Cell Search Synchronization Using Signal Non-Circularity
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Solution Overview
Problem
Conventional cell search and synchronization procedures in cellular systems are inefficient in deployment scenarios with multiple carriers from different cellular systems coexisting on the same frequency band, leading to increased synchronization time and power consumption due to disrupted carrier rankings by non-desired cellular systems.
Innovation Solution
A method and apparatus that calculate a non-circularity measure of carrier signals to differentiate between desired and non-desired cellular systems, modifying the ranking process to prioritize carriers based on their non-circularity properties, thereby improving the efficiency of cell search and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional RSSI-based carrier ranking is used, then cell search and synchronization is efficient in single cellular system deployment, but synchronization time and power consumption increase in multi-cellular system deployment due to disrupted rankings
Solution Approach 1:
The patent changes the ranking parameter from pure RSSI (received signal strength indicator) to a composite parameter that incorporates non-circularity measures. This allows the system to distinguish between desired and non-desired carriers in multi-cellular system deployments, resolving the contradiction by maintaining ranking efficiency while adapting to complex deployment scenarios.
Solution Approach 2:
The patent introduces non-circularity measures as an intermediary characteristic to help distinguish between different cellular system carriers. This intermediary parameter enables the ranking process to filter out non-desired carriers, thereby reducing synchronization time without sacrificing the efficiency gains of RSSI-based ranking in single-system deployments.
2Use of energy by moving object
If conventional RSSI-based carrier ranking is used, then cell search and synchronization is efficient in single cellular system deployment, but power consumption increases in multi-cellular system deployment due to failed synchronization attempts
Solution Approach 1:
By modifying the ranking parameter to include non-circularity measures, the system achieves more reliable carrier selection in multi-cellular system deployments. This reduces the number of failed synchronization attempts and consequently lowers idle mode power consumption, resolving the contradiction between reliability and energy efficiency.
Solution Approach 2:
The non-circularity measure serves as an intermediary filtering mechanism that improves synchronization success rate by identifying desired carriers more accurately. This leads to fewer retry attempts and reduced power consumption, addressing both reliability and energy efficiency concerns simultaneously.
3Loss of time
If non-circularity measures are calculated to differentiate carriers, then synchronization time is reduced in multi-cellular system deployment, but device complexity increases
Solution Approach 1:
The patent modifies the carrier ranking parameter to include non-circularity measures, which reduces synchronization time in multi-cellular system deployments. While this does increase processing complexity, the enhancement is targeted and mathematically tractable, making it a practical solution that addresses the time-loss problem without excessive complexity.
Data Source
AI summary
There are provided measures for cell search and synchronization. Such measures may exemplarily comprise acquiring an observation signal for a carrier signal on a carrier which is under consideration for synchronization with a desired cellular system, calculating a power measure of the observation signal, which indicates a received power of said carrier signal, calculating a non-circularity measure of the observation signal, which indicates a non-circularity of said carrier signal, and calculating a ranking measure, which indicates an applicability of said carrier for synchronization with the desired cellular system, based on the calculated power measure and the calculated non-circularity measure.