3GPP workshop on LTE in unlicensed spectrum (chairman summary)

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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

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  • Re: 2nd bullet:
  • 3GPP workshop on LTE in unlicensed spectrum (chairman summary)

    1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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)

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