US 12,250,034 B2
Distributed antenna system, wireless communication method, and centralized station
Hayato Fukuzono, Musashino (JP); Keita Kuriyama, Musashino (JP); Masafumi Yoshioka, Musashino (JP); and Toshifumi Miyagi, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 18/271,253
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jan. 7, 2021, PCT No. PCT/JP2021/000384
§ 371(c)(1), (2) Date Jul. 7, 2023,
PCT Pub. No. WO2022/149244, PCT Pub. Date Jul. 14, 2022.
Prior Publication US 2024/0063850 A1, Feb. 22, 2024
Int. Cl. H04B 7/0452 (2017.01); H04B 7/024 (2017.01)
CPC H04B 7/0452 (2013.01) [H04B 7/024 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A distributed antenna system, comprising:
a plurality of base stations to perform multiple-input-multiple-output (MIMO) [MIMO] transmission to user terminals at an identical frequency; and
an aggregation station to aggregate pieces of information used by the respective base stations, wherein the aggregation station includes:
a receiver to receive, from each of the base stations, communication path information with each of accommodated user terminals, for each user terminal;
determination circuitry configured to determine, on a basis of the communication path information for each user terminal received by the receiver, whether or not a plurality of the base stations and a plurality of user terminals are arranged on a straight line;
calculation circuitry configured to calculate, in a case where the determination circuitry determines that the plurality of the base stations and the plurality of user terminals are arranged on the straight line, transmission weights of respective transmission beams transmitted by the plurality of the respective base stations to the plurality of respective user terminals on the basis of the communication path information for each user terminal received by the receiver, wherein the transmission beams are shifted by a half wavelength or more for the respective user terminals; and
control circuitry configured to control such that the base stations transmit the respective transmission beams, on a basis of the respective transmission weights calculated by the calculation circuitry.