Multi-Cell Scheduling With Structured HARQ-ACK Bit Allocation
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signal transmission and reception procedures, particularly in handling multi-cell scheduling and hybrid automatic repeat request-acknowledgment (HARQ-ACK) processes, which affect the accuracy and efficiency of data transmission.
Innovation Solution
A method and apparatus for wireless communication systems that enable multi-cell scheduling by determining the number of acknowledgement/negative-acknowledgement (ACK/NACK) bits based on the maximum number of cells or transport blocks co-scheduled by downlink control information (DCI), using spatial bundling and sub-codebooks to arrange HARQ-ACK information, and supporting efficient HARQ-ACK transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multi-cell scheduling is implemented to increase data transmission capacity, then the quantity of data transmitted increases, but the complexity of scheduling and HARQ-ACK management increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple groups, where each group corresponds to a specific cell or set of cells. This segmentation allows the system to manage HARQ-ACK feedback for multiple cells in an organized manner, reducing the overall complexity of multi-cell scheduling while maintaining high data transmission capacity.
Solution Approach 2:
The patent introduces a new dimension for organizing HARQ-ACK feedback by grouping acknowledgments according to cell indices and transport block numbers. This dimensional organization transforms the complex multi-cell scheduling problem into a more manageable structured format, enabling efficient tracking and management of multiple simultaneous transmissions.
2Measurement precision
If the number of ACK/NACK bits is increased to support more cells and transport blocks, then the accuracy of HARQ-ACK information increases, but the overhead of uplink control information increases
Solution Approach 1:
The patent establishes predetermined rules for determining the number of ACK/NACK bits based on the maximum number of cells and transport blocks that can be scheduled. This preliminary determination allows the system to allocate the exact number of bits needed without excessive overhead, while still supporting flexible multi-cell scheduling. The bit allocation is decided in advance based on configuration parameters rather than being dynamically adjusted for each transmission.
3Productivity
If flexible multi-cell scheduling is enabled to improve resource utilization, then productivity increases, but the difficulty of detecting and measuring scheduling status increases
Solution Approach 1:
The patent implements a feedback mechanism where the number of ACK/NACK bits is determined based on the maximum configurable cells and transport blocks. This feedback approach ensures that the receiving end can accurately detect and measure the scheduling status by knowing in advance how many acknowledgment bits to expect, even when the actual number of scheduled cells varies. The downlink assignment index further aids in tracking the scheduling status across multiple cells.
Data Source
AI summary
According to at least one of various embodiments, DCI may be received through a PDCCH; at least one TB may be received through a PDSCH in at least one of a plurality of cells configured in a user equipment on the basis of the DCI; and HARQ-ACK information for the at least one TB may be transmitted, wherein the DCI may support multi-cell scheduling on the basis of the plurality of cells, and the number of ACK/NACK bits included in the HARQ-ACK information may be determined on the basis of at least one of a maximum number of cells that can be scheduled together by the DCI or a maximum number of TBs that can be received through cells scheduled together by the DCI.