Channel state information reporting enhancements for unlicensed coordinated multipoint
AssigneeQUALCOMM Incorporated
InventorsSrinivas Yerramalli, Xiaoxia Zhang, Seyed Ali Akbar Fakoorian, Jing Sun, Tamer Kadous
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Abstract
Techniques and apparatus for reporting channel state information (CSI) for unlicensed coordinated multipoint (CoMP) operations are provided. One technique includes determining, based on one or more conditions, for each of a plurality of base stations available for a coordinated multipoint (CoMP) transmission, whether the base station has transmitted a channel state information reference signal (CSI-RS) in unlicensed spectrum. CSI feedback is reported based on the determination.
Claims20
A method for wireless communication by a user equipment (UE), comprising:
- determining, for each of a plurality of base stations available for a coordinated multipoint (CoMP) transmission, whether the base station has transmitted a channel state information reference signal (CSI-RS) in unlicensed spectrum, wherein the determination is based on one or more conditions;
- and
- reporting channel state information (CSI) feedback based on the determination, comprising:
- using a first CSI reporting configuration to report the CSI feedback when the determination is that each of the plurality of base stations has transmitted a CSI-RS in the unlicensed spectrum;
- and
- using a second CSI reporting configuration to report the CSI feedback when the determination is that at least one first base station of the plurality of base stations has not transmitted a CSI-RS in the unlicensed spectrum.
An apparatus for wireless communication, comprising:
- at least one processor configured to determine, for each of a plurality of base stations available for a coordinated multipoint (CoMP) transmission, whether the base station has transmitted a channel state information reference signal (CSI-RS) in unlicensed spectrum, wherein the determination is based on one or more conditions;
- a transmitter configured to report channel state information (CSI) feedback based on the determination, wherein reporting the CSI feedback comprises:
- using a first CSI reporting configuration to report the CSI feedback when the determination is that each of the plurality of base stations has transmitted a CSI-RS in the unlicensed spectrum;
- and
- using a second CSI reporting configuration to report the CSI feedback when the determination is that at least one first base station of the plurality of base stations has not transmitted a CSI-RS in the unlicensed spectrum;
- and
- a memory coupled to the at least one processor.
A method for wireless communications by a base station, comprising:
- determining, for each of a plurality of other base stations that are available to participate in a coordinated multipoint (CoMP) transmission with the base station, whether the other base station has transmitted a channel state information reference signal (CSI-RS) in unlicensed spectrum;
- determining a channel state information (CSI) reporting configuration for a user equipment (UE) to use to report CSI, based on the determination of whether each of the other base stations has transmitted a CSI-RS in the unlicensed spectrum;
- and
- transmitting an indication of the CSI reporting configuration to the UE.
Dependencies are inferred from the claim text.