ATIS - Alliance for Telecommunications Industry Solutions
Scope
INTRODUCTION The ATIS IIF IPTV functional architecture is specified in ATIS-0800007@ IPTV High Level Architecture [2]. It is based on an Next Generation Network (NGN) framework with a separation of services from transport. Two approaches are specified: one using a specialized IPTV service control function; and a second approach that adds Core IMS to the service control. The IMS and non-IMS approaches use common functional elements@ interfaces@ and metadata where possible. This facilitates the coexistence of non-IMS and IMS-based IPTV service in the same network@ and the migration from non-IMS to IMSbased IPTV with minimal obsolescence. The ATIS IIF functional architecture is well aligned with the ITU-T IPTV functional architecture as specified in Y.1910 [16]. The ATIS IIF IPTV High Level Architecture is shown in Figure 1. The functions and interconnections in black are common to the IMS and non-IMS approaches. Functions and interconnections in green apply only to non-IMS IPTV networks. Functions and interconnections in red apply only to IMS-based IPTV networks. It is important to recognize that a network may offer non-IMS IPTV service but still use IMS for other services such as voice services. A network may use non-IMS IPTV service for some customers such as those that received IPTV service prior to Core IMS being deployed@ and use IMS-based IPTV service for customers with an expanded service offering@ located in a different serving area@ or using a mobile service. Coexistence of IMS and non-IMS IPTV service and architectural evolution are important considerations in the ATIS IIF. Notes: 1) Boxes with black outlines and black interconnections: common for non-IMS and IMS based IPTV service. 2) Boxes with green outlines and green interconnections: only apply to non-IMS IPTV service. 3) Boxes with red outlines and red interconnections: only apply to IMS based IPTV service. 4) The blue line is the media path. Building on the IPTV High-Level Architecture@ the ATIS IIF has produced several documents focused on particular aspects of the IPTV service@ such as network and service attachment@ and other documents focused on particular services@ such as Linear TV and Content on Demand (CoD) services. Figure 2 shows the architecture based on the Linear TV functional architecture in ATIS-0800018@ IPTV Linear TV Service [10]@ and ATIS-0800042@ IPTV Content on Demand Service [15]. The reference point designations used by the ATIS IIF align with those used by the ITU-T in Y.1910.