Communication method and apparatus

Abstract

The present application provides a communication method and apparatus, which can improve the flexibility of limiting a preamble transmit power, and improve the communication performance of a terminal device while ensuring that a protected receiving apparatus is not subjected to interference. The method comprises: receiving configuration information, the configuration information being used to indicate power control parameters respectively corresponding to a plurality of areas, and division of the plurality of areas being based on a relative position of a non-terrestrial network (NTN) device with respect to a protected receiving apparatus, wherein interference with the protected receiving apparatus is generated when a preamble transmit power of a terminal device is greater than or equal to a power threshold, the power control parameters being used to indicate the preamble transmit power, and the preamble transmit power being less than the power threshold; and, when in a first area, sending a random access request message to the NTN device on the basis of the power control parameter corresponding to the first area, the plurality of areas comprising the first area.

Description

Communication methods and devices

[0001] This application claims priority to Chinese Patent Application No. 202411441275.9, filed on October 14, 2024, entitled "Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communications, and more specifically, to a communication method and apparatus. Background Technology

[0003] A radio telescope is an astronomical observation instrument that receives and processes radio signals from the universe. Its performance is affected by the surrounding electromagnetic environment. To protect radio telescopes from interference and ensure they can receive weak cosmic signals, cell-level power limiting is typically required in terrestrial networks to reduce interference from terminal devices accessing the network.

[0004] Non-terrestrial networks (NTNs) can utilize satellites to form a network, providing services such as data transmission and voice communication to user equipment (UEs). However, due to the large beam coverage of satellites, power limitations on satellites can restrict the access of too many terminal devices to the network, thus affecting communication performance. Summary of the Invention

[0005] This application provides a communication method and apparatus that enables terminal devices to access NTN devices based on power control parameters corresponding to their location, thereby improving the flexibility of limiting the preamble transmit power and enhancing the communication performance of the terminal devices while ensuring that the protected receiving devices are not interfered with.

[0006] In a first aspect, a communication method is provided, which can be executed by a terminal device, or by a component of the terminal device (such as a circuit, chip, chip system, or processor), or by a logic node, logic module, or software that can realize all or part of the functions of the terminal device.

[0007] The method includes: receiving configuration information, the configuration information indicating power control parameters corresponding to multiple regions; the multiple regions are divided based on the relative positions between a non-terrestrial network (NTN) device and a protected receiving device; when the preamble transmit power of the terminal device is greater than or equal to a power threshold, interference is generated to the protected receiving device, the power control parameters indicating the preamble transmit power, the preamble transmit power being less than the power threshold; in the case of a first region, sending a random access request message to the NTN device based on the power control parameters corresponding to the first region, the multiple regions including the first region.

[0008] Based on the above technical solution, the configuration information sent by the NTN device to the terminal device indicates the power control parameters corresponding to multiple regions. The terminal device can use the power control parameters corresponding to its own region to initiate random access to the NTN device. In this way, when the terminal device performs random access in different regions, the preamble transmit power can be restricted differently, which can improve the flexibility of restricting the preamble transmit power. Thus, while ensuring that the protected receiving device is not interfered with, the communication performance of the terminal device is improved.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the first region is characterized by at least one of the following: the longitude range where the terminal device is located, the latitude range where the terminal device is located, the beam identifier of the NTN device, the azimuth range of the terminal device relative to the NTN device, the elevation range of the terminal device relative to the NTN device, or the altitude of the terminal device.

[0010] Based on the above technical solution, the first region can include multiple representation methods, which can improve the flexibility of the representation methods and thus improve the flexibility of the first region division.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the configuration information is used to indicate power control parameters corresponding to multiple regions respectively, including: the configuration information is used to indicate the power control parameters corresponding to the multiple regions respectively in at least one time period and / or at least one uplink carrier frequency point.

[0012] Based on the above technical solution, configuring the power control parameters for each region within at least one time period in the configuration information can reduce the duration of power limitation impact and the SI update frequency. Configuring the power control parameters for each region at at least one uplink carrier frequency point in the configuration information can improve the accuracy of the configured preamble transmit power, ensuring that the preamble transmit power is less than the power threshold at any frequency point, thus avoiding interference to the protected receiving device.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: sending the random access request message to the NTN device based on default power control parameters when not in the multiple regions.

[0014] Based on the above scheme, even if the terminal device is not in multiple areas, it can still use the default power control parameters for random access. In this way, the multiple areas in the configuration information can be areas that might interfere with the protected receiving device, thereby reducing indication overhead.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: sending the random access request message to the NTN device based on default power control parameters in the first region, but not during the at least one time period corresponding to the first region and / or on the at least one uplink carrier frequency point.

[0016] Based on the above technical solution, when the terminal device is in the first region, it will only use the power control parameters corresponding to at least one time period and / or uplink carrier frequency for random access if it is within the at least one time period and / or uplink carrier frequency. This reduces the impact of power limitations and improves the accuracy of the configured preamble transmit power.

[0017] In conjunction with the first aspect, in certain implementations of the first aspect, the power control parameter includes at least one of the following: output power threshold P CMAX,f,c Uplink power spectral density (PSD) or preamble received target power (P) PRACH,target,f,c .

[0018] Optionally, the power control parameters include the output power threshold P. CMAX,f,c Through P CMAX,f,c It indicates the upper limit of the preamble's transmit power, has high compatibility with existing technologies, and has low application costs.

[0019] Optionally, the power control parameters include an uplink PSD. The uplink PSD can indicate the preamble transmit power spectral density at different frequency points, thereby enabling indication of the preamble transmit power. This minimizes the indication overhead for Physical Random Access Channels (PRACHs) of different bandwidths.

[0020] Optionally, the power control parameters include the preamble receive target power P. PRACH,target,f,c In this way, terminal devices can directly obtain the preamble transmit power, improving random access efficiency.

[0021] Optionally, the preamble receives the target power P. PRACH,target,f,cThe preamble_Received_Target_Power indicator can be used. A smaller preamble_Received_Target_Power value results in a smaller initial preamble transmit power, and thus a lower preamble transmit power for the terminal device during random access. This allows for simultaneous limitation of the preamble transmit power for each random access attempt, enabling the terminal device to perform random access with the lowest possible preamble transmit power.

[0022] Optionally, the preamble receives the target power P. PRACH,target,f,c This can be indicated by PREABLE_POWER_RAMPING_STEP. The smaller PREABLE_POWER_RAMPING_STEP is, the smaller the increase in preamble transmit power the terminal device will make when re-establishing random access. In this way, the terminal device can re-establish random access with the lowest possible preamble transmit power, thereby limiting the preamble transmit power.

[0023] Secondly, a communication method is provided, which can be executed by an NTN device, or by components of the NTN device (such as circuits, chips, chip systems, or processors), or by a logic node, logic module, or software that can implement all or part of the functions of the NTN device.

[0024] The method includes: sending configuration information, the configuration information indicating power control parameters corresponding to multiple regions; the multiple regions are divided based on the relative positions between non-terrestrial network (NTN) devices and protected receiving devices; interfering with the protected receiving device when the preamble transmit power of the terminal device is greater than or equal to a power threshold, the power control parameters indicating the preamble transmit power, the preamble transmit power being less than the power threshold; and receiving a random access request message from the terminal device, the random access request message being sent by the terminal device based on the power control parameters corresponding to a first region, the terminal device being located in the first region, and the multiple regions including the first region.

[0025] The method provided in the second aspect is the same as the method on the NTN device side corresponding to the first aspect, and its beneficial effects can be directly referred to the first aspect.

[0026] In conjunction with the second aspect, in some implementations of the second aspect, the first region is characterized by at least one of the following: the longitude range where the terminal device is located, the latitude range where the terminal device is located, the beam identifier of the NTN device, the azimuth range of the terminal device relative to the NTN device, the elevation range of the terminal device relative to the NTN device, or the altitude of the terminal device.

[0027] In conjunction with the second aspect, in some implementations of the second aspect, the configuration information used to indicate the power control parameters corresponding to multiple regions respectively includes: the configuration information used to indicate the power control parameters corresponding to multiple regions respectively in at least one time period and / or at least one uplink carrier frequency point.

[0028] In conjunction with the second aspect, in some implementations of the second aspect, the power control parameter includes at least one of the following: output power threshold P CMAX,f,c Uplink power spectral density (PSD) or preamble received target power (P) PRACH,target,f,c .

[0029] Thirdly, a communication device is provided that can be applied to the terminal device described in the first aspect. The communication device includes: a receiving module for receiving configuration information, the configuration information indicating power control parameters corresponding to multiple regions; the multiple regions are divided based on the relative positions between a non-terrestrial network (NTN) device and a protected receiving device; when the preamble transmit power of the terminal device is greater than or equal to a power threshold, interference is generated to the protected receiving device, the power control parameters indicating the preamble transmit power, the preamble transmit power being less than the power threshold; and a sending module for sending a random access request message to the NTN device based on the power control parameters corresponding to the first region in the case of a first region, the multiple regions including the first region.

[0030] Fourthly, a communication device is provided that can be applied to the NTN device described in the second aspect. The communication device includes: a transmitting module for transmitting configuration information, the configuration information indicating power control parameters corresponding to multiple regions; the multiple regions are divided based on the relative positions between the non-terrestrial network NTN device and a protected receiving device; interference is generated to the protected receiving device when the preamble transmit power of the terminal device is greater than or equal to a power threshold, the power control parameters indicating the preamble transmit power being less than the power threshold; and a receiving module for receiving a random access request message from the terminal device, the random access request message being sent by the terminal device based on the power control parameters corresponding to a first region, the terminal device being located in the first region, and the multiple regions including the first region.

[0031] Fifthly, a communication device is provided, comprising: a processor configured to implement the methods of the first and second aspects and any possible implementation thereof. Optionally, the communication device further comprises an interface circuit configured to receive signals from other communication devices and transmit them to the processor, or to send signals from the processor to other communication devices.

[0032] A sixth aspect provides a communication system comprising: a terminal device as described in the first aspect and an NTN device as described in the second aspect.

[0033] In a seventh aspect, a computer-readable storage medium is provided, the computer-readable medium storing a computer program; when the computer program is run on a computer, the methods of the first and second aspects and any possible implementation thereof are executed.

[0034] Eighthly, a computer program product is provided, comprising a computer program that, when executed, causes the communication method in the first and second aspects and any possible implementation thereof to be implemented.

[0035] The solutions provided in the third to seventh aspects above are used to implement or cooperate with the methods provided in the first or second aspects above, and therefore can achieve the same or corresponding beneficial effects as the first or second aspects, which will not be elaborated here. Attached Figure Description

[0036] Figure 1a is a schematic diagram of an NTN communication architecture provided in an embodiment of this application.

[0037] Figure 1b is a schematic diagram of an NTN communication architecture provided in an embodiment of this application.

[0038] Figure 1c is a schematic diagram of an NTN communication architecture provided in an embodiment of this application.

[0039] Figure 2 is a schematic diagram of an O-RAN system provided in an embodiment of this application.

[0040] Figure 3 is a schematic diagram of the relative positions of a cell and a radio telescope provided in an embodiment of this application.

[0041] Figure 4 is a flowchart illustrating a communication method provided in an embodiment of this application.

[0042] Figure 5a is a schematic diagram of a region division provided in an embodiment of this application.

[0043] Figure 5b is a schematic diagram of a region division provided in an embodiment of this application.

[0044] Figure 5c is a schematic diagram of a region division provided in an embodiment of this application.

[0045] Figure 5d is a schematic diagram of a region division provided in an embodiment of this application.

[0046] Figure 6 is a flowchart illustrating another communication method provided in an embodiment of this application.

[0047] Figure 7 is a flowchart illustrating another communication method provided in an embodiment of this application.

[0048] Figure 8 is a schematic block diagram of a communication device provided in an embodiment of this application.

[0049] Figure 9 is a schematic block diagram of another communication device provided in an embodiment of this application.

[0050] Figure 10 is a schematic block diagram of another communication device provided in an embodiment of this application. Detailed Implementation

[0051] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0052] The embodiments of this application can be applied to various communication systems, such as wireless local area network (WLAN), narrowband Internet of Things (NB-IoT), global system for mobile communications (GSM), enhanced data rate for GSM evolution (EDGE), wideband code division multiple access (WCDMA), code division multiple access 2000 (CDMA2000), time division-synchronization code division multiple access (TD-SCDMA), long term evolution (LTE), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX), satellite communication systems, 5th generation (5G) communication systems, or new communication systems that will emerge in the future.

[0053] The terminal device involved in the embodiments of this application can be a device with wireless transceiver capabilities, specifically referring to a subscriber unit, user equipment (UE), access terminal, cellular phone, user station, mobile station (MS), customer-premises equipment (CPE), remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device. The terminal device can also be a satellite phone, cellular phone, smartphone, wireless data card, personal digital assistant (PDA) computer, tablet computer, wireless modem, laptop computer, machine-type communication (MTC) device, and wireless terminal in self-driving vehicles, etc. Terminal devices can also be cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, in-vehicle devices, wearable devices, computing devices or other processing devices connected to a wireless modem, communication devices mounted on high-altitude aircraft, drones, robots, point-of-sale (POS) machines, terminals in device-to-device (D2D) communication, terminals in vehicle-to-everything (V2X) communication, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. Wireless terminals in the home (or terminal equipment in future communication networks), etc. Among these, user equipment includes vehicle user equipment.With the rise of the Internet of Things (IoT) technology, an increasing number of devices that previously lacked communication capabilities—such as, but not limited to, home appliances, vehicles, tools, service equipment, and service facilities—are acquiring wireless communication functionality by being equipped with wireless communication units. This allows them to access wireless communication networks and be remotely controlled. Because these devices are equipped with wireless communication units and thus possess wireless communication capabilities, they also fall under the category of wireless communication devices. This application does not impose any limitations.

[0054] In this embodiment, the device for implementing the functions of the terminal device can be the terminal device itself; or it can be a device capable of supporting the terminal device in implementing the functions, such as a chip system. This device can be installed in the terminal device or used in conjunction with the terminal device. In this embodiment, the chip system can be composed of chips, or it can include chips and other discrete components.

[0055] The network devices involved in this application embodiment are devices in a wireless network, such as radio access network (RAN) nodes that connect terminal devices to the wireless network. Network devices can be nodes in the RAN, also known as base stations, or RAN nodes (or devices). Network devices can be base transceiver stations (BTS) in GSM or CDMA networks, Node Bs (NBs) in WCDMA, evolved Node Bs (eNBs or eNodeBs) in LTE, or next-generation node Bs (gNBs) in 5G networks; network devices can be base stations in future evolved public land mobile networks (PLMNs), or access devices in the 3rd generation partnership project (3GPP); network devices can also be radio controllers in cloud radio access network (CRAN) scenarios. Optionally, the network devices in this application embodiment may include various forms of base stations, such as: relay stations, access points, devices that implement base station functions in communication systems evolved after 5G, mobile switching centers, home evolved NodeBs (HNBs), baseband units (BBUs), devices that perform base station functions in device-to-device (D2D) communication, access points (APs), wireless relay nodes, wireless backhaul nodes, transmission points (TPs), or transmission and reception points (TRPs) in wireless fidelity (WIFI) systems, devices that perform base station functions in vehicle-to-everything (V2X) and machine-to-machine (M2M) communication, and may also include centralized units (CUs) and distributed units (DUs) in CRAN systems, and network devices in non-terrestrial network (NTN) communication systems.The network device in this application embodiment can also be a gNB or transmission point in new radio (NR), one or a group (including multiple) of antenna panels of a base station in NR, or a network node constituting a gNB or transmission point. Alternatively, the network device can be an in-vehicle device, a wearable device, or a network device in a future communication network, or a network device in a future evolved PLMN network, or a network device deployed on a satellite. This application embodiment does not limit this. Furthermore, based on the size of the service coverage area provided, base stations can be divided into macro base stations for providing macro cells, micro base stations for providing pico cells, and femto base stations for providing femto cells. With the continuous evolution of wireless communication technology, future base stations may also adopt other names.

[0056] In this embodiment, the device for implementing the functions of the network device can be the network device itself; or it can be a device capable of supporting the network device in implementing the functions, such as a chip system. This device can be installed in the network device or used in conjunction with the network device.

[0057] NTN communication features wide coverage and flexible networking. It utilizes equipment such as drones, high-altitude platforms (HAPS), and satellites to create networks that provide data transmission and voice communication services to user equipment (UE). High-altitude platform (HAPS) equipment typically operates at an altitude of 8–50 km above the ground. Based on satellite orbital altitude, satellite communication systems can be categorized into three types: Geostationary Earth Orbit (GEO) systems (also known as synchronous orbit satellite systems); Medium Earth Orbit (MEO) systems; and Low Earth Orbit (LEO) systems. GEO satellites orbit at an altitude of 35,786 km, MEO satellites range from 2,000 to 35,786 km, and LEO satellites range from 300 to 2,000 km. Furthermore, large LEO constellations can compensate for the limitations of a single satellite's communication capabilities. In future NTN communication systems, after a UE connects to the system, it will be able to communicate with multiple satellites for a period of time. At this time, multiple satellites can provide communication services for the UE, providing the basic conditions for multi-satellite collaborative transmission.

[0058] Figure 1 is a schematic diagram of the system architecture applied in the embodiments of this application. The system includes terminal equipment, base stations, satellites, gateway stations, and core network equipment. Base stations can be deployed on satellites, as shown in Figure 1(b), in which case the RAN includes the satellite and the gateway station; base stations can also be deployed on the ground, as shown in Figure 1(a), in which case the RRU includes the satellite and the gateway station, and the RAN includes the RRU and the base station. The satellite connects to the gateway station via a wireless link, and the gateway station connects to the base station or core network on the ground via wired or wireless connections. When the base station is deployed on the ground, the base station communicates with the terminal equipment via the satellite, which acts as a signal relay. Wireless links can exist between satellites, as shown in Figure 1(c), and the satellite has the function of transparent transmission and forwarding. The descriptions of the various network elements in Figure 1 and the interfaces between different network elements are as follows.

[0059] Terminal devices: These include mobile devices that support the new air interface, such as mobile phones and tablets. They can access satellite networks via the air interface and initiate services such as making calls and accessing the internet.

[0060] Base stations primarily provide wireless access services, allocate wireless resources to accessing terminal devices, and provide reliable wireless transmission protocols and data encryption protocols to the terminal devices.

[0061] Core network equipment: Responsible for user access control, mobility management, session management, user authentication, and accounting. It consists of multiple functional units, including control plane functional entities and data plane functional entities. The access and mobility management unit (AMF) is responsible for user access management, authentication, and mobility management. The user plane function (UPF) is responsible for managing user plane data transmission, traffic statistics, and other functions.

[0062] Gateway station: Responsible for forwarding signaling and service data between satellites and base stations, or between satellites and the core network.

[0063] Air interface: The wireless link between terminal equipment and base station, and the wireless link between satellite and gateway station.

[0064] Xn interface: The interface between base stations, mainly used for signaling interaction such as handover.

[0065] NG interface: The interface between the base station and the gateway station deployed on the satellite, and the interface between the gateway station and the core network. It is mainly used for exchanging non-access stratum (NAS) signaling of the core network and user service data.

[0066] RAN can be a 3GPP-related cellular system, such as 4G, 5G mobile communication systems, or future-oriented evolution systems. RAN can also be an open access network (open RAN, O-RAN, or ORAN), CRAN, or a Wi-Fi system. RAN can also be a communication system that integrates two or more of the above systems.

[0067] Figure 2 illustrates a schematic diagram of an O-RAN system, which may include components other than those shown in Figure 2. As shown in Figure 2, network devices are also known as access network devices. Access network devices (such as eNBs, gNBs, or next-generation access network devices) communicate with core network (CN) devices via backhaul links and with terminal devices via air interfaces.

[0068] Specifically, the baseband unit (BBU) in the access network equipment communicates with the core network equipment via a backhaul link, and the radio unit (RU) in the access network equipment communicates with at least one terminal device via an air interface. The BBU communicates with at least one RU via a fronthaul link. The BBU and RU may or may not be co-located.

[0069] The BBU includes at least one control unit (CU) and at least one DU, which can communicate via at least one midhaul link.

[0070] It should be noted that the embodiments of this application can be applied to communication systems such as 4G and 5G. If it is applied to a 4G communication system, the Xn interface in Figure 1 is the X2 interface and the NG interface is the S1 interface.

[0071] To facilitate understanding of the embodiments of this application, the technical solutions related to the embodiments of this application will be briefly introduced below.

[0072] Satellite communication offers unique advantages over terrestrial communication, such as wider coverage and the reduced vulnerability of satellite-based base stations to natural disasters or external damage. Integrating satellite communication into 5G can provide services to areas inaccessible to terrestrial networks, such as oceans and forests; enhance the reliability of 5G, ensuring better communication for users on airplanes, trains, and other modes of transportation; and provide more data transmission resources, increasing network speed. Therefore, supporting both terrestrial and satellite communication is an inevitable trend in 5G, offering significant benefits in terms of wider coverage, reliability, multi-connectivity, and high throughput.

[0073] Satellite communication has already been incorporated into the 3GPP standard as a communication scenario for 5G. To adapt to the characteristics of high latency and high mobility, the standard has enhanced technologies such as timing, synchronization, and hybrid automatic repeat reQuest (HARQ).

[0074] In existing terrestrial communications, uplink signals from terminals may interfere with nearby radio telescopes. Radio protection zones are established around radio telescopes, and the UL power of terminal equipment within these zones is typically limited to -3 to 12 dBm, with different limits for different frequencies. Limiting UL power usually employs a cell-level power control scheme, where the UE's UL power is controlled for different cells. As shown in Figure 3, cells 1 and 2, closest to the radio telescope, have the lowest power limits; cell 3 has a higher power limit than cells 1 and 2; and cell 4 uses normal UL power without power limitation. However, satellite beam coverage is typically large, potentially encompassing the beam coverage of multiple cells. Limiting satellite power would result in some terminal equipment within the satellite's beam coverage area that would not interfere with the radio telescope being power-limited as well, thus affecting the communication performance of these terminal devices.

[0075] Figure 4 shows a schematic flowchart of a communication method 400 provided in an embodiment of this application. As shown in Figure 4, the method includes:

[0076] S110, the NTN device sends configuration information to the terminal device. The configuration information is used to indicate the power control parameters corresponding to multiple regions. The multiple regions are divided based on the relative position between the NTN device and the protected receiving device. If the preamble transmit power of the terminal device is greater than or equal to the power threshold, it will cause interference to the protected receiving device. The power control parameters are used to indicate the preamble transmit power. If the preamble transmit power is less than the power threshold, it will cause interference to the protected receiving device.

[0077] In this embodiment, the protected receiving device is a first radio wave receiving device with high receiving sensitivity. When the terminal device transmits a second radio wave to the NTN device, if the power of the second radio wave is greater than or equal to a power threshold, it will be interfered with, thus affecting the signal reception function. The second radio wave is the carrier wave used by the terminal device to send a random access request message to the NTN device. The protected receiving device can be a radio telescope or a fixed return device, etc. In the direction of the radio telescope's observation, the NTN device cannot transmit signals of the same frequency or adjacent frequency towards the radio telescope to avoid interfering with the radio telescope's observations.

[0078] In this embodiment, the region is fixed relative to the Earth's surface and has at least one of the following attributes: shape, outline, size, radius, area, geographical location, and altitude. The projection shape of the region on the ground can be circular, elliptical, square, or irregular, etc., and this embodiment does not impose any limitations on this. Different regions within a plurality of regions may have different levels of interference to the protected receiving device, and the power threshold may also differ. Specifically, the smaller the angle between the transmission direction of the second radio wave and the direction in which the protected receiving device receives the first radio wave, the greater the interference to the protected receiving device; the closer the region emitting the second radio wave is to the protected receiving device, the greater the interference to the protected receiving device. In other words, the NTN device can divide the region according to its relative position to the protected receiving device.

[0079] In one possible implementation, different regions within the multiple regions can correspond to different power control parameters. This allows for more refined power control parameters for each region, thereby improving the accuracy of limiting the preamble transmit power in each region. For example, the multiple regions include regions 1-5, where region 1 corresponds to power control parameter 1, region 2 corresponds to power control parameter 2, region 3 corresponds to power control parameter 3, region 4 corresponds to power control parameter 4, and region 5 corresponds to power control parameter 5.

[0080] In one possible implementation, each of the multiple regions has a unique corresponding power control parameter, and one power control parameter can correspond to at least one region. Thus, regions with the same level of interference to the protected receiving device can be set to the same power control parameter, reducing the overhead of configuration information indication. For example, the multiple regions include regions 1-5, with region 1 corresponding to power control parameter 1, regions 2-3 corresponding to power control parameter 2, and regions 3-4 corresponding to power control parameter 3.

[0081] In one possible implementation, the multiple regions include areas within the beam coverage of the NTN equipment. This reduces the amount of instruction required by configuring power control parameters for multiple regions only for terminal devices capable of accessing the NTN equipment. In another possible implementation, the multiple regions may also include areas outside the beam coverage of the NTN equipment. This allows different NTN devices to use the same configuration information to indicate the power control parameters for each region, enabling terminal devices capable of accessing these NTN devices to use the same configuration information to access different NTN devices, reducing the complexity of configuration settings in the NTN network. In yet another possible implementation, the multiple regions may be areas that would interfere with the protected receiving device; this reduces the number of areas where power control parameters need to be configured, thereby reducing instruction overhead.

[0082] In this embodiment, the preamble transmission power is the transmission power of the preamble code. Power control parameters are used to indicate the preamble transmission power of the terminal device, ensuring that the preamble transmission power is less than a power threshold; thus, when the terminal device accesses the NTN device, it will not interfere with the protected receiving device. In one possible implementation, the power control parameters can be used to indicate the anti-interference range of the preamble transmission power; within this range, the preamble transmission power will not interfere with the protected device; this increases the selectivity of the preamble transmission power. In another possible implementation, the power control parameters can be used to indicate a preamble transmission power less than a power threshold; thus, the terminal device can directly obtain the preamble transmission power, improving random access efficiency.

[0083] Optionally, the power control parameters include at least one of the following: output power threshold P CMAX,f,c Uplink power spectral density (PSD), or preamble received target power P PRACH,target,f,c .

[0084] Leader power P PRACH,b,f,c For the calculation method, please refer to formula (1): P PRACH,n,f,c =min{P CMAX,f,c ,P PRACH,target,f,c +PL b,f,c}Formula (1)

[0085] Among them, PL b,f,c This is due to road damage.

[0086] P PRACH,target,f,c The value is provided by the higher-level parameter preamble target received power (preamble_Received_Target_Power), where preamble_Received_Target_Power is the initial value of the preamble transmit power, as detailed in formula (2). PRACH,target,f,c =preamble_Received_Target_Power +DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER-1)×PREABLE_POWER_RAMPING_STEP Formula (2)

[0087] From formulas (1) and (2), it can be seen that P CMAX,f,cUsed to indicate the upper limit of the preamble transmit power. At least one of DELTA_PREAMBLE, preamble_Received_Target_Power, or PREABLE_POWER_RAMPING_STEP is used to determine the preamble transmit power during the access process. PREAMBLE_POWER_RAMPING_COUNTER represents the number of times the preamble is transmitted, initially set to 1, and increments by 1 for each retransmission of the preamble, assuming the reference synchronization signal block (SSB) or the channel status information-reference signals (CSI-RS) remains unchanged. PREAMBLE_POWER_RAMPING_STEP increments by 1 for each retransmission of the preamble. PRACH,target,f,c The incrementing step size is usually determined by the powerRampingStep parameter in SIB1.

[0088] The value of DELTA_PREAMBLE varies depending on the format of the preamble. Refer to Table TS38.321 7.3-1 in the 3GPP protocol for the DELTA_PREAMBLE values ​​of various long preamble formats, and refer to Table TS38.321 7.3-2 in the 3GPP protocol for the DELTA_PREAMBLE values ​​of various short preamble formats.

[0089] Optionally, the configuration information is used to indicate the uplink power spectral density (PSD), which varies at different frequency points. This minimizes the overhead of indicating the Physical Random Access Channel (PRACH) for different bandwidths.

[0090] Optionally, the configuration information is used to indicate the P corresponding to each of the multiple regions. CMAX,f,c For example, different regions correspond to different P values. CMAX,f,c In this way, different upper limits for the preamble transmit power are configured for each region, thereby indicating the preamble transmit power. This requires minimal changes to the existing 3GPP protocol and has higher compatibility with existing technologies.

[0091] Optionally, the configuration information is used to indicate the P corresponding to each of the multiple regions. PRACH,target,f,c In one possible implementation, P PRACH,target,f,cThe preamble transmit power can be indicated via `preamble_Received_Target_Power`; the smaller the value of `preamble_Received_Target_Power`, the smaller the initial value of the preamble transmit power, and the smaller the indicated preamble transmit power. By configuring `preamble_Received_Target_Power`, the preamble transmit power can be limited for each random access, allowing terminal devices to use the lowest possible preamble transmit power for random access, thereby reducing interference to protected receiving devices. In one possible implementation, P... PRACH,target,f,c The PREABLE_POWER_RAMPING_STEP value can be used to indicate this; the smaller the PREABLE_POWER_RAMPING_STEP value, the smaller the increase in preamble transmit power when the terminal device re-enters random access. This allows the terminal device to re-enter random access with the lowest possible preamble transmit power, thereby reducing interference to the protected receiving device.

[0092] In one possible implementation, the broadcast message from the NTN device may include configuration information. This configuration information may include the mapping between multiple regions and multiple power control parameters. By configuring power control parameters through broadcast messages, terminal devices that can receive the broadcast messages can quickly obtain the power control parameters corresponding to multiple regions, improving the efficiency of random access by terminal devices.

[0093] The broadcast message can be either a Master Information Block (MIB) or a System Information Block (SIB). In some embodiments, the configuration information can be implemented in the Cell Reference Signal (CRS) in SIB3. In some embodiments, the configuration information can be implemented in the Cell Reference Signal (CRS) in SIB4.

[0094] Optionally, when the transmission direction of the first radio wave is determined, multiple regions can be divided according to the range of the transmission direction of the second radio wave. For example, different transmission direction ranges can be represented by different beams, and the coverage range of different beams can represent different regions; as shown in Figure 5a, the satellite 50 has seven beams, corresponding to seven regions: 1-7, with each beam representing the region covered by that beam. For example, different transmission direction ranges can be represented by azimuth ranges centered on the NTN device, with different azimuth ranges representing different regions; as shown in Figure 5b, the azimuth ranges centered on the satellite 50 include six: azimuth range 1-azimuth range 6, corresponding to regions 1-6 respectively. It should be noted that the size of the azimuth ranges corresponding to different regions can be the same or different; this application embodiment does not limit the setting of the azimuth ranges.

[0095] Optionally, multiple regions are divided based on the range of distances between the region and the protected device. For example, if the location of the protected receiving device is fixed relative to the Earth's surface, with its longitude, latitude, and altitude remaining substantially constant, then a region with a different longitude range, latitude range, or altitude range will have a different distance from the protected receiving device. Different longitude ranges, different latitude ranges, or different altitude ranges can characterize different regions.

[0096] Figure 5c shows a schematic diagram of a region division. As shown in Figure 5c, according to the longitude range, multiple regions can include three: longitude range 1 (longitude 1-longitude 2), longitude range 2 (longitude 2-longitude 3), and longitude range 3 (longitude 3-longitude 4); according to the latitude range, multiple regions can include three: latitude range 1 (latitude 1-latitude 2), latitude range 2 (latitude 2-latitude 3), and latitude range 3 (latitude 3-latitude 4); according to the longitude and latitude ranges forming a longitude and latitude grid, multiple regions can include nine longitude and latitude grids, that is, the intersections between longitude ranges 1-3 and latitude ranges 1-3 respectively.

[0097] In one possible implementation, the shape of the region corresponding to the latitude and longitude range can be circular. A circular region can be divided by the longitude and latitude of its center and its radius; for example, longitude 6, latitude 7, and radius 4 can correspond to a circular region. In another possible implementation, the shape of the region corresponding to the latitude and longitude range can be polygonal. A polygonal region can be divided by the longitude and latitude of its vertices; for example, vertex 1 (longitude 12, latitude 33), vertex 2 (longitude 22, latitude 34), and vertex 3 (longitude 4, latitude 7) correspond to a triangular region. Here, the shape of the region corresponding to the latitude and longitude range can be set according to actual needs, and this application embodiment does not impose any limitations.

[0098] In one possible implementation, the Earth's surface can be divided into latitude and longitude grids with a preset granularity. The preset granularity can be set according to actual needs, and this application does not impose limitations on it. For example, with a preset granularity of 1 degree, the Earth's surface can be divided into 129,600 regions. In some embodiments, the preset granularity can be set according to the altitude of the NTN device; the higher the altitude, the larger the preset granularity. For example, the preset granularity when the NTN device is a GEO satellite can be greater than the preset granularity when the NTN device is a LEO satellite.

[0099] Optionally, the multiple zones are divided based on the elevation angle range of the terminal device relative to the NTN device. Here, the elevation angle is the angle between the line connecting the terminal device and the NTN device and the projection line of that line on the ground. The larger the elevation angle, the closer the terminal device is to the NTN device. When the elevation angle is 90 degrees, the terminal device is located directly below the NTN device. Figure 5d shows a schematic diagram of the zone division. As shown in Figure 5d, the multiple zones divided according to the elevation angle range relative to satellite 50 include: elevation angle range 1 (elevation angle 1 - 90 degrees), elevation angle range 2 (elevation angle 2 - elevation angle 1), and elevation angle range 3 (elevation angle 3 - elevation angle 2).

[0100] Optionally, the multiple regions can also be divided based on azimuth and elevation ranges. Referring to Figures 5b and 5d, the multiple regions include 18 areas, which are formed by the intersection of azimuth ranges 1-6 and elevation ranges 1-3.

[0101] Optionally, the multiple regions can also be divided according to altitude ranges. For example, the multiple regions may include: altitude range 1 (0km-2km), altitude range 2 (2km-10km), and altitude range 3 (10km-20km).

[0102] In the embodiments of this application, any one of the multiple regions can be characterized by at least one of the following methods: longitude range, latitude range, beam identifier of NTN equipment, azimuth angle relative to NTN equipment, elevation angle relative to NTN equipment, or altitude range.

[0103] Optionally, multiple regions can be divided by combining longitude, latitude, and altitude ranges. After the Earth's surface is divided into longitude and latitude grids, a region corresponds to all altitude ranges of one longitude and latitude grid. By introducing altitude ranges on top of the longitude and latitude grid, a region can be a longitude and latitude grid within a specific altitude range; thus, any longitude and latitude grid can serve as a different region at different altitude ranges. In some embodiments, multiple regions can be divided by an angular grid composed of azimuth and elevation ranges, where any angular grid can serve as a different region at different altitude ranges.

[0104] For example, with a preset granularity of 1 degree, the Earth's surface can be divided into 129,600 latitude and longitude grids. Combining this with altitude range 1 (0km-2km) and altitude range 2 (2km-10km), we can obtain 129,600 latitude and longitude grids within altitude range 1 and 129,600 grids within altitude range 2.

[0105] In this embodiment, multiple regions can be represented by region identifiers. The method of setting region identifiers can be set according to actual needs, and this embodiment does not impose any restrictions.

[0106] For example, the area identifier can be a number composed of numbers, letters, etc., and the correspondence between the number and the area is pre-agreed upon by the NTN device and the terminal device. For example, the six areas in Figure 5b can be identified by A1-A6 respectively. For example, the area identifier can use numerical values ​​to index multiple areas to reduce the overhead of configuration information. For example, the 129,600 latitude and longitude grids on the Earth's surface can be indexed by numbers 0-12959. When the Earth's surface includes multiple latitude and longitude grids, the first layer of grids can be indexed by 0-12959, the second layer of grids can be indexed by 129600-259199, and so on. The first layer can be the bottom layer or the top layer of multiple layers, etc., and this application embodiment does not limit this.

[0107] For example, the area identifier can be set according to the division method of multiple areas. For instance, areas divided by beam can use the beam identifier as the area identifier; areas divided by latitude and longitude range can use the actual longitude and latitude range as the area identifier; areas divided by azimuth range can use the actual azimuth range as the area identifier, and so on.

[0108] In this embodiment, the correspondence between multiple regions and power control parameters can be characterized as the correspondence between region identifiers and power control parameters of multiple regions. For example, Table 1 shows the beam identifier and P... CMAX,f,c The correspondence.

[0109] Table 1

[0110] S120, In the case of the first region, the terminal device obtains the power control parameters corresponding to the first region, and the first region is included among multiple regions.

[0111] In this embodiment, the first region is any one of multiple regions. The location of the terminal device can be characterized by at least one of the following: the beam identifier of the stationary beam, latitude and longitude coordinates, azimuth angle relative to the NTN device, elevation angle relative to the NTN device, or altitude. The region where the terminal device is located can be characterized by at least one of the following: beam identifier, longitude range, latitude range, azimuth angle range of the terminal device relative to the NTN device, elevation angle range of the terminal device relative to the NTN device, or altitude range.

[0112] In this embodiment, the terminal device can detect the beam identifier of the stationary beam and use the stationary beam corresponding to the beam identifier to represent the position of the terminal device. The terminal device can also detect at least one of the following to represent its position: latitude and longitude coordinates, azimuth angle relative to the NTN device, elevation angle relative to the NTN device, or altitude.

[0113] S130, the terminal device sends a random access request message to the NTN device based on the power control parameters corresponding to the first region.

[0114] In this embodiment, after obtaining the power control parameters corresponding to the first region, the terminal device sends a random access request message to the NTN device based on the power control parameters corresponding to the first region. For example, the power control parameters are used to indicate a power threshold, and the preamble transmit power of the terminal device sending the random access request message must be less than the power threshold. For example, the power control parameters are used to indicate a preamble transmit power less than the power threshold, and the terminal device can directly use the preamble transmit power indicated by the power control parameters to send the random access request message.

[0115] Understandably, since the configuration information sent by the NTN device to the terminal device indicates the power control parameters corresponding to multiple regions, the terminal device can use the power control parameters corresponding to its own region to initiate random access to the NTN device. In this way, the preamble transmit power can be restricted differently when the terminal device performs random access in different regions, which can improve the flexibility of restricting the preamble transmit power. Thus, while ensuring that the protected receiving device is not interfered with, the communication performance of the terminal device is improved.

[0116] Optionally, after the NTN device sends configuration information to the terminal device, if the terminal device is not in the first area, it can obtain the default power control parameters and send a random access request message to the NTN device based on the default power control parameters.

[0117] It should be noted that NTN devices can also be configured with default power control parameters. These default power control parameters indicate the power control parameters for areas other than the multiple regions. Thus, when a terminal device is in the first region of multiple regions, it can use the power control parameters corresponding to the first region indicated in the configuration information for random access. Alternatively, when the terminal device is not in multiple regions, it can use the default power control parameters for random access. This multi-level configuration of power control parameters enables rapid configuration of regionalized power control parameters, allowing the terminal device to quickly determine the preamble transmit power in any region, thereby improving the efficiency of random access.

[0118] In one possible implementation, the default power control parameters can be cell-level power control parameters; each NTN device has its own default power control parameters. The preamble transmit power indicated by the cell-level power control parameters is greater than the preamble transmit power indicated by the power control parameters in the configuration information.

[0119] In this embodiment, after detecting its location, the terminal device can first determine whether its location belongs to a first region among multiple regions. If so, it can obtain the power control parameters corresponding to the first region from the configuration information and perform random access based on the power control parameters corresponding to the first region. Otherwise, it obtains the default power control parameters and performs random access based on the default power control parameters.

[0120] For example, the configuration information is used to indicate the P corresponding to multiple regions. CMAX,f,c Different regions correspond to different P values. CMAX,f,c When the terminal device is in the first of multiple regions, the P corresponding to the first region can be used. CMAX,f,c When performing random access and the terminal device is not located in multiple areas, the default P of the NTN device can be used. CMAX,f,c Random access is then performed. This means that terminal devices in multiple regions will face stricter restrictions and will need to use lower preamble transmit power for random access; while terminal devices not in multiple regions can directly access the system based on the default P... CMAX,f,c Random access is achieved using a high preamble transmit power. This allows for precise regionalization of P... CMAX,f,c The configuration reduces the limitations imposed by preamble transmit power on terminal devices located in multiple regions, thereby improving communication performance.

[0121] For example, the configuration information is used to indicate the preamble_Received_Target_Power for multiple regions, with different regions corresponding to different preamble_Received_Target_Power. When the terminal device is not in multiple regions, it can use the default preamble_Received_Target_Power of the NTN device to obtain a larger initial value for the preamble transmit power, thereby using a larger preamble transmit power for random access. When the terminal device is in the first region of multiple regions, it can use the preamble_Received_Target_Power corresponding to the first region to obtain a smaller initial value for the preamble transmit power, thereby using a smaller preamble transmit power for random access. In this way, precise regionalized preamble_Received_Target_Power configuration can be achieved, reducing the preamble transmit power limitation for terminal devices not in multiple regions and improving communication performance.

[0122] For example, the configuration information is used to indicate the PREABLE_POWER_RAMPING_STEP corresponding to multiple regions, with different PREABLE_POWER_RAMPING_STEPs for different regions. When the terminal device is not in multiple regions, a larger PREABLE_POWER_RAMPING_STEP is used, resulting in a larger increase in preamble transmit power when re-establishing random access. The terminal device can then use a larger preamble transmit power for re-establishing random access. When the terminal device is in the first region of multiple regions, a smaller PREABLE_POWER_RAMPING_STEP is used, resulting in a smaller increase in preamble transmit power when re-establishing random access. The terminal device can then use a smaller preamble transmit power for re-establishing random access. This allows for precise regionalized PREABLE_POWER_RAMPING_STEP configuration. For terminal devices not in multiple regions, this reduces the preamble transmit power limitation during re-establishing random access, improving communication performance.

[0123] Figure 6 shows a flowchart of a communication method. As shown in Figure 6, the communication method 600 may include:

[0124] S610 and NTN devices send configuration information to terminal devices.

[0125] The configuration information is used to indicate the P corresponding to each of the multiple beam identifiers. CMAX,f,c .

[0126] S620, the terminal device obtains the P corresponding to the beam identifier of the resident beam from the configuration information. CMAX,f,c .

[0127] It should be noted that after detecting the beam identifier of the resident beam, the terminal device can determine whether the configuration information contains the P corresponding to that beam identifier. CMAX,f,c If configured, then the output power threshold P corresponding to that beam identifier will be used. CMAX,f,c P, the location corresponding to the terminal device CMAX,f,c Otherwise, the default output power threshold P will be used. CMAX,f,c P, the location corresponding to the terminal device CMAX,f,c .

[0128] S630, Terminal equipment based on the beam identifier corresponding to the resident beam P CMAX,f,c Send a random access request message to the NTN device.

[0129] Understandably, beam identification is used to identify the location of the terminal device. By detecting the stationary beam, the terminal device can determine its location and thus obtain the output power threshold P corresponding to the beam identification of the stationary beam. CMAX,f,c This power is used as the maximum uplink power of the terminal device at its current location, thereby limiting the power of the terminal device in different areas and avoiding interference with the protected receiving device; the configuration method is simple and the indication overhead is small.

[0130] Figure 7 shows a flowchart of a communication method. As shown in Figure 7, the communication method 700 may include:

[0131] S710 and NTN devices send configuration information to terminal devices.

[0132] The configuration information is used to indicate the output power threshold P corresponding to each of the multiple region identifiers. CMAX,f,c .

[0133] For example, multiple regions are divided according to a latitude and longitude grid, and the region identifier is a latitude and longitude grid identifier, which includes a longitude range identifier and a latitude range identifier. Table 2 shows one type of region identifier and P. CMAX,f,c The correspondence is as follows: lat11-lat12 is the longitude range identifier, representing the longitude range from longitude 11 to longitude 12, and long11-long12 is the latitude range identifier, representing the latitude range from latitude 11 to latitude 12.

[0134] For example, 11 and 12 can represent different longitudes. For instance, longitude 11 can represent 35° East, and longitude 12 can represent 60° East.

[0135] Table 2

[0136] Optionally, multiple regions can be divided together according to latitude and longitude grids and angle grids, with region identifiers including latitude and longitude grid identifiers and angle grid identifiers. Based on Table 2, Table 3 shows one type of region identifier and P. CMAX,f,c The correspondence is as follows. The angle grid identifier includes azimuth range identifiers and elevation range identifiers. For example, theta11-theta12 represents the azimuth range of azimuth 11-12, and phi11-phi12 represents the elevation range of azimuth 11-12. In some embodiments, theta11 and theta12 can represent different azimuth angles, for example, theta11 can be an azimuth angle of 45°, and theta12 can be an azimuth angle of 135°; phi11-phi12 can represent different azimuth angles, for example, phi11 can be an elevation angle of 45°, and phi12 can be an elevation angle of 60°.

[0137] Table 3

[0138] S720, The terminal device obtains the output power threshold P corresponding to the location of the terminal device from the configuration information. CMAX,f,c .

[0139] It should be noted that the first region includes a first latitude and longitude grid and a first angle grid. After detecting the latitude and longitude coordinates corresponding to the terminal device's location, and the azimuth and elevation angles relative to the NTN device, the terminal device can determine whether the latitude and longitude coordinates are within the first latitude and longitude grid, and whether the azimuth and elevation angles relative to the NTN device are within the first angle grid. If so, the corresponding output power threshold P is marked for this first region. CMAX,f,c The output power threshold P corresponding to the location of the terminal device CMAX,f,c Otherwise, the default output power threshold P will be used. CMAX,f,c The output power threshold P corresponding to the location of the terminal device CMAX,f,c If the terminal device is not within either the first latitude and longitude grid or the first angle grid, then it is not within the first area.

[0140] S730: The terminal device sends a random access request message to the NTN device.

[0141] Understandably, the flexible nature of latitude and longitude grid division allows for improved flexibility in identifying the location of terminal devices. It also simplifies configuration and reduces overhead.

[0142] Optionally, the configuration information may also indicate power control parameters for multiple regions at at least one time period and / or at least one uplink carrier frequency. When the terminal device is in a first region among the multiple regions, and within a first time period of at least one time period and / or at a first uplink carrier frequency of at least one uplink carrier frequency, it sends a random request message to the NTN device based on the power control parameters of the first region within the first time period and / or at the first uplink carrier frequency.

[0143] The time can be represented using the national standard time, such as 15:25:34; or it can be a relative time, such as one minute every hour. This application does not impose any restrictions on this. Time periods can be represented by time period identifiers, and uplink carrier frequency points can be represented by frequency point identifiers. This application does not impose any restrictions on the settings of time identifiers and frequency point identifiers.

[0144] Optionally, the configuration information may include a region identifier that identifies the corresponding power control parameters for a specific time period, as shown in Table 4 based on Table 3. The power control parameter is P. CMAX,f,c For example, t11 can represent 11:00, and t12 can represent 12:00.

[0145] Table 4

[0146] In this embodiment of the application, if the terminal device is not in the first area, the default P is directly used. CMAX,f,c Random access is performed. If the terminal device is in the first area, before sending the random access request message, it needs to determine whether the sending time falls within the specific time period corresponding to the specific time period identifier. If so, the corresponding P can be used according to the specific time period identifier of the first area. CMAX,f,c Random access will be performed; otherwise, if the terminal device operates outside the specific time period in the first area, the default P can be used. CMAX,f,c Random access can be implemented. For radio telescopes that perform observation functions within specific time periods, power limiting can be applied in time periods to further reduce the impact on communication performance.

[0147] Optionally, the configuration information may include power control parameters corresponding to the area identifier in each time period, as shown in Table 5 based on Table 4. Specifically, the configuration information configures P for each time period that may interfere with the protected receiving device. CMAX,f,c This can reduce the frequency of System Information (SI) updates at different times and reduce SI resource overhead.

[0148] Table 5

[0149] Optionally, the configuration information may include the power control parameters corresponding to the region identifier on each uplink carrier frequency point, based on Table 3, as shown in Table 6. The power control parameter is P. CMAX,f,c f1 and f2 are different uplink carrier frequencies. An uplink carrier frequency is the frequency of the carrier that the terminal device uses to transmit signals to the NTN device. Thus, the P-value of the preamble transmit power in the first region at each uplink carrier frequency is refined. CMAX,f,c This can improve the accuracy of indicating the power of the lead-in transmitter.

[0150] Table 6

[0151] Optionally, the configuration information may include the power control parameters corresponding to the area identifier on at least one uplink carrier frequency point within at least one time period. Thus, when the terminal device is in the first area, it will only use the P parameter corresponding to the first uplink carrier frequency point within the first time period when transmitting a random access message on the first uplink carrier frequency point. CMAX,f,c Random access is performed. The first time period is any one of at least one time period, and the first uplink carrier frequency is any one of at least one uplink carrier frequency. This further reduces the impact of power limiting and improves the accuracy of power limiting.

[0152] In one possible implementation, the first NTN device can send its configuration message to the terminal device, and can also receive the configuration message from the second NTN device and send the second NTN device's configuration message to the terminal device. The terminal device can send a random access request message to the second NTN device based on the rate control parameters corresponding to the multiple regions indicated in the second NTN device's configuration message, or send a random access request message to the first NTN device based on the power control parameters corresponding to the multiple regions indicated in the first NTN device's configuration message.

[0153] The communication method provided in the embodiments of this application has been described above. The execution subject for performing the above communication method will be described below.

[0154] Figure 8 shows a schematic block diagram of a communication device 800 provided in an embodiment of this application. This communication device can be applied to the terminal devices in the method embodiments of Figures 4, 6, and 7. The communication device 800 includes:

[0155] The receiving module 810 is used to receive configuration information, which is used to indicate power control parameters corresponding to multiple regions respectively; the multiple regions are divided based on the relative positions between the non-terrestrial network (NTN) equipment and the protected receiving device; when the preamble transmission power of the terminal equipment is greater than or equal to a power threshold, it interferes with the protected receiving device, and the power control parameters are used to indicate the preamble transmission power, where the preamble transmission power is less than the power threshold.

[0156] The sending module 820 is configured to send a random access request message to the NTN device based on the power control parameters corresponding to the first region in the case of a first region, wherein the plurality of regions includes the first region.

[0157] In one possible implementation, the first region is characterized by at least one of the following: the longitude range of the terminal device, the latitude range of the terminal device, the beam identifier of the NTN device, the azimuth range of the terminal device relative to the NTN device, the elevation range of the terminal device relative to the NTN device, or the altitude of the terminal device.

[0158] In one possible implementation, the configuration information for indicating power control parameters corresponding to multiple regions includes: the configuration information for indicating the power control parameters corresponding to the multiple regions at at least one time period and / or at least one uplink carrier frequency point.

[0159] In one possible implementation, the sending module 820 is further configured to send the random access request message to the NTN device based on default power control parameters when not in the multiple regions.

[0160] In one possible implementation, the sending module 820 is further configured to send the random access request message to the NTN device based on default power control parameters in the first region, but not in the at least one time period corresponding to the first region and / or on the at least one uplink carrier frequency point.

[0161] In one possible implementation, the power control parameter includes at least one of the following: output power threshold P CMAX,f,c Uplink power spectral density (PSD) or preamble received target power (P) PRACH,target,f,c .

[0162] Figure 9 shows a schematic block diagram of another communication device 900 provided in an embodiment of this application. This communication device can be applied to the NTN device in any of the method embodiments of Figures 4, 6, and 7. The communication device 900 includes:

[0163] The transmitting module 910 is used to transmit configuration information, which is used to indicate power control parameters corresponding to multiple regions respectively; the multiple regions are divided based on the relative positions between the non-terrestrial network (NTN) equipment and the protected receiving device; when the preamble transmission power of the terminal equipment is greater than or equal to the power threshold, it interferes with the protected receiving device, and the power control parameters are used to indicate the preamble transmission power, where the preamble transmission power is less than the power threshold.

[0164] The receiving module 920 receives a random access request message from a terminal device. The random access request message is sent by the terminal device based on power control parameters corresponding to a first region. The terminal device is located in the first region, and the plurality of regions includes the first region.

[0165] In one possible implementation, the first region is characterized by at least one of the following: the longitude range of the terminal device, the latitude range of the terminal device, the beam identifier of the NTN device, the azimuth range of the terminal device relative to the NTN device, the elevation range of the terminal device relative to the NTN device, or the altitude of the terminal device.

[0166] In one possible implementation, the configuration information for indicating power control parameters corresponding to multiple regions includes: the configuration information for indicating the power control parameters corresponding to the multiple regions at at least one time period and / or at least one uplink carrier frequency point.

[0167] In one possible implementation, the power control parameter includes at least one of the following: output power threshold P CMAX,f,c Uplink power spectral density (PSD) or preamble received target power (P) PRACH,target,f,c .

[0168] Figure 10 shows a schematic block diagram of another communication device 1000 provided in an embodiment of this application. The communication device 1000 can be applied to a terminal device or an NTN device. The communication device 1000 includes a processor 1010, which implements the communication method provided in the embodiment of this application through logic circuits or executing code instructions.

[0169] Optionally, the communication device 1000 may further include an interface circuit 1020. The processor 1010 and the interface circuit 1020 are coupled to each other. It is understood that the interface circuit 1020 may be a transceiver or an input / output interface.

[0170] Optionally, the communication device 1000 may further include a memory 1030 for storing instructions executed by the processor 1010, or storing input data required by the processor 1010 to execute instructions, or storing data generated after the processor 1010 executes instructions.

[0171] The aforementioned processor 1010 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by software instructions. The aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0172] This application also provides a communication system, including a terminal device and an NTN device in the communication method provided in this application.

[0173] This application also provides a computer-readable storage medium storing a computer program for implementing the methods in the above-described method embodiments. When the computer program is run on a computer, the computer can implement the methods in the above-described method embodiments.

[0174] This application also provides a computer program product, which includes computer program code. When the computer program code is run on a computer, the method in the above method embodiments is executed.

[0175] This application also provides a chip, including a processor connected to a memory for storing computer programs, and the processor for executing the computer programs stored in the memory, so that the chip performs the methods described in the above method embodiments.

[0176] It should be understood that in the embodiments of this application, the designations "first", "second", etc. are only for distinguishing different objects, such as different terminal devices or different network devices, and do not constitute a limitation on the scope of the embodiments of this application. The embodiments of this application are not limited thereto.

[0177] Furthermore, the term "and / or" in this application 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. The term "at least one" in this application can represent "one" and "two or more." For example, A, B, and C can represent: A existing alone, B existing alone, C existing alone, A and B existing simultaneously, A and C existing simultaneously, C and B existing simultaneously, and A, B, and C existing simultaneously.

[0178] In this embodiment of the application, expressions such as "A includes B" are used to indicate that A may or may not include other items besides B. When other items are not included, it can be understood as "A is B", in which case "A" can be replaced with "B".

[0179] In the embodiments of this application, "send" and "receive" indicate the direction of signal transmission. For example, "send information to XX" can be understood as the destination of the information being XX, which may include direct transmission via the air interface or indirect transmission via the air interface by other units or modules. "Receive information from YY" can be understood as the source of the information being YY, which may include direct reception from YY via the air interface or indirect reception from YY via the air interface by other units or modules. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface.

[0180] In other words, sending and receiving can occur between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules, or hardware modules within the device via buses, wiring, or interfaces.

[0181] It is understandable that information may undergo necessary processing, such as encoding and modulation, between the source and destination, but the destination can understand the valid information from the source. Similar statements in this application can be interpreted in a similar way and will not be elaborated further.

[0182] In the embodiments of this application, "instruction" can include direct and indirect instructions, as well as explicit and implicit instructions. The information indicated by a certain piece of information (hereinafter referred to as instruction information) is called the information to be instructed. In specific implementation, 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 indirectly indicate the information to be instructed by indicating other information, where there is an association between the other information and the information to be instructed; or it can indicate only a part of the information to be instructed, while the other parts are known or pre-agreed upon. For example, the instruction can be implemented by using a pre-agreed (e.g., protocol predefined) arrangement of various information, thereby reducing the instruction overhead to a certain extent. This application does not limit the specific method of instruction. It is understood that for the sender of the instruction information, the instruction information can be used to indicate the information to be instructed; for the receiver of the instruction information, the instruction information can be used to determine the information to be instructed.

[0183] In this application, unless otherwise specified, the same or similar parts between the various embodiments can be referred to each other. In the various embodiments of this application, and in the various implementation methods / methods / implementations within each embodiment, unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments and between the various implementation methods / methods / implementations within each embodiment are consistent and can be mutually referenced. The technical features in different embodiments and the various implementation methods / methods / implementations within each embodiment can be combined according to their inherent logical relationships to form new embodiments, implementation methods, methods, or implementation approaches. The embodiments described below do not constitute a limitation on the scope of protection of this application.

[0184] 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.

[0185] Those skilled in the art will clearly 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.

[0186] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, 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 coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0187] 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.

[0188] 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.

[0189] 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, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0190] 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, Applied to terminal devices, including: The system receives configuration information, which indicates power control parameters corresponding to multiple regions. These regions are divided based on the relative positions between the non-terrestrial network (NTN) equipment and the protected receiving device. If the preamble transmit power of the terminal equipment is greater than or equal to a power threshold, it interferes with the protected receiving device. The power control parameters indicate the preamble transmit power, which is less than the power threshold. In the case of the first region, a random access request message is sent to the NTN device based on the power control parameters corresponding to the first region, wherein the plurality of regions includes the first region.

2. The method according to claim 1, characterized in that, The first region is characterized by at least one of the following methods: the longitude range of the terminal device, the latitude range of the terminal device, the beam identifier of the NTN device, the azimuth range of the terminal device relative to the NTN device, the elevation range of the terminal device relative to the NTN device, or the altitude of the terminal device.

3. The method according to claim 1, characterized in that, The configuration information is used to indicate the power control parameters corresponding to multiple regions, including: The configuration information is used to indicate the power control parameters corresponding to at least one time period and / or at least one uplink carrier frequency point for the plurality of regions.

4. The method according to any one of claims 1-3, characterized in that, The method further includes: In the absence of the aforementioned multiple regions, the random access request message is sent to the NTN device based on the default power control parameters.

5. The method according to claim 3, characterized in that, The method further includes: In the first region, but not during the at least one time period corresponding to the first region and / or on the at least one uplink carrier frequency, the random access request message is sent to the NTN device based on the default power control parameters.

6. The method according to any one of claims 1-5, characterized in that, The power control parameters include at least one of the following: output power threshold P CMAX,f,c Uplink power spectral density (PSD) or preamble received target power (P) PRACH,target,f,c .

7. A communication method, characterized in that, Applications to NTN devices used in non-terrestrial networks include: Send configuration information, which is used to indicate the power control parameters corresponding to multiple regions respectively; the multiple regions are divided based on the relative position between the NTN device and the protected receiving device; when the preamble transmit power of the terminal device is greater than or equal to the power threshold, it will cause interference to the protected receiving device, and the power control parameters are used to indicate the preamble transmit power, where the preamble transmit power is less than the power threshold; A random access request message is received from a terminal device, the random access request message being sent by the terminal device based on power control parameters corresponding to a first region, the terminal device being located in the first region, and the plurality of regions including the first region.

8. The method according to claim 7, characterized in that, The first region is characterized by at least one of the following methods: the longitude range of the terminal device, the latitude range of the terminal device, the beam identifier of the NTN device, the azimuth range of the terminal device relative to the NTN device, the elevation range of the terminal device relative to the NTN device, or the altitude of the terminal device.

9. The method according to claim 7, characterized in that, The configuration information is used to indicate the power control parameters corresponding to multiple regions, including: The configuration information is used to indicate the power control parameters corresponding to at least one time period and / or at least one uplink carrier frequency point for multiple regions.

10. The method according to any one of claims 7-9, characterized in that, The power control parameters include at least one of the following: output power threshold P CMAX,f,c Uplink power spectral density (PSD) or preamble received target power (P) PRACH,target,f,c .

11. A communication device, characterized in that, It includes a unit for performing the method as described in any one of claims 1-6, or a unit for performing the method as described in any one of claims 7-10.

12. A communication device, characterized in that, include: A processor, the processor being configured to implement the method as described in any one of claims 1-6, or to implement the method as described in any one of claims 7-10.

13. A communication system, characterized in that, It includes a terminal device and an NTN device, wherein the terminal device is used to perform the method as described in any one of claims 1-6, and the NTN device is used to perform the method as described in any one of claims 7-10.

14. A computer-readable storage medium, characterized in that, include: The computer-readable medium stores a computer program; When the computer program is run on a computer or processor, it causes the method of any one of claims 1-10 to be performed.

15. A computer program product, characterized in that, Includes a computer program, which, when executed, causes the method as described in any one of claims 1-10 to be implemented.

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