Project Number: FP6-IST-507554 Project Title: BROADBAND in ...

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FP6-IST-507554/JCP/R/Pub/D2.2-3.2
flow QoS description, which allows to support both an Intserv and diffserv type of architectures in the access
network (a mapping between RSVP QoS parameters, and the MAC layer QoS parameters is defined).
Multicast connection and mapping with IGMP are also described at the MAC level; furthermore the standard
includes layer 2 unicast and multicast encryption and authentication tools to ensure subscriber privacy, and
prevent terminal cloning.
Security is therefore supported both for unicast and multicast sessions.
The requirement for evolving the standards are a higher capacity downstream (200 Mbps +) and upstream (100
Mbps +), in order to accommodate video related services.
7.2.2.2.3 IP architecture
A complete IP architecture (Figure 11) is defined in the access network for voice communication, and could be
extended in general to multimedia services requiring QoS.
Signalling is based on a centralised architecture and thin client model (MGCP), and mostly applicable to
telephony services. 2 QoS models are defined: the most applicable one (called dynamic QoS) relies on Intserv,
and define the access QoS architecture using RSVP, or more generally a per flow resource reservation. Another
variant assumes a diffserv architecture. COPS is the protocol of choice for communication between the CMTS
(Or Access Node) and the CMS for policy and authorisation purpose.
Interdomain signalling defines SIP or H248 for signalling between different domains; interdomain QoS is
obviously not precisely defined yet, but some recommendations exist.
This centralised architecture is well adapted to a telephony case, but not really scalable to multimedia.
Figure 11: IP-architecture for cable networks