Abstract: There is disclosed a method of operating a terminal (10) in a wireless communication network, the method comprising receiving and/or transmitting according to a transmission time interval, TTI, configuration, the TTI configuration indicating at least one short transmitting time interval having between one or two and seven symbols of duration in a subframe. There are also disclosed related methods and devices.

Abstract: Limited uplink bandwidth radio network devices are supported on wide bandwidth uplink carriers by configuring and controlling the use of multiple control regions within the uplink carrier bandwidth. In some embodiments, the total bandwidth of the uplink carrier is divided into a plurality of sub-band portions, wherein each sub-band portion includes at least one control region nominally dedicated to the transmission of uplink control signaling. Radio network devices are configured with a specified portion of the uplink carrier bandwidth for use for uplink transmission, which includes at least one control region. Radio network devices may be provisioned or provided with information regarding control regions reserved for control signaling by other radio network devices. The radio network devices may be dynamically configured to allow or suppress uplink data signaling in specified control regions, or portions thereof.

Abstract: A user equipment is configured with at least two collections of uplink resources to be used for transmitting control information to a communication network. The UE receives an assignment of radio resources to be used for receiving a downlink transmission from a base station of the communication network. The UE receives an acknowledgement resource indication, ARI, indicating one of the configured collections of uplink resources to be used for transmitting control information associated with the DL transmission. Further, the UE transmits the control information to the base station on at least a subset of the indicated collection of UL resources. In example embodiments, the indicated collection of uplink resources comprises a plurality of selectable uplink resource sets. The control information is transmitted on one of the uplink resource sets which corresponds to an operational state of the communication network.

Abstract: Techniques are provided to ensure that a terminal device is able to perform measurements efficiently when an on/off scheme is used by network nodes, particularly in a heterogeneous network environment. An example method, implemented in a network node, comprises obtaining a discovery signal window pattern, the discovery signal window pattern defining one or more discovery signal windows during which each of a plurality of cells is to transmit a corresponding discovery signal, and sending an indication of the discovery signal window pattern to a terminal device.

Abstract: According to certain embodiments, a user equipment, UE, is operable for multiple sub-carrier spacing values. The UE comprises memory operable to store instructions and processing circuitry operable to execute the instructions, whereby the UE is operable to determine one of a plurality of time-domain resource allocation tables based on first information received from a network node. The first information comprises a Radio Network Temporary Identifier, RNTI. The UE is operable to determine a time-domain resource allocated to the UE for transmission or reception of a wireless signal based on the determined one of the plurality of time-domain resource allocation tables and second information received from the network node. The second information comprises a time-domain resource allocation field value received in downlink control information, DCI. The UE is further operable to transmit or receive the wireless signal using the determined time-domain resource.

Abstract: There is presented a method for enabling multiple numerologies in a network. The method is performed by a user equipment (UE) and comprises receiving system information in a first search space on a broadcast channel with a first numerology, determining a second search space from the received system information, and receiving further information in the second search space with a second numerology. A UE, a base station, a computer program, and a computer program device are also presented.

Abstract: There is disclosed a method of operating a user equipment in a radio access network. The method comprises transmitting, during a transmission period, first signaling having a first set of transmission characteristics, and second signaling having second set of transmission characteristics, wherein the first set differs from the second set, wherein transmitting comprises including a transient protection interval in time domain between the first signaling and the second signaling. The disclosure also pertains to related devices and methods.

Abstract: There are provided mechanisms for monitoring search spaces. A first method performed by a wireless device comprises receiving an Orthogonal Frequency-Division Multiplexing (OFDM) symbol in a downlink slot. At least part of the OFDM symbol is included in a device-specific search space and in a common search space. The first method comprises monitoring the device-specific search space for at least one device-specific reference signal (RS) and monitoring the common search space for at least one non-device-specific RS. In a second method, a radio access network node transmits an OFDM symbol included in a device-specific search space and in a common search space. The device-specific search space contains a device-specific RS, or the non-device specific search space contains a non-device-specific RS, or both of these apply.

Abstract: The scheduling flexibility of CSI reference signals enables time and frequency synchronization using multiple non-zero CSI-RSs transmitted in the same subframe, or using CSI-RSs transmitted in the same subframe with other synchronization signals. Also, multiple synchronization signals may be scheduled in the same subframe to enable fine time and frequency synchronization without cell-specific reference signals.

Abstract: In one aspect, a wireless device receives a scheduling grant and a grant confirmation signal indicating that a network node has performed a CCA on a carrier and is releasing the carrier for the wireless device. An uplink message is transmitted on the carrier without performing a CCA on the carrier. In another aspect, a wireless device is connected to a first cell and a second cell configured on a carrier requiring an LBT protocol. The wireless device receives configuration messages indicating that downlink transmissions on the second cell are to be scheduled. This can mean self-scheduling for downlink on the second cell and cross-carrier scheduling for uplink on the first cell. The wireless device receives a scheduling grant in the first cell and performs a CCA in the second cell. The wireless device then transmits an uplink message responsive to success of the CCA.

Abstract: Techniques are provided to ensure that a terminal device is able to perform measurements efficiently when an on/off scheme is used by network nodes, particularly in a heterogeneous network environment. An example method, implemented in a network node, comprises obtaining a discovery signal window pattern, the discovery signal window pattern defining one or more discovery signal windows during which each of a plurality of cells is to transmit a corresponding discovery signal, and sending an indication of the discovery signal window pattern to a terminal device.

Abstract: Systems and methods relating to accurate Channel State Information (CSI) measurements for a License Assisted Secondary Cell (LA SCell) are disclosed herein. In some embodiments, a wireless device enabled to operate in a cellular communications network according to a carrier aggregation scheme using both a licensed frequency band and an unlicensed frequency band operates to determine whether a Channel State Information Reference Symbol (CSI-RS) transmission from a LA SCell of the wireless device is present in a subframe, where the LA SCell is in an unlicensed frequency band. The wireless device further operates to process a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe and refrain from processing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in the subframe.

Abstract: There are provided mechanisms for monitoring search spaces. A first method performed by a wireless device comprises receiving an Orthogonal Frequency-Division Multiplexing (OFDM) symbol in a downlink slot. At least part of the OFDM symbol is included in a device-specific search space and in a common search space. The first method comprises monitoring the device-specific search space for at least one device-specific reference signal (RS) and monitoring the common search space for at least one non-device-specific RS. In a second method, a radio access network node transmits an OFDM symbol included in a device-specific search space and in a common search space. The device-specific search space contains a device-specific RS, or the non-device specific search space contains a non-device-specific RS, or both of these apply.

Abstract: In one aspect, a wireless device receives a scheduling grant and a grant confirmation signal indicating that a network node has performed a CCA on a carrier and is releasing the carrier for the wireless device. An uplink message is transmitted on the carrier without performing a CCA on the carrier. In another aspect, a wireless device is connected to a first cell and a second cell configured on a carrier requiring an LBT protocol. The wireless device receives configuration messages indicating that downlink transmissions on the second cell are to be scheduled. This can mean self-scheduling for downlink on the second cell and cross-carrier scheduling for uplink on the first cell. The wireless device receives a scheduling grant in the first cell and performs a CCA in the second cell. The wireless device then transmits an uplink message responsive to success of the CCA.

Abstract: Embodiments herein relate to a method performed by a network node 110 of a wireless communication network 100 for communicating at an unlicensed frequency spectrum with a wireless device 121 having a device identity. The network node 110 sends an access grant to the wireless device according to the device identity, granting the wireless device access to an uplink communication channel of the unlicensed frequency spectrum. The network node also receives data from the wireless device 121, on the granted uplink communication channel, the data comprising information on the identity of the wireless device 121, thus enabling the network node 110 to detect whether the wireless device that was granted access on the uplink communication channel is the same wireless device as the wireless device from which the data comprising the information on the uplink communication channel was subsequently received. Embodiments of the network node 110 are also described.

Abstract: Example techniques for data retransmission in systems that do not utilize explicit hybrid automatic repeat request (HARQ) feedback are presented, including an example method (400) by a wireless device (102) that includes starting (402) a timer for a hybrid automatic repeat request (HARQ) process associated with a transport block (TB) transmission (105) by the wireless device (102) to the network node 106). The method (400) includes identifying (404) a HARQ policy (113) for the HARQ process, the HARQ policy (113) governing whether the wireless device (102) is to retransmit the TB or transmit a new TB where no HARQ feedback responsive to the TB transmission (105) is received from the network node (106) before the timer expires. Furthermore, the method (400) includes retransmitting (406) the TB or transmitting the new TB according to the HARQ policy (113) at a next periodic transmission occasion (307) for the HARQ process after the timer expires.

Abstract: A user equipment is configured with at least two collections of uplink resources to be used for transmitting control information to a communication network. The UE receives an assignment of radio resources to be used for receiving a downlink transmission from a base station of the communication network. The UE receives an acknowledgement resource indication, ARI, indicating one of the configured collections of uplink resources to be used for transmitting control information associated with the DL transmission. Further, the UE transmits the control information to the base station on at least a subset of the indicated collection of UL resources. In example embodiments, the indicated collection of uplink resources comprises a plurality of selectable uplink resource sets. The control information is transmitted on one of the uplink resource sets which corresponds to an operational state of the communication network.

Abstract: A method for protecting an X-ray source including: a liquid jet generator configured to form a liquid jet moving along a flow axis; an electron source configured to provide an electron beam interacting with the liquid jet to generate X-ray radiation; the method including: generating the liquid jet: monitoring a quality measure indicating a performance of the liquid jet; identifying, based on the quality measure, a malperformance of the liquid jet; and if said malperformance is identified, causing the X-ray source to enter a safe mode for protecting the X ray source. Further, to corresponding devices.

Abstract: A receiving node in a wireless communication network is operable to determining a process identifier for a repeated transmission by allocating, to a transmitting node, a plurality of resources for use with repeated transmissions, receiving a transmission from the transmitting node where the transmission uses at least one resource from the plurality of resources assigned to the transmitting node for use with repeated transmissions, and determining the process identifier for the transmission based on the at least one resource from the plurality of resources for use with repeated transmissions used by the transmission. Related methods and systems are also disclosed.

Abstract: According to some embodiments, a method for use in a wireless transmitter of a wireless communication network comprises providing control information relating to a slot. The control information includes an indication of whether the slot is of a first type or a second type. A slot of the first type starts at a slot interval boundary, and a slot of the second type either starts between slot interval boundaries and has arbitrary length or starts at a slot interval boundary and has reduced length. The control information includes an implicit or explicit reference signal timing indication if the slot is of the second type. The method further comprises transmitting the control information to a wireless receiver.