Is powering small cells the greatest densification challenge?


CommScope director of engineering: ‘When densification [of small cells]increases […] so does the amount of power’

In the U.S., operators are expected to deploy five to 10 times more small cells than macro cells, and CTIA has forecasted that by 2026, more than 800,000 small cells will be deployed in the U.S., up from around 86,000 in 2018.

For Tom Craft, director of engineering, MetroCell Solutions at CommScope, this scale creates a problem: “Everything is focused on densification and getting services out to users, but when that densification increases by a factor of 10, so does the amount of power,” he said.

In fact, Craft believes that getting enough power reliably and cost effectively to the “tens, if not hundreds of thousands” small cells that will be deployed across the U.S. is the “biggest challenge” facing small cell densification.

Power availability for small cells

CommScope estimated in 2018 that the total time to deploy small cells is 18 to 24 months, due mostly to power constraints. According to the company, this timeline is a result of prioritizing coverage when designing new network sites, leaving power as an afterthought. Once the infrastructure design is in place and it is discovered that no electrical power exists nearby, approval to tap nearby buildings for power must be sought—a process that can take several months.

“We’re seeing today that it already takes months for the utility to get out there to turn power up on each one of those poles,” Craft continued. “And we see that problem only growing as the number of small cells increases not just from a connection standpoint, but from an operational or maintenance standpoint.”

Therefore, as these deployments go from small to large scale, CommScope is encouraging operators to pay attention to power, both from a planning and consumption perspective, and to do so early. 

A typical three-sector small cell can require 200–1,000 watts of power, according to CommScope, and small cell networks must be incredibly dense to provide adequate coverage, meaning there will need to be a lot of individual installations, and each one will require power.

Power reliability for small cells

Worse, though, is the fact that the traditional model of powering a cell site — in which the site is powered by the AC power grid, with a backup power source available as a fallback— cannot be applied to small cells, as these sites do not currently come with power backup, and therefore, would go down during a power outage.

“The AC grid is known to have outages every year,” commented Craft, adding that once in place, people will begin to rely on these small cell systems for critical communication, making such outages potentially disastrous. 

AC electrical feeds can be interrupted by a variety of anomalies from lightning strikes to blown transformers to rodent activity.

“The only way to fix that,” he continued, “is to have a centralized system that has some level of backup that keeps the system available in the traditional telecom network.”

The traditional telecom network reliability is around five nines today or 99.999% reliable, while the AC network can only claim around three nines, or 99.9% reliability.

“So, about .1% of the time the AC system is down and when the system is not available, that equates to a tremendous amount in cost, but also the loss of critical functions during things like storms when a phone is needed,” said Craft.

Power prices for small cells

The last piece of the power challenges, said Craft, is the rising cost of energy.

“We see that the cost is going to double in the next five years and then double again in another five years,” he claimed, citing market research.

He went on to explain that when you combine this information with the prediction that in 2025, the Information and communications technology (ICT) network will use about four thousand terawatt hours, you’re looking at an energy bill of roughly three hundred billion dollars for that year to run the network.

He added that while CommScope has yet to calculate what the cost of energy might be in 2030, it has been estimated that by that date, the ICT network will use about eight thousand terawatt hours, demonstrating the dire need to cut energy costs moving forward.

The good news, Craft continued, is that by leveraging advanced tools like artificial intelligence to manage those communications systems that will require more and more electricity— like small cells — those costs can be reduced.

From CommScope’s perspective, the other pressing power challenges faced by operators as they build out their small cell networks can only be solved by “centralizing the small cell layer as much as possible.”

“This means developing a power hub cabinet that boosts power and distributes that power from a centralized location,” Craft explained. “With our PowerShift Metro solution, for instance, we want to bring AC service to a single location within a small cell network, as opposed to going to multiple small cell site locations, each with individual meters or AC connection points. And then we distribute the power with fiber to each one of those small cell locations in that communications space.”

Craft further described the need to “balance centralizing and distributing small cells.” 

“All the work that’s being done to distribute equipment out to the edge, there’s always a cost benefit for some level of centralization,” he said, adding that a centralized location for the distribution of power and connectivity for small cells, reduces cost for the number of components on each pole.

With fewer unknown variables to concern themselves with, operators have more control over how, when and where to add small cell coverage, allowing them to more swiftly respond to new market opportunities and reduce time to market.

To read more about small cells, check out What is a small cell, really?



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