Presence Information Framework for Wireless Communication Services
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Solution Overview
Problem
Current radio communication systems, particularly Push-To-Talk Over Cellular (PoC) services, lack effective methods to determine user availability, leading to inadequate presence information and increased session establishment delays.
Innovation Solution
A method and apparatus that determine events affecting terminal availability in a communication network, generating messages to provide extended presence information using registration state, barring state, and session-participation information, enhancing the binary availability model with SIP registration state event packages and Presence Information Data Format (PIDF) extensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional binary availability model is used in PoC services, then system simplicity is maintained, but presence information accuracy is insufficient
Solution Approach 1:
The patent segments the binary availability state into multiple granular presence states by dividing the availability determination into distinct components: registration state (registered/unregistered), barring state (barring/not barring), and session participation state (in session/not in session). This segmentation allows precise indication of user availability while maintaining systematic organization through the extended PIDF framework.
2Loss of information
If extended presence information is provided using registration state, barring state, and session participation information, then user availability accuracy is improved, but information processing complexity increases
Solution Approach 1:
The patent applies universality by creating a multi-functional presence information framework where the extended PIDF structure serves multiple purposes simultaneously: it indicates registration status, barring status, session participation, and overall availability. This single extended framework replaces what would otherwise require multiple separate information systems, reducing overall complexity while maintaining comprehensive presence information.
3Ease of operation
If detailed presence information is generated to differentiate temporary and permanent unavailability, then user experience is improved, but message generation and processing overhead increases
Solution Approach 1:
The patent implements preliminary action by pre-defining the extended presence information structure and the mapping relationships between registration state, barring state, session participation, and availability indicators. This preliminary framework is established before actual PoC sessions occur, allowing rapid generation of presence information during operation without requiring complex real-time processing, thus improving user experience while minimizing time loss.
Data Source
AI summary
An approach is provided for determining presence of a terminal within a communication network. An event affecting availability of a terminal over a communication network is determined. A message including information on the event is generated, wherein the message is used to provide presence information regarding the terminal.