Jaime Garcia

H-P2PSIP: Interconnection of P2PSIP domains for global multimedia services based on a hierarchical DHT overlay network

The IETF P2PSIP WG is currently standardising a protocol for distributed multimedia services combining the media session functionality of SIP and the decentralised distribution and localisation of resources in peer-to-peer networks. The current P2PSIP scenarios only consider the infrastructure for the connectivity inside a single domain. This paper proposes an extension of the current work to a hierarchical multi-domain scenario: a two level hierarchical peer-to-peer overlay architecture for the interconnection of different P2PSIP domains. The purpose is the creation of a global decentralised multimedia services in enterprises, ISPs or community networks. We present a study of the routing performance and routing state in the particular case of a two-level distributed hash table hierarchy that uses Kademlia. The study is supported by an analytical model and its validation by a peer-to-peer simulator.

Adaptive quality of service management for next generation residential gateways

The TISPAN workgroup inside ETSI is currently working on accommodating the IMS (IP Multimedia Subsystem) architecture, which has been created for the mobile world, to the fixed scenario where there is a new important element to be taken into account: the Residential Gateway (RGW). This element is typically considered as a customer device where providers do not usually have anything to configure. However, in order to achieve real end-to-end Quality of Service (QoS) this cannot be true anymore. This paper focuses on the way that a RGW is capable of configuring itself (an interface with the providers is also available), regarding Quality of Service parameters, into a Next Generation Network (NGN) scenario. The proposed RGW architecture is also flexible enough so as to adapt the QoS management mechanism to different possible scenarios, e.g. configured by the provider, by the customer or even autoconfigured by the RGW itself. A specific scenario, where a RGW is deployed in the TISPAN NGN architecture, will be explained and validated to proof the concept of the RGW architecture.

A broadcasting enabled Residential Gateway for Next Generation Networks

To date, broadcasting traffic data represents a low percentage of the total traffic in the Internet when compared to other kinds of information. This may be caused by difficulties with multicast transmissions (i.e filtering by ISPs), low bandwidth rates in the last mile access, quality of service (QoS) and the use of Network Address Translation (NAT) boxes in SMEs and home offices (SOHOs). Research efforts in Next Generation Networks (NGN) are under way to create networks with true triple-play capabilities to overcome these problems. Several standardisation bodies like ITU-T and ETSI have working groups aimed at developing a general NGN architecture able to transport any type of traffic with an associated QoS. There are several results available (for example, ETSI TISPAN has published its Release 1) but there is still on-going work on different subjects, such as broadcasting transport in NGNs, where ETSI TISPAN has approved the study of IPTV in NGN as a high priority issue. This article focuses on the problems and solutions of a flexible, easily upgradeable broadcast enabled RGW (Residential Gateway) designed to work in an NGN scenario where multicast traffic, NAT boxes and QoS must be taken into consideration.

IMS signalling for multiparty services based on network level multicast

The standardization process of the UMTS technology has led to the development of the IP Multimedia Subsystem (IMS). IMS provides a framework that supports the negotiation of the next generation multimedia services with QoS requirements that are envisioned for 3G networks. But even though many of these services involve the participation of multiple users in a multiparty arrangement, the delivery technology at network level is still unicast based. This approach is not optimum, in terms of transmission efficiency. In this paper, a new approach is presented proposing to use a network level multicast delivery technology for the multiparty services that are signalled through IMS. The main advantages and drawbacks related with this new approach are analyzed in the article. Finally, as a starting point in the development of the presented solution, a new SIP signalling dialogue is proposed allowing the negotiation of a generic multiparty service, and supporting at the same time the configuration of the corresponding network level multicast delivery service with QoS requirements that will be used in the user plane.