Study of Medium Access Delay in IEEE 802.11 Wireless Networks

Yantai SHU
Oliver YANG
Guanghong WANG

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.4    pp.1284-1293
Publication Date: 2006/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.4.1284
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
IEEE 802.11,  Medium access delay,  DCF,  Markov chain model,  

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With the rising popularity of delay-sensitive real-time multimedia applications (video, voice, and data) in IEEE 802.11 wireless local area networks (WLANs), it is becoming important to study the medium access control (MAC) layer delay performance of WLANs. The MAC layer delay can be classified into two categories: 1) medium access delay, and 2) delay at interface queue (IFQ). In this paper, based on a two-dimensional chain model, we analyze the medium access delay and give a method to calculate the IFQ delay. The proposed analysis is applicable to both the basic access and the RTS/CTS access mechanisms. Through extensive simulations, we evaluate our model. The simulation results show that our analysis is extremely accurate for both basic access and RTS/CTS access mechanism of the 802.11 DCF protocol.