Wireless Node Timing Advance for HARQ Feedback
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Solution Overview
Problem
The existing LTE V2X system faces challenges in accurately reporting Hybrid Automatic Repeat Request (HARQ) feedback due to timing ambiguity between sidelink and uplink/downlink transmissions, which affects the correct reception of HARQ reports and increases header overhead.
Innovation Solution
A method is introduced where a first signaling determines a time-frequency resource set and a reference time-frequency resource set, with a Timing Advance (TA) quantity used to adjust the transmission slot of the second signal, avoiding explicit signaling and resolving timing ambiguity by considering differences in numerologies and Subcarrier Spacing (SCS) between uplink and sidelink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a timing offset between sidelink and uplink/downlink is introduced, then the system can support flexible resource allocation, but timing ambiguity occurs between UE and base station on sidelink HARQ report
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission slot of the second signal based on the TA quantity. The TA quantity, which is determined by the first TA table and the first time length, modifies the timing parameter to resolve ambiguity. This allows the system to maintain flexible resource allocation while ensuring accurate HARQ report transmission by changing the temporal parameter of the second signal according to the determined TA value.
2Reliability
If explicit signaling is used to resolve timing ambiguity, then the correct reception of HARQ report is ensured, but header overhead increases
Solution Approach 1:
The patent implements self-service by having the UE autonomously determine the TA quantity using the first TA table and the first time length without requiring explicit signaling from the base station. The UE independently calculates the TA value and adjusts the transmission slot of the second signal accordingly. This self-determination mechanism eliminates the need for additional explicit timing indication signaling, thereby reducing header overhead while ensuring correct HARQ report reception.
3Device complexity
If the TA quantity is determined using a fixed time length, then the configuration is simple, but the timing ambiguity between different numerologies and SCS cannot be resolved
Solution Approach 1:
The patent applies dynamics by making the time length parameter variable rather than fixed. The first time length is selected from multiple candidate time lengths corresponding to different numerologies and Subcarrier Spacing (SCS) configurations. The TA quantity determination dynamically adapts to the specific numerology and SCS of the first signal, allowing the system to resolve timing ambiguity across different numerologies while maintaining configuration simplicity through a structured selection process.
Data Source
AI summary
The present disclosure provides a method and device in nodes used for wireless communication. The node receives a first signaling; transmits a first signal in a first time-frequency resource set; and transmits a second signal in a second time-frequency resource set; the first signaling is used to determine the first time-frequency resource set, and the first signaling is used to determine a reference time-frequency resource set; a first TA quantity is used to determine a TA quantity of an uplink timing relative to a downlink timing; a length of a time interval between a start time of the second time-frequency resource set in time domain and a start time of the reference time-frequency resource set in time domain is equal to a first time length, the first time length is equal to one of X candidate time lengths. The application ensures the correct reception of the feedback.