Resource Allocation in OFDMA Relay-Enhanced Cellular Networks
نویسندگان
چکیده
v ness. Simulation results indicate that CS-VF is more adaptable to different traffic distributions and dynamic network topologies. On the other hand, the proposed semi-distributed resource allocation scheme consists of a constant power allocation, adaptive subframe partitioning (ASP), and link-based or end-to-end packet scheduling. Simulation results indicate that the ASP algorithm increases system utilization and fairness. Max C/I and PF scheduling algorithms extended using the end-to-end approach obtain higher throughput than those using the link-based approach, but at the expense of more system overhead for information exchange between BS and RSs. The resource allocation scheme using ASP and end-to-end PF scheduling achieves a tradeoff between system throughput maximization and fairness. Finally, we compare four relay-channel partition and reuse schemes in a multi-cell scenario from interference mitigation and throughput improvement points of view. Among these four schemes, 7-part partitioning (PF7) and 4-part partitioning (PF4) schemes mitigate co-channel interferences by relay-channel partitioning, while the other two schemes include partial reuse (PR) and full reuse (FR) schemes improve the throughput by relaychannel partition as well as reuse. Specially, the PR scheme achieves a tradeoff between spectral efficiency and outage. In conclusion, we formulate the optimal resource allocation problem under different assumptions in OFDMA relay-enhanced cellular networks and give both theoretically and practically efficient polynomial-time solutions. From the theoretical point of view, we use optimization approaches including continuous relaxation and dual decomposition to find the jointly optimized power allocation, path selection and subchannel scheduling to achieve proportional fairness. From the implementation point of view, we propose two
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تاریخ انتشار 2010