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Packet data convergence protocol serial number synchronization method and device

A technology for converging protocols and packetized data, applied in the directions of synchronization devices, wireless communications, electrical components, etc., can solve the problems of reduced data transmission rate, failure to play the PDCP transmission sliding window function, etc., to achieve fast synchronization and improve data transmission rate. Effect

Active Publication Date: 2014-03-12
ZTE CORP
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Problems solved by technology

[0004] It can be seen from the above description that during the sequence number synchronization process, PDCP data transmission is in a stop waiting state (no new data will be sent until the sequence number PDU is successfully transmitted). At this time, the PDCP transmission sliding window function is not played, and the data transmission rate is reduced. reduce

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  • Packet data convergence protocol serial number synchronization method and device

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Embodiment 1

[0074] The technical solution of this embodiment can realize the synchronization of the uplink sequence number during the lossless SRNS relocation process, and specifically includes the following steps:

[0075] Step a1: During the lossless SRNS relocation process, the UE receives the UL_Receive_SN sent by the UTRAN entity, and enters step a2;

[0076] Step a2: The UE compares the received UL_Receive_SN with its own UL_Send_SN and the PDU sequence number in the sending buffer window. If the UL_Receive_SN received by the UE is equal to its own UL_Send_SN or equal to the sequence number of a PDU in its own sending buffer window, then the sequence number If the serial number is available, it is not necessary to synchronize the uplink serial number; otherwise, it is necessary to synchronize the uplink serial number and go to step a3;

[0077] Step a3: The UE assigns the value of UL_Receive_SN to UL_Send_SN, changes the sequence number of the first unacknowledged PDU in the sending...

Embodiment 2

[0081] The technical solution of this embodiment can realize the synchronization of downlink sequence numbers during the lossless SRNS relocation process, and specifically includes the following steps:

[0082] Step b1: During the lossless SRNS relocation process, the UTRAN entity receives the DL_Receive_SN sent by the UE, and enters step b2;

[0083]Step b2: The UTRAN entity compares the received DL_Receive_SN with its own DL_Send_SN and the PDU sequence number in the sending buffer window. If the DL_Receive_SN received by the UTRAN entity is equal to its own DL_Send_SN or equal to the sequence number of a certain PDU in its sending buffer window Then the serial number is available, and there is no need to synchronize the downlink serial number, otherwise, the downlink serial number needs to be synchronized, and go to step b3;

[0084] Step b3: The UTRAN entity assigns the value of DL_Receive_SN to DL_Send_SN, changes the serial number of the first unacknowledged PDU in the s...

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Abstract

The invention provides a packet data convergence protocol serial number synchronization method and a device, and belongs to the field of mobile communication. The packet data convergence protocol PDCP serial number synchronization method is applied to a relocation process of a no-loss serving radio network subsystem SRNS. The PDCP serial number synchronization method comprises that: a first device receives an under-reception protocol data unit PDU serial number sent by a second device of an opposite terminal; and the first device modifies the self-stored under-reception PDU serial number according to the received PDU serial number so that PDCP serial number synchronization is performed. According to the technical scheme, rapid serial number synchronization can be realized in the relocation process of the no-loss SRNS so that data sending efficiency is enhanced.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and device for synchronizing serial numbers of a packet data convergence protocol. Background technique [0002] Lossless SRNS relocation technology is mainly used in SRNS (Serving Radio Network Subsystem, serving radio network subsystem) switching to ensure lossless data transmission. During the lossless relocation process, the UE (User Equipment, user equipment) sends the sequence number expected to receive the downlink PDCP (Packet Data Convergence Protocol, packet data convergence protocol) to the UTRAN entity (UMTS Terrestrial Radio Access Network, UMTS terrestrial radio access network), the UTRAN entity also sends the expected uplink PDCP sequence number to the UE. The UE compares the received sequence number N of expected uplink PDCP with the sequence number of the PDU (Protocol Data Unit, protocol data unit) stored in the sending buffer window. If N is greate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
Inventor 顾宝成
Owner ZTE CORP
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