# US 10,484,097 B2 · Communication repeater system and method

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- Number: US 10,484,097 B2
- Document ID: US10484097B2
- Status: Granted
- Kind: B2
- Application number: 15/991,337
- Filed: 2018-05-29
- Published: 2018-12-06
- Granted: 2019-11-19
- Earliest claimed: 2017-05-31
- Assignees: Kabushiki Kaisha Tashiba; Toshiba Infrastructure Systems & Solutions Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Infrastructure Systems & Solutions Corporation
- Inventors: Kensei Kawabata
- Web page: https://patentgrep.com/patent/US10484097B2

## CPC

- H04B 10/299: Signal waveform processing, e.g. reshaping or retiming
- H04B 7/2609: {Arrangements for range control, e.g. by using remote antennas}
- H04B 7/269: {Leader-follower synchronisation}
- H04B 10/272: Star-type networks {or tree-type networks}
- H04W 84/20: Leader-follower arrangements
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

According to one embodiment, a communication repeater system includes a master station device, slave station devices, radio frequency units that convert signals from base station systems into optical digital signals for transmission to the master station device. The base station systems establish communication by time-division duplex scheme. The communication repeater system repeats communication between a mobile communication terminal device and each base station system via a corresponding slave station device. At least one of the radio frequency units and the master and slave station devices includes a learning-signal input port, and a setter that generates a reference transmission/reception switching timing signal based on a learning signal input to the learning-signal input port and sets the generated signal as reference transmission/reception switching timing. The rest of the units and the devices each include a corrector that corrects variation in transmission/reception switching timing according to the reference transmission/reception switching timing.

## Claims

### Claim 1

A communication repeater system comprising:
a plurality of radio frequency units which correspond to base station systems and convert a radio signal from the corresponding base station systems into a digital signal and transmit the digital signal, the base station systems having mutually independent reference clocks for a transmission and reception switching timing at which transmission and reception of an uplink signal and a downlink signal are switched by time division,
a plurality of slave station devices, and
a master station device that receives the digital signal from the radio frequency units and establishes communication with a mobile communication terminal device via the slave station devices, the communication repeater system that repeats communication between the mobile communication terminal device and each of the base station systems via the slave station devices, wherein
at least one of the radio frequency units, the master station device, and the slave station devices includes:
a learning-signal input port, and
first processor configured to generate a reference transmission and reception switching timing signal based on a learning signal input to the learning-signal input port, and set the reference transmission and reception switching timing signal as a reference transmission and reception switching timing; and
the rest of the radio frequency units, the master station device, and the slave station devices each includes a second processor configured to correct a variation in the transmission and reception switching timing in accordance with the reference transmission and reception switching timing.

### Claim 2 (depends on 1)

The communication repeater system according to claim 1, wherein
the first processor transmits a timing signal corresponding to the reference transmission and reception switching timing to the second processor.

### Claim 3 (depends on 1)

The communication repeater system according to claim 1, wherein
each of the radio frequency units comprises the second processor, and
the master station device comprises the first processor.

### Claim 4 (depends on 3)

The communication repeater system according to claim 3, wherein
the second processor corrects the variation in the transmission and reception switching timing in consideration of a transmission delay amount between the master station device and each of the radio frequency units.

### Claim 5

A method to be executed by a communication repeater system that comprises a plurality of radio frequency units which correspond to base station systems and convert a radio signal from the corresponding base station systems into a digital signal and transmit the digital signal, the base station systems having mutually independent reference clocks for a transmission and reception switching timing at which transmission and reception of an uplink signal and a downlink signal are switched by time division, a plurality of slave station devices, and a master station device that receives the digital signal from the radio frequency units and establishes communication with a mobile communication terminal device via the slave station devices, the communication repeater system that repeats communication between the mobile communication terminal device and each of the base station systems via the slave station devices, wherein
at least one of the radio frequency units, the master station device, and the slave station devices includes a learning-signal input port, the method comprising:
generating a reference transmission and reception switching timing signal based on a learning signal input to the learning-signal input port and setting the reference transmission and reception switching timing signal as a reference transmission and reception switching timing; and
correcting a variation in the transmission and reception switching timing in accordance with the reference transmission and reception switching timing.