Embedding Multiple Self-Organisation Functionalities in Future Radio ...

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Feb 16, 2009 - 1. Introduction. 2. Dependencies between control parameters. 3. Interactions between SON functionalities. 4. SON Control and Coordination.
FP7 ICT-SOCRATES

Embedding Multiple Self-Organisation Functionalities in Future Radio Access Networks 7th COST 2100 Committee Meeting February 16th - 18th 2009 Braunschweig, Germany Authors:

T. Jansen, TU Braunschweig, Braunschweig M. Amirijoo , Ericsson, Linköping Ulrich Türke, atesio, Berlin L. Jorguseski, TNO ICT, Delft K. Zetterberg, Ericsson, Linköping R. Nascimento, TNO ICT, Delft John Turk, Vodafone, Newbury L. C. Schmelz, Nokia Siemens Networks, Munich I. Balan, IBBT, Antwerp

Outline 1. Introduction 2. Dependencies between control parameters 3. Interactions between SON functionalities 4. SON Control and Coordination

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Objectives of the SOCRATES-Project  Increase the network performance – Quality of service, System capacity, Throughput, …  Reduce the effort of human intervention – Automate optimisation processes – Fast adaptation to network conditions  Reduce operating costs – Energy consumption – Operational expenditure (OPEX)  Continuously collecting measurements – UE measurements – Cell measurements – Information exchange between eNodeB’s WWW.FP7-SOCRATES.EU

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Measurements (Gathering and processing)

Continuous loop

Setting parameters

SelfConfiguration

Triggered by incidental events

SelfHealing

SelfOptimisation

SON functionalities considered for LTE  SOCRATES investigated 24 use cases – Use cases address situations where self-organisation may be of benefit – Divided into 3 categories [1]  Self-Optimisation

 Self-Configuration

 Self-Healing

– Interference

– Automatic generation of

– Cell outage

coordination – Handover optimisation – SO of home eNodeB – …

default parameters – Intelligently selecting site locations – …

detection – Cell outage compensation – Coverage hole management – …

 SON algorithms will be developed in every use case group

Multiple SON functionalities will be active at the same time

[1] Reference: TD (08)616, “Use Cases, Requirements and Assessment Criteria for Future Self‐Organising  Radio Access Networks”, COST2100, Lille, France, October 2008 WWW.FP7-SOCRATES.EU

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Introduction  SON functionalities – Alter some parameter settings – Interact with other SON functionalities  Problems – Different SON functionalities alter the same parameter settings – for the same reason – for different reasons – Overall performance depends on multiple SON functionalities

Measurement Plane

Error reports

SelfOrganisation Plane

Funct. 1

Parameter Plane

Parameter 1

...

UE measurements

Funct. 2

Parameter 2

Funct. 3



Parameter x

It is necessary to analyse the interaction of the SON functionalities based on the control parameters and interaction with other use cases that follow the same purpose to identify the functionalities that need to be coordinated and simulated together WWW.FP7-SOCRATES.EU

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Outline 1. Introduction 2. Dependencies between control parameters 3. Interactions between SON functionalities 4. SON Control and Coordination

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Definitions used for parameter grouping  Definition of a Goal – Example: minimise inter-cell interference, maximise capacity  Definition of Parameter – Example: transmission power, antenna parameters  A parameter affects one or several goals

through a Contributor relation  Goals and controlled parameters defined

for all use cases  Objective: Determine the parameters that

need to be coordinated WWW.FP7-SOCRATES.EU

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Use C ase B SO N functionality B Use C ase A SO N functionality A Goal A

Parameter

Goal B

Contributor Relation

Coupling between groups and forming the groups  A group consists of – Goals that are coupled through a contributor relation – Parameters of coupled groups

 Parameter in one group does not

affect the goals of other groups  No coupling between the group A and group B  Coordination is – required within group

Parameter G roup A Parameter G roup B

– Not required between groups

 Methodology for deriving the groups 1. Inventory of the goals 2. Identify the parameters that affect the goals 3. Form the parameter groups WWW.FP7-SOCRATES.EU

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Goal A

Parameter

Goal B

Contributor Relation

Goal C

Identifying the parameters Goal Minimise interference

Transmit power RB assignment Adjust beam forming parameters CQI thresholds for schemes switching

Maximise/Optimise coverage

Transmit power Antenna parameters

Balance load

Transmit power Antenna parameters HO parameters Cell reselection parameters

Minimise energy consumption

Transmit power Antenna parameters Number of used Tx antennas

Maximise cell capacity

Transmit power Admission control threshold Congestion detection and resolution parameters Scheduler parameters Link level retransmission scheme parameters Tracking area parameters Switching point configuration CQI thresholds for schemes switching

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Parameter(s)

Forming the parameter groups Parameter Group

Parameter(s)

A

Minimise interference Balance load Minimise energy consumption Maximise cell capacity Maximise/optimise network coverage Maximise HO performance

Transmit Power Antenna parameters RB assignment HO parameters Admission control threshold Congestion detection and resolution parameters Scheduler parameters Link level retransmission scheme parameters Cell reselection parameters Number of used Tx antennas Switching point configuration Adjust beam forming parameters CQI thresholds for schemes switching Tracking area parameters

B

Minimise error rate

Channel power control parameters

C

Maximise access probability

RACH configuration

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Goal(s)

Outline 1. Introduction 2. Dependencies between control parameters 3. Interactions between SON functionalities 4. SON Control and Coordination

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Definitions used to determine the interaction of SON functionalities  Trigger – A trigger initiates a SON functionality

SON Functionality

SON Functionality

Trigger

SON Functionality

 SON functionalities trigger each other – One SON functionality finished the optimisation and triggers another one

 Co-Operate – Several SON functionalities are activated at the same time to counteract the same system performance degradation

SON Functionality Information exchange SON Functionality

 Co-Act – SON functionalities have been initiated by different triggers and influence the same parameter settings for different purposes

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Information exchange SON Functionality

Interaction of SON functionalities  Co-Operating and Co-Acting SON functionalities – need to be coordinated – need o be simulated together  Analysis of interaction is based on Triggers – Low / High Blocking – Low / High Dropping – Low / High Quality of service – Low / High / Imbalanced Traffic load – Low / High Cell capacity – New site – Cell outage – Coverage hole  Which SON functionalities need to

be initiated ?? WWW.FP7-SOCRATES.EU

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Trigger

SON Functionality

SON Functionality

SON Functionality

Interaction of SON functionalities for the Trigger Dropped Calls

Reduction of energy cons. Congestion control

w lo

Information exchange

Dropped calls If no

hi gh

thing

turn

ff ed O

SO of Home eNodeB

Admission control

If Problem solved

SO of physical channels

Information exchange

Reduction of energy cons. If no turn

thing

ed O ff

Coverage Hole detection

No Hole detected

Interference coordination

If Problem solved

RACH opt.

Information exchange Coverage Hole compensation

Hole is compensated

Load balancing

Information exchange Handover parameter opt.

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If Problem not solved

Intelligently selecting site location

Interaction of SON functionalities for all Triggers Trigger

Co-Operating SON functionalities

Blocking

Admission control, Load balancing, Handover parameter optimisation, RACH optimisation

Dropping

Congestion control, Admission control, Interference coordination, Load balancing, Handover parameter optimisation

Quality of Service

Congestion control, Interference coordination, TDD UL/DL switching point, Link level retransmission scheme

Traffic load

Congestion control, TDD UL/DL switching point, Load balancing

Cell capacity New site Cell outage Coverage hole

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Interference coordination, Load balancing, Handover parameter optimisation, Coverage hole detection

Outline 1. Introduction 2. Dependencies between control parameters 3. Interactions between SON functionalities 4. SON Control and Coordination

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SON control and coordination  Coupling between parameters – Changed parameter settings affect several SON goals

 Interaction of SON functionalities – Several SON functionalities cooperate to counteract the system performance degradation

Control and Coordination of SON functionalities is essential  Approach for managing interaction

and coordination

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Measurement Plane

Control Plane

Oper. policy

Coordination Plane

...

Funct. 1

Funct. 2

Funct. 3

Funct. 5

Funct. 4

Parameter Plane

Oper. policy

UE measurements

(SON-) Controller

QoS

Trigger Plane

SelfOrganisation Plane

...

Error reports

Blocked calls

Funct. 4

Funct. 6

(SON-) Coordinator

Parameter 1

...

Parameter x

FP7 ICT-SOCRATES

Thank you very much for your attention