Sidelink COT Sharing Using Energy Detection Threshold Indicators
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Solution Overview
Problem
In wireless communication systems using unlicensed spectrum, there is a need to improve methods for sharing channel occupancy time (COT) among user equipment (UEs) for sidelink transmissions while ensuring fair coexistence with other wireless systems, particularly in scenarios where channel access procedures like LBT are required.
Innovation Solution
A method where a transmitting UE determines an energy detection threshold for initiating a COT and shares this threshold with receiving UEs through indicators, allowing them to perform Type-2 channel access procedures, thereby ensuring fair coexistence and efficient COT sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Tx UE initiates a COT for sidelink transmission on unlicensed spectrum, then the Tx UE can perform sidelink transmission to Rx UEs, but the remaining time domain resources in the COT cannot be efficiently shared with Rx UEs without proper indication mechanisms
Solution Approach 1:
The patent applies feedback by having the Tx UE transmit an indicator containing energy detection threshold information to Rx UEs within the COT. This feedback mechanism enables Rx UEs to understand the energy detection parameters used during COT initiation, allowing them to perform Type-2 channel access procedures appropriately and efficiently utilize the remaining time domain resources for sidelink transmission.
2Adaptability or versatility
If Rx UEs perform Type-2 channel access procedure within a COT initiated by Tx UE, then COT sharing is enabled, but Rx UEs need to know the energy detection threshold used by Tx UE to ensure fair coexistence
Solution Approach 1:
The patent uses an intermediary approach by introducing an indicator as a message carrier that transmits energy detection threshold information from the Tx UE to Rx UEs. This intermediary mechanism ensures that Rx UEs receive the necessary parameter information to perform Type-2 channel access procedures correctly, enabling adaptable COT sharing while maintaining fair coexistence with other wireless systems.
3Device complexity
If energy detection threshold is not shared between UEs, then COT sharing can be simplified, but channel access success probability and coexistence fairness deteriorate
Solution Approach 1:
The patent applies preliminary action by having the Tx UE transmit the energy detection threshold indicator to Rx UEs before Rx UEs need to perform their Type-2 channel access procedures. This advance information sharing enables Rx UEs to prepare appropriately and execute channel access procedures with higher success probability, while the overall procedure remains relatively simple by using standardized indicator formats.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for sharing channel occupancy time for sidelink transmission. According to an embodiment of the present disclosure, a method performed by a first user equipment (UE) for wireless communication may include: determining an energy detection threshold for performing a Type-1 channel access procedure; performing the Type-1 channel access procedure based on the energy detection threshold; initiating a channel occupancy time (COT) in response to the Type-1 channel access procedure being successful; and transmitting an indicator for indicating the energy detection threshold within the COT.