Abstract
Multihop cellular networks is an exciting and a fledgling area of wireless communication which offers huge potential in terms of coverage enhancement, data-rates, power reduction, and various other quality of service improvements. However, resource allocation in MCN is an NP-hard problem. Hence, significant research needs to be done in this field in order to efficiently design the radio network. In this paper, optimal position of relay stations in a hierarchical cluster-based two-hop cellular network is investigated. Vector algebra has been used to derive general equation for carrier-to-interference ratio (C/I) of a mobile station. It has been observed that when the transmit power of base station (BS) and the gateway (GTW)/relay station (RS) are same, the RSs should be located close to mid-point of BS and the edge of the cell. However, significantly, when the transmit power of the BS is greater than that of the GTW, then the RSs should be placed closer to the edge of the cell, in order to maximize the minimum C/I at any point in the cell. This in turn results in higher modulation technique at the physical layer, and hence, a higher data-rate to all the users in the system.
Highlights
The generation cellular networks need to provide very high data-rates to the end users in order to support the ever growing demand of high quality multimedia services while on the move
The data-rate can be increased by increasing the transmit power or by reducing the distance between the source and destination node
The mobile stations (MSs) in the outer region are grouped into several clusters, and these MSs communicate with the base station (BS) in two hops through the cluster-head nodes, which act as relay station (RS)/GTWs
Summary
The generation cellular networks need to provide very high data-rates to the end users in order to support the ever growing demand of high quality multimedia services while on the move. Since mobile stations (MSs) are energy constrained devices, the transmit power of the MSs cannot be increased indiscriminately, and traditional single-hop cellular networks cannot provide high data-rate communication. The cluster-based design is found to be superior in terms of the attainable system capacity than the benchmark algorithms available in the literature [17] In this architecture, the cells are divided into two regions, the inner and outer region. The MSs in the outer region are grouped into several clusters, and these MSs communicate with the BS in two hops through the cluster-head nodes, which act as RSs/GTWs. In this paper, the optimum position of the GTWs in the cluster-based architecture is investigated for different transmit power ratios between the BS and GTW.
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