Interclass Collision Protection for IEEE 802.11e Wireless LANs

다국어 초록 (Multilingual Abstract)

Distributed Coordination Function (DCF) in IEEE 802.11 and Enhanced Distributed Channel Access (EDCA) in

IEEE 802.11e are contention-based access mechanism in wireless LAN. Both DCF and EDCA reduce collisions based

on Inter-Frame Space (IFS) and backoff mechanisms. However, collisions are unavoidable even with the two

mechanisms. Especially, in the EDCA, collisions can be classified into interclass and intra-class collision. To eliminate

interclass collision in wireless LAN, we propose an Interclass Collision Protection (ICP) scheme by employing

Collision Protection Period (CPP) after backoff. Different number of backoff time-slots is inserted to each class. Higher

class stations are allowed to transmit before lower class stations end backoff period. Analysis is performed with one

dimensional discrete-time markov chain for the EDCA and proposed ICP-based EDCA. Collision probability and

throughput of each channel access is examined. Throughput increase is more than doubled with reduced collision

probability when the system is saturated.

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