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Abstract-With the advent of various access technologies and increasing number of applications, a set of challenges concerning efficient delivery of ubiquitous services to heterogeneous users and devices have been posed. One of the important challenges is to integrate Quality of Service (QoS), security and mobility support in heterogeneous networks. To facilitate the interworking of these mechanisms we propose the concept of Enhanced Node (EN) in this paper. The EN is an intelligent entity with a network sub-layer, which integrates QoS, security and Mobility Management (MM). ENs are located in the access network and they communicate with each other via signalling. In this paper, the functionalities of the ENs are described and the framework with ENs to integrate QoS, security and MM in IPbased networks is presented. The mechanisms to provide the authenticated and authorized access control and to enhance the secured QoS combined fast handovers are also proposed.

The rapid growth in the demand for Internet services and many new applications has driven the development of satellite, which are the preferred delivery mechanism due to its wide area coverage, multicasting capacity and speed to deliver affordable future services. However, security has been one of the barriers for satellite services, especially for domains spanning over cryptographically heterogeneous networks. In this paper, a scalable and adaptable security architecture is specified to protect satellite services. Two major issues in the proposed security architecture, key management and policy provisioning, are presented and analyzed. And three scenarios, mobile network, fixed network and Delay Tolerant Network (DTN), are presented, with details on characteristics and security features.

Abstract-Delivering ubiquitous services to various users and devices through heterogeneous networks is a major aim in next generation networks. The delivery should be efficient and secure. The support and integration of security, Quality of Service (QoS) and mobility management (MM) in access networks become parts of the essential issues. An Enhanced Node (EN) with a network sub-layer is proposed here to achieve this integration. The architectural framework with ENs located in the IP-based access networks is presented. The focus of this paper is to investigate the challenges of integrating security with QoS and MM, notably the threats and requirements, based on this framework. The solutions are also proposed to provide the authenticated and authorized access control and to secure the handover process.

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