July 2013 - talks - lists.cs.princeton.edu

P Jiang FPO
by Melissa M. Lawson 30 Jul '13

30 Jul '13

Peng Jiang will present his FPO on Monday August 5 at 11 AM in 101 Carl Icahn (Note Location!). The members of his committee are: Mona Singh, advisor; Olga Troyanskaya and Hilary Coller, readers; Gertrud Schupbach and John Storey, nonreaders. A copy of his thesis, "Combinatorial code analysis for understanding biological regulation", is on display in Room 310. Everyone is invited to attend his talk.

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3:30pm Wed Jul 24 talk on cellular networks by Erran Li (Bell Labs) in CS 402
by Jennifer Rexford 24 Jul '13

24 Jul '13

Speaker: Dr. Erran Li, Bell Labs Title: Making Cellular Networks Scalable and Flexible through Design-in-the-Large Date/time: 3:30-4:30pm Wednesday July 24 Location: 402 in the CS building Abstract: The rapid penetration of smart phones has put tremendous stress on cellular data networks. To understand the fundamental limitations of current cellular network architecture, I will first summarize my work on scalable network monitoring primitives and root cause analysis of performance problems. This work became a key part of the Alcatel-Lucent Wireless Network Guardian 9900 product. Our measurement study reveals that our mobile user experiences are hampered by the lack of access bandwidth at radio access networks and the inflexibility of cellular core networks. I will then address the two key problems through the principle of design-in-the-large. (1) To scale access bandwidth at radio access networks, I will present the design and prototype of Argos, a base station architecture that employs an unprecedented number of antennas simultaneously to serve a smaller number of mobile devices in the same band of frequencies. Both analysis and early experimental results suggest this design can lead to orders of magnitude increase in both spectral and energy efficiency. (2) To enable flexible provisioning of fine-grained policies at cellular core networks, I will summarize the design and prototype of SoftCell, a scalable software-defined cellular core network architecture. SoftCell achieves scalability through asymmetric edge design and selective multi-dimensional aggregation in the data plane and switch offloading in the control plane. Evaluations based on real LTE network traces show that a SoftCell controller can handle a network of thousands of base stations. This is joint work with collaborators at Princeton, Rice, Yale, and Bell Labs.

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Re: [talks] 2pm Thu Jul 25 data center networking talk by Kyriakos Zarifis (USC) in CS 402
by Srinivas Narayana 23 Jul '13

23 Jul '13

Speaker: Kyriakos Zarifis, University of Southern California (USC) Title: Don't Drop, Detour! Date/time: 2-2.30pm, Thursday July 25 Location: 402 in the CS building Abstract: Today's data centers must support a range of workloads with different demands. While existing approaches handle routine traffic smoothly, ephemeral but intense hotspots cause excessive packet loss and severely degrade performance. This loss occurs even though the congestion is typically highly localized, with spare buffer capacity available at nearby switches. In this talk, we argue that switches should share buffer capacity to effectively handle this spot congestion without the latency or monetary hit of deploying large buffers at individual switches. Specifically, we present DIBS, a mechanism that achieves a near lossless network without requiring additional buffers. Using DIBS, a congested switch detours excess packets to neighboring switches to avoid dropping them. We implement DIBS in hardware, on software routers in a testbed, and in simulation, and we demonstrate that it reduces the 99th percentile of query completion time by 85%, with very little impact on background traffic. Speaker bio (from his webpage): Kyriakos Zarifis is a 1st year PhD student in the Networked Systems Lab at the University of Southern California. Previously he worked as a networking researcher at the International Computer Science Institute at Berkeley, where he also dedicated part of his time maintaining NOX. He holds an M.Sc. in Internetworking from Kungliga Tekniska Högskolan and a Ptychion (B.Sc.) from the Department of Informatics and Telecommunications of the University of Athens.

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3:30pm Wed Jul 24 talk on cellular networks by Erran Li (Bell Labs) in CS 402
by Jennifer Rexford 17 Jul '13

17 Jul '13

Speaker: Dr. Erran Li, Bell Labs Title: Making Cellular Networks Scalable and Flexible through Design-in-the-Large Date/time: 3:30-4:30pm Wednesday July 24 Location: 402 in the CS building Abstract: The rapid penetration of smart phones has put tremendous stress on cellular data networks. To understand the fundamental limitations of current cellular network architecture, I will first summarize my work on scalable network monitoring primitives and root cause analysis of performance problems. This work became a key part of the Alcatel-Lucent Wireless Network Guardian 9900 product. Our measurement study reveals that our mobile user experiences are hampered by the lack of access bandwidth at radio access networks and the inflexibility of cellular core networks. I will then address the two key problems through the principle of design-in-the-large. (1) To scale access bandwidth at radio access networks, I will present the design and prototype of Argos, a base station architecture that employs an unprecedented number of antennas simultaneously to serve a smaller number of mobile devices in the same band of frequencies. Both analysis and early experimental results suggest this design can lead to orders of magnitude increase in both spectral and energy efficiency. (2) To enable flexible provisioning of fine-grained policies at cellular core networks, I will summarize the design and prototype of SoftCell, a scalable software-defined cellular core network architecture. SoftCell achieves scalability through asymmetric edge design and selective multi-dimensional aggregation in the data plane and switch offloading in the control plane. Evaluations based on real LTE network traces show that a SoftCell controller can handle a network of thousands of base stations. This is joint work with collaborators at Princeton, Rice, Yale, and Bell Labs.

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