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With the rapid development of converged network technology, the network shows an obvious trend to be heterogeneous. In order to solve this problem, this paper proposes a multi-controller collaborative interconnection architecture for multilayer heterogeneous SDON (Software Defined Optical Network). And to enable this architecture, OpenFlow protocol is extended accordingly. Furthermore, the inter-domain...
Cloud radio access network (C-RAN) centralizes several baseband units to form a pool, which is the primary form of the wireless network virtualization. Some aspects of C-RAN are always developing, such as the processing capacity and multiple radio access technology (multi-RAT) convergence. In this paper, the Not Only Stack (NO Stack) framework, as a virtualization approach, is suggested to be employed...
In the existing Microgrid (MG) market, the technology (MG controller) mainly focuses on operation and management of MG with large size (such as campus/industrial/community etc.) and the generation resources generally involves diesel at least and other renewables (such as PV, wind turbine, Fuel Cell) and storage units. However, MG technology enabling to support a specific critical facility like, for...
In the multiuser cooperative communication, a core problem is how to efficiently find an appropriate cooperative relay node with lower power consumption and minimal payment when the number of relay nodes is large. This is referred to as optimal relay selection problem, which characterize the desired tradeoff between the probing cost for establishing cooperative transmission and the reward via the...
SSL (Secure Sockets Layer) and TLS (Transport Layer Security), which aim to provide confidentiality and integrity of data in transit across untrusted networks, have combined symmetric cryptography technology and public encryption technology. Over the last couple of years, however, several significant vulnerabilities have been discovered in SSL/TLS protocols. The combination way of timing attack and...
Mobile traffic is growing exponentially and various kinds of traffic are emerging. It is hard to support new communication mechanisms in current cellular networks due to their inflexibility. And since link capacities are fairly close to the Shannon limit, further improvements seem to be expensive and will provide limited gains. As a result, people are working on redesigning cellular networks with...
As one of the newest technology, LTE has become increasingly popular after GSM and UMTS. As the LTE industrial chain matures and user requirements grow, E-UTRAN will be deployed on a large scale, covering all urban areas and most other regions. The control plane, which is responsible for connection management, mobility and security, has aroused more and more attention. In order to have an in-depth...
We propose a cooperative spectrum sharing strategy in which the secondary system can access to the licensed spectrum of the primary system if it can help the primary system achieve the target rate. Specifically, the secondary system acts as a decode-and-forward relay for the primary system by splitting a fraction of its transmission bandwidth to help forward primary signal. It uses the remaining bandwidth...
This paper presents an analytical study on the outage performance of cognitive decode-and-forward (DF) two-way relaying networks with underlay spectrum sharing. The bidirectional protocol, i.e., two time-slot multiple access broadcast (MABC) and three time-slot time division broadcast (TDBC), are considered. We propose a definition of outage probability by jointly considering outage events in the...
In this paper, we propose an anti-interference cooperative spectrum sharing strategy in cognitive two-phase full-duplex relaying networks, in which the secondary system acts as a decode-and-forward relay to assist the primary system achieve the target transmission rate. As a reward, the secondary system can gain access to the licensed primary spectrum to transmit its own signal in both two phases...
The current wireless communication network is a content-careless network, in which every request needs a new transmission, even those requests imply the same content. However, the Long-Tail distribution of users' interests caused by the converging behavior, determines that the redundant traffic, which is the re-transmission bearing same content, is rather enormous. Therefore the content-careless scheme...
In the TD-LTE system, because the handover parameters are not reasonable or optimized, the UE performs handover between target and source eNodeBs repeatedly, such as UE executes handover from the cell A to cell B, and then quickly handover from cell B to cell C. In order to avoid this kind of handover failures, this paper proposes an optimized handover process, and elaborates the handover signaling...
Multi-node decode and forward protocol(MNDFP) can be used to improve transmission performance and expand coverage. However, in traditional MNDFP, the number of cooperative nodes(relays) is fixed, regardless of the Channel Quality(CQ). In this paper, we proposed a selective strategy for MNDFP, which can adjust the amount of cooperative nodes adaptively based on the CQ. We give the closed-form expression...
Distortion exponent (DE) is the asymptotic exponential decay rate of the expected distortion between a source and its reconstruction in the high- SNR regime. This paper presents two improvements to the existing DE analyses of two-way relaying networks, where two users communicate in both directions with the help of a relay. First, we allow the users to have different bandwidth ratios, and derive the...
In this paper, we study the end-to-end distortions when transmitting two Gaussian signals in a three-node, half-duplex, and two-way relaying network, where two users communicate in both directions with the help of one relay, and can transmit at different rates. We focus on the two-phase Multiple-Access Broadcast (MABC) cooperation protocol with decode-and-forward (DF), amplify-and-forward (AF), or...
The performance of data acquisition systems has been increasing steadily to cope with the need for continuous improvement in manufacturing floor and machine efficiencies. The Ethernet network has become the most popular network in data acquisition systems to reduce media costs and achieve the higher performance. This paper presents the development of a standard network data acquisition system that...
This paper discusses the realization of Adaptive Traffic Load slotted MACA in cellular based M2M communication. Based on the statistic information of the channel's occupancy rate, the base station estimates the traffic load and calculates the RTS transmission probability and broadcast to the members. By using the ATL S-MACA we control the access of the terminals to the system for high arrival rates...
On the basis of shortage existing in traditional WebGIS, this paper puts forward a novel WebGIS framework based on Ajax, Web Services and SOA. The framework combines Ajax with Web Services. Through invocating Web services asynchronously by Ajax, the problems of poor user experience, system isomeric compatibility, system integration and mutual operation etc. are solved. The conclusion means a great...
In this paper, we study the transmission of Gaussian signals in a three-node half-duplex bidirectional relaying network, where two users communicate in both directions with the help of one relay, and can transmit at different rates. The relay employs amplify-and-forward (AF) or decode-and-forward (DF) based cooperation protocols. We analyze the distortion exponent that characterizes the high signal-to-noise...
In this paper, we study the transmission of a Gaussian signal in a multi-relay cooperative system, where each relay is half-duplex and employs the amplify-and-forward (AF) relaying protocol. We focus on the analysis of the distortion exponent that characterizes the high signal-to-noise ratio (SNR) behavior of the end-to-end distortion of the received signal. Specifically, we investigate the feedback...
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