/17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Project’s Overview Date: Thursday, March 24 th 2011 Alexandre Gouraud (Orange) Canada-EU Future Internet Workshop, Waterloo Advanced Radio Interface TechnologIes for 4G SysTems1

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Outline  ARTIST4G drivers  Objectives  Organisation  Our research beyond LTE-A  Dissemination  Conclusion 2

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 ARTIST4G Drivers  Explosion of mobile data traffic due to demanding applications  Operator economic boundaries  An even more uniform Quality of Service  Building on LTE / LTE-advanced current state of the art 3

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Objectives and Concepts  Reduce the discrepancies between cell-edge and cell center performances  Either via densification  Or in limiting the interferences 4

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Project Organisation (1/2) Advanced Radio Interface TechnologIes for 4G SysTems 5 WP1 Interference avoidance WP2 Interference exploitation WP3 Advanced Relay Concepts WP4 Architectural Impacts on RAN WP5 Requirements and evaluation WP6 Lab and field trials WP0 Management Innovation activities: main research directions Transversal supporting activities

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Project Organisation (2/2) 6 WP1 WP3 WP2 WP6 WP4 WP5 WP mm

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 EASY-C Test Bed Re-used in ARTIST4G Milestones: - Sept 2011: End of implementations - June 2012: Demonstration 7

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Chalmers University of Technology A Group of Partners Gathering Required Skills 8

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Our Research Beyond LTE-A  Some examples illustrating our research directions Channel prediction Coordinated Multi-Point transmission (CoMP) 3D beamforming Interference cancelling receivers (not strictly LTE-A standardisation related as it relates to receiver design) Advanced relays 9

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Advanced Channel Prediction  Channel measurement  Used in many techniques SU/MU-MIMO Beamforming SDMA Link Adaptation  Accuracy limited by feedback overhead  Traditional prediction: Kalman or Wiener filter  Limited prediction horizon  Fail in birth-death of multipath components  New scheme: model-based  3D location + moving vector  Real world study:  Using LTE Test-bed  Promising results although complex in term of processing LTE-AARTIST4G 10

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Coordinated Multi-Point (CoMP)  Study item stopped in R10  Not included in LTE R10 Technology not mature enough  Study Item R11 11  A few eNB may jointly contribute to serve a UE Potential to make capacity more smooth and movable to where users are Coordinate and collaborate over multiple ’cells’ for macro- diversity and interference avoidance LTE-AARTIST4G

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 3D-Beamforming  This concept is not part of LTE R10 12  Conventional fixed down-tilt causes interference  Objective: exploit also elevation dimension  Ground breaking innovation LTE-AARTIST4G

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Interference Cancelling  Full orthogonality provides interference avoidance But known to be suboptimal in terms of capacity  Cancelling residual interference increases the capacity through resource re-use But interference is not always easy to estimate  Controlling and structuring the interference opens ways to maximum capacity  Optimality relies in a trade-off between interference avoidance and exploitation  WP2 works on interference cancellation receiver using iterative algorithm (turbo principle) various functions in the receiver collaborate (e.g. channel estimator, decoder) to extract the information 13

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Advanced Relays  The relay standardized in LTE-A has the full eNB functionalities can be seen as an eNodeB with a wireless backhaul operating in LTE spectrum  Expected benefits Reduced cost: no backhaul, low-cost device Easy and quick to deploy (no backhaul, small, low-power)  Foreseen main scenario: coverage enhancement 14  Advanced relays need to provide capacity in addition to coverage  CoMP on the relay feeder link.  Multi-hop relays  Moving relays LTE-A featuresARTIST4G innovations

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Toward a more uniform QoS 15  Target Peak/Average performances  From release to release, average over cell-edge ratio of throughput increases  Focus on a more uniform Qos  Use a new performance indicator:  Jain index applied on User throughput distribution  Adopted by 3GPP LTE-AARTIST4G

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Dissemination  Web site at :  Publications in conferences and magazines 3 journal papers ~ 20 conferences articles in 2010 ~15 papers in 2009 (before ARTIST4G)  A 3GPP contribution on CoMP  A press release  2 issues of the Newsletter (available online) 16

/ 17Advanced Radio Interface TechnologIes for 4G SysTems24/03/2011 Thank you ! Questions? 17