案例文档基站UBPG板隐性故障导致接通率低问题处理案例(共9页)

1、案例(n l)文档_GDtec_201407郴州永兴石塘(sh tn)基站UBPG板隐性故障(gzhng)导致接通率低问题处理案例 _CBJ()1故障(gzhng)现象2月10日，永兴县移动(ydng)分公司(n s)反馈在“郴州永兴石塘ZGB880040PT”基站下用户投诉经常接不到电话，打出电话都很正常。2问题原因分析无线接通率低问题原因如下：排查硬件故障：首先查询问题小区实时或历史告警，观察问题小区是事存在硬件故障，如果有硬件故障，首先排查硬件故障；解决信道拥塞：取一周指标分析，该小区是否有持续或突发性TCH拥塞、SD拥塞，如特定时段有TCH拥塞、SD拥塞，观察同时段接通类指标是否异常，

2、如果指标异常，问题原因可能与TCH、SD信道不足有关，参数调整和扩容可解决该类问题；排查硬件隐性故障：取载频级话统分析问题小区是否存在隐性故障，载频有硬件故障的更换载频；弱覆盖：提升下行功率，调整天馈，新增资源；排查干扰：按照直放站干扰、频率干扰、天馈系统干扰，外部干扰（包括C网干扰）的顺序依次排查小区范围内是否存在干扰，及时排查；3排查(pi ch)过程3.1告警信息查询(chxn)对“郴州永兴石塘(sh tn)ZGB880040PT”站点进行告警查询，未发现告警。且近一周都无告警。3.2投诉信息获取与投诉用户进行联系，用户反映最近经常接不到电话，但能正常拨出电话。且周边用户也存在类似问题。

3、手机接收信号正常，拨出电话通话质量也很正常。因此，我们排除掉弱覆盖，以及用户手机、SIM卡等的问题，怀疑为可能存在参数调整或者是语音业务拥塞、硬件故障、干扰导致该现象。3.3参数调整记录核查通过对“郴州永兴石塘ZGB880040PT”站点所属BSC256的操作日志进行核查，未发现近期有对问题站点进行参数调整的记录。3.3网管指标(zhbio)查询(chxn)及分析(fnx)对问题站点小区指标进行查询，选取近一周数据，发现“郴州永兴石塘ZGB880040PT-2”、“郴州永兴石塘ZGB880040PT-3”小区同时存在TCH指配成功率低问题，且未发现TCH拥塞的问题。对问题小区的的载频级指标进一

4、步查询发现“郴州永兴石塘ZGB880040PT-2”小区逻辑载频1、2、4的TCH指配成功率100%，3载频指配失败率较高（该载频只配置了1条TCH信道）；“郴州永兴石塘ZGB880040PT-3”小区1载频的TCH指配成功率100%，2载频指配失败率较高，其他3、4载频都是数据业务信道。相关指标查询如下：“郴州永兴石塘ZGB880040PT-2”小区：“郴州永兴石塘ZGB880040PT-3”小区：3.4 现场测试(csh)验证根据现场测试LOG发现TCH指配失败导致(dozh)未接通，且主叫未接通也是同样原因导致，只不过被叫几率高，因为主叫接入BCCH载频，而被叫接入TCH载频几率较高，与

5、后台TCH载频指配失败高相符。同时现场(xinchng)测试通话质量良好，无误码，基本排除干扰问题。“郴州永兴石塘ZGB880040PT-2” 小区：“郴州永兴石塘(sh tn)ZGB880040PT-3” 小区(xio q)：3.5 问题(wnt)定位及处理结合投诉信息获取、网管指标查询以及现场测试分析，可以排除弱覆盖，干扰问题，同时把问题定位到了“郴州永兴石塘ZGB880040PT-2”小区的逻辑载频3，“郴州永兴石塘ZGB880040PT-3”小区的逻辑载频2。初步怀疑“郴州永兴石塘ZGB880040PT-2”、“郴州永兴石塘ZGB880040PT-3”小区逻辑载频对应的UBPG板存在隐

6、性故障，或硬件载频存在隐性故障。经后台人员核查发现，“郴州永兴石塘ZGB880040PT”站点有2块UBPG板，且TCH指配成功率低的逻辑载频（2小区的3载频及3小区的2载频）均对应了槽位号为8的UBPG板。而槽位号为6的UBPG板对应的逻辑载频指标均正常。怀疑槽位号为8的UBPG板存在隐性故障。采用“删除法”，将该站点槽位号为8的UBPG板的数据删除，使所有逻辑载频均绑定至槽位号为6的UBPG板。调整后观察指标，小区整体TCH指配成功率及无线接通率恢复至正常，达到98%以上。后台调整记录截图如下：备注：中兴设备UBPG板是基带数据处理板，一块UBPG板支持12块逻辑载频。调整前的载频物理逻辑

7、关系对应(duyng)如下：调整后的载频物理逻辑关系对应(duyng)如下：3.7 处理结果2月14日，删除(shnch)“郴州永兴石塘ZGB880040PT”站点存在隐性故障的8号槽UBPG板的数据后，“郴州永兴石塘ZGB880040PT-2”、“郴州永兴石塘ZGB880040PT-3”小区TCH分配成功率指标恢复正常。后期对投诉用户的回访，用户反馈能正常接到电话。问题解决。调整前后载频级话统指标对比如下：时间小区载频TCH指配尝试次数(次)TCH指配成功次数(次)TCH指配成功率2014-2-10郴州永兴石塘ZGB880040PT-211864186399.95%2014-2-10郴州永兴

8、石塘ZGB880040PT-23315113.49%2014-2-10郴州永兴石塘ZGB880040PT-24303303100.00%2014-2-10郴州永兴石塘ZGB880040PT-2229429299.32%2014-2-11郴州永兴石塘ZGB880040PT-2117051705100.00%2014-2-11郴州永兴石塘ZGB880040PT-2330772.28%2014-2-11郴州永兴石塘ZGB880040PT-24247247100.00%2014-2-11郴州永兴石塘ZGB880040PT-22234234100.00%2014-2-12郴州永兴石塘ZGB880040P

9、T-211890188899.89%2014-2-12郴州永兴石塘ZGB880040PT-23255218.24%2014-2-12郴州永兴石塘ZGB880040PT-2428228199.65%2014-2-12郴州永兴石塘ZGB880040PT-2230130099.67%2014-2-13郴州永兴石塘ZGB880040PT-211832183199.95%2014-2-13郴州永兴石塘ZGB880040PT-23248156.05%2014-2-13郴州永兴石塘ZGB880040PT-24262262100.00%2014-2-13郴州永兴石塘ZGB880040PT-2223823799

10、.58%2014-2-14郴州永兴石塘ZGB880040PT-2328723080.14%2014-2-14郴州永兴石塘ZGB880040PT-211782177999.83%2014-2-14郴州永兴石塘ZGB880040PT-22234234100.00%2014-2-14郴州永兴石塘ZGB880040PT-24309309100.00%2014-2-15郴州永兴石塘ZGB880040PT-2323022798.70%2014-2-15郴州永兴石塘ZGB880040PT-24259259100.00%2014-2-15郴州永兴石塘ZGB880040PT-211704170199.82%20

11、14-2-15郴州永兴石塘ZGB880040PT-22227227100.00%2014-2-16郴州永兴石塘ZGB880040PT-211789178899.94%2014-2-16郴州永兴石塘ZGB880040PT-2430630399.02%2014-2-16郴州永兴石塘ZGB880040PT-2224224099.17%2014-2-16郴州永兴石塘ZGB880040PT-2332031899.38%2014-2-17郴州永兴石塘ZGB880040PT-22226226100.00%2014-2-17郴州永兴石塘ZGB880040PT-211729172699.83%2014-2-17

12、郴州永兴石塘ZGB880040PT-2325325098.81%2014-2-17郴州永兴石塘ZGB880040PT-24233233100.00%2014-2-10郴州永兴石塘ZGB880040PT-3300/2014-2-10郴州永兴石塘ZGB880040PT-3400/2014-2-10郴州永兴石塘ZGB880040PT-321119.09%2014-2-10郴州永兴石塘ZGB880040PT-3110371037100.00%2014-2-11郴州永兴石塘ZGB880040PT-3212216.67%2014-2-11郴州永兴石塘ZGB880040PT-3111441144100.00

13、%2014-2-11郴州永兴石塘ZGB880040PT-3300/2014-2-11郴州永兴石塘ZGB880040PT-3400/2014-2-12郴州永兴石塘ZGB880040PT-3300/2014-2-12郴州永兴石塘ZGB880040PT-321119.09%2014-2-12郴州永兴石塘ZGB880040PT-3111241124100.00%2014-2-12郴州永兴石塘ZGB880040PT-3400/2014-2-13郴州永兴石塘ZGB880040PT-3300/2014-2-13郴州永兴石塘ZGB880040PT-3400/2014-2-13郴州永兴石塘ZGB880040PT

14、-311045104499.90%2014-2-13郴州永兴石塘ZGB880040PT-32500.00%2014-2-14郴州永兴石塘ZGB880040PT-3300/2014-2-14郴州永兴石塘ZGB880040PT-325360.00%2014-2-14郴州永兴石塘ZGB880040PT-3110971097100.00%2014-2-14郴州永兴石塘ZGB880040PT-3400/2014-2-15郴州永兴石塘ZGB880040PT-3277100.00%2014-2-15郴州永兴石塘ZGB880040PT-3400/2014-2-15郴州永兴石塘ZGB880040PT-31990

15、98999.90%2014-2-15郴州永兴石塘ZGB880040PT-3300/2014-2-16郴州永兴石塘ZGB880040PT-3288100.00%2014-2-16郴州永兴石塘ZGB880040PT-3300/2014-2-16郴州永兴石塘ZGB880040PT-3192492399.89%2014-2-16郴州永兴石塘ZGB880040PT-3400/2014-2-17郴州永兴石塘ZGB880040PT-3400/2014-2-17郴州永兴石塘ZGB880040PT-3300/2014-2-17郴州永兴石塘ZGB880040PT-3110221022100.00%2014-2-17郴州永兴石塘ZGB880040PT-3277100.00%4.总结(zngji)分析(fnx)此类故障需从面到点再从点到面，结合(jih