Gsm capacity

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  • (mc02h*440+(mc01-mc196-mc197+mc02b)*427+mc02b*383+(mc196+mc197-mc02b)*367+mc02a*286+mc8a*46)*8/(64*1024*3600)
  • 4.49 x TBF_uc + 4.18 x TBF_ua +7.88 x TBF_dc + 6.83 x TBF_da + 6.83 x RRR + 0.48 x LLC_u + 1.5x LLC_d + 5.75 x (PS_Paging + CS_Paging) < 600
  • P402a TIME_PMU_OVERLOAD_CRITICAL P402b TIME_PMU_OVERLOAD_SEVERE P402c TIME_PMU_OVERLOAD_HIGH P76a AV_PMU_CPU_POWER_BUDGET P77a MAX_PMU_CPU_POWER_BUDGET
  • Gsm capacity

    1. 1. Network Capacity monitor – Paging Capacity• Paging Capacity – Number_Paging_Per_LAC = 【( 9or3 -BS_AG_BLKRES ) × ( 3600/0.235 )】 ×Number_Paging/PCH_BLK ( 4 ) × ( 0.6 ) (reserve 60% redundancy) – Warning Value : 140000/hr ; Alarm Value : 160000/hr – For Alcatel network, when the paging times raise to 220000/hr, it will make CSSR worse – Optimization Method : • Check the MSC parameter and database, delete the redundancy data; • Reduce BS_AG_RESBLK, give more CCCH block for paging channel; • Adjust MSC parameter: paging retry times, to reduce the paging retry times; • Temporarily Reduce the high traffic cells’ TX-power, or increase the access threshold of high traffic cells; • Restrict the number of SMS, the SMS center can consider about temporarily close the advertisement SMS; • Split high load Location Area, Re-home BTS distribution
    2. 2. Paging Capacity Evaluation sample Peak paging Warning AlarmMS C BS C LAC 30% redundancy 50% redundancy 80% redundancy times Value Value cc1_1_104 17156 146858 190915 220287 264345 cc1_2_105 cc1_3_106 17155 122700 159510 184050 220860G1 cc1_4_107 cc1_5_120 17170 127868 166228 191801 230162 cc1_7_129 cc1_6_114 17178 141115 183450 211673 254007 cc2_5_218 17158 65476 85119 98214 117857 cc2_4_217 17172 54316 70611 81474 97769 cc2_1_203G2 17173 81785 106321 122678 147213 cc2_8_226 cc2_2_215 17180 94330 122629 141495 169794 cc2_6_219 cc3_1_308 17330 70534 91694 105801 126961 140000 160000 cc3_2_309 17329 95558 124225 143337 172004 cc3_3_313G3 cc3_4_202 cc3_5_201 17153 155335 201936 233003 279603 cc3_6_321 cc4_1_410 cc4_2_411 17313 155542 202205 233314 279976 cc4_3_412G4 cc4_4_423 17154 113178 147131 169766 203720 cc4_5_424 cc4_6_425 17176 52622 68408 78933 94719 cc5_6_216D5 17175 121692 158200 182538 219046 cc5_7_222
    3. 3. Network Capacity – A-interface and No.7 link• A-interface capacity – Control Erl/Ts of A-interface under the safe threshold. (0.85Erl/Ts) – A-interface need expansion for each BSC = Target Traffic(30% redundancy) / safe Erl/Ts of A-interface(0.85Erl/Ts) - current No of A-interface• No.7 signal link capacity – No.7 signaling load = ( MOC * 440 + MOT * 427 + SMS(MO) * 383 + SMS(MT) * 367 + LU * 286 + Paging * 46 ) *8 / ( 64*1024*3600 ) (calculate on BSS part) – Current No.7 signaling load can be statistic by NSS (directly check on NSS part) – Suggest control the No.7 signaling load under 0.4
    4. 4. A-interface Capacity Sample Current No Traffic(3 No A- Can be of A- Current 0% Erl_TS (30% A-interfaceBS C Config G-Ater Erl_TS interface expanded interface Peak Traffic redunda redundancy) need expand TS ncy)cc1_1_104 config6 52 2 12 1474 1123 0.76 1460 0.99 9cc1_2_105 config6 52 3 8 1475 1127 0.76 1465 0.99 9cc1_3_106 config6 56 3 4 1593 1316 0.83 1710 1.07 15cc1_4_107 config6 49 2 15 1383 1153 0.83 1499 1.08 14cc1_5_120 config6 52 3 8 1493 1131 0.76 1470 0.98 9cc1_6_114 config6 48 2 16 1375 1306 0.95 1698 1.24 23cc1_7_129 config6 48 2 16 1379 925 0.67 1202 0.87cc2_1_203 config6 52 2 12 1454 1138 0.78 1480 1.02 11cc2_2_215 config6 49 2 15 1384 1069 0.77 1389 1.00 9cc2_4_217 config6 51 2 13 1463 1214 0.83 1578 1.08 15cc2_5_218 config6 44 2 20 1263 1111 0.88 1445 1.14 16cc2_6_219 config6 52 2 12 1493 1173 0.79 1525 1.02 11cc2_8_226 config6 44 2 20 1264 979 0.77 1273 1.01 9cc3_1_308 config6 63 2 1 1788 1246 0.70 1620 0.91 5cc3_2_309 config6 40 2 24 1127 608 0.54 790 0.70cc3_3_313 config6 60 3 0 1702 1166 0.68 1515 0.89 3cc3_4_202 config6 44 2 20 1255 1135 0.90 1476 1.18 18cc3_5_201 config6 45 2 19 1288 1268 0.98 1648 1.28 24cc3_6_321 config6 28 2 36 798 570 0.71 741 0.93 3cc4_1_410 config6 44 2 20 1250 840 0.67 1092 0.87cc4_2_411 config6 50 2 14 1423 1033 0.73 1343 0.94 6cc4_3_412 config6 44 1 21 1254 940 0.75 1222 0.97 7cc4_4_423 config6 58 2 6 1667 1303 0.78 1694 1.02 12
    5. 5. No.7 signalling link capacity sampleBS C Name ST ET MOC MTC S MS (MO) S MS (MT) Loc Update PagingNJ-G2-BSC1 22:00 23:00 28435 73034 68645 63803 41620 88393NJ-G2-BSC10 17:00 18:00 21325 53811 25717 33230 152842 59863NJ-G2-BSC11 21:00 22:00 18186 41732 33711 34142 51533 109083NJ-G2-BSC12 22:00 23:00 19953 63864 59848 57252 33468 98731NJ-G2-BSC13 21:00 22:00 12503 29955 22906 23938 41242 98725NJ-G2-BSC14 21:00 22:00 13500 31916 25818 25476 44199 88522NJ-G2-BSC15 17:00 18:00 21986 50630 25856 30766 106047 88539NJ-G2-BSC16 17:00 18:00 18907 53173 28784 35372 90480 116672NJ-G2-BSC17 17:00 18:00 18194 53091 28491 34970 65551 116679NJ-G2-BSC18 22:00 23:00 26295 79998 76169 71285 48690 144824NJ-G2-BSC19 17:00 18:00 18083 47562 24026 30123 64703 117215NJ-G2-BSC2 22:00 23:00 27824 93660 93719 86062 39281 104183 Current Total load Average S ugget Add Average Load afterBS C Name No.7 of No.7 Load of No.7 No of No.7 AdjustmentNJ-G2-BSC1 12 3.81 0.32NJ-G2-BSC10 14 3.51 0.25NJ-G2-BSC11 9 2.48 0.28 N7 signalingNJ-G2-BSC12 8 3.28 0.41 9 0.36NJ-G2-BSC13 8 1.83 0.23 load controlNJ-G2-BSC14 11 1.94 0.18 under 0.4NJ-G2-BSC15 12 3.03 0.25NJ-G2-BSC16 12 3.01 0.25NJ-G2-BSC17 12 2.75 0.23NJ-G2-BSC18 12 4.25 0.35NJ-G2-BSC19 12 2.53 0.21NJ-G2-BSC2 8 4.73 0.59 12 0.39
    6. 6. Network Capacity – GPRS Capacity• RA Code and RA Color configuration is suitable or not• Ater-interface configuration – The Ater interface configuration principle is: each Ater config 112 GPRS TS. Should consider about P150g to analyze the load.• PPC Capacity – PPC capacity can be calculated by this formula: • (4.71*p30c+4.18*p30b+7.88*(p90a+p90c)+6.83*2*p90b+0.48*P74+1.5* P75+5.75* P53a)/3600, The result should be smaller than: 65%*650 – For BSC with many GPRS user, open MPDCH function. – For multi-layer network or neighbor BSC, suggest to connect their GPU to different module of SGSN.• GPU configuration requirement • If Cell No of BSC < 50, need 1 GPU; • If 50< Cell No of BSC < 100, need 2 GPU; • If Cell No of BSC > 100, need 3 GPU.• After LAC adjustment, should keep OMCR data consistent with MFS data
    7. 7. GPRS Capacity Sample MAX_NB_ESTABLIS PDCH TIME_ATERM Time_DSP Ater BSC Cell No GPU HED_PDCH_GPU(P1 occupation per UX_CONG(P3 _Cong(P38 Note Config 50g) Ater 83a) 4)cc1_1_104 52 2 202 2 90% 0 0cc1_2_105 61 2 291 3 87% 0 0cc1_3_106 58 2 244 3 73% 0 0cc1_4_107 58 2 214 2 96% 455 0cc1_5_120 51 2 147 3 44% 0 0cc1_6_114 41 2 139 2 62% 0 0cc1_7_129 39 2 135 2 60% 0 0cc2_1_203 87 1 106 2 47% 0 0cc2_2_215 80 1 104 2 46% 0 0cc2_4_217 87 1 109 2 49% 0 0cc2_5_218 117 1 103 2 46% 0 0cc2_6_219 108 1 110 2 49% 0 0cc2_8_226 75 1 89 2 40% 0 0cc3_1_308 71 2 224 2 100% 26620 0cc3_2_309 46 2 179 2 80% 0 0cc3_3_313 81 2 282 3 84% 1215 0cc3_4_202 51 2 202 2 90% 285 0cc3_5_201 51 2 192 2 86% 0 0cc3_6_321 36 2 146 2 65% 0 0cc4_1_410 51 2 213 2 95% 505 0cc4_2_411 47 2 205 2 92% 2685 0cc4_3_412 49 2 206 2 92% 10 0cc4_4_423 57 2 221 2 99% 3190 0 One Ater faultcc4_5_424 51 2 112 2 50% 7130 0cc4_6_425 40 2 176 2 79% 0 0cc5_6_216 64 1 182 2 81% 0 0 One Ater faultcc5_7_222 78 1 185 2 83% 0 0
    8. 8. GPRS Gb interface of Huawei Gb Interface Suggestion  Gb interface number=A*8/(64*1024)/5 /70% ( higher integer )Note : A : NS Performance―――>Received NS PDU Peak value ( 5s ); 70% is the percentage of Gb interface value divide by all transmission value

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