Beam-Specific Sidelink Feedback Configuration for Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in sidelink communications due to complex resource selection for feedback, leading to unreliable data transmission and retransmissions, especially when different directional beams have varying priorities.
Innovation Solution
Implementing beam-specific feedback configurations, where transmitting UEs configure different feedback schemes for each directional beam based on priority, using sidelink control information and radio resource control signaling to indicate ACK/NACK or NACK-only feedback, allowing receiving UEs to select appropriate resources and timing for feedback and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-specific feedback configurations are implemented for different directional beams, then feedback granularity and communication reliability are improved, but device complexity and configuration overhead increase
Solution Approach 1:
The feedback configuration is segmented by directional beam, with each beam having its own independent feedback configuration (ACK/NACK-only). This segmentation allows the system to apply different feedback granularities to different beams based on their priority and communication requirements, improving reliability without requiring a completely different system-wide approach.
Solution Approach 2:
Different feedback configurations are applied locally to different beams rather than uniformly across all communications. High-priority beams receive ACK/NACK feedback for maximum reliability, while lower-priority beams use NACK-only feedback, optimizing the balance between reliability and complexity for each local communication context.
2Productivity
If different feedback schemes are configured for different beams, then resource selection efficiency improves, but signaling overhead increases
Solution Approach 1:
The feedback configuration is predetermined and signaled in advance through SCI or RRC signaling before actual feedback transmission occurs. This preliminary configuration allows receiving UEs to know in advance which feedback scheme to use for each beam, improving resource selection efficiency without requiring complex real-time negotiations.
Solution Approach 2:
The system changes the feedback configuration parameter (ACK/NACK-only) based on beam priority and communication requirements. This parameter change allows flexible adaptation of feedback granularity without requiring fundamentally different protocols, managing signaling overhead while improving efficiency.
3Reliability
If ACK/NACK feedback is used for high-priority beams, then communication reliability improves, but feedback resource requirements increase compared to NACK-only feedback
Solution Approach 1:
The system applies different feedback resource requirements locally to different beams based on their priority. High-priority beams that require ACK/NACK feedback are allocated appropriate feedback resources, while lower-priority beams use NACK-only feedback with reduced resource requirements, optimizing the overall resource distribution.
Solution Approach 2:
Instead of applying full ACK/NACK feedback to all beams (excessive action), the system applies it only where necessary for high-priority communications (partial action). This selective approach ensures sufficient feedback reliability for critical communications while avoiding unnecessary resource consumption for lower-priority beams.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may select a first and second directional beam for communicating with one or more UEs on a first and second sidelink communication link. In some cases, the UE may identify a first sidelink feedback configuration for the first directional beam. The UE may also identify a second sidelink feedback configuration for the second directional beam, where the second sidelink configuration may be different from the first sidelink feedback configuration. In some examples, the UE may transmit an indication of the first sidelink feedback configuration and the second sidelink feedback configuration to the one or more UEs, where received feedback for sidelink messages sent over the directional beams may be based on the different sidelink feedback configurations. In addition, feedback resources may be based on a beam identifier of a beam used to transmit an initial sidelink message.