Ingress Session Exchange Call Admission Control
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Solution Overview
Problem
Current call admission control methods in media over Internet Protocol (MoIP) networks are inefficient as they rely on serially hunting for available resources at egress points, leading to suboptimal use of network resources and scalability issues.
Innovation Solution
Ingress session exchange devices use call admission control (CAC)-related information to make predictive routing determinations, distributing the processing of CAC conditions and values across multiple session exchange devices, allowing for efficient bandwidth sharing and proactive management of network resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If call admission control conditions are applied at egress points using real-time call data, then call capacity availability can be accurately determined, but network resource utilization becomes suboptimal due to serial hunting for available resources
Solution Approach 1:
The patent applies preliminary action by having egress session exchange devices calculate and store predictive call admission control values in advance, based on historical CAC data and predicted traffic patterns. These pre-calculated values are then used by ingress devices for rapid routing decisions, eliminating the need for serial real-time queries and improving both measurement accuracy and network resource utilization efficiency
2Reliability
If ingress points serially send session requests to multiple egress points to check call capacity, then accurate routing decisions can be made, but processing time increases and scalability deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-calculating CAC values at egress devices and making these values available to ingress devices before call setup. This allows ingress devices to make accurate routing decisions using pre-computed data, significantly reducing the time required for processing session requests and improving scalability
Solution Approach 2:
The patent applies copying by having ingress session exchange devices obtain copies of pre-calculated CAC values from egress devices. Instead of performing complex real-time calculations or serial queries, ingress devices use these copied values to make rapid routing decisions, thereby reducing processing time while maintaining routing accuracy
3Ease of operation
If centralized routing engines are used to manage call admission control, then routing decisions can be centralized, but system complexity increases and scalability is limited
Solution Approach 1:
The patent applies segmentation by dividing the CAC functionality into distributed components: egress devices calculate and store local CAC values, while ingress devices use these values for routing decisions. This segmented approach eliminates the need for complex centralized routing engines, reducing system complexity while maintaining ease of operation through standardized interfaces
Solution Approach 2:
The patent implements self-service by enabling egress session exchange devices to autonomously calculate and maintain their own CAC values based on local traffic patterns and capacity. This self-service capability eliminates the need for complex centralized management, reducing system complexity while maintaining centralized control through the standardized CAC value exchange mechanism
Data Source
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AI summary
A method includes receiving at an ingress session exchange device a call admission control (CAC) condition and a CAC value associated with an endpoint of a first egress session exchange device and CAC-related information associated with an endpoint of a second egress session exchange device. The ingress session exchange device is at a border of a session over internet protocol network. A first call admission calculation is performed at the ingress session exchange device to determine whether the CAC condition is satisfied. A second call admission calculation is performed at the ingress session exchange device when the CAC condition is unsatisfied. The first call admission calculation and second call admission calculation are based on the CAC-related information.