Multi-level Indicator for D2D Radio Resource Status
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Solution Overview
Problem
In wireless communication networks, device-to-device (D2D) radio transmissions face challenges such as the 'hidden node' and 'exposed node' problems, where resource allocation inefficiencies lead to collisions and suboptimal utilization of radio resources, particularly in scenarios like V2X communications.
Innovation Solution
A method where radio devices exchange messages to indicate their intention to perform D2D transmissions, with one device determining the status of radio resources and sending a multi-level indicator to others, allowing them to decide on resource utilization and avoid collisions by accurately assessing signal strengths and congestion levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing-based resource allocation is used in mode 4, then resource collision avoidance is improved, but hidden node problems occur leading to transmission failures
Solution Approach 1:
The patent implements a feedback mechanism where receiving UEs send resource status indicators back to transmitting UEs. The receiving UE measures the signal strength of reserved resources and sends back an indicator (e.g., RSRP value or quantized level) that provides feedback on resource availability, enabling the transmitting UE to adjust its resource selection and avoid hidden node collisions.
Solution Approach 2:
The patent introduces an intermediary feedback message as a mediator between transmitting and receiving UEs. This intermediary carries resource status information that bridges the information gap caused by hidden node problems, allowing UEs to make informed resource allocation decisions based on actual channel conditions observed by receiving UEs.
2Productivity
If resource reservation is implemented, then resource allocation efficiency is improved, but exposed node problems occur leading to suboptimal resource utilization
Solution Approach 1:
The patent makes the resource allocation dynamic by allowing UEs to adjust their resource selection based on real-time feedback from receiving UEs. Instead of fixed reservations, the system continuously adapts resource allocation decisions based on measured signal strengths and feedback indicators, enabling optimal resource utilization while avoiding exposed node problems.
Solution Approach 2:
The patent changes the parameter of resource selection by introducing feedback-based parameter adjustment. The transmitting UE modifies its resource selection parameters (time-frequency resources) based on the feedback received from the receiving UE, which provides information about actual channel conditions and interference levels, thereby optimizing resource utilization.
3Measurement precision
If multi-level resource status indicators are used, then resource status precision is improved, but message overhead increases
Solution Approach 1:
The patent applies parameter changes by quantizing the continuous RSRP measurement into discrete levels (e.g., 3-5 levels). This transforms the precise but data-intensive measurement into a compact indicator that conveys sufficient resource status information with minimal overhead, balancing precision and efficiency.
Solution Approach 2:
The patent uses partial action by sending only the essential resource status indicator rather than complete measurement data. The feedback message contains only the quantized level or threshold comparison result, which is sufficient for resource allocation decisions without transmitting excessive data, thus reducing overhead while maintaining measurement precision.
Data Source
AI summary
A radio device receives a first message from a further radio device. The first message indicates an intention of the further radio device to perform a device-to-device radio transmission on a set of radio resources. The radio device determines a status of the set of radio resources. In response to the first message, the radio device sends a second message comprising an indicator which indicates the determined status of the set of radio resources in terms of at least three levels.