Random Access Resource Determination via Beam Alignment
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Solution Overview
Problem
In current new radio (NR) technology, there is no appropriate method for determining a random access resource, leading to inefficient random access processes due to beam mismatch issues when terminals transmit random access signals.
Innovation Solution
A method where terminals receive indication information to determine a random access resource based on a random access configuration index and an association relationship with downlink signals, allowing for precise transmission of random access preambles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal blindly tries a random access resource when transmitting a random access signal, then the terminal can transmit the random access signal without complex resource determination, but a beam mismatch may occur when the base station receives the random access signal, resulting in low efficiency of the random access process
Solution Approach 1:
The network device performs preliminary action by indicating the random access configuration index to the terminal before the random access process. The terminal uses this index to determine the appropriate random access resource in advance, avoiding blind transmission and ensuring beam alignment between the terminal and base station, thereby resolving the contradiction between operational simplicity and access efficiency
Solution Approach 2:
The network device provides feedback to the terminal through the random access configuration index, which contains information about the association relationship between random access resources and downlink signals. This feedback enables the terminal to select the correct random access resource without blind trial, improving random access efficiency while maintaining simple terminal operation
2Device complexity
If no appropriate method is available for determining a random access resource, then the terminal can transmit the random access signal without complex resource determination procedures, but beam mismatch occurs when the base station receives the random access signal, leading to low random access efficiency
Solution Approach 1:
The random access configuration index serves as an intermediary between the network device and the terminal. It carries information about the association relationship between random access resources and downlink signals, enabling the terminal to determine the correct random access resource without complex procedures. This intermediary mechanism resolves the contradiction by providing a simple yet effective resource determination method that ensures beam alignment and improves random access efficiency
Data Source
AI summary
This application provides a random access method and apparatus. The method includes: receiving, by a terminal, first indication information transmitted by a network device, where the first indication information is used to indicate a random access configuration index; determining, by the terminal, a random access resource based on the random access configuration index; determining, based on an association relationship between the random access resource and a downlink signal, a random access resource corresponding to the downlink signal; and transmitting a random access preamble to the network device based on the random access resource corresponding to the downlink signal.