CARRIER SENSE ADAPTIVE TRANSMISSION (CSAT) IN UNLICENSED SPECTRUM
First Claim
1. A method of Carrier Sense Adaptive Transmission (CSAT) for reducing interference between Radio Access Technologies (RATs), comprising:
- receiving signals via a resource, wherein a first RAT is used to receive the signals;
identifying a utilization of the resource that is associated with the first RAT, wherein the identification is based on the received signals;
setting one or more cycling parameters of a first Time Division Multiplexing (TDM) communication pattern defining activated and deactivated periods of transmission on a first frequency for a second RAT sharing the resource, wherein the setting is based on the identified utilization of the resource;
setting one or more cycling parameters of a second TDM communication pattern defining activated and deactivated periods of transmission on a second frequency for the second RAT, wherein the setting is based on the identified utilization of the resource, and wherein the first TDM communication pattern and the second TDM communication pattern are staggered in time with respect to an overlap in their activated and deactivated periods; and
cycling operation of the second RAT between activated and deactivated periods of transmission over the resource on the first and second frequencies in accordance with the first and second TDM communication patterns.
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Abstract
Systems and methods for Carrier Sense Adaptive Transmission (CSAT) and related operations in unlicensed spectrum are disclosed to reduce interference between co-existing Radio Access Technologies (RATs). The parameters for a given CSAT communication scheme may be adapted dynamically based on received signals from a transceiver for a native RAT to be protected and an identification of how that RAT is utilizing a shared resource such as an unlicensed band. Other operations such as Discontinuous Reception (DRX) may be aligned with a CSAT Time Division Multiplexed (TDM) communication pattern by way of a DRX broadcast/multicast message. Different TDM communication patterns may be staggered in time across different frequencies. Channel selection for a co-existing RAT may also be configured to afford further protection to native RATs by preferring operation on secondary channels as opposed to primary channels.
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Citations
30 Claims
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1. A method of Carrier Sense Adaptive Transmission (CSAT) for reducing interference between Radio Access Technologies (RATs), comprising:
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receiving signals via a resource, wherein a first RAT is used to receive the signals; identifying a utilization of the resource that is associated with the first RAT, wherein the identification is based on the received signals; setting one or more cycling parameters of a first Time Division Multiplexing (TDM) communication pattern defining activated and deactivated periods of transmission on a first frequency for a second RAT sharing the resource, wherein the setting is based on the identified utilization of the resource; setting one or more cycling parameters of a second TDM communication pattern defining activated and deactivated periods of transmission on a second frequency for the second RAT, wherein the setting is based on the identified utilization of the resource, and wherein the first TDM communication pattern and the second TDM communication pattern are staggered in time with respect to an overlap in their activated and deactivated periods; and cycling operation of the second RAT between activated and deactivated periods of transmission over the resource on the first and second frequencies in accordance with the first and second TDM communication patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for Carrier Sense Adaptive Transmission (CSAT) for reducing interference between Radio Access Technologies (RATs), comprising:
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a first transceiver configured to receive signals via a resource, wherein the first transceiver operates in accordance with a first RAT to receive the signals; a processor configured to; identify a utilization of the resource that is associated with the first RAT, wherein the identification is based on the received signals, set one or more cycling parameters of a first Time Division Multiplexing (TDM) communication pattern defining activated and deactivated periods of transmission on a first frequency for a second RAT sharing the resource, wherein the setting is based on the identified utilization of the resource, set one or more cycling parameters of a second TDM communication pattern defining activated and deactivated periods of transmission on a second frequency for the second RAT, wherein the setting is based on the identified utilization of the resource, and wherein the first TDM communication pattern and the second TDM communication pattern are staggered in time with respect to an overlap in their activated and deactivated periods, and control cycling of operation of the second RAT between activated and deactivated periods of transmission over the resource on the first and second frequencies in accordance with the first and second TDM communication patterns; and memory coupled to the processor for storing related data and instructions. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of channel selection among a plurality of frequencies for reducing interference between Radio Access Technologies (RATs), comprising:
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receiving signals via a resource, wherein a first RAT is used to receive the signals; identifying a utilization of the resource that is associated with the first RAT, wherein the identification is based on the received signals; selecting a first frequency from the plurality of frequencies for communication over the resource by a second RAT in response to the identified utilization of the resource being below a clean channel threshold on the first frequency; and selecting a second frequency from the plurality of frequencies for communication over the resource by the second RAT in response to the identified utilization of the resource being above the clean channel threshold on each of the plurality of frequencies, wherein a frequency associated with a secondary channel of the first RAT is selected as the second frequency if one or more secondary channels are identified as operating on the resource, and wherein a frequency associated with a primary channel of the first RAT is selected as the second frequency if no secondary channels are identified as operating on the resource. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for channel selection among a plurality of frequencies for reducing interference between Radio Access Technologies (RATs), comprising:
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a first transceiver configured to receive signals via a resource, wherein the first transceiver operates in accordance with a first RAT to receive the signals; a processor configured to; identify a utilization of the resource that is associated with the first RAT, wherein the identification is based on the received signals; select a first frequency from the plurality of frequencies for communication over the resource by a second RAT in response to the identified utilization of the resource being below a clean channel threshold on the first frequency; and select a second frequency from the plurality of frequencies for communication over the resource by the second RAT in response to the identified utilization of the resource being above the clean channel threshold on each of the plurality of frequencies, wherein a frequency associated with a secondary channel of the first RAT is selected as the second frequency if one or more secondary channels are identified as operating on the resource, and wherein a frequency associated with a primary channel of the first RAT is selected as the second frequency if no secondary channels are identified as operating on the resource; and memory coupled to the processor for storing related data and instructions. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification