湘潭电信掉线率参数优化案例
1、背景
通过KPI指标监控发现目前湘潭电信800M和1.8G全网掉线率较高，选取4月2日-4月6日指标如下：
2、参数优化
4月7日对以下参数进行如下调整：
Parameter name:
Timer poll retransmit
Parameter short
name:
tPollRetr
Short
description:
This parameter specifies the parameter t-pollRetransmit of [36.331]
Full description:  This parameter specifies the parameter t-pollRetransmit of [36.331]
This timer is used by the transmitting side of an AM RLC entity in order to retransmit a poll.
The used minimum value of the timer shall be larger than the calculated round-trip time with considerations of HARQ retransmissions and out-of-sequence arrival. The value of the timer shall be larger than twice of the timerReorder.
Parameter name:  Timer T311
Parameter short
name:
t311
Short
description:
T311 supervises the RRC connection re-establishment.
Full
description:
Timer T311 supervises the RRC connection re-establishment.
Parameter name:
Radio problem indication based on CQI DTX
Parameter short
name:
nCqiDtx
Short
description:
Number of concecutive CQI DTX detections required for RL failure.
Full description:  Number of concecutive CQI DTX detections required for RL failure.
The parameter defines the number of consecutive CQI DTX detections causing radio link
failure indication. Special value 0 means that the feature is disabled.
Parameter name:  Radio problem recovery based on CQI DTX
Parameter short
name:
nCqiRec
Short
description:
Number of concecutive CQIs required for RL recovery.
Full description:  Number of concecutive CQIs required for RL recovery.
The parameter defines number of consecutive CQI non-DTX detections causing radio link
failure recovery indication.
Parameter name:  T imer T301
Parameter short
name:
t301
Short
description:
Timer T301 supervises the RRC connection re-establishment procedure.
Full description:  Timer T301 supervises the RRC connection re-establishment procedure.
Start: Transmission of RRCConnectionReestabilshmentRequest
Stop: Reception of RRCConnectionReestablishment or RRCConnectionReestablishmentReject message as well as when the selected cell becomes unsuitable
At expiry: Go to RRC_IDLE
3、优化结果
➢UE上下文掉线率：800M掉线率从0.24%提升到0.20%，1.8G掉线率从0.20%提升到0.16%。
➢RRC连接重建比例：800M RRC重建比例由1.33%提升到1.17%，1.8G RRC重建比例由0.75%提升到0.72%
易语言字符串转数组➢无线连接成功率：800M无线连接成功率由99.86%提升至99.88%，1.8G无线连接成功率由99.73%提升至99.74%
➢系统内切换成功率：800M切换成功率由98.01%提升至98.11%。1.8G切换成功率由99.89%提升值
99.09%。
4、总结
本次针对掉线率的参数调整，对全网掉线率改善明显，其它KPI指标均保持稳定提升，建议全网推广，。

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