For internal use only1 © Nokia Siemens Networks /

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

For internal use only3 © Nokia Siemens Networks

Cell Throughput, In Active time

For internal use only4 © Nokia Siemens Networks /

HSDPA MCS Table

Current Best Scenario

For internal use only5 © Nokia Siemens Networks

Average Reported CQI

For internal use only6 © Nokia Siemens Networks /

Code Distribution_RNDA1

For internal use only7 © Nokia Siemens Networks /

Code Distribution_RNDA2

For internal use only8 © Nokia Siemens Networks /

Code Distribution_RNDD1

For internal use only9 © Nokia Siemens Networks

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

For internal use only11 © Nokia Siemens Networks /

- 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