CE Dimensioning for SPICE

18 Aug, 2009

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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 and softer handover.

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ZTE Channel Elements Features

Channel elements are pooled in one NodeB.

No additional CE resource is needed for CCH

The baseband processing board can process uplink and downlink resource separately. ZTE’s BPC board can support 192CE for uplink and downlink respectively.

The processing resource consumed by softer handover has been reserved, so softer handover doesn’t consume more CE.

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

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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. Base on the R99 CE mapping table and HSPA simulation result, the total CE per site can be calculated.

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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 RateUplink 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

CE Consumed by A-DCH0CE: SRB OVER HSPA0.3CE: SRB OVER R99 (3.4K low speed signaling)1CE: SRB OVER R99(13.6K high speed signaling)

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Dimensioning Assumption

Traffic Model Proposed by ZTE

Bearer Types Unit

Traffic Model per Subs @Busy Hour Penetration

RatioUplink Downlink

AMR12.2K Erlang 0.025 0.025 100%CS64K Erlang 0.0025 0.0025 100%

PS64K/64K kbps 0.1 0.1 30%PS64K/128K kbps 0.035 0.25 30%PS64K/384K kbps 0.015 0.15 30%

HSDPA/HSUPA kbps 0.5 1.2 10%

Phase Phase 1 Phase 2 Phase 3

Subscribers Forecast 15000 35000 50000

Site to be deployed 30 40 50

Sub. Per Site 500 875 1000

Users per Site in Phase 1 to 3

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Calculation Process 1-2 (Phase 3 as Example)

Total traffic of AMR 12.2K per site = 1000 * 0.025 = 25Erl

According to Erlang-B model, simultaneous link number is 34.

CECEfactorLinkNumberCE AMRAMRUL 341342.122.12_

Total traffic of CS64Kusers per site = 1000 * 0.0025 = 2.5Erl

According to Erlang-B model, simultaneous link number is 7.

CECEfactorLinkNumberCE AMRAMRDL 341342.122.12_

CECEfactorLinkNumberCE KCSULKCSUL 185.2764_64_

CECEfactorLinkNumberCE KCSDLKCSDL 138.1764_64_

Total uplink throughput of PS64K users per site = 1000 * (0.1+0.035+0.015) *30% = 45kbps Downlink throughput of PS64K users per site = 1000 *0.1 *30% = 30kbps

CECEfactorLinkNumberCE KPSULKPSUL 35.2]64/45[64_64_ CECEfactorLinkNumberCE KPSDLKPSDL 28.1]64/30[64_64_

Same with PS64K, PS128K consumes 3CE@DL, PS384K consumes 6CE@DL

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Calculation Process 2-2 (Phase 3 as Example)CE Consumed by HSUPAIf we assume that there are 4 HSUPA users per cell and throughput is 100kbps per user. Then ZTE’s base processing unit will consume 20(4.8*4) CE.For HSUPA uplink and downlink associated channel, one online user will consume 0.3 CE if SRB over R99 3.4k signalling. HSUPA associated channel for 4 online users require 2CE for uplink and downlink respectively. So total CE consumed by HSUPA will be 22@UL and 2@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 HSDPA downlink SRB is borne on R99 (3.4K signalling), 8 online users will consume 3 (=0.3*8) CE. So total CE consumed by HSDPA will be 3@DL.

Total Required CEIf consider 30% SHO RatioTotal Uplink CE = ((AMR)34+(VP)18+(PS64)3+22(HSUPA))*1.3=101 CETotal Downlink CE = ((AMR)34+(VP)13+(PS64)2+(PS128)3+(PS384)6+2(HSUPA A-DCH)+3(HSDPA A-DCH))*1.3=82 CELimited by uplink, Total CE required is 101 CE.ZTE’s BPC board can hardware support 192CE. So the base band processing resource can meet the requirement.

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CE Dimensioning Result for Phase 1 to 3

ZTE’s BPC board can hardware support 192CE. According to users number that SPICE provided and traffic model ZTE proposed, one BPC board can meet the requirement with the configuration of S111. With the further development of users and high speed data service, then the configuration of S222 and accordingly more CE will be required.

Services Phase 1 Phase 2 Phase 3

Uplink Downlink Uplink Downlink Uplink Downlink

R99

AMR12.2K 20 20 30 30 34 34CS64K 13 9 15 11 18 13PS64K 3 2 3 2 3 2

PS128K N/A 3 N/A 3 N/A 3PS384K N/A 6 N/A 6 N/A 6

HSPA

HSUPA Traffic 20 14 20 N/A 20 N/A

HSUPA A-DPCH 2 2 2 2 2 2

HSDPA A-DPCH

N/A 3 N/A 3 N/A 3

Total (*1.3 because of 30%

SHO Ratio)76 59 91 75 101 82

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