A MULTILAYER COLLISION RESOLUTION MULTIPLE-ACCESS PROTOCOL FOR WIRELESS NETWORKS

In mobile communication networks operating in unreliable physical tran smission, random access protocol with the collision resolution (CR) sc heme is more attractive than the ALOHA family including carrier sense multiple access (CSMA) [IEEE Networks (September 1994) 50-64], due to likely failure on the channel sensing. Being a member of CR family sch emes, a protocol known as non-preemptive priority multiple access (NPM A) is utilized in a new high-speed wireless local area network, HIPERL AN, standardized by European Telecommunication Standard Institute (ETS I). A conceptually three-layer CR multiple access protocol generalized from NPMA, supporting single type of traffic, is thus presented and a nalyzed in this paper. The CR capability of such a protocol (and hence NPMA) is proved to be significant by numerical substantiation that ad ditional collision detection schemes are dispensable; also its through put/delay performance is excellent when the proportion of the transmis sion phase to a channel access cycle is large enough (i.e., the winner of contention should transmit all of its packets successively). On th e other hand, the simulated performance of NPMA serving integrated tra ffic is not fully satisfactory, primarily due to its distributed contr ol mode and distinguishing traffic types only by the prioritization pr ocess.