Title :
A new efficient contentionless access protocol for packet data transmission in CDMA systems
Author :
Sun, Songson ; Krzymien, Witold A. ; Darian, Bahman
Author_Institution :
Wireless Commun. Div., Conexant Syst. Inc., Irving, TX, USA
Abstract :
A new hybrid spread spectrum/TDMA access protocol for wideband CDMA is introduced. Each TDMA frame is somewhat longer than an access probe, and includes several overlapping but offset in time (by an interval called minislot) access probe slots assigned to specific registered mobile users. All registered mobile users use the same spreading sequence to spread their respective access probes. Separate detection of access probes is possible due to the suitable time offsets between them. The performance of the access protocol is compared with an access protocol similar to the one used in IS-95 and W-CDMA, based on slotted ALOHA. It is shown that the new protocol has superior performance at different values of offered traffic
Keywords :
access protocols; cellular radio; code division multiple access; data communication; packet radio networks; spread spectrum communication; time division multiple access; CDMA systems; W-CDMA; access probe slots; contentionless access protocol; hybrid spread spectrum/TDMA access protocol; packet data transmission; registered mobile users; spreading sequence; third generation cellular radio; time offsets; wideband CDMA; Access protocols; Data communication; Delay; Land mobile radio cellular systems; Multiaccess communication; Packet switching; Probes; Road accidents; Throughput; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851413
