Showing papers by "Craig Partridge published in 2006"

Opportunistic spectrum access: challenges, architecture, protocols

Abstract: We consider the concept of opportunistic spectrum access (OSA) -- whereby radios identify unused portions of licensed spectrum, and utilize that spectrum without adverse impact on the primary licensees. OSA allows both dramatically higher spectrum utilization and near-zero deployment time, with an obvious and significant impact on both civilian and military communications. We discuss two broad classes of challenges to OSA: spectrum agility, which involves wideband sensing, opportunity identification, coordination and use; and policy agility, which enables regulatory policies to be applied dynamically using machine understandable policies. Focusing on spectrum agility, we present an architecture based on an OSA adaptation layer. We describe protocols for OSA, including a hole information protocol, idle channel selection and use, and an access protocol for the coordination channel. We present a simulation study, discuss insights, and show that even a simple protocol for opportunistic spectrum allocation can provide an order-of-magnitude performance improvement in throughput over a legacy system.

Systems and methods for incorporating information corresponding to an end-to-end transmission in determining access to a communication medium

Abstract: Systems and methods for incorporating information corresponding to an end-to-end transmission in determining access to a communication medium include: receiving a first data packet, said first data packet comprising information corresponding to a destination node; determining an intermediate node for said first data packet; and transmitting, to said intermediate node, a request-to-send (RTS) corresponding to said data packet, said RTS comprising information corresponding to said destination node.

Adaptive Dynamic Radio Open-source Intelligent Team (ADROIT): Cognitively-controlled Collaboration among SDR Nodes

Abstract: The ADROIT project is building an open-source software-defined data radio, intended to be controlled by cognitive applications. The goal is to create a system that enables teams of radios, where each radio both has its own cognitive controls and the ability to collaborate with other radios, to create cognitive radio teams. The desire to create cognitive radio teams, and the goal of having an open-source system, requires a rich and carefully architected system that provides great flexibility (enabling cognitive applications to change the radio's behavior) and also has a clear structure (both so that others may add or enhance the software, and also so that the system can be clearly modeled for cognitive applications). What follows is a summary of the ADROIT system and the key architectural features intended to enable cognitive radio teams.

JTP: An Energy-conscious Transport Protocol for Wireless Ad Hoc Networks

Abstract: : Within a recently developed low-power ad hoc network system, we present a transport protocol (JTP) whose goal is to reduce power consumption without trading off delivery requirements of applications. JTP has the following features: it is lightweight whereby end-nodes control in-network actions by encoding delivery requirements in packet headers; JTP enables applications to specify a range of reliability requirements, thus allocating the right energy budget to packets; JTP minimizes feedback control traffic from the destination by varying its frequency based on delivery requirements and stability of the network; JTP minimizes energy consumption by implementing in-network caching and increasing the chances that data retransmission requests from destinations hit these caches, thus avoiding costly source retransmissions; and JTP fairly allocates bandwidth among flows by backing off the sending rate of a source to account for in-network retransmissions on its behalf. Analysis and extensive simulations demonstrate the energy gains of JTP over one-size-fits-all transport protocols.

ACM SIGCOMM test of time paper award

Abstract: The ACM SIGCOMM Test of Time Award recognizes a paper published 10 to 12 years in the past in Computer Communications Review or any SIGCOMM sponsored or co-sponsored conference that is deemed to be an outstanding paper whose contents are still a vibrant and useful contribution today.The award is given annually and consists of a custom glass award and reprinting the paper in Computer Communication Review.The paper will be chosen by an award committee appointed by the SIGCOMM Award Committee Chair.We are now taking nominations and suggestions for the 2006 Test of Time Paper award for papers published between 1994 and 1996. Send your nominations and suggestions to Craig Partridge (craig@bbn.com) by June 1st.To assist in the process, a list of eligible papers has been put online at the SIGCOMM website at http://www.acm.org/sigs/sigcomm/tot/

"End-to-End Routing Behavior in the Internet," by Vern Paxson A retrospective review

Abstract: •• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • The 2006 ACM SIGCOMM Test of Time Award has been given to Vern Paxson for his paper, “End-to-End Routing Behavior in the Internet,” published in the 1996 proceedings of the ACM SIGCOMM Conference. The award “recognizes a paper published 10 to 12 years in the past … that is deemed to be an outstanding paper whose contents are still a vibrant and useful contribution today.” In this review, we try to explain why we picked this paper for the award. (In that light, we should note there were a number of outstanding papers that were strong contenders for the award).