The CTO's Espresso Guide to SON


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The CTO's Espresso Guide to SON

  1. 1. The “Espresso GUIDE” TO SON Mindspeed Technologies Mobile World Congress Feb 27 - March 1, 2012 Nasdaq: MSPD
  2. 2. Introductions Nasdaq: MSPD
  3. 3. Agenda What is SON? Why do we need SON? How? SON implementation A deeper dive : SON techniques for Interference Management Nasdaq: MSPD
  4. 4. WHAT and Why? Nasdaq: MSPD
  5. 5. What is SON? eNB power on (or cable connected) a-1 : configuration of IP address (A) Basic Setup and detection of OAM a-2 : authentication of eNB/NW a-3 : association to aGW Self-Configuration (pre-operational state) a-4 : downloading of eNB software (and operational parameters) (B) Initial Radio b-1 : neighbour list configuration Configuration b-2 : coverage/capacity related parameter configuration Self-Optimisation (operational state) (C) Optimization / c-1 : neighbour list optimisation Adaptation c-2 : coverage and capacity control Nasdaq: MSPD
  6. 6. Why do we need SON?“About 17 % of wireless operator’s “About 24 % of a typical wirelessCAPEX is spent on engineering and operator’s revenue goes to networkinstallation services” OPEX” Self Optimisation and Energy Self Configuration Reduces CAPEX Saving Reduces OPEX Plan Deploy Optimise Maintain “SON will improve the operational Self Optimisation and Self Healing efficiency by >60%” Improves User Experience Nasdaq: MSPD
  7. 7. A new problem… Nasdaq: MSPD
  8. 8. The reality of the macro network Source: Arthur D Little Nasdaq: MSPD
  9. 9. So femtocells… and they “SON”  plug-in and turn on  connects through broadband  ipsec tunnel established to carrier  remote management  listens to network environment  Adjusts and adapts: power levels; carrier; codes Nasdaq: MSPD
  10. 10. Femtocell SON/RRM Development Deployment Modelling System Test IOT and3GPP H(e)NB Recommendations FAP and Carrier Integration VerificationFemto Forum Recommendations Nasdaq: MSPD
  11. 11. Implementing son Measurements, Interfaces, Architectures Nasdaq: MSPD
  12. 12. General 3GPP OAM scenario layout SON: Centralised, Distributed or Hybrid? OSS Layer Home NEM and NE Umbrella Systems NEM ltf-N NEM Supplier A NEM Network Supplier A ltf-P2P Supplier A Element NEM NEM Mgmt Supplier A Supplier B Layer Femto GW Macro NE Layer X2 eNB eNB eNB eNB HeNB HeNB Supplier A Supplier A Supplier B Supplier BOnly these two are standardised: the rest are vendor-specific Nasdaq: MSPD
  13. 13. Categories of SON functionality Stand-alone use cases  Admission Control, Automatic Generation of Default Parameters, Load Balancing, Handover optimisation Integration use cases  Load Balancing AND Handover optimisation SON coordination  an overall framework for the coordination between use cases. Nasdaq: MSPD
  14. 14. Measurements Types Counters Key Performance Indicator (KPI) Alarms Timers Measurements Statistics Nasdaq: MSPD
  15. 15. Measurement Sources and Targets Affected eNodeB:  the eNodeB which is affected by the SON use case Neighbouring eNodeB:  eNodeBs that are neighbours of the affected eNodeB, e.g. those with a handover relationship UE served by the affected eNodeB UE served by neighbour cells that still receives and decodes information from the affected eNodeB The access gateway(s) (aGW) to which the eNodeB is connected The OAM fault management system: Alarms Nasdaq: MSPD
  16. 16. KEEP thenoise down! Interference Mitigation Nasdaq: MSPD
  17. 17. Deployment Considerations Separation between Femto AP Femto can be on a dedicated and macrocellcarrier frequency or co-channel with macro layer. Shared or Dedicated carrier Neighbour macrocell Femto UE Femto AP Indoors or outdoors Macro UE Indoors or outdoors Open, Closed or Hybrid Access “Hybrid” access added in Rel-9 – allows all UEs access the femto but gives priority (higher QoS, etc) to those in the “Closed Subscriber Group” Nasdaq: MSPD
  18. 18. An interference scenario UE Registered in HeNB is radiating at a power level that can be received by the Macro eNodeB This is received as noise by Macro eNodeB and makes it more difficult to listen to the UEs camping on it Depending on the interference level, Macro eNodeB would tell UEs to raise their power levels Nasdaq: MSPD
  19. 19. Key interference scenarios (3GPP) Aggressor Victim1 UE attached to Home eNode B Macro eNode B2 Home eNode B UE attached to Macro eNode B3 UE attached to Macro eNode B Home eNode B4 Macro eNode B UE attached to Home eNode B5 UE attached to Home eNode B Home eNode B6 Home eNode B UE attached to Home eNode B 1 Attached 6 BS Victim 4 UE Victim 2 5 3 Nasdaq: MSPD
  20. 20. System Modelling Femto houses , apartments and enterprise offices dropped within macro coverage area 10 m 10 m 10 m house 10 m Max femto BS area 10 m 2 apartment “stripes” with multiple floors Max UE area house Nasdaq: MSPD
  21. 21. Indoor Wireless Modelling Nasdaq: MSPD
  22. 22. Discovering the world around you UE measurements  LTE provides significant improvements (MDT) Continuous Network Monitor  UE receive chain regular scans for surrounding base stations Detection of Victim UEs  Continuous monitoring for UE transmission to other basestations Nasdaq: MSPD
  23. 23. Victim UE Detection (BEFORE) Transmit Power Neighbour macrocellS I Femto UE Femto AP “Victim” Macro UE Macro DeadzoneMacro DL SINR < threshold S I Nasdaq: MSPD
  24. 24. Victim UE Detection (SON!) Transmit Power Neighbour macrocellS I Femto UE Femto AP Uplink Transmissions “Victim” Macro UE Macro DeadzoneMacro DL SINR < threshold S I Nasdaq: MSPD
  25. 25. Victim UE Detection (AFTER) Transmit Power Neighbour macrocellS I Femto UE Femto AP “Victim” Macro UE Macro DeadzoneMacro DL SINR < threshold S I Nasdaq: MSPD
  26. 26. Summary SON is an essential component of any new network rollout Small cells are an essential component of any new network rollout High scalability SON is a MUST! Nasdaq: MSPD
  27. 27. Understand Carriers Problems & Solutions Received signal strength for Bath Macro + metro 600 20 650 0 500 -20 450metres dBm -40 400 350 -60 300 -80 250 -100 200 150 200 250 300 350 400 metres HetNet Coverage and Capacity ScenarioHandover/SHO and Hierarchical Cell Behaviour Carriers will talk if you are sharing interesting information Nasdaq: MSPD
  28. 28. The “Espresso GUIDE” to SON Mindspeed Technologies Mobile World Congress 2012 Nasdaq: MSPD