US 10,649,077 B2Granted

Distributed antenna base station, mobile station, and method of distance measurement

AssigneeMitsubishi Electric Corporation

InventorKaoru Tsukamoto

Life of this patent

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Abstract

There are provided a signal transmitter that generates a signal indicating execution of distance measurement and transmits the signal to a plurality of antennas, a combiner that adds a plurality of received signals that are radio signals including a response signal from the mobile station and each of which is correspondingly received by each of the antennas, a timing detector that detects a timing at which reception power for a signal added by the combiner is maximized and determines a reception timing of the response signal, a base station time calculator that determines a round trip time from transmission of the signal indicating execution of distance measurement to reception of the response signal on the basis of the reception timing and a timing of the transmission of the signal indicating execution of distance measurement, a power detector that identifies one of the antennas that has received a received signal with highest reception power among the plurality of received signals, and a distance calculator that calculates a distance between the distributed antenna base station and the mobile station on the basis of the round trip time, a delay in signal transmission to the antenna identified by the power detector, and a distance to the identified antenna.

Claims10

Dependent claims

A distributed antenna base station, to which a plurality of distributed antennas installed along a traveling route of a mobile station is connected, that communicates with the mobile station in a communicable range formed by the plurality of antennas, the distributed antenna base station comprising:

first processing circuitry
to generate a signal indicating execution of distance measurement and transmit the signal to the plurality of antennas;
to add a plurality of received signals that are radio signals including a response signal to the signal indicating execution of distance measurement from the mobile station and each of which is correspondingly received by each of the antennas;
to detect a timing at which reception power for a signal added is maximized and determine a reception timing of the response signal;
to determine a round trip time from transmission of the signal indicating execution of distance measurement to reception of the response signal on the basis of the reception timing and a timing of the transmission of the signal indicating execution of distance measurement;
to identify one of the antennas that has received a received signal with largest reception power among the plurality of received signals;
and
to calculate a distance between the distributed antenna base station and the mobile station on the basis of the round trip time, a delay in signal transmission to the antenna identified, and a distance between the distributed antenna base station and the identified antenna.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/462,900Filed 27 Jan 2017
Published: US 2020/0072961 A15 Mar 2020
Granted: 12 May 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G01S 13/76
Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems: wherein pulse-type signals are transmitted
G01S 13/765
Wherein pulse-type signals are transmitted: with exchange of information between interrogator and responder
B61L 25/02
Recording or indicating positions or identities of vehicles or trains or setting of track apparatus: indicating or recording positions or…
H04W 64/00
Locating users or terminals or network equipment for network management purposes