通信人家园

 找回密码
 注册

只需一步,快速开始

短信验证,便捷登录

搜索

军衔等级:

  上等兵

注册:2010-5-13
跳转到指定楼层
1#
发表于 2012-2-21 07:41:09 |只看该作者 |倒序浏览
1. Contention Based Random Access
    过程 1: RRC establishment or RRC reestablishment
                CCCH logical channel (RRC establishment or RRC reestablishment)
    过程 2: RRC handover on DCCH1 without the rach-ConfigDedicated configed
                 NONE- CCCH logical channel
    过程 3: PDCCH order
                 NONE- CCCH logical channel

2.
None-Contention Based Random Access
    过程 4: RRC handover on DCCH1 with the rach-ConfigDedicated configed
                NONE- CCCH logical channel (PDCCH order or RRC handover on DCCH1)

《过程描述》
过程 1: If CCCH logical channel (the CCCH SDU is included in Msg3)
                    - MAC initializes random access
                    - ENB sends random access response (with temporary-CRNTI and UL-Grant) to UE
                    - MAC sends the Msg3 with CCCH-SDU (with RRC connection establishment or reestablishment request   message UEID: 5bytes ;Establishment cause: 1 byte) to ENB on the received temporary-CRNTI
                    - MAC starts contention resolution timer
                    - ENB sends RRC connection establishment or reestablishment response message with MAC control element (UE Contention Resolution Identity) to UE on DL-SCH on the temporary-CRNTI
                    - MAC matches the UE Contention Resolution Identitywith the CCCH-SDU (checking the UEID)
                    - If matches
                           a. Stop contention resolution timer
                           b. Set the temporary-CRNTI to the C-RNTI
                           c. Send the RRC connection establishment or reestablishment response message to RRC
                           d. Random Access procedure successfully completed
                    - Else
                           a. Random Access procedure failed

过程 2, 3, 4: If NONE- CCCH logical channel (the C-RNTI MAC control element is included in Msg3)
                                - MAC initializes random access
                                - ENB sends random access response (with temporary-CRNTI and UL-Grant) to UE
                                - if ra-PreambleIndex was explicitlysignalled and it was not 0 (handover with the rach-ConfigDedicated message configed) <过程 2>
                                        a. MAC does not start contention resolution timer
                                        b. MAC sends the ULdata (e.g. RRC Connection Reconfiguration Complete- handover complete message on DCCH1)by the assigned UL-Grant on the C-RNTI (not temporary-CRNTI)
                                        c. The Random Access procedure successfully completed
                              NOTE: I think no Msg3 transmission in this procedure<过程 2>.
                                - Else (PDCCHorder or handover without the rach-ConfigDedicated message configed) < 过程 3, 4>
                                        a. MAC sends the Msg3 with C-RNTI MAC control element (original C-RNTI for PDCCH or the assigned C-RNTI for handover) to ENB on the received temporary-CRNTI
                                         b. MAC starts contention resolution timer
                                         c. If ENB sends PDCCH notification on C-RNTI (the C-RNTI sent in the MAC control element ,   not temporary-CRNTI)
                                      · stop mac-ContentionResolution Timer
                                      · discard the Temporary C-RNTI (use the original C-RNTI or the assigned C-RNTI for handover)
                                      · use the UL grant included in this notification for a new transmission
                                      · Random Access procedure successfully completed
                                  Else 《对应 c if》
                                      If mac-ContentionResolution Timer expires
                                         Random Access procedure failed

[ 本帖最后由 Charlesl0420 于 2012-2-21 09:14 编辑 ]

举报本楼

本帖有 9 个回帖,您需要登录后才能浏览 登录 | 注册
您需要登录后才可以回帖 登录 | 注册 |

版规|手机版|C114 ( 沪ICP备12002291号-1 )|联系我们 |网站地图  

GMT+8, 2025-7-23 03:11 , Processed in 0.444185 second(s), 17 queries , Gzip On.

Copyright © 1999-2025 C114 All Rights Reserved

Discuz Licensed

回顶部