HARQ-ACK Codebook Segmentation for 5G Carrier Aggregation
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in efficiently scheduling multiple downlink transmissions and reporting acknowledgement information, particularly in carrier aggregation scenarios, which affects reception reliability and increases overhead.
Innovation Solution
The method involves generating and transmitting hybrid automatic repeat request (HARQ) acknowledgement (ACK) codebooks for multiple cell sets, allowing for the combination of different HARQ-ACK codebook types and appending them to provide comprehensive acknowledgement information, thereby enhancing reception reliability and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple downlink transmissions are scheduled in carrier aggregation scenarios, then the capacity and throughput of the wireless system are improved, but the overhead for reporting acknowledgement information increases
Solution Approach 1:
The patent segments the acknowledgement reporting by dividing cells into first set of cells and second set of cells, with each set having its own HARQ-ACK codebook type configuration. This allows separate handling of different cell groups, reducing the overall overhead by avoiding redundant acknowledgement information in unified codebooks.
Solution Approach 2:
The patent enables dynamic selection of HARQ-ACK codebook types (first type or second type) for different cell sets based on configuration information. This dynamic approach allows the system to adapt the acknowledgement overhead to the actual scheduling needs, improving efficiency when multiple downlink transmissions are scheduled across carrier aggregation cells.
2Reliability
If comprehensive acknowledgement information is reported for all cells, then the reception reliability is improved, but the complexity of the acknowledgement codebook increases
Solution Approach 1:
The patent divides the cell set into first set of cells and second set of cells, each with independent HARQ-ACK codebook type configurations. This segmentation allows comprehensive acknowledgement coverage across all cells while managing codebook complexity by treating different cell groups separately with appropriate codebook types.
Solution Approach 2:
The patent applies different HARQ-ACK codebook types (first type or second type) to different cell sets based on their specific requirements. This local quality approach ensures that each cell group uses the most appropriate codebook type for its characteristics, maintaining high reception reliability while minimizing unnecessary complexity in each local context.
3Adaptability or versatility
If different HARQ-ACK codebook types are used for different cell sets, then the flexibility and adaptability are improved, but the difficulty of managing and coordinating codebooks increases
Solution Approach 1:
The patent establishes a universal framework where a single downlink grant can schedule multiple downlink transmissions across different cell sets, each with different HARQ-ACK codebook types. This multi-functionality allows the same scheduling mechanism to handle diverse codebook configurations, improving flexibility while the base station maintains centralized coordination to manage the complexity.
Solution Approach 2:
The patent incorporates feedback mechanisms where the base station receives HARQ-ACK information organized according to the configured codebook types for different cell sets. This feedback structure allows the base station to coordinate and manage the multiple codebooks efficiently, translating the adaptability of different codebook types into actionable scheduling decisions while controlling management complexity.
Data Source
AI summary
Methods and apparatuses for scheduling multiple downlink transmissions. A method for operating a user equipment to provide hybrid automatic repeat request acknowledgement (HARQ-ACK) information includes receiving information for a first HARQ-ACK codebook type and a second HARQ-ACK codebook type and information for a first set of cells and a second set of cells. The method further includes generating a first HARQ-ACK codebook, according to the first HARQ-ACK codebook type, that includes first HARQ-ACK information associated with first receptions on cells from the first set of cells; a second HARQ-ACK codebook, according to the second HARQ-ACK codebook type, that includes second HARQ-ACK information associated with second receptions on cells from the second set of cells; and a HARQ-ACK codebook by appending the second HARQ-ACK codebook to the first HARQ-ACK codebook. The method further includes transmitting a channel that provides the HARQ-ACK codebook.