CELLULAR DIGITAL PACKET DATA NETWORK

Cellular digital packet data (CDPD) is a data network designed to meet growing mobile data transmission needs, CDPD networks can stand alone or overlay on the cellular voice system by drawing radio resources fr om the pool of unused or free cellular analog voice channels, Detectio n as to whether a channel is free or occupied is mechanized through ch annel sniffers, Once the CDPD network seizes a channel, it continues t o use the channel as long as it is free and leaves the channel within 40 ms of initiation of any voice activity on the channel-the CDPD netw ork then hops to another free channel, if available, CDPD follows slot ted nonpersistent digital-sense multiple access with collision detecti on (DSMA/CD). In addition, it performs channel-error detection and cha nnel-error recovery, In this paper, we investigate several aspects of CDPD network, namely, the: 1) effect of CDPD on cellular voice and 2) delay-throughput performance due to DSMA/CD with error detection.