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Relaying is a promising enhancement to current radio access networks. Relayenhanced LTE-Advanced networks are expected to fulfill the demanding coverageand capacity requirements in a cost-efficient way. However, due to low transmitpower, the coverage areas of the relay nodes will be small. Therefore, theperformance of relay deployments may be limited by load imbalances. In thisstudy, we present a practical solution for this problem by introducing a biasto cell selection and handover decisions along with a reduction in eNB transmitpower. This method results in an extension of the relay cells and anappropriate load balance can then be achieved. Moreover, it is shown that aproper power control setting is necessary in the uplink and that power controloptimization can further enhance the system performance. Comprehensive systemlevel simulations confirm that the proposed solution yields significant userthroughput gains both in the uplink and the downlink.

Enhancing LTE-Advanced Relay Deployments via Relay Cell Extension