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A scheduling approach for improved Quality of Service in Multi-hop relay based Wireless Cellular Networks

In this paper, we study the effect of multi hop relaying on the throughput of the downstream channel in cellular networks. In particular, we compare the throughput of the multihop system with that of the conventional cellular system, demonstrating the achievable throughput improvement by the multi hop relaying under transitive transmission considerations. We also propose a hybrid control strategy for the multihop relaying, in which we advocate the use of both, the direct transmission and the transitive multihop relaying. Our study shows that most of the throughput gain can be obtained with the use of a transitive relaying scheme. Substantial throughput improvement could be additionally obtained by operating the concurrent relaying transmission in conjunction with the non concurrent transmission. We also argue here that the multihop relaying technology can be utilized for mitigating unfairness in quality-of-service (QoS), which comes about due to the location-dependent signal quality. Our results show that the multihop system can provide more even QoS over the cell area. The multihop cellular network architecture can also be utilized as a selfconfiguring network mechanism that efficiently accommodates variability of traffic distribution. We have studied the throughput improvement for the uniform, as well as for the non uniform traffic distribution, and we conclude that the use of transitive relaying in cellular networks would be relatively robust to changes in the actual traffic distribution.