Modifying the HIPERLAN/1 CAC layer protocol for intermittent connectivity

2010 ◽  
Author(s):  
Constantine Coutras
Keyword(s):  
Intermittent Connectivity

scholarly journals Feature Extraction of Real-World Traces Using K Means Clustering In OppNet

2021 ◽  
Author(s):  
Rahul Johari ◽  
Tanvi Gautam
Keyword(s):  
Network Topology ◽  
Real World ◽  
Network Performance ◽  
Performance Metrics ◽  
Learning Algorithm ◽  
Dynamic Network ◽  
Delivery Ratio ◽  
Communication Link ◽  
Alternative Measure ◽  
Intermittent Connectivity

Abstract Natural calamities leave people helpless by arising several situations such as network breakdown, zero communication, intermittent connectivity, dynamic network topology. In such situation an application of dynamic and intermittent routing scheme is essential to make further communication possible during likewise scenarios. An application of TCP/IP becomes futile in mentioned circumstances as it best works for static nodes and pre-defined network topology wherein source and destination nodes are first establishing the communication link with each other. An alternative measure of such hitches is to encounter an application of DTN protocol which possess all characteristics to withstand in such scenarios such as; dynamic network topology, intermittent connectivity, frequent path breaks, store – carry – forward fashion. In this paper we did thorough investigation of forest fire dataset (Uttarakhand) after exploring its implementation in ONE with Epidemic, Prophet, Spray and Wait, HBPR, GAER respectively. An extensive and thorough investigation for real world traces implementation has been done with OppNet routing protocols against mobility models namely; Shortest path map – based, Random Direction, Random Walk, Random Waypoint, Cluster Movement respectively for network performance metrics namely packet delivery ratio, packet overhead ratio and average latency ratio respectively with the application of K means clustering machine learning algorithm. With the help of this analysis, we explore the real-world traces characteristics and study the areas on which network performance can be improved.

Wireless Networks

2017 ◽  
pp. 80-94
Author(s):  
Monika Rani ◽  
Harish Kumar
Keyword(s):  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Propagation Model ◽  
Wireless Devices ◽  
Limited Bandwidth ◽  
Intermittent Connectivity ◽  
Greedy Forwarding ◽  
Moving Vehicles ◽  
Signal Fading ◽  
Wireless Infrastructure

VANET is a type of Mobile Ad-hoc network (MANET) that provides wireless communication between close by moving vehicles as well as between vehicles and road side fixed equipment. It requires the vehicles to be equipped with sensors and wireless devices and fixed roadside wireless infrastructure. There are number of research issues like Highly Dynamic Topology, Signal fading, Limited Bandwidth, Intermittent Connectivity, Mobility Modelling, Propagation Model, Routing which needs attention. The scope of this chapter is focused on various advances in Greedy Forwarding routing techniques. Various VANET routing protocols are reviewed and compared in this chapter.

Opportunistic Networking in Delay Tolerant Vehicular Ad Hoc Networks

2010 ◽  
pp. 282-300 ◽  
Author(s):  
Ashish Agarwal ◽  
Thomas D.C. Little
Keyword(s):  
Short Range ◽  
Vehicular Ad Hoc Networks ◽  
Safety Information ◽  
Collision Warning ◽  
Intermittent Connectivity ◽  
Real Time Traffic ◽  
Moving Vehicles ◽  
And Performance ◽  
Hoc Networks ◽  
Safety Features

Vehicular Area Networking (VANET) is an emerging technology to support a class of applications involving communications between vehicles, and vehicles and the environment. Activity in this area includes development of the Dedicated Short Range Communication (DSRC) protocol aimed at enabling vehicles to exchange safety information to enhance awareness of the vehicle beyond the line of sight, and to enhance safety features such as active braking and collision warning. While safety is the primary driver for development, additional applications emerge as potential users of this technology that are more general in nature. Real-time traffic and route updates, traffic monitoring, remote diagnostics, general purpose Internet access and in-car entertainment are examples that require data collection and dissemination analogous to the wired Internet. However, DSRC and related short-range communications technology would appear to be insufficient for these scenarios. In this chapter, we describe, how and under what conditions it is feasible, and in fact desirable, to use short range communications. We describe a network formed over moving vehicles implemented by short-range communication and thereby analyze factors that affect the design and performance. Observations reveal intermittent connectivity between vehicles traveling on the roadway in opposite directions that hinders applications. Techniques adapted from related research in computer networks provide solutions for enabling networking in a fragmented network of moving vehicles. We elaborate and demonstrate analytically the application of techniques that enable networking through short-range communication.

Intermittent Connectivity Maintenance With Heterogeneous Robots

2020 ◽  
pp. 1-21
Author(s):  
Rosario Aragues ◽  
Dimos V. Dimarogonas ◽  
Pablo Guallar ◽  
Carlos Sagues
Keyword(s):  
Intermittent Connectivity ◽  
Heterogeneous Robots ◽  
Connectivity Maintenance

scholarly journals A Rough Penalty Genetic Algorithm for Multicast Routing in Mobile Ad Hoc Networks

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Chih-Hao Lin ◽  
Chia-Chun Chuang
Keyword(s):  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Rough Set Theory ◽  
Multicast Routing ◽  
Adaptive Method ◽  
Multicast Tree ◽  
Path Delay ◽  
Routing Problems ◽  
Intermittent Connectivity ◽  
Mobile Ad Hoc

Multicast routing is an effective way to transmit messages to multiple hosts in a network. However, it is vulnerable to intermittent connectivity property in mobile ad hoc network (MANET) especially for multimedia applications, which have some quality of service (QoS) requirements. The goal of QoS provisioning is to well organize network resources to satisfy the QoS requirement and achieve good network delivery services. However, there remains a challenge to provide QoS solutions and maintain end-to-end QoS with user mobility. In this paper, a novel penalty adjustment method based on the rough set theory is proposed to deal with path-delay constraints for multicast routing problems in MANETs. We formulate the problem as a constrained optimization problem, where the objective function is to minimize the total cost of the multicast tree subject to QoS constraints. The RPGA is evaluated on three multicast scenarios and compared with two state-of-the-art methods in terms of cost, success rate, and time complexity. The performance analyses show that this approach is a self-adaptive method for penalty adjustment. Remarkably, the method can address a variety of constrained multicast routing problems even though the initial routes do not satisfy all QoS requirements.

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