PoC Group Session Signaling Reduction via IRS Segmentation
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Solution Overview
Problem
In Push to Talk Over Cellular (PoC) systems, the repeated checking of presence information for group sessions by PoC clients increases signaling costs and wastes wireless resources, as session initiators must confirm each member's availability individually, leading to a high burden on the PoC server during group session management.
Innovation Solution
The method divides the Invitation Reservation Service (IRS) into a process for setting up IRS parameters and a process for requesting service, allowing dynamic management of XML data and reducing server load by initiating sessions based on network conditions, using Session Initiation Protocol (SIP) and eXtensible Markup Language (XML) Configuration Access Protocol (XCAP) for efficient group session establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PoC clients repeatedly check presence information of all group members individually, then session establishment reliability is improved, but signaling cost and wireless resource consumption increase
Solution Approach 1:
The patent segments the presence checking process by introducing a session initiator that performs centralized presence verification for all group members, rather than having each client check individually. This segmentation reduces the number of signaling messages while maintaining reliable session establishment.
Solution Approach 2:
The session initiator acts as an intermediary between the PoC server and group members, centralizing the presence checking function. This intermediary role reduces the signaling burden on the network by consolidating multiple individual presence checks into a single coordinated verification process.
2Adaptability or versatility
If PoC server stores and manages all session setup parameters and XML data for IRS, then session management capability is improved, but server load and processing complexity increase
Solution Approach 1:
The patent applies preliminary action by having the session initiator pre-obtain and cache presence information and session setup parameters before initiating the group session. This advance preparation reduces the real-time processing burden on the PoC server during session establishment.
Solution Approach 2:
The session initiator creates a local copy of the necessary presence information and session parameters, reducing the need for the PoC server to repeatedly access and process the same XML data for each group session initiation.
3Measurement precision
If PoC clients subscribe to presence information of all group members, then session establishment accuracy is improved, but wireless resource consumption and signaling overhead increase
Solution Approach 1:
The patent merges multiple individual presence subscriptions into a single centralized presence checking process performed by the session initiator. This consolidation maintains accurate presence information for all group members while significantly reducing the total quantity of signaling messages and wireless resource consumption.
Data Source
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AI summary
A method, a terminal, and a system for establishing a Push to Talk Over Cellular(PoC) group session in a PoC network based on session initiation information, such as information regarding presence of clients to be invited or session start-up time. According to the method, Universal Resource Indicator(URI) information regarding invitation and Information Reservation Service(IRS) parameters are set up in a PoC eXtensible markup language Document Management Server(XDMS), and a PoC server is requested to provide an IRS so that a session is established.