Invention Grant
- Patent Title: Close loop listen before talk for NR operation in unlicensed spectrum
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Application No.: US18299893Application Date: 2023-04-13
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Publication No.: US12108446B2Publication Date: 2024-10-01
- Inventor: Thomas Novlan , Arunabha Ghosh , Abdulrauf Hafeez
- Applicant: AT&T Intellectual Property I, L.P.
- Applicant Address: US GA Atlanta
- Assignee: AT&T Intellectual Property I, L.P.
- Current Assignee: AT&T Intellectual Property I, L.P.
- Current Assignee Address: US GA Atlanta
- Main IPC: H04W74/0808
- IPC: H04W74/0808 ; H04W16/14 ; H04W72/21 ; H04W72/23 ; H04W74/00

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 an 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.
Public/Granted literature
- US20230247667A1 CLOSE LOOP LISTEN BEFORE TALK FOR NR OPERATION IN UNLICENSED SPECTRUM Public/Granted day:2023-08-03
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