Radio Link Monitoring Using Reference Signals for Multi-Carrier V2V
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Solution Overview
Problem
Current radio link monitoring methods in vehicle-to-vehicle (V2V) wireless communication systems face challenges in efficiently assessing radio link quality across multiple frequency bands, particularly in high-frequency bands used for 5G communication, leading to potential beam mismatch and delayed data transmission due to rapid signal attenuation and mobility.
Innovation Solution
A method and apparatus for radio link monitoring (RLM) that utilize a reference signal to measure radio link quality, allowing determination of wireless communication feasibility across multiple carriers, with the option to transmit data on higher frequency bands once communication is established, using a combination of synchronization signal blocks (SSBs) and beamforming techniques to manage beam pairs effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency bands are used for data transmission to increase data rates, then data transmission rate is improved, but signal attenuation increases and communication stability deteriorates
Solution Approach 1:
The system divides frequency bands into control band (lower frequency) and data band (higher frequency), assigning different functions to different frequency segments. Control information is transmitted on the more stable lower frequency band while data transmission occurs on the higher frequency band, resolving the contradiction between data rate and stability.
Solution Approach 2:
The lower frequency band acts as an intermediary for control information that mediates the connection between transmitter and receiver. By establishing control links on stable lower frequencies first, the system can then safely utilize higher frequency bands for high-rate data transmission, with the control channel serving as a stabilizing intermediary.
2Reliability
If beamforming techniques are implemented to manage beam pairs in V2V communication, then communication reliability is improved, but beam pairing time increases
Solution Approach 1:
The system performs preliminary beam pairing and establishment of control channels before high-rate data transmission begins. By pre-establishing the control link and beam pair on lower frequency bands, the time-consuming beam pairing operation is completed in advance, allowing rapid data transmission to follow without repeated beam searching.
Solution Approach 2:
The system dynamically switches between frequency bands based on communication phase: using lower bands for control and beam management, then transitioning to higher bands for data transmission. This dynamic frequency selection optimizes both reliability during beam pairing and efficiency during data transmission.
Data Source
AI summary
The present disclosure provides a method for performing radio link monitoring (RLM) by a terminal for which a plurality of carriers are configured, in a wireless communication system. Specifically, the method may comprise: receiving a reference signal through one carrier among the plurality of carriers: measuring the radio link quality of the one carrier on the basis of the reference signal, and determining whether wireless communication through the plurality of carriers is possible, on the basis of the measured radio link quality.