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A Study on Performance Enhancements for High Speed Uplink Packet Access
Frans Laakso
Presentation 1
Postgraduate Seminar
April 16th, 2012
Outline
Presentation 1
Thesis status
General introduction & motivation
Simulators & tools
Scenario & topics
Uplink Transmit Diversity & Beamforming introduction
Presentation 2
In depth view into beamforming
Weight calculation & pre-coding
Feedback mechanisms
Codebook
Performance
Conclusion
2 © 2010 Magister Solutions Ltd
Outline – Presentation 1
Introduction
Background
Thesis
Articles
Research
Focus & Motivation
Research Topics
Used Tools
Simulators
Scenario
ULTD study item & beamforming introduction
3 © 2010 Magister Solutions Ltd
Thesis
Working Title:
A Study on Performance Enhancements for High Speed Uplink Packet Access
Type:
Collection of Papers
Advisors:
Prof. Tapani Ristaniemi, JYU
Dr. Janne Kurjenniemi, Magister Solutions Ltd.
Duration:
January 2010 - December 2013
ETCS:
37/60
Articles & journals
11 articles published, 2 submitted for review, 1 in progress
2 journals planned
4 © 2010 Magister Solutions Ltd
Articles (1/3)
1. "Applicability of Interference Coordination in Highly Loaded HSUPA Network", Frans Laakso, Kari Aho, Thomas Chapman, Tapani Ristaniemi, IEEE 71st Vehicular Technology Conference: VTC2010-Spring, 16 – 19 May 2010, Taipei, Taiwan.
2. “Enhancing HSUPA System Level Performance with Dual Carrier Capability”, Ilmari Repo, Kari Aho, Sami Hakola, Thomas Chapman, Frans Laakso, 5th IEEE International Symposium on Wireless Pervasive Computing (ISWPC), 5 – 7 May 2010, Modena, Italy.
3. "Extended HSUPA Coverage and Enhanced Battery Saving Opportunities with Multiple TTI Lengths", Frans Laakso, Kari Aho, Ilmari Repo, Thomas Chapman, 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2010), 26 – 29 September 2010, Istanbul, Turkey.
4. "Streamlining HSUPA TTI Lengths without Compromising HSUPA Capacity", Frans Laakso, Kari Aho, Ilmari Repo, Thomas Chapman, IEEE 73rd Vehicular Technology Conference: VTC2011-Spring, 15 – 18 May 2011, Budapest, Hungary.
5. "On HSUPA Open Loop Switched Antenna Transmit Diversity Performance in Varying Load Conditions", Petri Eskelinen, Ilmari Repo, Kari Aho, Frans Laakso, IEEE 73rd Vehicular Technology Conference: VTC2011-Spring, 15 – 18 May 2011, Budapest, Hungary.
5 © 2010 Magister Solutions Ltd
Articles (2/3)
6. “Switched Antenna Transmit Diversity Imperfections and Their Implications to HSUPA Performance”, Ilmari Repo, Kari Aho, Petri Eskelinen, Frans Laakso, 2011 18th International Conference on Telecommunications, 8 – 11 May 2011, Ayia Napa, Cyprus.
7. “Introducing Switched Antenna Transmit Diversity for High Speed Uplink Packet Access”, Kari Aho, Ilmari Repo, Petri Eskelinen, Frans Laakso, 2011 18th International Conference on Telecommunications, 8 – 11 May 2011, Ayia Napa, Cyprus.
8. "Introducing Dual Pilot Closed Loop Transmit Diversity for High Speed Uplink Packet Access", Tuomas Hiltunen, Frans Laakso, Petri Eskelinen, Kari Aho, Ilmari Repo, Arto Lehti, IEEE 74th Vehicular Technology Conference: VTC2011-Fall, 5 – 8 September 2011, San Francisco, United States of America.
9. "Beamforming Transmit Diversity Using Power Control Commands for High Speed Uplink Packet Access", Frans Laakso, Kari Aho, Ilmari Repo, Petri Eskelinen, Marko Lampinen, IEEE 74th Vehicular Technology Conference: VTC2011-Fall, 5 – 8 September 2011, San Francisco, United States of America.
10. "Impact of Practical Codebook Limitations on HSUPA Closed Loop Transmit Diversity", Petri Eskelinen, Frans Laakso, Kari Aho, Tuomas Hiltunen, Ilmari Repo, Arto Lehti, IEEE 74th Vehicular Technology Conference: VTC2011-Fall, 5 – 8 September 2011, San Francisco, United States of America.
6 © 2010 Magister Solutions Ltd
Articles (3/3)
11. "Impact of Amplitude Component on HSUPA Closed Loop Transmit Diversity Performance", Petri Eskelinen, Frans Laakso, Marko Lampinen, IEEE 75th Vehicular Technology Conference: VTC2012-Spring, 6 – 9 May 2012, Yokohama, Japan.
12. "Performance of Absolute and Recursive Feedback Methods with HSUPA Closed Loop Transmit Diversity", Frans Laakso, Petri Eskelinen, Marko Lampinen, 23rd Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2012), 9 – 12 September 2012, Sydney, Australia.
13. "Uplink Weight Signaling for HSUPA Closed Loop Transmit Diversity", Frans Laakso, Petri Eskelinen, Marko Lampinen, 23rd Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2012), 9 – 12 September 2012, Sydney, Australia.
7 © 2010 Magister Solutions Ltd
Focus & Motivation
Focus on HSUPA
All research is based on 3GPP standardization work
Improvements are suggested, discussed and evaluated
Suitable ones are standardized
DC-HSUPA (release 9)
HSPA+ Advanced
Antenna techniques
MIMO, CLTD, …
MC-HSPA + 4x4 MIMO (release 11)
672 Mbit/s
8 © 2010 Magister Solutions Ltd
Research Topics
Interference coordination
Dual / Multicarrier
VoIP
Mixed TTI
Range Extension
Transmit Diversity
Antenna Switching
Beamforming
Open Loop
Closed Loop
9 © 2010 Magister Solutions Ltd
Used Tools
Proprietary quasi-static system level radio access network simulators from Nokia, NSN & Renesas Mobile Europe
MatLab (post processing)
10 © 2010 Magister Solutions Ltd
Simulators (1/3)
Different ways of dividing simulators
Running principle:
discrete event, continuous, …
Level of detail:
static, quasi-static, dynamic, …
Modeling purpose:
wireless radio access, wired, …
Confidentiality:
proprietary, open
11 © 2010 Magister Solutions Ltd
Simulators (2/3)
Link-level simulations
Multiple-Input Multiple-Output (MIMO) gains
Adaptive Modulation and Coding (AMC) feedback
Modeling of channel encoding and decoding
Physical layer modeling for system-level
System-level simulations
Scheduling
Mobility handling
Interference management
Signaling
12 © 2010 Magister Solutions Ltd
Uplink Transmit Diversity
The uplink transmit diversity schemes may be categorized into two types of algorithms:
transmission from 1 Tx antenna (e.g. switched antenna Tx diversity)
simultaneous transmission from 2 Tx antennas (e.g. transmit beamforming)
The work under this study item aims at:
evaluating the potential benefits of the indicated UL Tx diversity techniques
investigating the impacts on the UE implementation
investigating how to ensure that the UE operating an uplink Tx diversity will not cause any detrimental effects to overall system performance
investigating the impacts of Tx diversity on existing BS and UE RF and demodulation performance requirements
analyzing how to derive any additional performance/test requirements that are deemed needed as an outcome of the study, as well as understanding the impacts of any such new requirements
http://www.3gpp.org/ftp/Specs/html-info/25863.htm
16 © 2010 Magister Solutions Ltd
Open Loop Beamforming (2/2)
Practical BFTD Algorithm 2 in CELL_DCH:
This algorithm periodically adds a phase offset to the relative phase of the two transmit signals
The existing uplink power control command is used as the feedback and is input into the algorithm
The algorithm then determines the suitable phase is in the region of larger radian (degrees) or in the region of smaller radian (degrees) and make a phase move (or not move at all)
The transmit beam is formed and dynamically steered toward the serving base station that is power controlling the UE by the relative phase (plus the phase difference by the path difference and fading)
18 © 2010 Magister Solutions Ltd
Future – Presentation 2
In depth view into beamforming
Weight calculation & pre-coding
Feedback mechanisms
Codebook
Performance
Conclusion & standardization status
20 © 2010 Magister Solutions Ltd
21 © 2008 Magister Solutions Ltd
Thank you!
21 © 2010 Magister Solutions Ltd
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