Communication Node Physical Layer Division for Time Synchronization
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Solution Overview
Problem
The existing mobile communication systems face challenges in providing communication services in areas with limited cable capacity, such as building or subway shadow zones, due to the insufficient capacity of shared 3G/4G cables to support 5G transmission speeds.
Innovation Solution
A communication system employing physical layer division, where a remote unit extracts an initial random access signal from an uplink signal, reduces its data amount, and calculates time synchronization errors using a reduced data initial random access signal in an upper physical layer, involving frequency shifting, low-pass filtering, and downsampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If physical layer division is implemented to reduce data transmission requirements, then data capacity is enhanced, but measurement precision of time synchronization error may be affected
Solution Approach 1:
The physical layer is divided into first and second physical layers, where the first physical layer handles initial random access signal extraction and data amount reduction, while the second physical layer performs time synchronization error calculation. This segmentation allows each layer to specialize in specific functions, improving overall system efficiency and data capacity while maintaining synchronization accuracy through coordinated operation between layers.
Solution Approach 2:
The patent introduces an intermediary processing mechanism where the first physical layer extracts and reduces the data amount of the initial random access signal before passing it to the second physical layer. This intermediary step acts as a bridge that reduces data transmission requirements while preserving the essential information needed for accurate time synchronization error estimation in the second physical layer.
2Productivity
If data amount of initial random access signal is reduced, then data transmission requirements are reduced, but time synchronization error calculation accuracy may be compromised
Solution Approach 1:
The first physical layer performs partial action by extracting only the essential components of the initial random access signal and reducing the data amount to a level that is sufficient for the second physical layer's time synchronization error calculation. This partial reduction approach maintains the necessary information for accurate synchronization while significantly reducing data transmission requirements, avoiding the need to transmit the full original signal.
Solution Approach 2:
The patent transitions from the original signal dimension in the first physical layer to a processed signal dimension in the second physical layer. By reducing the data amount through downsampling or compression while preserving key characteristics, the system operates in a transformed dimension where time synchronization can be accurately calculated with reduced data requirements, effectively solving the contradiction between data transmission efficiency and calculation accuracy.
Data Source
AI summary
Provided are a method of operating a communication system using physical layer division, the method comprises extracting an initial random access signal from an uplink signal, in a first physical layer of a first communication node of the communication system reducing a data amount of the extracted initial random access signal in the first physical layer and calculating a time synchronization error using the initial random access signal with a reduced amount of data, in a second physical layer of a second communication node of the communication system.