阿尔卡特分配失败处理讲述.doc

阿尔卡特分配失败处理分析 对于无线原因引起的TCH分配失败次数多的小区，其掉话率也偏高。本文主要介绍无线原因引起的TCH分配失败。在Alcatel无线系统中，关于该类型TCH分配失败的计数器是MC746B。下图是从信令角度解释触发分配失败计数的条件。 MC746B 从以上信令的流程结和阿尔卡特计数器对分配阶段的各各技术器做分析研究.在B8版中新加相关分配阶段计数器: NB_TCH_NOR_ASS_REQ MC140a Number of normal assignment requests for TCH establishment (in HR or FR usage). NB_TCH_NOR_ASS_ATPT MC140b Number of normal assignment commands for TCH establishment (in HR or FR usage). MC140a： 对TCH的试呼次数（不含切换）。 – 统计从A接口上接收到的“Assignment Request” 消息的次数 MC140b： 对TCH的分配尝试次数（不含切换）。 – 统计从ABIS接口上发送的“Assignment commands” 消息的次数 注意这两个计数器定义在110计数器中,MC746B是统计分配失败的. NB_TCH_NOR_ASS_EXEC_FAIL_RADIO_TRX (MC746B) Trigger condition: 1) The timer T3107 in the BSS supervising the TCH channel seizure by the mobile expires. 2) The BSC receives a 04.08 ASSIGNMENT FAILURE on the old (SDCCH) channel during the normal assignmentprocedure. Counter definition: Number of TCH (in HR or FR usage) normal assignment -execution failures due to MS access problem, per TRX. MC746b： 对TCH的分配失败次数（不含切换）。 – 统计BSC从ABIS接口上收到的“Assignment FAILURE” 消息的次数. 以上三个信令点的载体是SDCCH,所以是定义不到载频上的。 还两个对TRX载频定义的计数器，MC703和MC718和分配相关。 NB_TCH_NOR_ASS_ALLOC_TRX MC703 Type 110 : Overview measurements Measured unit: none Trigger condition: Whenever a 08.58 CHANNEL ACTIVATION message is about to be sent on Abis Interface to activate a TCH channel for normal assignment. Counter definition: Number of TCH (in HR or FR usage) normal assignment -whose RTCH channel is allocated in the BSC, per TRX. MC703： 对TCH的载频信道激活次数（不含切换）。 统计BSC从ABIS接口上发送的“CHANNEL ACTIVATION” 消息的次数. NB_TCH_NOR_ASS_SUCC_TRX MC718 Type 1 : Traffic measurements Trigger condition: Whenever a 04.08 ASSIGNMENT COMPLETE message is received on Abis interface for a TCH channel that is not involved in a handover procedure. Counter definition: Number of TCH (in HR or FR usage) normal assignment successes, per TRX . MC718： 对TCH的分配成功次数（不含切换）。 统计BSC从ABIS接口上发送的“ASSIGNMENT COMPLETE” 消息的次数. 从上述计数器和信令流程有助于分析定位分配失败在那个载频上，从分配失败的原