5G无线网络优化实践

目录

第1章　网络概述

1.1 网络架构 ··········································6

1.1.1 接入网 ·············································7

1.1.2 核心网 ·············································9

1.2 频谱划分 ·········································14

1.2.1 频段定义 ·······································14

1.2.2 频率栅格 ·······································17

1.2.3 同步栅格 ·······································19

1.2.4 BWP概念 ······································23

1.2.5 国内5G频率分配 ·························26

1.3 无线帧结构 ·····································27

1.3.1 基本时间单位 ································27

1.3.2 无线帧结构 ···································28

1.4 协议栈 ·············································33

1.4.1 控制面 ···········································34

1.4.2 用户面 ···········································40

1.5 组网方式 ·········································43

第2章　物理信道

2.1 物理广播信道 ··································51

2.1.1 PBCH位置 ····································51

2.1.2 PBCH内容解析 ····························55

2.2 物理随机接入信道 ··························57

2.3 物理上行控制信道 ··························60

2.4 物理下行控制信道 ··························63

2.4.1 PDCCH位置定义 ··························63

2.4.2 PDCCH功能分类 ··························70

2.5 物理下行共享信道 ··························72

2.6 物理上行共享信道 ··························74

2.7 物理共享信道分配 ··························75

2.8 物理信号 ·········································77

2.8.1 解调用参考信号 ····························80

2.8.2 探测用参考信号 ····························86

2.8.3 信道状态参考信号 ························88

2.8.4 SRS天选 ·······································91

2.9 天线端口 ·········································92

2.10　波束管理 ·······································95



IV

第3章　信令流程分析

3.1 随机接入 ·······································102

3.1.1 竞争模式 ·····································103

3.1.2 非竞争模式 ·································106

3.1.3 RRC连接建立 ·····························107

3.1.4 RRC连接重建 ·····························109

3.1.5 时间提前量 ·································112

3.2 NG连接建立 ·································113

3.3 RRC重配置 ··································119

3.4 服务质量控制 ································123

3.4.1 QoS参数 ·····································124

3.4.2 QoS映射 ·····································127

3.5 开机入网流程 ································129

3.5.1 小区搜索 ·····································129

3.5.2 小区选择 ·····································132

3.5.3 小区重选 ·····································135

3.5.4 注册登记 ·····································138

3.6 鉴权过程和安全过程 ····················145

3.6.1 鉴权过程 ·····································145

3.6.2 安全过程 ·····································148

3.7 PDU会话过程 ·······························151

3.7.1 PDU会话建立流程 ·····················153

3.7.2 PDU会话资源分配 ·····················159

3.8 业务建立流程 ································161

3.8.1 主叫流程 ·····································161

3.8.2 被叫流程 ·····································170

3.8.3　EPS fallback流程 ························174

3.9 切换流程 ·······································179

3.9.1 测量事件的类型 ··························181

3.9.2 切换信令流程 ······························182

3.10 NSA业务流程 ·····························188

3.10.1 辅站SgNB添加过程 ·················192

3.10.2 主站MeNB变更过程 ················200

3.10.3 辅站SgNB变更过程 ·················201

3.10.4 辅站SgNB调整过程 ·················204

3.11 空口主要消息 ······························205

3.11.1 SIB1消息内容解析 ···················208

3.11.2 SIB2消息内容解析 ···················213

3.11.3 SIB3消息内容解析 ···················215

3.11.4 SIB4消息内容解析 ···················215

3.11.5 SIB5消息内容解析 ···················217

第4章　参数定义

4.1 NCGI ·············································220

4.2 PCI ················································220

4.3 SUPI ··············································221

4.4 5G-GUTI ·······································224

4.5 5G-S-TMSI ····································225

4.6 RNTI ·············································225

4.7 5GS TAI ········································227

4.8 S-NSSAI ········································228

4.9 PRACH ·········································229

4.10 RSRP和RSRQ ···························237

4.11 APN和DNN ·······························239



V

第5章　关键技术

5.1 mMIMO ········································242

5.2 高阶调制（256QAM） ·················245

5.3 自适应调制编码 ····························247

5.4 新型多载波技术 ····························249

5.5 移动边缘计算 ································251

5.6 网络切片 ·······································253

5.7 上下行解耦 ···································258

5.8 服务化架构 ···································262

5.9 信道编码（Polar码和LDPC） ·····263

5.10 CU-DU分离 ································263

5.11 CU云化部署 ·······························264

5.12 D2D ·············································265

5.13 NOMA ·········································266

第6章　无线网络优化

6.1 优化概述 ·······································269

6.2 指标和定义 ···································270

6.3 覆盖优化 ·······································273

6.4 接入性能优化 ································275

6.5 掉线率优化 ···································281

6.6 切换性能优化 ································283

6.7 吞吐率优化 ···································286

6.8 地铁隧道优化 ································291

附录A　链路预算 ·················································································297

附录B　信令流程图 ·············································································300

附录C　部分NSA消息 ········································································303

附录D　NR规范描述 ···········································································343

附录E　常用术语 ·················································································346

参考文献 ······························································································355