Channel state information feedback for carrier aggregation

摘要

Techniques for reporting channel state information (CSI) in a multi-carrier wireless communication system are disclosed. In some examples, a user equipment determines a configuration for reporting CSI for each component carrier (CC) in a plurality of component carriers. For a first subframe, the user equipment determines a priority for transmitting CSI associated with the plurality of CCs based at least in part on the configuration. The user equipment sends, in the first subframe, a CSI report including the prioritized CSI. The CSI report can include CSI for a single CC, or CSI for multiple CCs. For multi-CC reporting of CSI, the user equipment can multiplex CSI reports or CSI elements for the plurality of CCs up to an available payload size.

主权项

1. A method of wireless communication, comprising:
determining, by a user equipment, a configuration for reporting channel state information (CSI) for each component carrier (CC) in a plurality of CCs based on a radio resource control (RRC) message; determining a priority, for a first subframe, for transmitting CSI associated with each of one or more of the CCs in the plurality of CCs based on at least one of: the configuration, a CSI report type, or a carrier index; determining a payload size available in a physical uplink control channel (PUCCH) for reporting CSI in the first subframe, wherein the payload size available in the PUCCH depends upon a transmission format used for the first subframe; determining whether CSI for one or more CCs of the plurality of CCs collide with each other in the first subframe; and transmitting, by the user equipment, a CSI report in the first subframe based on the priority, wherein the CSI for the one or more CCs of the plurality of CCs is transmitted in the CSI report up to the determined payload size available in the PUCCH in response to determining the collision of the CSI for the one or more CCs of the plurality of CCs in the first subframe, wherein the one or more CCs are selected according to the priority, wherein the CSI for the one or more CCs of the plurality of CCs that does not fit within the determined payload size available in the PUCCH is dropped.