Apparatus and method for handling uplink listen-before-talk (LBT) failures in new radio (NR) systems operating on unlicensed spectrum

By identifying and managing multiple transmission opportunities in user equipment (UE) and performing associated LBT processes, the detection and processing problems of uplink LBT failures in wireless communications are solved, and higher communication reliability and stability are achieved.

CN114145070BActive Publication Date: 2025-03-25APPLE INC
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Patent Information

Application Number
CN202080032256.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2019-05-01
Filing Date
2020-05-01
Publication Date
2025-03-25
Estimated Expiration
2040-05-01

AI Technical Summary

Technical Problem

The prior art is difficult to effectively detect and handle uplink listen first and then talk (LBT) failures occurring in wireless communications, especially in unlicensed spectrum environments.

Method used

By realizing and managing multiple transmission timings in user equipment (UE), multiple listen first and then talk (LBT) processes associated with each transmission timing are performed and the number of LBT failures is tracked. When an LBT failure exceeds a predetermined threshold within a predetermined time period, a recovery process is performed, including performing a random access process at the MAC level or performing a radio resource control connection at the RRC level.

Benefits of technology

Effectively identify and handle consistent and systematic LBT failures, improving the reliability and stability of wireless communications, especially in unlicensed spectrum environments.

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Abstract

The present invention provides a technique for determining and handling uplink listen-before-talk (LBT) failures, the technique including determining consistent and systematic LBT failures associated with uplink transmissions in a new radio (NR) operating on an unlicensed spectrum. For example, a user equipment (UE) identifies a plurality of transmission opportunities that the UE is to perform over the unlicensed spectrum. The UE also performs a plurality of listen-before-talk (LBT) procedures associated with corresponding transmission opportunities in the plurality of transmission opportunities that the UE is to perform, and tracks the number of LBT failures during the execution of the plurality of LBT procedures, wherein the LBT failure occurs due to a busy channel for the associated LBT procedure or when an LBT backoff is still running from a previous LBT failure. In response to the LBT failure exceeding a predetermined threshold within a predetermined time period, the UE also performs a recovery procedure.
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