Data transmission method, rlc entity, total link unit and branch link unit

Abstract

The present invention provides a data transmission method, an RLC entity, a total link unit and a branch link unit. The present invention changes the existing division position of the distributed architecture of the access network, and adopts the mode of division and reconstruction in the AM RLC entity , so that the distributed architecture of the access network can be realized on the basis of being compatible with the functions of the existing RLC protocol stack and without changing the functions of the existing PDCP protocol.

Description

technical field [0001] The present invention relates to the technical field of wireless communication systems, and in particular to a data transmission method of an Acknowledged Mode (AM, Acknowledged Mode)-based Radio Link Control (RLC, Radio Link Control) entity, an AM RLC entity, and a summary of the AM RLC entity. Link unit and branch link unit. Background technique [0002] As a complete entity, the AM RLC protocol entity in the 3GPP TS 36.322 protocol performs functions such as packet subdivision / reassembly, Automatic Repeat-reQuest (ARQ, Automatic Repeat-reQuest) control, and data reassembly during data lossless handover. [0003] figure 1 It is a schematic diagram of the functional structure of the AM RLC entity in the prior art. Its sending function includes processing such as segmentation / concatenation of data and adding RLC headers, and its receiving function includes control packets, ARQ reordering, removing RLC headers and service data units (SDU, Service Data...

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Problems solved by technology

[0007] 1. It is necessary to add a sorting function for data packets in PDCP. This processing method confuses the functional division of RLC and PDCP, and destroys the principle of functional division of the protocol stack that only RLC is responsible for data packet sorting; 2. It is necessary to add in the PDCP protocol A complete set of sequential sending and receiving reordering mechanisms, which greatly changes the PDCP protocol stack; 3. In the current protocol, PDCP does not need to process data in TM mode. If PDCP supports the sorting function of data packets, for the protocol The completeness of the function needs to increase the processing of the TM mode; 4. When PDCP sorts through the sequence number (SN) of the PDCP PDU, it is possible to sort the PDCP PDUs sent by multiple RLCs, which leads to implementation complexity Problems such as large size and extended time when sorting

5. When reestablishment (reestablishment), because the data and control information between RLC and PDCP take a long time for non-ideal transmission, a new delay is added to the reestablishment process

[0008] From the above, it can be seen that when the existing technology realizes the distributed architecture of the access network, many changes will be made to the existing protocol processing flow, resulting in the disadvantages of high implementation complexity and large delay

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