Patent ID: 11967991
Assignee: ADRF KOREA, INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A distributed antenna system (DAS) for multi-carrier and multi-frequency band based on an O-RAN standard in an open radio access network (O-RAN)-based mobile communication network, the DAS comprising:
an O-RAN remote unit (RU) connected to a fronthaul network according to an O-RAN split option specification of base station transceiver systems (BTSs), and comprising a plurality of O-RAN RUs to accommodate a plurality of carriers and a plurality of frequency bands;
a POI interface for connection by an analog RF signal and connected to one or more of the BTSs;
a digital common public radio interface (CPRI)/open base station initiative (OBSAI) interface connected to one or more of the BTSs;
an analog channel combiner configured to combine analog RF signals output from the POI interface and one or more of the plurality of O-RAN RUs; and
a digital channel combiner configured to combine baseband I/Q signals output from the CPRI/OBSAI interface and one or more of the plurality of O-RAN RUs,
wherein
the DAS further comprising:
an optical distribution unit (ODU) connected to the analog channel combiner; and
a radio unit (RU) connected to the ODU, and
wherein the RU comprises:
an optical receiving unit (ORU) configured to receive an optical signal from the ODU and convert the optical signal into an electrical RF signal;
a high power amplifier (HPA) configured to process the electrical RF signal;
a low noise amplifier (LNA) configured to process the electrical RF signal; and
a duplexer or filter configured to transmit an output of the HPA and an output of the LNA as radio waves.