Spread-sprectrum CDMA packet radio MAC protocol using channel overload detection and blocking

Authors:
Garth Judge;Fambirai Takawira
Affiliations:
Univ. of Natal, Durhan, South Africa;Univ. of Natal, Durhan, South Africa
Venue:
Wireless Networks
Year:
2000

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Abstract

An analytical and simulation performance evaluation is presented for a multi‐access protocol for a data packet radio network with a limited user capacity. The network employs direct‐sequence code division multiple access (DS‐CDMA) in a centralised channel load‐sensing scheme with channel overload (collision) detection and blocking via a separate ancillary channel state information broadcast system. Traffic models that incorporate both a finite population and an infinite population and variable length data messages are considered. Results show that an improved throughput/delay performance can be obtained by implementing a channel overload detection (message dropping) scheme as well as a channel overload avoidance (message blocking) scheme. The channel overload threshold β is fixed at the system's maximum user capacity whereas it is shown that the overload avoidance blocking threshold α should be variable and dependent on the mean message arrival rate.