gh macro interference. While almost blank subframes (ABS) con- taining no scheduling from the macro cell are giving the opportunity to the pico users to enhance their downlink transmission, the CRS, which are always transmitted, are creating interference in subframes which otherwise should have been completely silent. Release 11 UEs are able to cancel such CRS interference in HetNet scenarios. Such CRS IC operation is extended during Release 13 by defining performance requirements [1] for using the advanced receiver at the UE to cancel the CRS interference in the homogenous deployment with multiple interference sources. Indeed, in low-load networks, the CRS transmission becomes a non-negligible source of interference. We need to highlight though that the CRS IC is limited to two antenna ports, hence the issue of four4 CRS AP IC needs to be tackled further by the advanced UEs. Another new receiver study started in Release 13 is the NOMA [6], which looks at multi- plexing far and near eNodeB users on the same downlink time/frequency resources in such a way that the far user is sent with larger power level and near users with lower power level while the UE receiving the lower power level signal would subtract the high power signal first before detecting its own transmission. This operation principle is illustrated in Figure 11.16, with the sub-carriers of two users overlapping in the frequency (and spatial domain), trusting on the advanced receiver capability of user 2 which needs to cancel high power user 1. 3GPP has started work on Release 13 to include further performance requirements related to the interference reduction for control channels, as has been proposed in [2]. The proposed approach aims to have the UE receiver to cancel also interference experienced by the downlink control channels, thus improving the downlink physical layer signaling performance in difficult to interference conditions. 11.8 Conclusions In the previous sections, we have covered the Release 12 NAICS as well as the 3D- channel modelling