NR Random Access Node Selection for Higher Access Success
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Solution Overview
Problem
In a New Radio (NR) system with multiple transmission nodes configured for a serving cell, the existing random access processes are inadequate for efficiently handling random access operations.
Innovation Solution
A method and system for configuring terminals to perform random access processes based on multiple transmission nodes, using first configuration information to initiate the process on a target transmission node, and network devices sending configuration information to facilitate this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission nodes are configured for one serving cell, then the coverage and reliability of the network are improved, but the complexity of the random access process increases
Solution Approach 1:
The random access process is segmented into distinct phases: selection of target transmission node, determination of random access type, and execution of access procedure. This segmentation allows the terminal to systematically handle multiple transmission nodes without being overwhelmed by the overall complexity, addressing the contradiction by breaking down the complex process into manageable segments.
Solution Approach 2:
The random access process dynamically adapts based on the number of transmission nodes and their configurations. The terminal can flexibly select between 2-step and 4-step RACH processes, and dynamically choose target transmission nodes based on current network conditions and configuration information, thereby maintaining reliability while managing complexity through dynamic decision-making.
2Reliability
If the terminal selects from multiple transmission nodes, then the probability of successful random access is improved, but the decision-making complexity and time consumption increase
Solution Approach 1:
The network side performs preliminary actions by pre-configuring multiple transmission nodes with distinct random access resource configurations before the terminal needs to make decisions. This advance preparation provides the terminal with ready-to-use configuration information, reducing the time and computational effort required for real-time selection decisions while maintaining high success probability.
Solution Approach 2:
The terminal autonomously selects the target transmission node based on pre-configured information and current measurements without requiring extensive network assistance or complex coordination. This self-service approach minimizes decision time and signaling overhead while achieving reliable random access through intelligent local decision-making.
3Measurement precision
If different random access resource configurations are provided for different transmission nodes, then the precision of random access is improved, but the configuration complexity increases
Solution Approach 1:
Each transmission node is assigned distinct local qualities in terms of random access resource configurations (e.g., different time-frequency resources, different RACH occasions). This local differentiation allows the terminal to precisely match its random access attempt to the appropriate transmission node based on measured signal qualities and configuration parameters, achieving high precision while the network manages configuration complexity through systematic allocation.
Solution Approach 2:
The configuration mechanism is designed to be universal and scalable, allowing the same framework to support any number of transmission nodes with distinct configurations. The terminal uses a unified approach to process configuration information and select target nodes, while the network applies consistent configuration rules across multiple nodes, reducing overall complexity through standardization.
Data Source
AI summary
A random access method, a random access processing method, a terminal, and a network device. The method includes: receiving first configuration information, where the first configuration information is used for indicating a related configuration for performing a random access process based on a target transmission node; and initiating the random access process to the target transmission node based on the first configuration information. The terminal is configured with a target object corresponding to N transmission nodes, the target object is a serving cell or a bandwidth part, and N is an integer greater than 1. The target transmission node is any one of the N transmission nodes.