The road to 5G : The inevitable growth of infrastructure cost
Network
cost could double as operators strive to meet demand for increased capacity and
deploy 5G. How can they maintain their profits?
Each generation of technology opens new opportunities for telecommunications
players. But when 4G launched in 2009, mobile operators didn’t see the great
returns they’d captured with earlier generations. Despite their investments in
4G infrastructure, revenues showed flat or tepid growth. In a few regions,
including Europe and Latin America, revenues even dropped after 4G’s
introduction.
Now 5G technology is
under testing and poised to launch in some markets later this year. Mobile
operators are preparing with a mixture of resignation and anticipation. They
know that it will open opportunities to capture value from new 5G use cases and
widespread adoption of the Internet of Things (IoT). At the same time, they are keenly aware that they’ll
have to increase their infrastructure investments in this technology.
Meanwhile, operators will still have to upgrade their 4G networks to cope with
growing demand. In an analysis of one European country, we predicted that
network-related capital expenditures would have to increase 60 percent from
2020 through 2025, roughly doubling total cost of ownership (TCO) during that
period.
This conundrum raises
important questions about investment strategy and future profits for mobile
players. In this article we will focus on the infrastructure investments
required to enable 5G.
When will operators invest in 5G infrastructure?
While many things on
the road to 5G are uncertain, it is easy to envision the emergence of new and
innovative use cases. To understand how these will change infrastructure
requirements, we grouped them into three categories: enhanced mobile broadband,
IoT, and mission-critical applications. These use cases will require network
performance to increase 10-fold over current levels across all network
parameters, as measured by latency, throughput, reliability, and scale. To get
there, mobile operators must invest in all network domains, including spectrum,
radio access network (RAN) infrastructure, transmission, and core networks.
Many elements of
current 5G technology build on 4G networks, rather than representing a complete
departure—and that means mobile operators can take an evolutionary approach to
infrastructure investment. For instance, operators could begin by upgrading the
capacity of their existing 4G macro network by refarming a portion of their 2G
and 3G spectrum, or by acquiring additional spectrum when available. This way,
they can delay investments in 5G by evolving to LTE-and LTE-Pro features, such
as 4x4 or massive MIMO (a multiple input, multiple output technology). This
evolutionary approach will be the natural path for most operators, allowing them
to minimize investments while the incremental revenue potential of 5G remains
uncertain.
When network upgrades
are no longer sufficient to support the increased traffic, operators will need
to build new macro sites or small cells. That point in time will vary by
location, but simulations show that most operators will need to embark on
significant new build-out between 2020 and 2025. That shift will be the primary
driver behind network cost increases.
How will infrastructure evolve across domains?
Although mobile
operators will take different approaches to 5G infrastructure investment, we
identified some trends for all network domains.
The race for spectrum will continue across
high and low bands
There is still low
spectrum coming to auction in low bands in many countries, but most countries
will primarily use them for increasing 4G traffic over the short
term. Mobile players are testing spectrum from 3.5 gigahertz to 80
gigahertz for 5G. Most, however, are focusing on acquiring 3.5 gigahertz bands
over the short-to-medium term, followed by 26 gigahertz and 28 gigahertz bands.
(These bands will be the first up for auction in most of the world.) The new
spectrum will give operators greater bandwidth and a consequential increase in
air capacity. Consider the European Union, which is now releasing up to 400
megahertz bandwidth on 3.5 gigahertz. Operators that do not undertake
acquisitions and continue to rely on legacy bands could soon run into capacity
issues.
Even if new spectrum is
introduced, mobile operators will need to increase their infrastructure
investment significantly to overcome certain limitations. For example,
high-frequency spectrum provides extra capacity but comes with much greater
propagation limitations. Trials of 3.5 gigahertz spectrum indicate that its
range falls to about 400 meters outdoors, compared to the much higher range
seen with current spectrum, and has lower indoor penetration. The 26 gigahertz
and higher spectrum bands will have even greater propagation limits.
As new spectrum is
introduced, mobile operators will need to improve radio interfaces and antennas
to increase efficiency of new spectrum. As handset and traffic demand
shifts out of legacy 2G and 3G, operators can increase capacity by refarming
spectrum from these bands to 4G and 5G. Announcements from operators indicate
that most European telecommunications groups are planning to shut down their 3G
networks around 2020. In the United States, operators will
decommission 2G before 3G.
Over the long term, the
new spectrum may facilitate large-scale adoption of unlicensed access. Once
that occurs, operators will face additional challenges related to controlling
spectrum access.
Operators will shift toward small-cell
solutions to satisfy urban capacity
In rural and suburban
areas, as well as along roadways, operators can handle increased traffic simply
by densifying existing networks with macro sites. In many highly populated
urban areas, by contrast, they’ll need to rely on small-cell solutions for two
reasons: a higher concentration of traffic, as measured by traffic load per
square kilometer, and the use of higher spectrum bands (greater than 3
gigahertz).
In one recent analysis
of a European city, we found that that sites with traffic density above 0.5
petabyte per square kilometer per year had a cell radius of less than 200
meters, necessitating small-cell solutions. Many other major cities or urban
neighborhoods, including Kowloon, Manhattan, and Helsinki, have similar
density, and others will be in that situation by about 2020. Many major cities
will be at 1 or 2 petabytes per square kilometer by 2025.
Fiber-only transmission will become essential
To improve
transmission, mobile operators must undertake large-scale fiberization efforts.
In addition to helping networks meet capacity and latency requirements for 5G,
fiberization is essential to support small-cell deployment in urban areas.
Core networks will converge
Core networks have been
evolving from circuit switching and packet switching toward converged structures,
such as IP multimedia subsystems (IMS). In addition to increased capacity and
functionality, core networks have benefitted from broader IT advances, such as
network functional virtualization and software defined networking. In addition
to allowing networks to provide capacity at lower unit cost, these advances
support reconfigurability and agility.
The inevitable increase in infrastructure costs
The cost and
investments related to traditional 2G, 3G, and 4G networks, unlike those for
5G, will differ over time and depend on local conditions. Operators have at
least two options. The first involves a lean-in strategy in which they
prioritize 5G investments with the hope of accelerating commercial prospects.
The second involves a more conservative approach in which they delay 5G
investments as long as possible while existing networks are upgraded.
Even if operators delay
5G investments, they will need to increase infrastructure spending to cope with
growing traffic. There is no reason to believe that the historical increase of
20 to 50 percent per year will change. However, they could fall on the higher
end of that scale, which would affect investment intensity.
In an analysis of one
European country, where all three operators followed a conservative approach to
5G investment, we predicted that total cost of ownership for RAN would increase
significantly in the period from 2020 through 2025, compared to the expected
2018 level. For instance, in a scenario that assumes 25 percent annual data
growth, TCO would rise by about 60 percent.
We grouped the
infrastructure costs for the current network footprint into four
areas: upgrades to the traditional network, the addition of new macro sites,
creation of the new 5G layer, and the addition of small cells. At present, most
expenditures go to the traditional network. However, as operators densify their
networks through additional macro sites, small cells, and the 5G layer between
2020 and 2025, these areas will represent a greater proportion of TCO.
Mobile operators will
need to develop strategies for 5G to cope with this expected growth in network
cost. Standard measures will involve cost-saving efforts, but they will also
need to explore more alternative approaches, such as network sharing (the joint
building of new 5G networks) and new revenue models.
Only nine years after
the launch of 4G, we’re getting ready for the next generation. While each
technology cycle brings greater opportunities to mobile operators, it also
requires greater infrastructure investment. To maximize their returns on 5G,
they’ll need to understand how network infrastructure and the associated cost
base will evolve over the next few years. With this knowledge, they’ll be in a
strong position to design an infrastructure investment strategy that best suits
their unique needs.
By Ferry Grijpink, Alexandre Ménard, Halldor Sigurdsson, and Nemanja Vucevic February 2018
https://www.mckinsey.com/industries/telecommunications/our-insights/the-road-to-5g-the-inevitable-growth-of-infrastructure-cost?cid=other-eml-alt-mip-mck-oth-1802&hlkid=747749a9ae104b61bedfbc1d459ae538&hctky=1627601&hdpid=33ced573-471c-4a91-859e-c60e93b75630
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