Communication Device GNSS Gap Scheduling Through DCI Timing
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Solution Overview
Problem
In satellite IoT systems, the rapid movement of satellites relative to terminal devices causes significant Doppler shifts and changing propagation delays, necessitating precise determination of global navigation satellite system (GNSS) measurement gaps for uplink and downlink time-frequency synchronization, which is challenging due to the need for accurate location information.
Innovation Solution
A method and device that utilize downlink control information (DCI) to determine GNSS measurement gaps based on time-domain resource locations, enabling flexible scheduling of random access procedures and data transmission to facilitate precise GNSS measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the satellite moves rapidly relative to the terminal device, then the Doppler shift and propagation delay change rapidly, but the determination of GNSS measurement gap location becomes more difficult
Solution Approach 1:
The network device pre-configures measurement gap patterns and provides measurement gap configuration information to the terminal device in advance. This allows the terminal to determine GNSS measurement gap locations based on pre-established timing relationships with downlink control information, without needing to calculate complex Doppler shifts in real-time, thus resolving the contradiction between rapid satellite movement and measurement gap determination difficulty
Solution Approach 2:
The patent introduces downlink control information (DCI) and measurement gap configuration information as intermediary elements that mediate between the satellite's rapid movement and the terminal's need to determine measurement gap locations. The DCI carries timing information that serves as a reference for calculating measurement gap positions, simplifying the determination process despite Doppler effects
2Measurement precision
If the terminal device performs frequent GNSS measurements, then the location information accuracy improves, but the battery consumption increases
Solution Approach 1:
The patent implements periodic GNSS measurements by configuring measurement gaps at regular intervals defined by the measurement gap pattern. The terminal device performs measurements only during these predetermined gaps rather than continuously, maintaining location accuracy while significantly reducing battery consumption by keeping the GNSS receiver off between measurement intervals
Solution Approach 2:
The measurement gap pattern allows the terminal to perform partial measurements - only during configured gaps rather than continuous monitoring. This partial action approach provides sufficient location information for satellite communication synchronization while consuming far less energy than continuous GNSS reception would require
3Productivity
If the measurement gap is scheduled flexibly, then the resource utilization improves, but the complexity of scheduling increases
Solution Approach 1:
The measurement gap configuration mechanism serves multiple functions: it defines measurement timing, provides synchronization references, and enables flexible resource allocation. By using a universal configuration approach where the same DCI structure and timing relationships apply regardless of specific measurement requirements, the system achieves flexible scheduling without proportionally increasing complexity
Solution Approach 2:
The patent achieves flexible measurement gap scheduling by allowing dynamic adjustment of measurement gap pattern parameters (such as periodicity, offset, and duration) through DCI signaling. Rather than creating complex custom schedules for each case, the system changes parameters of a standardized pattern, simplifying the scheduling mechanism while maintaining flexibility and improving resource utilization
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
Enables accurate GNSS measurements by determining GNSS measurement gaps, improving synchronization and reducing resource consumption and battery drain in IoT devices, supporting long-term data transmission scenarios without interference.
Implementation Method 1
Because the satellite moves rapidly relative to the terminal device, there is a very large Doppler shift between the terminal device and the satellite and between the satellite and the base station
Data Source
AI summary
A measurement method and a communication device are disclosed in the disclosure. The method includes: receiving downlink control information (DCI), and determining a location of a global navigation satellite system (GNSS) measurement gap at least according to a time-domain resource location of the DCI, where the DCI is used to trigger a random access procedure or the DCI is used to schedule data; or determining the location of the GNSS measurement gap at least according to a time-domain resource location of data, where the DCI is used to schedule the data, and where the GNSS measurement gap is used for GNSS measurement.