Beam Grouping Based User Scheduling in Multi-Cell Millimeter-Wave MIMO Systems

This paper investigates the user scheduling in multi-cell millimeter-wave multiple-input multiple-output systems. The asymptotic analysis reveals that scheduling of users with larger effective channel gains is beneficial. Based on the relation between the inter-cell interference and the channel correlation, the users are grouped according to the beams they belong to. In accordance, scheduling of users in the same group will cause high inter-cell interference. Then, a user scheduling criterion which minimizes the inter-cell interference and maximizes the effective channel gain is proposed. Finally, the computational complexity of the proposed approach is analyzed and is compared with that of other approaches. The simulations verify that the proposed approach can mitigate more inter-cell interference than other approaches in favorable situations.