UE MAC LBT Failure Detection With Threshold Counter Reset
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Solution Overview
Problem
There is a need for an improved mechanism for a UE to handle Listen-Before-Talk (LBT) failure in the physical layer of next-generation wireless communication networks, particularly in unlicensed spectrum operations.
Innovation Solution
A UE is equipped with a Medium Access Control (MAC) entity that receives LBT failure indications, increments an LBT failure counter when such indications are received, determines an LBT failure event when the counter reaches a threshold, and resets the counter after a specified time period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT failure detection mechanism is implemented, then reliability of uplink transmission is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by proactively detecting LBT failures through a counter mechanism before they impact uplink transmission reliability. The MAC entity monitors LBT failure indications and increments a counter in advance, allowing the system to predict and prepare for potential transmission failures rather than reacting after damage occurs. This early detection approach improves reliability by enabling timely recovery procedures while managing complexity through a straightforward counter-based methodology.
2Productivity
If LBT failure counter threshold mechanism is used, then productivity of failure detection is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by utilizing a configurable threshold parameter that can be adjusted to balance detection speed and precision requirements. The MAC entity compares the LBT failure counter against this threshold parameter to determine when failure conditions are met. By making the threshold a configurable parameter rather than a fixed value, the system can optimize for either faster detection (lower threshold) or higher precision (higher threshold) based on specific operational requirements, thus resolving the contradiction between productivity and measurement precision.
Data Source
AI summary
A method for LBT failure detection performed by a UE is provided. The method includes: receiving, by a MAC entity of the UE, an LBT failure indication from a lower layer for all UL transmissions; increasing an LBT failure counter when the MAC entity receives the LBT failure indication; determining an LBT failure event occurs when the LBT failure counter is greater than or equal to a threshold; and resetting the LBT failure counter after the MAC entity has not received the LBT failure indication for a time period.