6Services in Fixed and Mobile Ultra‐Broadband

The main legacy telecommunication services from the twentieth century are telephony and television. In the beginning they were provided via separate networks such as telephone networks for telephony (e.g. PSTN/ISDN, PLMN) and broadcast TV networks (for television). However, the convergence of all telecommunication networks onto IP networks has triggered the transition of legacy telephony services to VoIP and the transition of television toward IPTV (although this lags behind VoIP because TV requires far more bits per second to be transmitted with desired QoS). Besides legacy telecommunication services, the twenty‐first century provides a plethora of new services enabled by IP networks and Internet technologies, which has paved the way for deployment of new services without a need for change of the underlying network infrastructure. However, some services are provided with QoS support, while others (e.g. Internet‐based services) are provided in a best‐effort manner. With the deployment of ultra‐broadband access, the difference between the two types of services (with and without QoS guarantees) becomes smaller, especially when broadband speeds are sustainable between end‐users and other end‐peers (e.g. servers) with which users communicate (also, the user can be a human or a machine on both ends, which depends upon the service type).

6.1 QoS‐enabled VoIP Services

By definition, VoIP refers to provision of voice communication service ...

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