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Self Organizing Network

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Self Organizing Network

  1. 1. Sachidananda Sahu
  2. 2.  Introduction  Why SON  SON In LTE  Drivers for LTE SON  LTE SON Features  LTE SON Framework  LTE SON Architecture  Self Configuration Use Case  PCI Planning Use Case  ANR Use Case  MRO Use Case  Other LTE SON Features  Conclusion  References
  3. 3. Processes of self-organization literally create order out of disorder ~Francis Heylighen
  4. 4.  Self Organizational Network express itself that it organizes the network automatically and reduces the manual intervention.  SON is a collection of procedures or functions for automatic configuration, optimization, diagnostication, and healing of networks.  Things under consideration  Material (Spectrum, Equipment, etc.) - With what things we will do the work.  Human (Engineering time) - Who will do the work.
  5. 5.  The NGMN (Next Generation Mobile Networks Association) first published its SON requirements in 2006.  The concepts quickly picked up by 3GPP in 2008 and rolled into the LTE standardization activities.  Starting with Release 8, 3GPP defines interfaces for SON built upon existing management architecture.  Successive 3GPP releases incorporates additional SON features tracking the expected network evolution stages in time.  Specification for SON and its use cases  TS 36.300 : E-UTRAN Overall Description  TR 32.821 : Study of SON related operation and OAM for home eNB.  TR 32.500 : SON Concepts and Requirements  TR 36.902 : Self Configuring and Self Optimizing Network use cases and solutions
  6. 6.  Reducing manual intervention or least possible human interaction.  Atomization of repetitive process.  Improve runtime operation/optimization based on real time data analysis.  Improving user experience and network performance.  Reduction of OPEX, CAPEX and complexity. Network with out SON Capability Network with SON Capability
  7. 7.  SON Solution can be divided in to three categories 1 Self Configuration 2 Self Optimization 3 Self Healing SON Features Proposed by NGMN
  8. 8. LTE SON Features … 1 Self Configuration  Self-configuration mechanism is desirable during the pre-operational phases of network elements such as network planning and deployment.  Self Configuration Use Cases  Plug & Play : IP Address allocation, Authentication, Software and Configuration Download from OAM, Establish connectivity with other nodes  Planning radio parameters of a new eNB: Physical Cell ID automatic configuration, handover & cell selection thresholds, power settings, etc  Planning transport parameters of a new eNB : SGW gateway nodes  Planning connection for all neighbor nodes: Automatic Neighbor Relation (ANR)  Self test
  9. 9. LTE SON Features … 2 Self Optimization  Self-optimization mechanism is desirable during the operational stage so that network operators get benefits of the dynamic optimization.  Self Optimization Use Cases  Neighbor cell list optimization  Evaluation/addition/deletion of existing neighbor cells  Intra/inter frequency and inter system neighbor cell list optimization  Interference control  Handover parameter optimization (MRO)  Load balancing  Energy savings  RACH load optimization  QoS related parameter optimization
  10. 10. LTE SON Features … 3 Self Healing  Detects problem and solve or mitigate those to avoid user impact.  Self Healing Use Cases  cell outage detection and compensation : Antenna tilt and the cell transmit power  self-recovery of network element (NE) software  self-healing of board faults  Self-diagnosis: create a model to diagnose, learning from past experiences.  Self-healing: automatically start the corrective actions to solve the problem.  Significantly reduce maintenance costs.
  11. 11. 3GPP Proposed SON Framework
  12. 12.  SON can be located as whole functionality block or even split in sub-functionality located in different nodes.  Localization of algorithm and control. Centralized SON Distributed SON Hybrid SON
  13. 13.  Process where newly deployed nodes (eNBs) are configured by automatic installation procedures to get the necessary basic configuration for system operation. Self Configuration Procedure Flow
  14. 14.  Automatically configure the Physical Cell ID of a newly introduced cell and also change the PCI to after detection of problem in PCI planning.  Things to consider :  Collison Free : The PCI of one cell should not be the same as those of his neighbor cells.  Confusion Free : The PCI of the neighbor cells should not be the same. PCI A PCI BPCI A PCI A Collision Based Collision Free PCI A PCI C PCI B PCI A PCI A PCI B Confusion Based Confusion Free
  15. 15.  PCI Planning Approach  Listen on Radio Interface (NLM)  UE assisted PCI detection  X2 Message Based PCI detection  3GPP Messages used for PCI Planning  X2 Set Up Request  X2 Set Up Response  Measurement Report  ENB Configuration Update A Possible Solution
  16. 16.  It aims to set up the neighbor relation automatically as much as possible.  ANR function relies on OAM and UE to report the neighbor cell information. • OAM’s significance • UE Measurement Report ANR with help of UE Measurement
  17. 17.  A Neighbor cell Relation • Source cell knows the ECGI/CGI and PCI of the target cell. • Has an entry in the Neighbor Relation Table for the source cell identifying the target cell. • Has the attributes in this Neighbor Relation Table entry defined, either by O&M or set to default values. ANR Architecture Diagram
  18. 18.  Problem  Manual setting of HO parameters in current 2G/3G systems is a time consuming task and it is also costly.  Incorrect HO parameter setting negatively affect user experience.  Solution  Automatically adjusting the mobility parameters Trigger thresholds,Time to trigger, Hysteresis, NRT, Antenna Remote Electrical Tilt etc  Detecting the cause of Reduce Radio Link Failures and unnecessary handovers and decrease those counts.  To enable adjustment of HO parameters , HO errors, reported by UE, can be notified to eNBs by backhaul signaling.  Too late handover  Too early handover  Handover to the wrong cell
  19. 19.  Too Late Handover • If the UE mobility is faster than the HO parameter settings allow for. • RLF in the source cell before the HO was initiated or during HO procedure. • Terminal re-establishes in a different cell than the source
  20. 20.  Too Early handover • RLF occurs a short time after the HO trigger to the target cell. The HO may or may not be completely successful, depending on the over-the-air-messaging in the target cell. • Terminal re-acquires the system in the source cell
  21. 21.  Wrong Cell handover • RLF occurs a short time after the HO trigger to the target cell. The HO may or may not be completely successful, depending on the over-the-air-messaging in the target cell. • Terminal re-establishes in a different cell than the source or target.
  22. 22.  Mobility Load Balancing  To balance the load between neighbor cells, capacity and handover parameters information are shared between eNBs  MLB Functionality  Load is measured for each cell in its monitoring eNB and information is exchanged over X2.  An algorithm is applied to identify the need to distribute the load between two adjacent cells.  Handover and/or cell reselection parameters are adjusted to enable the load balancing.
  23. 23.  Energy Saving & Interference Reduction  Decreasing power consumption of network elements and reduce greenhouse emission.  The ability of ENB to perform cell deactivation and reactivation based on cell load information and maintaining coverage, capacity and quality of service.  Interference reduction based on cell switch on/off which also increases capacity and quality.  Based on load server information SON server takes decision. 3GPP Supported Messages
  24. 24.  Inter Cell Interference Coordination  Problem  DL Interference  UL Interference  Solution  Avoid Use of same PRBs  Co-ordinate use of PRBs  RACH Optimization  To reduce possible RACH (Random (Random Access Channel) Channel) resources collisions, so configuration information is shared between eNBs.  PRACH‐Configuration information is delivered by the X2 Setup and eNB Configuration Update messages.
  25. 25.  Reduction of human intervention.  Real time optimization of network.  Control in OPEX and CAPEX for operator.  SON are flexible, adaptive, resilient, and scalable. Merits of SON Operational Efficiency ~ Technology Graph
  26. 26.  TS 36.300 - Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Overall description  TR 36.902 : Self Configuring and Self Optimizing Network use cases and solutions  Self-Organizing Networks (SON) in 3GPP LTE Nomor Research  The SOCRATES (Self-Optimisation and self-ConfiguRATion in wirelEss networkS) Project  Benefits of Self-Organizing Networks (SON) for Mobile Operators Journal  https://www.exploregate.com/  https://www.sonlte.com/  http://www.3gpp.org/
  27. 27. THANK YOU!

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