QoS for Fixed and Mobile Ultra-Broadband

2Internet QoS

The Internet was created to provide only best‐effort services, which means that every connection is admitted into the network and every packet is transferred from source to destination with the best effort by the network, and without any guarantees regarding quality of service.

However, from the beginning the Internet designers allocated for QoS support even in the fundamental Internet Protocol in both versions, IPv4 (IP version 4, which is also simply referred to as IP) and IPv6 (IP version 6). That was done because it was known that different type of media such as audio, video, and data, have different requirements on certain quality metrics (bitrate in downlink and uplink, delay, losses, etc.). Those protocols are standardized by the IETF, the main standardization body for Internet technologies (i.e. it includes protocols and architectures from the network protocol layer up to the application layer, which are used in hosts and nodes attached to the Internet network).

Since the beginning of the twenty‐first century the whole telecommunication world has been transiting to the Internet as a single networking platform for all telecommunication services, including native Internet services (e.g. Web, email) and traditional telecommunication services (e.g. telephony, television). That makes for different QoS techniques which are standardized for legacy telecommunication networks (e.g. PSTNs) to be implemented in a certain manner in IP networks (here, an IP network is ...