The service quality of multimedia communication system, which satisfied the user application requirement into communication system is quality of service it is a concept foe specifying how “good “the offered, networking services are. QOS can be characterized some of them are:
It determines a type of service on the basic of connection less and connection oriented services they are:
1. QOS layering:
The multimedia communication system consists of three layers application, system (including communication service and OS service) and devices ( network and multimedia devices) given the applying may or might not reside an individual's user that's QOS of those 3 layers influence the standard of service of multimedia communication systems(MCS).2. Service object:
Service is performed on various object as media sources, media sinks, connections and virtual circuits (VCS). QOS parameterization specific these service objects.3. QOS description:
it's meant for service and processing a transport or network connection, it includes 3 parameters:a) Application QOS parameter:
It describes the wants for the applying services laid out in terms of media quality and media relations.b) System QOS parameters:
It describes requirement on communication services and OS service in term of bits per second, number of errors processing time, size etc.c) Network QOS parameters:
Describes requirements a network service in terms of network traffic (load) and network performance4. QOS parameters value and types of services:
a. Guaranteed:
Provide QOS guaranteed by single value (target value or average value) or a pair of values (mean and average value/ lowest quality and target quality).b. Predictable service (historical service):
It based on past network behavior by matching past service quality, predicts current QOS.c. Best effort service:
it is based on either guarantees or on partial guarantees most of the current networks protocol have best effort services.
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