Application Delay Modelling for Variable Length Packets in Single Cell IEEE 802.11 WLANs

摘要

In this paper, we consider the problem of modelling the average delayexperienced by an application packets of variable length in a single cell IEEE802.11 DCF wireless local area network. The packet arrival process at each nodei is assumed to be a stationary and independent increment random process withmean ai and second moment a(2) i . The packet lengths at node i are assumed tobe i.i.d random variables Pi with finite mean and second moment. A closed formexpression has been derived for the same. We assume the input arrival processacross queues to be uncorrelated Poison processes. As the nodes share a singlechannel, they have to contend with one another for a successful transmission.The mean delay for a packet has been approximated by modelling the system as a1-limited Random Polling system with zero switchover times. Extensivesimulations are conducted to verify the analytical results.