A method includes: determining, by an access point based on remaining quantities of electricity and/or location information of all stations in at least one station group in a basic service set, an identifier of a type-1 station in each of the at least one station group and available time window information that corresponds to each type-1 station, and generating a notification message including relay enabling information of the at least one station group, relay enabling information of each station group includes identifiers of at least two type-1 stations in the station group and the available time window information of each type-1 station; and broadcasting, by the access point, the notification message in the basic service set.

Technology for a repeater is disclosed. The repeater can include a signal path configured to carry a signal having a selected radio frequency (RF) bandwidth on an RF carrier at a selected frequency. The signal path can include an intermediate frequency (IF) filter block operable for down-conversion of the RF carrier to an IF carrier to enable the selected RF bandwidth of the signal to be bandpass filtered at an IF filter bandwidth having an IF passband frequency range and the IF passband frequency range of the IF filter bandwidth is greater than the selected RF bandwidth. The down-conversion to the IF carrier can provide increased crossover attenuation or midband isolation of the RF carrier for the repeater.

Technology for a repeater is disclosed. The repeater can include a signal path configured to carry a signal having a selected radio frequency (RF) bandwidth on an RF carrier at a selected frequency. The signal path can include an intermediate frequency (IF) filter block operable for down-conversion of the RF carrier to an IF carrier to enable the selected RF bandwidth of the signal to be bandpass filtered at an IF filter bandwidth having an IF passband frequency range and the IF passband frequency range of the IF filter bandwidth is greater than the selected RF bandwidth. The down-conversion to the IF carrier can provide increased crossover attenuation or midband isolation of the RF carrier for the repeater.

A multiplexer includes a filter located between a common terminal and an individual terminal, and a filter that is located between the common terminal and an individual terminal and that has a pass band whose frequency is lower than the pass band of the filter. The filter includes serial arm resonators provided on the first path connecting the common terminal to the individual terminal. Each of the serial arm resonators includes a piezoelectric substrate and an IDT electrode which use leaky waves as principal acoustic waves. The occurrence frequency of the Rayleigh wave response of the serial arm resonator is different from that of the serial arm resonator.

A multiplexer includes a filter located between a common terminal and an individual terminal, and a filter that is located between the common terminal and an individual terminal and that has a pass band whose frequency is lower than the pass band of the filter. The filter includes serial arm resonators provided on the first path connecting the common terminal to the individual terminal. Each of the serial arm resonators includes a piezoelectric substrate and an IDT electrode which use leaky waves as principal acoustic waves. The occurrence frequency of the Rayleigh wave response of the serial arm resonator is different from that of the serial arm resonator.

A controller, a wireless module and a wireless repeater, by which a possibility of interruption of wireless communication between the controller and a wireless operation panel can be significantly reduced. The wireless system includes a robot and a controller for controlling the robot. When the robot is to be taught, a human uses a wireless teaching pendant so as to teach the robot. The controller has a wireless module for wirelessly communicating with the teaching pendant, and the wireless module is configured to receive a signal from the teaching pendant via at least one wireless repeater, as well as a signal directly transmitted from the teaching pendant. In other words, the wireless module receives a multiplexed signal generated by multiplexing signals from the teaching pendant by using at least one wireless repeater.

A first wireless device transmits to a second wireless device, a SIP REGISTER message comprising a first Contact header field comprising an internet Protocol multimedia subsystem (IMS) identifier identifying a mission critical video capability of the first wireless device. The second wireless device transmits to an IMS network entity, a second SIP REGISTER message comprising a second Contact header field comprising the IMS identifier. The IMS network entity identifies a mission critical application server (MC AS) and registers the first wireless device to the MC AS. The MC AS: receives a SIP request from the IMS network entity for the first wireless device; determines that a mission critical video service can be established employing the SIP request and the mission critical video capability; and transmits the SIP request to the first wireless device via the second wireless device.

A host computer connects to a data network via a host interface to a network interface controller A sideband interface connects the network interface controller to a baseboard management controller having a management network port for connection to a management network. A path is established in the network interface controller between the host interface the basement management controller via the sideband interface of the network interface controller to conduct data selectively between the management network and either the host central processing unit and the or internally in the network interface controller.

In a communication system that includes an access point, a repeater #1, and a repeater #2 and wirelessly communicates with a terminal, the access point wirelessly communicates with the repeater #1 on at least a first channel included in a first frequency band and wirelessly communicates with the repeater #2 on at least a second channel included in a second frequency band different than the first frequency band, the repeater #1 wirelessly communicates with the terminal on at least a third channel included in the second frequency band, and the repeater #2 wirelessly communicates with the terminal on at least a fourth channel included in the first frequency band.

A communication control method in a relay station that holds a donor base station list, is connected to a donor base station existing on the donor base station list, and performs relay transmission between the donor base station and a user terminal, comprises a step A of designating a neighboring base station, a step B of inquiring the neighboring base station designated in the step A of whether to accept or refuse the relay station, and a step C of updating the donor base station list in response to an inquiry result in the step B.