Radio Access Networks 7 th COST 2100 Committee Meeting February 16 th - PowerPoint PPT Presentation

FP7 ICT-SOCRATES Embedding Multiple Self-Organisation Functionalities in Future Radio Access Networks 7 th COST 2100 Committee Meeting February 16 th - 18 th 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 WWW.FP7-SOCRATES.EU 2/17

Objectives of the SOCRATES-Project  Increase the network performance – Quality of service, System capacity, Throughput, … Measurements (Gathering and processing)  Reduce the effort of human intervention – Automate optimisation processes Continuous – Fast adaptation to network conditions loop Self- Optimisation Setting  Reduce operating costs parameters – Energy consumption – Operational expenditure (OPEX) Self- Configuration Self- Healing  Continuously collecting measurements – UE measurements Triggered by incidental – Cell measurements events – Information exchange between eNodeB’s WWW.FP7-SOCRATES.EU 3/17

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 default parameters detection – Handover – Intelligently selecting site – Cell outage optimisation locations compensation – SO of home – … – Coverage hole eNodeB 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 4/17

Introduction  SON functionalities – Alter some parameter settings . . . – Interact with other SON Measurement Error UE Plane reports measurements functionalities  Problems Self- Funct. Funct. Funct. Organisation 1 2 3 Plane – Different SON functionalities alter the same parameter settings – for the same reason … Parameter Parameter 1 Parameter 2 Parameter x Plane – for different reasons – Overall performance depends on multiple SON functionalities It is necessary to analyse the interaction of the SON functionalities based on t he 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 5/17

Outline 1. Introduction 2. Dependencies between control parameters 3. Interactions between SON functionalities 4. SON Control and Coordination WWW.FP7-SOCRATES.EU 6/17

Definitions used for parameter grouping  Definition of a Goal – Example: minimise inter-cell interference, maximise capacity  Definition of Parameter – Example: transmission power, antenna parameters U s e Ca s e B SON fun c tionality B  A parameter affects one or several goals U s e Ca s e A through a Contributor relation SON fun c tionalityA Goal A Param e t e r  Goals and controlled parameters defined Goal B Contributor for all use cases R e lation  Objective: Determine the parameters that need to be coordinated WWW.FP7-SOCRATES.EU 7/17

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 Param e t e r Group A – required within group Param e t e r Group B – Not required between groups Goal A Parameter  Methodology for deriving the groups Goal B Contributor Inventory of the goals 1. Relation Goal C Identify the parameters that affect 2. the goals Form the parameter groups 3. WWW.FP7-SOCRATES.EU 8/17

Identifying the parameters Goal Parameter(s) 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 WWW.FP7-SOCRATES.EU 9/17

Forming the parameter groups Parameter Goal(s) Parameter(s) Group A Minimise interference Transmit Power Balance load Antenna parameters Minimise energy consumption RB assignment Maximise cell capacity HO parameters Maximise/optimise network Admission control threshold coverage Congestion detection and resolution Maximise HO performance 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 WWW.FP7-SOCRATES.EU 10/17

Outline 1. Introduction 2. Dependencies between control parameters 3. Interactions between SON functionalities 4. SON Control and Coordination WWW.FP7-SOCRATES.EU 11/17

Definitions used to determine the interaction of SON functionalities  Trigger SON Trigger – A trigger initiates a SON functionality Functionality  SON functionalities trigger each other SON SON – One SON functionality finished the Functionality Functionality optimisation and triggers another one  Co-Operate SON – Several SON functionalities are activated at Functionality the same time to counteract the same system Information exchange performance degradation SON Functionality  Co-Act Information exchange – SON functionalities have been initiated by SON different triggers and influence the same Functionality parameter settings for different purposes WWW.FP7-SOCRATES.EU 12/17

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 Trigger – Low / High Quality of service – Low / High / Imbalanced Traffic load – Low / High Cell capacity SON SON Functionality Functionality – New site – Cell outage – Coverage hole SON Functionality  Which SON functionalities need to be initiated ?? WWW.FP7-SOCRATES.EU 13/17

Interaction of SON functionalities for the Trigger Dropped Calls Reduction of energy cons. Congestion w o l control Information Dropped exchange calls If Problem SO of Home Admission SO of physical g n h i t o n I f eNodeB control channels solved h f f O i g d e h r n u t Reduction of Information energy cons. exchange I f n o t h i n g No Hole If Problem Coverage Hole Interference t u r RACH opt. n e d O detection f f coordination detected solved Information exchange Intelligently Hole is If Problem Coverage Hole Load balancing selecting site compensation compensated not solved location Information exchange Handover parameter opt. WWW.FP7-SOCRATES.EU 14/17

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 Interference coordination, Load balancing, Handover parameter optimisation, Coverage hole detection Cell outage Coverage hole WWW.FP7-SOCRATES.EU 15/17

Outline 1. Introduction 2. Dependencies between control parameters 3. Interactions between SON functionalities 4. SON Control and Coordination WWW.FP7-SOCRATES.EU 16/17

SON control and coordination . . . Measurement Error UE  Coupling between parameters Plane reports measurements – Changed parameter settings affect several SON goals Oper. Control Plane (SON-) Controller policy  Interaction of SON functionalities . . . – Several SON functionalities co- Blocked Trigger Plane QoS calls operate to counteract the system performance degradation Funct. Funct. Funct. Funct. 1 2 3 4 Self- Organisation Plane Control and Coordination of Funct. Funct. Funct. 5 4 6 SON functionalities is essential Coordination Oper. (SON-) Coordinator policy Plane  Approach for managing interaction . . . Parameter Parameter 1 Parameter x and coordination Plane WWW.FP7-SOCRATES.EU 17/17