Relay Selection and Resource Allocation in LTE-Advanced Cognitive Relay Networks

In this work, we consider the problem of joint relay selection and resource allocation in Long Term Evolution-Advanced (LTE-A) systems which provides both cognitive radio and relaying scheme capabilities. We assume that the total network is deployed in an overlay scheme where the primary user communicates via a relay assisted LTE-A network, some of the secondary users play the relaying role and the remained nodes are communicate by centralized network model in the licensed spectrum. In the first step of the proposed procedure, the cognitive radio base station (CBS) selects the higher gain component carrier (CC) channels and allocates one CC to each secondary terminal which is denoted as customer premise equipment (CPE). The power updating algorithm is provided in the second step of the proposed scheme which gives the maximum SINR in the secondary CPEs while keeping the minimum SINR threshold at the primary receiver. In the third step of the proposed algorithm, CCs are re-allocated to cognitive radio CPEs. Simulation results are provided to compare the performance of our proposed relay selection and resource allocation algorithms with random relay selection and uniform power allocation respectively. Copyright © 2011 Praise Worthy Prize S.r.l. All rights reserved.