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The relevance of the provision of QoS is taken into account in the definition of the new network technologies like for example advanced switching (AS). AS is a new fabric- interconnect technology that further enhances the capabilities of PCI Express, which is the next PCI generation. In this paper we discuss the aspects that must be considered for implementing a specific mechanism for the AS minimum...
Routing is the foremost issue in mobile ad hoc networks (MANETs). In a wireless environment characterized by small bandwidth and limited computational resources, position-based routing is attractive because it requires little communication and storage overhead. To guarantee delivery and improve performance, most position-based routing protocols, e.g. GFG, forward a message in greedy mode until the...
Communication, especially voice communication, continues to play an ever central role in improving business efficiency, customer service, and worker productivity. Technologies such as SIP and Web Services are transforming communication applications by providing primitives that can be integrated into business process flows. Meanwhile, enterprises present dynamic complex environments with strict requirements...
We consider the distributed parameter estimation in wireless sensor networks where a total bit rate constraint is imposed. There is a tradeoff between the number of active sensors and the quantization bit rate for each active sensor to minimize the estimation mean square error (MSE). We first present an optimal distributed estimation algorithm for homogeneous sensor networks and introduce a concept...
The IEEE 802.11e standard defines the enhanced distributed coordination function (EDCF) to improve the quality of service (QoS) in a wireless local area network (WLAN). The EDCF is a CSMA/CA based protocol, where stations compete for the medium with prioritized contention parameters. Also defined in the 802.11e standard is the polling mode of the hybrid coordination function (HCF - polling), which...
With the increasing network speed over Ethernet, the servers and communication systems has become burdened with the large amount of TCP/IP processing required. The main reason for the CPU bottleneck is the TCP/IP stack being processing at a rate less than network speed. In recent years, TCP/IP offload engine (TOE) is emerging as an attractive solution, which can reduce the host CPU overhead and improve...
This paper considers the problem of constructing data gathering trees in a wireless sensor network for a group of sensor nodes to send collected information to a single sink node. Sensors form application-directed groups and the sink node communicates with the group members, called source nodes, to gather the desired data using a multicast tree rooted at the sink node. The data gathering tree contains...
We report measured performance of 802.11a wireless links from an unmanned aerial vehicle (UAV) to ground stations. In a set of field experiments, we record the received signal strength indicator (RSSI) and measure the raw link-layer throughput for various antenna orientations, communication distances and ground-station elevations. By comparing the performance of 32 simultaneous pairs of UAV and ground...
In the past few years, several DHT-based abstractions for peer-to-peer systems have been proposed. The main characteristic is to associate nodes (peers) with objects (keys) and to construct distributed routing structures to support efficient location. These approaches partially consider the load problem by balancing storage of objects without, however, considering lookup traffic. In this paper we...
We discuss several efficient schemes for assigning symmetric keys in a network of small computers (e. g. an ad-hoc or sensor network) such that any two adjacent computers in the network can communicate securely using the keys assigned to both of them. The schemes are efficient because they require that each computer be assigned O(log d) symmetric keys, where d is the network degree, instead of O(d)...
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