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Mobile Ad hoc network is a self-organizing, multi-hop and wireless network. This kind of networking is convenient to construct because it is free of time and space and it can be constructed without infrastructure. It has been widely used on many occasions such as danger zones, military regions, hospital and family. Due to the dynamic changes of topology, Ad hoc network has its particularity of routing...
With the advantages of asynchronous and loosely coupled communication model, the Publish/Subscribe system has been widely spread in large-scale distributed mobile networks. According to the MANET's characteristics of dynamic topology and bandwidth-constraint, we propose an application scheme of Publish/Subscribe system over clustering MANET. We improve the cluster header by adding the Information...
This paper intends to propose a novel handover algorithm to balance the load of the layers in a multi-reuse scenario. Each layer works independently from each other and it has its own scheduling process, coverage and mobile stations attached. The algorithm proposed balances the resources among layers by moving mobile stations from one to another layer according their QoS requirements and channel condition...
Although establishing stable routes for routing can improve the performance of mobile an hoc networks (MANETs), the improvement will be weakened to a degree for the stability of route is sensitive to the motion of node. In this paper, based on a basic stability-oriented routing scheme, named FORP, we involved two mobility-adaptive mechanisms in it. One mechanism is the real-time update of stability...
In mobile radio communications there is an ever-increasing demand for high speed and high quality data transmission. Error correction and multi-channel reception are two promising techniques incorporated in the present-day cellular system to attain high-quality and high-speed communication is a multipath fading environment where the rapid variations of the channel gain degrades the transmission quality...
The integration of mobile relays in cellular networks has been recently envisioned as a way of increasing system capacity, coverage and reducing communication energy consumption. In we studied how store carry and forward (SCF) relaying within the cell can be utilized as an underlay message forwarding mechanism to achieve system wide energy savings. In this paper, by deriving optimal routing policies...
Micromobility protocols have been proposed to provide seamless local mobility support. There are several micro mobility protocols such as HMIP, Cellular IP and HAWAII. This paper focuses on the performance of single stream forwarding scheme of HAWAII . An analytical model is developed for the evaluation. The aim of the paper is to investigate the impact of the buffering at the old base station on...
In this paper, we propose an Entropy-based Stability QoS Routing with Priority scheduler in MANET using fuzzy controllers (ESQR). The main idea of ESQR algorithm is to construct the new metric-entropy and select the stability path with the help of entropy metric to reduce the number of route reconstruction so as to provide QoS guarantee in the ad hoc network. Controllable elements in the different...
In this paper, we designed a Reed-Solomon(240, K) structure for CMMB system, which was based on analyzing the coding theory of Reed-Solomon(RS) code in CMMB system, the design of encoder was taking advantage of FPGA, could complete coding for data stream from the upper layer quickly and efficiently. We also analyzed the structure of multipliers in RS encoder, that are simple and can achieve high speed...
We study the Minimal Delay Path (MDP) of message delivery and its evolving properties in social opportunistic networks where the connectivity is intermittent and evolving over time. Through in-depth analysis of the public released trace dataset from CRAWDAD community, our results show that the network connectivity is highly depended on some rare nodal contacts that occurred only few times rather than...
In distributed antenna system (DAS), delay spreads between the receiver and each transmit antenna are different due to the unequal propagation delays from distributed transmit antennas to mobile receivers. To exploit the merit of DAS, power spreading in distributed transmit antennas is proposed for OFDM-based MIMO systems over frequency-selective fading channel. In this scheme, partial power of the...
As an essential part of Multi-channel MAC protocol, the channel scheduling algorithm aims at enhancing the network throughput and resource utilization. Based on the WAVE standard in vehicular communications, this paper improves WAVE MAC by using the time division access on service channels and proposes a channel scheduling scheme to negotiate and allocate the channel resources for throughput-sensitive...
Without any pre-existing fixed network infrastructure with rapid configuration of wireless connections on-the-fly, network topology in MANETs keep on changing rapidly. Thus achieving data transmissions between wireless nodes in MANETs with improved QoS parameters become a challenging issue. To achieve this one has to concentrate on the routing protocol they choose. In our paper we proposed an algorithm...
For vehicle-to-vehicle (V2V) communication, suitable routing protocols are needed. An adaptive cross-layer multi-path routing protocol, R-S-AOMDV, is proposed. The routing metric combines hop-count, link-quality and vehicle-motion information. To make use of advantages of multi-path routing protocol, such as decrease of route discovery frequency, the protocol is designed based on the improvement of...
In this paper, we address the problem of low-latency routing in a vehicular highway network. To cover long highways while minimizing the number of required roadside access points, we utilize vehicle-to-vehicle communication to propagate data in the network. Vehicular networks are highly dynamic, and hence routing algorithms that require global network state information or centralized coordination...
In this paper the Policing Traffic Management (PTM) is applied to improve the Quality of Service (QoS) over Inter-Vehicular Communications (IVCS). Bangkok is the capital city, and it is crowned of Ad Hoc nodes such as Mobile Ad Hoc Networks (MANET), FleetNET, CARNET, BTSNET and electronic devices. Each network has unique data traffic characteristics. For MANNET, most traffic is video and voice traffic;...
Guaranteeing quality of service is a key problem to multimedia stream in mobile Ad Hoc networks. The related works study the channel delay and bandwidth based on the MAC layer; however, there is little focus on queue delay. In a mobile environment, the changing of queue is quite different from those in static conditions. How to calculate the queue delay is a challenging question in mobile Ad Hoc networks...
Many applications and protocols are planned for the so-called Intelligent Transportation Systems (ITS). Most of them are supposed to work in dynamic networks, such as the vehicular ad hoc networks (VANET). However, designing and studying distributed applications and protocols in such networks is not easy. Analytical studies suffer from the lack of pertinent models. Simulations are often far from reality...
The autonomous nature of Mobile Ad hoc Networks (MANETs) makes them suitable for the support of extreme emergency rescuer IP communications for next generation networks. A major hurdle towards the deployment of emergency MANETs (eMANETs) is the design of a distributed routing protocol that can adapt to its highly dynamic topology where the number of nodes in the network frequently varies. This paper...
For increasing safety of driving, intelligent vehicles in vehicular ad hoc networks (VANETs) communicate with each other by sending announcements. The existence of a system that guarantees the trustworthiness of these announcements seems necessary. The proposed approach generating announcements should be preserved from internal and external attackers that attempt to send fake messages. In this paper,...
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