Sidelink UE Starting Point Selection for COT Contention
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Solution Overview
Problem
In wireless communication networks, particularly in sidelink communications, multiple user equipment devices (UEs) often contend for channel occupancy time (COT) simultaneously, leading to congestion and increased likelihood of listen-before-talk (LBT) failures, as well as potential interference between UEs.
Innovation Solution
The proposed solution involves allowing sidelink UEs to select a starting point from a plurality of starting points for initiating a sidelink communication, thereby reducing congestion by enabling UEs to perform LBT and start transmissions at different times. This approach includes determining a first starting point, performing a CAT4 LBT to contend for the COT, and transmitting a sidelink communication beginning at the selected starting point if the LBT is successful.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple UEs contend for channel occupancy time simultaneously at the same starting point, then channel access is achieved, but congestion and LBT failure rate increase
Solution Approach 1:
The patent segments the channel access process by dividing the starting points into multiple distinct time instances. Instead of all UEs attempting to access the channel at the same starting point, UEs are distributed across multiple starting points (first starting point, second starting point, etc.), which segments the congestion and reduces the number of simultaneous LBT attempts at each point, thereby improving LBT success rate.
2Productivity
If multiple UEs start transmissions at the same time, then channel utilization is maximized, but interference between UEs increases
Solution Approach 1:
The patent implements periodic action by establishing multiple starting points that are distributed in time. UEs perform LBT and initiate transmissions at different periodic intervals rather than simultaneously. This temporal distribution maintains channel utilization while reducing interference by ensuring that not all UEs transmit at the exact same moment, thereby resolving the contradiction between productivity and harmful interference.
3Stability of the object's composition
If all UEs perform LBT at the same starting point, then synchronization is maintained, but the time required for successful transmission increases
Solution Approach 1:
The patent applies dynamics by making the starting point selection flexible rather than fixed. UEs can dynamically choose from multiple starting points based on their specific needs and channel conditions. This dynamic approach allows UEs to find less congested starting points, reducing transmission delay while maintaining overall system synchronization through the structured framework of predefined starting points.
Data Source
AI summary
Wireless communications systems and methods related to communicating a sidelink communication among sidelink user equipment devices (UEs) are provided. A UE may determine a first starting point from a plurality of starting points and perform a listen-before-talk (LBT) to contend for a channel occupancy time (COT) beginning at the first starting point. The UE may transmit, during the COT based on the LBT, a sidelink communication beginning at the first starting point.