Method of communication with relay nodes and/or user equipment's and communication systems thereof

A base station (BS) to communicate with at least one of one or more user equipment's (UEs) and one or more relay nodes, said BS comprising:

• a base band processing unit;
• at least one central unit;
• at least one distributed unit;
• and
• at least one cylindrical antenna structure comprising a plurality of antenna panels, each of the plurality of antenna array columns comprises a plurality of antenna elements;
• wherein each the plurality of antenna array columns is configured to:
• transmit one or more downlink (DL) channel state information reference signals (CSI-RS) to at least one of the one or more UEs and one or more relay nodes;
• receive at least one of a DL channel state information (CSI) and one or more sounding reference signals (SRS) from the at least one of the one or more UEs and one or more relay nodes;
• and
• perform at least one of a SU-MIMO, MU-MIMO, time division duplexing (TDD), frequency division duplexing (FDD), and code domain multiplexing of one or more UEs or relay nodes.

A base station (BS) to communicate with at least one of one or more user equipment's (UEs) and one or more relay nodes, said BS comprising:

• a base band processing unit;
• at least one central unit;
• at least one distributed unit;
• and
• a structural MIMO (s-MIMO) arrangement comprising a plurality of antenna panels configured in both horizontal and vertical directions, each of the plurality of antenna panels comprises a plurality of antenna elements;
• wherein each the plurality of antenna panels is configured to:
• transmit one or more downlink (DL) channel state information reference signals (CSI-RS) to at least one of the one or more UEs and one or more relay nodes;
• receive at least one of a DL channel state information (CSI) and one or more sounding reference signals (SRS) from the at least one of the one or more UEs and one or more relay nodes;
• and
• perform at least one of a SU-MIMO, MU-MIMO, time division duplexing (TDD), frequency division duplexing (FDD), and code domain multiplexing of one or more UEs or relay nodes based on the received at least one of a DL CSI and one or more SRSs.