Base Station Synchronization Channel Cell Type Recognition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In cellular wireless communication systems, user terminals face challenges in quickly recognizing the type of cell, such as large scale or small scale, and whether a small scale cell applies a closed subscriber group (CSG), which affects the efficiency of initial cell search and neighbor cell search processes.
Innovation Solution
A base station device generates and transmits synchronization channel signals or broadcast channel signals that include information about the cell type, allowing terminal devices to recognize the cell type based on the scale and access restrictions, using grouped synchronization channel sequences and phase modulation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device performs detailed cell type recognition procedures, then the accuracy of cell type identification is improved, but the time required for cell search increases
Solution Approach 1:
The patent extracts the cell type identification information from the synchronization channel signal itself, allowing terminals to quickly determine cell type (macrocell, microcell, femtocell, CSG cell) without performing detailed analysis procedures. This extraction approach enables fast cell search while maintaining accurate cell type recognition.
Solution Approach 2:
The base station performs preliminary encoding of cell type information into the synchronization channel signal before transmission. This preliminary action allows terminals to immediately recognize cell type upon receiving the synchronization signal, eliminating the need for time-consuming post-reception analysis and achieving both speed and accuracy.
2Loss of information
If the base station transmits detailed cell information in broadcast channels, then the information completeness is improved, but the signal complexity increases
Solution Approach 1:
The patent extracts essential cell type identification information (macrocell/microcell/femtocell/CSG classification) from the comprehensive cell information and embeds it directly into the synchronization channel signal. This extraction eliminates the need for complex broadcast channel transmissions while ensuring complete cell type information is conveyed to terminals.
Solution Approach 2:
The synchronization channel signal serves multiple functions simultaneously: it provides synchronization information, cell identification, and cell type classification. This multi-functionality eliminates the need for separate detailed broadcast transmissions, reducing signal complexity while maintaining information completeness.
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
This approach reduces the time spent on cell search and enables seamless wireless communication by allowing terminals to quickly identify the appropriate system information for each cell type, improving service efficiency.
Implementation Method 1
the signal generator performs phase modulation of secondary synchronization channel sequence assigned to the synchronization channel, and also generates the secondary synchronization channel signal using the phase modulated secondary channel sequence
Data Source
AI summary
Disclosed are a base station device and a terminal device. The base station device includes a signal generator to generate a synchronization channel signal based on the cell type of a cell that the base station device manages, and a transmitter to transmit the synchronization channel signal via a synchronization channel established between at least one terminal device and the base station device, wherein the cell type is classified based on the information of the scale of the cell and whether the cell selectively allows access. The terminal may quickly recognize the cell type in a cellular wireless communication system having a hierarchical cell structure.