Method, apparatus, communication device and storage medium for reselecting a cell

Abstract

The method for reselecting a cell provided in the embodiments of the present disclosure is executed by a terminal, and the method comprises the following steps: determining whether to perform a cell reselection operation based on a positional relationship between the terminal and a source cell; wherein the cell is a cell covered by a signal of a satellite.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of wireless communication technology, and particularly to a method, apparatus, communication device, and storage medium for cell reselection. Background Technology

[0002] In non-terrestrial network (NTN) scenarios, due to the rapid changes in the satellite's position relative to the ground, in some cases, the terminal may only be continuously covered by the signal of the same satellite for a few minutes to a dozen minutes. Therefore, the terminal needs to constantly perform cell reselection.

[0003] In related technologies, if a terminal performs measurements, makes decisions, and executes cell reselection procedures on neighboring cells according to the cell reselection process of the terrestrial network, in NTN scenarios, due to the relatively insignificant near-field effect, the Reference Signal Receiving Power (RSRP) values ​​measured at the cell center and cell edge do not change much. This will severely affect the decision-making process regarding whether to execute cell reselection, thereby impacting the terminal's mobility performance in idle state. Summary of the Invention

[0004] This disclosure presents a method, apparatus, communication device, and storage medium for cell reselection.

[0005] According to a first aspect of the present disclosure, a method for cell reselection is provided, wherein the method is executed by a terminal, the method comprising:

[0006] Based on the location relationship between the terminal and the source cell, determine whether to perform a cell reselection operation;

[0007] The cell in question is one within the satellite's signal coverage area.

[0008] In one embodiment, determining whether to perform cell reselection based on the location relationship between the terminal and the source cell includes:

[0009] Based on the positional relationship between the terminal and the reference position of the source cell, determine whether to perform a cell reselection operation;

[0010] The reference position remains unchanged relative to the source cell.

[0011] In one embodiment, determining whether to perform a cell reselection operation based on the positional relationship between the terminal and the reference location of the source cell includes:

[0012] In response to the distance between the terminal and the reference location being outside a threshold range, it is determined that cell reselection will be performed.

[0013] or,

[0014] If the distance between the terminal and the reference location is within a threshold range, it is determined that cell reselection will not be performed.

[0015] In one embodiment, the method further includes:

[0016] The threshold range is determined based on the size of the satellite's signal coverage area.

[0017] In one embodiment, determining to perform cell reselection in response to the distance between the terminal and the reference location being outside a threshold range includes:

[0018] In response to the fact that the first distance between the terminal and the reference location at a first moment is outside a threshold range and the first distance is greater than a second distance, it is determined to perform cell reselection;

[0019] Wherein, the second distance is the distance between the terminal and the reference position at the second moment; the second moment precedes the first moment.

[0020] In one embodiment, the method further includes:

[0021] Receive ephemeris information sent by the base station;

[0022] The location of the reference position is determined based on the ephemeris information.

[0023] In one embodiment, the reference location is a location determined based on the center location of the source cell; wherein the center location of the source cell is determined based on the ephemeris information.

[0024] In one embodiment, the method further includes:

[0025] Receive the cell configuration information of the target cell for cell reselection.

[0026] In one embodiment, the cell configuration information includes one or more of the following:

[0027] Frequency information of the target cell;

[0028] Community identification ID information;

[0029] The measurement time configuration (SMTC) information for the synchronization signal block;

[0030] Subcarrier spacing information.

[0031] According to a second aspect of the present disclosure, an apparatus for cell reselection is provided, wherein the apparatus is applied to a terminal, the apparatus including a determining module; wherein...

[0032] The determining module is configured to: determine whether to perform a cell reselection operation based on the location relationship between the terminal and the source cell; wherein, the cell is a cell covered by satellite signals.

[0033] According to a third aspect of the present disclosure, a communication device is provided, the communication device comprising:

[0034] processor;

[0035] Memory used to store the processor's executable instructions;

[0036] The processor is configured to implement the method described in any embodiment of this disclosure when running the executable instructions.

[0037] According to a fourth aspect of the present disclosure, a computer storage medium is provided, the computer storage medium storing a computer executable program, which, when executed by a processor, implements the methods described in any embodiment of the present disclosure.

[0038] In this embodiment, the decision to perform cell reselection is based on the location relationship between the terminal and the source cell; wherein, the cell is a cell covered by satellite signals. Since the decision to perform cell reselection is based on the location relationship between the terminal and the source cell, only the location relationship between the terminal and the source cell needs to be obtained to determine whether to perform cell reselection. Compared to cell reselection based on reference signal received power, this method is more reliable, thus improving the terminal's mobility performance. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a wireless communication system.

[0040] Figure 2 This is a schematic diagram illustrating a satellite communication scenario according to an exemplary embodiment.

[0041] Figure 3 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0042] Figure 4 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0043] Figure 5 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0044] Figure 6 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0045] Figure 7 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0046] Figure 8 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0047] Figure 9 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0048] Figure 10 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0049] Figure 11 This is a flowchart illustrating a cell reselection method according to an exemplary embodiment.

[0050] Figure 12 This is a schematic diagram illustrating a cell reselection apparatus according to an exemplary embodiment.

[0051] Figure 13 This is a schematic diagram of the structure of a terminal according to an exemplary embodiment.

[0052] Figure 14 This is a block diagram illustrating a base station according to an exemplary embodiment. Detailed Implementation

[0053] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this disclosure as detailed in the appended claims.

[0054] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0055] It should be understood that although the terms first, second, third, etc., may be used to describe various information in embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of embodiments of this disclosure, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0056] For the sake of brevity and ease of understanding, the terms “greater than” or “less than” are used in this document to characterize size relationships. However, it will be understood by those skilled in the art that the term “greater than” also includes the meaning of “greater than or equal to”, and “less than” also includes the meaning of “less than or equal to”.

[0057] Please refer to Figure 1 This illustration shows a schematic diagram of the structure of a wireless communication system provided in an embodiment of this disclosure. Figure 1 As shown, the wireless communication system is a communication system based on mobile communication technology. The wireless communication system may include: several user equipment 110 and several base stations 120.

[0058] User equipment 110 can be a device that provides voice and / or data connectivity to a user. User equipment 110 can communicate with one or more core networks via a Radio Access Network (RAN). User equipment 110 can be an Internet of Things (IoT) user equipment, such as sensor devices, mobile phones, and computers with IoT user equipment capabilities. For example, it can be a fixed, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted device. Examples include a station (STA), subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, or user equipment. Alternatively, user equipment 110 can also be a device from an unmanned aerial vehicle (UAV). Alternatively, user equipment 110 can also be a vehicle-mounted device, such as a vehicle computer with wireless communication capabilities, or a wireless user equipment connected to an external vehicle computer. Alternatively, user equipment 110 can also be a roadside device, such as a street light, traffic light, or other roadside device with wireless communication capabilities.

[0059] Base station 120 can be a network-side device in a wireless communication system. This wireless communication system can be a fourth-generation mobile communication (4G) system, also known as a Long Term Evolution (LTE) system; or it can be a 5G system, also known as a New Radio (NR) system; or it can be the next generation after 5G. In this case, the access network in the 5G system can be called NG-RAN (New Generation-Radio Access Network).

[0060] The base station 120 can be an evolved NB (eNB) used in a 4G system. Alternatively, the base station 120 can also be a gNB (gNB) using a centralized-distributed architecture in a 5G system. When the base station 120 adopts a centralized-distributed architecture, it typically includes a central unit (CU) and at least two distributed units (DUs). The central unit is equipped with a protocol stack of the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Media Access Control (MAC) layer; the distributed units are equipped with a physical (PHY) layer protocol stack. This disclosure does not limit the specific implementation of the base station 120.

[0061] Base station 120 and user equipment 110 can establish a wireless connection via a wireless air interface. In different implementations, the wireless air interface is a wireless air interface based on the fourth-generation mobile communication network technology (4G) standard; or, the wireless air interface is a wireless air interface based on the fifth-generation mobile communication network technology (5G) standard, such as a new air interface; or, the wireless air interface can also be a wireless air interface based on a next-generation mobile communication network technology standard based on 5G.

[0062] In some embodiments, user equipment 110 can also establish E2E (End to End) connections. Examples include V2V (vehicle to vehicle), V2I (vehicle to Infrastructure), and V2P (vehicle to pedestrian) communication scenarios in vehicle-to-everything (V2X) communication.

[0063] Here, the user equipment mentioned above can be considered as the terminal equipment in the following embodiments.

[0064] In some embodiments, the wireless communication system described above may further include a network management device 130.

[0065] Several base stations 120 are connected to network management device 130. Network management device 130 can be a core network device in a wireless communication system, such as a Mobility Management Entity (MME) in an Evolved Packet Core (EPC). Alternatively, it can be other core network devices, such as a Serving Gateway (SGW), a Public Data Network Gateway (PGW), a Policy and Charging Rules Function (PCRF), or a Home Subscriber Server (HSS). The implementation of network management device 130 is not limited in this embodiment.

[0066] To facilitate understanding by those skilled in the art, this disclosure provides multiple embodiments to clearly illustrate the technical solutions of the embodiments of this disclosure. Of course, those skilled in the art will understand that the multiple embodiments provided in this disclosure can be executed individually, or in combination with the methods of other embodiments in this disclosure, or individually or in combination with some methods in other related technologies; this disclosure does not limit these aspects.

[0067] To better understand the technical solutions described in any embodiment of this disclosure, the relevant application scenarios of satellite communication will first be explained:

[0068] In wireless communication technology, satellite communication is considered an important aspect of future wireless communication technology development. Satellite communication refers to communication conducted by terrestrial radio communication equipment using satellites as relays. A satellite communication system consists of a satellite component and a ground component. The characteristics of satellite communication are: large communication range; communication can be conducted between any two points within the coverage area of ​​the satellite's emitted radio waves; it is less affected by land-based disasters and has high reliability.

[0069] Satellite communication, as a supplement to terrestrial communication systems, has the following characteristics: 1. Extended coverage: For areas where cellular communication systems cannot cover or where coverage costs are high, such as oceans, deserts, and remote mountainous areas, satellite communication can solve communication problems. 2. Emergency communication: In extreme situations such as disasters (e.g., earthquakes) that render cellular communication infrastructure unavailable, satellite communication can quickly establish communication connections. 3. Industry applications: For example, for latency-sensitive long-distance transmission services, satellite communication can reduce transmission latency.

[0070] Satellite communication can be communication between ground-based radio communication stations that uses a communication satellite as a relay station to relay radio waves. The communication functions of a communication satellite include at least one of the following: receiving signals, changing the frequency of signals, amplifying signals, relaying signals, and positioning.

[0071] In one embodiment, see Figure 2 The wireless communication network can be a network that integrates mobile communication networks and satellite communication networks. The mobile communication network includes a base station 21, and the satellite communication network includes a communication satellite 22 and a gateway station 23 for that communication satellite.

[0072] In one embodiment, base station 21 can establish a wireless communication connection with gateway station 23. Terminal 24 can establish a wireless communication connection with base station 21. Terminal 24 can establish a wireless communication connection with communication satellite 22.

[0073] like Figure 3 As shown, this embodiment provides a method for cell reselection, wherein the method is executed by a terminal, and the method includes:

[0074] Step 31: Based on the location relationship between the terminal and the source cell, determine whether to perform a cell reselection operation;

[0075] Among them, "cell" refers to the cell covered by satellite signals.

[0076] Here, the terminal can be, but is not limited to, mobile phones, wearable devices, vehicle terminals, roadside units (RSUs), smart home terminals, and industrial sensing devices.

[0077] Here, the terminal communicates with the base station via satellite.

[0078] Here, a base station can be an access device for a terminal to access the network. The base station can be of various types, such as a 3G network base station, a 4G network base station, a 5G network base station, or other evolved base stations. The satellite can be a low Earth Orbit (LEO) satellite. It should be noted that with the evolution of satellite wireless communication networks, the satellite can also be a medium Earth Orbit (MEO) satellite, etc.

[0079] In one embodiment, the satellite may be deployed in airspace where the density of ground base stations is less than a density threshold and the channel quality of the wireless communication environment is less than a quality threshold. For example, airspace in remote mountainous areas and / or ocean areas.

[0080] In one embodiment, see Figure 4 The satellites include Satellite 1 and Satellite 2; Satellite 1's cell is Cell 1, which is the source cell for the terminal; Satellite 2's cell is Cell 2, which is assumed to be the target cell for the terminal to perform cell reselection. The satellites move relative to the terminal. When the terminal moves to the edge of Cell 1, it needs to perform cell reselection, reselecting to Cell 2 and accessing and camping in Cell 2.

[0081] In one embodiment, the cell covered by the satellite signal is an NTN cell, and the source cell currently connected to by the terminal can be an NTN source cell. In another embodiment, the coverage area of ​​the NTN source cell can be the range of the ground area that the signal of the NTN source cell can cover. Here, one satellite can correspond to at least one NTN cell.

[0082] In one embodiment, the satellite may be a flying base station. The base station may be an access device for a terminal to access the NTN.

[0083] In one embodiment, the satellite's cell follows the satellite's movement. Here, there is a relative velocity between the terminal and the NTN source cell.

[0084] In some embodiments, the terminal remains stationary relative to the ground while the NTN source cell moves along a fixed trajectory relative to the ground. Alternatively, the terminal moves relative to the ground while the NTN source cell moves along a fixed trajectory relative to the ground. Here, the terminal and the satellite can move towards each other or in the same direction.

[0085] In one embodiment, each source cell corresponds to a reference location. This reference location is used to determine the location of the source cell. In one embodiment, the reference location may be determined based on the center location of the source cell. For example, the reference location may be the center location of the source cell.

[0086] In one embodiment, the decision to perform a cell reselection operation is made based on the positional relationship between the reference locations of the terminal and the source cell.

[0087] Here, the positional relationship between the terminal and the source cell can be the distance relationship and / or the angle relationship between the terminal and the source cell.

[0088] In one embodiment, the decision to perform a cell reselection operation is made based on the relationship between the coordinates of the terminal and the coordinates of the source cell.

[0089] In one embodiment, the terminal is a terminal that supports Global Navigation Satellite System (GNSS) positioning. The terminal periodically obtains its coordinates via GNSS. In this way, the terminal's location information can be updated in real time.

[0090] Here, the reference position of the source cell is different at different times (because the satellite is moving, the source cell moves with the satellite, therefore, the reference position of the source cell also moves with the satellite) and the position of the reference position relative to the source cell remains unchanged.

[0091] In one embodiment, the terminal can determine a reference position based on the received ephemeris information; and determine whether to perform a cell reselection operation based on the positional relationship between the reference positions of the terminal and the source cell.

[0092] Here, the terminal can receive ephemeris information sent by the base station in real time. The ephemeris information can be information associated with the satellite's position and / or motion state. The parameter values ​​of the information contained in the ephemeris information can differ at different times. For example, the satellite's position information can differ at different times. The position information can be position coordinates. In one embodiment, the ephemeris information includes at least one of the following: satellite trajectory information, satellite position information, satellite velocity information, and satellite orbital altitude information. Here, the terminal can determine the reference position of the source cell based on the ephemeris information.

[0093] In one embodiment, the terminal obtains ephemeris information through system messages broadcast by the source cell.

[0094] In one embodiment, cell reselection is determined to be performed in response to the distance between the terminal and the reference location being outside a threshold range; or, cell reselection is determined not to be performed in response to the distance between the terminal and the reference location being within a threshold range.

[0095] In one embodiment, the reference location is the center location of the source cell, P1 is the current real-time location coordinates of the terminal, and P2 is the center location coordinates of the source cell calculated in real time by the terminal based on the acquired ephemeris information. Then, the distance between the terminal and the center location of the source cell is:

[0096] ΔD=P1-P2

[0097] In one embodiment, when the distance ΔD between the terminal and the center location of the source cell is greater than or equal to D... Thres The terminal performs cell reselection; otherwise, it does not perform cell reselection; where D Thres The threshold value is indicated by the threshold range.

[0098] In another embodiment, when the distance ΔD between the terminal and the center of the source cell at the first moment... t ≥D Thres And the distance ΔD between the terminal and the center of the source cell at the second moment t-1 Less than ΔD t The terminal performs cell reselection; otherwise, it does not perform cell reselection; where D Thres The threshold value is indicated by the threshold range; the second time step precedes the first time step. This reduces the frequency of cell reselection caused by varying distances between the terminal and the source cell center, allowing the terminal to reliably perform cell reselection.

[0099] In one embodiment, the determination of whether to perform a cell reselection operation may be based on the distance and / or angle between the reference locations of the terminal and the source cell.

[0100] In one embodiment, cell reselection is determined to be performed in response to the relative reference angle and / or distance between the terminal and the reference location being outside a threshold range; or, cell reselection is determined not to be performed in response to the relative reference angle and / or distance between the terminal and the reference location being within a threshold range.

[0101] In one embodiment, the cell reselection operation is determined based on the average distance between the terminal and the reference location within a first predetermined time period.

[0102] In one embodiment, cell reselection is determined to be performed in response to the average distance between the terminal and the reference location being outside a threshold range within a first predetermined time period; and cell reselection is not performed in response to the average distance between the terminal and the reference location being within the threshold range within the first predetermined time period. Thus, since the average distance can more accurately reflect the relative positional relationship between the terminal and the reference location, the terminal can reliably perform cell reselection.

[0103] In one embodiment, in response to the distance between the terminal and the reference location being outside a threshold range, cell reselection is determined to be performed after a second predetermined time period. Here, since cell reselection is not performed immediately when the distance between the terminal and the reference location is outside the threshold range, but is determined to be performed after a second predetermined time period, frequent cell reselection caused by repeated changes in the distance between the terminal and the reference location can be reduced, and the terminal can reliably perform cell reselection.

[0104] In one embodiment, a second predetermined time period is determined based on the channel quality of the transmitted data. In another embodiment, in response to the channel quality of the transmitted data being greater than a channel quality threshold, the second predetermined time period is determined to be less than a time period threshold; in response to the channel quality of the transmitted data being less than a quality threshold, the second predetermined time period is determined to be greater than a time period threshold. Thus, the second predetermined time period can be adapted to the channel quality of the transmitted data.

[0105] In one embodiment, a threshold range is determined based on the signal coverage area of ​​the source cell. In one embodiment, the threshold range is greater than a first value if the signal coverage area of ​​the source cell is greater than the range threshold; and less than the first value if the signal coverage area of ​​the source cell is less than the range threshold. Thus, the threshold range can be adaptively adjusted according to the signal coverage area of ​​the source cell. In one embodiment, the signal coverage area information may include the radius, diameter, and / or area range of the NTN source cell. This information may be obtained from ephemeris information.

[0106] In this embodiment, the decision to perform cell reselection is based on the positional relationship between the terminal and the source cell; where the cell is a cell covered by satellite signals. Since the decision is based on the positional relationship between the terminal and the source cell, only the positional relationship between the terminal and the source cell needs to be obtained to determine whether to perform cell reselection. Cell reselection based on reference signal received power results in more reliable handover. This improves the terminal's mobility performance.

[0107] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0108] like Figure 5 As shown, this embodiment provides a method for cell reselection, wherein the method is executed by a terminal, and the method includes:

[0109] Step 51: Based on the positional relationship between the reference positions of the terminal and the source cell, determine whether to perform a cell reselection operation; wherein, the position of the reference position relative to the source cell remains unchanged.

[0110] In one embodiment, the decision to perform a cell reselection operation can be based on the distance relationship between the reference locations of the terminal and the source cell.

[0111] In one embodiment, the determination of whether to perform a cell reselection operation may be based on the distance and / or angle between the reference locations of the terminal and the source cell.

[0112] In one embodiment, cell reselection is determined to be performed in response to the distance between the terminal and the reference location being outside a threshold range; or, cell reselection is determined not to be performed in response to the distance between the terminal and the reference location being within a threshold range.

[0113] In one embodiment, the decision to perform a cell reselection operation can be based on the distance and reference angle relationships between the reference locations of the terminal and the source cell.

[0114] In one embodiment, cell reselection is determined to be performed in response to the distance between the terminal and the reference location being outside a distance threshold range and the reference angle between the terminal and the reference location of the source cell being outside an angle threshold range; or, cell reselection is determined not to be performed in response to the distance between the terminal and the reference location being within a distance threshold range and the reference angle between the terminal and the reference location of the source cell being within an angle threshold range.

[0115] In one embodiment, cell reselection is determined to be performed in response to the fact that the average distance between the terminal and the reference location within a first time period is outside a distance threshold range and the average reference angle between the terminal and the reference location of the source cell is outside an angle threshold range; or, cell reselection is determined not to be performed in response to the fact that the average distance between the terminal and the reference location is within a distance threshold range and the average reference angle between the terminal and the reference location of the source cell is within an angle threshold range. Thus, since the average distance and average angle can more accurately reflect the relative positional relationship between the terminal and the reference location, the terminal can reliably perform cell reselection.

[0116] In one embodiment, in response to the distance between the terminal and the reference location being outside a threshold range and the reference angle between the terminal and the reference location of the source cell being outside an angle threshold range, cell reselection is determined to be performed after a second predetermined time period. Here, because cell reselection is not performed immediately when the distance between the terminal and the reference location is outside the threshold range and the reference angle between the terminal and the reference location of the source cell is outside the angle threshold range, but is determined to be performed after a second predetermined time period, frequent cell reselection caused by repeated changes in the distance and angle between the terminal and the reference location can be reduced, and the terminal can reliably perform cell reselection.

[0117] In one embodiment, each source cell corresponds to a reference location. This reference location is used to determine the location of the source cell. In one embodiment, the reference location can be determined based on the center location of the source cell. For example, the reference location can be the center location of the source cell. Here, if the signal coverage area of ​​the source cell is circular, the center location can be the center of that circle.

[0118] In one embodiment, the terminal can determine a reference position based on the received ephemeris information. Here, the terminal may receive ephemeris information sent by a base station in real time. The ephemeris information may be information associated with the position and / or motion state of a satellite.

[0119] In one embodiment, the parameter values ​​of the information contained in the ephemeris information may differ at different times. For example, the satellite's position information and cell position may differ at different times. Here, the position information may be position coordinates. In one embodiment, the ephemeris information includes at least one of the following: satellite trajectory information, satellite position information, satellite velocity information, and satellite orbital altitude information. Here, since the satellite cell position is associated with the satellite's ephemeris information, the terminal can determine the reference position of the source cell based on the ephemeris information. It should be noted that the reference position is a position determined based on the satellite cell; therefore, when the satellite cell moves, the reference position relative to the satellite cell does not change; the reference position moves with the satellite cell.

[0120] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0121] like Figure 6 As shown, this embodiment provides a method for cell reselection, wherein the method is executed by a terminal, and the method includes:

[0122] Step 61: In response to the distance between the terminal and the reference location being outside the threshold range, determine to perform cell reselection; or, in response to the distance between the terminal and the reference location being within the threshold range, determine not to perform cell reselection.

[0123] In one embodiment, the reference location is the center location of the source cell, P1 is the current real-time location coordinates of the terminal, and P2 is the center location coordinates of the source cell calculated in real time by the terminal based on the acquired ephemeris information. Then, the distance between the terminal and the center location of the source cell is:

[0124] ΔD=P1-P2

[0125] In one embodiment, when the distance ΔD between the terminal and the center location of the source cell is greater than or equal to D... Thres The terminal performs cell reselection; otherwise, it does not perform cell reselection; where D Thres The threshold value is indicated by the threshold range.

[0126] In another embodiment, when the distance ΔD between the terminal and the center of the source cell at the first moment... t ≥D Thres And the distance ΔD between the terminal and the center of the source cell at the second moment t-1 Less than ΔD t The terminal performs cell reselection; otherwise, it does not perform cell reselection; where D Thres The threshold value is indicated by the threshold range; the second time step precedes the first time step. This reduces the frequency of cell reselection caused by varying distances between the terminal and the source cell center, allowing the terminal to reliably perform cell reselection.

[0127] In one embodiment, the decision to perform a cell reselection operation may be based on the average distance between the reference locations of the terminal and the source cell within a first predetermined time period.

[0128] In one embodiment, cell reselection is determined to be performed in response to the average distance between the terminal and the reference location being outside a threshold range within a first predetermined time period; and cell reselection is not performed in response to the average distance between the terminal and the reference location being within the threshold range within the first predetermined time period. Thus, since the average distance can more accurately reflect the relative positional relationship between the terminal and the reference location, the terminal can reliably perform cell reselection.

[0129] In one embodiment, in response to the distance between the terminal and the reference location being outside a threshold range, cell reselection is determined to be performed after a second predetermined time period. Here, since cell reselection is not performed immediately when the distance between the terminal and the reference location is outside the threshold range, but is determined to be performed after a second predetermined time period, frequent cell reselection caused by repeated changes in the distance between the terminal and the reference location can be reduced, and the terminal can reliably perform cell reselection.

[0130] In one embodiment, a threshold range is determined based on the signal coverage area of ​​the source cell. In one embodiment, the threshold range is greater than a first value if the signal coverage area of ​​the source cell is greater than the range threshold; and less than the first value if the signal coverage area of ​​the source cell is less than the range threshold. Thus, the threshold range can be adaptively adjusted according to the signal coverage area of ​​the source cell. In one embodiment, the signal coverage area information may include information about the radius, diameter, and / or area of ​​the NTN source cell. This information may be obtained from ephemeris information.

[0131] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0132] like Figure 7 As shown, this embodiment provides a method for cell reselection, wherein the method is executed by a terminal, and the method includes:

[0133] Step 71: Determine the threshold range based on the signal coverage area of ​​the source cell.

[0134] In one embodiment, the signal coverage area of ​​the source cell can be the ground area that the signal of the NTN source cell can cover.

[0135] In one embodiment, the signal coverage area of ​​the source cell is determined based on the transmission power of the satellite in the source cell.

[0136] In one embodiment, in response to the source cell's satellite transmit power being greater than a power threshold, the signal coverage area of ​​the source cell is determined to be greater than a second value; in response to the source cell's satellite transmit power being less than a power threshold, the signal coverage area of ​​the source cell is determined to be less than the second value. Thus, the signal coverage area of ​​the source cell can be adaptively adjusted according to the source cell's satellite transmit power.

[0137] In one embodiment, a threshold range is determined based on the signal coverage area of ​​the source cell. In one embodiment, the threshold range is greater than a first value in response to the source cell's signal coverage area being greater than the range threshold; the threshold range is less than the first value in response to the source cell's signal coverage area being less than the range threshold. Thus, the threshold range can be adaptively adjusted according to the source cell's signal coverage area. In one embodiment, the signal coverage area information may include: the radius, diameter, and / or area range of the source cell. In another embodiment, the signal coverage area information may include: the radius, diameter, and / or area range of the NTN source cell. Here, the signal coverage area information may be obtained from ephemeris information.

[0138] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0139] like Figure 8 As shown, this embodiment provides a method for cell reselection, wherein the method is executed by a terminal, and the method includes:

[0140] Step 81: In response to the fact that the first distance between the terminal and the reference location at the first moment is outside the threshold range and the first distance is greater than the second distance, determine to perform cell reselection;

[0141] The second distance is the distance between the terminal and the reference position at the second moment; the second moment precedes the first moment.

[0142] In one embodiment, in response to the terminal moving in a direction opposite to the reference position, it is determined that the first distance is greater than the second distance; in response to the terminal moving in the same direction as the reference position, it is determined that the first distance is less than the second distance.

[0143] In one embodiment, at a second time, the distance between the terminal and the reference location is a second distance; at a first time, the distance between the terminal and the reference location is a first distance; in response to the first distance being outside a threshold range and the first distance being greater than the second distance, it is determined to perform cell reselection.

[0144] In one embodiment, the first distance being outside a threshold range may be a first distance greater than a threshold value indicated by the threshold range. In one embodiment, cell reselection is determined to be performed in response to the first distance being greater than the threshold value indicated by the threshold range and the first distance being greater than a second distance.

[0145] Here, in the time domain, the second moment is before the first moment. The first moment can be the current moment. Here, the second moment can be the moment before the first moment when the terminal detects the positional relationship between the terminal and the reference position.

[0146] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0147] like Figure 9 As shown, this embodiment provides a method for cell reselection, wherein the method is executed by a terminal, and the method includes:

[0148] Step 91: Receive ephemeris information sent by the base station;

[0149] Determine the location of the reference position based on the ephemeris information.

[0150] Here, the reference position of the source cell is different at different times (because the satellite is moving, the source cell moves with the satellite, therefore, the reference position of the source cell also moves with the satellite) and the position of the reference position relative to the source cell remains unchanged.

[0151] In one embodiment, the terminal may periodically receive ephemeris information transmitted by the base station. Here, the ephemeris information may be information associated with the position and / or motion state of a satellite. The parameter values ​​of the information contained in the ephemeris information may differ at different times. For example, the satellite's position information may differ at different times. Here, the position information may be position coordinates. In one embodiment, the ephemeris information includes at least one of the following: satellite trajectory information, satellite position information, satellite velocity information, and satellite orbital altitude information. Here, since the reference position is associated with the ephemeris information, the terminal can determine the reference position of the source cell based on the ephemeris information.

[0152] In one embodiment, the reference location is a location determined based on the center location of the source cell; wherein the center location of the source cell is determined based on ephemeris information.

[0153] For example, see Figure 10 At time A, the satellite is at position 'a' on its orbit with an altitude of 'h'. Therefore, a reference position can be determined based on position 'a' and position 'h'. Here, the reference position is the center of the cell.

[0154] It should be noted that the reference location can also be another location determined based on the center location of the source cell. For example, a location due north of the center location and at a distance 'a' from the center location can be determined as the reference location.

[0155] In one embodiment, in response to the terminal establishing an RRC connection with the base station, it receives ephemeris information sent by the base station.

[0156] In one embodiment, an RRC message carrying ephemeris information is received.

[0157] In one embodiment, a random access message carrying ephemeris information is received. Here, the random access message may include a second random access message and a fourth random access message.

[0158] This improves the signaling compatibility of RRC messages and random access messages.

[0159] In one embodiment, the terminal obtains ephemeris information through system messages broadcast by the source cell.

[0160] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0161] like Figure 11 As shown, this embodiment provides a method for cell reselection, wherein the method is executed by a terminal, and the method includes:

[0162] Step 111: Receive the cell configuration information of the target cell for cell reselection.

[0163] In one embodiment, the cell configuration information includes one or more of the following:

[0164] Frequency information of the target cell;

[0165] Community identification ID information;

[0166] The measurement time configuration (SMTC) information for the synchronization signal block;

[0167] Subcarrier spacing information.

[0168] In one embodiment, the terminal receives the cell configuration information of the target cell for cell reselection via system messages.

[0169] Here, after the terminal receives the cell configuration information of the target cell and reselects the target cell, it can use the cell configuration information to transmit data in the target cell.

[0170] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0171] like Figure 12 As shown, this embodiment of the present disclosure provides a cell reselection apparatus, which is applied to a terminal. The apparatus includes a determination module 121; wherein,

[0172] The determination module 121 is configured to: determine whether to perform a cell reselection operation based on the location relationship between the terminal and the source cell; wherein, the cell is a cell covered by satellite signals.

[0173] It should be noted that those skilled in the art will understand that the methods provided in the embodiments of this disclosure can be executed alone or together with some methods in the embodiments of this disclosure or some methods in related technologies.

[0174] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0175] This disclosure provides a communication device, which includes:

[0176] processor;

[0177] Memory used to store processor-executable instructions;

[0178] The processor is configured to implement, when running executable instructions, the methods applicable to any embodiment of this disclosure.

[0179] The processor may include various types of storage media, which are non-transitory computer storage media that can continue to store information after the communication device loses power.

[0180] The processor can connect to the memory via a bus or other means to read executable programs stored in the memory.

[0181] This disclosure also provides a computer storage medium storing a computer executable program, which, when executed by a processor, implements the method of any embodiment of this disclosure.

[0182] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0183] like Figure 13 As shown, one embodiment of this disclosure provides a terminal structure.

[0184] Reference Figure 13 The terminal 800 shown in this embodiment is a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness device, personal digital assistant, etc.

[0185] Reference Figure 13 Terminal 800 may include one or more of the following components: processing component 802, memory 804, power supply component 806, multimedia component 808, audio component 810, input / output (I / O) interface 812, sensor component 814, and communication component 816.

[0186] Processing component 802 typically controls the overall operation of terminal 800, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0187] Memory 804 is configured to store various types of data to support operation on terminal 800. Examples of this data include instructions for any application or method operating on terminal 800, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0188] Power supply component 806 provides power to various components of terminal 800. Power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to terminal 800.

[0189] Multimedia component 808 includes a screen that provides an output interface between terminal 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When terminal 800 is in an operating mode, such as a shooting mode or video mode, the front-facing camera and / or rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0190] Audio component 810 is configured to output and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when terminal 800 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

[0191] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0192] Sensor assembly 814 includes one or more sensors for providing state assessments of various aspects of terminal 800. For example, sensor assembly 814 can detect the on / off state of terminal 800, the relative positioning of components such as the display and keypad of terminal 800, changes in the position of a component of terminal 800, the presence or absence of user contact with terminal 800, the orientation or acceleration / deceleration of terminal 800, and temperature changes of terminal 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, a gyroscope, a magnetometer, a pressure sensor, or a temperature sensor.

[0193] Communication component 816 is configured to facilitate wired or wireless communication between terminal 800 and other devices. Terminal 800 can access wireless networks based on communication standards, such as Wi-Fi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0194] In an exemplary embodiment, terminal 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0195] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, which can be executed by a processor 820 of a terminal 800 to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0196] like Figure 14 As shown, one embodiment of this disclosure illustrates the structure of a base station. For example, base station 900 can be provided as a network-side device. (Refer to...) Figure 14The base station 900 includes a processing component 922, which further includes one or more processors, and memory resources represented by a memory 932 for storing instructions, such as application programs, that can be executed by the processing component 922. The application programs stored in the memory 932 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 922 is configured to execute instructions to perform any of the methods described above applied to the base station.

[0197] Base station 900 may also include a power supply component 926 configured to perform power management of base station 900, a wired or wireless network interface 950 configured to connect base station 900 to a network, and an input / output (I / O) interface 958. Base station 900 can operate on an operating system stored in memory 932, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, or similar.

[0198] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0199] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method of reselecting a cell, wherein, The method is performed by a terminal, and the method comprises: determining whether to perform cell reselection based on a positional relationship between the terminal and a source cell; the operation of determining whether to perform cell reselection based on the positional relationship between the terminal and the source cell comprises: in response to a distance average value between the terminal and a reference position of the source cell in a first predetermined time period being outside a distance threshold range, a reference angle average value between the terminal and the reference position of the source cell in the first predetermined time period being outside an angle threshold range, and a first distance being greater than a second distance, determining to perform cell reselection after a second predetermined time period; wherein the first distance is a distance between the terminal and the reference position of the source cell at a first time point, and the second distance is a distance between the terminal and the reference position of the source cell at a second time point; the distance average value is an average value of the first distance and the second distance; the first predetermined time period comprises the first time point and the second time point, and the second time point is prior to the first time point; wherein the cell is a cell covered by a signal of a satellite.

2. The method of claim 1, wherein, The reference position is fixed relative to a position of the source cell.

3. The method of claim 2, wherein, the operation of determining whether to perform cell reselection based on the positional relationship between the terminal and the reference position of the source cell comprises: in response to a distance between the terminal and the reference position of the source cell being within a threshold range, determining not to perform cell reselection.

4. The method of claim 3, wherein, The method further comprises: determining the threshold range according to a size of a signal coverage area of the source cell.

5. The method of claim 2, wherein, The method further comprises: receiving ephemeris information sent by a base station; determining a position of the reference position of the source cell according to the ephemeris information.

6. The method of claim 5, wherein, The reference position is a position determined according to a center position of the source cell; wherein the center position of the source cell is determined according to the ephemeris information.

7. The method of claim 1, wherein, The method further comprises: receiving cell configuration information of a target cell for cell reselection.

8. The method of claim 7, wherein, The cell configuration information comprises one or more of: frequency point information of the target cell; cell identification (ID) information; synchronization signal block measurement time configuration (SMTC) information; subcarrier spacing information.

9. An apparatus for reselecting a cell, wherein, The apparatus is applied to a terminal, and the apparatus comprises a determination module; wherein the determination module is configured to determine whether to perform cell reselection based on a positional relationship between the terminal and a source cell; the operation of determining whether to perform cell reselection based on the positional relationship between the terminal and the source cell comprises: in response to a distance average value between the terminal and a reference position of the source cell in a first predetermined time period being outside a distance threshold range, a reference angle average value between the terminal and the reference position of the source cell in the first predetermined time period being outside an angle threshold range, and a first distance being greater than a second distance, determining to perform cell reselection after a second predetermined time period; The first distance is a distance between the terminal and a reference position of the source cell at a first time point, and the second distance is a distance between the terminal and the reference position of the source cell at a second time point; the distance average is an average of the first distance and the second distance; the first predetermined time period includes the first time point and the second time point; the second time point is prior to the first time point; and the cell is a cell covered by a satellite signal.

10. A communication device, wherein, The method comprises: an antenna; a memory; a processor, connected with the antenna and the memory respectively, configured to control the transceiving of the antenna by executing computer executable instructions stored in the memory, and capable of implementing the method provided in any one of claims 1 to 8.

11. A computer storage medium, storing computer executable instructions, which, when executed by a processor, are capable of implementing the method provided in any one of claims 1 to 8.

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