Inter-UE Coordination via Sidelink Feedback Channel
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Solution Overview
Problem
Current sidelink communication technologies face issues such as resource collisions, inefficient resource utilization, and power consumption due to the hidden-node, exposed-node, and half-duplex problems, which degrade performance in vehicular communication scenarios.
Innovation Solution
Implementing inter-UE coordination mechanisms where one UE sends conflict indicators and resource information to another UE to avoid resource conflicts, using a physical sidelink feedback channel for conflict indication and resource reselection, and configuring the feedback channel with specific timing and frequency allocations to enhance resource allocation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs autonomously select resources from a shared resource pool without coordination, then resource allocation flexibility is improved, but resource collisions increase due to hidden-node and exposed-node problems
Solution Approach 1:
The patent implements a feedback mechanism where UEs send conflict indicators to neighboring UEs about detected resource conflicts. This feedback loop allows UEs to adjust their resource selections based on actual conflict information from the network, resolving the contradiction between autonomous selection flexibility and collision avoidance reliability.
Solution Approach 2:
The conflict indicator acts as an intermediary information element that mediates between autonomous resource selection and collision avoidance. By introducing this intermediate signaling mechanism, UEs can maintain flexible autonomous selection while indirectly coordinating to avoid conflicts through the conflict indicator feedback.
2Measurement precision
If UEs continuously monitor resources to detect conflicts, then resource collision detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having UEs send conflict indicators in advance based on preliminary conflict detection, rather than continuously monitoring. This allows power-saving operation where full monitoring is not needed, as the conflict indicator mechanism provides advance warning of potential conflicts.
Solution Approach 2:
The system uses self-service by having UEs report conflicts only when detected, rather than requiring continuous active monitoring from all UEs. This reduces overall power consumption while maintaining detection accuracy through event-driven reporting.
3Reliability
If conflict indicators are transmitted frequently to ensure reliable conflict information, then resource allocation reliability is improved, but feedback channel overhead increases
Solution Approach 1:
The patent implements periodic action by having UEs transmit conflict indicators periodically or event-driven rather than continuously. This reduces feedback channel overhead while maintaining reliability through regular updates at appropriate intervals.
Solution Approach 2:
The system uses partial action by transmitting conflict indicators only when conflicts are detected or at specific intervals, rather than continuously. This partial monitoring approach reduces overhead while maintaining sufficient reliability for resource allocation decisions.
Data Source
AI summary
According to embodiments, a first UE (e.g., UE A) receives from a second UE (e.g., UE B) a sidelink control information (SCI) in a first slot. The SCI comprises a resource reservation for a shared channel. The resource reservation indicates a set of frequency resources and a time resource assignment. The first UE transmits to the second UE a conflict indicator on resources of a feedback channel. The resources of the feedback channel include a second slot for transmitting the conflict indicator. A location of the second slot is based on one of the first slot or a slot indicated by the time resource assignment. The conflict indicator indicates a potential resource conflict or a detected resource conflict on at least one of the set of frequency resources or the time resource assignment indicated by the resource reservation.