Channel clearance techniques using shared radio frequency spectrum band
First Claim
1. A method for wireless communication, comprising:
- performing, by a wireless device, a listen-before-talk (LBT) procedure;
receiving a pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission;
transmitting a channel clearance signal based at least in part on the LBT procedure;
monitoring channel clearance signals and their power levels for one or more channels;
estimating a future interference level using a duration indicated in the monitored channel clearance signals and their power levels; and
transmitting a feedback communication responsive to the pre-grant transmission and the estimated future interference level, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available based on the LBT procedure.
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Accused Products
Abstract
Channel clearance using a shared radio frequency spectrum band may be performed for both a base station and a user equipment (UE). A base station may perform a listen before talk (LBT) procedure and verify one or more channels in a shared radio frequency spectrum band are available for transmissions and, if the LBT procedure is successful, transmit a pre-grant transmission to one or more UEs. The UEs may perform an LBT procedure for channel(s) indicated in the pre-grant transmission. If the UE LBT procedure passes, the UE may transmit a channel clearance signal, and may transmit a feedback communication responsive to the pre-grant transmission. The feedback communication may indicate, for example, the pre-grant transmission was received and which of the one or more channels are available based on the LBT procedure. The base station may receive the feedback communication and initiate transmissions to the UE.
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Citations
29 Claims
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1. A method for wireless communication, comprising:
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performing, by a wireless device, a listen-before-talk (LBT) procedure; receiving a pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission; transmitting a channel clearance signal based at least in part on the LBT procedure; monitoring channel clearance signals and their power levels for one or more channels; estimating a future interference level using a duration indicated in the monitored channel clearance signals and their power levels; and transmitting a feedback communication responsive to the pre-grant transmission and the estimated future interference level, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available based on the LBT procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for wireless communication, comprising:
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transmitting a channel clearance signal having a length indication based at least in part on a pre-grant transmission and acknowledgment length and a radio frame transmission length; transmitting the pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission; and receiving a feedback communication responsive to the pre-grant transmission and a future interference level estimated by a wireless device, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available for the downlink transmission. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An apparatus for communication at a wireless device, comprising:
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a processor; memory in communication with the processor; and instructions stored in the memory;
wherein the instructions are executable by the processor to;perform, by a wireless device, a listen-before-talk (LBT) procedure; receive a pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission; transmit a channel clearance signal based at least in part on the LBT procedure; monitor channel clearance signals and their power levels for one or more channels; estimate a future interference level using a duration indicated in the monitored channel clearance signals and their power levels; and transmit a feedback communication responsive to the pre-grant transmission and the estimated future interference level, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available based on the LBT procedure.
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29. An apparatus for communication at a wireless device, comprising:
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a processor; memory in communication with the processor; and instructions stored in the memory;
wherein the instructions are executable by the processor to;transmit a channel clearance signal having a length indication based at least in part on a pre-grant transmission and acknowledgment length and a radio frame transmission length; transmit the pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission; and receive a feedback communication responsive to the pre-grant transmission and a future interference level estimated by a wireless device, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available for the downlink transmission.
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Specification