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Related publications (13)

Nonlinear periodic orbit solutions and their bifurcation structure at the origin of soliton hopping in coupled microresonators

Coupled-microresonator systems, enabled by recent breakthroughs in the nanofabrication of low-loss integrated photonic microresonators, deliver significant performance benefits for coherent frequency comb generation beyond single resonators. They also display emergent nonlinear phenomena including soliton hopping—a dynamic process in which solitons periodically transit between coupled resonators. We employ a nonlinear dynamical systems approach, leveraging numerical techniques developed in the context of hy

Springer Science and Business Media LLC2026

Enhancing the Receiver-Driven Transport Paradigm with Sender Congestion Information

Congestion control in hyperscale datacenters underpins nearly every service, enabling the use of the network infrastructure while keeping communication among servers orderly. As workload requirements diversifyâ e.g., throughput-intensive ML training and disaggregated storage, and latency-critical microservicesâ link bandwidth keeps growing, but relative switch buffer capacity is not, reducing headroom to absorb traffic bursts. Against this backdrop, the question is how congestion control protocols can max

EPFL2025

Edge state optical frequency combs in the microresonator based Su-Schrieffer-Heeger model

Tobias Kippenberg, Xinru Ji, Alexey Tikan, Aleksandr Tusnin

We demonstrate the first observation of optical frequency combs at the edge state of the Su-Schrieffer-Heeger model. We show soliton-induced edge-bulk interaction and edge-state hopping. ...

Optical Society of America2023

In-Network Packet Scheduling and Rate Allocation: A Content Delivery Perspective

We investigate two important problems in media delivery via active network agents. First, we consider streaming multiple video assets over a shared backbone network through an intermediate proxy-server to a set of receiving clients. The proxy is located at ...

2011

Understanding and Tackling the Root Causes of Instability in Wireless Mesh Networks: (extended version)

Patrick Thiran

We investigate, both theoretically and experimentally, the stability of CSMA-based wireless mesh networks, where a network is said to be stable if and only if the queue of each relay node remains (almost surely) finite. We identify two key factors that impact stability: the network size and the so-called "stealing effect", a consequence of the hidden node problem and non-zero transmission delays. We consider the case of a greedy source and prove, by using Foster's theorem, that 3-hop networks are stable, bu

2010

Contact modeling and collision detection in human joints

Collision detection among virtual objects is one of the main concerns in virtual reality and computer graphics. Usually the methods developed for collision detection are for either very general cases or very specific applications. The first main goal of th ...

EPFL2009

Consensus and collision detectors in radio networks

Seth Gilbert

We consider the fault-tolerant consensus problem in radio networks with crash-prone nodes. Specifically, we develop lower bounds and matching upper bounds for this problem in single-hop radios networks, where all nodes are located within broadcast range of ...

2008

Modelling the IEEE 802.11 protocol in wireless multi-hop networks

Mathilde Durvy

IEEE 802.11 is probably the most widely used, medium access control protocol in current wireless networks. In the Wireless LAN (i.e., single-hop) setting, its performance is by now quite well understood. However, in the multi-hop setting where relay nodes ...

EPFL2007

Cooperation in Multi-hop Cellular Networks

Jean-Pierre Hubaux, Levente Buttyan

Naouel Ben Salem, Levente Buttyan, Jean-Pierre Hubaux and Markus Jakobsson abstract: In multi-hop cellular networks, the existence of a communication link between the mobile station and the base station is not required: a mobile station that has no direct connection with a base station can use other mobile stations as relays. Compared with conventional (single-hop) cellular networks, this new generation can lead to a better usage of the available spectrum and to a reduction of infrastructure costs. However,

2003

A Charging and Rewarding Scheme for Packet Forwarding

Jean-Pierre Hubaux, Levente Buttyan, Naouel Ben Salem

In multi-hop cellular networks, data packets have to be relayed hop by hop from a given mobile station to a base station and vice-versa. This means that the mobile stations must accept to forward information for the benefit of other stations. In this paper, we propose an incentive mechanism that is based on a charging/rewarding scheme and that makes collaboration rational for selfish nodes. We base our solution on symmetric cryptography to cope with the limited resources of the mobile stations. We provide a

2003

Impact of Interferences on Connectivity in Ad Hoc Networks

Patrick Thiran

We study the impact of interferences on the connectivity of large-scale ad-hoc networks, using percolation theory. We assume that a bi-directional connection can be set up between two nodes if the signal to noise ratio at reception is larger than some threshold. The noise is the sum of the contribution of interferences from all other nodes, weighted by a coefficient g, and of a background noise. We find that there is a critical value of g above which the network is made of disconnected clusters of nodes. We

2003

Mobility Helps Peer-to-Peer Security

Jean-Pierre Hubaux, Levente Buttyan, Srdan Capkun

We propose a straightforward technique to provide peer-to-peer security in mobile networks. We show that far from being a hurdle, mobility can be exploited to set up security associations among users. We leverage on the temporary vicinity of users, during which appropriate cryptographic protocols are run. We illustrate the operation of the solution in two scenarios, both in the framework of mobile ad hoc networks. In the first scenario, we consider fully self-organized security: users authenticate each othe

2003

Connectivity in ad-hoc and hybrid networks

Patrick Thiran

We consider a large-scale wireless network, but with a low density of nodes per unit area. Interferences are then less critical, contrary to connectivity. This paper studies the latter property for both a purely ad-hoc network and a hybrid network, where fixed base stations can be reached in multiple hops. We assume here that power constraints are modeled by a maximal distance above which two nodes are not (directly) connected. We find that the introduction of a sparse network of base stations does signific

2002

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Related publications (13)

Nonlinear periodic orbit solutions and their bifurcation structure at the origin of soliton hopping in coupled microresonators

Springer Science and Business Media LLC2026

Enhancing the Receiver-Driven Transport Paradigm with Sender Congestion Information

EPFL2025

Edge state optical frequency combs in the microresonator based Su-Schrieffer-Heeger model

Tobias Kippenberg, Xinru Ji, Alexey Tikan, Aleksandr Tusnin

We demonstrate the first observation of optical frequency combs at the edge state of the Su-Schrieffer-Heeger model. We show soliton-induced edge-bulk interaction and edge-state hopping. ...

Optical Society of America2023