Associate Professor

Dpt. of Electrical and Computer Engineering
University of California, Santa Barbara, CA 93106

email   vrodoplu-at-ece-dot-ucsb-dot-edu

   Current Projects:

    * National Science Foundation (NSF) Grant:

"NeTS: Automated Design of Medium Access Control Protocols "

The main aim of the project is to automate the design of medium access control (MAC) protocols, which will shed light on the automated design of network protocols in general. See our publications on automated protocol design in the Publications section.

    * National Science Foundation (NSF) CAREER Award:

"QoS Maps for Large-Scale, High-Mobility Wireless Networks"

: The traditional schemes that focus on mobility at the node scale cannot deliver quality of service (QoS) for highly mobile networks. By focusing on end-to-end QoS metrics and treating mobility in the aggregate, we show how to deliver QoS even in highly mobile networks. This opens the way to the large-scale deployment of civilian mobile networks.

    (Click here for full publication list.)

1. "Challenges: Automated Design of Networking Protocols"
Volkan Rodoplu and Amir Aminzadeh Gohari
in Proc. ACM Mobicom 2008, San Francisco, Sep. 2008.
(Acceptance Rate: 12%)

Impact: This paper describes a new paradigm for the automated generation of networking protocols. Currently, networking protocols are hand-designed, leading to long protocol design cycles. Automating network protocol generation would produce a revolution in networking, as silicon compilers did for electronic design 20 years ago. This paper proposes a general framework as to how to achieve this.

2. "Towards Automated Design of MAC Protocols for Underwater Wireless Networks"
Volkan Rodoplu, Amir Aminzadeh Gohari, Wei Tang
in Proc. ACM Workshop on Underwater Networks (WUWNET 2008), Sep. 2008.

Impact: This paper demonstrates the first application of the automated protocol generation paradigm, in the context of generating MAC protocols for underwater networks, which has been a particularly hot field in the last three years.

3. "Energy Maps for Mobile Wireless Networks: Coherence Time versus Spreading Period"

Min Kyoung Park and Volkan Rodoplu
accepted by IEEE Transactions on Mobile Computing, Jan. 2009.

Impact: We define two fundamental concepts for trackability of QoS metrics in highly mobile networks: The coherence time is the maximum duration for which the QoS metric remains roughly constant. The spreading period is the minimum duration required to spread the QoS information to all the nodes. If the coherence time is greater than the spreading period, we have a mobile network whose QoS can be tracked. This paper establishes both the conditions and the methodology for end-to-end QoS delivery in highly mobile networks, focusing on the energy metric.

4. "UWAN-MAC: An Energy-Efficient MAC Protocol for Underwater Acoustic Wireless Sensor Networks"
Min Kyoung Park and Volkan Rodoplu
IEEE J. Oceanic Engineering, vol. 32, no. 3, pp. 710-720, Jul. 2007.

Impact: This highly cited paper (including its conference version) is the first detailed MAC protocol designed specifically for underwater sensor networks that operate over acoustic links. The paper solves the synchronization problem in the presence of long propagation delays underwater, without requiring any handshakes to estimate the link propagation delays. It also solves problems of loss of synchronization and handles newcomers into the network. It leads to a high battery lifetime for nodes to operate underwater for long periods. (Underwater networking is an exciting new area, and the ACM WUWNET workshop has had the highest attendance among all ACM Mobicom workshops in the last 2 years. This growth is fueled by multiple sources: (1) Growing emphasis on ecology and environment, and ORION ocean observatories, (2) Growing emphasis on Navy surveillance applications by underwater sensors, (3) Underwater seismic oil exploration in response to high demand for oil. All of these drive the need for underwater networking solutions.)

5. "Multiple-Leader Stackelberg Network Price Equilibria: Computation and Protocol Design"
Volkan Rodoplu and Gautam S. Raj
under review by IEEE Transactions on Mobile Computing, 2008.

Impact: This paper leads the implementation of network protocols for ad hoc networks in which the relay nodes (the routers) can form a model of the source node's behavior, and make pricing decisions accordingly as Stackelberg leaders. The paper proposes, for the first time, multiple-leader Stackelberg network games, where each relay node is a Stackelberg leader. (Previous works in the literature had only a single leader, which was an ISP in a wired setting.) The paper shows how to combine sophisticated mathematical pricing models, with detailed, real-world protocol design involving careful design of control packet structures, and distributed protocols which must have low complexity as well as access to only local network information. The expected long-term impact of the paper is to form a bridge between the analytical researchers (who are proving theorems on network pricing) and the protocol designers (who search for simplicity, portability, and scalability).