50267584 celldoctor

BSS Network Doctor Formulas

DN98619493 © Nokia Networks Oy 1 (206)
Issue 1-1 en Nokia Proprietary and Confidential


The information in this document is subject to change without notice and describes only the
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However, Nokia Networks has made all reasonable efforts to ensure that the instructions
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Copyright © Nokia Networks Oy 2001. All rights reserved.

2 (206) © Nokia Networks Oy DN98619493
Nokia Proprietary and Confidential Issue 1-1 en

Contents

Contents 3

List of tables 5

List of figures 6

1 About this manual 27
1.1 What you need to know first 27
1.2 Where to find more 28
1.3 Typographic conventions 28
1.3.1 Text styles 28
1.4 Terms and concepts 29
1.4.1 Abbreviations 29
1.4.2 Terms 31

2 BSS counter formulas 33
2.1 Additional GPRS channels (ach) 33
2.2 Multislot (msl) 35
2.3 TBF (tbf) 38
2.4 RLC (rlc) 42
2.5 Frame relay (frl) 46
2.6 Random access (rach) 47
2.7 SDCCH drop failures (sd) 49
2.7.1 SDCCH drop counters 50
2.7.2 Problems with the SDCCH drop counters 52
2.8 SDCCH drop ratio (sdr) 53
2.9 Setup success ratio (cssr) 54
2.10 TCH drop failures 55
2.10.1 TCH drop call counters 55
2.10.2 Drop call ratio 58
2.10.3 Drop-out ratio 58
2.10.4 Problems with the drop call counters 59
2.11 Drop call failures (dcf) 59
2.12 TCH drop call % (dcr) 60
2.13 Handover (ho) 71
2.14 Handover failure % (hfr) 83
2.15 Handover success % (hsr) 108
2.16 Handover failures (hof) 113
2.17 Interference (itf) 117
2.18 Congestion (cngt) 118
2.19 Queuing (que) 120
2.20 Blocking (blck) 123
2.21 Traffic (trf) 133
2.22 Traffic directions 160
2.22.1 Mobile originated calls (moc) 160
2.22.2 Mobile terminated calls (mtc) 162
2.23 Paging (pgn) 164
2.24 Short message service (sms) 166



2.25 Directed retry (dr) 168
2.26 Availability (ava) 170
2.27 Unavailability (uav) 174
2.28 Location updates (lu) 177
2.29 LU success % (lsr) 177
2.30 Emergency call (ec) 178
2.31 Emergency call success % (ecs) 178
2.32 Call re-establishment (re) 179
2.33 Call re-establishment success % (res) 179
2.34 Quality 179
2.34.1 Downlink quality (dlq) 179
2.34.2 Uplink quality (ulq) 180
2.35 Downlink and uplink level 182
2.35.1 Downlink level (dll) 182
2.35.2 Uplink level (ull) 182
2.36 Power (pwr) 182
2.37 Level (lev) 183
2.38 Distance (dis) 184
2.39 Link balance, power, level (lb) 184
2.40 Call success (csf) 187
2.41 Configuration (cnf) 202

3 Missing Counters 203
3.1 XX1 203
3.2 XX2 203
3.3 XX3 203
3.4 XX4 204

Index 205


List of tables

Table 1. Text styles in this document 29
Table 2. Abbreviations 29
Table 3. Terms used in this document 31
Table 4. SDCCH Drop Counters 51
Table 5. TCH drop call counters 56



List of figures

Figure 1. Additional GPRS channel use, S9PS (ach_1) 34
Figure 2. Average additional GPRS channel hold time, S9PS (ach_2) 34
Figure 3. Additional GPRS channels seized, S9PS (ach_3) 34
Figure 4. Total additional GPRS channel hold time, S9PS (ach_4) 34
Figure 5. Distribution of UL multislot requests, S9PS (msl_1) 35
Figure 6. Distribution of DL multislot requests, S9PS (msl_2) 35
Figure 7. Distribution of UL multislot allocations, S9PS (msl_3) 35
Figure 8. Distribution of DL multislot allocations, S9PS (msl_4) 36
Figure 9. UL multislot allocations, S9PS (msl_9) 36
Figure 10. DL multislot allocations, S9PS (msl_10) 36
Figure 11. Average number of allocated timeslots, UL S9PS (msl_11) 36
Figure 12. Average number of allocated timeslots, DL S9PS (msl_13) 37
Figure 13. Average number of requested UL timeslots, S9PS (msl_13) 37
Figure 14. Average number of requested DL timeslots, S9PS (msl_14) 37
Figure 15. UL multislot allocation %, S9PS (msl_15) 37
Figure 16. DL multislot allocation %, S9PS (msl_16) 38
Figure 17. UL multislot requests, S9PS (msl_17) 38
Figure 18. DL multislot requests, S9PS (msl_18) 38
Figure 19. Average number of LLC blocks per UL TBF, S9PS (tbf_3) 39
Figure 20. Average number of LLC blocks per DL TBF, S9PS (tbf_4) 39
Figure 21. Average UL TBF duration, S9PS (tbf_5) 39
Figure 22. Average UL TBF duration, S9PS (tbf_5a) 39
Figure 23. Average DL TBF duration, S9PS (tbf_6a) 40
Figure 24. Average UL TBF duration, unack mode, S9PS (tbf_7) 40
Figure 25. Average DL TBF duration, unack mode, S9PS (tbf_8) 40
Figure 26. UL mlslot allocation blocking, S9PS (tbf_15) 40
Figure 27. DL mlslot allocation blocking, S9PS 41
Figure 28. Normally released UL TBF ratio, S9PS (tbf_25) 41
Figure 29. Normally released DL TBF ratio, S9PS (tbf_26) 41


Figure 30. UL TBF reallocation failure ratio, S9PS (tbf_29) 42
Figure 31. DL TBF reallocation failure ratio, S9PS (tbf_30) 42
Figure 32. UL TBF reallocation attempts, S9PS (tbf_31) 42
Figure 33. DL TBF reallocation attempts, S9PS (tbf_32) 42
Figure 34. Ack.CS1 RLC blocks UL, S9PS (rlc_1) 43
Figure 35. Ack.CS1 RLC blocks DL, S9PS (rlc_2) 43
Figure 36. Ack. CS1 RLC DL Block error rate, S9PS (rlc_3a) 43
Figure 37. Unack. CS1 RLC UL block error rate, S9PS (rlc_4a) 43
Figure 38. Ack. CS1 RLC UL block error rate, S9PS (rlc_5a) 43
Figure 39. UL CS1 RLC data share, S9PS (rlc_6) 44
Figure 40. UL CS2 RLC data share, S9PS 44
Figure 41. DL CS1 RLC data share, S9PS (rlc_8) 44
Figure 42. DL CS2 RLC data share, S9PS (rlc_9) 44
Figure 43. UL CS1 RLC block error rate, S9PS (rlc_10) 45
Figure 44. UL CS2 RLC block error rate, S9PS (rlc_11) 45
Figure 45. DL CS1 RLC block error rate, S9PS (rlc_12) 45
Figure 46. DL CS2 RLC block error rate, S9PS (rlc_13) 45
Figure 47. UL RLC blocks, S9PS (rlc_14) 46
Figure 48. DL RLC blocks, S9PS (rlc_15) 46
Figure 49. Bytes in discarded sent frames, S9PS (frl_5) 46
Figure 50. Bytes in discarded received frames, S9PS (frl_6) 46
Figure 51. Average RACH slot, S1 (rach_1) 47
Figure 52. Peak RACH load, average, S1 (rach_2) 47
Figure 53. Peak RACH load %, S1 (rach_3) 47
Figure 54. Average RACH load %, S1 (rach_4) 48
Figure 55. Average RACH busy, S1 (rach_5) 48
Figure 56. RACH rejected due to illegal establishment, S5 (rach_6) 48
Figure 57. Total RACH rejection ratio, S7 (rach_7) 49
Figure 58. Ghosts detected on SDCCH and other failures, S1 (sd_1) 49
Figure 59. Ghosts detected on SDCCH and other failures, S1 (sd_1a) 50
Figure 60. Ghosts detected on SDCCH and other failures, S1 (sd_1b) 50



Figure 61. SDCCH Drop %, S3 (sdr_1a) 53
Figure 62. SDCCH Drop %, abis fail excluded, S3 (sdr_2) 54
Figure 63. Illegal establishment cause %, (sdr_3b) 54
Figure 64. SDCCH, TCH Setup Success %, S4 (cssr_2) 55
Figure 65. TCH drop calls in HO, S2 (dcf_2) 59
Figure 66. TCH drop calls in BSC outgoing HO, S3 (dcf_3) 59
Figure 67. TCH drop calls in intra-cell HO, S3 (dcf_4) 60
Figure 68. TCH drop calls in intra BSC HO, S3 (dcf_6) 60
Figure 69. Drop calls in BSC incoming HO, S3 (dcf_7) 60
Figure 70. TCH drop call %, area, real, after re-establishment S3 (dcr_3f) 61
Figure 71. TCH drop call %, area, real, before re-establishment, S3 (dcr_3g) 62
Figure 72. TCH drop call %, area, real, after re-establishment, S7 (dcr_3h) 62
Figure 73. TCH drop call %, area, real, before re-establishment, S3 (dcr_3i) 63
Figure 74. TCH drop call %, area, real, after re-establishment, S7 (dcr_3j) 65
Figure 75. TCH drop-out %, BTS level, before call re-establishment, S3 (dcr_4c) 65
Figure 76. TCH drop-out %, BTS level, before call re-establishment, S3 (dcr_4d) 66
Figure 77. TCH drop-out %, BTS level, before call re-establishment, S7 (dcr_4e) 66
Figure 78. TCH drop-out %, BTS level, before call re-establishment, S7 (dcr_4f) 67
Figure 79. TCH drop call (dropped conversation) %, BSC level, S4 (dcr_5) 68
Figure 80. TCH dropped conversation %, area, re-establishment considered, S7
(dcr_5b) 69
Figure 81. TCH drop call %, after TCH assignment, without re-establishment, area
level, S7 (dcr_8) 69
Figure 82. TCH drop call %, after TCH assignment, with re-establishment, area level,
S7 (dcr_8b) 69
Figure 83. Drops per erlang , before re-establishment, S4 (dcr_10) 70
Figure 84. Drops per erlang , after re-establishment, S4 (dcr_10a) 70
Figure 85. Drops per erlang , after re-establishment, S7 (dcr_10b) 71
Figure 86. Return from super TRXs to regular TRX, S4 (ho_1) 71
Figure 87. HO attempts from regular TRXs to super, S4 (ho_2) 71
Figure 88. HO attempts from super to regular, S4 (ho_3) 71
Figure 89. Share of HO attempts from super to regular due to DL Qual, S4
(ho_4) 72


Figure 90. Share of HO attempts from super to regular due to DL interference, S4
(ho_5) 72
Figure 91. Share of HO attempts from super to regular due to UL interference, S4
(ho_6) 72
Figure 92. Share of HO attempts from super to regular due to bad C/I, S4 (ho_7) 73
Figure 93. MSC incoming HO attempts, (ho_8) 73
Figure 94. MSC outgoing HO attempts, (ho_9) 73
Figure 95. BSC incoming HO attempts, (ho_10) 73
Figure 96. BSC outgoing HO attempts, (ho_11) 73
Figure 97. Intra-cell HO attempts, S2 (ho_12a) 74
Figure 98. HO attempts, , outgoing and intra-cell S4, (ho_13) 74
Figure 99. HO attempts S3, (ho_13a) 74
Figure 100. HO attempts, outgoing and intra-cell, S5, (ho_13c) 74
Figure 101. HO attempts, outgoing and intra-cell, S6, (ho_13d) 75
Figure 102. HO attempts , outgoing and intra-cell S3, (ho_13e) 75
Figure 103. HO attempts , outgoing and intra-cell S9, (ho_13f) 75
Figure 104. TCH requests for HO (ho_14a) 76
Figure 105. TCH requests for HO (ho_14b) 76
Figure 106. TCH seizures for HO (ho_15) 76
Figure 107. TCH-TCH HO attempts (ho_16) 76
Figure 108. SDCCH-TCH HO attempts (ho_17) 77
Figure 109. SDCCH-SDCCH HO attempts (ho_18) 77
Figure 110. TCH-TCH HO successes (ho_19) 77
Figure 111. SDCCH-TCH HO successes (ho_20) 77
Figure 112. SDCCH-SDCCH HO successes (ho_21) 78
Figure 113. MSC controlled HO attempts (ho_22) 78
Figure 114. BSC controlled HO attempts (ho_23) 78
Figure 115. Intra-cell HO attempts (ho_24) 78
Figure 116. MSC controlled HO successes (ho_25) 79
Figure 117. BSC controlled HO successes (ho_26) 79
Figure 118. Intra-cell HO successes (ho_27) 79
Figure 119. MSC incoming HO successes (ho_28) 79



Figure 120. MSC outgoing HO successes (ho_29) 79
Figure 121. BSC incoming HO successes (ho_30) 80
Figure 122. BSC outgoing HO successes (ho_31) 80
Figure 123. Incoming HO success (ho_32) 80
Figure 124. Outgoing HO successes (ho_33) 80
Figure 125. Outgoing HO attempts (ho_34) 80
Figure 126. Incoming HO attempts (ho_35) 81
Figure 127. Outgoing SDCCH-SDCCH HO attempts (ho_36) 81
Figure 128. Incoming SDCCH-SDCCH HO attempts (ho_37) 81
Figure 129. Outgoing SDCCH-TCH HO attempts (ho_38) 81
Figure 130. Incoming SDCCH-TCH HO attempts (ho_39) 81
Figure 131. Outgoing TCH-TCH HO attempts (ho_40) 82
Figure 132. Incoming TCH-TCH HO attempts (ho_41) 82
Figure 133. Outgoing SDCCH-SDCCH HO success (ho_42) 82
Figure 134. Incoming SDCCH-SDCCH HO success (ho_43) 82
Figure 135. Outgoing SDCCH-TCH HO success (ho_44) 82
Figure 136. Incoming SDCCH-TCH HO success (ho_45) 83
Figure 137. Outgoing TCH-TCH HO success (ho_46) 83
Figure 138. Incoming TCH-TCH HO success (ho_47) 83
Figure 139. Total HO failure %, S1 (hfr_1) 84
Figure 140. Total HO failure %, S1 (hfr_2) 85
Figure 141. Intra-cell HO failure share, S1 (hfr_3a) 85
Figure 142. Intra-cell HO failure share, S1 (hfr_3b) 86
Figure 143. Intra-cell HO failure share, S1 (hfr_3c) 86
Figure 144. Intra-cell HO failure share, S1 (hfr_3d) 86
Figure 145. Incoming MSC ctrl HO failure %, S1 (hfr_4) 87
Figure 146. Incoming MSC ctrl HO failure share, S1 (hfr_4a) 87
Figure 147. Incoming MSC ctrl HO failure share, S1 (hfr_4b) 88
Figure 148. Incoming MSC ctrl HO failure share, S1 (hfr_4c) 88
Figure 149. Incoming MSC ctrl HO failure share, S1 (hfr_4d) 88
Figure 150. Outgoing MSC ctrl HO failure share %, S1 (hfr_5a) 89


Figure 151. Outgoing MSC ctrl HO failure share %, S1 (hfr_5b) 89
Figure 152. Outgoing MSC ctrl HO failure share %, S1 (hfr_5c) 90
Figure 153. Outgoing MSC ctrl HO failure share %, S1 (hfr_5d) 90
Figure 154. Incoming BSC ctrl HO failure %, S1 (hfr_6) 90
Figure 155. Incoming BSC ctrl HO failure share %, S1 (hfr_6a) 91
Figure 156. Incoming BSC ctrl HO failure %, S1 (hfr_6b 91
Figure 157. Incoming BSC ctrl HO failure share %, S1 (hfr_6c) 92
Figure 158. Incoming BSC ctrl HO failure %, S1 (hfr_6d) 92
Figure 159. Outgoing BSC ctrl HO failure share, S1 (hfr_7) 92
Figure 160. Outgoing BSC ctrl HO failure share, S1 (hfr_7a) 93
Figure 161. Outgoing BSC ctrl HO failure share, S1 (hfr_7b) 93
Figure 162. Outgoing BSC ctrl HO failure share, S1 (hfr_7c) 94
Figure 163. Outgoing BSC ctrl HO failure share, S1 (hfr_7d) 94
Figure 164. Internal inter HO failure %, S4 (hfr_8) 94
Figure 165. Internal intra HO failure %, S4 (hfr_9) 94
Figure 166. External source HO failure %, S4 (hfr_10) 95
Figure 167. HO failure % from super to regular, S4 (hfr_12) 95
Figure 168. HO failure % from regular to super, S4 (hfr_13) 95
Figure 169. Share of HO failures from regular to super due to return, S4 (hfr_14) 95
Figure 170. Share of HO failures from regular to super due to MS lost, S4 (hfr_15) 96
Figure 171. Share of HO failures from regular to super due to another cause, S4
(hfr_16) 96
Figure 172. Share of HO failures from super to regular due to return, S4 (hfr_17) 96
Figure 173. Share of HO failures from super to regular due to MS lost, S4 (hfr_18) 97
Figure 174. Share of HO failures from super to regular due to another cause, S4
(hfr_19) 97
Figure 175. SDCCH-SDCCH HO failure %, S2 (hfr_20) 97
Figure 176. SDCCH-TCH HO failure %, S2 (hfr_21) 98
Figure 177. TCH-TCH HO failure %, S2 (hfr_22) 98
Figure 178. SDCCH-SDCCH incoming HO failure %, S2 (hfr_23) 98
Figure 179. SDCCH-SDCCH outgoing HO failure ratio, S2 (hfr_24) 99
Figure 180. SDCCH-TCH incoming HO failure %, S2 (hfr_25) 99



Figure 181. SDCCH-TCH outgoing HO failure %, S2 (hfr_26) 99
Figure 182. TCH-TCH incoming HO failure %, S2 (hfr_27) 99
Figure 183. TCH-TCH outgoing HO failure %, S2 (hfr_28) 100
Figure 184. MSC ctrl HO failure %, blocking (hfr_29) 100
Figure 185. MSC ctrl HO failure %, not allowed (hfr_30) 100
Figure 186. MSC ctrl HO failure %, return to old (hfr_31) 100
Figure 187. MSC ctrl HO failure %, call clear (hfr_32) 101
Figure 188. MSC ctrl HO failure %, end HO (hfr_33) 101
Figure 189. MSC ctrl HO failure %, end HO BSS (hfr_34) 101
Figure 190. MSC ctrl HO failure %, wrong A interface (hfr_35) 101
Figure 191. MSC ctrl HO failure %, adjacent cell error (hfr_36) 102
Figure 192. BSC ctrl HO failure %, blocking (hfr_37) 102
Figure 193. BSC ctrl HO failure %, not allowed (hfr_38) 102
Figure 194. BSC ctrl HO failure %, return to old (hfr_39) 102
Figure 195. BSC ctrl HO failure %, call clear (hfr_40) 103
Figure 196. BSC ctrl HO failure %, end HO (hfr_41) 103
Figure 197. BSC ctrl HO failure %, end HO BSS (hfr_42) 103
Figure 198. BSC ctrl HO failure %, wrong A interface (hfr_43) 103
Figure 199. BSC ctrl HO drop call %, (hfr_44) 104
Figure 200. Intra-cell HO failure %, cell_fail_lack (hfr_45) 104
Figure 201. Intra-cell HO failure %, not allowed (hfr_46) 104
Figure 202. Intra-cell HO failure %, return to old (hfr_47) 104
Figure 203. Intra-cell HO failure %, call clear (hfr_48) 105
Figure 204. Intra-cell HO failure %, MS lost (hfr_49) 105
Figure 205. Intra-cell HO failure %, BSS problem (hfr_50) 105
Figure 206. Intra-cell HO failure %, drop call (hfr_51) 105
Figure 207. HO failure % to adjacent cell (hfr_52) 106
Figure 208. HO failure % from adjacent cell (hfr_53) 106
Figure 209. HO failure %, blocking excluded (hfr_54a) 106
Figure 210. HO failure % due to radio interface blocking (hfr_55) 107
Figure 211. Intra-cell HO failure %, wrong A interface (hfr_56) 107


Figure 212. Intra-cell HO failure % (hfr_57) 107
Figure 213. HO failures to target cell, S6 (hfr_58) 108
Figure 214. HO failures from target cell, S6 (hfr_59) 108
Figure 215. MSC controlled outgoing SDCCH-SDCCH HO success %, S1
(hsr_1) 108
Figure 216. MSC controlled outgoing SDCCH-TCH HO success %, S1 (hsr_2) 109
Figure 217. MSC controlled outgoing TCH-TCH HO success %, S1 (hsr_3) 109
Figure 218. BSC controlled outgoing SDCCH-SDCCH HO success %, S1
(hsr_4) 109
Figure 219. BSC controlled outgoing SDCCH-TCH HO success %, S1 (hsr_5) 109
Figure 220. BSC controlled outgoing TCH-TCH HO success %, S1 (hsr_6) 109
Figure 221. Intra-cell SDCCH-SDCCH HO success %, S1 (hsr_7) 110
Figure 222. Intra-cell SDCCH-TCH HO success %, S1 (hsr_8) 110
Figure 223. Intra-cell TCH-TCH HO success %, S1 (hsr_9) 110
Figure 224. MSC controlled incoming SDCCH-SDCCH HO success %, S1
(hsr_10) 110
Figure 225. MSC controlled incoming SDCCH-TCH HO success %, S1 (hsr_11) 110
Figure 226. MSC controlled incoming TCH-TCH HO success %, S1 (hsr_12) 111
Figure 227. BSC controlled incoming SDCCH-SDCCH HO success %, S1
(hsr_13) 111
Figure 228. BSC controlled incoming SDCCH-TCH HO success %, S1 (hsr_14) 111
Figure 229. BSC controlled incoming TCH-TCH HO success %, S1 (hsr_15) 111
Figure 230. BSC controlled incoming HO success %, S1 (hsr_16) 111
Figure 231. MSC controlled incoming HO success %, S1 (hsr_17) 112
Figure 232. Incoming HO success %, S1 (hsr_18) 112
Figure 233. Outgoing HO success %, S1 (hsr_19) 112
Figure 234. Intra-cell SDCCH-SDCCH HO success %, S1 (hsr_20) 112
Figure 235. Intra-cell SDCCH-TCH HO success %, S1 (hsr_21) 113
Figure 236. Intra-cell TCH-TCH HO success %, S1 (hsr_22) 113
Figure 237. Outgoing HO failures due to lack of resources (hof_1) 113
Figure 238. Incoming HO failures due to lack of resources (hof_2) 113
Figure 239. TCH HO failures when return to old channel was successful (hof_3) 114
Figure 240. SDCCH HO failures when return to old channel was successful



(hof_4) 114
Figure 241. MSC incoming HO failures (hof_5) 114
Figure 242. MSC outgoing HO failures (hof_6) 114
Figure 243. MSC outgoing HO failures (hof_6a) 115
Figure 244. BSC incoming HO failures (hof_7) 115
Figure 245. BSC incoming HO failures (hof_7a) 115
Figure 246. BSC outgoing HO failures (hof_8) 115
Figure 247. BSC outgoing HO failures (hof_8a) 115
Figure 248. Intra-cell HO failures (hof_9a) 116
Figure 249. Failed outgoing HO, return to old (hof_10) 116
Figure 250. Outgoing HO failures (hof_12) 116
Figure 251. Intra-cell HO failure, return to old channel (hof_13) 116
Figure 252. Intra-cell HO failure, drop call (hof_14) 116
Figure 253. Incoming HO failures (hof_15) 117
Figure 254. UL interference, BTS level, S1 (itf_1) 117
Figure 255. Idle TSL percentage of time in band X, TRX level, IUO, S4 (itf_2) 118
Figure 256. UL interference from IUO, TRX level, S4 (itf_3) 118
Figure 257. UL interference from Power Control, TRX level, S6 (itf_4) 118
Figure 258. TCH congestion time, S1 (cngt_1) 119
Figure 259. SDCCH congestion time, S1 (cngt_2) 119
Figure 260. FTCH time congestion % (cngt_3a) 119
Figure 261. FTCH time congestion % (cngt_3a) 119
Figure 262. HTCH time congestion % (cngt_4a) 120
Figure 263. HTCH time congestion % (cngt_4a) 120
Figure 264. Queued, served TCH call requests % (que_1) 120
Figure 265. Queued, served TCH HO requests % (que_2) 121
Figure 266. Queued, served TCH HO requests %, (que_2a) 121
Figure 267. Successful queued TCH requests (que_3) 121
Figure 268. Successful non-queued TCH requests (que_4) 121
Figure 269. Successful queued TCH HO requests (que_5) 122
Figure 270. Successful non-queued TCH HO requests (que_6) 122


Figure 271. Non-queued, served TCH call requests % (que_7) 122
Figure 272. Non-queued, served TCH HO requests % (que_8) 122
Figure 273. Non-queued, served TCH HO requests %, (que_8a) 123
Figure 274. TCH raw blocking, S1 (blck_1) 123
Figure 275. SDCCH blocking %, S1 (blck_5) 123
Figure 276. SDCCH real blocking %, S1 (blck_5a) 124
Figure 277. TCH raw blocking % on super TRXs, S4 (blck_6) 124
Figure 278. TCH raw blocking % on regular TRXs, S4 (blck_7) 124
Figure 279. TCH call blocking, before DR, S2 (blck_8) 125
Figure 280. TCH call blocking %, DR compensated, S2 (blck_8b) 126
Figure 281. TCH call blocking %, DR and DAC compensated, EFR excluded, S5
(blck_8d) 127
Figure 282. Blocked calls, S5 (blck_9b) 127
Figure 283. Blocked calls , S5 (blck_9c) 128
Figure 284. Blocked TCH HOs, S2 (blck_10a) 128
Figure 285. Blocked TCH HOs, S5 (blck_10b) 128
Figure 286. TCH HO blocking, S2 (blck_11a) 129
Figure 287. TCH HO blocking without Q, S2 (blck_11b) 129
Figure 288. TCH HO blocking, S5 (blck_11c) 129
Figure 289. Blocked incoming and internal HO, S2 (blck_12) 130
Figure 290. Blocked incoming and internal HO, S2 (blck_12a) 130
Figure 291. AG blocking, S1 (blck_13) 130
Figure 292. FCS blocking, S5 (blck_14) 130
Figure 293. Blocked SDCCH seizure attempts, S5 (blck_15) 131
Figure 294. HO blocking % (blck_16a) 131
Figure 295. Handover blocking %, (blck_16b) 131
Figure 296. Blocked FACCH call setup TCH requests, (blck_18) 132
Figure 297. Handover blocking to target cell, (blck_19) 132
Figure 298. Handover blocking from target cell, (blck_20) 132
Figure 299. NACK ratio of p-immediate assignment, S9PS (blck_21) 132
Figure 300. Territory upgrade rejection %, S9PS (blck_22) 133



Figure 301. TCH traffic sum, S1 (trf_1) 133
Figure 302. TCH traffic sum, S1 (trf_1a) 134
Figure 303. Average call length, S1 (trf_2d) 134
Figure 304. TCH usage, S1 (trf_3) 135
Figure 305. FTCH usage, S5 (trf_3b) 135
Figure 306. Average SDCCH holding time, S1 (trf_4) 135
Figure 307. Average FTCH holding time, S1 (trf_5) 136
Figure 308. TCH seizures for new call (call bids), S1 (trf_6) 136
Figure 309. SDCCH usage %, S1 (trf_7b) 136
Figure 310. TCH traffic absorption on super, S4 (trf_8) 137
Figure 311. TCH traffic absorption on super, S4 (trf_8a) 137
Figure 312. Average cell TCH traffic from IUO, S4 (trf_9) 137
Figure 313. Cell TCH traffic from IUO, S4 (trf_9a) 138
Figure 314. Super TRX TCH traffic, S4 (trf_10) 138
Figure 315. Sum of super TRX TCH traffic, S4 (trf_10a) 138
Figure 316. Average SDCCH traffic, erlang, S2 (trf_11) 138
Figure 317. Average SDCCH traffic, erlang, S2 (trf_11a) 139
Figure 318. Average TCH traffic, erlang, S2 (trf_12) 139
Figure 319. Average TCH traffic, erlang, S2 (trf_12a) 139
Figure 320. Average TCH traffic, erlang, S2 (trf_12b) 139
Figure 321. Handover/call %, (trf_13b) 140
Figure 322. Intra-cell handover/call %, (trf_13c) 140
Figure 323. Handover/call %, (trf_13d) 141
Figure 324. IUO, average TCH seizure length on super TRXs, S4 (trf_14b) 141
Figure 325. IUO, average TCH seizure length on regular TRXs, S4 (trf_15b) 141
Figure 326. Average TRX traffic, IUO, S4 (trf_16) 142
Figure 327. Average TRX TCH seizure length, IUO, S4 (trf_17a) 142
Figure 328. Average TRX TCH seizure length, IUO, S4 (trf_17b) 142
Figure 329. TCH requests for a new call, S3 (trf_18) 142
Figure 330. TCH requests for a new call, S3 (trf_18a) 143
Figure 331. Peak busy TCH (trf_19) 143


Figure 332. Average unit load (trf_20) 143
Figure 333. Call time difference between TRXs, S4 (trf_21) 144
Figure 334. Call time difference between TRXs, S4 (trf_21a) 144
Figure 335. Number of mobiles located in a cell, BSC, (trf_23a) 145
Figure 336. Total TCH seizure time (call time in seconds) (trf_24b) 145
Figure 337. Total TCH seizure time (call time in hours), (trf_24c) 145
Figure 338. SDCCH true seizures (trf_25) 146
Figure 339. SDCCH true seizures, S7 (trf_25a) 146
Figure 340. SDCCH true seizures for call and SS (trf_26) 146
Figure 341. SDCCH true seizures for call, SMS, SS (trf_27) 146
Figure 342. Peak busy SDCCH seizures (trf_28) 147
Figure 343. IUO layer usage % (trf_29) 147
Figure 344. SDCCH seizures (trf_30) 147
Figure 345. Call time (minutes) from p_nbsc_res_avail (trf_32) 147
Figure 346. Call time from p_nbsc_rx_qual (trf_32a) 148
Figure 347. Call time from p_nbsc_rx_statistics (trf_32b) 148
Figure 348. SDCCH HO seizure % out of HO seizure attempts (trf_33) 148
Figure 349. SDCCH assignment % out of HO seizure attempts (trf_34) 148
Figure 350. TCH HO seizure % out of TCH HO seizure request (trf_35) 149
Figure 351. TCH norm seizure % out of TCH call request (trf_36) 149
Figure 352. TCH normal seizure % out of TCH call requests, (trf_36a) 149
Figure 353. TCH FCS seizure % out of TCH FCS attempts (trf_37) 149
Figure 354. TCH FCS seizure % out of congested SDCCH seizure attempts
(trf_38) 150
Figure 355. TCH seizures for new calls (trf_39) 150
Figure 356. TCH seizures for new calls (trf_39a) 150
Figure 357. HTCH usage, S5 (trf_40) 151
Figure 358. MOC rate, S6 (trf_41) 151
Figure 359. MTC rate, S6 (trf_42) 151
Figure 360. TCH single band subscriber holding time, S6 (trf_43) 151
Figure 361. TCH dual band subscriber holding time, S6 (trf_44) 152



Figure 362. TCH data call seizures (trf_46) 152
Figure 363. Share of single band traffic (trf_47) 152
Figure 364. Share of dual band traffic (trf_48) 152
Figure 365. Call retries due to A interface pool mismatch (trf_49) 153
Figure 366. HO retries due to A interface pool mismatch (trf_50) 153
Figure 367. TCH single band subscribers’ share of holding time, S6 (trf_51) 153
Figure 368. TCH dual band subscribers’ share of holding time, S6 (trf_52) 154
Figure 369. Calls started as FACCH call setup (trf_53) 154
Figure 370. SDCCH seizures (trf_54) 154
Figure 371. TCH normal seizures (trf_55) 154
Figure 372. Total FTCH seizure time (trf_56) 154
Figure 373. Total HTCH seizure time (trf_57) 155
Figure 374. Average TCH hold time for HSCSD, S7 (trf_58) 155
Figure 375. Total HSCSD TCH seizure time (call time, hours),(trf_61) 155
Figure 376. Average upgrade pending time for HSCSD, (trf_62) 155
Figure 377. Average upgrade pending time due to congestion, (trf_63) 156
Figure 378. Total reporting time of ph1 and ph2 mobiles, (trf_64) 156
Figure 379. Total TCH seizures, (trf_65) 156
Figure 380. Net UL data traffic per timeslot, S9PS (trf_69a) 156
Figure 381. Net DL data traffic per timeslot, S9PS (trf_70a) 157
Figure 382. Average UL throughput per allocated timeslot, S9PS (trf_72b) 157
Figure 383. Average DL throughput per allocated timeslot, S9PS (trf_73b) 158
Figure 384. Total RLC data, S9PS (trf_74a) 158
Figure 385. GPRS territory UL utilisation, S9PS (trf_76b) 158
Figure 386. GPRS territory DL utilisation, S9PS (trf_77a) 159
Figure 387. UL GPRS timeslot usage, S9PS (trf_78a) 159
Figure 388. DL GPRS timeslot usage, S9PS (trf_79a) 160
Figure 389. SDCCH seizures for MO calls, S2 (moc_1) 160
Figure 390. Successful MO speech calls, S3 (moc_2) 161
Figure 391. Successful MO data calls, S3 (moc_3) 161
Figure 392. MO call success ratio, S6 (moc_4) 161


Figure 393. MO speech call attempts, S3 (moc_5) 162
Figure 394. MO call bids, S2 (moc_6) 162
Figure 395. SDCCH seizures for MT calls, S2 (mtc_1) 162
Figure 396. Successful MT speech calls (mtc_2) 162
Figure 397. Successful MT data calls, S3 (mtc_3) 163
Figure 398. MT call success ratio, S6 (mtc_4) 163
Figure 399. MT speech call attempts (mtc_5) 163
Figure 400. MT call attempts, S2 (mtc_6) 163
Figure 401. Number of paging messages sent, S2 (pgn_1) 164
Figure 402. Paging buffer size average, S1 (pgn_2) 164
Figure 403. Average paging buffer space, S1 (pgn_3) 165
Figure 404. Paging success ratio, S1 (pgn_4) 165
Figure 405. Average paging buffer Aif occpancy, S7 (pgn_5) 165
Figure 406. Average paging buffer Gb occpancy, S7PS (pgn_6) 165
Figure 407. Average DRX buffer occpancy due to paging, S7 (pgn_7) 166
Figure 408. Average DRX buffer occpancy due to DRX AG, S7 (pgn_8) 166
Figure 409. Average DRX buffer occpancy due to nonDRX AG, S7 (pgn_9) 166
Figure 410. SMS establishment failure % (sms_1) 166
Figure 411. SMS TCH establishment failure % (sms_2) 167
Figure 412. SMS SDCCH establishment failure % (sms_3) 167
Figure 413. SMS establishment attempts (sms_4) 167
Figure 414. SMS SDCCH establishment attempts (sms_5) 167
Figure 415. SMS TCH establishment attempts (sms_6) 168
Figure 416. DR, outgoing attempts, S3 (dr_1) 168
Figure 417. DR attempts, S3 (dr_1a) 168
Figure 418. DR, incoming attempts, S3 (dr_2) 168
Figure 419. DR, outgoing success to another cell, S3 (dr_3) 168
Figure 420. DR, incoming success from another cell, S3 (dr_4) 169
Figure 421. DR, intra-cell success, S3 (dr_5) 169
Figure 422. % of new calls successfully handed over to another cell by DR, S3
(dr_6) 169



Figure 423. DR, outgoing to another cell, failed, S3 (dr_7) 169
Figure 424. DR, intra-cell failed, S3 (dr_8) 170
Figure 425. TCH availability %, S4 (ava_1a) 170
Figure 426. TCH availability %, S9 (ava_1c) 170
Figure 427. TCH availability %, S9 (ava_1d) 171
Figure 428. Average available TCH, S1 (ava_2) 171
Figure 429. Average available SDCCH, S1 (ava_3) 171
Figure 430. SDCCH availability %, S4 (ava_4) 172
Figure 431. Average available FTCH in area, S1 (ava_5) 172
Figure 432. DMR availability %, S6 (ava_6) 172
Figure 433. DN2 availability %, S6 (ava_7) 172
Figure 434. TRU availability %, S6 (ava_8) 173
Figure 435. Average available TCH in BTS, S9 (ava_15) 173
Figure 436. Average available PDTCH in BTS, S9PS (ava_16) 173
Figure 437. Average available dedicated GPRS channels, S9PS (ava_17) 173
Figure 438. Average defined TCH, S1 (ava_18) 174
Figure 439. Average unavailable TSL per BTS, S1 (uav_1) 174
Figure 440. Average unavailable TSL per BTS, S1 (uav_1a) 174
Figure 441. Average unavailable TSL per BTS, S1 (uav_1b) 174
Figure 442. Total outage time, (uav_2) 175
Figure 443. Number of outages, (uav_3) 175
Figure 444. Share of unavailability due to user (uav_4) 175
Figure 445. Share of unavailability due to internal reasons (uav_5) 176
Figure 446. Share of unavailability due to external reasons (uav_6) 176
Figure 447. TRX unavailability time due to user (uav_7) 176
Figure 448. TRX unavailability time due to internal reasons (uav_8) 176
Figure 449. TRX unavailability time due to external reasons (uav_9) 177
Figure 450. Number of LU attempts, S1 (lu_1) 177
Figure 451. Average of LU attempts per hour, S1 (lu_2) 177
Figure 452. Number of LU attempts, S1 (lu_3) 177
Figure 453. LU success %, S6 (lsr_2) 178


Figure 454. Emergency calls, S6 (ec_1) 178
Figure 455. Emergency call success %, S6 (ecs_1) 178
Figure 456. Call re-establishment attempts, S6 (re_1) 179
Figure 457. Call re-establishments, S6 (re_2) 179
Figure 458. Call re-establishment success %, S6 (res_1) 179
Figure 459. DL BER, S1 (dlq_1) 180
Figure 460. DL cumulative quality % in class X, S1 (dlq_2) 180
Figure 461. DL cumulative quality % in class X, S1 (dlq_2a) 180
Figure 462. UL BER, S1 (ulq_1) 181
Figure 463. UL cumulative quality % in class X, S1 (ulq_2) 181
Figure 464. UL cumulative quality % in class X, S1 (ulq_2a) 181
Figure 465. Share % per range, S4 (dll_1) 182
Figure 466. Share % per range, S4 (ull_1) 182
Figure 467. Average MS power, S2 (pwr_1) 182
Figure 468. Average MS power, S2 (pwr_1b) 183
Figure 469. Average BS power, S2 (pwr_2) 183
Figure 470. Average DL signal strength, S2 (lev_1) 183
Figure 471. Average DL signal strength, S2 (lev_1a) 183
Figure 472. Average UL signal strength, S2 (lev_2) 184
Figure 473. Average UL signal strength, S2 (lev_2a) 184
Figure 474. Average MS-BS distance (dis_1) 184
Figure 475. Link balance, S1 (lb_1) 185
Figure 476. Share in acceptance range, S4 (lb_2) 185
Figure 477. Share in normal, S4 (lb_3) 185
Figure 478. Share in MS limited, S4 (lb_4) 185
Figure 479. Share in BS limited, S4 (lb_5) 186
Figure 480. Share in maximum power, S4 (lb_6) 186
Figure 481. Average MS power attenuation, S2 (lb_7) 186
Figure 482. Average MS power, S2 (lb_7b) 186
Figure 483. Average UL signal strength, S2 (lb_9) 187
Figure 484. Average DL signal strength, S2 (lb_10) 187



Figure 485. Average MS power attenuation, S2 (lb_11) 187
Figure 486. Average BS power attenuation, S2 (lb_12) 187
Figure 487. SDCCH access probability, before FCS (csf_1) 188
Figure 488. SDCCH access probability (csf_1a) 188
Figure 489. SDCCH success ratio (csf_2a) 189
Figure 490. SDCCH success ratio, (csf_2c) 189
Figure 491. SDCCH success ratio, BTS, S6 (csf_2g) 190
Figure 492. SDCCH success ratio, BTS, (csf_2i) 191
Figure 493. SDCCH success ratio, area, (csf_2j) 192
Figure 494. SDCCH success ratio, BTS, (csf_2k) 193
Figure 495. TCH access probability without DR (csf_3a) 193
Figure 496. TCH access probability without DR and Q (csf_3b) 194
Figure 497. TCH access probability without Q (csf_3c) 194
Figure 498. TCH access probability, real (csf_3d) 194
Figure 499. TCH access probability without DR, (csf_3i) 195
Figure 500. TCH access probability without DR and Q, (csf_3j) 195
Figure 501. TCH access probability, real, (csf_3k) 196
Figure 502. TCH access probability, real (csf_3l) 196
Figure 503. TCH access probability without DR and Q, (csf_3m) 197
Figure 504. TCH success ratio, area, before call re-establisment (csf_4o) 197
Figure 505. TCH success ratio, area, after call re-establishment, S6 (csf_4p) 198
Figure 506. TCH success ratio, BTS, before call re-establisment (csf_4q) 199
Figure 507. TCH success ratio, BTS, after call re-establishment (csf_4r) 199
Figure 508. TCH success ratio, BTS, after call re-establishment, (csf_4t) 200
Figure 509. TCH success ratio, area, before call re-establishment, S7(csf_4u) 200
Figure 510. TCH success ratio, area, after call re-establishment, S7 (csf_4v) 201
Figure 511. TCH success ratio, BTS, after call re-establishment, (csf_4x) 201
Figure 512. TCH success ratio, BTS, before call re-establishment, (csf_4y) 202
Figure 513. Reuse pattern (cnf_1) 202


Summary of changes

In this Functionality Note (FN T1712)

As a result of the changes made between BSS Network Doctor software versions
12.0 and 12.1 the following changes have been made into this document:

New formulas

• TBF (tbf)

- UL TBF reallocation failure ratio, S9PS (tbf_29)
- DL TBF reallocation failure ratio, S9PS (tbf_30)
- UL TBF reallocation attempts, S9PS (tbf_31)
- DL TBF reallocation attempts, S9PS (tbf_32)

• RLC (rlc)

- UL RLC blocks, S9PS (rlc_14)
- DL RLC blocks, S9PS (rlc_15)

• Frame Relay (frl), all formulas new

- Bytes in discarded sent frames, S9PS (frl_5)
- Bytes in discarded received frames, S9PS (frl_6)

• Random access (rach)

- Total RACH rejection ratio, S7 (rach_7)

• SDCCH drop ratio (sdr)

- SDCCH drop %, S3 (sdr_1a)
- Illegal establishment cause %, (sdr_3b)

• TCH drop call (dcr)

- TCH drop call %, after TCH assignment, w RE, area level, S7
(dcr_8b)

• Blocking (blck)

- NACK ratio of p-immediate assignment, S9PS (blck_21)
- Territory upgrade rejection %, S9PS (blck_22)

• Traffic (trf)

- GPRS territory UL utilisation, S9PS (trf_76b)
- UL GPRS timeslot usage, S9PS (trf_78a)
- DL GPRS timeslot usage, S9PS (trf_79a)

• Call success (csf)



- SDCCH success ratio, (csf_2c)

Removed formulas

• sdr_1 replaced with sdr_1a

• sdr_3 replaced with sdr_3b

• dcr_8a replaced with sdr_8b

• trf_76a replaced with trf_76b

• csf_2b replaced with csf_2c

In the previous Functionality Note (FN T1538)

As a result of the changes made between BSS Network Doctor software versions
11.2 and 12.0 the following changes have been made into this document:

New formulas

• Additional GPRS channels (ach), all formulas new

• Multislot (msl), all formulas new

• TBF (tbf), all formulas new

• RLC (rlc), all formulas new

• Availability (ava)

- ava_1c, TCH availability %, S9
- ava_1d, TCH availability %, S9
- ava_15, Average available TCH in BTS, S9
- ava_16, Average available PDTCH in BTS, S9PS
- ava_17, Average available dedicated GPRS channels, S9PS
- ava_18, Average defined TCH, S1

• Call success (csf)

- csf_2j, SDCCH success ratio, area, S9
- csf_2k, SDCCH success ratio, BTS, S9

• Congestion (cngt)

- cngt_3a, FTCH time congestion %
- cngt_4a, HTCH time congestion %

• Handover (ho)

- ho_13f, HO attempts, outgoing and intra-cell, S9


• Paging (pgn)

- pgn_5, Average paging buffer Aif occupancy, S7
- pgn_6, Average paging buffer Gb occupancy, S7PS
- pgn_7, Average DRX buffer occupancy due to paging, S7
- pgn_8, Average DRX buffer occupancy due to DRX AG, S7
- pgn_9, Average DRX buffer occupancy due to nonDRX AG, S7

• Traffic (trf)

- trf_61, Total HSCSD TCH seizure time (call time, hours)
- trf_62, Average upgrade pending time for HSCSD
- trf_63, Average upgrade pending time due to congestion
- trf_64, Total reporting time of ph1 and ph2 mobile
- trf_65, Total TCH seizures
- trf_69a, Net UL data traffic per timeslot, S9PS
- trf_70a, Net DL data traffic per timeslot, S9PS
- trf_72b, Average UL throughput per allocated timeslot, S9PS
- trf_73b, Average DL throughput per allocated timeslot, S9PS
- trf_74a, Total RLC data, S9PS
- trf_76a, GPRS territory UL utilisation, S9PS
- trf_77a, GPRS territory DL utilisation, S9PS

Removed formulas

• blck_8c replaced with blck_8d
• csf_2a replaced with csf_2b

• csf_2h replaced with csf_2j

• csf_4s replaced with csf_4v

• dcr_5a


About this manual

1 About this manual
This document defines the formulas used to calculating the Key Performance
Indicators based on the Nokia NMS/2000 database.

This document contains also formulas which are not used in any actual reports of
the NMS/2000 post-processing tools. You can see the formulas used in post-
processing from the actual reports of the tools.

Note
This document serves as a reference to the available formulas and does not
include information on whether the formula is in use or not.

The information contained in this document relates to BSS Network Doctor
software version 12.x, Nokia NMS release T12 and to release S9 of the Nokia
BSC software. This document should not be used with any other versions of the
Nokia NMS/2000 or Nokia BSC software.

This document is intended for the network operators of the Nokia NMS/2000.

This chapter covers the following topics:

• What you need to know first

• Where to find more

• Typographic conventions

• Concepts and terminology

1.1 What you need to know first
This document assumes that you are familiar with the following areas:



• The concepts of the Nokia NMS and GSM networks in general

• A text processing utility, such as vi or dtpad. These text processors are
used for editing certain configuration files.

1.2 Where to find more
When you perform the user’s tasks described in this document, you may need to
refer to other documentation for further information. Below is a list of manuals
that you will find useful, as well as a brief description of the manual’s contents.

BSS Network Doctor documentation

• BSS Network Doctor, Feature Overview, DN00308743, for a brief
overview on the application

• BSS Network Doctor, System Administrator’s Guide, DN98619369, for
system administrator’s tasks related to running Network Doctor
• BSS Network Doctor, User’s Guide, DN98614186, for a detailed
description on utilising the Network Doctor reports

Other Nokia documents

• Database Description for BSC Measurements, DN98619454, for a
description of the structure of performance management (PM) tables in the
NMS/2000 database and the records, including counters, in each table.

• Call Related DX Causes in BSC, Functional Description, DN9814277, for
an explanation of phases and for a list of causes in TCH and SDCCH
observations to find details for dropping calls.#1

• DX Cause Coding Mapping, DN9813878, for an explanation to the
relationship between DX cause codes and PM counters and for the analysis
of TCH and SDCCH observations.#2

1.3 Typographic conventions
The following tables present the typographic conventions which have been used
in this manual to describe different actions and restrictions.

1.3.1 Text styles

The following table presents the typefaces and fonts and their indications.


About this manual

Table 1. Text styles in this document

Style Explanation
Initial Upper-case Application names
Lettering

Italiced text Emphasis
State, status or mode

Courier File and directory names
Names of database tables
Parameters
User names
System output
User input

UPPER-CASE Keys on the keyboard (ALT, TAB, CTRL etc.)
LETTERING

Bold text User interface components

Initial Upper-case Referenced documents
Lettering in Italics Referenced sections and chapters within a document

<bracketed text> Variable user input

1.4 Terms and concepts
The lists below presents the terms and abbreviations used in this document.

1.4.1 Abbreviations

Table 2. Abbreviations

Abbreviation Explanation
AG Access Grant

BCCH Broadcast Control Channel

BCF Base Control Function

BER Bit Error Ratio

BSC Base Station Controller



Table 2. Abbreviations (Continued)

Abbreviation Explanation
BSS Base Station Subsystem

BTS Base Transceiver Station

CI Cell Identity

DL Downlink

DR Directed Retry

FCS Frame Check Sequence

HO Handover

IUO Intelligent Underlay Overlay

KPI Key Performance Indicator

LU Location Update

MML Man-machine Language

MOC Mobile Originated Call

MR Maintenance Region

MS Mobile Station

MSC Mobile Services Switching Centre

OMC Operation and Maintenance Centre

PI Performance Indicator

PLMN Public Land Mobile Network

PM Performance Management

RACH Random Access Control Channel

SDCCH Stand Alone Dedicated Control Channel

SMS Short Message Service

SQL Standard Query Language

SS Supplementary Service

TCH Trafﬁc Channel

TR Trunk Reservation

TRX Transceiver

TSL Timeslot

UL Uplink


About this manual

1.4.2 Terms

The lists below presents the abbreviations and terms used in this document.

Table 3. Terms used in this document

Term Explanation
AGCH A downlink control channel that is used to carry a
response to a mobile channel allocation request.
The AGCH assigns the mobile to operate on a
specific TDMA timeslot.

Bit Error Ratio The ratio of the number of the bit errors to the total
number of bits transmitted within a given time period.

Broadcast Control Channel (BCCH) A channel from a base station to a mobile station
(MS) used for transmission of messages to all
mobile stations located in the cell coverage area.

BTS group A predefined set of BTSs which can be created and
handled for definition by Network Doctor.

Cell Identity (CI) A number which identifies a cell to the networks
within a location area (LA).

Clear Code Code that describes why the call set-up or the call
itself has been disconnected.

Day The counting of data per day is based on the
period_start_time field in the measurement
tables. This field always tells the starting hour of the
measurement period. Under one day there are hours
from 00 to 23.

Directed Retry A procedure used in a call set-up phase for
assigning a mobile station to a traffic channel of a
cell other than the serving cell when the traffic is
congested.

Frame Check Sequence Extra characters added to a frame for the purposes
of error control. The FCS is used in HDCL, Frame
Relay, and other data link layer protocols.

Key Performance Indicator The performance of the network is calculated from
the NMS/2000 based on the Network Element
counter information. Sometimes the plain counter as
such describes an important performance aspect
(number of calls, for example) of the network but
sometimes a formula of counters is needed (e.g.
drop call ratio).



Table 3. Terms used in this document (Continued)

Term Explanation
Maintenance Region Each object in the NMS/2000 database belongs to
one and only one Maintenance Region (MR).

Mobile Terminated Call A call in which the called subscriber used a mobile
telephone.

NMS/2000 A product of Nokia Telecommunications for the
operation and maintenance of cellular networks.

SQL*Plus An interactive program for accessing the database.

Stand-alone Dedicated Control A control channel (CCH) used for roaming,
Channel (SDCCH) authentication, encryption activation and call control.

Timeslot (TSL) A timeslot in the time division multiple access
(TDMA) frame in the GSM radio interface.

Trafﬁc Channel A logical radio channel assigned to a base station
and primarily intended for conversation.

Trunk Reservation A stochastic algorithm employed in a channel
allocation from a cell.

For any other terms, refer to Glossary, DN9763965.


BSS counter formulas

2 BSS counter formulas
This chapter lists all BSS Network Doctor formulas. The more commonly used
ones are described in further detail concerning their use or known problems with
them, for example. In connection with the name of a formula there is also a
reference to the BSC release (S1 to S6) since when the counters of the formula
have been available.

The use of formulas backwards, S4 formulas with S3 for example, gives either no
results because the measurement is not available, or false results because some
counters, which are new in S4, will be filled with value -1 by the OMC for S3
BSCs.

Note
When running the reports with newer counters, be careful especially when you
have two BSC software releases running in the network simultaneously. The
simplest way to avoid problems is to start to use new counters of a new BSC
release only when the new software release is used in the entire network under the
NMS/2000.

2.1 Additional GPRS channels (ach)
Additional GPRS channel use, S9PS (ach_1)
Use: Example: if value equals to 1 then in average 1 additional
timeslot has been used for GPRS. If the situation continues it
indicates need for extending the default or dedicated territory.
total hold time of all additional GPRS ch. seizures (sec)
----------------------------------------------------------- =
period duration

sum(AVE_ADD_GPRS_CH_HOLD_TIME_SUM)/100
---------------------------------------
sum(period_duration*60)

Counters from table(s):
p_nbsc_res_avail



Unit: timeslot

Figure 1. Additional GPRS channel use, S9PS (ach_1)

Average additional GPRS channel hold time, S9PS (ach_2)
Use: If the value is high, more default area is needed.
total hold time of all additional GPRS ch. seizures (sec)
--------------------------------------------------------------- =
total nbr of all additional GPRS channel seizures

--------------------------------------------------------------------------
sum(decode(AVE_ADD_GPRS_CH_HOLD_TIME_SUM ,0,0,AVE_ADD_GPRS_CH_HOLD_TIME_DEN)

p_nbsc_res_avail
Unit: sec

Figure 2. Average additional GPRS channel hold time, S9PS (ach_2)

Additional GPRS channels seized, S9PS (ach_3)
Use: How many times an additional channel has been released
(territory downgrade).
sum(decode(AVE_ADD_GPRS_CH_HOLD_TIME_SUM,0,0,AVE_ADD_GPRS_CH_HOLD_TIME_DEN)

p_nbsc_res_avail

Figure 3. Additional GPRS channels seized, S9PS (ach_3)

Total additional GPRS channel hold time, S9PS (ach_4)
Use: If the value is high, more default area is needed.

p_nbsc_res_avail
Unit: sec

Figure 4. Total additional GPRS channel hold time, S9PS (ach_4)



2.2 Multislot (msl)
Distribution of UL multislot requests, S9PS (msl_1)
Use: Indicates the share of a multislot request type to all multislot
requests.
req_X_TSL_UL
100 * -------------------------------------------------------------------------- %
sum(req_1_TSL_UL+req_2_TSL_UL+req_1_TSL_UL +req_4_TSL_UL+ req_5_8_TSL_UL)

req_X_TSL_UL = one of the components of the denominator.

p_nbsc_packet_control_unit

Figure 5. Distribution of UL multislot requests, S9PS (msl_1)

Distribution of DL multislot requests, S9PS (msl_2)
requests.
req_X_TSL_DL
100 * -------------------------------------------------------------------------- %
sum(req_1_TSL_DL+req_2_TSL_DL+req_1_TSL_DL +req_4_TSL_DL+ req_5_8_TSL_DL)



Figure 6. Distribution of DL multislot requests, S9PS (msl_2)

Distribution of UL multislot allocations, S9PS (msl_3)
requests.
alloc_X_TSL_UL
100 * -------------------------------------------------------- %
sum(alloc_1_TSL_UL+alloc_2_TSL_UL+alloc_1_TSL_UL
+alloc_4_TSL_UL+ alloc_5_8_TSL_UL)



Figure 7. Distribution of UL multislot allocations, S9PS (msl_3)



Distribution of DL multislot allocations, S9PS (msl_4)
requests.
alloc_X_TSL_DL
100 * ------------------------------------------------------ %
sum(alloc_1_TSL_DL+alloc_2_TSL_DL+alloc_1_TSL_DL
+alloc_4_TSL_DL+ alloc_5_8_TSL_DL)

req_X_TSL_DL = one of the components of the denominator.


Figure 8. Distribution of DL multislot allocations, S9PS (msl_4)

UL multislot allocations, S9PS (msl_9)
Use: Total number of multislot allocations in UL.
sum(alloc_1_TSL_UL+alloc_2_TSL_UL+alloc_3_TSL_UL +alloc_4_TSL_UL+ alloc_5_8_TSL_UL)


Figure 9. UL multislot allocations, S9PS (msl_9)

DL multislot allocations, S9PS (msl_10)
Use: Total number of multislot allocations in DL.
sum(alloc_1_TSL_DL+alloc_2_TSL_DL+alloc_3_TSL_DL +alloc_4_TSL_DL+ alloc_5_8_TSL_DL)


Figure 10. DL multislot allocations, S9PS (msl_10)

Average number of allocated timeslots, UL S9PS (msl_11)
sum(alloc_1_TSL_UL+2*alloc_2_TSL_UL+3*alloc_3_TSL_UL +4*alloc_4_TSL_UL)
------------------------------------------------------------------------
sum(alloc_1_TSL_UL+alloc_2_TSL_UL+alloc_3_TSL_UL+alloc_4_TSL_UL)


Figure 11. Average number of allocated timeslots, UL S9PS (msl_11)



Average number of allocated timeslots, DL S9PS (msl_12)
sum(alloc_1_TSL_DL+2*alloc_2_TSL_DL+3*alloc_3_TSL_DL +4*alloc_4_TSL_DL)
------------------------------------------------------------------------
sum(alloc_1_TSL_DL+alloc_2_TSL_DL+alloc_3_TSL_DL+alloc_4_TSL_DL)


Figure 12. Average number of allocated timeslots, DL S9PS (msl_13)

Average number of requested UL timeslots, S9PS (msl_13)
sum(req_1_TSL_UL+2*req_2_TSL_UL+3*req_3_TSL_UL +4*req_4_TSL_UL)
------------------------------------------------------------------------
sum(req_1_TSL_UL+req_2_TSL_UL+req_3_TSL_UL+req_4_TSL_UL)


Figure 13. Average number of requested UL timeslots, S9PS (msl_13)

Average number of requested DL timeslots, S9PS (msl_14)
sum(req_1_TSL_DL+2*req_2_TSL_DL+3*req_3_TSL_DL +4*req_4_TSL_DL)
------------------------------------------------------------------------
sum(req_1_TSL_DL+req_2_TSL_DL+req_3_TSL_DL+req_4_TSL_DL)


Figure 14. Average number of requested DL timeslots, S9PS (msl_14)

UL multislot allocation %, S9PS (msl_15)
100* average allocated tsl / average requested tsl % =

sum(alloc_1_TSL_UL+2*alloc_2_TSL_UL+3*alloc_3_TSL_UL +4*alloc_4_TSL_UL)
------------------------------------------------------------------
sum(alloc_1_TSL_UL+alloc_2_TSL_UL+alloc_3_TSL_UL+alloc_4_TSL_UL)
100* ------------------------------------------------------------------------- %
sum(req_1_TSL_UL+2*req_2_TSL_UL+3*req_3_TSL_UL +4*req_4_TSL_UL)
----------------------------------------------------------------
sum(req_1_TSL_UL+req_2_TSL_UL+req_3_TSL_UL+req_4_TSL_UL)


Figure 15. UL multislot allocation %, S9PS (msl_15)



DL multislot allocation %, S9PS (msl_16)
100* average allocated tsl / average requested tsl % =

sum(alloc_1_TSL_DL+2*alloc_2_TSL_DL+3*alloc_3_TSL_DL +4*alloc_4_TSL_DL)
------------------------------------------------------------------
sum(alloc_1_TSL_DL+alloc_2_TSL_DL+alloc_3_TSL_DL+alloc_4_TSL_DL)
100* ------------------------------------------------------------------------- %
sum(req_1_TSL_DL+2*req_2_TSL_DL+3*req_3_TSL_DL +4*req_4_TSL_DL)
----------------------------------------------------------------
sum(req_1_TSL_DL+req_2_TSL_DL+req_3_TSL_DL+req_4_TSL_DL)


Figure 16. DL multislot allocation %, S9PS (msl_16)

UL multislot requests, S9PS (msl_17)
Use: Total number of multislot requests in UL.


Figure 17. UL multislot requests, S9PS (msl_17)

DL multislot requests, S9PS (msl_18)
Use: Total number of multislot requests in DL.


Figure 18. DL multislot requests, S9PS (msl_18)

2.3 TBF (tbf)
Average number of LLC blocks per UL TBF, S9PS (tbf_3)
Use: Indicates the average number of LLC data blocks per
normally released TBF.
sum(Ave_UL_LLC_per_TBF_sum)
----------------------------
sum(Ave_UL_LLC_per_TBF_den)




Figure 19. Average number of LLC blocks per UL TBF, S9PS (tbf_3)

Average number of LLC blocks per DL TBF, S9PS (tbf_4)
Use: Indicates the average number of LLC data blocks per
normally released TBF.
sum(Ave_DL_LLC_per_TBF_sum)
----------------------------
sum(Ave_DL_LLC_per_TBF_den)


Unit: seconds

Figure 20. Average number of LLC blocks per DL TBF, S9PS (tbf_4)

Average UL TBF duration, S9PS (tbf_5)
sum(ave_dur_ul_tbf_sum)
------------------------
sum(ave_dur_ul_tbf_den)


Unit: seconds

Figure 21. Average UL TBF duration, S9PS (tbf_5)

Average UL TBF duration, S9PS (tbf_5a)
Use: Counted from the normally released TBFs.
Known problems: Contains part of TBF establishment delays.
sum(ave_dur_ul_tbf_sum)/100
----------------------------
sum(ave_dur_ul_tbf_den)


Unit: seconds

Figure 22. Average UL TBF duration, S9PS (tbf_5a)

Average DL TBF duration, S9PS (tbf_6a)
Use: Counted from the normally released TBFs.



Known problems: Contains part of TBF establishment delays.
sum(ave_dur_dl_tbf_sum)/100
---------------------------
sum(ave_dur_dl_tbf_den)


Unit: seconds

Figure 23. Average DL TBF duration, S9PS (tbf_6a)

Average UL TBF duration, unack mode, S9PS (tbf_7)
um(ave_dur_ul_tbf_unack_mode_sum/100)
-------------------------------------
sum(ave_dur_ul_tbf_unack_mode_den)


Unit: seconds

Figure 24. Average UL TBF duration, unack mode, S9PS (tbf_7)

Average DL TBF duration, unack mode, S9PS (tbf_8)
sum(ave_dur_dl_tbf_unack_mode_sum/100)
--------------------------------------
sum(ave_dur_dl_tbf_unack_mode_den)


Unit: seconds

Figure 25. Average DL TBF duration, unack mode, S9PS (tbf_8)

UL mlslot allocation blocking, S9PS (tbf_15)
Known problems: Over 100 % values are met.
sum(NO_RADIO_RES_AVA_UL_TBF)
100 * ------------------------------------------------------------------------- %


Figure 26. UL mlslot allocation blocking, S9PS (tbf_15)



DL mlslot allocation blocking, S9PS (tbf_16)
Known problems: Values of over 100% are met.
sum(NO_RADIO_RES_AVA_DL_TBF)
100 * ------------------------------------------------------------------------- %


Figure 27. DL mlslot allocation blocking, S9PS

Normally released UL TBF ratio, S9PS (tbf_25)
Experiences on use: Cases when TBF is not released normally:
1) PCU receives a Channel Request, allocates resources and
sends assignment but receives no blocks. These cases can
occur if MS sends more than one Channel Request before it
receives an Immediate Assignment.
2) Ghost Accesses.
normally released UL TBFs
100*---------------------------- % =
established UL TBFs

sum(AVE_DUR_UL_TBF_DEN)
100*--------------------------- %
sum(NBR_OF_UL_TBF)


Figure 28. Normally released UL TBF ratio, S9PS (tbf_25)

Normally released DL TBF ratio, S9PS (tbf_26)
Use: DL TBF establishment is not completed normally, for
example, if a response from a MS is not received. If the TBF
is already running and the MS is not heard from, the counter
DL_TBF_REL_DUE_NO_RESP_MS is triggered.

normally released DL TBFs
100*---------------------------- % =
established DL TBFs

sum(AVE_DUR_DL_TBF_DEN)
100*---------------------------
sum(NBR_OF_DL_TBF)


Figure 29. Normally released DL TBF ratio, S9PS (tbf_26)



UL TBF reallocation failure ratio, S9PS (tbf_29)

sum(UL_TBF_REALLOC_FAILS)
100 * ----------------------------------------------- %
sum(UL_TBF_RE_ALLOCATIONS+ UL_TBF_REALLOC_FAILS)


Figure 30. UL TBF reallocation failure ratio, S9PS (tbf_29)

DL TBF reallocation failure ratio, S9PS (tbf_30)

sum(DL_TBF_REALLOC_FAILS)
100 * ----------------------------------------------- %
sum(DL_TBF_RE_ALLOCATIONS+ DL_TBF_REALLOC_FAILS)


Figure 31. DL TBF reallocation failure ratio, S9PS (tbf_30)

UL TBF reallocation attempts, S9PS (tbf_31)
sum(UL_TBF_RE_ALLOCATIONS+ UL_TBF_REALLOC_FAILS)


Figure 32. UL TBF reallocation attempts, S9PS (tbf_31)

DL TBF reallocation attempts, S9PS (tbf_32)
sum(DL_TBF_RE_ALLOCATIONS+ DL_TBF_REALLOC_FAILS)


Figure 33. DL TBF reallocation attempts, S9PS (tbf_32)

2.4 RLC (rlc)
Ack.CS1 RLC blocks UL, S9PS (rlc_1)
Use: Number of UL blocks in RLC ack mode using CS1.
Retransmission is not included.



sum(RLC_DATA_BLOCKS_UL_CS1 - RLC_DATA_BLOCKS_UL_UNACK)

Figure 34. Ack.CS1 RLC blocks UL, S9PS (rlc_1)

Ack.CS1 RLC blocks DL, S9PS (rlc_2)
Use: Number of DL blocks in RLC ack mode using CS1.
Retransmission is not included.
sum(RLC_DATA_BLOCKS_DL_CS1 - RLC_DATA_BLOCKS_DL_UNACK)

Figure 35. Ack.CS1 RLC blocks DL, S9PS (rlc_2)

Ack. CS1 RLC DL block error rate, S9PS (rlc_3a)
Use: Number of DL blocks in RLC ack mode using CS1.
sum(BAD_FRAME_IND_UL_CS1 - BAD_FRAME_IND_UL_UNACK )
100 * ------------------------------------------------ %
sum(RLC_DATA_BLOCKS_DL_CS1 - RLC_DATA_BLOCKS_DL_UNACK
+ BAD_FRAME_IND_UL_CS1 - BAD_FRAME_IND_UL_UNACK )

Figure 36. Ack. CS1 RLC DL Block error rate, S9PS (rlc_3a)

Unack. CS1 RLC UL block error rate, S9PS (rlc_4a)

sum(BAD_FRAME_IND_UL_UNACK)
100 * ---------------------------------------------------- %
sum(RLC_DATA_BLOCKS_UL_UNACK+ BAD_FRAME_IND_UL_UNACK)

Figure 37. Unack. CS1 RLC UL block error rate, S9PS (rlc_4a)

Ack. CS1 RLC UL block error rate, S9PS (rlc_5a)

sum(BAD_FRAME_IND_UL_CS2)
100 * ------------------------------------------------- %
sum(RLC_DATA_BLOCKS_UL_CS2+ BAD_FRAME_IND_UL_CS2)

Figure 38. Ack. CS1 RLC UL block error rate, S9PS (rlc_5a)

UL CS1 RLC data share, S9PS (rlc_6)

sum(RLC_data_blocks_UL_CS1*22
100 * ---------------------------------------------------------- %
(sum(RLC_data_blocks_UL_CS1*22+RLC_data_blocks_UL_CS2*32



+ RLC_data_blocks_DL_CS1*22+RLC_data_blocks_DL_CS2*32)


Unit: %

Figure 39. UL CS1 RLC data share, S9PS (rlc_6)

UL CS2 RLC data share, S9PS (rlc_7)

sum(RLC_data_blocks_UL_CS2*22
100 * ---------------------------------------------------------- %


Unit: %

Figure 40. UL CS2 RLC data share, S9PS

DL CS1 RLC data share, S9PS (rlc_8)

sum(RLC_data_blocks_DL_CS1*22
100 * ---------------------------------------------------------- %


Unit: %

Figure 41. DL CS1 RLC data share, S9PS (rlc_8)

DL CS2 RLC data share, S9PS (rlc_9)

sum(RLC_data_blocks_DL_CS2*22
100 * ---------------------------------------------------------- %


Unit: %

Figure 42. DL CS2 RLC data share, S9PS (rlc_9)



UL CS1 RLC block error rate, S9PS (rlc_10)
Known problems: 100% values met. 100% means that the MS has not responded
to USF. The number of ignored RLC data blocks in uplink due
to BSN in acknowledged mode should be subtracted, but there
is no counter specifically for CS1.
100 * ------------------------------------------------- %

Figure 43. UL CS1 RLC block error rate, S9PS (rlc_10)

UL CS2 RLC block error rate, S9PS (rlc_11)
Known problems: 100% means that there can be only failing accesses. The
number of ignored RLC data blocks in downlink due to BSN
in acknowledged mode should be subtracted, but there is no
counter specifically for CS1.
100 * ------------------------------------------------- %

Figure 44. UL CS2 RLC block error rate, S9PS (rlc_11)

DL CS1 RLC block error rate, S9PS (rlc_12)

sum(RETRA_RLC_DATA_BLOCKS_DL_CS1)
100 * ------------------------------------------------- %
sum(RLC_DATA_BLOCKS_DL_CS1+ RETRA_RLC_DATA_BLOCKS_DL_CS1)

Figure 45. DL CS1 RLC block error rate, S9PS (rlc_12)

DL CS2 RLC block error rate, S9PS (rlc_13)

sum(RETRA_RLC_DATA_BLOCKS_DL_CS2)
100 * -------------------------------------------------------- %
sum(RLC_DATA_BLOCKS_DL_CS2+ RETRA_RLC_DATA_BLOCKS_DL_CS2)

Figure 46. DL CS2 RLC block error rate, S9PS (rlc_13)

UL RLC blocks, S9PS (rlc_14)
Use: Total UL data volume as the number of RLC blocks.
sum(rlc_data_blocks_ul_cs1 + rlc_data_blocks_ul_cs2
+ rlc_mac_cntrl_blocks_ul + bad_frame_ind_ul_cs1



+ bad_frame_ind_ul_cs2 + bad_frame_ind_ul_unack
+ ignor_rlc_data_bl_ul_due_bsn)


Figure 47. UL RLC blocks, S9PS (rlc_14)

DL RLC blocks, S9PS (rlc_15)
Use: Total DL data volume as the number of RLC blocks.
sum(rlc_data_blocks_dl_cs1 + rlc_data_blocks_dl_cs2
+ rlc_mac_cntrl_blocks_dl + retra_rlc_data_blocks_dl_cs1
+ retra_rlc_data_blocks_dl_cs2)


Figure 48. DL RLC blocks, S9PS (rlc_15)

2.5 Frame relay (frl)
Bytes in discarded sent frames, S9PS (frl_5)
sum(dlci_1_bytes_sent+dlci_2_bytes_sent+dlci_3_bytes_sent+dlci_4_bytes_sent
+dlci_5_bytes_sent)

p_nbsc_frame_relay

Figure 49. Bytes in discarded sent frames, S9PS (frl_5)

Bytes in discarded received frames, S9PS (frl_6)
sum(DLCI_1_BYTES_REC+DLCI_2_BYTES_REC+DLCI_3_BYTES_REC+DLCI_4_BYTES_REC
+DLCI_5_BYTES_REC)

p_nbsc_frame_relay

Figure 50. Bytes in discarded received frames, S9PS (frl_6)



2.6 Random access (rach)
Average RACH slot, S1 (rach_1)
Use: Indicates the capacity of BTS for RACH burst handling.
Normally shows a constant value because it is dependent on
the BTS configuration which does not often change.
avg(ave_rach_slot/res_acc_denom1)

p_nbsc_res_access

Figure 51. Average RACH slot, S1 (rach_1)

Peak RACH load, average, S1 (rach_2)
Use: Indicates the absolute peak value during a measurement
period. Correlates strongly with UL interference.
Experiences on use: High values may suggest that MSs have problems in
accessing the BTS. High values do not mean high load on
SDCCH because SDCCH is needed only if the RACH passes
the detection in BTS.
Known problems: The peak value does not indicate yet how many times there
have been other peaks during the measurement period.
Open questions: How serious the high values really are from the MS point of
view?
avg(peak_rach_load)

p_nbsc_res_access

Figure 52. Peak RACH load, average, S1 (rach_2)

Peak RACH load %, S1 (rach_3)
Use: This PI indicates how near to full capacity the peak use of
RACH has been during the measurement period.
max(peak_rach_load)
100 * ------------------------------------- %
max(ave_rach_busy/res_acc_denom1)

p_nbsc_res_access

Figure 53. Peak RACH load %, S1 (rach_3)



Average RACH load % , S1 (rach_4)
Use: This PI indicates how high the RACH load is on average.
Experiences on use: If the value is to the order of tens of per cent, there probably
are access problems and MS users get, more often than usual,
3 beeps when trying to start calls. The probable reason is UL
interference.
avg(ave_rach_busy/res_acc_denom3)
100 * -------------------------------------- %
avg(ave_rach_slot/res_acc_denom1)

p_nbsc_res_access

Figure 54. Average RACH load %, S1 (rach_4)

Average RACH busy, S1 (rach_5)
Use: This PI indicates roughly the average of the used RACH slots.
If the average approaches the xb2 average RACH slotxb2
(rach_1) there probably are access problems and MS users
get, more often than usual, 3 beeps when trying to start calls.
avg(ave_rach_busy/res_acc_denom3)

p_nbsc_res_access

Figure 55. Average RACH busy, S1 (rach_5)

RACH rejected due to illegal establishment, S5 (rach_6)
Use: Most of the rejections are ghost accesses. Note that part of the
ghosts have legal establishment cause and get further to
SDCCH.
sum(ghost_ccch_res
- rej_seiz_att_due_dist)

p_nbsc_res_access

Figure 56. RACH rejected due to illegal establishment, S5 (rach_6)

Total RACH rejection ratio, S7 (rach_7)
Use: Ratio of all RACH rejections to total nbr of channel required
messages received.
Note that the counter ghost_ccch_res contains both ghosts and
rejections due to distance checking. The latter one is an
optional feature of BSC.


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