CDMA-工程师ppt课件

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75.0
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55.0
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Data Capacity
Test Environment
CDMA2000 1x Engineering
2003.6
Young Baek Global Network Biz
Global Biz
Contents
1. CDMA2000 1X Capacity
1.1 Voice Capacity 2.1 Data Capacity 3.1 Voice + Data Capacity
Reverse link cell loading vs # of call
number of call
Reverse Cell Loading(%)
19 23 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Voice Capacity
CDMA2000 1X Capacity
simultaneous active user is 43 call(cell loading 90%)
Parameter
Voice
Low rate data service
Data Rate(Kbps) 9.6
9.6
96.0%
Eb/No(dB)
5.1
5.1
94.0%
PG
128
128
92.0%
Ioc/Io
CDMA2000 1X Capacity
Near
OCNS
Edge
Data Capacity Multi Cell Test Result
CDMA2000 1X Capacity
Voice + Data Capacity
CDMA2000 1X Capacity
Voice + Data Capacity
Voice Capacity for Multi-FA
• If # of FA is more than 2, the capacity will be decreased due to interference from adjacent frequency.
• 2FA : 95% × 1FA Capacity • over 3FA : 93% × 1FA Capacity
2. Channel Element Engineering
2.1 Channel Card Configuration 2.2 Calculation of the required CE
3. FA Capacity Engineering
3.1 Data Traffic Modeling 3.2 Calculation of the required FA
CDMA2000 1X Capacity
Available Forward Power
• OH ch uses 28% out of total power. • As the voice traffic increases, forward power increase. But although
Voice Capacity
CDMA2000 1X Capacity
Capacity Gain of Voice Service
System
Simultaneous Active Traffic
# of User
(Erlang)
Theoritical Capacity Gain
IS-95A/B CDMA2000 1x
0.6
0.6
90.0%
Soft H/O gain
1.25
1.25
88.0%
Pilot Activity
0.16
0.16
86.0%
Data Activity
0.45
0.3
84.0%
Total Activity
0.61
0.46
82.0%
Nmax/sec/FA
43
57
80.0%
Nmax(Omni)
50
67
• Because the priority of voice is higher than that of data, data mobile is assigned the remaining forward power.
• Data users are sharing the remaining forward power by scheduler. • Thus, in order to calculate the allowable throughput in busy hour,
Gain
28/sec/FA 43/sec/FA 1.54 times
18.6 31.7 1.7 times
1. Reverse Pilot : 2dB 2. Improvement of close loop
Power control : 0.8dB
Total 2.8dB Gain(98%)
Data Capacity
4. Traffic Engineering Procedure
4.1 Traffic Engineering Procedure 4.2 Establish the design criteria 4.3 Estimate the amounts of traffic increase 4.4 Capacity increase planning
1. CDMA2000 1X Capacity
Voice Capacity
CDMA2000 1X Capacity
Voice Capacity for Single-FA
• Capacity of voice service is limited in the reverse link. • According to the multi-cell test results, the number of maximum
the # of voice call is 43call, forward power usage ratio is at best 57%. • Available power is assigned to data user
100.0
95.0 90.0 85.0
Forward power ratio(average) [%] OH ratio