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In which hand of a mobile station can communicate with two base stations at the same time? 

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By using transmission space diversity at the base station for the forward link, the transmission signal of a base station intended for a mobile station will always be transmitted in the best possible path, while the transmission signals from this same base station intended for other mobile stations will not always be transmitted in this same path.
Each mobile may be connected to, at most, one of four surrounding base stations, effectively connecting and applying power control to the one with least attenuation.
The base stations jointly coordinate beamforming and scheduling, and thus perform a weaker form of cooperation among base stations than suggested in recently proposed joint transmission techniques.
A relay station can be used to extend the point-to-multipoint link between the base station and mobile stations.
We propose a new solution to the problem of positioning base station transmitters of a mobile phone network and assigning frequencies to the transmitters, both in an optimal way.
On the other hand, it has been well recognized that a mobile base station has significant advantages over a static one.
For the important case of two base stations, the expression is particularly simple.
The results have shown that interference alignment is underperforming with respect to the baseline using base station coordination, when a realistic number of base stations is considered.
Proceedings ArticleDOI
Matthias Herlich, Holger Karl 
31 May 2011
17 Citations
The analytical results show that the area a base station covers can be significantly increased when cooperative transmissions are introduced.

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