CSI feedback in LTE/LTE-advanced systems with unlicensed spectrum
First Claim
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1. A method of wireless communication, comprising:
- obtaining, by a base station, clear channel assessment (CCA) result information for a plurality of neighboring base stations, wherein the CCA result information is estimated, by at least one of the base station or one or more user equipments (UEs) served by the base station, by detecting channel usage beacon signals (CUBS) transmitted from the plurality of neighboring base stations in response to obtaining, by the plurality of neighboring base stations, CCA clearance, wherein a CUBS is transmitted on a channel immediately upon a successful CCA being performed on the channel;
generating, by the base station, control signaling for the one or more UEs served by the base station, wherein the control signaling is generated to accommodate interference attributable to the neighboring base stations and is based, at least in part, on the CCA result information; and
transmitting the control signaling to the one or more UEs.
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Abstract
Channel state information (CSI) feedback in long term evolution (LTE) and LTE-Advanced (LTE-A) networks including unlicensed spectrum is disclosed in which a base station obtains clear channel assessment (CCA) result information from neighboring base stations, either directly or by determining such results from measurement or reports from user equipment (UE) served by the base station. The base station may then generate control signaling based on the CCA result information for transmission to the one or more UEs served by the base station.
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Citations
28 Claims
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1. A method of wireless communication, comprising:
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obtaining, by a base station, clear channel assessment (CCA) result information for a plurality of neighboring base stations, wherein the CCA result information is estimated, by at least one of the base station or one or more user equipments (UEs) served by the base station, by detecting channel usage beacon signals (CUBS) transmitted from the plurality of neighboring base stations in response to obtaining, by the plurality of neighboring base stations, CCA clearance, wherein a CUBS is transmitted on a channel immediately upon a successful CCA being performed on the channel; generating, by the base station, control signaling for the one or more UEs served by the base station, wherein the control signaling is generated to accommodate interference attributable to the neighboring base stations and is based, at least in part, on the CCA result information; and transmitting the control signaling to the one or more UEs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11)
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9. A method of wireless communication, comprising:
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detecting, by a user equipment (UE), transmission signals indicative of clear channel assessment (CCA) result information for a plurality of neighboring base stations, wherein the transmission signals indicative of CCA result information include channel usage beacon signals (CUBS) transmitted from the plurality of neighboring base stations in response to obtaining, by the plurality of neighboring base stations, CCA clearance, wherein a CUBS is transmitted on a channel immediately upon a successful CCA being performed on the channel; determining, by the UE, CCA result information estimate for the plurality of neighboring base stations based on the transmission signals indicative of CCA result information; and transmitting, by the UE, a measurement report to a serving base station, wherein the measurement report includes the CCA result information estimate. - View Dependent Claims (10, 12)
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13. A computer program product for wireless communications in a wireless network, comprising:
a non-transitory computer-readable medium having program code recorded thereon, the program code including; program code that, when executed on a computer, causes the computer to obtain, by a base station, clear channel assessment (CCA) result information for a plurality of neighboring base stations, wherein the CCA result information is estimated, by at least one of the base station or one or more user equipments (UEs) served by the base station, by detecting channel usage beacon signals (CUBS) transmitted from the plurality of neighboring base stations in response to obtaining, by the plurality of neighboring base stations, CCA clearance, wherein a CUBS is transmitted on a channel immediately upon a successful CCA being performed on the channel; program code that, when executed on the computer, causes the computer to generate, by the base station, control signaling for the one or more UEs served by the base station, wherein the control signaling is generated to accommodate interference attributable to the neighboring base stations and is based, at least in part, on the CCA result information; and program code that, when executed on the computer, causes the computer to transmit the control signaling to the one or more UEs. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. 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 obtain, by a base station, clear channel assessment (CCA) result information for a plurality of neighboring base stations, wherein the CCA result information is estimated, by at least one of the base station or one or more user equipments (UEs) served by the base station, by detecting channel usage beacon signals (CUBS) transmitted from the plurality of neighboring base stations in response to obtaining, by the plurality of neighboring base stations, CCA clearance, wherein a CUBS is transmitted on a channel immediately upon a successful CCA being performed on the channel; to generate, by the base station, control signaling for the one or more UEs served by the base station, wherein the control signaling is generated to accommodate interference attributable to the neighboring base stations and is based, at least in part, on the CCA result information; and to transmit the control signaling to the one or more UEs. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification