US 11,083,015 B2 · Close loop listen before talk for NR operation in unlicensed spectrum

Abstract

Various embodiments disclosed herein provide for a closed loop Listen Before Talk (LBT) which is a coexistence mechanism used by wireless technologies such as Wi-Fi, to access unlicensed shared spectrum, such as the ISM UNII bands (5 GHz). The embodiments disclosed herein enable a base station to coordinate the LBT process at both the base station and a receiver in order to avoid hidden node interference where the interfering nodes are outside the sensing range of the transmitting node. The base station device can send a LBT trigger to the receiver to synchronize the clear channel assessments that are performed at each device to determine if there is any activity on the channel. The receiving device can send back a report to the base station device, and if no activity on the channel is detected, the base station device can schedule a transmission on the channel.

Claims20

Dependent claims

A device, comprising:

a processor;
and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
transmitting a first listen before talk trigger to a user equipment, comprising:
in response to a listen before talk duration associated with a first clear channel assessment of a channel to be performed by the user equipment being determined to be less than a length of a slot of control channel, transmitting the first listen before talk trigger to the user equipment in a mini-slot within a duration of a first slot of the control channel in which the first clear channel assessment is to occur, and
in response to the listen before talk duration associated with the first clear channel assessment being determined not to be less than the length of the slot of the control channel, transmitting the first listen before talk trigger to the user equipment in a second slot prior to the first slot.

3 more elements

A non-transitory machine-readable medium, comprising executable instructions that, when executed by a processor of a system, facilitate performance of operations, comprising:

transmitting a first listen before talk trigger to a user equipment, comprising:
in response to a listen before talk duration associated with a first clear channel assessment of a channel to be performed by the user equipment being less than a length of a slot of control channel, transmitting the first listen before talk trigger to the user equipment in a mini-slot within a duration of a first slot of the control channel in which the first clear channel assessment is going to occur, and
in response to the listen before talk duration associated with the first clear channel assessment not being less than the length of the slot of the control channel, transmitting the first listen before talk trigger to the user equipment in a second slot prior to the first slot.

Dependencies are inferred from the claim text.

Close loop listen before talk for NR operation in unlicensed spectrum

Life of this patent

Close loop listen before talk for NR operation in unlicensed spectrum

Life of this patent

Abstract

Claims20