On-demand multicast is used on efficient delivery to multiple receivers requiring the same content or media asynchronously. This paper discusses cost efficient reliable on-demand multicast strategy involving access router support, which is designed to be used for mobile users in converged Internet infrastructures. State-of-the-art of on-demand multicast techniques and metrics for evaluation of the efficiency of multicast transport are overviewed. Design and implementation of a new reliable on-demand multicast strategy is presented and its retransmission costs are evaluated for different mobile multicast scenarios.
Policy based resource management for QoS aware applications in heterogeneous network environments
(2007)
Dynamic configuration and adaptation of resources for QoS-aware applications in heterogeneous access network environment (UMTS, WIMAX, WLAN DVB-T, DVB-H) using automated tools is a challenge today. The focus of this paper is a toolkit for intelligent management of resource allocation in heterogeneous network infrastructures based on policies of different actors (network operator, service providers and users). Policy based management of resources for QoS-aware applications (Video-on-Demand, Mobile TV) dependent on network capabilities, context learning and preferences of the policy actors is proposed, which enhances the current state-of-the-art and IETF standardisation. The policy management toolkit includes components for policy specification, adaptation and enforcement, which are interacting using policy repository. The design allows the automated resource adaptation for QoS based applications based on context information and hierarchical dependencies of policy actors. A learning component is integrated in order to discover the context considering measurement and monitoring data. The policy management tookit is discussed, emphasising on ontology driven policy repository design, context learning and flexible scenario-oriented management interfaces for policy specifications.
Mechanisms and protocol interactions for seamless handover of mobile multicast/broadcast services using unidirectional access networks in heterogeneous Mobile IP infrastructures are discussed and proposed. QoS based applications, such as content delivery, mobile TV, carousel and reliable downloads, requiring interaction channel, are considered, as well as recent standardization efforts for converged broadcast and mobile IP infrastructures. The proposed mechanisms are aimed to support handover of interactive mobile services using unidirectional broadcast media (DVB-H) combined with bidirectional mobile access technologies (UMTS, WLAN,WIMAX) in heterogeneous Mobile IPv6 environments. In particular, the focus is:- Enhancement and interactions of link layer tunnelling mechanisms (IETF RFC 3077) for provisioning of bidirectional connectivity in heterogeneous Mobile IP environment;- Access network selection and intelligent handover mechanisms based on IEEE 802.21 for services using unidirectional networks;- Proactive resource management for interactive services using unidirectional access networks.
Typical for the content on-demand applications, such as video-on-demand, IPTV, on-demand advertising, music on-demand, on-line gaming, is the requirement for large bandwidth and QoS guarantees. In order to provide efficiently content delivery on-demand within fixed/mobile broadband infrastructures, QoS management interfaces and tools are proposed, which are aimed at bandwidth planning and resource reservation in advance considering dynamic QoS/SLA agreements. This paper discusses strategies and tools for automated bandwidth planning of on-demand content delivery. Based on policies for handling of on-demand services with advance reservation, the Telecom providers can improve the usage of Internet resources and enhance the QoS provision
Reliable multicast transport services for content delivery in heterogeneous mobile environment
(2007)
For efficient deployment of new reliable multicast applications in heterogeneous mobile Internet environments, appropriate retransmission strategies are proposed. The focus is the minimization of the protocol overhead for reliable transport taking into account behaviour in mobile networks (oss and handover behaviour) and application requirements (such as carousel file transfer, one-to-many download and media streaming combined with recording). The proposed techniques are designed as building blocks for localized multicast error control supported by access routers. Considering IETF RMT standardization work, the discussed retransmission approaches can be used for flexible configuration of tree-based reliable multicast protocols in converged wired and wireless Internet environment. The implementation developed for the European project DAIDALOS [1] is based on Linux IPv6 environment. Simulations in ns2 focusing on the benefits of the proposed multicast retransmission schemes for particular application scenarios are presented.
With the rapid advances in multimedia content delivery technologies, there is an increasing challenge for efficient Quality of Service (QoS) based multicast transport in mobile Internet environment. This paper discusses architectural approach for provision of multicast services in heterogeneous mobile IPv6 environment using context transfer. Following issues of QoS based mobile multicast transport are addressed: - Application of context transfer between access routers for seamless handover of active multicast services; - Adaptation of multicast group management and routing designed for wired IPv6 infrastructures to heterogeneous mobile environment; - Candidate access router discovery and context aware user interfaces for optimised handover; - Reliable mobile multicast for content delivery supported by context transfer at access routers; - Distributed QoS management of multicast services in heterogeneous mobile environment. The work is part of the mobile architecture developed in the EU IST project DAIDALOS.
