Optimal Power Allocation and Scheduling for Two-Cell Capacity Maximization

Abstract
— We consider,the problem,of optimally,allo- cating the base station transmit power,in two neighboring cells for a TDMA wireless cellular system, to maximize the total system throughput,under,interference and noise im- pairments. Employing dynamic reuse of spectral resources, we impose,a peak power,constraint at each base station and allow for coordination,between,the base stations. By an analytical derivation,we find that the optimal,power allocation then has a remarkably,simple nature: Depending on the noise and channel gains, transmit at full power only at base station 1 or base station 2, or both. Utilizing the optimal power,allocation we study optimal link adaptation, and compare to adaptive transmission without,power,control. Results show,that allowing,for power,control significantly increases the overall capacity for an average user pair, in addition to considerable power savings. Furthermore, we investigate power adaptation in combination,with,scheduling,of users in a time slotted system. Specifically, the capacity-optimal single-cell sched- uler [1] is generalized to the two-cell case. Thus, both power,allocation and multiuser,diversity are exploited to give substantial network,capacity gains.

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