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In this paper, we compare communication schemes in scenarios of interest for underwater networks where multiple nodes collaborate towards the accomplishment of a target detection and tracking task. We consider two specific cases: in Scenario 1, a mobile Autonomous Underwater Vehicle (AUV) i) collects data from a set of fixed sensors deployed on the seafloor or ii) transmits data to the same nodes...
Currently, Transmission Control Protocol (TCP) is the dominant protocol used in the Internet. It is the transport protocol that is responsible for the transmission of around 90% of the Internet traffic. TCP was originally designed for wired network where packet loss due to congestion dominates. Mobile Ad Hoc Network (MANET), one of the wireless networks, has special characteristics which cause several...
In this paper, mobile WiMAX trials are analysed to investigate the vehicular down-link performance for a number of on-car antenna configurations. The directionality and optimum polarization of the vehicular antennas are shown to improve both the range and throughput of the system. These improvements are attributed to the additional directive gain, and the reduced multi-input multi-output spatial correlation...
Vehicular ad hoc networks (VANETs) have been proposed to provide safety and non-safety services for the passengers on board. Reliability in broadcasting of safety messages is one of the fundamental challenges in the design of such networks. In this paper, we study the impact of employment of repetition and piggybacking techniques on the performance of safety messages dissemination in an IEEE 802.11e-based...
In this paper we investigate the coverage and capacity of WCDMA (Wideband Code Division Multiple Access) Release 99 (Rel. 99) and HSDPA (High-Speed Downlink Packet Access) Rel. 5 indoor networks. The proposed design principles allow a close agreement between analytical and field measurements for remarkable network parameters: path loss, received signal strength and throughput.
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,...
In this paper, we introduce cognitive wireless network for a disaster information system based on dynamic network reconfiguration method to improve the connectivity. Our network system is consisted of multiple mobile routers based on currently available wireless LANs including IEEE802.11b,g,j,n, IEEE802.16 (WiMAX), cellular networks. Using those different standardized wireless networks, the disaster...
Carrier Aggregation (CA) has been regarded as an important technology for Long Term Evolution-Advanced (LTE-A) which is currently standardized in the Third Generation Partnership Project (3GPP). CA is introduced to meet the requirement of very-high-rate-data transmission over wide bandwidths e.g. up to 100MHz. In this paper, the problem of power allocation restriction in the LTE-A system with CA has...
This paper presents a novel adaptive video streaming framework designed for OFDM-based mobile networks. The proposed adaptation algorithm exploits the benefits of the Scalable Video Coding (SVC) extension of the H.264/AVC standard together with cross-layer information from the mobile terminals in performing adaptation that maximizes streaming qualities amongst all participating users. Simulations...
Mobile ad-hoc network (MANET) is a collection of intercommunicating mobile hosts forming a spontaneous network without use existing infrastructure. The mobility model represents the moving behavior of each mobile node in the MANET that should be realistic. It is a crucial part in the performance evaluation of MANET. In this paper, we have studied the effects of various random mobility models on the...
We consider the case of a Mobile Ad-Hoc Network (MANET), with nodes that have multiple packet reception (MPR) capability This is done by segmenting the incoming signal in a series of time-overlapping windows, each to be processed by an algorithm that separates each transmitter signal, as suggested in other works We will focus on the effect of varying the overlapping length. In this paper we addressed...
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...
To combat the challenges(the mismatch between throughput and layer delivery ratio, the useless packets in high layers due to the loss of packets in low layers) brought by the layered encoding to data scheduling for P2P streaming in the mobile network, We propose a new data scheduling scheme, named MLayerP2P. The key idea of the MLayerP2P is: A 3-Stage Model is used to schedule the absent streaming...
The primary concern of broadband wireless technologies is to provide the end-to-end Quality of Service (QoS) for integrated real-time and non real-time applications. The main focus of the IEEE 802.16d/e MAC layer is to manage the radio recourse in an efficient way. The basic functional blocks of the QoS model are addressed by the standards to support five different types of service classes. However,...
We propose an effective path selection considering current traffic load for IEEE 802.16j MMR networks. Previous schemes either consider channel quality or the number of hops in choosing the effective path for traffic to MSs. Our scheme avoids crowded links even though they have high channel quality. Our scheme balances between the channel quality and the current traffic load, aiming at higher fairness...
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...
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...
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...
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;...
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