Abstract: There are provided measures for enabling/realizing support for idle period communication in semi-static channel access. Such measures exemplarily comprise that a user equipment device monitors for presence of a clearance indication provided by a base station device serving the user equipment device, which indicates clearance for communication by the user equipment device in at least one idle period of abase station device frame period, disables communication by the user equipment device in the at least one idle period of the base station device frame period when the monitoring yields absence of the clearance indication, and enables communication by the user equipment device in the at least one idle period of the base station device frame period when the monitoring yields presence of the clearance indication.

Abstract: Various example embodiments provide efficient jitter control by means of a hybrid automatic repeat request (HARQ) process. Abase station may transmit to a UE a forwarding time parameter for data packet(s) associated with a HARQ process. The UE 110 may store the data packet(s) in a HARQ buffer and determine to hold the data packet(s) in the HARQ buffer until a delivery time determined based on the forwarding time parameter. Once the delivery time has been reached, the UE may forward the data packets to higher protocol layers. This enables efficient jitter control of a data packet flow. Apparatuses, methods, and computer programs are disclosed.

Abstract: An apparatus, method and computer program product for: performing channel availability monitoring on an operating channel for transmitting uplink control information for transmitting a data packet, in response to determining that the operating channel is available for transmitting the uplink control information, determining delay information relating to the channel availability monitoring, and transmitting the uplink control information and the delay information to the radio access network.

Abstract: The disclosure relates to an apparatus comprising: means for determining (1000) that a second sidelink synchronization reference user equipment extends synchronization coverage of a first sidelink synchronization reference user equipment; means for determining (1002) a first synchronization error between the first sidelink synchronization reference user equipment and the second sidelink synchronization reference user equipment and a second synchronization error between the first sidelink synchronization reference user equipment and the apparatus; and means for determining (1004) whether to operate the apparatus as a sidelink synchronization reference user equipment and extend the synchronization coverage of the first sidelink synchronization reference user equipment based on the first synchronization error and the second synchronization error.

Abstract: According to an aspect, there is provided an apparatus configured to perform the following. The apparatus establishes itself as a timing source terminal device for sidelink communication and estimates a first time uncertainty caused by the apparatus for sidelink communication. Then, the apparatus causes transmission of information on at least one of the first time uncertainty and a combined time uncertainty to one or more target terminal devices. The combined time uncertainty corresponds to a combination of the first time uncertainty and a second time uncertainty. The second time uncertainty corresponds to a time uncertainty of reference time defined in reference time information.

Abstract: According to an example aspect of the present invention, there is provided a method comprising, determining, by a network node, a timing offset (TOA) of a first wireless link, determining, by the network node, a timing offset (TOB) of a second wireless link, determining, by the network node, a timing offset (TOC) of a third wireless link, calculating, by the network node, a timing calibration value of the first sidelink device using the timing offset (TOA) of the first wireless link, the timing offset (TOB) of the second wireless link and the timing offset (TOC) of the third wireless link and transmitting, by the network node, at least the timing calibration value of the first sidelink device.

Abstract: Disclosed is a method comprising estimating a time synchronization accuracy associated with a plurality of base stations comprising at least a first base station and a second base station based at least partly on one or more uncertainty factors determined by the terminal device, selecting the second base station from the plurality of base stations by comparing the estimated time synchronization accuracy associated with the plurality of base stations, and synchronizing a clock based on the selected second base station.

Abstract: A method of transmitting data from a user equipment (UE) in a radio resource control (RRC) inactive state to a network node is described. The example method includes detecting presence of data for transmitting to the network node and determining whether the user equipment (UE) allows a mode of operation using pre-allocated resources in the RRC inactive state for user data transmission. The example method further includes transmitting the data from the user equipment (UE) to the network node in response to determining that the user equipment (UE) allows the mode of operations using pre-allocated resources in the inactive radio resource control (RRC) state for user data transmission.

Abstract: A method may include receiving, by a user equipment from a network entity, a first downlink (DL) control signal activating semi-persistent scheduling (SPS) of a first set of downlink data transmissions, the downlink control signal indicating an applicable hybrid automatic repeat request (HARQ) feedback timing for the first set of downlink data transmissions and receiving one or more of the first set of downlink data transmissions. The user equipment may determine that an applicable HARQ feedback timing for a second set of downlink data transmission previously received with an inapplicable HARQ feedback timing has not been provided. In response to the determination, the user equipment may determine a HARQ feedback timing for the one or more of the first set of downlink data transmissions based a second DL control signal indicating an applicable HARQ feedback timing received after reception of the one or more of the first set of downlink data transmissions.

Abstract: Example embodiments of the present disclosure relate to feedback to scheduling release feedback. According to embodiments of the present disclosure, there is provided a solution for feedback to a scheduling release indication. The first device receives control information which comprises a scheduling release indication. The scheduling release indication is associated with a hybrid automatic repeat request (HARQ) process. The first device transmits a feedback to the release indication on an occasion allocated for the HARQ process. In this way, the second device does not need to transmit the scheduling release indication for several times, thereby saving resources. Further, overhead can be saved.

Abstract: A grant free uplink data transmission is caused from a device using one of a plurality of subsets of a set of physical resource blocks. Each subset is associated with a transmission scheme, wherein at least a plurality of said subsets are associated with different transmission schemes.