Communication method and device

Abstract

The invention discloses a communication method and device, relates to the technical field of communication, and is used for realizing packet switching of terminal equipment and reducing resource conflicts. The method comprises: a terminal device receiving first information, the first information comprising uplink transmission authorization of a first network device corresponding to at least one terminal device group in a first area, the first area being an area covered by a second network device, the second network device being a network device accessed by the terminal device, the first network equipment is to-be-switched network equipment of the terminal equipment; and the terminal equipment sends uplink data to the first network equipment according to the first information. Based on the scheme of the invention, the terminal equipment in the first area can use the corresponding uplink transmission authorization to send the uplink data to the first network equipment according to the first information, thereby achieving the grouping switching of the terminal equipment, reducing the collision of the uplink transmission resources selected by the terminal equipment when the terminal equipment is switched to the first network equipment in batches, and improving the switching efficiency. And normal operation of terminal communication is ensured.

Description

TECHNICAL FIELD

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

[0002] With the development of information technology, more urgent requirements are put forward for efficient, mobile, and diverse communication. At present, a development focus in the field of wireless communication is global mobile communication, and an important part of global mobile communication is satellite communication. Satellite communication plays an irreplaceable role in some important fields, such as space communication, aviation communication, maritime communication, etc. Satellite communication has the characteristics of long communication distance, large coverage area, and flexible networking, and can provide services for both fixed terminals and various mobile terminals.

[0003] Satellites move at high speed in space, and the moving speed of terminal devices on the ground is slow relative to the satellites. Therefore, in the satellite communication scenario, there are frequent mobile management operations such as terminal switching and tracking area updating. In view of this, a satellite gazing mode is proposed. The so-called gazing mode refers to the uninterrupted on-orbit movement of the satellite, and the satellite-borne antenna beam can always point to a certain visible ground target in the antenna coverage area. By using the gazing mode, the communication time can be prolonged when the satellite is visible, the power can be concentrated, the energy waste can be reduced, the reliability and security of satellite-ground communication can be improved, and frequent mobile management operations including terminal switching can be avoided. However, in a satellite system supporting the gazing mode, if the satellite beam providing services for a certain area moves out of the area due to the movement of the satellite, the satellite will trigger all terminal devices in the service area to perform satellite switching. Based on the current switching mode, all terminal devices in the service area will simultaneously initiate switching to the target satellite, thereby causing a signaling storm problem, causing network congestion, and even affecting the normal communication. SUMMARY

[0004] The present application provides a communication method and device to realize the grouping switching of terminal devices and reduce resource conflicts.

[0005] In a first aspect, the present application provides a communication method, which can be executed by a terminal device or a module (such as a processor, a chip, or a chip system) applied in the terminal device. Taking the terminal device as an example, the method comprises: receiving, by the terminal device, first information, wherein the first information comprises an uplink transmission grant of a first network device corresponding to at least one terminal device group in a first area, the first area is an area covered by a second network device, the second network device is a network device accessed by the terminal device, the first network device is a network device to be switched by the terminal device, and the terminal device belongs to the at least one terminal device group; and sending, by the terminal device, uplink data to the first network device according to the first information.

[0006] By the above method, the first information received by the terminal device includes the uplink transmission authorization of the first network device corresponding to each terminal device group in the first region, and therefore, the terminal device in the first region can send uplink data to the first network device according to the first information using the respective corresponding uplink transmission authorization, so as to realize the grouping switching of the first network device, reduce the collision of the terminal device selecting uplink transmission resources when batch switching the first network device, and ensure the normal communication of the terminal.

[0007] In a possible design, the terminal device receives the first information, which can be specifically: the terminal device receives the first information sent by the first network device, or the terminal device receives the first information sent by the second network device, and the first information is obtained by the second network device from the first network device.

[0008] By the above design, the first information can be configured by the first network device to be switched, and the first information can be indicated to the terminal device by the first network device to be switched or the second network device that has been accessed currently, so as to improve the flexibility of the communication method.

[0009] In a possible design, the uplink data is used for the terminal device to access the first network device.

[0010] By the above design, the uplink transmission resources of the terminal device in the first region accessing the first network device can be grouped, and the grouping access manner can improve the success probability of the terminal device in the first region accessing the first network device.

[0011] In a possible design, different terminal device groups correspond to different uplink transmission authorizations and / or spatial domain resources.

[0012] By the above design, different terminal device groups can use different uplink transmission authorizations, or use different spatial domain resources, or use different uplink transmission authorizations and spatial domain resources, to send uplink data to the first network device. Based on this, the terminal devices of different terminal device groups can perform grouping switching on at least one of the time domain resources, the frequency domain resources and the spatial domain resources, so as to avoid the collision problem of selecting switching resources between different terminal device groups.

[0013] In a possible design, at least one of the following parameters of at least one terminal device group is different: terminal type, geographical location, service type, system bandwidth, number of antennas, power consumption level, duplex type, mobility.

[0014] By the above design, different parameters can be selected to divide at least one terminal device group according to actual needs, so as to improve the flexibility of grouping switching.

[0015] In one possible design, the terminal device sends uplink data to the first network device based on the first information. Specifically, it can be: the terminal device sends uplink data to the first network device based on the uplink transmission authorization corresponding to the first terminal device group to which the terminal device belongs, wherein the first terminal device group is one of at least one terminal device group.

[0016] Through the above design, the terminal devices in the first area can use the uplink transmission authorization of their respective groups on their own and send uplink data to the first network device without conflict, thereby improving the success probability of switching.

[0017] In a further possible design, the uplink transmission authorization corresponding to the first terminal device group includes at least one uplink transmission resource, and the terminal device sends uplink data to the first network device according to the uplink transmission authorization corresponding to the first terminal device group to which the terminal device belongs. Specifically, it can be: the terminal device determines the first uplink transmission resource corresponding to the terminal device from at least one uplink transmission resource according to the identifier of the terminal device, and uses the first uplink transmission resource to send uplink data to the first network device.

[0018] Through the above design, the terminal devices in a terminal device group can use their respective corresponding uplink transmission resources for uplink transmission to ensure that resources switched within the group do not conflict.

[0019] In a further possible design, the identifier of the terminal device is a cell-radio network temporary identifier (C-RNTI) of the terminal device.

[0020] Through the above design, C-RNTI is a unique identifier issued by the cell to the terminal device. By selecting the uplink transmission resource corresponding to the terminal device through C-RNTI, it can be ensured that an uplink transmission resource is only allocated to one terminal device and will not be repeatedly allocated to different terminal devices, thereby effectively avoiding resource conflicts during intra-group switching.

[0021] In one possible design, the terminal device can also receive third information from the second network device, where the third information includes an uplink synchronization adjustment parameter of the first network device. The terminal device adjusts the uplink transmission parameter of the terminal device based on the uplink synchronization adjustment parameter.

[0022] Through the above design, the second network device can indicate the uplink synchronization adjustment parameters of the first network device to the terminal device. The terminal device can directly perform uplink synchronization with the first network device to be switched according to the instruction of the second network device, and obtain the same uplink transmission parameters as the first network device. In this way, the terminal device can realize uplink transmission with the first network device based on the same uplink transmission parameters as the first network device.

[0023] In a second aspect, the present application provides a communication method, which can be performed by a first network device or a module (such as a processor, a chip or a chip system) applied in the first network device, and the first network device is a network device to be handed over by a terminal device. Taking the first network device as an example, the method includes: the first network device sends first information, the first information includes uplink transmission authorization of the first network device corresponding to at least one terminal device group in a first area, the first area is an area covered by a second network device, the second network device is a network device accessed by the terminal device, and the terminal device belongs to the at least one terminal device group; and the first network device receives uplink data sent by the terminal device.

[0024] In a possible design, the first network device sends the first information, and specifically, the first network device can send the first information to the terminal device, or the first network device can send the first information to the second network device, and the second network device forwards the first information to the terminal device.

[0025] In a possible design, the uplink data is used for the terminal device to access the first network device.

[0026] In a possible design, different terminal device groups correspond to different uplink transmission authorizations and / or spatial domain resources.

[0027] In a possible design, at least one parameter of the at least one terminal device group is different, and the at least one parameter includes a terminal type, a geographical position, a service type, a system bandwidth, a number of antennas, a power consumption level, a duplex type and mobility.

[0028] In a third aspect, the present application provides a communication method, which can be performed by a second network device or a module (such as a processor, a chip or a chip system) applied in the second network device, and the second network device is a network device accessed by a terminal device. Taking the second network device as an example, the method includes: the second network device receives first information sent by a first network device, the first information includes uplink transmission authorization of the first network device corresponding to at least one terminal device group in a first area, the first area is an area covered by the second network device, the first network device is a network device to be handed over by the terminal device, and the terminal device belongs to the at least one terminal device group; and the second network device sends the first information to the terminal device, and the first information is used for the terminal device to send uplink data to the first network device.

[0029] In a possible design, the second network device can further send third information to the terminal device, the third information includes an uplink synchronization adjustment parameter of the first network device, and the uplink synchronization adjustment parameter is used for the terminal device to perform uplink synchronization with the first network device.

[0030] In a possible design, the uplink data is used for the terminal device to access the first network device.

[0031] In a possible design, different terminal device groups correspond to different uplink transmission grants and / or spatial domain resources.

[0032] In a possible design, at least one parameter of at least one terminal device group is different, for example, terminal type, geographic location, service type, system bandwidth, number of antennas, power consumption level, duplex type, mobility, etc.

[0033] In a fourth aspect, the present application provides a communication method, which can be executed by a terminal device or a module (such as a processor, a chip or a chip system) applied in the terminal device. Taking the terminal device as an example, the method includes: the terminal device receives second information from a second network device, the second information including first time information and second time information, the first time information covering at least one random access occasion of a first network device, and the second time information covering a random access response window of the first network device, the first network device being a network device to be synchronized by the terminal device, and the second network device being a network device accessed by the terminal device; and the terminal device performs uplink synchronization with the first network device according to the first time information and the second time information.

[0034] Through the above method, the second network device can configure time information for the terminal device to perform uplink synchronization with the first network device, and the terminal device can complete uplink synchronization with the first network device on corresponding time domain resources according to the time information, so that the terminal device can implement uplink transmission with the first network device based on the same uplink transmission parameters as the first network device.

[0035] In a possible design, the uplink synchronization of the terminal device with the first network device can be implemented in different stages, for example:

[0036] In one example, the uplink synchronization can be implemented in a random access process, in which case the terminal device performs uplink synchronization with the first network device according to the first time information and the second time information, specifically: the terminal device sends a random access request to the first network device according to the first time information, and receives a random access response from the first network device according to the second time information, the random access response including an uplink synchronization adjustment parameter; and the terminal device adjusts the uplink transmission parameters of the terminal device according to the uplink synchronization adjustment parameter.

[0037] Through the above example, the terminal device can obtain the same uplink transmission parameters as the first network device through uplink synchronization before initially accessing the first network device, thereby providing support for uplink transmission of the terminal device to the first network device.

[0038] In another example, the uplink synchronization can be implemented in the channel measurement process. In this case, the terminal device performs uplink synchronization with the first network device according to the first time information and the second time information. Specifically, the terminal device sends a channel sounding reference signal to the first network device according to the first time information, and receives a channel sounding response signal from the first network device according to the second time information, wherein the channel sounding response signal includes an uplink synchronization adjustment parameter; and the terminal device adjusts the uplink transmission parameter of the terminal device according to the uplink synchronization adjustment parameter.

[0039] Through the above example, after the terminal device accesses the first network device, the terminal device can perform timing maintenance of the uplink transmission parameter through the channel measurement process.

[0040] In a possible design, the terminal device can further receive third information from the second network device, wherein the third information includes the uplink synchronization adjustment parameter of the first network device; and the terminal device adjusts the uplink transmission parameter of the terminal device according to the uplink synchronization adjustment parameter.

[0041] Through the above design, the second network device can indicate the uplink synchronization adjustment parameter of the first network device to the terminal device, and the terminal device can directly perform uplink synchronization with the first network device according to the indication of the second network device.

[0042] In a possible design, the terminal device can further receive fourth information from the second network device, wherein the fourth information is used to indicate a target frequency point of the first network device; and the terminal device switches the working frequency point of the terminal device to the target frequency point according to the fourth information.

[0043] Through the above design, the terminal device can switch the working frequency point to the target frequency point of the first network device within the time interval indicated by the second information according to the fourth information, so as to initiate uplink synchronization with the first network device at the target frequency point.

[0044] In a fifth aspect, a communication method is provided. The method can be performed by a first network device or a module (such as a processor, a chip or a chip system) applied in the first network device. Taking the first network device as an example, the method includes: the first network device receives second information from a second network device, wherein the second information includes first time information and second time information, the first time information covers at least one random access occasion of the first network device, and the second time information covers a random access response window of the first network device; the first network device is a network device to be synchronized by a terminal device, and the second network device is a network device accessed by the terminal device; and the first network device performs uplink synchronization with the terminal device according to the first time information and the second time information.

[0045] In a possible design, the first network device performs uplink synchronization with the terminal device according to the first time information and the second time information. Specifically, the first network device receives a first random access request sent by the terminal device according to the first time information, and sends a random access response to the terminal device according to the second time information, where the random access response includes an uplink synchronization adjustment parameter, and the uplink synchronization adjustment parameter is used by the terminal device to adjust an uplink transmission parameter of the terminal device.

[0046] In a possible design, the first network device performs uplink synchronization with the terminal device according to the first time information and the second time information. Specifically, the first network device receives a channel sounding reference signal sent by the terminal device according to the first time information, and sends a channel sounding response signal to the terminal device according to the second time information, where the channel sounding response signal includes an uplink synchronization adjustment parameter, and the uplink synchronization adjustment parameter is used by the terminal device to adjust an uplink transmission parameter of the terminal device.

[0047] In a possible design, the first network device can further send third information to the second network device, where the third information includes the uplink synchronization adjustment parameter, and the uplink synchronization adjustment parameter is used by the second network device to instruct the terminal device to perform uplink synchronization with the first network device.

[0048] In a possible design, the first network device can further send fourth information to the second network device, where the fourth information is used to instruct the target frequency point of the first network device, and the target frequency point is used by the terminal device to switch a working frequency point.

[0049] In a sixth aspect, a communication method is provided. The method can be performed by a second network device or a module (e.g., a processor, a chip, or a chip system) applied in the second network device. Taking the second network device as an example, the method includes: sending, by the second network device, second information to a terminal device and / or a first network device, where the second information includes first time information and second time information, the first time information covers at least one random access occasion of the first network device, the second time information covers a random access response window of the first network device, the first network device is a network device to be synchronized by the terminal device, the second network device is a network device accessed by the terminal device, and the second information is used by the terminal device and the first network device to perform uplink synchronization.

[0050] In a possible design, the second network device can further receive third information sent by the first network device, and send the third information to the terminal device, where the third information includes an uplink synchronization adjustment parameter, and the uplink synchronization adjustment parameter is used by the terminal device to adjust an uplink transmission parameter of the terminal device.

[0051] In a possible design, the second network device can further receive fourth information sent by the first network device, where the fourth information is used to indicate a target frequency point of the first network device, and the fourth information is used for the terminal device to switch a working frequency point.

[0052] In a seventh aspect, this application provides a communication method, which can be executed by a terminal device or a module (such as a processor, a chip or a chip system) applied in the terminal device. Taking the terminal device as an example, the method includes: the terminal device receives fourth information, where the fourth information includes a mapping relationship between air interface resources of a first network device and air interface resources of a second network device, the air interface resources of the second network device include air interface resources allocated by the second network device for a first region, the first region is a region covered by the second network device, the first network device is a network device to be switched by the terminal device, the second network device is a network device accessed by the terminal device, and the terminal device is located in the first region; and the terminal device sends uplink data to the first network device according to the fourth information.

[0053] Through the above method, the fourth information received by the terminal device includes the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device, and the terminal device can select corresponding air interface resources to switch from the second network device to the first network device according to the mapping relationship. In this way, by indicating resource allocation in the next stage to the terminal device, signaling overhead of re-scheduling can be avoided.

[0054] In a possible design, the terminal device receives the fourth information, which can be specifically: the terminal device receives the fourth information from the first network device or the second network device.

[0055] Through the above design, the fourth information can be indicated to the terminal device through the second network device that has been accessed or the first network device that is to be accessed, so as to improve flexibility of the communication method.

[0056] In a possible design, the terminal device sends uplink data to the first network device according to the fourth information, which can be specifically: the terminal device determines air interface resources allocated by the first network device for the first region according to the mapping relationship and the air interface resources allocated by the second network device for the first region, and sends uplink data to the first network device according to the air interface resources allocated by the first network device for the first region.

[0057] Through the above design, the terminal device can determine, according to the fourth information, allocation of air interface resources of the first network device to be switched for the first region, and then successfully switch to the first network device according to the allocation of the air interface resources.

[0058] In a possible design, the terminal device can further receive fifth information from the first network device, where the fifth information is used to indicate a service period of the first network device for the first region; and the terminal device can send uplink data to the first network device in the service period of the first network device according to the fifth information.

[0059] Through the above design, the terminal device can learn the service period of the first network device, and thus can communicate with the first network device only in the service period, thereby avoiding unnecessary communication overhead.

[0060] In a possible design, the terminal device can further receive sixth information from the first network device, where the sixth information is used to indicate a power adjustment parameter; and the terminal device can send uplink data to the first network device using target power according to the power adjustment parameter.

[0061] Through the above design, the terminal device can learn the power adjustment parameter corresponding to the first network device, and can adjust the transmit power to the target power at which the first network device can receive information according to the power adjustment parameter, so as to ensure that the terminal device can successfully communicate with the first network device.

[0062] In an eighth aspect, this application provides a communication method, which can be executed by a first network device or a module (such as a processor, a chip or a chip system) applied in the first network device. Taking the first network device as an example, the method includes: the first network device sends fourth information to a terminal device, where the fourth information includes a mapping relationship between air interface resources of the first network device and air interface resources of a second network device, the air interface resources of the second network device include air interface resources allocated by the second network device for a first region, the first region is a region covered by the second network device, the first network device is a network device to which the terminal device is to be handed over, the second network device is a network device accessed by the terminal device, and the terminal device is located in the first region; and the first network device receives uplink data sent by the terminal device.

[0063] In a possible design, before the first network device sends the fourth information to the terminal device, the first network device can further receive seventh information sent by the second network device, where the seventh information is used to indicate the air interface resources allocated by the second network device for the first region, and the first network device can establish the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device according to the seventh information and the air interface resources of the first network device.

[0064] Through the above design, the first network device can interact with the second network device to exchange resource scheduling information, so that the first network device can establish the mapping relationship according to the resource scheduling information of the second network device and indicate the mapping relationship to the terminal device.

[0065] In a possible design, the seventh information includes at least one of a cell-level parameter, a beam-level parameter, and a user-level parameter.

[0066] In a possible design, the first network device receives uplink data sent by the terminal device, and specifically, the first network device receives the uplink data sent by the terminal device according to air interface resources allocated by the first network device for the first area, where the air interface resources allocated by the first network device for the first area are obtained according to the mapping relationship and air interface resources allocated by the second network device for the first area.

[0067] In a possible design, the first network device can further send fifth information to the terminal device, where the fifth information is used to indicate a service period of the first network device for the first area, and the fifth information is used by the terminal device to send uplink data to the first network device within the service period of the first network device.

[0068] In a possible design, the first network device can further send sixth information to the terminal device, where the sixth information is used to indicate a power adjustment parameter, and the power adjustment parameter is used by the terminal device to send uplink data to the first network device using target power.

[0069] In a ninth aspect, this application provides a communication method, which can be executed by a second network device or a module (such as a processor, a chip or a chip system) applied in the second network device. Taking the second network device as an example, the method includes: the second network device sends fourth information to a terminal device, where the fourth information includes a mapping relationship between air interface resources of a first network device and air interface resources of the second network device, the air interface resources of the second network device include air interface resources allocated by the second network device for a first area, the first area is an area covered by the second network device, the first network device is a network device to be switched by the terminal device, the second network device is a network device accessed by the terminal device, and the terminal device is located in the first area; and the second network device sends seventh information to the first network device, where the seventh information is used to indicate air interface resources allocated by the second network device for the first area.

[0070] In a possible design, before the second network device sends the fourth information to the terminal device, the second network device can first receive eighth information sent by the first network device, where the eighth information is used to indicate air interface resources of the first network device; and the second network device can establish the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device according to the eighth information and the air interface resources of the second network device.

[0071] In a possible design, the eighth information includes at least one of a cell-level parameter, a beam-level parameter, and a user-level parameter.

[0072] In a tenth aspect, the present disclosure provides a communication apparatus, which can be the terminal device, the first network device or the second network device. The communication apparatus can include units or modules for performing the steps of any of the first aspect to the ninth aspect. For example, the communication apparatus can include a communication unit and a processing unit. The communication unit can be configured to perform the operations related to receiving and transmitting. The processing unit can be configured to perform the processing operations.

[0073] In one design, the communication apparatus can be a communication chip. The processing unit can be one or more processors or processor cores. The communication unit can be input / output circuits, input / output interfaces or antenna ports of the communication chip.

[0074] In another design, the communication unit can be a transmitter and a receiver. Or the communication unit can be a transmitter and a receiver.

[0075] In an eleventh aspect, the present disclosure provides a communication apparatus, which can be the terminal device, the first network device or the second network device. The communication apparatus can include a transceiver and a processor. The transceiver can be configured to receive and transmit signals. The processor can be configured to execute program instructions to cause the communication apparatus to perform the method of any of the first aspect to the ninth aspect. Optionally, the communication apparatus can further include a memory. The memory can be configured to store program instructions. The processor can read the program instructions in the memory to cause the communication apparatus to perform the method of any of the first aspect to the ninth aspect.

[0076] In one design, the processor can be one or more processors. The memory can be one or more memories.

[0077] In one design, the memory can be integrated with the processor. Or the memory can be separate from the processor.

[0078] In one design, the transceiver can include a transmitter and a receiver.

[0079] In a twelfth aspect, the present disclosure provides a communication apparatus, which can be the terminal device, the first network device or the second network device. The communication apparatus can include a processor. Optionally, the communication apparatus can further include a communication interface. The processor can be coupled to the communication interface. Optionally, the communication apparatus can further include a memory. The processor can be coupled to the memory. The processor can read program instructions in the memory and invoke the communication interface to communicate with other communication apparatuses to perform the method of any of the first aspect to the ninth aspect.

[0080] In one design, when the communication apparatus is a terminal device, a first network device, or a second network device, the communication interface can be a transceiver, or an input / output interface. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0081] In another design, when the communication apparatus is a chip or a chip system, the communication interface can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or related circuitry, etc. on the chip or chip system. The processor can also be implemented as a processing circuit or a logic circuit.

[0082] In a thirteenth aspect, a communication apparatus is provided. The communication apparatus can include a processor, and can also include a storage medium storing instructions. The instructions, when executed by the processor, can be used to implement the method of any one of the first aspect to the ninth aspect. The communication apparatus can be a chip system. The chip system can be composed of a chip, or can include a chip and other discrete devices.

[0083] In a fourteenth aspect, a communication system is provided. The communication system can include a terminal device for implementing the first aspect, a first network device for implementing the second aspect, and a second network device for implementing the third aspect; or a terminal device for implementing the fourth aspect, a first network device for implementing the fifth aspect, and a second network device for implementing the sixth aspect; or a terminal device for implementing the seventh aspect, a first network device for implementing the eighth aspect, and a second network device for implementing the ninth aspect.

[0084] In a fifteenth aspect, a computer program product is provided. When the computer program product is run on a computer, the computer program product can cause the computer to execute the method of any one of the first aspect to the ninth aspect. Optionally, the computer can be a communication apparatus such as a terminal device, a first network device, or a second network device.

[0085] In a sixteenth aspect, a computer readable storage medium is provided. The computer readable storage medium can store a computer program. When the computer program is executed by a computer, the computer program can cause the computer to execute the method of any one of the first aspect to the ninth aspect. Optionally, the computer can be a communication apparatus such as a terminal device, a first network device, or a second network device.

[0086] In the seventeenth aspect, the present application provides a chip, which is used to read a computer program stored in a memory and execute the method provided in any one of the first to ninth aspects above. Optionally, the chip may include a processor, which is coupled to the memory and is used to read the computer program stored in the memory and implement the method provided in any one of the first to ninth aspects above. Optionally, the chip may also include components such as a memory, a communication interface, and a power supply module. The memory is used to store computer programs; the communication interface is used to receive and send data; and the power supply unit is used to power the processor.

[0087] In an eighteenth aspect, the present application provides a chip system, comprising a processor configured to support a computer device in implementing the method provided in any one of aspects one to nine. In one possible design, the chip system further comprises a memory configured to store programs and data necessary for the computer device. The chip system may be composed of a chip alone, or may include a chip and other discrete components.

[0088] The technical effects that can be achieved in the above-mentioned second to third aspects, fifth to sixth aspects, and eighth to eighteenth aspects can refer to the description of the beneficial effects in the above-mentioned first aspect, fourth aspect, and seventh aspect, and will not be repeated here one by one. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] Figure 1 A schematic diagram illustrating an architecture of a communication system provided by the present application is exemplified;

[0090] Figure 2 The following is a schematic diagram illustrating an architecture of an NTN communication system provided by the present application;

[0091] Figure 3 A schematic diagram illustrating an architecture of a satellite mobile communication system to which the present application is applicable is shown as an example;

[0092] Figure 4 A schematic diagram illustrating a satellite switching scenario provided by the present application is exemplified;

[0093] Figure 5 A flow chart showing an exemplary communication method according to the first embodiment;

[0094] Figure 6a A schematic diagram of a sending process of first information provided by implementation scheme 1 is exemplarily shown;

[0095] Figure 6b A schematic diagram illustrating another process flow of sending first information provided by the first embodiment is exemplified;

[0096] Figure 6cFig. 2 shows a schematic diagram of a sending flow of a first information according to an example of the first embodiment;

[0097] Figure 7 Fig. 3 shows a schematic diagram of a communication method according to an example of the second embodiment;

[0098] Figure 8 Fig. 4 shows a schematic diagram of time domain information of a second information according to an example of the second embodiment;

[0099] Figure 9 Fig. 5 shows a schematic diagram of an implementation flow of an uplink synchronization mode 1 according to an example of the second embodiment;

[0100] Figure 10 Fig. 6 shows a schematic diagram of a flow of a frequency switching according to an example of the second embodiment;

[0101] Figure 11 Fig. 7 shows a schematic diagram of time domain information of a random access request according to an example of the second embodiment;

[0102] Figure 12 Fig. 8 shows a schematic diagram of an implementation flow of an uplink synchronization mode 2 according to an example of the second embodiment;

[0103] Figure 13 Fig. 9 shows a schematic diagram of a communication method according to an example of the third embodiment;

[0104] Figure 14 Fig. 10 shows a schematic diagram of a communication method according to an example of the fourth embodiment;

[0105] Figure 15 Fig. 11 shows a schematic diagram of a sending flow of an eighth information according to an example of the fourth embodiment;

[0106] Figure 16 Fig. 12 shows a schematic diagram of a mapping relationship table of an air interface resource according to an example of the fourth embodiment;

[0107] Figure 17 Fig. 13 shows a schematic diagram of a sending flow of an eighth information according to another example of the fourth embodiment;

[0108] Figure 18 Fig. 14 shows a schematic diagram of a communication device according to an example of the present application;

[0109] Figure 19 Fig. 15 shows a schematic diagram of another communication device according to an example of the present application. DETAILED DESCRIPTION

[0110] In order to more clearly describe the technical scheme of the embodiments of the present application, the communication method and device provided by the embodiments of the present application are described in detail below with reference to the drawings.

[0111] The technology provided by the embodiments of the present application can be applied to various communication systems, such as a satellite communication system, a high altitude platform station (HAPS) communication system, a non-terrestrial network (NTN) system such as a drone, etc.; for example, an integrated communication and navigation (IcaN) system, a global navigation satellite system (GNSS), and an ultra-dense low earth orbit satellite communication system, etc. The communication system to which the present application is applied can be integrated with a ground communication system. The ground communication system may, for example, be a 4th generation (4G) communication system (for example, a long term evolution (LTE) system), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) communication system (for example, a new radio (NR) system), and a 6th generation (6G) communication system, etc.

[0112] A network element in a communication system can send a signal to another network element or receive a signal from another network element. The signal may, for example, include information, signaling, or data, etc. The network element may, for example, be replaced by an entity, a network entity, a device, a communication device, a communication module, a node, a communication node, etc. The embodiments of the present application are described by way of example with respect to a network element.

[0113] For example, a communication system may, for example, include at least one terminal device and at least one network device. The network device may, for example, send downlink data to the terminal device, and / or the terminal device may, for example, send uplink data to the network device. It should be understood that if the communication system includes a plurality of terminal devices, the plurality of terminal devices may, for example, also send data to each other, i.e., the sending network element and the receiving network element of the data may, for example, both be terminal devices. Similarly, if the communication system includes a plurality of network devices, the plurality of network devices may, for example, also send data to each other, i.e., the sending network element and the receiving network element of the data may, for example, both be network devices.

[0114] Referring to Figure 1 , an architecture schematic diagram of a communication system provided by the present application is exemplarily shown. The communication system may, for example, include at least one network device (such as 110a, 110b in Figure 1 ) and at least one terminal device (such as 120a, 120b in Figure 1120a, 120b, 120c, 120d, 120e, 120f in FIG). It should be understood that the communication system may include more or fewer network devices or terminal devices. The network devices or terminal devices may be hardware, or functionally divided software, or a combination of the two. Figure 1 As shown, network device 110a can send downlink data to terminal devices 120a, 120b, and 120c, and can also receive uplink data sent by terminal devices 120a, 120b, and 120c. Furthermore, terminal devices 120d, 120e, and 120f can also form a communication system; for example, terminal device 120d can send data to terminal device 120e or terminal device 120f. Network devices and terminal devices can communicate with each other through other devices or network elements; for example, network device 110a can send downlink data to terminal device 120d through network device 110b.

[0115] The network device in the embodiments of the present application is a device deployed in a radio access network (RAN) to provide wireless communication functions for terminal devices, which can also be referred to as a base station, and can also be referred to as a RAN node (or device). The network device can include various forms of macro base stations, micro base stations (also known as small stations), relay stations, or access points, etc. For example, some examples of access network devices are: evolved node B (eNB or eNodeB), radio network controller (RNC), node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB or home Node B, HNB), baseband unit (BBU), access point (AP) in a wireless fidelity (WIFI) system, wireless relay node, wireless backhaul node, transmission point (TP) or transmission reception point (TRP), satellite, unmanned aerial vehicle, etc. The network device can also be a base station (gNB) or TRP or TP in a 5G system, or one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G system. In addition, the network device can also be a network node constituting a gNB or a TP, such as a BBU, or a distributed unit (DU), etc. Alternatively, the network device can also be a device in a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, an Internet of Things (IoT), a vehicle-to-vehicle communication system, or other communication systems that undertakes a network side function. The network device can also be a next-generation base station in a 6th generation (6G) mobile communication system, or a base station in a future mobile communication system. In a communication system using different wireless access technologies, the names of devices with network device functions may vary, and the embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0116] In another possible scenario, multiple RAN nodes cooperate to assist a terminal to implement wireless access, and different RAN nodes respectively implement part of functions of a base station. For example, a RAN node can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately arranged, or can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0117] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an open central unit (O-CU) or an open CU, the DU can also be referred to as an open distributed unit (O-DU), the CU-CP can also be referred to as an open central unit control plane (O-CU-CP), the CU-UP can also be referred to as an open central unit user plane (O-CU-UP), and the RU can also be referred to as an open radio unit (O-RU). For the convenience of description, the CU, CU-CP, CU-UP, DU and RU are taken as examples for description in this application. Any one of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0118] The terminal device in the embodiments of the present application may also be referred to as user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, subscriber unit (SU), user station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc. It is a device that provides voice or data connectivity to users, and may also be an Internet of Things device. For example, the terminal device includes a handheld device (handset) with wireless communication function, a vehicle-mounted device, a wearable device, a computer device or other processing device connected to a wireless modem, etc. For example, some examples of terminal devices at present may be: mobile phones, smartphones, cellular phones, wireless data cards, personal digital assistants (PDAs), computers, tablet computers, notebook computers, PDAs, laptop computers, machine type communication (MTC) terminals, mobile internet devices (MIDs), wearable devices (such as smart watches, smart bracelets, pedometers, etc.), vehicle-mounted devices (such as cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed railways, etc.), virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, smart home devices (such as refrigerators, televisions, air conditioners, electric meters, etc.), intelligent robots, workshop equipment, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, and smart cities. The terminal device may be a wireless terminal in a city, a wireless terminal in a smart home, or an aerial device (e.g., an intelligent robot, a hot air balloon, a drone, an airplane). The terminal device may also be other devices with terminal functions, for example, a terminal device may also be a device that functions as a terminal in D2D communication.

[0119] In the embodiments of the present application, the functions of the terminal device can also be performed by a module (such as a chip or a modem) in the terminal device, or by a device containing the functions of the terminal device.

[0120] Based on Figure 1 Based on the description of the communication system architecture shown in the foregoing, the embodiments of the present application are exemplified by applying a non-terrestrial network (NTN) communication system. The NTN communication system includes nodes such as satellite networks, high-altitude platforms, and unmanned aerial vehicles, and has the advantages of global coverage, long-distance transmission, flexible networking, easy deployment, and no restriction by geographical conditions, and has been widely applied in many fields such as maritime communication, positioning and navigation, disaster relief, scientific experiments, video broadcasting, and earth observation. The ground 5G network and the satellite network are integrated with each other, complement each other's advantages, and together constitute a global seamless coverage of the sea, land, air, sky, and earth integrated communication network, which meets the user's demand for various services everywhere.

[0121] In the embodiments of the present application, the NTN communication takes the satellite communication as an example, or the NTN communication system takes the satellite system as an example. As shown in Figure 2 The NTN communication system includes a satellite 201 and a terminal device 202. The explanation of the terminal device 202 can refer to the related description of the terminal device described above. The satellite 201 can also be referred to as a high-altitude platform, a high-altitude aircraft, or a satellite base station. In terms of the relationship between the NTN communication system and the terrestrial network communication system, the satellite 201 can be regarded as one or more network devices in the architecture of the terrestrial network communication system. The satellite 201 provides communication services to the terminal device 202, and the satellite 201 can also be connected to a core network device. The structure and functions of the satellite 201 can also refer to the description of the network device described above. The communication mode between the satellite 201 and the terminal device 202 can also refer to the description in the foregoing Figure 1 In this regard, no further description is given. The scheme in the embodiments of the present application can also be applied directly or after slight modification in a method that can be thought of by those skilled in the art to the ground communication network, and no further description is given here.

[0122] The NTN communication system is taken as a satellite mobile communication system for example. Figure 3 The architecture of a satellite mobile communication system to which the embodiments of the present application can be applied is shown in the figure. Figure 3 As shown in the figure, the satellite mobile communication system includes two terminal devices (which can be referred to as terminals), two satellite base stations (such as Figure 3Two 5G base stations are shown, the 5G base stations are deployed on satellites, ground stations and 5G core networks. Among them, the satellite base station can communicate with the terminal device through the 5G new air interface. The two satellite base stations can communicate through the Xn interface. The satellite base station is connected with the ground station through the NG interface. The ground station is connected with the core network through the NG interface, which can be in wired or wireless form. When the NG interface is in wireless form, the satellite base station is connected with the ground core network through a wireless link. Satellites can usually form multiple beams, each beam is similar to a cell / sector in a ground mobile communication system (such as LTE / NR).

[0123] Terminal device: mobile device supporting 5G new air interface, typical mobile devices such as mobile phones, pads, etc. The terminal device can access the satellite network through the 5G new air interface and initiate calls, Internet services, etc.

[0124] 5G base station: mainly used for providing wireless access services, scheduling wireless resources for accessing terminal devices, providing reliable wireless transmission protocols and data encryption protocols, etc.

[0125] 5G core network: mainly used for providing user access control, mobility management, session management, user security authentication, charging, etc. The core network has multiple functional units, which can be divided into control plane functional units and user plane processing units. Among them, the control plane functional units (or network elements) include access and mobility management function (AMF) and session management function (SMF). AMF is used to manage user access, security authentication, and mobility management. SMF is used to manage the session of the terminal device (including the establishment, modification and release of the session), the selection and reselection of user plane functional elements, the allocation of internet protocol (IP) addresses of terminal devices, quality of service (QoS) control, the selection of UPF network elements providing message forwarding functions, etc. The user plane processing unit (or network element) includes a user plane function (UPF) unit, which is used to manage the transmission of user plane data, traffic statistics and other functions.

[0126] Ground station: mainly responsible for forwarding signaling and service data between satellite and base station, or satellite and core network.

[0127] 5G new air interface: represents the wireless link between the terminal device and the base station.

[0128] Xn interface: represents the interface between 5G satellite base stations, usually a wireless connection, mainly used to complete signaling interaction and user data transmission between 5G satellite base stations, such as signaling interaction such as switching satellites.

[0129] NG interface: refers to the interface between a 5G base station and the 5G core network, or the interface between a ground station and the core network, or the interface between a satellite base station and a ground station (in this case, the interface is a wireless link). It mainly interacts with the core network's non-access stratum (NAS) and other signaling, as well as user service data.

[0130] In the embodiments of the present application, the network devices in the terrestrial communication system and the satellites in the NTN communication system are uniformly regarded as network devices. The device used to implement the function of the network device can be a network device; it can also be a device that can support the network device to implement the function, such as a chip system, which can be installed in the network device. When describing the technical solutions provided by the embodiments of the present application below, the technical solutions provided by the embodiments of the present application are described by taking the device used to implement the function of the network device as a satellite as an example. It can be understood that when the method provided by the embodiments of the present application is applied to a terrestrial network communication system, the actions performed by the satellite can be applied to the base station or network device for execution.

[0131] To facilitate understanding of the embodiments of the present application, the application scenarios of the present application are introduced below. The application scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Ordinary technicians in this field can know that with the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0132] In satellite communication, a terminal device can access a satellite and receive services provided by the satellite. Since the satellite moves at a high speed in space, in a satellite communication scenario, the influence of the movement of the satellite on the terminal device needs to be considered, so as to perform mobility management on the terminal device. The mobility management of the terminal device includes reselection, handover and redirection, etc. The reselection of the terminal device refers to that, after the terminal device accesses the satellite, with the movement of the satellite or the increase of the load of the satellite, the signal quality of the downlink signal received by the terminal device becomes poor, the terminal device performs cell reselection, that is, the terminal device reselects a suitable cell to reside according to the signal quality. The handover of the terminal device refers to the process that the terminal device switches from a first satellite accessed by the terminal device to a second satellite. The redirection of the terminal device refers to that, when the terminal device needs to switch from a first satellite to a second satellite, if the current terminal device does not support handover (for example, due to the type of the terminal device, the second satellite cannot provide services for the terminal device), the first satellite sends a redirection message to the terminal device, and the redirection message includes related information of a third satellite, indicating that the terminal device is redirected to the third satellite.

[0133] In satellite communication, the satellite providing services is usually a satellite in a low earth orbit satellite system. The orbit height of the low earth orbit satellite system is about 500-1000 km, the coverage area of a single satellite on the ground is small, and the satellite moves at a high speed (about 25000 km / h) relative to the ground, and the average overhead time is about several minutes. Therefore, the cell coverage corresponding to a single satellite will change over time, which will cause frequent mobility management operations such as cell handover and tracking area update. In view of this, a staring mode of satellite communication is proposed. The staring mode refers to that, with the uninterrupted on-orbit movement of the satellite, the beam pointing of the satellite antenna is adjusted in time using staring beam forming technology, so that the antenna beam of the satellite can always point to a certain ground area (also called staring area), so as to prolong the communication time when the satellite is visible, concentrate power, reduce energy waste, improve the reliability and safety of satellite-ground communication, and avoid frequent mobility management operations including handover.

[0134] In a satellite system supporting the staring mode, since the satellite moves, the satellite beam providing services for the staring area needs to be changed when a certain condition is met, at this time all terminal devices in the staring area need to switch to a new satellite beam to continue communication. For example, please refer to Figure 4, assuming that the terminal devices in the gaze region are currently accessing the first satellite 410, but as the first satellite 410 moves, when the elevation angle of the antenna beam of the first satellite 410 with respect to the ground is less than a certain angle, or the relative position of the first satellite 410 with respect to the gaze region deviates from a certain range, or the time length for which the first satellite 410 provides services for the gaze region reaches a set time length (which can be pre-calculated according to the size of the gaze region and the moving speed of the first satellite 410), or the first satellite 410 meets other switching conditions, the first satellite 410 can trigger the terminal devices in the gaze region to initiate switching. At the time of switching, the first satellite 410 can predict the second satellite 420 that will cover the gaze region in the next time period according to the satellite ephemeris information (used to describe the moving law of the satellite in space), and can send a switching message to all terminal devices in the gaze region, instructing all terminal devices in the gaze region to switch to the second satellite 420.

[0135] However, based on the current switching mode, after all terminal devices in the gaze region receive the switching message, they will release the radio resource control (RRC) connection with the first satellite 410 and simultaneously initiate an RRC connection with the second satellite 420. Since the uplink transmission resources of the second satellite 420 are limited, and the uplink transmission resources initiated by the terminal devices for the RRC connection are randomly selected, simultaneous switching of all terminal devices in the gaze region to the second satellite 420 will cause a selection conflict of the uplink transmission resources, resulting in switching failure of some terminal devices and affecting the normal communication of the terminal devices.

[0136] Based on this, the embodiments of the present application provide a communication method for configuring auxiliary parameters for terminal devices when switching the terminal devices in a gaze beam scenario, so as to avoid switching failure caused by simultaneous switching of all terminal devices in the gaze region to the second satellite and improve the access problem of the terminal devices to the second satellite during batch switching.

[0137] The communication method proposed by the embodiments of the present application will be specifically described below in combination with specific drawings.

[0138] The following communication method is applicable to a terminal device, a first network device and a second network device. The first network device is a network device to which the terminal device is to be switched, such as a satellite (such as the second satellite 420 shown in FIG. 1) that will cover the location of the terminal device in the future. The terminal device will switch to this satellite. The second network device is a network device to which the terminal device is currently accessing, such as a satellite (such as the first satellite 410 shown in FIG. 1) that currently covers the location of the terminal device. Figure 4 Figure 4 The terminal device currently accesses this satellite.

[0139] Embodiment one​

[0140] Referring to Figure 5 A flowchart of a communication method according to an embodiment is shown in FIG. 5. The method can include the following steps.

[0141] Step 501: The terminal device receives first information, which includes uplink transmission authorization of a first network device corresponding to at least one terminal device group in a first area.

[0142] The first area is an area covered by the second network device, such as a gazing area of a satellite currently accessed by the terminal device.

[0143] Optionally, in the first information, the uplink transmission authorization of the first network device corresponding to one terminal device group can include one or more uplink transmission resources of the first network device, which can include time domain resources and / or frequency domain resources.

[0144] Optionally, the first information can also include space domain resources corresponding to the at least one terminal device group, which can also be referred to as beam pointing.

[0145] Optionally, in the first information, different terminal device groups can correspond to different uplink transmission authorizations and / or space domain resources. For example, different terminal device groups correspond to different uplink transmission authorizations but the same space domain resources, or correspond to different space domain resources but the same uplink transmission authorization, or correspond to different uplink transmission authorizations and different space domain resources. When corresponding to different uplink transmission authorizations, different terminal device groups can use different time periods and / or frequency bands to perform uplink transmission with the first network device, thereby solving the conflict of selecting time domain resources and / or frequency domain resources when a large number of terminal devices in the first area switch to the first network device. When corresponding to different space domain resources, different terminal device groups can use different pointing beams to perform uplink transmission with the first network device, whether the different terminal device groups correspond to the same uplink transmission authorization or different uplink transmission authorizations, and the resource conflict problem of batch switching can be solved by directional transmission.

[0146] Optionally, the first information can be sent by the first network device or the second network device to the terminal device, such as:

[0147] Example A, referring to Figure 6a , the first network device generates the first information according to the uplink transmission resources of the first network device (step 601a), and sends the first information to the terminal device (step 602a);

[0148] Example B, referring to Figure 6bThe first network device generates first information according to the uplink transmission resource of the first network device (step 601b), and sends the first information to the second network device (step 602b), and the second network device sends the first information to the terminal device (step 603b);

[0149] Example C, please refer to Figure 6c The first network device sends the uplink transmission resource of the first network device to the second network device (step 601c), the second network device generates first information according to the uplink transmission resource of the first network device (step 602c), and sends the first information to the terminal device (step 603c).

[0150] There can be other ways of generating and interacting with the first information. For example, in Example C above, the second network device can also send the first information to the first network device after generating the first information, and the first network device forwards it to the terminal device. This application does not enumerate them one by one.

[0151] For the convenience of introducing the scheme, the following takes Example A above as an example to introduce the specific configuration method of the first information. However, it should be understood that the related content is also applicable to Example B above, Example C above, or other examples not shown, and this application does not make specific limitations.

[0152] In a possible implementation, the first network device can pre-configure at least one uplink transmission grant for the first area according to the uplink transmission resource of the first network device, the at least one uplink transmission grant is associated with at least one terminal device group, and the at least one terminal device group can be divided based on at least one of the following parameters: terminal type, geographical location, service type, system bandwidth, number of antennas, power consumption level, duplex type, mobility, etc. For example, when dividing based on terminal type, vehicles, ships, mobile phones, etc. can be classified into different terminal device groups. For example, when dividing based on geographical location, the first area can be divided into multiple grids, each grid is associated with a terminal device group, and the terminal devices in each grid belong to the associated terminal device group. For example, when dividing based on power consumption level, terminal devices with ultra-high power consumption, high power consumption, and low power consumption can be classified into different terminal device groups.

[0153] In the above implementation, the at least one uplink transmission grant associated with the at least one terminal device group can mean that one uplink transmission grant is associated with only one terminal device group, or one uplink transmission grant is associated with multiple terminal device groups at the same time, or multiple uplink transmission grants are associated with one terminal device group at the same time. One uplink transmission grant can be shared by all terminal devices in the associated terminal device group. For example, when the associated terminal device group includes multiple terminal devices, the uplink transmission grant can be shared by multiple terminal devices.

[0154] Optionally, one uplink transmission grant is associated with one terminal device group, or is associated with multiple terminal device groups, which can be determined by the load condition of the first region. For example, in a possible implementation, after determining that the terminal devices in the first region are to be handed over to the first network device, the second network device can further send the load information of the first region to the first network device. According to the uplink transmission resources of the first network device and the load information of the first region, if it is determined that the uplink transmission resources of the first network device are relatively sufficient, the first network device can configure one uplink transmission grant for one terminal device group, and different terminal device groups correspond to different uplink transmission grants. If it is determined that the uplink transmission resources of the first network device are not sufficient, the first network device can configure one uplink transmission grant for multiple terminal device groups, and different terminal device groups can correspond to the same uplink transmission grant.

[0155] For example, it is assumed that the load information of the first region includes the number of terminal devices in the first region, which can include the following cases.

[0156] Case one, when the uplink transmission resources of the first network device are sufficient relative to the terminal devices in the first region, for example, there are 100 uplink transmission resources of the first network device, and there are only 10 terminal devices in the first region, the first network device can divide each terminal device in the first region into one terminal device group, and can configure one uplink transmission resource for each terminal device group, and different terminal device groups correspond to different uplink transmission resources. In this way, each terminal device can use its own specified uplink transmission resource to perform uplink transmission with the first network device, and there is no resource conflict problem between different terminal devices.

[0157] Case two, when the uplink transmission resources of the first network device are slightly insufficient relative to the terminal devices in the first region, the first network device can divide the terminal devices in the first region into multiple terminal device groups, and can configure one uplink transmission grant for each terminal device group, and one uplink transmission grant can include multiple uplink transmission resources. For example, there are 100 uplink transmission resources of the first network device, and there are 200 terminal devices in the first region, the first network device can divide the 200 terminal devices into 5 terminal device groups, each terminal device group includes 40 terminal devices (or different terminal device groups include different numbers of terminal devices), each terminal device group is configured with one uplink transmission grant, and one uplink transmission grant includes 20 uplink transmission resources (or different uplink transmission grants include different numbers of uplink transmission resources). In this way, the terminal devices in each terminal device group can use the uplink transmission resources in their own group to perform uplink transmission with the first network device, and there is no resource conflict problem between different terminal device groups.

[0158] Case three, when the uplink transmission resources of the first network device are severely insufficient relative to the terminal devices in the first region, the first network device can divide the terminal devices in the first region into a plurality of terminal device groups, and can configure the same uplink transmission grant for two or more terminal device groups. Optionally, the first network device can also configure different spatial domain resources for the terminal device groups multiplexing the same uplink transmission grant. For example, there are 100 uplink transmission resources of the first network device, and there are 10,000 terminal devices in the first region, then the first network device can divide the 10,000 terminal devices into 10 terminal device groups, and the 10 terminal device groups multiplex the same uplink transmission grant on different spatial domain resources, and the uplink transmission grant contains 100 uplink transmission resources. For example, the 10 terminal device groups can be divided based on geographical location, and the 10 terminal device groups use 100 uplink transmission resources to use beams corresponding to the direction of their own location to perform uplink transmission with the first network device, for example, the terminal device group uses 100 uplink transmission resources to use beams pointing east to perform uplink transmission with the first network device, the terminal device group 2 uses 100 uplink transmission resources to use beams pointing southeast to perform uplink transmission with the first network device,..., the terminal device group 10 uses 100 uplink transmission resources to use beams pointing west to perform uplink transmission with the first network device. In this way, different terminal device groups can use the same uplink transmission resources to perform uplink transmission with the first network device under different directional beams, and there is no resource conflict problem between different terminal device groups in the same time period.

[0159] It should be noted that the above is only an example of configuring uplink transmission grant based on load information. In actual communication methods, the uplink transmission grant can also be configured based on other information or rules, such as being indicated by a user, which is not limited in the present application.

[0160] It can be understood that after the first network device preconfigures at least one terminal device group and corresponding uplink transmission authorization for the first area, the first network device can generate the first information according to the preconfigured content, and can send the first information to the terminal device directly or indirectly through the second network device. For example, if the first network device has not completed uplink synchronization with the terminal device, the terminal device can not receive the information of the first network device because the terminal device has not switched to the target frequency point of the first network device. In this case, the first network device can send the first information to the second network device accessed by the terminal device, and the second network device can relay the first information to the terminal device. For another example, if the first network device has completed uplink synchronization with the terminal device, the terminal device has switched to the target frequency point of the first network device, and the terminal device can receive the information of the first network device at the target frequency point. In this case, the first network device can send the first information to the terminal device directly. In this way, whether the terminal device has completed uplink synchronization with the first network device or has not completed uplink synchronization, the terminal device can receive the first information, thereby providing support for the terminal device to access the first network device without resource conflict.

[0161] Step 502: The terminal device sends uplink data to the first network device according to the first information.

[0162] Correspondingly, the first network device receives the uplink data sent by the terminal device.

[0163] Here, the terminal device can be understood as a terminal device in the first area. That is to say, the terminal device belongs to at least one terminal device group.

[0164] Optionally, the uplink data can be used for the terminal device to access the first network device. For example, the uplink data can be a message sent in the third handshake (Msg3) of random access type 1 (or referred to as contention-based access method), and the uplink data includes a contention resolution identifier scrambled by a cell-radio network temporary identifier (C-RNTI) of the terminal device. The C-RNTI of the terminal device can be a cell identifier allocated by the first network device for the terminal device when the terminal device applies to access the first network device. For example, the first network device can indicate the C-RNTI of the terminal device to the terminal device in the random access response sent in the second handshake (Msg2) of the random access type 1.

[0165] Optionally, the terminal device can send uplink data to the first network device according to the first information when it is determined that the switching condition is met or triggered by the second network device. For example, the terminal device can determine the uplink transmission authorization corresponding to the terminal device according to the first information after it is determined that the relative position between the terminal device and the second network device exceeds a certain position deviation, or the relative position between the terminal device and the first network device is less than a preset position deviation, or the terminal device receives the switching message sent by the second network device, and then send uplink data to the first network device using the corresponding uplink transmission authorization to apply for access to the first network device.

[0166] Optionally, the terminal device can send uplink data to the first network device according to the first information after completing uplink synchronization with the first network device. For example, the terminal device can first perform uplink synchronization with the first network device after it is determined that the switching condition is met or triggered by the second network device (for details, see Embodiment II or Embodiment III below). After the uplink synchronization is completed, the terminal device can obtain the same uplink transmission parameters as the first network device. Then, the terminal device can send uplink data to the first network device using the corresponding uplink transmission authorization based on the same uplink transmission parameters, and the first network device can also receive the uplink data under the same uplink transmission parameters.

[0167] In a possible implementation, the terminal device sends uplink data to the first network device according to the first information, which can specifically be: the terminal device determines the first terminal device group to which the terminal device belongs from the at least one terminal device group according to the first information, and then sends uplink data to the first network device using the uplink transmission authorization corresponding to the first terminal device group.

[0168] The uplink transmission authorization corresponding to the first terminal device group can include one or more uplink transmission resources, and the terminal device can select the corresponding uplink transmission resource from the one or more uplink transmission resources according to a predefined rule and send uplink data to the first network device using the corresponding uplink transmission resource. There are many ways to select uplink transmission resources, such as:

[0169] If the first information corresponds to the first case in the above step 501, the uplink transmission authorization corresponding to the first terminal device group includes only one uplink transmission resource. In this case, the terminal device can directly use the only uplink transmission resource as the corresponding uplink transmission resource of the terminal device.

[0170] If the first information corresponds to the second case or the third case in the above step 501, the uplink transmission authorization corresponding to the first terminal device group can include multiple uplink transmission resources. In this case, the terminal device can select the first uplink transmission resource corresponding to the terminal device from the multiple uplink transmission resources according to the identifier of the terminal device.

[0171] For example, the identifier of the terminal device can be the C-RNTI of the terminal device. The terminal device can obtain the corresponding number of the terminal device by performing a modulo operation on the C-RNTI of the terminal device, and then select the uplink transmission resource corresponding to the number from the uplink transmission grant according to the corresponding number of the terminal device to perform uplink transmission. For example, in one example, the number of the terminal device can be obtained by performing a modulo operation according to the following formula:

[0172] Resource index = UE_Identity mod UL_Grant_pool_size

[0173] wherein Resource index is the number of the terminal device, UE_Identity is the identifier of the terminal device, such as the C-RNTI of the terminal device, and UL_Grant_pool_size is the total number of terminal devices included in the terminal device group to which the terminal device belongs.

[0174] According to the modulo operation in the above formula, each terminal device in a terminal device group has a different number, and thus the different uplink transmission resources in the uplink transmission grant corresponding to the terminal device group can be allocated to different terminal devices, which can avoid resource selection conflicts within the group.

[0175] According to the above embodiment one, the terminal device can select the uplink transmission resource for uplink transmission according to the predefined rule. For example, when the first region is a gazing region, the first network device is a satellite to be switched (also referred to as a new satellite), and the second network device is a currently accessed satellite, the terminal device in the gazing region can receive the first information before switching to the new satellite, and the first information includes the uplink transmission grant of the new satellite corresponding to at least one terminal device group in the gazing region. In this way, the terminal device in the gazing region can switch to the new satellite in groups according to the uplink transmission grant of the new satellite corresponding to each terminal device group without resource conflicts, thereby avoiding resource conflicts caused by random selection of uplink transmission resources when switching to the new satellite at the same time, and further avoiding the situation that the terminal device fails to switch, thereby ensuring normal communication of the terminal device.

[0176] The present application also provides a communication method for realizing uplink synchronization between a terminal device and a first network device. The specific implementation of the communication method will be described in detail below through embodiment two.

[0177] Embodiment two

[0178] Please refer to Figure 7, is a flow chart of a communication method provided in Implementation Plan 2, which may specifically include the following steps:

[0179] Step 701: The terminal device receives second information from a second network device.

[0180] Correspondingly, the second network device sends the second information to the terminal device.

[0181] The second information includes information related to the uplink synchronization interval (UL Sync Gap). For example, it includes first time information and second time information, the first time information covers at least one random access channel occasion (RO) of the first network device, and the second time information covers the random access response (RAR) window of the first network device, such as Figure 8 shown.

[0182] Optionally, the second information may be generated by the second network device or the first network device, for example:

[0183] In one example, the second network device may interact with the first network device in advance to obtain at least one RO and RAR window of the first network device, then configure first time information according to the at least one RO of the first network device, configure second time information according to the RAR window of the first network device, and then generate second information according to the first time information and the second time information, and send the second information to the terminal device;

[0184] In another example, the first network device configures first time information according to at least one RO of the first network device, configures second time information according to the RAR window of the first network device, generates second information according to the first time information and the second time information, and sends the second information to the second network device, and the second network device sends the second information to the terminal device;

[0185] In another example, the first network device configures first time information according to at least one RO of the first network device, configures second time information according to the RAR window of the first network device, and sends the first time information and the second time information to the second network device. The second network device generates second information based on the first time information and the second time information, and sends it to the terminal device.

[0186] And so on, there are many possible generation methods, which are not listed here one by one.

[0187] Step 702: The terminal device performs uplink synchronization with the first network device according to the second information.

[0188] Optionally, when the second information is generated by the second network device, the second network device can send the second information to the first network device in addition to sending the second information to the terminal device, so as to make the first network device also know the time configuration for uplink synchronization of the terminal device, and further make the first network device be able to respond to the uplink synchronization of the terminal device.

[0189] Optionally, the uplink synchronization can be implemented through different steps, or through different manners, or in different stages.

[0190] The specific manners of implementing the uplink synchronization in two different stages are exemplarily introduced below.

[0191] Uplink synchronization manner one

[0192] In the uplink synchronization manner one, the uplink synchronization can be implemented in a random access procedure. Please refer to Figure 9 , which can include the following steps:

[0193] In step 901, the terminal device sends a random access request to the first network device according to the first time information.

[0194] Correspondingly, the first network device receives the random access request sent by the terminal device.

[0195] Optionally, the random access request can be a message sent in the first handshaking (Msg1) of the random access type 1, and the random access request includes a preamble.

[0196] Optionally, when the first network device and the second network device are the same frequency, the terminal device can send the random access request to the first network device on the corresponding time domain resource according to the first time information. Since the first time information covers at least one RO of the first network device, the first network device can receive the random access request of the terminal device on the RO covered by the first time information.

[0197] Optionally, when the first network device and the second network device are different frequencies, please refer to Figure 10, the terminal device can receive fourth information sent by the second network device (step 1001) before sending the random access request to the first network device, and the fourth information includes the target frequency point of the first network device. The terminal device can switch its working frequency point (such as the transceiver frequency point) to the target frequency point of the first network device according to the fourth information within the time interval indicated by the first time information (step 1002), and then send the random access request to the first network device using the target frequency point. Since the first time information covers at least one RO of the first network device, the first network device can receive the random access request of the terminal device on the RO covered by the first time information. In this way, by configuring the first time information for the terminal device, the terminal device can obtain the uplink synchronization of the frequency switching network device to be switched.

[0198] Optionally, the terminal device can also send the location information of the terminal device when sending the random access request to the first network device. For example, please refer to Figure 11 When the terminal device sends the preamble (included in the random access request) to the first network device using the target frequency point of the first network device, the RO resource carrying the preamble corresponds to at least one uplink transmission resource, such as the physical uplink shared channel (PUSCH) shown in the figure, which is used for the terminal device to report the corresponding geographical position when sending the preamble. In this way, the random access request received by the first network device includes not only the preamble but also the geographical position of the terminal device, and the preamble can be used for the terminal device to access the first network device, and the geographical position of the terminal device can be used for grouping the terminal device, such as supporting the division of the terminal device group based on the geographical position of the terminal device in the first area in the above-mentioned embodiment one. Of course, the geographical position of the terminal device can also be used for other operations, such as determining the interference area, which is not limited here.

[0199] Step 902, the terminal device receives the random access response from the first network device according to the second time information.

[0200] Correspondingly, the first network device sends the random access response to the terminal device.

[0201] The random access response includes an uplink synchronization adjustment parameter, such as timing correction information.

[0202] Optionally, the second network device informs the first network device of the second information in advance. The first network device can parse the first time information and the second time information in the second information. The first network device can receive the random access request sent by the terminal device on the RO covered by the first time information, and can send the random access response to the terminal device on the RAR window covered by the second time information. Correspondingly, after the terminal device sends the random access request on the RO covered by the first time information, the terminal device can receive the random access response sent by the first network device on the RAR window covered by the second time information.

[0203] Optionally, when the first network device and the second network device are inter-frequency, the terminal device can switch its working frequency point to the target frequency point of the first network device within the time interval indicated by the second time information, and receive the random access response of the first network device using the target frequency point.

[0204] Step 903, the terminal device adjusts the uplink transmission parameter of the terminal device according to the random access response.

[0205] Optionally, the terminal device can adjust the uplink transmission parameter of the terminal device to be consistent with the first network device according to the uplink synchronization adjustment parameter contained in the random access response, so as to complete the uplink synchronization with the first network device.

[0206] Through the above uplink synchronization mode one, the terminal device can obtain the same uplink transmission parameter as the first network device through uplink synchronization before initially accessing the first network device, so as to provide parameter support for the uplink transmission of the terminal device to the first network device, such as accessing the first network device.

[0207] Uplink synchronization mode two

[0208] In the uplink synchronization mode two, the uplink synchronization can be implemented in the channel measurement process. Please refer to Figure 12 , which can include the following steps:

[0209] Step 1201, the terminal device sends a sounding reference signal (SRS) to the first network device according to the first time information.

[0210] Correspondingly, the first network device receives the SRS sent by the terminal device.

[0211] Optionally, the SRS can be a channel sounding message sent by the terminal device at a regular time after accessing the first network device, and the channel sounding message is used for the terminal device to send cell measurement and other auxiliary parameters to the first network device.

[0212] At step 1202, the terminal device receives the channel sounding response signal from the first network device according to the second time information.

[0213] Correspondingly, the first network device sends the channel sounding response signal to the terminal device.

[0214] The channel sounding response signal includes an uplink synchronization adjustment parameter, such as timing correction information.

[0215] Optionally, the first network device can receive the SRS sent by the terminal device on the RO covered by the first time information according to the second information, and after the channel measurement based on the SRS, the first network device can send the channel sounding response signal to the terminal device on the RAR window covered by the second time information. Correspondingly, the terminal device can receive the channel sounding response signal sent by the first network device on the RAR window covered by the second time information.

[0216] At step 1203, the terminal device adjusts the uplink transmission parameter of the terminal device according to the channel sounding response signal.

[0217] Optionally, the terminal device can adjust the uplink transmission parameter of the terminal device to be consistent with the first network device according to the uplink synchronization adjustment parameter contained in the channel sounding response signal, so as to complete the uplink synchronization with the first network device.

[0218] Through the above second uplink synchronization mode, the terminal device can perform timing maintenance of the uplink transmission parameter through the timing channel measurement process after accessing the first network device, and ensure the parameter consistency of the terminal device and the first network device in the RRC connected state.

[0219] It should be noted that the above content is only an example of two possible uplink synchronization modes, but it should be understood that in the actual communication process, the terminal device and the first network device can also implement uplink synchronization through other stages, or modes, or steps according to the first time information and the second time information, which is not limited in the present application.

[0220] By adopting the above second embodiment, the terminal device can be configured with the time information for uplink synchronization, so that the terminal device initiates uplink synchronization to the first network device based on the time information for uplink synchronization. Especially in the case of inter-frequency between the first network device and the second network device, the terminal device can initiate uplink synchronization to the first network device after switching to the target frequency point of the first network device according to the configured time information for uplink synchronization.

[0221] It can be understood that the second information in the above-mentioned embodiment two only takes the second information including both the first time information and the second time information as an example, but in other implementation manners, the second information can also include only one of the first time information and the second time information, for example, only the first time information or only the second time information, in which case, the other time information can be agreed in advance by the terminal device and the first network device, or can be indicated to the terminal device by the second network device or the first network device through other information, and the present application does not make a specific limitation here.

[0222] The present application also provides a communication method, which can also be used to realize the uplink synchronization between the terminal device and the first network device to be switched. The specific implementation of the communication method will be described in detail below through embodiment three.

[0223] Embodiment three

[0224] Please refer to Figure 13 A flowchart of a communication method provided for embodiment three is shown in the figure, and the method can specifically include the following steps:

[0225] Step 1301: The terminal device receives third information from the second network device.

[0226] Correspondingly, the second network device sends the third information to the terminal device.

[0227] Among them, the third information includes the uplink synchronization adjustment parameter of the first network device, such as timing correction information.

[0228] Optionally, the third information can be generated by the second network device or the first network device. For example, in one example, the second network device interacts with the first network device in advance to obtain the uplink synchronization adjustment parameter of the first network device, and generates the third information according to the uplink synchronization adjustment parameter of the first network device and sends it to the terminal device. For example, in another example, the first network device generates the third information according to its own uplink synchronization adjustment parameter, and sends the third information to the second network device, and the second network device forwards the third information to the terminal device. There are many possible generation methods, which are not listed here.

[0229] Step 1302: The terminal device adjusts the uplink transmission parameter of the terminal device according to the third information.

[0230] Optionally, the terminal device can adjust the uplink transmission parameter of the terminal device to be consistent with the first network device according to the uplink synchronization adjustment parameter of the first network device contained in the third information, so as to complete the uplink synchronization with the first network device.

[0231] With the above-mentioned implementation solution three, the terminal device can be directly indicated by the second network device currently accessed by the terminal device about the uplink synchronization adjustment parameter of the first network device to be switched, and thus the terminal device can directly complete the uplink synchronization with the first network device according to the indication of the second network device, and can no longer interact with the first network device about other information, thereby saving the communication overhead.

[0232] The present application also provides a communication method, which can be used for the terminal device to directly switch to the first network device under the indication of the second network device. The specific implementation of the communication method will be described in detail below through implementation solution four.

[0233] Implementation solution four

[0234] Please refer to Figure 14 A flowchart of a communication method provided for implementation solution four is shown in FIG. 14, and the method can specifically include the following steps:

[0235] Step 1401: The terminal device receives fourth information, and the fourth information includes the mapping relationship between the air interface resource of the first network device and the air interface resource of the second network device.

[0236] The air interface resource of the second network device includes the air interface resource allocated by the second network device for the first region. The first region is a region covered by the second network device, such as the gaze region of the satellite currently accessed by the terminal device. The terminal device is located in the first region.

[0237] Step 1402: The terminal device sends uplink data to the first network device according to the fourth information.

[0238] Optionally, before the first network device and the second network device perform the switching of the terminal device in the first region, the first network device and the second network device can also interact with each other about the resource scheduling situation on each beam, and / or wave position, and / or geographical region through the Xn interface. For example, the first network device can obtain the air interface resource scheduled by the second network device for the first region through the Xn interface, and can determine the air interface resource corresponding to the air interface resource after the mapping of the first network device, and then can allocate the mapped air interface resource to the first region, so that the first network device can continue to use the air interface resource allocation of the first region by the second network device when taking over the service of the first region provided by the second network device.

[0239] Optionally, after receiving the fourth information, the terminal device can parse the fourth information to obtain the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device. Since the second network device provides services for the first region, the air interface resources of the second network device include the air interface resources allocated by the second network device for the first region. The terminal device can query the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device according to the air interface resources allocated by the second network device for the first region, and determine the air interface resources allocated by the first network device for the first region. The air interface resources correspond to the air interface resources allocated by the first network device for the first region after the first network device takes over the services provided by the second network device for the first region. The terminal device in the first region can send uplink data to the first network device according to the air interface resources, so as to continue communication with the first network device after the first network device takes over the services provided by the second network device for the first region.

[0240] In a possible implementation, the fourth information can be sent by the first network device or the second network device to the terminal device.

[0241] For example, taking that the second network device sends the fourth information as an example, refer to Figure 15 , which can include the following steps:

[0242] Step 1501: The second network device receives eighth information from the first network device.

[0243] Correspondingly, the first network device sends the eighth information to the second network device.

[0244] The eighth information is used to indicate the air interface resources of the first network device.

[0245] Optionally, before the terminal device in the first region switches to the first network device, the second network device can also interact with the first network device through the Xn interface to instruct the first network device to send the eighth information, and the eighth information is used to indicate the resource scheduling situation of the first network device for each beam, and / or wave position, and / or geographical region. For example, the eighth information can include at least one of the cell-level parameters, beam-level parameters, user-level parameters or other level parameters of the first network device. The cell-level parameters may, for example, include the bearer configuration parameters of the system message. The beam-level parameters may, for example, include the bearer configuration parameters of the physical resource pool. The user-level parameters may, for example, include the bearer configuration parameters of the control plane and user plane of a single terminal device.

[0246] Step 1502: The second network device establishes the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device according to the eighth information and the air interface resources of the second network device.

[0247] Optionally, the second network device can establish a mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device according to the air interface resources of the second network device and the air interface resources of the first network device indicated by the eighth information.

[0248] For example, the second network device can establish a mapping relationship between the physical resource blocks of the first network device and the physical resource blocks of the second network device according to the scheduling of the physical resource blocks in the physical resource pool of the first network device and the scheduling of the physical resource blocks in the physical resource pool of the second network device, if it is determined that the physical resource pool of the first network device and the physical resource pool of the second network device do not match according to the air interface resources of the second network device and the air interface resources of the first network device indicated by the eighth information. The mapping relationship can be in the form of a data table, a database, a graph, a formula or any other form. For example, the mapping relationship can be an interleaving table as shown in Figure 16

[0249] At step 1503, the second network device sends fourth information to the terminal device, and the fourth information includes the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device.

[0250] Optionally, the second network device can send the fourth information to the terminal device through unicast or broadcast signaling.

[0251] Optionally, after sending the fourth information, the second network device can further send a handover message to the terminal device in the first area, and the handover message is used to instruct the terminal device in the first area to hand over to the first network device.

[0252] By using the above steps, the terminal device can obtain the mapping relationship between the air interface resources of the second network device currently accessed and the air interface resources of the first network device to be handed over by communicating with the second network device currently accessed before handover to the first network device.

[0253] For another example, taking the first network device sending the fourth information as an example, please refer to Figure 17 , which can include the following steps:

[0254] At step 1701, the first network device receives seventh information from the second network device.

[0255] Correspondingly, the second network device sends the seventh information to the first network device.

[0256] The seventh information is used to indicate the air interface resources of the second network device.

[0257] ​Optionally, before the terminal device in the first area switches to the first network device, the second network device can also send seventh information to the first network device through the Xn interface, and the seventh information is used to indicate the resource scheduling situation of the second network device for each beam, and / or wave position, and / or geographical area. For example, the seventh information is used to indicate at least the resource scheduling situation of the second network device for each beam, and / or wave position, and / or geographical area in the first area. For example, the seventh information can include at least one of the cell-level parameter, the beam-level parameter, the user-level parameter, or other level parameters of the first network device scheduling in the first area.

[0258] Step 1702: The first network device establishes a mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device according to the seventh information and the air interface resources of the first network device.

[0259] Step 1703: The first network device sends fourth information to the terminal device, and the fourth information includes the mapping relationship between the air interface resources of the first network device and the air interface resources of the second network device.

[0260] Optionally, the first network device can send the fourth information to the terminal device through a unicast or broadcast message.

[0261] By using the above steps, before the terminal device switches to the first network device, the terminal device can obtain the mapping relationship between the air interface resources of the second network device currently accessed and the first network device to be switched by communicating with the first network device to be switched.

[0262] It can be understood that there can be other interaction modes of the fourth information, such as in another possible scheme, the first network device can generate the mapping relationship and send it to the second network device, and the second network device sends it to the terminal device. Or, in another possible scheme, the second network device can generate the mapping relationship and send it to the first network device, and the first network device sends it to the terminal device. And so on. There are many possible implementation manners, which are not listed one by one here.

[0263] In a possible implementation, when the service period of the first network device for the first area is discontinuous, the first network device can further send fifth information to the terminal device, where the fifth information is used to indicate the service period of the first network device for the first area. The terminal device can send uplink data to the first network device in the service period of the first network device according to the fifth information. For example, after the first network device takes over the service for the first area from the second network device, if it is determined that there is a discontinuous gaze of the taking-over beam, the first network device can further send discontinuous coverage information of the taking-over beam to the terminal device in the first area through unicast or broadcast signaling. In this way, the terminal device in the first area can communicate with the first network device in the period with beam coverage according to the discontinuous coverage information of the taking-over beam, and can not communicate with the first network device in the period without beam coverage, thereby unnecessary communication overhead can be saved.

[0264] In a possible implementation, the first network device can further send sixth information to the terminal device, where the sixth information is used to indicate a power adjustment parameter. The terminal device can send uplink data to the first network device using a target power indicated by the power adjustment parameter according to the sixth information. For example, after the first network device takes over the service for the first area from the second network device, if it is determined that the distance between the first network device and the terminal device is different from the distance between the second network device and the terminal device, the first network device can indicate the power adjustment amount (P_offset) that needs to be performed after accessing the taking-over beam to the terminal device through unicast or broadcast signaling, where the power adjustment amount is associated with the difference between the distance from the terminal device to the second network device and the distance from the terminal device to the first network device. For example, it is assumed that the satellite orbit of the second network device is only 10,000 kilometers away from the ground, and the satellite orbit of the first network device is 20,000 kilometers away from the ground. In order for the terminal device on the ground to switch from the second network device to the first network device, the transmission power of the terminal device needs to be adjusted, that is, the power adjustment amount is used to increase the transmission power of the terminal device, so that the terminal device can use larger transmission power to transmit information to the first network device that is farther away.

[0265] It can be understood that when the fourth information is sent by the first network device, the fourth information, the fifth information, and the sixth information can be the same information, or can be different information, or two of them are the same information and the other is different information. For example, in an example, the first network device sends the fourth information to the terminal device, the fourth information carries the mapping relationship between the air interface resource of the first network device and the air interface resource of the second network device, and the service period of the first network device for the first region. According to the fourth information, the terminal device can send uplink data to the first network device using the air interface resource allocated by the first network device for the first region within the service period of the first network device. For another example, in another example, the first network device sends the fourth information to the terminal device, the fourth information carries the mapping relationship between the air interface resource of the first network device and the air interface resource of the second network device, the power adjustment parameter, and the service period of the first network device for the first region. According to the fourth information, the terminal device can send uplink data to the first network device using the air interface resource allocated by the first network device for the first region with the target power within the service period of the first network device. For another example, in another example, the first network device first sends the fourth information to the terminal device, and then sends the fifth information to the terminal device. The fourth information carries the mapping relationship between the air interface resource of the first network device and the air interface resource of the second network device. The fifth information carries the power adjustment parameter and the service period of the first network device for the first region. According to the fourth information and the fifth information, the terminal device can send uplink data to the first network device using the air interface resource allocated by the first network device for the first region with the target power within the service period of the first network device. There are many possible implementation manners, which will not be listed one by one here.

[0266] By indicating the resource mapping relationship of the beams before and after the switching to the terminal device by adopting the above-mentioned implementation scheme four, the terminal device can learn the air interface resource allocation in the next stage according to the resource mapping relationship, that is, the air interface resource allocated by the first network device for the first region after the switching. In this way, when the terminal device needs to disconnect the connection with the second network device, the terminal device can directly use the air interface resource allocated by the first network device for the first region to continue the communication with the first network device, so as to switch from the second network device to the first network device without awareness. In this way, not only can the switching failure caused by the request of multiple terminal devices to the first network device for uplink transmission resources be avoided, but also the signaling overhead of the re-scheduling can be avoided.

[0267] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0268] For example, in one combination, implementation 5 can be obtained by combining implementation 1 and implementation 2, and implementation 5 can include the following steps: before the terminal device in the first area switches to the first network device, the second network device can send second information to the terminal device in the first area, and the second information includes first time information and second time information; the terminal device performs uplink synchronization with the first network device according to the first time information and the second time information; the first network device sends first information to the terminal device, and the first information includes uplink transmission authorization of at least one terminal device group in the first area; after the terminal device completes uplink synchronization with the first network device, the terminal device sends uplink data to the first network device according to the first information to apply for access to the first network device.

[0269] For example, in another combination, implementation 6 can be obtained by combining implementation 1 and implementation 3, and implementation 6 can include the following steps: before the terminal device in the first area switches to the first network device, the second network device can send third information to the terminal device in the first area, and the third information includes uplink synchronization adjustment parameters of the first network device; the terminal device performs uplink synchronization with the first network device according to the third information; the first network device sends first information to the terminal device, and the first information includes uplink transmission authorization of at least one terminal device group in the first area; after the terminal device completes uplink synchronization with the first network device, the terminal device sends uplink data to the first network device according to the first information using the uplink transmission authorization of the terminal device group to which the terminal device belongs, to apply for access to the first network device.

[0270] For example, in another combination, implementation 6 can be obtained by combining implementation 1 and implementation 3, and implementation 6 can include the following steps: before the terminal device in the first area switches to the first network device, the second network device can send third information to the terminal device in the first area, and the third information includes uplink synchronization adjustment parameters of the first network device; the terminal device performs uplink synchronization with the first network device according to the third information; the first network device sends first information to the terminal device, and the first information includes uplink transmission authorization of at least one terminal device group in the first area; after the terminal device completes uplink synchronization with the first network device, the terminal device sends uplink data to the first network device according to the first information using the uplink transmission authorization of the terminal device group to which the terminal device belongs, to apply for access to the first network device.

[0271] For example, in another combination method, the above-mentioned implementation plan 2 and implementation plan 3 can be combined to obtain implementation plan 8, and implementation plan 8 may include the following steps: the second network device sends third information to the terminal device in the first area, and the third information includes the uplink synchronization adjustment parameter of the first network device; the terminal device performs uplink synchronization with the first network device based on the third information; the second network device sends second information to the terminal device in the first area, and the second information includes first time information and second time information; the terminal device exchanges random access requests and random access responses with the first network device based on the first time information and the second time information, but the random access response may not include the uplink synchronization adjustment parameter, but is only used to complete the random access process.

[0272] For example, in another combination, the above-mentioned Implementation Option 2 and Implementation Option 3 can be combined to obtain Implementation Option 9, which may include the following steps: the second network device sends a third message to the terminal device in the first area, and the third message includes the uplink synchronization adjustment parameters of the first network device; the terminal device performs uplink synchronization with the first network device based on the third message; the second network device sends a second message to the terminal device in the first area, and the second message includes the first time information and the second time information; the terminal device exchanges a channel detection reference signal and a channel detection response signal with the first network device based on the first time information and the second time information, and the channel detection response signal includes the uplink synchronization adjustment parameters. This solution can instruct the terminal device to perform uplink synchronization with the first network device through the second network device before switching, and after switching, the uplink transmission parameters can be regularly maintained through the cell measurement process of the first network device.

[0273] There are many possible combinations, and this application will not list them one by one.

[0274] Based on the communication method described above, the present application can also provide a communication device, which can be used to execute the above communication method. The relevant features can be found in the above method embodiment and will not be repeated here.

[0275] In one possible implementation, see Figure 18, shows a possible structural schematic diagram of a communication apparatus. The communication apparatus 1800 can include a processing unit 1810 and a communication unit 1820. The communication apparatus 1800 can be a terminal device, or can be applied to or matched with the terminal device, and can implement the communication method performed by the terminal device; or the communication apparatus 1800 can be a first network device, or can be applied to or matched with the first network device, and can implement the communication method performed by the first network device; or the communication apparatus 1800 can be a second network device, or can be applied to or matched with the second network device, and can implement the communication method performed by the second network device.

[0276] The communication unit 1820 can also be referred to as a transceiving unit, a transceiver, a transceiver, or a transceiving apparatus, etc. The processing unit 1810 can also be referred to as a processor, a processing board, a processing unit, or a processing apparatus, etc. Optionally, the communication unit 1820 is configured to perform the transmitting operation and the receiving operation of the terminal device, or the first network device, or the second network device in the above method, and the device in the communication unit 1820 for implementing the receiving function can be regarded as a receiving unit, and the device in the communication unit 1820 for implementing the transmitting function can be regarded as a transmitting unit, that is, the communication unit 1820 includes the receiving unit and the transmitting unit.

[0277] When the communication apparatus 1800 is applied to the terminal device, the processing unit 1810 can be configured to implement the processing function of the terminal device in the embodiments shown in Figure 5 、 Figure 6a 、 Figure 6b 、 Figure 6c 、 Figure 7 、 Figure 9 、 Figure 10 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 or Figure 17 , and the communication unit 1820 can be configured to implement the transceiving function of the terminal device in the embodiments shown in Figure 5 、 Figure 6a 、 Figure 6b 、 Figure 6c 、 Figure 7 、 Figure 9 、 Figure 10 、 Figure 12 、 Figure 14 、 Figure 15 、 Figure 17 or Figure 5 . For example, when the communication apparatus 1800 performs the communication method as described above Figure 7In the communication method shown in the embodiment, the communication unit 1820 receives first information, and the processing unit 1810 controls the communication unit 1820 to send uplink data to the first network device according to the first information. The first information includes uplink transmission authorization of the first network device corresponding to at least one terminal device group in a first region, the first region is a region covered by a second network device, the second network device is a network device accessed by the terminal device, and the first network device is a network device to be switched by the terminal device. For example, when the communication apparatus 1800 performs the above Figure 14 In the communication method shown in the embodiment, the communication unit 1820 receives second information from the second network device, and the processing unit 1810 performs uplink synchronization with the first network device according to the second information. The second information includes first time information and second time information, the first time information covers at least one random access occasion of the first network device, and the second time information covers a random access response window of the first network device. For example, when the communication apparatus 1800 performs the above Figure 6b In the communication method shown in the embodiment, the communication unit 1820 receives fourth information, and the processing unit 1810 controls the communication unit 1820 to send uplink data to the first network device according to the fourth information. The fourth information includes a mapping relationship between air interface resources of the first network device and air interface resources of the second network device, and the air interface resources of the second network device include air interface resources allocated by the second network device for the first region, the first region is a region covered by the second network device, the second network device is a network device accessed by the terminal device, and the first network device is a network device to be switched by the terminal device.

[0278] When the communication apparatus 1800 is applied to the first network device, the processing unit 1810 can be used to implement the processing functions of the first network device in the embodiments shown in Figure 6c 、 Figure 7 、 Figure 10 、 Figure 13 、 Figure 15 、 Figure 17 、 Figure 6b 、 Figure 6c 、 Figure 7 、 Figure 10 、 Figure 13 The communication unit 1820 can be used to implement the transceiver functions of the first network device in the embodiments shown in Figure 15 、 Figure 17 、 Figure 7 、 Figure 19 、 Figure 19 、 Figure 19 、 Figure 1 、 Figure 1 、 Figure 1 、 Figure 1 、 Figure 1 For example, when the communication apparatus 1800 performs the above Figure 1When using the communication method shown in FIG. 1 , the processing unit 1810 controls the communication unit 1820 to send the first information and controls the communication unit 1820 to receive the uplink data sent by the terminal device. The first information includes an uplink transmission authorization of the first network device corresponding to at least one terminal device group in the first area, the first area is the area covered by the second network device, the second network device is the network device to which the terminal device accesses, and the first network device is the network device to be switched by the terminal device. For example, when the communication device 1800 executes the above ​ When the communication method shown in FIG. 1 is used, the communication unit 1820 receives the second information from the second network device, and the processing unit 1810 controls the communication unit 1820 to perform uplink synchronization with the terminal device according to the second information. The second information includes first time information and second time information, the first time information covers at least one random access opportunity of the first network device, and the second time information covers the random access response window of the first network device. For example, when the communication device 1800 performs the above ​ In the communication method shown, the communication unit 1820 receives the seventh information from the second network device, and the processing unit 1810 controls the communication unit 1820 to receive the uplink data sent by the terminal device according to the seventh information, wherein the seventh information is used to indicate the air interface resources allocated by the second network device to the first area, the second network device is the network device accessed by the terminal device, and the first network device is the network device to be switched by the terminal device.

[0279] When the communication device 1800 is applied to the second network device, the processing unit 1810 can be used to implement ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ In the embodiment shown, the communication unit 1820 can be used to implement the processing function of the second network device. ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ The second network device in the embodiment shown has a transceiver function. For example, when the communication device 1800 executes the above ​ In the communication method shown, processing unit 1810 controls communication unit 1820 to send second information to the terminal device and the first network device. The second information includes first time information and second time information, the first time information covers at least one random access opportunity of the first network device, the second time information covers the random access response window of the first network device, and the second information is used for uplink synchronization between the terminal device and the first network device.

[0280] It should be noted that the communication unit 1820 and / or the processing unit 1810 can be implemented by virtual modules. For example, the processing unit 1810 can be implemented by a software function unit or a virtual device, and the communication unit 1820 can be implemented by a software function or a virtual device. Alternatively, the processing unit 1810 or the communication unit 1820 can also be implemented by an entity device. For example, if the communication device is implemented by a chip / chip circuit, the communication unit 1820 can be an input / output circuit and / or a communication interface, which performs an input operation (corresponding to the aforementioned receiving operation) and an output operation (corresponding to the aforementioned sending operation); and the processing unit 1810 is an integrated processor or a microprocessor or an integrated circuit.

[0281] The division of units in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, another division manner can be used. In addition, each function unit in each embodiment of the present application can be integrated in one processor, or can be a separate physical unit, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software function module.

[0282] In another possible implementation manner, refer to ​ , which shows another possible structural schematic diagram of a communication device. For example, the communication device 1900 can be a chip or a chip system. Optionally, in the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0283] The communication device 1900 can be used to implement the functions of the terminal device, or the first network device, or the second network device described in the foregoing embodiments. The communication device 1900 can include at least one processor 1910 coupled with a memory. Optionally, the memory can be located in the communication device 1900, and can be integrated with the processor, or can be located outside the communication device 1900. For example, the communication device 1900 can further include at least one memory 1920. The memory 1920 stores computer programs (or instructions) and / or data necessary for implementing any of the foregoing embodiments. The processor 1910 can execute the computer programs (or instructions) and / or data stored in the memory 1920 to complete the method in any of the foregoing embodiments.

[0284] The communication device 1900 can further include a communication interface 1930, through which the communication device 1900 can interact with other devices. For example, the communication interface 1930 can be a transceiver, a circuit, a bus, a module, a pin, or another type of communication interface. When the communication device 1900 is a chip or a circuit, the communication interface 1930 in the communication device 1900 can also be an input / output circuit that can input (or receive) information and output (or send) information. The processor can be an integrated processor or a microprocessor or an integrated circuit or a logic circuit. The processor can determine output information according to input information.

[0285] The coupling in the embodiments of the present application is indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. The processor 1910 can operate in cooperation with the memory 1920 and the communication interface 1930. The specific connection medium between the processor 1910, the memory 1920 and the communication interface 1930 is not limited in the embodiments of the present application.

[0286] Optionally, referring to ​ The processor 1910, the memory 1920 and the communication interface 1930 are connected to each other through a bus. The bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, ​ In the embodiments of the present application, only one thick line is used to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0287] In the embodiments of the present application, the processor 1910 can be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general-purpose processor can be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as execution completed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0288] In the embodiments of the present application, the memory 1920 can be a non-volatile memory such as a hard disk drive (HDD) or a solid-state drive (SSD), and can also be a volatile memory such as a random-access memory (RAM). The memory 1920 can be any other medium capable of carrying or storing desired program codes in the form of instructions or data structures and capable of being accessed by a computer, but is not limited to this. The memory 1920 in the embodiments of the present application can also be a circuit or any other device capable of realizing a storage function, used for storing program instructions and / or data.

[0289] The communication device 1900 can be applied to a terminal device, and specifically can be a terminal device or a device capable of supporting the terminal device to realize the functions of the terminal device in any of the above-mentioned embodiments. The memory 1920 stores computer programs (or instructions) and / or data for realizing the functions of the terminal device in any of the above-mentioned embodiments. The processor 1910 can execute the computer programs stored in the memory 1920 to complete the methods performed by the terminal device in any of the above-mentioned embodiments. When applied to a terminal device, the communication interface 1930 in the communication device 1900 can be used to interact with other communication devices (such as a first network device and a second network device), send information to other communication devices or receive information from other communication devices.

[0290] The communication device 1900 can be applied to a first network device, and specifically can be a first network device or a device capable of supporting the first network device to realize the functions of the first network device in any of the above-mentioned embodiments. The memory 1920 stores computer programs (or instructions) and / or data for realizing the functions of the first network device in any of the above-mentioned embodiments. The processor 1910 can execute the computer programs stored in the memory 1920 to complete the methods performed by the first network device in any of the above-mentioned embodiments. When applied to a first network device, the communication interface 1930 in the communication device 1900 can be used to interact with other communication devices (such as a terminal device and a second network device), send information to other communication devices or receive information from other communication devices.

[0291] The communication device 1900 can be applied to the second network device, and specifically, the communication device 1900 can be the second network device, or can be a device capable of supporting the first network device to implement the functions of the second network device in any of the above-mentioned embodiments. The memory 1920 stores computer programs (or instructions) and / or data for implementing the functions of the second network device in any of the above-mentioned embodiments. The processor 1910 can execute the computer programs stored in the memory 1920 to complete the method performed by the second network device in any of the above-mentioned embodiments. When applied to the second network device, the communication interface 1930 in the communication device 1900 can be used to interact with other communication devices (such as terminal devices, first network devices), send information to other communication devices or receive information from other communication devices.

[0292] Based on the above, the present application further provides a communication system, which includes the terminal device, the first network device and the second network device mentioned in any of the above-mentioned method embodiments, and can be used to perform the method performed by each device in any of the above-mentioned method embodiments.

[0293] Based on the above, the present application further provides a computer readable storage medium, which stores instructions, and when the instructions are executed, the method performed by each device in any of the above-mentioned method embodiments is implemented. The computer readable storage medium can include a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various media that can store program codes.

[0294] Based on the above, the present application further provides a computer program product, which includes a computer program (also referred to as code or instructions), and when the computer program runs on a computer, the computer executes the method performed by each device in any of the above-mentioned method embodiments. Optionally, the computer can be a communication device such as a terminal device, a first network device or a second network device.

[0295] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0296] In the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0297] It can be understood that various numbers (such as the number "first", "second", and the like, such as the letter number "example A", "example B", "example C", and the like) involved in the embodiments of the present application are only for differentiation for the convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic.

[0298] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk memory, compact disc read-only memory (CD-ROM), optical memory, etc.) containing computer usable program code.

[0299] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the functions specified in the flowcharts and / or block diagrams. ​ The functions specified in one flow or multiple flows and / or blocks ​ The device that realizes the functions specified in one flow or multiple flows and / or blocks.

[0300] These computer program instructions can also be stored in a computer readable memory that can guide the computer or other programmable data processing apparatus to work in a specific way, so that the instructions stored in the computer readable memory produce a product including instruction devices, which realize the functions specified in the flowcharts and / or block diagrams. ​ The functions specified in one flow or multiple flows and / or blocks​ the function(s) specified in the block or blocks.

[0301] These computer program instructions can also be loaded into computer or other programmable data processing devices, so that a series of operation steps are ​ flowchart or flowchart(s) and / or block(s) of the application. ​ the function(s) specified in the block or blocks.

Claims

1. A communication method characterized by comprising: The application is applied to a terminal device, comprising: receiving first information, wherein the first information comprises uplink transmission authorization of a first network device corresponding to at least one terminal device group in a first area, the first area is an area covered by a second network device, the second network device is a network device accessed by the terminal device, the first network device is a network device to be switched by the terminal device, and the terminal device belongs to the at least one terminal device group; sending uplink data to the first network device according to the first information.

2. The method of claim 1, wherein, The uplink data is used for the terminal device to access the first network device.

3. The method of claim 1 or 2, wherein, Different terminal device groups correspond to different uplink transmission authorizations or space resources.

4. The method of any one of claims 1 to 3, wherein, The step of sending uplink data to the first network device according to the first information comprises: sending the uplink data to the first network device according to uplink transmission authorization corresponding to a first terminal device group to which the terminal device belongs, wherein the first terminal device group is one of the at least one terminal device group.

5. The method of claim 4, wherein, The uplink transmission authorization corresponding to the first terminal device group comprises at least one uplink transmission resource. The step of sending the uplink data to the first network device according to uplink transmission authorization corresponding to the first terminal device group to which the terminal device belongs comprises: determining a first uplink transmission resource corresponding to the terminal device from the at least one uplink transmission resource according to an identifier of the terminal device, and sending the uplink data to the first network device using the first uplink transmission resource.

6. The method of claim 5, wherein, The identifier of the terminal device is a cell radio network temporary identifier (C-RNTI) of the terminal device.

7. The method of any one of claims 1 to 6, wherein, The method further comprises: receiving second information from the second network device, wherein the second information comprises first time information and second time information, the first time information covers at least one random access occasion of the first network device, and the second time information covers a random access response window of the first network device; performing uplink synchronization with the first network device according to the first time information and the second time information.

8. The method of claim 7, wherein, The step of performing uplink synchronization with the first network device according to the first time information and the second time information comprises: sending a random access request to the first network device according to the first time information; receiving a random access response from the first network device according to the second time information, wherein the random access response comprises an uplink synchronization adjustment parameter; adjusting an uplink transmission parameter of the terminal device according to the uplink synchronization adjustment parameter.

9. The method of claim 7 or 8, wherein, The step of performing uplink synchronization with the first network device according to the first time information and the second time information comprises: sending a channel sounding reference signal to the first network device according to the first time information; receiving a channel sounding response signal from the first network device according to the second time information, wherein the channel sounding response signal comprises an uplink synchronization adjustment parameter; adjusting an uplink transmission parameter of the terminal device according to the uplink synchronization adjustment parameter.

10. The method of any one of claims 1 to 9, wherein, The method further comprises: receiving third information from the second network device, the third information comprising uplink synchronization adjustment parameters of the first network device; adjusting uplink transmission parameters of the terminal device according to the uplink synchronization adjustment parameters.

11. The method of any one of claims 1 to 10, wherein, The method further comprises: receiving fourth information from the second network device, the fourth information indicating a target frequency point of the first network device; switching a working frequency point of the terminal device to the target frequency point according to the fourth information.

12. A communication method characterized by comprising: Applied to a first network device, comprising: sending first information, the first information comprising uplink transmission authorization of the first network device corresponding to at least one terminal device group in a first area, the first area being an area covered by a second network device, the second network device being a network device accessed by a terminal device, the first network device being a network device to be switched by the terminal device, the terminal device belonging to the at least one terminal device group; receiving uplink data sent by the terminal device.

13. The method of claim 12, wherein, The method further comprises: receiving second information from the second network device, the second information comprising first time information and second time information, the first time information covering at least one random access occasion of the first network device, and the second time information covering a random access response window of the first network device; performing uplink synchronization with the terminal device according to the first time information and the second time information.

14. The method of claim 13, wherein, The performing uplink synchronization with the terminal device according to the first time information and the second time information comprises: receiving a random access request sent by the terminal device according to the first time information; sending a random access response to the terminal device according to the second time information, the random access response comprising uplink synchronization adjustment parameters, the uplink synchronization adjustment parameters being used by the terminal device to adjust uplink transmission parameters.

15. The method of claim 13, wherein, The performing uplink synchronization with the terminal device according to the first time information and the second time information comprises: receiving a channel sounding reference signal sent by the terminal device according to the first time information; sending a channel sounding response signal to the terminal device according to the second time information, the channel sounding response signal comprising uplink synchronization adjustment parameters, the uplink synchronization adjustment parameters being used by the terminal device to adjust uplink transmission parameters.

16. A method of communication, comprising: Applied to a second network device, comprising: sending second information to a terminal device or a first network device, the second information comprising first time information and second time information, the first time information covering at least one random access occasion of the first network device, and the second time information covering a random access response window of the first network device, the second information being used by the terminal device and the first network device to perform uplink synchronization.

17. A method of communication, comprising: Applied to a terminal device, comprising: receiving fourth information, the fourth information comprising a mapping relationship between air interface resources of a first network device and air interface resources of a second network device, the air interface resources of the second network device comprising air interface resources allocated by the second network device for a first region, the first region being a region covered by the second network device, the second network device being a network device accessed by the terminal device, the first network device being a network device to be switched by the terminal device, the terminal device being located in the first region; sending uplink data to the first network device according to the fourth information.

18. The method of claim 17, wherein, The method further comprises: receiving fifth information from the first network device, the fifth information being used to indicate a service period of the first network device for the first region; 19. The method of claim 17 or 18, wherein, sending the uplink data to the first network device in the service period of the first network device according to the fifth information. The method further comprises: receiving sixth information from the first network device, the sixth information being used to indicate a power adjustment parameter; 20. The method of any one of claims 17 to 19, wherein, sending the uplink data to the first network device using a target power according to the power adjustment parameter. The method is applied to a first network device, and comprises: receiving seventh information from a second network device, the seventh information being used to indicate air interface resources allocated by the second network device for a first region, the first region being a region covered by the second network device, the second network device being a network device accessed by a terminal device, the first network device being a network device to be switched by the terminal device, the terminal device being located in the first region; 21. A method of communication, comprising: receiving uplink data sent by the terminal device according to the seventh information. The method further comprises: receiving the uplink data sent by the terminal device according to air interface resources allocated by the first network device for the first region, the air interface resources allocated by the first network device for the first region being obtained according to the mapping relationship and the air interface resources allocated by the second network device for the first region.

22. The method of claim 21, wherein, The method is applied to a second network device, and comprises: sending fourth information to a terminal device, the fourth information comprising a mapping relationship between air interface resources of a first network device and air interface resources of the second network device, the air interface resources of the second network device comprising air interface resources allocated by the second network device for a first region, the first region being a region covered by the second network device, the second network device being a network device accessed by the terminal device, the first network device being a network device to be switched by the terminal device, the terminal device being located in the first region; 23. A method of communication, comprising: ​ ​ The first network device is sent seventh information, and the seventh information is used for indicating that the second network device allocates the air interface resource for the first area.

24. A communications device, characterized by comprises a module for executing the method of any one of claims 1-11, or a module for executing the method of any one of claims 12-15, or a module for executing the method of claim 16, or a module for executing the method of any one of claims 17-20, or a module for executing the method of claim 21 or 22, or a module for executing the method of claim 23.

25. A communications device, characterized by comprises: a processor coupled to the memory, the memory being configured to store a computer program or instructions, and the processor being configured to execute the computer program or instructions to implement the method of any one of claims 1-11, or the method of any one of claims 12-15, or the method of claim 16, or the method of any one of claims 17-20, or the method of claim 21 or 22, or the method of claim 23.

26. A communications device, characterized by comprises an interface circuit and a logic circuit; the interface circuit is configured to communicate with a module outside the communication device; the logic circuit is configured to execute a computer program to cause the communication device to execute the method of any one of claims 1-11, or the method of any one of claims 12-15, or the method of claim 16, or the method of any one of claims 17-20, or the method of claim 21 or 22, or the method of claim 23.

27. A communication system, characterized by comprises a terminal device for executing the method of any one of claims 1-11, and a first network device for executing the method of any one of claims 12-15, and a second network device for executing the method of claim 16, or comprises a terminal device for executing the method of any one of claims 17-20, and a first network device for executing the method of claim 21 or 22, and a second network device for executing the method of claim 23.

28. A computer-readable storage medium, characterized in that, The computer readable storage medium has stored thereon computer programs or instructions, which, when executed on a computer, implement the method of any one of claims 1-11, or the method of any one of claims 12-15, or the method of claim 16, or the method of any one of claims 17-20, or the method of claim 21 or 22, or the method of claim 23.

29. A computer program product, characterised in that, A computer program comprising computer readable instructions which, when executed by an apparatus, implement the method of any of claims 1-11, or when executed by an apparatus, implement the method of any of claims 12-15, or when executed by an apparatus, implement the method of claim 16, or when executed by an apparatus, implement the method of any of claims 17-20, or when executed by an apparatus, implement the method of claim 21 or 22, or when executed by an apparatus, implement the method of claim 23.

30. A chip system, characterized by Comprising: a processor configured to perform the method of any of claims 1-11, or to perform the method of any of claims 12-15, or to perform the method of claim 16, or to perform the method of any of claims 17-20, or to perform the method of claim 21 or 22, or to perform the method of claim 23.

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