CE Dimensioning for TEF01 Apr, 2011

CE DefinitionOne Channel Element is the base band resources required in the Node-B to provide capacity for one voice channel including control plane signaling, compressed mode, transmit diversity.

ZTE Channel Elements Features

Channel elements are pooled in one NodeB.CE for CCH are reserved.ZTEs BPC board can support 192CE for uplink and downlink respectively.This year BPK may be used instead of BPC. BPK has 384 instead of 192 by BPC. This is only for R99. For HSDPA special equipment is reserved.ZTEs baseband processing board has special chip to handle the traffic of HS-PDSCH and HS-SCCH. So HSDPA downlink traffic will not consume CE.HSUPA shares CE resource with R99 services

Summary of ZTE BPC process capability

Traffic TypeUser Number/throughputBPC12.2k 192MBMS3*4*256Kbps, 3*16*64KbpsHSPA users 144HSDPA/96HSUPACells supported6CellHSDPA43.2MbpsHSUPA15Mbps

CE Dimensioning ProcedureSubscribers per NodeB and traffic model will be the input of CE dimensioning. For CS service, CE number is calculated by using ErlangB model.Soft handover are considered.

CE Mapping of Different Bearer TypesR99 CE Factor TableHSUPA Factor TableReserved 43Mbps for HSDPA, HSDPA downlink traffic channel will not consume CE. Only associated signaling channel costs 0.3CE in downlink.

Different Bearer TypesCE FactorBPC(192CE)UplinkDownlinkR99AMR12.2K11CS64K2.51.8PS64K2.51.8PS128K53PS384K106

SFBearer RateUplink CE Factor6412~17.2kbps23218.6~37.2kbps3.31652.2~70.8 kbps4885.8~154.8 kbps4.81*4169.8~711 kbps5.72*4742.8~1448.4 kbps112*21455.6~2883 kbps282*2+2*42970~5742 kbps39

Dimensioning AssumptionTraffic Model Proposed by ZTESubscriber distributionPlease refer to planning proposal for traffic calculation details3G sites: 132

CitySmart phoneData CardTotalGuayaquil5744057492114936Per site57440/132=43557492/132=435870

Bearer TypesUnitTraffic Model per Subs @Busy HourPenetration RatioUplink Downlink AMR12.2KErlang0.030.0350%CS64KErlang0.0030.00350%PS64K/64Kkbps32322%PS64K/128Kkbps---PS64K/384Kkbps---HSDPA/HSUPAkbps4006002% 1%

Calculation Process-1Total traffic of AMR 12.2K per site = 870 * 0.03*50% = 13Erl According to Erlang-B model, simultaneous link number is 20.Total traffic of CS64Kusers per site = 870 * 0.03*50% = 1.3Erl According to Erlang-B model, simultaneous link number is 5.Total uplink throughput of PS64K users per site = 870 * 32 *2% = 557kbpsDownlink throughput of PS64K users per site = 870*32*2% = 557kbps

Calculation Process-2CE Consumed by HSUPAIf we assume that HSUPA throughput is 400kbps per user online. Then ZTEs base processing unit will consume 5.7*870*1% = 50CE.If it is 3.4K signalling for HSUPA downlink and uplink associated signalling channel.CE_DL signalling = 870*1%*0.3 = 3CE CE_UL signalling = 870*1%*0.3 = 3CE So total CE consumed by HSUPA will be 53CE@UL and 3CE@DL.CE Consumed by HSDPAFor HSDPA service, ZTE base band processing board has special chip to handle the traffic of HS-PDSCH and HS-SCCH. So traffic consumes no CE in downlink. If it is 3.4K signalling for HSDPA downlink associated signalling channel.CE_DL signalling = 870*2%*0.3 = 6CECE_DL signalling = 870*2%*0.3 = 6CE So total CE consumed by HSDPA will be 6CE@DL and 6CE@UL

Total Required CEIf consider 30% SHO RatioTotal Uplink CE = (20+12.5+21+53+6)*1.3=150 CETotal Uplink CE = (20+4.5+16+3+6)*1.3=52 CELimited by uplink, Total CE required is 150 CE.ZTEs BPC board can hardware support 192CE. So the base band processing resource can meet the requirement.

*******SHO-Soft handoverTotal UL CE-(20+12.5+21+53+6)*1.31.3-30% for SHO20-CS12.212.5-CS6421-PS6450+3=HSUPA+UL signaling6-HSDPA UL signaling

Total DL CE-(20+4.5+16+3+6)*1.31.3-30% for SHO20-CS12.24.5-CS6416-PS643-HSUPA DL signaling (HSUPA no DL traffic/CE consumption) 6-HSDPA DL signaling**