 Call MS2 Handover M$2 Handover Failur MS2 Cell Color: Servir Serving cell Neighber cells Serving-te-neighbor Cell Theme[14] Color Radius MS2 Cell Line Serving Serving cell line Figure 2.16 Drive test result analysis showing handovers (HO) on the path Cellname CGI (MCC, MNC, LAC, CI) 12001 12095 Cell GPRS Support BCCH ARFCN TCH ARFCN Dedicated Time slot Channel type TCH/F + FACCH/F and SACCH/F Channel mode Speech full rate or half rate version I Speech Codec Ciphering Algorithm Sub channel number Hopping channel Hopping frequencies Value ARFON Mobile Allocation Index Rxler Sub (dBm) Value ARFCN Offset (MAIO) Neighbor RxLev (d. 05:57:24.95 Hopping sequence number Neighbor Rxley (d. Cell Name (HSN) C/1 Worst [0] 21.70 Figure 2.17 Some drive test results RADIO NETWORK PLANNING AND OPTIMISATION Network Management System Statistics After the launch of the network, drive tests are performed periodically. In contrast, the statistics are monitored on the NMS daily with the help of counters. The NMS usually mea- sures the functionalities such as call setup failures, dropped calls, and handovers (successes and failures). It also gives data related to traffic and blocking in the radio network, apart from giving data related to quality issues such as frequency hopping, FER and BER, field strength, etc. An example of area-level KPI statistics is shown in Figure 2.18. SDCCH SDCCH availability /ava_4 81.30% Dynamic SDCCH allocation (TCH reconfigured to SDCCH): Attempts /c1154 SDCCH requests /c1000 HO in /c1006 0 ( 0.00%) blocked /blck_15 (blck_5a) 33 ( 0.50%) To FACCH call setup /c1099 0 ( 0.00%) /c3019 4102 ( 61.99 %) MTC (incl. SMS) /c3012 145 ( 2.19%) MOC (incl. SMS,SS) /c3013 343 ( 5.18%) supplementary service request (S9) /c3044 4 ( 0.06%) IMSI detach (S7) /c3033 114 ( 1.72%) call re-establishment /c3020 0 ( 0.00%) emergency call /c3021 255 ( 3.85%) other (fails, ghosts) /sd_la 1625 ( 24.56%) SDCCH usage /trf_7b 0.02 % Average SDCCH seizure length /trf_4 2.05 sec SDCCH failures SDCCH seizures /trf_54 SDCCH drop ratio /sdr_