Wireless Terminal WLAN Scan Power Reduction
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Solution Overview
Problem
Existing wireless communication terminals consume unnecessary power due to continuous scanning outside WLAN service areas, and existing solutions either require additional facilities, complex systems, or increase scan intervals, leading to inefficiencies and increased costs.
Innovation Solution
A wireless communication terminal that stores base station position information and corresponding WLAN profiles, turning off WLAN power when outside the service area and scanning only necessary profiles, reducing power consumption and eliminating the need for additional facilities or complex systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the scan interval is set short to establish connection soon after entering WLAN-AP, then connection speed is improved, but power consumption increases due to continuous scanning outside service area
Solution Approach 1:
The terminal performs preliminary actions by storing base station profile information and WLAN access point information in advance. When the terminal is outside the service area, the system uses stored profile data to determine which WLAN profiles to scan, eliminating the need for continuous scanning while maintaining quick connection capability when entering the service area.
Solution Approach 2:
The scanning operation is made local and targeted by filtering WLAN profiles based on the current base station's service area information. Instead of scanning all stored WLAN profiles, the system selectively scans only profiles associated with the current or recent base stations, reducing power consumption while maintaining connection speed.
2Use of energy by moving object
If the scan interval is increased gradually to reduce power consumption, then power saving is improved, but response time at restoration deteriorates
Solution Approach 1:
The scan interval and scanning behavior are made dynamic rather than static. The system adjusts scanning frequency and scope based on real-time conditions - using stored profiles to enable selective scanning when outside service area, and performing comprehensive scanning when entering service area, thus maintaining both power saving and quick response.
Solution Approach 2:
The system uses feedback from base station location information and service area status to control scanning behavior. By continuously monitoring the current base station's service area information and comparing it with stored profiles, the system dynamically adjusts scanning operations to balance power saving with restoration response time.
3Measurement precision
If GPS is used to acquire position information for WLAN area specification, then location accuracy is improved, but power consumption increases due to GPS detection
Solution Approach 1:
The system uses base station location information as an intermediary to determine service area status, replacing the need for direct GPS positioning. The base station's stored profile information acts as a mediator that provides location context without requiring the terminal to perform energy-intensive GPS measurements.
Solution Approach 2:
Instead of using GPS to directly determine the terminal's position, the system copies and utilizes base station profile information that already contains location and service area data. This copied information suffices for determining which WLAN profiles to scan, eliminating the need for additional GPS power consumption.
4Measurement precision
If additional facilities like entrance/exit managing apparatus are added to control scan operation, then scan control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The terminal performs self-service by utilizing its own stored base station profile information and service area data to control scanning operations. The system determines which WLAN profiles to scan based on its current location context without requiring external entrance/exit managing apparatus or additional infrastructure.
Solution Approach 2:
The base station profile storage and scanning control mechanism serves multiple functions: it controls scan operation timing, determines scan scope, and manages power consumption. This multi-functional approach eliminates the need for separate dedicated facilities while maintaining accurate scan control.
Data Source
AI summary
A mobile phone terminal receives current position information thereof from a public wireless base station, and stores the current position information. The mobile phone terminal reads a profile name corresponding to the position information from a public wireless base station-WLAN profile association table, and sets the WLAN profile as a scan profile. Then, the mobile phone terminal scans the WLAN profile when the mobile phone terminal is located outside the WLAN service area.