Small-cells: These are smaller versions of macro base-stations that operate at lower powers. Femtocells are a type of small cells that reuse the cable backhaul and are used indoors. Small cell deployments are not coordinated but employ the same access technology as macro cells, resulting in several new challenges for interference and radio resource management that are different from those of WiFi. We have designed novel and efficient solutions in this respect that are applicable to small cells in general  and have also protyped them on an OFDMA-based network of four small cells (employing WiMAX).

  • “Joint Multi-cell Beamforming and Client Association in OFDMA Small-cell Networks”, J. Yoon, K. Sundaresan, M. Khojastepour, S. Rangarajan, S. Banerjee, IEEE Transactions on Mobile Computing, 2015.
  • “FluidNet: A Flexible Cloud-based Radio Access Network for Small Cells”, K. Sundaresan, M. Arslan, S. Singh, S. Rangarajan, S. Krishnamurthy, IEEE/ACM Transactions on Networking, 2015.
  • “iBUS: An Integrated Beamformer and Uplink Scheduler for OFDMA Femtocells”, M. Arslan, K. Sundaresan, S. Krishnamurthy, S. Rangarajan, IEEE/ACM Transactions on Networking, 2015.
  • "Software-defined Networking in Cellular Radio Access Networks: Potential and Challenges", M. Arslan, K. Sundaresan, S. Rangarajan, IEEE Communications Magazine, Special Issue on Extremely Dense Wireless Networks, Jan 2015.
  • "FluidNet: A Flexible Cloud-based Radio Access Network of Small Cells", K. Sundaresan, M. Arslan, S. Singh, S. Rangarajan, S. Krishnamurthy, ACM MOBICOM 2013.
  • "ProBeam: A Practical Multi-cell Beamforming System for OFDMA Small Cells", J. Yoon, K. Sundaresan, M. Khojastepour, S. Rangarajan, S. Banerjee, ACM MOBIHOC 2013.
  • "The Case for Re-configurable Backhaul for Cloud-RAN based Small cell Networks", C. Liu, K. Sundaresan, M. Jiang, S. Rangarajan, G.K. Chang, IEEE  International Conference on Computer Communications (INFOCOM), Apr 2013.
  • "A Resource Management System for Interference Mitigation in Enterprise OFDMA Femtocells", M. Arslan, J. Yoon, K. Sundaresan, S. Rangarajan, S. Krishnamurthy, in IEEE/ACM Transactions on Networking, 2013.
  • "Design and Implementation of an Integrated Beamformer and Uplink Scheduler for OFDMA Femtocells." M. Arslan, K. Sundaresan, S. Krishnamurthy, S. Rangarajan, ACM MOBIHOC 2012.
  • "A Distributed Resource Management Framework for Interference Mitigation in OFDMA Femtocell Networks."J. Yoon, M. Arslan, K. Sundaresan, S. Krishnamurthy, S. Banerjee, ACM MOBIHOC 2012.
  • "Characterization of Interference in OFDMA Femtocell Networks." M. Arslan, J. Yoon, K. Sundaresan, S. Krishnamurthy, S. Banerjee, IEEE INFOCOM Mini-Conf 2012.
  • "FERMI: A Femtocell Resource Management System for Interference Mitigation in OFDMA Networks." M. Arslan, J. Yoon, K. Sundaresan, S. Krishnamurthy and S. Banerjee, ACM MOBICOM, Sept 2011.
  • "Efficient Resource Management in OFDMA Femto Cells.", K. Sundaresan and S. Rangarajan, ACM MOBIHOC, May 2009.

Advanced Spectrum and QoS Management: Several new features such as shared/unlicensed spectrum access, carrier aggregation, device-device communication, 3D beamforming, etc. are being introduced as part of next generation mobile cellular networks. We explore and understand what these technologies mean for the network as such and design efficient solutions to realize their potential.

  • “LTE in Un-licensed Spectrum: Are We There Yet?”, E. Chai, K. Sundaresan, M. Khojastepour, S. Rangarajan, Proceedings of ACM International Conference on Mobile Computing and Networking (MOBICOM), Oct 2016.
  • “The Economics of Quality-Sponsored Data in Wireless Networks”, M. Lotfi, K. Sundaresan, M. Khojastepour, S. Rangarajan, International Symposium on Modeling and Optimization in Mobile, Ad-hoc and Wireless Networks (WiOPT), May 2015.
  • "A Practical Traffic Management System for Integrated LTE-WiFi Networks", R. Mahindra, H. Viswanathan, K. Sundaresan, M. Arslan, S. Rangarajan, Proceedings of ACM International Conference on Mobile Computing and Networking (MOBICOM), Sept 2014.
  • "R2D2: Embracing Device-Device Communication in Next Generation Cellular Networks", T. Bansal, K. Sundaresan, P. Sinha, S. Rangarajan, IEEE INFOCOM 2014.
  • "Energy-Efficient Carrier Aggregation Algorithms for Next Generation Cellular Networks", K. Sundaresan, S. Rangarajan, IEEE INCP 2013.

Relays: Next generation standards are interested in two-hop relay networks for increasing both the coverage and capacity of mobile networks. Resource management solutions developed for conventional one-hop mobile cellular networks do not directly apply to these relay networks. In this regard, we have developed several movel resource management solutions addressing various aspects relating to OFDMA and data traffic.
  • "Cooperation vs. Multiplexing: Multicast Scheduling Algorithms for OFDMA Relay Networks", K. Sundaresan, S. Rangarajan, in IEEE/ACM Transactions on Networking, 2013.
  • "Adaptive Resource Scheduling in Wireless OFDMA Relay Networks." K. Sundaresan and S. Rangarajan, To appear IEEE INFOCOM 2012.
  • "Cooperation vs. Multiplexing: Multicast Scheduling Algorithms for OFDMA Relay Networks." K. Sundaresan and S. Rangarajan, Proceedings of ACM International Conference on Mobile Ad Hoc Networking and Computing (MOBIHOC), Chicago, Sept 2010.
  • "Efficient Algorithms for Leveraging Spatial Reuse in OFDMA Relay Networks." K. Sundaresan, and S. Rangarajan, Proceedings of IEEE International Conference on Computer Communications (INFOCOM), Rio De Janeiro, Brazil, April 2009.
  • "On Exploiting Diversity and Spatial Reuse in Relay-enabled Wireless Networks." K. Sundaresan and S. Rangarajan, Best Paper Award, Proceedings of ACM International Symposium on Mobile Ad Hoc Networking and Computing (MOBIHOC), Hong Kong, May 2008

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