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Delay Tolerant Networks (DTNs) are used to deliver messages in cases of intermittent connectivity. Disaster scenarios with multiple Mobile Ad hoc Networks formed by the communication equipment of first responders are one example for such networks. In this paper, we evaluate different delay tolerant routing schemes based on realistic mobility models and traffic patterns. Both options are crucial as...
A multi layered approach is proposed to provide energy and spectrum efficient designs of Cognitive Radio Based Wireless Sensor Networks (CR-WSN) at the smart grid utility. CR-WSNs consume higher power and involve complex design procedure. Since smart grid wireless applications being used currently are meant to save power, we model the CR-WSN based home area networks by keeping minimum power consumption...
In this paper, we present performance evaluation of various routing protocols including SIFT, GPSR and GOSR using different mobility models such as Random Waypoint Model (RWM), Fluid Traffic Model (FTM) and Intelligent Driver Model with Intersection Management (IDM-IM). We present simulation results that illustrate the importance of choosing a mobility model in the simulation of a vehicular network...
We present a new method for routing MAC frames at layer 2 (L2) within an 802.11 MANET. The new method, Multihop Clear Channel Assessment (MCCA), improves on the RTS/CTS mechanism used in the 802.11 DCF by extending it from a single hop protocol to a multihop one. Such an approach can, in some circumstances, eliminate the need for a routing protocol at layer 3 (L3), since frames, instead of being routed...
In this paper, we unified two new algorithms, i.e., to selectively Bordercast the control packets in order to reduce the network load by limiting the number of control packets when ZRP searches for a new route. The second algorithm is proposed to optimize the performance of Query control mechanisms for the Zone Routing Protocol (ZRP) for mobile ad hoc networks for communication on an urban terrain...
Mobile Ad hoc networks (MANETs) are composed of a collection of independent nodes usually connected by low bandwidth Radio Frequency (RF) links which are challenging for transmitting video and high bandwidth applications for rescue workers in emergency situations. Earlier we proposed a routing protocol, called AODVH to use for high bandwidth communication for search and rescue operations in a disaster...
Wireless technology based on the IEEE 802.11 standard is used to support multiple types of communication services (data, voice, and image) with different QoS requirements. Node mobility creates a continuously changing communication topology in which paths break and new one form dynamically. The routing table of each router in an adhoc network must be kept up-to-date. MANET uses Distance Vector or...
This paper analyses the two common routing protocols, AODV and DSR in Ad-Hoc network. On the OPNET network simulation platform, a systematically simulation and research has been carried out on the performance of two routing protocols, and how the network environments impact on the performance of routing protocol. The packet delivery ratio and average delay of these two indicators have been selected...
In this paper, a performance evaluation of the Routing Protocol for Low power and Lossy Networks (RPL) is presented. Detailed simulations are carried out to produce several routing performance metrics using a set of real-life scenarios. A real outdoor network was reproduced in simulation with the help of topology and link quality data. Behaviors of such a network in presence of RPL, their reason and...
ZigBee is a standard that is suitable for wireless sensor networks. In ZigBee, sensor nodes can be connected by a tree topology called distributed address assignment mechanism (DAAM). It has the merits as follows: 1) it is easy to implement; 2) it simplifies the task of routing. It restricts the number of children and the depth of the network by setting a topological parameter set, which is defined...
The protocol independent multicast - sparse mode (PIM-SM) is a multicast routing protocol that uses one center (which we refer to as the rendezvous point ??RP??) for all transmitters in a multicast group. It builds source-specific trees to the transmitters whose data rates exceed a defined threshold. Investigations are done to improve and provide an efficient mechanism for switching between the shared-based...
Multi-hop wireless mesh networks (M-WMNs) have recently emerged as an alternative network infrastructure. For M-WMNs to serve as a network infrastructure, the protocol designs for M-WMNs should target a high network capacity. An efficient backoff algorithm is required to achieve a high network capacity. Most of existing works focused on backoff algorithms for infrastructure environment based on IEEE...
An ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. A number of routing protocols have been implemented to route the packets in these networks. One of these routing protocols is Destination-Sequenced Distance-Vector (DSDV), i.e. a proactive routing protocol. Some important...
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