Communication method and device

Abstract

Provided are a communication method and apparatus, a terminal device receiving first information from a first network device on a first cell, the first information being used for indicating a plurality of time domain configuration information and a plurality of effective conditions, the plurality of time domain configuration information and the plurality of effective conditions being in one-to-one correspondence; the first cell is a service cell of the terminal equipment; when the terminal device determines that a first effective condition is satisfied, the terminal device receives a synchronization signal and a physical broadcast channel block SSB from a second network device on a second cell based on first time domain configuration information corresponding to the first effective condition, the second cell is an adjacent cell of a first cell, the first effective condition belongs to a plurality of effective conditions, and the first time domain configuration information corresponds to the first effective condition. The first time domain configuration information belongs to multiple pieces of time domain configuration information. Compared with the method that the network equipment configures multiple pieces of time domain configuration information for the terminal equipment for multiple times, the method has the advantage that the processing load of the terminal equipment and the network equipment can be reduced.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a communication method and apparatus thereof. Background Art

[0002] Network devices periodically send synchronization signals and physical broadcast channel blocks (SSBs) in each cell so that terminal devices can perform initial access to the cell, cell handover, beam tracking, etc. To ensure that terminal devices accurately and completely measure all SSBs in the cell and reduce unnecessary measurement power consumption of terminal devices, network devices configure time-domain resources for receiving SSBs for terminal devices according to the serving cell of the terminal device.

[0003] In a non-terrestrial network (NTN), network devices or some network device functions are deployed on high-altitude platforms or satellites. As the high-altitude platform or satellite moves, the distance between the network device and the terminal device changes, and then the transmission delay between the network device and the terminal device also changes. This requires the network device to reconfigure the time-domain resources for receiving SSBs for the terminal device according to the serving cell of the terminal device. As Figure 1 shown, the time-domain resources for the network device to send SSBs in the serving cell and the time-domain resources for the terminal device to receive SSBs are theoretically the same. However, as the network device moves (assuming the terminal device does not move), the time-domain resources for the terminal device to actually receive SSBs will shift compared to the time-domain resources for the network device to send SSBs in the serving cell. If the terminal device still uses the previously configured time-domain resources to receive SSBs, it will cause the terminal device to not completely receive all SSBs. In addition, the terminal device listens for SSBs in the time-domain resources where the network device does not send SSBs, which will generate unnecessary measurement power consumption.

[0004] In a scenario where the network device moves frequently, such as when the network device is deployed on a satellite and the satellite moves frequently, which causes the height of the satellite from the ground to change frequently and the transmission delay between the network device and the terminal device to change frequently, it is necessary for the network device to frequently configure the time-domain resources for receiving SSBs for the terminal device according to the serving cell of the terminal device.

[0005] In a scenario where the terminal device needs to search for SSBs sent by the network device in neighboring cells, such as adding a neighboring cell as a secondary cell, cell handover, etc., it is also necessary for the network device to frequently configure the time-domain resources for the terminal device to receive SSBs sent by the network device in neighboring cells, resulting in a large processing load on both the terminal device and the network device. Summary of the Invention

[0006] An embodiment of the present application provides a communication method and its device, which are used to reduce the processing loads of a terminal device and a network device.

[0007] In a first aspect, the present application provides a communication method. This method can be executed by a terminal device, or by other devices including the functions of the terminal device, or by a chip system (which can also be replaced by a chip) or other functional modules that can implement the functions of the terminal device, and the chip system or functional module is, for example, disposed in the terminal device. Taking the example that this method is executed by the terminal device for introduction: The terminal device receives first information from a first network device on a first cell; wherein, the first information is used to indicate a plurality of time domain configuration information and a plurality of activation conditions, and the plurality of time domain configuration information and the plurality of activation conditions correspond one by one; the first cell is the serving cell of the terminal device; when the terminal device determines that a first activation condition is met, it receives a synchronization signal and a physical broadcast channel block SSB from a second network device on a second cell based on the first time domain configuration information corresponding to the first activation condition; wherein, the second cell is a neighbor cell of the first cell, the first network device and the second network device are the same or different, the first activation condition belongs to the plurality of activation conditions, and the first time domain configuration information belongs to the plurality of time domain configuration information.

[0008] In this embodiment, the network device configures, for the terminal device at one time, a plurality of time domain configuration information for measuring the SSB of the neighbor cell and the activation condition corresponding to each time domain configuration information. The terminal device can periodically or in real time determine whether any of the activation conditions is met. When the terminal device determines that any of the activation conditions is met, it uses the time domain configuration information corresponding to the activation condition to receive the SSB of the neighbor cell. The network device does not need to frequently configure the time domain configuration information for measuring the neighbor cell for the terminal device. Configuring a plurality of time domain configuration information for the terminal device at one time by the network device compared with the network device configuring a plurality of time domain configuration information for the terminal device multiple times can save the signaling interaction between the network device and the terminal device, and can reduce the processing loads of the terminal device and the network device.

[0009] In a possible implementation, any one of the foregoing activation conditions includes one or more of the following: propagation delay difference (PDD) condition, distance condition, distance difference condition, time condition, reception condition for the synchronization signal block (SSB) transmitted by the first network device on the first cell; the PDD is the difference between a first transmission delay and a second transmission delay, the first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different, or the first transmission delay is the transmission delay between the terminal device and the first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and the second satellite corresponding to the second cell, the first network device and the second network device may be the same or different, and the first satellite and the second satellite are different; the distance is the distance between the terminal device and a reference point corresponding to the first cell; the distance difference is the difference between a first distance and a second distance, the first distance is the distance between the terminal device and a reference point corresponding to the first cell, and the second distance is the distance between the terminal device and a reference point corresponding to the second cell.

[0010] In a possible implementation, the terminal device further receives second information from the first network device on the first cell, and the second information is used to indicate the SSBs to be measured corresponding to the respective multiple time domain configuration information; the terminal device receives, on the second cell, the SSBs to be measured corresponding to the first time domain configuration information based on the first time domain configuration information corresponding to the first activation condition from the second network device.

[0011] In this implementation, the terminal device only needs to search for these SSBs to be measured within the time window configured by the first time domain configuration information, and does not need to search for the SSBs that do not need to be measured, which can save the power consumption of the terminal device.

[0012] In a possible implementation, the terminal device further sends third information to the first network device on the first cell, and the third information is used to indicate the first time domain configuration information.

[0013] In this implementation, the first network device knows, according to the activated time domain configuration information, that the terminal device will perform neighbor cell measurement within the time window of this time domain configuration information, so that the first network device performs reasonable scheduling within this time window, for example, does not schedule the terminal device during some time periods within this time window.

[0014] Second aspect, the present application provides a communication method. This method can be executed by a first network device, or by other devices including the functions of the first network device, or by a chip system (which can also be replaced by a chip) or other functional modules that can implement the functions of the first network device. The chip system or functional module is, for example, disposed in the first network device. Taking the example where this method is executed by the first network device: The first network device generates first information; the first network device sends the first information to a terminal device on a first cell; wherein, the first information is used to indicate a plurality of time domain configuration information and a plurality of activation conditions, and the plurality of time domain configuration information and the plurality of activation conditions correspond one by one. The first information is used for when any activation condition is met, the terminal device receives a synchronization signal and a physical broadcast channel block SSB from a second network device on a second cell based on any time domain configuration information corresponding to the any activation condition. The first cell is the serving cell of the terminal device, the second cell is a neighboring cell of the first cell, and the first network device and the second network device are the same or different.

[0015] In this embodiment, the network device configures, for the terminal device at one time, a plurality of time domain configuration information for measuring the SSB of neighboring cells and the activation conditions corresponding to each time domain configuration information. The terminal device can periodically or in real time determine whether any of the activation conditions is met. When the terminal device determines that any activation condition is met, it uses the time domain configuration information corresponding to the any activation condition to receive the SSB of the neighboring cell. The network device does not need to frequently configure the time domain configuration information for measuring neighboring cells for the terminal device. Configuring a plurality of time domain configuration information for the terminal device at one time by the network device can save the signaling interaction between the network device and the terminal device compared with the network device configuring a plurality of time domain configuration information for the terminal device multiple times, and can reduce the processing loads of the terminal device and the network device.

[0016] In a possible implementation, any of the effective conditions includes one or more of the following: propagation delay difference (PDD) condition, distance condition, distance difference condition, time condition, reception condition for the SSB transmitted by the first network device on the first cell; the PDD is the difference between a first transmission delay and a second transmission delay, the first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different, or the first transmission delay is the transmission delay between the terminal device and the first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and the second satellite corresponding to the second cell, the first network device and the second network device may be the same or different, and the first satellite and the second satellite are different; the distance is the distance between the terminal device and the reference point corresponding to the first cell; the distance difference is the difference between a first distance and a second distance, the first distance is the distance between the terminal device and the reference point corresponding to the first cell, and the second distance is the distance between the terminal device and the reference point corresponding to the second cell.

[0017] In a possible implementation, the first network device also sends second information to the terminal device on the first cell, and the second information is used to indicate the SSBs to be measured corresponding to the respective multiple time domain configuration information; when any effective condition is satisfied, the second information is used for the terminal device to receive, based on any time domain configuration information corresponding to the any effective condition, the SSBs to be measured corresponding to the any time domain configuration information sent by the second network device on the second cell.

[0018] In this implementation, the terminal device only needs to search for these SSBs to be measured within the time window configured by the first time domain configuration information, and does not need to search for the SSBs that do not need to be measured, which can save the power consumption of the terminal device.

[0019] In a possible implementation, the first network device also receives third information from the terminal device on the first cell, and the third information is used to indicate the time domain configuration information that satisfies the effective condition; the first network device schedules the terminal device based on the time domain configuration information that satisfies the effective condition.

[0020] In this implementation, the first network device learns that the terminal device will perform neighbor cell measurement within the time window of the time domain configuration information according to the effective time domain configuration information, so that the first network device makes a reasonable schedule within this time window, for example, does not schedule the terminal device during some time periods within this time window.

[0021] In a third aspect, the present application provides a communication method. This method can be executed by a terminal device, or by other devices including the functions of the terminal device, or by a chip system (which can also be replaced by a chip) or other functional modules. The chip system or functional module can implement the functions of the terminal device, and the chip system or functional module is, for example, disposed in the terminal device. Taking the case where this method is executed by the terminal device as an example for introduction: The terminal device receives first information from a first network device on a first cell. The first information is used to indicate a plurality of time domain configuration information and a plurality of identifiers. The plurality of time domain configuration information and the plurality of identifiers are in one-to-one correspondence. Any one of the time domain configuration information is used for the terminal device to receive a synchronization signal and a physical broadcast channel block SSB. The terminal device receives second information from the first network device on the first cell. The second information is used to indicate a first identifier. The first identifier is used to indicate first time domain configuration information. The first identifier belongs to the plurality of identifiers, and the first time domain configuration information belongs to the plurality of time domain configuration information. The second information is carried in a layer 1 or layer 2 message. The terminal device receives the SSB from a second network device on a second cell based on the first time domain configuration information. The second cell is a neighboring cell of the first cell, and the first network device and the second network device may be the same or different.

[0022] In this embodiment, the first network device configures a plurality of time domain configuration information and their respective corresponding identifiers for the terminal device at one time. The first network device then determines the effective time domain configuration information from the configured plurality of time domain configuration information, and indicates the identifier corresponding to the effective time domain configuration information to the terminal device. The terminal device can then use the time domain configuration information corresponding to the identifier to receive the SSB of the neighboring cell. Generally, the time domain configuration information is sent to the terminal device through RRC signaling / high-layer signaling, and the identifier of the effective time domain configuration information is sent to the terminal device through a layer 1 or layer 2 message. For the terminal device and the network device, the processing load of processing RRC signaling is larger than that of processing a layer 1 or layer 2 message. Therefore, configuring a plurality of time domain configuration information for the terminal device at one time by the network device can save the signaling interaction between the network device and the terminal device, and can reduce the processing load of the terminal device and the network device.

[0023] In a possible implementation manner, the terminal device also sends third information to the first network device on the first cell. The third information is used to indicate a first parameter, and the first parameter is used to determine the first time domain configuration information from the plurality of time domain configuration information.

[0024] In this implementation manner, the first network device determines the effective first time domain configuration information through the first parameter reported by the terminal device, and the accuracy is high.

[0025] In a possible implementation, the first parameter specifically includes one or more of the following: a first PDD, where the first PDD is the difference between a first transmission delay and a second transmission delay, the first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different, or the first transmission delay is the transmission delay between the terminal device and the first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and the second satellite corresponding to the second cell, and the first network device and the second network device may be the same or different, and the first satellite and the second satellite are different; a first distance, where the first distance is the distance between the terminal device and a reference point corresponding to the first cell; a first distance difference, where the first distance difference is the difference between the first distance and the second distance, the first distance is the distance between the terminal device and a reference point corresponding to the first cell, and the second distance is the distance between the terminal device and a reference point corresponding to the second cell; the reception information of the terminal device for the SSB sent by the first cell.

[0026] In a possible implementation, the terminal device also receives fourth information from the first network device on the first cell, and the fourth information is used to indicate the SSBs that need to be measured corresponding to the respective first time domain configuration information; the terminal device receives the SSBs that need to be measured corresponding to the first time domain configuration information from the second network device on the second cell based on the first time domain configuration information.

[0027] In this implementation, the terminal device can search for these SSBs that need to be measured within the time window configured by the first time domain configuration information, and there is no need to search for the SSBs that do not need to be measured, which can save the power consumption of the terminal device.

[0028] Fourth aspect, the present application provides a communication method, which can be executed by a first network device, or by other devices including the functions of the first network device, or by a chip system (which can also be replaced by a chip) or other functional modules, and the chip system or functional module can implement the functions of the first network device, and the chip system or functional module is, for example, disposed in the first network device. Taking the method being executed by the first network device as an example for introduction: The first network device sends first information to a terminal device on a first cell, and the first information is used to indicate multiple time domain configuration information and multiple identifiers, and the multiple time domain configuration information and the multiple identifiers correspond one by one; The first network device sends second information to the terminal device on the first cell, and the second information is used to indicate a first identifier, and the first identifier is used to indicate first time domain configuration information, and the first identifier belongs to the multiple identifiers, and the first time domain configuration information belongs to the multiple time domain configuration information; The first time domain configuration information is used for the terminal device to receive a synchronization signal and a physical broadcast channel block SSB sent by a second network device on a second cell, and the second cell is a neighboring cell of the first cell, and the first network device and the second network device are the same or different, and the second information is carried in a layer 1 or layer 2 message.

[0029] In this embodiment, the first network device configures multiple time domain configuration information and their respective corresponding identifiers for the terminal device at one time. The first network device then determines the effective time domain configuration information from the configured multiple time domain configuration information, and indicates the identifier corresponding to the effective time domain configuration information to the terminal device, and the terminal device can use the time domain configuration information corresponding to the identifier to receive the SSB of the neighboring cell. Usually, the time domain configuration information is sent to the terminal device through RRC signaling / high layer signaling, and the identifier of the effective time domain configuration information is sent to the terminal device through a layer 1 or layer 2 message. For the terminal device and the network device, the processing load of processing RRC signaling is larger than that of processing a layer 1 or layer 2 message. Therefore, configuring multiple time domain configuration information for the terminal device at one time by the network device compared with the network device configuring multiple time domain configuration information for the terminal device multiple times can save the signaling interaction between the network device and the terminal device, and can reduce the processing load of the terminal device and the network device.

[0030] In a possible implementation manner, the first network device also receives third information from the terminal device on the first cell, and the third information is used to indicate a first parameter, and the first parameter is used to determine the first time domain configuration information from the multiple time domain configuration information.

[0031] In this implementation manner, the first network device determines the effective first time domain configuration information through the first parameter reported by the terminal device, and the accuracy is high.

[0032] In a possible implementation, the first parameter specifically includes one or more of the following: a first PDD, where the first PDD is the difference between a first transmission delay and a second transmission delay, the first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different. Alternatively, the first transmission delay is the transmission delay between the terminal device and the first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and the second satellite corresponding to the second cell, and the first network device and the second network device may be the same or different, and the first satellite and the second satellite are different; a first distance, where the first distance is the distance between the terminal device and a reference point corresponding to the first cell; a first distance difference, where the first distance difference is the difference between a first distance and a second distance, the first distance is the distance between the terminal device and a reference point corresponding to the first cell, and the second distance is the distance between the terminal device and a reference point corresponding to the second cell; and the receiving information of the terminal device for the SSB sent by the first cell.

[0033] In a possible implementation, the first network device further sends fourth information to the terminal device on the first cell, and the fourth information is used to indicate the SSB to be measured corresponding to the first time domain configuration information; the fourth information is used for the terminal device to receive, based on the first time domain configuration information, the SSB to be measured corresponding to the first time domain configuration information sent by the second network device on the second cell.

[0034] In this implementation, the terminal device can search for these SSBs to be measured within the time window configured by the first time domain configuration information, and the SSBs that do not need to be measured do not need to be searched, which can save the power consumption of the terminal device.

[0035] In a fifth aspect, a communication device is provided. The communication device may be the terminal device described in the first aspect or the third aspect above. The communication device has the functions of the above terminal device. The communication device is, for example, a functional module in the terminal device, such as a baseband device or a chip system, etc. Alternatively, the communication device may be the first network device described in the second aspect or the fourth aspect above. The communication device has the functions of the above first network device. The communication device is, for example, a functional module in the first network device, such as a baseband device or a chip system, etc.

[0036] In an alternative implementation, the communication device includes a baseband device and a radio frequency device. In another alternative implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The transceiver unit can implement the sending function and the receiving function. When the transceiver unit implements the sending function, it can be referred to as a sending unit (sometimes also referred to as a sending module). When the transceiver unit implements the receiving function, it can be referred to as a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit can be the same functional module, and this functional module is called the transceiver unit, which can implement the sending function and the receiving function; or, the sending unit and the receiving unit can be different functional modules, and the transceiver unit is a general term for these functional modules.

[0037] In a possible implementation, the communication device further includes a storage unit (sometimes also referred to as a storage module). The processing unit is used to be coupled with the storage unit and execute the programs or instructions in the storage unit, enabling the communication device to execute the functions of the terminal device described in the first aspect or the third aspect above, or execute the functions of the first network device described in the second aspect or the fourth aspect above.

[0038] When the communication device is the terminal device described in the first aspect above, it includes at least one of the following multiple possible implementations:

[0039] In a possible implementation, the transceiver unit is used to receive first information from a first network device on a first cell; wherein, the first information is used to indicate multiple time domain configuration information and multiple activation conditions, and the multiple time domain configuration information and the multiple activation conditions correspond one by one; the first cell is the serving cell of the communication device; and when a first activation condition is met, based on the first time domain configuration information corresponding to the first activation condition, receive a synchronization signal and a physical broadcast channel block SSB from a second network device on a second cell; wherein, the second cell is a neighbor cell of the first cell, the first network device and the second network device are the same or different, the first activation condition belongs to the multiple activation conditions, and the first time domain configuration information belongs to the multiple time domain configuration information.

[0040] In a possible implementation, the transceiver unit is further configured to receive second information from the first network device on the first cell, where the second information is used to indicate the SSBs to be measured corresponding to the respective multiple time domain configuration information; when the transceiver unit is configured to receive the SSB from the second network device on the second cell based on the first time domain configuration information corresponding to the first activation condition, it is specifically configured to: based on the first time domain configuration information corresponding to the first activation condition, receive on the second cell the SSBs to be measured corresponding to the first time domain configuration information from the second network device.

[0041] In a possible implementation, the transceiver unit is further configured to send third information to the first network device on the first cell, where the third information is used to indicate the first time domain configuration information.

[0042] When the communication device is the first network device described in the second aspect above, it includes at least one of the following multiple possible implementations:

[0043] In a possible implementation, the processing unit is further configured to generate first information; the transceiver unit is configured to send the first information to the terminal device on the first cell; where the first information is used to indicate multiple time domain configuration information and multiple activation conditions, and the multiple time domain configuration information and the multiple activation conditions correspond one by one, and the first information is used to, when any activation condition is met, enable the terminal device to receive the synchronization signal and physical broadcast channel block SSB from the second network device on the second cell based on any time domain configuration information corresponding to the any activation condition, the first cell is the serving cell of the terminal device, the second cell is a neighbor cell of the first cell, and the communication device and the second network device are the same or different.

[0044] In a possible implementation, the transceiver unit is further configured to send second information to the terminal device on the first cell, where the second information is used to indicate the SSBs to be measured corresponding to the respective multiple time domain configuration information; the second information is used to, when any activation condition is met, enable the terminal device to receive the SSBs to be measured corresponding to the any time domain configuration information sent by the second network device on the second cell based on any time domain configuration information corresponding to the any activation condition.

[0045] In a possible implementation, the transceiver unit is further configured to receive third information from the terminal device on the first cell, where the third information is used to indicate the time domain configuration information that meets the activation condition; the processing unit is further configured to schedule the terminal device based on the time domain configuration information that meets the activation condition.

[0046] When the communication device is the terminal device described in the third aspect above, it includes at least one of the following various possible implementation manners:

[0047] In a possible implementation manner, the transceiver unit is configured to receive first information from a first network device on a first cell, where the first information is used to indicate a plurality of time domain configuration information and a plurality of identifiers, and the plurality of time domain configuration information and the plurality of identifiers are in one-to-one correspondence, and any one of the time domain configuration information is used for the communication device to receive a synchronization signal and a physical broadcast channel block SSB; and receive second information from the first network device on the first cell, where the second information is used to indicate a first identifier, the first identifier is used to indicate first time domain configuration information, the first identifier belongs to the plurality of identifiers, and the first time domain configuration information belongs to the plurality of time domain configuration information, and the second information is carried in a layer 1 or layer 2 message; and receive the SSB from a second network device on a second cell based on the first time domain configuration information, where the second cell is a neighboring cell of the first cell, and the first network device and the second network device are the same or different.

[0048] In a possible implementation manner, the transceiver unit is further configured to send third information to the first network device on the first cell, where the third information is used to indicate a first parameter, and the first parameter is used to determine the first time domain configuration information from the plurality of time domain configuration information.

[0049] In a possible implementation manner, the transceiver unit is further configured to receive fourth information from the first network device on the first cell, where the fourth information is used to indicate the SSBs to be measured corresponding to the first time domain configuration information respectively; when the transceiver unit is configured to receive the SSB from a second network device on a second cell based on the first time domain configuration information, it is specifically configured to: receive the SSB to be measured corresponding to the first time domain configuration information from the second network device on the second cell based on the first time domain configuration information.

[0050] When the communication device is the first network device described in the fourth aspect above, it includes at least one of the following various possible implementation manners:

[0051] In a possible implementation, the transceiver unit is configured to send first information to a terminal device on a first cell, where the first information is used to indicate multiple time domain configuration information and multiple identifiers, and the multiple time domain configuration information and the multiple identifiers are in one-to-one correspondence; and to send second information to the terminal device on the first cell, where the second information is used to indicate a first identifier, the first identifier is used to indicate first time domain configuration information, the first identifier belongs to the multiple identifiers, and the first time domain configuration information belongs to the multiple time domain configuration information; the first time domain configuration information is used for the terminal device to receive a synchronization signal and a physical broadcast channel block SSB sent by a second network device in a second cell, the second cell is a neighboring cell of the first cell, the communication device and the second network device are the same or different, and the second information is carried in a layer 1 or layer 2 message.

[0052] In a possible implementation, the transceiver unit is further configured to receive third information from the terminal device on the first cell, where the third information is used to indicate a first parameter, and the first parameter is used to determine the first time domain configuration information from the multiple time domain configuration information.

[0053] In a possible implementation, the transceiver unit is further configured to send fourth information to the terminal device on the first cell, where the fourth information is used to indicate the SSB to be measured corresponding to the first time domain configuration information; the fourth information is used for the terminal device to receive, based on the first time domain configuration information, the SSB to be measured corresponding to the first time domain configuration information sent by the second network device in the second cell.

[0054] In a sixth aspect, a communication device is provided, including an interface circuit and a processor. Optionally, a memory is further included. The memory is used to store a computer program, and the processor is coupled to the memory and the interface circuit. When the processor reads the computer program or instruction, the communication device is caused to execute the method performed by the terminal device in the first aspect or the third aspect, or execute the method performed by the first network device in the second aspect or the fourth aspect. Exemplarily, the interface circuit is used to receive a signal from another communication device outside the communication device and transmit it to the processor, or send a signal from the processor to another communication device outside the communication device. The processor is used to implement the method performed by the terminal device in the first aspect or the third aspect through a logic circuit or by executing code instructions, or to implement the method performed by the first network device in the second aspect or the fourth aspect.

[0055] In the seventh aspect, a communication device is provided, comprising a processor and, optionally, a memory; the processor and the memory are coupled; the memory is used to store computer programs or instructions; the processor is used to execute part or all of the computer programs or instructions in the memory, and when the part or all of the computer programs or instructions are executed, it is used to implement the functions of the terminal device in the first or third aspect above, or to implement the functions of the first network device in the second or fourth aspect above.

[0056] In one possible implementation, the apparatus may further include a transceiver configured to transmit a signal processed by the processor or receive a signal input to the processor. The transceiver may perform the transmitting or receiving actions performed by the terminal device in the first or third aspect, or be configured to implement the functions of the first network device in the second or fourth aspect.

[0057] In a possible implementation, the processing unit in the fifth aspect can be implemented by the processor, the storage unit in the fifth aspect can be implemented by the memory, and the transceiver unit in the fifth aspect can be implemented by the transceiver.

[0058] In an eighth aspect, a communication system is provided, comprising a terminal device and a first network device, wherein the terminal device is configured to execute the method performed by the terminal device as described in the first or third aspect, and the first network device is configured to execute the method performed by the network device as described in the second or fourth aspect. For example, the terminal device may be implemented using the communication apparatus described in the fifth aspect, and the first network device may be implemented using the communication apparatus described in the fifth aspect.

[0059] In a ninth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store computer programs or instructions, which, when executed, enables the method in the first aspect, or the second aspect, or the third aspect, or the fourth aspect to be implemented.

[0060] In a tenth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the method in the first aspect, or the second aspect, or the third aspect, or the fourth aspect to be implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic diagram of time domain resource configuration provided by this application;

[0062] Figure 2a 、 Figure 2b 、 Figure 2c 、 Figure 2d and Figure 2eSchematic diagram of an architecture of a communication system provided by the present application respectively;

[0063] Figure 3 , Figure 4 , Figure 5 , Figure 6 Schematic diagram of a communication method flow provided by the present application respectively;

[0064] Figure 7 Structural diagram of a communication device provided by the present application;

[0065] Figure 8 Structural diagram of a communication device provided by the present application. Detailed implementation manners

[0066] The technical solution of the present application can be applied to a terrestrial network (TN), and can also be applied to a non-terrestrial network (NTN), such as a satellite network. The technical solution of the present application can be applied to various wireless communication systems, and can be but is not limited to being applied to a fourth-generation mobile communication technology (4G) system (also known as a long-term evolution (LTE) system), a fifth-generation mobile communication technology (5G) system (also known as a new radio (NR) system), or can also be applied to a next-generation mobile communication system or other similar communication systems (such as a sixth-generation mobile communication technology (6G) system), etc., and no specific limitation is made.

[0067] In addition, the technical solution of the present application can be applied to a device-to-device (D2D) scenario, such as an NR-D2D scenario, etc., or can be applied to a V2X scenario, such as an NR-V2X scenario, etc. The technical solution of the present application can also be applied to fields such as intelligent driving, assisted driving, or intelligent connected vehicles, or factory manufacturing scenarios.

[0068] Figure 2a , Figure 2b , Figure 2c and Figure 2d Schematic diagram of an architecture of a communication system applicable to embodiments of the present application. Embodiments of the present application take a satellite network as an example, but can be extended to other non-terrestrial networks. According to the working mode of the satellite, satellites are generally divided into two types:

[0069] One is a transparent form, and the satellite forwards radio frequency signals between the terminal device and the access network device located on the ground. As Figure 2aThe transparent satellite architecture (RAN architecture with transparent satellite) shown. The functions of the satellite are: radio frequency filtering, frequency conversion and amplification, that is, the satellite mainly acts as a layer 1 relay, regenerating the physical layer signals and not having other higher protocol layers. The terminal device accesses the access network device through the air interface. The satellite and the ground station (the ground station can also be called a non-terrestrial network gateway (NTN gateway)) forward the signals between the terminal device and the access network device located on the ground. The access network device is connected to the core network, and the core network communicates with the data network (DN).

[0070] Another is the regeneration form, where the satellite has all or part of the functions of the access network device, that is, all or part of the functions of the access network device are deployed on the satellite. As Figure 2b shown in the regeneration satellite architecture without an inter-satellite link (ISL), the satellite has the functions of the access network device. As Figure 2c shown in the regeneration satellite architecture with an inter-satellite link, the satellite has the functions of the access network device. As Figure 2d shown in the regeneration satellite architecture with the DU processing function of the access network device, the satellite has the functions of the DU of the access network device.

[0071] The terminal device accesses the access network device through the air interface. The access network device is deployed on the satellite. The access network device is connected to the core network deployed on the ground through the ground station. The core network communicates with the data network DN. The ground station is responsible for forwarding the signaling and service data between the satellite access network device and the core network. The access network device and the ground station communicate through the NG interface. The access network devices communicate with each other through the Xn interface. Exemplarily, there is an inter-satellite link ISL between satellites to complete the communication between the access network devices.

[0072] The functions of some of the network elements are briefly introduced below.

[0073] A terminal device, which can also be referred to as a user equipment (UE), is a device with wireless transceiver functions. It can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons, satellites, etc.). The terminal device can be a mobile phone, a pad, a computer with wireless transceiver functions, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the terminal device.

[0074] The (R)AN device in this application is a device that provides wireless communication functions for terminal devices. The (R)AN device is also referred to as an access network device. The RAN devices in this application include, but are not limited to: the next-generation base station (g nodeB, gNB) in 5G, evolved node B (eNB), 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), transmitting and receiving point (TRP), transmitting point (TP), mobile switching center, etc. In systems adopting different radio access technologies, the names of devices with base station functions may vary. For example, in the 5th generation (5G) system, it is called RAN or gNB (5G NodeB); in the LTE system, it is called evolved NodeB (eNB or eNodeB); in the 3rd generation (3G) system, it is called Node B, etc.

[0075] The data network DN can deploy various services and provide services such as data and / or voice for terminal devices. For example, DN is a private network of a smart factory. The sensors installed in the workshop of the smart factory can be terminal devices. Sensors and control servers are deployed in DN, and the control server can provide services for the sensors. The sensors can communicate with the control server, obtain instructions from the control server, and transmit the collected sensor data to the control server according to the instructions. Another example is that DN is the internal office network of a company. The mobile phones or computers of the company's employees can be terminal devices, and the mobile phones or computers of the employees can access information, data resources, etc. on the company's internal office network.

[0076] The core network part may include one or more of the following network elements:

[0077] The access management network element (which can also be called the mobility management network element) is a control plane network element provided by the operator's network and is responsible for access control and mobility management of the terminal device accessing the operator's network. For example, it includes functions such as mobile status management, allocation of user temporary identity identifiers, authentication, and users. In a 5G communication system, this access management network element can be an access and mobility management function (AMF) network element. In future communication systems, the access management network element can still be an AMF network element, or it can have other names, which are not limited in this application.

[0078] The session management network element is mainly responsible for session management in the mobile network, such as session establishment, modification, and release. Specific functions include allocating IP addresses for users and selecting user plane network elements that provide packet forwarding functions. In a 5G communication system, this session management network element can be a session management function (SMF) network element. In future communication systems, the session management network element can still be an SMF network element, or it can have other names, which are not limited in this application.

[0079] The user plane network element is responsible for the forwarding and reception of user data in the terminal device. It can receive user data from the data network and transmit it to the terminal device through the access network device; the user plane network element can also receive user data from the terminal device through the access network device and forward it to the data network. The transmission resources and scheduling functions provided for the terminal device in the user plane network element are managed and controlled by the SMF network element. In a 5G communication system, this user plane network element can be a user plane function (UPF) network element. In future communication systems, the user plane network element can still be a UPF network element, or it can have other names, which are not limited in this application.

[0080] The core network device and the access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the access network device can be integrated on the same physical device, or the functions of part of the core network device and part of the access network device can be integrated on one physical device.

[0081] Such as Figure 2eAs shown, a schematic diagram of a separated architecture of a central unit (CU) and a distributed unit (DU) is introduced. The CU includes a CU-control plane (CP) and a CU-user plane (UP); the CU-CP includes a radio resource control (RRC) layer and a packet data convergence protocol (PDCP)-C layer; the CU-UP includes a service data adaptation protocol (SDAP) layer and a PDCP-U layer; the DU includes a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer.

[0082] The following introduces the technical terms related to this application:

[0083] (1) Quasi-earth-fixed cell and earth-moving cell:

[0084] According to the satellite altitude, i.e., the satellite orbital altitude, the satellite system can be divided into geostationary satellites and medium-low earth orbit satellites. Geostationary satellites are also called stationary satellites. The satellite's movement speed is the same as the Earth's rotation system, so the satellite remains stationary relative to the ground. Correspondingly, the cells of geostationary satellites are also stationary. The coverage of geostationary satellite cells is relatively large, generally with a cell diameter of 500 km. Medium-low earth orbit satellites move relatively fast relative to the ground, so the service coverage areas provided by medium-earth orbit and low-earth orbit satellites also move accordingly.

[0085] The beam emitted by the satellite forms a cell on the ground, and a cell can be covered by one or more beams of the satellite. For medium-low earth orbit satellites, the cells covered by the satellite beam can be divided into two types:

[0086] Quasi-earth-fixed cell: The moving satellite dynamically adjusts the beam direction forming the cell, so that the position of the cell covered by the satellite beam on the ground remains stationary within a certain period of time.

[0087] Earth-moving cell: The moving satellite does not dynamically adjust the beam direction forming the cell, and the cell covered by the satellite beam moves with the movement of the satellite.

[0088] (2) Beam: It is divided into analog beam and digital beam. The analog beam is generated by multiple phase shifters of an analog filter. By configuring the phases of the multiple phase shifters, the signals generated by the superposition of multiple phases have different signal gains in different directions, thus forming a beam in space. In the process of digital beamforming, the participation of phase shifters is not required. Instead, digital weighting is performed on multiple signals sent from the baseband to the antenna to form a digital beam.

[0089] (3) Radio link monitoring (RLM) and radio link recovery:

[0090] (3.1) Radio link monitoring:

[0091] The terminal device monitors the downlink reference signal of the serving cell, evaluates the radio link quality, and indicates synchronization or out-of-synchronization to the upper layer.

[0092] To improve the detection efficiency, the network side configures a set of reference signals for the terminal device for RLM. These reference signals can be called the display reference signals of RLM. The reference signals can be channel state information-reference signal (CSI-RS) or SSB or other reference signals. It should be noted that CSI-RS or SSB in this application may also have other names, which are not limited in this application.

[0093] If the network side does not configure a reference signal set for the terminal device, but the network side configures a transmission configuration indication (TCI) state for the terminal device to receive the physical downlink control channel (PDCCH), and one or more CSI-RSs are included in these TCI states, the terminal device can use one of the CSI-RSs for RLM. That is, the network side implicitly configures the reference signal for wireless link monitoring, and the reference signal determined by the TCI state can be called the implicit reference signal for RLM. For example, if an active TCI state corresponding to receiving the PDCCH includes only one reference signal, the terminal device uses this reference signal for RLM. For example, an active TCI state corresponding to receiving the PDCCH includes two reference signals, and one of the reference signals is set to quasi co address (QCL)-Type D, then the terminal device uses the reference signal set to QCL-Type D for RLM (the network side will not set two reference signals to QCL-Type D for the terminal device). In addition, the network side will notify the change of the active TCI state corresponding to receiving the PDCCH, and accordingly change the reference signal used for RLM.

[0094] The physical layer of the terminal device periodically evaluates the wireless link quality, compares the wireless link quality with Qout and Qin, and decides whether to send a synchronization indication or an out-of-synchronization indication to the upper layer. Among them, Qout is defined as the level where the downlink wireless link cannot be reliably received, corresponding to an out-of-sync block error rate (BLERout); among them, Qin is defined as the level where the downlink wireless link can be received with a higher reliability than the reliability corresponding to Qout, corresponding to an in-sync block error rate (BLERin). When the wireless link quality corresponding to all reference signals used for RLM is worse than Qout, the physical layer of the terminal device sends an out-of-synchronization indication to the upper layer. When the wireless link quality corresponding to at least one reference signal used for RLM is better than Qin, the physical layer of the terminal device sends a synchronization indication to the upper layer.

[0095] (3.2) Wireless link recovery (which can also be called beam failure recovery (BFR) or beam failure detection (BFD)):

[0096] The network side configures a CSI-RS resource set for the terminal device to evaluate the wireless link quality during the link recovery process. The CSI-RS in these CSI-RS resource sets are all sent periodically, and the CSI-RS resource set includes at most two RSs.

[0097] If the network side does not configure a CSI-RS resource set for the terminal device, the terminal device uses the periodic CSI-RS in the activated TCI state corresponding to the received PDCCH as the CSI-RS in the CSI-RS resource set. And if a TCI state includes two RSs, the RS set to QCL-TypeD is used as the RS in the CSI-RS resource set. The set includes at most two RSs, and these RSs are all single-port RSs.

[0098] The physical layer of the terminal device evaluates the wireless link quality according to the RSs in the set and compares it with the threshold Qout,LR. Among them, the threshold Qout,LR is defined as the level where the downlink wireless link quality cannot be reliably received and the transmission error rate of the assumed PDCCH is 10%. When the wireless link quality evaluated by all the RSs in the set is worse than the threshold Qout,LR, the physical layer of the terminal device sends a beam failure indication message to the upper layer. The physical layer of the terminal device performs this process periodically.

[0099] The network side configures another candidate reference signal set for the terminal device to report candidate reference signals during the link recovery process. The set may include a periodic CSI-RS resource set or / and an SSB resource set. When the measurement result of the reference signal receiving power (RSRP) of the candidate reference signals in the candidate reference signal resource set is higher than or equal to the threshold Qin,LR, the terminal device provides the indices of these candidate reference signals to the network side.

[0100] For a serving cell configured for beam failure detection, when the MAC layer of the terminal device receives the beam failure indication information of the serving cell from the physical layer, the MAC layer of the terminal device will start or restart a timer. If the number of beam failure indication messages received by the MAC layer of the terminal device for the serving cell is greater than the set threshold, if the serving cell is a primary cell (PCell) or a primary secondary cell (PSCell), the terminal device initiates a random access procedure in the cell; if the serving cell is a secondary cell (SCell), the terminal device triggers the beam recovery procedure of the SCell. For more details, please refer to the description of the link recovery procedure in Section 6 of Protocol 38.213.

[0101] The terminal device performs radio link monitoring / radio link recovery according to the reference signal set configured by the network device. In the moving cell scenario, due to the movement of the satellite, the satellite beam covering the location of a certain terminal device changes accordingly. The beam is the key to evaluating the quality of the reference signal. When the covering beam changes, the corresponding reference signal set also needs to change (the relationship between the reference signal and the beam). Therefore, due to the movement of the satellite, the network side needs to frequently update the reference signal set configuration for radio link monitoring / radio link recovery, resulting in a large amount of signaling interaction between the network device and the terminal device, and increasing the processing load of the terminal device and the network device.

[0102] (4) SSB-based measurement timing (the timing can also be replaced by timing) configuration (SSB-based measurement timing configuration, SMTC) information:

[0103] The SMTC information can indicate the time window for the terminal device to search for the SSB. The SMTC information includes: SMTC period information, SMTC duration information, and SMTC offset information. The protocol defines that the SMTC information includes SMTC1 information. Optionally, it also includes SMTC2 information. The STMC1 information is for all neighboring cells or all cells corresponding to a certain measurement frequency point. The SMTC2 information is for one or several specific cells. The SMTC2 information includes the cell identifier. The SMTC2 is an optional configuration. Not configuring the SMTC2 information is equivalent to using SMTC1 for SSB measurement for all neighboring cells.

[0104] The cell carrying SMTC1 information is SSB-MTC. The cell SSB-MTC contains two sub-cells, which carry respectively: periodicity and offset, and duration. Periodicity: indicates the repetition period of the measurement action (measuring / receiving SSB). The SMTC offset measures the starting subframe of the action within one period. Duration: indicates the duration that the measurement action should last after the measurement action starts.

[0105] The cell carrying SMTC2 information is SSB-MTC2. The cell SSB-MTC2 contains two sub-cells, which carry respectively: the cell identity list and the periodicity. The cell identity list indicates which cells are measured using SMTC2. Periodicity: indicates the repetition period of the measurement action (measuring / receiving SSB). The terminal device uses the duration configured in SMTC1 and the periodicity configured in SMTC2 for the cells in the cell identity list, and searches for SSB with the offset configured in SMTC1.

[0106] For more introduction about SMTC information, please refer to the reference signal measurement timing configuration introduced in 5.5.2.10 of 3GPP TS 38.331 V15.5.1 and the radio resource control information elements introduced in 6.3.2, which will not be elaborated here.

[0107] In Figure 2a 、 Figure 2b 、 Figure 2c and Figure 2d 's communication system, the movement of the satellite will cause the transmission delay between the access network device and the terminal device to change, which requires reconfiguring the time-domain resources for the terminal device to receive SSB. As Figure 1 shown, the time-domain resources for the access network device to send SSB and the time-domain resources for the terminal device to receive SSB are theoretically the same. However, with the movement of the satellite (assuming the terminal device does not move), the time-domain resources that the terminal device can actually receive SSB will be offset compared to the time-domain resources for the access network device to send SSB. If the terminal device still uses the previously configured time-domain resources to receive SSB, it will cause the terminal device to not receive all SSB completely. In addition, if the terminal device listens for SSB on the time-domain resources where the access network device does not send SSB, unnecessary measurement power consumption will be generated.

[0108] In scenarios where the terminal device needs to search for the SSB of neighboring cells, such as scenarios of adding neighboring cells as secondary cells, cell handover, etc., it is necessary to frequently configure the time-domain resources for the terminal device to receive the SSB sent by neighboring cells, resulting in a large amount of signaling interaction between the network device and the terminal device, and increasing the processing loads of the terminal device and the network device. In addition, the satellite needs to point to the terminal device through a beam to configure time-domain resources for the terminal device. However, the coverage range of one beam is limited, and this beam can only provide services for the terminal devices within the coverage range of this beam, and cannot schedule the terminal devices in other areas simultaneously, affecting the scheduling performance of the network device.

[0109] Based on this, the embodiments of the present application provide various communication methods to avoid the network device from frequently configuring the time-domain resource information for the terminal device to receive the SSB, and reduce the processing loads of the terminal device and the network device.

[0110] The methods provided by the various embodiments of the present application can be applied to Figure 2a 、 Figure 2b 、 Figure 2c and Figure 2d the network architectures shown in the figure or other network architectures. For example, the terminal devices involved in the various embodiments of the present application can be Figure 2a 、 Figure 2b 、 Figure 2c and Figure 2d the terminal devices therein, and the network devices involved in the various embodiments of the present application can be Figure 2a 、 Figure 2b 、 Figure 2c and Figure 2d the access network devices therein.

[0111] To better introduce the embodiments of the present application, the methods provided by the embodiments of the present application will be introduced below with reference to the accompanying drawings. In the following text, if there is no special description, in the accompanying drawings corresponding to the various embodiments of the present application, the steps indicated by the dashed lines are all optional steps.

[0112] Embodiment 1:

[0113] The network device configures multiple time-domain configuration information for the terminal device to measure the SSB of neighboring cells at one time and the corresponding activation conditions for each time-domain configuration information. The terminal device can periodically or in real time determine whether any of the activation conditions is satisfied. When the terminal device determines that any of the activation conditions is satisfied, it uses the time-domain configuration information corresponding to the satisfied activation condition to receive the SSB of the neighboring cell, and the network device does not need to frequently configure the time-domain configuration information for the terminal device to measure the neighboring cell.

[0114] In this Embodiment 1, the terminal device receives && from a **network device on ## cell, which can be replaced with the terminal device receiving && from ## cell in the **network device. For example, the terminal device receiving first information from a first network device on a first cell can be replaced with: the terminal device receiving first information from the first cell in the first network device. For another example, the terminal device receiving an SSB from a second network device on a second cell can be replaced with the terminal device receiving the SSB from the second cell in the second network device.

[0115] Figure 3 The flowchart shows a communication method provided by an embodiment of the present application, including the following steps:

[0116] Step 301: A first network device sends first information on a first cell. Correspondingly, a terminal device receives the first information on the first cell; the first information is used to indicate multiple time domain configuration information and multiple activation conditions, and the multiple time domain configuration information and the multiple activation conditions correspond one by one.

[0117] The first cell is the serving cell of the terminal device, and the first network device is the network device currently serving the terminal device.

[0118] One time domain configuration information is used to indicate a time window / measurement window / measurement time window. In one example, any time domain configuration information includes: a period, a duration, and an offset. The period represents the repetition period of receiving the SSB or represents the repetition period of the time window / measurement window / measurement time window. The period can be at the ms level, or symbol level, or subframe level, or slot level. For example, the period is 20 ms. The duration represents the duration after the start of receiving the SSB or represents the length of the time window / measurement window / measurement time window. The duration can be an integer multiple of the period or has nothing to do with the length of the period. The offset represents the interval of the starting point of receiving the SSB within one period compared to the starting point of the period. One time domain configuration information can be an SMTC information, and an SMTC information contains an SMTC1 information. Optionally, it also contains an SMTC2 information. The STMC1 information is for all cells or all neighboring cells, and the SMTC2 information is for one or several specific cells. The SMTC2 information includes the identification of the cell. The SMTC2 is an optional configuration. Not configuring the SMTC2 information is equivalent to all neighboring cells using SMTC1 for SSB measurement. For specific content, reference can be made to the above introduction about SMTC, which will not be repeated here.

[0119] The following describes how the terminal device determines the radio frame number (system frame number, SFN) and / or subframe number of the first subframe of the time window / measurement window / measurement time window corresponding to the current serving cell. For example, SFN mod T = (FLOOR(SMTC offset / 10)), where T = CEIL(SMTC period / 10), and CEIL() is the ceiling function. For example, if the SMTC period exceeds 5 subframes, then subframe = SMTC offset mod 10; otherwise, subframe = SMTC offset, or subframe = SMTC offset + 5. Here, the units of both the period and the offset are subframes.

[0120] The first information may be generated by the first network device. This first information may be referred to as measurement configuration information, and this first information may be carried in an RRC message / signal, for example, carried in an RRCReconfiguration message / signal. This first information may also indicate one or more of the following: measurement object, reporting configuration, measurement ID, measurement quantity configuration, and measurement gap (GAP) configuration, etc.

[0121] In Figure 2e the scenario of CU and DU separation as shown, the CU in the first network device generates the first information, and the CU of the first network device sends the first information to the terminal device through the DU.

[0122] The following introduces the effective conditions corresponding to the time domain configuration information:

[0123] Any of the effective conditions includes one or more of the following. It can be understood that the following numbers 1), 2),... 5), etc. are only for convenience of description, and this number does not represent the importance and priority of the content corresponding to this number:

[0124] 1), Propagation delay difference (PDD) condition: The PDD is the difference between the first transmission delay and the second transmission delay. In the scenario where the network device is deployed non - terrestrially, for example, when applied to Figure 2b , Figure 2c and Figure 2d in a communication system, the network device is deployed on a satellite and moves with the satellite. The first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different. In the scenario where the network device is deployed terrestrially, for example, when applied to Figure 2aIn a communication system, the network device does not move with the movement of the satellite, but the transmission delay between the terminal device and the network device changes with the movement of the satellite. The first transmission delay is the transmission delay between the terminal device and the first satellite corresponding to the first cell, and the second transmission delay is the transmission delay between the terminal device and the second satellite corresponding to the second cell. The first network device and the second network device may be the same or different, and the first satellite and the second satellite are different. The first satellite corresponding to the first cell is the satellite responsible for forwarding data and signaling between the terminal device and the first cell, and the beam emitted by the first satellite covers the first cell. The second satellite corresponding to the second cell is the satellite responsible for forwarding data and signaling between the terminal device and the second cell, and the beam emitted by the second satellite covers the second cell.

[0125] The PDD condition can be understood as the PDD range. For example, the first information indicates time domain configuration information 1 and time domain configuration information 2, and indicates that the PDD condition in the activation condition of time domain configuration information 1 is less than or equal to PDD1, and the PDD condition in the activation condition of time domain configuration information 2 is greater than PDD1. The terminal device determines the first PDD. When there are no other conditions in the activation condition except the PDD condition, when the first PDD is less than or equal to PDD1, it is determined that time domain configuration information 1 is activated; when the first PDD is greater than PDD1, it is determined that time domain configuration information 2 is activated.

[0126] For another example, the first information indicates 3 pieces of time domain configuration information, and indicates that the PDD condition in the activation condition of time domain configuration information 1 is less than or equal to PDD1, the PDD condition in the activation condition of time domain configuration information 2 is greater than PDD1 and less than PDD2, and the PDD condition in the activation condition of time domain configuration information 3 is greater than PDD2. The terminal device determines the first PDD. When there are no other conditions in the activation condition except the PDD condition, when the first PDD is less than or equal to PDD1, it is determined that time domain configuration information 1 is activated; when the first PDD is greater than PDD1 and less than PDD2, it is determined that time domain configuration information 2 is activated; when the first PDD is greater than PDD2, it is determined that time domain configuration information 3 is activated.

[0127] When the first network device and the second network device move respectively or the first satellite corresponding to the first cell and the second satellite corresponding to the second cell move respectively, the network side can pre-estimate the correlation between the propagation delay difference and the time domain resources for the second network device to send SSB in the second cell based on the movement trajectory of the satellite. Furthermore, the network side can determine the correlation between different time domain configuration information and PDD conditions and indicate it to the terminal device. So that the terminal device can receive the SSB of the second cell based on the time domain configuration information corresponding to the satisfied PDD condition.

[0128] 2) Distance condition: The distance is the distance between the terminal device and the reference point corresponding to the first cell. For example, the reference point is the center point of the coverage area of the first cell.

[0129] The distance condition can be understood as a distance range. For example, the first piece of information indicates time domain configuration information 1 and time domain configuration information 2, and indicates that the distance condition in the activation condition of time domain configuration information 1 is less than or equal to d1 or within the distance range D1, and the PDD condition in the activation condition of time domain configuration information 2 is greater than d1 or within the distance range D2. The terminal device determines the first distance. When there are no other conditions in the activation condition except the distance condition, when the first distance is less than or equal to d1 or within the distance range D1, it is determined that time domain configuration information 1 is activated; when the first distance is greater than d1 or within the distance range D2, it is determined that time domain configuration information 2 is activated.

[0130] In the earth-moving cell scenario, the position of the first cell changes with the movement of the satellite, and thus the distance between the terminal device and the reference point corresponding to the first cell also changes with the movement of the satellite. The network side can pre-estimate the correlation between the distance between the terminal device and the reference point corresponding to the first cell and the time domain resources for the second network device to send SSB in the second cell based on the movement trajectory of the satellite. Furthermore, the network side can determine the correlation between different time domain configuration information and distance conditions and indicate it to the terminal device. So that the terminal device can receive the SSB of the second cell based on the time domain configuration information corresponding to the satisfied distance condition.

[0131] In addition, this condition can also be applied to the scenario of a ground stationary cell with the terminal device moving.

[0132] 3) Distance difference condition: The distance difference is the difference between the first distance and the second distance. The first distance is the distance between the terminal device and the reference point corresponding to the first cell, and the second distance is the distance between the terminal device and the reference point corresponding to the second cell.

[0133] The distance difference condition can be understood as a distance difference range. For example, the first piece of information indicates time domain configuration information 1 and time domain configuration information 2, and indicates that the distance difference condition in the activation condition of time domain configuration information 1 is less than or equal to s1 or within the range S1, and the PDD condition in the activation condition of time domain configuration information 2 is greater than s1 or within the range S2. The terminal device determines the first distance difference. When there are no other conditions in the activation condition except the distance difference condition, when the first distance difference is less than or equal to s1 or within the range S1, it is determined that time domain configuration information 1 is activated; when the first distance difference is greater than s1 or within the range S2, it is determined that time domain configuration information 2 is activated.

[0134] In the scenario of an earth - moving cell, the positions of the first cell and / or the second cell change with the movement of the satellite. Then, the distance between the terminal device and the reference point corresponding to the first cell may change with the movement of the satellite, and the distance between the terminal device and the reference point corresponding to the second cell may change with the movement of the satellite. Consequently, the distance difference will change. The network side can pre - estimate the correlation between the distance difference and the time - domain resources for the second network device to send SSB in the second cell based on the satellite's motion trajectory. Furthermore, the network side can determine the correlation between different time - domain configuration information and distance - difference conditions and indicate it to the terminal device. So that the terminal device can receive the SSB of the second cell based on the time - domain configuration information corresponding to the satisfied distance - difference conditions.

[0135] In addition, this condition can also apply to the scenario where the terminal device moves in a ground - stationary cell.

[0136] 4) Time condition. The time condition can be understood as a time range or a certain time point. For example, the first information indicates time - domain configuration information 1, 2, and 3. The time condition in the activation condition corresponding to time - domain configuration information 1 indicated by the first information is time point t1 or time period t1 to t2. The time condition in the activation condition corresponding to time - domain configuration information 2 is time point t2 or time period t2 to t3. The time condition in the activation condition corresponding to time - domain configuration information 3 is time point t3 or time period t3 to t4. When there are no other conditions except the time - difference condition in the activation condition, the terminal device determines that time - domain configuration information 1 becomes effective at time point t1, waits until time point t2 to determine that time - domain configuration information 2 becomes effective, and waits until time point t3 to determine that time - domain configuration information 3 becomes effective.

[0137] The network side pre - estimates the correlation between the time information and the time - domain resources for the second network device to send SSB in the second cell based on the satellite's motion trajectory. Furthermore, the network side can determine the correlation between different time - domain configuration information and time conditions and indicate it to the terminal device. So that the terminal device can receive the SSB of the second cell based on the time - domain configuration information corresponding to the satisfied time conditions.

[0138] 5) The reception condition for the SSB sent by the first network device in the first cell.

[0139] The reception condition can be understood as the optimal reception beam condition. For example, the first piece of information indicates time domain configuration information 1 and time domain configuration information 2, and indicates that the optimal reception beam in the activation condition corresponding to time domain configuration information 1 is beam 1, and the optimal reception beam in the activation condition corresponding to time domain configuration information 2 is beam 2. When there are no other conditions in the activation condition except the reception condition, when the terminal device determines that the optimal reception beam for receiving the SSB from the first network device on the first cell is beam 1, time domain configuration information 1 becomes effective; when the terminal device determines that the optimal reception beam for receiving the SSB from the first network device on the first cell is beam 2, time domain configuration information 2 becomes effective.

[0140] In the scenario of an earth-moving cell, the position of the first cell changes with the movement of the satellite, and then the optimal beam for the terminal device to receive the SSB of the first cell may change with the movement of the satellite. The network side can pre-estimate the correlation between the optimal reception beam and the time domain resources for the second network device to send the SSB in the second cell based on the movement trajectory of the satellite. Furthermore, the network side can determine the correlation between different time domain configuration information and reception beam conditions and indicate it to the terminal device, so that the terminal device can receive the SSB of the second cell based on the time domain configuration information corresponding to the satisfied reception beam condition.

[0141] Step 302: When the terminal device determines that the first activation condition is satisfied, it receives the SSB from the second network device on the second cell based on the first time domain configuration information corresponding to the first activation condition.

[0142] It can be understood that if the first activation condition is satisfied, the first time domain configuration information corresponding to the first activation condition becomes effective, and the terminal device can receive the SSB based on the effective first time domain configuration information.

[0143] Step 302 can be replaced with: when the terminal device determines that any activation condition is satisfied, it receives the SSB from the second network device on the second cell based on the time domain configuration information corresponding to the any activation condition.

[0144] The terminal device can judge the activation condition at intervals, or periodically, or in real time. As long as one of the multiple activation conditions is satisfied, it can receive the SSB from the second network device on the second cell based on the time domain configuration information corresponding to the one activation condition.

[0145] The second cell is a neighbor cell of the first cell, and the first network device and the second network device may be the same or different. For example, in a scenario where a secondary cell needs to be added in carrier aggregation, the first network device and the second network device are the same, the first cell is the primary cell of the terminal device, and the second cell is the secondary cell of the terminal device. For example, in a scenario where a secondary node is added, the first network device and the second network device are different, the first network device is the primary node of the terminal device, and the second network device is the secondary node of the terminal device. For another example, in a cell handover scenario, the first network device and the second network device may be the same or different.

[0146] In Figure 2e In the scenario of CU and DU separation shown, the DU in the network device generates an SSB and sends the SSB.

[0147] Configuring multiple time domain configuration information for the terminal device by the network device at one time can save the signaling interaction between the network device and the terminal device compared with the network device configuring multiple time domain configuration information for the terminal device multiple times, and can reduce the processing load of the terminal device and the network device.

[0148] Step 302 describes that the terminal device receives the SSB from the second network device on the second cell based on the first time domain configuration information. The terminal device can continuously search for the SSB within the time window configured by the first time domain configuration information. In a possible implementation, the first network device indicates the SSB (SSB-to-measure) that needs to be measured to the terminal device, and the terminal device can search for these SSBs that need to be measured within the time window configured by the first time domain configuration information, and there is no need to search for the SSBs that do not need to be measured, which can save the power consumption of the terminal device. This example is usually for the moving cell scenario. Exemplarily, the first network device sends the second information to the terminal device on the first cell, and correspondingly, the terminal device receives the second information from the first network device on the first cell. The second information is used to indicate the SSBs that need to be measured corresponding to the respective multiple time domain configuration information. Then, the terminal device receives the SSBs that need to be measured corresponding to the first time domain configuration information from the second network device on the second cell based on the first time domain configuration information.

[0149] The second network device periodically sends the SSB on the second cell, and the second information can indicate the index of the SSB to be measured in one period. In one example, the second information can indicate the SSB to be measured in the form of a bitmap. The bit positions with a value of 1 represent the indexes of the SSBs to be measured, and the bit positions with a value of 0 represent the indexes of the SSBs that do not need to be measured. For example, 00110000 indicates that the SSBs with indexes 2 and 3 need to be measured.

[0150] The SSB to be measured is associated with the time domain configuration information. When the time domain configuration information becomes effective, the SSB to be measured also becomes effective. Alternatively, an independent activation condition is configured for the SSB to be measured, and the SSB to be measured becomes effective only when the independent activation condition is met.

[0151] The corresponding relationship between the SSB to be measured and the time domain configuration information may be one of the following possibilities: One possibility is that the SSBs to be measured corresponding to all time domain configuration information are the same. For example, the second network device periodically sends SSBs in the second cell. 32 SSBs are sent in one cycle, and the indexes are divided into 0 - 31. The SSBs to be measured corresponding to 3 time domain configuration information are all the SSBs with indexes 10 - 20. Another possibility is that the SSBs to be measured corresponding to some of the time domain configuration information are the same. For example, for 3 time domain configuration information, the SSBs to be measured corresponding to 2 of the time domain configuration information are the same, and the SSB to be measured corresponding to the other time domain configuration information is different or completely different from the other 2. For example, the second network device periodically sends SSBs in the second cell. 32 SSBs are sent in one cycle, and the indexes are divided into 0 - 31. The SSBs to be measured corresponding to time domain configuration information 1 and 3 are SSB10 - 20, and the SSB to be measured corresponding to time domain configuration information 2 is SSB15 - 25. Another possibility is that the SSBs to be measured corresponding to all time domain configuration information are partially different or completely different. For example, the second network device periodically sends SSBs in the second cell. 32 SSBs are sent in one cycle, and the indexes are divided into 0 - 31. The SSB to be measured corresponding to time domain configuration information 1 is SSB10 - 20, the SSB to be measured corresponding to time domain configuration information 2 is SSB15 - 25, and the SSB to be measured corresponding to time domain configuration information 1 is SSB20 - 30.

[0152] In Figure 2e In the scenario of CU and DU separation shown, the CU in the first network device generates the second information, and the CU sends the second information to the terminal device through the DU.

[0153] In a possible implementation, the terminal device notifies the first network device of the effective time domain configuration information. For example, when the first effective condition is met, the terminal device sends the third information to the first network device on the first cell. Correspondingly, the first network device receives the third information on the first cell, and the third information is used to indicate the first time domain configuration information. The third information indicates the first identifier of the first time domain configuration information. For example, in step 301, the first information also indicates the identifiers corresponding to the multiple time domain configuration information, so the third information can indicate the identifier of the effective time domain configuration information, and the identifier is, for example, an index. Or the third information can indicate the satisfied effective condition. For example, for the propagation delay difference (PDD) condition, the third information can indicate the difference between the first transmission delay and the second transmission delay; for the distance condition, the third information can indicate the distance between the terminal device and the reference point corresponding to the first cell. For the distance difference condition, the third information can indicate the difference between the first distance and the second distance. For the SSB reception condition, the third information can indicate the optimal reception beam of the terminal device. The terminal device notifying the first network device of the effective time domain configuration information enables the first network device to reasonably schedule the terminal device. For example, the first network device knows from the effective time domain configuration information that the terminal device will perform neighbor cell measurement within the time window of the time domain configuration information, so the first network device makes a reasonable schedule within this time window. For example, the first network device does not schedule the terminal device during some time periods within this time window.

[0154] The third information can be sent to the first network device through an RRC message. In Figure 2e the scenario of CU and DU separation as shown, the third information can be sent to the CU in the first network device through an RRC message. After the CU parses the third information, it notifies the DU of the specific content of the effective time domain configuration information, and the DU makes a reasonable schedule for the terminal device based on the specific content of the effective time domain configuration information.

[0155] The third information can be sent to the first network device through an L1\L2 message. In Figure 2e the scenario of CU and DU separation as shown, the third information can be sent to the DU in the first network device through an L1\L2 message. After the DU parses the third information, the DU makes a reasonable schedule for the terminal device based on the specific content of the effective time domain configuration information. For example, the third information indicates the identifier of the effective time domain configuration information, and the CU has previously notified the DU of the multiple time domain configuration information and their corresponding identifiers. The DU can find the corresponding effective time domain configuration information based on the identifier indicated by the third information.

[0156] In step 302 described above, when the terminal device determines that the first activation condition is met, it receives the SSB from the second network device on the second cell based on the first time domain configuration information corresponding to the first activation condition. In one example, in the scenario where the terminal device sends the third information to the first network device, the terminal device may not need to consider the order of receiving the SSB from the second network device on the second cell based on the first time domain configuration information and sending the third information. In another example, after the terminal device determines that the first activation condition is met and successfully sends the third information, the terminal device receives the SSB from the second network device on the second cell based on the first time domain configuration information corresponding to the first activation condition.

[0157] In addition, even if the terminal device does not inform the first network device of the activated time domain configuration information, the first network device can also infer the time domain configuration information that becomes effective at different times or different time periods. The first network device knows that the terminal device will perform neighbor cell measurement within the time window of the time domain configuration information according to the activated time domain configuration information, so that the first network device can perform reasonable scheduling within this time window. For example, the first network device does not schedule the terminal device during certain time periods within this time window.

[0158] Embodiment 2: The network device configures multiple time domain configuration information and their respective identifiers for the terminal device at one time. Then the network device determines the activated time domain configuration information from the configured multiple time domain configuration information, and indicates the identifier corresponding to the activated time domain configuration information to the terminal device. The terminal device can then use the time domain configuration information corresponding to the identifier to receive the SSB of the neighbor cell.

[0159] Figure 4 The flowchart of a communication method provided by an embodiment of the present application is shown, including the following steps:

[0160] Step 401: The first network device sends the first information to the terminal device on the first cell. Correspondingly, the terminal device receives the first information on the first cell. The first information is used to indicate multiple time domain configuration information and multiple identifiers, and the multiple time domain configuration information and multiple identifiers correspond one by one.

[0161] The first cell is the serving cell of the terminal device, and the first network device is the network device currently serving the terminal device.

[0162] For the first information indicating multiple identifiers, it can be indicated in an explicit manner or in an implicit manner. This implicit manner, for example, implicitly indicates the identifier of the time domain configuration information through the order of the multiple time domain configuration information. For example, the identifier of the time domain configuration information with the earliest order is index 0.

[0163] The relevant content indicating multiple time domain configuration information in step 401 can refer to the description in step 301. Different from step 301, the first information in step 401 does not indicate the activation condition.

[0164] The identifier of the time domain configuration information can be the index of the time domain configuration information.

[0165] The first information can be generated by the first network device. This first information can be called measurement configuration information, and this first information can be carried in an RRC message / signal, for example, carried in an RRCReconfiguration message / signal. This first information can also indicate one or more of the following: measurement object, reporting configuration, measurement ID, measurement quantity configuration, and measurement gap (GAP) configuration, etc.

[0166] In Figure 2e In the scenario of CU and DU separation shown, the CU in the first network device generates the first information. The first network device in step 301 sending the first information to the terminal device can be the CU of the first network device sending the first information to the terminal device through the DU.

[0167] Optionally, step 402: The terminal device sends third information to the first network device in the first cell. Correspondingly, the first network device receives the third information on the first cell. The third information is used to indicate a first parameter, and the first parameter is used to determine a first time domain configuration information from the multiple time domain configuration information.

[0168] The third information is used to indicate a first parameter, including one or more of the following. It can be understood that the following serial numbers 1), 2) …… 5), etc. are only for convenience of description, and this serial number does not represent the importance and priority of the content corresponding to this serial number:

[0169] 1), The third information indicates the location information of the terminal device. For example, GPS location information. When the first network device and the second network device move respectively or the first satellite corresponding to the first cell and the second satellite corresponding to the second cell move respectively, the network side can pre-estimate the association relationship between the location information of the terminal device, the location information of the first cell, the location information of the second cell, and the time domain resources of the second network device sending the SSB in the second cell. After the terminal device reports the location information of the terminal device to the first network device, the first network device can determine the effective time domain configuration information based on the location information of the terminal device and indicate it to the terminal device. So that the terminal device can receive the SSB of the second cell based on the indicated time domain configuration information.

[0170] 2) The third piece of information is used to indicate a first PDD, where the first PDD is the difference between a first transmission delay and a second transmission delay. In a scenario where the network device is deployed in a non-terrestrial environment, such as when applied to Figure 2b , Figure 2c and Figure 2d communication systems, the network device is deployed on a satellite and moves with the satellite. The first transmission delay is the transmission delay between the terminal device and the first network device, and the second transmission delay is the transmission delay between the terminal device and the second network device, where the first network device and the second network device are different. In a scenario where the network device is deployed on the ground, such as when applied to Figure 2a communication systems, the network device does not move with the satellite, but the transmission delay between the terminal device and the network device changes with the movement of the satellite. The first transmission delay is the transmission delay between the terminal device and the first satellite corresponding to the first cell, and the second transmission delay is the transmission delay between the terminal device and the second satellite corresponding to the second cell. The first network device and the second network device may be the same or different, and the first satellite and the second satellite are different. The satellite corresponding to the first cell is responsible for forwarding data and signaling between the terminal device and the first cell, and the beam emitted by the first satellite covers the first cell. The satellite corresponding to the second cell is responsible for forwarding data and signaling between the terminal device and the second cell, and the beam emitted by the second satellite covers the second cell. The first network device and the second network device move independently, or the first satellite corresponding to the first cell and the second satellite corresponding to the second cell move independently. The network side can pre-estimate the association relationship between the PDD information and the time-domain resources for the second network device to send SSB in the second cell based on the movement trajectory of the satellite. After the terminal device reports the PDD information to the first network device, the first network device can determine the effective time-domain configuration information based on the PDD information and instruct the terminal device. So that the terminal device can receive the SSB of the second cell based on the instructed time-domain configuration information.

[0171] 3) The third piece of information is used to indicate a first distance, where the first distance is the distance between the terminal device and the reference point corresponding to the first cell. In the earth-moving cell scenario, the position of the first cell changes with the movement of the satellite, and thus the distance between the terminal device and the reference point corresponding to the first cell also changes with the movement of the satellite. The network side can pre-estimate the correlation between the distance between the terminal device and the reference point corresponding to the first cell and the time-domain resource for the second network device to send SSB in the second cell based on the movement trajectory of the satellite. After the terminal device reports the distance information between the terminal device and the reference point corresponding to the first cell to the first network device, the first network device can determine the effective time-domain configuration information based on this distance information and instruct the terminal device. So that the terminal device can receive the SSB of the second cell based on the instructed time-domain configuration information. Additionally, this example can also be applicable to the scenario of a stationary ground cell with the terminal device moving.

[0172] 4) The third piece of information is used to indicate a first distance difference, where the first distance difference is the difference between a first distance and a second distance. The first distance is the distance between the terminal device and the reference point corresponding to the first cell, and the second distance is the distance between the terminal device and the reference point corresponding to the second cell. In the earth-moving cell scenario, the position of the first cell and / or the second cell changes with the movement of the satellite. Then the distance between the terminal device and the reference point corresponding to the first cell may change with the movement of the satellite, and the distance between the terminal device and the reference point corresponding to the second cell may change with the movement of the satellite, and thus the distance difference will change. The network side can pre-estimate the correlation between the distance difference information and the time-domain resource for the second network device to send SSB in the second cell based on the movement trajectory of the satellite. After the terminal device reports the distance difference information to the first network device, the first network device can determine the effective time-domain configuration information based on this distance difference information and instruct the terminal device. So that the terminal device can receive the SSB of the second cell based on the instructed time-domain configuration information. Additionally, this example can also be applicable to the scenario of a stationary ground cell with the terminal device moving.

[0173] 5) The third piece of information is used to indicate the reception information of the terminal device for the SSB sent by the first cell. The reception information can be understood as the information of the optimal reception beam. In the earth-moving cell scenario, the position of the first cell changes with the movement of the satellite, and the optimal beam for the terminal device to receive the SSB of the first cell may change with the movement of the satellite. The network side can pre-estimate the correlation between the optimal reception beam information and the time domain resources of the SSB sent by the second network device in the second cell based on the movement trajectory of the satellite. After the terminal device reports the optimal reception beam information to the first network device, the first network device can determine the effective time domain configuration information based on the optimal reception beam information and indicate it to the terminal device. So that the terminal device can receive the SSB of the second cell based on the indicated time domain configuration information.

[0174] Step 403: The first network device sends the second piece of information to the terminal device on the first cell. Correspondingly, the terminal device receives the second piece of information from the first network device on the first cell. The second piece of information is used to indicate the first identifier, and the first identifier is the identifier corresponding to the first time domain configuration information. The second piece of information is carried in a layer 1 or layer 2 message.

[0175] The first network device can determine the effective first time domain configuration information based on the time information. The first network device can also determine the effective first time domain configuration information from the multiple time domain configuration information indicated by the first information based on the first parameter indicated in the third information, and indicate the effective first time domain configuration information to the terminal device. Determining the effective first time domain configuration information through the first parameter reported by the terminal device has high accuracy.

[0176] The second piece of information can indicate the first identifier, that is, the effective time domain configuration information, by the value of the bit. For example, if the first information indicates 3 time domain configuration information, the second piece of information occupies at least 2 bits. For example, if the first information indicates 5 time domain configuration information, the second piece of information occupies at least 3 bits. Taking the case of occupying 2 bits as an example, 00 indicates the identifier corresponding to the time domain configuration information 1, 01 indicates the identifier corresponding to the time domain configuration information 2, and 10 indicates the identifier corresponding to the time domain configuration information 3. For another example, the second piece of information indicates the first identifier, that is, the effective time domain configuration information, in the form of a bitmap, where the time domain configuration information corresponding to the bit with a value of 1 is the effective time domain configuration information. For example, if the first information indicates 3 time domain configuration information and the bitmap of the second piece of information is 001, it means the identifier corresponding to the time domain configuration information 3.

[0177] The terminal device may send third information to the first network device via an RRC message or an L1 / L2 message, and the first network device may send second information to the terminal device via an L1 / L2 message. For example, the second information is carried in a downlink physical control channel or carried by a control unit of the MAC layer. For example, in Figure 2e In the scenario of CU and DU separation as shown, the third information may be sent to the CU in the first network device. After parsing the third information, the CU determines the effective time domain configuration information and notifies the DU of the identifier of the effective time domain configuration information. The CU sends the second information to the terminal device. For another example, in Figure 2e In the scenario of CU and DU separation as shown, the second information may be sent to the DU in the first network device. The CU in the first network device sends the first information to the DU in the first network device. The DU in the first network device determines the second information according to the first information and sends the second information to the terminal device.

[0178] Step 404: The terminal device receives the SSB from the second network device on the second cell based on the first time domain configuration information corresponding to the first identifier.

[0179] The second cell is a neighbor cell of the first cell, and the first network device and the second network device may be the same or different. For example, in the scenario where a secondary cell needs to be added in carrier aggregation, the first network device and the second network device are the same, the first cell is the primary cell of the terminal device, and the second cell is the secondary cell of the terminal device. For example, in the scenario of adding a secondary node, the first network device and the second network device are different, the first network device is the primary node of the terminal device, and the second network device is the secondary node of the terminal device. For another example, in the cell handover scenario, the first network device and the second network device may be the same or different.

[0180] In Figure 2e In the scenario of CU and DU separation as shown, the DU in the network device generates the SSB and sends the SSB.

[0181] Step 404 describes that the terminal device receives the SSB from the second network device on the second cell based on the first time domain configuration information. The terminal device can continuously search for the SSB within the time window configured by the first time domain configuration information. In a possible implementation, the first network device indicates the SSB (SSB-to-measure) that needs to be measured based on the first time domain configuration information to the terminal device. The terminal device can search for these SSBs that need to be measured within the time window configured by the first time domain configuration information, and does not need to search for the SSBs that do not need to be measured, which can save the power consumption of the terminal device. This example is usually for the moving cell scenario. Exemplarily, the first network device sends the fifth information to the terminal device on the first cell. Correspondingly, the terminal device receives the fifth information from the first network device on the first cell. The fifth information is used to indicate the SSB that needs to be measured corresponding to the first time domain configuration information. Then, the terminal device receives the SSB that needs to be measured corresponding to the first time domain configuration information from the second network device on the second cell based on the first time domain configuration information.

[0182] The second network device periodically sends the SSB on the second cell. The fifth information can indicate the index of the SSB to be measured in one period. In one example, the fifth information can indicate the SSB to be measured through the form of a bitmap. The bit positions with a value of 1 represent the indexes of the SSBs to be measured, and the bit positions with a value of 0 represent the indexes of the SSBs that do not need to be measured. For example, 00110000 indicates that the SSBs with indexes 2 and 3 need to be measured.

[0183] The SSB to be measured is associated with the time domain configuration information. When the time domain configuration information becomes effective, the SSB to be measured also becomes effective. Alternatively, an independent effective condition is configured for the SSB to be measured, and when the independent effective condition is met, the SSB to be measured will become effective.

[0184] The corresponding relationship between the SSB to be measured and the time domain configuration information may be one of the following possibilities: One possibility is that the SSBs to be measured corresponding to all time domain configuration information are the same. Another possibility is that the SSBs to be measured corresponding to some time domain configuration information are the same. For example, among 3 time domain configuration information, the SSBs to be measured corresponding to 2 of them are the same, and the SSB to be measured corresponding to the other time domain configuration information is different or completely different from the other 2. Another possibility is that the SSBs to be measured corresponding to all time domain configuration information are partially different or completely different.

[0185] Generally, the time domain configuration information is sent to the terminal device through RRC signaling / high layer signaling, and the identifier of the effective time domain configuration information is sent to the terminal device through layer 1 or layer 2 messages. For the terminal device and the network device, the processing load of processing RRC signaling is larger than that of processing layer 1 or layer 2 messages. Therefore, when the network device configures multiple time domain configuration information for the terminal device at one time compared with the network device configuring multiple time domain configuration information for the terminal device multiple times, the signaling interaction between the network device and the terminal device can be saved, and the processing load of the terminal device and the network device can be reduced.

[0186] Embodiment 3:

[0187] The network device configures multiple reference signal sets and the corresponding activation conditions for each reference signal set for the terminal device at one time. The terminal device can determine whether any of the activation conditions are met. When the terminal device determines that any of the activation conditions are met, the terminal device uses the reference signal set corresponding to the activation condition for wireless link monitoring and / or wireless link recovery, and the network device does not need to frequently configure reference signal sets for the terminal device.

[0188] Figure 5 The flowchart of a communication method provided by an embodiment of the present application is shown, including the following steps:

[0189] Step 501: The network device sends the first information. Correspondingly, the terminal device receives the first information; the first information is used to indicate multiple reference signal sets and multiple activation conditions, and the multiple reference signal sets and the multiple activation conditions correspond one by one.

[0190] When the network device sends a reference signal to the terminal device, it is sent in the form of a beam. For the multiple reference signals in the reference signal set, generally different reference signals are sent through different beams. The reference signals in different reference signal sets are partially different or completely different.

[0191] The first information may be carried in an RRC message / signaling. For example, it is carried in an RRCReconfiguration message / signaling.

[0192] The reference signal may be a CSI-RS or an SSB.

[0193] In Figure 2e In the scenario of CU and DU separation shown, the DU in the network device generates the first information. Sending the first information from the network device to the terminal device in step 501 can be replaced by the DU in the network device generating the first information, the DU in the network device sending the first information to the CU in the network device, and then the CU in the network device sending the first information to the terminal device. For example, the first information is carried in the RRC signaling.

[0194] Step 502: When the terminal device determines that the first activation condition is met, it performs wireless link monitoring and / or wireless link recovery based on the first reference signal set corresponding to the first activation condition.

[0195] The first activation condition belongs to the multiple activation conditions, and the first reference signal set belongs to the multiple reference signal sets.

[0196] The relevant content of performing wireless link monitoring and / or wireless link recovery based on the reference signals in the reference signal set can be introduced above, and will not be repeated here. In Figure 2e In the scenario of CU and DU separation shown, the DU in the network device generates reference signals and sends the reference signals.

[0197] The following introduces the activation conditions corresponding to the time domain configuration information:

[0198] Any of the activation conditions includes one or more of the following. It can be understood that the following serial numbers 1), 2), and 3) are only for convenience of description, and this serial number does not represent the importance and priority of the content corresponding to this serial number:

[0199] 1) Distance condition: The distance is the distance between the terminal device and the reference point corresponding to the serving cell. This reference point is, for example, the center point of the coverage range of the serving cell.

[0200] The distance condition can be understood as a distance range. For example, the first information indicates reference signal set 1 and reference signal set 2, and indicates that the distance condition in the activation condition of reference signal set 1 is less than or equal to d1 or within the distance range D1, and the PDD condition in the activation condition of reference signal set 2 is greater than d1 or within the distance range D2. The terminal device determines the first distance. In the case where there are no other conditions except the distance condition in the activation condition, when the first distance is less than or equal to d1 or within the distance range D1, it is determined that reference signal set 1 is activated; when the first distance is greater than d1 or within the distance range D2, it is determined that reference signal set 2 is activated.

[0201] In the earth - moving cell scenario, the position of the serving cell changes with the movement of the satellite, and then the distance between the terminal device and the reference point corresponding to the serving cell also changes with the movement of the satellite. The network side can pre - estimate the association relationship between the distance between the terminal device and the reference point corresponding to the serving cell and the beam of the reference signal based on the movement trajectory of the satellite. Furthermore, the network side can determine the association relationship between different reference signal sets and distance conditions and indicate it to the terminal device. So that the terminal device performs wireless link detection and / or wireless link recovery based on the reference signal set corresponding to the satisfied distance condition.

[0202] In addition, this condition can also be applicable to the scenario where the cell is stationary on the ground and the terminal device is moving.

[0203] 2) Regional location condition. The regional location is the regional location where the terminal device is located. For example, the first piece of information indicates reference signal set 1 and reference signal set 2, and indicates that the regional location condition in the activation condition of reference signal set 1 is regional location 1, and the regional location condition in the activation condition of reference signal set 2 is regional location 2. When there are no other conditions in the activation condition except the regional location condition, when the terminal device determines that it is in regional location 1, it determines that reference signal set 1 is activated; when the terminal device determines that it is in regional location 2, it determines that reference signal set 2 is activated.

[0204] When the network device is moving, the network side can pre-estimate the association relationship between the regional location of the terminal device and the beam of the reference signal based on the movement trajectory of the satellite. Furthermore, the network side can determine the association relationship between different reference signal sets and regional location conditions, and indicate it to the terminal device. So that the terminal device can perform wireless link detection and / or wireless link recovery based on the reference signal set corresponding to the satisfied regional location condition. When determining the activated reference signal set based on the regional location of the terminal device, the position of the satellite can also be referred to.

[0205] 3) Time condition. The time condition can be understood as a time range or a certain time point. For example, the first piece of information indicates reference signal sets 1, 2, and 3. The first piece of information indicates that the time condition in the activation condition corresponding to reference signal set 1 is time point t1 or time period t1 to t2, the time condition in the activation condition corresponding to reference signal set 2 is time point t2 or time period t2 to t3, and the time condition in the activation condition corresponding to reference signal set 3 is time point t3 or time period t3 to t4. When there are no other conditions in the activation condition except the time difference condition, the terminal device determines that reference signal set 1 is activated at time point t1, waits until time point t2 to determine that reference signal set 2 is activated, and waits until time point t3 to determine that reference signal set 3 is activated.

[0206] The network side can pre-estimate the association relationship between the time information and the beam associated with the reference signal based on the movement trajectory of the satellite. Furthermore, the network side can determine the association relationship between different reference signal sets and time conditions, and indicate it to the terminal device. So that the terminal device can perform wireless link detection and / or wireless link recovery based on the reference signal set corresponding to the satisfied time condition.

[0207] 5) The reception condition for the SSB sent by the network device.

[0208] The receiving condition can be understood as the optimal receiving beam condition. For example, the first piece of information indicates reference signal set 1 and reference signal set 2, and indicates that the optimal receiving beam in the effective condition corresponding to reference signal set 1 is beam 1, and the optimal receiving beam in the effective condition corresponding to reference signal set 2 is beam 2. When the effective condition does not include other conditions except the receiving condition, when the terminal device determines that the optimal receiving beam for receiving the SSB from the network device on the first cell is beam 1, reference signal set 1 becomes effective; when the terminal device determines that the optimal receiving beam for receiving the SSB from the network device on the first cell is beam 2, reference signal set 2 becomes effective.

[0209] In the scenario of an earth - moving cell, the position of the first cell changes with the movement of the satellite. Then the optimal beam for the terminal device to receive the SSB of the first cell may change with the movement of the satellite. The network side can pre - estimate the association relationship between the optimal receiving beam and the transmitting beam of the reference signal based on the satellite's movement trajectory. Furthermore, the network side can determine the association relationship between different reference signal sets and receiving beam conditions and indicate it to the terminal device. So that the terminal device can perform wireless link detection and / or wireless link recovery based on the reference signal set corresponding to the satisfied receiving beam condition.

[0210] In a possible implementation, the terminal device informs the network device of the effective reference signal set. For example, when the first effective condition is met, the terminal device sends the second piece of information to the network device. Correspondingly, the network device receives the second piece of information, and the second piece of information is used to indicate the first reference signal set. The second piece of information indicates the first identifier of the first reference signal set. For example, in step 501, the first piece of information also indicates the identifiers corresponding to each of the multiple reference signal sets, then the second piece of information can indicate the identifier of the effective reference signal set, and the identifier is, for example, an index. Or the second piece of information can indicate the satisfied effective condition. For example, for the distance condition, the second piece of information can indicate the distance between the terminal device and the reference point corresponding to the serving cell. For the regional location condition, the second piece of information can indicate the regional location where the terminal device is located. For the receiving condition of the SSB, the second piece of information can indicate the optimal receiving beam of the terminal device. The terminal device informing the network device of the effective reference signal set can enable the network device to know which reference signals need to be sent currently for the terminal device to measure.

[0211] The second piece of information can be sent to the network device through an RRC message. In Figure 2eIn the scenario of CU and DU separation as shown, the second information can be sent to the CU in the network device through an RRC message. After the CU parses the second information, it notifies the DU of the specific content of the effective reference signal set. Based on the specific content of the effective reference signal set, the DU knows which reference signals need to be sent to the terminal device.

[0212] The second information can be sent to the network device through an L1 / L2 message. In Figure 2e In the scenario of CU and DU separation as shown, the second information can be sent to the DU in the network device through an L1 / L2 message. After the DU parses the second information, based on the specific content of the effective reference signal set, the DU knows which reference signals need to be sent to the terminal device. For example, the second information indicates the identifier of the effective reference signal set, and the CU has previously informed the DU of multiple reference signal sets and their corresponding identifiers. The DU can find the corresponding effective reference signal set based on the identifier indicated by the second information.

[0213] Step 502 above introduced that when the terminal device determines that the first activation condition is met, it performs wireless link monitoring and / or wireless link recovery based on the first reference signal set corresponding to the first activation condition. In one example, in the scenario where the terminal device sends the second information to the network device, the terminal device does not need to consider the order of wireless link monitoring and / or wireless link recovery based on the first reference signal set and sending the second information. In another example, after the terminal device determines that the first activation condition is met and the terminal device successfully sends the second information, it performs wireless link monitoring and / or wireless link recovery based on the first reference signal set corresponding to the first activation condition.

[0214] In addition, even if the terminal device does not inform the network device of the effective reference signal set, the network device can infer the effective reference signal set at different times or different time periods, and the network device knows which reference signals need to be sent to the terminal device according to the effective reference signal set.

[0215] Embodiment 4:

[0216] The network device configures multiple reference signal sets and their respective corresponding identifiers for the terminal device at one time. The network device then determines the effective reference signal set from the configured multiple reference signal sets and indicates the identifier corresponding to the effective reference signal set to the terminal device. The terminal device uses the reference signal set corresponding to the identifier indicated by the network device for wireless link monitoring and / or wireless link recovery.

[0217] Figure 6 The figure shows a schematic flowchart of a communication method provided by an embodiment of the present application, including the following steps:

[0218] Step 601: The network device sends the first information. Correspondingly, the terminal device receives the first information. The first information is used to indicate multiple reference signal sets and multiple identifiers, and the multiple reference signal sets and the multiple identifiers are in one-to-one correspondence.

[0219] When the network device sends reference signals to the terminal device, it sends them in the form of beams. For the multiple reference signals in a reference signal set, generally different beams are used to send different reference signals. The reference signals in different reference signal sets are partially different or completely different. The reference signal can be CSI-RS or SSB. The first information can be carried in an RRC message / signal, for example, carried in an RRCReconfiguration message / signal.

[0220] In Figure 2e In the scenario of CU and DU separation as shown, the DU in the network device generates the first information. The step of the network device sending the first information to the terminal device in Step 601 can be replaced by the DU of the network device generating the first information, the DU of the network device sending the first information to the CU of the network device, and then the CU of the network device sending the first information to the terminal device.

[0221] Optionally, Step 602: The terminal device sends the third information. Correspondingly, the network device receives the third information. The third information is used to indicate a first parameter, and the first parameter is used to determine a first reference signal set from multiple reference signal sets.

[0222] The second information is used to indicate the first parameter, including one or more of the following. It can be understood that the following serial numbers 1), 2),... 5), etc. are only for convenience of description, and this serial number does not represent the importance and priority of the content corresponding to this serial number:

[0223] 1) The second information is used to indicate a first distance, and the first distance is the distance between the terminal device and the reference point corresponding to the serving cell. The reference point is, for example, the center point of the coverage area of the serving cell. In the earth-moving cell scenario, the position of the serving cell changes with the movement of the satellite, and then the distance between the terminal device and the reference point corresponding to the serving cell also changes with the movement of the satellite. The network side can pre-estimate the correlation between the distance between the terminal device and the reference point corresponding to the serving cell and the beam of the reference signal based on the movement trajectory of the satellite. Furthermore, the network side can determine the correlation between different reference signal sets and distance conditions and indicate it to the terminal device. So that the terminal device can perform wireless link detection and / or wireless link recovery based on the reference signal set corresponding to the satisfied distance condition.

[0224] In addition, this condition can also be applied to the scenario where the terminal device moves in a ground stationary cell.

[0225] 2) The second piece of information is used to indicate the first regional location where the terminal device is located. When the network device moves, the network side can pre-estimate the association relationship between the regional location of the terminal device and the beam of the reference signal based on the movement trajectory of the satellite. Furthermore, the network side can determine the association relationship between different reference signal sets and regional location conditions and indicate it to the terminal device. So that the terminal device can perform wireless link detection and / or wireless link recovery based on the reference signal set corresponding to the satisfied regional location condition. When determining the effective reference signal set based on the regional location of the terminal device, the movement of the satellite can also be referred to.

[0226] 3) The second piece of information is used to indicate the reception information of the SSB sent by the network device to the terminal device. The reception information can be understood as the optimal reception beam information. In the scenario of an earth-moving cell, the position of the first cell changes with the movement of the satellite, and then the optimal beam for the terminal device to receive the SSB of the first cell may change with the movement of the satellite. The network side can pre-estimate the association relationship between the optimal reception beam and the transmission beam of the reference signal based on the movement trajectory of the satellite. Furthermore, the network side can determine the association relationship between different reference signal sets and reception beam conditions and indicate it to the terminal device. So that the terminal device can perform wireless link detection and / or wireless link recovery based on the reference signal set corresponding to the satisfied reception beam condition.

[0227] Step 603: The network device sends the second piece of information to the terminal device. Correspondingly, the terminal device receives the second piece of information. The second piece of information is used to indicate the first identifier, and the first identifier is the identifier of the first reference signal set. The first identifier belongs to the multiple identifiers, and the first reference signal set belongs to the multiple reference signal sets. The second piece of information is carried in a layer 1 or layer 2 message.

[0228] The network device can determine the effective first reference signal set based on the time information. The network device can also determine the effective first reference signal set from the multiple reference signal sets indicated in the first information based on the first parameter indicated in the third information and indicate the effective first reference signal set to the terminal device. Determining the effective first reference signal set through the first parameter reported by the terminal device has high accuracy.

[0229] The second information can indicate the first identifier through the value of bits, that is, the set of valid reference signals. For example, if the first information indicates 3 sets of reference signals, the second information occupies at least 2 bits. For example, if the first information indicates 5 sets of reference signals, the second information occupies at least 3 bits. Taking the case of occupying 2 bits as an example, 00 represents the identifier corresponding to reference signal set 1, 01 represents the identifier corresponding to reference signal set 2, and 10 represents the identifier corresponding to reference signal set 3. For another example, the second information indicates the first identifier, that is, the set of valid reference signals, in the form of a bitmap, where the reference signal sets corresponding to the bits with a value of 1 are the valid reference signal sets. For example, if the first information indicates 3 sets of reference signals and the bitmap of the second information is 001, it represents the identifier corresponding to reference signal set 3.

[0230] The terminal device can send the third information to the network device through RRC messages or L1 / L2 messages, and the network device can send the second information to the terminal device through L1 / L2 messages. For example, the second information is carried in the downlink physical channel or carried by the control unit of the MAC layer. For example, in Figure 2e In the scenario of CU and DU separation as shown, the third information can be sent to the CU in the network device. After the CU analyzes the third information, it determines the set of valid reference signals and informs the identifier of the set of valid reference signals to the CU, and the CU sends the second information to the terminal device. For another example, in Figure 2e In the scenario of CU and DU separation as shown, the second information can be sent to the DU in the network device. The CU in the network device sends the first information to the DU in the network device, and the DU in the network device determines the second information according to the first information and sends the second information to the terminal device.

[0231] Step 604: The terminal device performs wireless link monitoring and / or wireless link recovery based on the first set of reference signals corresponding to the first identifier.

[0232] The relevant content of performing wireless link monitoring and / or wireless link recovery based on the reference signals in the set of reference signals can be introduced above and will not be repeated here. In Figure 2e In the scenario of CU and DU separation as shown, the DU in the network device generates reference signals and sends the reference signals.

[0233] Generally, a set of reference signals is configured for a terminal device through RRC signaling / high-layer signaling, and the identifier of the effective set of reference signals is sent to the terminal device through a layer 1 or layer 2 message. For the terminal device and the network device, the processing load of processing RRC signaling is larger than that of processing layer 1 or layer 2 messages. Therefore, configuring multiple sets of reference signals for the terminal device at one time by the network device can save the signaling interaction between the network device and the terminal device compared with the network device configuring multiple sets of reference signals for the terminal device multiple times, and can reduce the processing load of the terminal device and the network device.

[0234] It can be understood that, in order to implement the functions in the above embodiments, the terminal device and the network device include corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should easily realize that, combining the units and method steps of each example described in the embodiments disclosed in the present application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application scenario and design constraint effective conditions of the technical solution.

[0235] Figure 7 and Figure 8 FIG. is a schematic structural diagram of a possible communication device provided by an embodiment of the present application. These communication devices can be used to implement the functions of the terminal device and the network device in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments. In the embodiments of the present application, the communication device can be, for example, Figure 2a , Figure 2b , Figure 2c and Figure 2d shown terminal devices, or can be, for example, Figure 2a , Figure 2b , Figure 2c and Figure 2d shown access network devices, or can also be a module (such as a chip) applied to the terminal device or the network device.

[0236] As Figure 7 shown, the communication device 700 includes a processing unit 710 and a transceiver unit 720.

[0237] For example, the communication device 700 is used to implement the functions of the terminal device or the first network device in the above Figure 3 , Figure 4 , Figure 5 and Figure 6 shown method embodiments, where the transceiver unit 720 can perform the receiving and sending actions executed by the terminal device or the first network device in the above method embodiments, and the processing unit 710 can perform other actions except the sending and receiving actions executed by the terminal device or the first network device in the above method embodiments.

[0238] Exemplarily, when the communication device 700 is used to implement Figure 3 the functions of the terminal device in the method embodiments shown, the transceiver unit 720 is used to receive first information on a first cell and receive an SSB on a second cell. The processing unit 710 is used to parse the first information.

[0239] Exemplarily, when the communication device 700 is used to implement Figure 3 the functions of the first network device in the method embodiments shown, the transceiver unit 720 is used to receive sending the first information to the terminal device on a first cell and sending the SSB to the terminal device on a second cell. The processing unit 710 is used to generate the first information.

[0240] For a more detailed description of the above processing unit 710 and transceiver unit 720, reference can be directly made to Figure 3 , Figure 4 , Figure 5 and Figure 6 the relevant descriptions in the method embodiments shown, which will not be elaborated here. The processing unit 710 can be implemented by a processor, and the transceiver unit 720 can be implemented by a transceiver.

[0241] As Figure 8 shown, the communication device 800 includes a processor 810 and an interface circuit 820. The processor 810 and the interface circuit 820 are coupled to each other. It can be understood that the interface circuit 820 can be a transceiver or an input / output interface. Optionally, the communication device 800 may further include a memory 830 for storing instructions executed by the processor 810 or storing input data required for the processor 810 to run instructions or storing data generated after the processor 810 runs instructions. Sometimes, the interface circuit 820 can also be understood as a part of the processor 810, and in this case, the communication device 800 includes the processor 810.

[0242] When the communication device 800 is used to implement the above Figure 3 , Figure 4 , Figure 5 and Figure 6 shown methods, the processor 810 is used to implement the functions of the above processing unit 710, and the interface circuit 820 is used to implement the functions of the above transceiver unit 720.

[0243] When the above communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiments. The terminal device chip receives information from a network device, which can be understood as the information is first received by other modules (such as a radio frequency module or an antenna) in the terminal device and then sent by these modules to the terminal device chip. The terminal device chip sends information to the network device, which can be understood as the information is first sent to other modules (such as a radio frequency module or an antenna) in the terminal device and then sent by these modules to the network device.

[0244] When the above communication device is a chip applied to a network device, the network device chip implements the functions of the network device in the above method embodiments. The network device chip receives information from a terminal device, which can be understood as the information is first received by other modules (such as a radio frequency module or an antenna) in the network device and then sent by these modules to the network device chip. The network device chip sends information to the terminal device, which can be understood as the information is sent to other modules (such as a radio frequency module or an antenna) in the network device and then sent by these modules to the terminal device. Here, the network device module can be the baseband chip of the network device, or a DU or other module. Here, the DU can be a DU under the open radio access network O-RAN architecture.

[0245] In this application, when entity A sends information to entity B, it can be that A directly sends to B, or A indirectly sends to B through other entities. Similarly, when entity B receives information from entity A, it can be that entity B directly receives the information sent by entity A, or entity B indirectly receives the information sent by entity A through other entities. Here, entity A and B can be network devices or terminal devices, or modules inside network devices or terminal devices. The sending and receiving of information can be information interaction between a network device and a terminal device, or information interaction between two network devices, such as the information interaction between a CU and a DU; the sending and receiving of information can also be information interaction between different modules within a device, for example, the information interaction between a terminal device chip and other modules of the terminal device, or the information interaction between a network device chip and other modules in the network device.

[0246] It can be understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0247] Embodiments of the present application also provide a computer-readable storage medium storing a computer program, which when executed by a computer, can cause the computer to execute the above communication method. Or rather: the computer program includes instructions for implementing the above communication.

[0248] Embodiments of the present application also provide a computer program product, including: computer program code, which when running on a computer, enables the computer to execute the above-provided communication method.

[0249] Embodiments of the present application also provide a communication system, which includes: a network device and a terminal device that execute the above communication method.

[0250] The method steps in the embodiments of the present application can be implemented in a hardware manner or by a processor executing software instructions. The software instructions may be composed of corresponding software modules, and the software modules may be stored in a random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, removable hard disk, compact disc read-only memory (CD-ROM) (also known as a read-only optical disc), or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may be located in an ASIC. Additionally, the ASIC may be located in a base station or a terminal. Of course, the processor and the storage medium may also exist as discrete components in a base station or a terminal

[0251] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a first control plane network element, a user equipment, or other programmable devices. The computer program or instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrating one or more available media. The available medium can be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0252] In various embodiments of the present application, if there is no special description and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be cross-referenced, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0253] In the embodiments of the present application, for the number of nouns, unless otherwise specified, it means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A or B can be singular or plural. The character " / " generally means that the associated objects before and after are in an "or" relationship. For example, A / B means: A or B. Expressions such as "at least one of the following" or "one or more of them" refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c, or one or more of a, b, or c means: a, b, c, a and b, a and c, b and c, or a, b, and c. Each of a, b, and c can be single or multiple.

[0254] In the embodiments of the present application, ordinal numbers such as "first" and "second" are used to distinguish multiple objects, and are not used to limit the size, content, order, time sequence, priority, or importance, etc. of multiple objects. Moreover, such names do not indicate differences in the content included in these two pieces of information, the sender / receiver, the sending order, size, application scenario, priority, or importance, etc. In addition, the numbering of steps in each of the embodiments described in the present application is only for distinguishing different steps and does not limit the sequence of steps.

Claims

1. A communication method, characterized in that, Applied to a terminal device, including: Receiving first information from a first network device on a first cell; wherein, the first information is used to indicate a plurality of time domain configuration information and a plurality of activation conditions, and the plurality of time domain configuration information and the plurality of activation conditions correspond one by one; the first cell is the serving cell of the terminal device; When a first activation condition is satisfied, receiving a synchronization signal and a physical broadcast channel block SSB from a second network device on a second cell based on first time domain configuration information corresponding to the first activation condition; wherein, the second cell is a neighboring cell of the first cell, the first network device and the second network device are the same or different, the first activation condition belongs to the plurality of activation conditions, and the first time domain configuration information belongs to the plurality of time domain configuration information.

2. The method according to claim 1, characterized in that Any one of the activation conditions includes one or more of the following: Propagation delay difference PDD condition, distance condition, distance difference condition, time condition, reception condition for the SSB sent by the first network device on the first cell; The PDD is the difference between a first transmission delay and a second transmission delay, and the first transmission delay is the transmission delay between the terminal device and the first network device; wherein, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different; or, the first transmission delay is the transmission delay between the terminal device and a first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and a second satellite corresponding to the second cell, the first network device and the second network device are the same or different, and the first satellite and the second satellite are different; The distance is the distance between the terminal device and a reference point corresponding to the first cell; The distance difference is the difference between a first distance and a second distance, the first distance is the distance between the terminal device and a reference point corresponding to the first cell, and the second distance is the distance between the terminal device and a reference point corresponding to the second cell.

3. The method according to claim 1 or 2, characterized in that Further including: Receiving second information from the first network device on the first cell, and the second information is used to indicate the SSB that needs to be measured corresponding to each of the plurality of time domain configuration information; The receiving the SSB from the second network device on the second cell based on the first time domain configuration information corresponding to the first activation condition includes: Receiving the SSB that needs to be measured corresponding to the first time domain configuration information from the second network device on the second cell based on the first time domain configuration information corresponding to the first activation condition.

4. The method according to any one of claims 1 to 3, characterized in that, Further including: Sending third information to the first network device on the first cell, and the third information is used to indicate the first time domain configuration information.

5. A communication method, characterized in that, Applied to a first network device, including: Generating first information; Send the first information to the terminal device on the first cell; wherein, the first information is used to indicate a plurality of time domain configuration information and a plurality of activation conditions, the plurality of time domain configuration information and the plurality of activation conditions correspond one by one, and the first information is used to when any activation condition is met, the terminal device receives a synchronization signal and a physical broadcast channel block SSB from a second network device on the second cell based on any time domain configuration information corresponding to the any activation condition, the first cell is the serving cell of the terminal device, the second cell is a neighbor cell of the first cell, and the first network device and the second network device are the same or different.

6. The method according to claim 5, wherein Any one of the activation conditions includes one or more of the following: Propagation delay difference PDD condition, distance condition, distance difference condition, time condition, reception condition for the SSB sent by the first network device on the first cell; The PDD is the difference between a first transmission delay and a second transmission delay; wherein, the first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different; or, the first transmission delay is the transmission delay between the terminal device and the first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and the second satellite corresponding to the second cell, the first network device and the second network device are the same or different, and the first satellite and the second satellite are different; The distance is the distance between the terminal device and a reference point corresponding to the first cell; The distance difference is the difference between a first distance and a second distance, the first distance is the distance between the terminal device and a reference point corresponding to the first cell, and the second distance is the distance between the terminal device and a reference point corresponding to the second cell.

7. The method according to claim 5 or 6, characterized in that, Further includes: Send the second information to the terminal device on the first cell, the second information is used to indicate the SSB to be measured corresponding to each of the plurality of time domain configuration information; The second information is used to when any activation condition is met, the terminal device receives the SSB to be measured corresponding to the any time domain configuration information sent by the second network device on the second cell based on any time domain configuration information corresponding to the any activation condition.

8. The method according to any one of claims 5 to 7, characterized in that Further includes: Receive third information from the terminal device on the first cell, the third information is used to indicate the time domain configuration information that meets the activation condition; Schedule the terminal device based on the time domain configuration information that meets the activation condition.

9. A communication method, characterized in that, Applied to a terminal device, includes: Receive first information from a first network device on a first cell, the first information is used to indicate a plurality of time domain configuration information and a plurality of identifiers, the plurality of time domain configuration information and the plurality of identifiers correspond one by one, and any one of the time domain configuration information is used for the terminal device to receive a synchronization signal and a physical broadcast channel block SSB; Receive second information from the first network device on the first cell, where the second information is used to indicate a first identifier, the first identifier is used to indicate first time domain configuration information, the first identifier belongs to the multiple identifiers, the first time domain configuration information belongs to the multiple time domain configuration information, and the second information is carried in a layer 1 or layer 2 message; Receive an SSB from a second network device on a second cell based on the first time domain configuration information, where the second cell is a neighbor cell of the first cell, and the first network device and the second network device are the same or different.

10. The method according to claim 9, characterized in that, Further include: Send third information to the first network device on the first cell, where the third information is used to indicate a first parameter, and the first parameter is used to determine the first time domain configuration information from the multiple time domain configuration information.

11. The method according to claim 10, wherein The first parameter specifically includes one or more of the following: A first PDD, where the first PDD is the difference between a first transmission delay and a second transmission delay, the first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different; or, the first transmission delay is the transmission delay between the terminal device and a first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and a second satellite corresponding to the second cell, the first network device and the second network device are the same or different, and the first satellite and the second satellite are different; A first distance, where the first distance is the distance between the terminal device and a reference point corresponding to the first cell; A first distance difference, where the first distance difference is the difference between a first distance and a second distance, the first distance is the distance between the terminal device and a reference point corresponding to the first cell, and the second distance is the distance between the terminal device and a reference point corresponding to the second cell; The receiving information of the terminal device for the SSB sent by the first cell.

12. The method according to any one of claims 9-11, characterized in that, Further include: Receive fourth information from the first network device on the first cell, where the fourth information is used to indicate the SSBs that need to be measured corresponding to the first time domain configuration information; The receiving the SSB from the second network device on the second cell based on the first time domain configuration information includes: Receiving, on the second cell, the SSB that needs to be measured corresponding to the first time domain configuration information from the second network device based on the first time domain configuration information.

13. A communication method, characterized in that, Applied to a first network device, including: Send the first information to the terminal device on the first cell, where the first information is used to indicate multiple time domain configuration information and multiple identifiers, and the multiple time domain configuration information and the multiple identifiers correspond one by one; send the second information to the terminal device on the first cell, where the second information is used to indicate a first identifier, the first identifier is used to indicate first time domain configuration information, the first identifier belongs to the multiple identifiers, and the first time domain configuration information belongs to the multiple time domain configuration information; the first time domain configuration information is used for the terminal device to receive a synchronization signal and a physical broadcast channel block SSB sent by a second network device in a second cell, the second cell is a neighboring cell of the first cell, the first network device and the second network device are the same or different, and the second information is carried in a layer 1 or layer 2 message.

14. The method according to claim 13, characterized in that, Further included: Receive third information from the terminal device on the first cell, where the third information is used to indicate a first parameter, and the first parameter is used to determine the first time domain configuration information from the multiple time domain configuration information.

15. The method according to claim 14, wherein The first parameter specifically includes one or more of the following: A first PDD, where the first PDD is the difference between a first transmission delay and a second transmission delay, the first transmission delay is the transmission delay between the terminal device and the first network device, the second transmission delay is the transmission delay between the terminal device and the second network device, and the first network device and the second network device are different; or, the first transmission delay is the transmission delay between the terminal device and a first satellite corresponding to the first cell, the second transmission delay is the transmission delay between the terminal device and a second satellite corresponding to the second cell, the first network device and the second network device are the same or different, and the first satellite and the second satellite are different; A first distance, where the first distance is the distance between the terminal device and a reference point corresponding to the first cell; A first distance difference, where the first distance difference is the difference between a first distance and a second distance, the first distance is the distance between the terminal device and a reference point corresponding to the first cell, and the second distance is the distance between the terminal device and a reference point corresponding to the second cell; The receiving information of the terminal device for the SSB sent by the first cell.

16. The method according to any one of claims 13-15, characterized in that, Further included: Send fourth information to the terminal device on the first cell, where the fourth information is used to indicate the SSB to be measured corresponding to the first time domain configuration information; The fourth information is used for the terminal device to receive the SSB to be measured corresponding to the first time domain configuration information sent by the second network device on the second cell based on the first time domain configuration information.

17. A communication device, characterized in that, Includes a module for executing the method according to any one of claims 1-16.

18. A communication device, characterized in that, Includes a processor, and the processor is coupled to a memory; The memory is used to store computer programs or instructions; The processor is configured to execute some or all of the computer programs or instructions in the memory, and when the some or all of the computer programs or instructions are executed, to implement the method according to any one of claims 1-16.

19. A communication device, characterized in that, comprising a processor and a memory; The memory is configured to store computer programs or instructions; The processor is configured to execute some or all of the computer programs or instructions in the memory, and when the some or all of the computer programs or instructions are executed, to implement the method according to any one of claims 1-16.

20. A communication device, characterized in that, comprising a processor and an interface circuit, the interface circuit being configured to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor being configured to implement the method according to any one of claims 1-16 through logic circuits or by executing code instructions.

21. A computer-readable storage medium, characterized in that, A computer program or instructions are stored in the storage medium, and when the computer program or instructions are executed by the communication device, the method according to any one of claims 1-16 is implemented.

22. A computer program product, characterized in that, The computer program product includes: computer instructions, and when the computer instructions are run on a computer, the method according to any one of claims 1-16 is implemented.

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