Sidelink Control Information Forwarding for Hidden Node Interference
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Solution Overview
Problem
In sidelink communications, particularly in V2X and D2D scenarios, hidden node interference causes transmitters to fail in receiving sidelink control information due to signal strength issues or traffic configurations, leading to potential collisions and resource wastage, as they may not be aware of reserved resources by other transmitters.
Innovation Solution
Implementing a technique where a receiver UE forwards sidelink control information to another transmitter UE, enabling the latter to determine reserved resources and avoid overlaps in time and frequency, using signal-to-interference ratio measurements to select non-overlapping resources and prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transmitter UE selects resources for data transmission without receiving SCI from hidden node transmitters, then the transmitter can proceed with transmission, but hidden node interference causes resource conflicts and transmission failures
Solution Approach 1:
The receiver UE acts as an intermediary by receiving SCI from the hidden node transmitter and forwarding it to the transmitter UE. This mediator mechanism enables the transmitter to become aware of reserved resources without requiring direct communication between transmitters, thus resolving hidden node interference issues while maintaining transmission efficiency
Solution Approach 2:
The system implements feedback by having the receiver UE forward received SCI information back to the transmitter UE. This feedback loop enables the transmitter to adjust its resource selection based on information about hidden node reservations, improving both reliability and productivity
2Ease of operation
If the transmitter UE cannot decode SCI due to signal strength issues or traffic configuration, then the transmitter can operate without interference, but the transmitter becomes unaware of reserved resources leading to collisions
Solution Approach 1:
The receiver UE serves as an intermediary that receives SCI from hidden node transmitters and forwards it to the transmitter UE. This resolves the information loss problem by ensuring the transmitter becomes aware of reserved resources even when direct SCI decoding would fail due to signal strength or traffic configuration constraints
Solution Approach 2:
The receiver UE performs self-service by autonomously forwarding received SCI information to the transmitter. This self-service mechanism ensures that resource reservation information is propagated without requiring additional signaling or coordination, maintaining ease of operation while preventing information loss
3Adaptability or versatility
If multiple transmitters use non-overlapping RB frequency resources simultaneously, then frequency diversity is utilized, but IBE collision still occurs when transmitters are located at different distances from the receiver
Solution Approach 1:
The receiver UE provides feedback by forwarding SCI information about reserved resources to transmitter UEs. This feedback mechanism enables transmitters to adjust their resource selection and avoid IBE collisions even when using non-overlapping frequency resources, thus maintaining adaptability while reducing harmful interference
Solution Approach 2:
The system performs preliminary action by having transmitters receive and process SCI information about reserved resources before selecting their own transmission resources. This preliminary awareness allows transmitters to avoid IBE collisions proactively, enabling flexible resource utilization without harmful interference
Data Source
AI summary
Apparatus, methods, and computer-readable media for sidelink control information forwarding for sensing procedure are disclosed herein. An example method of wireless communication at a forwarding user equipment (UE) includes receiving, from a forwarded UE, control information, and transmitting, to a sensing UE, a forward message including the control information and information associated with the forwarded UE. An example method of wireless communication at the sensing UE includes receiving, from the forwarding UE, a forward message including the control information containing a first measurement of the control information. The example method also includes obtaining a second measurement of the forward message and determining a ratio of the second measurement to the first measurement. The example method also includes selecting a specific resource based on the ratio and whether the forwarding UE is an intended receiver for the sensing UE or the forwarding UE intends to receive from the forwarded UE.