

• Management

Fig. 4 is a drawing illustrating packet processing level PDCP and RLC level prior to transmission service, and detail displays the control screen.

Taking into account the fact that arrives to the amount of data exceeds the allowable limits, the mobile station 14 forms nutrione buffer size and during reorder, carries out the following control window. In the example shown in Fig. 4, the left edge of the window WD is first n-5 expected data, and the right edge of the window is selected according to the number of valid data (the buffer size of the window), and is taken equal to n-2. Mobile station 14 does not use window treatment to packets that have been added code F ID jump.

In the initial state (state (0) of the window), when the mobile station 14 receives the expected package (n-5) and executes a process of rearranging, the window state becomes as shown in (1). Therefore, the mobile station 14 delivers the expected package (n-5) and package (n-4), which follows the packet (n-5), on the upper level. After that, the status window is the same as that in (2), and in this state, when the mobile station 14 receives the expected package (n-3) and performs the process of rearranging, the window state becomes as shown in (3). Therefore, the mobile station 14 delivers the expected package (n-3) and package (n-2), which follows the packet (n-3), on the upper level. The state of the window then becomes as shown in (4), and in this state, the mobile station 14 is waiting to receive packets (n-1), and n, and when the packets are received within a predetermined period of time T_Mmobile station 14 then delivers p. the chum salmon to the upper level. However, when the mobile station 14 does not accept the packet (n-1) and n within a predetermined period of time T_Mmobile station 14 delivers packages, starting with the m package, which is stored in the buffer BF2, on the upper level and proceeds to the normal control, how to transfer service. As explained above, by removing packages with the jump from the reorder process and implementation management window, as described above, it is possible to perform processing by rearranging only the packets n-5 n.

When this control window, when a packet is received that has a sequence number that is smaller than the sequence number on the left edge of the window, the mobile station 14 removes this package. Moreover, when the package is received that has a sequence number that is greater than the sequence number on the right side of the window, the mobile station 14 takes the sequence number of this package, making it a serial number on the right side of the window, and change the sequence number on the left side of the window according to the size of the buffer window, along with the fact that simultaneously delivers the packets that are out of range of the window and which were taken on the top level.

If this window treatment also applies to packets with a jump at the time when the package is received m, the state of the window is such that the left side of the window is n-2, and the right with Orono window is m. In this case, the mobile station 14 stops to wait for reception of packets n-5 and n-3 that have not yet been adopted, and delivers the received packets n-4 and n-2 on the upper level. In addition, the mobile station selects the sequence number of the right side of the window, equal to m, and selects the sequence number of the left side of the window equal to the number n-1, which is determined according to the size of the window, then after that waits for the arrival of packet n-1, packet n packet n+1,... package m-1. However, since the packet n+1 packet m-1 are packages that do not actually exist, the mobile station is useless waits for the reception of these packets, and the violation occurs in the processing of packages.

• Design of a base station

Fig. 5 is a drawing that shows the construction of the base station and indicates the buffer block, the block scheduler, block the transmission/reception control unit.

The buffer block 21 is a memory for storing packets that come from the master station, and packets that are sent from the neighboring base station (source base station). In Fig. 5 physically there are two buffer 21a, 21b, however, also possible to design physically, there is only one memory, and this one memory is used by dividing it by using the software.

The block 22, the scheduler selects the mobile station from among the many support the existing mobile stations, you should make a radio broadcast, selects packets for such a mobile station that is stored in the block buffer, and sends them to the block 23 of transmission/reception. Unit 23 of the transmission/reception encodes and modulates the packets that entered from the block scheduler 22, and transmits the actual data using radio communications. In addition, the unit 23 of the transmission/reception receives and demodulates the control signals and various data, which are sent from the mobile station.

Block 24 contains a control unit 24a of the control buffer unit 24b management HO and block 24c of the control measurement. Block 24a buffer management manages the various packages that are stored in the buffer 21. When the data is intercepted during transmission services, the unit 24, the control transmits at least the packages that are stored in the block buffer 21b, which was not received acknowledgement (ACK)indicating that the packages were passed correctly from the mobile station to the target base station 11b.

On the other hand, when the arrival of packets that are forwarded from the source base station 11a, has been delayed due to the interception of data and transmission jump is carried out for packages that are taken from the master station 12, 'type=010' is entered in the type field of the header of those packages that need to be jump.

Unit 24b management HO performs control plumage is of ACA service as explained in Fig. 23, and the block 24c of the control measurement collects measurement data sent from a mobile station, such as CQI (channel quality of the radio communication mobile station, and the like.

• Design mobile station

Fig. 6 is a drawing showing the construction of the mobile station and the block 31 of the transmission/reception unit 32 of the buffer unit 33 reorder and control unit 34. The block 31 of the transmission/reception transmitting packets and control information to or receives packets and control information from the base station. When the data of RLC PDU can not be created from low-level packets that were accepted, the block buffer 32 holds these low-level packets up until these data RLC PDU can not be created, and after RLC PDU data is created, the block 32 buffer removes the header and delivers the data in the block 33 reorder as data RLC SDU (PDCP PDU). The block 33 has a reorder function for permutation data PDCP PDU in the order of sequence numbers and delivers the data to the upper level. When discovered missing sequence number PDU PDCP, block 33 reorder stores the data PDU PDCP following these data PDCP PDU in the internal memory up until not taken PDCP PDU data with the ongoing sequence number. However, when these data PDU PDC still not delivered after the CSOs, how has expired specified period of time, block 33 reorder stops the process of ordering and delivering all data stored PDCP PDU to the upper level. Moreover, the block 33 reorder controls the window so that the amount of data that is processed does not exceed the allowed number.

Block 34 contains a control unit 34a measurement unit 34b management reordering and block 34c control re-transmission. Unit 34a measurement measures the different types of measurement data, which is sent to the base station. For example, the block 34a measurement measures the quality of communication (information about the quality of the channel) of the mobile station. Unit 34b management reordering manage unit 33 reorder, and when there is a missing sequence number in the data PDCP PDU, which is retained by the block 33 reorder, block 34b management rearranging gives the command block 33 rearrange to expect the arrival of these data PDCP PDU having a continuing sequence number. Moreover, when a specified amount of time to wait to arrived the package has expired, the unit 34b management rearranging gives the command block 33 rearrange to stop the process of rearranging, and instructs the block 33 reorder to remove headers from all of the stored given the ies PDCP PDU and deliver these data to the upper level as data PDCP SDU, then sets the block 33 reorder in the state in which he is able to accept new data PDCP PDU. In addition, the unit 34b management finds the maximum sequence number among sequence numbers, which were adopted until such time as the sequence number on the right edge of the window, and determines and sets the sequence number of the left edge of the window, taking into account the size of the window. Here, in the case where there is a package that has already been adopted, which has a sequence number that is smaller than the sequence number on the left edge of the window, the packet is immediately delivered to the upper level. When there is a management re-transmission, the unit 34c control re-transmission sends a request signal re-transmission to the base station through the power transmission/reception along the route indicated by the dotted line.

• The functioning of the target base station

Fig. 7 is a flowchart showing the operation of the target base station in the first embodiment of the invention.

When the unit 24b transmission control service to the target base station 11b receives the HO request from the source base station 11a (which includes the ID of the mobile station, information about QoS and the like) (step S201), the unit 24b transmission control service determines whether to permit the mobile station (step 202). To the Yes admission the mobile station is not allowed unit 24b transmission control service carries out the processing (step 213) and completes the control transfer.

On the other hand, in the case in which the block 24b transmission control service allows the admission of the mobile station, unit 24b transmission control service returns a response message to the HO request to the source base station 11a (step 203). Then the target base station waits for packets that are forwarded from the source base station 11a. When packets arrive from the source base station, the buffer 21 stores them (step 204).

When the unit 24b transmission control service receives the completion report HO with the mobile station 14 (step 205), the unit 24b transmission control service then sends a completion report HO on the leading station 12 (step 206). After receiving the completion report HO master station 12 changes the transmission path for packets from the source base station 11a to the target base station 11b and returns a response of completion of the HO to the target base station 11b. After the unit 24b transmission control service to the target base station 11b receives the response complete HO from the master station 12 (step 207), the unit 24b transmission control service sends a command to the block 22 of the scheduler to start packet transmission (step 208).

Then the block 22, the scheduler checks whether the transfer persocom packet (step 209), and when the transmission jump is not required, the block 22, the scheduler sends the first packet, which is forwarded from the source base station 11a, the mobile station 14 (step 210). However, when forwarding packets from the source base station 11a is delayed and you want to transfer with jump packs, block 22 scheduler performs transmission with jump packs, which were taken from the master station 12.

In order to perform the transfer, jump, block 22 scheduler specifies the number type fields type of packages which will be sent with the jump, 010 (type=010), so that mobile station 14 was able to recognize that the packages are packages with a jump (step 211), then, after that, sends packets to the mobile station 14 (step 210).

Simultaneously, the unit 24b transmission control service sends a release of resources source base station 11a (step 212), then carries out the processing (step 213) and completes the control transfer.

• Operation of the source base station

Fig. 8 is a block functional diagram showing the operation of the source base station in the first embodiment of the invention.

In Fig. 8, when the block 24c of the control dimension of the source base station 11a receives the report measured the s, which indicates status information received from the mobile station 14 (step 251), block 24a transmission control service determines is necessary or there is no transfer of (HO) on the basis of such information on the state of reception (step 252), and when the transmission service is not needed, returns to the beginning.

However, when the unit 24b transmission control service determines that the transfer of HO desired, the unit 24b transmission control service selects a target base station 11b according to the contents of the measurement report and sends the request to transfer service to this target base station 11b (step 253).

After that, when accepted (step 254) response message HO, which is sent from the target base station 11b, block 24b management HO sends a message command HO mobile station 14 (step 255), and instructs the unit 24a of the control buffer to forward packets stored in the buffer 21b, to the target base station 11b. Therefore, using the route indicated by the dashed line, block 24a of the control buffer forwards the packets stored in the buffer 21b and which are not sent to the mobile station 14, or packages that were not taken correctly (NACK packets) mobile station, the target base station 11b (step 256). After the liberating message of the resources taken from the centre of the left base station 11b (step 257), block 24a management HO provides the resources are released (step 258).

• Operation of the mobile station

Fig. 9 is a flowchart showing the operation of the mobile station.

Unit 34a measuring mobile station 14 notifies the source base station 11a on the status of the reception using the measurement report (step 271). The control unit 34 then waits for the command message, HO was sent from the source base station 11a, and when the command message, the HO is accepted (step 272), the block 24 management establishes synchronization between the mobile station and the target base station 11b using alarm L1/L2 (step 237), and after the synchronization is established, sends a completion report transmission service on the target base station 11b (step 274). After that, the control unit 34 checks whether the received packet service with the jump, or, in other words, whether the type number package type=010 (step 275), and when the package is a package with a jump, the control unit 34 deletes the packet as the object reorder and stores the packet in the buffer 32, and then, once expired the specified period of time, remove the header and delivers the packet to the upper layer as a package PDCP SDU (step 276). On the other hand, when the packet is not a packet with a jump, block 24 performs control perepa adouane and rearranges the sequence according to the sequence number, then removes the header from the rearranged packets and delivers them to the upper level as packets PDCP SDU (step 277).

Fig. 10 is a block diagram of the process of the method, showing the reorder process by the mobile station.

When the block 31 of the transmission/reception of the mobile station 31 receives more low-level packets from the target base station 11b (step 301), the unit 34b management reorder checks, is it possible to create RLC PDU data (step 302), and when the RLC PDU data cannot be created, checks, expired if a given amount of time (step 303), and when a specified amount of time has not expired, retains more low-level packet in the buffer 32 (step 304), then again carries out the processing from step 301. When you create a data PDU RLC impossible, although a specified amount of time has expired since adopted a more low-level package, such lower-level package is removed from the buffer (step 305).

On the other hand, at step 302, when you can create RLC PDU data using the received lower-level package, these data RLC PDU is delivered to the block 33 reorder as data RLC SDU (PDCP PDU) (step 306). After receiving data RLC SDU (PDCP PDU) unit 33 reorder checks whether there is a missing sequence number (step 307), and when the missing sequence number is not, and the sequence numbers are continuous is mi, block 33 reorder removes the header of this data RLC SDU (PDCP PDU) and delivers them to the upper level as a PDCP SDU (step 311). However, when the missing sequence number is, the block 34b management rearranging gives the command block 33 reorder save PDCP PDU data (step 308). Therefore, the block 33 reorder stores the data RLC SDU (PDCP PDU) and checks whether the data is taken RLC SDU (PDCP PDU) from continuing sequence number (step 309). After receiving data RLC SDU (PDCP PDU) from continuing sequence number block 33 reorder removes the data header RLC SDU (PDCP PDU) and delivers them to the upper level as data PDCP SDU, and then also delivers stored PDCP PDU as SDU PDCP on the upper level (step 311).

Moreover, at step 309, when the data of the RLC SDU (PDCP PDU)having a continuing serial number is not accepted, the block 33 reorder tracks, expired whether a given period of time T_M(step 310), and when the preset time period has not yet expired, repeats the processing from step 308; however, when a given period of time T_Mhas expired, block 33 reorder removes the header data stored PDCP PDU and delivers them to the top level, even if the sequence numbers are not continuous (step 311).

With the first embodiment of the invention, as described above, packets from leading the station 12 to the target base station 11b, can be transmitted to the mobile station 14 as packages with jump without delay, so you can eliminate the time delays in the data and improve the overall system performance. Moreover, the mobile station 14 removes packages with the jump in quality control objects by rearranging (control order) and manages the order of the above packets other than packets with a jump, and delivers those packages to the top level in the order of sequence numbers. As a result, the mobile station is able to control the order of the packets, even when there is only one function control sequence.

(C) a Second variant implementation

In the first embodiment, the mobile station 14 has implemented a process for reordering during a predetermined period of time TM and stopped the process reorder when this specified time period TM has elapsed (see step 310 in Fig. 10). In the case when the specified period of time TM has elapsed, even if taken all of the packets that were forwarded from the source base station 11a of the target base station 11b, the mobile station 14 continues the process of reordering. Therefore, in the second embodiment of the invention, so that mobile station 14 was able to recognize the last packet that t is aetsa the process object reorder, the target base station 11b adds the identifier in prescribed package (last packet) and transmits the packet to mobile station 14, and after reception of this last batch of mobile station 14 immediately terminates the process of rearranging, even if the time TM has not expired. Fig. 11 is a drawing illustrating a second variant of the invention, in which it is assumed that the packets n-5 through n stored on the source base station 11a before the transfer, and of these packages with n-5 n-2 transmit mobile station 14, however, the packets n-1 and n does not transmit the mobile station 14. For example, the packets n-1 and n profit after line of radio communication between the source base station 11a and the mobile station has been disconnected, so these packets n-1, n were not sent to the mobile station 14. In addition, it is assumed that, of the packets that were sent to the mobile station 14, the packets n-5 and n-3 were not accepted correctly by the mobile station 14 (NACK), and that the packets n-4 and n-2 have been adopted correctly (ACK). Therefore, the mobile station 14 stores the packets n-4 and n-2 and store the packets n-5 and n-3.

When the transfer occurs in this state, the source base station 11a sends the packets n-5 and n-3 that were not properly taken mobile station 14, and the unsent packets n-1 and n of the target base station 11b. Besides leading stations is 12 sends two packets of m by m+1 target base station 11b after the transfer service. It is assumed that the forwarding of packets n-5, n-3 and n-5 n is delayed.

When the target base station 11b receives packets m and m+1 from the master station 12 before the packets n-5, n-3 and n-1 n forwarded from the source base station 11a, the target base station 11b adds code F to ID jump in packets m and m+1, which are received from the master station, and sends them to the mobile station 14 first (transfer from the jump). Mobile station 14 stores the packets received from the base station with the added code to the ID of a jump in the buffer BF2 and remove them as objects of reordering. In (A) in Fig. 11 shows the state in which the mobile station 14 stores the packets m and m+1 in the buffer BF2, and stores the packets n-4 and n-2, which was made prior to the transfer of service, the buffer BF1.

The target base station 11b sends packets that are forwarded until then, until the timeout is reached T_M(called latency), the mobile station 14, and when the timeout expired, the target base station 11b discards any packets that can be forwarded. Therefore, the target base station 11b receives the packets n-5, n-3 and n-1, which was forwarded from the source base station 11a before the timeout, and stores them in the buffer BF, and then sends the packets one by one mobile station 14. In addition, the target base station 11b package n from the source base station 11a, however, the waiting time ended before the pack-n could be sent to the mobile station 14. In this case, the target base station 11b adds the ID (L) pack-n, to indicate that it is the last packet forwarded from the source base station, and sends the packet n mobile station 14.

Mobile station 14 stores the packets n-5, n-3, n-1 and n, which were taken from the target base station 11b, the buffer BF1, and, as shown in (B) in Fig. 11, executes a process of rearranging to rearrange these packs and n-4 and n-2, which were adopted prior to the transfer service. Moreover, after the discovery of the pack-n-added ID (L), mobile station 14 determines that the shipment has ended, so delivers the packages that have been reordered, on the upper level and completes the process of rearranging, even if the set period of T_Mtime to reorder not ended.

The above-described case in which the time T_Wwaiting ends before sent the pack-n, however, T_Wexpectations can end after the pack-n was sent to the mobile station. In this case, the target base station 11b adds the ID (L) package m+2, which will be adopted from the master station 12 indicating that it is the last packet, and sends p the ket m+2 mobile station 14. After receiving the last packet, to which was added this ID (L), mobile station 14 determines that the shipment has ended, and immediately terminates the reordering, even if not over a given period of time T_Mto reorder.

Moreover, the packets n-5 and n-3 accept forwarded, however, the time T_Wexpectations may end up on stage before taken the packets n-1 and n. In this case, the target base station 11b can add the ID (L) in the pack-n-3, indicating that it is the last packet, and sends the packet to mobile station 14. Mobile station 14 detects the latest package, which adds this ID (L), and ends the process reorder.

• Code L the ID of the last packet

To add to the package ID L (ID of the last packet that identifies that the packet is the last packet using a 3-bit field 'type', which is included in the PDCP PDU header. In other words, a new type number specified in this field 'type' as code L the ID of the last packet, and the type number is assigned to the first packet that should be sent after the ending time T_Wexpectations. Fig. 12 shows an example of the format of the PDCP PDU, where (A) is an example of the format without header, (B) is an example of a format in which a sequence number PDU PDCP not on the contains list of, and (C) and (D) are examples of the format in which a sequence number PDU PDCP added. In the format shown in (C) and (D), field type and field PID defined in the header HD, where the type field specifies the type of PDU PDCP. For field of type 'type=000' and 'type=001' is already regulated, but the numbers of type 'type= 010 to 111' are not regulated and are unused. So 'type=011' is used as a non-type recognition package PDCP PDU (last batch), which should be sent first after the end of the time T_Wwaiting.

• Processing level PDCP and RLC level

Fig. 13 and Fig. 14 - drawings illustrating packet processing for level PDCP and RLC level after transfer service.

Fig. 13 shows a case where a code L the ID of the last packet is added to the pack-n, which is sent to the mobile station 14. In the first embodiment, during reorder, mobile station 14 starts a timer to determine the end of a reorder. Here, when the set time T_Mset to be a large value, the reorder process continues regardless of whether or not the package n the last forwarded packet, and packets cannot be delivered to the upper level until, until a given time T_M. However, in this second embodiment, after receiving the packet n (the last PA is ETA), to which was added the code L to the ID of the last packet, the mobile station 14 immediately ends reordering and delivers all of the packets PDCP PDU to the upper level.

When more than the allowed number of data arrives at the mobile station 14, the mobile station 14 controls the window during reorder. The left side of the window is n-5, which is a number that is expected to advance and the right side of the window is the value of the upper limit of the permissible amount of data (in the figure this quantity is n). However, the window processing is not applied to the packets 'type=010' (packages with jump), as in the first embodiment. Through the implementation of the processing so that you can reorder with the pack-n-5 to package n.

Fig. 14 shows a case where a code L the ID of the last packet is added to the packet m+2. At the moment, which adopted a package of m+2 (last batch), the mobile station 14 immediately ends reordering, although given time T_Mhas not yet been completed, and delivers all of the received packets PDCP PDU to the upper level. Moreover, in the case of the control window, the mobile station 14 performs the control box in the same manner as shown in Fig. 13.

• The functioning of the target base station

Fig. 15 is a block diagram showing the function is the W target base station in the second embodiment of the invention, where the former numbers are given to the steps that are the same as steps on the first version of the implementation shown in Fig. 7. Base station and mobile station according to this second variant implementation of the design shown in Fig. 5 and Fig. 6.

When the unit 24b transmission control service to the target base station 11b receives the HO request from the source base station 11a (which includes the ID of the mobile station, information about QoS, and so on), the unit 24b transmission control service manages the call is accepted on the basis of such information and determines whether to permit the mobile station. When the tolerance is not enabled, the unit 24b transmission control service performs post-processing and finishing management transfer (steps 201 to 202 and 213).

On the other hand, when the unit 24b transmission control service allows the admission of the mobile station 14, block 24b transmission control service returns a response message to the HO request to the source base station 11a and starts measuring the elapsed time. After that, the target base station 11b expects the packets forwarded from the source base station 11a and stores the packets in the buffer block 21 (steps 203 and 204).

In this state, after receiving the completion report HO with mobile station 14, block 24b transmission control services the project sends a completion report HO master station 12 (steps 205 and 206). After the master station 12 receives the completion report transmission service, the master station 12 changes the transmission path of packets from the source base station 11a to the target base station 11b and returns a response of completion of the HO to the target base station 11b. Unit 24b transmission control service to the target base station 11b receives the response complete HO from the master station 12, and then instructs the block 22 of the scheduler to start packet transmission mobile station (steps 207 and 208).

Then, the block 22, the scheduler monitors exceeded or not the elapsed time for a given period of time T_Wthen there is ended or not the waiting time (step 501), and when the waiting time has not ended, it checks whether to perform transmission with jump packs (step 209), and when this is not necessary, begins sending packets that were forwarded from the source base station 11a (step 210), preferably a mobile unit 14 through the block 23 of transmission/reception. However, when the shipment is delayed and you want to transfer with jump packs, block 22 scheduler performs transmission with jump packs, which were taken from the master station 12. In order to perform the transfer, jump, block 22, the scheduler sets the type in the type field in the header of the packet to be transferred from the lane is a Lope, in 010 (type=010), whereby the mobile station 14 is able to recognize that the packages are packages with a jump (step 211). After the unit 23 of the transmission/reception sends packets with a jump of a mobile station.

Simultaneously, the unit 24b transmission control service sends a release resources on the source base station 11a (step 212), then returns to step 501 to check the results of the timeout, and when the waiting time has not ended, it repeats the process from step 209.

On the other hand, at step 501, when the time T_Wthe wait is over, the unit 22 scheduler specifies the type of packet that will be transmitted immediately after the end of the timeout, '011'. In other words, the block 22 of the scheduler code adds L to the ID of the last packet to the packet which is transmitted directly after the end of the timeout, and transmits the packet (the last packet, the mobile station 14 (steps 502 and 503), then, after that, performs post-processing and finishing management transfer (steps 212 and 213).

At step 502, in order to be able to identify whether the last packet, to which was added the code L to the ID of the last packet, the packet that was forwarded from the source base station 11a, or whether the service, which was accepted on the master station 12, block 22 scheduler specifies the number type in '011' in the case of the first and specifies the type number '100' in the case of the latter. By execution of this mobile station 14, it becomes easy to carry out the process of reordering, as will be described later.

• Operation of the mobile station

Fig. 16 is a flowchart showing the operation of the mobile station, in which previous reference numbers are used for stages, which are the same as those in the block diagram of the operation shown in Fig. 98. Unit 34a measuring mobile station 14 uses the measuring report to notify the source base station 11a about the status of the reception. The control unit 34 then waits for the command message, HO was sent from the source base station 11a, and after receiving the message, the HO command sets the synchronization between mobile station 14 and the target base station 11b using alarm L1/L2, and after synchronization has been established, sends a completion report transmission service on the target base station 11b (steps 271 through 274).

After the control unit 34 checks whether the received packet service with the jump, or, in other words, the package having a type number type=010 (step 600), and when the package is a package with a jump, removes the packet from which the object rearranging the deposits and stores it in the buffer 32 (step 601).

On the other hand, when the packet is not a packet with a jump, the control unit 34 checks whether the received packet is the last packet, or, in other words, the package having a type number type=011 (step 602). In the case where the packet is not the last packet, the control unit 34 starts the process of rearranging and has the PDCP PDUs according to the ordinal, then creates a data PDCP SDU and delivers the data to the upper level (step 603).

The control unit 34 then checks the results of the current period T_Mtime (step 604), and when a given period of T_Mtime has not yet ended, the control unit 34 repeats the processing from step 600, and when a given period of T_Mtime has ended, the control unit 34 ends the process reorder, then removes the header from the packets RLC SDU (PDCP PDU)that have not yet been delivered to the upper level, creates data PDCP SDU and delivers these data to the upper level (step 605). Then, the control unit 34 delivers the packages that are not subject to reorder, on the upper level, and ends the processing (step 606).

However, at step 602, when the received packet is the last packet, the control unit 34 stops immediately the reorder process (step 607). Then, in the case in which the last packet is forwarded packet, the block 34 the Board creates a package PDCP SDU from this last packet and delivers the packet to the upper level, then stops reordered. When the last packet is a packet received from the master station 12, the control unit 34 stops immediately reordered and attaches the last packet to the last packet, which is not subject to reorder and stored in the buffer. After the control unit 34 delivers the packets that were not the object of reorderings on the upper level, and ends the processing (step 606).

As described above, with this second embodiment of the invention, the mobile station detects the end of forwarded packets, based on the ID of the last packet, giving the possibility to stop the process quickly reorder. Therefore, it is possible to eliminate time delays in the data and improve the performance of the whole system.

(D) a Third option exercise

Information about the order (sequence numbers n, m)that has been presented thus far, was the appropriate numbers for ease of explanation, but, in fact, it is information that is added to the base station.

As explained above, in the LTE communication system, the shipment is carried out by blocks of data PDCP SDU. So when was the shipment, it was impossible to send sequence number field from the source base station 11a of the target base station 11b, and it was necessary Uwe is omlete target base station 11b about the serial numbers, using some method.

In this embodiment, the source base station 11a notifies the target base station 11b of serial numbers along with the data PDCP SDU, and, on the basis of these sequence numbers, the target base station 11b adds a header that includes a sequence number to the forwarded data packets PDCP SDU, in this regard, create a package PDCP PDU (RLC SDU).

Fig. 17 is an example of a send sequence number PDU PDCP together with the data (packets) PDCP SDU through the data plane (the plane of the U). In Fig. 17 shows only the data of the PDCP SDU and serial numbers that accompany these data, however, PDCP SDU to be recognized as a bunch of packages that should be added to the control information (header information). Whenever a source base station 11a sends data PDCP SDU, the source base station 11a notifies the target base station 11b of the sequence number that follows the data PDCP SDU, using the format shown in Fig. 17, and, based on this sequence number, the target base station 11b adds a sequence number in the transmitted data (packet) PDCP SDU.

In other words, in the position shown in Fig. 17, the source base station 11a first sends a sequence number n-5 and the first data PDCP SDU through a plane U-plane data. Then, the source base station 11a of peresie the t sequence number n-3 and the following data PDCP SDU through a plane U-plane data. After you forward the following data PDCP SDU, which were taken from the master station 12, the source base station 11a similarly sends data PDCP SDU and their ordinal numbers n-1 and n to the target base station 11b through the plane of the U. On the target base station 11b through the receiving sequence number n-5, n-3, n-1 and n, which are reported through the plane of the U, it is possible to target base station 11b recognize the number as the sequence numbers for transmitted data.

Fig. 18 is an example of the source base station 11a, notifying the target base station 11b through the plane of the U sequence number of the PDU PDCP together with the corresponding PDCP SDU, and notifying the target base station 11b through a plane C of the index number of the data PDCP SDU for which the correct reception could not be confirmed by the mobile station, as the next SN. The notification sequence number (next SN) through the plane C shown as interception SN (intercept SN) in the sequence of the transfer of Fig. 19. It may be possible to intercept SN at the same time as the source base station 11a sends the HO request to the target base station 11b.

In the state shown in Fig. 18, the source base station 11a first sends a sequence number n-5 and the first data PDCP SDU through the plane of the U. in addition, due to the military, the source base station 11a notifies the target base station through a plane C only on the sequence number n-5 data PDCP SDU for which could not be confirmed by the proper reception of the mobile station, as a next SN (interception SN). Then, the source base station 11a sends a sequence number n-3 and the following data PDCP SDU through the plane of the U. After, when sending data PDCP SDU, which were taken from the master station 12, the source base station 11a similarly forwards the data PDCP SDU and their ordinal numbers n-1, n of the target base station 11b through the plane of the U. the Target base station 11b receives the sequence number n-5, which was communicated through a plane C, and the sequence number n-5, n-3, n-1 and n, which were reported through the plane of the U, however, because the sequence numbers that have been reported through the plane of the U, is greater than the sequence number reported through the plane C, the target base station 11b adds sequence numbers, which were communicated through the plane of the U, the following data PDCP SDU received by the plane U, and transfers the data to the mobile station. In other words, the target base station 11b ignores the sequence number n-5, which was communicated through a plane C.

Fig. 20 is an example of a case in which there are no data PDCP PDU to send.

The source base station 11a notifies the target base station is Yu 11b through a plane C of the next sequence number n+1 as the next SN. When the interval expires without the target base station 11b, the receiving PDCP SDU from the source base station 11a, the target base station 11b adds a sequence number in the following data PDCP SDU based on the sequence number n+1, which was reported through the plane C, and transfers the data to the mobile station. In other words, the source base station 11b specifies a sequence number m, which is taken from the master station, is equal to n+1, and transmits these data to the mobile station.

• The advantage of the present invention

With the present invention described above, you can quickly send the packets that were sent from the master station to the target base station, the mobile station as a package with a jump, thus giving the opportunity to eliminate time delays in the data and improve the overall system performance. Moreover, the mobile station removes the packages from the jump from being a control object reordering (control order) and manages the order of only packets other than packets with a jump, then delivers the packets to the higher-level device (top level) in the order of sequence numbers. As a result, the mobile station is able to properly control the order of the packets, which is s are subject to reorder, even when there is only one function of order.

Moreover, with the present invention, the mobile station detects the end of forwarded packets, based on the ID of the last packet, and thus able to stop reordering. Therefore, it is possible to eliminate time delays in the data and improve the performance of the whole system.

1. A mobile station that contains
means for receiving a first PDU (Protocol data unit) PDCP Protocol (packet data convergence) from the source base station;
the means of reception for receiving the second PDCP PDU from the target base station, in which the second PDCP PDU is created using the sequence number and SDU (block data services) PDCP, which are transmitted from the source base station to the target base station;
a storage medium for storing a PDCP SDU corresponding to the first PDCP PDU, and a PDCP SDU corresponding to the second PDCP PDU; and
means for reordering for the implementation of the orderly delivery of the stored PDCP SDU based on the sequence numbers.

2. Mobile station according to claim 1, in which the mentioned sequence number is transmitted via the control plane from the source base station to the target base station.

3. Mobile station according to claim 1, in which the mentioned PDCP SDU and the above-mentioned sequence number is passed through the user plane from the source base is the first station to the target base station.