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It has been shown that cooperative work of base stations (BSs) is effective for the disaster recovery, namely, even if BSs in some cells are destroyed and user terminals (UTs) should communicate with another BS in a far away distance, coordination scheme of survived BSs can mitigate the degradation of link quality in disaster cells. This paper extends this scheme to relay-aided case attempting the...
In actual cellular systems, base station (BS) may not be located in the cell center because of physical restrictions. This paper investigates, assuming such a situation, the effectiveness of BS cooperation (BSC) in MIMO (multiple input multiple output) cellular system under irregular cell geometry. The cell shapes are determined by BS position based on Voronoi diagram, namely, UTs (user terminals)...
This paper considers the problem of base station cooperation (BSC) in the cell edge of multi-cellular system in which, different from conventional works, the BS location is displaced from the hexagonal cell center. The initial cell geometry is nonuniformly determined based on Voronoi diagram, and BS-UT (user terminal) connection is flexibly selected based on channel condition between them. In the...
In cellular system, user terminals (UTs) are sometimes suffered from the attenuation of target signal from base stations (BSs) and severe interferences from adjacent cells, and their influence is serious particularly in the cell edge. This paper considers the performance improvement of multi-antenna cellular system under such a bad situation utilizing cooperative works of BSs and relay stations (RSs)...
In cellular systems, the user terminals are suffered from the attenuation of the signal from the base station (BS) and the interferences from other users. This paper considers the improvement of this bad situation by BS cooperation (BSC) in the downlink scenario assuming multi-antenna schemes, and compares the effectiveness of several strategies based on a three cell model. The result shows the advantage...
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