RA Attempt Reporting on SSB and CSI-RS for NR-U Access Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In New Radio Unlicensed (NR-U) systems, terminal devices do not support reporting random access (RA) attempt related information on reference signals like synchronization signal blocks (SSB) or channel state information reference signals (CSI-RS) to network-side devices, which is crucial for successful RA preambles, especially when listen-before-talk (LBT) fails.
Innovation Solution
The terminal device reports RA attempt related information on reference signals, such as SSB or CSI-RS, to the network-side device when sending a RA preamble, including successful or unsuccessful attempts, with or without LBT, to enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device does not support reporting RA attempt related information on reference signals, then the device complexity is reduced, but the reliability of random access is worsened due to lack of feedback information
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device reports RA attempt related information (such as LBT failure status, RA preamble sending status) to the network-side device. This feedback enables the network to understand the random access status and adjust scheduling decisions accordingly, improving random access reliability without requiring complex additional hardware.
Solution Approach 2:
The terminal device performs preliminary actions by recording RA attempt information (LBT status, preamble sending status) before the random access process completes. This preliminary information collection enables subsequent reporting to the network, allowing the network to make informed scheduling decisions without requiring complex real-time feedback mechanisms during the actual transmission.
2Productivity
If the terminal device reports detailed RA attempt information, then the network can improve scheduling accuracy, but the information overhead increases
Solution Approach 1:
The patent extracts only the essential RA attempt related information (such as LBT failure status, RA preamble sending status, and associated reference signal indicators) from the complete random access process. By taking out only the critical information elements, the network receives sufficient data for scheduling decisions without being overwhelmed by unnecessary detailed information, thus balancing scheduling efficiency with information overhead.
Solution Approach 2:
The reporting mechanism applies local quality by providing detailed RA attempt information only for specific reference signals (SSB or CSI-RS) that are relevant to the current access attempt, rather than reporting all possible random access details. This selective reporting approach ensures the network receives targeted information for accurate scheduling while minimizing overall information overhead.
Data Source
AI summary
An information reporting method is performed by a terminal device and includes: reporting, in response to sending a random access (RA) preamble by using a RA resource associated with a reference signal, RA attempt related information on the reference signal to a network-side device, wherein the reference signal includes a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS).