Title :
Cellular digital packet data network
Author :
Saha, Debabrata ; Kay, Stanley E.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., George Washington Univ., Washington, DC, USA
fDate :
8/1/1997 12:00:00 AM
Abstract :
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 from the pool of unused or free cellular analog voice channels. Detection as to whether a channel is free or occupied is mechanized through channel sniffers. Once the CDPD network seizes a channel, it continues to 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 network then hops to another free channel, if available. CDPD follows slotted nonpersistent digital-sense multiple access with collision detection (DSMA/CD). In addition, it performs channel-error detection and channel-error recovery. We investigate several aspects of the CDPD network, namely, the: (1) effect of CDPD on cellular voice and (2) the delay-throughput performance due to DSMA/CD with error detection
Keywords :
Reed-Solomon codes; access protocols; cellular radio; data communication; delays; digital radio; error correction codes; error detection codes; land mobile radio; multi-access systems; packet radio networks; telecommunication channels; CDPD networks; DSMA/CD; Reed-Solomon code; cellular analog voice channels; cellular digital packet data network; cellular voice system; channel error detection; channel error recovery; channel sniffers; collision detection; delay-throughput performance; mobile data transmission; radio resources; slotted nonpersistent digital sense multiple access; voice activity; Cellular networks; Cities and towns; Data communication; Delay effects; Forward contracts; IP networks; Law enforcement; Mobile communication; Protocols; Vehicle safety;
Journal_Title :
Vehicular Technology, IEEE Transactions on
