Relay-Assisted User Scheduling in Wireless Networks with Hybrid-ARQ

Details Relay-Assisted User Scheduling in Wireless Networks with Hybrid-ARQ Relay-Assisted User Scheduling in Wireless Networks with Hybrid-ARQ

2008-08-05

arxiv.org/abs/0808.0745v5

Computer Science

Information Theory

14 pages, 5 figures, submitted to the IEEE Transactions on Vehicular Technology in October 2008, revised in March 2009 and May

Scientific paper

This paper studies the problem of relay-assisted user scheduling for downlink wireless transmission. The base station or access point employs hybrid automatic-repeat-request (HARQ) with the assistance of a set of fixed relays to serve a set of mobile users. By minimizing a cost function of the queue lengths at the base station and the number of retransmissions of the head-of-line packet for each user, the base station can schedule an appropriate user in each time slot and an appropriate transmitter to serve it. It is shown that a priority-index policy is optimal for a linear cost function with packets arriving according to a Poisson process and for an increasing convex cost function where packets must be drained from the queues at the base station.

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