Method for dynamic CSI feedback
First Claim
1. A method of operation of a User Equipment, UE, in a cellular communications network to provide Channel State Information, CSI, reporting, comprising:
- receiving a configuration of a set of Channel State Information Reference Symbol, CSI-RS, resources for the UE;
receiving an indication from a base station of the cellular communications network to disable inter-subframe channel interpolation of CSI-RS estimates across subframes;
receiving an indication from the base station of the cellular communications network to disable combining of CSI Interference Measurement, CSI-IM, estimates across subframes;
in response, performing one or more CSI-RS measurements with inter-subframe channel interpolation of CSI-RS estimates across subframes disabled; and
transmitting a CSI report to the base station determined from the one or more CSI-RS measurements, wherein the CSI report is for a subset of the set of CSI-RS resources configured for the UE.
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Accused Products
Abstract
Systems and methods for providing Channel State Information (CSI) feedback in a cellular communications network are disclosed. In some embodiments, a base station of a cellular communications network disables inter-subframe channel interpolation of CSI-RS estimates across subframes at the wireless device and receives one or more CSI reports from the wireless device that are generated by the wireless device with inter-subframe channel interpolation of CSI-RS estimates across subframes disabled in response to the base station disabling inter-subframe channel interpolation of CSI-RS estimates across subframes at the wireless device. In this manner, CSI feedback is improved particularly in embodiments in which the base station transmits a beamformed CSI-RS resource(s) and reuses the same CSI-RS resource(s) for different beams over time.
48 Citations
15 Claims
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1. A method of operation of a User Equipment, UE, in a cellular communications network to provide Channel State Information, CSI, reporting, comprising:
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receiving a configuration of a set of Channel State Information Reference Symbol, CSI-RS, resources for the UE; receiving an indication from a base station of the cellular communications network to disable inter-subframe channel interpolation of CSI-RS estimates across subframes; receiving an indication from the base station of the cellular communications network to disable combining of CSI Interference Measurement, CSI-IM, estimates across subframes; in response, performing one or more CSI-RS measurements with inter-subframe channel interpolation of CSI-RS estimates across subframes disabled; and transmitting a CSI report to the base station determined from the one or more CSI-RS measurements, wherein the CSI report is for a subset of the set of CSI-RS resources configured for the UE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A User Equipment, UE, in a cellular communications network to provide Channel State Information, CSI, reporting, comprising:
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means for receiving a configuration of a set of Channel State Information Reference Symbol, CSI-RS, resources for the UE; means for receiving an indication from a base station of the cellular communications network to disable inter-subframe channel interpolation of CSI-RS estimates across subframes; means for receiving an indication from the base station of the cellular communications network to disable combining of CSI Interference Measurement, CSI-IM, estimates across subframes; means for performing one or more CSI-RS measurements with inter-subframe channel interpolation of CSI-RS estimates across subframes disabled in response to receiving the indication; and means for transmitting a CSI report to the base station determined from the one or more CSI-RS measurements, wherein the CSI report is for a subset of the set of CSI-RS resources configured for the UE. - View Dependent Claims (14)
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15. A wireless device in a cellular communications network to provide Channel State Information, CSI, reporting, comprising:
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at least one transmitter; at least one receiver; at least one processor; and memory storing software instructions executable by the at least one processor whereby the UE is operative to; receive, via the at least one receiver, an indication from a base station of the cellular communications network to disable inter-subframe channel interpolation of Channel State Information Reference Symbol, CSI-RS, estimates across subframes; receive, via the at least one receiver, an indication from a base station of the cellular communications network to disable combining of Channel State Information Interference Measurement, CSI-IM, estimates across subframes; in response, perform one or more CSI-RS measurements with inter-subframe channel interpolation of CSI-RS estimates across subframes disabled; and transmitting a CSI report to the base station determined from the one or more CSI-RS measurements.
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Specification