A method of searching for the presence of a useful signal of predefined spectral width ΔB in a multiplexing band having a spectral width greater than ΔB, includes calculating a frequency signal representative of a power spectral density in the multiplexing band, calculating a non-useful signal by filtering the frequency signal by means of a filter capable of suppressing all or part of signals having a spectral width equal to or smaller than ΔB, calculating a power ratio signal representative of the ratio of the frequency signal to the non-useful signal, and comparing the power ratio signal with a predefined threshold value. The method may be employed using a computer program product, a receiver unit, and/or a station of a digital telecommunications system comprising such a receiver unit.

Disclosed are a method for transmitting a reference signal, and a communication device. The method is executable by a terminal device or a network device, and comprises: determining at least one time domain resource unit for transmitting a reference signal; and transmitting the reference signal on the at least one time domain resource unit. Since the reference signal is transmitted on the at least one specific time domain resource unit rather than being transmitted by reusing a portion of subcarriers of a time domain resource unit for data transmission, a delay in transmission of the reference signal is reduced, thereby reducing a delay in data demodulation or CSI measurement performed on the basis of the reference signal, and reducing control signaling overhead for indication of a rate matching resource and complexity of performing rate matching.

A method of operating a first node to generate a secret key for encrypting wireless transmissions between the first node and a second node. The method comprises receiving a first training signal comprising a plurality of subcarriers from the second node and constructing a matrix from the frequency responses of each of the plurality of subcarriers of the first training signal at the first node. A singular value decomposition of the matrix is computed; and a secret key is derived from one or more singular vectors of the singular value decomposition.

A method of operating a first node to generate a secret key for encrypting wireless transmissions between the first node and a second node. The method comprises receiving a first training signal comprising a plurality of subcarriers from the second node and constructing a matrix from the frequency responses of each of the plurality of subcarriers of the first training signal at the first node. A singular value decomposition of the matrix is computed; and a secret key is derived from one or more singular vectors of the singular value decomposition.

A terminal is disclosed including a receiver that receives a demodulation reference signal; and a processor that controls reception of the demodulation reference signal based on a parameter related to mapping of the demodulation reference signal, wherein when the parameter is configured to a specific value, a specific multiplexing method for the demodulation reference signal is supported. In other aspects, another terminal is also disclosed.

A terminal is disclosed including a receiver that receives a demodulation reference signal; and a processor that controls reception of the demodulation reference signal based on a parameter related to mapping of the demodulation reference signal, wherein when the parameter is configured to a specific value, a specific multiplexing method for the demodulation reference signal is supported. In other aspects, another terminal is also disclosed.

Disclosed are a method for transmitting a reference signal, and a communication device. The method is executable by a terminal device or a network device, and comprises: determining at least one time domain resource unit for transmitting a reference signal; and transmitting the reference signal on the at least one time domain resource unit. Since the reference signal is transmitted on the at least one specific time domain resource unit rather than being transmitted by reusing a portion of subcarriers of a time domain resource unit for data transmission, a delay in transmission of the reference signal is reduced, thereby reducing a delay in data demodulation or CSI measurement performed on the basis of the reference signal, and reducing control signaling overhead for indication of a rate matching resource and complexity of performing rate matching.

An apparatus includes a reception processing unit configured to output a frequency division multiplexed signal obtained from a transmission signal transmitted over the wired communication network, an output control unit configured to output, in a case that apparatus identifying data matches signal specifying data, a frequency band specifying data indicating a frequency band corresponding to the signal specifying data, the apparatus identifying data being for requesting signal quality degradation, and the signal specifying data specifying a carrier signal requesting signal quality degradation among a plurality of carrier signals included in the frequency division multiplexed signal, a disturbing signal generation unit configured to generate a disturbing signal in a frequency band corresponding to the frequency band specifying data output by the output control unit, and a multiplexing unit configured to multiplex the frequency division multiplexed signal and the disturbing signal to output.

There is provided mechanisms for beamformed transmission towards groups of terminal devices. Each terminal device is, according to a bandwidth part (BWP) configuration, configured with a BWP set. One BWP in the BWP set is an active BWP for the terminal device. The method is performed by a network node. The method comprises configuring a new terminal device entering one of the groups with an active BWP based on frequency overlap avoidance with the active BWPs of the terminal devices already part of the group entered. The method comprises serving all terminal devices by performing beamformed transmission towards the terminal devices in accordance with the active BWPs.

There is provided mechanisms for beamformed transmission towards groups of terminal devices. Each terminal device is, according to a bandwidth part (BWP) configuration, configured with a BWP set. One BWP in the BWP set is an active BWP for the terminal device. The method is performed by a network node. The method comprises configuring a new terminal device entering one of the groups with an active BWP based on frequency overlap avoidance with the active BWPs of the terminal devices already part of the group entered. The method comprises serving all terminal devices by performing beamformed transmission towards the terminal devices in accordance with the active BWPs.