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Low-power personal area networks (LoWPANs) are still in its early stage of development, but the range of conceivable usage scenarios is tremendous. The numerous possible applications of Wireless Sensor Networks (WSNs) make obvious that mesh and multi-technology topologies will be prevalent in LoWPAN environments and mobility support will be a necessity. Mobility based communication can prolong the...
The widespread use of electronic equipments and their integration into the vehicular system have become a necessity in the automobile industry. The Smart Transducer concept -along with IEEE Standard 1451- improves the scalability of these networked electronic devices into a vehicular system. This paper describes the design and implementation of a real-time environmental wireless sensor network that...
Mobile Ad hoc Network (MANET) is the cooperative engagement of a collection of wireless mobile nodes without the support of any centralized access point or existing infrastructure. The use of virtual topologies is a good alternative to build wireless multi-hop networks. It aims to maintain a topology that optimizes broadcasting or network performances. The problem is to determine an appropriate topology...
This paper presents the results of the comparative analysis of two different protocols that use or could potentially use the Ultra Wideband (UWB) radio technology - Certified Wireless-USB and Bluetooth 3.0 with UWB. Bluetooth 3.0 with UWB is found to have a number of advantages over Certified Wireless-USB. These include lesser overheads, higher throughputs, higher power efficiency, better device association...
A Mobile Ad hoc Network (MANET) is a collection of wireless mobile terminals that are able to dynamically form a temporary network without any aid from fixed infrastructure or centralized administration. In recent years, MANETs are continuing to attract the attention for their potential use in several fields such as military activities, rescue operations and time-critical applications. In this paper,...
Lack of well-defined defense perimeter in MANETs prevents the use traditional firewalls, and requires the security to be implemented in a distributed manner. We recently introduced a novel deny-by-default distributed security policy enforcement architecture for MANETs by harnessing and extending the concept of network capabilities. The deny-by-default principle allows compromised nodes to access only...
In order to fulfil the demand for on-the-move and uninterrupted internet connectivity in Mobile Networks, the IETF (Internet Engineering Task Force) has standardized NEMO Basic Support Protocol in as RFC 3963. However, providing a low latency handoff performance in mobile networks by using fast handover mechanism to ensure a seamless mobility for users is one of the main objectives of ongoing research...
Diameter protocol is getting more and more important roles in Next Generation Mobile Network Infrastructure. However, in many cases Diameter interfaces are still under standardization. In this paper, we introduce a flexible Diameter based testing system. The strong point of this system is the capability to keep up with the development of Diameter related standards. It is also friendly, scalable and...
A Mobile Ad Hoc Network (MANET) is a dynamic wireless network that can be formed without the need for any pre-existing infrastructure in which each node can act as a router. Because mobile nodes have limited battery power, it is therefore very important to use energy in a MANET efficiently. In this paper, we provide an energy Entropy Multipath Routing optimization algorithm in MANET based on GA (EMRGA)...
To solve the collaboration issues between wireless Ad Hoc networks and Overlay Network, an Ad Hoc overlay network model was presented and a Key-based Indexing Mechanism (KIM) was proposed accordingly, based on the distributed algorithm of Overlay Network and mobile node local routing algorithm. The mechanism combines protocol of Overlay Network in Logical namespace with routing protocol of mobile...
The architecture of TETRA digital trunking protocol stack is described in this paper. The procedure and development of energy economy mode are stated in details. The protocol conformance tests of energy economy mode are implemented in the simulation environment, and simulation test results show that the devolopmented protocol stacks of energy economy mode are in accordance with “ETS 300 392-2 TETRA...
Recent statistics show an increase in environmental disasters, a fact which is also perceivable to the public as reports of avalanches, earthquakes and landslides mount in media coverage. Search and Rescue with modern localization techniques consequently attracts attention from scientific and industrial sides. This paper introduces one part of the I-LOV project, endorsed by the Federal Ministry of...
Routing is one of the most challenging open problems in Vehicular Ad hoc NETworks (VANETs) because of the short-lived wireless connectivity environment. Store-carry-and-forward approach using buses on regular routes is considered as one of the most promising emerging routing policy that can significantly improve delivery performance and reliability in VANETs. While none of existing solutions considers...
The paper is devoted to logical implication of MANet's protocols for gateway discovery in IPv6 Wireless Sensor Networks (IPv6-WSN). We implement three approaches in NS-2 simulator and evaluate its performance under the specified field of the networks of gateway discovery. The performance results present the packet delivery ratio and delay of end to end communication networks. The AODV protocol is...
TCP protocol generally suffers from poor performance and network unfairness problems over multi-hop ad hoc networks. As designed for wired networks only, the legacy TCP always induces the over-reaction of network failure and hurts the quality of end-to-end connection in ad hoc networks. In this case, improvements have been proposed in the literature to help TCP to be aware of the different types of...
This paper studies on a client / server wireless network model of hand-held mobile devices for land surveying and mapping industry, and accesses the credibility and methods of data communication between different programs through multi-threaded and socket. Key issues and technologies are discussed through practice, that wireless internet facilitate GIS data transfer, and multi-threaded applications...
Recently slotted protocols have been demonstrated to work also in a distributed way and in a vehicular scenario. In particular one of them, MS-Aloha, has shown interesting scalability features. Despite a comparative analysis between CSMA/CA (IEEE 802.11p) and MS-Aloha has already been proposed in a simplified topology, a deep analysis on the efficiency of the two protocols has not been achieved: in...
The Intelligent Transportation Systems (ITS) currently attract a lot of attention. Many simulators and some testbeds have been proposed to validate new ideas and to guide new theoretical developments. Yet, to this date, simulator tools and testbeds evolve in disjoint research work. We developed Airplug-ns, an open source simulation environment, as a step towards bridging this gap. This environment...
Long registration delay and signaling cost restrict the practical deployment of MIP. Proxy Mobile IPv6 has been proposed to overcome limitation of Mobile IP, which can avoid tunneling overhead and support of hosts in the mobility management. In this paper, we propose an extension protocol based on Proxy Mobile IPv6 to reduce the overhead of Local Mobile Anchor and decrease handoff delay. When the...
The throughput and reliability indexes of broadcasting protocol is related to contention windows valve and contending nodes in vehicular ad networks. To find suitable contention window value which can optimize the throughput and reliability of broadcasting protocol, this paper propose theoretical analytic model to analysis the relationship between the throughput and the reliability. So, the analysis...
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