HARQ-ACK Feedback Method for NR-U Carrier Reception Indication
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Solution Overview
Problem
In NR-U technologies, the existing one shot Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback method requires terminals to feedback HARQ-ACK information for all Hybrid Automatic Repeat Request (HARQ) processes at once, leading to inefficient use of transmission resources as terminals must report feedback for carriers with no downlink data transmission.
Innovation Solution
A method and apparatus for HARQ-ACK feedback where a terminal sends feedback information based on the reception condition of downlink data, including carrier reception indication information and HARQ-ACK information. The carrier reception indication information indicates whether downlink data is received on a first carrier or not received on a second carrier, allowing the terminal to only feedback HARQ-ACK information for carriers with received data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal feeds back HARQ-ACK information for all HARQ processes at one time, then the base station can obtain complete feedback information, but the feedback overhead increases and transmission resources are wasted
Solution Approach 1:
The patent extracts and separates the carrier reception indication information from the HARQ-ACK feedback information. The terminal first indicates which carriers have received downlink data through carrier reception indication information, and only then provides HARQ-ACK feedback for those specific carriers. This extraction principle eliminates the need to feedback for carriers with no downlink data transmission, reducing feedback overhead while maintaining information completeness.
Solution Approach 2:
The patent segments the feedback information into two parts: carrier reception indication information and HARQ-ACK information. The carrier reception indication information identifies which carriers have downlink data, and the HARQ-ACK information provides acknowledgment only for those carriers. This segmentation allows the system to avoid transmitting unnecessary feedback for all carriers, thereby reducing overall feedback overhead.
2Reliability
If the terminal reports feedback for all carriers, then the base station can monitor all carriers, but transmission resources are used inefficiently
Solution Approach 1:
The patent extracts the carrier reception indication information to identify which carriers actually have downlink data transmission. The base station uses this indication to determine which carriers require monitoring and feedback, rather than monitoring all carriers uniformly. This extraction approach maintains reliable monitoring of carriers with data while eliminating waste on carriers without data.
Solution Approach 2:
The patent introduces dynamic carrier reception indication information that adapts to the actual downlink data transmission status. The terminal dynamically indicates which carriers have received data, allowing the base station to dynamically adjust its monitoring and feedback requirements. This dynamic approach improves transmission resource efficiency by focusing monitoring efforts only on carriers that require attention.
3Loss of information
If the terminal feeds back HARQ-ACK information for all HARQ processes, then the base station can track all downlink transmissions, but signaling efficiency decreases
Solution Approach 1:
The patent extracts carrier reception indication information to identify which carriers have downlink data transmission. The terminal then provides HARQ-ACK feedback only for those identified carriers, rather than for all carriers. This extraction mechanism maintains complete tracking of actual downlink transmissions while significantly reducing signaling overhead by eliminating feedback for carriers with no data.
Solution Approach 2:
The patent segments the feedback process into two stages: first, the terminal indicates which carriers have received data through carrier reception indication information; second, the terminal provides HARQ-ACK feedback only for those carriers. This segmentation of the feedback mechanism allows complete tracking of downlink transmissions to occur only where necessary, reducing overall signaling overhead.
Data Source
AI summary
The present disclosure provides a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback method, which is applied to a terminal and includes: sending feedback information according to a receiving condition of downlink data, wherein the feedback information includes: carrier reception indication information and HARQ-ACK information; wherein the carrier reception indication information is used for indicating that the terminal receives the downlink data on a first carrier and/or does not receive the downlink data on a second carrier; and the HARQ-ACK information is feedback information of the downlink data received on the first carrier.