Multi-cell joint processing at the base station (BS) side has been identified as a keyapproach for enhancing network performance. In stead of tuning their physical andlink/MAC layer parameters (power level, time slot, subcarrier usage, beamformingcoefficients, etc.) separately, or decoding independently of one another, the BSscoordinate their operations on the basis of global channel state and/or user datainformation that are exchanged over backhaul links among several cells [3, 4].In the 5G cellular network, to support the extreme data traffic explosion,more aggressive spectrum reuse and much higher network capacity are needed.An effective way to increase the network capacity is to make the cells smaller [5].On one hand, the deployment of small size cells shortens the distance between BSs,which facilitates the inter-cell cooperation. On the other hand, within small cells, the cell-edge users may receive strong interference from adjacent cells. Such inter-cellinterference (ICI) must be coordinated jointly by BSs. Hence, multi-cell cooperationis not only suitable, but also necessary for 5G networks.There are several possible levels of cooperations depending on the amount ofoverhead added on the backhaul and feedback channels.
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