CE Dimensioning for TEF

01 Apr, 2011

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CE Definition

One 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.

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ZTE Channel Elements Features

Channel elements are pooled in one NodeB.

CE for CCH are reserved.

ZTE’s 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.

ZTE’s 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/throughputBPC

12.2k 192MBMS 3*4*256Kbps,

3*16*64KbpsHSPA users 144HSDPA/96HSUPACells supported 6CellHSDPA 43.2MbpsHSUPA 15Mbps

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CE Dimensioning Procedure

Subscribers 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.

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CE Mapping of Different Bearer Types

Different Bearer TypesCE Factor

BPC(192CE)

Uplink Downlink

R99

AMR12.2K 1 1

CS64K 2.5 1.8

PS64K 2.5 1.8

PS128K 5 3

PS384K 10 6

SF Bearer Rate Uplink CE Factor

64 12~17.2kbps 2

32 18.6~37.2kbps 3.3

16 52.2~70.8 kbps 4

885.8~154.8

kbps4.8

1*4 169.8~711 kbps 5.7

2*4742.8~1448.4

kbps11

2*21455.6~2883

kbps28

2*2+2*4

2970~5742 kbps

39

R99 CE Factor Table HSUPA Factor Table

Reserved 43Mbps for HSDPA, HSDPA downlink traffic channel will not consume CE. Only associated signaling channel costs 0.3CE in downlink.

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Dimensioning Assumption

Traffic Model Proposed by ZTE

City Smart phone Data Card Total

Guayaquil 57440 57492 114936

Per site 57440/132=435 57492/132=435 870

Subscriber distribution

Bearer Types Unit

Traffic Model per Subs @Busy Hour Penetration

RatioUplink Downlink

AMR12.2K Erlang 0.03 0.03 50%CS64K Erlang 0.003 0.003 50%

PS64K/64K kbps 32 32 2%PS64K/128K kbps - - -PS64K/384K kbps - - -

HSDPA/HSUPA kbps 400 600 2% 1%

Please refer to planning proposal for traffic calculation details

3G sites: 132

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Calculation Process-1

Total traffic of AMR 12.2K per site = 870 * 0.03*50% = 13Erl

According to Erlang-B model, simultaneous link number is 20.

CECEfactorLinkNumberCE AMRAMRUL 201202.122.12_ =×=×=

Total traffic of CS64Kusers per site = 870 * 0.03*50% = 1.3Erl

According to Erlang-B model, simultaneous link number is 5.

CECEfactorLinkNumberCE AMRAMRDL 201202.122.12_ =×=×=

CECEfactorLinkNumberCE KCSULKCSUL 5.125.2564_64_ =×=×=

CECEfactorLinkNumberCE KCSDLKCSDL 5.48.15.264_64_ =×=×=

Total uplink throughput of PS64K users per site = 870 * 32 *2% = 557kbps Downlink throughput of PS64K users per site = 870*32*2% = 557kbps

CECEfactorLinkNumberCE KPSULKPSUL 215.2]64/557[64_64_ =×=×=CECEfactorLinkNumberCE KPSDLKPSDL 168.1]64/557[64_64_ =×=×=

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Calculation Process-2CE Consumed by HSUPAIf we assume that HSUPA throughput is 400kbps per user online. Then ZTE’s 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@ULTotal 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.ZTE’s BPC board can hardware support 192CE. So the base band processing resource can meet the requirement.

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