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Cluster-Based Design for Two-hop Cellular Networks

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DOI: 10.4236/ijcns.2008.14045    5,157 Downloads   9,597 Views   Citations

ABSTRACT

Optimal resource allocation with an objective of maximizing the system capacity is an NP-hard problem in multihop cellular networks. Hence, different heuristic algorithms have been developed over the years that would improve the network system capacity. In this paper, a novel cluster-based architecture is proposed for a two-hop cellular network whereby the transmission distance between any communicating pair is restricted to half the cell radius. In this design, a given radio resource is used by two simultaneously communicating pairs in every hexagonal cell, but for only half the time slot period. The characteristic feature of this cluster-based design is that it enables a frequency reuse ratio of one. The proposed hierarchical system is analyzed and tested under realistic propagation conditions including lognormal shadowing. It has been observed that the system capacity of a cluster-based design is 2.5 times that obtained from the single-hop cellular system with no relaying. In addition, the cluster-based design achieves higher capacity compared to state-of-the-art two-hop algorithms. This is an important finding since the hierarchical cluster-based approach has fewer degrees of freedom in the selection of the routing path for the end-to-end connection. Practical routing algorithms should be able to benefit from this.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

H. VENKATARAMAN, S. SINANOVIC and H. HAAS, "Cluster-Based Design for Two-hop Cellular Networks," International Journal of Communications, Network and System Sciences, Vol. 1 No. 4, 2008, pp. 370-385. doi: 10.4236/ijcns.2008.14045.
  
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