Sidelink HARQ Feedback Timing Adjustment for 5G NR V2X
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Solution Overview
Problem
The existing LTE V2X system faces challenges in designing an efficient method for User Equipment (UE) to report Hybrid Automatic Repeat Request (HARQ) feedback to the base station, particularly in ensuring timely and accurate transmission of sidelink HARQ reports, which is critical for 5G NR V2X scenarios.
Innovation Solution
A method is introduced where a reference delay is defined and used to determine the timing of sidelink HARQ reports, ensuring that the delay between receiving HARQ feedback and reporting it to the network does not exceed the UE's processing capacity, and timing offsets are managed to avoid ambiguity and reduce header overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a reference delay is defined and used to determine the timing of sidelink HARQ reports, then the complexity of UE implementation is reduced and correct and timely sidelink HARQ report transmission is ensured, but the delay between receiving HARQ feedback and reporting it to the network must be carefully managed to not exceed UE processing capacity
Solution Approach 1:
The patent applies parameter changes by adjusting the reference delay value based on subcarrier spacing configurations. Different reference delay values are defined for different subcarrier spacing (e.g., 15 kHz, 30 kHz, 60 kHz), allowing the system to optimize the balance between UE processing capacity and timely HARQ feedback reporting. This parameter adaptation resolves the contradiction by making the delay manageable within UE capabilities while ensuring timely reporting.
Solution Approach 2:
The patent implements preliminary action by pre-defining reference delay values in the specification for different subcarrier spacing configurations. This allows UEs to be prepared in advance with the appropriate delay parameters, eliminating the need for complex real-time calculations and reducing implementation complexity while ensuring timely HARQ feedback reporting.
2Measurement precision
If timing offsets are managed to avoid ambiguity in sidelink HARQ report transmission, then the accuracy of timing determination is improved, but the header overhead is reduced requiring efficient encoding
Solution Approach 1:
The patent uses parameter changes by defining timing offset values in terms of slots or symbols based on subcarrier spacing. The timing offset is expressed as a function of the reference delay and subcarrier spacing, allowing accurate timing determination while using compact representations that minimize header overhead. For example, timing offsets are defined as integer multiples of slot durations which vary with subcarrier spacing.
3Adaptability or versatility
If the minimum delay is adjusted based on subcarrier spacing to improve sidelink communication efficiency, then the adaptability to different 5G NR scenarios is improved, but the device complexity increases requiring support for multiple delay configurations
Solution Approach 1:
The patent applies parameter changes by defining a set of reference delay values corresponding to different subcarrier spacing configurations (15 kHz, 30 kHz, 60 kHz, etc.). The UE selects the appropriate reference delay based on the configured subcarrier spacing, enabling adaptation to different 5G NR scenarios without requiring complex real-time adjustments. This standardized parameter set balances adaptability with manageable device complexity.
Data Source
AI summary
The present disclosure provides a method and device in nodes used for wireless communication. A node receives a first signaling; transmits a first signal; receives a second signaling; and transmits a second signal; the first signaling is used to determine time-frequency resources occupied by the first signal, the first signaling is used to determine radio resources occupied by the second signal, and time-frequency resources occupied by the first signal are used to determine radio resources occupied by the second signaling; a length of a time interval between an end time for receiving the second signaling and a start time for transmitting the second signal is equal to a first delay; the first delay is not less than a reference delay, and the reference delay is related to a subcarrier spacing (SCS) occupied by the second signal in frequency domain. The application ensures the correct reception of the feedback.