Cell Search Method for Multi-Mode Telecommunication Apparatus
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Solution Overview
Problem
Multi-mode telecommunication apparatuses face challenges in initial synchronization and power consumption when operating in environments with multiple communication modes, as the number of carrier frequency combinations increases, leading to prolonged and energy-intensive cell search processes, especially when the signal environment changes significantly.
Innovation Solution
A cell search method that transforms received signals into the frequency domain, estimates power spectral density, correlates it with known communication mode signatures, and prioritizes cell search based on estimated probabilities, allowing for efficient identification of the most probable communication mode without requiring significant hardware additions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the telecommunication apparatus searches all carrier frequency combinations in multiple communication modes, then the cell search becomes comprehensive and reliable, but the initial synchronization time becomes long and power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing a fast Fourier transform (FFT) on received signals before cell search to obtain a power spectrum. This preliminary spectral analysis identifies likely carrier frequencies in advance, allowing the subsequent cell search to focus only on these identified frequencies rather than exhaustively searching all possible carrier frequency combinations across multiple communication modes. This pre-processing step reduces the search space and accelerates synchronization while maintaining reliability.
Solution Approach 2:
The patent segments the cell search process into two distinct phases: (1) a preliminary FFT-based spectral analysis phase that identifies candidate carrier frequencies, and (2) a focused cell search phase that operates only on these candidate frequencies. This segmentation divides the originally monolithic exhaustive search into manageable stages, where the first stage filters out improbable frequencies and the second stage performs detailed cell identification only on the reduced set of candidates, thereby reducing overall time and power consumption.
2Reliability
If the telecommunication apparatus searches all carrier frequency combinations in multiple communication modes, then the cell search becomes comprehensive and reliable, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing a fast Fourier transform (FFT) on received signals before cell search to obtain a power spectrum. This preliminary spectral analysis identifies likely carrier frequencies in advance, allowing the subsequent cell search to focus only on these identified frequencies rather than exhaustively searching all possible carrier frequency combinations across multiple communication modes. This pre-processing step reduces the search space and accelerates synchronization while maintaining reliability.
Solution Approach 2:
The patent segments the cell search process into two distinct phases: (1) a preliminary FFT-based spectral analysis phase that identifies candidate carrier frequencies, and (2) a focused cell search phase that operates only on these candidate frequencies. This segmentation divides the originally monolithic exhaustive search into manageable stages, where the first stage filters out improbable frequencies and the second stage performs detailed cell identification only on the reduced set of candidates, thereby reducing overall time and power consumption.
3Use of energy by moving object
If the apparatus uses history list information to guide cell search, then power consumption is reduced, but the method fails when signal environment changes significantly or during first time synchronization
Solution Approach 1:
The patent applies self-service by enabling the apparatus to automatically characterize the signal environment through FFT-based spectral analysis without relying on pre-stored history lists. The system independently identifies carrier frequencies by analyzing the power spectrum of received signals, adapting to any signal environment whether it is a known historical scenario or a completely new geographical location. This self-characterizing capability ensures both low power consumption and high adaptability to changing conditions.
Solution Approach 2:
The patent applies parameter changes by dynamically determining carrier frequency parameters through spectral analysis rather than using fixed historical parameters. The FFT process transforms the time-domain received signals into the frequency domain, revealing the actual carrier frequencies present in the current signal environment. This dynamic parameter adaptation allows the system to adjust to any communication mode or frequency configuration encountered, whether in history list scenarios or completely new environments.
Data Source
AI summary
A cell search method for a multi-mode telecommunication apparatus is disclosed. The method comprises receiving signals present in a frequency range; transforming received signals into frequency domain; estimating power spectral density from transformed signals; estimating probability of different communication modes by correlating the estimated power spectral density with power spectral density signatures of said different communication modes; and performing cell search according to estimated most probable communication mode. Such an apparatus and a computer program for performing the method are also disclosed.