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Deutsche Telekom and Samsung improve cell-edge experience

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Deutsche Telekom says that it has successfully deployed Inter Sector MIMO (IS MIMO) to improve performance at the cell edge area and improve the overall LTE A customer experience by up to 50 percent.

Inter-Sector MIMO is a new technology concept jointly developed by DT and Samsung to solve the challenge of limited throughput at the cell edge.

How IS-MIMO works

In conventional LTE networks, the maximum reachable LTE user experience (150Mbps) is only achievable close to the antenna where the signal is strongest. As the customer moves further away from the antenna the signal gradually weakens, until the customer eventually experiences an extremely limited throughput in the area between two intra-site sectors. This is caused by inter-cell interference in LTE.

With IS-MIMO, all intra-site cells combine to create one cell and the data signal is transmitted to the user terminal from the best source. No terminal assistance is required, irrespective of whether the signal is transmitted from a single or two separated intra-site eNodeB antennas. As well as bringing peak performance to the cell edge area, the trial demonstrated that the IS-MIMO concept improves the overall LTE customer experience by up to 50 percent. In the Lingen field trial, Deutsche Telekom was able to demonstrate that the IS-MIMO combination extends the area where LTE-A customers can reach the maximum throughput of 150 Mbps. Furthermore, the trial was able to measure a maximum throughput at the cell edge area. This shows the capability of IS-MIMO to effectively remove the cell edge area between two intra-site sectors via cell combining and MIMO streams transmission from adjacent sectors.

IS-MIMO and Carrier Aggregation make a good team

DT and Samsung also successfully demonstrated a combination of carrier aggregation and IS-MIMO. With IS-MIMO on one or more carriers, more consistent customer experience over a given coverage can be achieved. This concept was jointly developed in the framework of a DTAG/Samsung Innovation Cooperation project which was launched in 2013.

Good to know

Carrier Aggregation (CA) is an important technology in the LTE standard for bundling two and more carriers to provide higher peak rates rather than additional capacity. Multiple Input Multiple Output (MIMO) is another technology in the LTE standard to improve network performance in terms of coverage, spectral efficiency and throughput.

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Tags: deutsche telekom  samsung  lte-a  mimo  Germany