Abstract:
In this paper, a game theoretic relay load balancing and power allocationscheme is proposed for downlink transmission in
a decode-and-forward orthogonal frequency division multiple access-based cellular relay network. A system with a base
station communicating with multiple users via multiple relays is considered. The relays have limited power, which must be
divided among the users they support. In traditional scheme, each relay simply divides its transmit power equally among all
its users. Moreover, each user selects the relay with the highest channel gain. In this work, we do not apply the traditional
relay scheme. It is because the users are distributed randomly, and by applying the traditional relay selection scheme, it
may happen that some relays have more users connected to them than other relays, which results in having unbalanced
load among the relays. In order to avoid performance degradation, achieve relay load balancing, and maximize the total
data rate of the network, a game theoretic approach is proposed, which efficiently assigns the users to relays. The power of
each relay is wisely distributed among users by the efficient power allocation scheme. Simulation results indicate that the
proposed game-based scheme can considerably improve the average sum-spectral efficiency. Moreover, it shows that by
applying the game, users who can connect to uncongested relays join them as opposed to connecting to congested relays.
