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In an augmented information (Agi) service, users consume information that results from the execution of a chain of service functions that process source information to create real-time augmented value. Applications may include real-time analysis of remote sensing data, real-time computer vision, personalized video streaming, and augmented reality, among others. We consider the problem of optimal distribution...
This paper focuses on the security issue in Cyber-Physical Systems. The sensor transmits the state estimation information to the remote controller via wireless networks. Due to the broadcast characteristics of wireless communication, the systems are vulnerable to the eavesdropping attacks and jamming attacks. In this paper, we study how to maximize the secure transmission rate between sensors and...
Aiming at dynamic changes of network topology, high real-time security services and high network load in VANETs, this paper proposes an adaptive TDMA slot allocation strategy based on beacon messages (BMA strategy). BMA strategy makes full use of neighbor nodes' beacon messages, including vehicular direction, position, velocity, etc. Meanwhile, each vehicle establishes neighbor table containing beacon...
As Internet of Things (IoT) and smart devices are becoming widespread, expectations for large-scale ad-hoc networks are increasing. To accommodate a large number of nodes, ad-hoc networks should use multiple channels. Thus, dynamic channel switching methods in multi-channel ad-hoc networks have been investigated to control congestion of the channel. However, such channel switching has a considerable...
Current large-scale computing services, such as online social networking and web searching, make the wired links in the data centers with an Ethernet infrastructure oversubscribed. Therefore, researchers consider to augment the data centers with wireless communication, called a hybrid data center network (HDCN), to improve the communication flexibility and network capacity. In this paper, we investigate...
Wireless networks are replacing cables not only when providing Internet access, but also in such scenarios as multimedia transmission and high performance computing, which require extremely high data rates. Although millimetre waves open the door for multigigabit communications at the PHY layer, these rates do not guarantee an adequate Quality of Service (QoS) at the application layer. In order to...
WMNs (Wireless mesh networks) have evolved as a leading technology for next-generation wireless networks. The benefits of WMNs over other wireless technologies have enhanced its multi-facet growth and stimulated a variety of applications. However, there exist several issues in the WMNs, power control being one. In order to offer a detail perspective of the proficient power control in WMNs, this paper...
Path capacity estimation is used for e.g admission control decisions and rate adaptation. This has resulted in a variety of proposed techniques, mostly for the wired domain. In this paper, we evaluate the accuracy of one packet-pair estimator in a wireless test-bed. We study the performance of the estimator when it is configured to be low-intrusive and also gain experience with its use on different...
Cognitive radio ad hoc networks (CRAHNs) inherit the challenges of both cognitive radio technology and wireless ad hoc networks. In this paper, we investigate the problems of secondary users' network lifetime maximization and interference to primary user (PU) minimization jointly in BER constrained stationary cognitive radio ad hoc networks. To solve the problem a cross layer approach is adopted....
Ad-hoc network is an infrastructure less network. In Ad-hoc networks nodes are free to move from and to the network. Therefore the network leads to zero configuration. A protocol is needed to design and implement ad-hoc network. Resource advertisement (RA) is important task in every network. For fast discovery of resource in a network, their management, minimum energy consumption and their distribution...
At present, single network and technology could be impotent when facing: 1) the rocketing proliferation of mobile devices; and 2) the heterogeneity of data services and users' contexts. Therefore, offloading some specific traffic to other networks is a natural yet effective solution. To this end, this paper engineers the cellular offloading oriented vehicular ad hoc networks (VANETs), which concentrate...
Community Cloud computing is a new trend on cloud computing that aims to build service infrastructures upon Wireless Community Networks taking advantage of underused community physical resources. Service allocation protocols are a key design challenge that all cloud systems must properly address to optimize resource utilization. They are specially important when cloud services require a Quality of...
We propose a credit-based resource allocation technique for wireless systems with dynamic spectrum access (DSA) capability, such as multichannel wireless sensor networks. The proposed technique is robust against selfish and malicious behaviors by achieving high performance independently of what users choose to pursue as their objectives. It also improves fairness by ensuring that different users are...
In cellular networks, Device-to-Device (D2D) links can be utilized for data dissemination via unicast or/and multicast within a cluster. For traditional D2D relay schemes, D2D links with poor channel conditions may be the bottleneck and result in conservative resource utilization. Therefore, we suggest preferentially selecting the good quality D2D links with high achievable data rates, which induces...
We address the problem of multiuser power and bandwidth allocation for Orthogonal Frequency Division Multiple Access (OFDMA) networks employing a Type-II Hybrid Automatic Repeat reQuest (HARQ) mechanism, practical Coding and Modulation Schemes (MCSs) and Bit Interleaved Coded Modulation (BICM). The problem is formulated as minimizing the sum power required to satisfy a goodput constraint for each...
In this paper, we consider relay selection technique in a cooperative cellular network where user terminals act as relays to help the communications between a base station (BS) and cell-edge users (CEUs). We firstly build cooperative sets for source mobile users according to their transmission radius. Then, transmission power sets are built for all mobile users according to SNR thresholds. Finally,...
We consider wireless caches placed in the plane according to a homogeneous Poisson process. A data file is stored at the caches, which have limited storage capabilities. Clients can contact the caches to retrieve the data. The caches store the data according to one of the two data allocation strategies: partitioning & coding. We consider the Pareto front of the expected deployment cost of the...
This paper proposes an advanced distributed resource allocation scheme for device-to-device (D2D) communication using loose network-assistance, namely distributed interference channel based resource allocation (DICRA). The MAC/PHY protocol of the proposed DICRA is described and the performance advantage over FlashLinQ is confirmed from computer simulation results.
Energy consumption is a key issue in wireless ad hoc and sensor networks. Cooperative communication represents a potential candidate to improve the energy efficiency of wireless networks and this efficiency can be further improved by considering the variable packet size. In this paper, we address the question of the optimal packet size for data that improves the efficiency of energy consumption in...
This paper proposes a method to prolong the lifetime of event-driven wireless video sensor networks. The proposed method provides the operating point of each node by firstly selecting the route to the sink node in an energy-aware fashion. Then it finds the lifetime-maximal encoding bit-rate utilizing the event statistics and the analytic power consumption models of major functional blocks in the target...
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