Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Wireless networks rely greatly on security for authentication and confidentiality, due to the use of an open communication medium. The tendency to incorporate wireless capabilities in battery powered hand-held devices makes it difficult to enforce security because of computational resources and battery capacity limitations. One approach to this problem consists in adaptable security mechanisms: different...
Wireless mesh networks are an efficient solution for Internet access provision in areas without fixed infrastructure. A centralised energy-efficient and load-aware strategy is proposed for the unified management of radio resources of multi-radio nodes, combining rate adaptation, power control, gateway rate-control and channel assignment mechanisms. An analysis of various hexagonal deployments and...
Many dynamic metrics for wireless mesh networks (WMNs) to improve communication quality are proposed so far. However, all of them have possibility to create temporary routing loops which may cause severe congestion and disruption of communications. In order that WMNs are regarded as a reliable infrastructure of the next generation, such routing loops are strongly desired to be liminated since they...
Endowing mesh routers with multiple radios is a recent solution to improve the performance of wireless mesh networks. The approaches proposed in the literature to solve the problem how to assign channels to radio have mainly focused so far on reducing interference or maximizing the throughput. To the best of our knowledge, none of such approaches attempted to save network resources for the purpose...
Wireless Mesh Networks (WMN) is an essential technology based on mobile ad hoc networks (MANETs). A three sector antenna system applied to WMN was proposed in early 2010, and system performance was analyzed. In this paper, we introduce a real-world three sector antenna system set up in the current WMN test bed in Niigata University, which employs IEEE 802.11 wireless LAN and supports multi-interface...
One of the important challenges that still exist in Wireless Mesh Networks is the capacity reduction due to interference of wireless links. In order to improve throughput of wireless mesh networks each node is equipped with multiple interfaces and can use multiple channels simultaneously. Important issue in these networks is efficient channel assignment so that it minimizes interference. In this paper,...
Multipath routing has been a promising solution to improving reliability and system throughput for wireless mesh networks. However, existing schemes designed for system throughput improvement suffer the route-coupling problem (i.e., the determined multiple paths originating from the same source node typically stay very close to the shortest path to the gateway) so that the improvement ratio may not...
Peer selection strategy is one of the major challenges towards efficient peer-to-peer (P2P) system in wireless mesh networks (WMNs). When peers choose their own utility-maximizing strategies for coalition and peer formation, the solution is always sub-optimal. Peer formation, based on only application layer information, also results in inefficient use of network bandwidth. When multiple recipient-peers...
Single-radio mesh routers operating on a single channel suffer from low throughput due to collisions. Equipping mesh routers with multiple radios operating on non-overlapping channels can significantly improve the throughput. However, the assignment of channels to radios in a multi-radio mesh network is a challenging task. In this paper, we propose a channel assignment algorithm, TICA (Topology-controlled...
Seamless handoff support is an essential issue to ensure continuous communications in wireless mesh networks (WMNs). Due to the existence of multi-hop wireless links, traditional handoff schemes designed for single-hop wireless access networks can hardly guarantee the low handoff latency requirement in WMNs. Existing solutions on reducing the handoff delay in WMNs ignore one important factor for the...
Wireless Mesh Networks (WMNs) have been widely deployed as a new communication paradigm that can provide innovative services for a community (neighborhood, campus, etc.). WMNs are capable to provide both delay-sensitive services such as Voice over Internet Protocol (VoIP) and delay-insensitive services such as peer-to-peer file sharing. Network routing protocols in WMNs often employ the minimum-hops...
Traditional multicast routing algorithms such as shortest path tree (SPT) and minimum Steiner tree (MST) do not consider the wireless broadcast advantage or the underlying channel assignments in a multi-channel multi-radio (MCMR) wireless mesh network (WMN). We propose a multicast routing algorithm for MCMR WMNs that takes into account the above factors in order to minimize the amount of network bandwidth...
In this paper, we present and evaluate a cross-layer protocol that integrates opportunistic routing into a CSMA wireless mesh network. We develop a MAC model and protocol with enhanced spatial reuse that enables spatial efficient anycast transmissions with more realistic assumptions about the carrier sensing capabilities. Using an optimization framework, we derive a cross-layer algorithm that solves...
Spectrum sensing allows the cognitive radio (CR) devices to determine the presence of licensed users in the chosen spectrum band. Though several sensing methods based on energy detection and cyclostationary feature extraction have been proposed, they fail to account for the location-specific results, and provide no incentive for the node to perform sensing at the cost of its own data throughput. In...
The links in an ad hoc or wireless mesh network are normally kept alive by the exchange of beacon-messages between neighboring nodes. These beacons are prone to collisions with traffic from hidden nodes. If several beacons are lost due to overlapping transmissions, the node expecting the beacons erroneously assumes that the link is down. This is called an apparent link-failure. This paper provides...
IEEE 802.16d standard defines WiMAX Mesh mode, which uses Centralized Scheduling (CS), Distributed Scheduling (DS), and co-existence of CS/DS data subframes to allocate resources for data transmissions. The CS and CS/DS schemes are suitable for Internet traffic, but the lack of spatial reuse in over-pessimistic use of CS causes scalability problems and bandwidth limitations. In this paper a Hybrid...
On the basis of interference model, the article puts forward a self-adapting routing strategy of Wireless Mesh Network, which can significantly improve the efficiency of the routing by choosing a minimum interference path. Due to regularly-distributed self-adapting adjustment and load balance, the routing can adapt to the dynamic network environment. The simulation shows that IBAR can significantly...
Intra- and Inter-flow interferences are the principal causes of network utilization degradation in MR-MC (Multi-Radio Multi-Channel) wireless mesh networks. To minimize these interferences, we propose in this paper a channel assignment algorithm and incorporate it in an on-demand routing protocol called the HCARP (Hybrid Channel Assignment Routing Protocol). In addition, HCARP uses load balancing...
This paper discusses the QoS topology control problem with consideration of power control and rate adaptation in wireless mesh networks. Our task is to construct a routing forest (a set of trees rooted from the gateway nodes), configure the transmission power of each node, such that the constructed network topology can meet the delivery threshold for all nodes and the system throughput is maximized...
The Wireless Mesh Network (WMN) has already been recognized as a promising technology as broadband access network from both academic and industry points of view. In order to improve its performance, research has been carried on how to increase the number of simultaneous transmissions in the network while avoiding signal interference among radios. Considering WMNs based upon IEEE 802.11 b/g standards,...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.