Two-Step Random Access for Small Data Transmission in 5G IoT
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently transmitting user data with small sizes through random access processes, particularly in scenarios where early data transmission (EDT) is not supported, leading to inefficiencies in data handling and network resource allocation.
Innovation Solution
A method is introduced where user equipment (UE) and base stations implement a two-step random access process, allowing for the transmission of user data with sizes smaller than a predetermined threshold, including support for early data transmission (EDT), by exchanging specific messages (msgA and msgB) that include uplink and downlink data, enabling efficient data transfer without switching to a connected mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional four-step random access process is used, then the procedure is simple and well-established, but data transmission efficiency is low and latency is high when EDT is not supported
Solution Approach 1:
The patent segments the random access process into two distinct stages: a first stage for preamble transmission and initial data exchange, and a second stage for continued data transmission. This segmentation allows the system to handle small data packets efficiently without requiring full connection establishment, thereby improving data transmission efficiency while managing process complexity through structured division of operations.
Solution Approach 2:
The patent implements preliminary action by allowing the UE to transmit data in the first random access stage before full connection establishment is completed. The base station can receive and process data packets during the random access procedure itself, rather than waiting for connection setup, thus reducing latency and improving efficiency for small data transmissions.
2Reliability
If EDT is supported with two-step random access, then data transmission efficiency is improved, but system complexity increases due to additional message exchanges and control mechanisms
Solution Approach 1:
The patent applies universality by designing the two-step random access process to handle multiple functions: the first stage handles preamble transmission and initial data exchange, while the second stage handles continued data transmission and connection establishment. This multi-functional design improves reliability for various data transmission scenarios while managing complexity through a unified process framework that can adapt to different data sizes and transmission requirements.
Solution Approach 2:
The patent implements feedback mechanisms where the base station sends responses to UE transmissions at each stage. The first stage includes base station responses to preamble transmissions, and the second stage includes acknowledgments and control information for data packets. This feedback ensures reliable data transmission by allowing the UE to adjust its transmission based on base station responses, thereby improving reliability while managing complexity through structured feedback loops.
3Loss of time
If traditional random access is used without EDT, then network resource allocation is simple, but latency is high and network resources are not optimized
Solution Approach 1:
The patent applies dynamics by enabling the random access process to adapt to different data transmission scenarios. The two-stage process allows dynamic adjustment of transmission parameters, data packet sizes, and timing based on real-time network conditions and UE requirements. This dynamic approach reduces latency by allowing faster data transmission for small packets while maintaining simplicity for larger data transfers, balancing performance improvement with manageable complexity.
Data Source
AI summary
Disclosed are: a communication technique for merging, with IoT technology, a 5th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) communication system such as long term evolution (LTE); and a system therefor. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety-related services, and the like) on the basis of 5G communication technology and IoT-related technology. According to various embodiments of the present invention, provided are a method and a device for transmitting user data through a two-step random access process in a mobile communication system.