Georgia Tech: Networking & Telecommunications Group


Current Research

  • Data Streaming (Professor Xu)
    Data streaming is concerned with processing a long stream of data items in one pass using a small working memory in order to answer a query regarding the stream. We are investigating novel paradigms and mechanisms that allow us to perform large-scale distributed data streaming on tens of thousands of high-speed links and nodes, and aggregate, compress, and interpret these streaming results, for better measurement and monitoring of large networks, which traditional data streaming algorithms do not provide.
  • Delay Tolerant Networks (Professors Ammar and Zegura)
    There exists many scenarios where the network becomes partitioned because of physical deterrents. In such scenarios, it will be beneficial if an intermediate node can buffer and carry a message until it has a chance to forward them. Our work is concerned with the development of a novel Message Ferrying (MF) scheme, inspired by its real life analog, that implements this store, carry and forward routing paradigm. In the MF scheme, a set of mobile nodes called message ferries take responsibility for carrying messages between disconnected nodes.
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  • Future Internet Architecture (Professor Feamster)
  • Intelligent route control (Professor Dovrolis)
    Intelligent Route Control (IRC) allows participating networks to avoid the inefficiencies and hotspots of the current Internet; by using multihoming, overlay routing, or a combination of both. IRC systems often optimize the cost and performance of outgoing traffic, based on measurement-driven dynamic path switching techniques. We are involved in the investigation of route oscillations caused by such a selfish behavior and in the improvement of the achieved end-to-end performance.
  • Internet measurement (Professors Dovrolis and Feamster)
  • Network estimation (Professor Xu)
    Traffic and loss matrices are the most important network performance statistics that need to be accurately measured and carefully monitored in an Internet service provider (ISP) network. The accuracy of existing techniques for estimating traffic matrix, which primarily try to infer from measureable network statistics such as Cisco NetFlow records, is not very high. We propose to develop novel statistical signal processing techniques that allow us to infer traffic and loss matrices as accurately as possible from the data we already have in hand.
  • Network security and operations (Professor Feamster)
    • Diagnosis and troubleshooting
    • Network monitoring, security, and defense [SIGCOMM '06 Paper]
    • Fault detection [rcc]
  • Overlay networks (Professors Ammar, Dovrolis and Zegura)
    Overlay networks help overcome functionality limitations of the Internet (like quality-of-service, wide-area multicast support), by forming a virtual network on top of the IP network within which the specialized overlay nodes collaborate. However, the onset of multiple overlay applications and the surge of overlay traffic, can lead to several problems, each which can lead to a deterioration in the overall system performance and stability. Moreover, the placement of overlay nodes and links tends to become complicated. Our group focuses on investigation of the multi-layer interaction, topology placement, the development of new overlay services and testbeds. [ NetFinder ]
  • Research NOC (Professors Clark and Feamster)
    • RNOC: Research Network Operations Center
  • Router buffer sizing (Professor Dovrolis)
    Packet buffers in router/switch interfaces constitute a central element of packet networks. The appropriate sizing of these buffers is an important and open research problem, given constraints on the minimum utilization, maximum loss rate, and maximum queueing delay. We investigate this problem and the tradeoff between the loss rate vs the queuing delay. We also address concerns over whether the buffer size can be smaller than the link's bandwidth-delay product, as small buffers lead to an increase in the loss rate and an associated deterioration in the performance of certain application.

Past Projects