US 11,817,918 B2
Redundancy of distributed antenna systems
Ho Sik Jang, Seongnam-si (KR); Hoo Pyo Hong, Seongnam-si (KR); Hyong Ho Kim, Seoul (KR); Dong Hee Kwon, Yongin-si (KR); Kyung Eun Han, Suwon-si (KR); Jin Hwa Ku, Suwon-si (KR); Dae Young Kim, Seoul (KR); and Young Man Cho, Seoul (KR)
Assigned to Solid, Inc., Seongnam-si (KR)
Appl. No. 17/272,937
Filed by Solid, Inc., Seongnam-si (KR)
PCT Filed Jul. 25, 2019, PCT No. PCT/KR2019/009261
§ 371(c)(1), (2) Date Mar. 3, 2021,
PCT Pub. No. WO2020/045828, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 10-2018-0102988 (KR), filed on Aug. 30, 2018.
Prior Publication US 2022/0352929 A1, Nov. 3, 2022
Int. Cl. H04B 7/022 (2017.01); H04B 17/11 (2015.01); H04B 17/15 (2015.01); H04B 17/29 (2015.01); H04B 7/26 (2006.01); H04Q 3/00 (2006.01)
CPC H04B 7/022 (2013.01) [H04B 7/2609 (2013.01); H04B 17/11 (2015.01); H04B 17/15 (2015.01); H04B 17/29 (2015.01); H04Q 3/0075 (2013.01); H04Q 3/0087 (2013.01); H04Q 2213/13098 (2013.01); H04Q 2213/145 (2013.01); H04Q 2213/167 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A distributed antenna system connected to a first base station and a second base station, which provide a duplication-based service, and configured to support high availability, the distributed antenna system comprising:
a first headend unit configured to receive a mobile communication signal from the first base station, generate and transmit a downlink frame, and configure and manage topology information of the distributed antenna system;
a second headend unit configured to receive a mobile communication signal from the second base station, generate and transmit a downlink frame, and configure and manage topology information of the distributed antenna system; and
a first branch group and a second branch group each comprising a hub unit branched from and connected to the first headend unit and the second headend unit and configured to distribute a downlink received from the first headend unit or the second headend unit to a sub-node connected to a downlink port and a plurality of remote units connected to the hub unit as a sub-node and configured to restore a mobile communication signal from the distributed downlink frame and transmit the mobile communication signal in a wireless manner,
wherein
one of the first headend unit or the second headend unit is in an active state, the other headend unit is in a standby state, and each headend unit adds a state bit indicating a duplication state to a control field of the downlink frame and then transmits the downlink frame, and
the hub unit of the first branch group or the second branch group that has received the downlink frame delivers only a frame received from an active headend unit to the sub-node connected to the downlink port.