Uplink Feedback HARQ Codebook Transmission for Delay Reduction
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Solution Overview
Problem
In communication systems operating in shared spectra, the transmission delay of uplink feedback information occurs when the channel occupancy state is busy, leading to performance degradation.
Innovation Solution
A method and apparatus for transmitting or receiving uplink feedback information, where a terminal receives downlink control information, generates a hybrid automatic repeat request (HARQ) codebook, and transmits it to the base station through a physical uplink control channel (PUCCH), allowing multiple HARQ responses to be sent in a single PUCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal transmits uplink feedback information using a single PUCCH when the channel occupancy state is busy, then the transmission delay of uplink feedback information increases, but the device complexity remains low
Solution Approach 1:
The patent combines multiple HARQ responses into a single PUCCH transmission by merging feedback information from multiple downlink slots into one uplink feedback message. This allows the terminal to transmit accumulated HARQ-ACK information for multiple PDSCH receptions in a single PUCCH, thereby reducing transmission delay without significantly increasing device complexity
Solution Approach 2:
The terminal performs preliminary accumulation of HARQ responses in a codebook structure before transmission. By preparing the feedback information in advance and organizing it into a structured codebook that includes HARQ-ACK information for multiple slots, the terminal can transmit all feedback simultaneously when the channel becomes available, reducing overall transmission delay
2Productivity
If the terminal transmits multiple HARQ responses in a single PUCCH, then the productivity of feedback transmission improves, but the device complexity increases
Solution Approach 1:
The patent segments the feedback transmission problem by dividing it into codebook construction (grouping HARQ responses) and codebook transmission (sending the grouped feedback). The terminal segments multiple HARQ responses into a structured codebook with specific formatting rules, which simplifies the transmission process and improves productivity while keeping device complexity manageable through systematic organization
Solution Approach 2:
The PUCCH is designed to serve multiple functions: it can transmit HARQ-ACK information for a single PDSCH or multiple PDSCHs across different slots. This multi-functionality allows the same physical channel to handle varying feedback loads, improving productivity without requiring separate dedicated channels for each scenario and thus limiting the increase in device complexity
Data Source
AI summary
Disclosed are a method and an apparatus for transmitting or receiving uplink feedback information in a communication system. An operation method of a terminal may comprise receiving downlink control information (DCI) from a base station, the DCI including resource allocation information of a physical downlink shared channel (PDSCH); receiving data #n from the base station through the PDSCH indicated by the DCI; generating a hybrid automatic repeat request (HARQ) codebook including an HARQ response bit #n for the data #n and an HARQ response bit #n−1 for data #n−1 received from the base station before the data #n; and transmitting the HARQ codebook to the base station. Therefore, the performance of the communication system can be improved.