Channel state information procedure for enhanced component carriers
First Claim
1. A method for wireless communication, comprising:
- receiving one or more downlink reference signals in a variable length downlink transmission time interval (TTI), wherein the variable length downlink TTI comprises a variable number of downlink symbols;
receiving signaling that includes a periodicity and an offset to be used for identifying when a channel state information (CSI) report is to be transmitted;
estimating CSI for at least one of the one or more downlink reference signals;
identifying at least a portion of the estimated CSI for transmission in the CSI report in a variable length uplink TTI; and
determining that an initial symbol for transmission of the CSI report is configured as a downlink symbol, wherein the identifying further comprises identifying a subsequent uplink symbol for transmission of the CSI report as a first available uplink symbol following the initial symbol.
1 Assignment
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Accused Products
Abstract
Techniques are provided for transmitting reference signals and CSI reports within a wireless communications system using variable length downlink or uplink transmission time intervals (TTIs). CSI reference signals and CSI reports may be transmitted at times that accommodate the variable length TTIs. A UE may receive signaling that indicates when a CSI reference signal is to be transmitted, and when a CSI report is to be transmitted to a base station. CSI reporting may be performed periodically using a physical uplink control channel (PUCCH) in designated uplink symbols, may be aperiodic using a physical uplink shared channel (PUSCH), or a combination thereof. A UE may receive signaling indicating periodic CSI reporting, aperiodic CSI reporting, or both. Such signaling may be received, for example, via radio resource control (RRC) signaling or within a downlink or uplink grant.
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Citations
22 Claims
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1. A method for wireless communication, comprising:
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receiving one or more downlink reference signals in a variable length downlink transmission time interval (TTI), wherein the variable length downlink TTI comprises a variable number of downlink symbols; receiving signaling that includes a periodicity and an offset to be used for identifying when a channel state information (CSI) report is to be transmitted; estimating CSI for at least one of the one or more downlink reference signals; identifying at least a portion of the estimated CSI for transmission in the CSI report in a variable length uplink TTI; and determining that an initial symbol for transmission of the CSI report is configured as a downlink symbol, wherein the identifying further comprises identifying a subsequent uplink symbol for transmission of the CSI report as a first available uplink symbol following the initial symbol. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for wireless communication, comprising:
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means for receiving one or more downlink reference signals in a variable length downlink transmission time interval (TTI), wherein the variable length downlink TTI comprises a variable number of downlink symbols; means for receiving signaling that includes a periodicity and an offset to be used for identifying when a channel state information (CSI) report is to be transmitted; means for estimating CSI for at least one of the one or more downlink reference signals; means for identifying at least a portion of the estimated CSI for transmission in the CSI report in a variable length uplink TTI; and means for determining that an initial symbol for transmission of the CSI report is configured as a downlink symbol, wherein the means for identifying is operable to identify a subsequent uplink symbol for transmission of the CSI report as a first available uplink symbol following the initial symbol. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus for wireless communication, comprising:
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a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to cause the apparatus to; receive one or more downlink reference signals in a variable length downlink transmission time interval (TTI), wherein the variable length downlink TTI comprises a variable number of downlink symbols; receive signaling that includes a periodicity and an offset to be used for identifying when a channel state information (CSI) report is to be transmitted; estimate CSI for at least one of the one or more downlink reference signals; identify at least a portion of the estimated CSI for transmission in the CSI report in a variable length uplink TTI; and determine that an initial symbol for transmission of the CSI report is configured as a downlink symbol, wherein the instructions are further executable to identify a subsequent uplink symbol for transmission of the CSI report as a first available uplink symbol following the initial symbol. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A non-transitory computer-readable medium storing computer-executable code for wireless communication, the code executable to:
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receive one or more downlink reference signals in a variable length downlink transmission time interval (TTI), wherein the variable length downlink TTI comprises a variable number of downlink symbols; receive signaling that includes a periodicity and an offset to be used for identifying when a channel state information (CSI) report is to be transmitted; estimate CSI for at least one of the one or more downlink reference signals; identify at least a portion of the estimated CSI for transmission in the CSI report in a variable length uplink TTI; and determine that an initial symbol for transmission of the CSI report is configured as a downlink symbol, wherein the code is further executable to identify a subsequent uplink symbol for transmission of the CSI report as a first available uplink symbol following the initial symbol. - View Dependent Claims (19, 20, 21, 22)
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Specification