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Live Streaming Over 4G

Dec 12, 2012 3:52 PM, By Jan Ozer

Three broadcasting setups to get you started.

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Implementing 4G

If your clients decide to broadcast via 4G, you can recommend one of three basic options: First, they can buy a 4G modem from a local service provider and plug it into their existing encoder, if it’s compatible with 4G. Second, they can buy a link aggregation device that combines multiple 4G modems, including those from different networks, to aggregate performance and ensure coverage. This, too, they would plug into their existing encoder, if compatible. Finally, they can buy a complete system that combines both encoding and cellular aggregation, which is the most expensive, but also the most robust option. Let’s discuss each in turn.

Teradek Bond

Teradek Bond

Link Aggregation

A single 4G modem attached to an encoder provides a single 4G connection over the selected carrier directly to the streaming service provider. Given the average connection speeds reported by PC World for AT&T and Verizon, this could work very well depending on location and other variables like time of day. However, your client is depending on a single carrier and a single connection.

In contrast, link aggregation devices, like the Teradek Bond ($2,490) can host up to five 3G or 4G modems, including modems from disparate 4G networks. When one or more modems are connected, Bond can aggregate the connection speeds into a single high-bandwidth transmission, enabling higher quality than any single connection could afford. The ability to access 4G connections from different vendors, of course, enables broader 4G coverage and provides backup if the throughput from any single vendor is limited.

Unlike 4G modems, which transmit point to point to the streaming service provider, link aggregation devices like Bond transmit to a server that assembles the disparate feeds into a single stream and can transmit that to the streaming server. For this, Teradek offers a server called “Sputnik” that your client can run on Amazon’s EC2 services or on a local Linux server.

LiveGear AirStream

LiveGear AirStream

Aggregation Solutions

The third alternative is to use a combined encoding/
aggregation solution. For example, your client could buy the Teradek Cube, which starts at $1,940, to pair with the Bond, or a combined encoder/aggregation device like the LiveGear AirStream LGT-1000 (prices start at $15,000). Slightly larger than the Teradek product, the AirStream features both a longer battery life and onboard preview, a valuable feature when livecasting remotely.

These combined encoding/transmission systems offer the expanded coverage and higher bit rate potential of link aggregation devices. In addition, since the encoder and 4G transmission unit are integrated, the system can adjust parameters like data rate and resolution as actual throughput changes, maintaining the highest possible quality at all times. In this regard, while your clients may be able to use existing encoders, if compatible, using an integrated system that can maximize quality over the duration of the event will enhance the overall experience.

Any of the three alternatives will allow your clients to greatly expand the range of live videos streamed to and fro their organizations, enhancing the experience for shut-ins and others who can’t make the trip. Still fairly exotic at this juncture, expect these capabilities to become mainstream over the next 12 to 24 months.

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