| Short Biography |
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I am a Systems PhD
student working with Prof
Tzi-cker Chiueh in Experimental
Computer Systems Lab. I received an M.S. in Computer Science from Stony
Brook University (2000), and a B.Tech in Computer Science and
Engineering from Indian Institute
of Technology, Delhi (1998). During 2000-2002, I worked at Asera Inc,
now SEEC. I conduct research in the
areas of Enterprise-class Wireless Mesh Networks (specifically
dealing with capacity, security, fairness, deployment, and management
issues), and Self-Managed Network Storage (QoS, management, and
fault-tolerance issues).
My job search has successfully ended. I recently joined Google, Kirkland as a full-time employee.
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| Research |
- IEEE
802.11-based Multi-channel Wireless Mesh Network
- In this project, we
architected the first IEEE 802.11-compliant multi-hop wireless mesh
network that features bandwidth aggregation from multiple radio
channels, and traffic-aware network optimizations in form of interface
channel assignment and packet routing. The key applications for this
architecture are enterprise wireless backbone networking and ISP
last-mile networking.
- Redundancy-based
Secure Routing Protocol - We
devised a distributed route-packet crosschecking mechanism that can
quickly detect inconsistencies among route packets, and trace the
roots of these inconsistencies to specific nodes. The protocol
significantly enhances the availability of a multi-channel wireless
mesh network in presence of compromised, mis-configured, or broken
nodes.
- Stateful
Mesh Transport
Protocol - We developed a new
network-assisted transport protocol that works well in presence of
rapidly fluctuating link quality, bursty packet errors, and high
per-packet overheads as seen in multi-hop wireless mesh networks.
We further devised a coordinated congestion control mechanism that can
provide max-min fairness on top of 802.11-based wireless mesh
networks, despite presence of hidden nodes and arbitrary channel space
sharing by mesh nodes.
- Reconfigurable
Miniaturized Wireless Experimentation Testbed
-
We built a mobile wireless testbed that
can reside within a small physical space and still support true
multi-hopping. The testbed features per-experiment automatic remote
reconfiguration, hybrid ns-2 simulations (where native ns-2 scripts
and code can be executed with all wireless models replaced by physical
environment), mobile experimentation capability, advanced experimental
control such as pause / breakpoint / revert / inject fault, and 24x7
autonomous operations (including automatic re-charging).
- Video
Delivery over Wireless Mesh Networks -
In this project, we are devising various semi-reliable media delivery
techniques that can effectively deal with the fragile nature of
multi-hop wireless LANs. Specifically, we are exploring mechanisms
such as corrupted packet forwarding and selective lost packet
retransmission to improve overall video quality.
- Indoor
Wireless
Sensor Network for Radio Resource Management -
We built a self-configurable
indoor wireless monitoring network that guards an enterprise radio
space and aids its management. The system features MAC sequence
number-based spoof detection and provides an accurate radio channel
utilization map for the entire enterprise.
- Centralized
TCP Server
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CTCP server transparently splits all
outgoing/incoming TCP connections from an enterprise, and thus
provides the abstraction of a centralized TCP stack residing at an
enterprise gateway. The goals are to reduce administration efforts
involved in applying TCP/IP security patches, provide
generic/transparent proxy framework, provide infrastructure to write
honeypot applications, support hierarchical QoS, and provide
Aggregated TCP-based fair-bandwidth share to short-lived HTTP
connections.
- Generalized
Multi-Server Fair Queuing -
In this project, we are devising admission control and scheduling
algorithms to ensure fairness among flows being serviced by
overlapping sets of servers. The problem appears in several contexts
including QoS-guaranteed virtual storage servers, and web-hosting
management.
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| Refereed Publications |
- Architecture and Algorithms for an IEEE
802.11-based Multi-channel Wireless Mesh Network (A Raniwala, Prof
Chiueh) in proc of IEEE Infocom '05 [pdf]
[slides]
- MiNT-m: An Autonomous Mobile Wireless Experimentation Platform (P De, A Raniwala, R Krishnan, K Tatavarthi, N Syed, S Sharma, Prof Chiueh)to appear in proc of USENIX Mobisys '06
- MINT: A Miniaturized Network Testbed for
Mobile Wireless Research (P De, A Raniwala, S Sharma, Prof Chiueh) in proc of IEEE Infocom '05
[pdf]
- WShare: An Instant Secure Collaboration
Workspace over Ad hoc Wireless LAN (A Raniwala, G Zhang, J Zheng, A
Sridhar, Prof Chiueh) to appear in Intl Journal of Wireless and
Mobile Computing (IJWMC): Special Issue on Group Communications in Ad
hoc Networks, Issue 3, 2005 [ps]
- Evaluation of a Wireless Enterprise Backbone
Network Architecture (A Raniwala, Prof Chiueh) - in proc. of Hot
Interconnects 12, August '04 [pdf]
[slides]
- Centralized Channel Assignment and Routing Algorithms for Multi-channel
Wireless Mesh Networks (A Raniwala, K Gopalan Prof Chiueh) - in
ACM SIGMOBILE Mobile Computing and Communications Review (MC2R) April
'04 issue [pdf]
- Implementation of a Fault-tolerant Real-time
Network Attached Storage Device. (A
Raniwala, S Sharma, A Neogi and Prof Chiueh) in
proc. of 8th NASA GSC Conf on Mass Storage Systems and
Technology (MSST) March '00
[ps]
- Phoenix: A Low-power, Fault-tolerant,
Real-time Network Attached Storage Device. (A
Neogi, A Raniwala, Prof Chiueh ) in
ACM Multimedia '99 [ps]
Book Chapter/Magazine
Publications
-
IEEE 802.11-based Wireless Mesh
Networks (A Raniwala, T Chiueh) –(Invited) to appear in Wireless
Mesh Networking: Architectures, Protocols and Standards, Auerbach
Publications, CRC Press, 2006
- Design Requirements for a Multi-hop
Wireless Network Testbed (P De, A Raniwala,
S Sharma
, T Chiueh) –in IEEE Communications Magazine (Ad Hoc Sensor Nets
Series) Oct ’05
Posters
-
Architecting a high-capacity last-mile
wireless mesh network. (A Raniwala, Prof Chiueh) - Poster Session
in Mobicom '04 [pdf]
[poster]
- WShare: An Instant File and Application
Sharing System over Wireless LAN. (A Raniwala, G Zhang, J Zheng, A
Sridhar, Prof Chiueh) - Poster Session in MobiSys '03 [ps]
[poster]
|
|
| Manuscripts Under
Review |
- End-to-end Flow
Fairness over 802.11-based Wireless Mesh Networks (A Raniwala, P De, S
Sharma, R Krishnan, Prof Chiueh)
- Traffic and Security Monitoring of Enterprise Wireless LAN Traffic (G Wu, F Guo,
A
Raniwala, Prof Chiueh)
- Evaluation of a Stateful Transport
Protocol for Multi-channel Wireless Mesh Networks(A Raniwala,
S Sharma
,P De, T Chiueh)
- Coverage and Capacity Issues in Enterprise Wireless LAN Deployment
(A Raniwala, Prof Chiueh) [pdf]
- An Enterprise Network Defense Platform Based on Transparent TCP
Proxying (F Hsu, Prof Chiueh, J
Chen, A Raniwala) [pdf]
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| Unreferred Publications |
- Deployment Issues in Enterprise Wireless LANs
(A Raniwala) - Research Proficiency, SBU, '03 [pdf]
[slides]
- Hybrid mode 802.11 wireless LANs (A Raniwala)
- Graduate Research Conference, SBU, '03 [pdf]
[slides]
- Phoenix: A Low-power, Fault-tolerant,
Real-time Network Attached Storage Device. (A
Raniwala). MS Thesis, SBU, May '00
[ps]
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| Past Research |
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| Industry Projects |
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| Entrepreneurial
Efforts |
| Allego
- An electronic trading exchange for
transportation market: The objective of this project was to help a
Spain-based B2C start-up firm demonstrate the technical feasibility of
their portal. The wireless-enabled exchange was to act as reverse auction
platform to assist Transportation Service Providers auction their excess
capacity. Apart from building the prototype, we conducted market research,
helped in defining process and technical requirements, and demonstrated
the solution to potential investors.
Radius Communications -
Advised an Arizona-based networking startup in distilling the technical
issues for using wireless mesh networks to provide broadband access to a
235-units condominium complex
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| Reading
Seminar Slides |
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| More
about myself.. |
