Publications de Sergio Mena | EPFL Graph Search

Load Balancing Video Clients in Enterprise Wireless Networks

Dan-Cristian Tomozei, Lorenzo Granai, Aswin Suresh, Sergio Mena

Given the increasing popularity of real-time video communication over enterprise wireless networks, ensuring good quality of experience is becoming critical. A common problem in such networks is that the clients typically adopt the strategy of associating ...

IEEE2018

Distributed Rate Allocation in Switch-Based Multiparty Videoconferencing System

Pascal Frossard, Sergio Mena, Stefano D'Aronco

Multiparty videoconferences, or more generally multiparty video calls, are gaining a lot of popularity as they offer a rich communication experience. These applications have, however, large requirements in terms of both network and computational resources ...

2017

Improved Utility-based Congestion Control for Low-Delay Communication

Pascal Frossard, Laura Toni, Sergio Mena, Stefano D'Aronco

Due to the presence of buffers in the inner network nodes, each congestion event leads to buffer queueing and thus to an increasing end-to-end delay. In the case of delay sensitive applications, a large delay might not be acceptable and a solution to prope ...

Ieee-Inst Electrical Electronics Engineers Inc2017

Switching Between Loss-Based and Delay-Based Mode for Real-Time Media Congestion Controllers

Sergio Mena, Stefano D'Aronco

Congestion control may be provided. A set of rules may allow a congestion control process to switch from delay-mode to loss-mode (e.g., in the presence of loss-based flows) and back to delay-mode (e.g., when loss-based flows stop). Fairness properties of t ...

2017

Congestion control for media flows

Laura Toni, Sergio Mena, Stefano D'Aronco

An apparatus can include a congestion controller at a source endpoint node of a network that is configured to send substantially real-time media data at a variable sending rate to another endpoint node via the network. The congestion controller can be conf ...

2017

Distributed rate allocation in switch-based multiparty videoconference

Pascal Frossard, Sergio Mena, Stefano D'Aronco

Multiparty videoconferences, or more generally multiparty video calls, are gaining a lot of popularity as they offer a rich communication experience. These applications have however, large requirements in terms of both network and computational resources a ...

ACM2016

Relaxed Atomic Broadcast: State-Machine Replication Using Bounded Memory

André Schiper, Sergio Mena, Omid Shahmirzadi

Atomic broadcast is a useful abstraction for implementing fault-tolerant distributed applications such as state-machine replication. Although a number of algorithms solving atomic broadcast have been published, the problem of bounding the memory used by th ...

Ieee Computer Soc Press, Customer Service Center, Po Box 3014, 10662 Los Vaqueros Circle, Los Alamitos, Ca 90720-1264 Usa2009

On the Cost of Modularity in Atomic Broadcast

André Schiper, Sergio Mena, Nils Richard Ekwall, Olivier Rütti

Modularity is a desirable property of complex software systems, since it simplifies code reuse, verification, maintenance, etc. However, the use of loosely coupled modules introduces a performance overhead. This overhead is often considered negligible, but ...

2007

Protocol composition frameworks and modular group communication : models, algorithms and architectures

Sergio Mena

It is noticeable that our society is increasingly relying on computer systems. Nowadays, computer networks can be found at places where it would have been unthinkable a few decades ago, supporting in some cases critical applications on which human lives ma ...

EPFL2006

A new look at atomic broadcast in the asynchronous crash-recovery model

André Schiper, Sergio Mena

Atomic broadcast in particular, and group communication in general, have mainly been specified and implemented in a system model where processes do not recover after a crash. The model is called crash-stop. The drawback of this model is its inability to ex ...

2005