5G無線網(wǎng)絡優(yōu)化實踐

目錄

第1章　網(wǎng)絡概述

1.1 網(wǎng)絡架構(gòu) ··········································6

1.1.1 接入網(wǎng) ·············································7

1.1.2 核心網(wǎng) ·············································9

1.2 頻譜劃分 ·········································14

1.2.1 頻段定義 ·······································14

1.2.2 頻率柵格 ·······································17

1.2.3 同步柵格 ·······································19

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

1.2.5 國內(nèi)5G頻率分配 ·························26

1.3 無線幀結(jié)構(gòu) ·····································27

1.3.1 基本時間單位 ································27

1.3.2 無線幀結(jié)構(gòu) ···································28

1.4 協(xié)議棧 ·············································33

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

1.4.2 用戶面 ···········································40

1.5 組網(wǎng)方式 ·········································43

第2章　物理信道

2.1 物理廣播信道 ··································51

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

2.1.2 PBCH內(nèi)容解析 ····························55

2.2 物理隨機接入信道 ··························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位置定義 ··························63

2.4.2 PDCCH功能分類 ··························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 物理信號 ·········································77

2.8.1 解調(diào)用參考信號 ····························80

2.8.2 探測用參考信號 ····························86

2.8.3 信道狀態(tài)參考信號 ························88

2.8.4 SRS天選 ·······································91

2.9 天線端口 ·········································92

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



IV

第3章　信令流程分析

3.1 隨機接入 ·······································102

3.1.1 競爭模式 ·····································103

3.1.2 非競爭模式 ·································106

3.1.3 RRC連接建立 ·····························107

3.1.4 RRC連接重建 ·····························109

3.1.5 時間提前量 ·································112

3.2 NG連接建立 ·································113

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

3.4 服務質(zhì)量控制 ································123

3.4.1 QoS參數(shù) ·····································124

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

3.5 開機入網(wǎng)流程 ································129

3.5.1 小區(qū)搜索 ·····································129

3.5.2 小區(qū)選擇 ·····································132

3.5.3 小區(qū)重選 ·····································135

3.5.4 注冊登記 ·····································138

3.6 鑒權過程和安全過程 ····················145

3.6.1 鑒權過程 ·····································145

3.6.2 安全過程 ·····································148

3.7 PDU會話過程 ·······························151

3.7.1 PDU會話建立流程 ·····················153

3.7.2 PDU會話資源分配 ·····················159

3.8 業(yè)務建立流程 ································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 切換流程 ·······································179

3.9.1 測量事件的類型 ··························181

3.9.2 切換信令流程 ······························182

3.10 NSA業(yè)務流程 ·····························188

3.10.1 輔站SgNB添加過程 ·················192

3.10.2 主站MeNB變更過程 ················200

3.10.3 輔站SgNB變更過程 ·················201

3.10.4 輔站SgNB調(diào)整過程 ·················204

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

3.11.1 SIB1消息內(nèi)容解析 ···················208

3.11.2 SIB2消息內(nèi)容解析 ···················213

3.11.3 SIB3消息內(nèi)容解析 ···················215

3.11.4 SIB4消息內(nèi)容解析 ···················215

3.11.5 SIB5消息內(nèi)容解析 ···················217

第4章　參數(shù)定義

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　關鍵技術

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

5.2 高階調(diào)制（256QAM） ·················245

5.3 自適應調(diào)制編碼 ····························247

5.4 新型多載波技術 ····························249

5.5 移動邊緣計算 ································251

5.6 網(wǎng)絡切片 ·······································253

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

5.8 服務化架構(gòu) ···································262

5.9 信道編碼（Polar碼和LDPC） ·····263

5.10 CU-DU分離 ································263

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

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

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

第6章　無線網(wǎng)絡優(yōu)化

6.1 優(yōu)化概述 ·······································269

6.2 指標和定義 ···································270

6.3 覆蓋優(yōu)化 ·······································273

6.4 接入性能優(yōu)化 ································275

6.5 掉線率優(yōu)化 ···································281

6.6 切換性能優(yōu)化 ································283

6.7 吞吐率優(yōu)化 ···································286

6.8 地鐵隧道優(yōu)化 ································291

附錄A　鏈路預算 ·················································································297

附錄B　信令流程圖 ·············································································300

附錄C　部分NSA消息 ········································································303

附錄D　NR規(guī)范描述 ···········································································343

附錄E　常用術語 ·················································································346

參考文獻 ······························································································355