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Dynamic Packet Transmission Probability Control Scheme in CDMA S_ALOHA Systems  

임인택 (부산외국어대학교 컴퓨터공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.7A, 2003 , pp. 485-492 More about this Journal
Abstract
This paper proposes a transmission probability control scheme for guaranteeing fair packet transmissions in CDMA slotted ALOHA system. In CDMA slotted ALOHA system, the packets transmitted in the same slot act as multiple access interference, so that unsuccessful packet transmissions are caused entirely by multiple access interference. Therefore, in order to maximize the system throughput, the number of simultaneously transmitted packets should be kept at a proper level. In the proposed scheme, the base station calculates the packet transmission probability of mobile stations in the next slot according to the offered load and then broadcasts this probability to all the mobile stations. Mobile stations, which have a packet to transmit, attempt to transmit packet with the received probability. Simulation results show that the proposed scheme can offer better system throughput and average delay than the conventional scheme, and guarantee a good fairness among all mobile stations regardless of the offered load.
Keywords
CDMA S_ALOHA.;
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