NextGen TV Marks Vegas Debut

LAS VEGAS-NextGen TV took a major step forward with the launch of ATSC 3.0 over-the-air commercial television service in Las Vegas from network affiliates owned by Sinclair Broadcast Group, Nexstar Media Group and The E.W. Scripps Company.

The stations, Sinclair's KSNV NBC and KVCW CW affiliates, Nexstar's KLAS CBS affiliate and Scripps' KTNV ABC affiliate, are sharing a single 6 MHz channel and transmitting from Sinclair's tower on Black Mountain outside the city. The launch is significant because it is the first full-power, multistation commercial deployment of NextGen TV in the country. BitPath, formerly Spectrum Co, led the planning and coordination efforts to put the stations on air.

Mark Aitken, Sinclair vice president of Advanced Technology and president of ONE Media 3.0 LLC, discusses the Las Vegas 3.0 launch, the cooperation among competing broadcasters needed to make it happen and what the rollout means more broadly for NextGen TV deployment and to him personally.

(An edited transcript.)

TVTechnology: Congratulations on the NextGen TV commercial broadcast rollout in Las Vegas along with Nexstar and Scripps.

Mark Aitken: Let me tell you, in the midst of COVID-19, this has been a fairly monumental task to pull this off.

(Image credit: Mark Aitken)TVT: How have you managed to do that during the pandemic?

MA: The fact that we have been able to get this together in the midst of a pandemic without the deployment of additional resources is remarkable. We have not flown anybody into or driven into the market. We are using on-ground personnel.

We are using ready-baked solutions. For instance, when it comes to video distribution, we've gone to LTN. When it comes to switches that allow the flow of IP packets as relates to ATSC 3.0, it's conventional Cisco gear. We've got cloud-based solutions that are being played out and ready-made hardware. We've done all of this without deploying additional in-market resources.

TVT: Tell me about the setup. Is NextGen TV being transmitted from a Big Stick or via a single frequency network (SFN)?

MA: We are making accommodations for an SFN in the near future. Actually, those efforts were underway for NAB, but lack of hands on ground due to the COVID-19 outbreak sort of postponed that.

So it's our Big Stick. We are converting our primary station in Vegas, KSNV, the NBC affiliate, to 3.0 and we are doing channel shares with Scripps and Nexstar in the market.

TVT: How are you allocating the bits among the three broadcasters' four ATSC 3.0 channels?

MA: You know, that's a question that comes up in every one of the channel-sharing/host-station discussions. In the days when you had just one stream and it was a transport stream, it was fairly easy to say, We are going to give you X amount of bits as your capacity. And you would multiply those inside your transport stream.

Because of 3.0's multiple operating modes, it really comes down to what we call spectrum utilization. You have fundamental, sort of atomic, building blocks for all of the standards, and there's a finite, fixed amount of those that are referred to as samples. You have a sampling rate.

So, we look at the spectrum and in a certain sense, we are saying to all four partners, You're going to have an equal share of that spectrum capacity. Choose your operating mode.

The operating mode is chosen, and that yields X amount of bits. Three of the four are sharing one physical layer pipe [PLP] and the yield to each of them is on the order of 6-plus Mb/s.

That is the level of service that closely approximates ATSC 1.0 in receivability over the air. Then there is one PLP for the NBC, which is operating in a robust PLP with lower signal-to-noise requirements and is aiming to be received both in the conventional over-the-air environment as well as by portable and nomadic devices.

There are so many issues. The carrier-to-noise is one of those issues. Doppler is another. There are all of these interrelated components.

By the very nature of 3.0, it will be possible to view on a portable and nomadic basis. But all of these channels within the Las Vegas market will be viewable on simple handheld, portable and nomadic devices.

There is an extra level of robustness for the NBC station. That station is operating at about 8dB better C/N performance.

PLUS: ATSC 3.0 Deployments: Where and When Will NextGen TV Be Available?

The NBC channel is taking the NBC mezzanine level standard 1080i feed, and with professional equipment is being converted to 1080p with sampling conversion to HDR via SL-HDR1. So the NBC programming will actually come across with TV sets that support HDR and SL-HDR1. Those devices will display HDR.

Devices with an ATSC 3.0 receiver but standard dynamic range are capable of receiving the signal and displaying content.

TVT: Are Nexstar and Scripps also doing 1080p?

MA: The networks are not providing extended content, so not everybody is taking the best feed that is available to them, which is typically a mezzanine level, high bitrate AVC that's being converted to HEVC.

TVT: Tell me about BitPath's (formerly Spectrum Co's) role in working with these competitors to bring about an agreement to share a channel for 3.0 service and accommodate the 1.0 channels displaced by 3.0 rollout.

MA: They were the driving, coordinating force in the hosting agreements for all of the participants. And we prefer to think of them as hosting agreements. So BitPath is preparing the way to engage multiple broadcasters-and this has always been the business plan.

TVT: Where do you go next after the Las Vegas rollout?

MA: This is the first of many. We have a cascading series of launches. Next month, we are looking at Pittsburgh and Salt Lake City. Directly on the heels of that, we've got Nashville. So, June is going to be

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