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Packet data convergence protocol reconstruction method and device

A technology for converging protocols and grouping data, applied in wireless network protocols, digital transmission systems, error prevention/detection through repeated transmission, etc., can solve problems such as wasting air interface resources, reduce repeated transmission, improve recovery speed, and avoid transmission Effect

Inactive Publication Date: 2014-03-19
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] The technical problem to be solved by the present invention is to propose a method and device for rebuilding the packet data convergence protocol layer, so as to avoid sending invalid feedback messages to waste air interface resources and cause the compressor to enter abnormal processes such as mode switching when the decompressor is unknown.

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  • Packet data convergence protocol reconstruction method and device
  • Packet data convergence protocol reconstruction method and device
  • Packet data convergence protocol reconstruction method and device

Examples

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Effect test

application example 1

[0154] For UM-type PDCP entities, a classified buffering method is adopted, that is, the service message buffer stores service messages, and the control message buffer stores control messages.

[0155] For the receiving side, the following steps are included:

[0156] 1.1 When the UM type PDCP layer is rebuilt, the receiving side control message buffer is released, and all feedback type control messages are cleared;

[0157] 1.2 When reconstruction occurs, process the message in the service message buffer on the receiving side to generate PDCP SDU;

[0158] 1.3 Filter all the feedback information generated in step 1.2 to avoid encapsulation processing of this type of information by the sending side;

[0159] 1.4 Submit the PDCP SDU to the upper layer;

[0160] 1.5 Repeat steps 1.2-1.4 until all messages in the service message buffer on the receiving side are processed;

[0161] 1.6 Update the security configuration of the decryption module (such as changing the key), reset ...

application example 2

[0169] For AM-type PDCP entities, a classified buffering method is adopted, that is, the service message buffer stores service messages, and the control message buffer stores control messages.

[0170] For the receiving side, the following steps are included:

[0171] 2.1 When the AM type PDCP layer is rebuilt, the receiving side control message buffer is released, and all feedback type control messages and status report type control messages are cleared;

[0172] 2.2 When reconstruction occurs, process the messages in the service message buffer on the receiving side to generate PDCP SDUs;

[0173] 2.3 Filter all the feedback information generated in step 2.2 to avoid encapsulation processing of this type of information by the sending side;

[0174] 2.4 SDUs with continuous PDCP SNs will be sent to the upper layer, and message holes will appear, that is, SDUs with discontinuous SNs will be cached;

[0175] 2.5 Repeat steps 2.2-2.4 until all messages in the service message bu...

application example 3

[0184] For reconstruction of the PDCP layer in UM mode, the method of hybrid buffering + message filtering is adopted, that is, control messages and service messages are stored in a mixed buffer.

[0185] For the receiving side, the following steps are included:

[0186] 3.1 When the PDCP layer reconstruction in UM mode occurs, the type 1 feedback message filter takes effect, and filters the resident messages in the mixing buffer on the receiving side, and the resident type 1 feedback messages will be eliminated;

[0187] 3.2 Unpack->decrypt->decompress the service packets passing the filter to generate PDCP SDU;

[0188] 3.3 The type 2 feedback message filter takes effect when reconstruction occurs, and filters the type 2 feedback information generated in step 3.2 to avoid encapsulation of this type of information by the sending side;

[0189] 3.4 Submit the PDCP SDU to the upper layer;

[0190] 3.5 Repeat steps 3.1-3.4 until all messages on the receiving side are processed...

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Abstract

The present invention discloses a method and device for reestablishment at packet data convergence protocol (PDCP) layer. On the receiving side of the PDCP layer, the method comprises: clearing resident control messages (501); processing resident service messages, and clearing feedback information generated during processing (502); and resetting a decompressor, and updating configuration of a decryption module (503). On the transmitting side of the PDCP layer, the method comprises: resetting a compressor, and updating configuration of an encryption module; clearing the resident control messages; and reprocessing the resident service messages. With the differentiated processing for the resident messages at the PDCP layer during the reestablishment, the present invention can avoid the abnormal mode switching of the compressor, and accelerate the user plane restoration after the reestablishment. The present invention can further avoid the transmission of invalid feedback, thus improving the utilization of air interface resources; meanwhile, by avoiding the influence of the invalid status report on uplink and downlink transmission policies, the present invention can reduce retransmission of the service messages, thus improving the utilization of air interface resources.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a method and device for re-establishment of PDCP (Packet Data Convergence Protocol) layer in LTE (Long Term Evolution, Long Term Evolution) system. Background technique [0002] The PDCP layer is located above the RLC (Radio Link Control, radio link control) protocol layer in the radio interface protocol stack of LTE, and its physical functions are as follows figure 1 shown. The RLC entity corresponding to the PDCP may be in an unacknowledged mode (UM, Unacknowledged Mode) or an acknowledged mode (AM, Acknowledged Mode). For ease of description, herein, the PDCP layer / entity corresponding to the RLC layer AM / UM is referred to as an AM / UM type PDCP layer / entity. The PDCP re-establishment procedure (Re-establishment procedure) refers to a PDCP entity reset procedure instructed by a high layer. There are many reasons for triggering PDCP re-establishment, such as handov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/06H04W28/14H04W80/00H04L1/08
CPCH04L1/1874H04W76/04H04L1/1835H04W28/04H04W76/20
Inventor 王波侯小安汤德龙李邈
Owner ZTE CORP
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