Download - HSDPA Requirements
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Increasing HSDPA Throughput in the Increasing HSDPA Throughput in the NetworkNetwork
-Shaily Dodeja-Shaily Dodeja
--NPO EngineerNPO Engineer
For internal use only2 © Nokia Siemens Networks
Maximum Bit Rates
Coding rateCoding rate
QPSKQPSK
Coding rateCoding rate
1/41/4
2/42/4
3/43/4
5 codes5 codes 10 codes10 codes 15 codes15 codes
600 kbps600 kbps 1.2 Mbps1.2 Mbps 1.8 Mbps1.8 Mbps
1.2 Mbps1.2 Mbps 2.4 Mbps2.4 Mbps 3.6 Mbps3.6 Mbps
1.8 Mbps1.8 Mbps 3.6 Mbps3.6 Mbps 5.4 Mbps5.4 Mbps
16QAM16QAM
2/42/4
3/43/4
4/44/4
2.4 Mbps2.4 Mbps 4.8 Mbps4.8 Mbps 7.2 Mbps7.2 Mbps
3.6 Mbps3.6 Mbps 7.2 Mbps7.2 Mbps 10.7 Mbps10.7 Mbps
4.8 Mbps4.8 Mbps 9.6 Mbps9.6 Mbps 14.4 Mbps14.4 Mbps
HSDPA
Current Scenario
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Cell Throughput, In Active time
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HSDPA MCS Table
Current Best Scenario
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Average Reported CQI
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Code Distribution_RNDA1
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Code Distribution_RNDA2
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Code Distribution_RNDD1
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Capacity of E1 links
An E1 link is capable of supporting a maximum bit rate of 2.048 Mbps
• 32 channels each of 64 kbps
• 2 of these channels are used for signalling purposes
The effective available bit rate is 1.92 Mbps per E1 link
Example VCC allocations for a 2 x E1 Iub connection
VCC Cells per Second Equivalent Bit Rate
CNBAP 158 cps 67 kbps
DNBAP 315 cps 134 kbps
AAL2 SIG 158 cps 67 kbps
AAL2 UP 8198 cps 3476 kbps
AAL2 UP VCC must support common channels, dedicated channels and HSDPA
Iub overheads must be accounted for when evaluating the quantity of user plane traffic which can be supported
For internal use only10 © Nokia Siemens Networks
HSDPA RF vs Iub efficiency
60%
65%
70%
75%
80%
85%
90%
95%
100%
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
Iub capacity for 1+1+1 site [Mbps]
RF utilization [%]Iub utilization [%]
High Iub efficiency (95%) requires some overhead
(15%) in air interface
dimensioning
High RF efficiency (95%) requires some overhead
(25%) in Iub dimensioning
Iub dimensioning – Iub Efficiency
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- Coding rate is 3/4- Currently Most of the sites are using above configurations.
Current Configuration for 1.8/3.6 Mbps Throughput
For internal use only12 © Nokia Siemens Networks /
Proposed Configuration for 3.6/7.2/9.6 Mbps Throughput - 1(2)
Coding rateCoding rate
QPSKQPSK
Coding rateCoding rate
1/41/4
2/42/4
3/43/4
5 codes5 codes 10 codes10 codes 15 codes15 codes
600 kbps600 kbps 1.2 Mbps1.2 Mbps 1.8 Mbps1.8 Mbps
1.2 Mbps1.2 Mbps 2.4 Mbps2.4 Mbps 3.6 Mbps3.6 Mbps
1.8 Mbps1.8 Mbps 3.6 Mbps3.6 Mbps 5.4 Mbps5.4 Mbps
16QAM16QAM
2/42/4
3/43/4
4/44/4
2.4 Mbps2.4 Mbps 4.8 Mbps4.8 Mbps 7.2 Mbps7.2 Mbps
3.6 Mbps3.6 Mbps 7.2 Mbps7.2 Mbps 10.7 Mbps10.7 Mbps
4.8 Mbps4.8 Mbps 9.6 Mbps9.6 Mbps 14.4 Mbps14.4 Mbps
Proposed Scenario
For internal use only13 © Nokia Siemens Networks /
Proposed Configuration for 3.6/7.2/9.6 Mbps Throughput - 2(2)
Limitations:-
1. RF Conditions.2. Enough Power3. Real Time Traffic4. R99 Traffic5. IuPS Bandwidth6. SGSN to DCN Bandwidth
We have following limitations for getting the desired throughput:-
Requirements:-1.HSDPA Code Multiplexing2.HSDPA Proportional Fair Resource Packet Schedule3.Dedicated Carrier (Optional)4.HSDPA Layering License (If using Dedicated Carrier)5.HSUPA Activation (Optional but Recommended)
For internal use only14 © Nokia Siemens Networks /
Coding rateCoding rate
QPSKQPSK
Coding rateCoding rate
1/41/4
2/42/4
3/43/4
5 codes5 codes 10 codes10 codes 15 codes15 codes
600 kbps600 kbps 1.2 Mbps1.2 Mbps 1.8 Mbps1.8 Mbps
1.2 Mbps1.2 Mbps 2.4 Mbps2.4 Mbps 3.6 Mbps3.6 Mbps
1.8 Mbps1.8 Mbps 3.6 Mbps3.6 Mbps 5.4 Mbps5.4 Mbps
16QAM16QAM
2/42/4
3/43/4
4/44/4
2.4 Mbps2.4 Mbps 4.8 Mbps4.8 Mbps 7.2 Mbps7.2 Mbps
3.6 Mbps3.6 Mbps 7.2 Mbps7.2 Mbps 10.7 Mbps10.7 Mbps
4.8 Mbps4.8 Mbps 9.6 Mbps9.6 Mbps 14.4 Mbps14.4 Mbps
Proposed Scenario
Proposed Configuration for 5.4/10.7/14.4 Mbps Throughput - 1(2)
For internal use only15 © Nokia Siemens Networks / /
Proposed Configuration for 5.4/10.7/14.4 Mbps Throughput - 2(2)
Limitations:-
1. RF Conditions.2. Enough Power3. IuPS Bandwidth4. SGSN to DCN Bandwidth
We have following limitations for getting the desired throughput:-
Requirements:-1.HSDPA Code Multiplexing2.Shared HSDPA Scheduler for Baseband Efficiency (Optional)3.HSDPA Proportional Fair Resource Packet Schedule4.HSUPA Activation (Optional but Recommended)5.HSDPA Dynamic Resource Allocation 6.Dedicated Carrier (Mandatory)7.HSDPA Layering License (Mandatory)
For internal use only16 © Nokia Siemens Networks /
DCR PS
Huge improvement of the PS drop rate after the swap
Thanks