A Survey of MANET Routing Protocols in Large-Scale and Ordinary Networks

An ad hoc network (MANET) consists of mobile nodes that communicate with each other. Routing in ad hoc network is a challenging task because nodes are mobile. Efficient routing protocols have better performance in such networks. Many protocols have been proposed for ad hoc networks such as: Ad hoc on-demand Distance Vector (AODV), Optimized Link State Routing (OLSR), Dynamic Source Routing (DSR), and Geographic routing protocol (GRP). these approaches have not been evaluated for the same conditions in pervious researches. But in this study, the performance of these protocols is evaluated in various network conditions and with different packet size patterns. Also, different MAC layers like 802.11b, 802.11g in ordinary and large-scale networks are considered. For the evaluation, Different metrics like packet delivery ratio, end-to-end delay, Mac delay and Routing traffic received/sent, are applied. All simulations have been done using OPNET

Nuovi protocolli per gestione dati e comunicazione Real-time in ambito agricolo

In the last years, Precision Farming and Farm Automation in Agricultural field, have been requesting short range wireless communication systems for machine synchronization and long range wireless communication for fleet management, and for production and task control in real time. Existing protocols can meet the requirements only partially: different legislation and product availability in different countries make it difficult to identify a solution for the global market. TCP/IP protocol and GPRS/GSM networks meet some requirements for long range communication, but not for real time communication needed for short range communication. The synchronization specifications require a real time wireless communication protocol affordable, safe and with low latency, in order to ensure a minimum guaranteed throughput apt to synchronize the machine work and travel. Moreover there are some information security requirements to fulfill in order to guarantee safe data transmission. The paper presents a comprehensive proposal based on UDP and IP protocols with embedded controls, apt to create an isochronous wireless communication for machine synchronization, and some other methods and protocols to fulfill long range data communication requirements of the Agricultural field

Evaluation of MANET Routing Protocols in Realistic Environments

Projecte final de carrera realitzat en col.laboració amb College of Electronics and Information Engineering. Tongji UniversityRecently, many researchers have become interested in MANET (Mobile Ad-hoc NET- works) to construct a self-con gurable network without existing communication infras- tructure. This research presents the results of a detailed performance evaluation on several MANET routing protocols working under realistic environments. The routing protocols, mobility models and other aspects are explained and discussed in order to know how to use them properly to model real-life conditions. NS-2 and Bonnmotion were used to create the networks, services and environment characteristics in general. It is concluded which protocols can handle which applications and which not and that the performance of the protocols can be considerably di erent when more and more realistic elements are taken into account. This should be considered in further researches since the nowadays evolution of MANET will bring them soon into services of our society