NR-U Uplink Collision Handling Using Priority-Based LBT
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Solution Overview
Problem
In 5G New Radio License (NR-U) systems, uplink transmissions may collide, leading to prioritization of higher-priority transmissions, which can result in delayed data transmission due to Listen Before Talk (LBT) regulations, affecting transmission success rates.
Innovation Solution
A method to resolve transmission collisions by determining the priority of colliding uplink transmissions and prioritizing Listen Before Talk (LBT) on the higher-priority transmission, with the lower-priority transmission's success determined by the LBT result of the higher-priority transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen Before Talk (LBT) is performed before sending data on unlicensed spectrum, then transmission collision is avoided, but transmission delay increases
Solution Approach 1:
The patent performs Listen Before Talk (LBT) in advance before actual data transmission to detect channel occupancy. By conducting the LBT procedure preliminarily and determining channel availability before committing to transmission, the system avoids collisions while managing delay through proactive channel assessment rather than reactive waiting.
2Reliability
If higher-priority uplink transmission is selected when collisions occur, then transmission reliability is improved, but lower-priority transmission success rate decreases
Solution Approach 1:
The patent dynamically adjusts transmission decisions based on LBT results. When a higher-priority transmission succeeds in LBT, the system dynamically cancels the lower-priority transmission to avoid collision. When the higher-priority transmission fails LBT, the system dynamically allows the lower-priority transmission to proceed. This dynamic adaptation optimizes overall transmission success rates while maintaining reliability for critical communications.
3Reliability
If lower-priority uplink transmission is canceled when higher-priority transmission succeeds in LBT, then collision is avoided, but resource utilization decreases
Solution Approach 1:
The system implements self-service by having the lower-priority transmission automatically adapt its behavior based on the higher-priority transmission's LBT outcome. When the higher-priority transmission succeeds, the lower-priority transmission self-cancels to prevent collision. When the higher-priority transmission fails, the lower-priority transmission self-activates to utilize the available channel, thereby optimizing resource utilization without manual intervention.
Data Source
AI summary
Disclosed are a transmission collision resolving method, relating to the technical field of communications. The method comprises: when two uplink transmissions collide on a time domain, determining, from among the two uplink transmissions, a first uplink transmission with a higher priority and a second uplink transmission with a lower priority; performing first LBT on the first uplink transmission; and deciding, according to a first LBT result of the first uplink transmission, whether to perform the second uplink transmission.