Sidelink Resource Selection Using Receiver Feedback and Beam Sensing
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Solution Overview
Problem
Existing sidelink communication technologies face challenges in efficiently and cost-effectively allocating radio resources due to the hidden terminal problem, inaccurate interference assessment, and lack of support for directional antennas and beamforming, which affect the reliability and efficiency of V2X services, particularly in enhanced 5G eV2X scenarios.
Innovation Solution
A two-way handshake procedure involving a Scheduling Request (SR) and Scheduling Grant (SG) message exchange between transmitting and receiving sidelink communication devices to facilitate accurate interference assessment and resource allocation, incorporating preference and exclusion lists based on directional sensing and beamforming configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UE autonomous resource selection is used, then device complexity is reduced and ease of operation is improved, but measurement precision and interference assessment accuracy deteriorate due to hidden terminal problem
Solution Approach 1:
The patent implements a feedback mechanism where the receiving UE sends back resource selection information and interference measurements to the transmitting UE. This feedback loop enables the transmitting UE to adjust its resource selection based on actual received signals and interference conditions, thereby improving measurement precision while maintaining autonomous operation.
Solution Approach 2:
The patent introduces an intermediary mechanism where the receiving UE acts as a mediator by providing interference measurements and resource feedback information. This intermediary role allows the transmitting UE to obtain accurate interference assessment without directly measuring all interference conditions, resolving the hidden terminal problem.
2Device complexity
If distributed autonomous resource selection is used, then device complexity is reduced, but reliability deteriorates due to inaccurate interference assessment and hidden terminal problem
Solution Approach 1:
The feedback mechanism enables the transmitting UE to receive actual interference measurements and resource selection outcomes from the receiving UE. This feedback allows for reliability improvement by adjusting resource selection based on actual communication conditions, while maintaining the simplicity of distributed autonomous operation.
Solution Approach 2:
The patent implements preliminary actions by having UEs perform sensing and resource evaluation before actual data transmission. The receiving UE evaluates candidate resources and provides feedback in advance, allowing the transmitting UE to select optimal resources beforehand, thereby improving reliability without increasing operational complexity.
3Ease of operation
If omnidirectional sensing is used, then ease of operation is improved, but spectral efficiency deteriorates due to inability to support directional antennas and beamforming
Solution Approach 1:
The patent applies local quality by enabling directional sensing and beamforming capabilities specific to the communication link between transmitting and receiving UEs. Instead of omnidirectional sensing, the system uses localized directional detection to assess interference and select resources, thereby improving spectral efficiency while maintaining operational simplicity through link-specific optimization.
Data Source
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AI summary
The invention relates to a sidelink communication device (i, 301) comprising a transceiver (303) being configured to communicate with at least one neighboring sidelink communication device (j, 331) using one or more radio resources of a plurality of radio resources, in particular Physical Sidelink Shared Channel (PSSCH) radio resources, wherein the transceiver (303) is configured to: transmit to the at least one neighboring sidelink communication device (j, 331) a first message for requesting one or more radio resources for transmission of sidelink data to the at least one neighboring sidelink communication device (j, 331); and/or receive from the at least one neighboring sidelink communication device (j, 331) a second message indicating one or more radio resources selected by the at least one neighboring sidelink communication device (j, 331) for transmission of sidelink data by the sidelink communication device (i, 301) to the at least one neighboring sidelink communication device (j, 331).