Papers by William Ivancic
IETF has proposed Mobile IPv6-based Network Mobility (NEMO) basic support protocol (BSP) to suppo... more IETF has proposed Mobile IPv6-based Network Mobility (NEMO) basic support protocol (BSP) to support net-work mobility. NEMO BSP inherits all the drawbacks of Mobile IPv6, such as inefcient routing path, single point of failure, high handover latency and packet loss, and high packet overhead. To address these drawbacks, we proposed an IP diversity-based network mobility management scheme called Seamless IP-diversity based NEtwork MObility (SINEMO). In this paper, we develop an analytical model to analyze and compare the signalling costs of SINEMO and and NEMO BSP. Our analysis shows that SINEMO reduces the signalling cost by a factor of two when compared to NEMO BSP. I.
J. Wirel. Mob. Networks Ubiquitous Comput. Dependable Appl., 2011
Network Mobility (NEMO) has been proposed to efficiently manage the mobility of the group of host... more Network Mobility (NEMO) has been proposed to efficiently manage the mobility of the group of hosts that are moving together as a mobile network. NEMO Basic Support Protocol (BSP) suffers from the problem of inefficient route. A number of route optimization schemes have been proposed in the literature to solve the problem. The schemes are mainly based on four approaches – Delegationbased, Hierarchical, Source routing and BGP-assisted. The approaches have been evaluated in the literature in terms of various performance metrics. The selection of a route optimization approach for NEMO in terrestrial networks is straight forward from the evaluations that implicitly assume NEMO in such networks. However, the selection of a route optimization approach requires additional evaluations for NEMO architecture that has been proposed for satellite networks to manage the mobility of Internet Protocol-enabled devices onboard satellites. The requirement for the additional evaluations results from th...
Journal of Aerospace Computing, Information, and Communication, 2006
Aeronautical Telecommunication Network (ATN) has been developed by International Civil Aviation O... more Aeronautical Telecommunication Network (ATN) has been developed by International Civil Aviation Organization (ICAO) to integrate air-ground and ground-ground data communications for aeronautical applications into a single network serving air traffic control and aeronautical operational communications. The current ICAO ATN model specifies a standalone network with its own protocols, which requires building an expensive separate network for air-ground and ground-ground communications. However, the cost of building ATN can be reduced if it can use existing networks wherever possible, such as the Internet. ARINC 664 Part 8 committee has been developing an approach for inter-operation of ATN applications over the commercial TCP/IP networks. To carry time critical information required for aeronautical applications, ATN provides different Quality of Services (QoS) to applications. Although the current Internet does not provide QoS, Internet Engineering Task Force (IETF) developed the Differentiated Services (DiffServ) network to provide differential QoS to users of next generation data networks. The objective of this paper is to investigate the possibility and conduct a proof-of-concept evaluation of providing QoS to ATN applications over the DiffServ network in the next generation Internet. Our results show that the QoS requirements of ATN applications for ground-to-ground communications can be successfully satisfied when ATN is run over a DiffServ backbone.
2002 14th International Conference on Ion Implantation Technology Proceedings (IEEE Cat. No.02EX505)
This paper describes a network demonstration and three month field trial of mobile networking usi... more This paper describes a network demonstration and three month field trial of mobile networking using mobile-IPv4. The network was implemented as part of the US Coast Guard operational network which is a ".mil" network and requires stringent levels of security. The initial demonstrations took place in November 2002 and a three month field trial took place from July through September of 2003. The mobile network utilized encryptors capable of NSA-approved Type 1 algorithms, mobile router from Cisco Systems and 802.11 and satellite wireless links. This paper also describes a conceptual architecture for wide-scale deployment of secure mobile networking in operational environments where both private and public infrastructure is used. Additional issues presented include link costs, placement of encryptors and running routing protocols over layer-3 encryption devices.
15th International Communicatons Satellite Systems Conference and Exhibit, 1994
This paper deals with two different ways to adapt a multibeam satellite payload capacity in terms... more This paper deals with two different ways to adapt a multibeam satellite payload capacity in terms of satellite antenna gain and frequency bandwidth according to traffic pattern variations. One proposed solution consists in using a channel to beam switching device which allocates channels to beams. The other one consists in using a reconfigurable active antenna which can change the shape of each radiated beam. The two solutions are compared in terms of service quality : call blocking probability and mean waiting time for a new incoming station in the network. It is shown that, for a satellite payload using high gain beams and a frequency-reuse scheme, the second solution is the most efficient one in the case of heavy traffic loads.
18th International Communications Satellite Systems Conference and Exhibit, 2000
NASA Glenn Research Center has been working with industry, academia, and other government agencie... more NASA Glenn Research Center has been working with industry, academia, and other government agencies in assessing commercial communications protocols for satellite and space-based applications. In addition, NASA Glenn has been developing and advocating new satellite friendly modifications to existing communications protocol standards. This paper summarizes recent research into the 14. SUBJECT TERMS Protocol; Satellite; Communication 17. SECURITY CLASSIFICATION OF REPORT Unclassified
2010 - MILCOM 2010 MILITARY COMMUNICATIONS CONFERENCE, 2010
IETF proposed Hierarchical Mobile IPv6 (HMIPv6) to support host mobility and mobility management ... more IETF proposed Hierarchical Mobile IPv6 (HMIPv6) to support host mobility and mobility management involves signaling costs at various mobility entities of the network. Widespread use of IP-enabled mobile devices have resulted in increase in number of mobile users and the signaling cost on underlying mobility entities have increased significantly, which will result in their performance degradation. However, there has been no comprehensive cost analysis of mobility protocol entities that considers all possible costs. In this paper, we have developed analytical models to estimate total costs of key mobility management entities of HMIPv6. We have presented numerical results to demonstrate the impact of network size, mobility rate, traffic rate and data volume on these costs and the percentage overhead on the mobility entities. Our results show that a significant amount of resources are required by the mobility entities for transmission, processing of various signaling messages, as well as searching location database. Our cost analysis will thus be helpful for military applications in estimating actual resource requirements for on-board IP-enabled devices in military vans, tanks, helicopters that require mobility management especially while in operation.
2010 International Conference on High Performance Switching and Routing, 2010
To facilitate mobile computing, mobility protocols have been proposed and mobility management inv... more To facilitate mobile computing, mobility protocols have been proposed and mobility management involves signaling costs. Widespread use of IP-enabled mobile devices have resulted in increase in number of mobile users in the network and the signaling cost on underlying mobility entities have increased significantly, which will result in performance degradation of the mobility protocols. However, there has been no comprehensive cost analysis of mobility protocol entities that considers all possible costs for mobility management. In this paper, we have developed analytical models to estimate total costs of mobility management entities of SIGMA, an IP-diversity based seamless handover protocol. We have presented numerical results to demonstrate the impact of increased of network size, mobility rate, traffic rate and data volume on these costs. Our results show that a significant amount of resources are required by the mobility entities for transmission, processing of various signaling messages, as well as searching location database. Our cost analysis will thus help network engineers estimate actual resource requirements of the network in future design.
Proceedings of first ACM/IEEE international workshop on Mobility in the evolving internet architecture, 2006
IETF has proposed Mobile IPv6-based Network Mobility (NEMO) basic support protocol (BSP) to suppo... more IETF has proposed Mobile IPv6-based Network Mobility (NEMO) basic support protocol (BSP) to support network mobility. NEMO BSP inherits all the drawbacks of Mobile IPv6, such as inefficient routing path, single point of failure, high handover latency and packet loss, and high packet overhead. To address these drawbacks, we proposed an IP diversitybased network mobility management scheme called Seamless IPdiversity based NEtwork MObility (SINEMO). In this paper, we develop an analytical model to analyze and compare the signalling costs of SINEMO and and NEMO BSP. Our analysis shows that SINEMO reduces the signalling cost by a factor of two when compared to NEMO BSP.
IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference, 2008
IETF has proposed Mobile IPv6-based Network Mobility (NEMO) basic support protocol (BSP) to suppo... more IETF has proposed Mobile IPv6-based Network Mobility (NEMO) basic support protocol (BSP) to support network mobility. NEMO BSP inherits all the drawbacks of Mobile IPv6, such as inefficient routing path, single point of failure, high handover latency and high packet overhead. To address these drawbacks, a new network mobility scheme, called Seamless IP-diversity based Network Mobility (SINEMO), has been proposed. The goal of this paper is to validate with experimental data that SINEMO performs better than NEMO BSP. We show that SINEMO can improve the performance of IP based mobile networks.
MILCOM 2008 - 2008 IEEE Military Communications Conference, 2008
The Stream Control Transmission Protocol (SCTP) is an IETF-standard transport layer protocol in t... more The Stream Control Transmission Protocol (SCTP) is an IETF-standard transport layer protocol in the IP protocol suite. SCTP is very attractive for data communication over satellite networks due to its unique features such as multihoming and multistreaming that are not present in TCP. SIGMA, an SCTP-based mobility management scheme, has been developed for space networks. RTEMS, an open source Real Time Operating System (RTOS), is used by the computers onboard several spacecraft. The network stack of RTEMS does not include SCTP. The objective of this paper is to describe the issues and challenges in implementing SCTP on the RTEMS operating system. The lessons learned will be helpful to implement SCTP in other operating systems.
2010 International Conference on High Performance Switching and Routing, 2010
A number of prefix delegation-based schemes have been proposed to solve the route optimization pr... more A number of prefix delegation-based schemes have been proposed to solve the route optimization problem in NEMO, where a group of hosts move together as a mobile network. The schemes trade off between inefficiency of routes and various overheads. With the rapid growth of mobile computing, this overhead will give rise to the scalability issue of these schemes. However, there has been no quantitative study on the asymptotic scalability analysis of these schemes. In this paper, we have developed analytical models for scalability analysis of these schemes in terms of network size, mobility rate, distance between mobility agents, and traffic rate. Our analysis shows that the prefix delegation-based schemes exhibit asymptotically identical overhead on the network, and they show better asymptotical scalability in terms of number of mobile routers. The analytical framework for scalability analysis presented in this paper will help in visualizing the effects of future network expansion on the performance of these route optimization schemes of NEMO.
MILCOM 2008 - 2008 IEEE Military Communications Conference, 2008
NEtwork MObility (NEMO) protocols can be used to manage aggregate mobility of multiple IP-enabled... more NEtwork MObility (NEMO) protocols can be used to manage aggregate mobility of multiple IP-enabled devices onboard a Low Earth Orbit satellite (a mobile network on-board). NEMO protocols enjoy several performance advantages, such as reduced signaling, increased manageability and conservation of satellite link bandwidth as compared to host mobility protocols for individual devices. In addition, NEMO protocols can provide continuous connectivity at upper layers using nested NEMO (a mobile network attached to another) during unavailability of ground stations where as connection would terminate if host mobility protocols were used. Therefore, NEMO protocols needs to be evaluated in space. We propose an architecture for NEMO in space, where the devices are connected together using an onboard Local Area Network. The architecture includes nesting where a mobile network on-board a satellite can attach to another. We evaluated NEMO protocols for the architecture using a space friendly data transfer protocol called Saratoga because widely used protocols like TCP is not space friendly. Simulation based performance evaluation shows continuity of connections at upper layers and performance superiority of Saratoga to TCP for NEMO in space.
Quality of Service over Next-Generation Data Networks, 2001
Aeronautical Telecommunication Network (ATN) has been developed by the International Civil Aviati... more Aeronautical Telecommunication Network (ATN) has been developed by the International Civil Aviation Organization to integrate Air-Ground and Ground-Ground data communication for aeronautical applications into a single network serving Air Traffic Control and Aeronautical Operational Communications [1]. To carry time critical information required for aeronautical applications, ATN provides different Quality of Services (QoS) to applications. ATN has therefore, been designed as a standalone network which implies building an expensive separate network for ATN. However, the cost of operating ATN can be reduced if it can be run over a public network such as tile Internet. Although the current Internet does not provide QoS, the next generation Internet is expected to provide QoS to applications. The objective of this paper is to investigate the possibility of providing QoS to ATN applications when it is run over the next generation Internet. Differentiated Services (DiffServ), one of the protocols proposed for the next generation Internet, will allow network service providers to offer different QoS to customers. Our results show that it is possible to provide QoS to ATN applications when they run over a DiffServ backbone.
Proceedings. 12th International Conference on Computer Communications and Networks (IEEE Cat. No.03EX712)
In this paper, we study the impact of multistreaming on the performance of SCTP over satellite ne... more In this paper, we study the impact of multistreaming on the performance of SCTP over satellite networks. We first show that multistreaming results in higher goodput than single streams when the receiver buffer is constrained as in the case of wireless handheld devices. We then demonstrate that the multistreaming feature of SCTP results in reduced buffer requirements at the receiver in the presence of losses in the satellite network. The above advantages makes SCTP an attractive transport protocol for wireless handheld devices.
IEEE Globecom 2006, 2006
IETF has developed Mobile IP to support mobility of IP hosts at the network layer. The National A... more IETF has developed Mobile IP to support mobility of IP hosts at the network layer. The National Aeronautics and Space Administration has implemented Mobile IP to handle handovers in space networks. Due to a number of limitations of Mobile IP, such as high handover latency, packet loss rate, and conflict with existing network security solutions, a new IPdiversity based mobility management scheme, called SIGMA, has been developed through collaborative efforts of NASA and University of Oklahoma. In this paper, we illustrate the performance of SIGMA for managing handovers in space networks. We show by simulation that SIGMA extends network connectivity from space to ground, and ensures smooth handover between spacecrafts for different space network scenarios.
VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference, 2005.
Mobile IP, an industry standard for handling mobility, suffers from high handover latency and pac... more Mobile IP, an industry standard for handling mobility, suffers from high handover latency and packet loss, in addition to change in network infrastructure. To overcome these problems, we proposed a novel approach called Seamless IP diversity based Generalized Mobility Architecture (SIGMA). Although SIGMA achieved a low latency handoff, use of IP diversity resulted in some instability during handoff. In this paper, we propose a new handoff policy, called HANSIG-HR, to solve the instability problem of SIGMA. HANSIG-HR is based on Signal to Noise Ratio (SNR), hysteresis and route cache flushing. Our experimental results show that HANSIG-HR improves the stability of SIGMA.
VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference, 2005.
Mobile IP, an industry standard for handling mobility, suffers from high handover latency and pac... more Mobile IP, an industry standard for handling mobility, suffers from high handover latency and packet loss, in addition to change in network infrastructure. To overcome these problems, we proposed a novel approach called Seamless IP diversity based Generalized Mobility Architecture (SIGMA). Although SIGMA achieved a low latency handoff, use of IP diversity resulted in some instability during handoff. In this paper, we propose a new handoff policy, called HANSIG-HR, to solve the instability problem of SIGMA. HANSIG-HR is based on Signal to Noise Ratio (SNR), hysteresis and route cache flushing. Our experimental results show that HANSIG-HR improves the stability of SIGMA.
Millenium modem/channelizer special test equipment
16th International Communications Satellite Systems Conference, 1996
A broadband modem/channelizer test set developed by NASA Lewis Research Center is discussed. The ... more A broadband modem/channelizer test set developed by NASA Lewis Research Center is discussed. The test set is a fully programmable, bit-error-rate (BER) test set designed for broadband modem-only and multichannel demultiplexer/demodulator characterization. It is currently configured for testing a multichannel demultiplexer/demodulator and was developed for the Advanced Research and Projects Agency under a Technology Reinvestment Program Cooperative Agreement entitled 'Millennium: 21st Century Broadband Digital Telecommunications Technology.' The test set can easily be modified to provide testing of other modems and multichannel demultiplexer/demodulator systems and is available to industry for such testing.
Eifel has been proposed as a solution to enhance the performance of TCP during delay spikes in a ... more Eifel has been proposed as a solution to enhance the performance of TCP during delay spikes in a wireless mobile environment. This paper evaluates and compares the performance of SCTP, TCP, and Eifel during delay spikes. We have shown that although Eifel performs better than TCP Reno and SCTP when there are no packet losses, the opposite is true when packets are lost in the presence of delay spikes. Our results also show that a higher link bandwidth does not always increase the data throughput of SCTP, TCP Reno, and Eifel.
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Papers by William Ivancic