A5025363037- Wireless Networks and Protocols
- Mobile Ad Hoc Networks
- Energy Efficient Wireless Sensor Networks
- Advanced Wireless Network Optimization
- Vehicular Ad Hoc Networks (VANETs)
- Wireless Communication Networks Research
- Power Line Communications and Noise
- Energy Harvesting in Wireless Networks
- Cooperative Communication and Network Coding
- Opportunistic and Delay-Tolerant Networks
- Advanced Wireless Communication Techniques
- Bluetooth and Wireless Communication Technologies
- Advanced MIMO Systems Optimization
- Caching and Content Delivery
- Multimedia Communication and Technology
- Traffic Prediction and Management Techniques
- Autonomous Vehicle Technology and Safety
- IPv6, Mobility, Handover, Networks, Security
- Indoor and Outdoor Localization Technologies
- Video Analysis and Summarization
- IoT and Edge/Fog Computing
- Context-Aware Activity Recognition Systems
- Media and Digital Communication
- IoT-based Smart Home Systems
- Millimeter-Wave Propagation and Modeling
Universitat Politècnica de Catalunya
2014-2024
i2CAT
2010-2023
FC Barcelona
2018-2022
Software (Spain)
2020
AT4 wireless (Spain)
2006
Centre de Recerca Matemàtica
2002
Duty-cycled Medium Access Control (MAC) protocols certainly improve the energy efficiency of wireless networks. However, most these still suffer from severe degrees overhearing and idle listening. These two issues prevent optimum usage, a crucial aspect in energy-constrained networks such as sensor (WSNs). Wake-up radio (WuR) systems drastically reduce problems by completely switching off nodes' microcontroller unit (MCU) main transceiver until secondary, extremely low-power receiver is...
Energy-efficient communication is one of the main concerns wireless sensor networks nowadays. A commonly employed approach for achieving energy efficiency has been use duty-cycled operation radio, where node’s transceiver turned off and on regularly, listening to radio channel possible incoming during its on-state. Nonetheless, such a paradigm performs poorly scenarios low or bursty traffic because unnecessary activations transceiver. As an alternative technology, Wake-up Radio (WuR) systems...
Abstract The main goal of the H2020-CARAMEL project is to address cybersecurity gaps introduced by new technological domains adopted modern vehicles applying, among others, advanced Artificial Intelligence and Machine Learning techniques. As a result, CARAMEL enhances protection against threats related automated driving, smart charging Electric Vehicles, communication or between roadside infrastructure. This work focuses on latter presents architecture aiming at assessing integrity...
In atypical deployment of IEEE 802.11 wireless LANs in the infrastructure mode, an access point acts as abridge between and wired parts network. Under current Distributed Coordination Function (DCF) method, which provides equal channel probability to all devices a cell, cannot relay frames that it receives on downlink. This causes significant unfairness upload download connections, long delays, frame losses. problem comes from not-so-complex interaction transport-layer protocols with...
Wireless Sensor Networks (WSNs) are attracting more and interest since they offer a low-cost solution to the problem of providing means deploy large sensor networks in number application domains. We believe that crucial aspect facilitate WSN diffusion is make them interoperable with external IP networks. This can be achieved by using 6LoWPAN protocol stack. enables transmission IPv6 packets over WSNs based on IEEE 802.15.4 standard. packet size considerably larger than data frame. To...
Energy-efficient operation is a challenge for wireless sensor networks (WSNs). A common method employed this purpose duty-cycled operation, which extends battery lifetime yet incurs several types of energy wastes and challenges. promising alternative to the use wake-up radio (WuR), where main microcontroller unit (MCU) transceiver, that is, two most energy-consuming elements, are kept in energy-saving mode until special signal from another node received by an attached, secondary, ultra-low...
The use of duty-cycling in Medium Access Control (MAC) protocols effectively helps improving the energy efficiency wireless networks. However, while benefits these are unquestionable, most them still suffer from overhearing and idle listening, two issues that prevent duty-cycled systems achieving optimum usage, which is a crucial aspect specific types networks such as Wireless Sensor Networks (WSN).Wake-up Radio (WuR) have been employed recently to overcome issues. Under this approach,...
Today, the vast majority of personal communication devices, such as laptops, smartphones, and logically wireless fidelity (Wi‐Fi) access points feature IEEE 802.11 chipsets. In turn, wake‐up radio (WuR) systems are used to reduce significant energy waste that devices cause during their idle mode. A novel WuR system is introduced enables any 802.11‐enabled device be a transmitter without requiring hardware modification. The corresponding developed receiver achieves remarkably low power...
Wake-up radios present a promising alternative to traditional duty-cycle approaches, by reducing overhearing and eliminating idle listening completely. However, energy-efficient operation of the wake-up mechanism is required for success such systems. In particular, addressing an important component procedure that can consume significant portion energy required. Hence, in this paper we propose novel scheme addressing. The proposed method called Time-Knocking (TicK), since it utilizes time...
Most studies about the performance of IEEE 802.11 are limited to a single cell environment. Nevertheless, idea designing an outdoor cellular network based on WLAN is very attractive, due several advantages that this technology presents: low cost equipment, its operation in unlicensed spectrum and higher data rates. In paper, we study possibility 802.11g standard. We present under different load conditions compare behavior with results obtained isolated environment, without co-channel...
Cooperative-Intelligent Transport Systems (C-ITS) are one of the flagships new coming automotive and communication industries. Mobility needs to be safer more efficient C-ITS key for this era. On hand, organizations like ETSI, IEEE, SAE, 3GPP or ISO developing standards technologies protocols and, on other, manufacturers operators deploying testing their first pilots. In paper, we present a pilot developed by group stakeholders, in which vehicles will alert drivers potential collisions with...
Traditionally, cellular wide area networks like UMTS are used as Internet access for particular users but, in some cases, they can be employed to provide other smaller well. The main inconvenient is that have not the same bandwidth than wired and therefore, channel becomes a network bottle-neck. To help mitigate this situation order improve user's experience different optimization techniques exist, especially web traffic. This paper studies first existing synergies at HTTP layer between...
Abstract Since the advent of first IEEE 802.11 standard for WLANs, several papers have been presented that evaluate DCF access method. In realistic WLAN environments frame errors usually occur due to non‐ideal channel conditions; in this way, including adverse transmission conditions evaluation published later literature. paper, we review existent analytical models include influence performance. We modify current and provide a more accurate analysis, thus allowing single rate multi‐rate...
Nowadays, we are ready to have precommercial Cooperative Intelligent Transport Systems (C-ITS), nevertheless there exist challenging functional and security aspects that need be addressed. One of them is the fact that, in every era, will several radio technologies which used by vehicles connected between them, therefore, systems needs provide interoperability services. The other critical issue reinforce against attacks on localization receivers or equipment. Most these functions based a...
The Pervasive Computing field is almost always addressed from application, middleware, sensing or Human Computer Interaction perspective. Thus, solutions are usually designed at application level involve developing new hardware. Although current layered network architectures (mainly TCP/IP stack) have enabled internetworking of lots different devices and services, they neither well-suited nor optimized for pervasive computing applications. Hence, we firmly believe that should an underlying...
Vehicular communications will foster mobility services and enable mass adoption of future autonomous vehicles, interchanging huge amount data acquired from vehicles’ sensors. 3GPP Release 14 presents the first standard for supporting V2X in LTE. Several enhancements are introduced, including a new arrangement physical resource grid, where subchannels minimum unit instead Resource Blocks. The grid is defined by several design parameters, some them with constraints imposed specifications, that...
With the advent of Connected and Autonomous Vehicles (CAVs) comes very real risk that these vehicles will be exposed to cyber-attacks by exploiting various vulnerabilities. This paper gives a technical overview H2020 CARAMEL project (currently in intermediate stage) which Artificial Intelligent (AI)-based cybersecurity for CAVs is main goal. Most possible scenarios are considered, an adversary can generate attacks on CAVs, such as camera sensors, GPS location, Vehicle Everything (V2X)...
Up to the present, several studies have been performed in order provide prioritization of stations or classes service for WLAN IEEE 802.11. The 802.11e draft specification aims extend original 802.11 MAC protocol support QoS. One mechanisms prioritizing traffic is assignment different AIFS times each priority level. Nevertheless, AIFSs employed are separated by values that multiples slot time. Therefore, due fact backoff time counter slotted, levels can attempt transmission simultaneously....
In this paper, we address the issue of evaluating performance wireless LANs in multicell scenarios. We try to understand complex behavior DCF (distributed coordination function) access method defined IEEE 802.11 standard [1] and its modifications proposed for improving performance: slow decrease [2], asymptotically optimal backoff [3], idle sense [4]. analyze influence overlapping cells large environments on their performance. Our results show that two (slow AOB) exhibit important unfairness...