Brief Overview of Selective Research Areas and Breakthrough Developments


  1. Stochastic Modeling and Detection of Stochastic Point and Jump Processes.
    Development of fundamental stochastic models and likelihood ratios for the detection and processing of information processes that are modeled as stochastic point and jump processes.

  2. Information Rates and Data Compression for Poisson Sequences and Processes
    Derivation of the Rate-Distortion functions for Poisson sequences and processes, identifying the performance of the ‘best’ compression mechanism for information streams that are modeled as such stochastic processes.

  3. Basic Queueing Delay Analysis for Communications Network Systems
    Breakthrough development of methods for the modeling and calculation of packet and message queueing delay distributions in packet-switching networks.

  4. Delay Capacity Product for packet-Switching Computer Communications Networks
    Development of conservation and separation principles for the synthesis of packet switching networks relating to the network’s product of overall capacity and message delay performance.

  5. Synthesis of Reliable Topologies for Communications Networks
    Synthesis of optimal network topologies under diameter (delay), total link (capacity) and connectivity constrains.

  6. ARQ Error-control for TDMA Multiple Access Communications Channels
    Analysis and design of stop-and-wait, Go-Back-N (window based) and Selective-Repeat ARQ schemes.

  7. Modeling, Analysis and Design of Medium Access Control (MAC) Protocols and Algorithms for Multiple Access Communications Channels
    Extensive on-going developments of new architectures, algorithms and protocols to control the operation of a multiple access communications channels and network.  Classes of algorithms include: fixed assigned (TDMA, FDMA, CDMA, SDMA); demand assigned: polling and reservation based; random access: pure and dynamic group random access, CSMA and CSMA/CA based, and many others; Hybrid protocols.

  8. Modeling and Analysis of Communications Network Systems when subjected to Fluctuating Traffic Processes and to Traffic Characterized by Long Range Dependence
    Analysis of queueing systems under bursty traffic conditions; modeling of LRD traffic by Multi-Fractal processes; performance behavior and design of communications network systems when subjected to traffic that is modeled by the latter processes.

  9. Integrated Data/Voice and Multimedia Multiplexers and Multiple Access Networks
    Mechanisms and analytical modeling and evaluation methods for multiplexing and multiple access systems that are shared by data, voice and video processes  as well as by other multimedia traffic flows. 

  10. Network Management and Integrated System Management
    Fundamental concepts, models and architectures involving monitoring and control management operations in communications networks.  Tradeoffs involving monitoring precision, capacity utilization and control responsiveness and efficacy.  Integrated system management for ad hoc wireless network systems that involve combined resource allocations for communications and sensor subsystems.

  11. Input-Rate Flow Control for Communications Networks and QoS based operations.  Modeling and Analysis of ATM switching Systems and Networks
    Analysis and design of input-rate flow control mechanism under desired user-perceived performance measures.  ATM switching systems.

  12. Modeling, Analysis and Design of Cellular Wireless Network Systems
    Analysis and design of networking protocols and algorithms for cellular wireless networks, including multiple access mechanisms, handoff methods, optimal selection of the Location Update zones; forward and reverse signaling channels.

  13. Analysis and Design of Load Adaptive Networking Protocols and Algorithms for Wideband Packet Satellite Networks
    Load adaptive TDMA procedures and algorithms for efficient operation of packet based satellite networks.  Development of the theory of capacity varying networks and its application to the analysis and design of low altitude satellite networks (including best paper award).

  14. Analysis and Design of Local Area Networks
    Modeling and analysis of random access, token ring, FDDI and other local area networks.

  15. Combined Information Theory and Network Theory based models and Congestion Adaptive Compression Processing Ideally Characterized by the Delay-Distortion Function
    Development of approaches for the design of communications network systems integrating and combining the use of information theory to characterize the error-rate vs. information rate behavior, and incorporating queueing theory to exhibit the system’s delay-throughput behavior.  Definition and characterization of the Delay-Distortion function that described the ideally best combined compression (via a distortion measure) and congestion (via a packet delay measure) operation.  Congestion state adaptive voice and video compression algorithms.

  16. All-Optical Networking
    Development of fundamental concepts and architectures for all optical circuit and packet switched operations across network systems, including ring and meshed ring network systems.  Development of the concept of shuttle networking for all-optical operation across such network systems.   Synthesis of all-optical ring and meshed ring networks.

  17. MPLS-Plus networking
    Concepts for networking operations that require reduced processing at the routers and switches.  

  18. Ad Hoc Wireless Networking using Mobile Backbones:  Mobile Backbone Networks (MBNs)
    New mechanisms for ad hoc wireless networking based on the dynamic formation of mobile backbones.  On-going innovative developments include:  topology synthesis algorithms for the backbone networks; robust routing; on-demand MBN based routing using flow control schemes to provide for guaranteed QoS support; hybrid backbone and non-backbone operation.  Cross MAC/network layer operations. 

  19. Unmanned Vehicle Aided Multi-tier Ad Hoc Wireless Networks
    Use of unmanned ground vehicles (UGVs) and unmanned airborne vehicles (UAVs) to best support the operation of MBN based ad hoc wireless networks.  UAV swarm networks.  Development of new measures for characterizing the desired performance of user streams and flows when served by mobile ad hoc wireless networks.  Use of the new measures to control and guide the placement of UGVs and UAVs to best support client message flows and streams.  

  20. Power-control Spatial-Reuse Scheduling and combined Routing/Scheduling MAC Algorithms for Multiple Access Channels and Ad Hoc Wireless Networks
    Development of fundamental results of key theoretical and practical importance for the derivation of MAC schedules (channel resource allocations) and transmit power assignments based on realistic SINR based interference models.  Substantial throughput upgrade of current scheduling oriented (such as TDMA and CDMA based) MAC operations.  Proofs that higher power operations, and not lower transmit power ones, can yield substantial performance improvement.  New partial coloring oriented scheduling algorithms.  Centralized and distributed network operations.  

  21. Power-control Spatial-Reuse CSMA based MAC Algorithms for Multiple Access Channels and for Multi-Hop Ad Hoc Wireless Networks
    Development of  algorithms for the joint MAC scheduling and selection of transmit power levels in a IEEE 802.11 CSMA/CA type MAC system based on monitored channel congestion state.  Significant improvement of throughput and fairness oriented behavior.  

  22. Use of UAV Swarms for Enhanced Search Operations
    Synthesis and performance evaluation of area search layouts for UAV swarm teams.  Comparisons with random search operations.