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Broadcasting (one-to-all communication) is one of most important and fundamental research problems for information dissemination in all types of networks. In this paper, we mainly focus on the minimum-latency broadcasting in known topology Wireless Mesh Networks (WMNs), in which the network topology and the size is known in advance. It is well known that the computation of a minimum-latency broadcasting...
Wireless Sensor Networks (WSN) based on the IEEE 802.15.4 standard are constantly expanding. Applications like production control, building control are more and more based on WSN because of their energy efficiency, self-organizing capacity and protocol flexibility. The IEEE 802.15.4 standard defines 3 network topologies: the mesh topology, the star topology and the Cluster-Tree topology. However,...
In this paper we find the route discovery medium from wireless networks. Routing a packet from a sender to a receiver in an adhoc wireless sensor network, in which the nodes are open to move arbitrarily and organize themselves. Here we discovered a correct path for transmission of data according to route discovery problem. The main thing of the challenge is that in these types of networks there are...
We analyze the distance-weighted rate achievable in wireless networks that utilize multiple antennas and multi-user links. We give the transport capacity of vector multiple-access channels, and use this network topology at the physical layer of an ad-hoc network to obtain achievable distance-weighted rate regions for a multiple-antenna wireless network. These regions are obtained by considering interfering...
Designing a multi-hop wireless network is a challenge mainly because of high bit error rates and the inherent broadcast nature of the medium creating interference. To improve the capacity, protocols based on spatial reuse of frequencies with multiple orthogonal channels have been introduced. This is particularly useful in complete wireless environments such as wireless mesh networks and wireless sensor...
For control systems the timely and dependable transmission of sensor data to a controlling instance is a necessary precondition to perform the intended control task. Yet the communication infrastructures used for this purpose usually have to work under difficult circumstances in the field, e.g., wireless networks might be lacking energy to successfully transmit data. In order to guarantee the robustness...
We consider the benefits of coding in wireless networks, specifically its role in exploiting the local broadcast property of the wireless medium. We first argue that for unicast, the throughput achieved with network coding is the same as that achieved without any coding. This argument highlights the role of a general max-flow min-cut duality and is more explicit than previous proofs. The maximum throughput...
The capacity of wireless networks is greatly affected by the available information on network states, such as network topology, channel state, and traffic information. Previous research has estimated the capacity of wireless networks by assuming that each node in the network can obtain precise network information. However, in reality, precise network information may not be readily available, and it...
Interference has a significant impact on the network communications; hence efforts have been made to reduce it. Although interference has an unambiguous definition, researchers have different opinions about the interference model. There are mainly two kinds of models. One is based on the number of nodes, and the other is based on the signal strength. However, as discussed in this paper, the former...
In wireless networks, the conventional routing approach is to pre-select the next-hop receiver for a packet based on knowledge of the network topology. However, when the nodes experience fading that changes on the order of the packet duration, a conventional routing approach will often offer poor performance because the pre-selected receiver may not be able to recover the packet because of fading...
We present a formal model for modeling and reasoning about security protocols. Our model extends standard, inductive, trace-based, symbolic approaches with a formalization of physical properties of the environment, namely communication, location, and time. In particular, communication is subject to physical constraints, for example, message transmission takes time determined by the communication medium...
The main objective of this paper is to show new possibilities of wireless communication for mobile robotic and industrial units in the real time. The means of using wireless communication networks based on parallel processing and data transfer for various network topologies are discussed here. We have been focusing our research on ultra low power communication chips based on frequency 2.4 GHz. Furthermore...
The acknowledgment strategy has great potential to increase the TCP throughput when it runs over 802.11 MAC protocol. In particular, TCP acknowledgments carry out an extensive number of medium accesses as they compete in the same route as data packets for media. As the load increases, the well-known hidden terminal effects caused by interference between ACK and data packets in MAC layer can degrade...
Opportunistic routing (OR) schemes, such as ExOR, have been shown to provide significant throughput gains over traditional best-path routing schemes for wireless networks. Though the performance of OR schemes depend on the bit-rate, they currently use a fixed rate for transmitting packets. While several schemes have been proposed for selecting bit-rate for unicast transmission to a single receiver,...
With the growth of the mobile communication technology and the establishment of broadband networks, a transport layer protocol that is suitable for these circumstances is required. Although TCP, developed in wired environments, is a generally used transport layer protocol, it is not appropriate for wireless environments that are error-prone and have high delays. Moreover, previous wired and wireless...
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