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Clustered Network MIMO and Fractional Frequency 
Reuse for the Downlink in LTE-A Systems 
Ajay Thampiy, Simon Armoury, Zho...
Thanks to... 
The U.K. Research Council and Toshiba for jointly funding my PhD under 
the Dorothy Hodgkin Postgraduate Awa...
The Problem 
Worldwide data trac to grow 7-fold in the next 3 years 
I 66% of that trac will be video 
Operators deploying...
Possible Solutions 
Network MIMO (aka CoMP) 
I Base stations pooled together to form a Virtual MIMO system 
F Data and cha...
nite capacity 
I Realistically, global coordination is unscalable 
Fractional Frequency Reuse (FFR) 
I Split the spectrum ...
Clustered Network MIMO - System Model (1/2) 
Scalable Network MIMO 
C Clusters, each of size B (Here, C = 7 and B = 3) 
I ...
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems
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Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems

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My presentation at the European Wireless conference held in Barcelona, Spain on 16-May-2014.

Published in: Engineering
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Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems

  1. 1. Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems Ajay Thampiy, Simon Armoury, Zhong Fanz, Dritan Kaleshiy yCommunication Systems and Networks Research Group, University of Bristol, UK zToshiba Research Europe, Telecommunications Lab, Bristol, UK May 16, 2014 Ajay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 1 / 18
  2. 2. Thanks to... The U.K. Research Council and Toshiba for jointly funding my PhD under the Dorothy Hodgkin Postgraduate Awards. Ajay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 2 / 18
  3. 3. The Problem Worldwide data trac to grow 7-fold in the next 3 years I 66% of that trac will be video Operators deploying 4G LTE Networks I Reduced cell size I Aggressive frequency reuse (Reuse factor ! 1) Major Performance Bottleneck: Inter-Cell Interference Ajay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 3 / 18
  4. 4. Possible Solutions Network MIMO (aka CoMP) I Base stations pooled together to form a Virtual MIMO system F Data and channel states are shared I Interference channel becomes: F Broadcast channel on the downlink F Multiple-access channel on the uplink I Ideal solution if backhaul links have in
  5. 5. nite capacity I Realistically, global coordination is unscalable Fractional Frequency Reuse (FFR) I Split the spectrum into two bands: F Band 1: Cell-Centre (Reuse factor = 1) F Band 2: Cell-Edge (Reuse factor 1) I Cancels interference entirely but inecient use of spectrum Ajay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 4 / 18
  6. 6. Clustered Network MIMO - System Model (1/2) Scalable Network MIMO C Clusters, each of size B (Here, C = 7 and B = 3) I Cluster 0: Home Cluster I Clusters 1 to C

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