Abstract
A modified multi-access protocol for data traffic in a packet radio network using code division multiple access (CDMA) is introduced and analysed. The scheme employs CDMA in a centralised channel load-sensing scheme with channel overload (collision) detection. The data users contend for channel access using a slotted spread spectrum inhibit-sense multiple access (ISMA) scheme. For a given maximum bit error rate due to mutual multi-access interference (MAI), an upper threshold (/spl beta/) on the number of users allowed into the channel can be determined. This paper proposes a second lower threshold /spl alpha/ to improve the system performance by adding an access control mechanism. This extension attempts to avoid overloading the channel by blocking new packets when the load is nearing the threshold /spl beta/. Analytical and simulation results show that an improved throughput performance can be obtained by implementing a centralised load sensing scheme and channel control mechanism. In addition, it is shown that the blocking threshold should be dynamic with respect to the measured channel load, as an optimum value for throughput exists for a given load.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
