Probabilistic decentralized network management

10th International Conference on Network and Service Management (CNSM) and Workshop

Adiththan

Mukhopadhyay

2014

The paper considers the stability of AIMD-based rate adaptation algorithm for video transmission over a bandwidth-limited network path. We examine the stability aspects from two angles: first, a quick relief from congestion by a faster reduction of send rate, and second, a larger limit-cycle time with a slow rate reduction in the steady-state (and hence lower rate jitter). The stability assessment also considers the loss of feedback signals from the video receiver that indicate the packet loss on data channels. We provide a managementoriented assessment of the convergence properties of video rate control system. This in turn allows an autonomic adjustment of the AIMD parameters and the system controller models for optimal performance.

Section: Existing Work On Complex Network Systemsmentioning

confidence: 99%

Stability of video rate control algorithms over bandwidth-limited network paths

10th International Conference on Network and Service Management (CNSM) and Workshop

Adiththan

Mukhopadhyay

2014

“…Separating the adaptation behaviors from functional correctness aspects: namely, we categorize the existing works as dealing with: systems engineering for the control-theoretic aspects of adaptation (such as stability and convergence) [10], [11]. System-level tools exist to aid such studies (e.g., probabilistic monitoring & analysis [12]). The need for re-usable control loops across different domains is identified in [13].…”

Section: Existing Cps Work For Network Softwarementioning

confidence: 99%

Software cybernetics to infuse adaptation intelligence in networked systems

2013 Fourth International Conference on the Network of the Future (NoF)

Rabby

2013

Future network systems are expected to have various levels of adaptation capabilities: at parametric level, service-level, and application-level. These capabilities are often realized in multiple system layers, with the control logic needed for a specific capability residing in the application agents interfacing with the underlying network system services. We employ a software cybernetics approach, where an intelligent physical system module (IPW) embodies the core adaptation functionality to respond to the changing environment conditions and user inputs. The IPW exhibits an intelligent behavior over a limited operating region of the system. And, it is augmented by a supervisory module (ICW) that houses external feedback loops for situational assessment of the changing environment conditions. Our autonomic management of various hierarchical control loops comes under the ambit of Cyber-Physical Systems (CPS). The ICW patches the IPW with suitable control parameters and rules/procedures when the system operating conditions change. The paper illuminates our concept of IPW with a software engineering-oriented case study of multi-source video transfer over a bandwidth-limited network path.

“…It may be noted that some network management works elsewhere have also recently taken cognizance of a similar concept of continuum in the application-level QoS space by offering probabilistic frameworks for decentralized network management [7]. In contrast, we focus on managed QoS assurance as an application of the probabilistic approaches.…”

Section: Probabilistic View Of Failure Impactsmentioning

confidence: 99%

Managing Robustness of Distributed Applications Under Uncertainties

Proceedings of the Sixth Annual Workshop on Cyber Security and Information Intelligence Research

2011

The paper deals with how to manage the dependability of a distributed information system (DIS), in the presence of inaccuracies and partial knowledge of system models pertaining to failures of infrastructure components. The computational parts of a DIS are faced with two types of uncertainties: at 'information level' due to the multi-dimensional nature of measurement data emanating from the external environment (i.e., the physical world), and at 'control level' due to the incompleteness in knowledge about the application model for processing the measured data. These uncertainties have a compounded effect on the robustness of decisionmaking in the applications running on a DIS. Based on service-layer abstractions, the paper identifies applicationoriented metrics to quantify the quality of information flowing through a DIS. Suitable high-level quality metrics enable reasonably accurate decision-making by the application-layer control algorithms. Our approach is useful in the probabilistic management of: i) peer-to-peer communication assurance, and ii) fault-tolerance against component failures.