The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Recently, the IETF MIPSHOP working group proposes Fast PMIPv6 (FPMIPv6) and Transient Binding PMIPv6 (TPMIPv6) to reduce the handover latency and packets loss of PMIPv6. The research and standardization of FPMIPv6 and TPMIPv6 are just in the initial stage. The system performance analysis of them is benefit to the protocol design and deployment. In this paper, through the theoretical analysis and system...
Channel assignment schemes in Multi-Radio Wireless Mesh Networks (MR-WMNs) usually leave several links sharing the same channel within overlapped transmissions or interference ranges; this is especially true when only one radio is used or when the number of radios is very small compared to the number of orthogonal channels. In order to further improve MR-WMN performance, especially for mobile multimedia...
In this paper, we derive the general expressions of the throughput capacity scaling of mobile ad hoc networks (MANETs), and find that the strategy of an individual node determines the throughput of an MANET. We show that optimal strategies that maximize the throughput of the network can exist. Based on a game theoretic approach, we further show that the optimal strategies constitute Nash equilibria.
In the context of micro and macro-mobility capabilities defined by IEEE 802.16e/WiMAX standards, the paper presents the simulation campaign undertaken to identify the sets of configuration parameters having a major impact on the handover process for the IEEE 802.16e mobile station. Simulation results could then be used to construct a database for guiding some cross-layer optimization algorithms deciding...
The Cache-and-Forward (CNF) protocol architecture was proposed to support efficient mobile content delivery services in the future Internet. In contrast to the TCP/IP protocol stack which is based upon the assumption of reliable end-to-end path through the network, the CNF architecture considers varying access link speed/quality and periods of disconnection as inherent properties of the network. Routers...
This paper analyzes the delay performance of Enhanced relay-enabled Distributed Coordination Function (ErDCF) for wireless ad hoc networks under ideal condition and in the presence of transmission errors. Relays are nodes capable of supporting high data rates for other low data rate nodes. In ideal channel ErDCF achieves higher throughput and reduced energy consumption compared to IEEE 802.11 Distributed...
The most common physical layer models for network simulations are the bit error rate and the SNR threshold model. In time-varying channels such as those experienced in vehicular networks, these models are assumed valid as long as the packet duration is less than the coherence time of the channel. The coherence time is a statistical measure of the channel invariance. It is independent of the signal...
There has been a variety of rate adaptation solutions proposed for both indoor and mobile scenarios. However, dynamic channel changing conditions (e.g., temporal channel variation due to unpredictable traffic pattern) make it virtually impossible to guarantee the same evaluation environment for all these schemes. Moreover, developing these schemes exhaustively on actual hardware can be gruesomely...
Considering that nodes move in wireless ad hoc networks, network topology and node locations change. A single transmission power can not meet mobile ad hoc networks. This paper proposes transmission power optimization algorithm based on various nearest-neighbor distances algorithm. Transmission node is informed of neighbor node locations in its maximum transmission range through network location management...
WiMAX (IEEE 802.16) has emerged as a promising radio access technology for providing high speed broadband connectivity to subscribers over large geographic regions. New enhancements allow deployments of relay stations (RSs) that can extend the coverage of the base station (BS), increase cell capacity, or both. In this paper, we focus on deploying RSs for the purpose of coverage extension. We propose...
Mobile Wireless Ad Hoc Networks (MANET) is network without infrastructure, where every node functions as transmitter, router and data sink. Every node must discover its local neighbours and through them it will communicate to nodes that are out of its transmission range. The routing mechanisms in MANET must be able to overcome the interaction of three fundamental difficulties such as contention, congestion...
Mobile devices with ever increasing functionality are an important driving force behind innovative mobile applications that enrich our daily life. The ubiquitous availability of wireless data communication networks is an additional driving force. Their ability to support application data flows is one of the performance criteria for successful mobile application deployment. Nevertheless, the quantitative...
WiMax mobile cellular systems are envisioned to provide high data rate multimedia service to users at any time, anywhere at an affordable cost. WiMax is operated at a frequency higher than 2 GHz because of the intensive usage of the frequency bands below and around 2 GHz by the current 2 G, 3 G and other systems. At fixed transmission power, both high data rate and high frequency indicate smaller...
IEEE 802.11 is one of the wireless network MAC/PHY protocols. Though IEEE 802.11 a/b/g offers more than one non-overlapping channels, IEEE 802.11 a/b/g uses just one channel for communication. These days, NICs(Network Interface Cards)'s cost has been decreasing and its performance has been increasing. Therefore, the mobile nodes are able to use more than one interface and many channels simultaneously...
In this paper, we consider the throughput performance in relay-aided multi-cell orthogonal frequency division multiple access (OFDMA) system, when mobile user (MS) is uniformly distributed and relay station (RS) is located at some typical positions, such as dRS = 0:5 and dRS = 0:85, where dRS is the ratio between the distance from RS to base station (BS) and the cell radius. Although cooperative diversity...
Carrier sensing mechanism has been adopted in IEEE 802.11 MAC for collision avoidance under single channel based wireless ad hoc networks. However, due to the hardware limitation, the carrier sensing mechanism can not help much in single transceiver and multi-channel scenarios. In this paper, we propose a pipelining multi-channel (pi-Mc) MAC protocol for multi-channel ad hoc networks. The core idea...
Recently, in an assessment of the potential damage that may result from a NANKAI linkage-type earthquake, expected to occur in the future, we became concerned about information isolation that may arise in the case of many islands of Seto Inland Sea. Further, when a disaster strikes an island, a vessel and an operation ship (liner) have been utilized for providing the disaster-stricken areas with support...
Content distribution applications such as video streaming, file sharing, and network gaming are posing strict requirements on the development and enhancement of communications technologies, architectures, and protocols. Collaboration is one of the central techniques for designing enhanced communication networks. In this work, we address the problem of collaborative content distribution where destination...
Currently, in any MANET, one protocol routes packets to their destination regardless of the network context. This `one size fits all' approach is far from optimum. Therefore, in this paper, we introduce an Intelligent MANet routing protocol system (IMAN), which employs Genetic Algorithms to select the most optimum protocol based on the network context. Comprehensive performance models of three MANET...
In multi-hop wireless mobile ad hoc network each node is capable of sending, receiving and forwarding data packets. Since it is an infrastructure-less networks, it makes it feasible to set up at anyplace and at any time. Supporting Quality of Service (QoS) in such network is a challenge due to limited available resources like bandwidth etc. This paper describes a new approach of Medium Access Control...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.