Miguel A. García‐Martín

Resource Sharing and Discovery on Top of IMS

This paper presents the architecture and the signaling flows of a multi-service overlay network implemented over the IP Multimedia Subsystem (IMS). The overlay network uses the concept of SIP-based Peer-to-peer (P2P) for providing resource sharing services, such as photograph exchange, allowing the distribution of resources across an overlay network formed for that purpose. The SIP P2P overlay network forms a cost efficient platform for providing innovative mobile services. Using the presented platform, fixed and mobile operators can provide valuable services utilizing the strengths of the IMS such as sophisticated charging, control, security and authentication mechanisms.

Social Distributed Hash Table

This paper presents an architecture called social distributed hash table (SDHT) that combines strengths of distributed hash table (DHT) algorithms and social networks making mobile search fast and context oriented. The paper presents possible implementations of the proposed architecture in the IP multimedia subsystem (IMS) and as a standalone SIP based system. The architecture forms a cost efficient platform for providing innovative mobile services that take advantage of social context of human communication. The architecture can be used to deploy a global virtual mobile network by placing SDHT nodes in different geographical regions. The paper also presents a content sharing inside community service.

IMS: The New Generation of Internet-Protocol-Based Multimedia Services

Legacy networks, both fixed and mobile, which were originally designed for voice communications, are progressively migrating to new infrastructures that promise to revolutionize the services offered. In this paper, we will cover this new generation of personal communication services, with an emphasis on the family of Internet protocol (IP)-based multimedia subsystem (IMS)-aided infrastructure that relies on the session initiation protocol (SIP). As a benefit, the end users will enjoy a new generation of personal communications services that are accessible anywhere and anytime. These services are directly related to the end users rather than to their diverse devices. It is anticipated that the new deployments of next-generation networks (all-IP based) will accelerate the adoption of the IMS technology.

Contacter: An Enhanced Contact Application for Easy Update and Recovery of Contacts Using the Session Initiation Protocol (SIP)

This paper presents a peer-to-peer (P2P) application that extends functionality of Personal Information Manager (PIM) software installed in end user devices such as mobile phones. The application facilitates end-to-end connectivity by allowing devices to automatically request contact information from and update contact information stored in other devices. Utilizing automatic update of contact information the application also provides a method for recovery of lost contact information. The application utilizes the session initiation protocol (SIP) for establishing sessions between peer nodes making the system interoperable with IP multimedia subsystem (IMS) in cellular and fixed networks. The application can be used to support community services.