A novel radio channel control method for improved multiple access schemes

This paper considers a recursive method for individual users to decide retransmission probability to improve channel utilisation for a grouped slotted Aloha system in Delayed First Transmission model, in which all the users are divided into two groups according to the signal power. Assume that the total channel traffic can be formulated as a Poisson stream with the mean Ki (i = 1,2) and each user has a counter to update the backlog in each group according to a quadruple feedback transmitted during the current slot from the base station. This information is immediately available to each user in both groups. The optimal channel utilisation which maximises the total channel throughput can be obtained if the individual user re-transmits a packet with the probability \( {p_{{k,i}}} = \frac{{{K_i}}}{{{S_{{k,i}}}}} \). The simulation shows that the total throughput of 0.521 is obtained with 0.328 for a higher power group and 0.193 for the lower power group.

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