PoC Server Answer Mode Synchronization via RTCP Payload
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Solution Overview
Problem
In Push-to-Talk over Cellular (PoC) systems, there is a mismatch in answer modes between the PoC server and client, leading to issues with media stream processing due to delayed or erroneous signal responses, particularly when the response mode is not reflected in real-time, causing race conditions and affecting call processing efficiency.
Innovation Solution
A method and system that transfers response mode information to the PoC client when an automatic response mode is set up in a pre-established session, ensuring immediate handling of changed response modes by processing a call connection request message and using Real-Time Control Protocol (RTCP) messages to notify the client of incoming media streams, thereby synchronizing the answer mode between the server and client.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic response mode is set up in PoC server, then call processing speed is improved, but answer mode mismatch between server and client causes media stream processing errors
Solution Approach 1:
The patent implements a feedback mechanism where the PoC server monitors the answer mode of the client and compares it with the server's own answer mode. When a mismatch is detected, the server sends a notification message to the client to synchronize the answer modes. This feedback loop ensures that both server and client operate with consistent answer mode settings, preventing media stream processing errors while maintaining the fast automatic response mode operation.
Solution Approach 2:
The patent performs preliminary synchronization of answer modes before media stream processing begins. The server checks for answer mode consistency as part of the call setup process, and if mismatch is detected, it initiates correction by notifying the client to change its answer mode. This preliminary action prevents potential media stream processing errors before they occur, ensuring reliable operation from the start of the call.
2Reliability
If response mode information is transferred to PoC client, then answer mode synchronization is improved, but additional signaling in network occurs
Solution Approach 1:
The patent implements selective answer mode synchronization by only transferring response mode information when a mismatch is actually detected between server and client. Rather than continuously exchanging answer mode information or including it in every signaling message, the system performs the action partially - only when necessary. This reduces unnecessary signaling in the network while still achieving complete answer mode synchronization when needed.
Solution Approach 2:
The patent uses an intermediary approach by implementing answer mode checking and synchronization as part of the existing call control signaling flow. Rather than introducing a separate dedicated signaling channel for answer mode synchronization, the system embeds the synchronization function within the existing signaling infrastructure, using available signaling messages to convey answer mode information when needed. This minimizes additional signaling complexity.
Data Source
AI summary
Disclosed is a method and system for establishing a session for a Push to Talk (PTT) over Cellular call (PoC). In the method, when an answer (response) mode of a PoC server and a PoC client are not in accordance with each other, an error message is transmitted to the receiving PoC server Moreover, call processing for a PoC call is improved by inserting a new data field indicating an automatic answer of a server into a payload of a Real-time Transport Protocol (RTCP) message, and a function of the terminal is extended using an added data field when the answer modes of the corresponding PoC server and PoC client are not in accordance with each other.