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The highly directional beams applied in millimeter wave (mmWave) cellularnetworks make it possible to achieve near interference-free (NIF) transmissionunder judiciously designed space-time user scheduling, where the power ofintra-/inter-cell interference between any two users is below a predefinedthreshold. In this paper, we investigate two aspects of the NIF space-time userscheduling in a multi-cell mmWave network with multi-RF-chain base stations.Firstly, given that each user has a requirement on the number of space-timeresource elements, we study the NIF user scheduling problem to minimize theunfulfilled user requirements, so that the space-time resources can be utilizedmost efficiently and meanwhile all strong interferences are avoided. Anear-optimal scheduling algorithm is proposed with performance close to thelower bound of unfulfilled requirements. Furthermore, we study the joint NIFuser scheduling and power allocation problem to minimize the power consumptionunder the constraint of rate requirements. Based on our proposed NIFscheduling, an energy-efficient joint scheduling and power allocation scheme isdesigned with limited channel state information, which outperforms the existingindependent set based schemes, and has near-optimal performance as well.

Near Interference-Free Space-Time User Scheduling for MmWave Cellular Network