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OPPORTUNITIES AND CHALLENGES IN OFDMA-BASED CELLULAR RELAY NETWORKS: A RADIO RESOURCE MANAGEMENT PE

ABSTRACT The opportunities and flexibility in relay networks and orthogonal frequency-division multiple-access (OFDMA) make the combination a suitable candidate network and airinterface technologies for providing reliable and ubiquitous high data rate coverage in the next-generation cellular networks. Advanced and intelligent radio resource management (RRM) schemes are known to be crucial towards harnessing these opportunities in the future OFDMA-based relay-enhanced cellular networks. However, it is not very clear how to address the new RRM challenges (such as enabling distributed algorithms, intra/inter-cell routing, intense and dynamic co-channel interference, feedback overhead) in such complex environments comprising a plethora of relay stations of different functionalities and characteristics. Employment of conventional RRM schemes in such networks will be highly inefficient if not infeasible. The next-generation networks are required to meet the expectations of all wireless users irrespective of their locations. High data rate connectivity with mobility and reliability, among other features, are examples of these expectations. Therefore, fairness is a critical performance aspect that has to be taken into account in the design of prospective RRM schemes. This paper reviews some of the prominent challenges involved in migrating from the conventional cellular architecture to the relay-based type and discusses how intelligent RRM schemes can exploit the opportunities in the relay-enhanced OFDMA-based cellular networks. We identify the role of multi-antenna systems and explore the current approaches in literature to extend the conventional schedulers to the next-generation relay networks. The paper also highlights the fairness aspect in such networks in the light of the recent literature, provides some example fairness metrics, and compares the performances of some representative algorithms. INDEX TERMS RRM, OFDMA, cellular, relaying, scheduling, routing, throughput, fairness, load balancing.

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