Danny De Vleeschauwer

Danny De Vleeschauwer
Nokia · Bell Labs

PHD

About

126
Publications
15,718
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,826
Citations
Additional affiliations
February 1998 - present
Alcatel Lucent
Position
  • sr research engineer
September 1987 - January 1998
Ghent University
Position
  • Researcher

Publications

Publications (126)
Article
Full-text available
With the increasing adoption of intelligent transportation systems and the upcoming era of autonomous vehicles, vehicular services (such as remote driving, cooperative awareness, and hazard warning) will have to operate in an ever-changing and dynamic environment. Anticipating the dynamics of traffic flows on the roads is critical for these service...
Conference Paper
Next-generation mobile networks are expected to flaunt highly (if not fully) automated management. To achieve such a vision, Artificial Intelligence (AI) and Machine Learning (ML) techniques will be key enablers to craft the required intelligence for networking, i.e., Network Intelligence (NI), empowering myriad of orchestrators and controllers acr...
Chapter
Meeting 5G high bandwidth rates, ultra-low latencies, and high reliabilities requires of network infrastructures that automatically increase/decrease the resources based on their customers' demand. An autonomous and dynamic management of a 5G network infrastructure represents a challenge, as any solution must account for the radio access network, d...
Preprint
Full-text available
With the increasing adoption of intelligent transportation systems and the upcoming era of autonomous vehicles, vehicular services (such as, remote driving, cooperative awareness, and hazard warning) will face an ever changing and dynamic environment. Traffic flows on the roads is a critical condition for these services and, therefore, it is of par...
Article
When a network slice is requested, multiple technology and/or administrative domains are invoked to ensure that the slice end-to-end service level agreement (SLA) is met. Therefore, this SLA requirement needs to be decomposed in portions that each of the domains can support. In this paper we consider a management architecture consisting of an end-t...
Article
HyperText Transfer Protocol (HTTP) Adaptive Streaming (HAS) has become the de facto standard video‐streaming technology. The benefits of HAS are manifold: reliable transmission of video data avoiding artifacts caused by packet loss, easy fire wall, and Network Address Translation (NAT) traversal and the seamless reuse of existing HTTP caching infra...
Article
Over the last decades, video streaming services have gained a lot of popularity, representing over 70% of the total consumer Internet traffic worldwide. While originally dedicated streaming protocols have been used to deliver these services, for several years, the video streaming industry is steadily shifting to HTTP adaptive streaming (HAS)–based...
Article
Recently, video-on-demand (VoD) streaming services like Netflix and Hulu have gained a lot of popularity. This has led to a strong increase in bandwidth capacity requirements in the network. To reduce this network load, the design of appropriate caching strategies is of utmost importance. Based on the fact that, typically, a video stream is tempora...
Conference Paper
Full-text available
The growing popularity of over the top (OTT) video streaming services has led to a strong increase in bandwidth capacity requirements in the network. By deploying intermediary caches, closer to the end-users, popular content can be served faster and without increasing backbone traffic. Designing an appropriate replacement strategy for such caching...
Conference Paper
Full-text available
We analyse a scheduling system in which users announce requests for information from a server some time before they actually need this information. Each constituent of the requested information has its own specific deadline, which is characteristic for applications that gradually consume a stream of information (e.g., video). For that purpose, a re...
Article
Full-text available
In this paper, we propose a quality metric for video transmitted over HTTP adaptive streaming (HAS). Perceived video quality in HAS strongly depends on the employed rate adaptation mechanisms, transmission conditions and buffer filling levels. Predicting perceived quality in HAS is an open problem, due to the lack of appropriateness of existing met...
Patent
Full-text available
Network devices (30) receiving first packets from first devices (10) and in response transmitting second packets to second devices (20), and receiving third packets from the second devices (20) and in response transmitting fourth packets to the first devices (10), get manipulation means (40) for manipulating information at layers higher than intern...
Patent
Full-text available
The present invention relates to a new error control paradigm in a packet switched network that is particularly advantageous for multicast transmission. A transmission Status Vector TSV (T) is updated at the sender side whenever a new outgoing data packet (Dj−1) is scheduled for transmission. A corresponding Reception status Vector RSV (R) is simil...
Article
The end user quality of experience (QoE) of content delivered over a radio network is (mainly) influenced by the radio parameters in the radio access network. This paper will present a QoE model for video delivered over a radio network (e.g., Long Term Evolution (LTE)) using HTTP (Hypertext Transfer Protocol) adaptive streaming (HAS). The model is...
Conference Paper
In this paper we analyze a trace of a deployed VoD (video on demand) system. Users issue requests for content items in an online VoD catalogue at given moments in time. Based on this information alone we identify communities of users that have similar content preferences, which we refer to as implicit social communities. We find that there is evide...
Article
Video is expected to be the dominant application by traffic volume over mobile networks in the near future. Mobile network operators are deploying video optimization techniques to enhance the user experience and network utilization for video delivery. Video optimization is typically “out-of-network” and includes techniques such as transcoding, tran...
Conference Paper
Adaptive streaming is a promising technique for video streaming service to cope with the quality degradation of mobile users' connections. In this paper we propose a service layer control mechanism for video flows based on a Reinforcement Learning (RL) paradigm that will gracefully degrade the video quality experienced by the end-user depending on...
Conference Paper
Video streaming, in particular, hypertext transfer protocol based (HTTP) adaptive streaming (HAS) of video, is expected to be a dominant application over mobile networks in the near future. The observation that the base station can alter the video quality requested by a HAS client to its server by controlling the over-the-air throughput from the ba...
Conference Paper
Full-text available
The end user QoE (quality of experience) of content delivered over a radio network is influenced by the radio conditions in the RAN (radio access network). This paper analyses various QoE models for video delivered over a radio network (e.g. LTE (long term evolution)) using HAS (HTTP adaptive streaming). All QoE models analyzed are based on the HAS...
Chapter
Global Internet traffic shows an upward trend mainly driven by the increasing demand for video services. In addition the further spread of mobile Internet leads to an increased diversification of access data rates and internet terminals. In such a context, Content Delivery Networks (CDNs) are forced to offer content in multiple versions for differe...
Conference Paper
Caching is an effective technique to improve the quality of streaming multimedia services. In this paper, we propose a novel content caching scheme referred as “Cache Management using Temporal Pattern based Solicitation” (CMTPS), to further minimize both service delays and load in the network for Video on Demand (VoD) applications. CMPTS is based o...
Article
HTTP-based video streaming has been gaining popularity within the recent years. There are multiple benefits of relying on HTTP/TCP connections, such as the usage of the widely deployed network caches to relieve video servers from sending the same content to a high number of users and the avoidance of traversal issues with firewalls and NATs typical...
Article
Driven mainly by its adoption as a new media distribution platform for content providers and its ubiquitous availability for the end user's media production and consumption, the Internet is rapidly reshaping. In particular, the stakeholders in the content distribution market are considering exploiting content delivery networks (CDNs) to play a key...
Article
Full-text available
In this paper, we investigate the proxy video caching problem and propose a specific caching replacement strategy for segmented video streaming. The proposed caching algorithm makes use of the natural linear time structure of video streaming, which fits the philosophy of the optimal MIN algorithm. By observing the watching positions of active viewe...
Article
In order to cope with the rapidly increasing video traffic (both downloaded and streamed) resulting from Internet TV, a telecommunications company (telco) can deploy a network of caches, which sit closer to the user than the point-of-presence of a traditional content distribution network (CDN), like Akamai or Limelight Networks. This network of hig...
Article
Video broadcast operators target a variety of receiving devices of different resolutions and processing capabilities. In such a heterogeneous TV network, the transport resource consumption is likely to increase. In this paper we estimate the required capacity for a broadcast TV network taking into account parameters as currently proposed in standar...
Conference Paper
Full-text available
HTTP-based delivery for Video on Demand (VoD) has been gaining popularity within recent years. Progressive Download over HTTP, typically used in VoD, takes advantage of the widely deployed network caches to relieve video servers from sending the same content to a high number of users in the same access network. However, due to a sharp increase in t...
Conference Paper
Full-text available
HTTP-based delivery for Video on Demand (VoD) has been gaining popularity within recent years. Progressive Download over HTTP, typically used in VoD, takes advantage of the widely deployed network caches to release video servers from sending the same content to a high number of users in the same VoD service. However, due to the inherent heterogenei...
Article
Full-text available
The catch-up TV (CUTV) service allows users to watch video content that was previously broadcast live on TV channels and later placed on an on-line video store. Upon a request from a user to watch a recently missed episode of his/her favourite TV series, the content is streamed from the video server to the customer’s receiver device. This requires...
Article
Full-text available
It is customary nowadays that large web objects are cached somewhere close to the user. This saves traffic upstream of the cache and offers the users a better responsiveness. Caching algorithms typically rank the objects in some way and cache the top-ranked objects. In this paper we study a scenario in which a requested video is (instantaneously) s...
Article
Dimensioning buffers is still an area open to research efforts and discussions and much study work has been conducted on this topic recently. Most of this work is focused on sizing buffers in core routers in which a huge number of flows compete. Different, sometimes contradictory theories and buffer dimensioning formulae are put forward, which take...
Article
Predicting the life cycle and the short-term popularity of a Web object is important for network architecture optimization. In this paper, we attempt to predict the popularity of a Web object given its historical access records using a novel neural network technique, reservoir computing (RC). The traces of popular videos at YouTube for five continu...
Conference Paper
Full-text available
The last-mile has limited bandwidth and forms a bottleneck link for video applications. Current solutions fail to offer sufficient Quality of Service (QoS) in this last-mile because they allow packet loss randomly in a stream, while packet loss, depending on which part or layer of the video, has strong impact on the final quality. Our paper propose...
Article
Full-text available
Distributional forms of Little's law relate the steady-state distributions of the number of customers in a queueing system (system content) and the time a customer spends in the system (delay). A new law for discrete-time multiserver queues is discussed, with single-slot service times, a first-come-first-served discipline and heterogeneous server i...
Conference Paper
Full-text available
Quality of Experience (QoE) relates to how users perceive the quality of an application. To capture such a subjective measure, either by subjective tests or via objective tools, is an art on its own. Given the importance of measuring users’ satisfaction to service providers, research on QoE took flight in recent years. In this paper we present an o...
Chapter
Full-text available
Quality of Experience (QoE) relates to how users perceive the quality of an application. To capture such a subjective measure, either by subjective tests or via objective tools, is an art on its own. Given the importance of measuring users’ satisfaction to service providers, research on QoE took flight in recent years. In this paper we present an o...
Article
This paper presents three approaches to estimate the required resources in an infrastructure where digital TV channels can be delivered in unicast or multicast (broadcast) mode. Such situations arise for example in Cable TV, IPTV distribution networks or in (future) hybrid mobile TV networks. The three approaches presented are an exact calculation,...
Article
Full-text available
Internet evolved from a world communication network with restricted information transmission capabilities into an entertainment and information network with many broadband clients and more multimedia-rich applications. In particular, video (streaming) applications are gaining in popularity and usage, but those are also notorious for their high reso...
Conference Paper
Full-text available
We consider a centralised (client-server) digital TV network with heterogeneous receiver devices of different resolutions, requiring a multi-rate transport system. There exist two main ways to store and transport (streamed) TV channels in such a system: either by providing different single-layer versions of a channel (simulcast transport mode) or b...
Conference Paper
Full-text available
Video broadcasters currently envision to target a variety of receiving devices of different resolutions. In such a heterogeneous TV network the transport resource consumption is likely to increase as the types and number of receiving devices increase. We estimate the required capacity for an IPTV and mobile TV network taking into account parameters...
Article
Due to its native return channel and its ability to easily address each user individually an IPTV system is very well suited to offer on-demand services. Those services are becoming more popular as there is an undeniable trend that users want to watch the offered content when and where it suits them best. Because multicast can no longer be relied u...
Article
One of the biggest advantages of interactive television (TV) is that it allows the viewer to watch the content at his or her most convenient time, either by pausing an ongoing broadcast or by selecting to view the content at a time later than the original airing time. The former service, often referred to as Pause Life TV (PLTV), and the latter, of...
Article
Of all the services offered over a worldwide public network, digital video-based services, even at this early stage of development, are growing at such an astonishing rate that they will soon constitute the largest portion of Internet traffic. We are witnessing this today with the Internet television (TV) phenomenon, with YouTube, Netflix's online...
Article
The current heterogeneity in networks and devices demands for a high degree of flexibility in IPTV systems for digital television. A scalable video coding scheme (in this paper we focus on H.264/AVC’s scalable video coding extension SVC) accommodates this flexibility from the coding point of view. Because the IP-based network delivery chain in IPTV...
Article
Broadband access networks, traditionally deployed for data services, increasingly need to support streaming services as well. Some papers have predicted the bit rate an access link should be able to carry in order to support a future mix of all services. These predictions typically take two trends into account: the fact that the information is offe...
Conference Paper
We investigate the impact of forward error correction (FEC) and retransmissions on the video quality of packetized HDTV video flows with possible buffer overflow at the ingress node of the video network. The use of protection is a mixed blessing. On the one hand, it increases the packet rate associated with each video flow (due to overhead), which...
Article
Full-text available
A digital subscriber line access multiplexer that multiplexes streaming packetised telephony and/or video-on-demand traffic is studied. To this end, the distribution of the amount of work in a discrete-time single-server queuing model with heterogeneous sources and general packet lengths is calculated. Obtaining actual data concerning the distribut...
Article
We compare the adequacy of two models for realistic video sources, namely the fractional Brownian motion (fBm) and Markov modulated fluid flow (Mmff) models. We use the effective bandwidth approach to get the probability that the buffer content exceeds a certain threshold. We use a formula in which the variance function, i.e., the variance of the t...
Article
Television (TV) consumers adore interactivity and personalization. Internet Protocol television (IPTV) systems help satisfy this desire by providing different services including video-on-demand (VoD), network personal video recording (NPVR), and time shift TV (TSTV). However, these services place a heavy traffic load on the network by requiring a u...
Article
A critical component in the delivery of VBR streaming video over packet-based networks, is the playout buffer at the receiver side. As packets will incur a variable delay within the network, a mechanism is needed to dejitter the stream and assure that packets are played out at exactly the same rate at which they were generated by the sender. Packe...
Article
Full-text available
Video content can be provided to an end user by transmitting video data as a sequence of internet protocol (IP) packets over the network. When the network contains a wireless link, packet erasures occur because of occasional deep fades. In order to maintain a sufficient video quality at the end user, video packets must be protected against erasures...
Conference Paper
We examine the efficiency of two FEC strategies for the protection of HDTV video packets transmitted at variable bit rate. The first FEC strategy pursues packet protection by means of a fixed Reed-Solomon code. The second strategy encodes a set of packets within a fixed time frame resulting in Reed-Solomon codes of variable length. We quantify the...
Article
Packet loss ratios that are harmless to the quality of data and Voice over Internet Protocol (VoIP) services may still seriously jeopardize that of Internet Protocol television (IPTV) services. In digital subscriber line (DSL)-based access networks, the last mile in particular suffers from packet loss, but other parts of the network may do so too....
Article
The technological challenges for an Internet Protocol television (IPTV) service provider to bring high quality video services into the home through a dedicated bandwidth limited digital subscriber line (DSL) access link are significant. However, at the same time, the dedicated DSL link provides certain opportunities as it allows for service customi...
Article
Full-text available
Currently, digital television is gradually replacing analogue TV. Although these digital TV services can be delivered via various broadcast networks (e.g., terrestrial, cable, satellite), Internet Protocol TV over broadband telecommunication networks offers much more than traditional broadcast TV. Not only can it improve the quality that users expe...
Conference Paper
Full-text available
Mobile TV is growing beyond the stage of experimentation and evaluation and is (about) to become part of our daily lives. Additionally, it is being delivered through heterogeneous networks and to a variety of receiving devices, which implies different versions of one and the same video content must be transported. We propose two (approximate) analy...
Article
Full-text available
Mobile TV is growing beyond the stage of ex-perimentation and evaluation and is (about) to become part of our daily lives. Additionally, it is being delivered through heterogeneous networks and to a variety of receiving devices, which implies different versions of one and the same video content must be transported. We propose two (approximate) anal...
Conference Paper
Full-text available
The diversity of multimedia-enabled devices supporting streamed multimedia is ever growing. Multicast delivery of TV channels in IP networks to a heterogeneous set of clients can be organised in many different ways, which brings up the discussion which one is optimal. Scalable video streaming has been believed to be more efficient in terms of netwo...
Article
We evaluate the performance of various retransmission schemes to achieve the goal of less than one visible distortion in twelve hours for High Definition Television. The focus is on an indoor wireless link and a DSL link, and we consider systems where the packets are protected by means of retransmissions with and without Forward Error Correcting (F...
Conference Paper
The required capacity for an IP TV distribution network decreases if the right TV channels are multicast, while the others rely on unicast. In [1] we proposed mathematical models to determine this required capacity in two network scenarios: the “static” and “dynamic” scenarios. As the exact calculations turned out to be too tedious, we developed ap...
Article
Full-text available
We investigate the impact of retransmissions on the HDTV video packet loss ratio over a network in which video packets are at the risk of getting lost due to buffer overflow. The use of retransmissions in these circumstances is a mixed blessing. On the one hand, retransmissions add to the packet sending rate associated with each video flow, which i...
Conference Paper
Full-text available
In First Person Shooter (FPS) games the Round Trip Time (RTT), i.e., the sum of the network delay from client to server and the network delay from server to client, impacts the gamer's performance considerably. Game client software usually has a built-in process to measure this RTT (also referred to as ping time), and therefore gamers do not want t...
Conference Paper
Full-text available
We design some simple binary codes that are very well suited to reconstruct erased packets over a transmission medium that is characterized by correlation between subsequent erasures. We demonstrate the effectiveness of these codes for the transmission of video packets for HDTV over a DSL connection.