HARQ-ACK Feedback Multiplexing for Mixed Time-Length Channels
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Solution Overview
Problem
In LTE systems, existing transmission mechanisms based on a subframe transmission time length of 1 millisecond cannot meet the low-latency requirements of emerging services, necessitating a reduction in the transmission time length of the physical downlink shared channel to a timeslot or symbol, and efficiently feeding back the receiving state of data with varying transmission time lengths is crucial for ensuring communication service quality.
Innovation Solution
A method and apparatus for generating and processing HARQ-ACK feedback messages that indicate the receiving states of data channels with different time domain resource lengths, allowing a terminal device to send a single feedback message on a time domain resource of a third time length, which is determined based on the receiving states of data channels with first and second time lengths, where the first time length is less than the second time length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the transmission time length of the physical downlink shared channel is reduced from one subframe to one timeslot or one symbol, then the latency is shortened, but the complexity of feeding back receiving states for multiple data channels with different time lengths increases
Solution Approach 1:
The feedback message is segmented into multiple parts, each corresponding to a data channel with a specific time length. The terminal device generates separate feedback information for each data channel (first feedback information for first data channel, second feedback information for second data channel) and multiplexes them into a unified feedback message structure, allowing the network device to distinguish and process feedback for different time-length channels independently
Solution Approach 2:
A universal feedback message structure is designed that can accommodate feedback for multiple data channels with different time lengths simultaneously. The feedback message includes identification information indicating the time length of each data channel and corresponding feedback information, enabling a single feedback mechanism to handle diverse channel types without requiring separate feedback procedures for each channel length
2Adaptability or versatility
If the terminal device needs to receive downlink data of a plurality of transmission time lengths, then the adaptability to different service requirements is improved, but the complexity of efficiently feeding back receiving states increases
Solution Approach 1:
The feedback message structure is designed to be dynamic and adaptive, where the terminal device determines the feedback message content based on the actual receiving states of different data channels with varying time lengths. The message includes identification information that dynamically indicates the time length of each data channel, allowing the feedback mechanism to adapt to different service requirements and channel configurations without requiring separate fixed structures for each scenario
3Productivity
If a single feedback message is used to indicate receiving states of multiple data channels with different time lengths, then the feedback efficiency is improved, but the difficulty of detecting and measuring the feedback information increases
Solution Approach 1:
Identification information is introduced as an intermediary element within the feedback message that explicitly indicates the time length of each data channel. This intermediary provides clear delimiters and markers that help the network device parse and interpret the multiplexed feedback information, reducing detection difficulty by providing structured guidance on how to associate feedback bits with their corresponding data channels of different time lengths
Data Source
AI summary
A method is provided, including: determining, a first receiving state corresponding to a first data channel and a second receiving state corresponding to a second data channel; generating, a hybrid automatic repeat request-acknowledgement HARQ-ACK feedback message, where the HARQ-ACK feedback message is at least used to indicate the first receiving state and the second receiving state, a first time length of a time domain resource occupied by the first data channel is less than a second time length of a time domain resource occupied by the second data channel; and sending, the HARQ-ACK feedback message on a time domain resource having a third time length. By using the foregoing solution, the terminal device can efficiently feed back, receiving states corresponding to a plurality of data channels or a plurality of pieces of data transmission that occupy time domain resources of different lengths, thereby ensuring communication service quality.