Project’s Overview
Date: Thursday, March 24th 2011
Alexandre Gouraud (Orange)
Canada-EU Future Internet Workshop, Waterloo
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Outline
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ARTIST4G drivers
Objectives
Organisation
Our research beyond LTE-A
Dissemination
Conclusion
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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
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Objectives and Concepts
 Reduce the discrepancies between cell-edge and
cell center performances
 Either via densification
 Or in limiting the interferences
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Project Organisation (1/2)
Innovation activities: main research directions
WP4 Architectural Impacts on RAN
WP1
Interference
avoidance
WP2
Interference
exploitation
WP3
Advanced
Relay
Concepts
WP5 Requirements and evaluation
WP6 Lab and field trials
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Transversal supporting activities
WP0 Management
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Project Organisation (2/2)
1200 mm
WP2
WP3
WP1
WP4
WP5
WP6
WP0
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EASY-C Test Bed Re-used in
ARTIST4G
Milestones:
- Sept 2011: End of implementations
- June 2012: Demonstration
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A Group of Partners Gathering
Required Skills
Chalmers University of
Technology
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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
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Advanced Channel Prediction
LTE-A
 Channel measurement
 Used in many techniques
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SU/MU-MIMO
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Beamforming
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SDMA
•
Link Adaptation
 Traditional prediction:
Kalman or Wiener filter
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Limited prediction horizon
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Fail in birth-death of multipath
components
 New scheme: model-based
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 Accuracy limited by
feedback overhead
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ARTIST4G
3D location + moving vector
 Real world study:
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Using LTE Test-bed
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Promising results although
complex in term of processing
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Coordinated Multi-Point (CoMP)
LTE-A
 Study item stopped
in R10
 Not included in LTE
R10
• Technology not mature
enough
 Study Item R11
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ARTIST4G
 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 macrodiversity and interference
avoidance
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3D-Beamforming
LTE-A
 This concept is not
part of LTE R10
ARTIST4G
 Conventional fixed
down-tilt causes
interference
 Objective: exploit also
elevation dimension
 Ground breaking
innovation
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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
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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)
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various functions in the receiver collaborate (e.g. channel estimator, decoder) to
extract the information
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Advanced Relays
LTE-A features
ARTIST4G innovations
 The relay standardized in LTE-A  Advanced relays need to
provide capacity in addition to
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)
coverage
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CoMP on the relay feeder link.
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Multi-hop relays
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Moving relays
 Foreseen main scenario:
coverage enhancement
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Toward a more uniform QoS
LTE-A
 Target Peak/Average
performances
 From release to release,
average over cell-edge
ratio of throughput
increases
ARTIST4G
 Focus on a more
uniform Qos
 Use a new performance
indicator:
 Jain index applied on
User throughput
distribution
 Adopted by 3GPP
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Dissemination
 Web site at : https://ict-artist4g.eu
 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)
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Thank you !
Questions?
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