Terminal HARQ-ACK Resource Configuration for NR V2X Sidelink
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Solution Overview
Problem
There is a need to clarify the operation for transmitting Hybrid Automatic Repeat Request (HARQ)-ACK from a terminal to a base station when a configured grant is applied in SL transmission mode 1 specified in NR V2X, particularly in scenarios involving sidelink HARQ.
Innovation Solution
A terminal is configured with a receiving unit to receive signals from a base station, a control unit to set up periodic sidelink resources and uplink control channel resources for transmitting HARQ-ACK to the base station, and a transmitting unit to transmit the HARQ-ACK on the configured uplink control channel resource, explicitly specifying the PUCCH resource for HARQ-ACK transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If configured grant is applied in SL transmission mode 1, then resource allocation efficiency is improved, but HARQ-ACK transmission operation becomes unclear
Solution Approach 1:
The base station performs preliminary configuration of PUCCH resources for HARQ-ACK transmission before the terminal actually transmits HARQ-ACK. The configuration includes pre-defining resource pools, time-frequency resources, and transmission parameters, so that when configured grant is applied, the terminal can directly use the pre-configured resources without ambiguity about HARQ-ACK transmission operations.
2Device complexity
If PUCCH resource is not explicitly specified, then device complexity is reduced, but communication reliability deteriorates due to misinterpretation of HARQ-ACK failure
Solution Approach 1:
The base station configures and provides feedback information to the terminal about PUCCH resource allocation for HARQ-ACK transmission. This feedback mechanism ensures that the terminal has accurate information about where and how to transmit HARQ-ACK, preventing misinterpretation of transmission failures while maintaining clear configuration through standardized feedback channels.
3Quantity of substance
If PUCCH resource is not explicitly specified, then resource allocation overhead is reduced, but unnecessary resource allocation occurs due to HARQ-ACK failure misinterpretation
Solution Approach 1:
The terminal uses self-service mechanisms to determine PUCCH resources for HARQ-ACK transmission by autonomously selecting from pre-configured resource pools based on clear rules provided by the base station. This self-determination capability reduces signaling overhead while ensuring that the terminal can correctly identify appropriate resources without unnecessary allocation or misinterpretation of transmission status.
Data Source
AI summary
A terminal includes a receiving unit configured to receive a signal from a base station; a control unit configured to configure a periodic sidelink resource for transmitting data on sidelink based on the signal received by the receiving unit, and to configure an uplink control channel resource for transmitting, to the base station, a first Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK) corresponding to a HARQ-ACK of a sidelink communication received by the receiving unit; and a transmitting unit configured to transmit the first HARQ-ACK on the uplink control channel resource configured by the control unit.