CN119521317A

CN119521317A - Communication method and communication equipment

Info

Publication number: CN119521317A
Application number: CN202311061499.2A
Authority: CN
Inventors: 王刚; 杨志武; 叶朝岭
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2025-02-25

Abstract

The present application provides a communication method and a communication device, the method comprising: when a terminal device determines that the signal quality of a current serving cell is less than or equal to a first threshold, and the distance between the current position of the terminal device and the center position of the serving cell is greater than a first distance, a cell search can be immediately triggered or an RRC connection re-establishment can be immediately triggered, wherein the current serving cell is an NTN cell, so that the resident cell can be determined more quickly, the time of signal loss can be reduced, and the user's service experience can be guaranteed.

Description

Communication method and communication equipment

Technical Field

The present application relates to the field of communications, and more particularly, to a communication method and a communication apparatus.

Background

The low orbit satellite communication technology developed at present enables satellite communication to gradually enter the life of ordinary people, and is similar to a ground base station cell. Since the satellites are low-orbit satellites, not stationary orbit satellites, the relative earth position of the satellites is constantly moving, and it is also understood that the coverage of satellite cells is constantly changing. However, when the satellite flies around the earth at high altitudes, the signal strength changes are not obvious at the cell edge and cell center point, and thus the terminal device is insensitive to triggering neighbor cell measurements.

To solve the above problem, the concept of "distance threshold (distance threshold)" is currently introduced. In idle state, if the terminal equipment moves within the distance threshold, the terminal equipment can not start measuring neighbor cells at the moment, and if the terminal equipment moves outside the distance threshold, the terminal equipment needs to start measuring neighbor cells. In the connected state, distance-related measurements and reporting are also increased. Although a distance threshold is introduced to solve the problem that the terminal equipment triggers neighbor cell measurement, if the network equipment does not configure a proper neighbor cell for the terminal equipment or the configured measurement condition is not proper, at this time, even if the signal quality of the current service cell of the terminal equipment is not good and the measurement condition for triggering the neighbor cell is met, the terminal equipment cannot measure the signal quality of the neighbor cell, under the scene, the terminal equipment cannot timely measure the neighbor cell, and therefore cannot reselect the cell, thereby causing longer signal interruption time and poorer service experience of users. Similarly, in the connected state, if the network device does not trigger handover, the terminal device itself does not trigger radio resource control (radio resource control, RRC) connection reestablishment, signal interruption may also be caused, so as to affect the service experience of the user.

Disclosure of Invention

The application provides a communication method, when the signal quality of the service cell of the terminal equipment is poor, the cell search or the RRC connection reestablishment can be triggered in time by judging the condition, so that the time of signal interruption can be reduced, and the service experience of a user is ensured.

In a first aspect, a communication method is provided, which may be performed by a terminal device, or may also be performed by a component part (e.g., a chip or a circuit) of the terminal device, which is not limited.

The method comprises the steps that terminal equipment resides in a service cell which is a non-ground network NTN cell, and when the signal quality of the service cell is smaller than or equal to a first threshold value and the distance between a first position and the central position of the service cell is larger than or equal to a first distance, the terminal equipment triggers cell search or Radio Resource Control (RRC) connection reestablishment, wherein the first distance is used for representing the distance between the central position of the service cell and the edge position of the service cell, and the first position is the current position of the terminal equipment.

In other scenarios, when the air interface resource is out of step between the terminal device and the NTN during the connection state (for example, synchronization SIGNAL AND PBCH block (SSB) sent by the NTN cannot be received due to poor signal quality of the serving cell), and the terminal device determines that the distance between the first location and the central location of the serving cell is greater than or equal to the first distance, the terminal device triggers the cell radio resource control RRC connection reestablishment.

The terminal device triggers cell re-search when the terminal device is in an idle state, and triggers RRC connection re-establishment when the terminal device is in a connected state, for example.

In the present application, the "signal quality of the serving cell is less than or equal to the first threshold" may be understood as that the signal quality of the serving cell is deteriorated, for example, the signal quality of the serving cell has been deteriorated to affect the service quality of the user. Alternatively, it is also understood that the first threshold is used to determine whether the signal quality of the serving cell is degraded. For example, the signal quality of the serving cell does not meet the S criterion, or the Reference Signal Received Quality (RSRQ) of the serving cell is less than or equal to a certain threshold, or the reference signal received power (REFERENCE SIGNAL RECEIVING power, RSRP) is less than or equal to a certain threshold, or the signal to interference plus noise ratio (signal to interference plus noise ratio, SINR) is less than or equal to a certain threshold. For example, the terminal device may receive a synchronization signal block (synchronization signal block ) from the serving cell, and measure the signal quality of the serving cell to determine whether the signal quality of the current serving cell meets the S criterion. For another example, the terminal device may measure the reference signal to determine whether the RSRP or RSRQ of the current serving cell meets the threshold value.

The "first threshold value" and "threshold value" referred to in the present application may be values that are preconfigured according to actual conditions. For example, if it is determined in a general sense that RSRP is less than a certain value, which represents a degradation of the signal quality of the current serving cell, the "first threshold" or "threshold" herein may be the value.

In the present application, "the terminal device triggers cell search or RRC connection re-establishment" may also be understood as that the terminal device triggers cell search immediately or triggers RRC re-establishment immediately. In other words, in the scheme provided by the application, as long as the terminal equipment judges that the signal quality of the service cell is smaller than or equal to the first threshold value and the distance between the first position and the service cell is larger than the first distance, if the terminal equipment is in an idle state, the cell re-search is immediately triggered, and if the terminal equipment is in a connected state, the RRC connection re-establishment is immediately triggered, the terminal equipment does not need to wait, or wait for the indication of the network equipment, and the corresponding action can be triggered autonomously.

It should be appreciated that the system message of the serving cell will typically carry satellite ephemeris information, including the current serving satellite ephemeris and the neighboring satellite ephemeris. Typically, the satellite ephemeris includes information about the position of the satellite, including, for example, the orbit of the satellite and the current time of day position of the satellite. The terminal equipment can determine the satellite running track based on the satellite position information, and the terminal equipment can determine the center position of the service cell through the satellite current time position.

In one possible implementation, the terminal device may determine the position of the next time of the satellite by using the moving track of the satellite and the position of the current time of the satellite, and then determine the projection of the satellite on the ground (i.e., the satellite bottom point) according to the determined satellite of the next time of the satellite, thereby determining the center position of the current serving cell.

In another possible implementation, the location information of the satellites further includes a reference point from which the terminal device can determine the center location of the current serving cell.

In the application, the position information of the terminal equipment can be acquired by a global navigation satellite system (global navigation SATELLITE SYSTEM, GNSS), a global positioning system (global positioning system, GPS) and other methods.

The "first distance" in the present application is used to characterize the distance between the center position of the current serving cell and the edge position of the current serving cell. It should be noted that, the specific value of the "first distance" in the present application may be understood as a distance between the center position of the current serving cell and the edge position of the current serving cell. Wherein the edge position of the cell is usually estimated. For example, in the satellite #1 coverage shown in fig. 4, the actual coverage of the satellite #1 may be the coverage shown by the outermost broken line, and the coverage shown by the inner solid line may be estimated. Therefore, the edge position of the cell may be the position of the outermost broken line or the position of the inner solid line. Or it is understood that the edge position of the cell cannot be accurately determined in practice. For example, a schematic diagram of the "first distance" is shown in fig. 4. Thus, the "first distance" in the present application is actually an approximate value or a predicted value.

Based on the scheme, in the application, if the terminal equipment determines that the signal quality of the current service cell is smaller than or equal to the first threshold value and the distance between the current position of the terminal equipment and the central position of the service cell is larger than the first distance, the cell search can be immediately triggered or the RRC connection reestablishment can be immediately triggered, so that the resident cell can be more quickly determined, the time of signal loss is reduced, and the service experience of a user is ensured.

With reference to the first aspect, in one possible implementation manner, the first distance may be preconfigured.

With reference to the first aspect, in a possible implementation manner, the method further includes that the terminal device receives a system message from the serving cell, where the system message carries a distance threshold corresponding to the serving cell, and the terminal device determines the first distance according to the distance threshold corresponding to the serving cell and the first offset value, where the first offset value is preconfigured.

Based on the above scheme, in the present application, for example, when the terminal device first executes the technical scheme of the present application, multiple implementation manners for acquiring the first distance are provided, so that the terminal device can flexibly acquire the first distance.

With reference to the first aspect, in one possible implementation manner, the method further includes that the terminal equipment resides in the first cell, the terminal equipment receives a system message from the first cell, wherein the system message carries measurement information of the first cell and measurement information of a neighboring cell of the first cell, and reselects to the neighboring cell of the first cell according to the system message of the first cell when the signal quality of the first cell does not meet the S criterion and the signal quality of the neighboring cell of the first cell meets the S criterion.

With reference to the first aspect, in a possible implementation manner, the system message of the first cell further carries position information of a satellite, the position information of the satellite includes a moving track of the satellite and a position of the satellite at a current time, and/or the position information of the satellite includes a reference point of the satellite, and the method further includes determining a center position of the first cell according to the system message of the first cell.

The above technical solution may also be understood that if the terminal device performs cell search, and finds that, among the multiple candidate cells that are searched, a distance between a current location of the terminal device and a center location of the first cell is smaller than the first distance, the terminal device may reside in the first cell. The terminal device may trigger measurement in the first cell due to the position movement at the edge position of the first cell, find that the neighboring cell of the first cell can be reselected after the measurement (i.e. find that the signal quality of the first cell is poor after the measurement, and the signal quality of the neighboring cell of the first cell is good), and at this time, the terminal device may update the first distance according to the distance between its current position and the central position of the first cell. For example, the updated first distance is used for the terminal device to trigger a cell re-search or RRC connection re-establishment in the reselected cell. For another example, the updated first distance may be used to maintain a first offset value.

In combination with the first aspect, in one possible implementation manner, the system message of the first cell carries a distance threshold corresponding to the first cell, and the method further includes updating a first offset value according to the updated first distance and the distance threshold corresponding to the first cell, receiving the system message from the second cell, where the system message of the second cell carries a distance threshold corresponding to the second cell, and the second cell is a neighboring cell of the reselected first cell, and determining the first distance according to the updated first offset value and the distance threshold corresponding to the second cell.

The above technical solution may also be understood that the terminal device may update the first distance when reselecting, update the first offset value based on the updated first distance, receive a distance threshold corresponding to the second cell in the reselected second cell, and then determine the first distance according to the distance threshold corresponding to the second cell and the updated first offset value. When the terminal device subsequently finds that the signal quality in the second cell is less than or equal to the first threshold due to the position movement and determines that the distance between its current position and the center position of the second cell is greater than the determined first distance, cell search or RRC re-establishment may be triggered in the second cell.

Based on the technical scheme, the terminal equipment can flexibly update and maintain the first distance based on the current actual situation, so that the first distance is more accurate and more matched with the specific scene of the terminal equipment.

With reference to the first aspect, in a possible implementation manner, the method further includes, in the searched plurality of candidate cells, if a distance between the first location and a center location of each candidate cell is greater than or equal to the first distance, camping on a third cell, where the third cell is a cell closest to the terminal device in the plurality of candidate cells.

With reference to the first aspect, in one possible implementation manner, in another possible implementation manner, the terminal device may also temporarily determine a second distance, where the second distance is an average value of distances between the terminal device and central positions of the candidate cells that are searched for in the plurality of candidate cells that cannot reside. In other words, if the terminal device determines that the distances from the searched plurality of candidate cells are too far to exceed the first distance, the terminal device can determine the distances from the center position of each candidate cell, determine an average value as the second distance temporarily, and find the first cell smaller than the second distance from the plurality of candidate cells as the cell to be resided. Subsequently, for example, the terminal device may update the first distance based on the manner provided above.

With reference to the first aspect, in one possible implementation manner, when the terminal device finds that each candidate cell searched cannot reside, the first distance may also be directly and temporarily ignored, and one candidate cell is randomly selected as a resident cell from the plurality of candidate cells searched. Subsequently, for example, the terminal device may update the first distance based on the manner provided above.

Based on the above technical solution, in the present application, it is proposed that if the terminal device cannot camp on the searched multiple candidate cells, it is indicated that the first distance is not suitable for the current scenario (for example, the first distance is configured to be too small in the current scenario, so that the distance between the terminal device and the center position of any one candidate cell is greater than the first distance), and the terminal device cannot camp on any one searched cell, at this time, the terminal device may adopt multiple methods to ensure that the terminal device may camp on one of the cells, and then update the first distance.

With reference to the first aspect, in a possible implementation manner, the method further includes determining a first parameter and a second parameter according to the first position and the position information of the satellite, where the first parameter is used to represent a distance between the first position and the second axis, the second parameter is used to represent a distance between the first position and the first axis, the first axis is determined according to a moving track of the satellite, the first axis is used to represent a moving track of the satellite, the second axis is perpendicular to the first axis, and an intersection point of the first axis and the second axis is a center position of the serving cell.

With reference to the first aspect, in a possible implementation manner, the first distance includes a third parameter and a fourth parameter, where the third parameter is used to characterize a distance between an edge position of the serving cell and the second axis, the fourth parameter is used to characterize a distance between an edge position of the serving cell and the first axis, and when a signal quality of the serving cell is less than or equal to a first threshold value and a distance between the first position and a center position of the serving cell is greater than or equal to the first distance, triggering cell search or RRC connection reestablishment includes triggering cell search or radio resource control RRC connection reestablishment when a signal quality of the serving cell is less than or equal to the first threshold value and a value of the first parameter is greater than or equal to a value of the third parameter, and/or triggering cell search or radio resource control RRC connection reestablishment when a signal quality of the serving cell is less than or equal to the first threshold value and a value of the second parameter is greater than or equal to a value of the fourth parameter.

In the present application, when the coverage of the satellite is approximately circular (for example, the coverage is rectangular or square), the first distance configured at this time may be represented by a plurality of parameters, and the location of the terminal device may also be represented by a plurality of parameters. In this scenario, the terminal device may trigger a cell search or RRC connection re-establishment when the signal quality of the serving cell is less than or equal to the first threshold and any one of the parameters in the first location is greater than the corresponding one of the parameters in the first distance.

Based on the technical scheme, the characteristic mode of the first distance is optimized in consideration of the diversity of the cell coverage shape, so that the terminal equipment can flexibly judge whether the current position is greater than the first distance from the center position of the cell based on the cell coverage of different shapes.

With reference to the first aspect, in a possible implementation manner, the system message of the serving cell further carries a distance threshold, where the distance threshold includes a fifth parameter and a sixth parameter, where the fifth parameter is used to characterize a distance between the second axis and the starting measurement point when the measurement is started, and the sixth parameter is used to characterize a distance between the first axis and the starting measurement point when the measurement is started.

In the present application, the distance threshold (DISTANCE THRESH) may also be characterized by a number of parameters when the satellite coverage is approximately circular (e.g., the coverage is rectangular, square). For example, the condition for the terminal device to trigger measurement in this scenario may be that when any one of the parameters in the first location is greater than the corresponding one of the parameters in the distance threshold, cell measurement may be triggered.

In this scenario, the terminal device may update and maintain the first distance by itself based on the foregoing technical solution. For example, the terminal device triggers measurement of the first axis, and then the parameter corresponding to the first axis in the first distance may be updated later. For another example, if the terminal device triggers measurement of the second axis, the parameter corresponding to the second axis in the first distance may be updated later.

With reference to the first aspect, in one possible implementation manner, the system message of the serving cell further carries a first distance.

In this scenario, the NTN may directly notify the terminal device of the plurality of parameters corresponding to the first distance. For example, the terminal device may not need to update and maintain the first distance by itself at this time. For another example, the terminal device may continue to update the respective parameters of the locally maintained first distance based on the received plurality of parameters corresponding to the first distance.

In a second aspect, the present application proposes a communication device for performing the method of the first aspect described above. In particular, the device may comprise units and/or modules, such as a transceiver unit and/or a processing unit, for performing the proposed communication method of the application.

In a third aspect, there is provided a communications device comprising at least one processor for executing a computer program or instructions stored in a memory to perform the method of the first aspect described above. Optionally, the device further comprises a memory for storing a computer program or instructions. Optionally, the device further comprises a communication interface through which the processor reads the computer program or instructions stored in the memory.

In one implementation, the device is a functional communication device for implementing the communication method provided by the application in a chip.

In another implementation, the device is a functional chip, a system-on-chip or a circuit for implementing the communication method provided by the application in the chip.

In a fourth aspect, the present application provides a processor comprising an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal via the input circuit and transmit a signal via the output circuit, such that the processor performs the method of the first aspect.

In a specific implementation process, the processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a transceiver, the output signal output by the output circuit may be output to and transmitted by, for example and without limitation, a transmitter, and the input circuit and the output circuit may be the same circuit, which functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the application does not limit the specific implementation modes of the processor and various circuits.

The operations such as transmitting and acquiring/receiving, etc. related to the processor may be understood as operations such as outputting and receiving, inputting, etc. by the processor, and may be understood as operations such as transmitting and receiving by the radio frequency circuit and the antenna, if not specifically stated, or if not contradicted by actual function or inherent logic in the related description, which is not limited by the present application.

In a fifth aspect, a processing device is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory and to receive signals via the transceiver and to transmit signals via the transmitter to perform the method of the first aspect described above.

Optionally, the processor is one or more, and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

In a specific implementation process, the memory may be a non-transient (non-transitory) memory, for example, a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.

It should be appreciated that the related data interaction process, for example, transmitting the indication information, may be a process of outputting the indication information from the processor, and the receiving the capability information may be a process of receiving the input capability information by the processor. Specifically, the data output by the processor may be output to the transmitter, and the input data received by the processor may be from the transceiver. Wherein the transmitter and transceiver may be collectively referred to as a transceiver.

The processing device in the fifth aspect described above may be one or more chips. The processor in the processing device may be implemented in hardware or in software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like, and when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated in the processor, may be located outside the processor, and exist independently.

In a sixth aspect, there is provided a computer readable storage medium storing program code for execution by a device, the program code comprising instructions for performing the method of the first aspect described above.

In a seventh aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.

In an eighth aspect, there is provided a chip system comprising a processor for calling and running a computer program from a memory, such that a device in which the chip system is installed performs the method of the first aspect described above.

A ninth aspect provides a communication system comprising a terminal device and an NTN device. Wherein the terminal device is configured to perform any one of the possible implementation methods of the first aspect.

Drawings

Fig. 1 is a schematic view of a scenario in which the present application is applicable.

Fig. 2 is a schematic diagram of a terminal device measuring neighbor cells according to the present application.

Fig. 3 is a schematic flow chart of a communication method 300 provided by the present application.

Fig. 4 is a schematic view of a first distance provided by the present application.

Fig. 5 is another schematic diagram of a communication method provided by the present application.

Fig. 6 is another schematic view of the first distance provided by the present application.

Fig. 7 is a schematic block diagram of a communication device 100 provided by the present application.

Fig. 8 is a schematic block diagram of a communication device 200 provided by the present application.

Detailed Description

The technical scheme of the application will be described below with reference to the accompanying drawings.

Wireless communication systems to which embodiments of the present application may be applied include, but are not limited to, a global system for mobile communications (global system of mobile communication, GSM) system, a long term evolution (long term evolution, LTE) frequency division duplex (frequency division duplex, FDD) system, a LTE time division duplex (time division duplex, TDD), a LTE system, a long term evolution-Advanced (LTE-a) system, a next generation communication system (e.g., a 6G communication system), a converged system of multiple access systems, or an evolved system.

The technical scheme provided by the application can be also applied to machine type communication (MACHINE TYPE communication, MTC), inter-machine communication long term evolution (long term evolution-machine, LTE-M), device-to-device (D2D) network, machine-to-machine (machine to machine, M2M) network, internet of things (internet of things, ioT) network or other networks. The IoT network may include, for example, an internet of vehicles. The communication modes in the internet of vehicles system are collectively called vehicle-to-other devices (V2X, X may represent anything), and for example, the V2X may include vehicle-to-vehicle (vehicle to vehicle, V2V) communication, vehicle-to-infrastructure (vehicle to infrastructure, V2I) communication, vehicle-to-pedestrian communication (vehicle to pedestrian, V2P) or vehicle-to-network (vehicle to network, V2N) communication, etc.

The terminal device according to the embodiment of the present application may include various access terminals, mobile devices, user terminals or user apparatuses having a wireless communication function. For example, the terminal device may be a User Equipment (UE), such as a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, and the like. The terminal devices may also be wireless terminals in industrial control (industrial control), machine type communication (MACHINE TYPE communication, MTC) terminals, customer terminal devices (customer premise equipment, CPE), wireless terminals in unmanned-drive (self-drive), wireless terminals in telemedicine (remote media), wireless terminals in smart grid (SMART GRID), wireless terminals in transportation security (transportation safety), wireless terminals in smart city (SMART CITY), smart home (smart home), cellular phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal DIGITAL ASSISTANT, PDA), handheld devices with wireless communication functionality, computing devices or other processing devices connected to wireless modems, vehicle devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolving public land mobile communication networks (public land mobile network, PLMN), etc.

The satellite mentioned in the embodiment of the application can also be a satellite base station or network side equipment carried on the satellite.

The low orbit satellite communication technology developed at present enables satellite communication to gradually enter the life of ordinary people, and is similar to a ground base station cell. Since the satellites are low-orbit satellites, not stationary orbit satellites, the relative earth position of the satellites is constantly moving, and it is also understood that the coverage of satellite cells is constantly changing. Fig. 1 is a schematic view of a scenario where the present application is applicable, as shown in fig. 1, when a satellite flies around the earth at high altitude, the signal strength changes are not obvious at the cell edge and the cell center point, and therefore, the terminal device is insensitive to triggering neighbor cell measurement.

To solve the above problem, the concept of "distance threshold (distance threshold)" is currently introduced, as shown in fig. 2. In idle state, if the terminal equipment moves within the distance threshold, the terminal equipment can not start measuring neighbor cells at the moment, and if the terminal equipment moves outside the distance threshold, the terminal equipment needs to start measuring neighbor cells. In the connected state, distance-related measurements and reporting are also increased. Although a distance threshold is introduced so that the terminal equipment can trigger neighbor cell measurement, if the network equipment does not configure a proper neighbor cell for the terminal equipment or the configured measurement condition is not proper, the terminal equipment cannot measure the signal quality of the neighbor cell even if the signal quality of the terminal equipment and the current service cell is not good and the measurement condition for triggering the neighbor cell is met at the moment, and if the terminal equipment is positioned at the cell boundary, the signal quality of the neighbor cell cannot be measured due to the fact that the satellite rotates the terminal equipment. Under these scenes, the terminal equipment cannot perform neighbor cell measurement in time, so that the signal interruption time is long, and the service experience of the user is poor. Similarly, in the connected state, it is assumed that the network device may not trigger the handover either due to the link failure, or the handover failure, or the radio resource control (radio resource control, RRC) reconfiguration failure, or the terminal device itself may not trigger the RRC connection reestablishment, or may cause signal interruption, which affects the service experience of the user.

In view of this, the present application provides a communication method, in an idle state, when a terminal device determines that the signal quality of a current serving cell is less than or equal to a first threshold value, and determines that a distance from a center of the serving cell is greater than a first distance, cell search may be actively triggered, so that a corresponding cell is searched to reside, and a time of signal interruption may be reduced. When the signal quality of the service cell is smaller than or equal to a first threshold value in a connection state, if the terminal equipment determines that the distance from the center of the service cell is larger than the first distance, the RRC connection can be actively triggered to reestablish, so that a link is recovered, and the signal interruption time is reduced. The method provided by the application can ensure the service experience of the user.

Fig. 3 is a schematic flow chart of a communication method 300 provided by the present application, as shown in fig. 3, the method includes:

the terminal device determines that the signal quality of the serving cell is less than or equal to a first threshold, and a distance between a first location and a central location of the serving cell is greater than or equal to a first distance, wherein the first location is a current location of the terminal device.

302, The terminal device triggers a cell search or RRC connection re-establishment.

The above steps 301 and 302 may also be understood that, in a case where the signal quality of the serving cell is less than or equal to the first threshold and the distance between the first location and the central location of the serving cell is greater than or equal to the first distance, the terminal device triggers cell search or RRC connection re-establishment. Wherein, the terminal equipment resides in a service cell, and the service cell is an NTN cell.

The cell search is triggered, for example, when the terminal device is in an idle state, or the RRC connection re-establishment is triggered when the terminal device is in a connected state.

In the present application, the "signal quality of the serving cell is less than or equal to the first threshold" may be understood as that the signal quality of the serving cell is deteriorated. Alternatively, it is also understood that the first threshold is used to determine whether the signal quality of the serving cell is degraded. For example, the signal quality of the serving cell does not meet the S criterion, or the Reference Signal Received Quality (RSRQ) of the serving cell is less than or equal to a certain threshold, or the reference signal received power (REFERENCE SIGNAL RECEIVING power, RSRP) is less than or equal to a certain threshold, or the signal to interference plus noise ratio (signal to interference plus noise ratio, SINR) is less than or equal to a certain threshold. For example, the terminal device may receive a synchronization signal block (synchronization signal block ) from the serving cell, and measure the signal quality of the serving cell to determine whether the signal quality of the current serving cell meets the S criterion. For another example, the terminal device may measure the reference signal to determine whether RSRP, RSRQ, SINR of the current serving cell meets the threshold value.

The "S criterion (Srxlev)" in the present application may be described with reference to the definition of the existing S criterion, which is typically used for cell selection or cell reselection. The calculation formula is Srxlev=Qrxlevmeas-Qrxlevmin-Paccounting, wherein the current service cell receiving power measured by Qrxlevmeas refers to a reference signal receiving power (REFERENCE SIGNAL RECEIVING power, RSRP) value of a P-CCPCH channel, qrxlevmin is the minimum receiving power of the current service cell, the parameter can be read from a system broadcast message, certain arithmetic conversion is needed after the reading of general terminal equipment, paccounting is a compensation value, and Paccounting is calculated by the following formula, namely Paccounting=max (UE_TXP-WR_MAX_RACH-P_MAX, 0), wherein UE_TXPWR_MAX_RACH is the maximum transmitting power of the RACH when the terminal is randomly accessed, the UE_TXPWR_MAX_RACH is transmitted by a system broadcast message, the parameter is generally set to be 0, and P_MAX is the maximum nominal transmitting power of the terminal and is determined by the capability of the terminal equipment.

The "first threshold value" and "threshold value" mentioned in the present application may be preconfigured according to actual conditions. For example, if it is determined in a general sense that RSRP is less than a certain value representing a degradation of signal quality of the current serving cell, the first threshold or threshold value here may be the value.

It should be appreciated that the system message of the serving cell will typically carry satellite ephemeris information, including the current serving satellite ephemeris and the neighboring satellite ephemeris. Typically, the satellite ephemeris includes information about the operational position of the satellite, including, for example, the operational trajectory of the satellite and the current time of day position of the satellite.

The terminal equipment can determine the satellite running track based on the satellite running position information, and the terminal equipment can determine the center position of the service cell through the current position of the satellite. For example, the terminal device may determine the center position of the current serving cell by projection of the satellite on the ground (i.e., the sub-satellite point), and for example, the information of the satellite ephemeris may include a reference point from which the terminal device may determine the center position of the cell.

The "first distance" in the present application is used to characterize the distance between the center position of the current serving cell and the edge position of the current serving cell. It should be noted that, the specific value of the "first distance" in the present application may be understood as a distance between the center position of the current serving cell and the edge position of the current serving cell. Wherein the edge position of the cell is usually estimated. For example, in the satellite #1 coverage shown in fig. 4, the actual coverage of the satellite #1 may be the coverage shown by the outermost broken line, and the coverage shown by the inner solid line may be estimated. Therefore, the edge position of the cell may be the position of the outermost broken line or the position of the inner solid line. Or it is understood that the edge position of the cell cannot be accurately determined in practice. For example, the "first distance" may be understood as "edge distance (EDGE DISTANCE)" between the center position of the cell and the edge position of the cell shown in fig. 4. Thus, the "first distance" in the present application is actually an approximate value or a predicted value.

The determination mode, the updating mode and the use mode of the first distance are described in detail below.

Case one

For example, when the terminal device first executes the technical solution provided by the present application, the terminal device needs to acquire the first distance when determining to trigger cell search or trigger RRC connection reestablishment, and at this time, the terminal device may acquire the first distance through the following implementation manner:

In one possible implementation of the present application, the first distance may be preconfigured. It is also understood that the first distance is preconfigured in the terminal device. For example, one skilled in the art may set the value of the first distance based on historical experience or actual conditions. In another possible implementation, the terminal device may receive a system message from a serving cell, where the system message carries a distance threshold (DISTANCE THRESH) corresponding to the serving cell, and the terminal device may determine the first distance based on the received distance threshold and a preconfigured first offset value. In the present application, the "first offset value" may be, for example, preconfigured in the terminal device. For example, the first distance may be obtained from an algebraic operation of the first offset value and the distance threshold. Illustratively, the value of the first distance is equal to a sum of the first offset value and the distance threshold.

In the present application, the units of the "first distance" and the "distance threshold" may be meters (m), kilometers (km), etc., and specific units may be set according to actual situations, and are not limited thereto. The definition of "distance threshold" may be found in technical specification (TECHNICAL SPECIFICATION, TS) 38.304, and the present application will not be described in detail.

Case two

When the terminal device has executed the technical scheme of the present application once, that is, after the terminal device resides in a certain cell in the searched candidate cells, the terminal device can update the value of the first distance at this time, and the method for updating the first distance provided by the present application is described below.

Mode one

It is assumed that the terminal device finds that, among the plurality of candidate cells searched, the distance between the current position and the central position of the first cell is smaller than the first distance, and may camp on the first cell, and the terminal device may trigger measurement in the first cell due to the position movement at the edge position of the first cell, and then find that it is possible to reselect to one of the neighboring cells by measuring several neighboring cells of the first cell. It should be appreciated that the terminal device has received a system message (e.g., a system information block (systeminformation block, SIB)) from the first cell prior to determining the reselection, the system message carrying measurement information of the first cell and measurement information of a neighbor cell of the first cell. In addition, the system message also carries satellite location information. For example, the position information of the satellite includes the trajectory of the satellite and the position of the satellite at the current time. The terminal equipment determines the position of the satellite at the next moment according to the moving track of the satellite and the current position of the satellite, so that the central position of the first cell can be determined. The terminal equipment can clearly acquire the position of the terminal equipment at the reselection time when the terminal equipment reselects, and at the moment, the terminal equipment can update the first distance according to the position of the terminal equipment at the reselection time and the determined central position of the first cell.

It should be noted that, in general, the "location of the terminal device at the time of reselection" may be all located at the edge of the cell.

In the application, the terminal equipment can update the first distance during reselection, and then the service transmission is carried out on the reselected cell. For example, the updated first distance is used for the terminal device to trigger a cell re-search or RRC connection re-establishment in the reselected cell. For another example, the updated first distance is used for the terminal device to update the first offset value.

Mode two

It is assumed that the terminal device camps on the first cell among the searched candidate cells, and the terminal device may trigger measurement in the first cell due to the position movement at the edge position of the first cell, and the terminal device finds neighboring cells with better signal quality around, so that the terminal device determines that the terminal device can reselect to the second cell and updates the first distance when performing cell reselection. It is assumed that the system message received by the terminal device in the first cell further carries a distance threshold corresponding to the first cell, and at this time, the terminal device may update the first offset value according to the updated first distance and the distance threshold corresponding to the first cell (for example, the value of the first distance minus the value of the distance threshold corresponding to the first cell may obtain the first offset value). Subsequently, the terminal device reselects to the second cell, and the terminal device receives a system message in the second cell, where the system message carries a distance threshold corresponding to the second cell, and at this time, the terminal device may determine a first distance according to the updated first offset value and the distance threshold corresponding to the second cell (for example, the updated first offset value and the value of the distance threshold corresponding to the second cell are added, and may obtain the first distance). When the terminal device subsequently finds that the signal quality in the second cell is less than or equal to the first threshold due to the position movement and determines that the distance between its current position and the center position of the second cell is greater than the determined first distance, cell search or RRC re-establishment may be triggered in the second cell.

It may also be understood that in the second mode, the main purpose of the terminal device to update the first distance according to the distance between the position of the reselection time point and the center position of the first cell is to update the first offset value, and then when the terminal device reselects in the second cell, the first distance may be determined by using the distance threshold received in the second cell and the updated first offset value, and the determined first distance may be used by the terminal device to determine whether to trigger cell search or RRC reestablishment in the second cell.

Based on the technical scheme, the terminal equipment can flexibly update and maintain the first distance based on the current actual condition, so that the first distance is more accurate and more matched with the specific scene of the terminal equipment.

Mode three

It is assumed that, among the plurality of candidate cells searched, if the distance between the current location of the terminal device and the center location of each candidate cell is greater than or equal to the first distance.

At this time, in one possible implementation, the terminal device may camp on a third cell, where the third cell is one of the candidate cells closest to the current location of the terminal device. It is also understood that the terminal device may select a cell closest to the terminal device from among the several cells searched for as the camping cell.

In another possible implementation manner, the terminal device may also temporarily determine a second distance, where the second distance is an average value of the distances between the terminal device and the center positions of the candidate cells in the searched plurality of candidate cells that cannot reside. In other words, if the terminal device determines that the distances from the searched plurality of candidate cells are too far to exceed the first distance, the terminal device can determine the distances from the center position of each candidate cell, determine an average value as the second distance temporarily, and find the first cell smaller than the second distance from the plurality of candidate cells as the cell to be resided. Subsequently, for example, the terminal device may update the first distance based on the first or second manner described above.

In yet another possible implementation manner, when the terminal device finds that each candidate cell searched cannot reside, the first distance may also be directly and temporarily ignored, and one candidate cell is randomly selected as the resident cell from the plurality of candidate cells searched. Subsequently, for example, the terminal device may update the first distance based on the first or second manner described above.

Based on the above technical solution, in the present application, it is proposed that if the terminal device cannot camp on the searched multiple candidate cells, it is indicated that the first distance configured in the current scenario is not appropriate (for example, the first distance is configured to be too small, so that the distance between the terminal device and the center position of any one candidate cell is greater than the first distance, and the terminal device cannot camp on any one searched cell), at this time, the terminal device may adopt various methods to ensure that the terminal device can camp on one of the cells, and then update the first distance.

Fig. 5 is a schematic block diagram of various modules inside a terminal device provided by the present application. The system comprises a cell search management module, a connection state measurement report management module, a reconstruction management module and a communication system, wherein the cell search management module comprises basic functions of controlling cell search, cell selection, cell residence and the like, the cell reselection management module comprises basic functions of processing measurement results of residence cells, responding measurement start-stop, reselection candidate cell selection and the like, the measurement management module is used for processing the measurement results of cells received by terminal equipment, the connection state measurement report management module is used for reporting the measurement results of the terminal equipment to NTN according to protocol requirements, the reconstruction management module is used for conducting connection state link reconstruction according to protocol description, the active search management module is used for actively triggering cell search when a service cell signal is smaller than or equal to a first threshold value and determining that the distance between the terminal equipment and the center of a current service cell is larger than a first distance, and determining that the signal quality of the service cell is smaller than or equal to the first threshold value and determining that the distance between the terminal equipment and the center of the current service cell is larger than the first distance and the RRC connection weight value is actively triggering the RRC connection state, and the communication system is capable of establishing communication with the cell and the SIB. The system comprises a signal receiving and transmitting system module, a measurement management module, a cell reselection management module and a connection state measurement reporting management module, wherein the signal receiving and transmitting system module periodically measures signals of a current service cell and reports measurement results of the signals to the measurement management module, the measurement management module reports the measurement results to the cell reselection management module in an idle state after performing basic filtering processing, and the measurement results are reported to the connection state measurement reporting management module in a connection state.

As an example, as shown in fig. 5, the cell reselection management module determines that the signal quality of the serving cell is less than or equal to a first threshold, in one possible implementation manner, the cell reselection module may perform cell reselection normally, when the terminal device cannot perform cell reselection, the cell reselection management module may send notification information that the signal quality of the serving cell does not meet the first threshold to the active search management module, and after receiving the notification information that the signal quality of the serving cell of the cell reselection management module does not meet the first threshold, the active search management module may further check whether the distance between the terminal device and the center position of the current serving cell is greater than the first distance, and if the active search management module determines that the distance between the terminal device and the center position of the current serving cell is greater than the first distance, the active search management module may notify the cell selection module to perform cell search. In another possible implementation manner, when the cell reselection management module determines that the signal quality of the serving cell is smaller than or equal to the first threshold, the active search management module may directly send a notification message that the signal quality of the serving cell does not meet the first threshold to the active search management module, and after receiving the notification message that the signal quality of the serving cell of the cell reselection management module does not meet the first threshold, the active search management module further checks whether the distance between the terminal device and the center position of the current serving cell is greater than the first distance, and if the active search management module determines that the distance between the terminal device and the center position of the current serving cell is greater than the first distance, the active search management module may notify the cell selection module to perform cell search.

As another example, as shown in fig. 5, the connection state measurement reporting module reports the measurement result to the NTN periodically or in an event, when the connection state measurement reporting module determines that the signal quality of the serving cell is less than or equal to the first threshold, or detects that the air interface resource between the terminal device and the NTN is out of step, a notification message that the signal quality of the serving cell does not meet the first threshold may be sent to the active search management module, and after the active search management module receives the notification message that the measurement result of the connection state measurement reporting module does not meet the first threshold, the active search management module further checks whether the distance between the terminal device and the center of the current serving cell is greater than the first distance, and if the active search management module determines that the distance between the terminal device and the center of the current serving cell is greater than the first distance, the cell selection module is notified to perform RRC connection reestablishment.

Fig. 6 shows a way of characterizing the first distance according to the present application, in which it is considered that the coverage of a cell in a cellular network is substantially elliptical, but in NTN, because the coverage of a satellite is too large, if it is still set to be elliptical, the overlapping area of the coverage between satellites may be very large, which may affect the communication efficiency of the terminal device. In view of this, the present application proposes that the coverage of the NTN satellites can be considered to be set to a quadrangle, for example, a rectangle. In this scenario, how the first distance should be determined, the technical solution of the present application will be described in detail below.

As shown in fig. 6, it is assumed that when the coverage of the satellite is rectangular, the terminal device location can be characterized by a number of parameters. For example, the terminal device may receive a system message from the serving cell, where the system message carries position information of a satellite, and the terminal device determines, according to the position information of the satellite, a satellite running track and a central position of the serving cell, and specifically, the position information of the satellite includes the satellite running track and a position of the satellite at a current time, and the terminal device determines, according to the position of the satellite at the current time, the central position of the serving cell. The terminal device determines a first axis (e.g., X axis) and a second axis (e.g., Y axis) according to the satellite motion trajectory and the center position of the serving cell, wherein the first axis is used for representing the satellite motion trajectory, the second axis is perpendicular to the first axis, the center position of the serving cell is an intersection point of the first axis and the second axis, and determines a first parameter (e.g., k) and a second parameter (e.g., l) according to the first position, the first axis and the second axis, wherein the first parameter is used for representing the distance between the first position and the second axis, and the second parameter is used for representing the distance between the first position and the first axis, as shown in (a) in fig. 6.

Also, for example, the "first distance" in the present application may be characterized using a plurality of parameters. For example, the first distance is characterized by a third parameter (e.g., K) and a fourth parameter (e.g., L). Wherein the third parameter is used to characterize the distance between the edge position of the serving cell and the second axis and the fourth parameter is used to characterize the distance between the edge position of the serving cell and the first axis. Therefore, the technical solution of the present application may also be understood as triggering cell search or radio resource control RRC connection re-establishment in case the signal quality of the serving cell is less than or equal to the first threshold value and the value of the first parameter is greater than or equal to the value of the third parameter, and/or triggering cell search or radio resource control RRC connection re-establishment in case the signal quality of the serving cell is less than or equal to the first threshold value and the value of the second parameter is greater than or equal to the value of the fourth parameter. In other words, the terminal device may trigger cell re-search or RRC connection re-establishment in this scenario whenever at least one of the distance between the terminal device and the first axis or the distance between the terminal device and the second axis is greater than the third parameter or the fourth parameter in the first distance. For example, as shown in (c) of fig. 6, since L (one example of the second parameter) is greater than L (one example of the fourth parameter), if the terminal device determines that the signal quality of the current serving cell is less than or equal to the first threshold, cell search may be immediately triggered or RRC connection re-establishment may be immediately triggered.

Similarly, in this scenario, the "distance threshold" carried by the NTN in the system message may also be indicated with multiple parameters. For example, in the implementation shown in fig. 6, a fifth parameter (e.g., k _th) is used to indicate the measurement threshold for the first axis, and a sixth parameter (e.g., l _th) is used to indicate the measurement threshold for the second axis. Specifically, for example, a fifth parameter is used to characterize the distance between the measurement point and the second axis at the time of starting measurement, and a sixth parameter is used to characterize the distance between the measurement point and the first axis at the time of starting measurement. For example, the condition for the terminal device to trigger measurement in this scenario may be that when any one of the parameters in the first location is greater than the corresponding one of the parameters in the distance threshold, cell measurement may be triggered. For example, when the value of the second parameter is greater than the value of the sixth parameter, the terminal device may be triggered to measure the neighbor cell, as shown in (b) of fig. 6.

In this scenario, similarly, the terminal device may update and maintain the first distance in the various manners described above (e.g., manners one through three). In one possible implementation, the terminal device triggers measurement of the first axis, and then the parameter corresponding to the first axis in the first distance may be updated later. For another example, if the terminal device triggers measurement of the second axis, the parameter corresponding to the second axis in the first distance may be updated later. For another example, if the terminal device triggers measurement of the first axis and the second axis at the same time, the parameters corresponding to the first axis and the parameters corresponding to the second axis in the first distance may be updated respectively.

Case one:

In this case, when the terminal device first executes the technical scheme provided by the present application, the terminal device needs to acquire the first distance when determining to trigger cell search or trigger RRC connection reestablishment, and at this time, the terminal device may acquire the first distance through the following implementation manner:

In one possible implementation, the first distance may be preconfigured. For example, a plurality of parameters characterizing the first distance may be respectively configured in the terminal device. In another possible implementation manner, the terminal device may receive a system message from a serving cell, where the system message carries a distance threshold corresponding to the serving cell, and the threshold carries a plurality of parameters, where each parameter is used to indicate a measurement threshold corresponding to each axis. It is assumed that the terminal device configures a corresponding first offset value for each parameter, respectively. The terminal device may determine the first distance based on the received distance threshold and the preconfigured first offset value.

And a second case:

In this case, when the terminal device has executed the technical solution of the present application once, that is, after the terminal device resides in a certain cell in the searched candidate cells, the terminal device may also update the value of the first distance at this time, and the manner of updating the first distance provided by the present application is described below.

Mode one

The terminal device may reside in the first cell if it finds that, among the plurality of candidate cells searched, a distance between a current location of the terminal device and a center location of the first cell is smaller than a first distance. It is also understood that the values of the plurality of parameters characterizing the position of the terminal device are each smaller than the respective values of the plurality of parameters characterizing the first distance. For example, the terminal device determines that the value of the first parameter is smaller than the value of the third parameter and that the value of the second parameter is also smaller than the value of the fourth parameter, at which point it may camp on the first cell. The terminal device may then trigger a measurement in the first cell due to the position movement being at an edge position of the first cell, e.g. in fig. 6 (b) the value of the second parameter of the terminal device is larger than the value of the sixth parameter in the distance threshold. Then by measuring several neighbor cells of the first cell, it is found that one of the neighbor cells can be reselected. It should be appreciated that the terminal device has received a system message (e.g., a system information block (systeminformation block, SIB)) from the first cell prior to determining the reselection, the system message carrying measurement information of the first cell and measurement information of a neighbor cell of the first cell. In addition, the system message also carries information of satellite position operation positions. For example, the position information of the satellite includes the trajectory of the satellite and the position of the satellite at the current time. The terminal equipment can determine the satellite running track, and the terminal equipment can determine the center position of the first cell according to the position of the satellite at the current moment. The terminal device can clearly acquire the position of the terminal device at the reselection time, and at this time, the terminal device can update the fourth parameter in the first distance according to the position of the terminal device at the reselection time and the determined center position of the first cell.

In this scenario, for example, the terminal device may learn which axis corresponds to the parameter-triggered measurement, so that the terminal device may update the parameter accordingly. If the values of the plurality of parameters characterizing the location of the terminal device are all larger than the values of the corresponding plurality of parameters characterizing the first distance, then the terminal device may update each parameter in the first distance.

Mode two

It is assumed that the terminal device camps on the first cell among the searched candidate cells, and the terminal device may trigger a measurement in the first cell due to the position movement being at the edge position of the first cell (e.g. in the example of fig. 6, it may trigger a measurement on both the first axis and the second axis), and find neighboring cells with better signal quality around, and therefore reselect to the second cell, and update the first distance when performing the cell reselection. For example, the terminal device updates a third parameter or a fourth parameter characterizing the first distance. It is assumed that the system message received by the terminal device in the first cell further carries a distance threshold corresponding to the first cell, and at this time, the terminal device may update the first offset value according to the updated first distance and the distance threshold corresponding to the first cell (for example, the value of the first distance minus the value of the distance threshold corresponding to the first cell may obtain the first offset value). For example, the terminal device updates both the first offset value corresponding to the third parameter and the first offset value corresponding to the fourth parameter.

Subsequently, the terminal device receives a system message in the second cell, where the system message carries a distance threshold corresponding to the second cell, and at this time, the terminal device may determine the first distance according to the updated first offset value and the distance threshold corresponding to the second cell (for example, the updated first offset value and the value of the distance threshold corresponding to the second cell are added together, and may obtain the first distance). For example, the distance corresponding to the second cell includes a fifth parameter and a sixth parameter, the terminal device may determine a third parameter for characterizing the first distance according to the first offset value and the fifth parameter corresponding to the first axis, and the terminal device may determine a fourth parameter for characterizing the first distance according to the second offset value and the sixth parameter corresponding to the second axis.

When the terminal device subsequently finds that the signal quality in the second cell is less than or equal to the first threshold due to the position movement and determines that the distance between its current position and the center position of the second cell is greater than the determined first distance (e.g. the value of the first parameter is greater than the value of the third parameter and/or the value of the second parameter is greater than the value of the fourth parameter), a cell search or RRC re-establishment may be triggered in the second cell.

In this scenario, the NTN may also directly notify the terminal device of a plurality of parameters corresponding to the first distance. For example, the terminal device may not need to maintain and update the first distance by itself at this time. For another example, the terminal device may continue to update the respective parameters of the locally maintained first distance based on the received plurality of parameters corresponding to the first distance.

It should be noted that fig. 6 is merely an example, and in the solution shown in fig. 6, the first distance may include two parameter values. In the present application, it is not limited how many parameters can be used for the first distance, for example, the first distance can also be characterized by three parameters, and at this time, the corresponding distance threshold can also be characterized by three parameters.

It is to be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B, and that three cases, a alone, a and B together, and B alone, may be represented. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional modules of the communication device according to the method example, for example, each functional module can be divided corresponding to each function, or two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation. The following description will take an example of dividing each functional module into corresponding functions.

Fig. 7 is a schematic block diagram of a communication device 100 provided by an embodiment of the present application. As shown in fig. 7, the communication device 100 may include a processing unit 110, a transceiving unit 120, and a determining unit 130.

The foregoing modules are respectively used to execute the steps in the foregoing communication method 300, which is not described herein.

It should also be understood that the functional units of the communication device 100 herein are embodied in the form. The term "unit" herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor, etc.) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality.

The communication device 100 of each of the above aspects has functionality to implement the corresponding steps of the method 300 described above. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above, and for example, the determining unit or the like may be replaced by a processor to perform the transceiving operations and the related processing operations in the respective method embodiments, respectively. Further, the determination unit may be a processing circuit.

It should be noted that the communication device in fig. 7 may be the communication device in the foregoing method embodiment, or may be a chip or a system on chip (SoC) of the communication device, for example. Wherein the processing unit is an integrated processor or microprocessor or integrated circuit on the chip. And are not limited herein.

Fig. 8 is a schematic block diagram of another communication device 200 provided by an embodiment of the present application. As shown, the device 200 includes at least one processor 210. The processor 210 is coupled to the memory for executing instructions stored in the memory to transmit signals and/or receive signals. Optionally, the device 200 further comprises a memory 230 for storing instructions. Optionally, the device 200 further comprises a transceiver 220, and the processor 210 controls the transceiver 220 to transmit signals and/or to receive signals.

It should be appreciated that the processor 210 and the memory 230 may be combined into one processing device, and that the processor 210 is configured to execute program codes stored in the memory 230 to implement the functions described above. In particular implementations, the memory 230 may also be integrated into the processor 210 or independent of the processor 210.

It should also be appreciated that transceiver 220 may include a transceiver (or receiver) and a transmitter (or transmitter). The transceiver may further include antennas, the number of which may be one or more. Transceiver 220 may be a communication interface or interface circuit.

Specifically, the processor 210 in the device 200 may correspond to the processing unit 110 in the communication device 100, determining the proposal 130. The transceiver 220 in the device 200 may correspond to the transmitting unit 120 in the communication device 100.

As an option, the communication device 200 is configured to implement the steps in the above method 300 embodiment.

For example, the processor 210 is configured to execute computer programs or instructions stored in the memory 230 to implement the various steps in the method 300 above.

According to the method provided by the embodiment of the application, the application further provides a computer program product, on which a computer program code is stored, which when run on a computer causes the computer to perform the steps of the method 300 embodiment.

According to the method provided by the embodiment of the present application, the present application further provides a computer readable medium storing a program code, which when run on a computer, causes the computer to perform the steps in the method 300 described above.

The explanation and beneficial effects of the relevant content in any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and are not repeated here.

A computer readable medium storing program code which, when run on a computer, causes the computer to perform the steps of the method 300 described above.

It should be understood that the specific processes of each transceiver and processor to execute the corresponding steps are described in detail in the above method embodiments, and are not described herein for brevity.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capability. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may 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 instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a solid-state disk (solid-state drive STATE DISC, SSD)), or the like.

In the above-described respective device embodiments, the respective steps are performed by respective modules or units, for example, the steps of receiving or transmitting in the method embodiments are performed by a transceiver unit (transceiver), and other steps than transmitting and receiving may be performed by a processing unit (processor). Reference may be made to corresponding method embodiments for the function of a specific unit. Wherein the processor may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a communication device and the communication device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between 2 or more computers. Furthermore, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not described in detail herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, indirect coupling or communication connection of devices or units, electrical, mechanical, or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. The storage medium includes a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

Residing in a service cell, wherein the service cell is a non-ground network NTN cell;

And triggering cell search or Radio Resource Control (RRC) connection reestablishment under the condition that the signal quality of the serving cell is smaller than or equal to a first threshold value and the distance between a first position and the central position of the serving cell is larger than or equal to a first distance, wherein the first distance is used for representing the distance between the central position of the serving cell and the edge position of the serving cell, and the first position is the current position of the terminal equipment.

2. The method according to claim 1, wherein the method further comprises:

Receiving a system message from the service cell, wherein the system message of the service cell carries the position information of a satellite, and the position information of the satellite comprises the running track of the satellite and the current position of the satellite;

And determining the central position of the service cell according to the information of the satellite operation position.

3. The method according to claim 1, wherein the method further comprises:

Receiving a system message from the service cell, wherein the system message of the service cell carries the position information of a satellite, and the position information of the satellite comprises a reference point of the satellite;

And determining the central position of the service cell according to the reference point of the satellite.

4. A method according to any one of claims 1 to 3, wherein the first distance is preconfigured.

5. A method according to any one of claims 1 to 3, further comprising:

Receiving a system message from the service cell, wherein the system message carries a distance threshold corresponding to the service cell;

and determining the first distance according to a distance threshold and a first offset value corresponding to the service cell, wherein the first offset value is preconfigured.

6. The method according to any one of claims 1 to 5, further comprising:

Camping on a first cell;

Receiving a system message from the first cell, wherein the system message carries measurement information of the first cell and measurement information of a neighbor cell of the first cell;

And according to the system message of the first cell, reselecting to the neighboring cell of the first cell when the signal quality of the first cell does not meet the S criterion and the signal quality of the neighboring cell of the first cell meets the S criterion.

7. The method of claim 6, wherein the system message of the first cell further carries position information of a satellite, the position information of the satellite including a moving track of the satellite and a position of the satellite at a current time, and/or the position information of the satellite includes a reference point of the satellite, the method further comprising:

determining the center position of the first cell according to the system information of the first cell;

And updating the first distance according to the distance between the position of the reselection time point and the central position of the first cell.

8. The method of claim 7, wherein the system message of the first cell further carries a distance threshold corresponding to the first cell, the method further comprising:

Updating the first offset value according to the updated first distance and the distance threshold corresponding to the first cell;

Receiving a system message from a second cell, wherein the system message of the second cell carries a distance threshold corresponding to the second cell, and the second cell is a neighboring cell of the reselected first cell;

And determining the first distance according to the updated first offset value and the distance threshold corresponding to the second cell.

9. The method according to any one of claims 1 to 8, further comprising:

And if the distance between the first position and the central position of each candidate cell is larger than or equal to the first distance, the method is carried out to a third cell, wherein the third cell is the cell closest to the terminal equipment in the plurality of candidate cells.

10. The method according to claim 2, wherein the method further comprises:

And determining a first parameter and a second parameter according to the first position and the position information of the satellite, wherein the first parameter is used for representing the distance between the first position and a second axis, the second parameter is used for representing the distance between the first position and the first axis, the first axis is determined according to the moving track of the satellite, the first axis is used for representing the moving track of the satellite, the second axis is perpendicular to the first axis, and the intersection point of the first axis and the second axis is the center position of the serving cell.

11. The method of claim 10, wherein the first distance comprises a third parameter and a fourth parameter, wherein the third parameter is used to characterize a distance between an edge position of the serving cell and the second axis, wherein the fourth parameter is used to characterize a distance between an edge position of the serving cell and the first axis,

And triggering cell search or RRC connection reestablishment when the signal quality of the serving cell is smaller than or equal to a first threshold value and the distance between a first position and the central position of the serving cell is larger than or equal to a first distance, wherein the method comprises the following steps:

Triggering a cell search or radio resource control, RRC, connection re-establishment, and/or in case the signal quality of the serving cell is less than or equal to a first threshold and the value of the first parameter is greater than or equal to the value of the third parameter;

And triggering cell search or Radio Resource Control (RRC) connection reestablishment in the case that the signal quality of the serving cell is less than or equal to a first threshold and the value of the second parameter is greater than or equal to the value of the fourth parameter.

12. The method of claim 11, wherein the system message of the serving cell further carries the first distance.

13. The method according to claim 11 or 12, wherein the system message of the serving cell further carries a distance threshold corresponding to the serving cell, the distance threshold corresponding to the serving cell comprising a fifth parameter and a sixth parameter, wherein the fifth parameter is used to characterize a distance between a measurement point and the second axis when the measurement is started, and the sixth parameter is used to characterize a distance between the measurement point and the first axis when the measurement is started.

14. A communication device is characterized by comprising a determining unit and a processing unit, wherein,

The determining unit is configured to determine that a signal quality of a serving cell is less than or equal to a first threshold, and a distance between a first location and a central location of the serving cell is greater than or equal to a first distance, where the communication device resides in the serving cell, and the serving cell is a non-terrestrial network NTN cell;

The processing unit is configured to trigger cell search or radio resource RRC connection reestablishment, where the first distance is used to characterize a distance between a center position of the serving cell and an edge position of the serving cell, and the first position is a current position of the terminal device.

15. The communication device of claim 14, further comprising a transceiver unit,

The receiving and transmitting unit is used for receiving a system message from the service cell, wherein the system message of the service cell carries the position information of a satellite, and the position information of the satellite comprises the running track of the satellite and the current position of the satellite;

the determining unit is used for determining the center position of the service cell according to the information of the satellite operation position.

16. The communication device of claim 14, further comprising a transceiver unit,

The receiving and transmitting unit is used for receiving a system message from the service cell, wherein the system message of the service cell carries the position information of a satellite, and the position information of the satellite also comprises a reference point of the satellite;

the determining unit is used for determining the center position of the serving cell according to the reference point of the satellite.

17. The communication device of any of claims 14 to 16, wherein the first distance is preconfigured.

18. The communication device according to any one of claims 14 to 16, characterized in that,

The receiving and transmitting unit is used for receiving a system message from the service cell, wherein the system message carries a distance threshold corresponding to the service cell;

The determining unit is configured to determine the first distance according to a distance threshold and a first offset value corresponding to the serving cell, where the first offset value is preconfigured.

19. The communication device according to any one of claims 14 to 18, characterized in that,

The processing unit is used for controlling the communication equipment to reside in a first cell;

the receiving and transmitting unit is used for receiving a system message from the first cell, wherein the system message carries measurement information of the first cell and measurement information of a neighbor cell of the first cell;

The processing unit is configured to control, according to the system message of the first cell, the communication device to reselect to a neighboring cell of the first cell if the signal quality of the first cell does not meet an S criterion and the signal quality of the neighboring cell of the first cell meets the S criterion.

20. The communication device according to claim 19, wherein the system message of the first cell further carries position information of a satellite, the position information of the satellite comprising a trajectory of the satellite and a current time position of the satellite, and/or the position information of the satellite comprises a reference point of the satellite,

The determining unit is used for determining the central position of the first cell according to the position information of the satellite;

The processing unit is configured to update the first distance according to a distance between a position of the reselection time point and a center position of the first cell.

21. The communication device of claim 20, wherein the system message of the first cell further carries a distance threshold corresponding to the first cell;

The processing unit is used for updating the first offset value according to the updated first distance and the distance threshold corresponding to the first cell;

the receiving and transmitting unit is configured to receive a system message from a second cell, where the system message of the second cell carries a distance threshold corresponding to the second cell, and the second cell is a neighboring cell of the first cell that is reselected;

The determining unit is configured to determine the first distance according to the updated first offset value and a distance threshold corresponding to the second cell.

22. The communication device according to any one of claims 15 to 21, characterized in that,

The processing unit is configured to control the communication device to camp on a third cell if, among the plurality of candidate cells searched, the distance between the first location and the center location of each candidate cell is greater than or equal to the first distance, wherein the third cell is a cell closest to the terminal device among the plurality of candidate cells.

23. The communication device of claim 15, wherein the communication device is configured to,

The determining unit is configured to determine a first parameter and a second parameter according to the first position and position information of the satellite, where the first parameter is used to represent a distance between the first position and a second axis, the second parameter is used to represent a distance between the first position and the first axis, the first axis is determined according to a moving track of the satellite, the first axis is used to represent a moving track of the satellite, the second axis is perpendicular to the first axis, and an intersection point of the first axis and the second axis is a center position of the serving cell.

24. The communication device of claim 23, wherein the first distance comprises a third parameter and a fourth parameter, wherein the third parameter is used to characterize a distance between an edge position of the serving cell and the second axis, wherein the fourth parameter is used to characterize a distance between an edge position of the serving cell and the first axis,

The processing unit is configured to trigger cell search or radio resource control RRC connection reestablishment when the signal quality of a serving cell is less than or equal to a first threshold and a distance between a first location and a center location of the serving cell is greater than or equal to a first distance, where the processing unit includes:

In case the signal quality of the serving cell is less than or equal to a first threshold and the value of the first parameter is greater than or equal to the value of the third parameter, the processing unit is configured to trigger a cell search or a radio resource control, RRC, connection re-establishment, and/or;

the processing unit is configured to trigger a cell search or a radio resource control, RRC, connection re-establishment in case the signal quality of the serving cell is less than or equal to a first threshold and the value of the second parameter is greater than or equal to the value of the fourth parameter.

25. The communication device of claim 24, wherein the transceiver unit is configured to receive a system message from the serving cell, and wherein the system message of the serving cell further carries the first distance.

26. The communication device according to claim 24 or 25, wherein the system message of the serving cell further carries a distance threshold comprising a fifth parameter for characterizing the distance between the measurement point and the second axis when the measurement is initiated and a sixth parameter for characterizing the distance between the measurement point and the first axis.

27. A communication device comprising a processor and interface circuitry for receiving signals from or transmitting signals from other communication devices than the communication device to the processor, the processor being operable to implement the method of any one of claims 1 to 13 by logic circuitry or executing code instructions.

28. A communication device comprising a processor coupled to a memory for storing instructions that, when executed by the processor, cause the communication device to perform the method of any of claims 1-13.

29. A computer readable storage medium having stored therein instructions which, when executed by a communication device, implement the method of any of claims 1 to 13.

30. A computer program product, characterized in that it, when run on a computer, causes the computer to perform the method according to any one of claims 1 to 9.

31. A system on a chip, comprising a processor for invoking and running a computer program from memory, causing a device on which the system on a chip is installed to perform the method of any of claims 1-13.

32. A communication system comprising at least one communication device for performing the method of any of claims 1 to 13 and a non-terrestrial network NTN.