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.

Text of Clustered Network MIMO and Fractional Frequency Reuse for the Downlink in LTE-A Systems

  • 1. Clustered Network MIMO and Fractional FrequencyReuse for the Downlink in LTE-A SystemsAjay Thampiy, Simon Armoury, Zhong Fanz, Dritan KaleshiyyCommunication Systems and Networks Research Group, University of Bristol, UKzToshiba Research Europe, Telecommunications Lab, Bristol, UKMay 16, 2014Ajay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 1 / 18

2. Thanks to...The U.K. Research Council and Toshiba for jointly funding my PhD underthe Dorothy Hodgkin Postgraduate Awards.Ajay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 2 / 18 3. The ProblemWorldwide data trac to grow 7-fold in the next 3 yearsI 66% of that trac will be videoOperators deploying 4G LTE NetworksI Reduced cell sizeI Aggressive frequency reuse (Reuse factor ! 1)Major Performance Bottleneck: Inter-Cell InterferenceAjay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 3 / 18 4. Possible SolutionsNetwork MIMO (aka CoMP)I Base stations pooled together to form a Virtual MIMO systemF Data and channel states are sharedI Interference channel becomes:F Broadcast channel on the downlinkF Multiple-access channel on the uplinkI Ideal solution if backhaul links have in 5. nite capacityI Realistically, global coordination is unscalableFractional Frequency Reuse (FFR)I Split the spectrum into two bands:F Band 1: Cell-Centre (Reuse factor = 1)F Band 2: Cell-Edge (Reuse factor1)I Cancels interference entirely but inecient use of spectrumAjay Thampi (University of Bristol) Clustered Network MIMO and FFR May 16, 2014 4 / 18 6. Clustered Network MIMO - System Model (1/2)Scalable Network MIMOC Clusters, each of size B (Here, C = 7 and B = 3)I Cluster 0: Home ClusterI Clusters 1 to C