Self-Management for Unified Heterogeneous Radio Access Networks ISWCS 2015 Twelfth International Symposium on Wireless Communication Systems Brussels,

Self-Management for

UnifiedHeterogeneous Radio Access

NetworksISWCS 2015

Twelfth International Symposium on Wireless

Communication Systems

Brussels, Belgium

August 25, 2015

Session 2Chair: Mehdi Amirijoo

SON for future networks: SEMAFOUR highlights and resultsMehdi Amirijoo - Ericsson, Sweden

Multi-layer LTE/Wi-Fi traffic steering: from load control tothroughput optimisationYu Wang - Ericsson, Sweden

Steering users based on their mobility behaviour in multi-RATnetworksBart Sas - iMinds, Belgium

AAS evolution: SON solutions for vertical & virtual sectorisationKonstantinos Trichias - TNO, The Netherlands

Dynamic spectrum allocation for shared use of GSM and LTENils Dreyer - Technische Universität Braunschweig, Germany

Workshop Program

2 Workshop on Self-Management for Unified Heterogeneous Radio Access Networks, August 25, 2015

SON for Future Networks: SEMAFOUR Highlights and Results

Mehdi Amirijoo

Ericsson Research, Ericsson AB

SEMAFOUR Vision


Decision SupportSystem

SERVICEPROVIDER

NETWORKOPERATOR

HETEROGENEOUS NETWORK

General Network-Oriented Objectives

Network Status related to General Network-Oriented Objectives

Integrated SON Management

PhysicalNetwork

Resources

PhysicalNetwork

Resources

PhysicalNetwork

Resources

Policy-Based SON ManagementM

onito

ring

&D

iagn

osis

Operational SON Coordination

Multi-RAT / Multi-layer SON

WLANMgmt.

2G / 3G SON

LTESON

UNIFIED SELF-MANAGEMENT SYSTEM

SON Functions for Multi RAT and Multi Layer Networks


SON Design Principles

Multi-layer LTE/Wi-Fi Traffic Steering

time

Vertical & Virtual SectorisationUser Steering Based on Mobility Behaviour

Dynamic Spectrum Allocation




time

Vertical & Virtual Sectorisation


User Steering Based on Mobility Behaviour


Operators are using Wi-Fi for offloading– “Carrier grade Wi-Fi”

Current typical UE behavior: Wi-Fi If Coverage

Objective: Steer traffic between multi-layer LTE and Wi-Fi to improve user experience and network efficiency


7

LOAD

LTE Wi-Fi

Average Load

Target

LTE Wi-Fi

Average Load

Target

Predicted LTE throughput

Predicted Wi-Fi throughput? ?

Workshop on Self-Management for Unified Heterogeneous Radio Access Networks, August 25, 2015

Significant improvements compared to “WiFi if coverage”:> 50% mean UE throughput gain, > 150% cell edge throughput gain

Wi-Fi If Coverage

TS SONLTE load control

CSRFixed step size

TS SONiRAT load control

Resource UtilizationFixed step size

TS SONLTE load control

CSRVariable step size

TS SONThroughput controlNo control parameter

adjustment

50%

150%

+9%+16%

+90%

+140%

+22%

+63%

+1%+25%

185%




time





High mobility occurs when– Dense deployment of cells– High velocity users

Short stays have a negative impact– Reduced QoS due to data outage during HO– More drops and HO failures– Increased signalling & data overhead in the core

Objective: design a SON function that– Unnecessary handovers are avoided– Users stay longer in the target cell– Throughput is maintained/improved

Steers users more intelligently based on predicted future mobility behaviour



Evaluated in Hannover scenario. Reduction in short stays and HO failure for users subject to SON feature

Short stays HO failure

SON function OFF 31.6% 29.8%

SON function ON 12.5% * 0% ** Includes only users being subject to High Mobility SON function



SON Design PrinciplesDynamic Spectrum Allocation



time


Active Antenna System (AAS) technology: RF components integrated in the antenna

– UE beam stearing, Separate Tx-Rx tilting, Separate carrier tilting, ...

Studied 2 applications: – Vertical Sectorisation (VS): inner and outer cell– Virtual sectorization (ViS): small cell in macro cell

Many dimensions to optimize, for example– VS & ViS activation– Power and BW split (interference management)– Tilt and location

Objective: design SON algorithms that based on current traffic distribution

– (De)activate VS and ViS– VS power allocation– ViS BW split

Vertical and Virtual Sectorisation


z

x

yq

- f

f

dx

dz

Significant 10th percentile throughput gain (%) of VS SON feature compared to FULL VS

60% of cells

20-80% gain




time

Vertical & Virtual SectorisationMulti-layer LTE/Wi-Fi Traffic Steering



Mobile traffic demand is continuously increasing:

• From Q1 2014 to Q1 2015: data traffic increased by 55%

• Voice traffic remains constant

Scarce frequency spectrum & not optimally used

Dynamic Spectrum Allocation (DSA)


Objective: Optimize spectral usage by dynamically allocate spectrum 1) within LTE (intra-RAT) or 2) across technologies GSM/LTE (inter-RAT)

– Intra-RAT LTE DSA: Reduce interference to highly loaded cell (cell 3) by restricting spectrum of interfering cells (cells 1,2, and 4)

– Multi-RAT DSA: Introduction of LTE in GSM Traffic Channel band

Source: Ericson Mobility Report June 2015Inter-RAT: GSM/LTE: 100% gain in mean user throughput in LTE

GSM/WCDMA only

GSM/WCDMA/ LTE



time






Objective

Avoidance of conflicting SON behavior at design time

Conflict Free SON Design and Methodology Design Principle 1: Separation of Control Design Principle 2: Separation of Concern Design Principle 3: Separation of Time Scales Methodology for detecting potential conflicts at design time


15

SON Function 1 Control

Parameter 1Metric 1

SON Function 2

Control Parameter 2

Metric 2

Goal 1

Goal 2

No undesired interactions between:• Dynamic Spectrum Allocation• WiFi/LTE Traffic Steering• Vertical and virtual sectorization

Potential conflict between High Mobility and Traffic Steering, which can be alleviated by Separation of Concern

Workshop on Self-Management for Unified Heterogeneous Radio Access Networks, August 25, 2015

Significant network performance improvement

Improvement of the spectral usage

Major steps towards lightweight management of RAN

Impact on standardisation

Cutting edge research– New approaches for SON– State of the art simulators using Hannover

scenario

Publications– 13 publications– Best paper award at EuCNC 2015 and

ICWMC 2014

Achievements


http://www.google.se/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCPHm0tjjo8cCFUbpFAodjyUAqQ&url=http://www.3gpp.org/about-3gpp/18-3gpp-logo-use&ei=YFvLVfG2PMbSU4_LgMgK&bvm=bv.99804247,d.d24&psig=AFQjCNG2dWztzXuRUn63gfjbpt9ET6ZQsg&ust=1439476954088944

http://www.google.se/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCLrPxMrpo8cCFQJZFAodplQDTg&url=http://inkgirlpoet.com/2014/07/30/one-thousand-black-feathers-a-somonka/&ei=jmHLVbpQgrJRpqmN8AQ&bvm=bv.99804247,d.d24&psig=AFQjCNHMcYHHonHu3wyYF6OLpSidWWXalA&ust=1439478535448029

Thank you

for your attention

www.fp7-semafour.eu


Session 2Chair: Mehdi Amirijoo

SON for future networks: SEMAFOUR highlights and resultsMehdi Amirijoo - Ericsson, Sweden

Multi-layer LTE/Wi-Fi traffic steering: from load control tothroughput optimisationYu Wang - Ericsson, Sweden

Steering users based on their mobility behaviour in multi-RATnetworksBart Sas - iMinds, Belgium

AAS evolution: SON solutions for vertical & virtual sectorisationKonstantinos Trichias - TNO, The Netherlands

Dynamic spectrum allocation for shared use of GSM and LTENils Dreyer - Technische Universität Braunschweig, Germany

Multi-RAT Multi-Layer Presentations


Documents

Self-Management for Unified Heterogeneous Radio Access Networks ISWCS 2015 Twelfth International Symposium on Wireless Communication Systems Brussels,