Signaling for downlink coordinated multipoint in a wireless communication system

摘要

Embodiments herein describe apparatuses, systems, and methods for signaling to support downlink coordinated multipoint (CoMP) communications with a user equipment (UE) in a wireless communication network. In embodiments, the UE may be configured with a plurality of channel state information (CSI) processes (e.g., via radio resource control (RRC) signaling) to use for providing CSI feedback to an evolved Node B (eNB) to support downlink CoMP communications. The UE may be configured with a plurality of sets of CSI processes. The UE may further receive a downlink control information (DCI) message from the eNB that indicates one of the configured sets of CSI processes on which the UE is to provide CSI feedback to the UE. The UE may generate the CSI feedback for the indicated set of CSI processes, and transmit the CSI feedback to the eNB in a CSI report.

主权项

1. An apparatus to be employed by a user equipment (UE), the apparatus comprising:
communications circuitry to communicate with an evolved Node B (eNB) over a wireless communications network; and feedback circuitry coupled to the communications circuitry, the feedback circuitry to:
receive, via the communications circuitry, a downlink control information (DCI) message from the eNB, the DCI message including a two-bit channel state information (CSI) request field, wherein the CSI request field is to have:
a first value to indicate that the feedback circuitry is to provide a CSI report for a first set of pre-configured CSI processes associated with a serving cell, wherein individual CSI processes are associated with a CSI reference signal (CSI-RS) resource and a CSI-interference measurement (CSI-IM) resource;a second value to indicate that the feedback circuitry is to provide a CSI report for a second set of pre-configured CSI processes; ora third value to indicate that the feedback circuitry is to provide a CSI report for a third set of pre-configured CSI processes;receive a CodebookSubsetRestriction parameter associated with individual CSI processes to indicate a subset of precoding matrix indicators within a codebook to be used by the UE for CSI reporting;generate CSI feedback for CSI processes indicated by the CSI request field based on the CodebookSubsetRestriction parameter; andtransmit, via the communications circuitry, a CSI report to the eNB on a physical uplink shared channel (PUSCH), the CSI report including the generated CSI feedback.