Design and performance evaluation of an RRA scheme for voice-data channel access in outdoor microcellular environments

Authors:
Allan C. Cleary;Michael Paterakis
Affiliations:
Univ. of Delaware, Newark;Technical Univ. of Crete, Chania, Crete, Greece
Venue:
Mobile Networks and Applications - Special issue on channel access in wireless networks
Year:
1997

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Abstract

In PCS networks, the multiple access problem is characterized by spatially dispersed mobile source terminals sharing a radio channel connected to a fixed base station. In this paper, we design and evaluate a reservation random access (RRA) scheme that multiplexes voice traffic at the talkspurt level to efficiently integrate voice and data traffic in outdoor microcellular environments. The scheme involves partitioning the time frame into two request intervals (voice and data) and an information interval. Thus, any potential performance degradation caused by voice and data terminals competing for channel access is eliminated. We consider three random access algorithms for the transmission of voice request packets and one for the transmission of data request packets. We formulate an approximate Markov model and present analytical results for the steady state voice packet dropping probability, mean voice access delay and voice throughput. Simulations are used to investigate the steady state voice packet dropping distribution per talkspurt, and to illustrate preliminary voice-data integration considerations.