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.
Recent research activities on cognitive radio (CR) have mainly focussed on opportunistic spectrum access and spectrum utilization. However, CR technology will have a significant impact on upper layer performance in wireless networks, particularly in mobile ad hoc networks (MANETs). In this paper, we study topology control and routing issues in CR-MANETs and propose a distributed prediction-based cognitive...
Many existing routing protocols for wireless mesh networks (WMNs) are based on minimal hop counts and cannot fit WMNs because they did not take into account congestions in networks. Although other multipath routing protocols use node- or link-disjoint routes, they are still based on minimal hop counts and may even cause extra congestion into networks. This is because a node-disjoint path may contain...
In order to improve the robustness of multicast source tree as well as keep its efficiency in multi-hop wireless ad hoc networks, we present a new multicast protocol, termed Dynamic Source Tree-based Multicast Routing (DSTMR). The keystone of DSTMR is to provide dynamic maintenance for multicast source tree and set up its protective layer during the course of creating multicast source tree. The protective...
Analytic model is proposed to evaluate the packet delay, the delay jitter and the packet loss probability of IEEE 802.11 Distributed Coordination Function (DCF) in multi-hop Ad Hoc Networks. This model can also be easily extended to analyze the Enhanced Distributed Channel Access (EDCA). By modeling each node as a discrete time G/G/1 queue, the closed form expressions of the delay, the delay jitter...
In this paper, we present an analytic model for evaluating the delay, delay jitter and the packet loss probability in multi-hop ad hoc networks using the IEEE 802.11 distributed coordination function (DCF) as MAC protocol. By modeling each node as a discrete time G/G/1 queue, we derive the closed form expressions of the end-to-end delay, delay jitter and the packet loss probability for different circumstances...
Since the wireless medium is a scarce resource, design of efficient medium access control (MAC) protocols with both high throughput and high fairness is significantly important for distributed ad hoc networks. Many current MAC protocols use an exponential backoff mechanism. In that mechanism, a node picks a random backoff time uniformly in an interval that doubles in size after a collision or decreases...
Capacity based topology management is essential for a wireless ad hoc network due to its limited capacity so that topology control becomes indispensable to deploy large wireless ad hoc networks. This paper discusses the impact of topology control on network capacity by introducing a new definition of the expected capacity that is first analyzed in the perspective of cross layer optimization. Based...
In this paper, an energy-efficient multiple paths routing algorithm for wireless sensor network (WSN) is proposed. It consists of three elements: (i) gradients to disseminate data over multiple paths from a source to a sink, (ii) rules to set up disjoint multiple paths, and (iii) policies to select the working path. By limiting the maximum number of the gradients, the exploratory data messages forwarded...
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.