QoS Enforcer Feedback for Adaptive Channel Bandwidth
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Solution Overview
Problem
High-speed communication networks with adaptive channels face challenges in maintaining quality of service for real-time applications due to rapid changes in user data throughput, as simple flow-control mechanisms are insufficient to handle dynamic throughput changes.
Innovation Solution
A feedback mechanism is implemented to inform QoS enforcers about available bandwidth and capacity, calculated using average spectral efficiency, allowing the QoS mechanism to adjust traffic forwarding accordingly, ensuring high-priority applications maintain quality of service even during throughput decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple flow-control mechanisms are used in high-speed data networks with adaptive channels, then device complexity is reduced, but quality of service reliability deteriorates due to rapid changes in user data throughput
Solution Approach 1:
The patent implements a feedback mechanism where the QoS enforcer continuously monitors available bandwidth and capacity on adaptive channels and adjusts traffic forwarding decisions in real-time. This feedback loop enables the system to respond to rapid throughput changes caused by modulation and coding adjustments, maintaining QoS reliability without requiring overly complex flow-control mechanisms.
Solution Approach 2:
The QoS enforcer autonomously calculates available bandwidth based on observed spectral efficiency and automatically adjusts traffic forwarding without external intervention. This self-service capability allows the system to adapt to changing channel conditions dynamically, resolving the contradiction between simplicity and reliability.
2Productivity
If adaptive channels with dynamic modulation and coding are used, then data transmission efficiency is improved, but flow control reliability deteriorates due to rapid throughput changes
Solution Approach 1:
The patent employs dynamic bandwidth calculation where the QoS enforcer continuously updates available bandwidth estimates based on observed spectral efficiency from transmitted packets. This dynamic adaptation allows the system to maintain accurate flow control information despite rapid throughput changes from modulation and coding adjustments, preserving flow control reliability while enabling high transmission efficiency.
Solution Approach 2:
The system performs preliminary bandwidth estimation by calculating available capacity before making traffic forwarding decisions. By proactively determining bandwidth availability based on spectral efficiency trends, the QoS enforcer can make informed forwarding decisions that account for upcoming throughput changes, maintaining flow control reliability alongside high transmission efficiency.
3Reliability
If real-time bandwidth monitoring is implemented to maintain QoS during throughput changes, then quality of service reliability is improved, but device complexity increases
Solution Approach 1:
The patent monitors changes in spectral efficiency as a key parameter to infer available bandwidth variations. By tracking this single parameter and using it to update bandwidth estimates, the system achieves real-time QoS monitoring with relatively simple mechanisms, resolving the contradiction between reliability improvement and complexity increase.
Data Source
AI summary
Providing quality of service (QoS) for applications such as Voice over IP (VoIP) and enforcing service level agreements (SLA) are major requirement in any current and future communication networks. On the other hand, more communication networks are employing adaptive transmission mechanisms, such as DVB-S2 ACM in satellite communication networks. In non-adaptive networks, QoS enforcers use static bit rate configurations. However, using a static bit rate configuration in an adaptive network may result in underflow situations, during which it may not be possible to utilize the full capacity of the transmission channel and expensive resources may therefore be wasted, In addition, using a static bit rate configuration in an adaptive network may result in overflow situations, during which it may be necessary to drop user traffic packets and therefore quality of service may not be maintained. It is therefore imperative that QoS enforcers have knowledge of the network's available bit rate at all times. This invention describes a method for achieving exactly that.