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We study information theoretic models of interference networks that consistof K Base Station (BS) - Mobile Terminal (MT) pairs. Each BS is connected tothe MT carrying the same index as well as L following MTs. We fix the value ofL and study the per user Degrees of Freedom (puDoF) in large networks. Weassume that each MT can be associated with N BSs, and these associations aredetermined by a cloud-based controller that has a global view of the network.An MT has to be associated with a BS, for the BS to transmit its message in thedownlink, or have its decoded message in the uplink. We propose puDoF innerbounds for arbitrary values of L when only the uplink is considered, andcharacterize the uplink puDoF value when only zero-forcing schemes are allowed.We then introduce new achievable average uplink-downlink puDoF values, and showtheir optimality for the range when N \leq (L/2) and when we restrict ourattention to zero-forcing schemes. Additionally, for the remaining range, wecharacterize the optimal downlink scheme when the uplink-optimal associationsare used. Finally, we show that the proposed scheme is informationtheoretically optimal for Wyner's linear interference network.

Joint Uplink-Downlink Cooperative Interference Management with Flexible Cell Associations