Communication method and device

Abstract

The invention discloses a communication method and device, and relates to the field of communication. The communication method comprises the following steps: a first terminal firstly receives first information which is from source network equipment and indicates whether a beam position where the first terminal is located is in a first beam position set of the source network equipment, wherein each beam position in the first beam position set has a beam position of target network equipment; and then the first terminal performs mobility management according to the first information, so that the mobility management efficiency of the terminal is improved.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a communication method and device. Background Art

[0002] The satellite-ground integrated communication network refers to the technology that jointly uses non-terrestrial networks (NTN) and terrestrial networks (TN) for communication services. The satellite-ground integrated communication network uses a unified network architecture and standard system, integrated wireless access, transmission and network technologies, integrated satellite-ground collaborative wireless resource allocation and business management, and provides broadband or narrowband access services for a variety of communication devices to meet the communication needs of space-based, air-based, sea-based and land-based users anytime and anywhere.

[0003] The terminal mobility management (e.g., reselection, redirection, etc.) of existing NR / NTN is usually designed separately for satellite networks or ground networks. There is no targeted design for the satellite-ground integrated network scenario, and in this scenario, the terminal mobility management efficiency is low. Summary of the invention

[0004] The present application provides a communication method and device, which improve the mobility management efficiency of a terminal.

[0005] In order to achieve the above purpose, this application adopts the following technical solutions:

[0006] In a first aspect, a communication method is provided, which is applied to a terminal. The execution subject of the method can be a terminal, or a component or device (such as a processor, a chip, or a chip system, etc.) applied to the terminal, or a logic module or software that can realize all or part of the terminal functions. The method includes: first receiving first information indicating whether the wave position of the first terminal is in a first wave position set of a source network device, and each wave position in the first wave position set has a wave position of a target network device; then performing mobility management according to the first information.

[0007] In the first aspect, the source network device indicates to the first terminal through the first information: whether the wave position where the first terminal is located is in the first wave position set. The first terminal can perform mobility management based on the first information, thereby reducing the signaling overhead of the mobility management of the first terminal and improving the mobility management efficiency of the first terminal.

[0008] In one implementation, the first information includes wave position model information of the first wave position set and indication information of the wave position in the first wave position set. The first terminal is in an idle state or an inactive state. Mobility management is performed according to the first information, including: determining the wave position of the first terminal according to the wave position model information and the location information of the first terminal; when the wave position of the first terminal is the wave position indicated by the indication information, cell reselection is performed to the cell covered by the target network device.

[0009] In this implementation, for the scenario where the first terminal is in an idle state or an inactive state, the first terminal determines whether the wave position where the first terminal is located is in the first wave position set, and if the wave position where the first terminal is located is in the first wave position set, the first terminal reselects a cell covered by the target network device, thereby improving the mobility management efficiency of the first terminal.

[0010] In one implementation, the first terminal is in an idle state or an inactive state, and mobility management is performed according to the first information, including: when the waveband where the first terminal is located is in the first waveband set, cell reselection is performed to a cell covered by the target network device.

[0011] In this implementation, for the scenario where the first terminal is in an idle state or an inactive state, the first information directly indicates whether the wave position where the first terminal is located is in the first wave position set, and when the wave position where the first terminal is located is in the first wave position set, cell reselection is performed to the cell covered by the target network device, thereby improving the mobility management efficiency of the first terminal.

[0012] In one implementation, performing cell reselection to a cell covered by a target network device may include: receiving second information, the second information being used to perform cell reselection to a cell covered by a target network device; and performing cell reselection to a cell covered by a target network device according to the second information.

[0013] In this implementation, after determining that the wave position where the first terminal is located is in the first wave position set, the source network device configures the second information applied for cell reselection to the first terminal, thereby ensuring the reliability of the cell reselection by the first terminal. At the same time, the signaling overhead of the second information is reduced when the wave position where the first terminal is located is not in the first wave position set.

[0014] In one implementation, the source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; or, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

[0015] In this implementation, possible application scenarios of the present application are enriched: the source network device and the target network device can be terrestrial communication network devices or non-terrestrial communication network devices, respectively.

[0016] In one implementation, when the first terminal is in a connected state, mobility management is performed based on the first information, which may include: receiving third information, the third information indicating a redirection condition; when the first terminal meets the redirection condition and the wave position of the first terminal is in the first wave position set, redirecting to a target network device, wherein the source network device is a non-terrestrial communication network device and the target network device is a terrestrial communication network device.

[0017] In this implementation, the first terminal can determine whether to redirect to the target network device or reconnect to the source network device based on the received redirection conditions and whether the wave position of the first terminal is in the first wave position set, thereby reducing the frequency of mobility management and improving the mobility management efficiency of the first terminal.

[0018] In one implementation, the method may further include: receiving fourth information indicating a first time of redirecting to the target network device; redirecting to the target network device may include: redirecting to the target network device within the first time.

[0019] In this implementation, the source network device indicates to the terminal the first time to redirect to the target network device, so that the terminal can be redirected at the correct time, thereby improving the effectiveness of mobility management.

[0020] In one implementation, the method may further include: re-accessing the source network device when the first terminal does not meet the redirection condition and / or the waveband at which the first terminal is located is not in the first waveband set.

[0021] In this implementation, the first terminal can determine whether to redirect to the target network device or reconnect to the source network device based on the redirection condition and whether the wave position of the first terminal is in the first wave position set, thereby reducing the frequency of mobility management and improving the mobility management efficiency of the first terminal.

[0022] In one implementation, the method may further include: receiving fifth information indicating a second time when the source network device starts the service; re-accessing the source network device may include: re-accessing the source network device at the second time.

[0023] In this implementation, the source network device instructs the first terminal on the time when the source network device starts the service, which can ensure re-access to the source network device and improve the effectiveness of mobility management.

[0024] In a second aspect, a communication method is provided, which is applied to a source network device. The execution subject of the method can be the source network device, or a component or device (such as a processor, a chip, or a chip system, etc.) applied to the source network device, or a logic module or software that can realize all or part of the functions of the source network device. The method includes: obtaining and sending first information indicating whether the wave position where the first terminal is located is in a first wave position set of the source network device, and each wave position in the first wave position set has a wave position of the target network device; the first information can be used by the first terminal to perform mobility management on the first terminal.

[0025] In the second aspect, the source network device indicates to the first terminal through the first information: whether the wave position where the first terminal is located is in the first wave position set of the source network device. The first terminal can perform mobility management based on the first information, thereby reducing the signaling overhead of the mobility management of the first terminal and improving the mobility management efficiency of the first terminal.

[0026] In one implementation, the method further includes: sending second information, where the second information is used by the first terminal to reselect a cell covered by the target network device.

[0027] In this implementation, the source network device configures the first terminal with the second information used for cell reselection, thereby ensuring the reliability of the cell reselection performed by the first terminal.

[0028] In one implementation, the source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; or, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

[0029] In this implementation, possible application scenarios of the present application are enriched: the source network device and the target network device can be terrestrial communication network devices or non-terrestrial communication network devices, respectively.

[0030] In one implementation, the method further includes: sending third information, where the third information indicates a redirection condition.

[0031] In this implementation, the source network device sends third information indicating a redirection condition, and the first terminal can determine whether to redirect to the target network device or reconnect to the source network device based on the received redirection condition and whether the wave position of the first terminal is in the first wave position set, thereby reducing the frequency of mobility management and improving the mobility management efficiency of the first terminal.

[0032] In one implementation, the method further includes: sending fourth information, where the fourth information indicates the first time of redirecting to the target network device.

[0033] In this implementation, the source network device indicates to the terminal the first time to redirect to the target network device, so that the terminal can be redirected at the correct time, thereby improving the effectiveness of mobility management.

[0034] In one implementation, the method further includes: sending fifth information, where the fifth information indicates a second time for the source network device to start the service.

[0035] In this implementation, the source network device instructs the first terminal on the time when the source network device starts the service, which can ensure re-access to the source network device and improve the effectiveness of mobility management.

[0036] In one implementation, the method further includes: receiving first wave position information of a source network device wave position where at least one second terminal is located and / or second wave position information of a target network device wave position where at least one second terminal is located, wherein the first wave position information and the second wave position information are used to determine the first information.

[0037] In an embodiment of the present application, the source network device receives the first wave bit of the source network device where the second terminal is located and / or the second wave bit of the target network device where the second terminal is located, so that the source network device can determine a more accurate second wave bit set and / or third wave bit set, and apply it to the mobility management of the first terminal, thereby improving the effectiveness of the mobility management.

[0038] In a third aspect, the present application provides a communication device, which may be a first terminal or a chip or system on chip in the first terminal. The communication device may implement the functions performed by the first terminal in the above-mentioned first aspect or a possible design of the first aspect, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. For example, the communication device includes: a transceiver module for receiving first information, the first information being used to indicate whether the wave position at which the first terminal is located is in a first wave position set of a source network device, and each wave position in the first wave position set has a wave position of a target network device; a processing module for performing mobility management according to the first information.

[0039] In one implementation, the first information includes wave position model information of the first wave position set and indication information of the wave position in the first wave position set, the first terminal is in an idle state or an inactive state, and the processing module is specifically used to: determine the wave position of the first terminal according to the wave position model information and the location information of the first terminal; when the wave position of the first terminal is the wave position indicated by the indication information, reselect the cell to the cell covered by the target network device.

[0040] In one implementation, when the first terminal is in an idle state or an inactive state, the processing module is specifically used to: when the first information is used to indicate that the wave position where the first terminal is located is in the first wave position set, perform cell reselection to a cell covered by the target network device.

[0041] In one implementation, the first terminal is in an idle state or an inactive state, and the processing module is specifically used to: when the waveband where the first terminal is located is in the first waveband set, perform cell reselection to a cell covered by the target network device.

[0042] In one implementation, the source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; or, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

[0043] In one implementation, when the first terminal is in a connected state, the processing module is specifically used to: control the transceiver module to receive third information, where the third information indicates a redirection condition; and redirect to a target network device when the first terminal meets the redirection condition and the wave position of the first terminal is in a first wave position set, wherein the source network device is a non-terrestrial communication network device and the target network device is a terrestrial communication network device.

[0044] In one implementation, the transceiver module is further used to receive fourth information, where the fourth information indicates a first time to redirect to the target network device; and the processing module is specifically used to redirect to the target network device within the first time.

[0045] In one implementation, the processing module is further configured to: re-access the source network device when the first terminal does not meet the redirection condition and / or the waveband at which the first terminal is located is not in the first waveband set.

[0046] In one implementation, the transceiver module is further used to receive fifth information, the fifth information indicating a second time for the source network device to start the service; the processing module is specifically used to re-access the source network device at the second time.

[0047] In a fourth aspect, the present application provides a communication device, which may be a source network device or a chip or system on chip in the source network device. The communication device may implement the functions performed by the source network device in the above-mentioned first aspect or a possible design of the first aspect, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. For example, the communication device includes: a transceiver module for acquiring and sending first information, the first information being used to indicate whether the wave position at which the first terminal is located is in a first wave position set of the source network device, and each wave position in the first wave position set has a wave position of the target network device; the first information is used to perform mobility management on the first terminal.

[0048] In one implementation, the transceiver module is further used to: send second information, where the second information is used by the first terminal to reselect a cell covered by the target network device.

[0049] In one implementation, the source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; or, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

[0050] In one implementation, the transceiver module is further used to: send third information, where the third information indicates a redirection condition.

[0051] In one implementation, the transceiver module is further used to: send fourth information, where the fourth information indicates the first time of redirecting to the target network device.

[0052] In one implementation, the transceiver module is further used to: send fifth information, where the fifth information indicates a second time for the source network device to start the service.

[0053] In one implementation, the transceiver module is also used to: receive first wave position information of a source network device wave position where at least one second terminal is located and / or second wave position information of a target network device wave position where at least one second terminal is located, wherein the first wave position information and the second wave position information are used to determine the first information.

[0054] In a fifth aspect, the present application provides a communication device, the communication device includes a processor and a transceiver, the processor and the transceiver are used to support the communication device to execute the method of the first aspect or the second aspect. Further, the communication device may also include a memory, the memory stores computer instructions, and the processor can run the computer instructions to execute the method of the first aspect or the second aspect. Further, the communication device may also include a transceiver, the transceiver is used to execute the method of the first aspect or the second aspect.

[0055] In a sixth aspect, the present application provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed, the method of the first aspect or the second aspect is executed.

[0056] In a seventh aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method of the first aspect or the second aspect described above.

[0057] In an eighth aspect, the present application provides a chip, comprising a processor and a transceiver, wherein the processor and the transceiver are used to support a communication device to execute the method of the first aspect or the second aspect.

[0058] In a ninth aspect, the present application provides a communication system, the communication system comprising a terminal and a network device, wherein the terminal is used to execute the method of the first aspect, and the network device is used to execute the method of the second aspect.

[0059] Among them, the beneficial effects described in the third to ninth aspects of the present application can refer to the analysis of the beneficial effects of the first or second aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A schematic diagram of a cell coverage scenario provided in an embodiment of the present application;

[0061] Figure 2 A schematic diagram of another cell coverage scenario provided in an embodiment of the present application;

[0062] Figure 3 A schematic diagram of another cell coverage scenario provided in an embodiment of the present application;

[0063] Figure 4 A schematic diagram of a group switching scenario provided in an embodiment of the present application;

[0064] Figure 5 A schematic diagram of a communication system provided in an embodiment of the present application;

[0065] Figure 6 A flow chart of a communication method provided in an embodiment of the present application;

[0066] Figure 7 A wave position schematic diagram provided for an embodiment of the present application;

[0067] Figure 8 A flowchart of another communication method provided in an embodiment of the present application;

[0068] Fig. 9 A schematic diagram of a communication scenario provided in an embodiment of the present application;

[0069] Fig.10 A schematic diagram of another communication scenario provided in an embodiment of the present application;

[0070] Fig.11 A flowchart of another communication method provided in an embodiment of the present application;

[0071] Fig.12 A flowchart of another communication method provided in an embodiment of the present application;

[0072] Fig.13 A flowchart of another communication method provided in an embodiment of the present application;

[0073] Fig.14A schematic diagram of another communication scenario provided in an embodiment of the present application;

[0074] Fig.15 A schematic diagram of another communication scenario provided in an embodiment of the present application;

[0075] Fig.16 A schematic diagram of another communication scenario provided in an embodiment of the present application;

[0076] Fig.17 A schematic diagram of another communication scenario provided in an embodiment of the present application;

[0077] Fig.18 A flowchart of another communication method provided in an embodiment of the present application;

[0078] Fig.19 A flowchart of another communication method provided in an embodiment of the present application;

[0079] Fig. 20 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0080] Fig.21 A schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0081] Fig. 22 A schematic diagram of the structure of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0082] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0083] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0084] It should be understood that in the embodiments of the present application, "at least one (item)" refers to one or more, "multiple" refers to two or more, "at least two (items)" refers to two or three and more than three, and "and / or" is used to describe the association relationship of the associated objects, indicating that there can be three relationships. For example, "A and / or B" can represent: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following (items)" or similar expressions refers to any combination of these items, including any combination of single items (items) or plural items (items). For example, at least one of a, b or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple. It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A. For example, B can be determined based on A. It should also be understood that determining B based on A does not mean determining B based only on A, but B can also be determined based on A and / or other information. In addition, the "connection" in the embodiments of the present application refers to various connection modes such as direct connection or indirect connection to achieve communication between devices, and the embodiments of the present application do not impose any limitation on this.

[0085] Unless otherwise specified, the "transmission" (transmit / transmission) appearing in the embodiments of the present application refers to bidirectional transmission, including sending and / or receiving actions. Specifically, the "transmission" in the embodiments of the present application includes the sending of data, the receiving of data, or the sending of data and the receiving of data. In other words, the data transmission here includes uplink and / or downlink data transmission. Data may include channels and / or signals, uplink data transmission is uplink channel and / or uplink signal transmission, and downlink data transmission is downlink channel and / or downlink signal transmission. The "network" and "system" appearing in the embodiments of the present application express the same concept, and the communication system is the communication network.

[0086] Before introducing the embodiments of the present application, some terms involved in the embodiments of the present application are explained.

[0087] Wave position: also known as region or geographical area. Of course, there may be other names. This application does not specifically limit the name of the region fixed relative to the earth. Specifically, the wave position is fixed relative to the earth, or it can be understood that the wave position refers to a geographical area fixed relative to the earth. Exemplarily, the wave position may have at least one of the following attributes: shape, outline, size, radius, area, geographical location, etc.

[0088] "Body position" can also have a height attribute, that is, the wave position can be understood as a geographical area of ​​a given height or height range. By default, the wave position can refer to a geographical area with an altitude of 0 kilometers (km) above sea level or an altitude of about 0km (such as in the range of [-2, 2]km), or a geographical area with an average altitude. In addition, it can also refer to geographical areas of other specific heights or specific height ranges, such as a geographical area with an altitude of 10km, or a geographical area with an altitude of about 10km (such as in the range of [7, 13]km).

[0089] The shapes, contours, sizes, radii, and areas of different wave positions may be the same or different. Different wave positions may have different geographical locations. Different wave positions may or may not overlap.

[0090] In a possible implementation, the wave position is fixed relative to the earth, which can be understood as: the contour, size or geographical location of the wave position remains unchanged, for example, the contour, size or geographical location of the wave position does not change with time. Alternatively, the wave position is fixed relative to the earth, which can be understood as: the wave position contour and points in the wave position can be described by three-dimensional coordinate systems such as earth-centered earth-fixed (ECEF) coordinates, geodetic coordinate system, earth-centered inertial (ECI) coordinate system, or the coordinates of each point on the wave position contour in a three-dimensional coordinate system such as ECEF, geodetic coordinate system, ECI coordinate system, etc. are fixed and unchanged.

[0091] In a possible implementation, the shape of the wave position may be a regular hexagon, or other shapes such as a regular pentagon, a circle, an ellipse, etc. Alternatively, the shape of the wave position may also be an irregular shape, which is not limited.

[0092] Exemplarily, the shape of the wave position may be defined by a protocol or may be defined by a network device. The wave position shapes defined by different network devices may be the same or different. The same network device may also define multiple wave position shapes. Similarly, the size, radius, and area of ​​the wave position may also be defined by a protocol or may be defined by a network device. The wave position sizes, radii, and areas defined by different network devices may be the same or different. The same network device may also define multiple wave position sizes, multiple wave position radii, or multiple wave position areas.

[0093] A waveband can be served by one or more cells of a network device without restriction.

[0094] In NTN, satellite communication has its own unique advantages over terrestrial communication, such as providing a wider coverage area; satellite base stations are not easily damaged by natural disasters or external forces. Supporting communication with the ground and satellite is an inevitable trend for the future fifth generation mobile communication technology (5G) and even the sixth generation mobile communication standard (6G). It has great advantages in wide coverage, reliability, multiple connections, high throughput, etc.

[0095] Satellite communications are generally showing a trend of being ultra-dense and heterogeneous. Specifically, first, the scale of satellite communications has grown from 66 satellites in the Iridium constellation to 720 satellites in the OneWeb constellation, and eventually extended to the 12,000+ Starlink ultra-dense low-orbit earth satellite constellation; second, satellite communications are showing heterogeneous characteristics, gradually developing from traditional single-layer communication networks to multi-layer communication networks. Satellite communications are becoming more and more compatible, and their functions are also tending to be complex and diversified. For example, they can realize functions such as navigation enhancement, earth observation, and multi-dimensional information on-orbit processing.

[0096] In the NTN architecture, NTN cells can be divided into the following three categories according to their mobility characteristics in the ground coverage area:

[0097] The first type, earth-fixed: such as Figure 1 As shown in FIG. 1 , the coverage area of ​​this type of NTN cell is fixed to a certain area on the ground, that is, continuous fixed-point coverage. The NTN cell provided by a high elliptical orbit satellite (GEO) is of this type.

[0098] The second type, quasi-earth-fixed: such as Figure 2 As shown, the coverage area of ​​this type of NTN cell is fixed to a certain area on the ground - Area 1 during a period of time t1-t2, and is changed to another area on the ground - Area 2 at t3, that is, fixed-point coverage within a period of time. Low Earth Orbit Satellite (LEO) and medium orbit satellite (MEO) can provide this type of NTN cell. Earth-fixed and quasi-earth-fixed can be collectively referred to as staring type.

[0099] The third type is earth-moving (also called non-gazing type): Figure 3As shown, the coverage area of ​​this type of NTN cell slides on the ground. The coverage area is different at different times t1, t2 and t3. LEO and MEO can provide this type of NTN cell.

[0100] NTN has the characteristics of frequent terminal switching and long terminal movement interruption time. For example, in a beam-hopping satellite communication system, due to the fast movement speed of the satellite, about 7.5km / s, the frequency of group switching / group reselection is about every time / several seconds to tens of seconds. The movement of the satellite will cause the terminals in a certain area to perform group switching or group reselection. In other words, in a beam-hopping LEO satellite network, terminal group switching / group reselection becomes the norm. Taking group switching as an example, Figure 4 As shown in the figure, at time T1, UE cluster UE-G1 (UE-G1 contains multiple UEs) in a single beam in zone Zone-2 is served by one or more beams of satellite SAT-2. However, at time T2, the movement of satellite SAT-2 causes the beam of satellite SAT-2 to be unable to continue to serve UE-G1, and at this time, one or more beams of satellite SAT-1 take over the service of UE-G1. This means that group switching has occurred in UE-G1.

[0101] The existing NR / NTN terminal mobility management (e.g., reselection, redirection, etc.) is usually designed separately for satellite networks or ground networks. For the satellite-ground integrated network scenario, it is difficult for the terminal to efficiently determine when and where to perform efficient mobility management (e.g., reselect from TN to NTN or from NTN to TN, etc.), and the signaling overhead and measurement overhead are large. It can be seen that in this scenario, the terminal's mobility management efficiency is low.

[0102] In order to solve the above technical problems, an embodiment of the present application provides a communication method. The method provided by the embodiment of the present application is described below in conjunction with the drawings in the specification.

[0103] The communication method provided in the embodiment of the present application can be applied to various communication systems, such as satellite communication systems, high altitude platform station (HAPS) communication systems, non-terrestrial network (NTN) systems such as drones, etc. The following takes the communication system as a satellite communication system as an example for introduction. The satellite communication system may include: integrated communication and navigation (IcaN) system, global navigation satellite system (GNSS) and ultra-dense low-orbit satellite communication system, etc. The satellite communication system can be integrated with the traditional mobile communication system. For example, the traditional mobile communication system may be: long term evolution (LTE) system, 5G mobile communication system, wireless fidelity (Wi-Fi) system, future communication system, worldwide interoperability for microwave access (WiMAX) communication system, or a system integrating multiple communication systems, etc., which is not limited by the embodiment of the present application. The satellite communication system includes a transparent satellite architecture and a non-transparent satellite architecture. Transparent transmission is also called bent-pipe forwarding transmission: the signal only undergoes frequency conversion and signal amplification on the satellite, and the satellite is transparent to the signal, as if it does not exist. Non-transparent transmission is also called regenerative (on-board access / processing) transmission: the satellite has some or all base station functions. Among them, 5G can also be called new radio (NR).

[0104] Exemplarily, the communication system includes a terminal, an access network device, a core network device, and a ground station device.

[0105] Among them, terminal (terminal equipment): includes mobile devices that support air interface (the air interface can be various types of air interfaces, such as 5G air interface), which can access the satellite network through the air interface and initiate calls, Internet access and other services. Terminals include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems with wireless communication functions, and specifically refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device. The terminal may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a terminal in a 5G network or a future communication network, etc. In the embodiment of the present application, the device for implementing the function of the terminal may be a terminal, or may be a device capable of supporting the terminal to implement the function, such as a chip system, which may be installed in the terminal or used in combination with the terminal. In the embodiment of the present application, the communication system is introduced by taking the terminal as a UE as an example.

[0106] Access network equipment (in this application, access network equipment is referred to as network equipment for short): mainly used to implement at least one function of resource scheduling, wireless resource management, and wireless resource control of the terminal. The access network equipment can be an access network equipment in the third generation partnership project (3GPP), for example, an access network equipment for 4G, 5G, or future-oriented 6G networks. The access network equipment can also be an access network equipment for an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), or two or more of the above networks. Specifically, the access network equipment may include a base station, a wireless access point, a transceiver point (transmission receive point, TRP), a transmission point (transmission point, TP) and any other access node. The access network equipment communicates with the core network equipment by wired or wireless means, such as communicating with each other through the next generation (next generation, NG) interface. Different access network devices can exchange signaling such as switching through the Xn interface. In the embodiment of the present application, the device for implementing the function of the access network device may be the access network device; or it may be a device capable of supporting the access network device to implement the function, such as a chip system, which may be installed in the access network device or used in conjunction with the access network device. In the embodiment of the present application, the communication system is introduced by taking the access network device as a base station as an example.

[0107] Core network equipment: responsible for maintaining the subscription data of the mobile network, providing session management, mobility management, policy management and security authentication functions for the terminal. The core network equipment may include the following network elements: user plane function (UPF), authentication server function (AUSF), authentication management function (AMF), session management function (SMF), network exposure function (NEF), network function repository function (NRF), policy control function (PCF) and unified data management (UDM). Optionally, it may also include application function (AF) and unified data repository (UDR). The introduction of the above network elements can refer to the existing technology and will not be repeated here.

[0108] Ground station equipment: It is a component of a satellite or aerospace system, and is equipped with gateway equipment and other ground equipment on the earth for space communications. It generally refers to ground equipment installed on the earth's surface (including ships and aircraft) for artificial satellite communications. It is mainly composed of a high-gain antenna system that can track artificial satellites, a microwave high-power transmission system, a low-noise receiving system, and a power supply system. It is responsible for forwarding signaling and service data between access network equipment and core network equipment.

[0109] Figure 5 A schematic diagram of a communication system provided for an embodiment of the present application. The satellite communication system includes satellite 101, satellite 102 and satellite 103. Each satellite can provide communication services, navigation services, positioning services, etc. to the terminal through multiple beams, and satellite 103 is connected to the core network equipment. The satellite uses multiple beams to cover the service area, and different beams can communicate through one or more of time division, frequency division and space division. The satellite communicates wirelessly with the terminal through broadcasting communication signals and navigation signals, and the satellite can communicate wirelessly with the core network equipment. The satellite mentioned in the embodiment of the present application may be a satellite base station, and may also include an orbital receiver or repeater for relaying information, or may be a network-side device carried on a satellite.

[0110] The embodiment of the present application starts from improving the mobility management efficiency of the terminal and carries out targeted mobility management design for possible communication scenarios of the terminal (for example, reselection, redirection, etc.). The terminal can efficiently determine which mobility management strategy should be adopted, thereby improving the mobility management efficiency of the terminal. Figure 6 FIG. 1 is a flow chart showing a communication method provided by an embodiment of the present application. Figure 6 As shown, the method may include the following steps:

[0111] S610: A source network device sends first information to a first terminal, and correspondingly, the first terminal receives the first information.

[0112] Among them, the first information is used to indicate whether the wave position where the first terminal is located is in the first wave position set of the source network device. The specific content of the first information can be flexibly set. For example, the first information can include the first wave position set. The wave positions in the first wave position set are the wave positions of the source network device, and the wave positions of the target network device exist in the wave positions in the first wave position set. In other words, the first wave position set can also be called a set of wave positions of overlapping coverage (also called joint coverage) of the target network device and the source network device. The following describes how the source network device determines the first wave position set: the source network device and the target network device can transmit the wave position configuration information by reusing the existing Xn interface, NG interface or defining a new interface protocol, and the wave position configuration information includes the third wave position set of the target network device. The source network device itself caches the second wave position set of the active network device. The second wave position set or the third wave position set includes the area information of the respective wave position set (also called the wave position pattern), such as the total number or radius of the wave positions in the wave position set, and the indication information (such as number, identification, etc.) of each wave position in the wave position set in the pattern. The source network device may compare the second wavebit set and the third wavebit set to determine which wavebits in the second wavebit set are overlapped by wavebits in the third wavebit set, and the overlapped wavebits constitute the first wavebit set.

[0113] For example, Figure 7 As shown, the large hexagon represents the wave position of the source network device, the small hexagon represents the wave position of the target network device, and the wave positions of the two middle source network devices and the wave positions of the right source network device both contain the wave positions of the target network device. In this example, the first wave position set includes the wave positions of the two middle source network devices and the wave position of the right source network device.

[0114] In the scenario where the first information includes the first wave position set and the second wave position set, the terminal determines whether the terminal is in the first wave position set according to the location information of the terminal. For example, the location information of the terminal may be GNSS information. The specific determination process of the terminal determining whether it is in the first wave position set will be described in S810 below.

[0115] In another implementation, the first information may also directly indicate whether the wave position of the first terminal is in the first wave position set. For example, the first information is 1, indicating that the wave position of the first terminal is in the first wave position set. The first information is 0, indicating that the wave position of the first terminal is not in the first wave position set. In this scenario, the source network device has obtained the location information of the first terminal. The source network device can directly determine whether the first terminal is in the first wave position set based on the location information of the first terminal. Specifically, it can be determined by the Fibonacci criterion introduced in S810 below, which will not be explained here. The first information can be carried in various messages. For example, the first message can be carried in a system information block (SIB).

[0116] S620: The first terminal performs mobility management according to the first information.

[0117] Among them, after the first terminal receives the first information, it can perform mobility management according to the first information, for example, determine whether to perform cell reselection, cell redirection, etc. Specifically, if the first information is used to indicate that the wave position where the first terminal is located is in the first wave position set, the first terminal can perform cell reselection, cell redirection, etc. based on its own state (for example, connected state, idle state, and inactive state, etc.). The following will further explain how to perform mobility management in combination with the state of the terminal. In addition, if the first information is used to indicate that the wave position where the first terminal is located is not in the first wave position set, the first terminal can maintain the current cell.

[0118] If it is determined to perform cell reselection or cell redirection, the source network device may send configuration information of cell reselection or cell redirection to the first terminal, such as the third wave bit set of the target network device and the frequency point group information of the target network device, to implement mobility management of the first terminal.

[0119] In an embodiment of the present application, the source network device uses the first information to indicate to the first terminal whether the wave position where the first terminal is located is in the first wave position set. The first terminal can perform mobility management based on the first information, thereby reducing the signaling overhead of the mobility management of the first terminal and improving the mobility management efficiency of the first terminal.

[0120] In one embodiment, if Figure 8As shown, when the first terminal is in an idle state or an inactive state, mobility management is performed according to the first information, including:

[0121] S810: The first terminal determines the wave position of the first terminal according to the wave position model information and the position information of the first terminal.

[0122] Among them, the first information includes the wave position model information of the first wave position set and the indication information of the wave position in the first wave position set. In other words, the source network device does not directly indicate whether the wave position where the first terminal is located is in the first wave position set, and the first terminal needs to determine it by itself according to the first information. The first terminal may be pre-set with a determination rule for determining the wave position where the first terminal is located. Exemplarily, the determination rule may be designed based on the Fibonacci criterion. Specifically, the first terminal may calculate the reference position of the wave position in the wave position model according to the wave position model information until a reference position including the position where the first terminal is located is calculated, and the wave position of the reference position is determined as the wave position where the first terminal is located. Exemplarily, the reference position RL(i) of wave position i may satisfy the following relationship:

[0123]

[0124]

[0125]

[0126] Among them, N spot represents the number of wave positions, [x] represents the fractional part of x, such as x = 2.3, then [x] = 0.3. The above criteria can also be equivalently converted into longitude and latitude positions. The specific form of the reference position is not limited in the present embodiment. For example, the projection RL(x) of RL(i) on the unit square can be given as i ,y i ) satisfies the following relationship:

[0127] RL(x i )=(1-cosθ i ) / 2

[0128]

[0129] In another example, the Cartesian coordinates RL(x i ,y i ):

[0130] RL(x i )=i / N spot

[0131]

[0132] The frac(z) function returns the fractional part of z.

[0133] Alternatively, RL(i) can also satisfy the following relationship:

[0134]

[0135]

[0136]

[0137] R e is the radius of the earth, and the typical value is 6378 km. spot and wave radius R spot Satisfies the following relationship:

[0138]

[0139] The latitude and longitude of the reference position can be expressed as RL(i) = (lon(i), lat(i))

[0140]

[0141]

[0142] Among them, lon represents longitude, lat represents latitude, 2N+1=N spot , lon(i) and lat(i) are in radians.

[0143] It should be understood that the above-mentioned rule for determining the reference position is an exemplary introduction, and other determination rules may be designed in a specific implementation without limitation.

[0144] S820: When the wavelength at which the first terminal is located is the wavelength indicated by the indication information, reselect a cell to a cell covered by the target network device.

[0145] Among them, the first terminal is in an idle state or an inactive state, and there is a possibility of cell reselection. The wave position where the first terminal is located is the wave position indicated by the indication information, which indicates that the wave position where the first terminal is located is in the first wave position set, and the cell is reselected to the cell covered by the target network device. The information used by the first terminal for cell reselection (for example, frequency, priority, sub-carrier spacing (SCS), measurement configuration information (SSB-based measurement timing configuration, SMTC), etc.) can be pre-configured to the first terminal by the source network device. Alternatively, it is sent to the first terminal immediately by the source network device. In other words, after determining that the wave position where the first terminal is located is in the first wave position set, it is sent to the first terminal by the source network device. This implementation will be described in S111-S112.

[0146] For example, Fig. 9 As shown, in this scenario, the source network device is a non-terrestrial communication network device, such as SAT-1, and the target network device is a terrestrial communication network device, such as eNB-1. UE2 moves in the direction of the arrow, and at this time, UE2 can reselect from the cell corresponding to the wave position of UE2 covered by SAT-1 to the cell covered by eNB-1.

[0147] In another example, Fig.10 As shown, in this scenario, the target network device is a non-terrestrial communication network device, such as SAT-1, and the source network device is a terrestrial communication network device, such as eNB-1. UE3 moves in the direction of the arrow, and at this time, UE3 can reselect from the cell covered by eNB-1 to the cell covered by SAT-1.

[0148] In the embodiment of the present application, when the first terminal is in an idle state or an inactive state and the wave position at which the first terminal is located is in the first wave position set, cell reselection is performed to a cell covered by a target network device, thereby improving the mobility management efficiency of the first terminal.

[0149] In one embodiment, the network device may also determine whether the waveband of the first terminal is in the first waveband set. In this scenario, when the first terminal is in an idle state or an inactive state, mobility management is performed according to the first information, which may include:

[0150] When the first information is used to indicate that the wavelength at which the first terminal is located is in the first wavelength set, cell reselection is performed on a cell covered by the target network device.

[0151] Among them, the first information directly indicates that the wave position where the first terminal is located is in the first wave position set, and the first terminal does not need to determine whether the wave position where the first terminal is located is in the first wave position set according to means similar to S810 (but is determined by the source network device). At this time, the first terminal can directly reselect the cell covered by the target network device. The description of cell reselection can refer to the description of S820, which will not be repeated.

[0152] In an embodiment of the present application, the first terminal is in an idle state or an inactive state, and when the source network device directly indicates that the wave position where the first terminal is located is in the first wave position set, cell reselection is performed to the cell covered by the target network device. The first terminal does not need to determine whether the wave position where the first terminal is located is in the first wave position set, thereby improving the mobility management efficiency of the first terminal.

[0153] In one embodiment, if Fig.11 As shown, performing cell reselection to a cell covered by the target network device includes:

[0154] S111, the source network device sends second information to the first terminal, and correspondingly, the first terminal receives the second information.

[0155] Among them, the second information is used to reselect a cell to a cell covered by the target network device. Referring to the description of S820, the second information is the information used by the first terminal for cell reselection. Exemplarily, in a scenario where the source network device is NTN and the target network device is TN, the second information may include the third wave bit set of the target network device and the frequency point group information of the target network device (for example, the third wave bit set, frequency point, priority, subcarrier spacing SCS, measurement configuration information SMTC, etc. of the target network device). Alternatively, in a scenario where the source network device is TN and the target network device is NTN, the second information includes the frequency point group information of the target network device. The second information can be carried in various messages. Exemplarily, the second message can be carried in a system information block (SIB). The second information and the first information introduced in S610 can be carried in the same SIB or in different SIBs without limitation.

[0156] It should be understood that if the first information is used to indicate that the waveband at which the first terminal is located is not in the first waveband set, there is no need to transmit the second information, so as to save unnecessary signaling overhead and reduce the reselection frequency.

[0157] S112: The first terminal performs cell reselection to a cell covered by the target network device according to the second information.

[0158] After the first terminal receives the second information used by the first terminal for cell reselection, the first terminal can perform cell reselection based on the cell covered by the target network device.

[0159] Specifically, for the scenario where the source network device is NTN and the target network device is TN, the second information includes the third wave position set of the target network device and the frequency group information of the target network device. The first terminal first determines whether its own position is in the wave position in the third wave position set. If so, it performs cell reselection, otherwise it does not perform cell reselection. In addition, if there are multiple TN network devices in the wave position where the terminal is located, the first terminal can first select a TN network device with better signal quality (determined according to the frequency group information of the corresponding TN network device) from the multiple TN network devices as the target network device to be reselected. The specific reselection process can refer to the existing technology and will not be repeated here.

[0160] For the scenario where the source network device is TN and the target network device is NTN, the second information includes the frequency group information of the target network device. The first terminal can select a cell with better signal quality for reselection based on the frequency group information of the target network device. The specific reselection process can refer to the existing technology and will not be repeated here.

[0161] In the embodiment of the present application, after determining that the wave position of the first terminal is in the first wave position set, the source network device configures the second information applied for cell reselection to the first terminal, thereby ensuring the reliability of the cell reselection of the first terminal. At the same time, the signaling overhead of the second information is reduced when the wave position of the first terminal is not in the first wave position set.

[0162] In one embodiment, if Fig.12 As shown, the method also includes:

[0163] S121: The second terminal sends first wave bit information and / or second wave bit information to the source network device.

[0164] The first wave position information is used to indicate the wave position of the source network device where the second terminal is located, and the second wave position information is used to indicate the wave position of the target network device where the second terminal is located. The first wave position information can characterize the wave position status of the source network device, and the second wave position information can characterize the wave position status of the target network device. The second terminal can be multiple terminals, and multiple second terminals all send the first wave position information and / or the second wave position information to the source network device. The first wave position information can be used to determine the second wave position set of the source network device, and the second wave position information can be used to determine the third wave position set of the target network device, and then the first wave position set is determined based on the second wave position set and the third wave position set, that is, the first wave position information and / or the second wave position information can be used to determine the first information.

[0165] Specifically, if the second terminal sends the first wave bit information to the source network device, the second wave bit set can be determined based on the first wave bit information, and the first wave bit set can be determined in combination with the third wave bit set received in S610. Similarly, if the second terminal sends the second wave bit information to the source network device, the third wave bit set can be determined based on the second wave bit information, and the first wave bit set can be determined in combination with the second wave bit set cached by the source network device introduced in S610. In the case where the second terminal sends the first wave bit information and the second wave bit information to the source network device, the second wave bit set can be determined based on the first wave bit information, and the third wave bit set can be determined based on the second wave bit information, and then the first wave bit set can be determined.

[0166] Compared with the second wave bit set cached by the source network device and the received third wave bit set introduced in S610, the second wave bit set determined based on the first wave bit information reported by the second terminal and the third wave bit set determined based on the second wave bit information are more timely and accurate. Applying them to the mobility management of the first terminal improves the effectiveness of mobility management.

[0167] If the first wave bit information sent by the second terminal to the source network device cannot constitute a complete second wave bit set (or the second wave bit information cannot constitute a complete third wave bit set), the first wave bit information can be used to correct the second wave bit set cached by the source network device introduced in S610 to improve the accuracy of the second wave bit set. Similarly, the second wave bit information can be used to correct the third wave bit set received by the source network device introduced in S610 to improve the accuracy of the third wave bit set.

[0168] The first wave position information and / or the second wave position information may be reported in a periodic manner or in an event-triggered manner, and is not limited.

[0169] In an embodiment of the present application, the second terminal sends the first wave position information of the source network device where the second terminal is located and / or the second wave position information of the target network device where the second terminal is located to the source network device, so that the source network device can determine a more accurate second wave position set and / or third wave position set, and apply it to the mobility management of the first terminal, thereby improving the effectiveness of the mobility management.

[0170] In the above embodiments, for the scenario where the first terminal is in an idle or inactive state, the source network device may be a non-ground communication network device, and the target network device may be a ground communication network device; or, the source network device may be a ground communication network device, and the target network device may be a non-ground communication network device.

[0171] In one embodiment, if Fig.13 As shown, S620 (the first terminal performs mobility management according to the first information) may include:

[0172] S131, the source network device sends third information to the first terminal, and correspondingly, the first terminal receives the third information.

[0173] The first terminal is in a connected state, the source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device. The third information indicates a redirection condition. The redirection condition can be flexibly set according to the communication scenario. For example, the redirection condition can be set to the first terminal type, the service type of the first terminal, etc.

[0174] When the first terminal meets the redirection condition and the waveband of the first terminal is in the first waveband set, executing:

[0175] S132: The first terminal is redirected to the target network device.

[0176] The first terminal redirects to the target network device. Specifically, the first terminal initiates random access to the target network device. For example, Fig.14 As shown in FIG. 1 , in this scenario, the source network device is a non-terrestrial communication network device SAT-1, and the target network device is a terrestrial communication network device, such as eNB-1. If UE4 meets the redirection condition and the wave position where UE4 is located is in the first wave position set, UE4 can redirect to eNB-1, that is, initiate random access to eNB-1. The scenario after access is as follows Fig.15 As shown, UE4 is disconnected from SAT-1, and the coverage area of ​​SAT-1 moves out of the coverage area of ​​eNB-1, thus achieving early access to the terrestrial network.

[0177] The information applied by the first terminal for redirection (for example, the third wave bit set, frequency, priority, sub-carrier spacing (SCS), measurement configuration information (SSB-based measurement timing configuration, SMTC) of the target network device) can be pre-configured to the first terminal by the source network device. Alternatively, the information is sent to the first terminal immediately by the source network device. In other words, after determining to execute S132, the information is sent to the first terminal by the source network device.

[0178] The redirection scenario is generally redirection from an NTN network device to a TN network device. When redirecting, the first terminal first determines whether its location is in the wave position in the third wave position set. If so, redirection is performed, otherwise redirection is not performed for the time being. In addition, if there are multiple TN network devices in the wave position where the terminal is located, the first terminal can first select a TN network device with better signal quality (determined according to the frequency point group information of the corresponding TN network device) from multiple TN network devices as the target network device to be redirected. The specific redirection process can refer to the existing technology and will not be repeated here.

[0179] If the first terminal does not meet the redirection condition and / or the waveband at which the first terminal is located is not in the first waveband set, executing:

[0180] S133: The first terminal re-accesses the source network device.

[0181] If the first terminal is disconnected from the source network device when determining whether to redirect to the target network device, and the first terminal determines not to redirect, the first terminal may reconnect to the source network device.

[0182] For example, Fig.16 As shown, in this scenario, the source network device is a non-terrestrial communication network device SAT-1, and the target network device is a terrestrial communication network device, such as eNB-1. The wave position where UE6 is located is not in the first wave position set (UE6 may not meet the redirection condition, and this example takes the case where UE6 is located not in the first wave position set as an example), then UE6 disconnects from the source network device, and searches and accesses the source network device again. That is, it initiates access to SAT-1. The scenario after access is as follows Fig.17 As shown, UE6 is connected to the source network device SAT-1.

[0183] It should be understood that although in the embodiments of the present application Fig. 9 , Fig.10 , Figure 14-17 The mobility management of each first terminal is introduced independently in each scenario. However, in specific implementation, each first terminal may be in the same communication network. In other words, different first terminals may perform their own mobility management at the same time without limitation.

[0184] In an embodiment of the present application, the first terminal can determine whether to redirect to the target network device or re-access the source network device based on the redirection condition and whether the wave position of the first terminal is in the first wave position set, thereby reducing the frequency of mobility management and improving the mobility management efficiency of the first terminal.

[0185] In one embodiment, if Fig.18 As shown, the method may also include:

[0186] S181, the source network device sends fourth information to the first terminal, and correspondingly, the first terminal receives the fourth information.

[0187] The fourth information indicates the first time when the first terminal is redirected to the target network device.

[0188] Accordingly, in this embodiment, S132 (the first terminal redirects to the target network device) may include: S182, the first terminal redirects to the target network device within the first time.

[0189] In the embodiment of the present application, the source network device indicates the time for redirecting the first terminal, and can redirect it to the target network device, thereby improving the effectiveness of mobility management.

[0190] In one embodiment, if Fig.19 As shown, the method also includes:

[0191] S191, the source network device sends fifth information to the first terminal, and correspondingly, the first terminal receives the fifth information.

[0192] The fifth information indicates the second time when the source network device starts the service.

[0193] In this embodiment, S133 (the first terminal re-accesses the source network device) may include: S192, the first terminal re-accesses the source network device at a second time.

[0194] In the embodiment of the present application, the source network device instructs the first terminal on the time when the source network device starts the service, which can ensure re-access to the source network device and improve the effectiveness of mobility management.

[0195] To summarize, the embodiments of the present application start from improving the mobility management efficiency of the first terminal, and carry out targeted mobility management design for possible communication scenarios of the first terminal (for example, reselection, redirection, etc.). Under the premise of small overhead signaling, the first terminal can efficiently determine which mobility management strategy should be adopted, thereby improving the mobility management efficiency of the first terminal.

[0196] The above mainly introduces the scheme provided by the embodiment of the present application from the perspective of the execution logic of each step. It is understandable that each node, such as a terminal, includes a hardware structure and / or software module corresponding to each function in order to realize the above functions. Those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiment disclosed herein, the method of the embodiment of the present application can be implemented in the form of hardware, software, or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0197] The embodiment of the present application can divide the functional modules of the terminal according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0198] In specific implementation, each network element shown in this application can be used Fig. 20 The structure shown or includes Fig. 20 Parts shown. Fig. 20 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. When the communication device has the function of a terminal described in an embodiment of the present application, the communication device may be a terminal or a chip or system on chip in the terminal. When the communication device has the function of a network device described in an embodiment of the present application, the communication device may be a network device or a chip or system on chip in a network device.

[0199] like Fig. 20 As shown, the communication device may include a processor 201, a communication line 202, a transceiver 203, and a memory 204. The processor 201, the memory 204, and the transceiver 203 may be connected via the communication line 202. In an example, the processor 201 may include one or more CPUs, such as Fig. 20 CPU0 and CPU1 in.

[0200] As an optional implementation, the communication device includes multiple processors, for example, Fig. 20 In addition to the processor 201, a processor 207 may also be included.

[0201] The processor 201 may be a central processing unit (CPU), a general purpose processor (20P), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 201 may also be other devices with processing functions, such as circuits, devices, or software modules.

[0202] The communication line 202 is used to transmit information between the components included in the communication device.

[0203] The transceiver 203 is used to communicate with other devices or other communication networks. The other communication networks may be Ethernet, radio access network (RA20), wireless local area network (WLA20), etc. The transceiver 203 may be an interface circuit, a pin, a radio frequency module, a transceiver or any device capable of achieving communication.

[0204] Furthermore, the communication device may also include a memory 204. The memory 204 is used to store instructions, wherein the instructions may be computer programs.

[0205] Among them, the memory 204 can be a read-only memory (ROM) or other types of static storage devices that can store static information and / or instructions, or a random access memory (RAM) or other types of dynamic storage devices that can store information and / or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage, magnetic disk storage media or other magnetic storage devices, and the optical disc storage includes a compressed optical disc, a laser disc, an optical disc, a digital versatile disc, or a Blu-ray disc, etc.

[0206] It should be noted that the memory 204 can exist independently of the processor 201, or can be integrated with the processor 201. The memory 204 can be used to store instructions or program codes or some data, etc. The memory 204 can be located in the communication device or outside the communication device, without limitation. When the processor 201 executes the instructions stored in the memory 204, the method provided in the embodiment of the present application can be implemented.

[0207] As an optional implementation, the communication device further includes an output device 205 and an input device 206. Exemplarily, the input device 206 is a device such as a keyboard, a mouse, a microphone or a joystick, and the output device 205 is a device such as a display screen and a speaker.

[0208] It should be noted that the communication device can be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system or a Fig. 20 In addition, Fig. 20 The structure shown in the figure does not constitute a limitation on the communication device, except Fig. 20 In addition to the components shown, the communication device may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0209] In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices.

[0210] Fig.21 A structural diagram of a communication device 210 is shown, and the communication device is applied to a terminal. Fig.21 Each module in the device shown has the function of implementing the corresponding steps in the communication method provided in the embodiment of the present application, and can achieve its corresponding technical effect. The corresponding beneficial effects of the execution steps of each module can refer to the description of the corresponding steps, and will not be repeated here. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. The communication device can be a terminal or a chip or system on chip in the terminal. For example: the communication device includes:

[0211] The transceiver module 2101 is used to receive the first information, where the first information is used to indicate whether the waveband of the terminal is in the first waveband set, where the wavebands in the first waveband set are the wavebands of the source network device, and each waveband in the first waveband set contains the waveband of the target network device; the processing module 2102 is used to perform mobility management according to the first information.

[0212] Fig. 22 A structural diagram of a communication device 220 is shown, and the communication device is applied to a source network device. Fig. 22Each module in the device shown has the function of implementing the corresponding steps in the communication method provided in the embodiment of the present application, and can achieve its corresponding technical effect. The corresponding beneficial effects of the execution steps of each module can refer to the description of the corresponding steps, and will not be repeated here. The function can be implemented by hardware, or by hardware executing the corresponding software. The hardware or software includes one or more modules corresponding to the above functions. The communication device can be a source network device or a chip or system on chip in the source network device. For example: the communication device includes:

[0213] The transceiver module 2201 is used to obtain and send the first information, where the first information is used to indicate whether the wave position of the terminal is in the first wave position set, the wave positions in the first wave position set are the wave positions of the source network device, and each wave position in the first wave position set contains the wave position of the target network device; the first information is used to perform mobility management on the terminal.

[0214] The present application also provides a communication system, which includes a terminal and a source network device. The terminal may have Fig.21 The functions of the communication device shown in the figure, the source network device may have Fig. 22 Functionality of the communication device shown.

[0215] The embodiment of the present application also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be completed by a computer program to instruct the relevant hardware, and the program can be stored in the above computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The computer-readable storage medium can be a terminal device of any of the above embodiments, such as: an internal storage unit including a data sending end and / or a data receiving end, such as a hard disk or memory of a terminal device. The above computer-readable storage medium can also be an external storage device of the above terminal device, such as a plug-in hard disk equipped on the above terminal device, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. Further, the above computer-readable storage medium can also include both an internal storage unit of the above terminal device and an external storage device. The above computer-readable storage medium is used to store the above computer program and other programs and data required by the above terminal device. The above computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0216] The present application also provides a computer instruction. All or part of the process in the above method embodiment can be completed by computer instructions to instruct related hardware (such as computers, processors, network devices, and terminals, etc.). The program can be stored in the above computer-readable storage medium.

[0217] The embodiment of the present application also provides a chip system. The chip system can be composed of a chip, or can include a chip and other discrete devices, without limitation. The chip system includes a processor and a transceiver, and all or part of the processes in the above method embodiment can be completed by the chip system, such as the chip system can be used to implement the functions performed by the network device or terminal in the above method embodiment.

[0218] In one possible design, the above-mentioned chip system also includes a memory, which is used to store program instructions and / or data. When the chip system is running, the processor executes the program instructions stored in the memory so that the chip system performs the functions performed by the network device or terminal in the above-mentioned method embodiment.

[0219] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0220] In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may also be a circuit or any other device that can implement a storage function, for storing instructions and / or data.

[0221] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0222] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0223] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0224] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such an understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a device, such as: a single-chip microcomputer, a chip, etc., or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, ROM, RAM, disks, or optical disks.

[0225] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: Receive first information, where the first information is used to indicate whether the waveband at which the first terminal is located is in a first waveband set of a source network device, and each waveband in the first waveband set has a waveband of a target network device; Mobility management is performed according to the first information.

2. The communication method according to claim 1, characterized in that: The first terminal is in an idle state or an inactive state, and the performing mobility management according to the first information includes: In a case where the waveband at which the first terminal is located is in the first waveband set, cell reselection is performed on a cell covered by the target network device.

3. The communication method according to claim 1 or 2, characterized in that: The first information includes wave position model information of the first wave position set and indication information of the wave positions in the first wave position set, the first terminal is in an idle state or an inactive state, and the performing mobility management according to the first information includes: Determine the wave position of the first terminal according to the wave position model information and the location information of the first terminal; When the wavelength at which the first terminal is located is the wavelength indicated by the indication information, cell reselection is performed on a cell covered by the target network device.

4. The communication method according to claim 2 or 3, characterized in that: The performing cell reselection on a cell covered by the target network device includes: receiving second information; Perform cell reselection on a cell covered by the target network device according to the second information.

5. The communication method according to any one of claims 1 to 4, characterized in that: The source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; Alternatively, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

6. The communication method according to claim 1, characterized in that: The first terminal is in a connected state, and the performing mobility management according to the first information includes: receiving third information, wherein the third information indicates a redirection condition; When the first terminal meets the redirection condition and the wave position of the first terminal is in the first wave position set, redirection to the target network device is performed, wherein the source network device is a non-terrestrial communication network device and the target network device is a terrestrial communication network device.

7. The communication method according to claim 6, characterized in that: The method further comprises: receiving fourth information, the fourth information indicating a first time of redirecting to the target network device; The redirecting to the target network device includes: Redirect to the target network device within the first time.

8. The communication method according to claim 6, characterized in that: The method further comprises: When the first terminal does not meet the redirection condition and / or the waveband at which the first terminal is located is not in the first waveband set, re-access the source network device.

9. The communication method according to claim 8, characterized in that: The method further comprises: receiving fifth information, wherein the fifth information indicates a second time for the source network device to start a service; The re-accessing the source network device comprises: Re-access the source network device at the second time.

10. A communication method, characterized in that: include: Acquire first information, where the first information is used to indicate whether the waveband at which the first terminal is located is in a first waveband set of the source network device, and each waveband in the first waveband set has a waveband of the target network device; The first information is sent.

11. The communication method according to claim 10, characterized in that: The method further comprises: Sending second information, where the second information is used by the first terminal to reselect a cell covered by the target network device.

12. The communication method according to claim 10 or 11, characterized in that: The source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; Alternatively, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

13. The communication method according to claim 10, characterized in that: The method further comprises: Third information is sent, where the third information indicates a redirection condition.

14. The communication method according to claim 13, characterized in that: The method further comprises: Fourth information is sent, where the fourth information indicates a first time of redirecting to the target network device.

15. The communication method according to claim 13 or 14, characterized in that: The method further comprises: Send fifth information, where the fifth information indicates a second time when the source network device starts the service.

16. The communication method according to any one of claims 10 to 15, characterized in that: The method further comprises: Receive first wave position information of the source network device wave position where at least one second terminal is located and / or second wave position information of the target network device wave position where at least one second terminal is located, wherein the first wave position information and the second wave position information are used to determine the first information.

17. A communication device, characterized in that: include: A transceiver module, configured to receive first information, wherein the first information is used to indicate whether the waveband at which the first terminal is located is in a first waveband set of a source network device, each waveband in the first waveband set having a waveband of a target network device; A processing module is used to perform mobility management according to the first information.

18. The communication device according to claim 17, characterized in that: The first terminal is in an idle state or an inactive state, and the processing module is specifically configured to: In a case where the waveband at which the first terminal is located is in the first waveband set, cell reselection is performed on a cell covered by the target network device.

19. The communication device according to claim 17 or 18, characterized in that: The first information includes the wave position model information of the first wave position set and the indication information of the wave positions in the first wave position set, the first terminal is in an idle state or an inactive state, and the processing module is specifically used to: Determine the wave position of the first terminal according to the wave position model information and the location information of the first terminal; When the wavelength at which the first terminal is located is the wavelength indicated by the indication information, cell reselection is performed on a cell covered by the target network device.

20. The communication device according to claim 18 or 19, characterized in that: The processing module is specifically used for: Controlling the transceiver module to receive second information; Perform cell reselection on a cell covered by the target network device according to the second information.

21. The communication device according to any one of claims 17 to 20, characterized in that: The source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; Alternatively, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

22. The communication device according to claim 17, characterized in that: The first terminal is in a connected state, and the processing module is specifically configured to: Controlling the transceiver module to receive third information, where the third information indicates a redirection condition; When the first terminal meets the redirection condition and the wave position of the first terminal is in the first wave position set, redirection to the target network device is performed, wherein the source network device is a non-terrestrial communication network device and the target network device is a terrestrial communication network device.

23. The communication device according to claim 22, characterized in that: The transceiver module is further used to receive fourth information, where the fourth information indicates a first time of redirecting to the target network device; The processing module is specifically configured to redirect to the target network device within the first time.

24. The communication device according to claim 22, characterized in that The processing module is also used for: When the first terminal does not meet the redirection condition and / or the waveband at which the first terminal is located is not in the first waveband set, re-access the source network device.

25. The communication device according to claim 24, characterized in that The transceiver module is further used to receive fifth information, where the fifth information indicates a second time for the source network device to start a service; The processing module is specifically configured to re-access the source network device at the second time.

26. A communication device, characterized in that: include: A transceiver module, configured to obtain first information, wherein the first information is used to indicate whether the waveband at which the first terminal is located is in a first waveband set of a source network device, and each waveband in the first waveband set has a waveband of a target network device; The transceiver module is further used to send the first information.

27. The communication device according to claim 26, characterized in that The transceiver module is also used for: Sending second information, where the second information is used by the first terminal to reselect a cell covered by the target network device.

28. The communication device according to claim 26 or 27, characterized in that: The source network device is a non-terrestrial communication network device, and the target network device is a terrestrial communication network device; Alternatively, the source network device is a terrestrial communication network device, and the target network device is a non-terrestrial communication network device.

29. The communication device according to claim 26, characterized in that The transceiver module is also used for: Third information is sent, where the third information indicates a redirection condition.

30. The communication device according to claim 29, characterized in that The transceiver module is also used for: Fourth information is sent, where the fourth information indicates a first time of redirecting to the target network device.

31. The communication device according to claim 29 or 30, characterized in that: The transceiver module is also used for: Send fifth information, where the fifth information indicates a second time when the source network device starts the service.

32. The communication device according to any one of claims 26 to 31, characterized in that: The transceiver module is also used for: Receive first wave position information of the source network device wave position where at least one second terminal is located and / or second wave position information of the target network device wave position where at least one second terminal is located, wherein the first wave position information and the second wave position information are used to determine the first information.

33. A communication device, characterized in that: The communication device comprises a processor, and the processor is used to execute the method according to any one of claims 1-16.

34. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed, the method according to any one of claims 1 to 16 is executed.

35. A chip, characterized in that: The chip includes a processor and a communication interface, and the processor and the communication interface are used to support the chip to execute the method according to any one of claims 1-16.

36. A computer program product comprising instructions, characterized in that When the computer program product runs on a computer, the computer executes the method according to any one of claims 1 to 16.

37. A communication system, characterized in that: The communication system includes a terminal and a network device; wherein the terminal is used to execute the method according to any one of claims 1-9, and the network device is used to execute the method according to any one of claims 10-16.

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