A so called DRS occasion may be understood herein as the time period wherein DRS are transmitted, e.g., from a cell. The discovery signals or Discovery Reference Signal (DRS) in a DRS occasion may be comprised of the Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), the CRS and when configured, the Channel State Information Reference Signals (CSI-RS). The PSS and SSS may be used for coarse synchronization, when needed, and for cell identification. The CRS may be used for fine time and frequency estimation and tracking and may also be used for cell validation, i.e., to confirm the cell IDentity (ID) detected from the PSS and SSS. The CSI-RS is another signal that may be used in dense deployments for cell or transmission point identification. FIG. 5 shows the presence of these signals in a DRS occasion of length equal to two subframes and also shows the transmission of the signals over two different cells or Transmission Points (TP).

FIG. 5 is a schematic diagram of the OFDM subcarriers and symbols in two subframes, wherein the dotted RE with light background represent SSS, the dotted RE with black background represent PSS, the striped RE represent CRS, the black RE represent empty RE, and the checkered RE represent CSI-RS. The two subframes are separated by a bold vertical bar.