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
