默认参数设置导致TBF上行掉话率高.doc

文档名称文档密级：   TIME \@ yyyy-M-d 2017-4-23华为机密，未经许可不得扩散第PAGE8页, 共 NUMPAGES \* Arabic \* MERGEFORMAT 8页 N国N局点TBF掉话分析 问题发现 N国N局点5频3制式网络搬迁和新建。2G BTS和BSC之间部分TDM，部分IP组网。2G Pilot搬迁完成后出现了TBF上行掉话率差于原网。 分析阶段 统计一周TBF上行掉话情况，将超过Reference KPI（2%）的站点筛选如下。 GCELLTBF Drop RateGCELLTBF Drop RateAKH118_G9-116AKH165_G9-12.660342741AKH165_G9-015AKH151_G9-22.656725062AKH035_G9-211AKH102_G9-22AKH086_G9-37.004210628AKH404_G9-12.596914696AKH438_G9-26.879498546AKH035_G9-32.566641427AKH233_G9-25.833333333AKH035_G9-12.389160587AKH086_G9-25.648468878AKH176_G9-12.369768924AKH165_G9-35.493796742AKH450_G9-32AKH323_G18-85.292479109AKH448_G9-22.321347292AKH450_G9-15AKH389_G9-22.306583919AKH438_G9-15.075961258AKH395_G9-22.282579183AKH120_G9-14.122765941AKH213_G9-12.243677357AKH264_G9-14.112591567AKH171_G9-12AKH151_G9-13.763577733AKH038_G9-22.230914017AKH213_G9-33.727231391AKH292_G9-22AKH006_G9-13.480239601AKH171_G9-22.214668036AKH006_G9-23.288853413AKH213_G9-22.212920837AKH409_G9-23.157796102AKH006_G9-32.200548665AKH110_G9-13AKH383_G9-22.176500595AKH086_G9-12.973030583AKH165_G9-22.171162508AKH038_G9-32.913654154AKH450_G9-22.168871686AKH151_G9-32AKH193_G9-12.132811228AKH448_G9-12.761627907AKH438_G9-32.066032733AKH038_G9-12　　 分析其中一个站点相关的TBF上行掉话原因分布： 可以看出大部分的掉话原因都是N3101超时导致的掉???。 N3101统计的是接入阶段的定时器超时导致的掉话，N3101触发的条件入下协议的解释： N3101: When the network after setting USF for a given TBF, receives a valid data block of this TBF from the mobile station in a block assigned for this USF, it will reset counter N3101. If PS Handover is not ongoing, the network will increment counter N3101 for each USF for which no data is received for this TBF. N3101max shall be greater than 8. If N3101 = N3101max, the network shall stop the scheduling of RLC/MAC blocks from the mobile station for