Ad hoc networks are characterized by multihop wireless connectivity, frequently changing network topology and the need for efficient dynamic routing protocols. We compare the performance of three routing protocols for mobile ad hoc networks: Dynamic Source Routing (DSR) , Ad Hoc On-Demand Distance Vector Routing (AODV), location-aided routing(LAR1).The performance differentials are analyzed usi...

The application of multihop Wireless Ad Hoc Networks (WANETs) has been facing a great challenge to implement cooperative control over user transmission rates under the resource restrictions. In this paper, we propose an efficient bandwidth allocation scheme called Active-Time-Based Bandwidth Allocation Scheme (ATBAS) that can ensure fair bandwidth allocation among the users in a multihop WANET ...

This thesis presents several techniques that enhance the performance of wireless mobile devices that communicate without depending on a supporting infrastructure. These networks are commonly referred to as ad hoc networks since they operate in highly dynamic environments and, therefore, must utilize available resources. The primary focus of this thesis is on improving the performance of ad hoc ...

A mobile ad hoc network is a collection of digital data terminals equipped with wireless transceivers that can communicate with one another without using any fixed networking infrastructure. Communication is maintained by the transmission of data packets over a common wireless channel. The absence of any fixed infrastructure, such as an array of base stations, make ad hoc networks radically dif...

There has recently been an increasing interest in convergence of p2p and ad hoc network research. Actually, p2p systems and multihop ad hoc networks share similar features, such as self-organisation, decentralisation, self-healing, and so forth. It is thus interesting to understand if p2p systems designed for the wired Internet are suitable also for ad hoc networks and, if they are not, in whic...

With the advancement in radio technologies like Bluetooth, IEEE 802.11 or Hiperlan, a new concept of networking has emerged. This is known as ad hoc networking where potential mobile users arrive within the common perimeter of radio link and participate in setting up the network topology for communication. Nodes within ad hoc are mobile and they communicate with each other within radio range th...

LTE Advanced is a well designed system that meets the requirements of 4G cellular systems. Its standard specification has been lately released. One of its main features is supporting relaying topology inspired from ad hoc multihop networks. This paper is a survey upon the relaying architecture of LTE Advanced standard based on 3GPP Release 10 specifications. A comparison with other relaying arc...

A prerequisite for the mass-market deployment of multihop ad hoc technologies is the capability of integrating with existing wired infrastructure networks. However, current solutions to support connectivity between ad hoc networks and the Internet are based on complex mechanisms, such as Mobile-IP and IP tunnelling. In this paper we propose a lightweight solution based on simple Layer-2 mechani...

The IEEE 802.11 MAC protocol for medium access control in wireless Local Area Networks (LANs) is the de facto standard for wireless ad hoc networks, however, it does not perform well in terms of delay, throughput, and specially, fairness in multihop wireless ad hoc networks. Many researches have been published in this area. Among them, a modification of the IEEE 802.11 MAC protocol was proposed...

The wireless medium must be effectively shared in an ad hoc network. The multihop nature of the network demands it, with packets often requiring several transmissions in order to reach their destination. This paper describes a mechanism for improving the IEEE 802.11 MAC specifically for ad hoc networks. The Forward Focus mechanism uses the forwarding nature itself to improve the efficiency and ...