With the explosive growth of mobile data demand, there has been an increasing interest in deploying small cells higher frequency bands underlying conventional homogeneous macrocell network, which is usually referred to as heterogeneous cellular networks, significantly boost overall network capacity. vast amounts spectrum available millimeter wave (mmWave) band, at mmWave frequencies are able provide multi-gigabit access rates, while wireless backhaul band emerging a cost-effective solution...

Due to the uncertainty of transmission opportunities between mobile nodes, delay tolerant networks (DTNs) exploit opportunistic forwarding mechanism. This mechanism requires nodes forward messages in a cooperative and selfish way. However, real word, most exhibit behaviors, such as individual social selfishness. In this paper, we are first investigate how behaviors affect performance DTN multicast. We consider two typical multicast relaying schemes, namely, two-hop epidemic relaying, study...

Due to the uncertainty of transmission opportunities between mobile nodes, routing delay-tolerant networks (DTNs) exploits mechanism opportunistic forwarding. Efficient algorithms and policies for forwarding are crucial maximizing message delivery probability while reducing cost. In this paper, we investigate problem energy-efficient DTNs. First, model dissemination by introducing a continuous-time Markov framework. Based on framework, formulate optimization forwarding, with constraint...

To cope with the uncertainty of transmission opportunities between mobile nodes, Delay Tolerant Networks (DTN) routing exploits opportunistic forwarding mechanism. This mechanism requires nodes to forward messages in a cooperative and altruistic way. However, real world, most exhibit selfish behaviors such as individual social selfishness. In this paper, we investigate problem how selfishness influences performance epidemic DTN. First, model message delivery process two dimensional...

With the rapid growth of demands for mobile data, wireless network faces several challenges, such as lack efficient interconnection among heterogeneous networks, and shortage customized QoS guarantees between services. The fundamental reason these challenges is that radio access (RAN) closed ossified. We propose OpenRAN, an architecture software-defined RAN via virtualization. It achieves complete virtualization programmability vertically, benefits convergence horizontally. provides open,...

Heterogeneous cellular networks (HCNs) are emerging as a promising candidate for the fifth-generation (5G) mobile network. With base stations (BSs) of small cells densely deployed, cost-effective, flexible, and green backhaul solution has become one most urgent critical challenges. vast amounts spectrum available, wireless in millimeter-wave (mmWave) band is able to provide transmission rates several gigabits per second. The mmWave utilizes beamforming achieve directional transmission,...

The trend for dense deployment in future 5G mobile communication networks makes current wired backhaul infeasible owing to the high cost. Millimetre-wave (mm-wave) communication, a promising technique with capability of providing multi-gigabit transmission rate, offers flexible and cost-effective candidate backhauling. By exploiting highly directional antennas, it becomes practical cope explosive traffic demands deal interference problems. Several advancements physical layer technology, such...

Nowadays, human trajectories are widely collected and utilized for scientific research business purpose. However, publishing trajectory data without proper handling might cause severe privacy leakage. A large body of works is dedicated to merging one's with others', so as avoid any individual being re-identified. Yet their solutions do not provide enough protection since they cannot prevent semantic attack, which means the attackers able acquire individual's private information by using...

Previous works have proposed various approaches to implement service chaining by routing traffic through the desired middleboxes according pre-defined policies. However, no matter what scheme is used, performance of depends on where these are placed. Thus, in this paper, we study middlebox placement problem, i.e., given network information and policy specifications, attempt determine optimal locations place so that optimized. The metrics studied paper include end-to-end delay bandwidth...

To cope with the explosive traffic demands and limited capacity provided by current cellular networks, Delay Tolerant Networking (DTN) is used to migrate from networks free high device-to-device networks. The DTN-based mobile data offloading models do not address heterogeneity of are based on simple network assumptions. In this paper, we establish a mathematical framework study problem multiple under realistic assumptions, where 1) heterogeneous in terms size lifetime, 2) users have...

With the increase in emerging bandwidth-intensive applications, millimeter-wave (mmWave) communications 60-GHz band have become a hot topic. There are two unique features that sharply distinguish mmWave wireless personal area networks (WPANs) from other using lower carrier frequencies. First, links use high-gain directional antennas to overcome high propagation loss. Second, easily blocked by human body and furniture. In this paper, we develop blockage robust efficient medium access control...

With the rapid growth of demands for mobile data, wireless network faces several challenges, such as lack efficient interconnection among heterogeneous networks, and shortage customized QoS guarantees between services. The fundamental reason these challenges is that radio access (RAN) closed ossified. We propose OpenRAN, an architecture software-defined RAN via virtualization. It achieves complete virtualization programmability vertically, benefits convergence horizontally. provides open,...

Understanding mobile app usage has become instrumental to service providers optimize their online services. Meanwhile, there is a growing privacy concern that users' may uniquely reveal who they are. In this paper, we seek understand how likely user can be re-identified in the crowd by apps she uses. We systematically quantify uniqueness of via large-scale empirical measurements. By collaborating with major cellular network provider, obtained city-scale anonymized dataset on traffic (1.37...

Well-aligned small-diameter ZnO nanowire arrays have been synthesized on Si wafers pre-coated with c-oriented thin films by a catalyst-free thermal evaporation method. The morphology of the products has found to be greatly affected oxygen flow rate. self-catalyzed VLS mechanism is proposed interpret growth nanowires and change in product morphology. Classical nucleation theory employed analyze process nanowires, Zn vapor supersaturation key factor affect diameter areal density nanowires....

With vast amounts of spectrum available in the millimeter wave (mmWave) band, small cells at mmWave frequencies densely deployed underlying conventional homogeneous macrocell network have gained considerable interest from academia, industry, and standards bodies. Due to high propagation loss higher frequencies, communications are inherently directional, concurrent transmissions (spatial reuse) under low inter-link interference can be enabled significantly improve capacity. On other hand,...

Running multiple virtual networks over a shared physical network is promising way to support diverse applications, consequently virtualization viewed as the keystone of next-generation architecture. However, decoupling role traditional ISPs into Infrastructure Providers (InPs) and Service (SPs), also brings some new challenges us. For example, how fairly efficiently share sacred resources InPs among SPs key problem. The interaction between SPs, such cooperation competition, makes this topic...

Wireless virtualization has been proposed as a promising way to overcome the current plight of wireless network, i.e. spectrum crisis, by enabling multiple concurrent virtual networks running on shared substrate resource. However, making efficient use underlying requires effectively assigning physical resources several networks. Since opportunistic sharing makes communication more intelligent and efficient, we present an based resource allocation scheme for virtualization. First, formulate...

With the explosive growth of mobile demand, small cells in millimeter wave (mmWave) bands underlying macrocell networks have attracted intense interest from both academia and industry. MmWave communications 60 GHz band are able to utilize huge unlicensed bandwidth provide multiple Gbps transmission rates. In this case, device-to-device (D2D) mmWave should be fully exploited due no interference with higher achievable addition, less by directional transmission, links including D2D can...

Due to human blockage and device mobility, 60GHz wireless local-area network (WLAN) faces the challenge of communication-link outage. To cope with this problem, a double-link beam tracking scheme is proposed in paper. This includes search strategy transmission alternative links, an in-packet switching method. The links are simultaneously tracked against through probing neighboring beams; once detected link, system can thus switch link directly. Besides, finds finish quickly tracking, enables...

Delay Tolerant Networks (DTNs) are able to provide communication services in challenged networks where the end-to-end path between source and destination does not exist. In order increase probability of delivery, DTN routing mechanisms may require nodes network store carry messages their local buffer replicate many copies. When limited is consumed, choosing appropriate drop critical maximizing system performance. Current methods for this sub-optimal or assume unrealistic conditions. paper,...

Owing to the uncertainty of transmission opportunities between mobile nodes, routing in delay-tolerant networks (DTNs) exploits mechanism opportunistic forwarding. Energy-efficient algorithms and policies for DTN are crucial maximizing message delivery probability while reducing cost. In this contribution, we investigate problem energy-efficient optimal beaconing control a DTN. We model dissemination under variable rate with continuous-time Markov model. Based on model, then formulate...

Nowadays, human trajectories are widely collected and utilized for scientific research business purpose. However, publishing trajectory data without proper handling might cause severe privacy leakage. A large body of works dedicated to merging one's with others', so as avoid any individual being re-identified. Yet their solutions do not provide enough protection since they cannot prevent semantic attack, which means the attackers able acquire individual's private information by using...