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Parameter optimization such as power and time allocation plays an important role in emerging cooperative relaying protocol designs, especially when the environment is congested and contested. However, most existing works on cooperative relaying protocol designs considered equal-time allocation scenario, i.e. equal time duration is assigned to each source and each relay. In our recent work, we developed...
The design of a cooperative protocol relying on both cooperative relaying and jamming in order to provide security at the physical layer of wireless communications is considered in this paper. We suppose that pair of nodes is assisted by a number of helpers in their communication, which either relay information or cause harmful interference to an eavesdropper, at both stages of the relaying protocol...
This conference note describes a real-time tactical mobile network optimization agent (TNOA) utilizing real-time simulation. By modeling the wired and wireless links in near real time using the massively parallel, high performance network simulator QUALNET we optimize system performance via configuration control. Our heterogeneous tactical network consists of Link 16, Link 11, S-Tadil-J, and JREAP...
We consider distributed optimization over orthogonal collision channels in spatial multi-channel ALOHA networks. Users are spatially distributed and each user is in the interference range of a few other users. Each user is allowed to transmit over a subset of the shared channels with a certain attempt probability. We study both the non-cooperative and cooperative settings. In the former, the goal...
Optimal resource allocation for cooperative amplify and forward and decode & forward wireless relay networks in which multiple source to destination pairs are assisted by relays is investigated here. Power and bandwidth are the resources which are allocated to sources and relays in the centrally controlled network by the access point or base station. The issue of resource allocation is very stringent...
We consider the problem of distributed throughput maximization for multi-channel ALOHA networks. We focus on networks containing a large number of users that transmit over a low number of channels. First, we consider the problem of constrained distributed rate maximization, where user rates are subject to total transmission probability constraints. We propose a distributed best-response algorithm...
Signaling is the premise of communication. Signaling analysis is an effective means of network optimization, and it has many applications in the 3G communications. TD-SCDMA specially services for the 3G communications of China. With the research and development of TD, its versatility and scalability draw the world's attention. Yet the analysis of TD-SCDMA in Iub interface is rare. This paper deeply...
When attempting to deliver contents over wireless networks in an efficient manner, the different protocols involved must deal with several sources of loss such as congestion and channel errors, which can prevent an effective message reception at the destination. Therefore, content delivery protocols must deal with these problems in the most appropriate way. In this paper we focus on the design, implementation,...
The increasing complexity of the future wireless networks leads to the requirement for self-organization. This is true especially in home networking where users are typically not networking professionals and cannot be expected to perform complex optimization and management tasks. In this context, cognitive radio concept combining cross-layer optimization and learning mechanisms is a promising solution...
A framework for the joint design of wireless network and controllers is proposed. Multiple control systems are considered where the sensor measurements are transmitted to the controller over the IEEE 802.15.4 protocol. The essential issues of wireless networked control systems (NCSs) are investigated to provide an abstraction of the wireless network for a co-design approach. We first present an analytical...
Power saving is an important issue in wireless networks. This paper proposed an energy-efficient cooperative relay selection scheme that utilized the transmission power more efficiently in cooperative relaying systems. The nodes in the network were deployed with multiple antennas and the decode-and-forward relaying protocol was used. The optimization problem of energy efficiency in cooperative relaying...
In this paper we devise efficient optimization techniques to find optimal routing and scheduling policies for wireless ad hoc networks in the presence of multi-user interference and cooperative transmissions. Our focus is to assess the impact of interference among distinct data flows on optimal routing paths and related transmission schedules. In our reference scenario, all nodes have a single antenna...
Today's platforms offer ubiquitous network connectivity through one or more communication interfaces and while the communication devices consume a small portion of the overall platform power the impact of network connectivity and individual packet processing on the overall platform energy consumption is significant, due to the non-deterministic characteristics of network traffic. In this paper, we...
With the development of communication technologies, various multi-media applications have been introduced into wireless and satellite networks. However, as wireless channels and satellite channels are not ideal and the traditional layering design method has its deficiencies, another network design method - cross-layer design has attracted more attention in recent years. In this article, the origin...
Network-wide broadcast has been extensively studied. In this paper, we introduce the problem of all-to- one-hop broadcast. Specifically, we are interested in the required time slots within which all nodes can receive unit-size messages from all one-hop neighbors and aim to minimize the broadcast latency. To this end, we decompose the optimal broadcast latency problem into two methodical sub-problems...
In wireless and mobile networking, volatile environmental conditions are a permanent challenge, resulting in a demand for cross-layer optimizations. To further increase flexibility, we believe cross-layer architectures should adapt themselves to these changing conditions, just as they adapt the network stack, devices, and applications. In this paper, we propose CRAWLER, a novel cross-layer architecture...
Utility companies are under pressure to reduce their own operating costs and support energy savings, while providing more services to their customers. These new services will be expected to include better information for customers to help them make decisions about energy use and optimizing current energy availability. This paper describes the use of Advanced Metering Infrastructure (AMI) as a way...
Research on wireless sensor networks (WSN) has received considerable attention in the last few years due to their unique characteristics, including, flexibility, self-organization, easy deployment, which make them an ideal candidate for low-cost monitoring. In order to help WSN planning and to enable the design of new protocols and applications and assess their performance, several existent simulation...
Wireless networks will certainly run applications with strict QoS requirements and so, micro-mobility protocols such as fast hierarchical mobile IPv6 (FHMIP) are useful tools to accomplish this new feature. The FHMIP is an effective scheme to reduce Mobile IPv6 handover disruption, however it does not support application's QoS requirements. Therefore, in order to provide QoS guarantees for real-time...
Cognitive wireless networks are potential and competitive candidates for future self-configuring, self-optimizing and self-healing heterogeneous networks. This paper presents an architecture for future cognitive heterogeneous networks by introducing intelligent nodes. We further elaborate on the fundamental and implementation challenges which need to be solved to make cognitive heterogeneous networks...
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