Systems, methods, apparatuses, and computer program products for feeder link data transport are provided. For example, baseband in-phase and quadrature (IQ) data may be processed at the transmitter and receiver of the feeder link. The orthogonal frequency division multiplexing (OFDM) waveform used in a beam may be modified for transmission over the feeder link. For example, the waveform may have a wider subcarrier spacing (SCS) and may fill an enlarged bandwidth than otherwise with a feeder link.

Systems, methods, apparatuses, and computer program products for feeder link data transport are provided. For example, baseband in-phase and quadrature (IQ) data may be processed at the transmitter and receiver of the feeder link. The orthogonal frequency division multiplexing (OFDM) waveform used in a beam may be modified for transmission over the feeder link. For example, the waveform may have a wider subcarrier spacing (SCS) and may fill an enlarged bandwidth than otherwise with a feeder link.

The invention relates to a modular communication device having a master element with a control unit and bidirectional electrical control input-outputs, a series of modular elements having an upstream connection interface with a series of upstream input-output terminals disposed in locations forming a predetermined pattern, a downstream connection interface having a series of downstream input-output terminals disposed in locations forming the same predetermined pattern, a plurality of bidirectional electrical links connecting an upstream input-output terminal to a downstream input-output terminal in such a manner as to form a circular permutation between the ranks of the upstream and downstream input-output terminals electrically connected in pairs, and in which one of the electrical links is a local control link having an electronic communications module, the modular elements being connected to one another.

The invention relates to a modular communication device having a master element with a control unit and bidirectional electrical control input-outputs, a series of modular elements having an upstream connection interface with a series of upstream input-output terminals disposed in locations forming a predetermined pattern, a downstream connection interface having a series of downstream input-output terminals disposed in locations forming the same predetermined pattern, a plurality of bidirectional electrical links connecting an upstream input-output terminal to a downstream input-output terminal in such a manner as to form a circular permutation between the ranks of the upstream and downstream input-output terminals electrically connected in pairs, and in which one of the electrical links is a local control link having an electronic communications module, the modular elements being connected to one another.

A method and a device for realizing an optical channel data unit (ODU) shared protection ring (SPRing) are disclosed. The method includes: first, receive an ODUj, wherein the ODUj carries an ODUi; then, perform de-multiplexing processing to obtain the ODUi from the ODUj; next, multiplex the ODUi to an optical channel data unit k (ODUk); meanwhile, keep monitoring the ODUk; and when the monitoring result that is obtained through monitoring the ODUk indicates that a failure has occurred, perform a switching on the ODUi; wherein i, j, k are integers equal to or larger than 0, k is larger than j, j is larger than i, and i, j, k are used to indicate different rates of respective optical channel data unit (ODU) signals.

There is provided a communication method used in a communication system in which a plurality of communication apparatuses is connected by an optical ring network, the communication method including: setting one of the plurality of communication apparatuses as a master communication apparatus and the other communication apparatuses as slave communication apparatuses, causing the master communication apparatus to transmit an optical signal at transmission timing determined in the master communication apparatus; causing the master communication apparatus to transmit an assignment signal for assigning, to the slave communication apparatuses, transmission timing at which an optical signal on at least one wavelength is time-division multiplexed and transmitted; and causing the slave communication apparatuses to transmit an optical signal to the optical ring network based on transmission timing assigned by the assignment signal received from the master communication apparatus. As a result, the number of wavelengths needed for communication is reduced, and even when communication paths increases due to an increase in the number of optical transmission apparatuses, there is no need to increase the number of wavelengths, thereby solving the problem in economic efficiency.

A link adaptation method uses a selection criterion for selecting a transmission mode for transmitting PPDU frames over a channel of a telecommunications system. The system includes an access point and a plurality of stations having various different transmission modes associated with different data rates. Access to the channel being of the random type. The selection makes use of a time occupancy metric γ of the channel.

In an electronic component mounting device, a first multiplexing device of a head section which is attachable to and detachable from a Y-axis slider is connected to a second multiplexing device through an electric communication cable. The first multiplexing device, from which the cable is likely to be removed, is connected through the electric communication cable for which the communication failure due to dust or the like is relatively unlikely to occur. Second and third multiplexing devices, from which cables are less likely to be removed, are connected through the optical communication cable. The second multiplexing device separates data directed to the input and output device, among frame data received from the third multiplexing device, multiplexes only data directed to the first multiplexing device from the second multiplexing device, and transfers the multiplexed data to the first multiplexing device by the electric communication cable.

A large number of degrees for relays of optical signals transmitted via optical paths in the degrees is secured. A wavelength cross-connect device 20A performs a relay by splitting optical signals from respective degrees indicated by reference numerals 40l, 40h, 40m, 40q, each of the degrees being provided by optical fibers, via respective optical couplers and outputting the split optical signals to output sides of the plurality of degrees via respective WSSs 23a to 23d. As the optical couplers, variable couplers 27a to 27d whose respective splitting ratios, each of which is a ratio of optical signal power losses in splitting an optical signal, are variable are used. The wavelength cross-connect device 20A includes a control unit 26 that performs control to change the splitting ratios in such a manner as to eliminate an imbalance among OSNR margins of the output sides of the degrees in which a plurality of optical paths transmitting the split optical signals extend. The control unit 26 calculates the margins for the respective optical paths transmitting the split optical signals via the variable couplers 27a to 27d, for each of the output sides of the degrees. The control unit 26 performs control to, based on respective smallest margins of the degrees in all the margins, change the splitting ratios of the variable couplers 27a to 27d in such a manner as to eliminate an imbalance between the margins of the degrees.

A method includes: adjusting, by a base station based on a timing adjustment amount, an access timing advance corresponding to user equipment to obtain a target timing advance, where the access timing advance is a timing advance obtained when the user equipment randomly accesses the base station; determining, by the base station based on the target timing advance, whether the user equipment meets a trigger condition; and if the user equipment meets the trigger condition, sending, by the base station, a trigger signal to the user equipment, where the trigger signal is used to trigger the user equipment to send a first random access request to the base station.