Anywlan_Perform ance Investigation of IEEE 802.11e EDCA Under Non-Saturation Condition Based on the

Abstract — T he IEEE 802．11e netw ork provides difrler．ent with QoS (Quality of service)guarantee for diferent tram c stream s． The E nhanted distributed channel access fED CA in IEEE 802．11e M AC protocol is proposed to support prioritized QoS on the basis of the Distributed coordination function fD CF in IEEE 802.11 、ve first build a new M arkov chain m odel fo r the ED C A ．The m odel takes into account both the idle state that represents that there are no packets to be transm itted and diferentiation based on difrlerent AIFS．value rArbitration inter．fram e space)for difFerent trafRc． W e can use the signal transfer function of the generalized Z．transfo rm dom ain state transition dia． gram to derive a probability distribution of the M A C layer service tim e and analyze the perform ance of E D C A from a non-saturated channel to a saturated m edium by using M ／G／1／g queuing mode1．The proposed model is calculated num erically and validated against sim ulation results，we observed a good m ateh betw een the analytical m odel and sim ulation． Sim ulation and theoretical results show that despite providing prloritized QoS，the EDcA still can not support strict QoS fo r real-time application． On the other hand．it is inevitable that there is unfairness of chan．nel access to prioritized tram c due to ED C A ．
Keywords —— IE EE802．1le， Enhanced distributed channel access(EDCA)，M ／G／1／K queuing mode1

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