Sidelink Channel Access Priority for Reliable Multi-Slot Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting signals, particularly in sidelink communications requiring high reliability and low latency, such as in vehicle-to-everything (V2X) scenarios, due to inadequate channel access methods.
Innovation Solution
A user equipment (UE) determines channel access priority class (CAPC) values for each sidelink (SL) transmission within a slot and performs a Type 1 channel access procedure based on the highest CAPC value among multiple SL transmissions, associating CAPC values with contention window parameters to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple SL transmissions are performed within a slot without priority-based channel access, then channel utilization is improved, but transmission reliability deteriorates due to random access conflicts
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting channel access priority class (CAPC) values based on traffic priority. Different SL transmissions are assigned different CAPC parameters (e.g., CAPC 1 for high priority, CAPC 4 for low priority), which changes the channel access behavior and contention window sizes, thereby resolving the contradiction between channel utilization and transmission reliability.
Solution Approach 2:
The patent implements dynamics by making the channel access priority class configurable and adjustable based on traffic conditions. The base station can dynamically assign different CAPC values to different SL transmissions within a slot, allowing the system to adapt to varying traffic priorities and channel conditions, thus improving both reliability and utilization.
2Reliability
If channel access priority class is configured for each SL transmission, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring channel access priority class values at the base station before SL transmissions occur. The base station determines and assigns appropriate CAPC values to different SL transmissions in advance, which simplifies the UE operations as they only need to follow the pre-assigned priority classes, thereby improving reliability without significantly increasing device complexity.
3Ease of operation
If Type 1 channel access procedure is used for all SL transmissions, then ease of operation is maintained, but transmission efficiency deteriorates due to lack of priority differentiation
Solution Approach 1:
The patent applies local quality by differentiating channel access parameters for different SL transmissions based on their specific priority requirements. Instead of applying a uniform channel access procedure to all transmissions, the system assigns different CAPC values locally to each SL transmission type (e.g., different priorities for different traffic types), thereby improving transmission efficiency while maintaining operational simplicity through standardized procedures.
Data Source
AI summary
The present invention relates to a wireless communication system and, specifically, to a method and a wireless device therefor, the method comprising the steps of: for a plurality of SL transmissions within a slot, determining a CAPC value per each SL transmission; and for transmitting the plurality of SL transmissions in the slot, performing a Type 1 CAP on the basis of the highest CAPC value among a plurality of CAPC values associated with the plurality of SL transmissions.