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It is expected that next generation of networks will handle new types of services which are destined to large audiences and have different QoS requirements. From the transport point of view, multicast is the most suitable technology for the required group communication services, since it avoids packets duplication and saves network resources. However,(More)
Mobility management and ubiquitous access for real-time multiuser sessions with Quality of Service (QoS) support are major requirements to the success of next generation wireless systems. In this context, MultiUser Session Control (MUSC) is proposed to allow fixed and mobile users to access multiuser sessions ubiquitously, while providing QoS mapping, QoS(More)
Context-aware computing can play a major role to improve the services of mobile networking systems. In this paper, we focus on optimizing handover decisions in heterogeneous environments, where the user has a choice among different mobile networks and access points. In our approach, the decision is not only based on the signal quality, but also on the(More)
Cooperation incentives are essential in user-centric networks to motivate users to share services and resources (including bandwidth, computational power, and storage space) and to avoid selfish nodes to hinder the functioning of the entire system. Virtual currency and reputation mechanisms are commonly adopted in online communities to boost participation,(More)
Next generation IP wireless systems are envisioned to be heterogeneous and to provide ubiquitous services to mobile users with different quality of service requirements. Furthermore, in order to attract and keep customers, mobile operators are expanding their portfolio with the inclusion of publish-subscribe services, such as real-time multimedia sessions.(More)
This document is written in the context of the Delay Tolerant Networking Research Group and will be presented for reviewing by that group. This document defines dLife, an opportunistic routing protocol that takes advantage of time-evolving social structures. dLife belongs to the family of social-aware opportunistic routing protocols for intermittently(More)
The substantial advancement and proliferation of wireless technologies leads to the need to efficiently manage user mobility. Furthermore, the simultaneously emerging of services like video-conference, radio and TV has emphasized the importance to deliver content to several simultaneous receivers. This way, one of the key challenges to deploy multiuser(More)
—The great demand for real-time multimedia sessions encompassing groups of users (multiuser), associated with the limitations of the current Internet in providing quality assurance, has raised challenges for defining the best mechanisms to deploy the Next Generation of Networks (NGN). There is a consensus that an efficient and scalable provisioning of(More)
Opportunistic routing is being investigated to enable the proliferation of low-cost wireless applications. A recent trend is looking at social structures, inferred from the social nature of human mobility, to bring messages close to a destination. To have a better picture of social structures, social-based opportunistic routing solutions should consider the(More)
The efficient management of network resources together with the Quality of Service (QoS) control of real-time multimedia group communication sessions in Next Generation Networks (NGN) is still a challenging research goal. The unified control of the session quality level, distribution tree allocation and network resources in NGN will increase the user(More)