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The performance of multi-radio multi-channel wireless mesh networks (WMNs) based on the IEEE 802.11 technology depends significantly on how the channels are assigned to the radios and how traffic is routed between the access points and the gateways. In this paper we propose an algorithmic approach to this problem, for which no conclusive solution has been put forward in the literature so far. The...
Cognitive radios are expected to improve the capacity of wireless mesh network dramatically. In this paper, we model the channel heterogeneity, which is a unique feature in cognitive radios, and present a cross-layer design framework which jointly considers the spectrum sharing, scheduling and routing with the objective of minimizing the system total activation time, i.e., maximizing the system capacity...
Mobile ad-hoc networks, such as tactical networks, are frequently implemented using multiple subnets, or tiers, so that nodes in one tier can communicate to nodes in another tier only through gateways that can communicate in two of the tiers. The selection of the gateway nodes affects the robustness and performance of the connected subnets. This paper presents an algorithm for selecting gateways in...
Most WSN routing protocols select route based on hop count. Efficient routing metric should consider both inter-flow and intra-flow interference. A new minimum route-interference routing metric for multi-radio WMN is proposed. The path which has a minimum total interference can be found by using this metric. Simulation result shows that network performance can be significantly improved with the new...
Network topology does not change dynamically in wireless mesh networks. Most of the end-to-end traffic flows are between mesh nodes and gateways. A tree-base routing algorithm is suitable for such network architecture. When using multichannel and multi-interface, routing algorithm and channel assignment is codependent. They should be combined together to fully exploit the network capacity. We propose...
In IEEE 802.11-based wireless mesh networks, routing is crucial in achieving high throughput in face of both interflow and intra-flow interference. Prior work focuses on finding the maximum available bandwidth path when a new flow enters the network. However, few has considered the effect of the new flow on the throughput of the existing flows. We propose a routing framework that uses the topology...
In this study, we consider an optimization problem concerning about how to build a multicast tree to deliver continuous multimedia streams to a large number of mesh clients on the wireless mesh networks simultaneously. In order to provide high-quality streams to users, we need to allocate non-overlapping channels to communication links to avoid interference. Since the number of non-overlapping channels...
In a wireless mesh network, the traffic is aggregated at mesh router and most of them forwarded towards the Internet through GW (Internet gateway). Thus easily leads to a bottleneck for network performance at GW. Aimed to this problem ,we firstly treated the GW and mesh router as the alike node equivalently. Then used the logarithm-normal distribution model of shadow affect in wireless communication...
This paper addresses the problem of scheduling in Wireless Mesh Networks (WMNs). The paper first discusses existing scheduling algorithms and classifies them based on the technique they use and their implementation frameworks.Then detailed discussions of the proposed scheduling method are presented. Simulation experiments are conducted to compare the performance of fair scheduling with the method...
WMNs are low-cost Internet access networks built on cooperative routing over a backbone composed of stationary wireless routers. In hybrid mesh WMNs both client mesh and backbone has ability to forward the data to destination. Many ad hoc routing protocols have been adapted to work in WMN without considering the differences between both technologies. Due to the differences between ad hoc network and...
IEEE 802.11-based backbone mesh networks comprise of static wireless mesh routers (WMRs) which create a wireless multihop backbone to provide high-speed last-mile wireless Internet access to communities. Specialized WMRs called gateways provide the interconnection between the mesh network and fixed IP networks. Mesh routers perform backhaul routing and may additionally serve as access points (APs)...
Since the emergence of ubiquitous computing, evaluating wireless network performances has become one of the major economic issues. Among the existing performance indicators, the network capacity, defined as the maximal amount of flow carried by a topology during a fixed time period, is essential. Some cross-layer characteristics have to be taken into account in order to optimally allocate the common...
Wireless mesh networks (WMNs) support a variety of modulation and coding schemes (MCSs) and hence enable adaptive modulation and coding. On the one hand, adaptive modulation and coding significantly increases the overall system capacity, as it allows to maximize the throughput on each link in dependence of the channel conditions. On the other hand, there is a trade-off between link data rate and spatial...
Hybrid wireless-optical access network (WOAN) is a newly emerged network which integrates passive optical networks (PONs) and wireless mesh neworks(WMNs) to provide the ubiquitous, high bandwidth last mile Internet access. In WOAN, transmission delay for traffic up to the Internet consists of wireless path delay in WMNs and waiting delay at ONUs due to the TDMA schedule. The ONU from which transmission...
Wireless Mesh Networks (WMNs) provide a cost-effective way of deploying a network and providing broadband Internet access. In WMNs a subset of nodes called gateways provide connectivity to the wired infrastructure (typically the Internet). Because traffic volume of WMNs is expected to be high, and due to limited wireless link capacity, gateways are likely to become a potential bottleneck. In this...
In this paper, we address the routing and call scheduling problem in which one has to find a minimum-length schedule of selected links in a TDMA (time division multiple access) based wireless network. As we deal with multi-hop networks, these selected links represent a routing solution (paths) providing enough capacity to achieve the routers requirements of bandwidth. We present a cross-layer formulation...
Cognitive radio (CR) has the potential to substantially improve the system capacity and adaptability of wireless mesh network (WMN). In this paper we investigate the achievable performance gain of cognitive wireless mesh network (CWMN), in which all nodes are equipped with CRs, by jointly optimizing spectrum allocation, routing and time scheduling. The formulated optimization problem aims to minimize...
In multi-hop infrastructure wireless mesh networks (WMNs), the association mechanism, by which a client station (STA) affiliates with a mesh access point (MAP), and the routing algorithm, through which MAPs form a multi-hop backhaul for relaying STAs' traffic, determine a two-tier logical topology. Apparently the STA-MAP association mechanism and the backhaul routing impact the available bandwidth...
This paper studies video multicasting in large scale areas using wireless mesh networks. The focus is on the use of Internet access gateways that allow a choice of alternative routes to avoid potentially lengthy multi-hop wireless paths with low capacity. A set of heuristic-based algorithms are described that together aim to maximize network capacity: the two-tier integrated architecture algorithm,...
A multi-radio Wireless Mesh Network (WMN) is a multi-hop network that consists of mesh routers and mesh clients, where mesh routers are equipped with multiple radio interfaces and form the backbone of the mesh network. To provide backbone support, it is necessary to reduce interference and balance load in Wireless Mesh Networks (WMNs). We propose load-aware routing metric (LARM), which captures the...
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