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Despite recent interests in developing vertical handoff decision algorithms, an essential component of the architecture of the next generation heterogeneous wireless networks, very few studies have so far reported any meaningful comparative performance analysis. This paper attempts to fill this gap in the literature by presenting a comprehensive study on the performance of three vertical handoff decision...
Future wireless access will involve a variety of integrated and interworking technologies. Depending on the conditions (e.g., the specific application, the quality of service requirements, the user mobility) each session will be served through the most suited access network; following some event, there will be a variation of the access technology, which is called vertical handover. Although the use...
The IEEE 802.16e standard provides a high degree of flexibility for setting up and operating mobile WiMAX networks in metropolitan environments. While the standard supports differentiated Quality of Service (QoS), crucial functions such as traffic scheduling and slot allocation are left as open issues to the research community. This paper focuses on these two features, that consist an NP-Hard problem,...
On the background of integration of WSN and mobile network, the mobile agent nodes access to mobile network through the base station and sent data to the remote server to deal with. Because the resource is limit for the mobile network, the throughout of the mobile agent node has threshold. We propose an algorithm for rate control based on non-cooperative Game Theory, which will assign different rate...
The Universal Mobile Telecommunications System (UMTS) is targeted to provide multimedia services which are differentiated in four types: conversational, streaming, interactive and background. In order to guarantee an appropriate Quality of Service (QoS) some algorithms of Radio Resource Management RMM have been created, which are responsible of the efficient use of the air interface. The RRM's algorithms...
In realistic mobile heterogeneous environment, the quality perceived by user is variable and dependant on following major factors: available bit rate variation, packet loss and latency. Even though QoS management is enabled in most modern telecommunication systems, it does not ensure the actual end-user perceived quality of service level. Therefore, to make sure that operator follows SLA provisions,...
The rapid introduction of new mobile data services presents many challenges to wireless service providers. Unlike voice services, whose traffic characteristics are well understood, new data services are far more volatile and their demand on network resources is harder to predict. Data volumes are exploding and impacting not only the ability of the network to support such traffic but are also driving...
The following topics are dealt with: tree-building algorithms; HCM decision tree; grid authorization system; grid scheduling system; evolutionary algorithm; data allocation problem; read-one-write-all monitoring synchronization transaction system; large block FEC; RED queue; TFRC congestion control; TCP; mobile ad hoc networks; vehicular ad hoc networks; wireless sensor networks; failure route protocol;...
Multicast application is one of key value-add field to cellular mobile network. Most of researches focus on the whole system and ignore the structure inner cell. Current structure must let the signal strength satisfy the request of terminals located on the edge of cell, and this influence the capacity and data rate of multicast in same cell. we propose a cooperative relay multicast structure for cellular...
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,...
Wise resource allocation is necessary to increase the quality of service (QoS), the system capacity, the network performance, and also decrease the power consumption and connection cost. This paper, first, investigates the located global system for mobile (GSM) network in a region of Tehran province in Iran as a case of study and then proposes a novel approach to minimize the connection cost among...
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...
Vehicular ad hoc networks (VANETs) are an extreme case of mobile ad hoc networks (MANETs). High speed and frequent network topology changes are the main characteristics of vehicular networks. These characteristics lead to special issues and challenges in the network design, such as in medium access control (MAC). Due to the high speed and frequent network partitions, it is difficult to design a MAC...
Mobile radio networks of the IMT-Advanced systems family promise ubiquitous broadband access and high area coverage, with rates of several 100 MBit/s. They claim to guarantee QoS support in terms of low delay and guaranteed throughput. However, with the availability of flat rate plans and bandwidth-hungry applications of future mobile devices the systems are facing a hard challenge in satisfying all...
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...
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...
The Multicast Quality of Service (QoS) routing emphasizes to find a set of paths from a source node to a destination node set satisfying the QoS requirements. In this paper, we consider the two problems in Multicast QoS Routing called the MCM (Multi-Constrained Mutlicast Tree) and the MCOM (Multi-Constrained Optimal Multicast Tree). They are all NP-complete problems. We first formulate them as Quadratic...
Protocol with QoS guarantee in unidirectional MANET is very important. Many of the classical routing protocols are put forward on the basis of two-way communication. While there exits unidirectional link because of differences in transmission power in each terminals as well as environmental factors such as topography and so on. This paper studies and applies the shortest path method based on graph...
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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