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The next generation of mobile systems will most likely be B-ISDN compatible. This paper considers buffer fill distribution in a mobile ATM environment. The ATM protocol standard specifies fixed size 53 byte cells consisting of 48 bytes of payload and a 5 byte header. Because the ATM cell sizes are relatively small, there will be a moderate amount of cut-through. This means that there is an increase in performance because ATM cells will be available for use immediately after being de-encapsulated from the wireless media carrying the ATM cells. Also, mobile systems will be able to take advantage of the standardized QoS parameters as well as having an end-to-end standards based protocol with fixed networks. This will lead to standards based integration with fixed networks and integration of voice, data, and video.

M/D/1 analysis of fixed size ATM cells provides optimistic results because M/D/1 assumes that sources are Poisson. A technique which does not make that assumption provides a more accurate analysis and is extended in this paper to a mobile environment.

It appears that there has been little work done concerning the effects of mobility on ATM. This paper will attempt to build a foundation for analyzing mobile ATM networks by extending previous work for fixed ATM environments. This analysis would be useful for determining the base station queue fill distribution and probability of cell loss in a mobile environment. It would also be useful for simplifying mobile CBR cell simulations.

Steve Bush
Sun Aug 25 17:38:45 CDT 1996