2-Step Random Access Preamble Group Selection for 5G IoT
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The 5G wireless communication system faces challenges in efficiently managing random access procedures, particularly in scenarios where contention-free resources are not configured, leading to suboptimal performance in data transmission and increased latency.
Innovation Solution
A method and system for a 2-step random access procedure in wireless communication systems, where a terminal identifies the need for contention-free resources, selects the appropriate preamble group for transmission, and transmits a message on the physical random access channel (PRACH) and physical uplink shared channel (PUSCH) to the base station, ensuring efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If contention-free random access resources are not configured, then device complexity is reduced, but data transmission efficiency deteriorates and latency increases
Solution Approach 1:
The base station pre-configures preamble groups and their associations with downlink beams before random access occurs. This preliminary configuration enables the terminal to efficiently select appropriate preambles based on beam measurements without requiring complex real-time resource allocation, thus maintaining low device complexity while improving data transmission efficiency through optimized random access procedure
Solution Approach 2:
The terminal measures downlink reference signals associated with different beams, selects preambles from appropriate preamble groups based on measurement results, and transmits them accordingly. This feedback mechanism allows the system to adapt to channel conditions and beam configurations, improving data transmission efficiency without significantly increasing device complexity at the terminal side
2Quantity of substance
If contention-free random access resources are not configured, then resource allocation overhead is reduced, but latency increases
Solution Approach 1:
The random access preambles are divided into multiple preamble groups, each associated with specific downlink beams. This segmentation allows terminals to quickly identify and select from relevant preamble groups based on beam measurements, reducing the time required for random access without requiring extensive contention-free resources. The segmentation enables efficient resource utilization while minimizing access latency
Solution Approach 2:
The system changes the parameter of preamble selection by introducing beam-associated preamble groups and using downlink reference signal measurements as selection criteria. This parameter change enables the terminal to make informed preamble selections that align with current channel conditions, reducing random access latency without increasing resource allocation overhead
3Length of stationary object
If beamforming and massive MIMO are used to increase transmission distance, then coverage is improved, but device complexity and processing requirements increase
Solution Approach 1:
The base station performs beamforming and transmits downlink reference signals across multiple beams before the terminal needs to access the network. The terminal measures these pre-transmitted reference signals and selects preambles based on the measurements. This preliminary beamforming action enables long-distance transmission coverage while keeping terminal device complexity low, as the terminal only needs to measure and select, not generate or manage complex beamforming operations
Solution Approach 2:
The terminal autonomously measures downlink reference signals, determines the appropriate beam, and selects preambles from the corresponding preamble group without requiring complex base station coordination during the random access procedure. This self-service approach allows the terminal to benefit from beamforming-enhanced coverage while maintaining simple terminal device complexity
Data Source
AI summary
A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system 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 method for performing a random access procedure in a wireless communication system is provided.