Access Media Gateway Overload Control via Priority Call Management
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Solution Overview
Problem
Existing access media gateway overload control methods fail to prioritize high-priority calls effectively and rely heavily on the Media Gateway Controller (MGC), leading to potential overload and prolonged service disruptions during high traffic loads.
Innovation Solution
The access media gateway (AG) is configured to independently manage call restrictions based on overload levels and call priority, reducing dependence on the MGC and shielding hook-off messages, ensuring high-priority calls are connected while ordinary calls are rejected, especially during high CPU occupancy rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the AG relies on the MGC to perform call restriction during overload, then the AG can maintain simple structure, but the MGC becomes a bottleneck and service disruption time increases
Solution Approach 1:
The AG is configured with call restriction policy and can independently perform call restriction operations when overload occurs, without needing to wait for MGC instructions. The AG autonomously determines whether to restrict calls based on its current load status and the configured policy, thereby reducing service disruption time while maintaining relatively simple structure through localized decision-making capability
2Productivity
If the AG restricts all subscriber calls uniformly during overload, then the system can quickly reduce load, but high-priority calls cannot be guaranteed
Solution Approach 1:
The call restriction policy is configured with differentiated treatment for different call types. The AG identifies high-priority calls (such as emergency calls) and applies different restriction rules compared to ordinary calls. During overload, the AG preferentially guarantees high-priority calls while restricting ordinary calls, achieving both fast load reduction and reliability for critical services through localized quality differentiation in call handling
3Loss of time
If the AG independently performs call restriction, then service disruption time is reduced, but the AG device complexity increases
Solution Approach 1:
The call restriction policy is pre-configured in the AG before overload occurs. The policy includes thresholds, restriction ratios, and high-priority call identification rules. When overload happens, the AG simply executes the pre-configured policy rather than making complex real-time decisions, thereby reducing service disruption time while limiting the increase in device complexity through advance preparation of control parameters
Data Source
Figure 1
AI summary
An overload control method for the access media gateway and an access media gateway, the media gateway limits call to its calling party user or its called party user, set the different overload levels and the priority call assured by each overload level on the access media gateway; the user of the access media gateway is the calling party or the called party and after it detects itself overload, determines the overload level; determines whether the call is the priority call assured by the overload level, if so, processing the call according to the normal procedure; otherwise rejecting the call. The present invention prevents AG system from collapse when the high traffic volume occurs, while effectively assures the continuous connection of the high priority comprising the emergence call and/or the call of the high priority port, it may reduce the dependency on MGC, prevent MGC overload, and abate the overload of AG quickly, shorten the time about the service influence.