Puneet Sharma

Multi-homed, mobile wireless computing and communication devices can spontaneously form communities to logically combine and share the bandwidth of each other's wide-area communication links using inverse multiplexing. But membership in such a community can be highly dynamic, as devices and their associated WAN links randomly join and leave the community. We identify the issues and tradeoffs faced in designing a decentralized inverse multiplexing system in this challenging setting, and determine precisely how heterogeneous WAN links should be characterized, and when they should be added to, or deleted from, the shared pool. We then propose methods of choosing the appropriate channels on which to assign newly-arriving application flows. Using video traffic as a motivating example, we demonstrate how significant performance gains can be realized by adapting allocation of the shared WAN channels to specific application requirements. Our simulation and experimentation results show that collaborative bandwidth aggregation systems are, indeed, a practical and compelling means of achieving high-speed Internet access for groups of wireless computing devices beyond the reach of public or private access points.

Abstract—Distributed computing has been widely embraced as a cost-effective means of performing compute-intensive tasks by pooling the computational resources of collaborating sys-tems. We envision the emergence of an analogous approach to communication resource sharing ...

Abstract—Distributed computing has been widely embraced as a cost-effective means of performing compute-intensive tasks by pooling the computational resources of collaborating sys-tems. We envision the emergence of an analogous approach to communication resource sharing ...

Energy efficiency is becoming increasingly important in the operation of networking infrastructure, especially in enterprise and data center networks. Researchers have proposed several strategies for energy management of networking devices. However, we need a comprehensive characterization of power consumption by a variety of switches and routers to accurately quantify the savings from the various power savings schemes. In this paper, we first describe the hurdles in network power instrumentation and present a power measurement study of a variety of networking gear such as hubs, edge switches, core switches, routers and wireless access points in both stand-alone mode and a production data center. We build and describe a benchmarking suite that will allow users to measure and compare the power consumed for a large set of common configurations at any switch or router of their choice. We also propose a network energy proportionality index, which is an easily measurable metric, to compare power consumption behaviors of multiple devices.

Efficient resource discovery based on dynamic attributes such as CPU utilization and available bandwidth is a cru-cial problem in the deployment of computing grids. Exist-ing solutions are either centralized or unable to answer ad-vanced resource queries (eg, range queries) ...

ABSTRACT Efficient discovery of grid services is essential for the success of grid computing. The standardization of grids based on web services has resulted in the need for scalable web service discovery mechanisms to be deployed in grids Even though UDDI has been the ...

Information Sciences Institute University of Southern California 4676 Admiralty Way Marina del Rey, CA 90291 Ph: 310-822-1511 ext. 742 Fax: 310-823-6714 puneet@isi.edu ... Deborah Estrin Information Sciences Institute University of Southern California 4676 Admiralty Way ...

Soft state protocols use periodic refresh messages to keep the network state alive while adapting to changing network conditions; this has raised concerns regarding the scalability of protocols that use the soft state approach. In existing soft state protocols, the values of the timers that control the sending of these messages, and the timers for aging out state, are chosen by matching empirical observations with desired recovery and response times. These fixed timer-values fail because they use time as a metric for bandwidth; they adapt neither to (1) the wide range of link speeds that exist in most wide-area internets, nor to (2) fluctuations in the amount of network state over time. We propose and evaluate a new approach in which timer-values adapt dynamically to the volume of control traffic and available bandwidth on the link. The essential mechanisms required to realize this scalable timers approach are: (1) dynamic adjustment of the senders' refresh rate so that the bandwidth allocated for control traffic is not exceeded, and (2) estimation of the senders' refresh rate at the receiver in order to determine when the state can be timed-out and deleted. The refresh messages are sent in a round robin manner not exceeding the bandwidth allocated to the control traffic, and taking into account the message priorities. We evaluate two receiver estimation methods for dynamically adjusting network state timeout values: (1) counting of the rounds and (2) exponential weighted moving average

Existing multicast routing mechanisms were intended for use within regions where a group is widely represented or bandwidth is universally plentiful. When group members, and senders to those group members, are distributed sparsely across a wide area, these schemes are ...

Puneet Sharma Information Sciences Institute University of Southern California 4676 Admiralty Way Marina del Rey, CA 90291 Ph: 310-822-1511 ext. 742 Fax: 310-823-6714 puneet@isi.edu ... Deborah Estrin Information Sciences Institute University of Southern California 4676 ...

Puneet Sharma Information Sciences Institute University of Southern California 4676 Admiralty Way Marina del Rey, CA 90291 Ph: 310-822-1511 ext. 742 Fax: 310-823-6714 puneet@isi.edu ... Deborah Estrin Information Sciences Institute University of Southern California 4676 ...

Abstract Leakage power has become one of the most critical design concerns for the system level chip designer. While lowered supplies (and consequently, lowered threshold voltage) and aggressive clock gating can achieve dynamic power reduction, these techniques ...

Abstract Leakage power has become one of the most critical design concerns for the system level chip designer. While lowered supplies (and consequently, lowered threshold voltage) and aggressive clock gating can achieve dynamic power reduction, these techniques ...