Download - Inter-Cell Interference Coordination in Heterogeneous Networks with Open Access of Small Cells
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
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
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
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
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 cell Small cell
Small cell Small cell
Poor Signal
Co-Channel Interference
(same frequency)
Small Cells
Small Cells
Small Cells
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
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
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
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
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)
Toha Ardi Nugraha - IT Convergence Engineering- KIT
Inter-Cell Interference Coordination in Heterogeneous Networks with Open
Access of Small Cells
Sim
ula
tio
n R
esu
lt
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
Thank You
Question?
감사합니다
Kumoh National Institute of Technology
Thesis Presentation