目錄
第1 章 概述...............................................................................................................................................1-1
1.1 第2 代移動(dòng)通信技術(shù)的演進(jìn).........................................................................................................1-1
1.2 未來(lái)移動(dòng)通信技術(shù)的發(fā)展方向.....................................................................................................1-3
第2 章 GSM 系統(tǒng).....................................................................................................................................2-1
2.1 GSM 的定義....................................................................................................................................2-1
2.2 GSM 的特點(diǎn)....................................................................................................................................2-2
2.3 GSM 標(biāo)準(zhǔn)規(guī)范................................................................................................................................2-3
2.4 GSM 網(wǎng)絡(luò)結(jié)構(gòu)................................................................................................................................2-4
2.4.1 移動(dòng)交換系統(tǒng)NSS...............................................................................................................2-5
2.4.2 基站子系統(tǒng)BSS ...................................................................................................................2-6
2.4.3 操作維護(hù)子系統(tǒng)OMS..........................................................................................................2-6
2.4.4 移動(dòng)臺(tái)MS ............................................................................................................................2-6
2.4.5 網(wǎng)絡(luò)服務(wù)區(qū)...........................................................................................................................2-7
2.5 GSM 協(xié)議平臺(tái)................................................................................................................................2-8
2.5.1 GSM 系統(tǒng)的各種接口...........................................................................................................2-8
2.5.2 GSM 系統(tǒng)接口協(xié)議模型.......................................................................................................2-9
2.6 幀結(jié)構(gòu)和無(wú)線信道....................................................................................................................... 2-11
2.6.1 無(wú)線幀結(jié)構(gòu)......................................................................................................................... 2-11
2.6.2 物理信道.............................................................................................................................2-12
2.6.3 邏輯信道.............................................................................................................................2-12
2.6.4 信道組合.............................................................................................................................2-15
2.6.5 邏輯信道和物理信道的映射.............................................................................................2-16
2.7 關(guān)鍵技術(shù)......................................................................................................................................2-20
2.7.1 頻道分配和頻率復(fù)用.........................................................................................................2-20
2.7.2 非連續(xù)發(fā)送（DTX） .........................................................................................................2-24
2.7.3 GMSK 調(diào)制..........................................................................................................................2-24
2.7.4 信道編碼和交織.................................................................................................................2-25
2.7.5 交織和解交織.....................................................................................................................2-25
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2.7.6 加密和解密......................................................................................................................... 2-28
2.7.7 跳頻技術(shù)............................................................................................................................. 2-29
2.7.8 分集接收............................................................................................................................. 2-30
2.7.9 功率控制............................................................................................................................. 2-31
2.7.10 時(shí)間提前量....................................................................................................................... 2-34
2.8 基本信令流程............................................................................................................................... 2-35
2.8.1 手機(jī)位置更新流程............................................................................................................. 2-35
2.8.2 手機(jī)關(guān)機(jī)流程..................................................................................................................... 2-36
2.8.3 移動(dòng)主叫以及被叫掛機(jī)流程............................................................................................. 2-37
2.8.4 移動(dòng)被叫以及主叫掛機(jī)流程............................................................................................. 2-39
2.8.5 小區(qū)內(nèi)內(nèi)部切換流程......................................................................................................... 2-41
2.8.6 小區(qū)間內(nèi)部切換流程......................................................................................................... 2-41
2.8.7 功率控制信令流程............................................................................................................. 2-42
第3 章 GPRS 技術(shù)................................................................................................................................... 3-1
3.1 GPRS 的定義.................................................................................................................................. 3-1
3.2 GPRS 的特點(diǎn).................................................................................................................................. 3-1
3.3 GPRS 標(biāo)準(zhǔn)規(guī)范............................................................................................................................... 3-2
3.4 GPRS 網(wǎng)絡(luò)結(jié)構(gòu)............................................................................................................................... 3-3
3.5 GPRS 協(xié)議平臺(tái)............................................................................................................................... 3-4
3.5.1 GPRS 傳輸協(xié)議平臺(tái)............................................................................................................. 3-4
3.5.2 GPRS 信令協(xié)議平臺(tái)............................................................................................................. 3-7
3.6 幀結(jié)構(gòu)和無(wú)線信道....................................................................................................................... 3-10
3.6.1 無(wú)線幀結(jié)構(gòu)......................................................................................................................... 3-10
3.6.2 物理信道............................................................................................................................. 3-10
3.6.3 邏輯信道............................................................................................................................. 3-11
3.6.4 信道組合............................................................................................................................. 3-12
3.6.5 邏輯信道和物理信道的映射............................................................................................. 3-13
3.7 GPRS 關(guān)鍵技術(shù)............................................................................................................................. 3-17
3.7.1 QOS 的實(shí)現(xiàn)......................................................................................................................... 3-17
3.7.2 媒體接入控制層（MAC）................................................................................................ 3-17
3.7.3 無(wú)線塊結(jié)構(gòu)......................................................................................................................... 3-18
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3.7.4 信道編碼.............................................................................................................................3-19
3.7.5 流量控制.............................................................................................................................3-22
3.7.6 小區(qū)選擇和重選.................................................................................................................3-23
3.7.7 功率控制.............................................................................................................................3-26
附錄A 縮略語(yǔ)..........................................................................................................................................A-1