Understanding 5G by GSMA

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ANALYSIS
Understanding 5G:
Perspectives on future
technological advancements
in mobile
December 2014
© GSMA Intelligence gsmaintelligence.com • info@gsmaintelligence.com • @GSMAi

GSMA Intelligence Understanding 5G
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Contents
Executive summary............................................................................................................................. 3
Introduction.......................................................................................................................................... 4
What is 5G?........................................................................................................................................... 5
Potential 5G use cases....................................................................................................................... 8
The implications of 5G for mobile operators................................................................................11
Continuing development of mobile technologies: what 5G isn’t............................................14
Conclusions: enabling innovation through industry-wide collaboration..............................15
Appendix A: Current 5G industry activity....................................................................................18
Appendix B: LTE opportunities and challenges..........................................................................21

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Executive summary
5G offers enormous potential for both consumers and industry
As well as the prospect of being considerably faster than existing technologies, 5G holds
the promise of applications with high social and economic value, leading to a ‘hyper-
connected society’ in which mobile will play an ever more important role in people’s lives.
The GSMA will work for its members and with its partners to shape 5G
As the association representing the mobile industry, the GSMA will play a significant role
in shaping the strategic, commercial and regulatory development of the 5G ecosystem.
This will include areas such as the definition of roaming and interconnect in 5G, and the
identification and alignment of suitable spectrum bands. Once a stable definition of 5G
is reached, the GSMA will work with its members to identify and develop commercially
viable 5G applications. This paper focuses on 5G as it has developed so far, and the areas
of technological innovation needed to deliver the 5G vision.
There are currently two definitions of 5G
Discussion around 5G falls broadly into two schools of thought: a service-led view which
sees 5G as a consolidation of 2G, 3G, 4G, Wi-fi and other innovations providing far greater
coverage and always-on reliability; and a second view driven by a step change in data
speed and order of magnitude reduction in end-to-end latency. However, these definitions
are often discussed together, resulting in sometimes contradictory requirements.
Sub-1ms latency and >1 Gbps bandwidth require a true generational shift
Some of the requirements identified for 5G can be enabled by 4G or other networks. The
technical requirements that necessitate a true generational shift are sub-1ms latency and
>1 Gbps downlink speed, and only services that demand at least one of these would be
considered 5G use cases under both definitions.
Achieving sub-1ms latency is a hugely exciting challenge that will define 5G
Delivering 1ms latency over a large scale network will be challenging, and we may see this
condition relaxed. If this were to happen, some of the potential 5G services identified may
no longer be possible and the second view of 5G would become less clear. This paper
looks at some of the challenges that must be overcome to deliver 1ms latency.
At the same time 4G will continue to grow and evolve
Technologies such as NFV/SDN and HetNets are already being deployed by operators
and will continue to enable the move towards the hyper-connected society alongside
developments in 5G. Considerable potential also remains for increasing 4G adoption in
many countries, and we expect 4G network infrastructure to account for much of the $1.7
trillion the world’s mobile operators will invest between now and 2020. Operators will
continue to focus on generating a return on investment from their 4G (and 3G) networks
by developing new services and tariffing models that make most efficient use of them.

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Introduction
Objectives of this report
The purpose of this report is to take a step toward clarifying what ‘5G’ really means in the
technological sense, by: reducing 5G to its fundamental core (including acknowledging
what it is arguably not); expanding on some of the use case scenarios that 5G might
enable; and discussing conceivable implications for operators in terms of network
infrastructure and commercial opportunities. This can only be achieved by framing the
discussion around 5G in a broader context alongside existing network technologies and
those currently in development.
In summary, there are three key questions that this report will ask:
1. What is (and what isn’t) 5G?
2. What are the real 5G use cases?
3. What are the implications of 5G for mobile operators?
Notes on terminology
GSMA Intelligence’s definition of 4G includes the following network technologies: LTE,
TD-LTE, AXGP, WiMAX, LTE-A, TD-LTE-A, LTE with VoLTE and WiMAX 2.
Due to the commonality of operator definitions classifying LTE and TD-LTE as 4G
technologies, we follow this convention. This differs from the ITU’s strict definition
of transitional versus true 4G. Also, where we use the term ‘LTE’ in this document it
incorporates all LTE variants (LTE, TD-LTE, AXGP, LTE-A and TD-LTE-A). Finally, for
simplicity we do not consider WiMAX in this analysis, so where the term ‘4G’ is used it
incorporates all LTE variants but not WiMAX (a transitional 4G technology) or WiMAX 2
(a true 4G technology). Therefore for the purpose of this report the terms ‘4G’ and ‘LTE’
are interchangeable.

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What is 5G?
Evolution beyond mobile internet
From analogue through to LTE, each generation of mobile technology has been motivated
by the need to meet a requirement identified between that technology and its predecessor
(see Table 1). For example, the transition from 2G to 3G was expected to enable mobile
internet on consumer devices, but whilst it did add data connectivity, it was not until 3.5G
that a giant leap in terms of consumer experience occurred, as the combination of mobile
broadband networks and smartphones brought about a significantly enhanced mobile
internet experience which has eventually led to the app-centric interface we see today.
From email and social media through music and video streaming to controlling your home
appliances from anywhere in the world, mobile broadband has brought enormous benefits
and has fundamentally changed the lives of many people through services provided both
by operators and third party players.
Generation Primary services Key differentiator
Weakness (addressed by
subsequent generation)
1G Analogue phone calls Mobility
Poor spectral efficiency,
major security issues
2G
Digital phone calls
and messaging
Secure, mass adoption
Limited data rates – difficult
to support demand for
internet/e-mail
3G Phone calls, messaging, data Better internet experience
Real performance failed to
match hype, failure of WAP
for internet access
3.5G
Phone calls, messaging,
broadband data
Broadband internet,
applications
Tied to legacy, mobile
specific architecture
and protocols
4G
All-IP services (including
voice, messaging)
Faster broadband internet,
lower latency
?
Table 1: Evolution of technology generations in terms of services and performance
Source: GSMA Intelligence
More recently, the transition from 3.5G to 4G services has offered users access to
considerably faster data speeds and lower latency rates, and therefore the way that
people access and use the internet on mobile devices continues to change dramatically.
Across the world operators are typically reporting that 4G customers consume around
double the monthly amount of data of non-4G users, and in some cases three times as
much. An increased level of video streaming by customers on 4G networks is often cited
by operators as a major contributing factor to this.
The Internet of Things (IoT) has also been discussed as a key differentiator for 4G, but in
reality the challenge of providing low power, low frequency networks to meet the demand
for widespread M2M deployment is not specific to 4G or indeed 5G. As Table 1 suggests,
it is currently unclear what the opportunity or ‘weakness’ that 5G should address is.

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Two views of 5G exist today:
View 1 – The hyper-connected vision: In this view of 5G, mobile operators would create a
blend of pre-existing technologies covering 2G, 3G, 4G, Wi-fi and others to allow higher
coverage and availability, and higher network density in terms of cells and devices, with
the key differentiator being greater connectivity as an enabler for Machine-to-Machine
(M2M) services and the Internet of Things (IoT). This vision may include a new radio
technology to enable low power, low throughput field devices with long duty cycles of
ten years or more.
View 2 – Next-generation radio access technology: This is more of the traditional
‘generation-defining’ view, with specific targets for data rates and latency being identified,
such that new radio interfaces can be assessed against such criteria. This in turn makes
for a clear demarcation between a technology that meets the criteria for 5G, and another
which does not.
Both of these approaches are important for the progression of the industry, but they are
distinct sets of requirements associated with specific new services. However, the two
views described are regularly taken as a single set and hence requirements from both the
hyper-connected view and the next-generation radio access technology view are grouped
together. This problem is compounded when additional requirements are also included
that are broader and independent of technology generation.
5G technology requirements
As a result of this blending of requirements, many of the industry initiatives that have
progressed with work on 5G (see Appendix A) identify a set of eight requirements:
• 1-10Gbps connections to end points in the field (i.e. not theoretical maximum)
• 1 millisecond end-to-end round trip delay (latency)
• 1000x bandwidth per unit area
• 10-100x number of connected devices
• (Perception of) 99.999% availability
• (Perception of) 100% coverage
• 90% reduction in network energy usage
• Up to ten year battery life for low power, machine-type devices
Because these requirements are specified from different perspectives, they do not make
an entirely coherent list – it is difficult to conceive of a new technology that could meet
all of these conditions simultaneously.
Equally, whilst these eight requirements are often presented as a single list, no use case,
service or application has been identifed that requires all eight performance attributes
across an entire network simultaneously. Indeed some of the requirements are not
linked to use cases or services, but are instead aspirational statements of how networks
should be built, independent of service or technology – no use case needs a network
to be significantly cheaper, but every operator would like to pay less to build and run
their network. It is more likely that various combinations of a subset of the overall list of
requirements will be supported ‘when and where it matters’.

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Finally, while important in their own right, six of these requirements are not generation-
defining attributes. These are considered below:
Perceived 99.999% availability and 100% geographical coverage:
These are not use case drivers, nor technical issues, but economic and business case
decisions. 99.999% availability and 100% coverage are achievable using any existing
technology, and could be achieved by any network operator. Operators decide where to
place cells based on the cost to prepare the site to establish a cell to cover a specific area
balanced against the benefit of the cell providing coverage for a specific geographic area.
This in turn makes certain cell sites and coverage areas - such as rural areas and indoor
coverage - the subject of difficult business decisions.
Whilst a new generation of mobile network technology may shift the values that go in to
the business model that determines cell viability, achieving 100% coverage and 99.999%
availability will remain a business decision rather than a technical objective. Conversely, if
100% coverage and 99.999% availability were to be a 5G ‘qualifying criteria’, no network
would achieve 5G status until such time as 100% coverage and 99.999% availability were
achieved.
Connection density (1000x bandwidth per unit area, 10-100x number of connections):
These essentially amount to ‘cumulative’ requirements i.e. requirements to be met by
networks that include 5G as an incremental technology, but also require continued support
of pre-existing generations of network technology. The support of 10-100 times the number
of connections is dependent upon a range of technologies working together, including
2G, 3G, 4G, Wi-fi, Bluetooth and other complementary technologies. The addition of 5G
on top of this ecosystem should not be seen as an end solution, but just one additional
piece of a wider evolution to enable connectivity of machines. The Internet of Things (IoT)
has already begun to gain significant momentum, independent of the arrival of 5G.
Similarly, the requirement for 1,000 times bandwidth per unit area is not dependent upon
5G, but is the cumulative effect of more devices connecting with higher bandwidths for
longer durations. Whilst a 5G network may well add a new impetus to progression in
this area, the rollout of LTE is already having a transformational effect on the amount of
bandwidth being consumed within any specific area, and this will increase over the period
until the advent of 5G. The expansion of Wi-fi and integration of Wi-fi networks with
cellular will also be key in supporting greater data density rates.
Meeting both of these requirements will have significant implications for OPEX on backhaul
and power, since each cell or hotspot must be powered and all of the additional traffic
being generated must be backhauled.
Reduction in network energy usage and improving battery life:
The reduction of power consumption by networks and devices is fundamentally important
to the economic and ecological sustainability of the industry. A general industry principle
for minimising power usage in network and terminal equipment should pervade all
generations of technology, and is recognised as an ecological goal as well as having a

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significant positive impact on the OPEX associated with running a network. At present it
is not clear how a new generation of technology with higher bandwidths being deployed
as an overlay (rather than a replacement) on top of all pre-existing network equipment
could result in a net reduction in power consumption.
Some use cases for M2M require the connected device in the field to lie dormant for
extended periods of time. It is important that innovation in how these devices are
powered and the leanness of the signaling they use when becoming active and connected
is pursued. However, this requirement is juxtaposed with 5G headline requirements on
data rate – what is required for mass sensor networks is very occasional connectivity with
minimal throughput and signaling load. Work to develop such technology predates the
current 5G requirements and is already being pursued in Standards bodies.
These six requirements should be and are being pursued by the industry today using a
range of techniques (some of which are covered later in the paper) but these amount
to evolutions of existing network technology and topology or opportunities enabled
by changing hardware characteristics and capabilities. These will in turn open business
opportunities for operators and third parties. However, none of these business opportunities
exist today – they are constrained by limitations greatly governed by economics, and
much of these six requirements are motivated by improving the economic viability of
those opportunities, rather than filling technological gaps that explicitly prohibit these
opportunities, regardless of the amount they might cost to enable.
Thus in the strictest terms of measurable network deliverables which could enable
revolutionary new use case scenarios, the potential attributes that would be unique to 5G
are limited to sub-1ms latency and >1 Gbps downlink speed.
Potential 5G use cases
Imagining the mobile services of the next decade
As with each preceding generation, the rate of adoption of 5G and the ability of operators
to monetise it will be a direct function of the new and unique use cases it unlocks. Thus
the key questions around 5G for operators are essentially:
a. What could users do on a network which meets the 5G requirements listed above
that is not currently possible on an already existing network?
b. How could these potential services be profitable?
Figure 1 illustrates the latency and bandwidth/data rate requirements of the various use
cases which have been discussed in the context of 5G to date. These potential 5G use
cases and their associated network requirements are described below.

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Delay
1ms
10ms Disaster
alert
Automotive
ecall
Monitoring
sensor networks
Personal
cloud
Wireless cloud
based office
Video
streaming
First responder
connectivity
Bi-directional
remote controlling
Real time
gaming
Autonomous
driving
Augmented
Reality
Virtual
Reality
Tactile
internet
Multi-person
video call
Device
remote
controlling
100ms
1,000ms
<1 Mbps 1 Mbps 10 Mbps 100 Mbps >1 Gbps
Fixed Nomadic On the go
Services that could be
enabled by 5G
Services that can be delivered
by legacy networks
Bandwidth
throughput
M2M connectivity
Figure 1: Bandwidth and latency requirements of potential 5G use cases
Virtual Reality/Augmented Reality/Immersive or Tactile Internet
These technologies have a number of potential use cases in both entertainment (e.g.
gaming) and also more practical scenarios such as manufacturing or medicine, and could
extend to many wearable technologies. For example, an operation could be performed by
a robot that is remotely controlled by a surgeon on the other side of the world. This type
of application would require both high bandwidth and low latency beyond the capabilities
of LTE, and therefore has the potential to be a key business model for 5G networks.
However, it should be pointed out that VR/AR systems are very much in their infancy and
their development will be largely dependent on advances in a host of other technologies
such as motion sensors and heads up display (HUD). It remains to be seen whether these
applications could become profitable businesses for operators in the future.
Autonomous driving/Connected cars
Enabling vehicles to communicate with the outside world could result in considerably
more efficient and safer use of existing road infrastructure. If all of the vehicles on a
road were connected to a network incorporating a traffic management system, they
could potentially travel at much higher speeds and within greater proximity of each other
without risk of accident - with fully-autonomous cars further reducing the potential for
human error.

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While such systems would not require high bandwidth, providing data with a command-
response time close to zero would be crucial for their safe operation, and thus such
applications clearly require the 1 millisecond delay time provided in the 5G specification.
In addition a fully ‘driverless’ car would need to be driverless in all geographies, and hence
would require full road network coverage with 100% reliability to be a viable proposition.
Wireless cloud-based office/Multi-person videoconferencing
High bandwidth data networks have the potential to make the concept of a wireless
cloud office a reality, with vast amounts of data storage capacity sufficient to make
such systems ubiquitous. However, these applications are already in existence and their
requirements are being met by existing 4G networks. While demand for cloud services
will only increase, as now they will not require particularly low latencies and therefore can
continue to be provided by current technologies or those already in development. While
multi-person video calling - another potential business application - has a requirement for
lower latency, this can likely be met by existing 4G technology.
Machine-to-machine connectivity (M2M)
M2M is already used in a vast range of applications but the possibilities for its usage are
almost endless, and our forecasts predict that the number of cellular M2M connections
worldwide will grow from 250 million this year to between 1 billion and 2 billion by 2020,
dependent on the extent to which the industry and its regulators are able to establish the
necessary frameworks to fully take advantage of the cellular M2M opportunity.
Typical M2M applications can be found in ‘connected home’ systems (e.g. smart meters,
smart thermostats, smoke detectors), vehicle telemetric systems (a field which overlaps
with Connected cars above), consumer electronics and healthcare monitoring. Yet the
vast majority of M2M systems transmit very low levels of data and the data transmitted
is seldom time-critical. Many currently operate on 2G networks or can be integrated with
the IP Multimedia Subsystem (IMS) – so at present the business case for M2M that can be
attached to 5G is not immediately obvious.
A true requirement for a generational shift?
Thus many of the services that have been put forward as potential ‘killer apps’ for 5G
do not require a generational shift in technology, and could be provided via existing
network technologies. Only applications that require at least one of the key 5G technical
requirements – sub-1ms latency and >1 Gbps downlink speed – can be considered true
next generational business cases.
Of these two requirements, reducing latency to sub-1ms levels may provide the greatest
technical challenge (see page 12). Meanwhile, as discussed in more detail in Appendix B,
operators are already making a considerable amount of progress in increasing the data
speeds of their existing networks by adopting LTE-A technologies (see Figure 2). While
it is important to note that although many of the use cases and services discussed in this
section do not strictly require 5G, they could offer an enhanced user experience on a 5G
network. However this amounts to an incremental benefit that is more difficult to market
than a genuine new service, and not a core component of any 5G business case.

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3.5G/DC-HSPA+
4G/LTE
4G/LTE Cat. 4
4G/LTE Advanced
5G*
1,000 Mbps
10,000 Mbps
150 Mbps
100 Mbps
42.2 Mbps
Figure 2: Maximum theoretical downlink speed by technology generation, Mbps
(*10 Gbps is the minimum theoretical upper limit speed specified for 5G)
The implications of 5G for mobile operators
The progress from initial 3G networks to mobile broadband technology has transformed
industry and society by enabling an unprecedented level of innovation. If 5G becomes
a true generational shift in network technology, we can expect an even greater level
of transformation. There are varying implications of providing an increased level of
connectivity or developing a new radio access network (RAN) to deliver a step change in
per connection performance, or a combination of the two. This means that the final design
of a 5G network could be any one of a range of options with differing radio interfaces,
network topologies and business capabilities.
While a shift to 5G would be hugely impactful, the industry will need to overcome a series
of challenges if these benefits are to be realised, particularly in terms of spectrum and
network topology.
5G spectrum and coverage implications
While there are a number of spectrum bands which could potentially be used in meeting
some of the 5G requirements identified to date, there is currently a substantial focus
on higher frequency radio spectrum. As discussed in Appendix A, operators, vendors
and academia are combining efforts to explore technical solutions for 5G that could use
frequencies above 6GHz and reportedly as high as 300 GHz. However, higher frequency
bands offer smaller cell radiuses and so achieving widespread coverage using a traditional
network topology model would be challenging.
It is widely accepted that ‘beam-forming’ - the focussing of the radio interface into a
beam which will be usable over greater distances – is an important part of any radio
interface definition that would use 6GHz or higher spectrum bands. This however means
that the beam must be directed at the end user device that is being connected. Since
the service being offered is still differentiated from fixed line connections on the basis

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of ‘mobility’, the beam itself will have to track the device. This is innovation that could
make 5G an expensive technology to deploy on large scale, since each cell may have to
support several hundred individual beams at any one time and track the end users that
are connected via these beams in three dimensional space.
High-order MIMO (Multi-Input, Multi-Output) is another method for increasing bandwidth
that is often discussed. This is where an array of antennae is installed in a device and
multiple radio connections are established between a device and a cell. However, high-
order MIMO can have issues with radio interference, so technology is required to help
mitigate this problem. This tends to focus on a need for the radio network to adjust its
beam to take into account the specific orientation of the antenna at any given time.
All of this is incremental research and development over and above that currently being
conducted for 4G. The use of bands higher than 6GHz will likely require operators to invest
in an entirely new RAN since it will have fundamentally different masthead requirements.
Given the level of infrastructure required to achieve the desired network topology, operators
may be forced to rethink their existing business models. New technology is rarely a cheap
option, and the nature of the new technology that is required in the radio network makes
it very power-intensive, hence counter to the stated requirement for significant reduction
in overall network power consumption.
That said, vendors are researching ways to include beam forming and MIMO technology
in mobile devices. As a result, the process of identifying and aligning internationally
around common bands for 5G will have a clear dependency on the technology that can
be identified to overcome band usage in high frequencies for wide area coverage.
Can 1 millisecond latency be achieved?
Achieving the sub-1ms latency rate identified as a technical requirement for 5G necessitates
a new way of thinking about how networks are structured, and will likely prove to be
a significant undertaking in terms of technological development and investment in
infrastructure.
Despite the inevitable advances in processor speeds and network latency between now
and 2020, the speeds at which signals can travel through the air and light can travel along
a fibre are governed by fundamental laws of physics. Subsequently services requiring a
delay time of less than 1 millisecond must have all of their content served from a physical
position very close to the user’s device. Industry estimates suggest that this distance
may be less than 1 kilometre, which means that any service requiring such a low latency
will have to be served using content located very close to the customer, possibly at the
base of every cell, including the many small cells that are predicted to be fundamental to
meeting densification requirements. This will likely require a substantial uplift in CAPEX
spent on infrastructure for content distribution and servers.
If any service requiring 1 millisecond delay also has a need for interconnection between
one operator and another, this interconnectivity must also occur within 1 kilometre of
the customers. This could well be the case in a service such as social networking content
pushed into augmented reality. Today, inter-operator interconnect points are relatively
sparse, but to support a 5G service with 1 millisecond delay, there would likely need to be

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interconnection at every base station, thus impacting the topological structure of the core
network. Roaming customers would need to have visited network contextual roaming
capabilities, and have content relevant to their applications available directly from the
visited network, posing challenges for the existing roaming model.
In the most extreme case, it would make sense for a single network infrastructure to be
implemented, which would be utilised by all operators. This would mean all customers
could be served by a single content source, with all interaction and interconnect with
localised context also being served from that point at the base station. This would also
imply that only one radio network would be built, and then shared by all operators.
Figure 3: Latency performance for LTE compared to latency requirement for 5G
Source: GSMA
Such a model would considerably reduce CAPEX in the network build (since rather than
say four operators building four parallel networks, only a single network would be built)
but would require unprecedented levels of co-operation between operators. It would also
impact the nature of inter-operator competition, shifting focus to services rather than
data rate and coverage differentiation. It would also make spectrum auctions somewhat
irrelevant, since only one radio network being built would mean there would only be one
bidder and one license per market.
Once this is all realised, it is likely that requirements for sub-1ms delay will be relaxed
or possibly removed entirely from 5G, rather than industry committing to the massive
upheaval and resource acquisition that would be implied. If this were to happen, it may
draw into question the viability of coupling services such as augmented and virtual reality,
immersive internet and autonomous driving with mobility. However, if those services were
removed from the expected service set, the justification for the technological view of 5G
would also become questionable.
LTE – min 10ms
4ms 4ms 1-2ms 5-10ms
if in the same country
as the customer
Core
Network
Internet
5G service sub-1ms
<0.5ms <0.5ms
Content

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Continuing development of network technologies: what 5G isn’t
To further enhance the mobile broadband experience for customers, operators are
continuing to develop their 4G networks through the deployment of LTE-Advanced
technologies. Many are also deploying technologies such as network function virtualisation
(NFV), software defined networks (SDN), heterogeneous networks (HetNets) and low
power, low throughput (LPLT) networks. These allow different network upgrade paths
and expansion of coverage through integration of broader wireless technologies, as well
as potentially having a positive effect in the total cost of ownership of the network.
The term 5G is sometimes used to encapsulate these technologies. However, it is important
to clarify that these technological advancements are continuing independently of 5G.
While these are areas that will have significant impact on the mobile industry over the
coming years, explicitly including them under the term 5G has the potential to adversely
affect progress in the industry between now and the realisation of 5G as a commercial
service.
A summary of these technologies follows:
Network Function Virtualisation (NFV) and Software Defined Networks (SDN)
NFV is a network architecture concept that enables the separation of hardware from
software or ‘function’, and has become a reality for the mobile industry due to the increased
performance of ‘common, off-the-shelf’ (COTS) IT platforms. SDN is an extension of NFV
wherein software can perform dynamic reconfiguration of an operator’s network topology
to adjust to load and demand, e.g. by directing additional network capacity to where it is
needed to maintain the quality of customer experience at peak data consumption times.
A number of operators have built or are building part or all of their LTE networks using
NFV and SDN as the basis.
These technologies in combination can potentially reduce operator CAPEX as they offer
a cheaper and simpler network architecture that is easier to upgrade, while OPEX is also
reduced through power savings as network capacity is only provided when and where it
is needed. However, shifting from existing structures to IT-based soft functions will bring
new complexities for operators in terms of network provisioning and management, as
well as requiring a new skill set within operator staff.
Heterogeneous Networks (HetNets)
HetNet refers to the provision of a cellular network through a combination of different cell
types (e.g. macro, pico or femto cells) and different access technologies (i.e. 2G, 3G, 4G,
Wi-fi). By integrating a number of diverse technologies depending on the topology of the
coverage area, operators can potentially provide a more consistent customer experience
compared to what could be achieved with a homogenous network.
Small cell deployments are a key feature of the HetNet approach as they allow considerable
flexibility as to where they are positioned, however, the use of more cells brings implications
in terms of power supply and backhaul, especially when they are located in remote areas.
Wi-fi can also play a significant role in HetNets, both in terms of data offload and roaming.

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HetNet technology has typically been developed in relation to data networking, but
recently voice has been brought under the scope as well, not least because of support for
Wi-fi calling being available in Apple’s iPhone 6 which was released in September 2014.
Conclusions: enabling innovation through industry-wide collaboration
The many initiatives and discussions on 5G going on around the world by governments,
vendors, operators and academia demonstrate the continuing ethos of collaboration and
innovation across the industry. In these debates we must ensure that we continue to co-
ordinate with aligned goals to maintain momentum in completing the definition of 5G.
The key 5G considerations at this stage are:
When 5G arrives will be determined by what 5G turns out to be
As discussed earlier, there are currently two differing views of what 5G is. The first view
makes its implementation somewhat intangible – 5G will become a commercial reality
when sufficient industry voices say so, but this will be something that is difficult to
measure by any recognisable metric. The second approach is more concrete in that it has
a distinct set of technical objectives, meaning that when a service is launched that meets
those objectives it will count as the advent of 5G.
As the requirements identified for 5G are a combination of both visions, in some cases
the requirement set is self-contradictory – for example, it would not be possible to have a
new RAN with beam forming and meet a requirement for power reduction, because beam
forming uses a lot more power than today’s RAN. As a result, there must be an established
answer to the question of what 5G is before there can be an answer to the question of
when it will arrive.
The case for a new RAN should be based on its potential to improve mobile networks
The principal challenge in the 5G specification is the sub-1ms latency requirement, which
is governed by fundamental laws of physics. If, as discussed above, this challenge proves
too much and the requirements for sub-1ms delay are removed from 5G, the need for
a new RAN would be questioned. Whether a new air interface is necessary is arguably
more of a question of whether one can be invented that significantly improves mobile
networks, rather than on a race to the arbitrary deadline of 2020.
This raises the question of where the industry should go next. Without a new air interface,
the ‘5G’ label makes less sense, as the industry would need to shift to the evolutionary view
of 5G - with the new networks building on LTE and Wi-fi by adding new functionalities
and architecture.
5G should not distract from more immediate technological developments
Technologies such as multiple-carrier LTE-A, NFV/SDN, HetNets and LPLT networks will
form an important part of the evolution of mobile networks. Each has the potential to
offer tangible benefits to operators within the next few years, and so the industry should
not risk losing focus on the potential benefits of these technologies in the short and

16
medium term. Also, the term ‘5G’ should always be associated with the definition of new
radio technology. Everything else is the net result of other forms of innovation.
LTE remains very important and will continue to evolve
There remains considerable potential for future LTE growth, which still only accounts for
5% of the world’s mobile connections. LTE penetration as a percentage of connections
is already as high as 69% in South Korea, 46% in Japan and 40% in the US, but LTE
penetration in the developing world stands at just 2%. Hence there is still a substantial
opportunity for operators to generate returns on their investment in LTE networks.
LTE technology will also continue to develop, with operators already making a considerable
amount of progress in increasing the data speeds of their existing networks by adopting
multiple-carrier LTE-A technologies. Therefore, while there remain monetisation and
interconnect issues around LTE, these advancements will enable operators to offer many
of the services that have been put forward in the context of 5G long before 5G becomes
a commercial reality.
The industry should make full use of governmental interest and resources
As detailed in Appendix A, there is a considerable level of governmental interest worldwide
in the subject of 5G, not to mention a substantial amount of funding available for research
and development in the field. It is important that the industry leverages this and effectively
channels the focus and resource into something meaningful for both operators and their
customers. This should be implemented in a coordinated framework to avoid a fragmented
vision of 5G for different parts of the world.
5G is an opportunity to develop a more sustainable operator investment model
If previous generations of mobile technology have taught us anything, it is it that, as with
each preceding generation, 5G will unlock value in ways we cannot and will not anticipate.
Services that were initially expected to have a negligible impact became hugely popular
(e.g. SMS), while those expected to be the ‘next big thing’ have been slow to gain traction
(e.g. video calling). Through the development of 5G, we as an industry can expect a
paradigm shift in the way that all of the stakeholders in the mobile ecosystem play their
role. Regulators especially can use this as an opportunity to create healthier environments
that stimulate continuing investment in next generation technology.
Some of the business cases that have worked well for 3G and 4G technologies may not be
the right ones for 5G. By actively conceiving and exploring 5G business cases at an earlier
stage, operators will have greater potential to shape the new paradigm.
The GSMA will continue to work with its members to shape the future of 5G
Whichever form 5G eventually takes, the GSMA, as the association representing the mobile
industry, looks forward to contributing to the development of a 5G ecosystem through
collaboration and thought leadership. The GSMA’s focus is on:

17
• working with its operator members to identify and develop commercially viable 5G
applications
• collaborating in the work being undertaken in terms of research, development and
definition of 5G technologies by industry groups such as 3GPP, NGMN and ITU-R, and
contributing to the various working groups in these areas
• identifying requirements around roaming and interconnect
• driving the development of the regulatory framework for 5G by identifying suitable
spectrum bands for its operation, and working with governments around the world to
ensure international alignment within those bands
• creating a forum for relevant parties to discuss 5G through e.g. GSMA boards and
committees, industry workshops, Mobile World Congress etc.
The successful shift to next generation networks can only be achieved through strong
industry-wide collaboration. The GSMA will continue communicating through subsequent
papers to influence the strategic direction of 5G development, as the business case
and technical requirements for 5G become clearer. In order to realise the immense
opportunity that 5G represents for the industry, the GSMA will do all it can to ensure that
the next generation of telecommunications deliver innovation and consumer benefits in
an economically viable way.

18
Appendix A: Current 5G industry activity
Since 2012, a number of initiatives have been established to define and develop 5G and
there have also been a considerable number of statements from interested parties such
as governments and infrastructure vendors. Having fallen behind Eastern Asia and North
America in terms of mobile technological advancement due to a relatively slow rollout
and adoption of 4G networks, European governments are particularly keen to get ahead
of the curve in the 5G space and there have been a number of announcements from Neelie
Kroes, European Commission (EC) Vice President for Digital Agenda, on the subject going
back to Mobile World Congress 2013. The governments of Japan, South Korea and China
have also been particularly active in driving the 5G agenda.
Meanwhile, vendors such as Ericsson, Huawei, NSN and Samsung all began research and
development towards 5G in 2013, and this year mobile operators have also begun making
announcements regarding their own 5G laboratory trials. A summary of the key parties,
milestones and targets is below.
ITU-R launched “IMT for
2020 and beyond”
setting the stage for “5G”
Japan, Korea and China
working on 5G
requirements
Neely Kroes press
conference in Barcelona
launched 5G PPP (5G public
private partnership)
EU project METIS starts
work on defining 5G
•
•
•
•
•
•Samsung, NSN,
Huawei, Ericsson have
all started developments
toward 5G
NTT Docomo announced
“experimental trials” for 5G
using higher frquency bands
2012 2013 2014 2020
Figure 4: Timeline of key events in 5G developments
ITU Radiocommunication Sector (ITU-R)
The ITU-R plays a key role in in the global management of the radio-frequency spectrum
and satellite orbits as well as being the body that defined the criteria for previous
generations of technology – the IMT-2000 family of technologies correlates directly to
3G, whilst the intent was that IMT-Advanced technologies would be 4G. However, for 4G
the relationship between ITU-R IMT definitions and specific ‘G’s became broken. IMT-
Advanced only identifies two technologies as meeting the criteria laid out by ITU-R for
4G – LTE-A and WiMAX2. Operators and equipment vendors blurred this definition by
marketing LTE, WiMAX and even HSPA+ as ‘4G’. LTE and WiMAX are in fact included in
the IMT-2000 technology group, and so, if the association between ITU-R IMT groups and
‘generations’ were to be maintained, LTE and WiMAX would be 3rd Generation, rather
than 4th.
In early 2012, ITU-R began a programme to develop “IMT-2020” (International Mobile
Telecommunications 2020), setting the stage for the 5G research activities that have
since emerged across the world. In 2015, the organisation plans to finalise its “Vision” of

19
the 5G mobile broadband connected society. This view of the horizon for the future of
mobile technology will be key in setting the agenda for the World Radiocommunication
Conference (WRC) 2015, where discussions regarding additional spectrum will take place
in support of the future growth of the industry.
NGMN Alliance
The NGMN (Next Generation Mobile Networks) Alliance is a forum made up of 24 mobile
operators and various other mobile industry ecosystem companies including network
and handset vendors, and research institutes. NGMN began working on identifying
requirements for 5G standards in Q4 2013 and plans to present a white paper detailing
end-to-end requirements for 5G at its industry conference in March 2015. The paper is
intended to support the standardisation and subsequent availability of 5G from 2020.
The NGMN Alliance has positioned itself as the lead organisation driving the 5G agenda,
although is yet to make any public statement on what the requirements it defines might
be.
European Commission
The EC’s 5G research activities began in November 2012 with the co-funding of METIS
(Mobile and wireless communications Enablers for the Twenty-twenty (2020) Information
Society), a consortium of 29 partners spanning vendors, operators, the automotive industry
and academia focused on the next generation of mobile and wireless communications
systems for year 2020. A year later METIS published its five key 5G scenarios, 12 test cases
and seven Key Performance Indicators for 5G, associated with technical requirements.
The project is due to release its final report in April 2015.
In December 2013, the EC went further and announced a joint 5G research and innovation
project with the private sector - The 5G Infrastructure Public Private Partnership (5G
PPP) - with collective funding of ¤4.2 billion, of which ¤700 million will come from the
commission itself, reflecting its desire to seize the initiative in 5G development. 5G PPP
will facilitate research into solutions, architectures, technologies and standards for 5G
infrastructure, and aims to ensure that at least 20% of 5G standards essential patents
(SEP) are developed and owned by European organisations, while ensuring that European
vendors retain at least 35% of global market share in the supply of future network
infrastructure.
National governments
Outside of Europe, the majority of 5G research appears to be confined to Eastern Asia,
with China, Japan and South Korea all working independently on defining 5G requirements.
China’s 5G initiative, named ‘IMT-2020’, is a combination of three government agencies
and has established eight working groups with the aim of promoting the development of
5G technologies in the country.
Meanwhile, Japan’s ‘2020 and Beyond Ad Hoc’ (20B AH) group was established by the
Association of Radio Industries and Businesses (ARIB) in September 2013 to study the
concept, function and architecture of mobile communications systems going into the next

20
decade, as well as the services and applications those systems could offer. The country
has set an ambitious target of having commercial 5G services available in time for the
2020 Olympic Games in Tokyo.
Equally ambitious 5G targets have been set in South Korea. The country’s ‘5G Forum’
group’s website states that “The 5G technology is expected to be commercialised by 2020
with 1,000-time speed of current LTE data transfer.” The Korean Ministry of Education,
Science and Technology has allocated $1.6 billion of funding to the project.
Individual operators and vendors
More ambitious yet is South Korean market leader, SK Telecom, who announced last
July that it had signed an agreement with Ericsson to develop 5G technology in time to
demonstrate a network at the 2018 Winter Olympics in Pyeongchang. Earlier that month,
the vendor had already demonstrated a 5Gbps data throughput speed in laboratory trials,
in the 15 GHz frequency band.
Again the majority of research and innovation at the operator and vendor level is taking
place in Eastern Asia, with both Huawei and Samsung having reportedly achieved latencies
of less than 5 milliseconds in laboratory trials. Japan’s NTT DoCoMo has also begun
conducting extensive “experimental trials” of potential 5G technologies across multiple
frequency bands. The operator has partnered with various vendors to test technologies in
a number of spectrum bands, including Alcatel-Lucent (3-6 GHz), Fujitsu (3-6 GHz), NEC
(5 GHz), Ericsson (15 GHz), Samsung (28 GHz) and Nokia (70 GHz).

21
Appendix B: 4G opportunities and challenges
LTE is still in the early stages of its lifecycle
Historically, cellular technologies have adhered to an approximate 20-year cycle from
launch to peak penetration, with around ten years between the launch of each new
technology (see Figure 5). The first commercial LTE networks went live in 2009 and
based on historical precedent we would not expect the technology to reach a peak level
of connections until around 2030.
1980 1990
1G – AMPS (19 years)
9 years
2G – GSM (18 years)
3G – WCDMA (19 years)
4G – LTE (18 years)
2000 2010 2020 2030
Launch
Peak
10 years
9 years
Today
Figure 5: Evolution of mobile technology by generation, 1980 onwards
In reality, the adoption of LTE is proceeding at a faster rate than its predecessor
technologies (see Figure 6), yet we still do not expect LTE connections to peak until
well into the next decade. The technology is still at an early stage in its lifecycle, with
networks currently confined to just 110 of the world’s 237 mobile markets. Hence LTE still
represents a considerable growth opportunity for the industry – at present, only around
a third of the world’s mobile operators (293) have live LTE networks. Assuming all known
future network launches go ahead as planned, 158 countries will soon have at least one
LTE operator – yet this still leaves one third of the world’s mobile markets as untapped
territory for LTE services.
0
3,500
3,000
2,500
2,000
1,500
1,000
500
5,000
4,000
4,500
2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020
2G
3G
4G LTE
Mobileconnections(inmillions)
Figure 6: Total cellular connections, global, by technology generation

22
In terms of coverage, we expect LTE networks to reach 26% of the world’s population by
the end of 2014 (see Figure 7), although the technology will account for only 6% of global
connections at that time, illustrating the considerable growth potential for LTE even in
regions with widespread networks such as the Americas, Europe and Oceania, where we
expect coverage to increase from around three in five people on average in 2014 to more
than four in five by 2020.
An expected proliferation of launches will also bring coverage to more than two thirds of
the population of Asia by that time, while almost one in five Africans will also be covered
by LTE networks, more than double the current proportion. Thus globally we expect that
LTE coverage will rise from a quarter now to more than 60% of the world’s population by
2020 – meaning that 4.9 billion people will potentially have access to the technology.
20%10% 30% 40% 60% 70% 80% 90% 100%
World
Africa
Americas
Asia
Europe
Oceania
0%
2014
2020
Figure 7: LTE network coverage forecasts, as a % of population by region
Opportunities for further evolution of LTE
As a technology, LTE continues to develop. Operators are already making a considerable
amount of progress in increasing the data speeds of their existing networks by adopting
dual-carrier LTE-A technologies, which can achieve theoretical downlink speeds of up to
300 Mbps. As of October 2014, some 22 operators had already launched LTE-A, and we
are aware of firm commitments by a further 47 to implement the technology. All in all 15
countries across the world now have live LTE-A networks, and this figure will increase to
35 assuming that all currently planned networks successfully make it to the commercial
launch stage.
LTE-A should be able to meet mobile broadband demand (in terms of speed) for several
years to come and will provide operators with increasing opportunities to develop
attractive and profitable 4G services. In addition, 3GPP is also working on optimising
congestion control for more efficient use of M2M on LTE networks.

23
LTE is driving increasing CAPEX levels
Given the potential that remains for increasing 4G adoption in many countries, we expect
to see considerable further investment in the technology. We forecast that the world’s
mobile operators will invest $1.7 trillion in network infrastructure over the period 2014-
2020 (see Figure 8), much of which will be in 4G networks. This outlay is a considerable
uplift on the estimated $878 billion invested over the period 2009-2013 and underlines
the industry’s commitment to meeting the exponentially increasing demand for mobile
broadband services as well as connecting ‘the next billion people’ to the internet.
$150,000
$100,000
$50,000
$300,000
$200,000
$250,000
$0
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
(inmillions)
Figure 8: Total mobile operator CAPEX forecast, annual, in million US$
The monetisation challenge that remains for LTE
The rapid migration towards LTE in the world’s most advanced mobile markets has driven
a surge in data usage, with 4G users typically consuming twice as much data per month
as other users. However, while the introduction of LTE has led to an uplift in ARPU in some
instances, the impact on revenue varies widely depending on the market. For example, in
South Korea KT reported an LTE ARPU of KRW 44,300 ($41.91) in Q2 2014, 31.8% greater
than their blended ARPU for the same period. Operators in the US are seeing similar trends
with Verizon Wireless – the largest LTE operator globally with 53.7 million 4G connections
in Q2 2014 – announcing that its Q2 2014 ARPA (average revenue per account) was up
4.7% on a year earlier to $159.73 (based on an average of 2.8 connections per account).
However, in regions such as Europe, the migration towards LTE is at a significantly earlier
stage and while they have reported similar trends in terms of data consumption, mobile
operators in these regions are not yet seeing the same positive impact on revenue from
LTE as witnessed in ‘digital pioneer’ markets such as South Korea, the US and Japan.
In many cases, European operators are pricing 4G at the same price as 3G from the
outset, while those that initially charged a premium for 4G are having to re-evaluate in
the face of strong competition. Hence, the most significant challenge around LTE for
many operators remains the monetisation of the networks that they have invested heavily

24
in. While operators are transitioning their tariff structures to become increasingly data-
centric, the continued decline in voice and SMS revenues is in many cases yet to be offset
by corresponding increases in data revenues.
Thus, operators must seek to manage the change in usage patterns and pricing to minimise
any cannibalisation of voice and SMS revenues and to ensure that margins are protected
and future investment in LTE and other network technologies remains viable.
LTE interconnect and roaming issues
Interconnect is another area where LTE still has significant challenges to overcome.
The GSMA has made progress in this area through the definition of IP eXchange (IPX),
a technology with an all-IP core that can provide an improved interconnection which
enhances the richness and quality of LTE data roaming. IPX allows the data roaming
experience to be managed from end-to-end and manipulated in real time, which is useful
for providing services requiring particular attributes e.g. high bandwidth, low latency.
However, the wider adoption of voice over LTE (VoLTE) has been constrained by the
absence of a standard IP-based interconnect technology for voice, largely due to operator
concerns about being unable to effectively manage and bill VoLTE traffic in the same way
as traditional voice calls. Reaching an agreed technical standard for VoLTE interconnect
is crucial, as voice services must provide a consistent experience for customers over any
network, anywhere in the world. Hence the GSMA will continue to work towards the goal
of delivering a seamless VoLTE interconnect and roaming service for consumers while
protecting the commercial interests of operators.

25
Authors
Dan Warren Senior Director, GSMA Technology
Calum Dewar Lead Analyst, GSMA Intelligence
Other GSMA contributors to this report:
Hyunmi Yang Chief Strategy Officer
Javier Albares Head of Corporate Strategy
Elisa Balestra Corporate Strategy Manager
Scott Burcher Senior Analyst, GSMA Intelligence
Matthew Bloxham Senior Director - Head of Policy Research, Government & Regulatory Affairs
Wladimir Bocquet Senior Director - Spectrum Policy, Government & Regulatory Affairs

26
About GSMA Intelligence
GSMA Intelligence is the definitive source of global mobile operator data, analysis and
forecasts; and a publisher of authoritative industry reports and research.
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— from Afghanistan to Zimbabwe. It is the most accurate and complete set of industry
metrics available, comprising tens of millions of individual data points, updated daily.
GSMA Intelligence is relied on by leading operators, vendors, regulators, financial institutions
and third-party industry players, to support strategic decision-making and long-term
investment planning. The data is used as an industry reference point and is frequently cited
by the media and by the industry itself.
For more information, visit gsmaintelligence.com/about/
Whilst every care is taken to ensure the accuracy of the information contained in this material, the facts, estimates and opinions stated are
based on information and sources which, while we believe them to be reliable, are not guaranteed. In particular, it should not be relied upon
as the sole source of reference in relation to the subject matter. No liability can be accepted by GSMA Intelligence, its directors or employees
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material, or our conclusions as stated. The findings are GSMA Intelligence’s current opinions; they are subject to change without notice. The
views expressed may not be the same as those of the GSM Association. GSMA Intelligence has no obligation to update or amend the research
or to let anyone know if our opinions change materially.
© GSMA Intelligence 2014. Unauthorised reproduction prohibited.
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gsmaintelligence.com • info@gsmaintelligence.com • @GSMAi

Understanding 5G by GSMA

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