Tiia Ojanperä

VTT Technical Research Centre of Finland | vtt · Network Technologies

5G mobile network technology together with edge computing will create new opportunities for developing novel road safety services in order to better support connected and automated driving in challenging situations. This paper studies the feasibility and benefits of localized mobile network edge applications for supporting vehicles in diverse condi...

In this article, we describe an integrated satellite-terrestrial system for 5G and beyond. The focus of this paper is to describe the system architecture, define the most important technological advances, and specifically look at challenges and solutions for road safety and maritime communications. Selected use cases represent areas where both sate...

Making networks aware of applications and vice versa is a current trend in the design of emerging network management and service architectures. Additionally, new protocols and application adaptation approaches have been proposed in order to enhance the transmission of Quality of Service (QoS) sensitive data in the best effort Internet. This paper c...

With wireless networks becoming ever more ubiquitous and the capabilities of the devices connected to them rivalling those of desktop computers, there is an acute need for the communications in these networks to be managed as efficiently and autonomously as possible. Moreover, as the number of connected devices is rapidly increasing, the problem is...

The future Internet will be highly heterogeneous in supporting a multitude of access technologies and networks with overlapping coverages. Optimization of network operations like management of resources, mobility or Quality of Service in order to ensure smooth network operation and high user satisfaction will be very challenging in the future netwo...

The prevalence of broadband wireless networks offering nearly ubiquitous Internet connectivity today has opened new possibilities for utilizing wireless and mobile services also in eHealth applications. However, such services often involve transmission of critical multimedia data, thus having stringent requirements for network Quality of Service (Q...

There is demand for solutions capable of managing the constantly increasing video traffic loads over wireless networks while ensuring sufficient QoS and QoE for mobile video services. This paper presents a hierarchical network management architecture for optimized mobile video streaming in heterogeneous multi-access networks. The architecture joint...

Multimedia analysis is an exciting and fast-moving research area. Unfortunately, historically there has been a lack of software solutions in a common programming language for performing scalable integrated analysis of all modalities of media (images, ...

Video content as one of the key features of future Internet services should be made ubiquitously available to users. Moreover, this should be done in a timely fashion and with adequate support for Quality of Service (QoS). Although providing the required coverage for ubiquitous video services, wireless networks, however, pose many challenges especi...

In the future, mobile Internet access is expected to be over heterogeneous technologies and with support for dynamic adaptation in order to adjust efficiently to the varying network availability and conditions. To remove the burden of multi-access network management from users and operators, cognitive network management mechanisms may be used for o...

Video service adaptation capabilities are essential for the efficient utilization of the network resources in heterogeneous multi-access environments and ensuring sufficient perceived service quality for the end users. Multihoming is seen as one important enabler for high-quality and reliable video streaming services and it is expected to be suppor...

Future Internet will be highly heterogeneous supporting a multitude of access technologies with overlapping coverages. The automation and optimization of network operations like resource, mobility or QoS management in such a multi-access and multi-operator environment becomes a very challenging but vital task in order to ensure smooth network opera...

End-to-end optimised Quality of Service (QoS) and its specific declination for multimedia applications with the end-user Perceived Quality of Service (PQoS) is nowadays a trendy topic in the literature. Many different techniques and approaches have been proposed, which are in general focusing on specific weak technical aspects of the transmission c...

Multi-homing is expected to be an important enabler of the future Internet. Already today, terminal devices are equipped with multiple network interfaces and able to use them simultaneously. In the future, mobile multimedia services such as video streaming can maximize the user experienced quality by utilizing the available network resources, concu...

Multimedia delivery in mobile multiaccess network environments has emerged as a key area within the future Internet research domain. When network heterogeneity is coupled with the proliferation of multiaccess capabilities in mobile handheld devices, one can expect many new avenues for developing novel services and applications. New mechanisms for a...

The recent trend in Internet traffic indicates the proliferation of usage of multimedia services where a substantial part is related to some sort of video transmission. Moreover, an increasing number of Internet users employ wireless access technologies. High-quality video streaming over wireless access in unison with great mobility brings challeng...

The increasing demand for mobile video delivery has boosted the development of mechanisms which improve the Quality of Service (QoS) of video transmission through bitstream adaptation. In this paper, we study adapting H.264/SVC streams in the MAC layer. We introduce a generic QoS architecture for implementing both inter- and intra-traffic class QoS...

Scalable Video Coding (SVC) creates new possibilities for video service delivery in heterogeneous multi-access networks as it allows splitting the video into independently streamable layers. Today’s terminal devices often have multiple network interfaces, and with multihoming and mobility capabilities the devices are able to use the interfaces also...

This paper describes the CELTIC project on "Scalable Video Coding Impact on Networks" with the focus of designing a streaming system based on the Scalable Video Coding extension of the H.264/AVC standard. The system is designed to cope with streaming scenarios that can be classified in four use cases: session handover, network congestion, receiver...

This paper presents the system architecture designed by the ICT FP7 OPTIMIX project to enable enhanced multimedia streaming in a point to multi-point context on wireless heterogeneous systems. The peculiarity of the OPTIMIX system is the introduction of new control blocks, i.e., controllers and observer, to efficiently handle the optimization of th...

Proceedings of the 5th International ICST Mobile multimedia communications conference, 6 p. Multimedia delivery in mobile multiaccess network environments is gaining traction as a key area within the future Internet research domain. When network heterogeneity is coupled with the proliferation of multiaccess capabilities of mobile handheld devices,...

Despite the interest, the utilization of today's networking environment including a variety of access technologies and various services and capabilities is still minimal. Multiaccess mobile devices already on the market provide a capability to hand over the heterogeneous networks but so far there has not been any commonly approved way to efficientl...

We describe the ADIMUS architecture which addresses the problem of maintaining the subjective quality of multimedia streaming for a mobile user. In contrast to other works, the entire end-to-end path of the video stream is considered. Adaptation mechanisms for maintaining quality include time-critical handovers, overlay routing and network estimati...

OPNET environment is a powerful tool for telecommunication simulations. In a project, results of which are presented here, OPNET was used to build models of selected components of MERCoNe architecture: a WLAN access point that is capable of reporting the status of the radio interface and a triggering engine that collects the reports and can distrib...

The criteria used by state-of-the-art mobility protocols in their handover decision-making are very limited. The protocols typically rely on routing advertisements or signal strength measurements in mobility detection but these criteria fail to reflect the actual transmission conditions in the networks. Instead, more extensive information originati...

Heterogeneous multi-access networks pose new challenges for service development as supporting QoS-sensitive multi- media applications in such a dynamic environment requires additional mechanisms. The session continuity support mech- anisms have to be designed so that they respect the exist- ing communication principles. Only this way they can be su...

An optimally working mobile system requires tight cooperation and an information stream that flows impeccably between its components. This, however, is not the current state of the art, as applications and system components must each, in isolation, acquire data, create a knowledge base, and maintain it with diligence. We introduce chronicle recogni...

The advances in multimedia and network technologies have created novel services (e.g. Video-on-Demand, IPTV and Gaming-on-Demand), which set high Quality of Service (QoS) requirements. There are various existing QoS support technologies for networks, but these are used and controlled by network operators and single service providers have no possibi...

This paper presents experiments with an adaptation architecture for a novel client-server based broadband gaming solution, a gaming-on-demand service. The adaptation solution was implemented to an experimental gaming-on-demand setup to evaluate its advantages by measuring adaptation performance under emulated real world network conditions. The obta...

This paper presents an empirical task-based user evaluation, which was carried out for the purpose of assessing the subjective QoS of a mobile multimedia web service in a real multi-access network environment comprising of WLAN and GPRS networks and automatic mobility management with Mobile IP. Subjective quality ratings were collected from 20 test...

The advanced smartphones entering the mass market are capable of playing audio and video files back, which paves the way for new types of rich mobile multimedia services. However, these services impose high data rate requirements on the wireless link, which can not necessarily be satisfied with the current mobile phone networks. This can be compens...

Proceeding of IEEE Globecom 2010. Communications Software, Services and Multimedia Applications Symposium. Dec. 6 - 10, Miami, Florida, 2010 IEEE Globecom 2010