Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine timing misalignment information for a timing misalignment between an uplink timeline and a downlink timeline associated with a non-terrestrial cell. The UE may transmit the timing misalignment information to a satellite associated with the non-terrestrial cell. Numerous other aspects are described.

A method of enabling communication between a user equipment (UE) and a non-terrestrial network (NTN), is described. The UE may be able to calculate a timing advance compensation. The timing advance compensation may be a differential or full timing advance compensation. An offset value, K.sub.offset, may be indicated to the UE. The K.sub.offset value may be used for timing relationships.

Embodiments are directed towards systems and methods for a 5G PRB blanking system with 5G end user mobile devices to prevent interference with satellite signal transmission. One such method includes: configuring a 5G network to enable reversing an original direction of transmission upon request from a 5G end user mobile device; receiving a request to use a specified frequency at a specified time to communicate with the satellite; enabling the base station to stop download transmissions on specified frequency tones at the specified time; creating frequency notches at the specified time that are available for a 5G end user mobile device to upload to the satellite; and facilitating upload transmissions from a 5G end user mobile device to the satellite in the frequency notches at the specified time.

Disclosed in the present disclosure are channel selection and configuration methods and apparatuses. At a terminal side, the channel selection method provided in an embodiment of the present disclosure includes: determining a current signal transmission condition; and according to the current signal transmission condition and the configuration of a network, selecting the resources and channel format of a random access channel, and the random access channel uses a structure in which signal transmission is performed by using a means of repeated transmission by multiple preamble symbols.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine timing misalignment information for a timing misalignment between an uplink timeline and a downlink timeline associated with a non-terrestrial cell. The UE may transmit the timing misalignment information to a satellite associated with the non-terrestrial cell. Numerous other aspects are described.

This terminal comprises: a reception circuit that receives control information regarding a reference point for a reference time in control of the transmission timing of an uplink signal in a first cell to a second cell different from the first cell; and a control circuit that controls the transmission timing on the basis of the control information.

The techniques described herein include one or more solutions for enabling UEs to obtain initial uplink (UL) timing information (e.g., timing advance (TA) information) in a multi-transmission and reception point (TRP) scenario before a handover command and subsequent random access channel (RACH) procedure. A physical downlink (DL) control channel (PDCCH) order (e.g., downlink control information (DCI)) may be used to initiate a contention free random access (CFRA) procedure to obtain UL timing information for a non-serving TRP. The PDCCH order may be transmitted in a control resource set (CORESET) with a coresetPoolIndex value associated with a non-serving cell TRP. Several additional techniques and features are also described herein.

A bandwidth part switching method, is applicable to a non-terrestrial network (NTN) to implement BWP switching based on multi-color frequency-division multiplexing. In the method, a terminal device may report, in a second BWP to a network device, an index of a first SSB whose signal quality is greater than or equal to a first threshold in one or more SSBs in a first BWP, and switch from the second BWP to a third BWP. The one or more SSBs correspond to at least one BWP other than the first BWP, and the third BWP is in the at least one BWP and corresponds to the first SSB. After receiving the index of the first SSB in the second BWP, the network device determines the third BWP, and performs service data transmission with the terminal device in the third BWP.

At a high level, the technology disclosed herein relates to multi-non-terrestrial device coordination for enhanced antenna array(s). In embodiments, an anchor non-terrestrial device (e.g., a satellite), capable of communicating with a user device, may identify a second non-terrestrial device. Based on identifying the second non-terrestrial device, the anchor non-terrestrial device may establish a link (e.g., a high speed laser link) with the second non-terrestrial device for receiving time and frequency data from the second non-terrestrial device, the time and frequency data being associated with the second non-terrestrial device and the user device. The anchor non-terrestrial device may perform decoding operations on the time and frequency data for the generation of a synchronized antenna array uplink for the user device. In embodiments, a data packet received from the user device via the synchronized antenna array uplink may be transmitted.

A method for operating a user terminal in a satellite communication system includes receiving an uplink map from a satellite, the uplink map identifying a respective grant of radio resources in an uplink frame for the user terminal and at least one additional user terminal representing a set of user terminals. The uplink map is generated by the satellite. The satellite performs operations comprising: forming the set of user terminals into a plurality of bursts; computing available radio resources for each respective burst of the plurality of bursts; and allocating a respective grant of radio resources to the user terminal based on computing the available radio resources for each respective burst of the plurality of bursts. The user terminal transmits data in the uplink frame allocated for the user terminal based on the uplink map.