Luis SequeiraKing's College London | KCL · Department of Informatics
Luis Sequeira
Ph.D.
About
48
Publications
11,423
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213
Citations
Citations since 2017
Introduction
My research interests focus on Quality of Service in multimedia systems, analysis and modeling of access networks and multimedia services.
Publications
Publications (48)
This paper presents a data-driven framework for trajectory recommendation in automated and cooperative driving. The considered cooperative driving manoeuvre is lane-merge coordination, and while the trajectory recommendation can only be communicated to the connected vehicles, in computation of those recommendations both connected and unconnected ve...
This article documents one of the world's first standards-compliant pre-commercial end-to-end fifth generation (5G) systems. Focus is on a standardized 5G architecture that includes the underlying 3GPP components but also the ETSI network functions virtualization management and orchestration capabilities. The truly innovative character of 5G enabli...
In this letter, the development and testing of an open enterprise Wi-Fi solution based on virtual access points (APs), managed by a central WLAN controller is presented. It allows seamless handovers between APs in different channels, maintaining the QoS of real-time services. The potential scalability issues associated to the beacon generation and...
In this paper, a framework for lane merge coordination is presented utilising a centralised system, for connected vehicles. The delivery of trajectory recommendations to the connected vehicles on the road is based on a Traffic Orchestrator and a Data Fusion as the main components. Deep Reinforcement Learning and data analysis is used to predict tra...
This work presents an analysis of the effect of the access router buffer size on packet loss rate and how it can affect the QoS of multimedia services when bursty traffic is present. VoIP traffic, real traces of videoconferencing and videosurvellance are used in two different scenarios with medium link utilization. The study shows that the bursty n...
The response in data flows transmission in real time is analyzed, for access network scenarios, in which said flows converge on an outgoing link, competing to achieve a certain level of quality of service. The concurrence of these types of flows can generate bursts of packets, which in certain circumstances can compromise the capacity of the buffer...
A Video Surveillance System (VSS) is of primary importance in public transport hubs such as airports, train or bus stations but also inside the vehicle itself. In this paper, we present a heuristic architecture model for on-board video surveillance system based on Internet of Video Things (IoVT) devices which addresses the need for delivering smart...
This work presents an analysis of the effect of the access router buffer size on packet loss rate and how it can affect the QoS of multimedia services when bursty traffic is present. VoIP traffic, real traces of viedoconferencing and videosurvellance are used in two different scenarios with medium link utilization. The study shows that the bursty n...
All the routers include a buffer in order to enqueue packets waiting to be transmitted. The behaviour of the routers' buffer is of primary importance when studying network traffic, since it may modify some characteristics, as delay or jitter, and may also drop packets. As a consequence, the characterization of this buffer is interesting, especially...
In this letter the development and testing of an open enterprise Wi-Fi solution based on virtual APs, managed by a central WLAN controller is presented. It allows seamless handovers between APs in different channels, maintaining the QoS of real-time services. The potential scalability issues associated to the beacon generation and channel assignmen...
In this paper, we study the role that machine learning can play in cooperative driving. Given the increasing rate of connectivity in modern vehicles, and road infrastructure, cooperative driving is a promising first step in automated driving. The example scenario we explored in this paper, is coordinated lane merge, with data collection, test and e...
Cooperative driving using connectivity services has been a promising avenue for autonomous vehicles, with the low latency and further reliability support provided by 5th Generation Mobile Network (5G). In this paper, we present an application for lane merge coordination based on a centralised system, for connected cars. This application delivers tr...
In this paper, a framework for lane merge coordination is presented utilising a centralised system, for connected vehicles. The delivery of trajectory recommendations to the connected vehicles on the road is based on a Traffic Orchestrator and a Data Fusion as the main components. Deep Reinforcement Learning and data analysis is used to predict tra...
This article documents one of the world's first standards-compliant pre-commercial end-to-end 5th generation (5G) systems. Focus is on a standardized 5G architecture which includes the underlying 3GPP components but also the ETSI Network Function Virtualization (NFV) management and orchestration capabilities. The truly innovative character of 5G en...
This paper studies the use of a traffic optimization technique named TCM (Tunneling, Compressing and Multiplexing) to reduce the bandwidth of MMORPGs (Massively Multiplayer Online Role-Playing Games), which employ TCP to provide a soft real-time service. In order to optimize the traffic and to improve bandwidth efficiency, TCM can be applied when t...
This work presents a study of the behaviour of the router buffer when managing the traffic of P2P-TV applications, where a number of peers exchange video content. First, a summary of the characteristics of SOPCast is presented. Then, the results obtained in simulation tests using different buffer policies are presented. Real traces of the applicati...
We study TCP flows coexistence between Massive Multiplayer Online Role Playing Games (MMORPGs) and other TCP applications, by taking World of Warcraft (WoW) and a file transfer application based on File Transfer Protocol (FTP) as an example. Our focus is on the effects of the sender buffer size and FTP cross-traffic on the queuing delay experienced...
In corporate and commercial environments, the deployment of a set of coordinated Wi-Fi APs is becoming a common solution to provide Internet coverage to moving users. In these scenarios, real-time services as online games can also be present. This paper presents a set of experiments developed in a test scenario where an end device moves between dif...
This paper compares two policies which can be used for multiplexing the traffic of a number of players of a First Person Shooter game. A network scenario in which a number of players share an access network has been simulated, in order to compare the policies in terms of a subjective quality estimator. The first policy, namely timeout, achieves hig...
Touch is seen as the modality that will complement hearing and vision as a third media stream over the Internet in a variety of future haptic applications. This chapter introduces the basics for haptic communication and discusses its quality of service and quality of experience requirements as well as the main key performance indicators (KPIs) for...
Many studies are concentrated on provisioning certain levels of Quality of Service (QoS) employing different approaches related to different areas (control congestion algorithms, transport protocols, etc). This paper is focused on the improvement of the QoS of peer-to-peer TV (P2P-TV), and in particular, it proposes a methodology to minimise the im...
This paper presents a novel Software Defined Wireless Network (SDWN) architecture that integrates coordination mechanisms to enhance the capabilities of a set of central managed Wi-Fi Access Points (APs). The global architecture is presented in detail, where the handoff mechanism is integrated with a set of active and passive monitoring tools and o...
En el presente trabajo se propone una arquitectura capaz de mejorar la calidad de las comunicaciones multimedia en redes WLAN coordinadas, mediante la utilización de SDN (Software Defined Networks). Para esto se requiere que dichas soluciones SDN sean adaptadas para poder identificar los parámetros propios de las redes Wi-Fi, tales como interferenc...
This document includes the specification of the second version of the Smart Access Point (AP) Solutions, which are being developed within WP3 of the Wi-5 project. After the Literature Review, a global view of the Wi-5 architecture is presented which includes not only the Smart AP Solutions but also the Cooperative Functionalities being developed in...
In corporate and commercial environments, the deployment of a set of coordinated Wi-Fi APs is becoming a
common solution to provide Internet coverage to moving users. In these scenarios, real-time services as online games can also be present. This paper presents a set of experiments developed in a test scenario where an end device moves between dif...
This work presents an analysis of the buffer features of an access router, especially the size, the impact on delay and the packet loss rate. In particular, we study how these features can affect the Quality of Service (QoS) of multimedia applications when generating traffic bursts in local networks. First, we show how in a typical SME (Small and M...
The behaviour of the routers' buffer may affect the quality of service (QoS) of network services under certain conditions, since it may modify some traffic characteristics, as delay or jitter, and may also drop packets. As a consequence, the characterization of the buffer is interesting, especially when multimedia flows are transmitted and even mor...
The behaviour of the routers' buffer may affect the Quality of Service (QoS) of network services under certain conditions, since it may modify some traffic characteristics, as delay or jitter, and may also drop packets. As a consequence, the characterization of the buffer is interesting, especially when multimedia flows are transmitted and even mor...
http://www.hindawi.com/journals/tswj/2014/860170/
This paper analyzes and compares two different video conference solutions, widely used in corporate and home environments, with a special focus on the mechanisms used for adapting the traffic to the network status. The results show how these mechanisms are able to provide a good quality in the hosti...
This paper studies the optimization of the traffic of a P2P-TV application (SOPCast). First, a traffic characterization is deployed, and it is observed that the service generates a high rate of small UDP packet bursts between peers. Then, an optimization method based on header compression and multiplexing is used for sending together the packets wi...
The behaviour of the routers' buffer is of primary importance when studying network traffic, since it may modify some of this characteristics, as delay or jitter, and may also drop packets affecting the Quality of Service (QoS) of different services. As a consequence, the characterization of this buffer is interesting, especially when real-time flo...
This paper compares two policies which can be used for multiplexing the traffic of a number of players of a First Person Shooter game. A network scenario in which a number of players share an access network has been simulated, in order to compare the policies in terms of a subjective quality estimator. The first policy, namely timeout, achieves hig...
Due to the Increasing deployment of real-time multimedia services like IPTV and videoconferencing, the Internet has new Challenges. These new real-time Applications require a reliable performance of the network so as to provide a good Quality of Service (QoS) so it is important for the services providers to estimate the quality offered; and regardl...
![Figure 1: R-factor improvement with different multiplexed calls [12].](profile/Idelkys-Quintana/publication/240093739/figure/fig1/AS:298612719407107@1448206228274/R-factor-improvement-with-different-multiplexed-calls-12_Q320.jpg)
![Figure 2: Packet loss for background traffic for tow buffers [13].](profile/Idelkys-Quintana/publication/240093739/figure/fig2/AS:298612719407108@1448206228332/Packet-loss-for-background-traffic-for-tow-buffers-13_Q320.jpg)
The behaviour of the routers' buffer is of primary importance when studying network traffic, since it may modify some characteristics, as delay or jitter, and may also drop packets. As a consequence, the characterization of this buffer is interesting, especially when real-time flows of interactive services are being transmitted. If the buffer chara...
This work presents a study of the behavior of the router buffer when managing the traffic of P2P-TV applications, where a number of peers exchange video content. First, a summary of the characteristics of SOPCast is presented. Then, the results obtained in simulation tests using different buffer policies are presented. Real traces of the applicatio...
We study TCP flows coexistence between Massive Multiplayer Online Role Playing Games (MMORPGs) and other TCP applications, by taking World of Warcraft (WoW) and a file transfer application based on File Transfer Protocol (FTP) as an example. Our focus is on the effects of the sender buffer size and FTP cross-traffic on the queuing delay experienced...
This paper studies the use of a traffic optimization technique named TCM (Tunneling, Compressing and Multiplexing) to reduce the bandwidth of MMORPGs (Massively Multiplayer Online Role-Playing Games), which employ TCP to provide a soft real-time service. In order to optimize the traffic and to improve bandwidth efficiency, TCM can be applied when t...
All the routers include a buffer in order to enqueue packets waiting to be transmitted. The behaviour of the routers' buffer is of primary importance when studying network traffic, since it may modify some characteristics, as delay or jitter, and may also drop packets. As a consequence, the characterization of this buffer is interesting, especially...
Projects
Project (1)
http://www.wi5.eu/
Starting in January 2015, the Wi-5 Project (What to do With the Wi-Fi Wild West) proposes an architecture based on an integrated and coordinated set of smart solutions.
The overall approach of the Wi-5 project is best summarised as follows:
Define the use cases, the requirements, and system architecture for a mature Wi-Fi networking solution to warrant the quality of the solution.
Consider which subsystems and protocols are needed and readily available and identify which parts of the solution are missing and must be developed these
Build the complete solution for the Wi-Fi network and test and validate the integrated system in an operational network.
Discuss the technical concepts, considerations and choices with technical experts and potential users to work toward a solution that is optimised from the perspective of the technology and the market.
Over the course of the next 3 years, the project consortium will work with industry to develop a novel set of smart functionalities that can be readily integrated into existing solutions and deployed to solve real-world issues with the current Wi-Fi eco-system.
