. Some of the technologies covered in Chapter 3 are usable in macro cell layer as well, such as improvements in the M2M connectivity and related coverage improvements. 11.2 Network-Assisted Interference Cancellation Release 12 introduced in LTE more powerful receivers on the UE side, relying on non-linear processing and performing interference cancellation. Several forms of interference exist in an LTE system: inter-stream interference due to the non-orthogonality of spatial MIMO streams dedicated to the same UE (the so-called SU-MIMO interference) and inter-user interference which can arise between users spatially multiplexed in the same cell, for example, sharing the same time and frequency resources (the so-called MU-MIMO interference). Interference happens between UEs located in different cells, called inter-cell interference. UEs located at the cell edge are suffering in particular by the inter-cell interference. NAICS is a downlink Release 12 technology enhancing the PDSCH interference cancellation (IC)/interference suppression (IS) capability of the UEs by providing signalling support from the network side, as shown in Figure 11.1, with the network indicating the transmission parameters used by the interfering eNodeB(s). Hence, NAICS is targeting the cancellation of inter-cell interference from the previous-mentioned interference scenarios. NAICS aims to be applicable through the whole system, in conjunction with various network configurations and technologies. At first glance, it might look that NAICS is addressing the same interference mitigation problem as FeICIC and CoMP; however, the main goal is to have a versatile utilization of NAICS, complementing the operation of FeICIC and CoMP, if these technologies are already deployed. One of the main targets of this technology is that the NAICS UE is able to cancel the inter-cell PDSCH interference. In order to perform PDSCH cancellation, the NAICS UE (((c yo))) Serving eNodeB Interfering eNodeB TX parameters SECURITY UE with NAICS capability Figure 11.1 NAI