# US 2019/0174544 A1 · Wireless communication device, wireless communication terminal, and wireless communication method

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- Number: US 2019/0174544 A1
- Document ID: US20190174544A1
- Status: Published application
- Kind: A1
- Application number: 16/268,076
- Filed: 2019-02-05
- Published: 2019-06-06
- Earliest claimed: 2016-09-20
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Ryoko Matsuo; Tomoya Tandai; Toshihisa Nabetani
- Web page: https://patentgrep.com/patent/US20190174544A1

## CPC

- H04W 74/0816: with collision avoidance
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- 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 wireless communication device includes: controlling circuitry configured to set at least one of: a first transmission prohibition period for a first network to which the wireless communication device belongs; or a second transmission prohibition period for a second network, and to determine, when a first frame addressed to another device is received in a case that the first transmission prohibition period is not set and the second transmission prohibition period is set, a state of a wireless medium based on comparing a reception level of the first frame with a threshold defined corresponding to one of the first network and the second network, to which a sender of the first frame belongs.

## Claims

### Claim 1

A wireless communication device comprising:
controlling circuitry configured to set at least one of: a first transmission prohibition period for a first network to which the wireless communication device belongs; or a second transmission prohibition period for a second network, and
to determine, when a first frame addressed to any device other than the wireless communication device is received in a case that the first transmission prohibition period is not set and the second transmission prohibition period is set, a state of a wireless medium based on comparing a reception level of the first frame with a threshold defined corresponding to one of the first network and the second network, to which a sender of the first frame belongs;
a transmitter configured to transmit a second frame based on the state of the wireless medium; and
a receiver configured to receive a third frame addressed to any device other than the wireless communication device wherein:
the controlling circuitry is configured to set the second transmission prohibition period when a network to which a sender of the third frame belongs cannot be determined,
the receiver is configured to receive a fourth frame, a sender of which belongs to the second network and which is addressed to any device other than the wireless communication device, after the second transmission prohibition period is set on the basis of the third frame, and
the controlling circuitry is configured to determine that the wireless medium is busy when either a receiver address or a transmitter address of the third frame is not identical to a transmitter address or a receiver address of the fourth frame.