Busy code broadcasting and sensing protocol for collision-free CDMA packet radio networks and its performance analysis

To relieve the contention in packet initiations in CDMA packet radio networks, a novel protocol, the busy code broadcasting and sensing protocol, is proposed, and its steady-state throughput-delay performance upper bounds are numerically analysed. The results reveal that a high throughput of about 0.47 (when the normalised channel traffic r=1) and a stable performance of the network can be achieved by busy code broadcasting and sensing to avoid possible packet conflicts in the CDMA packet radio channel. The hidden terminal problem which exists in carrier sense multiple access is avoided in the proposed protocol. The study also shows that the new protocol can use CDMA spreading codes more efficiently than can other conventional spreading code protocols.<>