PSFCH Hopping Parameters for NR-V2X HARQ Feedback
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Solution Overview
Problem
The configuration details for the Physical Sidelink Feedback Channel (PSFCH) to transmit Hybrid Automatic Repeat reQuest (HARQ) responses in terminal-to-terminal direct communication in NR-V2X have not been realized, as they are shared with the Physical Uplink Control Channel (PUCCH).
Innovation Solution
A terminal is configured with parameters for group hopping or sequence hopping applied to channels for transmitting and receiving HARQ responses in terminal-to-terminal direct communication, using a format specific for this purpose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the PSFCH uses a format shared with PUCCH configuration, then the system can leverage existing uplink control channel structures, but the HARQ response transmission for direct terminal-to-terminal communication cannot be realized
Solution Approach 1:
The patent segments the PSFCH configuration from the PUCCH configuration by introducing terminal-to-terminal specific parameters (first parameter for group hopping, second parameter for sequence hopping) that are independently settable. This allows the PSFCH to be divided into a reusable part (shared format structure) and a customizable part (terminal-specific hopping parameters), resolving the contradiction between configuration reusability and reliable HARQ transmission.
Solution Approach 2:
The patent applies local quality by making the hopping parameters terminal-specific rather than universally shared. The first parameter determining group hopping and the second parameter determining sequence hopping are set individually for each terminal engaging in direct communication, allowing each terminal to optimize its HARQ response transmission characteristics while maintaining overall system compatibility.
2Reliability
If a dedicated format for terminal-to-terminal communication is implemented, then reliable HARQ response transmission is achieved, but the configuration complexity increases
Solution Approach 1:
The patent extracts the essential elements needed for reliable terminal-to-terminal HARQ transmission (group hopping and sequence hopping parameters) from the complex PUCCH configuration framework. By isolating these specific parameters (first and second parameters) that can be independently set, the solution reduces configuration complexity while maintaining reliability, as only these extracted parameters need to be managed separately rather than the entire PUCCH configuration.
Solution Approach 2:
The patent introduces dynamic hopping parameters that can be flexibly adjusted for terminal-to-terminal communication. The group hopping and sequence hopping parameters can be dynamically set based on communication conditions, allowing the system to adapt to varying requirements without rigid configuration structures, thereby reducing overall configuration complexity while ensuring reliable transmission.
Data Source
AI summary
A terminal includes a receiving unit configured to receive data from another terminal, a control unit configured to set: a first parameter which determines a group hopping; or a second parameter which determines a sequence hopping, the group hopping or the sequence hopping being applied to a channel used for transmitting and receiving a response associated with a retransmission control, and a transmitting unit configured to transmit the response associated with the retransmission control corresponding to the data to the another terminal via the channel to which the group hopping or the sequence hopping is applied, wherein the first parameter and the second parameter are set for a terminal-to-terminal direct communication.