With convergence coming is place soon, IP seems to be the best way forward. The best thing about IP Network in India in they that can be built by Telcos, ISPs, WiMax operators as well as Cable TV Operators. This article explains the basic concept and methodology of building an IP Network Services for Quadruple-Play.
Charles Dickens once wrote, "Change begets change. Nothing propagates so fast... and what rock was before becomes but sand and dust." Although Dickens could never have imagined what the world would look like 150 years after he wrote those words, the sentiment must ring especially true to the present-day service providers who are seeing their industry transform virtually before their eyes.
Today's providers of voice and data services, wireless services, and television built hugely successful business models around delivering one or two services extremely well. However, service providers now recognize that the days of delivering voice, video, data, and wireless services as distinct offerings, with each delivered over its own network, accessed using its own device, and billed as a single subscription, are rapidly fading away.
To succeed in the future, service providers will need to deliver all types of rich media to all subscribers. Even more important, they must develop the capacity to deliver media to a wide range of fixed and mobile devices and be able to provide a consistent, high-quality experience across all environments. Ultimately, they must transform from traditional providers of access based services to"allinclusive experience providers" that can offer the full quadruple play of voice, video, data, and mobile media to subscribers anywhere, anytime, on any device. Although traditional wire line service providers have well-developed strategies for delivering voice and Internet/data services successfully, video represents an entirely new challenge and more complex proposition. However, it is ultimately the video experience that will promote and differentiate the offering in tomorrow's quadruple-play marketplace. Although today's cable operators currently have a head start in video services, the reality is that the changing media landscape will present new challenges to the'm as well, as subscribers demand new types of rich media experiences that go beyond the capabilities of today's cable video infrastructures. Cisco envisions a future in which subscribers use service providers' media networks in the same way they use the Internet today as a fully interactive environment. In this paradigm, passive (and even basic on-demand) viewing of video entertainment will be supplanted by myriad next generation CT applications that the service provider will have to support. Indeed, in tomorrow's media landscape, video will be the prevalent type of content used in a broad range of interactive, user-generated, and community-oriented applications that subscribers will expect their service providers to support.
What do service providers need to understand in order to create a differentiated media experience and build a robust, highly scalable foundation for delivering the applications of tomorrow? From a top-level, end-to-end system standpoint, the answer can be broken down into the following distinct but complementary domains:
Service providers need tools to effectively define the media experience in the headend and content-on-demand system (CDS).
Then, the service providers have to preserve that experience as it is delivered to the subscriber over the intelligent Internet protocol (IP) network.
Finally, the service providers have to realize that experience exactly as intended in the customer home.
Each of these domain requirements present-its own unique challenges. However, at Cisco, we believe the way to address all of them lies in building an intelligent, media-aware service network that can integrate many types of content and services into a single,
comprehensive, end-to-end system based on the intelligent IP network infrastructure (Figure 1).
Figure 1: Define, Preserve, and Realize Domains
Defining the Media Experience
The media experience initiates and ultimately is defined in the service provider's headend and CDS. The video headend is the defining factor for the visual aspects of media experience that is complemented and enhanced with the "interactivity" aspect of CDS. In the define domain, service providers need the following proven technologies and strategies for media content:
• Content Delivery
Service providers have to use broad expertise to help ensure that analog, digital, and IP technologies closely interoperate to produce.the desired quality of experience (QoE) end result. Achieving this is no small task, especially for wireline carriers embarking on video services for the first time. Video headends encompass a wide range of technologies and formats and demand a wide range of skill sets spanning the whole spectrum from the latest Moving Pictures Experts Group (MPEG) encoding to radio frequency (RF) technologies.
Video acquisition alone can encompass satellite, off-air, and fiber sources, each using its own format and encryption protocols. The acquired heterogeneous media content must be decrypted, converted, and multiplexed into a single video service, which is a complex challenge that requiresmany components to work together. Since every service provider offers its own menu of channels and services, with each requiring a unique mix of technologies, the video acquisition component of the headend must be built from the beginning as a customized solution. For the most part, the headend must be designed, tested, and assembled as a customized solution for each service provider, depending on the specific mix of content and services that will be delivered.
The acquisition segment must be designed with the appropriate redundancy and backup capabilities needed to satisfy the service provider's uptime goals, which can be quite stringent considering the centralized nature of the quad-play video headends.
Processing media for distribution has become a particularly complex challenge. In the past, when all subscribers accessed similar types of media on the same type of device, the process was relatively straightforward. Today, the situation has changed significantly, and in emerging quadplay environments, subscribers might be just as likely to access content from a three-inch wireless phone display as from a 100-inch high-definition television. Service providers need state-of-the art capabilities for transrating and transcoding capabilities to optimize content for any format or screen size and provide a consistent high-quality experience regardless of the way media is accessed. To create a more profitable offering, most service providers also want to build capabilities for targeted, even personalized, ad insertion, which might require real-time muxing and remuxing of thousands of simultaneous streams from a variety of sources, further increasing the complexity of media processing.
Using the right tools to encode media especially video is the most important part of the "define" domain. More than any other factors, it is the video-encoding technology, especially the implementation of that technology, that determines the quality of the media experience. As demand for high-bandwidth content, especially high-definition video, continues to increase rapidly, many service providers are turning to MPEG-4 advanced video compression (AVC) encoding, which requires approximately half the bandwidth of the MPEG-2 technology long used in the existing networks. However, MPEG-4 AVC encoding is an extremely complex process encompassing a much larger set of variables than MPEG-2 algorithms. In addition, MPEG-4 high definition is extremely sensitive to high motion, noise, and rapid luminance changes. Two providers might use the MPEG-4 AVC format to encode the same media source, but depending on the brand of the encoder, the end results subscribers see might be sharply different.
As subscriber expectations for accessing and interacting with media evolve, service providers are turning to new media distribution platforms that deliver more personalization, localization, and on-demand access. However, modern media services such as time-shifted television, personalized ad insertion, and network-based digital video recorders (DVRs) place huge demand on media networks. Service providers need distribution systems that can ingest, store, manage, personalize, and stream vast amounts of content from anywhere on the network and help ensure that all content is available instantly to any subscriber, anywhere.
Many service providers currently have video-on-demand (VoD) distribution systems in place that actually function effectively as large, centralized video servers. These systems can provide a good solution for basic VoD applications, but they have inherent limitations that prevent them from being ideal distribution platforms for tomorrow's quad-play services. Most notably, they are difficult to scale as the subscriber base and content library grow.
It should also support the full range of emerging media content and applications, not just deliver video to televisions. The system should dynamically bring up and take down new content storage and streaming resources to enable content distribution according to real-time calculations of each title's popularity. Finally, since service providers might need to address many markets and cannot predict how demand will grow, the system should provide the flexibility to serve very large communities, very small communities, and everything in between.
Any successful media distribution strategy also must include intelligent middleware and digital rights management (DRM) solutions to allow subscribers to easily access and legally share media. With middleware and DRM technologies constantly evolving, service providers do not want to get locked into a single strategy. Instead, they should take an open, standards-based, and flexible approach that allows for continuous innovation.
Because of the broad mix of technologies and applications in the headend, service providers will also want to make sure they have management tools that allow them to monitor and control all heterogeneous components from a single system and, ultimately, from a single screen. Since many video hubs do not have on-site staff, carriers must be able to manage all solutions across the service network-including third-party devices remotely.
Building and operating a video headend effectively require significant rich-media expertise that delivers full, automatic redundancy with autonomous management of backup and failover routines with routing control of each video stream. Finally, a significant aspect of video management is performance data collection and recording from all network elements as well as performance and trending reports about network availability and performance.
Preserving the Media Experience
The quality of the media experience is defined in the video headend and CDS, but service providers need a quadruple-play network capable of preserving and sustaining that experience and delivering it to subscribers exactly as intended. To do that, the network needs to possess "application-aware" intelligence to distinguish content types and handle each accordingly. The network also must be simple to operate, scale to millions of subscribers, and provide a range of video-specific capabilities, including rapid channel change times, end-to-end video quality experience (VQE), and robust security.
For many service providers, this means adopting an IP-based media approach that can apply IP intelligence to identify and separate types of traffic. IP offers other advantages such as the ability to preserve bandwidth across the network by employing IP quality of service (QoS) techniques to deliver media only to those subscribers who specifically request it. By integrating IP-based content-aware and subscriber-aware intelligence into the network, service providers can also have better controlling, monitoring, and billing of services.
Subscribers might have their own subjective standards for judging the quality of the content they view, but the standards by which media delivery networks are measured are quite specific. For video, the most rigorous media application, the industry standard allows for just one artifact per two-hour movie, which translates to an overall network packet loss of just 10-6.
Most video artifacts are caused by brief network outages, so service providers will want a network that uses state-of-the-art resiliency and convergence strategies to achieve sub-second recovery times regardless of where on the network the outage originates.
Finally and most important, the delivery network should be a true quadruple-play infrastructure not just a consumer video network. Most service providers recognize that the most competitive service offerings of tomorrow will bundle voice, data, video, and wireless services and provide an integrated media experience that draws on all of them. Unless service providers want to operate separate networks (and maintain separate management and billing infrastructures) for voice, video, wireless, and business and consumer broadband services, they need a network that converges all types of media over a single infrastructure and can deliver any service to any market over any device.
Realizing the Media Experience
The final component in delivering a compelling media experience is the most important because here the content directly interacts with the subscriber and the experience is re-created though the ears and eyes of the consumer, and a set-top box or mobile video device must deliver an undistorted high-fidelity rich-media experience. If subscribers' in-home and mobile devices do not provide the quality and features needed to fully realize the experience, the "define" and "preserve" segments of the quad-play system will be irrelevant.
Service providers must be able to offer consumers high-performance, easy-to-use options and an intuitive GUI for accessing and consuming media content, both in the home and on the go. Inhome set-top boxes are the subscriber's gateway not just for video, but also for the delivery of rich, interactive media experiences. Set-top boxes also must be easily upgradable to allow service providers to make continuous enhancements to the media experience over several years and must support robust remote management capabilities.
Building a Media Platform
Clearly, the processes of defining, preserving, and realizing the media experience will draw on very different strategies, each requiring unique technologies and approaches to deliver optimal results. The media networks of the future will require a holistic approach to the end-to-end system and will need to provide many types of content and services to all subscribers. With these types of requirements, using a loose-fitting assortment of technologies from multiple providers is naturally going to produce a media platform that is less efficient and more costly to own and operate. The ideal quadruple-play platform should be a true end-to-end system that provides built-in intelligence, flexibility, and scalability to support a large and continuously expanding suite of media applications. With the ability to integrate and manage all types of content and services with a single converged infrastructure, service providers have more flexibility to extend the capabilities and scale of that network over time.
Even more important, a quad-play end-to-end system will require much tighter linkages between the media content and the intelligent IP next-generation network (NGN) delivery infrastructure. Ultimately, I believe a tightly integrated end-to-end media platform using a media-aware IP NGN infrastructure offers greater efficiency and manageability across the define, preserve, and realize segments of the infrastructure and provides a more holistic, long-term approach to delivering quadruple-play services.