Admission control is a key component in multimedia servers, which will allowthe resources to be used by the client only when they are available. A problemfaced by numerous content serving machines is overload, when there are too manyclients who need to be served, the server tends to slow down. An admissioncontrol algorithm for a multimedia server is responsible for determining if anew request can be accepted without violating the QoS requirements of theexisting requests in the system. By caching and streaming only the data in theinterval between two successive requests on the same object, the followingrequest can be serviced directly from the buffer cache without disk operationsand within the deadline of the request. An admission control strategy based onPopularity-aware interval caching for Prefix [3] scheme extends the intervalcaching by considering different popularity of multimedia objects. The methodof Prefix caching with multicast transmission of popular objects utilizes thehard disk and network bandwidth efficiently and increases the number ofrequests being served.
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