Teemu Rinta-Aho

Handover performance with HIP and MIPv6

Mobility management in the current Internet is designed to work with mobile IPv4 and, when IPv6 is available, with mobile IPv6. These solutions are based on the current architecture in the Internet, where the IP address represents both the locator and the identifier of the node. In the IETF, identity and location information separation has raised a lot of discussion and new ideas have emerged to separate these. Host identity protocol is one candidate that can be used for this separation. It introduces also a new way of handling mobility management taking advantage on the mentioned identity and location separation.

Generic Abstraction of Access Performance and Resources for Multi-Radio Access Management

In this paper abstract metrics for the performance and resource situation of an access system are derived Such an abstraction is needed for multi-access systems where different, typically heterogeneous access systems shall be coordinated in an efficient way. There, the abstractions are used to compare and evaluate different access technologies as part of the access selection process and also to compare the link capabilities or link performance with the service requirements. The abstractions are performed by means of a generic link layer (GLL), which thereby hides the technology-specific characteristics from the access selection performed by multi-radio resource management (MRRM). It is also shown how these abstracted metrics can be used in a number of different access selection algorithms.

Ambient Networks - A Framework for Multi-Access Control in Heterogeneous Networks

In the ambient networks project research is ongoing in order to define a new control space for future internetworking. This internetworking will be characterized by a high degree of network heterogeneity as well as nomadicity and mobility of both users as well as networks. The so called ambient control space (ACS), provides functionality to support how to manage these traits of future internetworking. This paper provides a short presentation on the architecture of ambient networks and the ACS, and then focus on how connectivity is handled from a multi-access and mobility perspective through the support of the ACS.

Ambient Network Attachment

The efficiency of network attachment plays a crucial role in the performance of accessing services in new environments. As an example, when a moving network is changing its location relative to attachment points, the detection of the candidate access networks along with their properties and security relationships needs to be carefully managed. This paper presents the framework and mechanisms for network attachment of Ambient Networks. Different steps required for optimizing the network attachment procedure are studied, and a secure network attachment protocol is proposed.

Access Flow based Multi-Radio Access Connectivity

This paper describes the steps and the procedures involved to establish access flows for a user data session in multi-radio access networks. The description is evolved around the overall connectivity abstraction model defined in the ambient networks (AN) project. This model uses access flows as its fundamental objects which are the result of two main access selection procedures: network attachment and flow setup. All access abstractions and procedures have been developed to handle the requirements of efficient multi-access resource management through all stages of access connectivity. The paper discusses some design trade-off for the establishment of access flows concerning setup delays and resource efficiency.