Methods, systems, and devices for updating timing advance values for deactivated cells are described. A user equipment (UE) may transmit, to a first cell that is deactivated, a random access message for a timing advance probing procedure. The UE may transmit the random access message to the first cell. In some examples, the UE may receive, from a second cell, an activation command that activates the first cell and an indication of a timing advance value for the first cell generated based on the random access message. In other examples, the UE may monitor for a random access response (RAR) message from the first cell, the RAR message including an activation command that activates the first cell and an indication of a timing advance value generated based on the random access message. The UE may communicate with the first cell based on the activation command and the timing advance value.

Methods, systems, and computer-readable mediums are configured to perform operations including detecting a plurality of synchronization signal blocks (SSBs) that are transmitted for a physical broadcast channel (PBCH), each of the SSBs having a SSB index comprising a set of bit values; detecting, from the plurality of SSBs, a first SSB received at a first time and a second SSB received at a second time that is different from the first time; decoding, for a first SSB of the plurality, first bit values of a first SSB index representing the first SSB and of a second SSB index representing the second SSB; determining, based on the first time and the second time, a receive time gap between the first SSB and the second SSB; and determining, based on the receive time gap and the first bit values of the first SSB index and the second SSB index, at least a second bit value of the first second SSB index representing the first SSB and the second SSB representing the second SSB.

This disclosure relates generally to wireless communications and, more particularly, to systems and methods for determining an adaptive random access response window length in non-terrestrial networks. In one embodiment, a method performed by a communication device includes: receiving system information from a communication node, wherein the communication node communicates using a satellite in orbit or a high altitude platform station (HAPS); and determining an adaptive random access response window length based on the system information and whether the communication device has access to situation information that: characterizes a location of the communication device, an ephemeris of the satellite or a trajectory of the HAPS, and a payload type of the satellite or the HAPS.

A mobile station device that receives control information having a downlink control information format and addressed by a Cell-Radio Network Temporary Identifier on a physical downlink control channel from a base station device. The mobile station device also transmits a random access preamble using a random access channel to the base station device based on receiving the control information which provides a random access order. The downlink control information format includes a first field for downlink resource assignment. In a first case that the downlink control information form at is used for the random access order, a fixed value is set to the first field, while in a second case in which the downlink control information format is used for downlink scheduling, a first value different from the fixed value is set to the first field.

Certain aspects of the present disclosure provide techniques for wireless communications by a user equipment (UE) including receiving a first reference signal (RS) from a first transmission reception point (TRP); receiving a second RS from a second TRP, wherein the first TRP and the second TRP are both associated with a BS; and transmitting, to the BS, an indication that one of a first shifted carrier frequency at which the first RS is received or a second shifted carrier frequency at which the second RS is received is preferred for use by the UE as a reference carrier frequency for demodulation.

Systems, methods, and non-transitory media are provided for timing half-duplex transmissions in a wireless communication system. An example method can include receiving, by a user terminal (UT), a radio frame transmitted by a satellite to a group of UTs; identifying an offset delay defined in the radio frame for scheduling transmissions between the satellite and each UT in the group of UTs, the offset delay providing non-overlapping time intervals for receive, process, and transmit operations at each UT; determining, based on the offset delay and a time when the radio frame was received by the UT, a time for transmitting an uplink radio burst to the satellite, wherein the uplink radio burst transmitted at the time is estimated to arrive at the satellite within a same radio frame interval as uplink radio bursts from other UTs; and transmitting, to the satellite, the uplink radio burst at the time.

Systems, methods, and devices for wireless communication that support mechanisms for identifying hyper frame number (HFN) desynchronization conditions and/or for triggering HFN resynchronization in a wireless communication system. In aspects, an HFN desynchronization condition is identified based on Ethernet frame validation. For example, aspects of the present disclosure provide mechanisms for validating and Ethernet frame. An HFN desynchronization condition is identified or detected when an Ethernet frame is determined to be corrupt based on the Ethernet frame validation in accordance with aspects herein. In some aspects, such as in Ethernet header compression (EHC) protocol implementations, an HFN desynchronization condition may be identified based on a determination that a deciphered context identification (CID) is not a valid CID (e.g., is not a CID in a set of valid CIDs).

Techniques are provided for informing a network of a timing source outage in a node and reestablishing a synchronized time in the node. An example method for providing a timing source outage notification includes detecting an outage of a timing source, determining one or more impacted nodes, generating one or more notification messages based at least in part on a communication context for each of the one or more impacted nodes, and transmitting the one or more notification messages.

A user equipment (UE), having Global Navigation Satellite System (GNSS) capabilities and capable of estimating a signal propagation delay between a non-terrestrial network (NTN) node and the UE based on Doppler frequency shift, is disclosed. The UE includes one or more non-transitory computer-readable media having computer-executable instructions embodied thereon, and at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to: transmit a GNSSOutageUE indication of a GNSS outage of the UE to a ground-based base station communicatively coupled to the NTN node; wherein the GNSSOutageUE indication is transmitted in at least one of: uplink control information (UCI); a periodic Channel State Information (CSI) report with CSI information; a Medium Access Control (MAC) Control Element (CE); and a Physical Uplink Control Channel (PUCCH).

The present disclosure discloses an information processing method and device, a terminal and a network device. The information processing method includes: sending first information associated with sending and receiving timing delay or timing error to a terminal and/or a second network device; wherein, the sending and receiving timing delay or timing error refers to signal transmission delay or delay error between an antenna unit of the terminal and a baseband unit of the terminal, or signal transmission delay or delay error between an antenna unit of a base station and a baseband unit of the base station; the first network device is the base station, the second network device is a positioning server; or, the first network device is the positioning server, and the second network device is the base station; the first information is internal delay information or delay error information of the terminal or the base station.