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US 11,540,319 B2Granted
Method and device for performing random access process in unlicensed band
AssigneeLG Electronics Inc.
InventorsJoonkui Ahn, Byounghoon Kim, Suckchel Yang, Yunjung Yi, Seonwook Kim
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Abstract
Provided are a method for performing a random access process in an unlicensed band, and a device using the same. The device receives a random access preamble (RAP) order instructing the transmission of a RAP. The device performs a clear channel assessment (CCA) in an unlicensed cell during an RAP window so as to transmit the RAP when the device succeeds in CCA.
Claims10
A method for performing a random access in an unlicensed band, the method performed by a wireless device and comprising:
- transmitting a random access preamble;
- receiving a random access response as a response to the random access preamble, wherein the random access response includes a timing advance command (TAC) to be applied to a transmission of a scheduled message, an uplink resource allocation assigned to the transmission of the scheduled message and a listen before talk (LBT) parameter to be applied to a LBT operation for the transmission of the scheduled message;
- and
- sensing a channel based on the LBT parameter before transmitting the scheduled message,
- wherein
- based on the LBT parameter being related to a first LBT scheme, the scheduled message is transmitted by the wireless device after the channel is sensed to be idle for a predefined time, and
- based on the LBT parameter being related to a second LBT scheme, the scheduled message is transmitted by the wireless device based on the channel being sensed to be idle for a channel detection time related to a value which is randomly selected by the wireless device.
4 more elements
A device comprising:
- a processor;
- and
- a memory operatively coupled with the processor and storing instructions that when executed by the processor cause the device to:
- transmit a random access preamble;
- and
- receive a random access response as a response to the random access preamble, wherein the random access response includes a timing advance command (TAC) to be applied to a transmission of a scheduled message, an uplink resource allocation assigned to the transmission of the scheduled message and a listen before talk (LBT) parameter to be applied to a LBT operation for the transmission of the scheduled message;
- and
- sense a channel based on the LBT parameter before transmitting the scheduled message,
- wherein
- based on the LBT parameter being related to a first LBT scheme, the scheduled message is transmitted by the device after the channel is sensed to be idle for a predefined time, and
- based on the LBT parameter being related to a second LBT scheme, the scheduled message is transmitted by the device based on the channel being sensed to be idle for a channel detection time related to a value which is randomly selected by the device.
8 more elements
A method for performing a random access in an unlicensed band, the method performed by a base station and comprising:
- receiving, from a wireless device, a random access preamble;
- and
- transmitting, to the wireless device, a random access response as a response to the random access preamble, wherein the random access response includes a timing advance command (TAC) to be applied to a transmission of a scheduled message, an uplink resource allocation assigned to the transmission of the scheduled message and a listen before talk (LBT) parameter to be applied to a LBT operation for the transmission of the scheduled message,
- wherein:
- based on the LBT parameter being related to a first LBT scheme, the base station instructs the wireless device to transmit the scheduled message based on a channel in the unlicensed band being sensed to be idle for a predefined time, and
- based on the LBT parameter being related to a second LBT scheme, the base station instructs the wireless device to transmit the scheduled message base on a channel in the unlicensed band being sensed to be idle for a channel detection time related to a value which is randomly selected by the wireless device.
3 more elements
A base station comprising:
- a processor;
- and
- a memory operatively coupled with the processor and storing instructions that when executed by the processor cause the device to:
- receive, from a wireless device, a random access preamble;
- and
- transmit, to the wireless device, a random access response as a response to the random access preamble, wherein the random access response includes a timing advance command (TAC) to be applied to a transmission of a scheduled message, an uplink resource allocation assigned to the transmission of the scheduled message and a listen before talk (LBT) parameter to be applied to a LBT operation for the transmission of the scheduled message,
- wherein:
- based on the LBT parameter being related to a first LBT scheme, the base station instructs the wireless device to transmit the scheduled message based on a channel in the unlicensed band being sensed to be idle for a predefined time, and
- based on the LBT parameter being related to a second LBT scheme, the base station instructs the wireless device to transmit the scheduled message based on a channel in the unlicensed band being sensed to be idle for a channel detection time related to a value which is randomly selected by the wireless device.
6 more elements
Dependencies are inferred from the claim text.