5G無(wú)線(xiàn)網(wǎng)絡(luò)優(yōu)化實(shí)踐

目錄

第1章　網(wǎng)絡(luò)概述

1.1 網(wǎng)絡(luò)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(guó)內(nèi)5G頻率分配 ·························26

1.3 無(wú)線(xiàn)幀結(jié)構(gòu) ·····································27

1.3.1 基本時(shí)間單位 ································27

1.3.2 無(wú)線(xiàn)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(hù)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(jī)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(lèi) ··························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(hào) ·········································77

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

2.8.2 探測(cè)用參考信號(hào) ····························86

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

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

2.9 天線(xiàn)端口 ·········································92

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



IV

第3章　信令流程分析

3.1 隨機(jī)接入 ·······································102

3.1.1 競(jìng)爭(zhēng)模式 ·····································103

3.1.2 非競(jìng)爭(zhēng)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(shí)間提前量 ·································112

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

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

3.4 服務(wù)質(zhì)量控制 ································123

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

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

3.5 開(kāi)機(jī)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(cè)登記 ·····································138

3.6 鑒權(quán)過(guò)程和安全過(guò)程 ····················145

3.6.1 鑒權(quán)過(guò)程 ·····································145

3.6.2 安全過(guò)程 ·····································148

3.7 PDU會(huì)話(huà)過(guò)程 ·······························151

3.7.1 PDU會(huì)話(huà)建立流程 ·····················153

3.7.2 PDU會(huì)話(huà)資源分配 ·····················159

3.8 業(yè)務(wù)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(cè)量事件的類(lèi)型 ··························181

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

3.10 NSA業(yè)務(wù)流程 ·····························188

3.10.1 輔站SgNB添加過(guò)程 ·················192

3.10.2 主站MeNB變更過(guò)程 ················200

3.10.3 輔站SgNB變更過(guò)程 ·················201

3.10.4 輔站SgNB調(diào)整過(guò)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(guān)鍵技術(shù)

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

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

5.3 自適應(yīng)調(diào)制編碼 ····························247

5.4 新型多載波技術(shù) ····························249

5.5 移動(dòng)邊緣計(jì)算 ································251

5.6 網(wǎng)絡(luò)切片 ·······································253

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

5.8 服務(wù)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(wú)線(xiàn)網(wǎng)絡(luò)優(yōu)化

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

6.2 指標(biāo)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(xiàn)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(yù)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(shù)語(yǔ) ·················································································346

參考文獻(xiàn) ······························································································355