Sidelink Positioning Transmission with Flexible LBT Start Points
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Solution Overview
Problem
In sidelink communication over unlicensed spectrum, terminals often fail to complete listen-before-talk (LBT) before the scheduled transmission starting point, leading to missed transmission opportunities.
Innovation Solution
A sidelink communication method that allows terminals to obtain transmission resources with multiple available starting points within a slot, enabling transmission to commence from the first or second OFDM symbol after successful LBT, thereby increasing transmission opportunities for sidelink positioning-related information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals perform listen-before-talk (LBT) before accessing the channel on unlicensed spectrum, then channel access reliability is improved, but transmission opportunity is lost when LBT cannot be completed before the scheduled transmission starting point
Solution Approach 1:
The patent introduces multiple dynamic transmission starting points within a slot (first, second, and third starting points) instead of a fixed starting point. The terminal can flexibly select which starting point to use based on whether LBT is completed in time, transforming a static transmission structure into a dynamic one that adapts to channel access conditions.
Solution Approach 2:
The patent performs preliminary action by conducting LBT before the first transmission starting point. If LBT succeeds before the first starting point, the terminal can transmit at the first starting point. If LBT is not completed by then, the terminal can still transmit at subsequent starting points, effectively preparing multiple fallback options in advance.
2Ease of operation
If terminals use a fixed transmission starting point in a slot, then transmission scheduling is simplified, but transmission flexibility is reduced when LBT completion time varies
Solution Approach 1:
The patent transforms the fixed transmission starting point into multiple dynamic starting points (first, second, third) within the slot. Each starting point corresponds to different OFDM symbols, allowing the terminal to adapt its transmission start time based on LBT completion, thus maintaining scheduling simplicity while enhancing flexibility.
Solution Approach 2:
The patent segments the transmission opportunity within a slot by defining multiple discrete starting points at different OFDM symbols. This segmentation allows the terminal to choose the appropriate starting point based on channel access timing, effectively dividing a single transmission opportunity into multiple selectable options.
3Reliability
If terminals wait for LBT completion before transmitting, then channel access compliance is improved, but transmission delay increases when LBT takes longer than expected
Solution Approach 1:
The patent performs LBT as a preliminary action before the first transmission starting point. By completing channel sensing early, the terminal maximizes the chance of successful transmission at the first starting point. If LBT completes later, the terminal can still transmit at subsequent starting points, reducing the impact of LBT duration on overall transmission delay.
Solution Approach 2:
The patent introduces dynamic transmission starting points that adjust based on LBT completion time. Instead of waiting for a fixed starting point regardless of LBT status, the terminal can dynamically select from multiple starting points, thereby reducing transmission delay while maintaining channel access compliance.
Data Source
AI summary
A sidelink communication method and apparatus are provided. The method includes: a first terminal obtaining a transmission resource for sidelink positioning-related information based on a transmission resource for first sidelink information. The transmission resource for the sidelink positioning-related information include one or more available transmission starting points.