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HSUPA Impacts to the Original Network

HSUPA Link Performance Analysis

HSUPA Cell Performance Analysis

HSUPA Impacts to the Original Network

HSUPA Link Performance Analysis

HSUPA Cell Performance Analysis

HSUPA Performance AnalysisHSUPA Performance Analysis

HSUPA cell performance analysis



58

HSUPA cell throughput demonstrates the function relationship between the average RoT of the cell

and the system throughput. Besides being influenced by such factors as the UE quantity, the

geographical position where the UE is located and the wireless propagation condition, UE data

transmission request, and the uplink interferences of the cells around it, it is also influenced by

different wireless and packet scheduling polices and scheduling algorithm.

The fairness curve refers to the density accumulation distribution function of the normalization of

user throughput by the average throughput of each user, and it reflects the scheduling fairness.

The service delay includes the packet call delay and packet delay. The packet call delay refers to the

time period between two consecutive packet transmission requests. For the FTP user, the packet

call delay refers to the time the FTP uploads the file. The packet delay refers to the time necessary

for the reception of the packet message at Node B.

RoT overload ratio reflects the ratio of RoT when it exceeds a certain designated RoT threshold

value

HSUPA cell performance analysis is evaluated in the following aspects: The

average throughput of cell, average throughput of a single user, UE

scheduling fairness, service delay and RoT overload rate

Influence of 2 ms TTI on system performance



59

Comparison of 2ms and 10ms Cell Throughput- Mixed Channel

In HSUPA, the shorter frame structure

whose TTI is 2ms is adopted. The shorter

frame structure can increase the

retransmission times of Layer 1 within the

designated time, thereby improving the link

efficiency and throughput. Corresponding

to the same physical layer delay, the

shorter frame structure can effectively

lower the delay of the upper-layertransmission

2ms vs. 10ms, mixed channel, PF

0

10

20

30

40

3 3.5 4 4.5 5 5.5 6 6.5

Avg. RoT (dB)

T h r o u g

h p u

t G a

i n ( % )

Packet Delay for FTP Users

0

5

10

15

20

25

30

35

3.5 4 4.5 5 5.5 6 6.5

P a c

k e

t D e

l a y

[ s ]

Average RoT [dB]TTI=2ms TTI=10ms

Average Packet Delay for FTP Users

Packet Delay for Video Users

00.20.40.60.81

1.21.41.61.8

3.5 4 4.5 5 5.5 6 6.5

P a c

k e

t D e

l a y

[ s ]

Average RoT [d B]TTI=2ms TTI=10ms

Average Packet Delay for Video Users

Influence of HARQ on system performance



60

Influence of HARQ on Cell Throughput

We conduct the simulated analysis on the influence of HARQ on the average throughput of the

cell when HARQ is on and when it is off. It can be seen that due to the adoption of HARQ and

the soft combining technology, the link spectrum efficiency is improved, and the cell throughput

is improved by at least 200kpbs. This corresponds to the improvement of HARQ to link

performance.

Influence of Soft Handover on System Performance



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Influence of Soft Handover on Cell Throughput

We analyze, via simulation, the influence on the average throughput of the cell in the system

when there has soft handover (includes softer handover) and when there is no soft handover.

It can be seen that due to the adoption of soft handover technology, the link diversity gain is

generated, and the cell throughput is improved by at least 120 kpbs.



AgendaAgenda

HSUPA Basic Principle

HSUPA Key Technologies

HSUPA Performance Analysis

HSUPA Evolution Strategy

HSUPA Basic Principle

HSUPA Key Technologies

HSUPA Performance Analysis

HSUPA Evolution Strategy

Radio Communication Technology DevelopmentOverview



63

The radio communication development process from 2G, 3G to 3.9G, is that of

developing from mobile voice service to high speed data service.

Nowadays the radio communication technology is evolved to 3.5G, to

WCDMA, it can provide commercial R5 version and trial R6 version.The R7/HSPA+ and R8/LTE standards are being consummated by 3GPP,

it is forecasted that the R7 will be frozen in 2007, R8 will be frozen in

2008.

To the development of radio communication technology, more attention should

be paid to the requirement of operators – the development target of system

from NGMN group

Radio Communication Technology Evolution



64

2G 2.5G 3G 3.5G 3. 75G 3.9G2.75G

GSM WCDMAR99GPRS

EDGE

HSDPA HSUPA

HSPA+

LTE

IS-95 CDMA20001X EV-DO

CDMA2000 1X

EV-DORev. A

EV-DORev. B

AIE

CDMA20001X EV-DV

WCDMA Technology Evolution Roadmap



65

GSMGPRS/EDGE

GSMGPRS/EDGE

3GR99

3GR99

3G+HSDPADownlink Enhanced

3G+HSDPADownlink Enhanced

3GHSDPA/HSUPA

Downlink/UplinkEnhanced

3GHSDPA/HSUPA

Downlink/UplinkEnhanced

GSM(GPRS/EDGE)GSM(GPRS/EDGE)3G3G

Enhanced UMTSEnhanced UMTS

Optimized UMTSOptimized UMTSNGMNNGMN

NGMNLTE,…

Broadband radioIP based wideband

Peer to Peer

NGMNLTE,…

Broadband radioIP based wideband

Peer to Peer

2002-3 2003-4 2005-6 2007-9 Af ter 2009

Year

DownlinkThroughput

64-144kbps 64-384kbps 384kbps-4Mbps 384kbps-7Mbps 20-50Mbps

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