CSI feedback in LTE/LTE-advanced systems with unlicensed spectrum
First Claim
Patent Images
1. A method of wireless communication, comprising:
- identifying, by a user equipment (UE), at least one carrier utilizing a contention based access radio frequency spectrum;
detecting a transmission signal indicative of clear channel assessment (CCA) result information for the at least one carrier, wherein the transmission signal indicative of CCA result information includes one or more channel usage reference signals transmitted, by one or more base stations, in response to successful listen before talk (LBT) performed on the at least one carrier by the one or more base stations;
determining whether a reference signal for channel state information measurement is present in a subframe based on the detected transmission signal; and
transmitting, by the UE, a measurement report, wherein the measurement report is based at least in part on the determining the reference signal is present.
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Abstract
Channel state information (CSI) feedback in long term evolution (LTE) and LTE-Advanced (LTE-A) networks including contention-based shared unlicensed spectrum is disclosed in which a user equipment (UE) identifies at least one carrier utilizing a contention based radio frequency spectrum. The UE detects a transmission signal indicative of clear channel assessment (CCA) result information for the carrier and determines whether a reference signal for channel state information measurement is present in a subframe based on the detected transmission signal. The UE would transmit a measurement report based on this presence determination of the reference signal.
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Citations
30 Claims
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1. A method of wireless communication, comprising:
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identifying, by a user equipment (UE), at least one carrier utilizing a contention based access radio frequency spectrum; detecting a transmission signal indicative of clear channel assessment (CCA) result information for the at least one carrier, wherein the transmission signal indicative of CCA result information includes one or more channel usage reference signals transmitted, by one or more base stations, in response to successful listen before talk (LBT) performed on the at least one carrier by the one or more base stations; determining whether a reference signal for channel state information measurement is present in a subframe based on the detected transmission signal; and transmitting, by the UE, a measurement report, wherein the measurement report is based at least in part on the determining the reference signal is present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus configured for wireless communication, comprising:
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means for identifying, by a user equipment (UE), at least one carrier utilizing a contention based access radio frequency spectrum; means for detecting a transmission signal indicative of clear channel assessment (CCA) result information for the at least one carrier, wherein the transmission signal indicative of CCA result information includes one or more channel usage reference signals transmitted, by one or more base stations, in response to successful listen before talk (LBT) performed on the at least one carrier by the one or more base stations; means for determining whether a reference signal for channel state information measurement is present in a subframe based on the detected transmission signal; and means for transmitting, by the UE, a measurement report, wherein the measurement report is based at least in part on the determining the reference signal is present.
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26. A non-transitory computer-readable medium having program code recorded thereon, the program code including:
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program code for causing a computer to identify, by a user equipment (UE), at least one carrier utilizing a contention based access radio frequency spectrum; program code for causing the computer to detect a transmission signal indicative of clear channel assessment (CCA) result information for the at least one carrier, wherein the transmission signal indicative of CCA result information includes one or more channel usage reference signals transmitted, by one or more base stations, in response to successful listen before talk (LBT) performed on the at least one carrier by the one or more base stations; program code for causing the computer to determine whether a reference signal for channel state information measurement is present in a subframe based on the detected transmission signal; and program code for causing the computer to transmit, by the UE, a measurement report, wherein the measurement report is based at least in part on the determining the reference signal is present.
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27. An apparatus configured for wireless communication, the apparatus comprising:
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at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured; to identifying, by a user equipment (UE), at least one carrier utilizing a contention based access radio frequency spectrum; to detect a transmission signal indicative of clear channel assessment (CCA) result information for the at least one carrier, wherein the transmission signal indicative of CCA result information includes one or more channel usage reference signals transmitted, by one or more base stations, in response to successful listen before talk (LBT) performed on the at least on carrier by the one or more base stations; to determine whether a reference signal for channel state information measurement is present in a subframe based on the detected transmission signal; and to transmit, by the UE, a measurement report, wherein the measurement report is based at least in part on the determining the reference signal is present. - View Dependent Claims (28, 29, 30)
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Specification