Having to accommodate a wide range of services with very different mobile recharge api characteristics, it is essential that the UMTS network associate to each of them a certain quality of service (QoS) that allows to uniquely identify the requirements of the shipping service (radio bearer) from use. 

 

In defining the different QoS in UMTS is necessary to take into account on their radio interface, which require the introduction of appropriate recharge price mechanisms to ensure the required QoS. Are defined four classes of quality of service according to the sensitivity to delayed transfers: Conversational class: class is more sensitive to the time of transfer, and is used for the transport of real-time traffic.


 

One of the best known uses of this class is the telephone, but with mobile recharge api the development of the Internet and multimedia services, a wide range of new applications fall into this category, such as the transport of voice over IP and transfer of images and audio (video conferencing). 

 

The main services of the 'conversational class' then consist of communications between two or more persons; just for the fact that the quality requirements are strictly recharge price determined by human perceptions, they should be subject to more stringent constraints than to notify all other classes of service quality. In fact, the main features of the 'conversational class' are the low transfer mobile recharge api delay, the limited variation of it and maintaining the temporal relations between the various entities that make up the data stream.

 

Streaming class: This is used for the transport of a data stream and unidirectional real-time video that both type of the audio type. This class, like the 'conversational class', is characterized by the maintenance of the temporal relationships between the various entities that make up the flow of data and a limited variation of the delays of the flow end-to-end. The variation allowed for transfer delays, however, turns out to be much larger than that given by the limits of human perception, and then from that required in the previous paragraph.
 

 

Interactive class: is applied to the case where the end user requires mobile recharge api data to a remote apparatus. Examples include web browsing, searching the database and access to a particular server. This class is characterized by the fact that the end user waits for a message in response to the carried recharge price apparatus remotely.

It is therefore of primary importance the round trip delay that must be contained in a reasonable time; also requires that the data transfer mobile recharge api is transparent, with a low error rate. Background class: is used in the case where the end user, typically a computer, is in. Examples include the use of e-mail, or the sending of SMS and download files from the database.

 

For this class is important to underline recharge price the fact that the user does not have the need to receive data in real time, and therefore is less sensitive to the time of delivery. On the contrary, the background class requires maximum reliability and integrity on the mobile recharge api transmission of data and therefore requires a low error rate. While the first two classes are suited to carry real-time traffic, the last two are the most suitable for the traditional Internet applications such as WWW, e-mail, FTP, Tel net, etc.