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Coordinated Multipoint Transmission in Femtocell Systems

Coordinated Multipoint Transmission in Femtocell Systems. Masters Thesis Presentation Department of Communications and Networking Student: Utku Öztürk Supervisor: Prof. Jyri Hämäläinen Aalto University Instructor: M.Sc. Zhong Zheng Aalto University. Agenda. Thesis LTE Overview

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Coordinated Multipoint Transmission in Femtocell Systems

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  1. Coordinated Multipoint Transmission in Femtocell Systems Masters Thesis Presentation Department of Communications and Networking Student: Utku Öztürk Supervisor: Prof. Jyri Hämäläinen Aalto University Instructor: M.Sc. Zhong Zheng Aalto University

  2. Agenda • Thesis • LTE Overview • Coordinated Multipoint Transmission • Femtocell Concept • Simulation Model • Performance Evaluation

  3. Thesis • Literature Review • Simulator • Implementing the new functions • Performance tests • Verification of the results

  4. LTE Overview • 4G technology • Simplified Architecture • Reduced Costs • Low Power Consumption • Enhanced Data Rates • Mutliple Antenna Solutions • Increased Coverage

  5. Coordinated MultiPoint Transmission CoMP • Full frequency reuse (reuse one) is highly desirable for future communication systems so as to exploit the spectrum efficiently. • The effects of interference is crucial if carrier frequencies of cells are the same as in OFDMA systems. It limits the spectral efficieny mostly at cell edge. • The main purpose is to increase the SINR of the user. • Drawbacks: - Interference to other users • - Extra power consumption • - Additional cost

  6. CoMP Schemes in Downlink Coordinated Scheduling / Beamforming “Interference Mitigation Method” Joint Processing“Improve signal quality” Dynamic Cell Selection : Fast selection of cells Joint Transmission : Signal combining Joint Transmission : Signals from different BSs are coherently combined at the terminal Y1 = H11 W1 X1 + H21 W2 X2 + H31 W3 X3 + N1 Y1 = (H11 W1 + H21 W2 + H31 W3)*X + N1 CoMP X = X1 = X2 = X3

  7. Femtocell Concept • Features: • Low Power • Low Cost • Plug & Play • The need for femtocells: • Coverage • Capacity • Power • Ability to be connected to fixed telephony line

  8. Inter-cell interference in Femtocell Networks Cross-layer interference Macrocell Femtocell Femtocell Macrocell Co-layer intereference Femtocell Femtocell

  9. System Model Ref. 1. 3GPP TSG RAN WG4 (Radio) Meeting #51, 4-8 May 2009

  10. System Metrics and Parameters SINR threshold level : 0, 3, 5, 10, 15, 25 dB FBS penetration rate : 0.25, 0.50, 0.75, 1 CDF of throughput 50%-ile users 5%-ile users All 4 users The worst user

  11. Summary and Conclusions • Coordination of the base stations in a femtocell network improve the system performance in general terms • Interference severely degrades the performance of the bad performing users and the users having the worst throughput • Lower SINR threshold values perform better for users in poor condition • The increasing number of FBSs deployed in the femotcell network increases the overall system performance as well

  12. Thank you Questions ?

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