Grant-Free 5G Data Transmission with SPS and HARQ-ACK
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Solution Overview
Problem
Existing 5G communication systems face challenges in efficiently providing various services due to overlapping time-frequency resources, particularly in scenarios requiring low latency and high reliability, such as URLLC, leading to potential eMBB data transmission failures.
Innovation Solution
A method for grant-free data transmission and reception is introduced, utilizing semi-persistent scheduling (SPS) with hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback schemes to optimize resource utilization and prioritize services based on priority, including methods for configuring semi-static and dynamic HARQ-ACK codebooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grant-based scheduling is used to ensure reliable data transmission, then transmission reliability is improved, but transmission latency increases and resource efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring semi-persistent scheduling (SPS) resources in advance for future transmissions. The network device configures SPS parameters including time-frequency resources, modulation and coding schemes, and HARQ processes beforehand, allowing immediate data transmission without waiting for dynamic grant allocation, thus reducing latency while maintaining reliability through pre-planned resource allocation
Solution Approach 2:
The patent implements dynamics by introducing dynamic HARQ-ACK feedback mechanisms that allow real-time adjustment of SPS transmissions. The receiving device sends HARQ-ACK feedback to indicate whether data was successfully decoded, enabling the transmitting device to dynamically retransmit or adjust parameters based on actual channel conditions, thereby maintaining high reliability without requiring continuous grant-based scheduling
2Productivity
If more time-frequency resources are allocated for data transmission, then transmission capacity is improved, but resource overlap increases leading to transmission failures
Solution Approach 1:
The patent applies segmentation by dividing the time-frequency resources into multiple orthogonal SPS configurations with distinct resource allocations. Each SPS configuration operates on separately allocated time slots, frequency bands, or spatial layers, preventing resource overlap between different SPS instances while maintaining high overall transmission capacity through efficient resource partitioning
Solution Approach 2:
The patent implements feedback through HARQ-ACK mechanisms where the receiving device sends acknowledgment feedback for each SPS transmission. This feedback loop allows the transmitting device to detect transmission failures caused by resource overlap or poor channel conditions and initiate retransmissions, thereby maintaining high transmission success rates even when operating at high capacity with dense resource allocation
3Productivity
If semi-persistent scheduling is configured for multiple services, then resource utilization is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a unified SPS framework that can simultaneously support multiple services with different requirements (e.g., eMBB, URLLC) through a common configuration and management mechanism. The same SPS infrastructure handles diverse traffic types by configuring appropriate parameters for each service, avoiding the need for separate scheduling systems and reducing overall complexity while maintaining high resource utilization
Solution Approach 2:
The patent implements parameter changes by allowing dynamic adjustment of SPS configuration parameters such as periodicity, time-frequency resource allocation, modulation and coding schemes, and HARQ process numbers based on service requirements. This flexibility enables the system to optimize resource utilization for different services without increasing structural complexity, as all services operate within the same SPS framework with adaptable parameters
Data Source
AI summary
The disclosure relates to a communication technique that converges a 5th generation (5G) communication system for supporting a higher data rate after a 4th generation (4G) system with Internet of things (IoT) technology, and a system thereof. The disclosure can be applied to intelligent services (e.g., smart home, smart building, smart city, smart or connected car, healthcare, digital education, retail, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. A method and apparatus for performing unauthorized-based communication and hybrid automatic repeat request acknowledgement (HARQ-ACK) information transmission therefor are provided.