US 11,716,145 B2
DAS for multi-frequency band and multi-carrier based on O-RAN standard
Chong Youn Chun, Seongnam-si (KR); and Chan Ki Cho, Icheon-si (KR)
Assigned to ADRF KOREA, Inc., Icheon-si (KR)
Filed by ADRF KOREA, Inc., Icheon-si (KR)
Filed on Nov. 17, 2021, as Appl. No. 17/528,461.
Claims priority of application No. 10-2021-0116402 (KR), filed on Sep. 1, 2021.
Prior Publication US 2023/0067773 A1, Mar. 2, 2023
Int. Cl. H04B 10/2575 (2013.01); H04B 7/0413 (2017.01)
CPC H04B 10/25759 (2013.01) [H04B 7/0413 (2013.01); H04B 10/25753 (2013.01)] 8 Claims
OG exemplary drawing
 
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; and
a channel combiner to which outputs of the plurality of O-RAN RUs are combined,
wherein the channel combiner is an analog combiner,
the DAS further comprising:
an ODU connected to the analog combiner; and
a millimeter wave RU connected to the ODU, and
wherein the millimeter wave RU comprises:
an ORU configured to receive an optical signal from the ODU;
an IF-RF converter configured to convert an output of the ORU into an intermediate frequency (IF) and then convert the IF into RF;
an RF-millimeter wave converter configured to receive the RF;
an array antenna interface connected to the RF-millimeter wave converter; and
an array antenna connected to the array antenna interface to perform broadband transmission.