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Relay-Assisted User Scheduling in Wireless Networks With Hybrid ARQ

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4 Author(s)
Lo, C.K. ; MITRE Corp., Bedford, MA, USA ; Hasenbein, J.J. ; Vishwanath, S. ; Heath, R.W.

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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Vehicular Technology, IEEE Transactions on  (Volume:58 ,  Issue: 9 )