CG-DFI Composition for Uplink HARQ Feedback Beyond 16 Processes
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Solution Overview
Problem
The challenge of providing feedback for multiple uplink Hybrid Automatic Repeat Request (HARQ) processes in the 52.6 GHz to 71GHz frequency band, particularly in unlicensed frequency bands, where the subcarrier interval increases and the maximum uplink HARQ process number exceeds 16, is not adequately addressed by existing technologies.
Innovation Solution
A method for transmitting Configured Grant-Downlink Feedback Information (CG-DFI) that determines a composition manner for HARQ-ACK information, allowing for the transmission of HARQ-ACK feedback for up to 256 processes, using various methods such as direct reflection, logical operations, or selective feedback based on continuous HARQ process identifiers, ensuring accurate and efficient HARQ-ACK information delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the subcarrier interval increases to 480kHz or 960kHz in the 52.6 GHz to 71GHz frequency band, then the data transmission capacity and frequency efficiency are improved, but the maximum uplink HARQ process number increases beyond 16, making it difficult to provide comprehensive feedback for all HARQ processes
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts, each corresponding to different HARQ process groups. This allows the feedback information to be divided and transmitted across multiple uplink slots, ensuring that all HARQ processes receive timely feedback even when the total number exceeds 16. The segmentation resolves the contradiction by distributing the feedback load across time slots rather than requiring single-slot transmission of all feedback.
Solution Approach 2:
The patent introduces a time dimension by distributing HARQ-ACK feedback across multiple uplink slots rather than confining it to a single slot. This multi-slot transmission approach adds a temporal dimension to the feedback mechanism, allowing comprehensive coverage of all HARQ processes while maintaining the high subcarrier interval benefits for data transmission capacity.
2Duration of action of moving object
If the round trip time corresponds to more slots (e.g., 64 slots), then the system supports longer transmission distances and higher frequencies, but it requires support for more parallel HARQ processes, increasing system complexity
Solution Approach 1:
The patent segments the large number of HARQ processes into multiple groups, with each group assigned to specific uplink slots. This segmentation reduces the complexity of managing 64 parallel HARQ processes by organizing them into manageable subsets, where each subset can be handled independently in its designated time slot, thereby reducing overall system complexity while supporting the required RTT duration.
Solution Approach 2:
The patent employs preliminary scheduling where uplink slots are pre-configured and associated with specific HARQ process groups before actual data transmission begins. This preliminary organization of HARQ processes into time-slot assignments simplifies the real-time feedback mechanism, reducing the operational complexity of managing numerous parallel HARQ processes during active communication.
3Reliability
If configured grant-downlink feedback information is introduced in unlicensed frequency bands, then user equipment can receive feedback on uplink data, but the existing feedback mechanisms are insufficient when the maximum uplink HARQ process number exceeds 16
Solution Approach 1:
The patent implements a dynamic feedback mechanism where the HARQ-ACK codebook structure and transmission timing are adapted based on the actual number of HARQ processes and available uplink slots. This dynamic approach allows the system to flexibly adjust the feedback distribution across multiple slots, ensuring reliable delivery for up to 64 HARQ processes while maintaining adaptability to different communication scenarios and channel conditions.
Solution Approach 2:
The patent changes key parameters of the feedback mechanism, including the codebook size, transmission slot allocation, and HARQ process grouping, to accommodate scenarios where the maximum uplink HARQ process number exceeds 16. By dynamically adjusting these parameters based on system conditions, the feedback mechanism maintains both reliability and adaptability across diverse operating scenarios.
Data Source
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AI summary
Provided in the present disclosure are a method and apparatus for transmitting configured grant-downlink feedback information, CG-DFI, and a readable storage medium. The method comprises: determining a CG-DFI composition manner, wherein the maximum number of uplink HARQ processes corresponding to the composition manner is greater than 16; and sending, to a user equipment, CG-DFI which conforms to the composition manner. By means of the present disclosure, when the maximum number of uplink HARQ processes is greater than 16, a corresponding CG-DFI composition manner is set, and CG-DFI which conforms to the composition manner is constructed according to the composition manner, and the CG-DFI which conforms to the composition manner is sent to a user equipment 101, such that in an application scenario where the maximum number of uplink HARQ processes is greater than 16, the CG-DFI which conforms to the composition manner is enabled to reflect HARQ-ACK information of all or some of the uplink HARQ processes from among all up link HARQ processes that correspond to the maximum number of uplink HARQ processes.