Packet Congestion Handling via Priority Marking and Feedback
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Solution Overview
Problem
Current packet communication systems face congestion issues, leading to ignored or discarded call requests, especially during mass calling events or when gateway controllers are overloaded, resulting in inadequate handling of emergency calls due to lack of priority marking and increased resource usage.
Innovation Solution
Implementing a packet communication system where end communication devices transmit call request messages with priority information, allowing the call processing system to identify and prioritize high-priority calls, and respond with congestion messages to the end device, enabling proactive call blocking and user notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gateway controller processes all invite messages during congestion, then emergency calls may be identified, but the processing burden increases and resources are overwhelmed
Solution Approach 1:
The patent applies preliminary action by marking priority information in the SIP message header before the gateway controller processes the message. This allows the gateway controller to identify high-priority calls (such as emergency calls) without having to fully process and analyze the entire message content, thereby reducing processing burden while ensuring reliable emergency call handling during congestion
2Reliability
If the SIP phone re-transmits invite messages when no response is received, then call setup may eventually succeed, but congestion in the gateway controller is exacerbated
Solution Approach 1:
The patent applies feedback by implementing a congestion notification mechanism where the gateway controller sends congestion indication messages back to the SIP phone when it detects congestion. The SIP phone uses this feedback information to adjust its re-transmission behavior, reducing or suspending re-transmissions during congestion periods. This maintains call setup reliability for necessary calls while preventing unnecessary re-transmissions from exacerbating gateway controller load
3Productivity
If the gateway controller discards invite messages during congestion, then processing load is reduced, but end users are not notified of call status
Solution Approach 1:
The patent applies feedback by implementing a congestion notification mechanism where the gateway controller sends congestion indication messages back to the SIP phone when it detects congestion. The SIP phone uses this feedback information to adjust its re-transmission behavior, reducing or suspending re-transmissions during congestion periods. This maintains call setup reliability for necessary calls while preventing unnecessary re-transmissions from exacerbating gateway controller load
Data Source
AI summary
A packet communication system is disclosed that includes an end communication device, a call processing system, and a packet network. To setup up a call from an end user, the end communication device transmits a call request message to the call processing system. The call request message has a header that includes priority information for the call. The call processing system processes the priority information in the header of the call request message to determine if the call request message is for a high priority call. If the call request message is not for a high priority call and the call processing system is in a state of congestion, then the call processing system transmits a response message indicating the state of congestion. Responsive to receiving the response message, the end communication device performs call blocking and provides call treatment to the end user.