As the number of Access Points and stations sharing the unlicensed ISM (Industrial Scientific Medical) bands increases, interference diminishes the theoretical performance of 802.11 standard. This paper presents results of the performance of an IEEE 802.11b/g network in a public facility infrastructure which needed to deploy more than a thousand access points to provide an IIoT (Industrial Internet of the Things) item location service. As a first step to better analyze such network characteristics, this work studies the channel occupancy, the RSSI (Received Signal Strength Indicator) variation and the throughput of a static and mobile station. The study also analyzes the performance of Voice over IP over the wireless network. The results reveal the inefficient use of the wireless medium in a large 802.11 network due to multiple
radio propagation conditions.
Timing points used in running races and other competition events are generally based on radio-frequency identification (RFID) technology. Athletes' times are calculated via passive RFID tags and reader kits. Specifically, the reader infrastructure needed is complex and requires the deployment of a mat or ramps which hide the receiver antennae under them. Moreover, with the employed tags, it is not possible to transmit additional and dynamic information such as pulse or oximetry monitoring, alarms, etc. In this proposal, we present a system based on Bluetooth Low Energy which allows complete real-time position monitoring of the users using mobile phones on the organizer side and BLE sensors on the participants’ side. Along with the proposal, we present a complete architecture and an extensive analysis of metrics which are determinant for evaluating the performance of the proposed system: detection probability, range, mobility patterns of runners in real races, detection delay, packet collision, energy consumption, performance under high sensor density, etc. All these results, obtained through both experimental measurements and computer simulation, will demonstrate the viability and benefits of the system against other alternatives for the intended application.
The device discovery process is one of the most crucial aspects in real deployments of sensor networks. Recently, several works have analyzed the topic of Bluetooth Low Energy (BLE) device discovery through analytical or simulation models limited to version 4.x. Non-connectable and non-scannable undirected advertising has been shown to be a reliable alternative for discovering a high number of devices in a relatively short time period. However, new features of Bluetooth 5.0 allow us to define a variant on the device discovery process, based on BLE scannable undirected advertising events, which results in higher discovering capacities and also lower power consumption. In order to characterize this new device discovery process, we experimentally model the real device behavior of BLE scannable undirected advertising events. Non-detection packet probability, discovery probability, and discovery latency for a varying number of devices and parameters are compared by simulations and experimental measurements. We demonstrate that our proposal outperforms previous works, diminishing the discovery time and increasing the potential user device density. A mathematical model is also developed in order to easily obtain a measure of the potential capacity in high density scenarios.
The purpose of this paper is to evaluate from a real perspective the performance of Bluetooth Low Energy (BLE) as a technology that enables fast and reliable discovery of a large number of users/devices in a short period of time. The BLE standard specifies a wide range of configurable parameter values that determine the discovery process and need to be set according to the particular application requirements. Many previous works have been addressed to investigate the discovery process through analytical and simulation models, according to the ideal specification of the standard. However, measurements show that additional scanning gaps appear in the scanning process, which reduce the discovery capabilities. These gaps have been identified in all of the analyzed devices and respond to both regular patterns and variable events associated with the decoding process. We have demonstrated that these non-idealities, which are not taken into account in other studies, have a severe impact on the discovery process performance. Extensive performance evaluation for a varying number of devices and feasible parameter combinations has been done by comparing simulations and experimental measurements. This work also includes a simple mathematical model that closely matches both the standard implementation and the different chipset peculiarities for any possible parameter value specified in the standard and for any number of simultaneous advertising devices under scanner coverage.
This paper is an introduction of the main research activities in which the Wireless Communications and Technologies research group (WiComTec-UPC) is involved now or has planned for the next years, oriented to disseminate and facilitate a better knowledge of the capabilities of the group that could promote joint research activity with other IRACON members. Specifically it will be oriented to 5G networks and
optimization through SON, WSN and IoT.
This work is part of a project where the goals
are: designing energetically-optimum domestic WiFi routers;
obtaining real and accurate power consumed models as a function
of router configuration, and providing the community with
an active power waveforms database, useful for considering
power consumption as a part of WiFi networks design and
In particular, in this paper we started by measuring the
active power consumption of a standard router under several
scenarios. These take into account physical transmission rates,
operation modes (transmitting/receiving), transmission powers,
compatibility modes, type of traffic, packet sizes, encryption,
ethernet connections, ...
The paper reports the setup, measurement method, the
first results and conclusions where the impact of the AC/DC
converter on the power consumed is also considered.
It is very common to rule out Bluetooth as a suitable technology for vehicular communications. The reasons behind this decision usually result from misconceptions such as accepting that Bluetooth has a short application range, or assuming its connection setup is not fast enough to allow communication which involves high speed moving nodes. This paper refutes those assertions and proposes the use of Bluetooth not only for Infrastructure-to-Vehicle (I2V) or Road-to-Vehicle (R2V) communications, but also for Vehicle-to-Vehicle (V2V) or Vehicle-to-Infrastructure (V2I) communications. This novel proposal is based on using the remote name request procedure of the standard, combined with an adjustment and optimization of the parameters present in the inquiry and page procedures. The proposed modifications reduce the information exchange delay, thus making Bluetooth a suitable technology for high-speed vehicle communications. The feasibility of the proposed scheme has been validated through experimental tests conducted in different scenarios: laboratory, a real highway and a racing test circuit. There, the communication system was installed in a vehicle circulating at speeds of up to 250 km/h, whereas autonomous devices were disseminated throughout the road path to communicate with the on board devices obtaining satisfying results.
This survey aims to encourage the multidisciplinary communities to join forces for innovation in the mobile health monitoring area. Specifically, multidisciplinary innovations in medical emergency scenarios can have a significant impact on the effectiveness and quality of the procedures and practices in the delivery of medical care. Wireless body sensor networks (WBSNs) are a promising technology capable of improving the existing practices in condition assessment and care delivery for a patient in a medical emergency. This technology can also facilitate the early interventions of a specialist physician during the pre-hospital period. WBSNs make possible these early interventions by establishing remote communication links with video/audio support and by providing medical information such as vital signs, electrocardiograms, etc. in real time. This survey focuses on relevant issues needed to understand how to setup a WBSN for medical emergencies. These issues are: monitoring vital signs and video transmission, energy efficient protocols, scheduling, optimization and energy consumption on a WBSN.
The Help4Mood EU FP7 project (H4M)  proposes to significantly advance the state-ofthe-art in computerized support for people with Major Depression by monitoring mood, physical activity and voice characteristics while promoting activities in reaction to examined inputs. Employing actigraphy can provide supplementary data about patients with depression. Nonetheless, its use is not standardized and there is a lack of public analyses about treated patients with depression using this technique, which is the objective of the project. The purpose of the Personal Monitoring System (PMS) used in H4M is to compile objective data about the changes and trends of activity patterns during long periods of time. This would comprise daily activity, rest time and, if possible, sleep quality. The PMS uses inconspicuous methods but keeping the cost associated with sensor installation at the patient¿s home to a minimum. This work focuses on the Wireless Sensor Network (WSN) enhancements introduced after real testbeds and considering User Quality of Experience (QoE), mainly oriented to reduce energy consumption and required data transmission and consequently improving the autonomy and range of the sensors.
Help4Mood aims to develop a platform to support the treatment of people with depression in their own home. Depression is one of the main causes of disability worldwide. For depression, it is essential to have a continuous control in order to check the patient status and avoid relapses. Thus, we propose Help4Mood, which is designed as a Personal Health System. It consists of a set of different wireless sensors whose data sink is centralized on a laptop and it is administered by a clinician that supports the treatment of depression. The outcome of the platform is available to the clinician in order to check the patient's status during the periodic appointments. The use of standards contributes to improve care delivery, optimize workflow and reduce ambiguity. For this reason Help4Mood is able to communicate with the Healthcare Provider using the standard of communications protocol Health Level Seven (HL7). In this work, we describe the main components, principal features of the Help4Mood and the results from the evaluation of the activity monitoring system on patients who had recovered from depression in Catalonia, Scotland and Romania. Updates caused by the results of the evaluation in the design of Wireless Sensor Network are included.
Ramos, J.; Mahdavi, H.; Perez, D.; Garcia, M.; Soraya Estevez; Rosell, F. Information and Communication Technologies applied to Mental Health p. 18-23 Data de presentació: 2012-10-04 Presentació treball a congrés
Castro, J.; Soraya Estevez; Aragones, C.; Perez, D.; Ruiz, S. IADIS Multi Conference on Computer Science and Information Systems p. 139-145 Data de presentació: 2012-07-18 Presentació treball a congrés
Help4Mood is a project inside 7th European Framework Programme (FP7) for developing a computational distributed
system to support remotely the treatment of patients with major depression at home. Core components are integrated with
the ICE framework. One of the main goals of this system is to use the paradigm of a Virtual Agent to support the first
symptoms of clinician alert of a patient, to interact with him an to prevent some causes of relapse after monitoring he/she
with different sensors. The system processes inputs from different devices for monitoring patient activity at home and
how he/she sleeps (also know as the Personal Monitoring System), transmitting this data to a Decision Support System,
and defining how a Virtual Agent should interact with the patient before clinical support from hospital is needed if an
alert is detected. This data is transmitted by a wireless network designed to improve data communication from sensors in
a home environment (easy of installation and maintenance) and implemented using customized protocols and algorithms
for reducing power consumption of these sensors. The technical framework is using open source implementations of ICE
and HL7-standard-based healthcare integration engines to interact with the different subsystems. Particularly, the use of
these standards will contribute to commercialization of the project results and the potential impact through the
development, dissemination and use.
Help4Mood is a closed loop approach supporting the
control, communication and treatment management of patients
with Major Depression. The first out of the three main components
of the Help4Mood solution is the Personal Monitoring
System (PMS), a set of different wireless sensors whose data sink
is centralized on a laptop. The objective of this PMS is to monitor
the activity of the patients, so several sensors have been chosen
to cover the needs of different individuals. These include a wrist
watch, a key ring, a waist/belt sensor, an under mattress sensor
and a cellular phone. This paper describes the first prototype
and the results obtained from this Wireless Sensor Network.
Help4Mood is a closed loop approach supporting the control, communication and treatment management of
patients with Major Depression. The first out of the three main components of the Help4Mood solution is the
Personal Monitoring System (PMS), a set of different wireless sensors whose data sink is centralized on a laptop.
The objective of this PMS is to monitor the activity of the patients, so several sensors have been chosen to cover the
needs of different individuals. These include a wrist watch, a key ring, a waist/belt sensor, an under mattress sensor
and a cellular phone. This paper describes the first prototype and the results obtained from this Wireless Sensor
The research involved in this study comprises the
analysis of the impact of the power control algorithm and its
performance in the system level. Following our work in TD 01040,
the LTE system level simulator has been equipped with a power
control block that enables interference management at the same
time that controls the fairness among users. Rising from the
fact that it is very sensitive to the environment, the algorithm
is tested in two different scenarios in a comparative way. First,
the conventional synthetic scenario, with regular hexagonal base
stations distribution, and then a piece of the scenario of Vienna,
developed during the COST 273 action in the MORANS initiative.
This dissimilarity in simulation environment leads to strong
differences in the system performance. Results show how the
real scenario is not so sensitive to interferences and so that the
major issue is the availability of transmission power at the cell
A closed loop approach supporting the control, communication and treatment management of patients with Major
Depression is presented, based on a distributed system with three main components: a Personal Monitoring System, a
Virtual Agent component and the Decision Support System for Treatment Management. In this paper an explanation
of the main concepts related with Remote Personal Monitoring and Patient Interaction that have been adopted in the
project is given, with special emphasis on the sensors selection, the design and configuration of the wireless sensor
network and the communication algorithm among the different devices allowing, as much as possible, lossless data
'Current 4G vision envisages higher data rates and multi standard radio interfaces to provide all users with a continuous seamless connection. The large number of foreseen devices coupled with the surge in power requirements for future emerging handsets raises significant challenges in terms of: i) reducing the energy consumption; and ii) reducing the amount of electromagnetic radiations.
GREENET targets the following main objectives:
1. Recruitment of ESRs with the clear and long-term objective to conduct top-notch research and to pursue research excellence at the national, European, and international levels.
2. Develop training and career plans that are personalized as possible to meet the needs and desires of each ESR.
3. To allow the ESRs to understand and address key research challenges on energy efficient GREENET communications, that form pivotal societal and economic concerns for Europe within the mid-to-long term.
4. Offer to each ESR top-level training and research programs with the twofold objective to reinforce and corroborate their own background, as well as to complement this with active participation in a multi-disciplinary network of research scientists.
5. Complement the typical competences of “applied research” with aspects related to project management, intellectual property rights, writing of patents, presentation and communication skills, writing of technical papers, exploitation of technical results and creation of start-up companies, etc.
6. Guide and help the ESRs to build the bridge from academia to a remarkable and untactful professional career in either the private or public sectors.'
This paper presents an efficient multipolling scheme
that improves the IEEE 802.11 MAC protocol efficiency and
does not suffer from the hidden terminal problem or inefficient
channel usage problems. To design an efficient polling scheme, the
access point (AP) needs to obtain information about the current
transmission status and channel state for each station. In this
new scheme, we propose the use of multipolling frames in the
downlink and Orthogonal Frequency Division Multiple Access
(OFDMA) for the uplink reservation frames in order to reduce
Garcia-Lozano, M.; Perez, D.; Valenzuela, J.; Gelonch, A.J.; Alonso, L.; Ruiz, S. Congrés Internacional de Docència Universitària i Innovació p. 1-16 Data de presentació: 2008-07-02 Presentació treball a congrés
Las ventajas de estructurar una asignatura, un conjunto o incluso todo un plan de
estudios mediante Aprendizaje Basado en Proyectos (PBL) han sido ampliamente
expuestas de forma teórica y práctica por un gran número de escuelas/universidades.
Sin embargo los beneficios de PBL no son automáticos, requieren no sólo una
cuidadosa puesta en marcha, sino también establecer los mecanismos de seguimiento
que permitan detectar y corregir los problemas de grupos poco efectivos antes de que
fracasen, así como mecanismos de evaluación de los conocimientos adquiridos tanto a
nivel de grupo como a nivel individual.
En este trabajo se exponen una serie de reflexiones y la solución finalmente adoptada
como procedimiento de evaluación en una asignatura organizada en PBL, y que con
ligeras variaciones constituye el modelo seguido por toda una titulación PBL: segundo
ciclo de Ingeniería de Telecomunicación y Master of Science in Telecommunication
Engineering & Management de la Escuela Politécnica Superior de Castelldefels (UPC).
Pensamos que algunos de los problemas con los que nos hemos encontrado a lo
largo de las 14 veces en las que se ha impartido esta asignatura, y las soluciones a las
que hemos llegado, pueden ser de utilidad a otros profesionales de la docencia.