Applications & Services in Wireless Networks by Hossam Afifi, Djamal Zeghlache

By Hossam Afifi, Djamal Zeghlache

Fresh advancements to instant networks convey with them the questions of provider deals, provider administration, provider keep watch over, and caliber of carrier which are tested during this number of views on rising instant applied sciences.

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Presence. 323 Systems”. 0 Annex G. g. RADIUS or DIAMETER servers, charging, billing and policy servers). 323 systems alone. 323 and mobile networks”, it introduces necessary functionality that may be needed for user, terminal, service and service provider mobility. This includes specifying the necessary functional entities, the appropriate interfaces between them, and suitable protocols that may be used within an interface. 323 systems. 323 systems. 323 systems. In addition, any new functional entities that may be needed for this purpose will be introduced.

Using this API a QoS management application can be developed that is able to configure a heterogenous network via high-level configuration commands and abstract flow descriptions. A mobile user might visit several access networks managed by different ISPs, but he needs to get a certain service wherever he is connected. Since the user has negotiated a Service Level Specification (SLS) with his home-ISP only, this SLS has to be transformed and transmitted to the foreign networks the mobile user visits.

Solutions to the frequent handover problem To avoid the overload of the call processor and to provide seamless connectivity to mobile users in micro- and pico-cellular environment, several techniques were proposed. 1. Virtual Connection Tree The idea of the Virtual Connection Tree (VCT) [ANT 94] offers a solution for the problem caused by the increased frequency of handovers due to reduction of the cell size. This concept allows the use of very small cell sizes that results in improved spatial frequency reuse and a reduced number of CAC procedure caused by handovers.

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