lish and maintain multiple connec- tions simultaneously. The network will also allow efficient cooperation between applica- tions with diverse quality of service (QoS) requirements, as well as adaptive applications that will function within a wide range of QoS settings. From the users' perspective, third- generation networks will be able to give high quality for many services. This means that all the sections of the network RAN and CN will be trying to achieve these quality standards (from the users' perspective and defined by the ITU). The quality can defined by two main parameters: guaranteed and maximum bit rate (kbps) possible permissible delays (ms). Both single-media and multi-media services will be handled in the third-generation networks. Based on the QoS criteria, multi-media services have been further classified as: conversational streaming interactive background. The conversational class, as the name suggests, is for applications like speech. It is the most delay-sensitive of the four classes. A typical example of this class is video tele- phony, voice-over-IP (VoIP). In this class the delay is based on the human perception of the application, hence has strict requirements for quality. The streaming class refers to traffic flow that is steady and continuous. It is server-to-user type. The most common example in this class is the Internet. In 3G networks, the Internet will be faster because a user will be able to see data before it is completely downloaded. There are two components of this class: messaging and retrieval. A typical example is downloading of streaming videos (e.g. news). Web browsing is a typical example of the interactive class. In this case the user requests data from a remote entity (e.g. a server). Location-based services are an example of this class. A user will be able to access information like bus and train timetables, flight schedules, and any local data that might be useful. Short messages, file transfers, etc., come into the background class. Nearly all the traffic that does no