Publications by Maaz Mashood Mohiuddin

FCR: Fast and Consistent Controller-Replication in Software Defined Networking

Jean-Yves Le Boudec, Maaz Mashood Mohiuddin, Mia Primorac, Eleni Stai

We consider the problem of coordination among replicated SDN controllers, where the challenge is to ensure a consistent view of the network while reacting to network events in a prompt manner. Existing solutions are either consensus-based, which achieve co ...

2019

Latency and Backlog Bounds in Time-Sensitive Networking with Credit Based Shapers and Asynchronous Traffic Shaping

Jean-Yves Le Boudec, Maaz Mashood Mohiuddin, Eleni Stai, Ehsan Mohammadpour

We compute bounds on end-to-end worst-case latency and on nodal backlog size for a per-class deterministic network that implements Credit Based Shaper (CBS) and Asynchronous Traffic Shaping (ATS), as proposed by the Time-Sensitive Networking (TSN) standard ...

IEEE2018

Ordering Events Based on Intentionality in Cyber-Physical Systems

Jean-Yves Le Boudec, Simon Bliudze, Maaz Mashood Mohiuddin, Wajeb Saab

We consider cyber-physical systems (CPSs) comprising a central controller that might be replicated for high-reliability, and one or more process agents. The controller receives measurements from process agents, causing it to compute and issue setpoints tha ...

2018

Reliability Mechanisms for Controllers in Real-Time Cyber-Physical Systems

Maaz Mashood Mohiuddin

Cyber-physical systems (CPSs) are real-world processes that are controlled by computer algorithms. We consider CPSs where a centralized, software-based controller maintains the process in a desired state by exchanging measurements and setpoints with proces ...

EPFL2018

T-RECS: A Virtual Commissioning Tool for Software-Based Control of Electric Grids – Design, Validation, and Operation

Jean-Yves Le Boudec, Lorenzo Enrique Reyes Chamorro, Maaz Mashood Mohiuddin, Wajeb Saab, Roman Rudnik, Jagdish Prasad Achara

In real-time control of electric grids using multiple software agents, the control performance depends on (1) the proper functioning of the software agents, i.e., absence of software faults, and (2) the behavior of software agents in the presence of non-id ...

ACM2018

Experimental Validation of the Suitability of Virtualization-Based Replication for Fault Tolerance in Real-Time Control of Electric Grids

Jean-Yves Le Boudec, Maaz Mashood Mohiuddin, Wajeb Saab, Jalal Mostafa, Seyed Alireza Sanaee Kohroudi

Real-time control systems (RTCSs) perform complex control and require low response times. They typically use third-party software libraries and are deployed on generic hardware, which suffer from delay faults that can cause serious damage. To improve avail ...

2018

A controller and an agreement protocol for a real-time control system

Jean-Yves Le Boudec, Simon Bliudze, Maaz Mashood Mohiuddin, Wajeb Saab

The present invention concerns a method of generating setpoints for actuators (13) of a real-time control system. The method comprises a first controller (9): a) receiving a first set of measurements from sensors (3), the measurements being individually la ...

2018

T-RECS: A Software Testbed for Multi-Agent Real-Time Control of Electric Grids

Jean-Yves Le Boudec, Maaz Mashood Mohiuddin, Wajeb Saab, Roman Rudnik, Jagdish Prasad Achara

Multiple software agents can be used to perform the real-time control of electrical grids. The control performance of such solutions is influenced by software non-idealities such as crashes and delays of the software agents, and message losses and delays d ...

2017

Ordering Events Based on Intentionality in Cyber-Physical Systems

Jean-Yves Le Boudec, Simon Bliudze, Maaz Mashood Mohiuddin, Wajeb Saab

We consider cyber-physical systems (CPSs) comprising a central controller that might be replicated for high-reliability, and one or more process agents. The controller receives measurements from process agents, causing it to compute and issue setpoints tha ...

2017

iPRP - the Parallel Redundancy Protocol for IP Networks: Protocol Design and Operation

Jean-Yves Le Boudec, Dan-Cristian Tomozei, Miroslav Popovic, Maaz Mashood Mohiuddin

Reliable packet delivery within stringent delay-constraints is of paramount importance to mission-critical computer applications with hard real-time constraints. Because retransmission and coding techniques counteract the delay requirements, reliability ma ...

Institute of Electrical and Electronics Engineers2016

Axo: Masking Delay Faults in Real-Time Control Systems

Jean-Yves Le Boudec, Simon Bliudze, Maaz Mashood Mohiuddin, Wajeb Saab

We consider real-time control systems that consist of a controller that computes and sends setpoints to be implemented in physical processes through process agents. We focus on systems that use commercial off-the-shelf hardware and software components. Set ...

2016

Experimental Validation of the Usability of Wi-Fi over Redundant Paths for Streaming Phasor Data

Jean-Yves Le Boudec, Miroslav Popovic, Maaz Mashood Mohiuddin, Athanasios Giannakopoulos

Applications performing streaming of phasor- measurement data require low latency and losses from the communication network. Traditionally, such requirements are realized through wired infrastructure. Recently, wireless infras- tructure has gained attentio ...

Ieee2016

Axo: Tolerating Delay Faults in Real-Time Systems

Jean-Yves Le Boudec, Simon Bliudze, Maaz Mashood Mohiuddin, Wajeb Saab

We address delay faults: faults that cause a software component to take more time for completing an action than a given deadline. Such faults are particularly of interest in real- time mission-critical control applications that use general-purpose computin ...

2016

iPRP: Parallel Redundancy Protocol for IP Networks

Jean-Yves Le Boudec, Dan-Cristian Tomozei, Miroslav Popovic, Maaz Mashood Mohiuddin

Reliable packet delivery within stringent delay constraints is of primal importance to industrial processes with hard real-time constraints, such as electrical grid monitoring. Because retransmission and coding techniques counteract the delay requirements, ...

2015

Real-Time State Estimation of the EPFL-Campus Medium-Voltage Grid by Using PMUs

Sidi-Rachid Cherkaoui, Jean-Yves Le Boudec, Mario Paolone, Teklemariam Tsegay Tesfay, Dan-Cristian Tomozei, Styliani Sarri, Paolo Romano, Miroslav Popovic, Marco Pignati, Lorenzo Zanni, Sergio Barreto Andrade, Maaz Mashood Mohiuddin, German Dario Flores Ponce

We describe the real-time monitoring infrastructure of the smart-grid pilot on the EPFL campus. We experimentally validate the concept of a real-time state-estimation for a 20 kV active distribution network. We designed and put into operation the whole inf ...

2015