Communication method and communication apparatus

Abstract

A communication method and a communication apparatus. The communication method comprises: a first communication device in an NTN receiving a first threshold and a first condition, and when the first condition is met, determining first uplink transmit power on the basis of the first threshold, a subcarrier width, and a sequence length of a preamble, wherein the first uplink transmit power is transmit power for transmitting the preamble. It can be understood that a network device controls uplink transmit power of a first communication device by means of transmitting a first threshold, and when determining the uplink transmit power, the first communication device takes a sequence length of a preamble into account, that is, uplink transmit power corresponding to sequence lengths of different preambles can be determined on the basis of the same first threshold, such that it is not necessary for the network device to configure different thresholds for sequence lengths of different preambles, thereby avoiding parameter redundancy.

Description

Communication methods and communication devices Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a communication method and a communication device. Background Technology

[0002] Compared to terrestrial communications, non-terrestrial networks (NTNs) offer advantages such as large coverage areas and flexible networking, enabling seamless global network coverage. NTN networks can supplement existing terrestrial networks or be viewed as an independent communication system providing users with high-speed global network access. NTN communications include networking using equipment such as drones, high-altitude platforms, or satellites to provide data transmission or voice communication services to terminals. Specifically, signals emitted by satellite systems can cause strong interference once they enter the receiving beam of a radio telescope. Due to the high receiving sensitivity of radio telescopes, even a small amount of energy from a satellite beam can interfere with radio telescope observations. Radio protection zones are established around radio telescopes, and uplink (UL) power control is implemented for terminal equipment within these zones.

[0003] Currently, in cellular networks, power control parameters can be configured at the cell level to minimize uplink power for preamble transmission by terminal devices, thus avoiding interference with radio telescopes. However, for the Physical Random Access Channel (PRACH) through which terminal devices transmit preambles, different preamble lengths correspond to different power control parameters, potentially leading to parameter redundancy. Furthermore, current uplink power control schemes in cellular networks are cell-level, meaning they control uplink power for all terminal devices within the cell, which may impact communication performance.

[0004] Therefore, how to control the uplink power of terminal devices while improving communication performance and reducing parameter redundancy has become an urgent problem to be solved.

[0005] Summary of the Invention

[0006] This application provides a communication method for controlling the uplink power of a terminal device while improving communication performance and reducing parameter redundancy.

[0007] Firstly, a communication method is provided. This method can be executed by a first communication device. Unless otherwise specified, the "first communication device" in this application can refer to the first communication device itself (e.g., a terminal device), or a component within the first communication device (e.g., a processor, chip, or chip system, such as a circuit or chip in a terminal device responsible for communication functions (e.g., a modem chip, also known as a baseband chip, or a system-on-chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip)). Alternatively, it can be a logic module or software capable of implementing all or part of the functions of the first communication device. For ease of description, the following explanation uses execution by a first communication device as an example.

[0008] The communication method includes: receiving a first threshold and a first condition, wherein the first threshold is the maximum power spectral density (PSD) of the Physical Random Access Channel (PRACH), and the first condition includes location information. If a first communication device satisfies the first condition, a first uplink transmission power is determined based on the first threshold, the subcarrier width, and the sequence length of the preamble, wherein the first uplink transmission power is the transmission power for transmitting the preamble; wherein the subcarrier width is the subcarrier width of the PRACH. The first communication device is a device in an NTN (Network Node Network), for example, a terminal device communicating with an NTN device.

[0009] Based on the above technical solution, the first communication device can determine the transmission power of the preamble based on the received first threshold, subcarrier width, and preamble sequence length. That is, the network device controls the uplink transmission power of the first communication device by sending the first threshold. In the process of determining the uplink transmission power, the first communication device considers the preamble sequence length. That is, different preamble sequence lengths can determine their corresponding uplink transmission power based on a unified first threshold. The network device does not need to configure different first thresholds for different preamble sequence lengths, thereby avoiding parameter redundancy and realizing the control of the uplink power of the first communication device under the premise of reducing parameter redundancy.

[0010] In addition, the first communication device can determine the uplink transmission power based on the received first condition and control it based on the first threshold if the first condition is met. That is, if the first condition is not met, the first communication device does not need to control the uplink transmission power based on the first threshold. It can adopt a more refined power control scheme to avoid unnecessary restrictions on the uplink transmission power of the first communication device and achieve control of the uplink power of the first communication device while improving communication performance.

[0011] For example, the first condition includes location information. When the first communication device is within the location range indicated by the location information, the first communication device controls the uplink transmission power based on the first threshold. When the first communication device is not within the location range indicated by the location information, the first communication device does not control the uplink transmission power based on the first threshold.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the first condition further includes at least one of the following: time period information for transmitting the preamble, frequency point information of the PRACH for transmitting the preamble, polarization direction information of the PRACH for transmitting the preamble, or beam direction information for transmitting the preamble.

[0013] Based on the above technical solution, the first condition can also constrain the time period for transmitting the preamble, the frequency of the PRACH for transmitting the preamble, the polarization direction of the PRACH, or the beam direction for transmitting the preamble, etc. That is, when the first communication device meets the conditions indicated by the first condition, the first communication device controls the uplink transmission power based on the above-mentioned first threshold. When the first condition is not met, the first communication device does not need to control the uplink transmission power based on the first threshold. There are various ways to implement the first condition, which improves the precision of the uplink power control scheme. Fine-grained uplink power control avoids interference from the first communication device to other devices while reducing the impact on the communication capability of the first communication device itself.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, receiving the first threshold and the first condition includes: receiving the first threshold and the first condition from the second communication device, wherein the PRACH is the PRACH of the second cell, the second cell is a cell served by the third communication device, and the second cell is adjacent to the first cell served by the second communication device; the method further includes: sending the preamble to the third communication device based on the first uplink transmission power.

[0015] Based on the above technical solution, the first threshold and the first condition received by the first communication device can be used to control the uplink power of the neighboring cell, thereby realizing uplink transmission power control in the handover scenario.

[0016] In conjunction with the first aspect, in some implementations of the first aspect, receiving the first threshold and the first condition includes: receiving the first threshold and the first condition from the second communication device, wherein the PRACH is the PRACH of the first cell, and the first cell is the cell served by the second communication device; the method further includes: sending the preamble to the second communication device based on the first uplink transmission power.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the location indicated by the location information is associated with the location of the radio telescope.

[0018] Based on the above technical solution, its application scenario can be: a scenario where satellites or ground relay equipment and radio telescopes "coexist." The location indicated by the location information included in the first condition can be associated with the location of the radio telescope. For example, the location indicated by the location information may be within the protection zone of the radio telescope, or the distance between the location indicated by the location information and the location of the radio telescope may be less than a preset threshold. By controlling the uplink transmission power of the first communication device, interference from the first communication device to the radio telescope can be reduced.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, determining the first uplink transmit power based on the first threshold, the subcarrier width, and the preamble sequence length includes: calculating a third uplink transmit power based on the first threshold, the subcarrier width, and the preamble sequence length; determining the first uplink transmit power based on the third uplink transmit power and the second uplink transmit power, wherein the second uplink transmit power is determined based on the target receive power of the PRACH, the output power of the first communication device, and the path loss corresponding to the PRACH.

[0020] Based on the above technical solution, in the process of determining the first uplink transmission power based on the first threshold, the first communication device can determine the second uplink transmission power based on the current scheme for determining the uplink transmission power, and after correcting the second uplink transmission power based on the first threshold, the actual uplink transmission power can be obtained. This can be integrated with the current scheme for determining the uplink transmission power, providing compatibility with the technical solution.

[0021] In conjunction with the first aspect, in certain implementations of the first aspect, the first threshold, the subcarrier width, the sequence length of the preamble, and the third uplink transmit power satisfy the following formula: P RACH3 =PSD MAX ×SCS×L preamble Or, P RACH3 =PSD MAX +10log 10 (SCS)+10log 10 (L preamble ), wherein, the P RACH3 This indicates the third uplink transmit power, and the PSD MAX The first threshold is represented by L, the SCS represents the subcarrier width, and L represents the first threshold. preamble This indicates the sequence length of the preamble.

[0022] Based on the above technical solution, the first communication device can calculate the third uplink transmission power in multiple ways based on the first threshold, the subcarrier width, and the sequence length of the preamble, thereby improving the flexibility of the solution.

[0023] In conjunction with the first aspect, in certain implementations of the first aspect, the target received power of the PRACH, the output power of the first communication device, the path loss corresponding to the PRACH, and the second uplink transmit power satisfy the following formula: P RACH2 =min{P CMAX P RACH,target +PL}, where P RACH2 This indicates the second uplink transmission power, and the P CMAX P represents the output power of the first communication device. RACH,target The target received power of the PRACH is represented by PL, and the path loss corresponding to the PRACH is represented by PL.

[0024] In conjunction with the first aspect, in some implementations of the first aspect, the third uplink transmission power, the second uplink transmission power, and the first uplink transmission power satisfy the following formula: P RACH1 =min{P RACH2 P RACH3}, wherein the P RACH3 This indicates the third uplink transmission power, and P RACH2 This indicates the second uplink transmission power.

[0025] Secondly, a communication method is provided. This method can be executed by a second communication device. Unless otherwise specified, the "second communication device" in this application can refer to the second communication device itself (e.g., an access mobility management network element), or a component within the second communication device (e.g., a processor, chip, or chip system, such as a circuit or chip in a terminal device responsible for communication functions (e.g., a modem chip, also known as a baseband chip, or a SoC chip or SIP chip containing a modem core)), or a logic module or software capable of implementing all or part of the functions of the second communication device. For ease of description, the following description uses the execution by a second communication device as an example.

[0026] The communication method includes: determining a first threshold and a first condition, wherein the first threshold is the maximum power spectral density (PSD) of the Physical Random Access Channel (PRACH), and the first condition includes location information; sending the first threshold and the first condition to a first communication device, wherein if the first communication device satisfies the first condition, the first threshold, the subcarrier width, and the sequence length of the preamble are used to determine a first uplink transmission power, wherein the first uplink transmission power is the transmission power for transmitting the preamble, and the subcarrier width is the subcarrier width of the PRACH.

[0027] In conjunction with the second aspect, in some implementations of the second aspect, the first condition further includes at least one of the following: time period information for transmitting the preamble, frequency point information of the PRACH for transmitting the preamble, polarization direction information of the PRACH for transmitting the preamble, or beam direction information for transmitting the preamble.

[0028] In conjunction with the second aspect, in some implementations of the second aspect, the PRACH is the PRACH of a second cell, which is a cell adjacent to the first cell served by the second communication device.

[0029] In conjunction with the second aspect, in some implementations of the second aspect, the PRACH is the PRACH of the first cell served by the second communication device; the method further includes: receiving the preamble from the first communication device.

[0030] In conjunction with the second aspect, in some implementations of the second aspect, the location indicated by the location information is associated with the location of the radio telescope.

[0031] In conjunction with the second aspect, in some implementations of the second aspect, the first threshold, the subcarrier width, and the preamble sequence length are used to determine the first uplink transmit power, including: the first threshold, the subcarrier width, and the preamble sequence length are used to calculate a third uplink transmit power; the third uplink transmit power and the second uplink transmit power are used to determine the first uplink transmit power, wherein the second uplink transmit power is determined based on the target receive power of the PRACH, the output power of the first communication device, and the path loss corresponding to the PRACH.

[0032] In conjunction with the second aspect, in some implementations of the second aspect, the first threshold, the subcarrier width, the sequence length of the preamble, and the third uplink transmit power satisfy the following formula: P RACH3 =PSD MAX ×SCS×L preamble Or, P RACH3 =PSD MAX+10log 10 (SCS)+10log 10 (L preamble ), wherein, the P RACH3 This indicates the third uplink transmit power, and the PSD MAX The first threshold is represented by L, the SCS represents the subcarrier width, and L represents the first threshold. preamble This indicates the sequence length of the preamble.

[0033] In conjunction with the second aspect, in some implementations of the second aspect, the target received power of the PRACH, the output power of the first communication device, the path loss corresponding to the PRACH, and the second uplink transmit power satisfy the following formula: P RACH2 =min{P CMAX P RACH,target +PL}, where P RACH2 This indicates the second uplink transmission power, and the P CMAX P represents the output power of the first communication device. RACH,target The target received power of the PRACH is represented by PL, and the path loss corresponding to the PRACH is represented by PL.

[0034] In conjunction with the second aspect, in some implementations of the second aspect, the third uplink transmission power, the second uplink transmission power, and the first uplink transmission power satisfy the following formula: P RACH1 =min{P RACH2 P RACH3}, wherein the P RACH3 This indicates the third uplink transmission power, and P RACH2 This indicates the second uplink transmission power.

[0035] The technical effects of the methods shown in the second aspect above can be referenced in the first aspect and its possible designs.

[0036] Thirdly, a communication device is provided for performing the method provided in the first aspect. Specifically, the communication device may include units and / or modules for performing the method provided in any of the above implementations of the first aspect, such as a processing unit and an acquisition unit.

[0037] In one implementation, the transceiver unit can be a transceiver or an input / output interface; the processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0038] In another implementation, the transceiver unit can be an input / output interface, interface circuit, output circuit, input circuit, pin, or related circuit on the chip, chip system, or circuit; the processing unit can be at least one processor, processing circuit, or logic circuit.

[0039] Fourthly, a communication apparatus is provided for performing the method provided in the second aspect. Specifically, the communication apparatus may include units and / or modules for performing the method provided in the second aspect, such as a processing unit and an acquisition unit.

[0040] In one implementation, the transceiver unit can be a transceiver or an input / output interface; the processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0041] In another implementation, the transceiver unit can be an input / output interface, interface circuit, output circuit, input circuit, pin, or related circuit on the chip, chip system, or circuit; the processing unit can be at least one processor, processing circuit, or logic circuit.

[0042] Fifthly, this application provides a communication device, the communication device including at least one processor for executing the method provided in any of the implementations of the first and second aspects above.

[0043] Unless otherwise specified, or if it does not contradict its actual function or internal logic in the relevant description, the transmission and acquisition / reception operations involved in the processor can be understood as processor output and reception, input and other operations, or as transmission and reception operations performed by radio frequency circuits and antennas. This application does not limit them in this regard.

[0044] A sixth aspect provides a computer-readable storage medium storing program code for execution by a device, the program code including a method for performing any of the implementations of the first and second aspects described above.

[0045] In a seventh aspect, a computer program product comprising instructions is provided, which, when run on a computer, causes the computer to perform the method provided by any of the implementations of the first and second aspects described above.

[0046] Eighthly, a chip or chip system is provided, the chip or chip system including one or more processors and a communication interface, wherein the processor reads a computer program or instructions stored in a memory through the communication interface and executes the method provided by any of the implementations of the first and second aspects above.

[0047] Optionally, as one implementation, the chip also includes a memory storing computer programs or instructions, and a processor for executing the computer programs or instructions stored in the memory. When the computer programs or instructions are executed, the processor is used to perform the methods provided by any of the first and second aspects described above.

[0048] Ninth aspect, a communication system is provided, including the communication device described in the third aspect and the communication device described in the fourth aspect. Attached Figure Description

[0049] Figure 1 is a schematic diagram of the network architecture applicable to the embodiments of this application.

[0050] Figure 2 is a schematic diagram of the open radio access network (O-RAN) architecture.

[0051] Figure 3 is a schematic diagram of a satellite communication scenario applicable to an embodiment of this application.

[0052] Figure 4 is a schematic diagram of another satellite communication scenario applicable to the embodiments of this application.

[0053] Figure 5 is a schematic diagram of a transparent satellite architecture.

[0054] Figure 6 is a schematic diagram of a non-transparent satellite architecture.

[0055] Figure 7 is a schematic diagram of a cell coverage area.

[0056] Figure 8 is a schematic flowchart of a communication method provided in an embodiment of this application.

[0057] Figure 9 is a schematic block diagram of a communication device provided in an embodiment of this application.

[0058] Figure 10 is a schematic diagram of another communication device provided in an embodiment of this application. Detailed Implementation

[0059] To facilitate understanding of the embodiments of this application, the following points will be explained first.

[0060] First, in this application, "for indicating" can include both direct and indirect indication. When describing an indication message as indicating A, it can include whether the indication message directly indicates A or indirectly indicates A, but does not necessarily mean that the indication message carries A.

[0061] The information indicated by the instruction is called the information to be instructed. In the specific implementation process, there are many ways to indicate the information to be instructed, such as, but not limited to, directly indicating the information to be instructed, such as the information to be instructed itself or its index. It can also be indirectly indicated by indicating other information, where there is a relationship between the other information and the information to be instructed. It can also indicate only a part of the information to be indicated, while the other parts are known or pre-agreed upon. For example, the instruction of specific information can be achieved by using a pre-agreed (e.g., protocol-defined) arrangement of various pieces of information, thereby reducing instruction overhead to some extent. At the same time, common parts of various pieces of information can be identified and indicated uniformly to reduce the instruction overhead caused by individually indicating the same information.

[0062] Second, in this application, "at least one" refers to one or more, and "more than one" refers to two or more. Furthermore, in the embodiments of this application, "first," "second," and various numerical designations (e.g., "#1," "#2," etc.) are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The sequence numbers of the processes below do not imply an order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. It should be understood that the objects described in this way can be interchanged where appropriate to describe solutions other than those in the embodiments of this application. Moreover, in the embodiments of this application, terms such as "S810" are merely identifiers for descriptive convenience and do not limit the order of execution steps.

[0063] Third, in the embodiments of this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0064] Fourth, the term "storage" in the embodiments of this application can refer to storage in one or more memories. These memories can be separate installations or integrated into an encoder, decoder, processor, or communication device. Alternatively, some memories can be separately installed, while others can be integrated into the decoder, processor, or communication device. The type of memory can be any form of storage medium, and this application does not limit this.

[0065] Fifth, in the implementation of this application, "protocol" may refer to standard protocols in the field of communications, such as New Radio (NR) protocols and related protocols applied in future communication systems, which are not limited in this application.

[0066] Sixth, in the embodiments of this application, the terms "of", "corresponding (relevant)", "corresponding", and "associate" can sometimes be used interchangeably. It should be noted that when their differences are not emphasized, their intended meanings are consistent.

[0067] Seventh, in the embodiments of this application, "under the circumstances", "when", and "if" can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, their intended meanings are consistent.

[0068] Eighth, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0069] Ninth, in the embodiments of this application, the names of messages and devices are merely examples. This application does not impose any limitations on message names, device names, etc., as long as they can achieve the corresponding functions.

[0070] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0071] The technical solutions of this application can be applied to satellite communication systems, high altitude platform station (HAPS) communication, and non-terrestrial network (NTN) systems such as unmanned aerial vehicles (UAVs). Examples include integrated communication and navigation (ICAN) systems, global navigation satellite systems (GNSS), and ultra-dense low-Earth orbit (LEO) satellite communication systems. Satellite communication systems can be integrated with traditional mobile communication systems. For example, the mobile communication system can be a 4th generation (4G) communication system (e.g., Long Term Evolution (LTE) system), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) communication system (e.g., new radio (NR) system), and future mobile communication systems.

[0072] Figure 1 shows a schematic diagram of a communication system applicable to embodiments of this application. The communication system includes at least one network device and at least one terminal. Terminals include ground-based mobile terminals, drones, etc. Both network devices and terminals are sometimes referred to as communication devices; for example, the network device in Figure 1 can be understood as a communication device with base station functionality, and the terminal can be understood as a communication device with terminal functionality.

[0073] It should be understood that Figure 1 is a simplified illustration of a communication scenario in which this application can be applied, using examples of communication between an access network device and a terminal device, and between an access network device and a core network device. It does not limit other scenarios in which this application can be applied. It should also be understood that Figure 1 is only a simplified schematic diagram for ease of understanding. This communication system may also include other network devices or other terminal devices, which are not shown in Figure 1.

[0074] The terminal in this application embodiment can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, smart cities, etc. Terminals can be mobile phones, tablets, computers with wireless transceiver capabilities, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. Terminals typically contain communication modules, circuits, or chips that perform corresponding communication functions. The terminal can also be configured with program instructions for performing these communication functions.

[0075] The network devices in this application embodiment may sometimes be referred to as access network devices, open radio access network (RAN) entities, or access nodes, etc., constituting part of the communication system to help terminals achieve wireless access. The communication system may include multiple network devices, which may be nodes of the same type or nodes of different types.

[0076] In one possible scenario, network equipment can be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation NodeB (gNB), a base station in a future mobile communication system, or an access node in a WiFi system. Network equipment can be a macro base station, a micro base station or indoor station, a relay node or donor node, or a wireless controller. Optionally, network equipment can also be a server, wearable device, vehicle, or in-vehicle equipment. For example, the access network equipment in vehicle-to-everything (V2X) technology can be a roadside unit (RSU).

[0077] In another possible scenario, multiple network devices collaborate to assist terminals in achieving wireless access, with each device performing a portion of the base station's functions. For example, these network devices could be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be configured separately or included in the same network element, such as the baseband unit (BBU). The CU and DU nodes separate the gNB's protocol layers; some protocol layer functions are centrally controlled by the CU, while the remaining partial or complete protocol layer functions are distributed across the DU, which is centrally controlled by the CU.

[0078] The CU is deployed with the radio resource control (RRC) layer, the packet data convergence protocol (PDCP) layer, and the service data adaptation protocol (SDAP) layer in the protocol stack; the DU is deployed with the radio link control (RLC) layer, the media access control (MAC) layer, and the physical layer (PHY) in the protocol stack.

[0079] The CU has RRC, PDCP, and SDAP processing capabilities. The DU has RLC, MAC, and PHY processing capabilities.

[0080] It should be understood that the above functional division (or segmentation) is merely an example and does not constitute a limitation on CU and DU in this application. That is to say, there may be other ways to divide functions between CU and DU, and the embodiments of this application do not limit this.

[0081] The functions of a CU can be implemented by a single entity or by different entities. For example, the functions of a CU can be further divided, such as separating the control plane (CP) and the user plane (UP), i.e., the CU control plane (CU-CP) and the CU user plane (CU-UP). CU-CP and CU-UP can be implemented by different functional entities, and they can be coupled with DUs to jointly complete the functions of the network device. The CU control plane CU-CP can also include a further divided architecture, namely, dividing CU-CP into CU-CP1 and CU-CP2. CU-CP1 includes various radio resource management functions, while CU-CP2 only includes RRC functions and PDCP-control (C) functions (i.e., the basic functions of control plane signaling at the PDCP layer).

[0082] In one possible implementation, CU-CP handles control plane functions, primarily including RRC and PDCP-C. PDCP-C is mainly responsible for control plane data encryption / decryption, integrity protection, and data transmission. CU-UP handles user plane functions, primarily including SDAP and PDCP-user (U). SDAP is mainly responsible for processing core network data and mapping data flows to bearers. PDCP-U is mainly responsible for data plane encryption / decryption, integrity protection, header compression, sequence number maintenance, and data transmission. CU-CP and CU-UP are connected via an E1 interface. CU-CP represents the gNB and connects to the core network via the Ng interface. It connects to the DU via F1-C (control plane). CU-UP connects to the DU via F1-U (user plane). Another possible implementation is that PDCP-C is also located within CU-UP.

[0083] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, a radio access network can also be an open radio access network (O-RAN) architecture. In an ORAN system, CU can also be called an open CU (open CU, O-CU), DU can also be called an open DU (open DU, O-DU), CU-CP can also be called an open CU-CP (open CU-CP, O-CU-CP), CU-UP can also be called an open CU-UP (open CU-UP, O-CU-UP), and RU can also be called an O-RU. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software modules and hardware modules.

[0084] To facilitate understanding, the O-RAN architecture designed in this application is briefly introduced with reference to Figure 2. As can be seen from Figure 2, the O-RAN architecture includes: a first network unit, a second network unit, a third network unit, an O-eNB, an O-CU-CP, an O-CU-UP, an O-DU, an O-RU, and an O-cloud.

[0085] The aforementioned network elements (also referred to as nodes) can be interconnected. For example, the first network unit connects to the O-cloud via the O2 interface; the first network unit connects to the third network unit, O-eNB, O-CU-CP, O-CU-UP, O-DU, and O-RU via the O1 interface; the first network unit connects to the O-RU via the open fronthaul M-Plane interface; the O-DU connects to the O-RU via the open fronthaul M-Plane interface and the open fronthaul C / U / S-Plane interface; the third network unit connects to the O-eNB, O-CU-CP, O-CU-UP, and O-DU via the E2 interface; the O-CU-CP connects to the O-DU via the F1-c interface; the O-CU-UP connects to the O-DU via the F1-u interface; and the O-CU-CP connects to the O-CU-UP via the E1 interface. For a detailed description of the interfaces shown in Figure 2, please refer to existing standards; further details are omitted here.

[0086] One possible example is that the first network unit could be a service management and orchestration framework (SMO), or a network unit with similar functionality to an SMO; there is no limitation on which one.

[0087] One possible example is that the second network element can be a Non-RT RIC, or a network element with similar functionality to a Non-RT RIC; there is no limitation on this.

[0088] One possible example is that the third network unit could be a Near-RT RIC, or a network unit with similar functionality to a Near-RT RIC; there is no limitation on this.

[0089] O-RAN aims to achieve an intelligent and open access network. A key feature of the O-RAN architecture is the separation of hardware and software, enabling the virtualization of network functions and the standardization of hardware. Furthermore, O-RAN incorporates artificial intelligence (AI).

[0090] In the ORAN system, CU can also be called O-CU (Open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules.

[0091] In this embodiment, the communication system may also include core network equipment, i.e., equipment in the core network (CN) that provides service support to the terminal. Examples of core network equipment include: access and mobility management function (AMF) entities, session management function (SMF) entities, user plane function (UPF) entities, etc., which will not be listed here. The AMF entity is responsible for terminal access management and mobility management; the SMF entity is responsible for session management, such as user session establishment; and the UPF entity is a user plane function entity, primarily responsible for connecting to external networks. It should be noted that in this application, entities can also be referred to as network elements or functional entities. For example, an AMF entity can also be called an AMF network element or an AMF functional entity, and an SMF entity can also be called an SMF network element or an SMF functional entity, etc.

[0092] It should be understood that the above naming is defined solely for the purpose of distinguishing different functions and should not constitute any limitation on this application. This application does not preclude the possibility of using other naming conventions in 5G networks and other future networks. For example, in future communication networks, some or all of the above-mentioned network elements may use the terminology from 5G, or they may use other names, etc.

[0093] Currently, 5G has moved from the standardization phase to the commercial deployment phase. The NR standard was designed specifically for terrestrial communication, offering high-speed, high-reliability, and low-latency communication for user terminals. Compared to terrestrial communication, non-terrestrial networks (NTN) communication features large coverage areas and flexible networking. Currently, various research institutes, communication organizations, and companies are involved in researching NTN communication technologies and standards, striving to build a unified communication network integrating air, space, and ground communication. Depending on the payload type, NTN networks commonly employ two architectures: regenerative architecture and transparent architecture.

[0094] For example, the network devices and terminals in Figure 1 are devices in a satellite communication system. For instance, the network devices and terminals are devices in a converged network architecture of NTN and terrestrial networks. For ease of understanding, the satellite communication scenarios to which the solution of this application is applicable will be briefly introduced in conjunction with Figures 3 and 4.

[0095] Figure 3 shows a potential converged network architecture of NTN and terrestrial networks, where the NTN architecture is a transparent architecture, meaning that the base station entities are deployed on the ground.

[0096] Another potential converged network architecture for NTN and terrestrial networks is shown in Figure 4, where the NTN architecture is a regenerative architecture, meaning the base station entity is deployed on NTN equipment. The NTN equipment can be satellite or other non-terrestrial equipment.

[0097] NTN equipment and terrestrial network base stations can interconnect through a shared core network. They can also achieve more timely assistance and interconnection through interfaces defined between base stations. In NR, the interface between base stations is called the Xn interface, and the interface between the base station and the core network is called the NG interface. In a converged network, NTN equipment and terrestrial nodes can communicate with each other through these interfaces.

[0098] This application embodiment can be applied to the satellite communication scenario shown in Figures 3 and 4. In this scenario, the network equipment includes satellite equipment and a gateway station. The user terminal includes an Internet of Things (IoT) terminal, but can also be a terminal of other forms and performance, such as a mobile terminal, a high-altitude aircraft, etc., which is not limited here. The link between the satellite and the user terminal is called a service link, and the link between the satellite and the gateway station is called a feeder link.

[0099] It should be noted that Figures 3 and 4 above are merely examples and do not constitute any limitation on the scope of protection of this application.

[0100] To facilitate understanding of the embodiments of this application, some basic concepts involved in this application will be briefly explained.

[0101] 1. Non-terrestrial networks (NTN): NTN communication involves networking using equipment such as drones, high-altitude platforms, or satellites to provide UE with data transmission, voice communication, and other services. High-altitude platform equipment is generally located at an altitude of 8–50 km above the ground. Based on the satellite's orbital altitude, satellite communication systems can be divided into three types: geostationary earth orbit (GEO) satellite communication systems, also known as synchronous orbit satellite systems; medium earth orbit (MEO) satellite communication systems; and low earth orbit (LEO) satellite communication systems. GEO satellites orbit at an altitude of 35,786 km, and their main advantage is that they remain relatively stationary compared to the ground and provide a large coverage area. However, GEO satellite communication also has significant disadvantages:

[0102] 1) GEO satellites are far from Earth, resulting in high free-space propagation loss and tight communication link budgets. To increase transmit / receive gain, satellites need to be equipped with larger aperture antennas.

[0103] 2) The communication transmission delay is large, reaching about 500ms round-trip delay, which cannot meet the needs of low-latency services;

[0104] 3) GEO orbital resources are relatively scarce, launch costs are high, and it cannot provide coverage for the polar regions of the Earth.

[0105] MEO satellites orbit at altitudes ranging from 2000 to 35786 km. Their advantage lies in achieving global coverage with a relatively small number of satellites. However, their orbital altitude is higher than LEO satellites, resulting in significantly longer transmission latency. Considering both advantages and disadvantages, MEO satellites are primarily used for positioning and navigation. LEO satellites, on the other hand, orbit at altitudes between 300 and 2000 km. Lower than MEO and GEO orbits, LEO satellites offer advantages such as lower data propagation latency, less transmission loss, and lower launch costs. Therefore, LEO satellite communication has gained increasing attention in recent years.

[0106] Furthermore, we note that satellite equipment is limited by manufacturing and launch costs, restricting onboard data processing capabilities and transmission power. Currently, satellite communication networks cannot provide UEs with communication rates comparable to terrestrial communication networks. To overcome these limitations and improve the overall signal processing capabilities and communication throughput of satellite networks, satellite operators are preparing to launch giant low-Earth orbit constellations, compensating for the limitations of individual satellite communication capabilities by increasing the number of satellites. In future NTN communication systems, after a UE accesses the system, it will be "visible" to multiple communicable satellites for a period of time. At this time, multiple satellites can provide communication services to the UE, providing the foundation for multi-satellite collaborative transmission.

[0107] 2. Satellite operating modes: including transparent transmission mode and non-transparent transmission mode. In transparent transmission mode, the signal only undergoes frequency conversion and signal amplification on the satellite, and the satellite is transparent to the signal. In non-transparent transmission mode, the satellite functions as a base station during signal transmission, and the UE can send signals to the 5G core network (CN) through the satellite.

[0108] Alternatively, transparent transmission, also known as bend-tube relay transmission, means that the signal only undergoes frequency conversion and signal amplification on the satellite, and the satellite is transparent to the signal, as if it does not exist. Non-transparent transmission, also known as regeneration (on-board access or processing) transmission, means that the satellite has some or all base station functions (such as a satellite corresponding to a complete base station or DU).

[0109] As an example and not a limitation, satellite communication systems include transparent satellite architecture and non-transparent satellite architecture. In a transparent satellite architecture, the satellite operates in transparent mode, while in a non-transparent satellite architecture, the satellite operates in non-transparent mode. For ease of understanding, the transparent and non-transparent satellite architectures are briefly introduced with reference to Figures 5 and 6. Figure 5 shows the transparent satellite architecture. As can be seen from Figure 5, the signal passes through the satellite and NTN gateway during transmission between the UE and gNB. However, the signal only undergoes frequency conversion and signal amplification on the satellite; the satellite is transparent to the signal. As shown in Figure 5, in the transparent satellite architecture, the satellite and NTN gateway are equivalent to a remote radio unit (RRU). Furthermore, as can be seen from Figure 6, the satellite functions as a base station during signal transmission; the UE can transmit signals to the 5G CN via the satellite.

[0110] 3. Radio telescope: A radio telescope is a specialized antenna and radio receiver used in radio astronomy to receive radio waves from astronomical radio sources in the sky. Radio telescopes vary greatly in shape, ranging from ground-based single-aperture spherical radio telescopes to satellite-like antennas that can rotate in all directions, radio telescope arrays, and radio telescopes made of metal rods, etc. The limiting resolution of an astronomical telescope depends on its aperture and the wavelength used for observation. Larger apertures and shorter wavelengths result in higher resolution.

[0111] Because the signals observed by radio telescopes are very weak, from a communication perspective, a radio telescope is a ground-based receiver with extremely high sensitivity and adjustable receiving direction. It is undesirable for other communication signals on the same frequency to interfere with the direction observed by the radio telescope.

[0112] 4. Interference between cellular systems and radio telescopes: Once the signal emitted by the satellite system enters the receiving beam of the radio telescope, it will cause strong interference. Because the receiving sensitivity of the radio telescope is very high, even a small amount of energy from the satellite beam may interfere with the observation of the radio telescope.

[0113] The Federal Communications Commission (FCC) currently requires feasible methods to prevent radio telescope systems from being interfered with by spaceborne or airborne systems. In such cases, satellites cannot transmit signals at the same frequency as the radio telescope, nor can they transmit signals at adjacent frequencies.

[0114] Specifically, radio protection zones are established around radio telescopes (e.g., a radio protection zone is established within 10 miles of the radio telescope). Within the radio protection zone, the uplink (UL) power of the UE needs to be controlled; for example, the UE's transmit power is typically limited to -3 to 12 dBm within the radio protection zone.

[0115] For example, as shown in Table 1 below, different frequency points impose different UL power limits on the UE.

[0116] Table 1

[0117] 5. Geographical Region: In this application, a geographic region can be understood as a fixed geographic region relative to the Earth. For example, a geographic region may have at least one of the following attributes:

[0118] Shape, outline, size, radius, area, or geographical location, etc.

[0119] Furthermore, a "geographic region" can also have an altitude attribute, meaning that a region can be understood as a geographic area at a given altitude or within a certain altitude range. For example, a geographic region can refer to a geographic area on the ground with an altitude of 0 km or within a range of 0 km ± 2 km, or a geographic area with a certain average altitude, or a geographic area at a specific altitude, such as a geographic area with an altitude of 10 km or within a range of 10 km ± 3 km, etc.

[0120] By way of example and not limitation, the shape of the geographical region can be a regular hexagon, or other shapes such as a regular pentagon, a circle, or an ellipse. Alternatively, the shape of the geographical region can also be irregular, which is not limited in this application.

[0121] As one possible implementation, the Earth's surface can be divided into multiple geographic regions, and these geographic regions can be indexed (e.g., numbered).

[0122] For example, the terminal device and the network device can agree on the numbering method for these geographical regions (e.g., starting from 1 or 0) and the correspondence between regions and indexes; alternatively, the protocol can define the numbering method for these regions and the correspondence between regions and indexes. Based on the index of the geographical regions, information such as the geographical location of the geographical regions can be determined.

[0123] As another possible implementation, the Earth's surface can be divided using a latitude and longitude grid with a specific granularity. For example, the Earth's surface can be divided using a latitude and longitude grid with a granularity of 1 degree. If only this discretization method is used, the globe can be divided into 360×360=129600 regions. Terminal devices and network devices can define the indices of these 129600 regions as 0,1,…,129599, or they can also define them as 1,2,…,129600.

[0124] Optionally, when introducing the altitude attribute of a geographic region, multiple grids can be defined to divide the Earth's surface. For example, a grid at an altitude of 0 km or within a range of 0 km ± 2 km can be divided into 1-degree latitude and longitude grids, generating 129,600 regions. At an altitude of 10 km or within a range of 10 km ± 3 km, another 1-degree latitude and longitude grid can be used, generating yet another 129,600 regions. When indexing these grids, the index range of a single-layer grid needs to be expanded. For example, the total index could be 0, 1, ..., 129599, 129600, 129601, ..., 259199, where the first 129,600 indices represent the grid index at an altitude of 0 km, and the last 129,600 indices represent the grid index at an altitude of 10 km.

[0125] For example, the granularity of the latitude and longitude grid can be determined based on the type of network device. For instance, a relatively small granularity can be used for discretization when the network device is a LEO satellite, and a relatively large granularity can be used when the network device is a GEO satellite.

[0126] 6. Power Control Parameters: Currently, in cellular systems, the power control parameters of the cell can be configured to reduce the UL power of the UE transmitting the preamble, thus avoiding interference with radio telescopes. Specifically, the maximum power of the UE transmitting the preamble is limited by the network configuration parameter P. CMAX For example, the maximum power of the UE transmitting the preamble satisfies the following formula:

[0127] P PRACH,b,f,c (i)=min{P CMAX,f,c (i),P PRACH,target,f,c +PL b,f,c [dBm] (1-1)

[0128] In equation (1-1) above, P PRACH,b,f,c In (i), parameter b represents the uplink (UL) bandwidth part (BWP), parameter f represents the carrier frequency, parameter c represents the serving cell, parameter i represents the transmission occasion, and P CMAX,f,c P represents the maximum UE output power configured for carrier f in serving cell c within each time slot. PRACH,target,f,c PL represents the target received power of the physical random access channel (PRACH). b,f,c This represents the path loss of the active UL BWP based on the DL reference signal (RS) associated with the PRACH transmission on the active downlink (DL) BWP of the serving cell c.

[0129] It should be understood that the relevant parameters in the above equation (1-1) can be referred to the definitions in the current protocol. This application only provides a brief introduction and does not impose any limitations.

[0130] 7. Preamble: A preamble is a specific bit sequence used in communication to synchronize signals between the transmitting and receiving ends. Its main functions include synchronization, frequency offset estimation, and automatic gain control. For example, in LTE, the preamble is used for uplink synchronization, establishing a synchronization relationship with the network, and requesting the allocation of dedicated resources. As another example, in the Wi-Fi standard 802.11a, the preamble is used for signal synchronization and quality detection. It should be understood that this application does not impose any limitations on the preamble; reference can be made to descriptions in current or future related protocols.

[0131] 8. Preamble Sequence Length: 13 preamble sequence formats are supported in 5G networks, such as format 0, format 1, format 2, format 3, format A1, format A2, format A3, format B1, format B2, format B3, format B4, format C0, and format C. Optionally, the above 13 preamble formats can be divided into long sequences and short sequences. It should be understood that this application does not impose any limitation on the preamble sequence length; reference can be made to the descriptions in current or future related protocols.

[0132] 9. Physical Random Access Channel (PRACH): This is the access channel used when a terminal device initiates a call. For example, the terminal device sends a random access preamble to the network device on the PRACH resource. The PRACH resource can be understood as the random access channel occasion (RO).

[0133] 10. Power spectral density (PSD): Signals are usually represented in the form of waves, such as electromagnetic waves, random vibrations, or sound waves. When the power spectral density of a wave is multiplied by an appropriate coefficient, the power carried by the wave per unit frequency is obtained, which is called the power spectral density of the signal.

[0134] 11. Subcarrier Width: This refers to the width of each subcarrier when a carrier frequency is divided into several smaller subcarriers in a communication system. In LTE systems, the width of each subcarrier is fixed at 15kHz. In 5G systems, however, the subcarrier width can vary depending on the frequency band. For example, in the FR1 band (below 6GHz), the subcarrier width can be 5MHz, 10MHz, 15MHz, etc., while in the FR2 band (above 6GHz), the subcarrier width can be 50MHz, 100MHz, 200MHz, etc.

[0135] The preceding text, in conjunction with Figures 3 and 4, briefly introduced the application scenarios of the communication method provided in this application embodiment, and described the basic concepts that may be involved in this application embodiment. Among these basic concepts, it introduced the interference between cellular systems and radio telescopes, as well as the control parameters related to UE uplink power in current cellular systems. However, the above-mentioned UE uplink power control has the following drawbacks:

[0136] 1) For the PRACH of the UE transmitting the preamble, the given PSD threshold corresponds to different P values ​​for preambles of different lengths. CMAX Configure multiple P CMAX There is redundancy.

[0137] 2) The satellite beam coverage area (20km–500km) is much larger than that of a cellular cell, and not all areas fall within the radio telescope's protected zone. For satellite communication systems, adopting the aforementioned cellular power control scheme would unnecessarily limit the power of NTN, UE, and UL devices located far from the radio telescope, thus affecting communication performance.

[0138] As shown in Figure 7, the satellite beam coverage area is much larger than that of a cellular cell. The cellular cells included in the satellite beam coverage area shown in Figure 7 are cell #1, cell #2, cell #3, and cell #4. Based on the positional relationship between the cells and the radio telescope, cells #1 and #2 fall within the protection zone of the radio telescope, meaning that cells #1 and #2 are low UL power cells. Cell #3 is farther from the radio telescope than cells #1 and #2, and can be considered a medium UL power cell. Cell #4 can be considered a normal UL power cell.

[0139] This application provides a communication method to address the problem of excessively large coverage area affected by UL transmit power during satellite cell-level power control in scenarios where satellites or ground relay equipment and radio telescopes coexist. The method utilizes power control parameters P... CMAX To address the issue of excessive overhead during configuration and improve communication performance.

[0140] The communication method provided in this application can be applied to systems that communicate using multi-antenna technology, such as the communication system shown in Figure 1, which may include at least one network device and at least one terminal device. More specifically, the communication method provided in the embodiments of this application can be applied to NTN communication scenarios, such as the satellite communication scenarios shown in Figure 3 or Figure 4. The embodiments shown below do not limit the application scenarios of the method provided in the embodiments of this application.

[0141] The embodiments shown below do not specifically limit the structure of the execution subject of the method provided in the embodiments of this application. As long as it is possible to communicate according to the method provided in the embodiments of this application by running a program that records the code of the method provided in the embodiments of this application.

[0142] For example, the method provided in this application embodiment can be executed by a first communication device (e.g., a terminal device), or by a component of the first communication device (e.g., a processor, chip, or chip system, such as a circuit or chip in the first communication device responsible for communication functions (e.g., a modem chip, also known as a baseband chip, or a SoC chip or SIP chip containing a modem core)), or by a logic module or software capable of implementing all or part of the functions of the first communication device. For ease of description, the following description uses the execution by the first communication device as an example.

[0143] For example, the method provided in the embodiments of this application can be executed by a second communication device (e.g., access mobility management network element), or by a component of the second communication device (e.g., a processor, chip, or chip system, such as a circuit or chip responsible for communication functions in the first communication device (e.g., a modem chip, also known as a baseband chip, or a SoC chip or SIP chip containing a modem core)), or by a logic module or software that can implement all or part of the functions of the second communication device.

[0144] Figure 8 is a schematic flowchart of a communication method provided in an embodiment of this application, including the following steps:

[0145] S810, the second communication device determines the first threshold and the first condition.

[0146] Specifically, the first threshold is used to determine the first uplink transmission power, which is the transmission power of the first communication device transmitting the preamble. The channel through which the first communication device transmits the preamble is called PRACH, and the first threshold is the maximum power spectral density (PSD) of the PRACH.

[0147] As an example and not a limitation, the first threshold may be called the PSD threshold, the PRACH uplink PSD threshold, or the transmit power threshold, etc. This application does not impose any limitation on the name of the first threshold; it only needs to be used to determine the aforementioned first uplink transmit power. Examples will not be provided here.

[0148] As an example and not a limitation, the second communication device may also determine a first condition for using the first threshold, which is used to trigger the use of the first threshold described above.

[0149] For example, the first condition includes location information used to indicate a first geographical area. For instance, if the first communication device is located within the first geographical area, the first communication device determines the first uplink transmission power based on the aforementioned first threshold; or, if the first communication device is located within the first geographical area, the first communication device does not determine the first uplink transmission power based on the aforementioned first threshold.

[0150] As an example and not a limitation, the communication method provided in this application can be applied to scenarios where satellites or ground relay equipment and radio telescopes "coexist." The location indicated by the location information included in the first condition above can be associated with the location of the radio telescope. For example, the location indicated by the location information is within the protection zone of the radio telescope, or the location indicated by the location information is less than a preset threshold distance from the location of the radio telescope.

[0151] Optionally, the first condition may also include, but is not limited to, at least one of the following:

[0152] Information on the time period for transmitting the preamble, the frequency point information of the PRACH for transmitting the preamble, the polarization direction information of the PRACH for transmitting the preamble, or the beam direction information for transmitting the preamble.

[0153] For example, the first condition includes the time period information for sending the preamble, which is used to indicate the first time period. If the first communication device sends the preamble within the first time period, the first communication device determines the first uplink transmission power based on the aforementioned first threshold; or, if the first communication device sends the preamble within the first time period, the first communication device does not determine the first uplink transmission power based on the aforementioned first threshold.

[0154] For example, the frequency information of the PRACH used to transmit the preamble in the first condition is used to indicate the first frequency. If the frequency of the PRACH used by the first communication device to transmit the preamble is the first frequency, the first communication device determines the first uplink transmission power based on the aforementioned first threshold; or, if the frequency of the PRACH used by the first communication device to transmit the preamble is the first frequency, the first communication device does not determine the first uplink transmission power based on the aforementioned first threshold.

[0155] For example, the polarization direction information of the PRACH used to transmit the preamble in the first condition is used to indicate the first polarization direction. If the polarization direction of the PRACH used to transmit the preamble by the first communication device is the first polarization direction, the first communication device determines the first uplink transmission power based on the aforementioned first threshold; or, if the polarization direction of the PRACH used to transmit the preamble by the first communication device is the first polarization direction, the first communication device does not determine the first uplink transmission power based on the aforementioned first threshold.

[0156] For example, the beam direction information of the preamble transmission included in the first condition is used to indicate the first beam direction. If the beam direction of the preamble transmission by the first communication device is the first beam direction or within a specific range around the first beam direction, the first communication device determines the first uplink transmission power based on the aforementioned first threshold; or, if the beam direction of the preamble transmission by the first communication device is not the first beam direction or is not within a specific range around the first beam direction, the first communication device does not determine the first uplink transmission power based on the aforementioned first threshold.

[0157] For example, the second communication device can determine a plurality of first thresholds, and different first thresholds can be applied to different first conditions.

[0158] As described above, the first condition can constrain factors such as the location of the first communication device, the direction of the transmitted preamble beam, polarization, frequency, and time period, thereby allowing the first communication device to select different first thresholds based on different first conditions. See Table 2 below:

[0159] Table 2

[0160] It should be understood that Table 2 above is merely an example to illustrate that the first communication device can select different thresholds based on different conditions. The first condition can also take other forms, which will not be illustrated here. When the first condition is met, the first communication device can determine the transmission power based on the first threshold; when the first condition is not met, the first communication device does not determine the transmission power based on the first threshold.

[0161] For example, the first communication device is a device in the NTN, such as a terminal device that communicates with the NTN device.

[0162] As one possible implementation, the second communication device is an NTN network device or a cellular network device, such as an NTN BS#1 or a TN BS.

[0163] In this implementation, the first threshold determined by the second communication device is the first threshold corresponding to the second cell, the first condition is the first condition corresponding to the second cell, and the PRACH for transmitting the preamble is the PRACH of the second cell. The second cell is the serving cell of the third communication device, and can be a cell adjacent to the serving cell of the second communication device; that is, the second cell can be called a neighboring cell. The third communication device is an NTN network device, such as the second communication device being NTN BS#2. In this implementation, the first threshold can be used to control the transmission power of the first communication device transmitting the preamble in the neighboring cell. Furthermore, in this implementation, the second communication device can also determine the second threshold and the second condition corresponding to its own cell.

[0164] As another possible implementation, the second communication device is an NTN network device or a cellular network device, such as an NTN BS#1 or a TN BS.

[0165] In this implementation, the first threshold determined by the second communication device is the first threshold corresponding to the first cell, the first condition is the first condition corresponding to the first cell, and the PRACH for transmitting the preamble is the PRACH of the first cell. The first cell is the serving cell of the second communication device and can be referred to as the local cell. In this implementation, the first threshold can be used to control the transmission power of the preamble transmitted by the first communication device in the local cell. Furthermore, in this implementation, the second communication device can also determine the second threshold and the second condition corresponding to the neighboring cells adjacent to the local cell.

[0166] Furthermore, after the second communication device determines the first threshold and the first condition, it can send the first threshold and the first condition to the first communication device. Therefore, the method flow shown in Figure 8 further includes:

[0167] S820, the second communication device sends a first threshold and a first condition to the first communication device, and correspondingly, the first communication device receives the first threshold and the first condition from the second communication device.

[0168] Optionally, the second communication device may send the first threshold and the first condition to the first communication device through a single message; or, the second communication device may send the first threshold and the first condition to the first communication device through multiple messages.

[0169] As an example and not a limitation, the second communication device may broadcast the first threshold and the first condition to the first communication device. For example, the second communication device may broadcast PRACH configuration information to the first communication device, which includes the aforementioned first threshold and first condition.

[0170] Optionally, the PRACH configuration information may also include at least one of the following:

[0171] The target received power of PRACH, the output power of the first communication device, or the path loss corresponding to PRACH, etc.

[0172] It should be understood that this application does not impose any limitations on the parameters included in the PRACH configuration information. The information included in the PRACH configuration information specified in the current protocol can be referred to. The difference is that if the above-mentioned first threshold and first condition are included in the PRACH configuration information in the embodiments of this application, then the PRACH configuration information involved in this application has the above-mentioned first threshold added compared with the PRACH configuration information specified in the current protocol. The description of other parameters besides the first threshold can be referred to the definition in the current protocol, and will not be repeated here.

[0173] Furthermore, after receiving the aforementioned first threshold and first condition, the first communication device can determine the first uplink transmission power based on the first threshold and first condition. Therefore, the method flow shown in Figure 8 further includes:

[0174] S830, the first communication device determines the first uplink transmission power.

[0175] For example, when the first communication device meets the first condition, the first communication device determines the first uplink transmission power based on the first threshold, the subcarrier width, and the sequence length of the preamble, where the first uplink transmission power is the transmission power for transmitting the preamble. The subcarrier width is the subcarrier width of the PRACH for transmitting the preamble.

[0176] As an example and not a limitation, the first communication device determines the first uplink transmission power based on a first threshold, a subcarrier width, and a preamble sequence length, including:

[0177] The first communication device calculates the third uplink transmission power based on the first threshold, the subcarrier width, and the preamble sequence length;

[0178] The first communication device determines the first uplink transmission power based on the third uplink transmission power and the second uplink transmission power.

[0179] For example, the first communication device may determine the second uplink transmission power by: the first communication device acquiring the target receive power of PRACH, the path loss corresponding to PRACH, and the output power of the first communication device, and determining the second uplink transmission power based on the target receive power of PRACH, the path loss corresponding to PRACH, and the output power of the first communication device.

[0180] Alternatively, the first communication device can determine the third uplink transmission power by: acquiring PRACH configuration information, determining the preamble sequence length, and the subcarrier width of the PRACH for transmitting the preamble based on the PRACH configuration information. Thus, the third uplink transmission power can be calculated based on the first threshold, the subcarrier width, and the preamble sequence length.

[0181] Optionally, the first threshold, the subcarrier width, the preamble sequence length, and the third uplink transmit power satisfy the following formula:

[0182] P RACH3 =PSD MAX ×SCS×L preamble ;or,

[0183] P RACH3 =PSD MAX +10log 10 (SCS)+10log 10 (L preamble ),

[0184] Wherein, P RACH3 This indicates the third uplink transmit power, and the PSD MAX The first threshold is represented by L, the SCS represents the subcarrier width, and L represents the first threshold. preamble This indicates the sequence length of the preamble.

[0185] Optionally, the target receive power of PRACH, the output power of the first communication device, the path loss corresponding to the PRACH, and the second uplink transmit power satisfy the following formula:

[0186] P RACH2 =min{P CMAX P RACH,target +PL},

[0187] Wherein, P RACH2 This indicates the second uplink transmission power, and the P CMAX P represents the output power of the first communication device. RACH,target The target received power of the PRACH is represented by PL, and the path loss corresponding to the PRACH is represented by PL.

[0188] For example, the third uplink transmission power, the second uplink transmission power, and the first uplink transmission power satisfy the following formula:

[0189] P RACH1 =min{P RACH2 P RACH3},

[0190] Wherein, P RACH3 This indicates the third uplink transmission power, and P RACH2 This indicates the second uplink transmission power.

[0191] For example, the first communication device can determine the first uplink transmission power based on the first threshold as follows:

[0192] As one possible implementation, as can be seen from the above, the first threshold and the first condition determined by the second communication device can be used to control the uplink transmission power of terminal devices in this cell (the cell served by the second communication device, or the cell to which the first communication device belongs).

[0193] In this implementation, the method flow shown in Figure 8 also includes:

[0194] S831, the first communication device sends a preamble to the second communication device, and correspondingly, the second communication device receives the preamble from the first communication device.

[0195] As another possible implementation, as can be seen from the above, the first threshold and the first condition determined by the second communication device can be used to control the uplink transmission power of terminal devices in neighboring cells (cells served by the third communication device).

[0196] In this implementation, the method flow shown in Figure 8 also includes:

[0197] S832, the first communication device sends a preamble to the third communication device, and correspondingly, the third communication device receives the preamble from the first communication device.

[0198] In the communication method shown in Figure 8, the first communication device can determine the transmission power of the preamble based on the received first threshold, subcarrier width, and preamble sequence length. That is, the network device controls the uplink transmission power of the first communication device by sending the first threshold. In the process of determining the uplink transmission power, the first communication device considers the preamble sequence length. That is, different preamble sequence lengths can determine their corresponding uplink transmission power based on a unified first threshold. The network device does not need to configure different first thresholds for different preamble sequence lengths, thereby avoiding parameter redundancy and realizing the control of the uplink power of the first communication device while reducing parameter redundancy.

[0199] In addition, the first communication device can determine the uplink transmission power based on the received first condition and control it based on the first threshold if the first condition is met. That is, if the first condition is not met, the first communication device does not need to control the uplink transmission power based on the first threshold. It can adopt a more refined power control scheme to avoid unnecessary restrictions on the uplink transmission power of the first communication device and achieve control of the uplink power of the first communication device while improving communication performance.

[0200] It should be understood that the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0201] It should also be understood that, unless otherwise specified or logically conflicting, the terminology and / or descriptions in the various embodiments of this application are consistent and can be referenced interchangeably. Furthermore, technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. For example, when considering reducing parameter redundancy, the second communication device provides a unified first threshold to the first communication device to control the uplink transmission power of the first communication device; that is, the aforementioned first condition is optional. As another example, when considering improving communication performance, the second communication device provides a first condition to the first communication device, or the first condition is predefined by the protocol; when the first condition is met, the first communication device performs uplink power control based on power control parameters; that is, the aforementioned first threshold is optional.

[0202] The communication method provided in the embodiments of this application has been described in detail above with reference to Figure 8. The above communication method is mainly described from the perspective of interaction between various entities. It is understood that, in order to realize the above functions, the first communication device and the second communication device, etc., include hardware structures and / or software modules corresponding to perform each function.

[0203] Those skilled in the art will recognize that, based on the units and algorithm steps described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0204] The communication device provided in this application will be described in detail below with reference to Figures 9 and 10. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments. Therefore, for details not described in detail, please refer to the method embodiments above; for brevity, some details will not be repeated.

[0205] This application embodiment can divide the first communication device and the second communication device into functional modules according to the above method example. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. The following description uses the division of functional modules according to each function as an example.

[0206] Figure 9 is a schematic block diagram of a communication device 10 provided in an embodiment of this application. The device 10 includes a transceiver unit 11 and a processing unit 12. The transceiver unit 11 can implement corresponding communication functions, and the processing unit 12 is used for data processing. In other words, the transceiver unit 11 is used to perform operations related to receiving and sending, while the processing unit 12 is used to perform other operations besides receiving and sending. The transceiver unit 11 can also be referred to as a communication interface or communication unit.

[0207] Optionally, the device 10 may further include a storage unit 13, which may be used to store instructions and / or data. The processing unit 12 may read the instructions and / or data in the storage unit so that the device can perform the operation of the device in the aforementioned method embodiments.

[0208] In one design, the device 10 may correspond to the first communication device in the above method embodiments, or to a component of the first communication device (such as a chip).

[0209] The device 10 can implement the steps or processes corresponding to those performed by the first communication device in the above method embodiment. The transceiver unit 11 can be used to perform the transceiver-related operations of the first communication device in the above method embodiment, and the processing unit 12 can be used to perform the processing-related operations of the first communication device in the above method embodiment.

[0210] In one possible implementation, transceiver unit 11 is configured to receive a first threshold and a first condition, wherein the first threshold is the PSD of the Physical Random Access Channel (PRACH), and the first condition includes location information. If the first communication device satisfies the first condition, processing unit 12 is configured to determine a first uplink transmission power based on the first threshold, subcarrier width, and preamble sequence length, wherein the first uplink transmission power is the transmission power for transmitting the preamble; wherein the subcarrier width is the subcarrier width of the PRACH. The first communication device is a device within an NTN, for example, a terminal device communicating with an NTN device.

[0211] When the device 10 is used to execute the method in FIG8, the transceiver unit 11 can be used to execute the steps of transmitting and receiving information in the method, such as steps S820, S831 and S832; the processing unit 12 can be used to execute the processing steps in the method, such as step S830.

[0212] It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0213] In another design, the device 10 may correspond to the second communication device in the above method embodiment, or to a component of the second communication device (such as a chip).

[0214] The device 10 can implement the steps or processes corresponding to those performed by the second communication device in the above method embodiments. The transceiver unit 11 can be used to perform transceiver-related operations of the second communication device in the above method embodiments, and the processing unit 12 can be used to perform processing-related operations of the second communication device in the above method embodiments.

[0215] In one possible implementation, processing unit 12 is configured to set a first threshold and a first condition, the first threshold being the maximum power spectral density (PSD) of the Physical Random Access Channel (PRACH), and the first condition including location information; transceiver unit 11 is configured to send the first threshold and the first condition to a first communication device, wherein, if the first communication device satisfies the first condition, the first threshold, subcarrier width, and preamble sequence length are used to determine a first uplink transmission power, the first uplink transmission power being the transmission power for transmitting the preamble, wherein the subcarrier width is the subcarrier width of the PRACH.

[0216] When the device 10 is used to execute the method in FIG8, the transceiver unit 11 can be used to execute the steps of transmitting and receiving information in the method, such as steps S820 and S831; the processing unit 12 can be used to execute the processing steps in the method, such as step S810.

[0217] It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0218] It should also be understood that the device 10 here is embodied in the form of a functional unit. The term "unit" here can refer to an application-specific integrated circuit (ASIC), electronic circuitry, a processor (e.g., a shared processor, a proprietary processor, or a group processor, etc.) and memory for executing one or more software or firmware programs, integrated logic circuitry, and / or other suitable components supporting the described functions. In an alternative example, those skilled in the art will understand that device 10 may specifically be a mobility management network element in the above embodiments, and may be used to execute the various processes and / or steps corresponding to the mobility management network element in the above method embodiments; or, device 10 may specifically be a terminal device in the above embodiments, and may be used to execute the various processes and / or steps corresponding to the terminal device in the above method embodiments. To avoid repetition, further details are omitted here.

[0219] The apparatus 10 of each of the above-described schemes has the function of implementing the corresponding steps performed by the entities (such as the first communication device and the second communication device) in the above-described methods. This function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above-described functions; for example, the transceiver unit can be replaced by a transceiver (for example, the transmitting unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as processing units, can be replaced by processors, which respectively execute the transceiver operations and related processing operations in each method embodiment.

[0220] In addition, the transceiver unit 11 can also be a transceiver circuit (for example, it may include a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit.

[0221] Figure 10 is a schematic diagram of another communication device 20 provided in an embodiment of this application. The device 20 includes a processor 21, which is used to execute computer programs or instructions stored in a memory 22, or to read data / signaling stored in the memory 22, to perform the methods in the above-described method embodiments. Optionally, there may be one or more processors 21.

[0222] Optionally, as shown in FIG10, the device 20 further includes a memory 22 for storing computer programs or instructions and / or data. The memory 22 may be integrated with the processor 21 or may be disposed separately. Optionally, there may be one or more memories 22.

[0223] Optionally, as shown in FIG10, the device 20 further includes a transceiver 23 for receiving and / or transmitting signals. For example, the processor 21 is used to control the transceiver 23 to receive and / or transmit signals.

[0224] As one option, the device 20 is used to implement the operations performed by the first communication device or the second communication device in the various method embodiments described above.

[0225] It should be understood that the processor mentioned in the embodiments of this application can be a central processing unit (CPU), or it can be one or more combinations of other general-purpose processors, digital signal processors (DSPs), microprocessor units (MPUs), microcontroller units (MCUs), graphics processing units (GPUs), field-programmable gate arrays (FPGAs), artificial intelligence processors (AI processors), or neural processing units (NPUs); or, the processor mentioned in the embodiments of this application can be an ASIC or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0226] It should also be understood that the memory mentioned in the embodiments of this application can be volatile memory and / or non-volatile memory. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be cache or random access memory (RAM). For example, RAM can be used as an external cache. By way of example and not limitation, RAM includes the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0227] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) can be integrated into the processor.

[0228] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0229] This application also provides a chip system (or processing system) including logic circuits and input / output interfaces.

[0230] The logic circuit can be a processing circuit in the chip system. The logic circuit can be coupled to a memory cell, calling instructions from the memory cell, enabling the chip system to implement the methods and functions of the embodiments of this application. The input / output interface can be an input / output circuit in the chip system, outputting processed information or inputting data or signaling information to be processed into the chip system for processing.

[0231] As one approach, the chip system is used to implement the operations performed by the first or second communication device in the various method embodiments described above.

[0232] For example, the logic circuit is used to implement the processing-related operations performed by the first communication device or the second communication device in the above method embodiments; the input / output interface is used to implement the sending and / or receiving-related operations performed by the first communication device or the second communication device in the above method embodiments.

[0233] This application also provides a computer-readable storage medium storing computer instructions for implementing the methods executed by the first communication device or the second communication device in the above-described method embodiments.

[0234] For example, when the computer program is executed by a computer, it enables the computer to implement the methods executed by the first communication device or the second communication device in the various embodiments of the above methods.

[0235] This application also provides a computer program product comprising instructions which, when executed by a computer, implement the methods performed by the first communication device or the second communication device in the above-described method embodiments.

[0236] This application also provides a communication system, including the aforementioned access network device and second communication device. Optionally, the communication system further includes the aforementioned first communication device.

[0237] The explanations and beneficial effects of the relevant contents in any of the devices provided above can be found in the corresponding method embodiments provided above, and will not be repeated here.

[0238] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0239] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0240] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of apparatus or units may be electrical, mechanical, or other forms.

[0241] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0242] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0243] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the 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 cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0244] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, A first communication device applied in a non-terrestrial network (NTN), the method comprising: Receive a first threshold and a first condition, wherein the first threshold is the maximum power spectral density (PSD) of the physical random access channel (PRACH) and the first condition includes location information; When the first communication device meets the first condition, the first uplink transmission power is determined based on the first threshold, the subcarrier width and the sequence length of the preamble, and the first uplink transmission power is the transmission power for transmitting the preamble; Wherein, the subcarrier width is the subcarrier width of the PRACH.

2. The method according to claim 1, characterized in that, The first condition also includes at least one of the following: Information on the time period for transmitting the preamble, the frequency point information of the PRACH for transmitting the preamble, the polarization direction information of the PRACH for transmitting the preamble, or the beam direction information for transmitting the preamble.

3. The method according to claim 1 or 2, characterized in that, The receiving first threshold and first condition include: Receive the first threshold and the first condition from the second communication device, wherein the PRACH is the PRACH of the second cell, the second cell is a cell served by the third communication device, and the second cell is adjacent to the first cell served by the second communication device; The method further includes: The preamble is sent to the third communication device based on the first uplink transmission power.

4. The method according to claim 1 or 2, characterized in that, The receiving first threshold and first condition include: Receive the first threshold and the first condition from the second communication device, wherein the PRACH is the PRACH of the first cell, and the first cell is the cell served by the second communication device; The method further includes: The preamble is sent to the second communication device based on the first uplink transmission power.

5. The method according to any one of claims 1 to 4, characterized in that, The location information indicates a location associated with the location of the radio telescope.

6. The method according to any one of claims 1 to 5, characterized in that, Determining the first uplink transmission power based on the first threshold, the subcarrier width, and the preamble sequence length includes: The third uplink transmission power is calculated based on the first threshold, the subcarrier width, and the sequence length of the preamble. The first uplink transmission power is determined based on the third uplink transmission power and the second uplink transmission power. The second uplink transmit power is determined based on the target receive power of the PRACH, the output power of the first communication device, and the path loss corresponding to the PRACH.

7. The method according to claim 6, characterized in that, The first threshold, the subcarrier width, the preamble sequence length, and the third uplink transmit power satisfy the following formula: P RACH3 =PSD MAX ×SCS×L preamble Or, P RACH3 =PSD MAX +10log 10 (SCS)+10log 10 (L preamble ), Wherein, P RACH3 This indicates the third uplink transmit power, and the PSD MAX The first threshold is represented by L, the SCS represents the subcarrier width, and L represents the first threshold. preamble This indicates the sequence length of the preamble.

8. The method according to claim 6 or 7, characterized in that, The third uplink transmission power, the second uplink transmission power, and the first uplink transmission power satisfy the following formula: P RACH1 =min{P RACH2 P RACH3 }, Wherein, P RACH3 This indicates the third uplink transmission power, and P RACH2 This indicates the second uplink transmission power.

9. A communication method, characterized in that, Applied to a second communication device, the method includes: Determine a first threshold and a first condition, wherein the first threshold is the maximum power spectral density (PSD) of the physical random access channel (PRACH), and the first condition includes location information; The first threshold and the first condition are sent to the first communication device. If the first communication device meets the first condition, the first threshold, the subcarrier width, and the preamble sequence length are used to determine the first uplink transmission power, which is the transmission power for transmitting the preamble. Wherein, the subcarrier width is the subcarrier width of the PRACH.

10. The method according to claim 9, characterized in that, The first condition further includes at least one of the following: time period information for transmitting the preamble, frequency information of the PRACH for transmitting the preamble, polarization direction information of the PRACH for transmitting the preamble, or beam direction information for transmitting the preamble.

11. The method according to claim 9 or 10, characterized in that, The PRACH is the PRACH of the second cell, which is a cell adjacent to the first cell served by the second communication device.

12. The method according to claim 9 or 10, characterized in that, The PRACH is the PRACH of the first cell served by the second communication device; The method further includes: Receive the preamble from the first communication device.

13. The method according to any one of claims 9 to 12, characterized in that, The location information indicates a location associated with the location of the radio telescope.

14. The method according to any one of claims 9 to 13, characterized in that, The first threshold, the subcarrier width, and the preamble sequence length are used to determine the first uplink transmit power, including: The first threshold, the subcarrier width, and the preamble sequence length are used to calculate the third uplink transmit power; The third uplink transmission power and the second uplink transmission power are used to determine the first uplink transmission power. The second uplink transmit power is determined based on the target receive power of the PRACH, the output power of the first communication device, and the path loss corresponding to the PRACH.

15. The method according to claim 14, characterized in that, The first threshold, the subcarrier width, the preamble sequence length, and the third uplink transmit power satisfy the following formula: P RACH3 =PSD MAX ×SCS×L preamble Or, P RACH3 =PSD MAX +10log 10 (SCS)+10log 10 (L preamble ), Wherein, P RACH3 This indicates the third uplink transmit power, and the PSD MAX The first threshold is represented by L, the SCS represents the subcarrier width, and L represents the first threshold. preamble This indicates the sequence length of the preamble.

16. The method according to claim 14 or 15, characterized in that, The third uplink transmission power, the second uplink transmission power, and the first uplink transmission power satisfy the following formula: P RACH1 =min{P RACH2 P RACH3 }, Wherein, P RACH3 This indicates the third uplink transmission power, and P RACH2 This indicates the second uplink transmission power.

17. A communication device, characterized in that, The apparatus includes a unit for performing the method as claimed in any one of claims 1 to 8 or 9 to 16.

18. A communication system, characterized in that, It includes a communication device for performing the method as described in any one of claims 1 to 8 and a communication device for performing the method as described in any one of claims 9 to 16.

19. A communication device, characterized in that, The device includes at least one processor coupled to a memory for storing computer programs or instructions, the processor for executing the computer programs or instructions in the memory, causing the device to perform the method as described in any one of claims 1 to 16.

20. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program or instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1 to 16.

21. A chip or chip system, characterized in that, include: At least one processor is configured to retrieve and run a computer program from memory, causing a communication device equipped with the chip system to perform the method of any one of claims 1 to 16.

22. A computer program product, characterized in that, When the computer program product is run on a computer, it causes the computer to perform the method as described in any one of claims 1 to 16.

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