LTE Voice Summit, October, 2014

1. LTE Voice Summit
The Impact of VoLTE on BSS
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Dr. Bart Lehane
Openet

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Overview
Why? When? How?

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Overview
Why? When? How?

4. Do we need VoLTE? Is there a Demand?
• Voice is still growing
• ~10% increase over the
past four years
• Source: Commission for
Communications Regulation
– Irish Communications
Market Quarterly Key Data
Report, 11 Sept 2014
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5. VoLTE Subscriber Impacts
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Better Call Quality Rapid Call Setup
Time
Lower power
consumption
Interactive Services VoLTE ≠ HD Voice
LTE networks support
QoS scheduling that
ensures that voice
packets are being
transmitted with
tightly controlled
latency and jitter
Calls can be setup in
a fraction of the time
using VoLTE, again
improving the overall
voice calling
experience.
LTE technology
enables the phone to
dramatically reduce
power consumption
during inactive
periods reducing
power consumption
40% vs. 3G
Messaging, video
and interactive
services can all be
used at the same
time. For operators,
these services are
built on the same
VoLTE infrastructure
VoLTE will not form
part of customer
messaging.
Operators are using
HD & Clear Voice
branding to message
this to their
subscribers

6. VoLTE Launch Material
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7. VoLTE Operator Benefits & Context
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Innovative
Network Image
CS voice calls
spectrally
inefficient
Single Packet
Switched Network
Network
Modification e.g.
Replacing 1stGen
PCRF for VoLTE
Catalyst for Change
in Charging
Systems
HD Voice is
increasingly used to
differentiate voice
providers and
demonstrate quality
of a network
Providing data
services on one
network and voice
services on older
circuit switched
networks, may not
make best use of
scarce resources
A single network that
can deliver all
services was one of
the key requirements
when 3GPP were
defining LTE and
remains a
requirement today
A survey by Heavy
Reading of operators
(2014) indicated that
less than 30% could
use their existing
PCRF to handle
VoLTE
IN systems are
struggling to deliver
flexibility and have
high cost. New
services such as
VoLTE are causing
network operators to
evaluate existing
charging systems
30%

8. VoLTE Operator Roadmap
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• Improve voice quality
• Shorten call setup time
• Improve innovation image
• Platform for competing with
OTT
• Build new services on existing
VoLTE architecture
• Video Calling, Advanced
Messaging, Advanced Voice
Services
• Reduce CS dependency
• Remove CS Network
infrastructure
• Reuse old Voice/SMS Spectrum
for data services
Short Term Medium Term Long Term

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Overview
Why? When? How?

10. 11
HD Voice and VoLTE Deployments
Live VoLTE Networks
Source: GSA Report September 19 2014
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11. LTE to VoLTE Timelines
11 - 2010 06 - 2011 12 - 2011 07 - 2012 01 - 2013 08 - 2013 03 - 2014 09 - 2014
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Verizon
NTT Docomo
SK Telecom
LG U+
AT&T Mobility
Singtel
KT
HKT-PCCW
3 HK
Starhub
T-Mobile
Time from LTE
launch to
VoLTE launch
Average length
of time is 24.6
Months

12. LTE to VoLTE Timelines
11 - 2010 06 - 2011 12 - 2011 07 - 2012 01 - 2013 08 - 2013 03 - 2014 09 - 2014
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Verizon
NTT Docomo
SK Telecom
LG U+
AT&T Mobility
Singtel
KT
HKT-PCCW
3 HK
Starhub
T-Mobile
Time from LTE
launch to
VoLTE launch
Correlation in
each market

13. Plans to Deploy Policy Use Cases
• Question: Which of
the following use
cases will your
company deploy in its
network?
• Source: Heavy Reading
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Overview
Why? When? How?

15. VoLTE and BSS Systems
• VoLTE requires co-ordination across policy & charging control
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elements
• Policy system (PCRF) on the call path and defines dedicated voice QoS
• Dynamically manage resources for each VoLTE call
• Flexible charging to zero rate VoLTE control traffic, support legacy
voice tariffs and new flexible bundled propositions.

16. 1,000,000
900,000
800,000
700,000
600,000
500,000
400,000
300,000
200,000
100,000
Subscribers and Sessions
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Scalability
0
1 2 3 4 5 6 7 8 9 10
Num Subscribers IP-CAN Sessions
• Sessions and signalling
will increase in-line with
the number of
subscribers
• Slow initial adoption will
lead to rapid growth
following typical growth
curve
• Large increase in sessions
and signalling
Can you handle > 1M TPS?

17. Emergency
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Resiliency
Severity of Failure

18. Reporting and Accountability
• VoLTE systems must
allow rapid
detection of failures
• If there is an issue
with calls, you need
to know why. Fast.
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19. Ease of deployment and management
• VoLTE systems should be
simple to deploy and manage
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• Scaling must be
straightforward
• Delivery and charging for
VoLTE services
• Fixed, simple to manage
• NFV approach enables
simplified management,
deployment and scaling
• VNF-Manager combined with
VNFs for BSS systems

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Functionality

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Catalyst for Change
• VoLTE represents an
opportunity to change
inadequate systems
• Given the requirements of
VoLTE, existing systems may
not be adequate
• Reliability, scalability etc.
• Functionality
• Licensing/contractual terms
Heavy Reading 2014 operator survey
• VoLTE charging is Diameter based
• Upgrade an existing system, or use this as an
opportunity to deploy a new charging system
• NFV and Virtualization can be utilised in order to
simplify this migration

22. VoLTE – The beginning of the end for traditional billing
and IN charging systems?
• Voice and data – both are
now data centric
• Data calls priced as voice
(e.g. zero rate data
traffic, rate as voice call)
• Different interfaces
required
• Can IN systems deliver
flexibility required?
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Adjunct Systems

24. VoLTE presents an opportunity
for mobile networks to deliver
a premium product
but it must be executed
correctly
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25. Thank You
bart.lehane@openet.com
http://www.openet.com/ltevoice