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To support voice calls vital to mobile users and carriers, 4G LTE cellular networks adopt two solutions: VoLTE (Voice Over LTE) and CSFB (Circuit-Switched FallBack). In this paper, we disclose that both schemes are harmful to mobile users from a security perspective. The adoption of the latest VoLTE allows an attacker to manipulate the radio resource states of the victim's device in a silent call...
Now the challenge for the mobile network in reliability is more and more serious. The traditional mobile network management schemes such as Mobile IPv6 (MIPv6) and Proxy Mobile IPv6 (PMIPv6) have hardly taken this issue into account. In this paper, we make an improvement based on PMIPv6 to propose a network based reliable mobility management scheme called R-PMIPv6. The basic idea of R-PMIPv6 is to...
This paper considers a millimeter wave (mmWave) system that enables multi-Gbps wireless service for high speed trains. MmWave systems require proper beam alignment to achieve good performance making it difficult to apply to high speed trains due to the need for frequent realignment. In this paper, using the IEEE 802.11ad system parameters, we first show that the channel coherence time will not be...
This paper presents a software defined networking (SDN) based semi-distributed mobility management system. By both using an SDN approach and leveraging layer 2 technology, i.e., carrier grade Ethernet and the 802.1ad standard, it is possible to simplify the network architecture by removing the need for the relatively complex GPRS tunneling protocol currently in use in the user plane. An analytical...
Cell breathing is a mechanism used in cellular networks since many years, which is now proposed for energy efficient purposes. By using this technique, it is possible to save energy during low traffic periods by switching unnecessary BSs off whereas the cell topology is re-adapted supported on some few BSs active. In this article, we analyze a multi-size approach which provide means for an enhanced...
Future cellular networks will be owned by multiple parties, e.g., two mobile operators, each of which controls some elements of the access and backhaul infrastructure. In this context, it is important that as much traffic as possible is processed by the same party that generates it, i.e., that the coupling between traffic and network ownership is maximized. Software-defined backhaul networks can attain...
With device-to-device (D2D) communications, a user terminal(UT) can naturally be used as a relay node (RN) and thus inherently support multi-hop transmission. Thus, cell-edge or deeply faded users can obtain a more uniform connectivity experience. In this paper, we investigate mobile association for the UT with the capability of D2D communications in heterogeneous networks (HetNets). We will develop...
Mobile systems such as smartphones and tablets are re-adopting swapping -- a mature but by rarely used OS feature -- to extend memory capacity without adding more DRAM, especially low-end devices. This resurgence of swapping in mobile systems has inspired both traditional "off-the-rack" schemes and new approaches based on compression and new hardware. Their vastly different designs, however,...
In this paper, we study the energy consumption in heterogeneous networks (HetNets). HetNets are known to be one of the main characteristics of the future 5G networks. In this work we aim to minimize the global energy consumed within these networks by adapting the network density to the operating traffic load. We formulate this problem by expressing the energy gain (i.e., the energy saved) which should...
Cognitive radio networks (CRNs) are expected to improve spectrum utilization significantly by allowing secondary users (SUs) to opportunistically access the licensed spectrum of primary users (PUs). In a CRN scenario consisting of multiple heterogeneously integrated CRNs, the SUs with multiple interfaces may have to conduct spectrum handoff to target subchannels. Jointly considering the interruption...
We consider the problem of joint dissemination of multiple contents with different priorities through epidemic routing in a large Delay Tolerant Network (DTN). Specifically, we consider two files a and b to be distributed in a large capacity-limited DTN through opportunistic contacts between the roaming nodes. The goal is to maximize the number of nodes that receive the files within a delay window,...
An SDN enabled mobile access network is a future network with great potential to support scalable and flexible network applications. To support various network applications, the SDN-enabled mobile access network usually uses forwarding rules in SDN devices. With a limited rule space in existing SDN devices, a rule caching mechanism is an efficient way to improve network performance. In this article...
Mobile devices execute applications with diverse compute and performance demands. This paper proposes a general purpose processor that adapts the underlying hardware to a given workload. Existing mobile processors need to utilize more complex heterogeneous substrates to deliver the demanded performance. They incorporate different cores and specialized accelerators. On the contrary, our processor utilizes...
When a multi-antenna (MIMO) base-station operates in full-duplex mode, multiple uplink and downlink streams can be supported simultaneously in the same frequency band. However, the inter-mobile interference from uplink streams to the downlink streams can limit the system performance. In this paper, we first characterize the degrees-of-freedom of a multiuser MIMO (MU-MIMO) full-duplex network with...
Every management system is trying to make automatic, portable and remote control. This work presents a novel smart energy meter for an automatic and superior metering and billing system. The integration of the Arduino and GSM Short Message Service (SMS) provide the meter reading system with some automatic functions that are predefined. Firstly, we have simulated the project in PROTEUS 8.0 then successfully...
The huge diffusion of mobile devices is rapidly changing the way multimedia content is consumed. Mobile devices are often used as a second screen, providing complementary information on the content shown on the primary screen, as different camera angles in case of a sport event. The introduction of multiple camera angles poses many challenges with respect to guaranteeing a high Quality of Experience...
The widespread usage of second screens, in combination with mobile video streaming technologies like HTTP Adaptive Streaming (HAS), enable new means for taking end-users' Quality of Experience (QoE) to the next level. For sports events, these technological evolutions can, for example, enhance the overall engagement of remote fans or give them more control over the content. In this paper, we consider...
Delay Tolerant Networks (DTNs) have gained importance in the recent past, as cost-effective alternative, in scenarios where delays can be accommodated. They work well in discretely connected network, where there is no direct connectivity between some/all components of the system. But the mobility of nodes creates occasional contact opportunities. The randomly moving nodes cooperate to help a fixed...
Faced by the large number of deployed Wifi Access Points (AP), many research efforts focus on energy savings in Wireless Local Networks. One of the most promising solutions for improving energy efficiency is the Sleep Mode approach, which is especially effective in dense deployments. It is based on switching off the APs while they are not in use, in order to avoid unnecessary energy consumption. In...
This paper addresses an optimal formation control of multiple two-wheeled mobile vehicles with the help of model predictive control. An optimal formation is automatically determined among pre-defined formations in real time according to the environment with the help of model predictive control. Experimental results are demonstrated to verify the effectiveness of the proposed approach.
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