QoS-Based Admission Control for Packet Network Path Performance
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Solution Overview
Problem
Existing admission control methods in IP networks, such as resource-based and measurement-based approaches, are inefficient in managing bandwidth and Quality-of-Service (QoS) across paths, particularly for next-generation applications like voice and videoconferencing, as they do not account for statistical multiplexing and require expensive router functionality, focusing on single links rather than end-to-end paths.
Innovation Solution
The implementation of Quality-of-Service (QoS)-based admission control (QBAC) techniques that use QoS parameter measurements, such as historical performance data and derivatives, to predict path performance and make admission decisions based on end-to-end path metrics, ensuring that bandwidth is sufficient without degrading QoS, and are infrastructure-independent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource-based admission control (RBAC) methods are used to reserve sufficient network resources for guaranteed QoS, then QoS reliability is improved, but network efficiency deteriorates because statistical multiplexing is ignored and additional flows cannot be admitted
Solution Approach 1:
The patent changes the fundamental parameter from deterministic resource reservation to statistical QoS measurement. Instead of reserving fixed bandwidth resources, the system measures actual QoS parameters (delay, loss, jitter) and uses these measurements to make admission decisions, allowing dynamic adaptation to actual network conditions while maintaining QoS guarantees
Solution Approach 2:
The patent enables the network to self-assess its QoS capacity through measurement-based techniques. The system autonomously monitors network performance, learns traffic patterns, and determines admission capacity without requiring external resource reservation commands, thereby improving efficiency while maintaining reliability
2Productivity
If measurement-based admission control (MBAC) methods are used to improve call admission efficiency, then network productivity is improved, but device complexity increases due to requirements for expensive router functionality and unavailable measurements
Solution Approach 1:
The patent replaces expensive, complex router measurement functionality with simpler, software-based QoS measurement mechanisms that can be implemented in standard network devices. The system uses readily available network performance data and applies statistical analysis algorithms that do not require specialized hardware or proprietary router capabilities
Solution Approach 2:
The patent introduces an intermediary measurement and analysis layer that sits between the network infrastructure and admission control decisions. This intermediary collects QoS data from standard network sources, processes the information using statistical methods, and provides admission recommendations, thereby decoupling the complexity from the network devices themselves
3Ease of operation
If existing MBAC techniques focus on single link bandwidth measurements, then measurement simplicity is improved, but measurement precision deteriorates because end-to-end path considerations are not addressed
Solution Approach 1:
The patent segments the end-to-end path into multiple measurement points and combines the results. Instead of measuring a single link in isolation, the system collects QoS measurements from multiple segments along the path and integrates them to determine overall path capacity, thereby maintaining simplicity at each measurement point while achieving precision for the complete path
Solution Approach 2:
The patent transitions from single-dimension (single link) measurements to multi-dimensional path measurements. The system measures QoS parameters across multiple links and dimensions of the network path, combining these measurements to create a comprehensive view of end-to-end capacity that accounts for the cumulative effect of all path segments
Data Source
AI summary
Methods and apparatus are provided for QoS-based admission control (QBAC). The disclosed QoS-based admission control techniques use QoS parameter measurements. An admission control request for a call on a path in a packet network is processed by obtaining performance data for the path; and predicting a performance of the call on the path using performance data for the path. In one implementation, the predicted performance is based on one or more derivatives of the performance data. Typically, the performance data includes historical performance data and is based on at least one quality of service metric.