5G问题定位指导书-切换专题.docx_重选门限资源-CSDN文库

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5G 问题定位指导书-切换篇

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目  录
免责说明........................................................................................................................................................6
概述................................................................................................................................................................6
切换原理........................................................................................................................................................6
1 原理概述.............................................................................................................................................6
2 切换类型详述.....................................................................................................................................8
2.1 NR 站内变更...........................................................................................................................9
2.2 NR 站间变更.........................................................................................................................10
2.3 LTE 站内切换.......................................................................................................................11
2.4 LTE 站间切换.......................................................................................................................11
2.5 上下行解耦............................................................................................................................12
3 切换相关参数...................................................................................................................................14
3.1 切换触发事件........................................................................................................................14
3.2 门限值应用............................................................................................................................15
3.3 信令切换参数查看...............................................................................................................17
切换相关 KPI 指标......................................................................................................................................18
NSA 切换问题数据采集.............................................................................................................................18
1 终端侧 Log 采集...............................................................................................................................19
1.1 Probe......................................................................................................................................19
1.2 OMT.......................................................................................................................................19
2 基站侧 log 采集................................................................................................................................19
2.1 信令跟踪................................................................................................................................19
2.2 5G CellDT 跟踪.....................................................................................................................20
2.3 5G 一键式日志......................................................................................................................21
3 核心网 log 采集................................................................................................................................23
信令分析指导..............................................................................................................................................23
1 网络侧分析工具...............................................................................................................................23
1.1 L3 信令..................................................................................................................................24
1.2 Debug 日志............................................................................................................................25
2 终端侧分析工具...............................................................................................................................26
2.1 OMT.......................................................................................................................................26
2.2 Probe......................................................................................................................................27
2.3 Assistant.................................................................................................................................27

3 关键信令及参数...............................................................................................................................28
3.1 NR 测量控制.........................................................................................................................28
切换问题定位指导......................................................................................................................................31
1 切换问题快速排查...........................................................................................................................32
1.1 NR-NR 邻区配置样例..........................................................................................................34
1.2 LTE-NR 邻区配置样例........................................................................................................34
1.3 LTE-LTE 邻区配置样例.......................................................................................................34
1.4 X2 配置样例..........................................................................................................................35
2 切换失败问题定位...........................................................................................................................38
2.1 切换问题定位导图...............................................................................................................38
2.2 UU 接口信令异常.................................................................................................................39
2.3 X2 接口信令异常..................................................................................................................44
2.4 S1 接口信令异常...................................................................................................................45
3 流程交叉场景问题分析...................................................................................................................45
3.1 流程交叉场景识别...............................................................................................................46
3.2 流程交叉场景确认...............................................................................................................46
3.3 流程交叉场景解决方案.......................................................................................................47
4 L2 定位分析指导（随机接入）.....................................................................................................47
4.1 L2 的内部交互流程..............................................................................................................47
4.2 常见的跟踪介绍....................................................................................................................51
5 建议的解决措施...............................................................................................................................54
切换优化指导..............................................................................................................................................55
1 RF 优化.............................................................................................................................................55
2 参数优化...........................................................................................................................................55
案例..............................................................................................................................................................56
1 LTE 站内切换和 NR 变更流程交叉，内部消息发送错误导致 LTE 切换失败.........................56
1.1 问题描述................................................................................................................................56
1.2 处理过程................................................................................................................................57
1.3 根因........................................................................................................................................59
1.4 解决方案................................................................................................................................59
1.5 建议与总结............................................................................................................................59
2 LTE 切换和 NR 变更流程交叉，流程卡死导致掉话...................................................................59
2.1 问题描述................................................................................................................................59