GSM Abis Dimensioning(2010324)

GSM Abis Dimensioning

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Traditional Transmission——Abis of TDM over E1 Abis E1 Dimension Principle for FullRate:

15 FR TRX per E1

S555 configuration: 1 BCCH per cell; 3 SDCCHs per cell; TCH channel = 5*8-1-3=36 Signaling : 1 RSL / TRX, 1 OML / Site, RSL or OML occupy one 16kbps timeslot Total 16kbps channel required= 36*3+15+1=124= 124/4=31 64kpbs timeslot= 1 E1

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Traditional Transmission——Abis of TDM over E1 Abis E1 Dimension Principle for HalfRate:

About 13 100％HR TRX per E1

About (15-2*HR Ratio) TRX per E1

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Transmission Optimization——Abis of IP over E1 Dimensioning Procedure:

Abis Interface Throughput

Control Plane Throughput

User Plane Throughput

T _Control Plane

T _User Plane

Abis throughput factors: Ø Signalling Overhead in control plane Øgeneral consider signaling throughput is equal to 10% CS user throughput

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Transmission Optimization——Abis of IP over E1 Abis Interface Protocol Stack (IP over E1) Control Plane

Protocol Overhead in user plane-CS part

User Plane

RSL/OML

PPP

LAPD

UDP

UDP IP

Payload (bits) Payload ( MAC Layer)

264

Internal defined header

32

IP_UDP header

224

PPP header

56

Voice frame len / 20ms (bit)

576

IP MAC L1（PHY）

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Transmission Optimization——Abis of IP over E1 Dimensioning Procedure - User Plane

INPUT

• VAD Factor = 0.5 • MAC Packet Size = 264 bits • Packet time = 20ms

Voice frame len / 20ms (bit) =Payload ( MAC Layer) + internal defined header + IP_UDP header + PPP header =576 bits

Voice frame bit rate / UM channel（kbps）W/O Mux=voice frame len / 20ms (bit) * 50 * VAD / 1024 =14.1kpbs

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Transmission Optimization——Abis of IP over E1 Dimensioning Procedure - User Plane

Maximum MUX number = 8

Mux Total Size (bit) with MUX =8*(Payload ( MAC Layer)+56) + internal defined header + IP_UDP header + PPP header =2872

Avg frame bit rate (kbps) with MUX =Mux total size*50*VAD factor/1024/Mux number =8.8kbps

End of CS User Plane

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speech version (Code Scheme)

Payload in RLC/MAC layer (bit）

Avg frame bit rate(kbps)

FR

264

8.8

EFR

248

8.4

AMR-FR12.2

264

8.8

HR

120

5.2

AMR-HR7.95

176

6.6

CS-1

160

6.4

CS-2

240

8.4

CS-3

288

9.5

CS-4

400

12.3

MCS-1

176

6.8

MCS-2

224

8.0

MCS-3

296

9.7

MCS-4

352

11.1

MCS-5

448

13.5

MCS-6

592

17.0

MCS-7

896

24.4

MCS-8

1088

29.1

MCS-9

1184

31.4

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Example - Abis of IP over E1 Dimensioning Procedure Case study: supposed S444; 10% LCLS; 100% FR; 3 Activated MCS9 PDCHs; 85%Transmission Link Bandwidth Utilization

CS channel bandwidth (Kbps) =(1-LCLS percentage)*Avg frame bit rate (kbps) with MUX for CS* Total voice number/BH =(1-10%)*8.8*84=665.28 kbps

PS channel bandwidth (Kbps) =Number of Activated PDCHs in Busy Hours*Avg frame bit rate (kbps) with MUX for PS =3*31.4=97.2kbps

Signaling bandwidth (Kbps) =10% *CS channel bandwidth (Kbps) =10%*665.28=66.53kbps

Total Abis requirement (Kbps) =(CS channel bandwidth (Kbps)+ PS channel bandwidth (Kbps)+ Signaling bandwidth (Kbps))/Transmission Link Bandwidth Utilization =(665.28+97.2+66.53)/85%=975.31kbps

Total Abis timeslot requirement (64Kbps) =Roundup (Total Abis requirement (Kbps)/ 64kbps,0)+1 =Roundup(975.31/64,0)+1=17

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Abis Dimensioning for S111 Configuration Assumption1: (1) S111; (2) 10% LCLS; (3) 20% HR; (4) 2 Activated MCS9 PDCHs; (5) 85%Transmission Link Bandwidth Utilization Transmission Method

Abis Bandwidth (Kbps)

Abis IP over FE/GE

379.62

Abis IP over E1/T1

326.32

Assumption2: (1) S111; (2) 10% LCLS; (3) 20% HR; (4) 2 Activated DAS-12 PDCHs (EDGE+); (5) 85%Transmission Link Bandwidth Utilization Transmission Method

Abis Bandwidth (Kbps)

Abis IP over FE/GE

494.47

Abis IP over E1/T1

402.89

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