In some embodiments, the data may be sent by the first communication device 101 to the second communication device 102 after the second period in a second set of time-frequency resources, e.g., a second one or more subframes in LTE.

The following is a description of different groups of examples of embodiments herein, which are illustrated taking DRS as an example of the discovery signal.

DRS with UL Grants

In a first group of examples, UL resource grants may be sent by the first communication device 101 in the subframe/s containing DRS within a DRS occasion. These grants may be used to indicate PUSCH allocations on an upcoming Transmission-Time Interval (TTI), for example 2 ms or 4 ms after the DRS subframe. Grants for multiple upcoming TTIs may be sent in the same subframe.

In another exemplary implementation, the UL grant/s sent with the DRS may be multi-subframe grants that may be valid for a specific range of multiple UL subframes, or that may be valid for a specific time window on the UL.

DRS with DL Grants

In a second group of examples, the resource grants sent by the first communication device 101 with the DRS may correspond to DL PDSCH grants for future subframes or upcoming burst of subframes.

DRS with Cross-Carrier or Joint Grants