Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells

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The Institute of Electronics and Information Engineers (IEIE) Summer Conference 2014

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Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells

  1. 1. Toha Ardi Nugraha WENS Laboratory IT Convergence Engineering Kumoh National Institute of Technology Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Wireless and Emerging Networking Siystem Laboratory
  2. 2. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Contents •Introduction •Problem Formulation •Previous Works •System Model •Simulation Results •Conclusion
  3. 3. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Heterogeneous Networks • Hetnets : different base station types, (Macrocell/eNB) and low power (Small-cells or home base stations (HeNB) • Macrocell : a wide area, • low power Small-cells : hot-spots and indoor (to offload traffic from the Macro-layer) Solution to boost the network capacity and increase of data traffic
  4. 4. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Small Cells • Shift from voice-only to voice- & data-based traffic • Improved technologies – smart antennas and MIMO, • Dead zone Problem – Poor indoor coverage • Solution – Small Cells – (YouTube : http://goo.gl/en8Gc8) • What is small cells? improved cellular/indoor coverage, capacity and applications (ex : SON – Self Organizing Networks, plug and play) • Type of small cells? Femtocells, picocells, metrocells and microcells
  5. 5. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Problem Formulation • High density of small cells • Problems : Interference between small cells • Solution?? Interference management : frequency reuse and preceding technique (MMSE and BD) Small cellSmall cell Small cellSmall cell Poor Signal Co-Channel Interference (same frequency) Small Cells Small Cells Small Cells
  6. 6. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Access Method Closed Access Open Access
  7. 7. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Previous Works and Proposed Scheme Parameter Previous Works Proposed Multi Cell Non-Cooperative Cooperative Cooperative (Clustering) Scheme Frequency Reuse Precoding : MMSE Precoding : BD Power Allocation Fractional Equal Power Water Filling Bandwidth Allocation Frequency Reuse (Weakness) Full Bandwidth Full Bandwidth Interference Cancellation Inter cell interference Inter user interference Inter user interference System Model Precoding : Pre define symbol before transmitting
  8. 8. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Interference cancelation in cooperative heterogeneous Network with coordination strategy. Contribution • Coordination strategy in Heterogeneous Network, consider : – Extended Block Diagonalization scheme (Applied in Heterogeneous Networks ) – Water filling power Allocation – Open Acess Method Proposed Scheme
  9. 9. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Power Allocation more power (low noise) Equal Power Water filling same power allocate to each channel Difference power allocate to each channel Problem : high interference (power) Give the more power when the channel is good
  10. 10. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells System Model Parameter Value Number of small cells in cluster 2, 3, 4, 7 Number of neighbor cluster 1 Transmit Power of small cell 20 dBm/100 mW Precoding MMSE and BD Frequency Reuse Frequency Universal and Frequency Reuse Workload Performance • Number of Clustered Small Cells in Macrocells • Power allocation Sum rate capacity (data rate)
  11. 11. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells SimulationResult
  12. 12. Toha Ardi Nugraha - IT Convergence Engineering- KIT Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells Conclusions • Proposed Interference Coordination in Heterogeneous Networks • Power allocations : water filling > equal power allocation. • Precoding : BD > MMSE
  13. 13. Thank You Question? 감사합니다 Kumoh National Institute of Technology Thesis Presentation

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