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Judging method, device and system of random access contention resolution

一种竞争解决、一致的技术，应用在随机接入竞争解决的判断领域，达到避免上行发送错误、加快随机接入成功、缩短随机接入的时间的效果

Active Publication Date: 2014-03-12
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a judging method, device and system for solving random access contention, which can solve the delay problem that may cause UE's random access success in the contention-based random access process

Method used

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  • Judging method, device and system of random access contention resolution
  • Judging method, device and system of random access contention resolution
  • Judging method, device and system of random access contention resolution

Examples

Experimental program
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Embodiment 1

[0034] Such as figure 2 As shown, this embodiment may include the following steps:

[0035]S201. The UE initiates contention-based random access, and randomly selects a RAP and sends it to the eNB. Specifically, the UE may initiate contention-based random access through a MAC or PDCCH order or the like.

[0036] S202. The eNB sends a RAR message to the UE. The RAR message may carry a UL Grant and a TC-RNTI temporarily allocated by the eNB for the UE.

[0037] S203. The UE sends a contention resolution request message Msg3 to the eNB on the resource corresponding to the UL Grant, and the Msg3 carries the C-RNTI allocated by the UE as the MAC control element of the Msg3.

[0038] S204. The UE may start the CRT while sending the Msg3, and wait for the UL Grant for new data transmission masked with the C-RNTI or the DL Assignment masked with the C-RNTI for contention resolution.

[0039] For the scenario where the MAC initiates random access, the UE waits for the UL Grant of n...

Embodiment 2

[0047] Such as image 3 As shown, this embodiment may include the following steps:

[0048] S301 to S304 are the same as S201 to S204 in the first embodiment.

[0049] S305. Before the CRT expires, the eNB sends to the UE a UL Grant masked with the T C-RNTI temporarily allocated by the eNB for the UE.

[0050] S306. The UE judges whether the HARQ (Hybrid Automatic Repeat Request, Hybrid Automatic Repeat Request) process used in the UL Grant is consistent with the HARQ process used when sending the Msg3. If they are inconsistent, it considers that the contention resolution has failed, stops the CRT, and performs backoff according to relevant parameters.

[0051] In this step, the HARQ process used in the UL Grant is inconsistent with the HARQ process used when sending Msg3, so the UE obtains the result that the contention resolution fails.

[0052] S307. After backing off for a period of time, the UE sends the RAP again, and repeats the above steps S301-S306 until the random...

Embodiment 3

[0059] This embodiment is a relatively complete solution obtained by combining various judgment methods described in Embodiment 1 and Embodiment 2. In this embodiment, contention-based random access is still initiated by UE MAC or initiated by PDCCH command. Such as Figure 4 As shown, it is a flow chart of this embodiment, in which the whole process is mainly described from the UE side. This embodiment may include the following steps:

[0060] S401. The UE sends a RAP to the eNB.

[0061] S402. The UE receives the RAR sent by the eNB, and the RAR carries the T C-RNTI temporarily allocated by the eNB for the UE.

[0062] S403. The UE sends a contention resolution request message Msg3 to the eNB, and the Msg3 carries the C-RNTI allocated by the UE.

[0063] S404. After sending the Msg3, the UE simultaneously starts the CRT for timing, monitors the PDCCH, and performs contention resolution.

[0064] S405a. Before the CRT times out, the UE receives the DL Assignment masked by...

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Abstract

Embodiments of the present invention disclose a method, device, and system for judging a random contention resolution. The method includes: sending a contention resolution request message to a network side, where the contention resolution request message carries a cell radio network temporary identifier (C-RNTI) or a common control channel serving data unit (CCCH SDU); and when receiving a network side message masked with a temporary C-RNTI (T C-RNTI) allocated by the network side to the UE before a CRT expires, performing backoff if judging, according to the C-RNTI or CCCH SDU and the signaling type of the network side message, that contention resolution fails.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a judging method, device and system for random access contention resolution. Background technique [0002] In an LTE (Long Term Evolution, long term evolution) system, a UE (User Equipment, user equipment) obtains uplink synchronization and uplink resources through a random access procedure (Random Access Procedure). In the contention-based random access process, the UE randomly selects a RAP from a group of RAPs (Random Access Preamble, random access allocation code) and initiates random access; after receiving the RAR (Random Access Response, random access response ), Msg3 (the third message of random access) will be sent, and according to the reason for initiating random access, CCCH SDU (Common Control Channel Serving Data Unit, common control channel service data unit) or UE will be carried in Msg3 C-RNTI (Cell Radio Network Temporary Identifier, wireless netwo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/00
CPCH04W74/085H04W8/26H04W28/04H04W74/004H04W74/0833
Inventor 权威姜怡张戬
Owner HUAWEI TECH CO LTD
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