Receiving Terminal HARQ Reporting for Direct NR Communication
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Solution Overview
Problem
In direct terminal-to-terminal communication in NR, the reporting of Hybrid Automatic Repeat Request (HARQ) responses to the base station is not clearly defined when the receiving terminal handles the reporting, leading to unknown system configurations and potential delays.
Innovation Solution
A terminal is equipped with a receiving unit to receive control information from another terminal or a base station, a transmitting unit to send a response related to the retransmission process, and a control unit to determine the response based on received information, enabling the receiving terminal to transmit HARQ responses directly to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transmitting terminal reports HARQ response to the base station, then the system configuration is simple, but the delay performance deteriorates
Solution Approach 1:
Instead of the transmitting terminal reporting HARQ response to the base station, the invention inverts the reporting direction by having the receiving terminal report the HARQ response. This inversion resolves the contradiction by achieving both simplified system configuration and improved delay performance, as the receiving terminal can immediately report after decoding the data without waiting for the transmitting terminal's processing.
2Loss of time
If the receiving terminal reports HARQ response to the base station, then the delay performance is improved, but the system configuration complexity increases
Solution Approach 1:
The base station is designed with multi-functionality to handle both traditional downlink HARQ reporting and the new uplink HARQ reporting from receiving terminals. This universality allows the system to accommodate the improved delay performance mechanism without requiring separate specialized configurations, thus resolving the contradiction between delay improvement and configuration complexity.
3Loss of time
If detailed configuration for receiving terminal HARQ reporting is defined, then the delay performance improves, but the ease of operation deteriorates
Solution Approach 1:
The invention introduces specific parameters and configuration elements for HARQ reporting, such as harq-ACK-Tx and harq-ACK-Rx configurations, that allow flexible control of the reporting mechanism. By changing and optimizing these parameters, the system achieves improved delay performance while maintaining ease of operation through standardized configuration procedures and clear operational rules for terminals.
Data Source
AI summary
A terminal includes a receiving unit configured to receive control information from at least one of another terminal and a base station, and to receive data from the another terminal; a transmitting unit configured to transmit, to the base station, a response relating to a retransmission process corresponding to the data; and a control unit configured to determine the response, based on at least one of the control information received from the another terminal and the control information received from the base station.