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Learning
About DSL
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BroadbandSuite Solution Series - IPTV
DSL Forum IPTV Related Work
Delivering an End-to-End Architecture
IPTV represents a tremendous opportunity for service providers to deliver a truly personalized service experience to their subscribers.
However, to be successful in this highly competitive environment, service providers must create an end-to-end architecture that supports
high bandwidth, multicast group management, dynamic policy-driven resource control, subscriber management, and home networking
while providing the service provider with the ability to continuously monitor and ensure the subscriber’s quality of experience.
Service providers face many challenges to successfully deliver a positive experience for IPTV subscribers. This includes managing the
growing number of video related devices in the home, managing the growing number of video streams being delivered by diverse
networks while ensuring quality of service.
Through its BroadbandSuite, the DSL Forum is addressing these important requirements to help the industry expedite the rollout and
ensure the quality of experience for IPTV. This paper introduces the work of the DSL Forum that is defining a robust architecture that spans
from the home to the access and aggregation network and includes an intelligent control plane to orchestrate the successful delivery
of IPTV. These efforts address the following key areas:
- Access Bandwidth – New DSL standards (ADSL2plus/VDSL2), DSL bonding, and PON solutions
- Multicast and VLAN Management – IGMP group management and support for multiple VLAN models
- Admission Control and QoS – Real-time topology and bandwidth awareness, providing the ability to dynamically reallocate resources to support IPTV service request; ensuring bandwidth and QoS characteristics
- Home Networking – Automated device recognition, provisioning, remote management and self diagnostics
- Quality of Experience – Measuring/Monitoring the subscriber experience, providing integrated feedback loop for real-time corrections
The following information details how the Forum’s work provides access, policy control and device support.
The BroadbandSuiteTM
[BroadbandControl]
[BroadbandAccess]
[BroadbandHome]
BroadbandControl
BroadbandControl addresses the policy control options to assure the successful delivery of resource intensive and quality
sensitive services. The successful delivery of IPTV requires the dynamic control of network and application resources. It is
imperative that an intelligent programmable control layer be employed.
WT-134 “Policy Control Framework” defines a policy information model (PIM) that enables a robust conversation between
application and network resources. The PIM creates an environment that can intelligently evaluate requests in real-time and
take action based on established business and network level policies.
For IPTV, WT-134 provides three strategic capabilities that assure successful delivery:
- Admission Control —Real-time evaluation of the initial session request to reserve bandwidth for the duration of the session
- Quality of Service—Ensures that IPTV sessions are guaranteed the correct network session parameters to provide a quality
experience for the subscriber
- Dynamic Resource Control—Empowers dynamic and automated provisioning of network resources based on the defined
business and network policies, ensuring that the most valuable sessions receive adequate resources
BroadbandAccess
BroadbandAccess defines specifications for broadband access agnostic network architectures, which deliver
inherent quality, scalability, resiliency and inter-working capabilities.
From the access perspective, enhanced speeds and migrating from ATM based access aggregation to Ethernet are key.
Examples of ways the Forum stimulates new speed options are TR-100 “ADSL2/2plus Performance Test Plan” and the ongoing
development of the VDSL2 test plans. The BroadbandAccess specifications continue to drive interoperability of equipment and
empower the rapid evolution of the network to speeds that enable successful delivery.
To provide a roadmap for providers to support the necessary architectural changes, TR-101 “Migration to Ethernet Access
Aggregation” offers recommendations for:
- Multi-service Enabled Architecture — Supporting multiple VLAN models, multicast group management, and various
business models
- End-to-End QoS Enabled Architecture —Supporting multiple QoS models – Traffic shaping at BNG, DiffServ and IP
Precedence marking, as well as hierarchical scheduling on the BNG
- Network Provisioning and Management — Providing robust subscriber identity models and well defined operations,
administration and maintenance (OAM) capabilities
BroadbandHome
BroadbandHome sets the standard for remote management of CPE in the home. With a focus on simplifying installation and
support of the variety of new multimedia devices coming online, these specifications allow the service provider to
manage home networks and IPTV efficiently.
BroadbandHome specifications establish:
- Common Set of CPE Capabilities– Ensuring devices thrive across various service providers’ networks
- Automated Device Activation and Remote Management– Simplifying service delivery and support process
- Device Interoperability– Allowing customers to choose from a larger body of multimedia devices that can be
readily supported by service providers
- Dynamic Infrastructure– Providing stable high-quality monitored IPTV transmission into the home
Specific to IPTV requirements, TR-69 “CPE WAN Management Protocol” provides the framework for management of the
set top box (STB). Coupled with TR-106 “Data Model for a TR-069 Enabled Device” and WT-135 “Data Model for a TR-069
Enabled Set Top Box”, the Access Control Server (ACS) is able to have real-time configuration and monitoring of the STB
status and statistics.
With the ACS alert to any potential problems and also having access to detailed statistics and high-level metrics,
quality of service is ensured.
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