Terminal Link Reconfiguration via QCL Reference Signal Detection
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Solution Overview
Problem
Current wireless communication systems face challenges in maintaining link reliability due to link failures caused by barriers and poor diffraction capabilities on high-frequency channels, leading to interruptions in signal transmission, particularly in receiving physical downlink control channels (PDCCH) and shared channels (PDSCH) during link reconfiguration.
Innovation Solution
A method involving a terminal device that sends link reconfiguration request information to a network device, using quasi co-location (QCL) assumption information to detect and receive PDCCH and PDSCH signals by identifying reference signals with good channel quality, ensuring continued communication during link reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beamforming technology is used to mitigate propagation path loss, then transmission distance increases, but link reliability deteriorates when beams are blocked by barriers
Solution Approach 1:
The terminal device performs beam failure detection by monitoring reference signals before actual communication failure occurs. When the quality of reference signals falls below a threshold, the terminal proactively initiates beam failure recovery procedures, including sending failure recovery requests and switching to candidate beams, thereby preventing complete link interruption and maintaining reliability while preserving transmission distance benefits.
2Object-generated harmful factors
If a single beam is used for communication, then interference to peer receive end is reduced, but communication is interrupted abruptly when the beam is blocked
Solution Approach 1:
The system combines multiple beams (primary beam and candidate beams) into a unified communication framework. The terminal monitors multiple reference signals corresponding to different beams and maintains readiness to switch between them. This merging of multiple beam options allows the system to reduce interference through directional transmission while ensuring communication continuity through beam diversity, resolving the contradiction between interference reduction and communication continuity.
3Reliability
If link reconfiguration is initiated to recover from beam failure, then communication continuity is improved, but data transmission is interrupted during the reconfiguration time period
Solution Approach 1:
The terminal device performs preliminary actions by pre-identifying candidate beams and their corresponding reference signals before beam failure occurs. When beam failure is detected, the terminal can immediately switch to pre-identified candidate beams without requiring extensive reconfiguration. This preliminary preparation significantly reduces the time loss during beam recovery while maintaining communication continuity, as the switching process involves already-configured beams rather than requiring new beam establishment.
Data Source
AI summary
This application discloses a signal transmission method, related devices, and a system. The method includes: sending, by a terminal, link reconfiguration request information to a network device at a moment n, where the link reconfiguration request information is used to initiate link reconfiguration; and detecting, by the terminal based on first information, a physical downlink control channel (PDCCH) during a first time period after the moment n. The first information includes QCL information of a first reference signal and a second reference signal. The first reference signal is used to demodulate the PDCCH. The second reference signal is a reference signal meeting a first threshold.