Projects

7DS Resource sharing in wireless networks [Published Papers]
7DS is a disconnected wireless peer-to-peer network with the goal of information dissemination and resource sharing among devices in the network. 7DS exploits node mobility to increase data availability. Data can propagate from the Internet to mobile users and vice versa, offering high-latency versions of the web and email.

ADS Application and Desktop Sharing [Published Papers]
The aim of this project is to built an application and desktop sharing platform which is efficient, reliable, operating system independent, scales well, supports all applications and features true application sharing.

CINEMA Columbia InterNet Extensible Multimedia Architecture [Published Papers]
CINEMA is a full-featured VoIP and multimedia collaboration system, including a SIP proxy server, VoiceXML server, conference server, SIP-H.323 protocol gateway, and unified messaging server. The proxy server is designed to be highly scalable, and programmable using SIP servlets, sip-cgi and CPL.

DotSlash Web hotspot rescue system [Published Papers]
The DotSlash project aims to develop effective overload protection mechanisms for busy Web servers. Highly bursty Web requests may overwhelm a Web site and seriously degrade its service quality. This problem is often referred to as Slashdot effect. DotSlash automatically adds rescue servers to a web site during overload, without administrator intervention. In the current prototype, DotSlash supports both static web pages as well as web applications built on LAMP (Linux, Apache, MySQL, PHP).

FAA Improving training for air traffic controllers [Published Papers]
We are implementing a SIP-based infrastructure for training air traffic controllers in radio operations.

GloServ Global service discovery [Published Papers]
GloServ is a global service discovery architecture which uses the OWL ontology to classify services as well as map them onto nodes in a hybrid hierarchical and peer-to-peer network.

MassFilter Filtering gigabits of voice traffic [Published Papers]
We are developing techniques for evaluating the performance of large-scale firewalls for VoIP. These firewalls need to handle tens of thousands of concurrent calls, without leaking unauthorized packets or cutting of voice communications.

MobApp Personal, service and session mobility for multimedia applications [Published Papers]
Beyond terminal mobility, next-generation mobile systems need to support application-layer mobility that allows a single user to be reachable under one identifier even when using multiple devices (personal mobility), to change devices while maintaining configuration information and to move active sessions, possibly as components, among mobile and stationary devices.

NG911 Next-generation emergency calling for VoIP [Published Papers]
The NG911 project is developing a prototype for a next-generation emergency calling system suitable for VoIP. The system incorporates location determination, call routing and public safety answering point (PSAP) infrastructure.

NSIS Next steps in signaling [Published Papers]
As part of the IETF NSIS working group, we are contributing to a generic IP signaling protocol that separates the transport of the signaling from the application signaling (e.g., QoS, NAT traversal). Our current work focus on the NSIS transport layer protocol called General Internet Messaging Protocol for Signaling (GIMPS), NSIS operation over IP tunnels, and NSIS interaction with IP mobility and route change.

PBS Permission-Based Sending [Published Papers]
PBS is a new paradigm to prevent Denial-of-Service (DoS) attacks for all types of Internet applications, such as audio/video conversations and web services. PBS exploits control plane signaling protocol architecture (NSIS Signaling Layer Protocol) and secure authorization (permission) to send data for resource control.

SIMPLEstone Performance measurements for SIMPLE presence [Published Papers]
SIMPLEstone is a benchmark for presence systems based on the Session Initiation Protocol (SIP), commonly known as SIMPLE.

sipc SIP user agent [Published Papers]
sipc is a SIP user agent that can be used for Internet telephony calls. It supports a range of media types, such as audio, video, text, white board, desktop sharing, and can be extended easily to additional media types. In addition to multimedia communications, sipc supports presence indication, instant messaging, networked appliance control, real-time multimedia streaming (RTSP), networked resource discovery (SLP), third-party call control, Internet TV (SAP), location sensing, and emergency call handling. It can also interact with email clients and web browsers.

VoWi Voice over WiFi [Published Papers]
Supporting VoIP on WiFi (802.11) networks poses a number of challenges. The project is developing a new MAC protocol (dynamic PCF), fast layer-2 hand-off mechanisms and new duplicate address detection (DAD) algorithms that support a significantly larger number of sessions and drastically reduce the hand-off delays both for layer-2 and layer-3 hand-offs.

z2z Zeroconf-to-Zeroconf Toolkit [Published Papers]
Zeroconf-to-Zeroconf Toolkit (z2z) extends the reach of the Zeroconf service discovery (aka Bonjour by Apple) beyond local link. Yes, this means that it lets you access your iTunes music shares across the Internet.