This document is my synthesis of the workshop contributions and discussion, hoping that it can help companies achieve convergence in follow-up discussions on this subject The document discusses the main deployment options and requirements emerging from the discussion The point here is not to note every single variant that was mentioned! Options or requirements that did not receive enough attention can be discussed offline among interested companies, and if consensus emerges around them, they can be later captured in future SI proposals

1. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 1
Chairman Summary
3GPP workshop on LTE in unlicensed spectrum
Sophia Antipolis, France,
June 13, 2014
Dino Flore
TSG-RAN Chairman

2. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 2
DISCLAIMER
This document is my synthesis of the workshop
contributions and discussion, hoping that it can help
companies achieve convergence in follow-up discussions
on this subject
The document discusses the main deployment options
and requirements emerging from the discussion
• The point here is not to note every single variant that was
mentioned! Options or requirements that did not receive
enough attention can be discussed offline among interested
companies, and if consensus emerges around them, they can be
later captured in future SI proposals

3. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 3
Motivation
Licensed spectrum remains 3GPP operators’ top priority
to deliver advanced services and better user experience
Opportunistic use of unlicensed spectrum will be an
important complement to meet future traffic demand
The new feature can be an attractive option for
operators to utilize unlicensed spectrum with a unified
network
•Offering potential operational cost saving, improved spectral
efficiency and better user experience

4. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 4
Target Frequencies
Most of the companies indicated that we should first
focus on unlicensed operation in 5 GHz
Other frequencies were mentioned in few contributions,
but unless consensus emerges around those in follow up
discussions, these can be addressed at later time
In any case, the core technology should be as much as
possible frequency agnostic so that, if needed, it can be
later ported to other frequencies

5. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 5
Regulatory Landscape
Many companies provided an overview of the
regulatory requirements for unlicensed operation in
5 GHz
Different regional requirements emerged, in terms
of power levels, channel sensing etc.
Most of the companies prefer 3GPP to focus on the
standardization of a global solution that can work
across regions

6. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 6
Deployment scenarios &
modes of operation
Strong interest to study both indoor and outdoor
deployments
Debate on deployment models and corresponding
modes of operation to be studied (see next slide):
Deployment model Mode of operation
Co-located cells
Licensed-Assisted
Carrier Aggregation
Non co-located cells w/ ideal backhaul
Non co-located cells w/out ideal backhaul Dual Connectivity
Standalone cells Standalone

7. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 7
Debate on modes of operation
Strong interest to start first with Licensed-Assisted Carrier Aggregation
operation leveraging on the existing LTE Carrier Aggregation framework
• Two available options:
(1) Cells on unlicensed spectrum used for downlink only
(2) Cells on unlicensed spectrum used for both downlink and uplink
• Many companies propose to start working on (1) then follow with (2)
Most of the companies see the value to study Licensed-Assisted Dual
Connectivity operation as well, but prefer to do so at later time
• The feature will hopefully leverage on the Dual Connectivity feature currently
being developed in Rel-12
Diverging opinions on Standalone operation
• Some companies proposed to study also this mode; some companies explicitly
requested not to study it.
• It seems hard to start this option at this time. But it can be re-assessed in the
future.

8. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 8
Main emerging requirements
Need for a global solution
• Addressing the regulatory requirements of different regions
• Trying to harmonize as much as possible band definition(s)
Coexistence requirements
• Coexistence with Wifi
• Coexistence among cells from the same or different operators
RAN should also look at possible in-device coexistence
issues

9. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 9
Performance Results
Multiple contributions provided promising initial
simulation results
Initial results show that, when augmented with the
appropriate coexistence mechanisms to operate in
unlicensed spectrum, e.g. Listen-Before-Talk, LTE can
effectively coexist with Wifi and outperform it in
terms of spectral efficiency

10. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 10
Workplan considerations
Interested companies should converge offline on a SI proposal clearly
defining the scope of the technical work
• No need of further RAN plenary discussions simply to document all options and
requirements that have been mentioned, nor to start technical discussions in RAN
• On the other hand, it is highly recommended to focus the technical work by
carefully selecting (or phasing) among the main options and requirements
• Technical work should start in RAN1 with the definition of the exact evaluation
methodology, the study of the necessary enablers and coexistence scenarios
• Once RAN1 has sufficiently progressed with the study, work can then follow in other WGs,
including RAN4 work on the exact new band(s) specification
SI proposal to be discussed in the regular approval process in Sept

11. © 3GPP 2009 Mobile World Congress, Barcelona, 19th
February 2009© 3GPP 2013 RWS-140029 Chairman Summary 11
Others
Naming conventions
• Some criticality emerged on the naming convention to be
used in future 3GPP discussions
• The current SI proposal focuses on carrier aggregation
operations and uses the acronym LAA (Licensed Assisted
Access)