HARQ Codebook Determination for Satellite Feedback Adaptability
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Solution Overview
Problem
Current HARQ semi-static codebooks are designed for HARQ-enabled scenarios and do not account for HARQ-disabled processes in satellite communication, leading to unsuitable feedback behaviors and potential errors in terminal devices.
Innovation Solution
A method for determining an HARQ codebook based on HARQ enabling types for PDSCH transmissions, allowing terminal devices to adjust feedback behaviors according to whether HARQ is enabled or disabled, thereby standardizing feedback in both scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the current HARQ semi-static codebook is used for HARQ-enabled processes, then the feedback mechanism works correctly for terrestrial communication, but it cannot handle HARQ-disabled processes in satellite communication scenarios
Solution Approach 1:
The patent introduces dynamic determination of HARQ codebook content based on the enabling type of each HARQ process. The terminal device dynamically adjusts which HARQ feedback information to include in the codebook by checking whether each HARQ process is enabled or disabled, rather than using a fixed semi-static codebook structure. This dynamic adaptation resolves the contradiction by making the feedback mechanism flexible enough to handle both HARQ-enabled and HARQ-disabled processes appropriately.
Solution Approach 2:
The patent applies different feedback handling rules to different HARQ processes based on their enabling types. For HARQ-enabled processes, the terminal device includes proper HARQ feedback information in the codebook. For HARQ-disabled processes, the terminal device excludes or marks these processes differently in the codebook. This local differentiation allows the system to maintain high reliability for HARQ-enabled processes while properly accommodating HARQ-disabled processes in satellite scenarios.
2Reliability
If HARQ feedback is performed for all PDSCH transmissions, then transmission reliability is improved for HARQ-enabled processes, but unnecessary feedback overhead and potential errors occur for HARQ-disabled processes
Solution Approach 1:
The patent extracts or removes HARQ feedback information for HARQ-disabled processes from the HARQ codebook. When determining the codebook content, the terminal device identifies HARQ-disabled processes and excludes their feedback information or marks them with a specific indicator that prevents misinterpretation. This extraction eliminates unnecessary feedback overhead and potential errors associated with HARQ-disabled processes while maintaining reliable feedback for HARQ-enabled processes.
Solution Approach 2:
Instead of providing complete HARQ feedback for all PDSCH transmissions (excessive action), the patent applies partial feedback action by selectively including only HARQ-enabled processes in the feedback codebook. This partial approach optimizes the feedback mechanism by providing exactly the right amount of feedback needed - sufficient for reliability where required (HARQ-enabled) and minimal where not needed (HARQ-disabled), thereby reducing overhead without compromising essential transmission reliability.
Data Source
AI summary
A method for determining a hybrid automatic repeat request (HARQ) codebook is performed by a terminal device, and includes: determining, according to HARQ enabling types for a plurality of physical downlink shared channel (PDSCH) transmissions transmitted on a specified HARQ feedback resource, an HARQ codebook corresponding to the specified HARQ feedback resource.