LTE-U clear channel assessment operations
First Claim
1. A method for performing clear channel assessment (CCA) in LTE-U, the method comprising:
- monitoring for transmissions in a resource reserved for CCA;
detecting an energy of the transmissions over a shorter duration than an assigned slot in the resource reserved for CCA;
transmitting a beacon in a slot assigned to a wireless entity for CCA based on detecting a clear channel based on the monitoring; and
adapting the beacon transmission and a timing for the monitoring based on detecting the transmissions for a consecutive number of CCA periods, wherein adapting the beacon transmission comprises transmitting the beacon in an auxiliary resource reserved for CCA.
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Abstract
The subject technology provides for performing clear channel assessment (CCA) in LTE-U. Transmissions may be monitored in a resource reserved for CCA. An energy of the transmissions is detected over a shorter duration than an assigned slot in the resource reserved for CCA. A beacon may be transmitted in a slot assigned to a wireless entity for CCA in response to detecting a clear channel based on the monitoring. In another aspect, a beacon transmission for CCA and a timing for the monitoring are adapted in response to detecting the transmissions for a consecutive number of CCA periods. Further, the subject technology provides for adjusting to a maximum power for transmission of a beacon in a slot assigned to a mobile station for CCA in response to detecting a clear channel based on the monitoring.
30 Citations
46 Claims
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1. A method for performing clear channel assessment (CCA) in LTE-U, the method comprising:
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monitoring for transmissions in a resource reserved for CCA; detecting an energy of the transmissions over a shorter duration than an assigned slot in the resource reserved for CCA; transmitting a beacon in a slot assigned to a wireless entity for CCA based on detecting a clear channel based on the monitoring; and adapting the beacon transmission and a timing for the monitoring based on detecting the transmissions for a consecutive number of CCA periods, wherein adapting the beacon transmission comprises transmitting the beacon in an auxiliary resource reserved for CCA. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for performing clear channel assessment (CCA) in LTE-U, the apparatus comprising:
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means for monitoring for transmissions in a resource reserved for CCA; means for detecting an energy of the transmissions over a shorter duration than an assigned slot in the resource reserved for CCA; means for transmitting a beacon in a slot assigned to a wireless entity for CCA based on detecting a clear channel based on the monitoring; and means for adapting the beacon transmission and a timing for the monitoring based on detecting the transmissions for a consecutive number of CCA periods, wherein adapting the beacon transmission comprises transmitting the beacon in an auxiliary resource reserved for CCA. - View Dependent Claims (7, 8, 9, 10)
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11. An apparatus for performing clear channel assessment (CCA) in LTE-U, the apparatus comprising:
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at least one transceiver configured for monitoring transmissions in a resource reserved for CCA; at least one processor configured for detecting an energy of the transmissions over a shorter duration than an assigned slot in the resource reserved for CCA, wherein the at least one transceiver is further configured for transmitting a beacon in a slot assigned to a wireless entity for CCA based on detecting a clear channel based on the monitoring, wherein the at least one processor is further configured for adapting the beacon transmission and a timing for the monitoring based on detecting the transmissions for a consecutive number of CCA periods, and wherein adapting the beacon transmission comprises transmitting the beacon in an auxiliary resource reserved for CCA; and a memory coupled to the at least one processor for storing data. - View Dependent Claims (12, 13, 14, 15)
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16. A non-transitory computer-readable medium storing instructions, the instructions comprising:
one or more instructions that, when executed by at least one computer, cause the at least one computer to; monitor transmissions in a resource reserved for clear channel assessment (CCA); detect an energy of the transmissions over a shorter duration than an assigned slot in the resource reserved for CCA; transmit a beacon in a slot assigned to a wireless entity for CCA based on detecting a clear channel based on the monitoring; and adapt the beacon transmission and a timing for the monitoring based on detecting the transmissions for a consecutive number of CCA periods, wherein adapting the beacon transmission comprises transmitting the beacon in an auxiliary resource reserved for CCA. - View Dependent Claims (17, 18, 19, 20)
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21. A method for an access point performing timing advance in LTE-U, the method comprising:
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receiving, from each of a plurality of mobile stations, at least one message comprising timing information; and determining, using the received timing information, at least one timing advance parameter for channel usage beacon signals (CUBS) transmission and an associated clear channel assessment (CCA) window for at least one mobile station based on reducing a timing difference between the plurality of mobile stations. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for performing timing advance in LTE-U, the apparatus comprising:
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means for receiving, from each of a plurality of mobile stations, at least one message comprising timing information; and means for determining, using the received timing information, at least one timing advance parameter for channel usage beacon signals (CUBS) transmission and an associated CCA window for at least one mobile station based on reducing a timing difference between the plurality of mobile stations. - View Dependent Claims (30, 39, 40, 41, 42, 43)
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31. An apparatus for performing timing advance in LTE-U, the apparatus comprising:
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at least one transceiver configured for receiving, from a plurality of mobile stations, at least one message comprising timing information; at least one processor configured for determining, using the received timing information, at least one timing advance parameter for channel usage beacon signals (CUBS) transmission and an associated CCA window for at least one mobile station based on reducing a timing difference between the plurality of mobile stations; and a memory coupled to the at least one processor for storing data. - View Dependent Claims (32, 33, 44, 45, 46)
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34. A non-transitory computer-readable medium storing instructions, the instructions comprising:
one or more instructions that, when executed by at least one computer, cause the at least one computer to; receive, from each of a plurality of mobile stations, at least one message comprising timing information; and determine, using the received timing information, at least one timing advance parameter for channel usage beacon signals (CUBS) transmission and an associated CCA window for at least one mobile station based on reducing a timing difference between the plurality of mobile stations. - View Dependent Claims (35, 36, 37, 38)
Specification