Mukul Goyal

Mukul Goyal
University of Wisconsin–Milwaukee | UWM · Department of Computer Science

About

64
Publications
23,149
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1,028
Citations
Introduction
Skills and Expertise
Additional affiliations
September 2004 - present
University of Wisconsin–Milwaukee
Position
  • Professor (Associate)

Publications

Publications (64)
Article
Full-text available
To meet an increasing demand for multimedia services and electronic connectivity across the world, satellite networks will play an indispensable role in the deployment of global networks. The new services gaining momentum include mobile services, private intranets and high data rate internet access carried over integrated satellite-fiber networks....
Preprint
To meet an increasing demand for multimedia services and electronic connectivity across the world, satellite networks will play an indispensable role in the deployment of global networks. The new services gaining momentum include mobile services, private intranets and high data rate internet access carried over integrated satellite-fiber networks....
Article
The pure form of log-optimal investment strategies are often considered to be impractical due to the inherent need for continuous rebalancing. It is however possible to improve investor log utility by adopting a discrete-time periodic rebalancing strategy. Under the assumptions of geometric Brownian motion for assets and approximate log-normality f...
Article
Full-text available
We study the question of how often an investment portfolio be rebalanced to achieve the goal of maximizing the investor utility for any given investment horizon. We choose to use the log-optimal strategy that is appropriate when investors adhere to a logarithm utility function. This form of active investment strategy is cost-prohibitive and even im...
Article
Full-text available
Open Shortest Path First (OSPF), a link state routing protocol, is a popular interior gateway protocol (IGP) in the Internet. Wide spread deployment and years of experience running the protocol have motivated continuous improvements in its operation as the nature and demands of the routing infrastructures have changed. Modern routing domains need t...
Conference Paper
We determine an opportune time to rebalance a two-asset portfolio set up using the single period Markowitz framework. This is achieved by studying and comparing the nature of portfolio evolution when two extreme rebalancing strategies are used, viz. passive or buy-and-hold and active or continuous rebalancing. We compute the rebalance time as the p...
Conference Paper
Portfolio rebalancing decisions are crucial to today's portfolio managers especially in high frequency trading environment. These decisions must be made fast in dynamic market conditions. We analyze the efficiency and scalability of a proposed discrete-time rebalancing algorithm suitable for log-optimal investors. These investors seek to maximize t...
Article
Full-text available
An important part of the foreseen Internet of Things consists in wireless sensor networks running adapted IPv6 protocols. Since the way sensors are scattered is generally unplanned and may evolve with time, a routing protocol is needed in order to provide paths across such networks. Efforts towards standardizing RPL, a routing protocol tar-geting s...
Article
Full-text available
IEEE 802.15.4 is a popular choice for MAC/PHY protocols in low power and low data rate wireless sensor networks. In this paper, we suggest several modifications to beaconless IEEE 802.15.4 MAC operation and evaluate their impact on the performance via stochastic modeling and simulations. We found that the utility of these modifications is strongly...
Article
IEEE 802.15.4 is a popular choice for MAC/PHY protocols in low power and low data rate wireless sensor networks. In this paper, we suggest several modifications to beaconless IEEE 802.15.4 MAC operation and evaluate their impact on the performance via stochastic modeling and simulations. We found that the utility of these modifications is strongly...
Conference Paper
Large scale wireless sensor networks, consisting of thousands of nodes spread over a large geographical area, are being planned for a number of monitoring and control applications. The individual nodes in such networks would be severely limited in their capabilities - they will have limited memory and CPU resources and would typically run on batter...
Article
Full-text available
The ROLL working group at IETF is currently designing RPL, the Routing Protocol for Low power and lossy networks. RPL is based on organizing the nodes in a network in one or more directed acyclic graphs(DAGs) rooted at the popular/default destinations. The DAG structure naturally supports multipoint-to-point routing towards the DAG root and point-t...
Conference Paper
Full-text available
In this paper, we evaluate the impact of signal to noise ratio (SNR) on the PHY-level packet loss rates on IEEE 802.15.4 links under the additive white Gaussian noise and Rayleigh fading models. We show that IEEE 802.15.4 PHY-level packet loss rate has a step-like response to the SNR deterioration. In other words, the packet loss rate is largely un...
Article
Full-text available
Directed Acyclic Graphs (DAGs), rooted at popular/default destinations, have emerged as a preferred mechanism to provide IPv6 routing functionality in large scale low power and lossy networks, that include wireless sensor networks and those based on power line communication. A DAG maintains its acyclic nature by requiring that each DAG node must ha...
Conference Paper
IEEE 802.15.4, a MAC/PHY protocol for low power and low data rate wireless networks, is emerging as the popular choice for various monitoring and control applications. Depending on the application, the traffic load on an IEEE 802.15.4 network may vary over a wide range. The performance of the protocol, measured in terms of the packet loss probabili...
Conference Paper
In this paper, we describe our modifications to ospfd, a popular open-source implementation of OSPF routing protocol. The ospfd software can also be run in simulation mode, where processes, representing individual routers, communicate with each other over UDP sockets. Even though ospfd provides a fine-granularity implementation of OSPF protocol, it...
Conference Paper
IEEE 802.15.4 is a popular choice for MAC/PHY protocols in low power and low data rate wireless sensor networks. In this paper, we develop a stochastic model for the beaconless operation of IEEE 802.15.4 MAC protocol. Given the number of nodes competing for channel access and their packet generation rates, the model predicts the packet loss probabi...
Article
IEEE 802.15.4, a MAC/PHY protocol for low power and low data rate wireless networks, is emerging as the popular choice for various monitoring and control applications. Depending on the application, the traffic load on an IEEE 802.15.4 network may vary over a wide range. Hence, proper configuration is important for successful operation of the protoc...
Conference Paper
Wireless communication among sensor devices, enabled by IEEE 802.15.4 protocol, is increasingly replacing the existing wired technology in a wide range of monitoring and control applications. IEEE 802.15.4 networks typically operate in 2.4 GHz ISM band, which is used by popular IEEE 802.11 (WiFi) networks as well. An overlap between the channels us...
Article
Full-text available
IEEE 802.15.4, a MAC/PHY protocol for low power and low data rate wireless networks, is emerging as the popular choice for various monitoring and control applications. Depending on the application, the traffic load on an IEEE 802.15.4 network may vary over a wide range. The performance of the protocol, measured in terms of the packet loss probabili...
Conference Paper
OSPF is a popular interior gateway routing protocol. Commercial OSPF routers limit their processing load by using a hold time between successive routing table calculations as new link state advertisements (LSAs) arrive following a topology change. A large hold time value limits the frequency of routing table calculations but also causes large delay...
Article
IEEE 802.15.4, a MAC/PHY protocol for low power and low data rate wireless networks, is emerging as the popular choice for various monitoring and control applications. Depending on the application, the traffic load on an IEEE 802.15.4 network may vary over a wide range. The performance of the protocol, measured in terms of the packet loss probabili...
Conference Paper
Fast convergence to topology changes is now a key requirement in routing infrastructures while reducing the routing protocol’s processing overhead continues to be as important as before. In this paper, we examine the problem of scheduling routing table updates in link state routing protocols. Commercial routers typically use a hold time based schem...
Article
In this article, the authors propose modifications to OSPF's interface state machine to reduce the time/processing requirements of the leader election process in a broadcast local-area network (LAN) environment. The proposed modifications are based on dynamic adjustment of wait time duration rather than using a static value. They compare the origin...
Conference Paper
In this paper, we analyze OSPF's interface state machine and propose modifications in order to reduce the time/processing requirements of the leader election process in a broadcast LAN environment. The proposed modifications are based on dynamic adjustment of wait time duration rather than using a static value.
Article
Full-text available
A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constellations operating in the Ka-band and above. The next generation broadband satellite systems will use fast packet switching with onboard processing to provide full two-way services to and fro...
Article
Full-text available
Congestion remains the main obstacle to the Quality of Service on the Internet. We believe that a good solution to Internet congestion should optimally combine congestion signaling from network and source reaction, having as main goals: minimum losses and delays, maximum network utilization, fairness among flows and last but not least scalability o...
Article
Full-text available
Exponential growth of Internet traffic and the proliferation of new user applications warrant the development of new Internet infrastructure. Due to the fundamental satellite system characteristics such as global coverage, broadcast nature, and bandwidth on demand, satellite systems are excellent candidates for providing high data rate Internet acc...
Article
Full-text available
To meet an increasing demand for multimedia services and electronic connectivity across the world, satellite networks will play an indispensable role in the deployment of global networks. A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constella...
Article
Full-text available
This contribution presents the simulation results on the performance of TCP enhancements over ATM-UBR+ for satellite latencies with limited switch buffers for WWW traffic. We analyze the impact of Fast Retransmit and Recovery (FRR or Reno), New Reno, Selective Acknowledgement (SACK), Early packet drop (EPD), and Selective Drop on LEO, MEO, and GEO...
Conference Paper
A network running OSPF takes several tens of seconds to recover from a failure, using the current default parameter settings. The main component of this delay is the time required to detect a failure using the hello protocol. Reducing the value of the hellointerval can speed up the failure detection time. However, too small a value of the hellointe...
Article
Signaling aggregation provides a practical approach to fast failure recovery in path-based restoration schemes. This paper proposes several signaling aggregation schemes and demonstrates their potential for improving restoration performance compared with schemes without aggregation.
Article
This paper gives a new definition of general weighted (GW) fairness and shows how this can achieve various fairness definitions, such as those mentioned in the ATM Forum TM 4.0 specifications. The GW fairness can be achieved by calculating the ExcessFairshare (weighted fairshare of the left over bandwidth) for each VC. We show how a switch algorith...
Article
Full-text available
In this paper we present tehniques to to improve the performance TCP/IP over satelliteATM networks, and to provide minimum rate guarantees to VCs carrying TCP/IP traffic. Many future systems are proposing to use ATM or ATM like technology to transport TCP/IP based data. These systems must be designed to support best effort services, as well as enha...
Article
In this paper, we wish to derive analytic models that predict the performance of TCP flows between specified end-points using routinely observed network characteristics such as loss and delay. The ultimate goal of our approach is to convert network observables into representative user and application relevant performance metrics.The main contributi...
Article
Full-text available
In large scale, operational Internet protocol networks, creating timely, accurate and network-wide views of the intradomain topology is a fundamental problem. Topical network backbones consist of hundreds of routers, which establish routing adjacencies with one another through static configuration and dynamic routing protocols, such as open shortes...
Conference Paper
Summary form only given. The introduction of cross-connects (XCs) into optical networks grants us the opportunity to rapidly provision high bandwidth connections. These connections are generally used to carry critical customer data. As such, connection reliability becomes a major concern for both carriers and their customers. We investigated the sc...
Conference Paper
Full-text available
In this paper, we wish to derive analytic models that predict the performance of TCP flows between specified endpoints using routinely observed network characteristics such as loss and delay. The ultimate goal of our approach is to convert network observables into representative user and application relevant performance metrics. The main contributi...
Article
Full-text available
In this paper, we wish to derive analytic models that predict the performance of TCP flows between specified end-points using routinely observed network characteristics such as loss and delay. The ultimate goal of our approach is to convert network observables into representative user and application relevant performance metrics. The main contribut...
Article
Full-text available
Satellite networks play an indispensable role in providing global Internet access and electronic connectivity. To achieve such a global communications, provisioning of quality of service (QoS) within the advanced satellite systems is the main requirement. One of the key mechanisms of implementing the quality of service is traffic management. Traffi...
Article
Full-text available
Viewgraphs on Qualtity of Service (QOS) for real time applications over next generation data networks are presented. The progress to date include: Task 1: QoS in Integrated Services over DiffServ networks (UD); Task 2: Interconnecting ATN with the next generation Internet (UD); Task 3: QoS in DiffServ over ATM (UD); Task 4: Improving Explicit Conge...
Article
Full-text available
Future broadband satellite networks will support a variety of service types. Many such systems are being design with ATM or ATM-like technology. A majority of Internet applications use TCP for data transfer. As a result, these systems must efficiently transport TCP traffic and provide service guarantees to such traffic. Several mechanisms have been...
Conference Paper
Full-text available
Exponential growth of Internet traffic and the proliferation of new user applications warrant the development of a new Internet infrastructure. Due to the fundamental satellite system characteristics such as global coverage, broadcast nature and bandwidth on demand, satellite systems are excellent candidates for providing high data rate Internet ac...
Article
The goal of this paper is the prediction of the steady state throughput of individual TCP flows based on what we term non-invasive network monitoring information. Such information includes performance metrics like aggregate losses that are typically available from routers SNMP MIBs, and estimates of round-trip times that can be obtained using simpl...
Article
Full-text available
A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constellations operating in the Ka-band and above. The next generation broadband satellite systems will use fast packet switching with onboard processing to provide full two-way services to and fro...
Article
Full-text available
This report presents a survey of the traffic management Issues in the design and implementation of satellite Asynchronous Transfer Mode (ATM) networks. The report focuses on the efficient transport of Transmission Control Protocol (TCP) traffic over satellite ATM. First, a reference satellite ATM network architecture is presented along with an over...
Article
Several Ka-band satellite systems have been proposed that will use ATM technology to seamlessly transport Internet traffic. The ATM UBR, GFR, and ABR service categories have been designed for data. However, several studies have reported poor TCP performance over satellite ATM networks. We describe techniques to improve TCP performance over satellit...
Article
Multimedia applications with stringent delay requirements are usually supported by the constant bit rate (CBR) or real-time variable bit rate (rt-VBR) service categories of ATM. This article shows that the available bit rate (ABR) service, which was originally designed for data, can also support multimedia applications under certain circumstances....
Conference Paper
An explicit rate switch scheme monitors the load at each link and gives feedback to the sources. We define the overload factor as the ratio of the input rate to the available capacity. In this paper, we present three overload-based switch schemes which provide MCR (minimum cell rate) guarantees for the ATM (asynchronous transfer mode) ABR (availabl...
Conference Paper
This paper explores the issue of fair allocation of excess network bandwidth between congestion sensitive and insensitive flows in an assured forwarding traffic class. In the absence of any mechanism to distinguish between out-of-profile traffic of congestion sensitive and insensitive flows, congestion insensitive flows will get most of the excess...
Conference Paper
Full-text available
To meet an increasing demand for multimedia services and electronic connectivity across the world, satellite networks will play an indispensable role in the deployment of global networks. A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constella...
Conference Paper
Full-text available
A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, as well as low earth orbit (LEO) constellations operating in the Ka-band and above. At these frequencies satellite networks are able to provide broadband services requiring wider bandwidth than the current services at C or Ku-band. As a consequence...
Conference Paper
We give a general definition of weighted fairness and discuss how a pricing policy can be mapped to general weighted (GW) fairness. The GW fairness can be achieved by calculating the excess fairshare (weighted fairshare of the left over bandwidth) for each VC. We show how a switch algorithm can be modified to support the GW fairness by using the ex...
Article
Full-text available
An explicit rate switch scheme monitors the load at each link and gives feedback to the sources. We define the overload factor as the ratio of the input rate to the available capacity. In this paper, we present four overload based ABR switch schemes which provide MCR guarantees. The switch schemes proposed use the overload factor and other quantiti...
Article
Full-text available
Various issues associated with "Traffic Management for Satellite-ATM Networks" are presented in viewgraph form. Specific topics include: 1) Traffic management issues for TCP/IP based data services over satellite-ATM networks; 2) Design issues for TCP/IP over ATM; 3) Optimization of the performance of TCP/IP over ATM for long delay networks; and 4)...
Article
In this paper, we analyze the behavior of OSPF's interface state machine in a broadcast LAN scenario. We derive several interesting properties of this behavior that help u s estimate the number of DR elections performed and the time required as each router on the LAN settles on the DR/BDR iden- tity. The analytical results are verified using testbe...
Article
Full-text available
: In this contribution we give a general definition of fairness and show how this can achieve various fairness definitions, such as those mentioned in the ATM Forum TM 4.0 Specifications [1]. We discuss how a pricing policy can be mapped to general fairness. The general fairness can be achieved by calculating the ExcessF airshare for each VC. We sh...
Article
In this paper, we examine different aspects of the survivability in IP networks by experimentation on sev-eral current IP backbone network topologies. Maintaining service continuity even under failures requires redundancy in terms of connectivity and capacity. We analyze the cost of survivability for protection against single node failures for trad...

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