Disabling HARQ Feedback for Sidelink Communication When Location Data Is Unavailable
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Solution Overview
Problem
In vehicle-to-everything (V2X) communications, when a UE loses its location information, it cannot perform distance-based group operations, leading to potential incorrect operations or unnecessary retransmissions if HARQ feedback is not properly managed.
Innovation Solution
A method and communication device that allow disabling of option 1 hybrid automatic repeat request (HARQ) feedback for sidelink communication when the UE's location information is unavailable, preventing incorrect operations and unnecessary retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is disabled when location information is unavailable, then incorrect interpretations and unnecessary retransmissions are prevented, but the complexity of managing HARQ feedback states increases
Solution Approach 1:
The transmitting UE proactively sends a NACK feedback message when location information is unavailable, rather than waiting for the receiving UE to initiate feedback. This preliminary action prevents the receiving UE from misinterpreting the lack of feedback as an ACK, thereby avoiding unnecessary retransmissions while maintaining clear feedback state management
Solution Approach 2:
The patent implements a feedback mechanism where the transmitting UE monitors its own transmission state and sends explicit NACK feedback when location information is unavailable. This feedback loop ensures that the receiving UE is properly informed about the transmission status, preventing incorrect interpretations and maintaining reliable communication
2Productivity
If distance-based group operations are performed, then communication efficiency is improved, but incorrect operations occur when location information is lost
Solution Approach 1:
The patent dynamically adjusts the HARQ feedback behavior based on the availability of location information. When location information is available, the system performs distance-based group operations with normal feedback mechanisms. When location information becomes unavailable, the system automatically switches to sending NACK feedback, ensuring operation accuracy is maintained while preserving communication efficiency
Solution Approach 2:
The patent changes the feedback parameter from silent (no feedback) or ACK-based to NACK-based when location information availability changes. This parameter adaptation ensures that the system maintains both communication efficiency through distance-based operations and operation accuracy by adjusting feedback behavior according to the current state
Data Source
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Figure 5A~5B
AI summary
A method includes receiving a first indicator indicating distance based HARQ feedback operation with negative acknowledgement only and a first sidelink message grant; and determining that location information associated with a first communication device is unavailable, and based thereon, transmitting a second indicator indicating that location information is unavailable