【資料成文時間】：2005-3-2
【語言】：中文
【頁數(shù)】：35
【何人（公司）所著】：NOKIA
【文件格式】：PDF
【文件原名】：GPRS系統(tǒng)優(yōu)化原則（無線優(yōu)化部分）
【摘要或目錄】：
目錄
1. GPRS無線網(wǎng)優(yōu)化主要流程和內(nèi)容..................................................................................................4
2. GSM網(wǎng)絡(luò)數(shù)據(jù)檢查.........................................................................................................................5
3. GPRS網(wǎng)絡(luò)配置容量檢查分析.........................................................................................................5
3.1 GPRS無線擁塞情況.................................................................................................................5
3.2 GB負(fù)荷檢查...........................................................................................................................10
4. GPRS網(wǎng)絡(luò)參數(shù)設(shè)置檢查分析.......................................................................................................10
4.1 常規(guī)參數(shù)................................................................................................................................11
4.1.1 GENA/GTRX/CDED/CDEF/PC參數(shù)...............................................................................11
4.1.2 PAPU的分配歸屬合理性分析..........................................................................................11
4.1.3 NSEI的分配....................................................................................................................13
4.1.4 CS1,2選擇控制參數(shù)(DLBH,ULBH,COD,CODH)............................................................13
4.1.5 手機(jī)重選控制 參數(shù)..........................................................................................................14
4.2 PA File中參數(shù)的微調(diào).............................................................................................................14
4.2.1 有關(guān)TBF定時器的調(diào)整....................................................................................................14
4.3 PR File中參數(shù)的介紹.............................................................................................................15
4.3.1 FlowControl參數(shù).............................................................................................................15
4.3.2 RLC傳送控制參數(shù)...........................................................................................................16
5. OMC KPI調(diào)查評測和分析.............................................................................................................17
5.1 GPRS接入性能優(yōu)化...............................................................................................................17
5.1.1 RACH申請上行TBF的首次接入成功率(Pi_2)..................................................................17
5.1.2 GPRS功能吊死小區(qū)........................................................................................................17
5.2 GPRS時隙分配使用性能........................................................................................................18
5.2.1 上下行時隙請求分配率...................................................................................................18
5.2.2 TBF的重新分配的性能....................................................................................................18
5.2.3 平均GPRS域大小(ava_16).............................................................................................19
5.2.4 上下行TBF掉線率(tbf_28b).............................................................................................19
5.3 GPRS編碼方式性能...............................................................................................................23
5.3.1 誤塊率 (BLER)................................................................................................................23
5.3.2 CS2編碼占用比率..........................................................................................................24
5.4 GPRS移動管理性能...............................................................................................................24
5.4.1 Ready狀態(tài)下的小區(qū)重選................................................................................................24
5.4.2 路由區(qū)更新.....................................................................................................................25
5.5 GPRS會話管理性能...............................................................................................................25
5.5.1 PDP激活和去激活..........................................................................................................25
6. GPRS基準(zhǔn)測試(路測,CQT)和分析................................................................................................26
6.1 用戶數(shù)據(jù)傳輸速率和優(yōu)化.......................................................................................................26
6.2 下行高BLER和優(yōu)化................................................................................................................27
6.3 RLC重傳率指標(biāo)定義和優(yōu)化...................................................................................................27
6.4 PDP激活去活的耗時分析.......................................................................................................28
6.5 路測中較長的空閑時間...........................................................................................................29
6.6 RA 更新時的時延分析............................................................................................................30
7. 附錄：.........................................................................................................................................30
7.1 NOKIA網(wǎng)絡(luò)GPRS常用KPI和公式..........................................................................................30
7.1.1 上行時隙分配擁塞率(tbf_15)...........................................................................................30

7.1.2 下行時隙分配擁塞率(tbf_16)...........................................................................................30
7.1.3 上行TBF因?yàn)镃S話務(wù)釋放率(tbf_19)...............................................................................30
7.1.4 下行TBF因?yàn)镃S話務(wù)釋放率(tbf_20)...............................................................................31
7.1.5 下行時隙分配率(msl_16*)...............................................................................................31
7.1.6 平均下行時隙請求數(shù)(msl_14*)........................................................................................31
7.1.7 平均GPRS時隙數(shù)(ava_16).............................................................................................31
7.1.8 GPRS域升級請求數(shù)(001174).........................................................................................32
7.1.9 GPRS域升級拒絕率(blck_22).........................................................................................32
7.1.10 RLC總流量(trf_90)..........................................................................................................32
7.1.11 RLC有效流量(trf_74a)....................................................................................................32
7.1.12 上行時隙分配率(msl_15).............................................................................................32
7.1.13 上行平均每時隙TBF數(shù)................................................................................................33
7.1.14 下行平均每時隙TBF數(shù)................................................................................................33
7.1.15 RACH一次接入成功率(Pi_2)..........................................................................................33
7.1.16 上行時隙請求分配率(msl_5).......................................................................................33
7.1.17 下行時隙請求分配率(msl_6).......................................................................................33
7.1.18 上行TBF重新分配率(Pi_22)........................................................................................33
7.1.19 上行TBF重新分配失敗率(Pi_23).................................................................................33
7.1.20 下行TBF重新分配率(Pi_24)........................................................................................34
7.1.21 下行TBF重新分配失敗率(Pi_25).................................................................................34
7.1.22 下行CS2的誤塊率(rlc_13)..........................................................................................34
7.1.23 下行CS2的占用率 (rlc_9a).........................................................................................34
7.1.24 PDP激活失敗率(s_5)......................................................................................................34
7.1.25 PDP去激活失敗率(s_6)..................................................................................................34
7.1.26 下行TBF掉線率tbf_28b)............................................................................................35
7.1.27 UL TBF releases due to flush: (tbf_35)..........................................................................35
7.1.28 DL TBF releases due to flush: (tbf_36)..........................................................................35
7.1.29 C072031 DL_TBF_REALLOC_DUE_SIM_UL_TBF......................................................35
7.2 NOKIA網(wǎng)絡(luò)GPRS常用參數(shù)......................................................................................................35
圖表 1：GPRS優(yōu)化流程.......................................................................................................................4
圖表 2：CDEF配置..............................................................................................................................6
圖表 3：GPRS無線擁塞小區(qū)判斷流程.................................................................................................7
圖表 4: NSEI調(diào)整前后分布圖............................................................................................................13
圖表 5：LAC邊界處的高TBF掉線......................................................................................................19
圖表 6：測試中的下行RLC層傳送圖..................................................................................................28