1

Performance of a Mixed-Traffic CDMA2000 Wireless Network With Scalable Streaming Video

Joe Huang, Richard Yuqi Yao, Yong Bai, and Szu-Wei WangIEEE Transactions on Circuits and Systems for Video Technology, Vol. 13, No. 10,

October 2003

Presentation by Tony Sung, MC Lab, IE CUHK22nd March 2005

2

CDMA2000

3

CDMA2000 Layer Structure

4

CDMA2000 Physical Layer

5

The Simulation

Event-driven

Multi-cell Multi-user

Mixed-Traffic

Scalable Video

Dynamic Rate Control

6

Air Interface

Power:

20W Max., 16W for traffic, 4W for pilot, paging and sync

Arrangement:

19 3-sector cells on a hexagonal regular grid

Path-loss:

ITU recommended model which leads to a cell size around 3.4km based on a voice link budget

Fading:

Shadow fading, S.D. = 8dBCorrelation length = 200mStation-station correlation = 0.5

Mobility:

Data – PedestrianVoice – Mixture of Pedestrian and Vehicular

Power Allocation:

Pre-simulated link-level data, decision made only once a second

Handoff:

Dynamic thresholdSoft/softer for FCH only,decision made only once a second

7

Medium Access Control

Call Admission

Burst Allocation

Burst Admission Control

Rate Assignment

8

Traffic Model

Voice Data Video

Poisson process Web-browsing model

Poisson process

Holding time:Exponential, with mean = 90s

Poisson session arrivalGeometrically distributed pages per session, reading time, and object countPacket size follows a Pareto distribution

Clip duration:Shifted exponential with min = 5s, mean = 60s

Bitrate:14.75-64.75kbpsor 34.75kbps

9

Simulation Results

Voice Only

Web Only

Video Only

Mixed

10

Voice Traffic Only

11

Web Traffic Only

12

Video Traffic Only

13

Video Traffic Only

14

Mixed Traffic

15

Mixed Traffic

16

Conclusion

Event-driven system-level simulation

Erlang

Performance comparison

Multiplexing gain

Scalable video