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Inter-Cell Interference Coordination (ICIC)     Status, performance impact and automation                Ljupco Jorguseski...
Outline     TNO Intro     ICIC introduction and status     ICIC performance impact     Can ICIC be automated via SON?     ...
TNO Introduction – LTE Trial3         "Self Organising Networks", 18-19 October 2011, London, UK   18/04/2012
ICIC Introduction       S              I                             Inter-cell interference problems                     ...
ICIC Status    P        Reuse 3                 Soft Reuse                       Static ICIC                              ...
ICIC Status Continued (Rel.10 onwards)    Macro                                                          HetNets deploymen...
ICIC Performance Impact – Background    CDF          Soft Reuse           Reuse1                  Reuse 3                 ...
ICIC Performance Impact – DL Comparison                                                                              Reuse...
ICIC Performance Impact – Soft re-use                                                                                     ...
ICIC Performance Impact – Dynamic Uplink                                                                                  ...
eICIC Performance Impact – HetNets      Macro                                                                eICIC in HetN...
Can ICIC be automated via SON?      Static ICIC controlling parameters: Δ, Bedge, Gth         SON based adaptive control o...
Summary and recommendations      ICIC can control the average vs cell-edge user throughput at low to      moderate load   ...
Questions14         "Self Organising Networks", 18-19 October 2011, London, UK   18/04/2012
Contact Details     Ljupco Jorguseski       ljupco.jorguseski@tno.nl       +31 15 2867154     Remco Litjens      remco.lit...
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Inter-Cell Interference Coordination (ICIC)

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Presented by Ljupco Jorguseski in "Self Organising Networks", 18-19 October 2011, London, UK

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Transcript of "Inter-Cell Interference Coordination (ICIC)"

  1. 1. Inter-Cell Interference Coordination (ICIC) Status, performance impact and automation Ljupco Jorguseski Remco Litjens, Job Oostveen, Haibin Zhang
  2. 2. Outline TNO Intro ICIC introduction and status ICIC performance impact Can ICIC be automated via SON? Summary and recommendations2 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  3. 3. TNO Introduction – LTE Trial3 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  4. 4. ICIC Introduction S I Inter-cell interference problems DL interference (at cell edge) UL interference (from neighbour cell edge) Inter-Cell Interference Coord. (ICIC) I Avoid using same PRBs i.e. S interference avoidance Use same PRBs but minimize interference4 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  5. 5. ICIC Status P Reuse 3 Soft Reuse Static ICIC E.g. reuse 3, soft reuse C1 C1 Possibility: adding SON to make it adaptive C2 C2 C3 C3 F Source: RNTP, HII Victim: OI Dyn. ICIC via X2 messages (R8/R9) 10101 H,M, L RNTP (pro-active) downlink HII (pro-active) uplink X2 OI (reactive) uplink5 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  6. 6. ICIC Status Continued (Rel.10 onwards) Macro HetNets deployment Macro cell overlay with Pico cell Pico serving hot-spots ‘Cell-edge’ also arround the pico- X2 cell coverage area Time domain eICIC for HetNets ‘Blank subframes’ report over X2 M M Flexible usage of frames between Macro and Pico cells (adaptive to P P P P load variations) T6 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  7. 7. ICIC Performance Impact – Background CDF Soft Reuse Reuse1 Reuse 3 Edge Δ Δ non-Edge Bedge -10 0 10 20 SINR [dB] Cedge =(Bedge/Nedge)log2(1 + SINR) Gth NEdge Nnon-Edge7 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  8. 8. ICIC Performance Impact – DL Comparison Reuse 3 worst performance due to 1/3 bandwidth usage Maximum C/I scheduling best average user throughput but unfair Reuse 1 with PF scheduling or soft re-use should be used: Reasonable average user throughput performance and fairness Source: L. Jorguseski, et.al. “Downlink Resource Allocation for Evolved UTRAN and WiMAX Cellular Systems”, IEEE PIMRC’088 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  9. 9. ICIC Performance Impact – Soft re-use Gth NEdge Nnon-Edge Gth controls NEdge and Nnon-Edge and therefore impacts average and cell edge throughput Gth should adapt to the traffic spatial distribution Source: L. Jorguseski, “QoS aware downlink radio resource management in future wireless access systems”, PhD Thesis, November 2008.9 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  10. 10. ICIC Performance Impact – Dynamic Uplink Gain at low to moderate load when usage of same PRB in neighbour cells can be avoided Gain diminishes at high load because: Unavoidable to use the same PRBs at neighbour cells Due to ICIC cell-edge users increase while cell-centre users decrease throughput resulting in zero throughput increase as netto Source: A. Racz, et.al., “On the impact of Inter-Cell Interference in LTE”, GLOBECOM 2008 effect10 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  11. 11. eICIC Performance Impact – HetNets Macro eICIC in HetNets deployment Enables re-use of same spectrum Pico at macro and pico Performance strongly influenced by X2 traffic spatial distribution and pico cell locations eICIC performance in HetNets deployment literature: 1. “Towards the Future Mobile Broadband with LTE Small Cells”, NEC Europe, LTE World Summit, 17 th-18th May, 2011, Amsterdam, The Netherlands 2. “Improving LTE Network Efficiency with Small Cell Architectures in Heterogeneous Networks”, Telefonica, 17 th- 18th May, 2011, Amsterdam, The Netherlands 3. “LTE Advanced HetNet Webinar”, Qualcomm11 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  12. 12. Can ICIC be automated via SON? Static ICIC controlling parameters: Δ, Bedge, Gth SON based adaptive control of these parameters Feedback loop based on e.g. UL/DL (edge or centre) user throughput measurements; measured path-loss per user; operator policy about cell throughput vs average throughput vs edge throughput, etc. Automatically ‘on-hold’ when reasonably high load is reached Dynamic ICIC or eICIC already automated/adaptive?12 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  13. 13. Summary and recommendations ICIC can control the average vs cell-edge user throughput at low to moderate load ICIC is not capacity enhancement as its gains diminish with high load Alternatives: CoMP (DL), MU-MIMO (UL), interference cancellation (DL/UL) Adaptive soft re-use ICIC (if appropriate feedback can be provided) or dynamic ICIC should be used In future HetNet deployment eICIC should be used13 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  14. 14. Questions14 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012
  15. 15. Contact Details Ljupco Jorguseski ljupco.jorguseski@tno.nl +31 15 2867154 Remco Litjens remco.litjens@tno.nl +31 15 2857184 Job Oostveen job.oostveen@tno.nl +31 8886 67214 Haibin Zhang haibin.zhang@tno.nl +31 6537 4349115 "Self Organising Networks", 18-19 October 2011, London, UK 18/04/2012

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