Sidelink Communication Feedback Filtering by Distance and Signal Strength
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Solution Overview
Problem
In device-to-device communication systems, particularly in V2X communication, the large amount of redundant feedback information due to varying channel conditions among receiving terminal devices leads to resource inefficiency, affecting inter-device communication reliability.
Innovation Solution
A method to determine the distance and signal strength between terminal devices, categorizing them into specified areas based on thresholds, to optimize resource allocation and reduce redundant feedback information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information is transmitted for all receiving terminal devices to ensure reliability, then communication reliability is improved, but resource utilization deteriorates due to large amount of redundant feedback information
Solution Approach 1:
The patent applies local quality by differentiating feedback requirements based on terminal device location. Terminal devices are divided into first set (within threshold distance) and second set (beyond threshold distance). Only terminal devices in the second set transmit feedback information, creating location-specific feedback behavior that eliminates redundant feedback from devices with good channel conditions while maintaining reliability for devices with poor channel conditions.
2Adaptability or versatility
If feedback information is transmitted for all receiving terminal devices, then feedback coverage is improved, but device complexity increases due to need to configure different resources for different devices
Solution Approach 1:
The patent segments the group of terminal devices into two distinct sets based on distance threshold: first set (within threshold) and second set (beyond threshold). This segmentation simplifies resource configuration by applying uniform feedback rules to each segment, avoiding the complexity of configuring individual resources for each device while maintaining comprehensive feedback coverage from devices that need it.
3Loss of information
If feedback information is transmitted by all terminal devices, then information completeness is improved, but loss of useful information increases due to redundant feedback occupying resources
Solution Approach 1:
The patent changes the parameter of feedback transmission behavior based on the distance parameter. Terminal devices determine their distance from the sending device and change their feedback transmission state accordingly: devices within threshold distance do not transmit feedback, while devices beyond threshold distance transmit feedback. This parameter-based differentiation ensures information completeness from devices that need it while eliminating redundant feedback that would consume resources.
Data Source
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AI summary
This application provides a communication method, and a distance determining method and apparatus, to reduce an amount of feedback information and a quantity of resources of feedback information occupied by the feedback information, and improve resource utilization and communication efficiency. The method includes: A first terminal device sends a first signal. A second terminal device determines whether a location of the second terminal device is a specified area. If the location of the second terminal device is the specified area, the second terminal device sends feedback information. If the location of the second terminal device is not the specified area, the second terminal device does not send feedback information or sends less feedback information. The specified area is an area to which a distance from the first terminal device is greater than or equal to a lower distance threshold and/or less than or equal to an upper distance threshold; or the specified area is an area in which strength of a signal received from the first terminal device is greater than or equal to a lower signal strength threshold and/or less than or equal to an upper signal strength threshold. This method is applicable to communication, for example, V2X communication or D2D communication, between terminal devices on a sidelink.