D2D Collision Feedback via Signal Quality Thresholds
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in efficiently managing collisions and ensuring reliable communication, particularly in scenarios where autonomous resource selection by user equipment (UEs) can lead to collisions due to the hidden node problem, which affects the reliability and latency of data transmission.
Innovation Solution
A feedback method for D2D communication based on broadcast or multicast, where UEs determine collisions and transmit feedback information including collision resource information and UE behavior data, allowing for retransmissions and resource reselection to avoid collisions, utilizing a processor to assess signal quality and group membership for optimized resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If autonomous resource selection is used by UEs in D2D communication, then device complexity and ease of operation are improved, but collision probability increases due to the hidden node problem
Solution Approach 1:
The patent implements a feedback mechanism where receiving UEs detect collisions in received data and transmit feedback information (including collision resource information and UE behavior information) to transmitting UEs. This feedback loop enables transmitting UEs to identify collisions and perform resource reselection, thereby resolving the technical contradiction by maintaining autonomous resource selection while reducing collision probability through collaborative feedback-based resource management.
2Reliability
If feedback information is transmitted for every collision detection, then communication reliability is improved, but feedback processing overhead and latency increase
Solution Approach 1:
The patent introduces a parameter-based approach where feedback transmission is controlled by comparing signal quality metrics (such as RSRP or SINR) against thresholds. When the signal quality exceeds the threshold, feedback is transmitted to ensure reliability; when it falls below, feedback is suppressed to reduce overhead and latency. This parameter-driven mechanism dynamically adjusts feedback behavior based on channel conditions, resolving the contradiction between reliability and latency.
3Productivity
If collision resource information is included in feedback, then resource allocation efficiency is improved, but feedback message size and processing complexity increase
Solution Approach 1:
The patent segments feedback information into distinct components: collision resource information (indicating which resources experienced collisions) and UE behavior information (indicating what actions the receiving UE took). This segmentation allows transmitting UEs to process only relevant portions of the feedback based on their specific needs, reducing overall processing complexity while maintaining resource allocation efficiency. Each component can be independently decoded and acted upon.
Data Source
AI summary
The method for feedback for broadcast- or multicast-based device-to-device communication in a wireless communication system, according to one embodiment of the present disclosure, is performed by a first terminal and may comprise the steps of: determining whether or not a collision has occurred in data received from a counterpart terminal; and in response to the determination that a collision has occurred, transmitting feedback information, including collision resource information and terminal operation information, to the counterpart terminal.