The purpose of this document is to define a framework for an Access Node Control Mechanism between a Network Access Server (NAS) and an Access Node (e.g., a Digital Subscriber Line Access Multiplexer (DSLAM)) in a multi-service reference architecture in order to perform operations related to service, quality of service, and subscribers. The Access Node Control Mechanism will ensure that the transmission of the information does not need to go through distinct element managers but rather uses a direct device-device communication. This allows for performing access-link-related operations within those network elements, while avoiding impact on the existing Operational Support Systems.

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Next to higher bandwidths, the access network must support quality of service (QoS) features including traffic differentiation, policing, queuing, and scheduling in order to prioritize video and voice services over best effort services, such as Web browsing.Even with access networks based on VDSL2, resources on the access link (the first mile) and the access node uplink (the second mile) remain rather limited. To protect the first and second mile against cases of network overload, admission control functionality can be used. This paper focuses on the notion of resource admission control (RAC) as a means to protect services from quality degradation in cases of exceptional loading conditions. It describes a number of scenarios explaining how to perform RAC for broadcast Internet Protocol TV (BTV) and video on demand (VoD).

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