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Virtual network mapping provides a promising way to solve the ossification of current Internet. Mapping multiple virtual topologies onto a shared substrate network is a challenging problem. In this paper, we provide a new virtual network embedding algorithm based on virtual topologies connection feature and introduce a node connection-degree to measure the priority of the alternative physical nodes...
This paper presents a SON enhanced approach for OTD Based Geolocation in a real 3G UMTS Network. The algorithm was implemented using cell, measurement report and drive-test data, the last just for geolocation accuracy determination. It uses a dual convergence approach evolving Node B time reference estimation followed by trilateration, boosting convergence. A motion model Kalman filtering module was...
It is being envisaged that a wide variety of applications can be running on Mobile Cloud Computing (MCC) in the near future. The MCC suggests that the speed and direction of Mobile Terminal (MT) are unpredictable. That easily leads to large service latencies when MT handoff, and even results in the failure of time-critical applications for a long time. To address this issue, we propose a service handoff...
The addressing and networking are amongst the most important issues in order to make the Internet of Things (IoT) concept a reality. In the Radio Frequency IDentification (RFID) based IoT context, the most challenging issue is on the integration of the RFID network into the Internet Protocol (IP) network. The development of the RFID technology, which is driven mainly by the logistic related industries,...
This work proposes a formulation to calculate the transmitter power needed to cover cells of different sizes whilst maintaining the average signal to interference-plus-noise ratio (SINR) constant, and near the maximum, for two long-term evolution (LTE) systems operating over non-contiguous frequency bands, 800 MHz and 2 GHz, with an integrated common radio resource management (iCRRM) entity, in the...
Recent advances of device manufacturing and communication technologies create the basis for an exponential grow of new devices with Internet connection in the next years. This will provide an unprecedented opportunity to create applications and services that go far beyond the mere purpose of each participant, as enabled by the interactions in this so-called Internet of Things (IoT). IoT applications...
This paper presents the followed strategy in the planning, integration and optimization of a group of Home Node Bs (HNBs) in an office environment. Firstly, a brief description of the HNB technology is set, being displayed the necessary characteristics for the operation of a cluster of fern to-cells. Network planning is done through the use of the tool TEMS® Transmitter, used in the field to determine...
This paper presents a summary of a measurement campaign regarding radio propagation characteristics between airplanes based on a usage scenario of unmanned aircraft services (UASs) for disaster recovery. In order to reveal the characteristics air-to-air (A2A) links, the measurement campaign has been conducted in Hawaii, by using two small manned airplanes, through a 20-MHz bandwidth OFDM signal designed...
This paper presents a preliminary measurement result for a wireless relay network using small unmanned aircraft system (UAS). We consider the scenario where the UA circles above around the networks automatically and bridges the signals between ground access points (GAPs) of the distant networks. In particular, the two flight scenario of UAS are assumed in this preliminary measurement. The fading parameters...
OFDM based infrastructure relay station (R), implementing decode-and-forward (DF) relaying, has been included in IMT-Advanced standards, in dual-hop scenarios. Ergodic capacity of such a relay system may be significantly enhanced if ordered subcarrier mapping (SCM) is implemented at R, and, at the same time, bit error rate (BER) performance is improved in this way. However, the level of the achieved...
Along with the rapid evolution of wireless communication standards, it poses great challenges on developing an efficient traffic performance test platform in heterogeneous network (HetNet) based on user-perceived experience. In this paper, we put forward a four-dimensional model theory and implemented the smart-phone based UNOTest platform for this purpose. We further carried on a large scale experiment...
This paper presents a capacity degradation model for sectorized cellular networks with FFR (Fractional Frequency Reuse). A sectorized FFR network (SFN) consists of a super group and a number of sectors. Since a super group in a cell employs the same frequency partition as the other super groups in the neighboring cells, inter-cell interferences may become serious when the radius of the super group...
In TOA based indoor human tracking system, target sensors are often mounted to the surface of human body which may raise non-line-of-sight (NLOS) issues and give raise to significant ranging error. However, analysis on the influence of human body on TOA ranging result has never been seen from previous researches. In this paper, we focus on geometrical information, effect of system bandwidth and signal...
In this paper we propose an enhanced Transmit Power Control (TPC) scheme and a new fractional Carrier Sense Multiple Access with Collision A voidance (F-CSMA/CA) scheme for use in a dense 802.11 network. The new schemes improve the energy normalized Media Access Control Goodput performance in networks with overlapping Basic Service Sets (OBSSs) by mitigating the interference effect using TPC and reducing...
The Internet of Things (IoT) presents itself as one of the basic pillars of the Future Internet. Such an extended network of heterogeneous “things” forms a global network infrastructure supported by several communication protocols where physical and virtual objects are interconnected. It is envisaged that billions of machines will be connected to the Internet, pushing the current communication technologies...
A wireless communication system in TV broadcasting band (470MHz–710MHz) has been developed. In the system its operational channels are set to the radio equipment according to calculation results provided from the white space database (WSDB). By the system, efficient wireless communication environment to accommodate increasing mobile traffic is expected, which consequently loads off traffic of wireless...
Interference alignment (IA) is a promising technique that allows high capacity gains in interfering channels. However to achieve the maximum degrees of freedom it requires the knowledge of the different link channel state information (CSI) between base station (BS) and user terminal (UT). A quantized version of the CSI is feedback from the UT to the BS, which is then used to perform the overall IA...
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