【资料名称】：阿尔卡特counter&procedure

【资料作者】：xx

【资料日期】：333

【资料语言】：中文

【资料格式】：PPT

【资料目录和简介】：

Channel Request : available causes : Emergency call, Call re-establishment, Answer to paging, OC and LU. Contains a Random Number to distinguish the answer of the BTS. Send on the RACH. The mobile can send several Ch Req. At the end of the sequence, T3126 is started. The MS starts with Timing Advance of 0.
Channel Required : Common Channel Management. Transmission of the Random Number and the measured timing advance.
Channel Activation : the BTS allocates the channel, command the LAPDm layer 2 entity to perform the contention resolution establishment procedure (designed to ensure that only one MS may connect to the signaling channel during the Im. Ass. Proc.)
Immediate Assign CMD : send on the AGCH to the mobile in IDLE mode to change the channel configuration to a dedicated configuration while staying in the same cell. The MS compares the Random access number.
SABM (Set Asynchronous Balanced Mode: to) :create a LAPDm connection. Upon the seizure of the assigned dedicated channel, the mobile station establishes the main signalling link on this channel by sending aL2 SABM frame containing the L3 service request message (CM Serv Req, LU Req, IMSI Detach, Pagres). Send on SDCCH
UA (Unnumbered Acknoledge). The service request send by the MS is retruned by the network. The MS compares the message send in the SABM and received in the UA, and leaves the channel in case they do not match.(Send on SDCCH). This allow the discrimination of 2 mobiles
Establish Ind : idem as SABM. C01 is incremented with Paging Response. C02 with LU,OC.
SCCPConnection Required : the LAC and CI of the BTS are given
C40 : number of seconds a SDCCH channel is used