Main Challenges. For achieving the mentioned high performance gains we had to develop advanced clustering schemes that ensure user-centric cooperation for almost all users. At the same time, the inter- cluster interference had to be minimized. Reducing the overall interference floor in the system with respect to intra- as well as inter-cluster interference was another high level goal. The use of appropriate types of user grouping and scheduling proved to be very important and powerful tools. Another task was to find precoders with high performance, low complexity and at the same time robustness against imperfections. Finally, as discussed above, interference mitigation by its nature provides gains only in interference limited scenarios. We assume that the system is working under such conditions.
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Sources: Grant Agreement, Grant Agreement