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.
Wireless interference can make a significant impact on the performance of a wireless network. The paper studies TDMA-based timeslot allocation to schedule links efficiently under RTS/CTS interference model of wireless networks, and presents an efficient centralized timeslot assignment algorithm. In addition, the paper presents an effective heuristic algorithm for calculating end-to-end bandwidth on...
To utilize the available frequency channel space in wireless mesh networks (WMNs), recent work has significantly been focusing on the channel assignment in multi-interface and multi-channel wireless mesh network. This paper presents our design of a distributed channel assignment algorithm that assigns channels based on capacity of the channels. It is shown that the performance of the network is significantly...
The capacity of wireless ad hoc networks can be increased by using multiple radio channels. But due to interference the capacity is still not fully utilized. This is caused by the limited number of available radio channels. The interference problem can be reduced using directional beams instead of omni-directional beams. This paper presents a novel cross-layer approach to use multiple radio channels...
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...
This paper studied and analyzed expected throughput metric (ETP), found out that it made a conservative estimate for long path, and it didn't take into account the impact of node's loading on the performance of path. In view to the problem, this paper assumed the interference range of links as two hops, and proposed the definition of node's loading in wireless mesh network, and combined the two with...
The performance of wireless mesh networks is severely limited by the interfering nature of wireless transmissions. In an 802.11 network, collisions can be aggravated by the hidden terminal problem. In order to solve the hidden terminal problem, virtual carrier sensing using RTS/CTS has been proposed as a solution. However, this mechanism potentially aggravates the exposed terminal problem which can...
Wireless interference can make a significant impact on the performance of a wireless network. The paper studies TDMA-based timeslot allocation to schedule links efficiently under RTS/CTS interference model of wireless networks, and presents an efficient distributed timeslot assignment algorithm. In addition, the paper presents an effective heuristic algorithm for calculating end-to-end bandwidth on...
In this paper, we investigate the power allocation problem involving how to multiplex cooperative routes in multi-source ad hoc wireless networks. The aim is to provide a route-multiplexing scheme with minimal total power consumption given spectrum efficiency constraints. Three protocols: full combination with interference (FCI), full combination with time sharing (FCTS) and selection between interference...
We consider the problem of joint routing, scheduling and power control in multi-hop wireless networks. We use a linear relation between link capacity and signal to interference noise ratio in our formulation. In a previous work, using a duality approach, the optimal link scheduling and power control that minimizes the total average transmission power is found. We formulate this problem as a linear...
In this paper, we study QoS routing in wireless mesh networks with cognitive radios, which involves route selection, channel allocation and scheduling. It turns out to be a hard problem because of the impact of interference and channel heterogeneity. We formally model it as an optimization problem and present an integer linear programming (ILP) formulation to provide optimal solutions. We then present...
We explore radio resource allocation in wireless mesh networks, namely we study how to determine a space- and time-division pattern of transmissions, to deliver traffic to gateway nodes. We highlight link scheduling and routing issues, which we investigate in a cross-layer framework. To this end, an integer linear program is presented, where diverse constraints affect resource allocation; in particular,...
The WiMAX mesh networks based on IEEE 802.16 standard is a key topology for the next generation wireless networking. However, interferences from transmission of the neighboring nodes within the mesh networks are inevitable. Cross-layer design for tree-type routing and level-based centralized scheduling is proposed as the optimization strategy. The cross-layer design here is relying on the routing...
The capacity of a wireless network depends on the interference encountered by flows in the network as they traverse their routes from source to destination. Link-transmissions along a route must be scheduled so as to avoid interference with other links, while the interference-pattern that scheduling has to accommodate itself depends on the routes selected for traffic flow. Therefore, for efficient...
A random routing scheme is proposed for mobile ad-hoc networks of non-real-time services. When packet transmission takes place, the intermediate relay nodes between the source node and the destination node are not known a priori. Through network control signaling, the relay nodes are determined by estimating the physical layer parameters, specifically the link quality between the source and the possible...
Wireless multi-hop network is a kind of multi-hop broadband distributed wireless network with high capacity and high transmission rate. One of the major problems of wireless networks is the capacity reduction due to the interference among multiple simultaneous transmissions. In order to effectively minimize the effect of interference, this paper presents a new routing metric called WLQM which considers...
Wireless mesh networks, mobile ad-hoc networks and wireless sensor networks are some of the names related to a more general concept that can be described as wireless multihop networks. The topic of the tutorial is motivated for the feeling of lack of connection between reality and theory in the study of this kind of networks. The tutorial starts with an introduction to some applications and the technologies...
In this paper we investigate the reliability of multipath routing using multiple gateways in a wireless mesh network. We propose a greedy gateway placement algorithm that tries to minimise the number of gateways needed when a maximum distance between each node and a predefine number of gateways is guaranteed. Simulations results show that our intelligent gateways placement can be employed to complement...
This paper presents the expected link performance (ELP) metric for finding high throughput, low delay paths in 802.11 mesh networks. ELP combines three different mechanisms to accurately determine the expected link performance. Link quality information is combined with cross-layered link interference estimation to select optimal paths. Simulation results show that ELP significantly outperforms both...
The IEEE 802.16 standard defines WiMax (worldwide interoperability for microwave access) mesh network, using the base station (BS) as a coordinator for centralized scheduling. This paper proposes a centralized scheduling algorithm by constructing routing tree in WiMax mesh network, which introduces the cross-layer concept between the media access controller (MAC) and the network layers. The interference,...
Directional antennas in sensor networks are receiving increasing interest and research due to the potential to increase throughput and reduce delay and interference, while requiring lower transmission power. Considering the stringent operation requirements (low duty-cycle) as MAC congestion problems in large multi-hop networks, WSN performance can benefit enormously from such directional capabilities...
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.