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Carrier Aggregation
Implementation on the
OpenAirInterface Platform
Florian Kaltenberger (Eurecom)
CROWNCOM, 1.6.2016
Motivation
 LTE-Advanced carrier aggregation (CA) is one of the key
features to enable dynamic spectrum access
 It’s als...
OpenAirInterface today
01/06/2016 3
Introduction
 OpenAirInterface
 Open-source implementation of 4G LTE/5G (UE, eNB, EPC)
 Works with popular SDR boards (...
Evolution of LTE Carrier Aggregation
01/06/2016 - p 5
Aggregation of
32 carriers
Experimental
support in OAI
Release 10 carrier aggregation features in OAI*
 2 DL carriers, 1 UL carrier
 Feedback (ACK/NACK & CQI) for both DL carr...
The Femto Application Program Interface (FAPI)
 “LTE MAC Scheduler Interface Specification v1.11”
published by the Femto ...
IS-Wireless scheduler overview
01/06/2016 - - p 8
Main features of the advanced
algorithm:
 Support for Carrier Aggregati...
IS-Wireless scheduler features
 Throughput results obtained with LTE MAC Lab
 See http://is-wireless.com/lte-enb-schedul...
Demo setup
 UE connects on 1 component carrier (CC)
 Second CC can be (de-)activated manually
 Throughput change can be...
Conclusions
 New OpenAirInterface features to enable spectral agile
communication (LSA, ASA, etc)
 Carrier aggregation
...
Thank you!
www.openairinterface.org
01/06/2016 - p 12
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Carrier aggregation implementation on the open airinterface platform

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Presentation conducted by our parter Florian Kaltenberger (Eurecom) during 11th EAI International Conference on Cognitive Radio Oriented Wireless Networks CROWNCOM in 01.06.2016, Grenoble, France.

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Carrier aggregation implementation on the open airinterface platform

  1. 1. Carrier Aggregation Implementation on the OpenAirInterface Platform Florian Kaltenberger (Eurecom) CROWNCOM, 1.6.2016
  2. 2. Motivation  LTE-Advanced carrier aggregation (CA) is one of the key features to enable dynamic spectrum access  It’s also the basis for licensed assisted access (LAA) and licensed shared access (LSA)  Efficiently exploiting CA is not trivial  Challenges in scheduling, load balancing, dynamic carrier activation/deactivation  Experimentation with these techniques not possible with commercial equipment  OpenAirInterface is an open-source implementation of LTE- Advanced  Extended with CA features and scheduler FAPI  Allows integration and innovation of new sharing mechanisms 01/06/2016 - p 2
  3. 3. OpenAirInterface today 01/06/2016 3
  4. 4. Introduction  OpenAirInterface  Open-source implementation of 4G LTE/5G (UE, eNB, EPC)  Works with popular SDR boards (ExpressMIMO, USRP, bladeRF)  Allows real-time experimentation with commercial equipment  Objectives  Bring academia closer to complex real-world systems  Open-source tools to ensure a common R&D and prototyping framework for rapid proof-of-concept designs  Other use cases  Interoperability with 3rd party components (UE, eNB, EPC)  Matlab/Octave tools for non real-time experimentation  Real-time channel sounding (EMOS)  802.11p Modem  System and unitary simulations 01/06/2016 - p 4
  5. 5. Evolution of LTE Carrier Aggregation 01/06/2016 - p 5 Aggregation of 32 carriers Experimental support in OAI
  6. 6. Release 10 carrier aggregation features in OAI*  2 DL carriers, 1 UL carrier  Feedback (ACK/NACK & CQI) for both DL carriers on UL carrier  UE can connect on either carrier  RRC (re-)configuration of secondary component carrier (SCC)  Dynamic activation and de-activation of SCC through MAC signaling  Simple round-robin scheduler  No load balancing or fairness * Available from gitlab.eurecom.fr/oai/openairinterface5g, branch feature-15-carrier-aggregation 01/06/2016 - p 6
  7. 7. The Femto Application Program Interface (FAPI)  “LTE MAC Scheduler Interface Specification v1.11” published by the Femto Forum (now Small Cell Forum) in 2010  Extended in SOLDER project for carrier aggregation  Implemented in OAI*  Integrated with simple scheduler (single carrier) so far * Available from gitlab.eurecom.fr/oai/openairinterface5g, branch feature-31-ff-scheduler-api 01/06/2016 - p 7
  8. 8. IS-Wireless scheduler overview 01/06/2016 - - p 8 Main features of the advanced algorithm:  Support for Carrier Aggregation – activation and deactivation of component carriers  Ability to guarantee GBR traffic  Real-life imperfection corrections – wrong CQI reporting compensation  Multiple priority components  Parametrization (maximizing eNB throughput, fairness, minimizing latency)
  9. 9. IS-Wireless scheduler features  Throughput results obtained with LTE MAC Lab  See http://is-wireless.com/lte-enb-scheduler/ for details 01/06/2016 - p 9
  10. 10. Demo setup  UE connects on 1 component carrier (CC)  Second CC can be (de-)activated manually  Throughput change can be observed via iperf 01/06/2016 - p 10 3rd party EPC OAI eNB + ExpressMIMO2
  11. 11. Conclusions  New OpenAirInterface features to enable spectral agile communication (LSA, ASA, etc)  Carrier aggregation  FAPI for schedulers  OAI is used already in some trials and testbeds  E.g. FLEX  We welcome new users and developers 01/06/2016 - p 11
  12. 12. Thank you! www.openairinterface.org 01/06/2016 - p 12

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