PBX SIP Control Module for Wireless LAN Location Tracking
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Solution Overview
Problem
Existing networks with SIP-compliant wireless terminals can only offer limited services, such as transfer, three-way calling, and call waiting, due to connectionless communication, and lack the ability to manage user location effectively.
Innovation Solution
Implementing a network with a modularized SIP protocol control module using a B2BUA scheme and a location-information management module within the private branch exchange, allowing connection-oriented communication and enabling wireless LAN terminals to notify their access point's unique identifier information, thereby providing a wide range of services and managing user location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If connectionless communication is used in IP network, then ease of operation is improved, but service range is limited
Solution Approach 1:
The patent introduces a B2BUA (back-to-back user agent) as an intermediary component in the PBX that acts as a proxy between the wireless terminal and the rest of the network. This intermediary enables the PBX to establish and manage connections for wireless terminals, thereby providing connection-oriented services while maintaining the ease of wireless access. The B2BUA mediates between the connectionless IP network and the connection-oriented PBX services, resolving the contradiction by enabling both ease of operation and expanded service range.
2Ease of operation
If wireless terminal connects via access point, then ease of operation is improved, but location tracking becomes difficult
Solution Approach 1:
The patent implements a feedback mechanism where the B2BUA in the PBX actively tracks and records the location information of wireless terminals through their access points. The system continuously updates the location data in the PBX database, creating a feedback loop that maintains location awareness despite the wireless terminal's mobility. This feedback mechanism resolves the contradiction by preserving location information while maintaining the ease of wireless connection through access points.
3Device complexity
If limited services are offered, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent segments the PBX functionality into distinct modules, with the B2BUA handling wireless terminal-specific operations and other PBX functions remaining separate. This segmentation allows the system to offer a wide range of services through modular components without increasing overall device complexity. Each module can be independently configured and managed, enabling adaptability while maintaining manageable complexity levels.
Data Source
AI summary
A standard-SIP (session initiation protocol) protocol control module and an expanded sip protocol control module are provided so as to correspond to respective Sip protocol corresponding terminals, such as wireless LAN terminals compliant with the SIP. A signal (a request) from each Sip protocol corresponding terminal is converted into a signal according to a protocol of an IP-PBX and is sent to a PBX basic-connection-processing providing module. A signal (a response for the request or a request to the Sip protocol corresponding terminal) from the PBX basic-connection-processing providing module is converted into an Sip protocol signal and is sent to the Sip protocol corresponding terminal. A location-information management module collects a basic service set identifier (BSSID) from each wireless LAN network and stores the BSSID information into a database.