EVDO信令指导书.ppt

CDMA接入部分 Mobile Access And Traffic Acquisition 系统检测子状态主要处理流程 The mobile station shall perform the custom system selection process as follows: ? The mobile station shall determine which system to use. ? If the mobile station is to use a CDMA system, it shall set CDMABANDs to the band class (see Table 7.7.2.3.2.8-3) for the selected system. ? If the mobile station is to use a CDMA system with CDMABANDs = 00000, it shall perform the following: - If the mobile station is to use System A, it shall set SERVSYSs to SYS_A. If the mobile station is to use System B, it shall set SERVSYSs to SYS_B. - The mobile station shall set CDMACHs either to the Primary or Secondary CDMA Channel number (see 7.1.1.1) for the selected serving system (SERVSYSs). If the mobile station fails to acquire a CDMA system on the first CDMA Channel it tries, the mobile station should attempt to acquire on the alternate CDMA Channel (Primary or Secondary) before attempting other alternatives. ? If the mobile station is to use a CDMA system with CDMABANDs = 00001, it shall perform system selection and CDMA processing as described in ANSI J-STD-008). 导频捕获子状态主要工作机制 In this substate, the mobile station acquires the Pilot Channel of the selected CDMA system. Upon entering the Pilot Channel Acquisition Substate, the mobile station shall tune to the CDMA Channel number equal to CDMACHs, shall set its code channel for the Pilot Channel (see 7.1.3.1.8), and shall search 31 for the Pilot Channel. If the mobile station acquires the Pilot Channel within T 20m seconds (see Appendix D), the mobile station shall enter the Sync Channel Acquisition Substate. If the mobile station does not acquire the Pilot Channel within T 20m seconds, the mobile station shall enter the System Determination Substate with an acquisition failure indication (see 6.6.1.1). 同步信道捕获子状态主要机制 In this substate, the mobile station receives and processes the Sync Channel Message to obtain system configuration and timing information. If