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Author:Wei, Wei
Title:Voice Traffic Performance in a Wireless LAN using the Point Coordination Function
Puheliikenteen suorituskyky pistekoodinointifunktiota käyttävässä WLAN:ssa
Publication type:Master's thesis
Publication year:2004
Pages:iii + 67 s. + liitt. 14      Language:   eng
Department/School:Sähkö- ja tietoliikennetekniikan osasto
Main subject:Tietoliikennetekniikka   (S-72)
Supervisor:Häggman, Sven-Gustav
Instructor:Hall, Michael
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:WLAN
DCF
PCF
PCM
VoIP
Abstract (eng): IEEE 802.11 (WLAN) has been designed primarily for non-real-time data applications with Distributed Coordination Function (DCF).
For transmission of real-time data, the supplementary medium access protocol Point Coordination Function (PCF) is used, which resides on top of DCF and uses a centralized polling scheme.

This thesis implements the basic Point Coordination Function algorithm in a time-driven simulation program written in C language, and evaluates the performance of voice transmission in a Wireless LAN with PCF supported.
The evaluation covers the throughput, delay distribution, the frame loss rate, and compares the performance for two kinds of PCM payload length.

The simulation results show that the proper superframe size should be approximately similar to the traffic interval, which results in good performance.
Further, the simulation shows that long payload provides higher throughput and lower frame loss rate than short payload, but meanwhile, long payload brings longer access delay.
When the number of VoIP mobile stations increases, the performance degrades dramatically.
Therefore, PCF provides limited good service differentiation to the real-time applications.
ED:2004-06-09
INSSI record number: 25284
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