【資料名稱】：中國移動(dòng)集團(tuán)網(wǎng)絡(luò)優(yōu)化技術(shù)培訓(xùn)內(nèi)容

【資料作者】：chinamobile

【資料日期】：2010

【資料語言】：中文

【資料格式】：PPT

【資料目錄和簡介】：

中國移動(dòng)網(wǎng)絡(luò)優(yōu)化技術(shù)培訓(xùn)班課程
目錄
1掉話分析...................................................................................................................................3
1.1GSM系統(tǒng)掉話案例分析..........................................................................................3
1.1.1掉話的形式.......................................................................................................3
1.1.2無線掉話的原因...............................................................................................3
1.1.3掉話處理流程...................................................................................................3
1.1.4掉話分析...........................................................................................................4
2分配失敗率...............................................................................................................................9
2.1指配的基本信令流程...............................................................................................9
2.2指配過程常見問題...................................................................................................9
3SDCCH、TCH擁塞分析.......................................................................................................10
3.1SDCCH擁塞...........................................................................................................10
3.2TCH擁塞.................................................................................................................11
3.3SDCCH信道擁塞...................................................................................................12
3.3.1硬件故障.........................................................................................................12
3.3.2頻繁位置更新.................................................................................................13
3.3.3由于話務(wù)量較高導(dǎo)致SDCCH擁塞................................................................13
3.3.4鄰小區(qū)故障導(dǎo)致SDCCH擁塞........................................................................13
3.4TCH信道擁塞.........................................................................................................13
3.4.1硬件、傳輸故障.............................................................................................14
3.4.2高話務(wù)小區(qū)TCH擁塞.....................................................................................14
3.4.3頻繁切換導(dǎo)致TCH擁塞.................................................................................14
4RACH接入的有效性..............................................................................................................14
4.1什么是RACH接入有效..........................................................................................14
4.2影響有效RACH接入的因素---- “信道請(qǐng)求消息”碰撞...............................15
4.3RACH接入常見的問題..........................................................................................16
4.3.1解碼的RACH請(qǐng)求數(shù)很少..............................................................................16
4.3.2在高電平下，仍無法解調(diào)出正確的信號(hào)（即解調(diào)出的信息編碼錯(cuò)誤）.17
4.3.3 LAPDm建立成功率低...................................................................................17
4.4故障處理流程.........................................................................................................18
4.4.1確認(rèn)故障的起始時(shí)間.....................................................................................18
4.4.2確認(rèn)硬件是否有問題，及時(shí)排除硬件故障.................................................18
4.4.3消除干擾.........................................................................................................18
5切換觸發(fā)原因所占比例分析.................................................................................................19
5.1切換的信令流程；.................................................................................................19
5.1.1異步切換信令流程；.....................................................................................19
5.1.2同步切換信令流程；.....................................................................................19
5.2切換判斷算法；.....................................................................................................20
5.2.1切換觸發(fā)機(jī)制；.............................................................................................20
5.2.2目標(biāo)小區(qū)的篩選和排序.................................................................................21
5.3話務(wù)報(bào)表中切換方面的分析.................................................................................21
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5.3.1切換觸發(fā)原因的分析；.................................................................................21
5.3.2切換成功率的分析.........................................................................................21
5.4切換參數(shù)設(shè)置策略；.............................................................................................22
5.4.1基本設(shè)置策略；.............................................................................................22
5.4.2雙頻網(wǎng)及微蜂窩的設(shè)置策略.........................................................................22
5.5切換方面常見問題；.............................................................................................23
5.5.1路測(cè)常見問題；.............................................................................................23
5.5.2參數(shù)設(shè)置常見錯(cuò)誤.........................................................................................23
5.5.3交換方面常見錯(cuò)誤.........................................................................................23
5.5.4鄰區(qū)設(shè)置常見錯(cuò)誤.........................................................................................24
6小區(qū)無話務(wù)量或切入分析.....................................................................................................24
6.1無話務(wù)量或話務(wù)量過低.........................................................................................24
6.2小區(qū)無切入.............................................................................................................24
7射頻（RF）優(yōu)化分析............................................................................................................25
7.1上行鏈路的干擾檢測(cè).............................................................................................25
7.2下行鏈路的干擾檢測(cè).............................................................................................25
7.3上、下鏈路平衡驗(yàn)證.............................................................................................26
8基站覆蓋范圍縮小分析.........................................................................................................26
8.1天饋系統(tǒng)對(duì)覆蓋范圍的影響：.............................................................................26
8.2基站硬件設(shè)備對(duì)覆蓋范圍的影響：.....................................................................28
8.3參數(shù)設(shè)置對(duì)基站覆蓋范圍的影響：.....................................................................29
9長途來話接通率.....................................................................................................................31
9.1長途來話呼損分析.................................................................................................31
9.2對(duì)各類長話呼損的優(yōu)化措施.................................................................................34
9.2.1減少尋呼無響應(yīng).............................................................................................34
9.2.2減少通信鏈路建立失敗.................................................................................35
9.3其他呼損原因分析.................................................................................................37
9.3.1主叫用戶提前掛機(jī).........................................................................................37
9.3.2撥號(hào)不全.........................................................................................................37