Abstract: A novel way for transmitting physical signals by a transmitter node (20, 40) based on the LBT principle, and informing a receiver node (30, 50) in cases where the transmission of the physical signals has been deferred or does not occur in a certain time resource, is presented. A transmitter node (20, 40) listens to a wireless radio channel during a first time resource. If there is no activity, or if the activity is below a threshold, the transmitter node (20, 40), in a second time resource, transmits an indicator indicating that one or more physical signals are also transmitted in the second time resource. A receiver node (30, 50) detects if an indicator is present in the time resource. If the receiver node (30, 50) detects the indicator, the receiver node (30, 50) may also receive and use one or more reference signals in the current time resource for doing one or more tasks.

Abstract: A novel way for transmitting physical signals by a transmitter node (20, 40) based on the LBT principle, and informing a receiver node (30, 50) in cases where the transmission of the physical signals has been deferred or does not occur in a certain time resource, is presented. A transmitter node (20, 40) listens to a wireless radio channel during a first time resource. If there is no activity, or if the activity is below a threshold, the transmitter node (20, 40), in a second time resource, transmits an indicator indicating that one or more physical signals are also transmitted in the second time resource. A receiver node (30, 50) detects if an indicator is present in the time resource. If the receiver node (30, 50) detects the indicator, the receiver node (30, 50) may also receive and use one or more reference signals in the current time resource for doing one or more tasks.

Abstract: According to some embodiments of inventive concepts, a method for carrier selection may be provided in a telecommunications system, with the telecommunications system including at least two network nodes. The method may include determining channel interference of the at least two network nodes, and ranking the at least two network nodes based on the channel interference of the at least two network nodes. Related network nodes are also discussed.

Abstract: There is provided a method, performed by a communication station, for Listen-Before-Talk, LBT, based medium access. The method comprises the step (S1) of performing an LBT-based medium access procedure including sensing a radio-based medium on a shared radio spectrum during a sensing duration, deferring transmission if an on-going transmission is detected during the sensing, and transmitting on the radio-based medium if no on-going transmission is detected during the sensing. The method further comprises the step (S2) of waiting, when the communication station has transmitted, for a waiting duration that is based on a time duration between consecutive sensing occasions for at least one other communication station, also operating according to an LBT-based medium access procedure on the shared radio spectrum, before performing the LBT-based medium access procedure again.

Abstract: Systems and methods are disclosed for controlling ON/OFF operation of a Secondary Cell (SCell) in a cellular communications network. In some embodiments, the SCell is a License Assisted Access (LAA) SCell that operates in an unlicensed frequency band. In some embodiments, a method of operation of a network node in the cellular communications network to dynamically control ON/OFF operation of a SCell of the cellular communications network comprises measuring activity of other wireless systems on a channel utilized by a SCell while the SCell is in an OFF state, determining whether to transition the SCell to an ON state based on the activity of the other wireless systems measured on the channel, turning the SCell ON upon determining that the SCell is to be transitioned to the ON state, and keeping the SCell in the OFF state upon determining that the SCell is not to be transitioned to the ON state.

Abstract: According to some embodiments of inventive concepts, a method for carrier selection may be provided in a telecommunications system, with the telecommunications system including at least two network nodes. The method may include determining Begin channel interference of the at least two network nodes, and ranking the at least two network nodes based on the channel interference of the at least two network nodes. Related network nodes are also discussed.

Abstract: There is disclosed a method for operating a radio node for a wireless communication network, the radio node being adapted for transmitting communication data on at least one carrier based on a timing relative to a pre-defined time structure. The method comprises defining at least one freeze interval relative to the pre-defined time structure, performing a Listen-Before-Talk, LBT, procedure to determine whether accessing the at least one carrier for transmission is allowed, and, if accessing the at least one carrier for transmission is determined to be allowed based on performing the LBT procedure, starting transmission of communication data on the at least one carrier outside the at least one freeze interval. There are also disclosed a corresponding node, system, program product and storage medium.

Abstract: The present disclosure pertains to a method of operating a wireless device in a wireless communication network, wherein the wireless device is adapted to transmit data based on pre-determined communication schedules, each communication schedule pertaining to a scheduling time interval of predetermined length. The method comprises determining, by the wireless device, a pattern of expected transmission accesses on at least a first transmission frequency spectrum accessed with Listen-Before-Talk (LBT), the pattern covering a plurality of scheduling time intervals. The disclosure also pertains to corresponding devices and further methods.

Abstract: A communication device (10, 100-1, 100-2, 100-3, 100-4) detects potentially colliding usage of transmission resources. Further, the communication device (10, 100-1, 100-2, 100-3, 100-4) detects cease of the potentially colliding usage of the transmission resources. After expiry of a backoff time period starting when detecting the cease of the usage of the transmission resources, the communication device (10, 100-1, 100-2, 100-3, 100-4) performs a transmission on the transmission resources. This transmission is performed synchronously with a further transmission on the transmission resources by at least one other communication device (10, 100-1, 100-2, 100-3, 100-4).

Abstract: There is provided a method, performed by a communication station, for Listen-Before-Talk, LBT, based medium access. The method comprises the step (S1) of performing an LBT-based medium access procedure including sensing a radio-based medium on a shared radio spectrum during a sensing duration, deferring transmission if an on-going transmission is detected during the sensing, and transmitting on the radio-based medium if no on-going transmission is detected during the sensing. The method further comprises the step (S2) of waiting, when the communication station has transmitted, for a waiting duration that is based on a time duration between consecutive sensing occasions for at least one other communication station, also operating according to an LBT-based medium access procedure on the shared radio spectrum, before performing the LBT-based medium access procedure again.

Abstract: A first communication device and method therein for transmitting data information at fixed time instants on a radio channel to a second communication device in a radio communications network. First, the first communication device determines that the radio channel is available for transmitting data information to the second communication device during a time period determined by the first communication device. Then, the first communication device transmits a preamble on the available radio channel after the time period. The first communication device thereafter transmits the data information on the available radio channel to the second communication device at a next fixed time instant following the transmission of the preamble.

Abstract: In one aspect, a device operating in a wireless communication network is configured to operate with at least a first carrier, or in carrier aggregation with the first carrier and a second carrier. The device dynamically determines a carrier sensing threshold for determining whether the first carrier is available for use by the device, based on channel information. The device also indicates an availability of the first carrier responsive to a CCA of the first carrier, based on the carrier sensing threshold. A CCA is performed based on the adaptive carrier sensing threshold.

Abstract: There is disclosed a method for operating a radio node for a wireless communication network, the radio node being adapted for transmitting communication data on at least one carrier based on a timing relative to a pre-defined time structure. The method comprises defining at least one freeze interval relative to the pre-defined time structure, performing a Listen-Before-Talk, LBT, procedure to determine whether accessing the at least one carrier for transmission is allowed, and, if accessing the at least one carrier for transmission is determined to be allowed based on performing the LBT procedure, starting transmission of communication data on the at least one carrier outside the at least one freeze interval. There are also disclosed a corresponding node, system, program product and storage medium.

Abstract: A novel way for transmitting physical signals by a transmitter node (20, 40) based on the LBT principle, and informing a receiver node (30, 50) in cases where the transmission of the physical signals has been deferred or does not occur in a certain time resource, is presented. A transmitter node (20, 40) listens to a wireless radio channel during a first time resource. If there is no activity, or if the activity is below a threshold, the transmitter node (20, 40), in a second time resource, transmits an indicator indicating that one or more physical signals are also transmitted in the second time resource. A receiver node (30, 50) detects if an indicator is present in the time resource. If the receiver node (30, 50) detects the indicator, the receiver node (30, 50) may also receive and use one or more reference signals in the current time resource for doing one or more tasks.

Abstract: Systems and methods are disclosed for controlling ON/OFF operation of a Secondary Cell (SCell) in a cellular communications network. In some embodiments, the SCell is a License Assisted Access (LAA) SCell that operates in an unlicensed frequency band. In some embodiments, a method of operation of a network node in the cellular communications network to dynamically control ON/OFF operation of a SCell of the cellular communications network comprises measuring activity of other wireless systems on a channel utilized by a SCell while the SCell is in an OFF state, determining whether to transition the SCell to an ON state based on the activity of the other wireless systems measured on the channel, turning the SCell ON upon determining that the SCell is to be transitioned to the ON state, and keeping the SCell in the OFF state upon determining that the SCell is not to be transitioned to the ON state.