hsupa 2mstti

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

HUAWEI TECHNOLOGIES CO., LTD.

Kuwait Zain 3G MS Project HSUPA Data Rates

December 05 , 2011


HSUPA Evolution Roadmap

This feature is the enhancement of the

HSUPA Phase 1. The main

enhancement includes:

1- Peak rate: 5.76 Mbit/s per user (5.74

Mbit/s (MAC) per user)

2- 2 ms / 10 ms TTI

3- Max users per cell : 60

4- UL compress mode (10 ms and 2

ms)

5- Enhanced fast UL scheduling

6- SRB over HSUPA.

7- E-AGCH Power Control (Based on

CQI or HS-SCCH)


UL R99. The main enhancement

includes:

1- HSUPA UE Category 1 to 7

2- HSUPA HARQ and Fast UL

Scheduling in Node B

3- HSUPA DCCC

4- Interactive and Background Traffic

Class on HSUPA

5- HSUPA 1.44Mbps per User

6- 20 HSUPA Users per Cell

RAN10.0

RAN6.1


HSUPA Phase 2. The main

enhancement includes:

1- HSUPA EFD

2- UL 16QAM

3- UL L2 Improvement

RAN12.0

HSUPA

Phase 1

HSUPA

Phase 2

HSPA+

Phase 2

1.44 Mbps

11.5 Mbps

5.74 Mbps

Zain UMTS Network

is almost here!


HSUPA Theoretical Background

• HSUPA TTI definition

The TTI for a service over HSUPA can be 2 ms or 10 ms. When the TTI is 2 ms, higher

throughput can be achieved. When the TTI is 10 ms, wider coverage can be achieved. The

HSUPA TTI selection feature can dynamically change the TTI from 2 ms to 10 ms on the edge for

wider coverage or from 10 ms to 2 ms for higher throughput. In this way, call drops are reduced

and the quality of service (QoS) is ensured.

•peak data rate (E-DCH Category 6)

For a 10ms TTI UE:

For a 2ms TTI UE,

sMbitsMbitSF

McpstePeakDataRa /2/92.14

)4(284.3

sMbitSFSF

McpstePeakDataRa /76.5)2

)2(2

4

)4(2(84.3

10 ms TTI 2 ms TTI

Category 3 2 x SF4 10 ms only 1.45 – 1.92

Category 6 2 x SF4 + 2 x SF2 10 ms and 2 ms 2 5.74 5.76

E-DCH

Category

Max. Capability

CombinationE-DCH TTI

Max. Data Rate (Mbit/s)

Air InterfaceMAC Layer


HSUPA CE Consumption table

SF Number of CE consumed Max. Data Rate (Mbit/s) E-DCH Category

SF32 1 0.064

SF16 2 0.128

SF8 4 0.256

SF4 8 0.384

2 x SF4 16 1.92

2 x SF2 32 3.84 Category 5

2 x SF4 + 2 x SF2 48 5.76 Category 6

2 x SF4 + 2 x SF2 64 11.52 Category 7


HSUPA Initial BitRate & Rate Adjustment (DCCC)

• When setting up a HSUPA RAB, a certain initial bitrate is directly assigned to the user

• Based on the requested throughput, RNC will either increase or decrease the assigned

throughput according to a set of adjustment rates (steps)

• During tests different initial bitrates/adjustment rates were put to test:

Previous Set Current Set

Initial bitrate (kbps)

384 1280

Enabled adjustment rates

(kbps)

128 608 384 1280

1280 2048

2048 5440

Note: rates adjustment reverted back

to previous steps after testing.


HSUPA Testing Scenarios

• Evaluating user experience with different sets of initial bitrates / adjustment

rates o Higher initial rate & less steps gives better experience, but causes more resource

utilization

o Lower initial rate & more steps gives accepted experience, but causes less resource

utilization

• Licensing RNC the following features:

o HSUPA 2ms/10ms TTI

o HSUPA 5.74Mbps per User


Practical Cases Analysis


Comparison Practical Cases

HSUPA Initial BitRate: 1280 kbps

HSUPA Adjustment Rates (Steps):

1- 608 kbps 2- 1280 kbps 3- 2048 kbps

step1

step2

step3

step1

step2

10ms TTI 10ms / 2ms TTI

Available Bandwidth could reach 2048kbps only with 2ms TTI enabled




UE requesting more throughput,

But 2048kbps step is never reached

UE having stable throughput

almost at maximum available bandwidth



step1

step2

step3


•When the upload session finishes, allocated bandwidth is reduced to conserve radio resource

•If any higher throughput is requested, DCCC will increase bandwidth accordingly


Practical Cases for HSUPA 5.74Mbps

Available Bandwidth could reach 5440 kbps only with 2ms TTI enabled

10ms / 2ms TTI 10ms / 2ms TTI

step1

step2

step3

step4


Traces

HSUPA 2ms TTI


Field investigation


Thanks!

=]

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