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In many countries more than 70 % of the traffic on cellular networks originates or terminates inside buildings. Driven by an increasing demand for mobile data services, the iPhone effect, this number is expected to rise even higher within the next years. When rolling out new systems addressing high speed data needs, e.g. LTE or HSPA+, a cost effective solution is explored by extending the outdoor macro coverage to in-side. In order to reduce the building penetration path loss, a relay can be used in an Amplify and Forward (AF) or Decode and Forward (DF) operation for improving the signal quality. The benefits of a DF relay on the achievable LTE downlink indoor coverage extension has been demonstrated.
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