Modeling CDPD Channel Holding Times

Abstract

Cellular Digital Packet Data (CDPD) provides wireless data communication services to mobile users by sharing unused RF channels with AMPS on a non-interfering basis. To prevent interference on the voice activities, CDPD makes forced hop to a channel stream when a voice request is about to use the RF channel occupied by that channel stream. The number of forced hops is affected by the voice channel selection policy. We propose an analytic model to investigate the CDPD channel holding time for the least-idle and random voice channel selection policies. Under various system parameters and voice channel selection policies, we provide guidelines to reduce the number of forced hops.