USSD Connection-Oriented Signaling for WAP Push Session Initiation

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Solution Overview

Problem

Current Wireless Access Protocol (WAP) push mechanisms using SMS for Session Initiation Requests suffer from delays, unreliability, and race conditions, especially when users are roaming, due to the store-and-forward nature of SMS and potential backlogs.

Innovation Solution

Implementing a connection-oriented signalling channel using Unstructured Supplementary Service Data (USSD) for transmitting Session Initiation Requests, which eliminates the store-and-forward mechanism and provides immediate feedback on delivery success or failure, allowing for faster and more reliable push session initiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If SMS store-and-forward mechanism is used for transmitting Session Initiation Requests, then delivery persistence is improved, but delivery delay and backlog are introduced

Engineering Contradiction:

Improvedelivery persistenceVSAvoiddelivery delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent extracts the Session Initiation Request transmission from the SMS store-and-forward system and places it in a dedicated connection-oriented signaling channel. This separation allows the SIR to be delivered immediately without being held in SMS storage, eliminating the delay while maintaining reliability through the dedicated signaling path.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a connection-oriented signaling channel as an intermediary between the Push Proxy Gateway and Mobile Station. This intermediary provides immediate delivery capability without relying on the SMS store-and-forward mechanism, thus reducing delay while maintaining persistence through the established connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If SMS store-and-forward mechanism is used for transmitting Session Initiation Requests, then message storage capability is improved, but race conditions and backlogs are introduced

Engineering Contradiction:

Improvemessage storage capabilityVSAvoiddelivery reliability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent extracts the SIR transmission function from the SMS system's store-and-forward mechanism. By using a dedicated connection-oriented signaling channel, the system eliminates the race conditions that occur in SMS storage while maintaining the ability to store and forward messages through the established connection.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The connection-oriented signaling channel provides immediate feedback on delivery status, allowing the system to detect and handle delivery failures promptly. This feedback mechanism eliminates the hidden delays and race conditions inherent in SMS store-and-forward, improving overall delivery reliability.

Inventive Principle:

Principle #23Feedback

3Speed

If connection-oriented signaling channel is used for transmitting Session Initiation Requests, then delivery speed is improved, but connection establishment complexity is introduced

Engineering Contradiction:

Improvedelivery speedVSAvoidconnection establishment complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The connection-oriented signaling channel is designed to serve multiple functions: it establishes the push session, transmits initiation requests, and provides delivery confirmation. By consolidating these functions into a single connection, the system achieves fast delivery without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The connection-oriented signaling channel maintains a continuous active connection between the Push Proxy Gateway and Mobile Station for the duration of the push session. This continuity eliminates the need for repeated connection establishment and message retransmission, achieving fast delivery while keeping complexity manageable through the persistent connection.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS7720788B2System and method for implementing a wireless access protocol push by establishing connection-oriented signaling channel for transmitting session initiation request

Publication Date: 2010.05.18 MALIKIE INNOVATIONS LTD

AI summary

Methods and apparatus for initiating a Wireless Access Protocol (WAP) push session to push information from a push proxy gateway to a mobile station in a wireless communication network are provided. In one embodiment, the method comprises transmitting an initiation request to the mobile station using a connection-oriented signalling channel, the mobile station establishing a push session in response to the initiation request. Preferably, the connection-oriented signalling channel transmits the initiation request without using a store-and-forward mechanism. In one embodiment, the connection-oriented signalling channel comprises an Unstructured Supplementary Service Data (USSD) channel. The initiation request may conform to a WAP protocol for Service Initiation Requests (SIRs) or a USSD protocol for Unstructured Supplementary Service Requests (USSRs). In the latter case, the method may comprise establishing a connection with the mobile station using USSD; and sending a USSR message requesting the mobile station to activate and establish a push session.