Sidelink Resource Selection via Transmitter Sensing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently selecting resources for sidelink communications, particularly due to interference caused by UEs unable to detect control information from other UEs, leading to potential sidelink transmission conflicts.
Innovation Solution
Implementing resource selection methods based on sidelink receiver and transmitter sensing, where UEs monitor for sidelink messages and reserve resources, allowing them to transmit data over available non-conflicting resources, indicated through sidelink feedback channels, control channels, or data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If UEs transmit sidelink messages without comprehensive sensing, then transmission simplicity is maintained, but interference and transmission conflicts increase
Solution Approach 1:
The patent implements preliminary sensing actions where UEs monitor and detect sidelink control information and data messages from other UEs before selecting resources for transmission. This advance detection allows UEs to identify reserved resources and avoid conflicts, resolving the contradiction by performing resource selection based on prior sensing results rather than random selection.
Solution Approach 2:
The patent employs feedback mechanisms where receiving UEs send acknowledgments and resource reservation information back to transmitting UEs. This feedback loop enables transmitting UEs to adjust their resource selection based on received feedback, reducing interference while maintaining manageable sensing complexity through iterative refinement of resource choices.
2Productivity
If UEs use directional beams for sidelink communication, then spectral efficiency is improved, but detection of control information from other directions is lost
Solution Approach 1:
The patent segments the sensing process into multiple directional measurements. Instead of using a single omnidirectional or fixed directional beam, UEs perform sensing across multiple beam directions sequentially or simultaneously. This segmentation allows the system to maintain high spectral efficiency through focused directional transmission while still detecting control information from other directions by dividing the sensing space into discrete angular segments.
Solution Approach 2:
The patent adds a spatial dimension to the sensing process by implementing beam sweeping across multiple angular directions. Rather than relying on a single transmission dimension, the system measures channel conditions and detects control information across a multi-dimensional beam space. This dimensional expansion allows directional high-gain transmission while maintaining awareness of resources in other spatial directions.
3Reliability
If UEs reserve resources for future transmissions, then transmission reliability is improved, but resource flexibility and adaptability decrease
Solution Approach 1:
The patent implements dynamic resource reservation where UEs can adjust their reserved resources based on changing channel conditions and traffic requirements. Rather than fixed long-term reservations, the system allows periodic renewal and modification of resource reservations, enabling UEs to maintain reliable scheduled transmissions while adapting to new conditions by releasing or reallocating reserved resources when no longer needed.
Solution Approach 2:
The patent employs periodic resource reservation intervals where UEs re-evaluate and renew their resource reservations at scheduled intervals. This periodic approach provides the reliability of predetermined resources for ongoing transmissions while maintaining flexibility by allowing UEs to reassess resource needs and adjust reservations periodically, preventing permanent commitment to suboptimal resource allocations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may monitor for sidelink messages among multiple UEs using transmission-side sensing. The first UE may monitor for sidelink messages over a transmit beam selected for transmitting data from the first UE. The first UE may receive, from a second UE, a sidelink message including an indication of resources reserved for sidelink transmissions to the second UE. Based on the indication, the first UE may select available resources over which to transmit data. The first UE may receive the sidelink message over a sidelink feedback channel.