Downlink Transmission in RRC Inactive State for IoT
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Solution Overview
Problem
Current 5G communication systems face inefficiencies in power consumption and signaling resource waste due to the need for traditional four-step random access processes for small packet data transmission, especially in IoT devices operating in RRC idling or inactive states, and challenges in determining random access preamble and data resource configurations.
Innovation Solution
A downlink transmission method for user equipment (UE) that includes receiving a predefined downlink signal in a predefined resource and performing HARQ-ACK feedback, allowing for downlink data transmission in RRC connected, idling, or inactive states by utilizing specific search spaces and resource configurations, such as PDSCH resources, to optimize data transmission and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional four-step random access process is used for small packet data transmission, then reliable data transmission is achieved, but power consumption increases and signaling resources are wasted
Solution Approach 1:
The patent applies preliminary action by pre-configuring downlink resources and signaling formats before the actual data transmission occurs. The network pre-allocates PDSCH resources, PDCCH monitoring configurations, and HARQ-ACK feedback resources in advance, allowing the UE to quickly activate transmission without going through the complete four-step random access procedure. This reduces power consumption while maintaining reliable transmission.
Solution Approach 2:
The patent extracts and separates the essential data transmission function from the complete four-step random access process. By identifying that small packet data transmission only requires downlink resource allocation and acknowledgment, the patent removes unnecessary steps (such as full uplink scheduling requests and complex handshaking), keeping only the critical components needed for efficient small data transmission.
2Reliability
If traditional four-step random access process is used for small packet data transmission, then reliable data transmission is achieved, but signaling resource waste occurs
Solution Approach 1:
The patent extracts and separates the essential data transmission function from the complete four-step random access process. By identifying that small packet data transmission only requires downlink resource allocation and acknowledgment, the patent removes unnecessary steps (such as full uplink scheduling requests and complex handshaking), keeping only the critical components needed for efficient small data transmission.
Solution Approach 2:
The patent applies preliminary action by pre-configuring downlink resources and signaling formats before the actual data transmission occurs. The network pre-allocates PDSCH resources, PDCCH monitoring configurations, and HARQ-ACK feedback resources in advance, allowing the UE to quickly activate transmission without going through the complete four-step random access procedure. This reduces power consumption while maintaining reliable transmission.
3Use of energy by moving object
If downlink data transmission is performed in RRC idling or inactive state, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously perform downlink data reception and HARQ-ACK feedback in RRC idle or inactive states without requiring network control or coordination. The UE independently monitors pre-configured PDCCH resources, receives PDSCH data, and transmits acknowledgments using pre-allocated uplink resources, eliminating the need for complex RRC state transitions and reducing device complexity.
4Use of energy by moving object
If HARQ-ACK feedback is transmitted in RRC idle or inactive state, then power consumption is reduced, but measurement precision challenges arise
Solution Approach 1:
The patent applies preliminary action by pre-configuring downlink resources and signaling formats before the actual data transmission occurs. The network pre-allocates PDSCH resources, PDCCH monitoring configurations, and HARQ-ACK feedback resources in advance, allowing the UE to quickly activate transmission without going through the complete four-step random access procedure. This reduces power consumption while maintaining reliable transmission.
Data Source
AI summary
The present disclosure relates to a communication method and 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). The present 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. A downlink transmission method performed by user equipment and user equipment are provided. The downlink transmission method performed by the user equipment includes: receiving a predefined downlink signal in a predefined downlink resource, and performing ACK feedback according to the received downlink signal, thereby implementing the performing of downlink data transmission in an RRC idling or inactive state, or establishing RRC connection more rapidly.