PSYNC Process for Fast Cell Search in Multimode WCDMA Terminals
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Solution Overview
Problem
Current multimode mobile terminals face lengthy startup procedures due to decoupled frequency search processes for GSM and WCDMA technologies, leading to prolonged search times for available frequencies, especially in mixed coverage areas.
Innovation Solution
Implementing a PSYNC process that combines RSSI scan measurements and PSYNC detection operations to rapidly identify and mark WCDMA carrier frequencies, allowing for simultaneous or prioritized search across both GSM and WCDMA technologies, reducing the need for sequential searches and optimizing synchronization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If decoupled frequency search processes are used for GSM and WCDMA technologies, then each mode can be searched independently, but the startup procedure becomes lengthy and search time is prolonged
Solution Approach 1:
The patent combines the GSM frequency search and WCDMA frequency search into a unified search process. The method performs RSSI measurements across frequency bands and uses PSYNC detection to identify WCDMA carriers, allowing both GSM and WCDMA frequencies to be discovered simultaneously rather than through separate sequential searches. This merging of previously decoupled processes resolves the contradiction by maintaining adaptability for both modes while dramatically reducing startup time.
2Measurement precision
If sequential searches for GSM and WCDMA frequencies are performed, then thorough frequency identification is achieved, but the overall search duration increases
Solution Approach 1:
The patent implements continuous frequency scanning and RSSI measurement across the entire frequency band without interruption. Instead of performing discrete sequential searches for GSM then WCDMA, the system continuously monitors the spectrum, accumulating signal strength data and performing PSYNC detection ongoingly. This continuous action maintains thorough frequency identification while significantly increasing search speed by eliminating the start-stop nature of sequential approaches.
Solution Approach 2:
The patent performs preliminary RSSI measurements and signal strength assessments across all frequency bands before committing to detailed mode-specific searches. By预先 (in advance) identifying potential carrier frequencies through broad scanning and signal strength evaluation, the system prepares a prioritized list of frequencies to investigate further, thereby maintaining measurement precision while reducing the overall time required for complete frequency identification.
3Ease of manufacture
If separate search procedures are implemented for different modes, then mode-specific optimization is possible, but the startup procedure complexity and duration increase
Solution Approach 1:
The patent implements a universal frequency search procedure that handles both GSM and WCDMA modes through a single integrated process. The method uses mode-agnostic RSSI measurements and universal frequency scanning techniques that work for both technologies. PSYNC detection serves as a universal indicator that identifies WCDMA carriers within the unified search framework. This multi-functional approach maintains the ability to optimize for each mode while reducing procedural complexity by eliminating the need for separate search routines.
Data Source
AI summary
Certain aspects of a method and system for a fast cell search using a primary synchronization channel (PSYNC) process in a multimode wideband code division multiple access (WCDMA) terminal are provided. A WCDMA frequency search or a global system for mobile communications (GSM) frequency search is performed based on a current radio access technology (RAT), received signal strength indication (RSSI) scan measurements, and PSYNC detection operations. The RSSI scan measurements may be averaged by making multiple measurements during a measurement period. At least part of the PSYNC detection operations may be performed during a remaining portion of the measurement period. WCDMA carrier frequencies may be marked in accordance with the results of the PSYNC detection operations. For GSM, some of the frequencies may be removed from the search based on the PSYNC marking while the remaining search frequencies may be ranked based on results from the RSSI scan measurements.