HARQ-ACK Codebook Segmentation for Low-Latency PUCCH Feedback
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Solution Overview
Problem
The 5G wireless communication system faces challenges in efficiently transmitting control and data information, particularly for services requiring high reliability and low latency like URLLC, due to varying channel and interference characteristics, and the need for improved methods to handle carrier aggregation and different TDD configurations in carrier aggregation scenarios.
Innovation Solution
The method involves constructing a HARQ-ACK codebook to enable transmission of multiple HARQ-ACKs in one slot, allowing PUCCH transmission in a carrier aggregation scenario, and optimizing PUCCH resource allocation across different TDD structures to minimize latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple HARQ-ACK transmissions are performed in one slot, then the reliability of control information transmission is improved, but the device complexity increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts or groups, allowing separate transmission of different HARQ-ACK information in the same slot. This segmentation enables reliable transmission of multiple acknowledgments without requiring a single complex transmission mechanism, thus improving reliability while managing device complexity.
Solution Approach 2:
The patent utilizes multiple dimensions for HARQ-ACK transmission including different frequency resources, time resources within the same slot, and spatial layers. By transitioning from a single-dimension transmission approach to multi-dimensional resources, the system can transmit multiple HARQ-ACKs simultaneously, improving reliability without proportionally increasing device complexity.
2Loss of time
If PUCCH resource allocation is optimized across different TDD structures, then the latency is reduced, but the adaptability requirements increase
Solution Approach 1:
The patent implements dynamic PUCCH resource allocation that adapts to different TDD configurations. The system dynamically selects appropriate PUCCH resources based on the specific TDD structure being used, enabling low-latency transmission tailored to each configuration. This dynamic approach reduces latency by optimizing resource allocation for each TDD scenario while managing adaptability requirements through standardized selection criteria.
Solution Approach 2:
The patent changes key parameters such as PUCCH start symbol, frequency location, and resource allocation patterns based on different TDD configurations. By adjusting these parameters dynamically according to the TDD structure, the system achieves low latency transmission adapted to various scenarios without requiring complete redesign for each configuration.
3Adaptability or versatility
If carrier aggregation is supported with different TDD configurations, then the versatility of the system is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent introduces intermediary reference signals and measurement resources that facilitate channel detection and measurement across aggregated carriers with different TDD configurations. These intermediary elements act as mediators between the diverse carrier configurations and the terminal's measurement capabilities, enabling accurate channel quality assessment without directly exposing the complexity of multiple TDD structures.
Solution Approach 2:
The patent implements universal measurement and detection mechanisms that work across different carrier aggregation scenarios with varying TDD configurations. By creating multi-functional detection procedures and reference signal designs that serve multiple purposes and configurations, the system reduces the difficulty of detecting and measuring channel characteristics while maintaining high versatility.
Data Source
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AI summary
The present disclosure relates to a communication technique that combines a 5G communication system for supporting a higher data transmission rate than a 4G system with IoT technology, and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safetyrelated services, etc.) on the basis of 5G communication technology and IoT-related technology. Furthermore, the present disclosure provides a method and device for transmitting HARQ-ACK feedback for downlink data transmission. Specifically, disclosed are a method for configuring HARQ-ACK feedback bits when a terminal intends to transmit multiple HARQ-ACKs within one slot through an uplink, and a device therefor.