DYNAMIC VERTICAL SECTORIZATION

摘要

Vertical sectorization is discussed in which several vertical sectors are dynamically formed based on user equipment (UE) feedback in the elevation domain. For example UEs with similar feedback in the elevation domain may be grouped to form a cluster for which a base station will form a cluster-specific vertical beam. Feedback may be implemented using open-loop schemes, where UEs feedback an index of the best beams observed, or close-loop schemes, where UEs feedback an elevation metric, such as an elevation rank indicator, precoding matrix indicator (PMI), or channel eigen vector. In such aspects, vertical sectors are only formed when necessary and less interference may result between vertical sectors if carefully designing orthogonal sector beams. Moreover, lower overhead and better speed/density performance may be achieved compared against UE-specific elevation beamforming.