NTN Downlink Search Window Offset for Moving-Satellite Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In NTN communication systems, the continuous movement of satellites results in varying propagation delays, making it challenging to determine the offset for the starting position of downlink search space windows (PUR SS Window) in NTN communication systems, which affects the PUR SS Window, and existing technologies have not adequately addressed this issue.
Innovation Solution
A method and apparatus are provided to determine and adaptively adjust the window offset using the network device, utilizing first configuration information to synchronize the NTN communication system, specifically by which the terminal acquires the first configuration information from the network device, and determines a current window offset according to the configuration information received from the network device, and adjusts the starting position of the downlink search space window relative to the pre-configured uplink resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the satellite continuously moves along a fixed orbit, then the propagation distance between terminal and satellite changes continuously, but the offset of downlink search space window starting position becomes difficult to determine
Solution Approach 1:
The patent applies dynamics by making the window offset determination adaptive to changing propagation distances. The terminal dynamically adjusts the downlink search space window starting position based on real-time propagation distance information, transitioning from a static offset approach to a dynamic one that continuously adapts to satellite movement.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal obtains propagation distance information from the network device and uses this feedback to adjust the window offset. The network device provides necessary information about propagation characteristics, and the terminal feeds back adjusted offset values to maintain synchronization despite continuous satellite movement.
2Reliability
If the propagation delay changes continuously with satellite position, then communication reliability is maintained, but consistency between network device and terminal offset determination is lost
Solution Approach 1:
The patent applies preliminary action by having the terminal proactively obtain propagation distance information from the network device before determining the window offset. The terminal performs preliminary calculations and adjustments based on anticipated propagation characteristics, ensuring both reliability and consistency in offset determination.
Solution Approach 2:
The patent changes the parameter approach by transitioning from fixed offset values to dynamic offset calculations based on real-time propagation distance measurements. The terminal adjusts the window offset parameter continuously to match actual propagation conditions, maintaining both communication reliability and determination consistency.
Data Source
AI summary
Provided are a method for window offset determination and a terminal, which are applied to a NTN communication system. The NTN communication system comprises a terminal and a network device. The method includes the following. The terminal acquires the first configuration information from the network device and determines a current window offset according to the first configuration information. The current window offset is used to represent an offset of a starting position of a downlink search space window corresponding to a current pre-configured uplink resource relative to a starting time, furthermore, the starting time is the end position of the current pre-configured uplink resource.