A Study on Performance Enhancements for High Speed ...users.jyu.fi/~fransla/pdf/seminar_1_laakso.pdf1. "Applicability of Interference Coordination in Highly Loaded HSUPA Network",

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


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


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.


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.


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.


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


Research Topics

Interference coordination

Dual / Multicarrier

VoIP

Mixed TTI

Range Extension

Transmit Diversity

Antenna Switching

Beamforming

Open Loop

Closed Loop


Used Tools

Proprietary quasi-static system level radio access network simulators from Nokia, NSN & Renesas Mobile Europe

MatLab (post processing)


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


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


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


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)


Future – Presentation 2

In depth view into beamforming

Weight calculation & pre-coding

Feedback mechanisms

Codebook

Performance

Conclusion & standardization status



Thank you!


Documents

A Study on Performance Enhancements for High Speed ...users.jyu.fi/~fransla/pdf/seminar_1_laakso.pdf1. "Applicability of Interference Coordination in Highly Loaded HSUPA Network",