Selective TRS Listening for High-Speed Train Frequency Tracking
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Solution Overview
Problem
Wireless communication devices face challenges in efficiently determining the communication frequency while moving at high speeds, as existing methods require more components to be awake for longer periods, leading to increased power and processing resource consumption.
Innovation Solution
The device selectively listens for a tracking reference signal (TRS) during connected mode discontinuous reception (CDRx) based on whether it is in a high-speed train scenario, using frequency tracking loops to generate a frequency error and lock onto the communication frequency only when necessary, thereby reducing power and processing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device continuously monitors tracking reference signals to maintain accurate frequency tracking during high-speed movement, then frequency tracking accuracy is improved, but power consumption and processing resource usage increase
Solution Approach 1:
The patent applies dynamics by making the reference signal monitoring behavior adaptive rather than static. The device dynamically adjusts whether to monitor tracking reference signals based on real-time assessment of speed conditions and frequency error thresholds. This dynamic adaptation allows the system to maintain accurate frequency tracking when needed (during high-speed movement with significant Doppler shift) while conserving power during normal conditions, directly resolving the contradiction between tracking accuracy and power consumption
Solution Approach 2:
The patent changes the operational parameters of the monitoring system based on detected conditions. When the device determines it is moving at high speed (exceeding a speed threshold) and frequency error exceeds a threshold, it activates continuous TRS monitoring. Otherwise, it reduces monitoring activity. This parameter-based control strategy enables the system to optimize the balance between frequency tracking precision and power/resource consumption according to actual operational requirements
2Reliability
If the device activates frequency tracking loops continuously to lock onto communication frequency during movement, then frequency lock reliability is improved, but processing resource consumption increases
Solution Approach 1:
The patent makes the frequency tracking loop activation dynamic rather than continuous. The system assesses movement conditions and frequency error levels in real-time, activating the tracking loops only when high-speed movement is detected and frequency error exceeds acceptable thresholds. This dynamic activation ensures reliable frequency locking during challenging conditions while avoiding unnecessary processing resource consumption during stable, low-speed operation
Solution Approach 2:
The patent applies partial action by selectively activating frequency tracking loops only when necessary rather than maintaining full continuous operation. The system determines that partial monitoring and partial tracking activation are sufficient during normal conditions, reserving full tracking resources for high-speed scenarios where frequency stability is compromised. This partial action approach maintains reliability when needed while reducing overall processing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows the device to accurately determine the communication frequency while minimizing power and processing resource consumption, ensuring reliable communication without unnecessary resource expenditure.
Implementation Method 1
using frequency tracking loops to generate a frequency error and lock onto the communication frequency
Data Source
Figure 1
Figure 2A~2D
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AI summary
A device may selectively listen for a tracking reference signal (TRS) during connected mode discontinuous reception (CDRx) based on whether the device is to switch between repeaters of a base station (such as during travel). A device may determine whether the device is in a high speed train (HST) scenario (such as based on a difference in frequency errors generated using a synchronization signal block (SSB) and generated using a TRS, based on a trajectory of a frequency error or a frequency error difference over time, based on instantaneous frequency errors, etc.). When the device is in a HST scenario, the device listens for a TRS during CDRx, and the device generates a frequency error using the TRS. When the device is not in a HST scenario, the device prevents listening for a TRS during CDRx (with a SSB received during CDRx to be used to generate a frequency error).