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Performance of enhanced multi-code spread slotted Aloha (EMCSSA) with voice and data

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2 Author(s)
Dastangoo, S. ; Lucent Technol., North Andover, MA, USA ; Vojcic, B.R.

We present an analytical framework which enables the MCSSA protocol defined and analyzed by Dastangoo, Vojcic and Daigle (see IEEE GLOBECOM '98) to support differentiated services (e.g., voice and data). The underlying principles to the MCSSA protocol consist of two elements. The first element concerns the users' random selection from a finite number of resources (i.e., channels or spread spectrum (SS) codes). The second is the simultaneous transmission of users' packets. These elements are realized through two stages of packet acquisition (Stage-I) and packet transmission (Stage-II). Therefore, a successful transmission depends not only upon the success in Stage-I, but also the success in Stage-II. To support multi-traffic classes requires several modifications to Stage-I of the MCSSA protocol. Naturally, voice traffic must be given preferential treatment over the data traffic, since the quality of service (QoS) of the former suffers more from excess access/queueing delays. In EMCSSA, we develop a priority mechanism in Stage-I which enables the voice users to contend, acquire, and reserve SS codes for the duration of their calls. Since the users' access to the resources in EMCSSA is distributed on a per-slot basis, each user's activity should be known to all. This is realized through a multi-level information feedback in Stage-I. We set the stage for both infinite population (Poisson/binomial model) and finite population (Markov model) cases. However, we only present the former. To assess the performance of the proposed protocol, we evaluate a commonly used performance metric: the average throughput

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Communications, 1999. ICC '99. 1999 IEEE International Conference on  (Volume:3 )

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