Beam Switching Indication for LEO Doppler Synchronization
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Solution Overview
Problem
In LEO satellite communication systems, frequent beam switching due to high-speed satellite movement leads to significant signaling overhead and frequency hopping, reducing communication efficiency, while large Doppler frequency offsets complicate link establishment, often resulting in synchronization failures and decreased efficiency.
Innovation Solution
Implementing an information indication method that includes sending elevation and residence information of beams, and frequency offset pre-compensation information to facilitate autonomous beam switching and frequency synchronization in terminal devices, thereby reducing signaling overhead and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional beam switching methods are used in LEO satellite communication systems, then beam switching can be performed, but significant signaling overhead is generated and frequency hopping occurs, resulting in decreased communication efficiency
Solution Approach 1:
The patent applies preliminary action by pre-configuring beam residence time information and elevation threshold information in the terminal device before beam switching occurs. The network device sends indication information containing beam residence times and elevation thresholds in advance, allowing the terminal device to autonomously determine when to switch beams without requiring real-time signaling during the switching process, thereby reducing signaling overhead and improving communication efficiency
Solution Approach 2:
The patent implements self-service by enabling the terminal device to autonomously perform beam switching decisions based on pre-configured parameters. The terminal device independently calculates whether beam switching should occur by comparing current elevation angles with threshold information and checking residence times against beam residence time information, eliminating the need for continuous network control signaling and reducing system complexity
2Reliability
If frequent beam switching is performed due to high-speed satellite movement, then coverage is maintained, but frequency hopping occurs and communication efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring beam residence time information and elevation threshold information in the terminal device before beam switching occurs. The network device sends indication information containing beam residence times and elevation thresholds in advance, allowing the terminal device to autonomously determine when to switch beams without requiring real-time signaling during the switching process, thereby reducing signaling overhead and improving communication efficiency
Solution Approach 2:
The patent implements dynamics by introducing time-based residence information that allows beam switching parameters to adapt dynamically. The beam residence time information enables the system to maintain flexibility in beam switching decisions while reducing the frequency of switching operations, balancing coverage reliability with communication efficiency through dynamic parameter adjustment
3Reliability
If Doppler frequency offset compensation is performed for each beam switching, then frequency synchronization can be maintained, but signaling overhead increases and communication efficiency decreases
Solution Approach 1:
The patent applies merging by combining multiple compensation parameters (Doppler frequency offset, frequency shift, and timing advance) into a single compensation framework. The network device sends unified indication information containing all necessary compensation parameters for beam switching, allowing the terminal device to perform comprehensive frequency and timing compensation without requiring separate signaling for each parameter, thereby reducing signaling overhead while maintaining synchronization reliability
Solution Approach 2:
The patent implements universality by creating a multi-functional compensation mechanism that handles Doppler frequency offset, frequency shift, and timing advance compensation simultaneously. The indication information from the network device serves multiple purposes: providing beam residence time information, elevation thresholds, and comprehensive frequency/timing compensation parameters, eliminating the need for multiple separate signaling processes
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
The method allows terminal devices to autonomously determine beam switching based on elevation information and adjust frequency offsets, minimizing signaling overhead and synchronization failures, thus enhancing communication efficiency in LEO satellite networks.
Implementation Method 1
large Doppler frequency offsets complicate link establishment, often resulting in synchronization failures and decreased efficiency
Implementation Method 2
the second indication information includes frequency offset pre-compensation information for beam switching of the second communication node
Data Source
AI summary
Provided are information indication method, communication node and computer-executable storage medium. The information indication method includes that a first communication node sends first indication information including elevation information and residence information of a beam, which mainly solve how to enable the terminal device to switch the serving beam at a minimum signaling cost.