Method, apparatus and system for updating system information - Patents.com

Abstract

A wireless communication method for use in a wireless terminal is disclosed, the method comprising the steps of receiving, from a radio network node, an update instruction associated with system information of a non-terrestrial based network, and obtaining the system information based on the update instruction.

Description

[Technical field]

[0001] This document is generally aimed at wireless communication, and specifically at non-terrestrial network communication. In particular, the present invention is directed to a method, an apparatus, and a system for updating system information. do. [Background technology]

[0002] In a non-terrestrial network (NTN), due to its long propagation delay, a user equipment (UE) with global navigation satellite system (GNSS) capability needs to pre-compensate the timing advance (TA) based on uplink synchronization assistance information provided by the network (NW). The NW broadcasts a common TA, TA drift rate, and TA drift variation, allowing the UE to compensate the TA between the satellite and the network node on the earth. In addition to the common TA, the UE may also compensate the TA between the UE and the satellite based on the ephemeris of the serving satellite so that the entire TA between the UE and the network node can be compensated. Summary of the Invention [Problem to be solved by the invention]

[0003] To ensure the accuracy of TA pre-compensation, a common TA, TA drift rate and variation, as well as ephemeris, and some other information used for random access with high accuracy should be provided. When considering the motion of the satellites, the NW needs to update such information frequently to ensure high accuracy. However, the existing system information update procedure may not be sufficient for such frequent updates. [Means for solving the problem]

[0004] This document relates to a method, a device and a system for updating system information, and in particular to a method, a device and a system for updating NTN system information.

[0005] The present disclosure relates to a wireless communication method for use in a wireless terminal, the method comprising: receiving an update instruction associated with system information of a non-terrestrial network from a radio network node; acquiring system information based on the update instruction; Includes.

[0006] Various embodiments are , below The following features may be implemented:

[0007] In some embodiments , the system information includes at least one of a common timing advance, TA, drift rate of the common TA, variation of drift rate of the common TA, x coordinate of a serving node position state vector in an Earth-centered, Earth-fixed ECEF coordinate system, y coordinate of a serving node position state vector in the ECEF coordinate system, z coordinate of a serving node position state vector in the ECEF coordinate system, x coordinate of a serving node velocity state vector in the ECEF coordinate system, y coordinate of a serving node velocity state vector in the ECEF coordinate system, z coordinate of a serving node velocity state vector in the ECEF coordinate system, a semi-major axis of the serving node, an eccentricity of the serving node, an anomaly argument of the serving node, a nodal longitude of the serving node, an inclination of the serving node, a mean anomaly angle in an epoch time of the serving node, a validity period of the system information, an epoch time of the system information, polarization information of downlink transmissions on the serving link, polarization information of an uplink serving link, a reference position of the serving cell, time information indicating when a cell is about to cease serving an area covered by the cell, or an indication of a terminal specific TA report.

[0008] In some embodiments The step of acquiring the system information based on the update instruction includes acquiring the system information when a validity period indicated by the update instruction has elapsed.

[0009] In some embodimentsThe wireless communication method further includes a step of receiving, from the wireless network node, an indication bit set to indicate a modification of the broadcast channel, and the step of obtaining system information based on the update indication includes obtaining the system information when a value tag included in the update indication is updated.

[0010] In some embodiments , the maximum value of the value tag is greater than 31.

[0011] In some embodiments , the value tag is configured for the system information block that contains the system information.

[0012] In some embodiments The step of acquiring system information based on the update instruction includes: Obtaining the system information when an indication bit included in the update indication indicates that the system information has been updated. Includes.

[0013] In some embodiments , the indication bit is in the short message or page downlink control information.

[0014] In some embodiments ,The system information is obtained via a broadcast channel or a radio resource control message.

[0015] In some embodiments , the system information includes at least one of uplink synchronization assistance information or system information dedicated to non-terrestrial based networks.

[0016] The present disclosure relates to a wireless communication method for use in a radio network node, the method comprising: transmitting, to the wireless terminal, an update instruction associated with system information of the non-terrestrial network; transmitting system information to a wireless terminal; Includes.

[0017] Various embodiments are , belowThe following features may be implemented:

[0018] In some embodiments , the system information includes at least one of a common timing advance, TA, drift rate of the common TA, variation of drift rate of the common TA, x coordinate of a serving node position state vector in an Earth-centered, Earth-fixed ECEF coordinate system, y coordinate of a serving node position state vector in the ECEF coordinate system, z coordinate of a serving node position state vector in the ECEF coordinate system, x coordinate of a serving node velocity state vector in the ECEF coordinate system, y coordinate of a serving node velocity state vector in the ECEF coordinate system, z coordinate of a serving node velocity state vector in the ECEF coordinate system, a semi-major axis of the serving node, an eccentricity of the serving node, an anomaly argument of the serving node, a nodal longitude of the serving node, an inclination of the serving node, a mean anomaly angle in an epoch time of the serving node, a validity period of the system information, an epoch time of the system information, polarization information of downlink transmissions on the serving link, polarization information of an uplink serving link, a reference position of the serving cell, time information indicating when a cell is about to cease serving an area covered by the cell, or an indication of a terminal specific TA report.

[0019] In some embodiments The update instruction includes a validity period of the system information.

[0020] In some embodiments , the update indication includes a value tag to be updated, and the method further includes the step of transmitting, to the wireless terminal, an indication bit set to indicate a modification of the broadcast channel.

[0021] In some embodiments , value The maximum tag value is greater than 31.

[0022] In some embodiments , the value tag is configured for the system information block that contains the system information.

[0023] In some embodiments, the update indication includes an indication bit that is set to indicate that the system information has been updated.

[0024] In some embodiments , the indication bit is in the short message or page downlink control information.

[0025] In some embodiments ,The system information is transmitted via a broadcast channel or a radio resource control message.

[0026] In some embodiments , the system information includes at least one of uplink synchronization assistance information or system information dedicated to non-terrestrial based networks.

[0027] The present disclosure relates to a wireless terminal. a communication unit configured to receive an update instruction associated with system information of a non-terrestrial based network from a radio network node; a processor configured to obtain system information based on the update instruction; Equipped with.

[0028] Various embodiments are , below The following features may be implemented:

[0029] In some embodiments The processor is further configured to perform any of the wireless communication methods described above.

[0030] The present disclosure relates to a radio network node, the radio network node comprising: Transmitting an update instruction associated with system information of the non-terrestrial network to the wireless terminal; Transmitting system information to the wireless terminal; A communication unit configured as follows: Equipped with.

[0031] Various embodiments are , below The following features may be implemented:

[0032] In some embodiments , the radio network node further comprises a processor configured to perform any of the wireless communication methods described above.

[0033] The present disclosure relates to a computer program product having stored thereon a computer readable program medium code which, when executed by a processor, causes the processor to perform a wireless communication method as described in any one of the preceding wireless communication methods.

[0034] Exemplary embodiments disclosed herein are directed to providing features that will be readily apparent from the following description taken in conjunction with the accompanying drawings. According to various embodiments, exemplary systems, methods, devices, and computer program products are disclosed herein. However, it is understood that these embodiments are presented by way of example and not limitation, and it will be apparent to those skilled in the art upon reading this disclosure that various modifications can be made to the disclosed embodiments while remaining within the scope of the present disclosure.

[0035] Therefore, the present disclosure is not limited to the exemplary embodiments and applications described and illustrated herein. In addition, the specific order and / or hierarchy of steps in the methods disclosed herein are merely exemplary approaches. Based on design preferences, the specific order or hierarchy of steps of a disclosed method or process can be rearranged while remaining within the scope of the present disclosure. Thus, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and that the present disclosure is not limited to the specific order or hierarchy presented, unless expressly stated otherwise.

[0036] These and other aspects and their implementations are described in more detail in the drawings, description, and claims. [Brief description of the drawings]

[0037] [Figure 1] 1 is a schematic diagram of a network according to some embodiments of the present disclosure. [Diagram 2] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Diagram 3] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Diagram 5] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 6] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 7] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 8] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 9] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 10] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 11] FIG. 1 is a schematic diagram of a procedure according to some embodiments of the present disclosure. [Figure 12] FIG. 2 illustrates an example schematic diagram of a wireless terminal according to some embodiments of the present disclosure. [Figure 13] FIG. 2 illustrates an example schematic diagram of a radio network node according to some embodiments of the present disclosure. [Figure 14] 1 is a flowchart of a method according to some embodiments of the present disclosure. [Figure 15] 1 is a flowchart of a method according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] FIG. 1 is a block diagram of the present disclosure. SomeA schematic diagram of a network (architecture) according to an embodiment is shown. In FIG. 1, the network (architecture) comprises a user equipment (UE) and a network (NW) (entity). The NW may include one or more network nodes and / or network entities, such as a radio access network (RAN) node, an access and mobility management function (AMF), a session management function (SMF), a policy control function (PCF), a user plane function (UPF), an application function (AF), a unified data management (UDM), etc. The network in FIG. 1 may be a NTN. That is, the UE may communicate with the NW via a star, a stratospheric platform (HAPS), a HAPS as an international mobile communication base station (HIBS), an airplane, or an unmanned aerial vehicle (UAV).

[0039] The present disclosure Some In an embodiment, the UE receives an indication indicating that the uplink synchronization assistance information or the system information including the synchronization assistance information has been updated, and (in response) obtains updated uplink synchronization assistance information or the system information including the synchronization assistance information. Some The process according to the embodiment includes the following. Step 1: A UE receives an indication from a network indicating that uplink synchronization assistance information or system information including synchronization assistance information has been updated. Step 2: The UE acquires (in response to the received indication) system information including uplink synchronization assistance information or synchronization assistance information.

[0040] Some In an embodiment, the uplink synchronization assistance information includes one or more of the following parameters: -Network control common TA, e.g. TACommon - drift rate of common TA, e.g. TACommonDrift -Common TA drift rate variance, e.g. TACommonDriftVariation -x coordinate of the serving satellite position state vector in ECEF, e.g. ServingSatelliteEphemerisStateVectorX - y coordinate of the serving satellite position state vector in ECEF, e.g. ServingSatelliteEphemerisStateVectorY - The z coordinate of the serving satellite position state vector in the ECEF, e.g., ServingSatelliteEphemerisStateVectorZ - the x-coordinate of the serving satellite velocity state vector in ECEF, e.g. ServingSatelliteEphemerisStateVectorVx, in m / s. - The y coordinate of the serving satellite velocity state vector in ECEF, e.g. ServingSatelliteEphemerisStateVectorVy, in m / s. - The z coordinate of the serving satellite velocity state vector in ECEF, e.g. ServingSatelliteEphemerisStateVectorVz, in m / s. - the semi-major axis α of the serving satellite, e.g. ServingSatelliteEphemerisSemiMajorAxis - Serving satellite eccentricity, e.g. ServingSatelliteEphemerisEccentricityE - the periapsis argument ω of the serving satellite, e.g. ServingSatelliteEphemerisArgumentOfPeriapsis - the serving satellite's ephemeris longitude Ω, e.g., ServingSatellite EphemerisLongitudeOfAscendingNode - the inclination of the serving satellite i, e.g. ServingSatelliteEphemerisInclinationI - Mean anomaly M [rad] at the epoch time of the serving satellite, e.g., ServingSatelliteEphemerisMeanAnomalyM - A validity period configured by the network for the uplink synchronization assistance information (i.e., serving satellite ephemeris and common TA parameters). The validity period indicates the maximum time that the UE can apply the assistance information without acquiring new assistance information, e.g., ntnUlSyncValidityDuration. -Epoch time of the uplink synchronization assistance information (i.e., serving satellite ephemeris and common TA parameters), e.g., EpochTime. When explicitly provided by the system information block (SIB) or through dedicated signaling, the epoch time is the start time of the DL subframe indicated by the system frame number (SFN) and subframe number signaled together with the uplink synchronization assistance information. The reference point of the epoch time of the serving satellite ephemeris and common TA parameters is the uplink time synchronization reference point. Polarization information for downlink transmission on the service link (eg, ntnPolarizationDL): This polarization information indicates right-hand circular polarization, left-hand circular polarization (RHCP, LHCP), and linear polarization. - Polarization information for the uplink service link (e.g., ntnPolarizationUL). If ntnPolarizationUL is not present and ntnPolarizationDL is present, the UE assumes the same polarization for both UL and DL transmission. - The reference position of the serving cell, e.g. the position of the cell center. -Time information indicating when the cell will stop serving the area it currently covers, e.g. t-Service. -Instruction for UE-specific timing advance reporting, e.g. enableTA-Report-r17.

[0041] Some In an embodiment, the indication that the uplink synchronization assistance information or system information including the synchronization assistance information has been updated may be configured in various forms.

[0042] For example, the indication indicating that the uplink synchronization assistance information or the system information including the synchronization assistance information has been updated may include a validity period of the information included in the uplink synchronization assistance information. The UE starts a timer (e.g., T3xx) upon receiving the validity period, and considers such uplink synchronization assistance information to be updated when or after the timer expires. In this embodiment, the uplink synchronization assistance information may be included in an existing SIB or a newly introduced SIBX for the NTN. The uplink synchronization assistance information may be divided into multiple parts with different validity periods. For example, the satellite ephemeris of the serving satellite may be represented in two different formats. Format 1: State Vector, e.g., ServingSatelliteEphemerisStateVectorX, ServingSatelliteEphemerisStateVectorY, ServingSatelliteEphemerisStateVectorZ, ServingSatelliteEphemerisStateVectorVx, ServingSatelliteEphemerisStateVectorVy, and ServingSatelliteEphemerisStateVectorVz. Format 2: Orbital elements, e.g., ServingSatelliteEphemerisSemiMajorAxis, ServingSatelliteEphemerisEccentricityE, ServingSatelliteEphemerisArgumentOfPeriapsis, ServingSatellite EphemerisLongitudeOfAscendingNode, ServingSatelliteEphemerisInclinationI, and ServingSatelliteEphemerisMeanAnomalyM.

[0043] The network may broadcast the satellite ephemeris (uplink synchronization assistance information having / including) in both formats 1 and 2, and configure a validity period for each of the satellite ephemeris in formats 1 and 2 separately. For example, the network may configure a validity period t1 for the satellite ephemeris (uplink synchronization assistance information having / including) in format 1, and another validity period t2 for the satellite ephemeris (uplink synchronization assistance information having / including) in format 2. As a result, the UE may start and maintain separate timers for the satellite ephemeris in each format upon reception. Note that the validity periods t1 and t2 may be the same or different. Similarly, another parameter in the uplink synchronization assistance information corresponding to the satellite ephemeris in format 1 may be the same or different from that corresponding to the satellite ephemeris in format 2.

[0044] Alternatively or additionally, all parameters in the uplink synchronization assistance information may be included in an existing SIB or a newly introduced SIB, hereinafter referred to as a SIB containing uplink synchronization assistance information. In this embodiment, the UE considers the uplink synchronization assistance information in the existing SIB or the newly introduced SIB to be updated when one of the following indications is provided: Indication form 1: A value tag in the range of 0 to 511 is introduced for the SIB including the uplink synchronization assistance information. In this embodiment, when the SIB including the uplink synchronization assistance information is updated, the NW sets systemInfoModification in the short message to 1 and updates the value tag of this SIB for notifying the UE. Upon receiving systemInfoModification set to 1, the UE checks the value tag provided in the SIB including the uplink synchronization assistance information and considers / determines that the uplink synchronization assistance information in the SIB is updated when the value tag is updated (e.g., changed / fluctued).

[0045] For example, a SIB including a value tag indicating whether the uplink synchronization assistance information has been updated may be realized by: SchedulingInfo ::= SEQUENCE { si-BroadcastStatus ENUMERATED {broadcasting, notBroadcasting}, si-Periodicity ENUMERATED {rf8, rf16, rf32, rf64, rf128, rf256, rf512}, sib-MappingInfo SIB-Mapping } SIB-Mapping ::= SEQUENCE (SIZE (1..maxSIB)) OF SIB-TypeInfo SIB-TypeInfo ::= SEQUENCE { type ENUMERATED {sibType2, sibType3, sibType4, sibType5, sibType6, sibType7, sibType8, sibType9, sibType10-v1610, sibType11-v1610, sibType12-v1610, sibType13-v1610, sibType14-v1610, spare3, spare2, spare1,...}, valueTag INTEGER (0..31) OPTIONAL, -- Cond SIB-TYPE ValueTag-r17 INTEGER (0..511) OPTIONAL, -- Cond SIB-TYPE1 areaScope ENUMERATED {true} OPTIONAL -- Need S } --TAG-SI-SCHEDULINGINFO-STOP --ASN1STOP

[0046] It should be noted that ValueTag-R17, whose value is in the range of 0 to 511, is configured for a SIB containing uplink synchronization assistance information and is configured to indicate whether the uplink synchronization assistance information in the SIB has been updated or not. ValueTag-R17, whose value is in the range of 0 to 511, can be introduced in an existing SIB1 or a new SIB1 containing scheduling information for NTN / HAPS specific SIBs.

[0047] Some In an embodiment, the existence conditions of the newly introduced value tags can be found in Table 1. [Table 1]

[0048] In this embodiment, the SIB containing the uplink synchronization assistance information includes a field "SIB-TYPE1", for example, to distinguish it from other SIBs.

[0049] Some In an embodiment, the short message associated with the instruction to check the value tag indicating whether the uplink synchronization assistance information has been updated is implemented as Table 2. [Table 2]

[0050] In an embodiment of instruction form 1, the short message sent to the UE includes systemInfoModification set to 1 (i.e., the first bit in the short message) to instruct / instruct the UE to check the value tag introduced in the SIB containing the uplink synchronization assistance information.

[0051] Instruction form 2: SomeIn an embodiment, a new indication bit, for example uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification, is introduced in a short message or page downlink control information (DCI) for a SIB containing uplink synchronization assistance information. The SIB containing uplink synchronization assistance information may also contain other information associated with NTN or HAPS (i.e., NTN / HAPS system information). The UE may determine that the uplink synchronization assistance information in this SIB has been updated when the newly introduced indication bit is set to 1.

[0052] Some In an embodiment, the short message may be implemented as shown in Table 3. [Table 3]

[0053] In this embodiment, the fourth bit in the short message, uplinkSyncAssistanceInfoIndication, is used to indicate whether the uplink synchronization assistance information is updated / modified, for example, the fourth bit in the short message, uplinkSyncAssistanceInfoIndication, is set to 1 to indicate the modification / update of the uplink synchronization assistance information.

[0054] Some In an embodiment, the short message may be implemented as shown in Table 4. [Table 4]

[0055] In this embodiment, the fourth bit in the short message, ntnsystemInfoModification, is used to indicate whether system information associated with the NTN or HAPS (e.g., uplink synchronization assistance information and / or other NTN-specific parameters) has been updated / modified. For example, the fourth bit in the short message, ntnsystemInfoModification, is set to 1 to indicate modification / update of system information associated with the NTN or HAPS.

[0056] Some In an embodiment, the UE may obtain updated uplink synchronization assistance information in at least one of the following cases: Case 1: Some In an embodiment, a validity period of the uplink synchronization assistance information is configured. The UE starts a timer, e.g., T3xx, when the validity period is received, and starts to acquire updated uplink synchronization assistance information when the timer expires or thereafter. The UE may check the scheduling information of the SIB including the uplink synchronization assistance information, and reacquire SIB1 to acquire an updated SIB based on the scheduling information. Case 2: Some In an embodiment, a value tag in the range [0,511] is introduced for the SIB containing the uplink synchronization assistance information. The SIB can be an existing SIB or a newly introduced SIBX. The UE starts to acquire an updated SIB containing the uplink synchronization assistance information when it receives a short message containing systemInfoModification set to 1 and the value tag of this SIB is updated. Upon or after receiving a short message containing systemInfoModification set to 1, the UE reacquires the MIB and / or SIB1 from the next modification period and checks the value tag in the scheduling information of the SIB containing the uplink synchronization assistance information. If the value tag is updated, the UE acquires an updated SIB, for example based on the corresponding scheduling information. Case 3: SomeIn an embodiment, a new indication bit, such as uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification, is introduced in the short message or paging DCI for the SIB containing uplink synchronization assistance information and / or NTN-specific system information. The UE then updates the SIB and / or the updated SIB according to the scheduling information in the valid SIB1 or the latest SIB1. is N Gets TN-specific system information.

[0057] The following operations may be performed by the UE when the UE begins to acquire updated SIB and / or NTN-specific system information. - Some In an embodiment, the UE is NTN-enabled, the indication bit of the short message (e.g., uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification) is set to 1, and the UE is provided with searchSpaceSIB1 and searchSpaceOtherSystemInformation on an active or initial BWP. In this embodiment, the UE reacquires SIB1 (immediately). If si-SchedulingInfo in SIB1 includes a SIB containing uplink synchronization assistance information and / or scheduling information of NTN-specific system information, the UE acquires the SIB as specified (immediately). - Some In an embodiment, the UE obtains the master information block (MIB), SIB1, and the updated SIB from the start of the next modification period. - Some In an embodiment, the UE may obtain the updated uplink synchronization assistance information in at least one of the following ways: -For UEs in idle and inactive modes, if the broadcast status of the SIB containing the updated uplink synchronization assistance information is set to broadcasting, the UE shall receive the updated SIB via the broadcast channel (BCCH) according to the scheduling information in SIB1. -For UEs in idle and inactive modes, if the broadcast status of SIB1 containing the updated uplink synchronization assistance information is set to notBroadcasting, the UE requests the SIB via Msg1 or RRCSystemInfoRequest, and the NW begins broadcasting the requested SIB so that the UE can obtain the requested SIB. -For a UE in connected mode, if the broadcast status of the SIB containing the updated uplink synchronization assistance information is set to broadcasting and the UE has an active BWP configured with a common search space with field searchSpaceOtherSystemInformation, the UE obtains the updated SIB containing the updated uplink synchronization assistance information via the BCCH according to the scheduling information in SIB1. -For a UE in connected mode, if the broadcast status of a SIB containing updated uplink synchronization assistance information is set to notbroadcasting and the UE has an active BWP configured with a common search space with field searchSpaceOtherSystemInformation, the UE requests the SIB via DedicatedSIBRequest, and the NW may start providing the updated SIB via BCCH or via dedicatedSystemInformationDelivery in an RRCReconfiguration message according to the scheduling information in SIB1. -For a UE in connected mode, if the UE has an active BWP that is not configured with a common search space with the field searchSpaceOtherSystemInformation, the UE requests a SIB via a DedicatedSIBRequest and the NW requests a SIB with the field searchSpaceOtherSystemInformation for the active BWP. nand may start providing updated SIBs via BCCH according to the scheduling information in SIB1 or may start providing requested SIBs via dedicatedSystemInformationDelivery in the RRCReconfiguration message.

[0058] FIG. 2 is a block diagram of the present disclosure. Some embodiments FIG. 2 shows a schematic diagram of a procedure according to the method of the present invention. In FIG. 2, the modification / update of the uplink synchronization assistance information is indicated by the validity period of the uplink synchronization assistance information. Specifically, the procedure shown in FIG. 2 includes: Step 201: The UE obtains system information broadcast from the NW. The system information includes a SIBX including uplink synchronization assistance information and / or other NTN-specific parameters. The SIBX may be a NTN-specific SIB or an existing SIB. In this embodiment, a validity period, for example, ntnUlSyncValidityDuration, is also provided as the validity period of the uplink synchronization assistance information or all information in the SIBX. Step 202: The UE starts a timer T3XX having a configured validity period, for example a value set to ntnUlSyncValidityDuration. Step 203: When T3XX expires, the UE begins to acquire the SIBX. For example, the UE may acquire the MIB and / or SIB1 to obtain scheduling information of the SIBX, and acquire the SIBX based on the scheduling information.

[0059] FIG. 3 is a block diagram of the present disclosure. Some embodiments 1 shows a schematic diagram of a procedure according to the method of the present invention. In this embodiment, the modification / update of the uplink synchronization assistance information is indicated by the validity period of the uplink synchronization assistance information. Specifically, steps 301 and 302 are similar to steps 201 and 202, and are not shown in this specification for the sake of brevity. Step 303: The UE is provided with searchSpaceSIB1 and searchSpaceOtherSystemInformation on the active BWP or initial BWP. Upon expiration of the timer T3XX, if the broadcast status of the SIBX is set to broadcasting, the UE immediately reacquires SIB1 and the updated SIBX via the system information (message).

[0060] FIG. 4 is a block diagram of the present disclosure. Some embodiments 1 shows a schematic diagram of a procedure according to the method of the present invention. In this embodiment, the modification / update of the uplink synchronization assistance information is indicated by the validity period of the uplink synchronization assistance information. Specifically, steps 401 and 402 are similar to steps 201 and 202, and are not shown in this specification for the sake of brevity. Step 403: The UE is provided with searchSpaceSIB1 and searchSpaceOtherSystemInformation on the active BWP or initial BWP. Upon expiration of the timer T3XX, the UE starts to acquire SIB1 to check the scheduling information of SIBX. If the broadcast status of SIBX is set to notbroadcasting, the UE starts to initiate a system information request via Msg1 or RRCSystemInfoRequest or DedicatedSIBRequest message and starts to acquire system information (messages) including SIBX.

[0061] FIG. 5 is a block diagram of the present disclosure. Some embodiments 1 shows a schematic diagram of a procedure according to the method of the present invention. In this embodiment, the modification / update of the uplink synchronization assistance information is indicated by the validity period of the uplink synchronization assistance information. Specifically, steps 501 and 502 are similar to steps 201 and 202, and are not shown in this specification for the sake of brevity.

[0062] In the embodiment shown in FIG. 5, the UE may be provided with searchSpaceSIB1 and not with searchSpaceOtherSystemInformation on the active BWP. Under such conditions, upon expiration of timer T3XX, the UE starts to obtain SIB1 to check the scheduling information of SIBX. If the broadcast status of SIBX is set to notbroadcasting, the UE shall notify the UE via Msg1 or RRCSystemInfoRequest or DedicatedSIBRequest message. System Information Initiate a request to obtain an updated SIBX provided via RRCReconfiguration message → dedicatedSystemInformationDelivery → sequential / consecutive transmission of SIBX.

[0063] In the embodiment shown in Figure 5, the UE may not be provided with searchSpaceSIB1 or searchSpaceOtherSystemInformation on the active BWP. In this embodiment, upon expiry of timer T3XX, the UE starts to obtain SIB1 in sequential / continuous transmission of RRCReconfiguration message->dedicatedSIB1-delivery to check the scheduling information of SIBX. If the broadcast status of SIBX is set to notbroadcasting, the UE initiates a system information request via Msg1 or RRCSystemInfoRequest or DedicatedSIBRequest message and obtains the provided updated SIBX via sequential / continuous transmission of RRCReconfiguration message->dedicatedSystemInformationDelivery->SIBX.

[0064] FIG. 6 is a block diagram of the present disclosure. Some embodiments6 shows an overview of a procedure according to the method of the present invention. In this embodiment, the short message may be implemented as Table 3 or Table 4. In FIG. 6, the UE obtains system information broadcasted from the NW, and the system information includes a SIBX including uplink synchronization assistance information and / or some other NTN-specific parameters. The SIBX may be an NTN-specific SIB including uplink synchronization assistance information and / or some other NTN-specific parameters, or a SIB including existing uplink synchronization assistance information and / or some other NTN-specific parameters (step 601).

[0065] In step 602, the UE receives a short message (e.g., via a paging procedure), and a bit uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification (e.g., an indication bit) in the received short message is set to "1". Based on the bit uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification, the UE immediately starts to acquire an updated SIBX. For example, the UE may acquire SIB1 to obtain scheduling information of the SIBX, and acquire the SIBX based on the acquired scheduling information.

[0066] FIG. 7 is a block diagram of the present disclosure. Some embodiments 7 shows a schematic diagram of a procedure according to ntnsysteminfomodification. In FIG. 7, the modification / update of the uplink synchronization assistance information and / or other NTN-specific parameters may be indicated by the validity period of the uplink synchronization assistance information and an indication bit (in the short message). For example, the short message may be implemented as Table 3 or Table 4, and the indication bit may be a bit uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification. Specifically, the procedure shown in FIG. 7 includes: Step 701: The UE obtains system information broadcasted from the NW, and the system information includes a SIBX including uplink synchronization assistance information and / or other NTN-specific parameters. The SIBX may be an NTN-specific SIB including uplink synchronization assistance information and / or other NTN-specific parameters, or a SIB including existing uplink synchronization assistance information and / or other NTN-specific parameters. In this embodiment, a validity time, for example, ntnUlSyncValidityDuration, is also provided as the validity period of the uplink synchronization assistance information or all information included in the SIBX. Step 702: The UE starts a timer T3XX having a configured validity duration, for example a value set to ntnUlSyncValidityDuration. Step 703: Before the timer T3XX expires, the UE receives a short message via paging, and uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification in the short message is set to '1'. Step 704: In response to the received short message, the UE stops the timer T3XX and immediately starts acquiring SIBX. For example, the UE may acquire SIB1 to obtain the scheduling information of SIBX, and acquire SIBX accordingly. Step 705: If a new validity period is provided in the updated SIBX, the UE starts a timer T3XX with a value set to this new period.

[0067] FIG. 8 is a block diagram of the present disclosure. Some embodiments8 shows a schematic diagram of a procedure according to ntnsysteminfomodification. In FIG. 8, the modification / update of the uplink synchronization assistance information and / or other NTN-specific parameters may be indicated by the validity period of the uplink synchronization assistance information and an indication bit (in the short message). For example, the short message may be implemented as Table 3 or Table 4, and the indication bit may be a bit uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification. Specifically, the procedure shown in FIG. 8 includes: Step 801: The UE obtains system information broadcast from the NW. The system information includes a SIBX including uplink synchronization assistance information and / or other NTN-specific parameters. The SIBX may be an NTN-specific SIB including uplink synchronization assistance information and / or other NTN-specific parameters. In this embodiment, a validity period, for example, ntnUlSyncValidityDuration, is also provided as the validity period of the uplink synchronization assistance information or all information in the SIBX. Step 802: The UE starts a timer T3XX having a configured validity duration, for example a value set to ntnUlSyncValidityDuration. Step 803: Before the timer T3XX expires, the UE receives a short message via paging, and a bit uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification in the short message is set to '1'. Step 804: The UE stops the timer T3XX and immediately starts acquiring SIBX. For example, the UE may acquire SIB1 to obtain the scheduling information of SIBX, and acquire SIBX accordingly. In this embodiment, no validity period is provided in the updated SIBX, and the UE does not start the timer T3XX again.

[0068] FIG. 9 is a block diagram of the present disclosure. Some embodiments9 shows a schematic diagram of a procedure according to . In FIG. 9, the modification / update of the uplink synchronization assistance information and / or other NTN-specific parameters may be indicated by a value tag. Specifically, the procedure shown in FIG. 9 includes: Step 901: The UE obtains system information broadcasted from the NW, and the system information includes a SIBX including uplink synchronization assistance information and / or other NTN-specific parameters. The SIBX may be a NTN-specific SIB including uplink synchronization assistance information and / or other NTN-specific parameters, or a SIB including existing uplink synchronization assistance information and / or other NTN-specific parameters. In this embodiment, a value tag is provided in SIB1 to identify whether the SIBX has been updated. Step 902: The UE receives a short message via paging. The systemInfoModification in the short message is set to "1", indicating that the system information has been updated. The UE starts to acquire SIB1 to check the value tag associated with SIBX. If the value tag is updated, the UE starts to acquire SIBX from the next modification period.

[0069] FIG. 10 is a block diagram of the present disclosure. Some embodiments 10 shows a schematic diagram of a procedure according to the method described above. In FIG. 10, the modification / update of the uplink synchronization assistance information and / or other NTN-specific parameters may be indicated by a validity period and a value tag. Specifically, the procedure shown in FIG. 10 includes the following: Step 1001: The UE obtains system information broadcast from the NW. The system information includes a SIBX including uplink synchronization assistance information and / or other NTN-specific parameters. The SIBX may be a NTN-specific SIB or an existing SIB. In this embodiment, a validity period, for example, ntnUlSyncValidityDuration, is provided as the validity period of the uplink synchronization assistance information or all information in the SIBX. Step 1002: The UE starts a timer T3XX having a configured validity duration, for example a value set to ntnUlSyncValidityDuration. Step 1003: Before the timer T3XX expires, the UE receives a short message via paging, and systemInfoModification in the short message is set to '1'. Step 1004: The UE obtains SIB1 from the next modification period, and checks the value tag associated with SIBX. Step 1005: If the value tag associated with SIBX indicates that SIBX is updated (eg, the value tag changes / updated), the UE stops timer T3XX and starts to acquire SIBX according to the scheduling information in SIB1. Step 1006: If a new validity period is provided in the updated SIBX, the UE starts a timer T3XX with a value set to this new period.

[0070] FIG. 11 is a block diagram of the present disclosure. Some embodiments 11 shows a schematic diagram of a procedure according to the method described above. In FIG. 11, the modification / update of the uplink synchronization assistance information and / or other NTN-specific parameters may be indicated by a validity period and a value tag. Specifically, the procedure shown in FIG. 11 includes the following: Step 1101: The UE obtains system information broadcast from the NW. The system information includes a SIBX including uplink synchronization assistance information and / or other NTN-specific parameters. The SIBX may be a NTN-specific SIB or an existing SIB. In this embodiment, a validity period, for example, ntnUlSyncValidityDuration, is provided as the validity period of the uplink synchronization assistance information or all information in the SIBX. Step 1102: The UE starts a timer T3XX having a configured validity duration, for example a value set to ntnUlSyncValidityDuration. Step 1103: Before the timer T3XX expires, the UE receives a short message via paging, and systemInfoModification in the short message is set to '1'. Step 1104: The UE obtains SIB1 from the next modification period, and checks the value tag associated with SIBX. Step 1105: The value tag associated with SIBX indicates that SIBX is updated (e.g., the value tag changes / updates), and the UE stops the timer T3XX and starts to acquire SIBX according to the scheduling information in SIB1. In this embodiment, no validity period is provided in the updated SIBX, and the UE does not start the timer T3XX again.

[0071] The present disclosure Some embodiments Then, the UE receives an indication indicating that the NTN / HAPS-specific uplink synchronization assistance information or system information has been updated, and obtains the updated NTN / HAPS-specific uplink synchronization assistance information or system information.

[0072] In this embodiment, the uplink synchronization assistance information includes one or more of the following parameters: a network controlled common TA, a drift rate of the common TA, a variation of the common TA drift rate, an x ​​coordinate of a serving satellite position state vector in the ECEF, a y coordinate of a serving satellite position state vector in the ECEF, a z coordinate of a serving satellite position state vector in the ECEF, an x ​​coordinate of a serving satellite velocity state vector in the ECEF, a y coordinate of a serving satellite velocity state vector in the ECEF, a z coordinate of a serving satellite velocity state vector in the ECEF, a semi-major axis α of the serving satellite, an eccentricity of the serving satellite, an anomaly argument ω of the serving satellite, a node longitude Ω of the serving satellite, an inclination i of the serving satellite, a mean anomaly angle M [rad] at an epoch time of the serving satellite, a validity period configured by the network for the uplink synchronization assistance information, an epoch time of the assistance information, polarization information of downlink transmissions on the serving link, polarization information of the uplink serving link, a reference position of the serving cell, time information indicating when the cell is going to stop serving the area covered by the cell, and an indication of terminal specific TA reporting.

[0073] In this embodiment, the indication that the NTN / HAPS specific uplink synchronization assistance information and / or system information has been updated may be the validity period of the NTN / HAPS specific uplink synchronization assistance information and / or system information, such information being considered to have been updated when the period has elapsed.

[0074] Alternatively or additionally, the indication that the NTN / HAPS dedicated uplink synchronization assistance information and / or system information has been updated may be indicated by an update of a value tag configured for a SIB containing the NTN / HAPS dedicated uplink synchronization assistance information and / or system information. For example, the value tag may be configured / introduced within a SIB containing scheduling information for a SIB containing the NTN / HAPS dedicated uplink synchronization assistance information and / or system information.

[0075] Alternatively or additionally, the indication that the NTN / HAPS dedicated uplink synchronization assistance information and / or system information has been updated may comprise a single bit indication in a short message or paging DCI, such bit indication indicating a modification of the SIB containing the NTN / HAPS dedicated uplink synchronization assistance information and / or system information.

[0076] The UE may obtain the updated uplink synchronization support information and / or system information dedicated to the NTN / HAPS via the BCCH or an RRCReconfiguration message (according to the scheduling information of the SIB including the updated uplink synchronization support information and / or system information dedicated to the NTN / HAPS).

[0077] FIG. 12 is a block diagram of the present disclosure. Some embodiments1 is a schematic diagram of a wireless terminal 120 according to the present invention. The wireless terminal 120 may be a user equipment (UE), a mobile phone, a laptop, a tablet computer, an e-book, or a portable computer system, and is not limited herein. The wireless terminal 120 may include a processor 1200, such as a microprocessor or an application specific integrated circuit (ASIC), a storage unit 1210, and a communication unit 1220. The storage unit 1210 may be any data storage device that stores program code 1212, which is accessed and executed by the processor 1200. The storage unit 121 0 The embodiments of the include, but are not limited to, a subscriber identity module (SIM), a read only memory (ROM), a flash memory, a random access memory (RAM), a hard disk, and an optical data storage device. The communication unit 1220 may be a transceiver and is used to transmit and receive signals (e.g., messages or packets) according to the processing results of the processor 1200. Some embodiments 12, the communication unit 1220 transmits and receives signals via at least one antenna 1222 shown in FIG.

[0078] Some embodiments In this embodiment, the memory unit 1210 and the program code 1212 may be omitted, and the processor 1200 may include a memory unit having the program code stored therein.

[0079] Processor 1200 may, for example, execute program code 1212 to perform any one of the steps in the illustrated embodiments on wireless terminal 120 .

[0080] The communication unit 1220 may be a transceiver. Alternatively or additionally, the communication unit 1220 may combine a transmitting unit and a receiving unit configured to transmit and receive, respectively, signals to and from a wireless network node (e.g., a base station).

[0081] FIG. 13 is a block diagram of the present disclosure. Some embodiments FIG. 1 is a schematic diagram of a radio network node 130 according to the present invention. The radio network node 130 may be a satellite, a base station (BS), a network entity, a mobility management entity (MME), a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), a radio access network (RAN) node, a next generation RAN (NG-RAN) node, a gNB, an eNB, a gNB central unit (gNB-CU), a gNB distributed unit (gNB-DU), a data network, a core network, or a radio network controller (RNC), and is not limited thereto herein. In addition, the radio network node 130 may be an access and mobility management function (AMF), a session management function (SMF), a user player function (PLAY function), a user group function (UE function), a user group management function (WAN ... hmm The radio network node 130 may include (perform) at least one network function, such as a Unified Function (UPF), a Policy Control Function (PCF), an Application Function (AF), etc. The radio network node 130 may include a processor 1300, such as a microprocessor or an ASIC, a storage unit 1310, and a communication unit 1320. The storage unit 1310 may be any data storage device that stores program code 1312, which is accessed and executed by the processor 1300. The storage unit 131 0 Examples of include, but are not limited to, a SIM, a ROM, a flash memory, a RAM, a hard disk, and an optical data storage device. The communication unit 1320 may be a transceiver and is used to transmit and receive signals (e.g., messages or packets) according to the processing results of the processor 1300. In one example, the communication unit 1320 transmits and receives signals via at least one antenna 1322 shown in FIG. 13.

[0082] Some embodiments In this embodiment, the memory unit 1310 and the program code 1312 may be omitted. The processor 1300 may include a memory unit having program code stored therein.

[0083] The processor 1300 may perform any of the steps described in the illustrated embodiment on the radio network node 130, for example by executing the program code 1312.

[0084] The communication unit 1320 may be a transceiver. Alternatively or additionally, the communication unit 1320 may combine a transmitting unit and a receiving unit configured to transmit and receive, respectively, signals to and from a wireless terminal (e.g., user equipment or another wireless network node).

[0085] The present disclosure also proposes a communication system comprising at least one wireless terminal and at least one radio network node. The wireless terminal is any one of those described above and performs any one of the wireless communication methods used with the wireless terminal of the present disclosure. The radio network node is any one of those described above and performs any of the wireless communication methods for the radio network node of the present disclosure. In some embodiments, the communication system is as shown in Figure 1, where the radio network node is denoted as NW and the wireless terminal is denoted as UE.

[0086] In an embodiment of the communication system of the present disclosure, a wireless terminal receives an update instruction associated with system information. Based on the update instruction, the wireless terminal acquires the system information (e.g., acquires an SIB including the system information). As a result, the wireless terminal is able to acquire updated system information in a timely manner and perform communication based on the updated system information.

[0087] FIG. 14 is a schematic diagram of the present disclosure. Some embodiments 14 shows a flowchart of a method according to the present invention. The method shown in FIG. 14 may be used in a wireless terminal (eg, a UE) and includes the following steps. Step 1401: Receive an update instruction associated with system information of an NTN from a radio network node. Step 1402: System information is obtained based on the update instruction.

[0088] In the embodiment shown in FIG. 14, the wireless terminal receives an update instruction associated with system information of an NTN (e.g., HAPS(system), HIBS(system)). Based on the update instruction, the wireless terminal acquires the system information (e.g., acquires an SIB including the system information). As a result, the wireless terminal is able to acquire the updated system information in a timely manner and perform communication based on the updated system information.

[0089] Some embodiments Here, the system information includes NTN-specific uplink synchronization assistance information and / or system information (eg, NTN / HAPS (system)-specific parameters).

[0090] Some embodimentsin which the system information includes at least one of: a common TA, a drift rate of the common TA, a variation of the drift rate of the common TA, an x-coordinate of a serving node position state vector in the ECEF coordinate system, a y-coordinate of a serving node position state vector in the ECEF coordinate system, a z-coordinate of a serving node position state vector in the ECEF coordinate system, an x-coordinate of a serving node velocity state vector in the ECEF coordinate system, a y-coordinate of a serving node velocity state vector in the ECEF coordinate system, a z-coordinate of a serving node velocity state vector in the ECEF coordinate system, a semi-major axis of the serving node, an eccentricity of the serving node, an anomaly argument of the serving node, a nodal longitude of the serving node, an inclination of the serving node, a mean anomaly angle in an epoch time of the serving node, a validity period of the system information, an epoch time of the system information, polarization information of downlink transmissions on the serving link, polarization information of uplink serving link, a reference position of the serving cell, time information indicative of when the cell is about to stop serving an area covered by the cell, or an indication of a terminal specific TA reporting. In addition, the serving node of the NTN may be a satellite, HAPS, HIBS, airplane, or UAV.

[0091] Some embodiments In the embodiment, the update indication includes / indicates a validity period of the system information. In this embodiment, the wireless terminal acquires the system information when or after the validity period has elapsed. That is, the wireless terminal starts acquiring the system information when the validity period has elapsed. For example, the wireless terminal may start a timer when it receives the system information and the update indication, and the value of the timer is set to the validity period. When the timer expires, the wireless terminal starts acquiring the system information.

[0092] Some embodimentsIn the embodiment, the update indication includes a value tag. In this embodiment, the wireless terminal may receive an indication bit set to indicate a BCCH modification (e.g., systemInfoModification in the short message set to 1). Based on the indication bit, the wireless terminal acquires the system information when the value tag is updated. For example, the value tag may be introduced in an existing SIB1 or a new SIB1 including the scheduling information of the SIB including the system information. It should be noted that the value tag is configured / introduced for the SIB including the system information. In response to the indication bit, the wireless terminal acquires / receives the SIB1 including the value tag. If the value tag is updated, the wireless terminal acquires the SIB including the system information (including the SIB) based on the scheduling information included in the acquired / received SIB1.

[0093] Some embodiments In, the maximum value of the value tag is greater than 31 so that system information can be updated as frequently as necessary.

[0094] Some embodiments In the embodiment, the update indication includes a newly introduced indication bit. The indication bit is introduced / used to indicate a modification of the system information (e.g., NTN-specific uplink synchronization assistance information or system information). In this embodiment, when or after receiving an indication bit (indication bit set to 1) indicating a modification / update of the system information, the wireless terminal acquires or starts acquiring the system information.

[0095] Some embodiments In this case, the indication bit is included / introduced in a short message (eg, uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification in a short message) or in a paging DCI.

[0096] It should be noted that the update indication may include at least one of a validity period, a value tag, and / or an indication bit. For example, the wireless terminal may first receive the validity period of the system information. During this validity period, the wireless terminal may receive a short message including an indication bit indicating a modification / update of the system information. Under such conditions, the wireless terminal may start acquiring the system information immediately after receiving the short message. Further examples can be found in Figures 7, 8, 10, and 11.

[0097] Some embodiments In the , the wireless terminal acquires system information via the BCCH or an RRC message.

[0098] FIG. 15 is a schematic diagram of the present disclosure. Some embodiments 15 shows a flowchart of a method according to the present invention. The method shown in FIG. 15 may be used in a radio network node (e.g., a RAN node, a relay), and includes the following steps: Step 1501: Send an update instruction associated with system information of the NTN to the wireless terminal. Step 1502: Transmit system information to the wireless terminal.

[0099] In Figure 15, the radio network node transmits an update indication associated with system information of the NTN (e.g., HAPS(system), HIBS(system)) to the radio terminal (e.g., UE) to indicate the modification / update of the system information and / or to instruct the radio terminal to acquire the system information (e.g., to acquire a SIB including the system information). The radio network node transmits the updated / modified system information to the radio terminal, e.g., via a BCCH or an RRC message.

[0100] Some embodiments Here, the system information includes NTN-specific uplink synchronization assistance information and / or system information (eg, NTN / HAPS (system)-specific parameters).

[0101] Some embodimentsin which the system information includes at least one of: a common TA, a drift rate of the common TA, a variation of the drift rate of the common TA, an x-coordinate of a serving node position state vector in the ECEF coordinate system, a y-coordinate of a serving node position state vector in the ECEF coordinate system, a z-coordinate of a serving node position state vector in the ECEF coordinate system, an x-coordinate of a serving node velocity state vector in the ECEF coordinate system, a y-coordinate of a serving node velocity state vector in the ECEF coordinate system, a z-coordinate of a serving node velocity state vector in the ECEF coordinate system, a semi-major axis of the serving node, an eccentricity of the serving node, an anomaly argument of the serving node, a nodal longitude of the serving node, an inclination of the serving node, a mean anomaly angle in an epoch time of the serving node, a validity period of the system information, an epoch time of the system information, polarization information of downlink transmissions on the serving link, or polarization information of the uplink serving link, a reference position of the serving cell, time information indicative of when the cell is about to stop serving an area covered by the cell, or an indication of a terminal specific TA report. In addition, the serving node of the NTN may be a satellite, HAPS, HIBS, airplane, or UAV.

[0102] Some embodiments In the embodiment, the update indication includes / indicates the validity period of the system information. In this embodiment, the radio network node transmits the system information when or after the validity period has elapsed.

[0103] Some embodimentsIn the embodiment, the update indication includes a value tag. For example, the value tag may be introduced in an existing SIB1 or a new SIB1 including the scheduling information of the SIB including the system information. It should be noted that the value tag is configured / introduced for the SIB including the system information. In this embodiment, when the system information is modified / updated (needs to be modified / updated), the radio network node transmits an indication bit indicating the modification in the BCCH (e.g., systemInfoModification in the short message set to 1) to the wireless terminal and updates / changes the value tag. In response to the indication bit, the wireless terminal obtains the SIB1 including the updated value tag. Due to the update of the value tag, the wireless terminal (starts to obtain) the SIB including the system information based on the scheduling information of the obtained SIB1.

[0104] Some embodiments In, the maximum value of the value tag is greater than 31 so that system information can be updated as frequently as necessary.

[0105] Some embodiments In the embodiment, the update indication includes a newly introduced indication bit. The indication bit is introduced / used to indicate a modification of the system information (e.g., NTN-specific uplink synchronization assistance information or system information). In this embodiment, when or after the system information is modified or updated, the radio network node transmits an indication bit (e.g., an indication bit set to 1) indicating the modification / update of the system information to the wireless terminal. Based on the indication bit, the wireless terminal starts to acquire the system information.

[0106] Some embodiments In this case, the indication bit is included / introduced in a short message (eg, uplinkSyncAssistanceInfoIndication or ntnsystemInfoModification in a short message) or in a paging DCI.

[0107] It should be noted that the update indication may include at least one of a validity period, a value tag, and / or an indication bit (see the embodiments shown in Figures 2 to 11).

[0108] Although various embodiments of the present disclosure have been described above, it should be understood that they are presented only as examples and not as limitations. Similarly, various diagrams may depict exemplary architectures or configurations, which are provided to enable those skilled in the art to understand exemplary features and functions of the present disclosure. However, such a person will understand that the present disclosure is not limited to the exemplary architectures or configurations shown, but can be implemented using various alternative architectures and configurations. In addition, as will be understood by those skilled in the art, one or more features of one embodiment can be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the exemplary embodiments described above.

[0109] It is also understood that any reference to elements herein using a designation such as "first," "second," etc., does not generally limit the number or order of those elements. Rather, these designations may be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0110] Additionally, those skilled in the art will appreciate that information and signals may be represented using any one of a variety of different technologies and techniques, e.g., data, instructions, commands, information, signals, bits, and symbols that may be referenced in the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0111] Those skilled in the art will further appreciate that any one of the various illustrative logical blocks, units, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented by software hardware (e.g., digital implementations, analog implementations, or a combination of the two), firmware, various forms of programs or design code incorporating instructions (which may be referred to herein for convenience as "software" or "software units"), or any combination of these techniques.

[0112] To clearly illustrate this interchangeability of hardware, firmware, and software, various example components, blocks, units, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these techniques, depends on the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in various ways for each particular application, and such implementation decisions do not result in a departure from the scope of the present disclosure. According to various embodiments, a processor, device, component, circuit, structure, machine, unit, etc. may be configured to perform one or more of the functions described herein. The terms "configured to" or "configured for" as used herein with respect to a specified operation or function refer to a processor, device, component, circuit, structure, machine, unit, etc. that is physically constructed, programmed, and / or arranged to perform the specified operation or function.

[0113] Furthermore, those skilled in the art will appreciate that the various exemplary logical blocks, units, devices, components, and circuits described herein may be implemented in or performed by an integrated circuit (IC), which may include a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, or any combination thereof. The logical blocks, units, and circuits may further include an antenna and / or a transceiver for communicating with various components in a network or device. The general purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other suitable configuration for performing the functions described herein. If implemented in software, the functions may be stored as one or more instructions or codes on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein may be implemented as software stored on a computer-readable medium.

[0114] Computer-readable media includes both computer storage media and communication media, including any medium that can be enabled to transfer a computer program or code from one place to another. Storage media can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

[0115] In this document, the term "unit" as used herein refers to software, firmware, hardware, and any combination of these elements for performing the relevant functions described herein. In addition, for purposes of explanation, various units are described as separate units. However, as will be apparent to those skilled in the art, two or more units may be combined to form a single unit that performs the relevant functions according to embodiments of the present disclosure.

[0116] In addition, memory or other storage, as well as communication components, may be employed in embodiments of the present disclosure. For clarity, it will be apparent that the above description has described embodiments of the present disclosure with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements, or domains may be used without detracting from the present disclosure. For example, functions shown to be performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Thus, references to specific functional units do not indicate a strict logical or physical structure or organization, but merely to suitable means for providing the described functionality.

[0117] Various modifications to the implementations described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other implementations without departing from the scope of the claims. Thus, the present disclosure is not intended to be limited to the implementations shown in this specification, but should be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. 1. A wireless communication method for use in a wireless terminal, the method comprising: receiving an update instruction associated with system information of a non-terrestrial network from a radio network node; acquiring the system information based on the update instruction; A wireless communication method comprising:

2. The system information includes: Common Timing Advance, TA, the drift rate of the common TA; Variation in the drift rate of the common TA; the x-coordinate of the serving node position state vector in the Earth-centered, Earth-fixed ECEF coordinate system; the y coordinate of the serving node position state vector in the ECEF coordinate system; the z coordinate of the serving node position state vector in the ECEF coordinate system; the x-coordinate of the serving node velocity state vector in the ECEF coordinate system; the y coordinate of the serving node velocity state vector in the ECEF coordinate system; the z coordinate of the serving node velocity state vector in the ECEF coordinate system; the semi-major axis of the serving node, the eccentricity of the serving node; the near point argument of the serving node; the node longitude of said serving node; the tilt of the serving node; the mean anomaly at epoch time of the serving node; The validity period of the system information; an epoch time of the system information; Polarization information of the downlink transmission on the service link; Polarization information of the uplink service link; the reference position of the serving cell, time information indicating when a cell is going to cease serving the area covered by said cell; or Terminal-specific TA reporting instructions The wireless communication method of claim 1 , comprising at least one of:

3. The step of acquiring the system information based on the update instruction includes: acquiring the system information when a validity period indicated by the update instruction has elapsed; 3. The wireless communication method according to claim 1, further comprising:

4. receiving an indication bit from the radio network node configured to indicate a modification of a broadcast channel; Further comprising: The step of acquiring the system information based on the update instruction includes: acquiring the system information when a value tag included in the update instruction is updated; The wireless communication method according to claim 1 , comprising:

5. The wireless communication method of claim 4 , wherein the maximum value of the value tag is greater than 31.

6. The method of claim 4 or 5, wherein the value tag is configured for a system information block that contains the system information.

7. The step of acquiring the system information based on the update instruction includes: obtaining the system information when an indication bit included in the update indication indicates that the system information has been updated; The wireless communication method according to claim 1 , comprising:

8. The wireless communication method of claim 7 , wherein the instruction bit is in a short message or a page downlink control information.

9. The method of claim 1 , wherein the system information is obtained via a broadcast channel or a radio resource control message.

10. The wireless communication method according to claim 1 , wherein the system information includes at least one of uplink synchronization assistance information or system information dedicated to the non-terrestrial network.

11. 1. A wireless communication method for use in a radio network node, the method comprising: transmitting, to the wireless terminal, an update instruction associated with system information of the non-terrestrial network; transmitting the system information to the wireless terminal; A wireless communication method comprising:

12. The system information includes: Common Timing Advance, TA, the drift rate of the common TA; Variation in the drift rate of the common TA; the x-coordinate of the serving node position state vector in the Earth-centered, Earth-fixed ECEF coordinate system; the y coordinate of the serving node position state vector in the ECEF coordinate system; the z coordinate of the serving node position state vector in the ECEF coordinate system; the x-coordinate of the serving node velocity state vector in the ECEF coordinate system; the y coordinate of the serving node velocity state vector in the ECEF coordinate system; the z coordinate of the serving node velocity state vector in the ECEF coordinate system; the semi-major axis of the serving node, the eccentricity of the serving node; the near point argument of the serving node; the node longitude of said serving node; the tilt of the serving node; the mean anomaly at epoch time of the serving node; The validity period of the system information; an epoch time of the system information; Polarization information of the downlink transmission on the service link, or Polarization information of the uplink service link; the reference position of the serving cell, time information indicating when a cell is going to cease serving the area covered by said cell; or Terminal-specific TA reporting instructions The wireless communication method of claim 11, comprising at least one of:

13. The wireless communication method according to claim 11 or 12, wherein the update instruction includes a validity period of the system information.

14. The update instruction includes a value tag to be updated; The method comprises: transmitting to said wireless terminal an indication bit set to indicate a modification of a broadcast channel. The wireless communication method according to claim 11 , further comprising:

15. The wireless communication method of claim 14 , wherein the maximum valid tag value is greater than 31.

16. The method of claim 14 or 15, wherein the value tag is configured for a system information block that contains the system information.

17. The method of claim 11 , wherein the update indication includes an indication bit set to indicate that the system information has been updated.

18. The wireless communication method of claim 17, wherein the instruction bit is in a short message or page downlink control information.

19. The method of wireless communication according to any one of claims 11 to 18, wherein the system information is transmitted via a broadcast channel or a radio resource control message.

20. The wireless communication method according to claim 11 , wherein the system information includes at least one of uplink synchronization assistance information or system information dedicated to the non-terrestrial network.

21. A wireless terminal, a communication unit configured to receive an update instruction associated with system information of a non-terrestrial based network from a radio network node; a processor configured to obtain the system information based on the update instruction; A wireless terminal comprising:

22. The wireless terminal of claim 21 , wherein the processor is further configured to perform a wireless communication method as claimed in any one of claims 2 to 10.

23. 1. A radio network node, comprising: Transmitting an update instruction associated with system information of the non-terrestrial network to the wireless terminal; transmitting the system information to the wireless terminal; A communication unit configured as follows: A wireless network node comprising:

24. 24. A radio network node according to claim 23, further comprising a processor configured to perform a wireless communication method according to any one of claims 12 to 20.

25. 26. A computer program product having stored thereon a computer readable program medium code which, when executed by a processor, causes the processor to implement a wireless communication method according to any one of claims 1 to 25.

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