Abstract: Systems and methods for determining timing advance (TA) validity are disclosed. In some embodiments, systems and methods are disclosed herein in which a wireless device implicitly considers a TA to be valid in a full cell when no TA validation mechanisms are explicitly configured. In other embodiments, systems and methods are disclosed herein in which a timer serves a dual purpose. If the timer is set to infinity, a wireless device will always consider a TA to be valid within a given cell, and at the same time will disable other TA validation mechanisms. Otherwise, the wireless device will interpret the timer as indicating for how long the TA value that the wireless device possesses is considered to be valid. Benefits of the solutions described herein include reducing signaling bits in the configuration and avoiding the possibility of conflicting configurations.

Abstract: A method performed by a user equipment, UE, is provided. The method comprises detecting that the UE has lost navigation system coverage partially or wholly. The method further comprises, after the detection, transmitting towards a network node a loss notification indicating that the UE has the lost navigation system coverage.

Abstract: A method (1000) performed by a wireless device (110) includes obtaining (1002) location information associated with the wireless device and/or ephemeris data for a plurality of satellite cells. The wireless device receives (1004) a measurement configuration to measure reference signals from one or more satellite cells of the plurality of satellite cells. The wireless device dynamically adapts (1006) the measurement configuration based on the location of the wireless device and/or the ephemeris data for the one or more satellite cells. Based on the adapted measurement configuration, the wireless device measures (1008) a reference signal from the one or more satellite cells.

Abstract: A method performed by a user equipment. The method is for providing first information to a network node. The user equipment and the network node operate in a wireless communications network. The user equipment sends a first indication to the network node. The first indication indicates whether or not first information is being provided. The first information comprises at least one of: a) a quality report on a carrier used between the network node and the user equipment, and b) second information on subsequent transmissions from the user equipment to the network node or from the network node to the user equipment. The first indication is comprised in a payload of a Medium Access Control control element.

Abstract: Systems and methods for determining timing advance (TA) validity are disclosed. In some embodiments, systems and methods are disclosed herein in which a wireless device implicitly considers a TA to be valid in a full cell when no TA validation mechanisms are explicitly configured. In other embodiments, systems and methods are disclosed herein in which a timer serves a dual purpose. If the timer is set to infinity, a wireless device will always consider a TA to be valid within a given cell, and at the same time will disable other TA validation mechanisms. Otherwise, the wireless device will interpret the timer as indicating for how long the TA value that the wireless device possesses is considered to be valid. Benefits of the solutions described herein include reducing signaling bits in the configuration and avoiding the possibility of conflicting configurations.

Abstract: A method (1000) performed by a wireless device (110) includes obtaining (1002) location information associated with the wireless device and/or ephemeris data for one or more satellite cells. The wireless device receives (1004) a measurement configuration to measure reference signals from the one or more satellite cells. The measurement configuration includes at least one measurement window. The wireless device determines (1006) whether to select a measurement window for the one or more satellite cells based on the location information associated with the wireless device and/or ephemeris data of the one or more satellite cells.

Abstract: According to certain embodiments, a method is performed by a wireless device that does not support non-terrestrial network (NTN) communication. The method comprises receiving, from a network node, information configured to cause wireless devices that do not support NTN communication to avoid cell selection or re-selection to a candidate cell in the NTN. In response to receiving the information, the method comprises avoiding cell selection or re-selection to the candidate cell in the NTN.

Abstract: Embodiments described herein provide methods and apparatuses for performing one or more measurements of a neighbor cell during radio link monitoring, RLM. A method in a wireless device comprises detecting a radio link problem, RLP, on a serving cell operating in a first carrier frequency; responsive to detecting the RLP, determining a frequency relationship between the first carrier frequency and a second carrier frequency for performing the one or more measurements on the neighbor cell; and determining, based on the frequency relationship, one or more measurement occasions for performing the one or more measurements on the neighbor cell.

Abstract: According to some embodiments, a method performed by a wireless device for mobile-terminated early data transmission includes receiving a paging message from a network node. The paging message comprises an indication that the network node will use early data transmission to transmit downlink data to the wireless device. In response to receiving the paging message, the method includes selecting an early data transmission preamble and transmitting a random access message 1 to the network node. The message 1 includes the selected early data transmission preamble.

Abstract: Methods and systems are described for assisting a user equipment in moving from a first cell to a second cell in a telecommunications system. Embodiments include triggering the sending of ephemeris data, or other data, in a neighboring cell into which a user equipment is moving. The user equipment can send, while in a first cell, a request for triggering broadcast of data in the neighboring cell, according to configuration information. The user equipment can then enter the neighboring cell and receive the data.

Abstract: According to some embodiments, a method performed by a wireless device for cell selection or reselection in a non-terrestrial network (NTN) comprises determining whether to perform one or more cell selection or reselection measurements based on a cell selection or reselection criteria. The cell selection or reselection criteria is based on a signal quality of a serving cell and a relationship between the wireless device and a satellite or spot beam of the NTN. Upon determining that the cell selection or reselection criteria for performing measurements is satisfied, performing the one or more cell selection or reselection measurements.

Abstract: Systems and methods for determining timing advance (TA) validity are disclosed. In some embodiments, systems and methods are disclosed herein in which a wireless device implicitly considers a TA to be valid in a full cell when no TA validation mechanisms are explicitly configured. In other embodiments, systems and methods are disclosed herein in which a timer serves a dual purpose. If the timer is set to infinity, a wireless device will always consider a TA to be valid within a given cell, and at the same time will disable other TA validation mechanisms. Otherwise, the wireless device will interpret the timer as indicating for how long the TA value that the wireless device possesses is considered to be valid. Benefits of the solutions described herein include reducing signaling bits in the configuration and avoiding the possibility of conflicting configurations.

Abstract: A method by a wireless device includes obtaining, in a downlink control information (DCI) field, an indication of whether to perform a fallback to a radio resource control (RRC) connection setup or resume procedure or whether to abort a random access attempt. Based on the indication, wireless device determines to perform the fallback to the RRC connection setup or resume procedure or to abort the random access attempt.

Abstract: A method including receiving handover information associated with an execution of a handover and performing at least one operation of the handover based on the handover information. The handover information includes at least one of: a time offset; information for generating a time offset; an absolute time for executing the handover or for accessing the target cell; a condition to be fulfilled before execution of the handover; information associated with ephemeris data of a satellite serving the target cell; information associated with an upcoming service link switch or feeder link switch; information associated with a timing advance; a physical random access channel resource; an indication to execute a preconfigured handover command; an identifier associated with a preconfigured handover command; an indication for disabling fallback to a source cell; and a parameter for determining a quality of the source cell for fallback to the source cell.

Abstract: According to some embodiments, a method performed by a wireless device comprises: receiving a broadcast of full ephemeris data for a serving cell satellite, the broadcast of full ephemeris data occurring at a first periodicity; determining a position of the serving cell satellite based on the full ephemeris data; receiving a broadcast of delta ephemeris data for the serving cell satellite, the broadcast of delta ephemeris data occurring at a second periodicity more frequent than the first periodicity; and determining a position of the serving cell satellite based on the full ephemeris data and the delta ephemeris data.

Abstract: A method performed by a wireless device (110b, 110c) comprises receiving (612) system information (SI) broadcast from a network node, the SI broadcast received according to an aperiodic configuration. In particular embodiments, the aperiodic configuration comprises an initial period followed by a subsequent period, wherein a frequency of the SI broadcast during the initial period is greater than a frequency of the SI broadcast during the subsequent period. The initial period may occur when a satellite takes over coverage of a geographical area in which the wireless device is located, and the subsequent period may occur while the satellite maintains coverage of the geographical area in which the wireless device is located.

Abstract: A communication device can be configured to operate in a non-terrestrial network that includes a network node communicatively coupled to the communication device via a satellite. The communication device can determine when to perform an access offset determination (“AOD”) relative to a paging occasion (“PO”).

Abstract: A method by a wireless device includes determining whether one or more conditions for triggering measurements have occurred and performing the one or more measurements based on the occurrence of the one or more conditions. The one or more conditions for triggering measurements is based on at least one of: a timing advance value in a source cell; a distance between the wireless device and a satellite node serving a source cell or a candidate target cell; an expected time for the wireless device to be served in the source cell and/or in the candidate target cell; elevation angle of the satellite node serving the source cell and/or the candidate target cell; a point in time configured by a network node is reached; detection of an identifier associated with a specific cell; and a speed or velocity of the wireless device.

Abstract: A method by a wireless device includes determining whether one or more conditions for triggering measurement reporting have occurred and triggering the measurement reporting based on the occurrence of the one or more conditions. The one or more conditions for triggering the measurement reporting are based on at least one of: a timing advance value in a source cell; the wireless device being within a pre-determined distance of a satellite node serving the source cell and/or a candidate target cell of the wireless device; an expected time for the wireless device to be served in the source cell and/or in the candidate target cell; an elevation angle of the satellite node serving the source cell and/or the candidate target cell; a point in time configured by the network is reached; detection of an identifier associated with a specific cell.

Abstract: The invention refers to a method of operating a wireless device, UE, configured to provide communication over a radio interface with a wireless communication network, the method including transmitting a random access, RA, preamble of an RA procedure to the wireless communication network using a first uplink carrier; and after transmitting the RA preamble of the RA procedure, receiving a Random Access Response, RAR, of the RA procedure from the wireless communication network, wherein the RAR includes an indication to use a second uplink carrier different than the first uplink carrier; the invention further refers to a method of operating a base station of a wireless communication network configured to provide communication over a radio interface with a wireless device, UE, the method including receiving a random access, RA, preamble of an RA procedure from the wireless device using a first uplink carrier.