Communication method, communication device and medium

Abstract

The embodiment of the invention discloses a communication method, a communication device and a medium, which are applied to the field of communication and are used for indicating synchronization signal power in a satellite coverage range. The method provided by the embodiment of the invention comprises the following steps: receiving broadcast information, wherein the broadcast information comprises corresponding values of a target parameter in one or more ground geographical location areas; and obtaining a first value according to a target area and the broadcast information, the target area being the ground geographical location area where the terminal device is located, the first value being a value corresponding to the target parameter in the target area, and the first value being used for indicating the power of a synchronization signal corresponding to the target area. According to the embodiment of the invention, the terminal equipment can obtain the power of the corresponding synchronization signal according to the difference of the geographical location area of the ground.

Description

Technical Field

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

[0002] In a non-terrestrial networks (NTN) network, satellite communication has a wider coverage range than a terrestrial cellular network. At the same time, it has the characteristics of long communication distance, high deployment flexibility, and being unaffected by geographical environment, natural disasters, and climate conditions. Therefore, it is widely used in fields such as aerospace, maritime communication, and military communication. Introducing satellites into the 6th generation mobile communication technology (6G) can provide communication connections for areas that are difficult to cover by terrestrial cellular networks, support more device access, thereby realizing an integrated space-air-ground network, and providing omnidirectional communication services for user equipment.

[0003] When a terminal device performs uplink power control, it needs to obtain the synchronization signal and the power of the PBCH block (synchronization signal and PBCH block, SSB), that is, the energy per resource element (EPRE), from the system information block (SIB) broadcast by the base station, and calculate the path loss in combination with the reference signal receiving power (RSRP). Among them, the transmission power of all SSBs sent by the base station under the existing new radio (NR) standard is the same.

[0004] Since the coverage range of a satellite is much larger than that of a terrestrial cellular network, the path loss of the satellite transmitting signal to the edge area of the coverage is quite different from the path loss of the signal to the sub-satellite point. Therefore, it is difficult for the existing technology to ensure the communication performance of SSB transmission within the satellite coverage. Summary of the Invention

[0005] Embodiments of the present application provide a communication method, a communication device, and a medium, which are applied to the field of communications and are used to improve the communication performance of SSB transmission.

[0006] In a first aspect of the embodiments of the present application, a communication method is provided. Optionally, the execution subject of this method can be a terminal device, or a component or device applied to the terminal device (such as a processor, a chip, or a chip system, etc.), or a logical module or software that can implement all or part of the functions of the terminal device. Taking the terminal device as an example, the terminal device is within the coverage of a satellite, and the satellite, as an NTN node, broadcasts to the terminal devices within the coverage. In this method, the terminal device receives a broadcast message from the NTN node, and the broadcast message includes the mapping relationship between the target parameter and the ground geographical location area, that is, the value of the target parameter corresponding to one or more ground geographical location areas. The terminal device determines the value of the target parameter in the target area, that is, the first value, according to the target area where it is located and the mapping relationship. This first value is used to indicate the power of the synchronization signal corresponding to the target area.

[0007] In the embodiments of the present application, since the broadcast information includes the values of the target parameter in one or more ground geographical location areas, the terminal device can obtain the corresponding first value from the broadcast message according to the area where the terminal device is located. This first value indicates the power of the synchronization signal required by the terminal device, enabling the NTN node to send the synchronization signal with different transmission powers according to different ground geographical location areas. At the same time, the terminal device can obtain the corresponding synchronization signal power. This improves the communication performance of SSB transmission and also enables the terminal device to obtain the corresponding power information.

[0008] In a second aspect of the embodiments of the present application, a communication method is provided. Optionally, the execution subject of this method can be an NTN node, or a component applied to the NTN node (such as a processor, a chip, or a chip system, etc.), or a logical module or software that can implement all or part of the functions of the NTN node. In this method, the NTN node broadcasts to the terminal devices within the ground coverage, and sends broadcast information to the terminal devices. The broadcast information includes the values of the target parameter corresponding to one or more ground geographical location areas, and this value represents the power of the synchronization signal sent by the NTN node to this area.

[0009] In a third aspect of the embodiments of the present application, a communication device is provided. This communication device can be a terminal device, or a component or device applied to the terminal device (such as a processor, a chip, or a chip system, etc.), or a logical module or software that can implement all or part of the functions of the terminal device. The communication device includes:

[0010] a receiving unit, configured to receive broadcast information, where the broadcast information includes the values of the target parameter corresponding to one or more ground geographical location areas;

[0011] An acquisition unit is configured to acquire a first value according to a target area and broadcast information. The target area is the ground geographical location area where the terminal device is located, and the first value is the value of a target parameter corresponding to the target area, and the first value is used to indicate the power of the synchronization signal corresponding to the target area.

[0012] Based on the first aspect and the third aspect of the embodiments of the present application, optionally, the terminal device receives ephemeris information from the NTN node, and the ephemeris information is used for the terminal device to determine the orbit and position where the NTN node is located. The terminal device obtains the specific coverage range of the ground geographical location area according to the ephemeris information, and then obtains its position information on the ground according to its own global navigation satellite system (GNSS). The terminal device obtains ground geographical location area information, and the ground geographical location area information is used to represent the specific position of the ground geographical location area in the mapping relationship. The terminal device determines the target area in one or more ground geographical location areas within the coverage range of the NTN node according to the ephemeris information, the ground position information, and the ground geographical location area information, and then obtains the first value of the target parameter in the target area from the broadcast message.

[0013] In the embodiments of the present application, the terminal device can more accurately determine the ground geographical location area where it is located according to the ephemeris information and the ground position information, so as to obtain the corresponding synchronization signal power.

[0014] Based on the first aspect and the third aspect of the embodiments of the present application, optionally, after the terminal device obtains the synchronization signal power corresponding to the target area, it calculates the path loss of the downlink signal according to the synchronization signal power. Further, the downlink path loss is reported to the NTN node.

[0015] In the embodiments of the present application, based on the first aspect and the third aspect of the embodiments of the present application, the terminal device can calculate the downlink path loss according to the obtained synchronization signal power, so as to realize the uplink power control of the terminal device.

[0016] Based on the first aspect and the third aspect of the embodiments of the present application, optionally, the terminal device also receives the SSB from the NTN node.

[0017] A fourth aspect of the embodiments of the present application provides a communication device, which may be an NTN node, or a component applied to the NTN node (such as a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the NTN node (such as a central unit (CU), a distributed unit (DU), or a radio unit (RU), etc.). The communication device includes:

[0018] A sending unit, configured to send broadcast information, where the broadcast information includes values corresponding to target parameters in one or more ground geographical location areas, and the values are used to indicate the power of synchronization signals corresponding to the one or more ground geographical location areas.

[0019] Based on the second and fourth aspects of the embodiments of the present application, optionally, the NTN node sends ephemeris information to the terminal device, and the ephemeris information is used to enable the terminal device to determine the ground geographical location area where it is located, and further obtain the corresponding synchronization signal power.

[0020] Based on the second and fourth aspects of the embodiments of the present application, optionally, the NTN node receives a measurement result from the terminal device, and the measurement result includes the downlink path loss calculated by the terminal device.

[0021] Based on the second and fourth aspects of the embodiments of the present application, optionally, the NTN node sends an SSB to the terminal device.

[0022] Based on the first to fourth aspects of the embodiments of the present application, optionally, the ground geographical location area can be represented by the elevation angle and azimuth angle of the NTN node relative to the ground geographical location area. Specifically, there is an included angle between the line connecting the NTN node to the satellite sub-point and the line connecting the NTN node to the center point of the ground geographical location area, and this included angle is the elevation angle of the NTN node relative to the ground geographical location area. Then, according to the azimuth angle of the center point of the ground geographical location area relative to the sub-point, the specific position of the center point of the ground geographical location area can be determined.

[0023] Based on the first to fourth aspects of the embodiments of the present application, optionally, the terminal device can also obtain the size of the coverage range of the ground geographical location area. Specifically, the size of the coverage range of the ground geographical location area can be represented by the radius of the ground geographical location area. The terminal device obtains the reference coordinates and radius of the ground geographical location area, or the terminal device obtains the elevation angle and azimuth angle of the NTN node relative to the ground geographical location area and the radius of the ground geographical location area to determine the ground geographical location area where it is located.

[0024] In the embodiments of the present application, by obtaining the specific size of the coverage range of the ground geographical location area and combining the reference coordinates of the center point of the ground geographical location area or the elevation angle and azimuth angle of the NTN node relative to the ground geographical location area, the terminal device can locate the ground geographical location area where it is located, so as to obtain the corresponding synchronization signal power.

[0025] Based on the first to fourth aspects of the embodiments of the present application, optionally, the target parameter in the broadcast information may be the energy per resource element (EPRE), a scaling factor, or an offset. The scaling factor is used to indicate the proportional relationship of the EPRE corresponding to each terrestrial geographical location area relative to a certain fixed EPRE value, and the offset is used to indicate the difference between the EPRE corresponding to each terrestrial geographical location area and a certain fixed EPRE value.

[0026] Based on the first to fourth aspects of the embodiments of the present application, optionally, when the target parameter is a scaling factor or an offset, the broadcast information further includes a preset second value, which is used as a reference value, and the terminal device calculates the synchronization signal power corresponding to the target area by calculating the first value and the second value.

[0027] Based on the first to fourth aspects of the embodiments of the present application, optionally, the broadcast information includes an emergency requirement level, which is used to indicate the urgency of the signal requirement in the terrestrial geographical location area, and the mapping relationship in the broadcast information is used to indicate the value of the target parameter corresponding to one or more terrestrial geographical location areas under different emergency requirement levels.

[0028] Based on the first to fourth aspects of the embodiments of the present application, optionally, the terrestrial geographical location area can be represented by reference coordinates. Specifically, the reference coordinates can be the longitude and latitude of a reference point, and the reference point can be the center point of the terrestrial geographical location area. The terminal device can determine which center point of the terrestrial geographical location area the terminal device is closer to according to its own longitude and latitude coordinates, so as to determine which terrestrial geographical location area it is in.

[0029] A fifth aspect of the embodiments of the present application provides a communication device, which may be a terminal device, or a component or device applied to a terminal device (such as a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the terminal device. Or the communication device may be an NTN node, or a component applied to the NTN node (such as a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the NTN node (such as CU, DU, or RU, etc.). The communication device includes:

[0030] A processor, configured to execute a program, so that the communication device executes the method described in the first aspect or the second aspect and any possible implementation manner thereof in the foregoing claims.

[0031] Optionally, the communication device further includes a memory, and the processor is coupled to the memory; the memory is used to store a program.

[0032] The sixth aspect of the embodiments of the present application provides a chip or a chip system, which includes at least one processor and a communication interface. The communication interface and the at least one processor are interconnected by a line. The at least one processor is configured to run a computer program or instruction to perform the communication method described in any one of the possible implementation manners of the foregoing first aspect to the second aspect.

[0033] Among them, the communication interface in the chip can be an input / output interface, a pin, a circuit, etc.

[0034] In a possible implementation, the chip or chip system described above in the present application further includes at least one memory, and instructions are stored in the at least one memory. The memory can be a storage unit inside the chip, such as a register, a cache, etc., or it can be a storage unit of the chip, such as a read-only memory, a random access memory, etc.

[0035] The seventh aspect of the embodiments of the present application provides a communication system, which includes a communication device that executes the communication method as described in the foregoing first aspect and any one of its possible implementation manners, and a communication device that executes the communication method as described in the foregoing second aspect and any one of its possible implementation manners.

[0036] The eighth aspect of the embodiments of the present application provides a computer-readable storage medium, which includes instructions. When the instructions are run on a computer, the computer is caused to execute the method as described in the foregoing first aspect, or the computer is caused to execute the method as described in the foregoing second aspect.

[0037] The ninth aspect of the embodiments of the present application provides a computer program product containing instructions. When it runs on a computer, the computer is caused to execute the method as described in the foregoing first aspect, or the computer is caused to execute the method as described in the foregoing second aspect. Description of the Drawings

[0038] Figure 1 It is a network architecture diagram in the embodiments of the present application;

[0039] Figure 2 It is a schematic diagram of the relative positions of the NTN node and the ground in the embodiments of the present application;

[0040] Figure 3 It is a schematic diagram of an embodiment of the communication method in the embodiments of the present application;

[0041] Figure 4 It is a schematic diagram of an embodiment of the representation method of the ground geographical location area in the embodiments of the present application;

[0042] Figure 5 It is a schematic diagram of another embodiment of the representation method of the ground geographical location area in the embodiments of the present application;

[0043] Figure 6 Schematic diagram of an embodiment of a communication device in an embodiment of the present application;

[0044] Figure 7 Schematic diagram of another embodiment of a communication device in an embodiment of the present application;

[0045] Figure 8 Schematic diagram of another embodiment of a communication device in an embodiment of the present application;

[0046] Figure 9 Schematic diagram of another embodiment of a communication device in an embodiment of the present application. Detailed implementation manners

[0047] The embodiments of the present application provide a communication method, a communication device and a medium, which are applied to the communication field and used to indicate the power of synchronization signals within the satellite coverage area.

[0048] The embodiments of the present application will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will understand that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0049] Terms such as "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing objects with the same attributes when describing the embodiments of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not necessarily have to be limited to those units, but may include other units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0050] Please refer to Figure 1 , and the network architecture on which the communication method in the embodiments of the present application is based will be briefly described below:

[0051] As Figure 1 shown, multiple terminal devices are connected to the NTN node, receive the SIB broadcast by the NTN node, and obtain information from the SIB. When the terminal device performs uplink power control, the terminal device needs to obtain the power of the SSB sent by the NTN node from the SIB, calculate the path loss of the downlink signal by calculating the SSB power and the RSRP, and then determine the power of the transmitted uplink signal according to the downlink path loss.

[0052] Figure 1The terminal device therein can be within the beam or cell coverage range of the network device. Among them, the terminal device can perform air interface communication with the network device through the uplink (UL) or the downlink (DL). For example: The terminal device can send uplink data to the network device through the physical uplink shared channel (PUSCH) in the UL direction; the network device can send downlink data to the terminal device through the physical downlink shared channel (PDSCH) in the DL direction. The terminal device can be a terminal device supporting the new air interface, can access the NTN node through the air interface, and initiate services such as calls and Internet access. The terminal device can also be called a user equipment (UE) or a mobile station (MS) or a mobile terminal (MT), etc. Specifically, Figure 1 the terminal device therein can be a mobile phone, a tablet computer, or a computer with wireless transceiver functions. It can also be a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in remote medical treatment, a wireless terminal in smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, a vehicle-mounted terminal, a vehicle with vehicle-to-vehicle (V2V) communication capabilities, a connected vehicle, a drone with unmanned aerial vehicle-to-unmanned aerial vehicle (UAV to UAV, U2U) communication capabilities, etc. Specific details are not limited here.

[0053] Exemplarily, the NTN node can be an access network device carried on a flying platform. When the access network device is carried on the flying platform, the access network device moves synchronously with the flying platform. The access network device and the flying platform can be regarded as a whole. At this time, the flying platform can be regarded as the access network device, or it can be described that the flying platform operates in the regenerative mode, that is, the flying platform has the functions of the access network device. In addition, the communication link between the flying platform and the terminal device can be called a service link. When there are multiple flying platforms in the communication system, the flying platforms can communicate with each other through the Xn interface. In practical applications, the network device can also be an access network device distributedly carried on the flying platform based on the distributed unit (DU), or directly act as the flying platform. Specific details are not limited here.

[0054] The above access network device can be any device with wireless transceiver functions, mainly used to implement functions such as wireless physical control, resource scheduling and wireless resource management, wireless access control, and mobility management, and to provide reliable wireless transmission protocols and data encryption protocols, etc. Specifically, the access network device can be a device supporting wired access or a device supporting wireless access. Exemplarily, the access network device can be an access network (AN) device, a radio access network (RAN) device, or an open radio access network (O-RAN) device. The RAN device can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation nodeB (gNB) in a 5th generation (5G) mobile communication system, a next generation nodeB in a 6th generation (6G) mobile communication system, a base station in a future mobile communication system, a wireless fidelity (WiFi) system, a long range radio (LoRa) system, or an access node in a vehicle-to-everything (V2X) system. The RAN device can also be a module or unit that completes some functions of the base station. For example, it can be a central unit (CU), a distributed unit (DU), or a remote unit (RU). Here, the CU completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete some or all of the functions of the physical layer. For specific descriptions of the above protocol layers, reference can be made to the relevant technical specifications of the 3rd generation partnership project (3GPP). The CU and DU can be set separately or can also be included in the same network element, such as a baseband unit (BBU).The RU may be included in a radio frequency device or a radio frequency unit, such as being included in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). In different systems, the CU, DU, or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, the CU may also be referred to as an O-CU (open CU), the DU may also be referred to as an O-DU, and the RU may also be referred to as an O-RU. Any one of the CU (or CU-CP, CU-UP), DU, and RU in this application may be implemented through a software module, a hardware module, or a combination of a software module and a hardware module.

[0055] The above-mentioned flying platform may be an aircraft such as a satellite or a drone. Exemplarily, the flying platform may include a geostationary earth orbit (GEO) satellite, a non-geostationary orbit satellite, a low-earth orbit (LEO) satellite, a medium-earth orbit (MEO) satellite, a geosynchronous orbit satellite, an unmanned flight system platform, or a high-orbit satellite, etc., and specific details are not limited here.

[0056] Among them, low-orbit and medium-orbit satellites may have their own orbits, and generally multiple satellites cooperate to provide communication for a fixed area. High-orbit satellites are generally in a stationary state, and one or a few high-orbit satellites provide communication for a fixed area.

[0057] Figure 2 The relative position relationship between the NTN node and the ground is shown. Based on the different satellite orbits where the NTN node is located, the coverage area of the NTN node is called a ground mobile cell or a ground fixed cell. For a ground mobile cell, the NTN node is stationary relative to the ground, that is, the NTN node and the ground move synchronously, so the NTN node corresponding to the ground mobile cell remains unchanged. For a ground fixed cell, the NTN node moves relative to the ground, so the NTN node corresponding to the ground fixed cell will change as the NTN node moves. The ground geographical location area is a part of the ground mobile cell or the ground fixed cell, and its specific position can be represented in various ways. The ground geographical location area where the terminal device is located is the target area.

[0058] Currently, the power of all SSBs sent by the base station is the same. Since the coverage range of the satellite is much larger than that of the terrestrial cellular network, the path loss of the satellite transmitted signal to the coverage edge area is quite different from the path loss to the sub-satellite point. If the transmission power of the SSB is small, the transmission performance of the SSB in the coverage edge area cannot be guaranteed. If the transmission power of the SSB is large, it will cause power waste in the central area.

[0059] To adapt to the much larger coverage range of the satellite than that of the terrestrial cellular network, flexible power can be used to send SSBs. For example, when sending the SSB corresponding to the coverage edge area, increase the transmission power of the SSB, and use a relatively lower transmission power in the central area.

[0060] However, when performing some power control related processes, the terminal device needs to know the power of the SSB sent by the base station. For example, when the terminal device performs uplink power control, it needs to obtain the SSB power, that is, EPRE, from the SIB, and calculate the path loss in combination with RSRP.

[0061] Therefore, in the embodiments of the present application, a method is provided. Please refer to Figure 3 A communication method in the embodiments of the present application includes:

[0062] 301. The NTN node sends broadcast information to the terminal device. Correspondingly, the terminal device receives the broadcast information. The broadcast information includes the values of the target parameter corresponding to one or more terrestrial geographical location areas.

[0063] In one way, the broadcast information indicates the mapping relationship between the terrestrial geographical location area and the target parameter.

[0064] The NTN node sends broadcast information to the terminal device, and the broadcast information includes the mapping relationship between the terrestrial geographical location area and the target parameter. The NTN node can send broadcast information to all terminal devices within the entire coverage range, or send broadcast information to the terminal devices within a certain terrestrial geographical location area. Multiple terminal devices within the terrestrial geographical location area receive the same broadcast information. The broadcast information includes one or more terrestrial geographical location areas within the coverage range of the NTN node and the values of the target parameter corresponding to the one or more terrestrial geographical location areas.

[0065] Exemplarily, the mapping relationship between the terrestrial geographical location area and the target parameter is shown in Table 1. Among them, the target parameter is EPRE. The values in the tables shown in the embodiments of the present application are only examples and do not represent the actual values.

[0066] Table 1

[0067] Ground geographical location area EPRE Area 1 10dBm Area 2 20dBm Area 3 30dBm Area 4 40dBm

[0068] As shown in Table 1, the broadcast information includes the identifier of the terrestrial geographical location area and the corresponding value of the target parameter. For example, Area 1 and the corresponding EPRE value for this area. The correspondence between the terrestrial geographical location area identifier and the terrestrial geographical location area can be predefined by agreement, or can be pre-indicated to the terminal device, or can be indicated to the terminal device together in the above broadcast information. The terrestrial geographical location area can be indicated by the terrestrial geographical location area information, that is, the terrestrial geographical location area information is used to represent the specific scope and size of the terrestrial geographical location area.

[0069] In a possible implementation, the terrestrial geographical location area identifier can be replaced by the terrestrial geographical location area information.

[0070] Specifically, the terrestrial geographical location area information can be the reference coordinates of the center point of the area and the radius of the area. Specifically, as shown in Table 2:

[0071] Table 2

[0072]

[0073]

[0074] As shown in Table 2, the terrestrial geographical location area can be represented by the reference coordinates of the center point of the area and the radius of the area. Please refer to Figure 4 , Figure 4 which shows a representation method of the terrestrial geographical location area. The terrestrial geographical location area information includes the reference coordinates of the center point of the terrestrial geographical location area and the radius of the area. The reference coordinates can be represented by the longitude and latitude of the reference point in the terrestrial geographical location area. The reference point can be the center point of the area or other points in the area. Specifically, it is not limited here. The terminal device determines the scope and specific location of the terrestrial geographical location area according to the terrestrial geographical location area information, and then determines its own coordinates according to GNSS, and further judges in which range of the terrestrial geographical location area the terminal device is, so as to determine the target area.

[0075] In practical applications, the terrestrial geographical location area information can include the reference coordinates of the center point of the terrestrial geographical location area. The terminal device calculates the distance of the terminal device relative to all center points according to its own coordinates and the reference coordinates of the center point, and selects the terrestrial geographical location area corresponding to the center point with the shortest distance as the target area.

[0076] Specifically, the terrestrial geographical location area information can also be the azimuth angle and elevation angle of the center point of the area relative to the NTN node and the radius of the area. Specifically, as shown in Table 3:

[0077] Table 3:

[0078]

[0079] Table 3 shows another representation of the ground geographical location area information. The ground geographical location area can be represented by the elevation angle and azimuth angle of the area relative to the NTN node and the radius of the area. Specifically, as Figure 5 shown, when the satellite is stationary relative to the ground, the NTN node is directly below the satellite relative to the ground, and the line connecting the NTN node to the point directly below the satellite is perpendicular to the ground. There is an angle between the line connecting the NTN node to the center point of the ground geographical location area and the line connecting the NTN node to the point directly below the satellite, and this angle is the elevation angle of the ground geographical location area relative to the NTN node. There is an angle between the line connecting the center point of the ground geographical location area to the point directly below the satellite and the ray in the due north direction, and this angle is the azimuth angle of the ground geographical location area relative to the NTN node. The specific position of the center point of the area can be determined by the two angles, and then the range of the ground geographical location area can be determined according to the radius of the area.

[0080] In practical applications, the center point of the ground geographical location area can also be determined by the angle and distance relative to the center point of the ground mobile cell or the ground fixed cell, and specific details are not limited here.

[0081] In the embodiments of the present application, since the satellite is stationary relative to the ground mobile cell, the elevation angle and azimuth angle of the NTN node relative to the ground geographical location area in the ground mobile cell are fixed. However, since the satellite is moving relative to the ground fixed cell, the elevation angle and azimuth angle of the NTN node relative to the ground geographical location area in the ground fixed cell are constantly changing. Therefore, in the ground fixed cell, the specific position of the ground geographical location area cannot be represented by the elevation angle and azimuth angle of the NTN node relative to the ground geographical location area, and only the angle and distance of the center point of the ground geographical location area relative to the center point of the cell, or the reference coordinates of the center point of the ground geographical location area can be used to represent it.

[0082] It can be understood that calculating the range of the ground geographical location area by the radius is only an example, and the range of the ground geographical location area can also be calculated by the side length or pre-configured, and specific details are not limited here. In practical applications, any point in the ground geographical location area can also be used as a reference point to represent the ground geographical location area, and specific details are not limited here.

[0083] In some possible implementation manners, the target parameter can be the EPRE scaling factor, or the EPRE offset, or other EPRE-related parameters, and specific details are not limited here. In other words, the EPRP in Table 1 above can be replaced by the EPRE scaling factor, the EPRE offset, or other EPRE-related parameters.

[0084] For example, the target parameter can be the EPRE scaling factor, and the broadcast information further includes a preset EPRE. The EPRE can be the EPRE of one of the ground geographical location regions or the EPRE corresponding to the sub-satellite point region of the NTN node. Specifically, it is not limited here. The EPRE scaling factor is used to indicate the proportional relationship of the EPRE in each ground geographical location region relative to the preset EPRE, as shown in Table 4 specifically:

[0085] Table 4

[0086]

[0087] In Table 4, the broadcast information includes the ground geographical location region identifier and the EPRE scaling factor corresponding to this region. For example, if the value of the preset EPRE included in the broadcast information is 20 dBm and the EPRE scaling factor corresponding to Region 1 is 0.8, then the EPRE corresponding to Region 1 can be calculated based on the scaling factor and the preset EPRE and is 16 dBm.

[0088] Also for example, the target parameter is the EPRE offset, the broadcast information includes a preset EPRE, and the EPRE offset is used to indicate the difference of each ground geographical location region relative to the preset EPRE, as shown in Table 5 specifically:

[0089] Table 5

[0090]

[0091] In Table 5, the broadcast information includes the ground geographical location region identifier and the EPRE offset corresponding to this region. For example, if the value of the preset EPRE included in the broadcast information is 30 dBm and the EPRE offset corresponding to Region 3 is -20, that is, the difference between the EPRE corresponding to Region 3 and the preset EPRE is -20, then the EPRE corresponding to Region 3 can be obtained by adding the EPRE offset and the preset EPRE and is 10 dBm.

[0092] In practical applications, both the EPRE scaling factor and the EPRE offset are positively correlated with the distance from the NTN node to the reference point. Specifically, the distance from the NTN node to the ground geographical location reference point satisfies:

[0093]

[0094] where d is the distance between the terminal device and the NTN node, x s is the coordinate of the NTN node on the x-axis in the Earth coordinate system, y s is the coordinate of the satellite on the y-axis in the Earth coordinate system, z sis the coordinate of the satellite on the z-axis in the Earth coordinate system. The coordinates of the NTN node in the Earth coordinate system can be calculated based on the ephemeris information.

[0095] When the position of the ground geographical location area is represented by the elevation angle and the azimuth angle, the distance from the NTN node to the ground geographical location reference point satisfies:

[0096]

[0097] where d represents the distance from the NTN node to the ground geographical location reference point, x represents the elevation angle, h represents the orbital height of the satellite, and r represents the radius of the Earth. The EPRE proportionality factor corresponding to the ground geographical location area is the ratio of the distance from the NTN node to the ground geographical location reference point to the distance from the NTN node to the sub-satellite point of the satellite.

[0098] The Earth coordinate system is a coordinate system established with the center of the Earth as the origin, the straight line from the center of the Earth to the 0-degree longitude on the equator as the x-axis, the straight line from the center of the Earth to the 90-degree east longitude on the equator as the y-axis, and the straight line from the center of the Earth to the North Pole direction as the z-axis.

[0099] It can be understood that the EPRE proportionality factor included in Table 4 can be represented by the distance from the above NTN node to the ground geographical location reference point, or by other representation methods, and specific limitations are not made here. The EPRE offset included in Table 5 can be represented by the distance from the above NTN node to the ground geographical location reference point, or by other representation methods, and specific limitations are not made here.

[0100] In one implementation, the broadcast information further includes an emergency requirement level. When some ground geographical location areas send emergency events, such as fires, floods or earthquakes, more SSB power needs to be allocated to these areas. Therefore, the broadcast information further includes different emergency requirement levels, as shown in Table 6 specifically:

[0101] Table 6

[0102]

[0103] As shown in Table 6, the broadcast information sent by the NTN node to the terminal device includes the mapping relationship between the ground geographical location area and the emergency requirement level and SSB EPRE of this area. The broadcast information includes the EPRE values corresponding to the ground geographical location area under different emergency requirement levels.

[0104] In practical applications, the broadcast message may also include a preset EPRE. The target parameter may be an EPRE scaling factor, an EPRE offset, or other EPRE-related parameters, which are not specifically limited here. It can be understood that the EPRP in Table 6 above can be replaced with an EPRE scaling factor, an EPRE offset, or other EPRE-related parameters.

[0105] 302. The NTN node sends ephemeris information to the terminal device;

[0106] The NTN node also sends ephemeris information to the terminal device for the terminal device to determine the coordinates, speed, or orbit of the NTN node. The ephemeris information can accurately calculate, predict, depict, and track the operating states of a satellite, such as time, position, and speed, and can express the accurate parameters of celestial bodies, satellites, or spacecraft and other flying objects.

[0107] It can be understood that in this embodiment, when the ground geographical location area is represented by reference coordinates, the terminal device can determine the ground geographical location area without relying on ephemeris information, so step 302 may not be executed.

[0108] 303. The terminal device determines the target area;

[0109] When the ground geographical location area is represented by reference coordinates, the terminal device determines the longitude and latitude coordinates where the terminal device is located according to its own GNSS. The terminal device determines the target area where the terminal device is located according to its own coordinates and the ground geographical location area information shown in Table 2. For example, if the coordinates of the terminal device are 120.1°E, 30°N, and the distance from this coordinate to the center point of Area 1 is approximately 9.6 kilometers, which is less than the radius of Area 1, so Area 1 is the target area.

[0110] In practical applications, the coordinates of the terminal device or the reference point of the ground geographical location area can both be represented by coordinates in the Earth coordinate system. Here, the geographical coordinates of the terminal device are taken as an example. Similarly, the representation of the geographical coordinates of the reference point of the ground geographical location area can be implemented by referring to the representation of the geographical coordinates of the terminal device.

[0111] The geographical coordinates of the terminal device can be expressed as where represents the longitude information of the terminal device, and θ represents the latitude information of the terminal device. The position information of the terminal device in the Earth coordinate system and the geographical coordinates satisfy:

[0112] x u = r * sin(φ) * cos(θ)

[0113] y u = r * sin(φ) * sin(θ)

[0114] zu = r * cos(φ)

[0115] where x u is the coordinate of the terminal device on the x-axis in the Earth coordinate system, y u is the coordinate of the terminal device on the y-axis in the Earth coordinate system, z u is the coordinate of the terminal device on the z-axis in the Earth coordinate system. The position information of the terminal device in the Earth coordinate system can be expressed as (x u , y u , z u ), and r is the radius of the Earth.

[0116] When the ground geographical location area is represented by the elevation angle and azimuth angle of the area relative to the NTN node, the terminal device determines the elevation angle and azimuth angle of the terminal device relative to the NTN node according to the GNSS and ephemeris information. The terminal device determines the target area where the terminal device is located according to the elevation angle and azimuth angle of itself relative to the NTN node and the ground geographical location area information shown in Table 3. For example, the azimuth angle of the terminal device relative to the NTN node is 86°, and the elevation angle is 29°. The terminal device calculates the distance to the center point of Area 2 according to these two angles, and this distance is less than the radius of Area 2, then the terminal device determines Area 2 as the target area.

[0117] 304. The terminal device obtains the corresponding target parameter;

[0118] After the terminal device determines the target area, it obtains the value of the target parameter corresponding to the target area from the broadcast information. For example, when the target parameter is EPRE, the terminal device obtains the EPRE corresponding to the target area from Table 1 according to the target area. If the target area is Area 1, the EPRE value is 10 dBm.

[0119] Optionally, 305. The terminal device calculates the downlink path loss;

[0120] The terminal device calculates the SSB power and RSRP obtained to get the downlink path loss.

[0121] Optionally, 306. The terminal device sends the downlink path loss to the NTN node;

[0122] The terminal device reports the calculated downlink path loss to the NTN node through RRC signaling. In practical applications, the terminal device can also report the calculation result to the NTN node through dedicated signaling or other signaling, which is not specifically limited here.

[0123] In this embodiment, steps 305 to 306 may or may not be executed, which is not specifically limited here.

[0124] In the embodiments of the present application, by broadcasting the mapping relationship between the SSB power and the ground geographical location area in the NTN network, the terminal device calculates the path loss according to the SSB power in the geographical area where it is currently located. Therefore, the satellite SSB power can be dynamically adjusted according to the ground coverage geographical location area, improving the coverage performance.

[0125] The communication method in the embodiments of the present application has been described above. Next, the communication device in the embodiments of the present application will be described. Please refer to Figure 6 , in the embodiments of the present application, the communication device can be a terminal device, or a component or device applied to the terminal device (such as a processor, a chip, or a chip system, etc.), or a logical module or software that can implement all or part of the functions of the terminal device, and can implement the functions of the terminal device in the above method. An embodiment of the communication device includes:

[0126] A receiving unit 601, configured to receive broadcast information, where the broadcast information includes the values of a target parameter corresponding to one or more ground geographical location areas;

[0127] An obtaining unit 602, configured to obtain a first value according to a target area and the broadcast information, where the target area is the ground geographical location area where the terminal device is located, and the first value is the value of the target parameter corresponding to the target area, and the first value is used to indicate the power of the synchronization signal corresponding to the target area.

[0128] Please refer to Figure 7 , in the embodiments of the present application, the communication device can be an NTN node, or a component applied to the NTN node (such as a processor, a chip, or a chip system, etc.), or a logical module or software that can implement all or part of the functions of the NTN node, and can implement the functions of the NTN node in the above method. An embodiment of the communication device includes:

[0129] A sending unit 701, configured to send broadcast information, where the broadcast information includes the values of a target parameter corresponding to one or more ground geographical location areas, and the values are used to indicate the power of the synchronization signals corresponding to the one or more ground geographical location areas.

[0130] Next, a communication device provided in the embodiments of the present application will be introduced. Please refer to Figure 8 , Figure 8 is a schematic structural diagram of a communication device provided in the embodiments of the present application. The communication device can be the terminal device or the network device in the above method embodiments, or a chip, a chip system, or a processor that supports the terminal device or the network device to implement the above method. The communication device can be used to implement the method described in the above method embodiments, and specifically, reference can be made to the description in the above method embodiments.

[0131] The communication device may include one or more processors 801, and the processor 801 is connected to a memory 802, an input / output unit 803, and a bus 804. The processor 801 may be a general-purpose processor or a dedicated processor, etc. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process the communication protocol and the communication data, and the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal, a terminal chip, a DU or a CU, etc.), execute a software program, and process the data of the software program.

[0132] Optionally, the communication device may include one or more memories 802, on which instructions may be stored, and the instructions may be executed on the processor 801, so that the communication device performs the method described in the above method embodiment. Optionally, data may also be stored in the memory 802. The processor 801 and the memory 802 may be provided separately or integrated together.

[0133] Optionally, the communication device may further include a transceiver and an antenna. The transceiver may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., for implementing a transceiver function. The transceiver may include a receiver and a transmitter, the receiver may be referred to as a receiver or a receiving circuit, etc., for implementing a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing a transmitting function.

[0134] In another possible design, the processor 801 may include a transceiver for implementing the receiving and sending functions. For example, the transceiver may be a transceiver circuit, or an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing the receiving and sending functions may be separate or integrated. The above-mentioned transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or the above-mentioned transceiver circuit, interface, or interface circuit may be used for transmitting or delivering signals.

[0135] In another possible design, optionally, the processor 801 may store instructions, and the instructions run on the processor 801, which may enable the communication device to perform the method described in the above method embodiment. The instructions may be solidified in the processor 801, in which case the processor 801 may be implemented by hardware.

[0136] In another possible design, the communication device may include a circuit, which may implement the sending, receiving, or communication functions of the communication device or the first terminal device in the foregoing method embodiments. The processor and transceiver described in the embodiments of the present application may be implemented on an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFIC), a mixed-signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver may also be fabricated using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), metal-oxide-semiconductor (MOS), positive channel metal oxide semiconductor (PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0137] The communication device described in the above embodiments may be a terminal device or a network device, but the scope of the communication device described in the embodiments of the present application is not limited thereto, and the structure of the communication device may not be subject to Figure 8 restrictions. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be:

[0138] (1) An independent integrated circuit (IC), or chip, or chip system or subsystem;

[0139] (2) A set of one or more ICs, optionally, the IC set may also include a storage component for storing data and instructions;

[0140] (3) An ASIC, such as a modem (MSK);

[0141] (4) A module that can be embedded in other devices;

[0142] (5) A receiver, a terminal, a smart terminal, a cellular phone, a wireless device, a handset, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.;

[0143] (6) Others, etc.

[0144] For the case where the communication device can be a chip or a chip system, refer to Figure 9 the structural schematic diagram of the chip shown. Figure 9 The chip 900 shown includes a processor 901 and an interface 902. Optionally, a memory 903 may also be included. Among them, the number of processors 901 can be one or more, and the number of interfaces 902 can be multiple.

[0145] For the case where the chip is used to implement the functions of the network device or the terminal device in the embodiments of the present application:

[0146] The interface 902 is used to receive or output signals;

[0147] The processor 901 is used to perform data processing operations of the network device or the terminal device.

[0148] It can be understood that some optional features in the embodiments of the present application can, in some scenarios, be implemented independently without relying on other features, such as the current scheme it is based on, to solve the corresponding technical problems and achieve the corresponding effects. In some scenarios, they can also be combined with other features according to requirements. Correspondingly, the communication devices given in the embodiments of the present application can also implement these features or functions accordingly, which will not be elaborated here.

[0149] It should be understood that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit in the hardware of the processor or instructions in software form. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0150] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include but not be limited to these and any other suitable types of memory.

[0151] The embodiments of the present application further provide a computer-readable storage medium, including instructions, which when running on a computer, cause the computer to execute the method in the foregoing embodiments.

[0152] The embodiments of the present application further provide a computer program product containing instructions, which when running on a computer, cause the computer to execute the method in the foregoing embodiments.

[0153] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0154] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0155] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0156] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0157] If the above-mentioned 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 computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. And the aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, read-only memory), random access memories (RAM, random access memory), magnetic disks, or optical discs that can store program codes.

[0158] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a high-density digital video disc (DVD)), or a semiconductor medium (such as a solid state disk (SSD)), etc.

Claims

1. A communication method, characterized in that, the method includes: receiving broadcast information, where the broadcast information includes the values corresponding to the target parameter in one or more terrestrial geographical location areas; obtaining a first value according to the target area and the broadcast information, where the target area is the terrestrial geographical location area where the terminal device is located, and the first value is the value corresponding to the target parameter in the target area, and the first value is used to indicate the power of the synchronization signal corresponding to the target area.

2. The communication method according to claim 1, characterized in that, the method further includes: receiving ephemeris information; obtaining a first value according to the target area and the broadcast information, including: determining the target area according to the ephemeris information, the terrestrial position information of the terminal device, and the terrestrial geographical location area information; obtaining the first value from the broadcast information according to the target area.

3. The communication method according to claim 1 or 2, characterized in that, the terrestrial geographical location area is represented by a reference coordinate.

4. The communication method according to claim 2, characterized in that, the terrestrial geographical location area is represented by the elevation angle and azimuth angle of the NTN node relative to the terrestrial geographical location area.

5. The communication method according to any one of claims 1 to 4, characterized in that, the target parameter is the energy per resource element EPRE, a scaling factor, or an offset.

6. The communication method according to any one of claims 1 to 5, characterized in that, the broadcast information further includes a second value, where the second value is a preset value, and the first value is used for the terminal device to calculate the power of the synchronization signal corresponding to the target area according to the second value.

7. The communication method according to any one of claims 1 to 6, characterized in that, the broadcast information further includes an emergency requirement level; the broadcast information includes the values corresponding to the target parameter in one or more terrestrial geographical location areas, including the broadcast information includes the values corresponding to the target parameter in the one or more terrestrial geographical location areas under different emergency requirement levels.

8. The communication method according to any one of claims 1 to 7, characterized in that, the method further includes: calculating the downlink path loss according to the first value; sending the downlink path loss to a non-terrestrial network NTN node.

9. The communication method according to any one of claims 1 to 8, characterized in that, the method further includes: receiving a synchronization signal and a PBCH block from the NTN node.

10. A communication method, characterized in that, the method includes: sending broadcast information, where the broadcast information includes the values corresponding to the target parameter in one or more terrestrial geographical location areas, and the values are used to indicate the power of the synchronization signal corresponding to the one or more terrestrial geographical location areas.

11. The communication method according to claim 10, characterized in that, the method further includes: sending ephemeris information, where the ephemeris information is used for the terminal device to determine the target area, and the target area is the terrestrial geographical location area where the terminal device is located.

12. The communication method according to claim 10 or 11, characterized in that, the ground geographical location area is represented by reference coordinates.

13. The communication method according to claim 11, characterized in that, the ground geographical location area is represented by the elevation angle and azimuth angle of the NTN node relative to the ground geographical location area.

14. The communication method according to any one of claims 10 to 13, characterized in that, the target parameter is the energy per resource element EPRE, a scaling factor or an offset.

15. The communication method according to any one of claims 10 to 13, characterized in that, the broadcast information further includes a second value, the second value being a preset value, and the first value is used for the terminal device to calculate the power of the synchronization signal corresponding to the target area according to the second value.

16. The communication method according to any one of claims 10 to 15, characterized in that, the broadcast information further includes an emergency requirement level; the broadcast information includes the corresponding values of the target parameter in one or more ground geographical location areas, including the broadcast information includes the corresponding values of the target parameter in different emergency requirement levels in the one or more ground geographical location areas.

17. The communication method according to any one of claims 10 to 16, characterized in that, the method further includes: receiving the downlink path loss.

18. The communication method according to any one of claims 10 to 17, characterized in that, the method further includes: sending a synchronization signal and a PBCH block to the terminal device.

19. A communication device, characterized in that, it includes a module or unit for executing the method according to any one of claims 1 to 9.

20. A communication device, characterized in that, it includes a module or unit for executing the method according to any one of claims 10 to 18.

21. A communication device, characterized in that, it includes: a processor for executing a program, so that the communication device executes the method according to any one of claims 1 to 9.

22. A communication device, characterized in that, it includes: a processor for executing a program, so that the communication device executes the method according to any one of claims 10 to 18.

23. A communication system, characterized in that, it includes: a communication device for executing the method according to any one of steps 1 to 9, and a communication device for executing the method according to any one of claims 10 to 18.

24. A computer-readable storage medium, including instructions, when the instructions are run on a computer, cause the computer to execute the method according to any one of claims 1 to 9, or cause the computer to execute the method according to any one of claims 10 to 18.

25. A computer program product containing instructions, when it runs on a computer, causes the computer to execute the method according to any one of claims 1 to 9, or causes the computer to execute the method according to any one of claims 10 to 18.

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