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In this paper, we present new methodology and results for joint routing and link scheduling optimization in multicast wireless ad-hoc networks. The impact of multicast diversity on scheduling is controlled by using topology compression concept quantified through compressed multicast topology matrix. To define topology matrix, first a set of all possible multicast paths, including network coded paths,...
In this paper we introduce a topology control algorithm for increasing transport robustness and efficiency by creating two simultaneous communication paths between the source and destination nodes of a data flow. We make use of a cross-layer substrate that allows us to detect the flows of data in the network while also providing finer control of the routing. Because information of flow traffic in...
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 a wireless sensor network, given a routing tree for data gathering from individual nodes to the sink node, this paper presents a simple, distributed algorithm for assigning time slot to each node for conflict-free communication, such that the maximum latency in data gathering at the sink is minimized. It requires just a one-time computation during the initialisation of the network provided the...
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...
The optimization of the relaying topology in multihop cellular network should provide the answer to the question who is transmitting to whom, and when, in such a way to insure the best system performance. In the case of temporally and spatially varying traffic distribution the optimal topology will also vary in time and an efficient way for topology reconfiguration is needed in order to maximize the...
The optimization of the relaying topology in multihop cellular network should provide the answer to the question who is transmitting to whom, and when, in such a way to insure the best system performance. In the case of temporally and spatially varying traffic distribution the optimal topology will also vary in time and an efficient way for topology control is needed in order to maximize the system...
In this paper, we propose an integer linear programming (ILP for short) based algorithm to solve the electromigration aware wire planning which supports the sufficient wire width for each wire according the current values of all sources and targets in analog circuit. The objective is to minimize the total wiring area in the presence of obstacles. First, we perform the reservation space technique for...
In wireless mesh networks (WMNs), TDMA based link schedulingcan allow multiple concurrent transmissions, resulting in throughput improvements. In this paper, we identify certain link characteristics which reduce achieved spatial reuse and increase schedule length. It is shown that certain links (called loners) based on their length and position, introduce inherent difficulty in scheduling them with...
The Suburban Ad Hoc Network (SAHN) is a cooperative ad hoc wireless mesh network. Nodes are owned and operated by end-users without reliance on central infrastructure. It provides symmetrical bandwidth allowing peer-to-peer services and distributed servers. We minimize the use of scarce unlicensed RF spectrum supported by Smart Antenna technology. RF interference in such networks and techniques and...
In this paper, we consider the problem of topology control by joint power control and routing to maximize the network throughput in wireless mesh networks. First, we present two mathematical formulations of the joint power control and routing problem according to two different definitions of network throughput: the total throughput and the minimal per-node throughput. To reduce the computation cost,...
The measurement of interference intensity is critical to design of network architecture and routing protocol. However, most existing metrics for interference to network routing are based on concrete attack behaviors and error generations, which have restricted their applicable range. In this paper, an impact-oriented metric is proposed for the measurement of interference to network routing. As to...
Endowing mesh routers with multiple radios is a recent solution to improve the performance of wireless mesh networks. The consequent problem to assign channels to radios has been recently investigated and its relation to the routing problem has been revealed. The joint channel assignment and routing problem has been shown to be NP-complete and hence mainly heuristics have been proposed. However, such...
In this paper, we address the routing issue in a wireless mesh network, where each node is stationary and equipped with one or more radios. Specifically, we propose a new path metric called multi-hop effective bandwidth (MHEB), which provides a generic approach to calculate the achievable bandwidth along a path, taking the impacts of inter/intra-flow interference and space/channel diversity into account...
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...
One way to reduce the intercell interference in cellular networks is not to transmit strong signals from the cell borders towards the access points directly but rather to relay such transmissions to other users or relays within the cell by using much lower signal levels. This will produce much less interference in adjacent cells. For this reason, we present an intercell interference aware (IIA) network...
Using multiple radios/channels in wireless mesh networks (WMNs) can significantly boost the throughput of the network and brings broadband wireless access to more users with reduced cost. However, this requires careful assignment of channels to each radio so that interference due to parallel communications can be minimized and the network is not partitioned. We propose a distributed channel assignment...
The interference between wireless communications may cause packet loss and bit error. There are multi-channels in wireless standards such as IEEE802.11b/g, the packet loss rate caused by interference between channels is different. Experiments are done to show the transition feature between channels in IEEE 802.1 lb/g standard. The results show that the traffic throughput depends on the radio frequencies...
In this paper, we address the problem of computing the transport capacity of Wireless Mesh Networks dedicated to Internet access. Routing and transmission scheduling have a major impact on the capacity provided to the clients. A cross-layer optimization of these problems allows the routing to take into account contentions due to radio interferences. We develop exact linear programs and provide an...
There is wide consensus that properly taking into account wireless interference is necessary to design high performance link scheduling algorithms for multi-hop networks. However, most approaches in the literature use simplified models, which significantly abstract from the physical behavior of wireless links. Indeed, the main problem in representing the wireless propagation conditions with a proper...
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