The Potential of Restricted PHY Cooperation for the Downlink of LTE-Advanced
The authors investigate the potential of restricted PHY cooperation for the downlink of 4G networks. The cooperation is restricted to a cluster of eNodeBs. They distinguish between low and high mobility users, and propose two appropriate cooperation methods. The goal is to guarantee high user rates even on cell edges. They present a simulation study to analyze the spectral efficiency achieved by cooperation methods for urban micro cells. To investigate their influence on Coordinated MultiPoint (CoMP), they consider different frequency allocation strategies and different sector orientations in a cell. In addition, they compare CoMP transmission to Multiuser MIMO and investigate how cooperation can improve power allocation. Based on the results, they provide important insights into future cell planning aspects.