LBT Occasion Provisioning for Uplink Reliability
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Solution Overview
Problem
Wireless communication networks face interference and performance degradation due to transmission uncertainty in unlicensed spectra, particularly in 5G URLLC-U, which requires stringent reliability and low latency, and existing methods struggle to robustly handle interference and resource allocation effectively.
Innovation Solution
Implementing a method that includes provisioning Listen Before Talk (LBT) occasions for user equipment (UEs) before uplink transmissions, allowing them to acknowledge downlink transmissions and adjust their transmissions based on detection results, thereby reducing interference and enhancing reliability without requiring precise detection of base station transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen Before Talk (LBT) procedures are implemented before uplink transmissions, then interference is reduced and reliability is improved, but transmission latency increases and resource overhead increases
Solution Approach 1:
The patent applies preliminary action by implementing LBT procedures before uplink transmissions to detect potential interference in advance. The UE performs LBT in designated LBT occasions prior to transmitting uplink acknowledgments or data, allowing the system to proactively identify and avoid interference conditions rather than reacting after interference occurs, thus improving reliability while managing latency through structured timing.
2Reliability
If Listen Before Talk (LBT) procedures are implemented before uplink transmissions, then interference is reduced and reliability is improved, but resource overhead increases
Solution Approach 1:
The patent applies partial action by implementing LBT procedures selectively rather than continuously. LBT is performed only in specific LBT occasions that are provisioned for the UE, and only before certain uplink transmissions. This partial implementation reduces resource overhead compared to continuous LBT while still providing sufficient interference detection to improve uplink transmission reliability in critical scenarios.
3Reliability
If transmission detection is made more robust to handle uncertainty in unlicensed spectrum, then reliability is improved, but resource overhead increases and complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the detection process into distinct LBT occasions that are provisioned separately for different UEs and different uplink transmission types. Rather than implementing a single complex detection mechanism, the system segments detection into multiple simpler, scheduled LBT occasions, reducing overall system complexity while maintaining robustness through distributed detection opportunities.
4Reliability
If Listen Before Talk (LBT) occasions are provisioned for all UEs before uplink transmissions, then uplink transmission robustness is improved, but resource overhead increases
Solution Approach 1:
The patent applies universality by creating LBT occasions that serve multiple functions: they provide interference detection for uplink acknowledgments, detect potential conflicts with downlink transmissions, and enable robust transmission scheduling. These multi-functional LBT occasions reduce the need for separate detection mechanisms for different transmission types, thereby improving uplink robustness while managing resource overhead through consolidated detection procedures.
Data Source
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AI summary
A method of wireless communication includes receiving, by a user equipment (UE) from a base station, downlink transmissions, and performing, by the UE, a listen before talk (LBT) procedure in an LBT occasion provisioned, by the base station, for the UE immediately prior to an uplink transmission that includes an acknowledgement of a downlink transmission. The method also includes transmitting, by the UE to the base station, the uplink transmission based on results of the LBT procedure. In another aspect, a method of wireless communication includes provisioning, by a base station for all served UEs, an LBT occasion immediately prior to an uplink transmission by the UEs. The uplink transmission includes an acknowledgement of a downlink transmission. The method additionally includes transmitting, by the base station to the UEs, downlink transmissions, and receiving, by the base station, the uplink transmission.