描述
RNC在以下2種情況下將涉及到用戶平面的操作:一種是對小區(qū)的公共傳輸信道做操作的時候;另一種是為UE提供專用信道的時候。在對傳輸信道做操作的過程中,用戶平面只有FP同步消息,不會有RRC消息。當(dāng)RNC涉及到對UE操作時候,需要先在RNC和UE之間建立一個無線連接(RRC連接),建立過程大致如下:UE先向RNC請求建立RRC連接,RNC收到請求后根據(jù)具體情況選擇是否為該UE建立專用信道。如果要建立專用信道(dedicatedchannel,DCH),RNC將通過NBAP協(xié)議請求建立無線鏈路或者重配置無線鏈路,NodeB成功應(yīng)答后,RNC將通過ALCAP協(xié)議分配DCH所需的AAL2鏈路,成功分配后RNC通過前向接入信道(forwardaccesschannel,F(xiàn)ACH)發(fā)送RRC建立成功消息。如果不需要為該UE建立專用信道,那么就沒有上述NBAP和ALCAP過程,RNC將直接通過FACH發(fā)送RRC建立成功消息,該消息將指示UE只能通過公共傳輸信道傳輸所有的消息給RNC。圖2顯示了Iub接口中可能會出現(xiàn)的消息種類。
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