Sidelink Channel Access for Multi-Consecutive Slot Transmission
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Solution Overview
Problem
There is no suitable transmission mechanism for multi-consecutive slot transmission (MCSt) in sidelink-unlicensed (SL-U) scenarios, including channel access, resource selection, and channel access priority class (CAPC) determination, which affects the reliability of sidelink transmissions.
Innovation Solution
A method for processing channel access that includes continuing or restarting the channel access procedure, performing resource reselection, abandoning transmissions due to failure, and determining CAPC for MCSt, based on shared channel occupancy information and time-domain length considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-consecutive slot transmission (MCSt) is implemented in unlicensed frequency bands, then transmission reliability can be improved by occupying the channel for a longer period, but channel access becomes more complex and difficult due to the need to complete channel access before each transmission slot
Solution Approach 1:
The patent applies preliminary action by performing channel access procedure before the first transmission in the MCSt sequence. Once the channel is successfully accessed and occupied, the terminal can continuously transmit across multiple consecutive slots without repeating the channel access procedure for each slot, thereby simplifying the overall process while maintaining reliability
Solution Approach 2:
The patent implements continuity of useful action by allowing the terminal to occupy the channel for multiple consecutive slots after a single successful channel access. This continuous transmission approach eliminates the need to repeatedly perform channel access procedures, reducing complexity while ensuring reliable transmission over an extended period
2Reliability
If channel access procedure is restarted at every transmission slot, then channel access reliability is maintained, but transmission efficiency and productivity decrease due to repeated access attempts
Solution Approach 1:
The patent performs the channel access procedure in advance before the first transmission slot, establishing channel occupancy that covers multiple consecutive slots. This preliminary action eliminates the need for repeated access attempts at each slot, thereby maintaining reliability while significantly improving transmission efficiency
Solution Approach 2:
By maintaining continuous channel occupancy across multiple consecutive slots after a single successful access, the patent ensures that the useful transmission action continues uninterrupted. This approach preserves channel access reliability while maximizing productivity by eliminating repeated access procedures
3Stability of the object's composition
If channel occupancy time (COT) is extended to cover all MCSt transmissions, then transmission continuity is improved, but the risk of channel being occupied by other technologies increases
Solution Approach 1:
The patent dynamically adjusts the channel occupancy time (COT) to precisely cover only the necessary MCSt transmissions. Rather than using a fixed or overly extended COT, the system adapts the occupancy duration to match the actual transmission requirements, thereby maintaining transmission continuity while minimizing the window for other technologies to occupy the channel
Solution Approach 2:
The patent changes the COT parameter to optimally fit the MCSt transmission sequence. By adjusting the COT duration and timing parameters to match the exact needs of the multi-slot transmission, the system ensures continuous transmission coverage while reducing unnecessary channel occupation that could be taken by other technologies
4Adaptability or versatility
If resource reselection is performed frequently to adapt to channel conditions, then transmission adaptability is improved, but system complexity and processing overhead increase
Solution Approach 1:
The patent performs resource selection in advance for all MCSt transmissions, determining the resource allocation for the entire multi-slot sequence beforehand. This preliminary resource selection reduces the need for frequent reselection operations, thereby maintaining adaptability while reducing system complexity and processing overhead
Solution Approach 2:
The patent applies a universal resource selection approach that covers multiple consecutive slots with a single resource allocation decision. This multi-functional resource selection mechanism allows the same resource to be used across several slots, reducing the frequency of reselection operations while maintaining adaptability to channel conditions
Data Source
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AI summary
The disclosure provides a method for processing channel access procedure and apparatus, a method for resource selection and apparatus, and a terminal. The channel access method is applied to a terminal, and includes: in a case that channel access is not completed before a first transmission, performing at least one of the following: continuing the uncompleted channel access procedure; restarting the channel access procedure at a target moment; in response to that the minimum value of the channel access time is determined to be less than or equal to a preset time interval, restarting the channel access procedure at the target moment; performing resource reselection; abandoning transmissions, which cannot be transmitted due to channel access failure, in MCSt; and abandoning the first transmission and subsequent transmissions; wherein the first transmission is any one of the MCSt.