A first communication device generates a range measurement packet (or a packet that includes a probe response frame, a TIM frame, etc.) associated with a range measurement signal exchange session between the first communication device and a second communication device. The first communication device records a time value of a first timer corresponding to a time of transmission of the packet, and includes timing information corresponding to the recorded time value in the packet. The first communication device transmits the packet to the second communication device. The timing information in the packet is useable by a third communication device to adjust time values corresponding to a second timer, which the third communication device includes.

Embodiments include methods and/or procedures for a user equipment (UE) to activate a secondary cell (SCell) for operating with the UE's primary serving cell (PSC). Embodiments include determining a receiver activity rate for the UE. Embodiments also include receiving, from the PSC, an activation request identifying the SCell. Embodiments also include activating the SCell based on the receiver activity rate. Other embodiments include complementary methods and/or procedures performed by a network node arranged to communicate with one or more UEs via a PSC and at least one selectively activated SCell. Other embodiments include UEs and network nodes configured to perform operations corresponding to various ones of the methods and/or procedures, as well as computer-readable media embodying such operations.

Systems, methods, apparatuses, and computer-readable storage media for communicating a base station signal, such as a data signal, a control signal, or both, from a base station to a user equipment (UE) during a measurement window. In some aspects, the UE signals its availability corresponding to a measurement window to a serving base station. In some aspects, the UE signals a guard period associated with the measurement window to the serving base station. In other aspects, the serving base station signals a guard period to the UE.

Methods, systems, and devices for wireless communications for determining a minimum time gap between an received downlink message and transmission of an uplink message in response to the received downlink message. In some cases, a user equipment (UE) may receive a downlink message to perform a random access procedure. The UE may determine a minimum time gap based on an uplink transmission preparation time. The UE may transmit a random access preamble based on the minimum time gap. In some examples, the UE may receive a timing advance (TA) command and may determine a minimum time gap between receipt of the TA command and transmission of a time-adjusted uplink message.

Disclosed is a method comprising obtaining a plurality of previous clock skews, a reported temperature and a reported time, based on the plurality of previous clock skews, the reported temperature and the reported time, obtaining a prediction of the current clock skew, determining a current clock offset based on the predicted current clock skew, determining a clock adjustment based on the current clock offset and the reported time, and determining a corrected time based on the clock adjustment.

Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support non-terrestrial network (NTN) signaling between both terrestrial and non-terrestrial devices. A user equipment (UE) supporting such NTN signaling may receive a downlink message indicating a first configuration for a first transmission reception point corresponding to a first cell of the NTN, and a second configuration for a second transmission reception point corresponding to a second cell of the NTN. The UE may then perform one or more synchronization measurements to synchronize uplink communications with the first transmission reception point and the second transmission reception point and in order to perform multi-transmission reception point communications in the NTN. The UE may then transmit one or more uplink messages to the first transmission reception point, to the second transmission reception point, or both, in accordance with the one or more synchronization measurements.

In order to provide a communication system and the like which are capable of updating a correction value of a time synchronization packet, and to which a traffic bonding scheme is applied, a set of primary devices of the communication system determines presence or absence of communication in a first transmission path, adds an actual measurement value of a first delay amount to an information value when a determination result according to the determination is that the communication is present, or adds, to the information value, a design value of a second delay amount being the delay amount inside the wireless transmission device and the wireless reception device when the determination result is that the communication is absent.

Various solutions for time and frequency in non-terrestrial network (NTN) communications are proposed. An apparatus implemented in a user equipment (UE) obtains a center frequency and a reference time of a non-terrestrial network. The apparatus further obtains a feeder link delay of a feeder link between a network node and a satellite, and a service link delay drift rate of a service link between the apparatus and the satellite. Then, the apparatus performs an uplink frequency pre-compensation through calculating an uplink transmit frequency according to the center frequency, the reference time, the feeder link delay, and the service link delay drift rate.

A communication device, method, and computer program product optimize cyclic or linear delay diversity for effective transmit diversity that increases transmit power by first and second transmit chains of the communication device while configured for uplink full power transmission mode 1. Using a precoding matrix codebook for multiple-input multiple-output transmission, a controller of the communication device sequentially configures the first transmit chain to transmit an uplink signal and the second transmit chain to transmit the uplink signal with a different phase shift or time delay value. While sequentially transmitting, the controller monitors a measure of uplink signal quality at a network node for each sequentially changed phase shift or time delay values. The controller determines and uses an optimum value for the phase shift or time delay value that results in an optimum uplink signal quality over the evaluated sequence of different phase shift or time delay values.

Systems, methods, and non-transitory media are provided for synchronization of multi-user uplink transmissions. An example method can include receiving, by a user terminal, a downlink radio frame transmitted by a satellite; determining, by the user terminal, a downlink propagation delay associated with the downlink radio frame and an uplink propagation delay associated with an uplink radio frame from the user terminal to the satellite; based on the downlink propagation delay and the uplink propagation delay, determining, by the user terminal, an uplink transmission delay indicating an amount of time to delay a transmission of the uplink radio frame to the satellite so the uplink radio frame is received at the satellite at a same target time as one or more additional uplink radio frames from one or more additional user terminals; and transmitting, by the user terminal, the uplink radio frame at a time corresponding to the uplink transmission delay.