for semi-persistent and aperiodic cases is not done for a specific SRS, rather for an SRS resource set which may include multiple SRSs [14]. A UE can be configured with one or several SRS resource sets, where each resource set includes one or more configured SRSs. All SRS occasions included within a configured SRS resource set are of the same type. In other words, periodic, semi-persistent, or aperiodic trans- mission is a property of an SRS resource set. A UE can be configured with multiple SRS resource sets that can be used for different purposes, including both downlink and uplink multi-antenna precoding and/or downlink and uplink beam management. The transmission of the set of configured SRS included in an aperiodic SRS resource set is triggered by a DCI. More specifically, DCI format 0_1 containing uplink grant and DCI format 1_1 containing downlink scheduling assignment include a 2-bit SRS-request that can trigger the transmission of one of the three different aperiodic SRS resource sets configured for the UE and the fourth bit combination corresponds to no trigger. The SRS antenna ports are typically not mapped directly to the UE's physical antennas, rather via some antenna mapping scheme. In order to provide connectivity regardless of the rotational direction of the device, the NR devices supporting high-frequency operation will New Radio Access Physical Layer Aspects (Part 2) 605 typically include multiple antenna panels pointing in different directions. The SRS may be mapped to one of those panels and transmission from different panels will then correspond to different antenna mapping schemes. The antenna mapping scheme has a real impact despite the fact that it is transparent to the gNB receiver; thus it is seen as an integral part of the overall channel from the UE to the gNB. The gNB may estimate the channel based on SRS transmission from a UE and subsequently select a precoding matrix that the device should use for uplink transmission. The device is then assumed to use that precoding matrix in combi