TD干扰导致高掉线案例.doc

干扰导致高掉线
故障现象：
RNC26下的向西工业区32752A小区PS无线掉线率一直比较差，掉线次数在117-171次之间，掉线率在6%左右，最近几天指标如下表所示：
时间CELLIDCELLNAMEPS域RAB成功次数请求释放的分组域RAB总数目(小区)PS无线掉线率10/05/201252052新城综合楼52052A25431616.33%10/06/201252052新城综合楼52052A20901175.60%10/07/201252052新城综合楼52052A27201716.29%10/08/201252052新城综合楼52052A30491595.21%二、原因分析：
通过OMC查询，小区状态正常，无告警，各单板允许正常；
通过OMC统计小时级指标，发现该小区掉线分布在很多时间段，并非集中在个别时间段中；
通过Nastar小区性能分析，未发现TOP用户或TOP终端造成的高掉线,经Nastar进行覆盖分析，小区覆盖情况良好，并无明显弱覆盖现象；

统计该小区10月8日的干扰指标，发现该小区的辅频2存在-75的干扰，而且其他频点与上行都无干扰，具体情况如下：
起始时间载频索引小区标识CARR.TddMeanIscp.Ts1(毫瓦分贝)CARR.TddMeanIscp.Ts2(毫瓦分贝)CARR.TddMeanUppchIscp.POS0(毫瓦分贝)10/08/201200:00:00PRIMARY52052-109.022-108.742-108.83610/08/201200:00:00SECONDARY_152052-104.002-105.343-10/08/201200:00:00SECONDARY_252052-74.511-74.5397-10/08/201201:00:00PRIMARY52052-109.473-109.275-109.70210/08/201201:00:00SECONDARY_152052-106.828-106.279-10/08/201201:00:00SECONDARY_252052-74.534-74.5347-、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、10/08/201210:00:00SECONDARY_252052-74.4152-74.459-10/08/201211:00:00PRIMARY52052-109.256-108.327-106.00210/08/201211:00:00SECONDARY_152052-104.564-104.059-10/08/201211:00:00SECONDARY_252052-74.394-74.4402-10/08/201212:00:00PRIMARY52052-107.587-104.805-106.22310/08/201212:00:00SECONDARY_152052-103.73-103.229-10/08/201212:00:00SECONDARY_252052-74.2195-74.2912-、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、10/08/201220:00:00PRIMARY52052-107.175-104.254-105.7610/08/201220:00:00SECONDARY_152052-95.4352-100.518-10/08/201220:00:00SECONDARY_252052-74.4627-74.5112-10/08/201221:00:00PRIMARY52052-108.297-105.179-105.75510/08/201221:00:00SECONDARY_152052-103.392-100.683-10/08/201221:00:00SECONDARY_252052-74.4445-74.494-10/08/201222:00:00PRIMARY52052-108.419-106.873-103.82210/08/201222:00:00SECONDARY_152052-100.738-103.435-10/08/201222:00:00SECONDARY_252052-74.3622-74.4212-10/08/201223:00:00PRIMARY52052-109.053-103.523-108.51610/08/201223:00:00SECONDARY_152052-102.758-101.426-10/08/201223:00:00SECONDARY_252052-74.475-74.5212-通过MapInfo进行邻区相关信息查询，发现该小区的辅频2（9420）与邻区榴花东街47011A的辅频2（9420）存在