VoIP Wireless LAN Terminal with BAS Authentication

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Solution Overview

Problem

Conventional VoIP wireless communication systems lack security and convenience due to the absence of user authentication and direct communication between clients, making them vulnerable to information leaks and malicious attacks.

Innovation Solution

A VoIP wireless telephone system utilizing a wireless LAN, which includes an SIP server for managing subscriber information, a BAS for user authentication and IP address management, a broadband modem with a wireless LAN interface, and a wireless LAN terminal that operates as a PPPoE client, ensuring secure connections through ID and password authentication and relay operations between the SIP server and the broadband modem.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If user authentication is implemented through BAS and PPPoE, then security against information leaks and malicious attacks is improved, but connection procedure complexity increases

Engineering Contradiction:

ImprovesecurityVSAvoidconnection procedure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The BAS (Broadband Access Server) acts as an intermediary between the wireless LAN terminal and the Internet, managing IP address assignment and user authentication through PPPoE. This mediator ensures security by verifying user credentials before allowing network access, while the automated authentication process minimizes the complexity burden on end users.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The wireless LAN terminal automatically performs authentication and IP address acquisition through the BAS using standard PPPoE protocols. The system handles authentication automatically without requiring manual configuration, and the terminal self-manages its connection parameters, reducing operational complexity while maintaining security.

Inventive Principle:

Principle #25Self-service

2Reliability

If wireless LAN terminal operates as PPPoE client with authentication, then security is improved, but ease of operation deteriorates

Engineering Contradiction:

ImprovesecurityVSAvoidease of connection

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system changes the connection parameters dynamically based on authentication status. Upon successful authentication, the BAS assigns an IP address and configures the terminal's network parameters automatically. This dynamic parameter adjustment occurs transparently to the user, maintaining ease of operation while ensuring security through controlled parameter changes.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If broadband modem relays IP frames through bridge operation, then network connectivity is improved, but device complexity increases

Engineering Contradiction:

Improvenetwork connectivityVSAvoidmodem function

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The broadband modem is designed with multi-functionality, serving both as a wireless LAN access point and as a bridge to the broadband network. It simultaneously handles wireless client connections, PPPoE authentication with the BAS, and IP frame relay operations, consolidating multiple functions into a single device to avoid increased system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The broadband modem merges the wireless LAN interface and broadband line interface into a single integrated device. The bridge operation combines wireless client traffic with broadband network traffic handling, consolidating what would otherwise be separate components into one unified modem that manages both connectivity functions efficiently.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If SIP server manages subscriber and connection information, then VoIP service capability is improved, but system complexity increases

Engineering Contradiction:

ImproveVoIP service capabilityVSAvoidsystem structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The SIP server acts as a centralized intermediary that manages all VoIP-related operations including subscriber authentication, session establishment, and connection management. By consolidating these functions in a dedicated server, the system achieves versatile VoIP capabilities while the modular server architecture prevents excessive complexity from propagating throughout the entire network.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7586885B2VoIP wireless telephone system and method utilizing wireless LAN

Publication Date: 2009.09.08 NEC CORP

AI summary

The present invention provides a VoIP wireless telephone system utilizing a wireless LAN wherein expansion of an IP wireless extension telephone is realized while ensuring secrecy of talk in a VoIP service. In the system, ID and password for connection to the Internet by PPPoE are set to a wireless LAN terminal; user authentication is executed with the above information upon connection to a BAS through a DSLAM; an ADSL modem transmits, to the BAS, IP frames received from the wireless LAN terminal; and after connection by PPPoE an IP address is given from the BAS to the wireless LAN terminal. ID and password for connection to an SIP server and the URL of the SIP server are registered in the wireless LAN terminal; connection from the wireless LAN terminal to the SIP server is made on the basis of the above connection information and the telephone number of the connection destination designated by a telephone; and the ADSL modem transmits, to the SIP server, IP frames received from the wireless LAN terminal to thereby establish a session to the telephone talk destination.