Channel-Aware Common Delay Scrambling for NTN Uplink Synchronization
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Solution Overview
Problem
In satellite mobile communication systems, different terminal devices within a cell experience varying one-way transmission delays due to their different positions, leading to interference and inaccurate reception of common delay information, which is crucial for uplink synchronization, especially in NTN systems where delays exceed the maximum delay acceptable by NR networks.
Innovation Solution
A communication apparatus determines feature information of a target channel and uses scrambling information, such as a Gold sequence, to process common delay information, ensuring secure transmission and accurate reception by another apparatus through descrambling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common delay information is transmitted without scrambling, then transmission simplicity is maintained, but transmission accuracy and reliability deteriorate due to interference from other channels
Solution Approach 1:
The patent applies parameter changes by introducing scrambling sequences that modify the common delay information before transmission. The scrambling process transforms the original information into a protected form that is resistant to interference, while the receiving device can reverse the process through descrambling to recover the accurate delay information.
2Reliability
If scrambling information is used to process common delay information, then transmission accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent uses copying by creating a scrambled version of the common delay information that contains all necessary data in a protected form. The receiving device holds a copy of the scrambling sequence to reverse the process, effectively using duplication to protect information without fundamentally changing the data content.
3Area of stationary object
If terminal devices are located at different positions in the same cell, then service coverage is expanded, but transmission delay variation increases causing interference
Solution Approach 1:
The patent applies local quality by providing each terminal device with specific delay compensation information tailored to its position. The common delay information is adjusted locally for each device based on its distance from the satellite, allowing devices at different positions to achieve accurate synchronization despite varying propagation delays.
Data Source
AI summary
An information transmission method and apparatus are provided. A first communication apparatus determines feature information of a target channel and first common delay information, and determines scrambling information based on the feature information of the target channel. The first communication apparatus processes the first common delay information based on the scrambling information, to obtain second common delay information. The first communication apparatus sends the second common delay information through the target channel. A second communication apparatus receives the second common delay information through the target channel, and determines the feature information of the target channel. The second communication apparatus determines descrambling information based on information of the target channel, and further processes the second common delay information based on the descrambling information to obtain the first common delay information.