5G Radio Link State Detection Through Reference Signal Feedback
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Solution Overview
Problem
In a 5G mobile communications system, the uncertainty of channel availability in unlicensed frequency bands due to contention-based access modes leads to inaccurate determination of radio link states, affecting information transmission between network devices and terminals.
Innovation Solution
A method for determining radio link state by performing detection on target reference signals and analyzing detection results to accurately identify undetected signals, using quality parameters and quantities to report precise radio link state indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention-based distributed coordination access mode is used in unlicensed frequency band, then channel sharing efficiency is improved, but channel availability becomes uncertain
Solution Approach 1:
The terminal performs clear channel assessment (CCA) or extended clear channel assessment (eCCA) before receiving reference signals to determine channel availability in advance. This preliminary action allows the terminal to prepare for potential reference signal reception failures by detecting channel status before the network device transmits reference signals, thereby addressing the uncertainty caused by contention-based access modes.
2Loss of information
If reference signal transmission is performed in unlicensed frequency band, then information transmission is enabled, but reference signal may not be sent due to channel not being detected as idle
Solution Approach 1:
The terminal feeds back the detection result of target reference signals to indicate whether the radio link state is that target reference signals are undetected. This feedback mechanism allows the terminal to inform the network device about the actual reference signal reception status, enabling the network to adjust transmission strategies and maintain reliable information communication despite the uncertainty introduced by contention-based access modes.
3Productivity
If terminal does not receive reference signal due to channel access constraints, then channel contention is avoided, but accurate radio link state determination cannot be performed
Solution Approach 1:
The terminal performs clear channel assessment (CCA) or extended clear channel assessment (eCCA) before expecting reference signals to be transmitted. This preliminary detection of channel status allows the terminal to anticipate potential reference signal reception failures and report accurate radio link state information, thereby maintaining measurement precision while still benefiting from efficient channel access through contention-based modes.
Solution Approach 2:
The terminal provides feedback information indicating whether target reference signals were detected or not. This feedback loop enables the terminal to compensate for any missed reference signals by explicitly reporting the undetected state, ensuring that radio link state determination remains accurate even when channel access constraints prevent reference signal reception.
Data Source
AI summary
A method for determining a radio link state and a terminal are provided. The method includes: performing detection for target reference signals on target resources configured by a network device, to obtain a detection result; and determining, based on the detection result of the target reference signals, whether a radio link state is that target reference signals are undetected.