Mobility

Interclass Collision Protection for IEEE 802.11e Wireless LANs

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Executive Summary

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 back-off 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, the authors propose an Interclass Collision Protection (ICP) scheme by employing Collision Protection Period (CPP) after back-off. Different number of back-off timeslots are inserted to each class.

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