CN114600506B

CN114600506B - Cell searching method and terminal

Info

Publication number: CN114600506B
Application number: CN202080075186.0A
Authority: CN
Inventors: 王淑坤; 李海涛; 尤心
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2023-09-26
Anticipated expiration: 2040-01-22
Also published as: CN114600506A; WO2021147004A1

Abstract

The invention discloses a cell searching method, a terminal, a chip, a computer readable storage medium, a computer program product and a computer program, wherein the method comprises the following steps: the terminal is in a Radio Resource Control (RRC) connection state, and searches a target cell according to ephemeris information under the condition that a first preset condition is met; and the terminal initiates an RRC connection reestablishment process to target communication equipment of the target cell.

Description

Cell searching method and terminal

Technical Field

The present invention relates to the field of communications, and in particular, to a cell search method, a terminal, a chip, a computer readable storage medium, a computer program product, and a computer program.

Background

In the related art, when a terminal is in an RRC connection state and a handover failure, or a radio link failure, or an integrity protection failure, or an RRC reconfiguration failure occurs, the terminal is triggered to perform cell search to initiate an RRC connection reestablishment procedure in a searched target cell.

Currently, 3GPP is researching Non Terrestrial Network (NTN, non-terrestrial communication network) technology, where NTN generally provides communication services to terrestrial users by way of satellite communication. In satellite communication systems, since the cell detected by the terminal is mobile, it is not stationary as in conventional cells; meanwhile, in satellite communication, the air interface transmission delay is relatively large, so that the RRC connection reestablishment delay is relatively large. Therefore, if the cell search is performed by the same method as in the related art, there is a possibility that a problem of a long service interruption delay occurs.

Disclosure of Invention

To solve the above technical problems, embodiments of the present invention provide a cell search method, a terminal, a chip, a computer readable storage medium, a computer program product, and a computer program.

In a first aspect, a cell search method is provided, including:

the terminal is in a Radio Resource Control (RRC) connection state, and searches a target cell according to ephemeris information under the condition that a first preset condition is met;

and the terminal initiates an RRC connection reestablishment process to target communication equipment of the target cell.

In a second aspect, there is provided a terminal comprising:

the communication unit is in a Radio Resource Control (RRC) connection state, and searches for a target cell according to ephemeris information under the condition that a first preset condition is met; and initiating an RRC connection reestablishment process to target communication equipment of the target cell.

In a third aspect, a terminal is provided, including: a processor and a memory for storing a computer program capable of running on the processor,

wherein the memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the steps of the method.

In a fourth aspect, a chip is provided, comprising: and a processor for calling and running the computer program from the memory, so that the device on which the chip is mounted performs the method as described above.

In a fifth aspect, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the steps of the method as described above.

In a sixth aspect, a computer program product is provided comprising computer program instructions for causing a computer to perform the method as described above.

In a seventh aspect, a computer program is provided, which causes a computer to perform the method as described above.

By adopting the scheme, if the terminal meets the first preset condition under the condition of being in the RRC connection state, searching the target cell according to the ephemeris information of the satellite, and then initiating an RRC reestablishment process to the target cell. Therefore, the method and the device can assist the search processing of the target cell by combining the ephemeris information, so that the problem that the service interruption time delay is long due to the fact that the satellite moves too fast and the cell search is carried out by frequency points or marks in the related technology is solved, the possible target cell can be determined by the ephemeris information, the terminal can search the target cell as soon as possible in an NTN scene and initiate the RRC reconstruction process, and the processing efficiency of the terminal is improved.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a cell search method according to an embodiment of the present application;

fig. 3 is a schematic flow chart II of a cell search method according to an embodiment of the present application;

fig. 4 is a schematic diagram of a terminal composition structure according to an embodiment of the present application;

fig. 5 is a schematic diagram of a communication device according to an embodiment of the present application;

FIG. 6 is a schematic block diagram of a chip provided by an embodiment of the application;

fig. 7 is a schematic diagram of a communication system architecture according to an embodiment of the present application.

Detailed Description

For a more complete understanding of the nature and the technical content of the embodiments of the present application, reference should be made to the following detailed description of embodiments of the application, taken in conjunction with the accompanying drawings, which are meant to be illustrative only and not limiting of the embodiments of the application.

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The technical scheme of the embodiment of the application can be applied to various communication systems, such as: global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) systems, general packet radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) systems, LTE frequency division duplex (Frequency Division Duplex, FDD) systems, LTE time division duplex (Time Division Duplex, TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wiMAX) communication systems, or 5G systems, and the like.

By way of example, a communication system 100 to which embodiments of the present application may be applied may be as shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with the UE120 (or referred to as a communication terminal device, terminal device). Network device 110 may provide communication coverage for a particular geographic area and may communicate with UEs located within that coverage area. Alternatively, the network device 110 may be a network device (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a network device (NodeB, NB) in a WCDMA system, an evolved network device (Evolutional Node B, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud wireless access network (Cloud Radio Access Network, CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network-side device in a 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one UE120 located within the coverage area of the network device 110. "UE" as used herein includes, but is not limited to, connection via wireline, such as via public-switched telephone network (Public Switched Telephone Networks, PSTN), digital subscriber line (Digital Subscriber Line, DSL), digital cable, direct cable connection; and/or another data connection/network; and/or via a wireless interface, e.g., for a cellular network, a wireless local area network (Wireless Local Area Network, WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and/or means of another UE arranged to receive/transmit communication signals; and/or internet of things (Internet of Things, ioT) devices. UEs arranged to communicate over a radio interface may be referred to as "wireless communication terminal devices", "wireless terminal devices" or "mobile terminal devices".

Optionally, a Device-to-Device (D2D) communication may be performed between UEs 120.

It should be understood that the terms "system" and "network" are used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The embodiment provided by the application can be applied to Non Terrestrial Network (NTN, non-terrestrial communication network). The NTN provides communication service for ground users in a satellite communication mode. Satellite communications have many unique advantages over terrestrial cellular communications. First, satellite communications are not limited by the user region, for example, general land communications cannot cover areas where communication devices cannot be installed, such as oceans, mountains, deserts, etc., or communication coverage is not performed due to rarity of population, while for satellite communications, since one satellite can cover a larger ground, and the satellite can orbit around the earth, theoretically every corner on the earth can be covered by satellite communications. And secondly, satellite communication has great social value. Satellite communication can be covered in remote mountain areas, poor and backward countries or regions with lower cost, so that people in the regions enjoy advanced voice communication and mobile internet technology, and the digital gap between developed regions is reduced, and the development of the regions is promoted. Again, the satellite communication distance is far, and the cost of communication is not obviously increased when the communication distance is increased; and finally, the satellite communication has high stability and is not limited by natural disasters.

Communication satellites are classified into LEO (Low-Earth Orbit) satellites, MEO (Medium-Earth Orbit) satellites, GEO (Geostationary Earth Orbit, geosynchronous Orbit) satellites, HEO (High Elliptical Orbit ) satellites, and the like according to the difference in Orbit heights. Wherein, the liquid crystal display device comprises a liquid crystal display device,

LEO, low orbit satellite altitude range is 500 km-1500 km, and corresponding orbit period is about 1.5 hours-2 hours. The signal propagation delay for single hop communications between users is typically less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is less, and the requirement on the transmitting power of the user terminal is not high.

GEO, geosynchronous orbit satellite, orbit altitude 35786km, rotation period around the earth 24 hours. The signal propagation delay for single hop communications between users is typically 250ms.

In order to ensure the coverage of the satellite and improve the system capacity of the whole satellite communication system, the satellite adopts multiple beams to cover the ground, and one satellite can form tens or hundreds of beams to cover the ground; a satellite beam may cover a ground area of several tens to hundreds of kilometers in diameter.

Based on the foregoing architecture, an embodiment of the present invention provides a cell search method, as shown in fig. 2, including:

Step 21: the terminal is in a radio resource control (RRC, radio Resource Control) connection state, and searches a target cell according to ephemeris information under the condition that a first preset condition is met;

step 22: and the terminal initiates an RRC connection reestablishment process to target communication equipment of the target cell.

The communication device (target communication device or source communication device) in this embodiment may be a satellite. The foregoing description of the type of satellite is omitted here.

The first preset condition includes at least one of:

the terminal generates a handover Failure (HOF); the terminal experiences Radio Link Failure (RLF); the terminal fails in integrity protection; the terminal fails in RRC reconfiguration.

Of course, the first preset condition may also include other cases, and any case where RRC reestablishment is required may be included in the foregoing first preset condition, which is not exhaustive herein.

The ephemeris information may include: ephemeris information corresponding to the source serving cell and/or ephemeris information corresponding to neighboring cells of the source serving cell.

The ephemeris information corresponding to the source service cell may be ephemeris information corresponding to a satellite (i.e. source communication device) of the source service cell; the ephemeris information corresponding to the neighboring cell of the source serving cell may be ephemeris information of a satellite (i.e., a communication device) of the neighboring cell of the source serving cell.

It should be noted that, the neighboring cells of the source serving cell may be one or more, and accordingly, the ephemeris information corresponding to the neighboring cells of the source serving cell may be one or more ephemeris information corresponding to satellites (communication devices) of one or more neighboring cells.

The ephemeris information is: source communication equipment of a source service cell is broadcast and sent to the terminal through a system; for example, the ephemeris information may be carried in MIB or SIB;

or the source communication equipment of the source service cell is configured to the terminal through special signaling. Alternatively, the ephemeris information may be carried in MAC CE, RRC signaling.

The source service cell of the terminal is: and the terminal accords with the last service cell under the condition of the first preset condition. The service cell to which the terminal is connected or is in is the last service cell, namely the source service cell, under the condition that the terminal accords with the first preset condition. For example, when the terminal is connected to the source serving cell, a handover failure occurs, and the source serving cell is the last serving cell to which the terminal is connected when the terminal meets the first preset condition, and other cases are similar to the last serving cell and are not described again.

The ephemeris information may be ephemeris data (ephemeris data), which is also called an ephemeris, and is a star orbit parameter table, that is, list data is used to indicate the preset position of a certain star at regular intervals or the preset position of a certain artificial satellite at regular intervals.

Communication devices, such as satellites, spacecraft or flying bodies, are listed in the NORAD ephemeris information numbering directory once in space. The space vehicles listed in the NORAD ephemeris information numbering list will be tracked for lifetime.

The ephemeris information of the satellite determines various parameters such as time, coordinates, azimuth, speed and the like of the flying body according to the mathematical relationship among 6 orbit parameters of kepler law, and has extremely high precision. The ephemeris information of the satellite can accurately calculate, predict, draw, track the running states of the satellite, time, position, speed and the like of the flying body; the precise parameters of flying bodies such as celestial bodies, satellites, spacecrafts, missiles, space garbage and the like can be expressed; the flying body can be placed in a three-dimensional space; the past, present and future of celestial bodies are depicted in time-stereo. The time of ephemeris information of a satellite is calculated in terms of Universal Time (UTC). And, the ephemeris information of the satellite may be updated periodically. The updating mode can be that once the parameters are added or the parameters are adjusted, the ephemeris information can be correspondingly updated; alternatively still, an update period, such as 1 month, or 1 day, or 3 months, or the like, may be set, and the ephemeris information of the satellite is updated according to the update period.

The two-row track data format given by 3gpp tr38.821 contains information as shown in table 1 below:

table 1 (first Planet calendar, first line of the ephemeris)

Table 2: (second row)

It can be seen that, based on the foregoing tables 1 and 2, the terminal can obtain the content such as the motion trail of the ephemeris information of the source communication device, that is, the last connected service satellite.

Also, as described above, the source communication device may transmit ephemeris information corresponding to the source serving cell, or ephemeris information corresponding to the source communication device (i.e., satellite) called the source serving cell, to the terminal; the ephemeris information of the neighboring cell may also be transmitted to the terminal, and it may be understood that the source communication device transmits the ephemeris information of the communication satellite (communication device) of the neighboring cell to the terminal.

In this way, in the solution provided in this embodiment, the terminal can already obtain the ephemeris information corresponding to the source communication device of the source serving cell and the ephemeris information of the communication device corresponding to at least one neighboring cell.

The following describes further how the terminal performs the process of target cell selection and search in conjunction with the ephemeris information obtained as described above:

firstly, when the terminal determines that the first preset condition is met, starting a timer.

Wherein the timer may be used to control RRC reestablishment.

That is, the terminal may start the timer upon determining one of handover failure, radio link failure, integrity protection failure, and RRC reconfiguration failure.

The duration of the timer may be configured for the terminal by the source communication device of the source serving cell, for example, may be configured by system information (system broadcast), or may be configured for the terminal by signaling such as RRC, MAC CE, and the like, which is not exhaustive herein. Alternatively, the duration of the timer may also be determined by the terminal itself according to a protocol.

Then, the processing method of the terminal further includes:

the terminal determines candidate cells according to at least one of ephemeris information corresponding to a source service cell, ephemeris information corresponding to a neighboring cell and a current value of the timer; the candidate cells are cells in which the terminal pre-judges the coverage area;

and the terminal searches the candidate cell according to the related information of the candidate cell, and takes the searched candidate cell as a target cell.

In addition, the terminal may select the candidate cell by combining the current area or the location, in addition to at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the neighboring cell, and the current value of the timer. The current area or the current location of the terminal can be identified according to the geographic location or coverage area of the terminal source cell, or more precisely, the terminal can obtain the longitude and latitude (including the altitude) of the terminal through the GPS module of the terminal, and the like.

The determining the candidate cells may be determining one or more candidate cells; the terminal may then obtain information about one or more candidate cells.

Wherein the information related to the candidate cell includes at least one of: identification information of the candidate cell and frequency point information of the candidate cell.

In other words, the terminal may determine a candidate cell list according to at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the neighboring cell, and the current value of the timer. The candidate cell list may include information about the one or more candidate cells.

For example, the terminal determines whether any coverage area of the communication equipment of at least one neighboring cell will be covered to the terminal at the current moment according to the current value of the timer and the ephemeris information corresponding to the at least one neighboring cell, and if so, the cell is used as a candidate cell; until all candidate cells are selected.

Or, the terminal may determine whether any coverage area of the neighboring cells will include its own location or area according to the current value and the current location of the timer and the ephemeris information corresponding to the neighboring cells, and if so, the terminal may serve as a candidate cell until all candidate cells are selected.

Or, the terminal may further determine whether there is a coverage area of any one cell, which may include the location or the area of the terminal itself, according to the current value, the current location or the area of the timer, the ephemeris information corresponding to the neighboring cell, and the ephemeris information corresponding to the source serving cell, and if so, use the coverage area as a candidate cell until all candidate cells are selected.

The terminal searches the candidate cells according to the related information of the candidate cells, and takes the searched candidate cells as target cells, which can be understood that the terminal detects the signal strength of at least one candidate cell (which can be understood as detecting the reference signal strength of at least one candidate cell) according to the identification and/or the frequency point of the candidate cells, and takes the candidate cell with the strongest signal strength as the target cell. And then initiating an RRC connection reestablishment procedure to the target cell.

Wherein, the taking the searched candidate cell as the target cell further includes:

and the terminal searches the candidate cell, and the candidate cell meets the S criterion, and takes the candidate cell as the target cell.

That is, if the terminal searches that the candidate cell with the maximum reference signal strength satisfies the S criterion, the candidate cell with the maximum reference signal strength is taken as the target cell.

The S criterion is a criterion for judging whether the terminal equipment can access the target cell. The S criterion may be expressed using the following formula:

Srxlev＝Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation-Qoffsettemp；

wherein, qrxlevmeas represents the RSRP value of a terminal device measurement target cell, and the unit is dBm;

qrxlevmin, which is the first received signal quality threshold; the minimum receiving strength requirement of the RSRP in the target cell can be specifically expressed in dBm.

Qrxlevminoffset is an offset value since when camping on a VPLMN searching for a high priority PLMN, an offset to Qrxlevmin is required to evaluate cell quality using Srxlev. For preventing ping-pong effects.

Pcompensation may be Max (PEMAX-PUMAX, 0), in dB; wherein, PEMAX is the maximum uplink transmitting power allowed by the terminal in the cell, the unit dBm can be obtained from the broadcast message; PUMAX is the maximum uplink transmit power, in dBm, determined by the terminal capability.

When the terminal selects a cell, the terminal obtains the Qrxlevmeas value of the cell through measurement, obtains other parameters in an S criterion formula through the system information and the self capacity level of the cell, calculates to obtain Srxlex, then compares the Srxlex with 0, and if the Srxlex is more than 0, the terminal considers that the cell meets the channel quality requirement of cell selection and can select the cell as a resident cell. If the system information of the cell is broadcast that it is allowed to camp on, the terminal will choose to camp on this cell and enter an idle state.

If it is determined based on the foregoing calculation that Srxlex of the target cell is not greater than 0, the terminal device is not allowed to camp on the target cell or is not allowed to access the target cell, otherwise the terminal is allowed to access the target cell.

That is, after searching for a candidate cell with the strongest reference signal strength from the one or more candidate cells, the terminal determines whether the candidate cell with the strongest reference signal strength is allowed to be accessed according to an S criterion, and if so, takes the candidate cell with the strongest reference signal strength as the target cell.

Further, if the candidate cell with the strongest reference signal strength searched by the terminal does not meet the S criterion, the terminal judges whether the candidate cell with the second strongest reference signal strength meets the S criterion, if so, the candidate cell with the second strongest reference signal strength is selected as the target cell, and so on until the target cell is selected.

Or if the cell meeting the requirement cannot be selected within the preset time, the terminal can search again, select one or more candidate cells again, and select the target cell from the one or more candidate cells again.

The preset duration may be implemented by another timer, which is not described herein.

It should be noted that the aforementioned timer may be stopped once it is determined that the candidate cell with the strongest reference signal strength satisfies the S criterion.

Finally, the scheme provided in this embodiment is exemplarily described with reference to fig. 3:

when the terminal is in the RRC connection state and has a problem in the situations of switching failure, radio link failure, integrity protection failure, RRC reconfiguration failure and the like, searching a target cell for RRC connection reestablishment according to ephemeris information assistance, wherein the method comprises the following steps:

step 31: the terminal starts a timer T1; specifically, when the terminal has a handover failure, or a radio link failure, or an integrity protection failure, or an RRC reconfiguration failure, the timer T1 is started.

Step 32: the terminal triggers to execute cell search, at this time, the terminal judges candidate cell information, such as cell identification information and/or frequency point information, which may be in coverage of the terminal at this time, according to ephemeris information of a satellite corresponding to a last serving cell (i.e., source serving cell) before failure, and/or a current value of T1, and/or ephemeris information of other neighboring cells (i.e., ephemeris information of neighboring cells), and searches cells.

Step 33: if a candidate cell is searched and the cell meets the S criterion, the timer T1 is stopped.

It should also be noted that if the terminal does not search for a candidate cell, the search may be maintained until a candidate cell meeting the requirements is searched; or, the control may be performed by a timer, for example, when the timer T1 is stopped, the candidate cell cannot be found, and then it is determined that RRC reestablishment cannot be performed; of course, another timer, such as timer T2, may be used to control, and the on time may be the same as T1, and the timing duration may be different from T1, such as may be shorter than T1, and of course may be longer than T1, which is not limited herein.

Step 34: the terminal initiates an RRC connection reestablishment process to the target communication equipment of the target cell.

By adopting the scheme, if the terminal is in the RRC connection state and accords with the first preset condition, searching the target cell according to the ephemeris information of the satellite, and then initiating an RRC reestablishment process to the target cell. Therefore, the method and the device can assist the search processing of the target cell by combining the ephemeris information, so that the problem that the service interruption time delay is long due to the fact that the satellite moves too fast and the cell search is carried out by frequency points or marks in the related technology is solved, the possible target cell can be determined by the ephemeris information, the terminal can search the target cell as soon as possible in an NTN scene and initiate the RRC reconstruction process, and the processing efficiency of the terminal is improved.

An embodiment of the present invention provides a terminal, as shown in fig. 4, including:

a communication unit 41 in a radio resource control (RRC, radio Resource Control) connected state, and in case that the first preset condition is met, the terminal searches for a target cell according to ephemeris information; and initiating an RRC connection reestablishment process to target communication equipment of the target cell.

The first preset condition includes at least one of:

The source service cell of the terminal is: and the terminal accords with the last service cell under the condition of the first preset condition.

the terminal further comprises: and the processing unit 42 starts a timer when the first preset condition is determined to be met.

Then, the processing unit 42 determines a candidate cell according to at least one of ephemeris information corresponding to the source serving cell, ephemeris information corresponding to the neighboring cell, and a current value of the timer; the candidate cells are cells in which the terminal pre-judges the coverage area;

the communication unit 41 searches the candidate cell according to the related information of the candidate cell, and uses the searched candidate cell as a target cell.

In addition, the processing unit 42 may select the candidate cell in combination with the current area or the location, in addition to at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the neighboring cell, and the current value of the timer. The current area or the current location of the terminal can be identified according to the geographic location or coverage area of the terminal source cell, or more precisely, the terminal can obtain the longitude and latitude (including the altitude) of the terminal through the GPS module of the terminal, and the like.

Wherein the communication unit 41 searches for the candidate cell and the candidate cell satisfies an S criterion, takes the candidate cell as the target cell.

That is, the communication unit 41, after searching for the candidate cell with the strongest reference signal strength among the one or more candidate cells, determines whether the candidate cell with the strongest reference signal strength is allowed to be accessed by the S criterion, and if so, takes the candidate cell with the strongest reference signal strength as the target cell.

Further, if the communication unit 41 searches for the candidate cell with the strongest reference signal strength, and does not meet the S criterion, the terminal determines whether the candidate cell with the second strongest reference signal strength meets the S criterion, if so, selects the candidate cell with the second strongest reference signal strength as the target cell, and so on until the target cell is selected.

Or if the cell meeting the requirements cannot be selected within the preset time, searching can be conducted again, one or more candidate cells are selected again, and the target cell is selected from the one or more candidate cells selected again.

It is noted that the processing unit 42 may stop the aforementioned timer upon determining that the candidate cell with the strongest reference signal strength meets the S criterion.

Fig. 5 is a schematic block diagram of a communication device 500 according to an embodiment of the present invention, which may be specifically a terminal or a satellite in the foregoing embodiment. The communication device 500 shown in fig. 5 comprises a processor 510, from which the processor 510 may call and run a computer program to implement the method in an embodiment of the invention.

Optionally, as shown in fig. 5, the communication device 500 may further comprise a memory 520. Wherein the processor 510 may call and run a computer program from the memory 520 to implement the method in an embodiment of the invention.

Wherein the memory 520 may be a separate device from the processor 510 or may be integrated into the processor 510.

Optionally, as shown in fig. 5, the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices, and in particular, may send information or data to other devices, or receive information or data sent by other devices.

Wherein the transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include antennas, the number of which may be one or more.

Optionally, the communication device 500 may be a terminal in the embodiment of the present invention, and the communication device 500 may implement a corresponding flow implemented by a network device in each method in the embodiment of the present invention, which is not described herein for brevity.

Fig. 6 is a schematic structural diagram of a chip of an embodiment of the present invention. The chip 600 shown in fig. 6 includes a processor 610, and the processor 610 may call and run a computer program from a memory to implement the method in the embodiment of the present invention.

Optionally, as shown in fig. 6, the chip 600 may further include a memory 620. Wherein the processor 610 may call and run a computer program from the memory 620 to implement the method in an embodiment of the invention.

The memory 620 may be a separate device from the processor 610 or may be integrated into the processor 610.

Optionally, the chip 600 may also include an input interface 630. The processor 610 may control the input interface 630 to communicate with other devices or chips, and in particular, may acquire information or data sent by the other devices or chips.

Optionally, the chip 600 may further include an output interface 640. Wherein the processor 610 may control the output interface 640 to communicate with other devices or chips, and in particular, may output information or data to other devices or chips.

Optionally, the chip may be applied to the terminal in the embodiment of the present invention, and the chip may implement a corresponding flow implemented by a satellite in each method in the embodiment of the present invention, which is not described herein for brevity.

It should be understood that the chips referred to in the embodiments of the present invention may also be referred to as system-on-chip chips, or the like.

It should be appreciated that the processor of an embodiment of the present invention may be an integrated circuit chip having signal processing capabilities. 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 (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (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 invention 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 invention 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.

It will be appreciated that the memory in embodiments of the invention may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memory is illustrative but not restrictive, and for example, the memory in the embodiments of the present application may be Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct RAM (DR RAM), and the like. That is, the memory in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

Fig. 7 is a schematic block diagram of a communication system 700 provided in an embodiment of the present application. As shown in fig. 7, the communication system 700 includes a satellite 710 and a terminal 720.

The satellite 710 may be used to implement the corresponding functions implemented by the communication device in the above method, and the terminal 720 may be used to implement the corresponding functions implemented by the terminal in the above method, which are not described herein for brevity.

The embodiment of the invention also provides a computer readable storage medium for storing a computer program.

Optionally, the computer readable storage medium may be applied to a network device or a satellite in the embodiment of the present invention, and the computer program causes a computer to execute a corresponding flow implemented by the network device in each method of the embodiment of the present invention, which is not described herein for brevity.

The embodiment of the invention also provides a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to a network device or a satellite in the embodiment of the present invention, and the computer program instructions cause a computer to execute a corresponding procedure implemented by the network device in each method in the embodiment of the present invention, which is not described herein for brevity.

The embodiment of the invention also provides a computer program.

Optionally, the computer program may be applied to a network device or a satellite in the embodiment of the present invention, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the network device in each method in the embodiment of the present invention, which is not described herein for brevity.

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 invention.

It will be clear to 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, and are not repeated herein.

In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., 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 an indirect coupling or communication connection via some interfaces, devices or units, which may be in 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 invention 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 invention 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 invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present invention, and the present invention 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 invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cell search method, comprising:

the terminal is in a Radio Resource Control (RRC) connection state, and searches a target cell according to ephemeris information and a position of the terminal under the condition that a first preset condition is met, wherein the first preset condition comprises at least one of the following: the terminal fails to switch, the terminal fails to perform integrity protection, and the terminal fails to perform RRC reconfiguration, and the ephemeris information includes: ephemeris information corresponding to the source service cell and ephemeris information corresponding to the neighboring cell of the source service cell;

2. The method of claim 1, wherein the ephemeris information is:

source communication equipment of a source service cell is broadcast and sent to the terminal through a system;

Or the source communication equipment of the source service cell is configured to the terminal through special signaling.

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

and the terminal starts a timer when determining that the first preset condition is met.

4. A method according to claim 3, wherein the terminal searches for a target cell based on ephemeris information and the location of the terminal, comprising:

the terminal determines candidate cells according to the ephemeris information corresponding to the source service cell, the ephemeris information corresponding to the adjacent cells, the current value of the timer and the position of the terminal; the candidate cells are cells in which the terminal pre-judges the coverage area;

5. The method of claim 4, wherein the candidate cell related information comprises at least one of:

identification information of the candidate cell and frequency point information of the candidate cell.

6. The method of claim 5, wherein the serving the searched candidate cell as a target cell further comprises:

7. The method of claim 6, wherein the method further comprises:

and stopping the timer when the terminal determines that the candidate cell meets the S criterion.

8. The method of claim 1, wherein the source serving cell of the terminal is: and the terminal accords with the last service cell under the condition of the first preset condition.

9. A terminal, comprising:

the communication unit is in a Radio Resource Control (RRC) connection state, and searches a target cell according to ephemeris information and the position of the terminal under the condition that the first preset condition is met; initiating an RRC connection reestablishment procedure to a target communication device of the target cell, wherein the first preset condition includes at least one of: the terminal fails to switch, the terminal fails to perform integrity protection, and the terminal fails to perform RRC reconfiguration, and the ephemeris information includes: ephemeris information corresponding to the source serving cell and ephemeris information corresponding to neighboring cells of the source serving cell.

10. The terminal of claim 9, wherein the ephemeris information is:

11. The terminal according to claim 9 or 10, wherein the terminal further comprises:

and the processing unit starts a timer when the first preset condition is met.

12. The terminal of claim 11, wherein the processing unit determines candidate cells according to ephemeris information corresponding to a source serving cell, ephemeris information corresponding to a neighboring cell, a current value of the timer, and a location of the terminal; the candidate cells are cells in which the terminal pre-judges the coverage area;

and the communication unit searches the candidate cell according to the related information of the candidate cell, and takes the searched candidate cell as a target cell.

13. The terminal of claim 12, wherein the candidate cell related information comprises at least one of:

14. The terminal according to claim 13, wherein the communication unit searches for the candidate cell and the candidate cell satisfies S criteria, and regards the candidate cell as the target cell.

15. The terminal of claim 14, wherein the processing unit stops the timer when it is determined that the candidate cell satisfies an S criterion.

16. The terminal of claim 9, wherein the source serving cell is: and the terminal accords with the last service cell under the condition of the first preset condition.

17. A terminal, comprising: a processor and a memory for storing a computer program capable of running on the processor,

wherein the memory is adapted to store a computer program, said processor being adapted to invoke and run the computer program stored in said memory, performing the steps of the method according to any of claims 1-8.

18. A chip, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method of any of claims 1-8.

19. A computer readable storage medium for storing a computer program which causes a computer to perform the steps of the method according to any one of claims 1-8.