RAR Series Overview
A typical RAR configuration consists of one donor unit (DU) and one service unit (SU), interconnected via cable. The DU relays transmissions to/from the gNB, whereas the SU relays transmissions to/from UEs. Novel high-gain antennas based on dielectric rods can be optionally used at the DU and SU to communicate in a directional fashion. RAR can be customized for any 5G New Radio (NR) mmWave bands, as defined by the 3GPP specs, including the n261 (27.5 – 28.35 GHz), n259 (27 – 29.5 GHz), n258 (24.25 – 27.5 GHz), and n261 (37-40 GHz) bands. Incoming gNB/UE signals are dynamically amplified, providing for 90 dB maximum electronic gain the combined DU/SU system. The repeater exhibits a very low noise figure (NF) of ~ 3 dB. Being waveform agnostic, RAR can support all modulation and coding schemes (MCSs) transmitted by the gNB and UE. The DU and SU integrate two Tx/Rx chains with high isolation. Their antennas are dual polarized with more than 90 dB isolation between the vertical (V) and horizontal (H) polarizations. The latency for the RAR’s amplify-and-forward operation is in the order of nanoseconds. To comply with 5G NR protocols, RAR supports dynamic tracking of TDD cycles, without the need for explicit gNB control messages. This is done through integrated power sensors at the receive ports of the DU and SU. RAR can be mounted on light poles, traffic lights, and rooftops.