Interferece Management in LTE Femtocell

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My slides presentation when I got bachelor degree, Telecommunication Engineering. That is about Femtocell and Interference Management

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  • excellent presentation i'm doing a project on femtocell network ,how can i get the MATLAB tool ,can you please send this tool to amir.dhaoui@supcom.tn
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  • excellent presentation can i get the matlab coding .siva.kumar77707@gmail.com
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  • good presentation...I am doing thesis on femtocell interference management in LTE. can i get the matlab code? it will be helpful.....thank you :) my mail id is: tammineedimahesh@gmail.com
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  • excellent presentation can i get the matlab coding
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  • good presentation. Can I get the Matlab coding...
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Interferece Management in LTE Femtocell

  1. 1. Simulation and Analysis Interference Management Algorithm in LTE Femtocell Toha Ardi Nugraha 1110980271st Advisor : Nachwan Mufti A, ST.,MT 2nd Advisor : Hazim Ahmadi, ST.,MT
  2. 2. Contents – Preliminarily • Background • Objectives • Problems • Limitations – Basic Theory – Scenario and Simulation – Analysis
  3. 3. Background Over Capacity In Building Pico Cell BS indoor (DAS) downlink Repeater (DAS) Cell Edge New Solution Added Services
  4. 4. Femtocell ? Plug and Play Broadband cable Does not use network planning Self organizing Network (SON) Access Control (CSG), etc Network License (UMTS, CDMA)
  5. 5. ObjectivesInterference characteristic femtoSub-carrier frequency allocationFractional Frequency Reuse (FFR)Scenario and model
  6. 6. ProblemsScenarioConfiguration, parameter (macro – femto)Interference management algorithmSimulations and analysis
  7. 7. LimitationsLTE , downlink and co-channel interference,macro-femto, and femto-femto2600 MHz, urban area, and bandwidth 10 MHzUsing SISO and Omni directional antenna.Not discussing about power control andhandover schema.
  8. 8. Contents – Preliminarily – Basic Theory • LTE Femtocell • Access Control • Inter-Cell Interference • Fractional Frequency Reuse – Scenario and Simulation – Analysis
  9. 9. LTE Femtocell Architecture [3GPP TS.22.220]HeNB : Home eNode B (LTE femto)HeNB GW : HeNB GatewayHSS : Home Subscriber Server
  10. 10. LTE Architecture [3GPP TS 36.300] eNB : evolved Node B MME : Mobility Management Entity S-GG : Serving Gateway
  11. 11. Access Control Close Access Open Access Hybrid Access Status Close Open Hybrid Preferential Subscriber Access Access Access Non- No Access Access Limited Access Subscriber
  12. 12. Femtocell Problem #1: Inter-Cell Interference Downlink Interference Co-Channel Interference
  13. 13. Femtocell Problem : Co Channel Interference• Co-Channel Interference: caused by the use of the same frequencyFormula :• Signal to Interference Noise Ratio (SINR)• Data Rate
  14. 14. Model PropagationFormula :• Outdoor (SUI) c• Indoor   a  bhb  hb  f  PLf  6 log10    2000  Lwalls = 7 dB, 10 dB, 15 dB  h   10,8 log10   ; typeA dan B  2 PLh    h  20 log10   ; typeC   2
  15. 15. Contents – Preliminarily – Basic Theory – Scenario and Simulation • Cell Edge • Close Access • Open Access – Analysis
  16. 16. StartProcedure Scenario Simulation Parameters (eNB and HeNB) LTE Algoritma Management Interference (FFR) Simulation Scenarios with Access Control Method (Cell Edge) Open Access Close Access Simulation and Collect Data Signal to Interference Noise Data Rate Ratio (SINR) Scenario is over? Finish
  17. 17. Parameter Simulation Simulation Software : - Matlab , for SINR, data rate - Planet Mentum, for SINR, Data Rate, and coverage visualization Value Parameter macro femto Cell 19 Macro(eNB) 20-160 in eNB1 Transmit power FFR : 15 : 22 W 20mW Bandwidth 10 MHz Sub-carrier 600 Sub-carrier spacing 15 KHz Size of cell, and Center Zone 1 km, 63% Pathloss SUI (Outdoor), Indoor Propagation
  18. 18. Fractional Frequency Reuse (FFR)FFR (Fractional Frequency Reuse) is one effective solution of inter-cell interference control.FFR can control the interference in cell edges to enhance the frequency reuse factor and performance in the cell edges. System Layout Model
  19. 19. Scenario FFRm-fr FFRm-f (FFR macro only) Sub-Carrier Identification Macro Femto Center A 50 % 40% 60% Sector 1 B (50/3 )% (60/3) % (40/3)% Random Sector 2 C (50/3 )% (60/3) % (40/3)% Random Sector 3 D (50/3 )% (60/3) % (40/3)% Random Cell Center Cell Center Cell CenterPower Cell 1 Power Cell 1 Power Cell 1 Frequency Frequency Frequency Cell Edge Cell Edge Cell Edge Total System Total System Total System BW BW BW Ex : 50%, cell center 300 subcarrier, Bandwidth : 10 MHz = 600 sub-carrier cell edge @100 sub-carrier
  20. 20. Scenario FFRm-f eNB1 FFRm-f (FFR macro and femto) Sub-carrier No Location in cell Sector 1 Sector 2 Sector 3 Center (Omni) C1 (A) C2(A) C3 (A) 1 Macro Edge E1 (B) E2 (C) E3 (D) Center C1 (C,D) C2(B,D) C3 (B,C) 2 Femto Edge E1 (A,C,D) E2 (A,B.D) E3 (A,B,C)Example : SINR UE macro (eNB1, sector E1)
  21. 21. Cell Edge (Femto Close Access) User can not access femto Weak signal from macro Strong interference from femto
  22. 22. Cell Edge (Femto Open Access) User can access femto and macro Weak interference from macro
  23. 23. Contents – Preliminarily – Basic Theory – Scenario and Simulation – Analysis • SINR • Data Rate • Simulator
  24. 24. Signal to Interference Noise Ratio (SINR) Comparison SINR with distance (dB) Distancefrom macro FFR FFRm-fr FFRm-f (m) 300-400 23,37 23,37 23,37 8x 16,23 16,23 16,23 400-500 2,16 2,16 2,16 500-600 4,10 15,64 26,61 600-700 2.57 13,25 24,22 700-800 1.70 13,25 24,,22 800-900 0.64 12,19 23,16900-1000 Cell Center Cell edge SINR increased 8x ≈ 22 dB
  25. 25. SINR (open access) SINR Increased average 0,0002 dB @20 femto
  26. 26. Data Rate (Open Access) comparison data rate macro + femto (edge) (Mbps) Femto FFRm40-f FFRm50- f FFRm60-f FFRm40-fr FFRm50-fr FFRm60-fr 20 9,890 8,241 6,595 5,445 4,537 3,630 40 11,429 9,524 7,619 5,917 4,930 3,944 .. .. .. .. .. .. . 160 13,089 10,097 8,725 6,350 5,291 4,233 Using FFRm-f, Data Rate increased 2x then FFRm-fr
  27. 27. SINR (close access) “Close Access” Decreased SINR System
  28. 28. Data Rate (Close Access) Data rate User Macro (Center+Edge) FFRm-f dan FFRm-fr (Kbps) Femto FFRm40-f FFRm50- f FFRm60-f FFRm40-fr FFRm50-fr FFRm60-fr 20 485,91 404,92 323,94 181,34 226,62 271,90 40 280,26 233,55 186,84 98,580 123,17 147,75 .. .. .. .. .. .. .. 160 80,293 66,911 53,528 26,549 33,127 39,705 “Close Access” Decreased Data Rate System
  29. 29. Data Rate Total (Open Access) Data rate Macro + Femto User (Center and Edge) (Mbps) Femto FFRm40-f FFRm50- f FFRm60-f FFRm40-fr FFRm50-fr FFRm60-fr 20 24,6551 26,693 26,275 20,206 22,989 23,312 40 26,190 27,975 27,301 20,678 23,382 23,626 .. .. .. .. .. .. .. 160 27,849 29,935 28,407 21,111 23,743 23,915 Up to ≈ 30 Mbps
  30. 30. Simulator : Mentum Planet 5.0 (LTE) Downlink C/(I+N) Downlink Average Data Rate
  31. 31. Simulation Result (Data Rate)• In Simulator, FFRm50-f is also the best scenario to increase data rate in network. Average data rate in macro (Mbps) femto FFRm40-f FFRm50- f FFRm40-f FFRm40-fr FFRm50-fr FFRm60-fr 20 5,688 8,088 8,047 5,713 7,124 7.094
  32. 32. Conclusions FFR (macro and femto) can increase SINR about 22 dB or 8x in macro cell edge. "close access" will cause a decrease in SINR and data rate of the macro network due to the CCI (Co-Channel Interference). (FFRm40-f method) Increase femto in macro cell edge and use the "open access ", then the data rate at the cell edge network also grew. FFRm40-f is effective method in cell edge and FFRm50-f (system) Simulations indicate that the addition femto using-f FFRm50-f scenario is also the most effective method
  33. 33. SuggestionsResearch about femto (OFDMA)Other Method (Power Control)Tools Simulation (femto simulator)
  34. 34. Thank Youalhamdulillah.com

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