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Displaying 1-34 out of 34 total
High-Performance Mobile Internet
Found in: IEEE Internet Computing
By Anirban Mahanti,Subhabrata Sen
Issue Date:January 2014
pp. 8-11
The ongoing growth in mobile data traffic has sparked the interest of several stakeholders, including users, application developers, network operators, content providers, businesses, and regulatory authorities. Network operators are making significant inve...
   
TOP: Tail Optimization Protocol For Cellular Radio Resource Allocation
Found in: Network Protocols, IEEE International Conference on
By Feng Qian, Zhaoguang Wang, Alexandre Gerber, Z. Morley Mao, Subhabrata Sen, Oliver Spatscheck
Issue Date:October 2010
pp. 285-294
In 3G cellular networks, the release of radio resources is controlled by inactivity timers. However, the timeout value itself, also known as the tail time, can last up to 15 seconds due to the necessity of trading off resource utilization efficiency for lo...
 
Broadcast on Demand: Efficient and Timely Dissemination of Data in Mobile Environments
Found in: Real-Time and Embedded Technology and Applications Symposium, IEEE
By Ping Xuan, Subhabrata Sen, Oscar Gonzalez, Jesus Fernandez, Krithi Ramamritham
Issue Date:June 1997
pp. 38
The demand for efficient, scalable and cost effective mobile information access systems is rapidly growing. Radio frequency broadcast plays a major role in mobile computing, and there is a need to provide service models for broadcasting information accordi...
 
An in-depth study of LTE: effect of network protocol and application behavior on performance
Found in: Proceedings of the ACM SIGCOMM 2013 conference on SIGCOMM (SIGCOMM '13)
By Feng Qian, Junxian Huang, Oliver Spatscheck, Qiang Xu, Subhabrata Sen, Yihua Guo, Yuanyuan Zhou, Z. Morley Mao
Issue Date:August 2013
pp. 363-374
With lower latency and higher bandwidth than its predecessor 3G networks, the latest cellular technology 4G LTE has been attracting many new users. However, the interactions among applications, network transport protocol, and the radio layer still remain u...
     
Screen-off traffic characterization and optimization in 3G/4G networks
Found in: Proceedings of the 2012 ACM conference on Internet measurement conference (IMC '12)
By Feng Qian, Junxian Huang, Oliver Spatscheck, Subhabrata Sen, Z. Morley Mao
Issue Date:November 2012
pp. 357-364
Today's cellular systems operate under diverse resource constraints: limited frequency spectrum, network processing capability, and handset battery life. We consider a novel and important factor, handset screen status, i.e., whether the screen is on or off...
     
Characterizing data usage patterns in a large cellular network
Found in: Proceedings of the 2012 ACM SIGCOMM workshop on Cellular networks: operations, challenges, and future design (CellNet '12)
By Alexandre Gerber, Guy Jacobson, Nick Duffield, Patrick Haffner, Shobha Venkataraman, Subhabrata Sen, Wen-Ling Hsu, Yu Jin, Zhi-Li Zhang
Issue Date:August 2012
pp. 7-12
Using heterogeneous data sources collected from one of the largest 3G cellular networks in the US over three months, in this paper we investigate the usage patterns of mobile data users. We observe that data usage across mobile users are highly uneven. Mos...
     
A close examination of performance and power characteristics of 4G LTE networks
Found in: Proceedings of the 10th international conference on Mobile systems, applications, and services (MobiSys '12)
By Alexandre Gerber, Feng Qian, Junxian Huang, Oliver Spatscheck, Subhabrata Sen, Z. Morley Mao
Issue Date:June 2012
pp. 225-238
With the recent advent of 4G LTE networks, there has been increasing interest to better understand the performance and power characteristics, compared with 3G/WiFi networks. In this paper, we take one of the first steps in this direction. Using a publicly ...
     
Web caching on smartphones: ideal vs. reality
Found in: Proceedings of the 10th international conference on Mobile systems, applications, and services (MobiSys '12)
By Alexandre Gerber, Feng Qian, Jeffrey Erman, Junxian Huang, Kee Shen Quah, Oliver Spatscheck, Subhabrata Sen, Zhuoqing Mao
Issue Date:June 2012
pp. 127-140
Web caching in mobile networks is critical due to the unprecedented cellular traffic growth that far exceeds the deployment of cellular infrastructures. Caching on handsets is particularly important as it eliminates all network-related overheads. We perfor...
     
Periodic transfers in mobile applications: network-wide origin, impact, and optimization
Found in: Proceedings of the 21st international conference on World Wide Web (WWW '12)
By Junxian Huang, Oliver Spatscheck, Subhabrata Sen, Zhuoqing Mao, Alexandre Gerber, Feng Qian, Yudong Gao, Zhaoguang Wang
Issue Date:April 2012
pp. 51-60
Cellular networks employ a specific radio resource management policy distinguishing them from wired and Wi-Fi networks. A lack of awareness of this important mechanism potentially leads to resource-inefficient mobile applications. We perform the first netw...
     
A Modular Machine Learning System for Flow-Level Traffic Classification in Large Networks
Found in: ACM Transactions on Knowledge Discovery from Data (TKDD)
By Patrick Haffner, Subhabrata Sen, Yu Jin, Zhi-Li Zhang, Jeffrey Erman, Nick Duffield
Issue Date:March 2012
pp. 1-34
The ability to accurately and scalably classify network traffic is of critical importance to a wide range of management tasks of large networks, such as tier-1 ISP networks and global enterprise networks. Guided by the practical constraints and requirement...
     
Demo: mobile application resource optimizer (ARO)
Found in: Proceedings of the 9th international conference on Mobile systems, applications, and services (MobiSys '11)
By Alexandre Gerber, Feng Qian, Oliver Spatscheck, Subhabrata Sen, Zhaoguang Wang, Zhuoqing Mao
Issue Date:June 2011
pp. 369-370
Due to their thin size, vivid colors, high contrast and power efficiency, OLED and its variants such as AMOLED screens are increasingly replacing traditional LCD screens in mobile phones (eg. Google Nexus One, Samsung Galaxy S phones). However, the power e...
     
Profiling resource usage for mobile applications: a cross-layer approach
Found in: Proceedings of the 9th international conference on Mobile systems, applications, and services (MobiSys '11)
By Alexandre Gerber, Feng Qian, Oliver Spatscheck, Subhabrata Sen, Zhaoguang Wang, Zhuoqing Mao
Issue Date:June 2011
pp. 321-334
Despite the popularity of mobile applications, their performance and energy bottlenecks remain hidden due to a lack of visibility into the resource-constrained mobile execution environment with potentially complex interaction with the application behavior....
     
NEVERMIND, the problem is already fixed: proactively detecting and troubleshooting customer DSL problems
Found in: Proceedings of the 6th International COnference (Co-NEXT '10)
By Alexandre Gerber, Nick Duffield, Patrick Haffner, Subhabrata Sen, Yu Jin, Zhi-Li Zhang
Issue Date:November 2010
pp. 1-12
Traditional DSL troubleshooting solutions are reactive, relying mainly on customers to report problems, and tend to be labor-intensive, time consuming, prone to incorrect resolutions and overall can contribute to increased customer dissatisfaction. In this...
     
Flowroute: inferring forwarding table updates using passive flow-level measurements
Found in: Proceedings of the 10th annual conference on Internet measurement (IMC '10)
By Alexandre Gerber, Amogh Dhamdhere, Carsten Lund, Cheng Ee, Lee Breslau, Nicholas Duffield, Subhabrata Sen
Issue Date:November 2010
pp. 315-321
The reconvergence of routing protocols in response to changes in network topology can impact application performance. While improvements in protocol specification and implementation have significantly reduced reconvergence times, increasingly performance-s...
     
Characterizing radio resource allocation for 3G networks
Found in: Proceedings of the 10th annual conference on Internet measurement (IMC '10)
By Alexandre Gerber, Feng Qian, Oliver Spatscheck, Subhabrata Sen, Zhaoguang Wang, Zhuoqing Morley Mao
Issue Date:November 2010
pp. 137-150
3G cellular data networks have recently witnessed explosive growth. In this work, we focus on UMTS, one of the most popular 3G mobile communication technologies. Our work is the first to accurately infer, for any UMTS network, the state machine (both trans...
     
HTTP in the home: it is not just about PCs
Found in: Proceedings of the 2010 ACM SIGCOMM workshop on Home networks (HomeNets '10)
By Alexandre Gerber, Jeffrey Erman, Subhabrata Sen
Issue Date:September 2010
pp. 43-48
HTTP (Hypertext Transport Protocol) was originally primarily used for human-initiated client-server communications launched from web browsers, traditional computers and laptops. However, today it has become the protocol of choice for a bewildering range of...
     
Impact of prefix-match changes on IP reachability
Found in: Proceedings of the 9th ACM SIGCOMM conference on Internet measurement conference (IMC '09)
By Aman Shaikh, Jennifer Rexford, Subhabrata Sen, Yaping Zhu
Issue Date:November 2009
pp. 235-241
Although most studies of Internet routing treat each IP address block (or prefix) independently, the relationship between prefixes is important because routers ultimately forward packets based on the "longest-matching prefix." In fact, the most-specific pr...
     
TCP revisited: a fresh look at TCP in the wild
Found in: Proceedings of the 9th ACM SIGCOMM conference on Internet measurement conference (IMC '09)
By Alexandre Gerber, Feng Qian, Oliver Spatscheck, Subhabrata Sen, Walter Willinger, Zhuoqing Morley Mao
Issue Date:November 2009
pp. 76-89
Since the last in-depth studies of measured TCP traffic some 6-8 years ago, the Internet has experienced significant changes, including the rapid deployment of backbone links with 1-2 orders of magnitude more capacity, the emergence of bandwidth-intensive ...
     
Multicast redux: a first look at enterprise multicast traffic
Found in: Proceedings of the 1st ACM workshop on Research on enterprise networking (WREN '09)
By Alexandre Gerber, Elliott Karpilovsky, Lee Breslau, Subhabrata Sen
Issue Date:August 2009
pp. 101-104
IP multicast, after spending much of the last 20 years as the subject of research papers, protocol design efforts and limited experimental usage, is finally seeing significant deployment in production networks. The efficiency afforded by one-to-many networ...
     
Modeling and understanding end-to-end class of service policies in operational networks
Found in: Proceedings of the ACM SIGCOMM 2009 conference on Data communication (SIGCOMM '09)
By Carsten Lund, Mark Lyn, Sanjay G. Rao, Subhabrata Sen, Yu-Wei Eric Sung
Issue Date:August 2009
pp. 101-104
Business and economic considerations are driving the extensive use of service differentiation in Virtual Private Networks (VPNs) operated for business enterprises today. The resulting Class of Service (CoS) designs embed complex policy decisions based on t...
     
Scalable VPN routing via relaying
Found in: Proceedings of the 2008 ACM SIGMETRICS international conference on Measurement and modeling of computer systems (SIGMETRICS '08)
By Alexandre Gerber, Carsten Lund, Changhoon Kim, Dan Pei, Subhabrata Sen
Issue Date:June 2008
pp. 305-305
Enterprise customers are increasingly adopting MPLS (Multiprotocol Label Switching) VPN (Virtual Private Network) service that offers direct any-to-any reachability among the customer sites via a provider network. Unfortunately this direct reachability mod...
     
Minimizing collateral damage by proactive surge protection
Found in: Proceedings of the 2007 workshop on Large scale attack defense (LSAD '07)
By Bill Lin, Jerry Chou, Oliver Spatscheck, Subhabrata Sen
Issue Date:August 2007
pp. 63-70
Existing mechanisms for defending against distributed denial-of-service (DDoS) attacks are generally reactive in nature. However, the onset of large-scale bandwidth-based attacks can occur suddenly, potentially knocking out substantial parts of a network b...
     
GRE encapsulated multicast probing: a scalable technique for measuring one-way loss
Found in: Proceedings of the 2007 ACM SIGMETRICS international conference on Measurement and modeling of computer systems (SIGMETRICS '07)
By Lee Breslau, Nick G. Duffield, Subhabrata Sen, Yu Gu
Issue Date:June 2007
pp. 355-356
We develop techniques for estimating one-way loss from a measurement host to network routers which exploit commonly implemented features on commercial routers and do not require any new router capabilities. The work addressesthe problem of scalably perform...
     
On unbiased sampling for unstructured peer-to-peer networks
Found in: Proceedings of the 6th ACM SIGCOMM on Internet measurement (IMC '06)
By Daniel Stutzbach, Nick Duffield, Reza Rejaie, Subhabrata Sen, Walter Willinger
Issue Date:October 2006
pp. 27-40
This paper addresses the difficult problem of selecting representative samples of peer properties (eg degree, link bandwidth, number of files shared) in unstructured peer-to-peer systems. Due to the large size and dynamic nature of these systems, measuring...
     
VMScope: a virtual multicast VPN performance monitor
Found in: Proceedings of the 2006 SIGCOMM workshop on Internet network management (INM '06)
By Bill Fenner, Chris Chase, Lee Breslau, Nick Duffield, Subhabrata Sen, Yanhua Mao
Issue Date:September 2006
pp. 59-64
The growth of one-to-many applications in enterprise networks is fueling the demand for VPNs to support multicast applications. The deployment of such a Multicast VPN service creates the need for appropriate management tools and techniques including perfor...
     
ACAS: automated construction of application signatures
Found in: Proceeding of the 2005 ACM SIGCOMM workshop on Mining network data (MineNet '05)
By Dongmei Wang, Oliver Spatscheck, Patrick Haffner, Subhabrata Sen
Issue Date:August 2005
pp. 197-202
An accurate mapping of traffic to applications is important for a broad range of network management and measurement tasks. Internet applications have traditionally been identified using well-known default server network-port numbers in the TCP or UDP heade...
     
Video quality estimation for internet streaming
Found in: Special interest tracks and posters of the 14th international conference on World Wide Web (WWW '05)
By Amy Reibman, Jacobus Van der Merwe, Subhabrata Sen
Issue Date:May 2005
pp. 1168-1169
The capability to change user agent while working is starting to appear in state of the art mobile computing due to the proliferation of different kinds of devices, ranging from personal wireless devices to desktop computers, and to the consequent necessit...
     
Class-of-service mapping for QoS: a statistical signature-based approach to IP traffic classification
Found in: Proceedings of the 4th ACM SIGCOMM conference on Internet measurement (IMC '04)
By Matthew Roughan, Nick Duffield, Oliver Spatscheck, Subhabrata Sen
Issue Date:October 2004
pp. 135-148
The ability to provide different Quality of Service (QoS) guarantees to traffic from different applications is a highly desired feature for many IP network operators, particularly for enterprise networks. Although various mechanisms exist for providing QoS...
     
Online identification of hierarchical heavy hitters: algorithms, evaluation, and applications
Found in: Proceedings of the 4th ACM SIGCOMM conference on Internet measurement (IMC '04)
By Carsten Lund, Nick Duffield, Subhabrata Sen, Sumeet Singh, Yin Zhang
Issue Date:October 2004
pp. 101-114
In traffic monitoring, accounting, and network anomaly detection, it is often important to be able to detect high-volume traffic clusters in near real-time. Such heavy-hitter traffic clusters are often hierarchical (<i>ie</i>, they may occur at dif...
     
Analyzing peer-to-peer traffic across large networks
Found in: Proceedings of the second ACM SIGCOMM Workshop on Internet measurment workshop (IMW '02)
By Jia Wang, Subhabrata Sen
Issue Date:November 2002
pp. 137-150
The use of peer-to-peer (P2P) applications is growing dramaticaliy, particularly for sharing large video/audio files and software. In this paper, we analyze P2P traffic by measuring flow-level information collected at multiple border routers across a large...
     
Periodic broadcast and patching services: implementation, measurement, and analysis in an internet streaming video testbed
Found in: Proceedings of the ninth ACM international conference on Multimedia (MULTIMEDIA '01)
By Bing Wang, Don Towsley, Jim Kurose, Lixin Gao, Michael K. Bradshaw, Prashant Shenoy, Subhabrata Sen
Issue Date:September 2001
pp. 638-639
This demo presents an implementation of a content-based music retrieval system that can take a user's acoustic input (8-second clip of singing or humming) via a microphone and then retrieve the intended song from a database containing 13,000 candidate song...
     
Periodic broadcast and patching services: implementation, measurement, and analysis in an internet streaming video testbed
Found in: Proceedings of the ninth ACM international conference on Multimedia (MULTIMEDIA '01)
By Bing Wang, Don Towsley, Jim Kurose, Lixin Gao, Michael K. Bradshaw, Prashant Shenoy, Subhabrata Sen
Issue Date:September 2001
pp. 280-290
Multimedia streaming applications can consume a significant amount of server and network resources. Periodic broadcast and patching are two approaches that use multicast transmission and client buffering in innovative ways to reduce server and network load...
     
Periodic broadcast and patching services: implementation, measurement, and analysis in an Internet streaming video testbed
Found in: Proceedings of the 2001 ACM SIGMETRICS international conference on Measurement and modeling of computer systems (SIGMETRICS '01)
By Bing Wang, Don Towsley, Jim Kurose, Lixin Gao, Michael K. Bradshaw, Prashant Shenoy, Subhabrata Sen
Issue Date:June 2001
pp. 261-269
To evaluate the performance of a software design one must create a model of the software, together with the execution platform and configuration. Assuming that the "platform": (processors, networks, and operating systems) are specified by the designer, a g...
     
Incorporation of multimedia capabilities in distributed real-time applications
Found in: Proceedings of the workshop on Databases: active and real-time (CIKM '96)
By John A. Stankovic, Krithi Ramamritham, Oscar González, Subhabrata Sen
Issue Date:November 1996
pp. 5-9
The REMUS-II is a heterogeneous computing system-on-chip that consists of one or two coarse-grained dynamically reconfigurable processing units (RPUs) and an array of RISC processors (μPU). The RPUs are used for accelerating computation-intensive tasks,...
     
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