Sidelink HARQ Feedback via Zone ID Distance
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G and IoT environments, face challenges in providing high reliability and high data rate feedback mechanisms for sidelink communications in D2D and V2X systems, especially in scenarios where devices are outside the coverage of traditional base stations.
Innovation Solution
The implementation of a method and device for sidelink feedback transmission and reception that includes resource allocation modes, HARQ operation, and zone ID-based distance calculations to determine HARQ feedback, enabling effective communication even in out-of-coverage scenarios through autonomous resource selection and preconfigured resource pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional base station coverage is used for feedback transmission, then network control and management are improved, but coverage area is limited and devices outside coverage cannot communicate effectively
Solution Approach 1:
The patent enables devices to autonomously select resources and transmit feedback without base station intervention. Devices outside coverage can independently perform HARQ feedback transmission by autonomously selecting resources from preconfigured resource pools, eliminating dependency on base station control and extending effective communication area.
Solution Approach 2:
The patent preconfigures resource pools for feedback transmission before devices enter coverage areas or before communication begins. These preconfigured resources include time-frequency resources and spatial resources that devices can immediately use without waiting for base station allocation, enabling instant feedback transmission in out-of-coverage scenarios.
2Area of stationary object
If autonomous resource selection is implemented for out-of-coverage devices, then coverage area is extended, but resource allocation complexity increases
Solution Approach 1:
The patent changes the resource allocation paradigm from dynamic base station-controlled allocation to static preconfigured resource pool selection. Devices select resources based on predetermined rules and parameters (time-frequency resources, spatial resources) rather than complex real-time negotiations, reducing computational complexity while extending coverage.
Solution Approach 2:
The patent creates copies of resource pools that can be reused across different devices and scenarios. Preconfigured resource pools serve as templates that multiple devices can independently select from, simplifying individual device complexity while collectively extending system coverage area.
3Reliability
If HARQ feedback is transmitted for all received packets, then data reliability is improved, but feedback overhead and transmission time increase
Solution Approach 1:
The patent implements selective HARQ feedback where devices transmit feedback only when necessary (e.g., when decoding fails or when configured to do so). This partial action approach maintains reliability for critical transmissions while reducing overall feedback overhead and time consumption compared to transmitting feedback for every packet.
Solution Approach 2:
The patent employs periodic feedback transmission patterns where devices transmit HARQ feedback at predetermined intervals or under specific conditions rather than continuously. This periodic approach maintains adequate reliability while significantly reducing feedback overhead and transmission time.
Data Source
Figure 1(a)~1(d)
Figure 2(a)~3
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AI summary
A method performed by a first terminal in a wireless communication system, the method comprising obtaining resource pool information associated with a side link; transmitting sidelink control information (SCI) associated with sidelink data on a physical sidelink control channel (PSCCH); and transmitting the sidelink data on a physical sidelink shared channel (PSSCH) based on the SCI, wherein feedback information associated with the sidelink data is received from a second terminal based on a distance between the first terminal and the second terminal, in case that a zone identity (ID) of the first terminal and information on a range requirement are included in the SCI.