Sidelink Resource Selection Using Multi-Beam Control Signaling
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Solution Overview
Problem
In sidelink communications, particularly in millimeter-wave frequency bands, beamformed transmissions can lead to collision interferences due to UEs selecting the same radio resources for their transmissions, especially when the beam directions are similar, resulting in interference among vehicles in vehicle-to-everything (V2X) services.
Innovation Solution
The solution involves transmitting a first sidelink control signal and data signal in a specific beam direction while simultaneously transmitting a second sidelink control signal in a different beam direction, which may include a dummy data signal, to avoid resource collisions by ensuring UEs sense and select appropriate resources without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UEs select radio resources autonomously from a configured resource pool for sidelink transmissions, then resource allocation flexibility and autonomy are improved, but collision interferences occur when multiple UEs select the same resources especially in similar beam directions
Solution Approach 1:
The patent introduces beam direction as an additional dimension for resource differentiation. UEs transmit sidelink control signals and data signals in specific beam directions, and resource selection is extended to consider spatial dimension (beam direction) alongside traditional time-frequency resources. This multi-dimensional resource allocation approach allows UEs to select resources that are not only different in time-frequency domain but also in spatial domain, thereby reducing collision interference while maintaining autonomous selection capability.
2Reliability
If beamformed transmissions are used in millimeter-wave frequency bands for sidelink communications, then transmission reliability and coverage are improved, but resource collisions and interference increase due to directional nature of beams
Solution Approach 1:
The patent applies local quality by associating different beam directions with different resource allocations. Each beam direction (or spatial sector) is assigned specific time-frequency resources, creating localized resource pools for different spatial regions. This allows beamformed transmissions to maintain their directional reliability while reducing interference, as UEs transmitting in different beam directions use different resources, thereby localizing the resource usage to specific spatial regions.
3Productivity
If multiple sidelink control signals are transmitted in different beam directions using the same time-frequency resources, then resource utilization efficiency is improved, but receiving UEs face difficulty in distinguishing and decoding signals from different directions
Solution Approach 1:
The patent segments the resource pool by beam direction, creating direction-specific resource subsets. Instead of all UEs accessing the same time-frequency resources regardless of beam direction, the resource pool is divided into multiple segments, each associated with a specific beam direction or spatial region. This segmentation allows receiving UEs to focus on decoding signals from specific directions using corresponding receive beams, reducing interference from other directions and simplifying the detection and decoding process while maintaining high resource utilization.
Data Source
AI summary
Disclosed are apparatuses for sidelink resource selection. An example apparatus may include at least one processor and at least one memory. The at least one processor may include computer program code, and the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to transmit a first sidelink control signal and at least one sidelink data signal in a first beam direction, and transmit a second sidelink control signal in a second beam direction different from the first beam direction. Related methods and computer readable media are also disclosed.