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Vì lý do này, một tập hợp các mã channelization chấp nhận trên PRACH / P được quy định cụ thể, từ đó UE ngẫu nhiên lựa chọn một mã. Việc lựa chọn ngẫu nhiên được sử dụng để giảm thiểu khả năng xảy ra va chạm. | UE Node B Serving Figure 5.16 RAB Modification - Network Element Viewpoint RAB RB Management Procedures 112 TDD Procedures 6. Node B notifies SRNC that modification preparation is ready Radio Link Reconfiguration Ready . 7. NBAP message Radio Link Reconfiguration Commit is sent from SRNC to Node B with the activation time if a synchronized procedure . 8. RRC message Radio Bearer Reconfiguration is sent by SRNC to UE using RLC in AM or UM mode. The Radio Bearer Reconfiguration Message includes parameters related to Transport Channels Physical Channels etc. They include RRC Transaction Identifier RRC State Indicator RLC Size MAC Logical Channel Priority Reconfigured UL DL Transport Channel Information Type Channel Identity TFS and Physical Channel Information. The activation time is also sent if of a synchronized procedure. 9. Both UE and Nodes B actualize modification of DCH i.e. apply a new transport format . 10. UE sends RRC message Radio Bearer Reconfiguration Complete to SRNC. 11. SRNC acknowledges the modification of radio access bearer Radio Access Bearer Assignment Response to CN. In Figure 5.17 we illustrate the Radio Bearer Reconfiguration as implemented by the various Radio Interface Protocol entities in the UTRAN and the UE 3 . After the receipt of a RADIO BEARER RECONFIGURATION from the RNC-RRC acknowledged or unacknowledged transmission optional for the network the UE executes the modifications on L1 and L2. Upon receipt of a RADIO BEARER RECONFIGURATION COMPLETE message from the UE-RRC the NW-RRC executes the modifications on L1 and L2. Finally the old configuration if any is released from Node B-L1. As a variation the configuration of network side L1 MAC etc. may be performed prior to receiving the COMPLETE message so that the UTRAN is ready to receive any data that UE may send immediately following the sending of the COMPLETE message. Note that Radio Bearer Reconfiguration involves in general reconfiguration of Transport Channel and Physical Channel
