Channel state information for adaptively configured TDD communication systems
First Claim
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1. A method comprising:
- transmitting, by a base station to a User Equipment (UE), signaling indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction can be both from the base station to the UE and from the UE to the base station, and wherein each SF of the ten SFs has a unique time domain index; and
transmitting, by the base station, a control channel configured to convey a DL Control Information (DCI) format indicating an adaptation of the first TDD UL-DL configuration to a second TDD UL-DL configuration;
configuration information for;
resources of a non-zero power Channel State Information Reference Signal (CSI-RS)resources of a first Channel State Information Interference Measurement (CSI-IM), andresources of a second CSI-IM wherein the non-zero power CSI-RS resources, the first CSI-IM resources and the second CSI-IM resources are respectively in a SF that is a DL SF, the DL SF, and an UL SF in the first TDD UL-DL configuration;
wherein a system information block (SIB) indicating the first TDD UL-DL configuration, the DCI format indicating the second TDD UL-DL configuration, the configuration information is configured to cause the UE to measure a first quantity based on signaling received in the non-zero power CSI-RS resources and on the first CSI-IM resources and a second quantity based on signaling received in the non-zero power CSI-RS resources and on the second CSI-IM resources when the UL SF is a DL SF in the second TDD UL-DL configuration.
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Abstract
Methods and apparatus of a base station or a User Equipment (UE) in communication with each other are provided. The UE is configured by the base station for operation with an adapted Time Division Duplex (TDD) UpLink-DownLink (UL-DL) configuration. A process enabling the base station to configure a UE with resources for obtaining channel and interference measurements in two sets of Transmission Time Intervals (TTIs) and a process for the UE to obtain a Channel State Information (CSI) from the channel and interference measurements in the two sets of TTIs are provided.
54 Citations
20 Claims
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1. A method comprising:
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transmitting, by a base station to a User Equipment (UE), signaling indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction can be both from the base station to the UE and from the UE to the base station, and wherein each SF of the ten SFs has a unique time domain index; and transmitting, by the base station, a control channel configured to convey a DL Control Information (DCI) format indicating an adaptation of the first TDD UL-DL configuration to a second TDD UL-DL configuration; configuration information for; resources of a non-zero power Channel State Information Reference Signal (CSI-RS) resources of a first Channel State Information Interference Measurement (CSI-IM), and resources of a second CSI-IM wherein the non-zero power CSI-RS resources, the first CSI-IM resources and the second CSI-IM resources are respectively in a SF that is a DL SF, the DL SF, and an UL SF in the first TDD UL-DL configuration; wherein a system information block (SIB) indicating the first TDD UL-DL configuration, the DCI format indicating the second TDD UL-DL configuration, the configuration information is configured to cause the UE to measure a first quantity based on signaling received in the non-zero power CSI-RS resources and on the first CSI-IM resources and a second quantity based on signaling received in the non-zero power CSI-RS resources and on the second CSI-IM resources when the UL SF is a DL SF in the second TDD UL-DL configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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transmitting, by a base station to a User Equipment (UE), signaling indicating a first Time Division Duplexing (TDD) UpLink-Downlink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction can be both from the base station to the UE and from the UE to the base station, and wherein each SF of the ten SFs has a unique time domain index; and a control channel conveying a DL Control Information (DCI) format indicating an adaptation of the first TDD UL-DL configuration to a second TDD UL-DL configuration, wherein, in response to receiving the signaling indicating the first TDD UL-DL configuration and the DCI format indicating the second TDD UL-DL configuration; and the UE measures a first quantity in a first set of DL SFs of the second TDD UL-DL configuration to determine a first Channel State Information (CSI) and a second quantity in a second set of DL SFs of the second TDD UL-DL configuration to determine a second CSI, wherein the UE discards a measurement of the second quantity in a DL SF from the second set of DL SFs from the determination of the second CSI if the measurement value is smaller than a second threshold value. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A base station comprising:
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a transmitter; and a processor configured to cause the transmitter to transmit, to a User Equipment (UE); signaling indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction can be both from the base station to the UE and from the UE to the base station, and wherein each SF of the ten SFs has a unique time domain index; a control channel conveying a DL Control Information (DCI) format indicating an adaptation of the first TDD UL-DL configuration to a second TDD UL-DL configuration; and configuration information for resources of a non-zero power Channel State Information Reference Signal (CSI-RS), for resources of a first Channel State Information Interference Measurement (CSI-IM), and for resources of a second CSI-IM wherein, in the first TDD UL-DL configuration, the non-zero power CSI-RS and the first CSI-IM resources are in a DL SF, and the second CSI-IM resources are in an UL SF in the first TDD UL-DL configuration. - View Dependent Claims (15, 16)
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17. A User Equipment (UE) comprising:
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a receiver configured to receive; signaling transmitted from a base station and indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from a base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction can be both from the base station to the UE and from the UE to the base station, and wherein each SF of the ten SFs has a unique time domain index; a control channel transmitted from the base station and conveying a DL Control Information (DCI) format indicating an adaptation of the first TDD UL-DL configuration to a second TDD UL-DL configuration; and one or more processors configured to measure a first quantity in a first set of DL SFs of the second TDD UL-DL configuration to determine a first Channel State Information (CSI) and a second quantity in a second set of DL SFs of the second TDD UL-DL configuration to determine a second CSI, wherein the one or more processors discard a measurement of the second quantity in a DL SF from the second set of DL SFs from the determination of the second CSI if the measurement value is smaller than a second threshold value. - View Dependent Claims (18, 19, 20)
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Specification