HARQ-ACK Codebook Generation for Unscheduled PDCCH
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Solution Overview
Problem
There is a need for a communication system that supports higher data transmission rates while performing hybrid automatic repeat request (HARQ) operations.
Innovation Solution
A method for performing HARQ operations involves receiving downlink signals, including a physical downlink control channel (PDCCH) that does not schedule a physical downlink shared channel (PDSCH) reception, and generating a HARQ-acknowledgement (ACK) codebook for the downlink signals. This method is implemented in a terminal equipped with a transceiver and a controller to manage the HARQ operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal generates a HARQ-ACK codebook for each PDCCH received, then the HARQ operation reliability is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts the HARQ-ACK feedback generation for PDCCHs that do not schedule PDSCH reception as a separate case. The terminal identifies and processes these unscheduled PDCCHs differently from scheduled PDCCHs, extracting only the necessary HARQ-ACK feedback information while avoiding unnecessary processing overhead for control channel acknowledgments.
Solution Approach 2:
The patent implements dynamic adaptation of HARQ-ACK codebook generation based on the PDCCH content. The terminal dynamically determines whether to generate HARQ-ACK feedback for each PDCCH based on whether it schedules a PDSCH reception, making the feedback mechanism flexible and adaptive to different transmission scenarios rather than following a fixed pattern.
2Reliability
If the terminal transmits HARQ-ACK feedback for all downlink signals, then the data transmission reliability is improved, but the uplink resource consumption increases
Solution Approach 1:
The patent applies partial action by having the terminal transmit HARQ-ACK feedback only for PDCCHs that actually schedule PDSCH receptions, rather than for all received PDCCHs. This selective feedback approach provides sufficient reliability for data transmission while avoiding excessive uplink resource consumption that would result from acknowledging every control channel.
3Reliability
If the terminal processes PDCCH without PDSCH scheduling, then the control channel reliability is improved, but the feedback overhead increases
Solution Approach 1:
The patent extracts and separates the handling of PDCCHs that do not schedule PDSCH from those that do. By identifying this specific subset of PDCCHs, the system can provide appropriate acknowledgment handling for control channel reliability while preventing these unscheduled PDCCHs from contributing to unnecessary feedback overhead in the HARQ-ACK codebook.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method and an apparatus for performing a hybrid automatic repeat request (HARQ) operation are provided. The method includes receiving downlink signals, wherein the downlink signals include a physical downlink control channel (PDCCH) that does not schedule a physical downlink shared channel (PDSCH) reception, and/or one or more multicast PDSCHs, and generating a HARQ-ACK codebook for the downlink signals. The invention can improve communication efficiency.