Grant-Free Data Transmission in 5G IoT Systems
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Solution Overview
Problem
Existing 5G communication systems face challenges in efficiently managing radio resources for grant-free-based data transmission, particularly in scenarios requiring low latency and high reliability.
Innovation Solution
The proposed method involves a UE receiving a higher-layer signal with information for a semi-persistent scheduling (SPS) configuration from a BS, activating the SPS configuration with downlink control information (DCI), and transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information through a physical uplink control channel (PUCCH) at designated time points based on the SPS configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grant-free-based data transmission is used to meet low latency and high reliability requirements, then transmission speed and reliability are improved, but radio resource management efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by configuring semi-persistent scheduling (SPS) parameters in advance through higher-layer signaling. The SPS configuration includes pre-setting transmission periodicity, resource allocation patterns, and HARQ-ACK feedback timing, allowing the UE to transmit data without requiring dynamic grant allocation for each transmission occasion, thus improving reliability while maintaining resource management efficiency
Solution Approach 2:
The patent implements feedback mechanisms through HARQ-ACK information transmission. The UE transmits HARQ-ACK feedback on PUCCH at designated time points to inform the BS about the reception status of SPS data, enabling the BS to adjust future transmissions and optimize radio resource allocation, thereby resolving the contradiction between transmission reliability and resource management efficiency
2Productivity
If semi-persistent scheduling configuration is applied to enable periodic data transmission, then radio resource usage efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the scheduling configuration into distinct components: higher-layer SPS configuration parameters, DCI activation signaling, and periodic transmission occasions. This segmentation allows the complex SPS mechanism to be managed through modular, manageable units, reducing the perceived system complexity while maintaining high radio resource usage efficiency
Solution Approach 2:
The patent makes the SPS configuration universal by enabling it to handle multiple transmission scenarios through a single configuration framework. The same SPS configuration can support different data types, transmission periodicities, and service requirements, reducing the need for separate specialized mechanisms and thereby simplifying the overall system
3Reliability
If HARQ-ACK information is transmitted at multiple time points to ensure reliable feedback, then feedback reliability is improved, but transmission time consumption increases
Solution Approach 1:
The patent applies periodic action by transmitting HARQ-ACK feedback at designated time points according to the SPS configuration periodicity. Instead of continuous or multiple simultaneous feedback transmissions, the system uses periodic feedback opportunities that are synchronized with the data transmission schedule, ensuring reliable feedback while minimizing time consumption through efficient time multiplexing
Data Source
AI summary
The present disclosure relates to a communication technique for merging, with an IoT technology, a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security-and safety-related services, and the like) on the basis of a 5G communication technology and an IoT-related technology. The present disclosure discloses a method and apparatus for transmitting and receiving downlink grant-free-based data.