5G Uplink HARQ-ACK Codebook Configuration for URLLC
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently providing various services due to the need for accurate channel state measurement and separate frequency resource group-level support for different service categories like eMBB, mMTC, and URLLC, especially in scenarios requiring low latency and high reliability.
Innovation Solution
The implementation of a method for configuring semi-static and dynamic HARQ-ACK codebooks in the 5G NR system, allowing for efficient HARQ-ACK feedback transmission, particularly in scenarios where PUCCH and PUSCH channels overlap, to enhance reliability and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate frequency resource group-level support is provided for different service categories (eMBB, mMTC, URLLC), then service-specific optimization is improved, but device complexity and measurement overhead increase
Solution Approach 1:
The frequency resources are segmented into different frequency resource groups (FRGs) based on service categories. Each FRG is configured with specific parameters (such as subcarrier spacing, numerology) suitable for particular service types like eMBB, mMTC, or URLLC. This segmentation enables service-specific optimization while maintaining a unified channel state measurement framework, thus resolving the contradiction between adaptability and complexity.
2Reliability
If accurate channel state measurement is performed for each service category, then service reliability is improved, but transmission time and latency increase
Solution Approach 1:
Channel state information is measured and prepared in advance for different frequency resource groups based on configured service categories. The gNodeB pre-configures FRGs with appropriate channel state measurement parameters, enabling rapid selection and utilization during actual data transmission. This preliminary preparation reduces real-time measurement time while maintaining high reliability through accurate channel state knowledge.
Solution Approach 2:
The system dynamically selects and switches between different frequency resource groups based on current service requirements and channel conditions. When a service category changes or channel conditions vary, the system can quickly transition to the appropriate FRG with pre-measured channel state information, reducing latency while maintaining reliability through adaptive resource allocation.
3Area of stationary object
If beamforming and advanced antenna techniques are deployed to increase transmission distance, then coverage area is improved, but device complexity and cost increase
Solution Approach 1:
The frequency resource group configuration framework provides a universal approach that can accommodate multiple antenna techniques and beamforming configurations within a single system. Different FRGs can be configured to support various service categories, each with optimized antenna parameters, allowing the system to achieve extended coverage through multi-functionality rather than requiring separate dedicated systems for each service type.
4Productivity
If advanced coding modulation (ACM) and advanced access technology (NOMA, SCMA) are implemented, then data rate is improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The system changes parameters such as modulation schemes, coding rates, and access methods based on the selected frequency resource group and service category. By configuring different FRGs with appropriate parameter sets (e.g., FQAM for eMBB, ACM for URLLC), the system can achieve high data rates through parameter optimization rather than requiring complex unified implementations, thus reducing overall system complexity while maintaining high productivity.
Data Source
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AI summary
A communication method and a system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure provides a method and an apparatus for an uplink transmission process.