In some embodiments, a first computing device detects a loss of a connection to a first source of timing information that the first computing device and a second computing device use to maintain synchronization with a first clock and a second clock. The first computing device receives a second source of timing information from the second computing device. The second source of timing information is also being transmitted to a third computing device. The first computing device uses the second source of timing information to determine a first timestamp and determines a second timestamp from the first clock. The first computing device uses the first timestamp and the second timestamp to adjust a rate of the first clock where the first clock is used to transmit the second source of timing information from the second computing device to the third computing device.

In some embodiments, a first computing device detects a loss of a connection to a first source of timing information that the first computing device and a second computing device use to maintain synchronization with a first clock and a second clock. The first computing device receives a second source of timing information from the second computing device. The second source of timing information is also being transmitted to a third computing device. The first computing device uses the second source of timing information to determine a first timestamp and determines a second timestamp from the first clock. The first computing device uses the first timestamp and the second timestamp to adjust a rate of the first clock where the first clock is used to transmit the second source of timing information from the second computing device to the third computing device.

A system for transmitting and receiving radio signals is disclosed. The system includes a controller having a modem and a transmission amplifier module connected to the modem, an antenna unit arranged at a distance from the controller and having an antenna and a reception amplifier module connected to the antenna, and a high-frequency cable connecting the controller and the antenna unit.

A radio transmission apparatus (1) includes: a radio communication unit (2) that performs radio communication by a first radio communication scheme; a radio communication unit (3) that performs radio communication by a second radio communication scheme; an abnormality determination unit (4) that determines whether an abnormality has occurred in the radio communication performed by the radio communication unit (2); and a control unit (5) that controls transmission and reception of management information about the radio transmission apparatus (1) using the radio communication unit (2) or (3). When an abnormality has occurred in the radio communication performed by the radio communication unit (2), the control unit (5) performs control so that the management information is transmitted and received to and from a predetermined apparatus by using the radio communication unit (3).

A radio transmission apparatus (1) includes: a radio communication unit (2) that performs radio communication by a first radio communication scheme; a radio communication unit (3) that performs radio communication by a second radio communication scheme; an abnormality determination unit (4) that determines whether an abnormality has occurred in the radio communication performed by the radio communication unit (2); and a control unit (5) that controls transmission and reception of management information about the radio transmission apparatus (1) using the radio communication unit (2) or (3). When an abnormality has occurred in the radio communication performed by the radio communication unit (2), the control unit (5) performs control so that the management information is transmitted and received to and from a predetermined apparatus by using the radio communication unit (3).

A radio frequency circuit includes: a first filter having a first passband that corresponds to a portion of a frequency range of a first communication band allocated as a communication band for TDD; a second filter having a second passband that corresponds to a portion of the frequency range of the first communication band, the second passband being different from the first passband; a power amplifier that amplifies a transmission signal in the first communication band; a low-noise amplifier that amplifies a reception signal in the first communication band; and a switch that switches between connecting the first filter and the power amplifier and connecting the first filter and the low-noise amplifier, and switches between connecting the second filter and the power amplifier and connecting the second filter and the low-noise amplifier.

A method for transmitting data includes: sending, by a first device using a first transmission mode, first data to a second device, the first data being autonomously sent by the first device; and performing, by the first device using a second transmission mode, retransmission of all or part of the first data, the second transmission mode being different from the first transmission mode.

Embodiments are disclosed for an example telematics system for a vehicle. The example telematics system comprises a plurality of antennae capable of sending and receiving wireless signals, the plurality of antennae including a primary antenna and a backup antenna positioned adjacent to the primary antenna. The primary antenna comprises a three-dimensional antenna, and the backup antenna comprises a two-dimensional antenna.

In some embodiments, a first computing device detects a loss of a connection to a first source of timing information that the first computing device and a second computing device use to maintain synchronization with a first clock and a second clock. The first computing device receives a second source of timing information from the second computing device. The second source of timing information is also being transmitted to a third computing device. The first computing device uses the second source of timing information to determine a first timestamp and determines a second timestamp from the first clock. The first computing device uses the first timestamp and the second timestamp to adjust a rate of the first clock where the first clock is used to transmit the second source of timing information from the second computing device to the third computing device.

In some embodiments, a first computing device detects a loss of a connection to a first source of timing information that the first computing device and a second computing device use to maintain synchronization with a first clock and a second clock. The first computing device receives a second source of timing information from the second computing device. The second source of timing information is also being transmitted to a third computing device. The first computing device uses the second source of timing information to determine a first timestamp and determines a second timestamp from the first clock. The first computing device uses the first timestamp and the second timestamp to adjust a rate of the first clock where the first clock is used to transmit the second source of timing information from the second computing device to the third computing device.