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
