10.2 Generic Inter-networked QoS-optimization Infrastructure
Third-generation and beyond radio access technologies promise deployment in diverse environments, better quality and coverage, and more power and bandwidth than is possible in present systems, potentially enabling advanced multimedia communications in a cellular system. However, in order to realize widespread use of multimedia applications, several challenges remain to be addressed. A fundamental question is how to provide adequate QoS for multimedia applications, taking into consideration the effects of user mobility, cell handover, network handover, and so on. This section investigates the important issues of QoS provisioning for multimedia traffic transmitted over heterogeneous wireless networks with adaptive QoS support and with the characteristics of the application taken into consideration. First, a brief overview of recent developments in QoS provisioning in mobile heterogeneous networks, enhancing the multimedia quality received by end users, is provided. Second, the design of a generic inter-networked QoS optimization infrastructure for multimedia delivery over heterogeneous networks is described.
10.2.1 State of the Art
In order to provide QoS in mobile heterogeneous systems, many issues must be addressed. Consider a user moving from one network to another. The user may interact with a variety of service providers with different service level agreements, network capacities, topologies, and policies. They may ...
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