Satellite Channel Estimation Windows Using Timing Adjustment Indications
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Solution Overview
Problem
In satellite communication, the configuration of joint channel estimation windows is inaccurate due to events such as uplink and downlink switching and timing advance adjustments, which disrupt phase continuity and power stability, affecting the performance of joint channel estimation.
Innovation Solution
A communication method where a terminal device reports duration periods during which it does not perform open-loop timing advance or frequency offset adjustments, allowing the network device to accurately configure a joint channel estimation window, thereby avoiding disruptions from these adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If open-loop timing advance adjustment is performed by terminal device, then timing synchronization is improved, but phase continuity is disrupted affecting joint channel estimation accuracy
Solution Approach 1:
The patent segments the timing advance adjustment process by introducing a indication parameter that divides adjustment operations into distinct phases. This segmentation allows the system to identify specific time periods where adjustments occur, thereby isolating their impact on phase continuity and enabling more accurate channel estimation during stable periods.
Solution Approach 2:
The patent applies preliminary action by having the terminal device send an indication parameter in advance that notifies the network device of upcoming timing advance adjustments. This advance notification allows the network device to prepare for phase discontinuities before they occur, maintaining better synchronization and estimation accuracy.
2Ease of operation
If joint channel estimation window is configured based on nominal parameters, then configuration simplicity is improved, but actual estimation accuracy deteriorates due to events splitting the window
Solution Approach 1:
The patent implements feedback by having the terminal device send indication parameters to the network device about its timing advance adjustment status. This feedback loop allows the network device to dynamically adjust the joint channel estimation window configuration based on actual terminal behavior, resolving the conflict between simple nominal configuration and accurate adaptive configuration.
Solution Approach 2:
The patent introduces dynamic adjustment of the joint channel estimation window by using indication parameters to adapt window timing and duration. Instead of fixed nominal parameters, the window configuration becomes dynamic, adjusting in real-time to account for timing advance events and maintain estimation accuracy.
3Device complexity
If terminal device performs autonomous timing advance adjustment, then network control overhead is reduced, but network device cannot predict adjustment timing affecting window configuration
Solution Approach 1:
The patent introduces an indication parameter as an intermediary mechanism between the terminal device's autonomous adjustment and the network device's window configuration. This intermediary carries timing information from the terminal to the network, allowing autonomous operation while maintaining information flow about adjustment events.
Solution Approach 2:
The patent replaces direct network control of timing advance with a lighter mechanism where the terminal autonomously adjusts timing and simply notifies the network via indication parameters. This substitution reduces control overhead while preserving necessary coordination through a simplified signaling mechanism.
Data Source
AI summary
A communication method and system, the method including receiving, by a network device, first indication information, where the first indication information indicates a first duration, and the first duration includes a duration in which a terminal device omits performance of at least one of open-loop timing advance adjustment or open-loop frequency offset adjustment, determining, by the network device, a first window based on the first duration, where the first window is associated with channel estimation, and sending, by the network device, second indication information to the terminal device, where the second indication information indicates the first window.