Portrait of Ramachandran Ramjee

Ramachandran Ramjee

Principal Researcher


Ramachandran Ramjee is currently a Principal Researcher at Microsoft Research, India.

Prior to joining Microsoft, Ramjee spent ten years at Bell Labs, USA as a technical manager and a distinguished member of technical staff. His research interests include systems, networking, wireless and mobile computing. He has published over 75 papers and is a co-inventor on over 40 patents in these areas.

He is the recipient of several best paper awards and the 2010 Thomas Alva Edison patent award. He has taught two graduate-level courses in wireless networks as an adjunct faculty at Columbia University. He is an ACM Distinguished Scientist and a Fellow of the IEEE.

Ramachandran received his B.Tech in Computer Science from IIT Madras, and his M.S./Ph.D. in Computer Science from University of Massachusetts, Amherst.




Established: December 1, 2015

Seabed is a project to provide analytics over encrypted Big Data. The challenge is to develop fast yet secure cryptographic techniques that support a suite of applications such as Business Intelligence tools and large-scale Machine Learning frameworks. Towards this, we have developed two novel cryptographic techniques:a high-performance, additive symmetric homomorphic scheme (ASHE) and Splayed ASHE (SPLASHE), an encryption scheme that thwarts frequency analysis-based attacks. We have built Seabed into Apache Spark and we show that we…


Established: July 12, 2012

Many networked applications that run in the background on a mobile device incur significant energy drains when using the cellular radio interface for communication. This is mainly due to the radio-tail, where the cellular radio remaining in a high energy state for up to 20s after each communication spurt. In order to cut down energy consumption, many recent devices employ fast dormancy, a feature that forces the client radio to quickly go into a low…

Green Spaces

Established: July 1, 2010

Connecting the Next Billion Users to the Broadband Internet. The number of broadband Internet subscribers in India in July 2015 is only 113 million, or less than 10% of India’s population. To extend the availability of broadband Internet to the next billion users, Indian government is deploying the National Optical Fiber Network (NOFN), laying over a million miles of fiber optic cables. However, NOFN will still not reach the 600,000 villages, each of which can…


Established: December 4, 2009

Recognizing the twin trends of a rapid growth of cellular data services and the commoditization of WiFi WLAN technology, Cool-Tether proposes an architecture for ubiquitous and affordable connectivity by harnessing mobile smartphones to create WiFi hotspots on the fly. Cool-Tether optimizes heavily for battery energy consumption on the smartphones, resulting in a 38%-72% savings in energy consumption compared to prior energy-agnostic solutions for tethering.


Established: October 2, 2009

To reduce energy wastage by idle desktop computers in enterprise environments, the typical approach is to put a computer to sleep during long idle periods (e.g., overnight), with a proxy employed to reduce user disruption by maintaining the computer’s network presence at some minimal level. However, the Achilles’ heel of the proxy-based approach is the inherent trade-off between the functionality of maintaining network presence and the complexity of application-specific customization. We present LiteGreen, a system…


Established: June 1, 2009

Content Compression in Networks With the advent of globalization, networked services have a global audience. For example, a large corporation today may have branch offices at dozens of cities around the globe. In such a setting, the corporation's IT admins and network planners face a dilemma. On the one hand, they could centralize or concentrate the servers that power the corporation's IT services (e.g., email servers, file servers) at one or a small number of…


Established: December 26, 2008

The Nericell project focuses on road and traffic monitoring using an ensemble of mobile smartphones carried by people in normal course. The vision is that when a user who is participating in Nericell puts their phone in their pocket and starts driving, software on the phone will automatically monitor road and traffic conditions along their drive, and convey this information to a service in the cloud for aggregation and reporting. A key aspect of Nericell is…














Selected Recent Talks


Selected Press Coverage

Research Activities

Professional Activities

I co-organized the MSR India Summer School on Wireless Networking (at IISc in June 2014) and the First Mysore Park Workshop on Building and Programming the Cloud (January 2010, Infosys Campus, Mysore, India).

I served as the Associate Editor of IEEE/ACM Transactions on Networking (2006-2009), Area Editor of ACM SIGMOBILE MC2R (2004-2005), Associate Editor of IEEE Transactions on Mobile Computing (2001-2006) and Technical Editor of IEEE Wireless Communications Magazine (1999-2006).

I served as the Program Co-chair of COMSNETS 2014, ACM CORONET 2011, ACM MOBICOM 2006, and IEEE ICNP 2004. I served as the General Co-chair of WICON 2006. Recent service on conference program committees include:

  • ACM MOBICOM 2015, 2012, 2011, 2010 (TPC Member)
  • ACM SIGCOMM 2010 (TPC Member)
  • ACM SIGMETRICS 2011 (TPC Member)
  • IEEE INFOCOM 2010, 2008 (TPC Area Chair)
  • ACM SENSYS 2008 (TPC Member)
  • IEEE ICNP 2016 (TPC Area Chair)
  • ACM MOBIHOC 2016, 2013 (TPC Member)


I taught two graduate courses “Wireless and Mobile Networking I & II” (Spring’03 and Fall’03) in the Electrical Engineering Department at Columbia University, New York.


  • Ph.D. Computer Science, University of Massachusetts, Amherst, 1997
    Title: Supporting Connection Mobility in Wireless Networks
    Advisors: Prof. Jim Kurose and Prof. Don Towsley.
  • M.S., Computer Science, University of Massachusetts, Amherst, 1994
    Title: Adaptive Playout Mechanisms for Packetized Audio Applications in Wide-Area Networks
    Advisors: Prof. Jim Kurose and Prof. Don Towsley.
  • B.Tech., Computer Science and Engineering, Indian Institute of Technology, Madras, 1992.