Various embodiments of the present disclosure provide methods and apparatuses for random access resource mapping in a non-terrestrial network (NTN). According to an embodiment, the method implemented at a network node in the NTN includes determining at least a first synchronization signal (SS)/physical broadcast channel (PBCH) block, SSB, group having one or more SSBs and a second SSB group having one or more SSBs; mapping a respective number of random access resources to the one or more SSBs in the first SSB group and the one or more SSBs in the second SSB group separately; and transmitting configuration information indicating the mapping of the respective number of random access resources to the one or more SSBs in the first SSB group and the one or more SSBs in the second SSB group.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a base station in a wireless communication system includes identifying that a user equipment (UE) is out of a coverage of a satellite due to a discontinuous coverage (DC), and transmitting, to a network entity managing a mobility of the UE, a UE context release request message including a cause value for a UE context release.

Devices, methods, and systems for uplink synchronization in time division multiple access (TDMA) satellite network. In one embodiment, an earth-based satellite terminal is configured to communicate with a satellite hub through a satellite using the TDMA communication protocol. The earth-based satellite terminal is configured to determine its own location, a location of the satellite, estimate a distance between the location of the terminal and the location of the satellite, determine a Coarse Timing Advance based on the distance that is estimated, and transmit data to the satellite based on the Coarse Timing Advance and the TDMA communication protocol. The Coarse Timing Advance may allow uplink TDMA communication without a preamble transmission on a random access channel, the preamble transmission being required in many conventional systems.

In embodiments, a method performed by a non-terrestrial network (NTN) device includes transmitting a UE capability enquiry message to a user equipment (UE) and receiving a UE capability information message corresponding to the UE capability enquiry message from the UE. The UE capability information includes at least one of information for indicating one of a plurality of types of NTN non-geostationary satellite orbit (NGSO) or information on a maximum number of one or more satellites accessible in the UE.

Various aspects of the present disclosure relate to a UE that receives a first configuration associated with a set of positioning reference signals, where the first configuration indicates a time and frequency resource for a positioning reference signal of the set of positioning reference signals. The UE also receives a second configuration that associates a positioning measurement of the positioning reference signal on the time and frequency resource, and receives one or more types of polarization associated with the first configuration and/or the second configuration. The UE also transmits a report indicating the one or more types of polarization associated with the positioning measurement of the positioning reference signal on the time and frequency resource.

A method, device and computer readable medium are used to support satellite access. The registration management entity of the network determines information regarding which beam covering the location of the terminal device and the corresponding timing; the terminal device triggers a registration update based on the information determined by the registration management entity. Thus, the method, device and computer readable medium can introduce less modification to the network and have good compatibility.

Systems and methods are described for supporting dynamic antenna platform offset calibration for an antenna system mounted to a mobile vehicle. In particular, dynamic antenna platform offset calibration can be performed while communicating user data associated with the mobile vehicle (e.g., based at least in part on alignment calibration procedures including measurements of user data signals), with an antenna platform offset being updated when alignment calibration procedures have been performed at suitably separated spatial conditions. Accordingly, antenna platform offset calibration may be performed throughout the operation of the mobile vehicle without requiring that the vehicle be proactively aligned in a particular orientation for a dedicated calibration routine prior to using the antenna for communicating user data during normal operation of the mobile vehicle.

The disclosure relates in some aspects to location reporting and paging for satellite communication. In one aspect, the disclosure relates to a user terminal (UT) sending a message to report information about the UT's location. A threshold may be used to control whether (e.g., when) the UT reports its location. The location information may be used to enforce area (e.g., country) restrictions for the UT. In one aspect, the disclosure relates to forwarding paging messages between network access controllers. For example, a network access controller that is not able to page a UT may forward a paging message to another network access controller. In one aspect, the disclosure relates to a list of paging areas that indicates where a UT need not perform a paging area update.

A Registration Area (RA) supporting UE satellite access to a serving PLMN may correspond to a geodetic area (e.g. a circle) and may be determined by a network node (e.g. AMF) based on a current geodetic location of the UE. The UE may access a radio cell supported by a satellite for a serving PLMN. The UE may determine whether the radio cell provides coverage for the RA, e.g., based on whether an updated geodetic location of the UE is inside the RA or based on whether a geodetic coverage area of the radio cell covers at least part of the RA. The UE may perform a Registration with the serving PLMN via the radio cell when the radio cell is determined to not provide coverage for the RA. The serving PLMN may page the UE, when idle, using radio cells whose coverage includes at least part of the RA.

The present invention relates to a method performed by a terminal operating in a stand-alone non-public network (SNPN) connection mode in a communication system. The method comprises the steps of: receiving, from a base station, a radio resource control (RRC) release message including reservation configuration information; entering an RRC deactivation state on the basis of the RRC release message; performing a cell reselection procedure; and triggering an RNA update procedure when a cell selected according to the reselection procedure is not included in cell information included in notification area information.