User equipment

摘要

A Channel State Information (CSI) feedback method and a User Equipment (UE) are provided for better support of Joint Transmission (JT) and Beamforming/Coordinated Scheduling (CB/CS). For JT, phase information for an adjacent Base Station (BS) is fed back. For CB/CS, enhanced CSI for an adjacent BS is fed back. The UE according to the present invention includes: a coordinated BS set determining unit configured for determining a set of coordinated BSs participating in multi-BS coordination, the set of coordinated BSs containing a serving BS and at least one non-serving BS; and a CSI feedback unit configured for feeding back CSI for JT or CB/CS for each non-serving BS in the set of coordinated BSs. The present invention has the advantages of simple implementation and low overhead and is applicable in LTE-A and 4G systems.

主权项

1. A User Equipment (UE), comprising:
a memory; and a central processing unit (CPU) configured to: determine a set of coordinated BSs participating in multi-BS coordination, the set of coordinated BSs containing a serving BS and at least one non-serving BS; and feed back CSI for Joint Transmission (JT) or Coordinated Beamforming/Coordinated Scheduling (CB/CS) for each non-serving BS in the set of coordinated BSs, wherein the CPU is configured for determining whether to feed back CSI for JT or for CB/CS based on a system parameter configured by the serving BS in a semi-static manner via high layer signaling or MAC signaling, the CPU is configured for feeding back different CSI in Sub-Mode 1 of feedback Mode 1-1 depending on whether the CSI to be fed back is for JT or for CB/CS, the CPU is configured for:
feeding back RI and W1 in the feedback Type 5; orfeeding back RI and eW1 in the new feedback Type 5 in case that the CSI to be fed back is for CB/CS, and eW1 is obtained by increasing a down-sampled set of W1.