Communication method and apparatus

Abstract

The present application relates to the field of communications, and discloses a communication method and apparatus. The communication method comprises: a first terminal first receives first information which is from a source network device and indicates whether a beam position where the first terminal is located is in a first beam position set of the source network device, and each beam position in the first beam position set has a beam position of a target network device; and then the first terminal performs mobility management on the basis of the first information. The present application improves the mobility management efficiency of the terminal.

Description

Communication method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on November 13, 2023, with application number 202311515248.7 and application name “Communication Method and Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and in particular to communication methods and devices. Background Art

[0003] A satellite-ground converged communication network refers to a technology that combines non-terrestrial networks (NTN) and terrestrial networks (TN) to provide communication services. This network utilizes a unified network architecture and standards system, integrated wireless access, transmission, and network technologies, and integrated satellite-ground collaborative wireless resource allocation and service management. It provides broadband or narrowband access services for a variety of communication devices, meeting the anytime, anywhere communication needs of space-based, air-based, sea-based, and land-based users.

[0004] Existing NR / NTN terminal mobility management (e.g., reselection, redirection, etc.) is typically designed for satellite networks or terrestrial networks. It is not specifically designed for satellite-terrestrial converged network scenarios, resulting in low terminal mobility management efficiency in these scenarios.

[0005] Summary of the Invention

[0006] The present application provides a communication method and apparatus to improve the mobility management efficiency of a terminal.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] In a first aspect, a communication method is provided, which is applied to a terminal. The method may be performed by the terminal, a component or device (such as a processor, chip, or chip system) applied to the terminal, or a logic module or software that implements all or part of the terminal's functions. The method includes: first receiving first information indicating whether a waveband located by a first terminal 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; and then performing mobility management based on the first information.

[0009] 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.

[0010] 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 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.

[0011] In this implementation, for the scenario where the first terminal is in an idle state or an inactivated 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 the cell covered by the target network device, thereby improving the mobility management efficiency of the first terminal.

[0012] 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.

[0013] In this implementation, for the scenario where the first terminal is in an idle or 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, the cell is reselected to the cell covered by the target network device, thereby improving the mobility management efficiency of the first terminal.

[0014] In one implementation, performing cell reselection to a cell covered by the target network device may include: receiving second information, the second information being used to perform cell reselection to a cell covered by the target network device; and performing cell reselection to a cell covered by the target network device according to the second information.

[0015] In this implementation, after determining that the first terminal's wavelength is within the first wavelength set, the source network device configures the first terminal with second information for cell reselection, thereby ensuring the reliability of the first terminal's cell reselection. This also reduces the signaling overhead of the second information when the first terminal's wavelength is not within the first wavelength set.

[0016] 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.

[0017] In this implementation, the 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.

[0018] 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, where the third information indicates a redirection condition; and redirecting to a target network device when the first terminal meets the redirection condition and the wave position where the first terminal is located is in the 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] In one implementation, the method may further include: re-accessing the source network device 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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, chip, or chip system) applied to the source network device, or a logic module or software that can implement all or part of the functions of the source network device. The method includes: obtaining and sending first information indicating whether the waveband of a first terminal is in a first waveband set of the source network device, each waveband in the first waveband set having a waveband of a target network device; the first information can be used by the first terminal to perform mobility management on the first terminal.

[0027] 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.

[0028] In one implementation, the method further includes: sending second information, where the second information is used by the first terminal to perform cell reselection to a cell covered by the target network device.

[0029] 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.

[0030] 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.

[0031] In this implementation, the 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.

[0032] In one implementation, the method further includes: sending third information, where the third information indicates a redirection condition.

[0033] In this implementation, the source network device sends third information indicating the redirection condition. 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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, which can be used by the source network device to 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 mobility management.

[0040] 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 the 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 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; a processing module for performing mobility management based on the first information.

[0041] 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. The processing module is specifically used to: determine the wave position of the first terminal based on 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.

[0042] 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 waveband of the first terminal is in the first waveband set, reselect a cell covered by the target network device.

[0043] In one implementation, the first terminal is in an idle state or an inactive state, and the processing module is specifically configured to: when the waveband at which the first terminal is located is in the first waveband set, perform cell reselection to a cell covered by the target network device.

[0044] 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.

[0045] 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 the 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.

[0046] In one implementation, the transceiver module is further configured to receive fourth information indicating a first time for redirection to the target network device; and the processing module is specifically configured to redirect to the target network device within the first time.

[0047] In one implementation, the processing module is further configured to: re-access the source network device 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.

[0048] In one implementation, the transceiver module is further configured to receive fifth information indicating a second time for the source network device to start service; and the processing module is specifically configured to re-access the source network device at the second time.

[0049] 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 waveband of the first terminal is in the 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 used to perform mobility management on the first terminal.

[0050] 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.

[0051] 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.

[0052] In one implementation, the transceiver module is further configured to: send third information, where the third information indicates a redirection condition.

[0053] In one implementation, the transceiver module is further configured to: send fourth information, where the fourth information indicates the first time of redirection to the target network device.

[0054] In one implementation, the transceiver module is further configured to: send fifth information, where the fifth information indicates a second time at which the source network device starts the service.

[0055] In one implementation, the transceiver module is also used to: 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.

[0056] In a fifth aspect, the present application provides a communication device, comprising a processor and a transceiver, wherein the processor and the transceiver are configured to support the communication device in executing the method of the first aspect or the second aspect. Furthermore, the communication device may further comprise a memory storing computer instructions, and the processor may execute the computer instructions to execute the method of the first aspect or the second aspect. Furthermore, the communication device may further comprise a transceiver configured to execute the method of the first aspect or the second aspect.

[0057] 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.

[0058] 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 or second aspect described above.

[0059] 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.

[0060] In a ninth aspect, the present application provides a communication system, comprising a terminal and a network device, wherein the terminal is configured to execute the method of the first aspect, and the network device is configured to execute the method of the second aspect.

[0061] Among them, the beneficial effects described in the third to ninth aspects of this 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

[0062] FIG1 is a schematic diagram of a cell coverage scenario provided by an embodiment of the present application;

[0063] FIG2 is a schematic diagram of another cell coverage scenario provided by an embodiment of the present application;

[0064] FIG3 is a schematic diagram of another cell coverage scenario provided by an embodiment of the present application;

[0065] FIG4 is a schematic diagram of a group handover scenario provided by an embodiment of the present application;

[0066] FIG5 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0067] FIG6 is a flow chart of a communication method provided in an embodiment of the present application;

[0068] FIG7 is a schematic diagram of a wave position provided in an embodiment of the present application;

[0069] FIG8 is a flow chart of another communication method provided in an embodiment of the present application;

[0070] FIG9 is a schematic diagram of a communication scenario provided in an embodiment of the present application;

[0071] FIG10 is a schematic diagram of another communication scenario provided in an embodiment of the present application;

[0072] FIG11 is a flow chart of another communication method provided in an embodiment of the present application;

[0073] FIG12 is a flow chart of another communication method provided in an embodiment of the present application;

[0074] FIG13 is a flow chart of another communication method provided in an embodiment of the present application;

[0075] FIG14 is a schematic diagram of another communication scenario provided in an embodiment of the present application;

[0076] FIG15 is a schematic diagram of another communication scenario provided in an embodiment of the present application;

[0077] FIG16 is a schematic diagram of another communication scenario provided in an embodiment of the present application;

[0078] FIG17 is a schematic diagram of another communication scenario provided in an embodiment of the present application;

[0079] FIG18 is a flow chart of another communication method provided in an embodiment of the present application;

[0080] FIG19 is a flow chart of another communication method provided in an embodiment of the present application;

[0081] FIG20 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0082] FIG21 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

[0083] Figure 22 is a structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0084] 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 skilled in the art will 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 equally applicable to similar technical problems.

[0085] It should be noted that the terms "first" and "second" in the specification, claims, and drawings of this 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 such process, method, product, or device.

[0086] It should be understood that in the embodiments of the present application, "at least one (item)" refers to one or more, "more than one" 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 associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: 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 or plural items. For example, at least one of a, b or c can mean: 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 solely on A; 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 methods, 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.

[0087] Unless otherwise specified, the "transmission" (transmit / transmission) appearing in the embodiments of the present application refers to bidirectional transmission, including the actions of sending and / or receiving. 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.

[0088] Before introducing the embodiments of the present application, some terms involved in the embodiments of the present application are explained.

[0089] Wave position: Also known as a region or geographic area, it can be called by other names. This application does not specifically limit the name of a region fixed relative to the Earth. Specifically, a wave position is fixed relative to the Earth, or it can be understood as a wave position referring to a fixed geographic area relative to the Earth. For example, a wave position can have at least one of the following attributes: shape, outline, size, radius, area, geographic location, etc.

[0090] "Beach position" can also have an altitude attribute, that is, the beam position can be understood as a geographical area of ​​a given altitude or altitude range. By default, the beam position can refer to a geographical area with an altitude of 0 kilometers (km) above sea level or an altitude of about 0 km (such as within the range of [-2, 2] km), or a geographical area with an average altitude. In addition, it can also refer to a geographical area of ​​other specific altitudes or specific altitude ranges, such as a geographical area with an altitude of 10 km above sea level, or a geographical area with an altitude of about 10 km (such as within the range of [7, 13] km).

[0091] The shapes, contours, sizes, radii, and areas of different wave positions may or may not be the same. Different wave positions may or may not be geographically located. Different wave positions may or may not overlap.

[0092] In one possible implementation, the wave position is fixed relative to the Earth, which can be understood as: the profile, size, or geographical location of the wave position remains unchanged, for example, the profile, 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 profile and points in the wave position can be described by a three-dimensional coordinate system such as earth-centered earth-fixed (ECEF) coordinates, a geodetic coordinate system, or an earth-centered inertial (ECI) coordinate system, or the coordinates of each point on the wave position profile in a three-dimensional coordinate system such as the ECEF, geodetic coordinate system, or ECI coordinate system are fixed and unchanged.

[0093] In a possible embodiment, 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.

[0094] For example, the shape of a beam can be defined by a protocol or by a network device. The beam shapes defined by different network devices can be the same or different. The same network device can also define multiple beam shapes. Similarly, the size, radius, and area of ​​a beam can be defined by a protocol or by a network device. The size, radius, and area of ​​a beam can be the same or different across different network devices. The same network device can also define multiple beam sizes, beam radii, or beam areas.

[0095] A waveband can be served by one or more cells of the network device without restriction.

[0096] In NTNs, satellite communications offer unique advantages over terrestrial communications, such as wider coverage and reduced vulnerability to natural disasters and external forces. Supporting both ground-based and satellite communications is an inevitable trend in future fifth-generation mobile communication technology (5G) and even sixth-generation mobile networks (6G). It offers significant advantages in wide coverage, reliability, multiple connections, and high throughput.

[0097] Satellite communications are generally trending towards ultra-dense and heterogeneous systems. Specifically, the scale of satellite communications has grown from 66 satellites in the Iridium constellation to 720 in the OneWeb constellation, and ultimately to the Starlink ultra-dense low-Earth orbit satellite constellation of over 12,000. Secondly, satellite communications are becoming heterogeneous, evolving from traditional single-layer communications networks to multi-layer ones. Satellite communications are becoming increasingly compatible, and their functionality is becoming more complex and diverse. For example, they can enable navigation enhancement, Earth observation, and multi-dimensional information processing on-orbit.

[0098] In the NTN architecture, NTN cells can be divided into the following three categories based on their mobility characteristics in the ground coverage area:

[0099] The first type is earth-fixed. As shown in Figure 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. NTN cells provided by high elliptical orbit satellites (GEO) are of this type.

[0100] The second type is quasi-earth-fixed NTN. As shown in Figure 2, the coverage area of ​​this type of NTN cell is fixed to a specific ground area (Area 1) during a period of time t1-t2. At t3, it changes to another ground area (Area 2). This type of NTN cell provides fixed coverage within a specific time period. Low Earth Orbit Satellite (LEO) and Medium Earth Orbit Satellite (MEO) satellites can provide this type of NTN cell. Earth-fixed and quasi-earth-fixed NTN cells are collectively referred to as staring NTN cells.

[0101] The third type is earth-moving (also known as non-staring): As shown in Figure 3, the coverage area of ​​this type of NTN cell moves on the ground. The coverage area varies at different times t1, t2, and t3. LEO and MEO can provide this type of NTN cell.

[0102] NTNs are characterized by frequent terminal handovers and long terminal mobility interruptions. For example, in beam-hopping satellite communication systems, due to the high satellite speed of approximately 7.5 km / s, group handovers / group reselections occur approximately every few seconds to tens of seconds. Satellite motion can cause terminals within a given area to undergo group handovers or group reselections. In other words, in beam-hopping LEO satellite networks, group handovers / group reselections are a common occurrence. For example, as shown in Figure 4, at time T1, UE cluster UE-G1 (containing multiple UEs) within a single area in zone-2 is served by one or more beams of satellite SAT-2. However, at time T2, the motion of satellite SAT-2 causes its beam to no longer serve UE-G1. Consequently, one or more beams of satellite SAT-1 take over UE-G1's service. This indicates that a group handover has occurred for UE-G1.

[0103] Existing NR / NTN terminal mobility management (e.g., reselection, redirection, etc.) is typically designed for satellite or terrestrial networks. In satellite-terrestrial converged network scenarios, it is difficult for terminals to efficiently determine when and where to perform effective mobility management (e.g., reselecting from a TN to an NTN or vice versa). Furthermore, both signaling and measurement overhead are high. Consequently, terminal mobility management efficiency is low in this scenario.

[0104] 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.

[0105] The communication method provided in the embodiments 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 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 in the embodiments of the present application. The satellite communication system includes a transparent satellite architecture and a non-transparent satellite architecture. Transparent transmission, also known as bent-pipe forwarding, involves the signal undergoing only frequency conversion and amplification on the satellite, making the satellite transparent to the signal, as if it were not there. Non-transparent transmission, also known as regenerative (on-board access / processing) transmission, involves the satellite assuming some or all of the base station functions. 5G is also referred to as new radio (NR).

[0106] Exemplarily, the communication system includes a terminal, access network equipment, core network equipment, and ground station equipment.

[0107] Terminal equipment includes mobile devices that support an air interface (which can be any type of air interface, such as a 5G air interface) and can access satellite networks through the air interface to initiate calls, access the Internet, and other services. Terminals include various handheld devices with wireless communication capabilities, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. Specifically, they may refer to user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, 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 capabilities, 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 embodiments of the present application, the device for implementing the function of the terminal can be a terminal, or a device capable of supporting the terminal to implement the function, such as a chip system, which can be installed in the terminal or used in conjunction with the terminal. In the embodiments of the present application, the communication system is introduced by taking the terminal as an example of a UE.

[0108] 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 of 4G, 5G, or future-oriented 6G network. The access network equipment can also be an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), or an access network equipment of two or more of the above networks. Specifically, the access network equipment may include a base station, a wireless access point, a transmission receive point (TRP), a transmission point (TP) and any other access node. The access network equipment communicates with the core network equipment in a wired or wireless manner, such as through a next generation (NG) interface. Different access network devices can exchange signaling such as switching through the Xn interface. In the embodiments of the present application, the apparatus for implementing the functions of the access network device may be the access network device; or it may be a device capable of supporting the access network device in implementing the functions, 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 embodiments of the present application, the communication system is described using a base station as an example of the access network device.

[0109] Core network equipment: responsible for maintaining the subscription data of the mobile network and providing functions such as session management, mobility management, policy management and security authentication 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.

[0110] Ground station equipment: A component of a satellite or aerospace system, it includes gateway equipment and other ground-based equipment on Earth for space communications. It generally refers to ground-based equipment installed on Earth's surface (including those installed on ships and aircraft) for satellite communications. It primarily consists of a high-gain antenna system capable of tracking satellites, a high-power microwave transmitter system, a low-noise receiver system, and a power supply system. It is responsible for forwarding signaling and service data between access network equipment and core network equipment.

[0111] Figure 5 is a schematic diagram of a communication system provided in 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 broadcast 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 a network-side device carried on the satellite.

[0112] The embodiments of the present application are designed to improve the efficiency of terminal mobility management and to address possible communication scenarios (e.g., reselection, redirection, etc.) of the terminal. The terminal can efficiently determine which mobility management strategy should be adopted, thereby improving the efficiency of terminal mobility management. Figure 6 shows a flow chart of the communication method provided by the embodiments of the present application. As shown in Figure 6, the method may include the following steps:

[0113] S610: A source network device sends first information to a first terminal. Correspondingly, the first terminal receives the first information.

[0114] The first information indicates whether the waveband at which the first terminal is located is within the first waveband set of the source network device. The specific content of the first information can be flexibly configured. For example, the first information can include the first waveband set. The wavebands in the first waveband set are the wavebands of the source network device, and the wavebands in the first waveband set all contain wavebands of the target network device. In other words, the first waveband set can also be referred to as the set of wavebands that overlap (also known as jointly overlap) with the source network device. The following describes how the source network device determines the first waveband set: The source and target network devices can transmit waveband configuration information by reusing an existing Xn interface or NG interface, or by defining a new interface protocol. This waveband configuration information includes the third waveband set of the target network device. The source network device itself caches the second waveband set of the source network device. The second waveband set or the third waveband set includes area information (also known as a waveband pattern) for each waveband set, such as the total number or radius of wavebands in the waveband set, and information indicating the presence of each waveband in the pattern (e.g., number, identifier, etc.). 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.

[0115] For example, as shown in FIG7 , 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 position of the two source network devices in the middle and the wave position of the source network device on the right both contain the wave position of the target network device. In this example, the first wave position set includes the wave position of the two source network devices in the middle and the wave position of the source network device on the right.

[0116] In a scenario where the first information includes a first waveband set and a second waveband set, the terminal determines whether the terminal is within the first waveband set based on its location information. For example, the terminal's location information may be GNSS information. The specific process by which the terminal determines whether it is within the first waveband set will be described below in S810.

[0117] In another implementation, the first information may further 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).

[0118] S620: The first terminal performs mobility management according to the first information.

[0119] After the first terminal receives the first information, it can perform mobility management based on the first information, for example, determining whether to perform cell reselection, cell redirection, etc. Specifically, if the first information is used to indicate that the first terminal's waveband is in the first waveband 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). How to perform mobility management will be further explained below in conjunction with the terminal's state. In addition, if the first information is used to indicate that the first terminal's waveband is not in the first waveband set, the first terminal can maintain the current cell.

[0120] If cell reselection or cell redirection is determined, the source network device may send configuration information for cell reselection or cell redirection to the first terminal, such as the third wave bit set and frequency group information of the target network device, to implement mobility management for the first terminal.

[0121] 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.

[0122] In one embodiment, as shown in FIG8 , when the first terminal is in an idle state or an inactive state, performing mobility management according to the first information includes:

[0123] S810: The first terminal determines the wave position of the first terminal according to the wave position model information and the location information of the first terminal.

[0124] 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 based on the first information. The first terminal can be pre-set with a determination rule for determining the wave position where the first terminal is located. Exemplarily, the determination rule can be designed based on the Fibonacci criterion. Specifically, the first terminal can calculate the reference position of the wave position in the wave position model according to the wave position model information, until the reference position including the position of the first terminal 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 can satisfy the following relationship:

[0125] Among them, N spot Indicates the number of wave positions, [x] indicates 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 embodiment of the present application does not limit the specific form of the reference position. For example, the projection RL(x) of RL(i) on the unit square can be given as i ,y i ) satisfies the following relationship: RL(x i )=(1-cosθ i ) / 2

[0126] In another example, the Cartesian coordinates RL(x i ,y i ): RL(x i )=i / N spot

[0127] The frac(z) function returns the fractional part of z.

[0128] Alternatively, RL(i) can also satisfy the following relationship:

[0129] R e is the radius of the earth, and the typical value is 6378km. spot and wave radius R spot The following relationship is satisfied:

[0130] The latitude and longitude of the reference location can be expressed as RL(i) = (lon(i), lat(i))

[0131] Among them, lon represents longitude, lat represents latitude, 2N+1=N spot , lon(i) and lat(i) are in radians.

[0132] It should be understood that the above-mentioned rule for determining the reference position is an exemplary introduction. In specific implementation, other determination rules can also be designed without limitation.

[0133] S820: 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.

[0134] Among them, the first terminal is in an idle state or an inactive state, and has the 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 reselection is performed 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.

[0135] For example, as shown in Figure 9, 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. 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.

[0136] In another example, as shown in Figure 10, 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. At this time, UE3 can reselect from the cell covered by eNB-1 to the cell covered by SAT-1.

[0137] In an embodiment of the present application, when the first terminal is in an idle state or an inactive state and the waveband at which the first terminal is located is in the first waveband set, cell reselection is performed to a cell covered by the target network device, thereby improving the mobility management efficiency of the first terminal.

[0138] In one embodiment, the network device may also determine whether the wavelength of the first terminal is in the first wavelength set. In this scenario, when the first terminal is in an idle state or an inactive state, mobility management based on the first information may include:

[0139] 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.

[0140] The first information directly indicates that the wavelength of the first terminal is in the first wavelength set, and the first terminal does not need to determine whether the wavelength of the first terminal is in the first wavelength set according to a method similar to S810 (instead, the source network device determines it). In this case, the first terminal can directly reselect a cell to a cell covered by the target network device. For instructions on performing cell reselection, please refer to the instructions for S820 and will not be repeated here.

[0141] 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 waveband of the first terminal is in the first waveband set, cell reselection is performed to the cell covered by the target network device. The first terminal does not need to determine whether the waveband of the first terminal is in the first waveband set, thereby improving the mobility management efficiency of the first terminal.

[0142] In one embodiment, as shown in FIG11 , performing cell reselection on a cell covered by a target network device includes:

[0143] S111, the source network device sends second information to the first terminal, and correspondingly, the first terminal receives the second information.

[0144] Among them, the second information is used to perform cell reselection to the 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 group information of the target network device (for example, the third wave bit set, frequency, 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 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.

[0145] 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.

[0146] S112: The first terminal performs cell reselection to a cell covered by the target network device according to the second information.

[0147] After receiving the second information used by the first terminal for cell reselection, the first terminal may perform cell reselection based on the cell covered by the target network device.

[0148] 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.

[0149] 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.

[0150] In the embodiment of the present application, after determining that the first terminal's wavelength is within the first wavelength set, the source network device configures the first terminal with second information for cell reselection, thereby ensuring the reliability of the first terminal's cell reselection. This also reduces the signaling overhead of the second information when the first terminal's wavelength is not within the first wavelength set.

[0151] In one embodiment, as shown in FIG12 , the method further includes:

[0152] S121: The second terminal sends first waveband information and / or second waveband information to the source network device.

[0153] 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 the 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. The first wave position set is then determined based on the second wave position set and the third wave position set. In other words, the first wave position information and / or the second wave position information can be used to determine the first information.

[0154] Specifically, if the second terminal sends 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 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 as described in S610. If the second terminal sends both first and 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.

[0155] 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.

[0156] 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.

[0157] The reporting mode of the first wave position information and / or the second wave position information may be periodic reporting or event-triggered reporting, etc., without limitation.

[0158] 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 mobility management.

[0159] 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-terrestrial communication network device, and the target network device may be a terrestrial communication network device; or, the source network device may be a terrestrial communication network device, and the target network device may be a non-terrestrial communication network device.

[0160] In one embodiment, as shown in FIG13 , S620 (the first terminal performs mobility management according to the first information) may include:

[0161] S131: The source network device sends third information to the first terminal. Correspondingly, the first terminal receives the third information.

[0162] 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 based on the communication scenario. For example, the redirection condition can be set to the first terminal type, the first terminal's service type, etc.

[0163] If the first terminal meets the redirection condition and the waveband of the first terminal is in the first waveband set, execute:

[0164] S132: The first terminal is redirected to the target network device.

[0165] Among them, the first terminal redirects to the target network device. Specifically, the first terminal initiates random access to the target network device. Exemplarily, as shown in Figure 14, 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, for example, eNB-1. If UE4 meets the redirection conditions and the wave position where UE4 is located is in the first wave position set, UE4 can be redirected to eNB-1, that is, initiate random access to eNB-1. The scene after access is shown in Figure 15. UE4 is disconnected from SAT-1, and the coverage area of ​​SAT-1 moves out of the coverage area of ​​eNB-1. Early access to the terrestrial network is achieved.

[0166] The information used by the first terminal for redirection (e.g., the third wave bit set, frequency, priority, sub-carrier spacing (SCS), and measurement configuration information (SSB-based measurement timing configuration, SMTC) of the target network device) can be pre-configured for the first terminal by the source network device. Alternatively, the information can be immediately sent by the source network device to the first terminal. In other words, after determining to execute S132, the information can be sent by the source network device to the first terminal.

[0167] The redirection scenario is generally redirecting from an NTN network device to a TN network device. When redirecting, the first terminal first determines whether its location is in a waveband in the third waveband 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 waveband where the terminal is located, the first terminal can first select a TN network device with better signal quality (determined based on the frequency point group information of the corresponding TN network device) from the multiple TN network devices as the target network device to be redirected. The specific redirection process can be referred to the existing technology and will not be repeated here.

[0168] 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, the following steps are performed:

[0169] S133: The first terminal re-accesses the source network device.

[0170] 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.

[0171] For example, as shown in Figure 16, 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 waveband at which UE6 is located is not in the first waveband set (UE6 may not meet the redirection conditions; this example uses the case where UE6's waveband is not in the first waveband set as an example). UE6 then disconnects from the source network device and searches for and reconnects to the source network device. That is, it initiates access to SAT-1. The post-access scenario is shown in Figure 17, where UE6 has accessed the source network device SAT-1.

[0172] It should be understood that although the mobility management of each first terminal is described independently in the scenarios of Figures 9, 10, and 14-17 in the embodiments of the present application, in actual implementation, each first terminal can be in the same communication network. In other words, different first terminals can perform their own mobility management simultaneously without limitation.

[0173] 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.

[0174] In one embodiment, as shown in FIG18 , the method may further include:

[0175] S181: The source network device sends fourth information to the first terminal. Correspondingly, the first terminal receives the fourth information.

[0176] The fourth information indicates the first time when the first terminal is redirected to the target network device.

[0177] 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.

[0178] In the embodiment of the present application, the source network device indicates the time for redirection of the first terminal, and the first terminal can be redirected to the target network device, thereby improving the effectiveness of mobility management.

[0179] In one embodiment, as shown in FIG19 , the method further includes:

[0180] S191: The source network device sends fifth information to the first terminal. Correspondingly, the first terminal receives the fifth information.

[0181] The fifth information indicates the second time when the source network device starts the service.

[0182] 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.

[0183] 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.

[0184] To sum up, 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.

[0185] The above mainly introduces the solution 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 the execution of each function in order to implement the above functions. Those skilled in the art should easily appreciate 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 a hardware or computer software driven hardware manner 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 be beyond the scope of this application.

[0186] The embodiment of the present application can divide the terminal into functional modules 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 modules 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. In actual implementation, there may be other division methods.

[0187] In specific implementations, each network element shown in this application may adopt the structure shown in Figure 20 or include the components shown in Figure 20. Figure 20 is a schematic diagram of the structure of a communication device provided in an embodiment of this application. When the communication device has the functions of a terminal described in an embodiment of this application, the communication device may be a terminal or a chip or system-on-chip in the terminal. When the communication device has the functions of a network device described in an embodiment of this application, the communication device may be a network device or a chip or system-on-chip in the network device.

[0188] As shown in Figure 20, 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 one example, the processor 201 may include one or more CPUs, such as CPU0 and CPU1 in Figure 20.

[0189] As an optional implementation, the communication device includes multiple processors. For example, in addition to the processor 201 in FIG. 20 , it may also include a processor 207 .

[0190] The processor 201 may be a central processing unit (CPU), a general-purpose processor (GP), 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.

[0191] The communication line 202 is used to transmit information between the components included in the communication device.

[0192] Transceiver 203 is used to communicate with other devices or other communication networks. Such other communication networks may be Ethernet, radio access networks (RA20), wireless local area networks (WLA20), etc. Transceiver 203 may be an interface circuit, a pin, a radio frequency module, a transceiver, or any other device capable of communication.

[0193] Furthermore, the communication device may further include a memory 204. The memory 204 is configured to store instructions, wherein the instructions may be computer programs.

[0194] The memory 204 may 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 disk storage, magnetic disk storage media, or other magnetic storage devices. Optical disc storage includes compact discs, laser discs, optical discs, digital versatile discs, or Blu-ray discs, etc.

[0195] 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, program code, or some data. The memory 204 can be located within 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.

[0196] As an optional implementation, the communication apparatus further includes an output device 205 and an input device 206. For example, the input device 206 is a keyboard, a mouse, a microphone, a joystick, or the like, and the output device 205 is a display screen, a speaker, or the like.

[0197] It should be noted that the communication device may 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 device having a structure similar to that shown in FIG20 . Furthermore, the component structure shown in FIG20 does not limit the communication device. In addition to the components shown in FIG20 , the communication device may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0198] In the embodiment of the present application, the chip system can be composed of chips, or can include chips and other discrete devices.

[0199] Figure 21 shows a structural diagram of a communication device 210, which is applied to a terminal. Each module in the device shown in Figure 21 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 effects. The beneficial effects corresponding to the steps executed by each module can be referred 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:

[0200] The transceiver module 2101 is used to receive first information, where the first information is used to indicate whether the waveband of the terminal is in a 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 a waveband of the target network device; the processing module 2102 is used to perform mobility management based on the first information.

[0201] Figure 22 shows a structural diagram of a communication device 220, which is applied to a source network device. Each module in the device shown in Figure 22 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 effects. The beneficial effects corresponding to the steps executed by each module can be referred 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 source network device or a chip or system on chip in the source network device. For example: the communication device includes:

[0202] The transceiver module 2201 is used to obtain and send first information, where the first information is used to indicate whether the waveband of the terminal is in a 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 a waveband of the target network device; the first information is used to perform mobility management on the terminal.

[0203] The embodiment of the present application further provides a communication system, which includes a terminal and a source network device, wherein the terminal may have the functions of the communication device shown in FIG21 , and the source network device may have the functions of the communication device shown in FIG22 .

[0204] The embodiments of the present application also provide a computer-readable storage medium. All or part of the processes in the above-mentioned method embodiments can be completed by a computer program to instruct the relevant hardware, and the program can be stored in the above-mentioned computer-readable storage medium. When the program is executed, it can include the processes of the above-mentioned method embodiments. The computer-readable storage medium can be a terminal device of any of the above-mentioned 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 the terminal device. The above-mentioned computer-readable storage medium can also be an external storage device of the above-mentioned terminal device, such as a plug-in hard disk, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. equipped on the above-mentioned terminal device. Furthermore, the above-mentioned computer-readable storage medium can also include both the internal storage unit of the above-mentioned terminal device and an external storage device. The above-mentioned computer-readable storage medium is used to store the above-mentioned computer program and other programs and data required by the above-mentioned terminal device. The above-mentioned computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0205] The present application also provides a computer instruction. All or part of the process in the above method embodiment can be completed by the computer instruction to instruct the relevant hardware (such as a computer, processor, network device, and terminal, etc.). The program can be stored in the above computer-readable storage medium.

[0206] The present application also provides a chip system. This chip system can be composed of a chip or include a chip and other discrete components, without limitation. The chip system includes a processor and a transceiver. All or part of the processes in the above method embodiments can be completed by the chip system. For example, the chip system can be used to implement the functions performed by the network device or terminal in the above method embodiments.

[0207] 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 to enable the chip system to perform the functions performed by the network device or terminal in the above-mentioned method embodiment.

[0208] 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. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application may be directly implemented as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0209] In an 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), 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 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 an 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.

[0210] 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.

[0211] In the several embodiments provided in this 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 merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, 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.

[0212] The units described as separate components may or may not be physically separate, 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.

[0213] 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 separately, 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 this 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 and includes several instructions to enable a device, such as a single-chip microcomputer, a chip, etc., or a processor to execute 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 code, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0214] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection 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.

Images