Sidelink COT Determination and LBT Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink transmissions in wireless communication systems, particularly in ensuring successful listen before talk (LBT) procedures and channel occupancy times (COT) to prevent collisions between User Equipments (UEs).
Innovation Solution
The proposed solution involves a method where a first UE performs successful LBT and determines a channel occupancy time (COT). It then checks if a second sidelink transmission by a second UE falls within this COT. Based on this determination, the first UE includes specific information related to the LBT type and cyclic prefix (CP) extension in a sidelink transmission within the COT, which is then shared with the second UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink transmissions are performed without sharing LBT and CP extension information, then the transmission process is simpler, but transmission collisions occur more frequently and network performance deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the first UE provides LBT type and CP extension information to the second UE through sidelink control information. This feedback loop enables the receiving UE to adjust its transmission parameters accordingly, preventing collisions while maintaining coordinated communication between multiple UEs in the network.
Solution Approach 2:
The patent uses sidelink control information as an intermediary carrier to transmit LBT and CP extension parameters between UEs. This intermediary mechanism allows efficient information exchange without requiring direct complex coordination protocols, thereby preventing transmission collisions while managing system complexity through standardized control signaling.
2Productivity
If LBT and CP extension information is shared between UEs, then transmission efficiency improves and collisions are reduced, but the overhead for information exchange increases
Solution Approach 1:
The patent merges the LBT type indication and CP extension information into a single integrated control information structure that is transmitted together with the sidelink grant. This consolidation allows multiple parameters to be exchanged in one operation rather than requiring separate signaling messages, thereby improving transmission efficiency while minimizing the time overhead for information exchange between UEs.
Solution Approach 2:
The patent performs preliminary action by including LBT and CP extension information in the initial sidelink control information transmitted with the grant. This advance provision of transmission parameters allows the receiving UE to prepare its transmission settings in advance, reducing the overall time needed for coordination and enabling faster sidelink communication without requiring additional post-transmission adjustments.
3Reliability
If the first UE determines COT based on LBT success, then channel access is more controlled, but the complexity of determining transmission parameters increases
Solution Approach 1:
The patent applies parameter changes by establishing different COT determination rules based on the LBT outcome and the presence of other UEs in the transmission group. When LBT is successful and other UEs are detected, the first UE determines a shorter COT; when LBT succeeds but no other UEs are present, a longer COT is determined. These parameter adjustments provide reliable channel access control while managing complexity through rule-based decision logic rather than complex calculation algorithms.
Data Source
AI summary
In an example from the perspective of a first User Equipment (UE), in response to performing successful listen before talk (LBT), the first UE determines a channel occupancy time (COT). The first UE determines whether or not a second sidelink transmission, to be performed by a second UE, is within the COT. The first UE determines information, associated with LBT type and/or cyclic prefix (CP) extension, for inclusion in a first sidelink transmission in the COT, wherein whether the information includes first information associated with LBT type and/or CP extension or the information includes second information associated with LBT type and/or CP extension is based on the determination of whether or not the second sidelink transmission is within the COT. The UE transmits, to the second UE, the first sidelink transmission in the COT. The first sidelink transmission includes the information. The second sidelink transmission is associated with the first sidelink transmission.