CN114600506B - A cell search method and terminal - Google Patents

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

A cell search 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 technique

In related technologies, when a terminal is in the RRC connection state but a problem occurs such as handover failure, wireless link failure, integrity protection failure, or RRC reconfiguration failure, the terminal is triggered to perform a cell search and initiate a cell search in the searched target cell. RRC connection reestablishment process.

Currently, 3GPP is studying Non Terrestrial Network (NTN, non-terrestrial communication network) technology. NTN generally uses satellite communication to provide communication services to ground users. In the satellite communication system, because the cells detected by the terminal are mobile and not stationary like traditional cells; at the same time, because in satellite communications, the air interface transmission delay is relatively large, the RRC connection reestablishment delay is also will be relatively large. Therefore, if the same method as in related technologies is used for cell search, the problem of long service interruption delay may occur.

Contents of the invention

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

The terminal is in the radio resource control RRC connection state. If the first preset condition is met, the terminal searches for the target cell according to the ephemeris information;

The terminal initiates an RRC connection reestablishment process to the target communication device of the target cell.

In the second aspect, a terminal is provided, including:

The communication unit is in the radio resource control RRC connection state, and when the first preset condition is met, searches for the target cell according to the ephemeris information; and initiates an RRC connection reestablishment process to the target communication device 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 to store computer programs, and the processor is used to call and run the computer program stored in the memory to perform steps of the foregoing method.

In a fourth aspect, a chip is provided, including: a processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes the foregoing method.

In a fifth aspect, a computer-readable storage medium is provided, the computer-readable storage medium being used to store a computer program, the computer program causing the computer to perform steps of the foregoing method.

In a sixth aspect, a computer program product is provided, including computer program instructions, which cause a computer to perform the aforementioned method.

In a seventh aspect, a computer program is provided, the computer program causing a computer to perform the aforementioned method.

By adopting the above solution, if the terminal meets the first preset condition when it is in the RRC connected state, it will search for the target cell based on the ephemeris information of the satellite, and then initiate the RRC re-establishment process to the target cell. In this way, the ephemeris information can be combined to assist the search processing of the target cell, thereby avoiding the problem of long service interruption delay caused by the satellite moving too fast and still using the frequency point or identification to search for the cell in related technologies. , can determine possible target cells through ephemeris information, allowing the terminal to search for the target cell as quickly as possible in the NTN scenario and initiate the RRC reconstruction process, improving the processing efficiency of the terminal.

Description of the drawings

Figure 1 is a schematic diagram 1 of a communication system architecture provided by an embodiment of the present application;

Figure 2 is a schematic flow chart 1 of a cell search method provided by an embodiment of the present application;

Figure 3 is a schematic flow chart 2 of a cell search method provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of a terminal provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of a communication device provided by an embodiment of the present invention;

Figure 6 is a schematic block diagram of a chip provided by an embodiment of the present application;

Figure 7 is a schematic diagram 2 of a communication system architecture provided by an embodiment of the present application.

Detailed ways

In order to understand the characteristics and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (Code Division Multiple Access, CDMA) system, Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (Time Division Duplex, TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system or 5G system, etc.

By way of example, the communication system 100 applied in the embodiment of the present application may be as shown in Figure 1 . The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a UE 120 (also known as a communication terminal device, terminal device). Network device 110 may provide communications coverage for a specific geographic area and may communicate with UEs located within the coverage area. Optionally, 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, or an evolved network device in an LTE system. The network equipment (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (Cloud Radio Access Network, CRAN), or the network equipment can be a mobile switching center, relay station, access point, vehicle Equipment, wearable devices, hubs, switches, bridges, routers, network side equipment in 5G networks or network equipment in future evolved Public Land Mobile Networks (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one UE 120 located within the coverage of the network device 110 . As used herein, "UE" includes, but is not limited to, connections via wired lines, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connections; and /or another data connection/network; and/or via a wireless interface, e.g. for cellular networks, Wireless Local Area Network (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcasts A transmitter; and/or a device of another UE configured to receive/transmit communication signals; and/or an Internet of Things (IoT) device. A UE configured to communicate through a wireless interface may be referred to as a "wireless communication terminal device", a "wireless terminal device" or a "mobile terminal device".

Optionally, terminal device direct connection (Device to Device, D2D) communication can be performed between UEs 120.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is just an association relationship that describes related objects, indicating that three relationships can exist. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and they exist alone. B these three situations. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In order to understand the characteristics and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

The embodiments provided in this application can be applied to Non Terrestrial Network (NTN, non-terrestrial communication network). Among them, the NTN uses satellite communication to provide communication services to ground users. Compared with terrestrial cellular network communications, satellite communications have many unique advantages. First of all, satellite communication is not restricted by the user's geographical area. For example, general land communication cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be installed or where communication coverage is not available due to sparse population. However, for satellite communication, due to a satellite Satellites can cover a large area of the ground, and satellites can orbit the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communications have great social value. Satellite communications can cover remote mountainous areas and poor and backward countries or regions at a lower cost, allowing people in these areas to enjoy advanced voice communications and mobile Internet technologies, which is conducive to narrowing the digital divide with developed regions and promoting development in these areas. Thirdly, satellite communication has a long distance, and the cost of communication does not increase significantly as the communication distance increases; finally, satellite communication has high stability and is not restricted by natural disasters.

Communication satellites are divided into LEO (Low-Earth Orbit, low Earth orbit) satellites, MEO (Medium-Earth Orbit, medium Earth orbit) satellites, GEO (Geostationary Earth Orbit, geosynchronous orbit) satellites, HEO (High Earth Orbit) satellites according to different orbital altitudes. Elliptical Orbit, highly elliptical orbit) satellite, etc. in,

LEO, the altitude range of low-orbit satellites is 500km~1500km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between users is generally less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is small, and the transmission power requirements of the user terminal are not high.

GEO, a geosynchronous orbit satellite, has an orbital altitude of 35,786km and a rotation period of 24 hours around the earth. The signal propagation delay for single-hop communication between users is generally 250ms.

In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. One satellite can form dozens or even hundreds of beams to cover the ground; one satellite beam can cover dozens to hundreds of kilometers in diameter. Ground area.

Based on the foregoing architecture, embodiments of the present invention provide a cell search method, as shown in Figure 2, including:

Step 21: The terminal is in a Radio Resource Control (RRC) connection state. If the first preset condition is met, the terminal searches for the target cell according to the ephemeris information;

Step 22: The terminal initiates an RRC connection reestablishment process to the target communication device of the target cell.

The communication device (target communication device or source communication device) in this embodiment may be a satellite. The types of satellites have been explained previously and will not be repeated here.

The first preset condition includes at least one of the following:

Hand-Over Failure (HOF, Hand-Over Failure) occurs in the terminal; Radio Link Failure (RLF) occurs in the terminal; Integrity protection failure occurs in the terminal; RRC reconfiguration failure occurs in the terminal.

Of course, the first preset condition may also include other situations, and any situation that requires RRC re-establishment may be included in the foregoing first preset condition, and no exhaustive list will be made here.

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

The ephemeris information corresponding to the source serving cell may be the ephemeris information corresponding to the satellite (that is, the source communication device) of the source serving cell; the ephemeris information corresponding to the adjacent cells of the source serving cell may be the ephemeris information of the source serving cell. Ephemeris information of satellites (that is, communication equipment) of adjacent cells.

It should be noted that the neighboring cells of the source serving cell may be one or more. Correspondingly, the ephemeris information corresponding to the neighboring cells of the source serving cell may be satellites (communications) of one or more neighboring cells. One or more ephemeris information corresponding to the device).

The ephemeris information is: the source communication device of the source serving cell sends it to the terminal through system broadcast; for example, the ephemeris information can be carried in MIB or SIB;

Alternatively, the source communication device of the source serving cell is configured to the terminal through dedicated signaling. Alternatively, the ephemeris information may be carried in MAC CE and RRC signaling.

The source serving cell of the terminal is: the last serving cell when the terminal meets the first preset condition. That is, when the terminal meets the first preset condition, the serving cell to which the terminal is connected or located is the last serving cell, that is, the source serving cell. For example, if a handover fails when the terminal is connected to the source serving cell, then the source serving cell is the last serving cell to which the terminal is connected if it meets the first preset condition. Other situations are similar and will not be described again.

Wherein, the ephemeris information may be ephemeris data, also known as ephemeris, which is a star orbit parameter table, that is, a list of data is used to describe the scheduled location of a star at certain intervals, or at regular intervals. Time is the scheduled location of an artificial satellite.

Once communication equipment, such as satellites, spacecraft or aircraft enters space, it will be included in the NORAD ephemeris information number catalog. Space objects listed in NORAD's ephemeris information catalog will be tracked for life.

The satellite's ephemeris information uses the mathematical relationship between the six orbital parameters of Kepler's law to determine the time, coordinates, orientation, speed and other parameters of the flying object, with extremely high accuracy. Satellite ephemeris information can accurately calculate, predict, depict, and track the time, position, speed and other operating status of satellites and flying objects; it can express the precise parameters of celestial bodies, satellites, spacecrafts, missiles, space junk and other flying objects; it can The flying object is placed in a three-dimensional space; the past, present and future of the celestial body are depicted three-dimensionally with time. The time of the satellite's ephemeris information is calculated in Coordinated Universal Time (UTC). Moreover, the ephemeris information of the satellite can be updated regularly. The update method can be that once parameters are added or parameters are adjusted, the ephemeris information can be updated accordingly; or an update cycle can be set, such as 1 month, or 1 day, or 3 months, etc. , the satellite's ephemeris information is updated according to this update cycle.

The two-line track data format given by 3GPP TR38.821 contains the information shown in Table 1 below:

Table 1 (First line of the ephemeris)

Table 2: (Second row)

It can be seen that based on the aforementioned Tables 1 and 2, the terminal can obtain the movement trajectory of the ephemeris information of the source communication device, that is, the last connected serving satellite.

Similarly, as described above, the source communication device can send ephemeris information corresponding to the source serving cell to the terminal, or ephemeris information corresponding to the source communication device (that is, satellite) called the source serving cell; it can also send to the terminal For the ephemeris information of the adjacent cell, it can be understood that the source communication device sends the ephemeris information of the communication satellite (communication device) of the adjacent cell to the terminal.

So far, in the solution provided by this embodiment, the terminal has been able to obtain the ephemeris information corresponding to the source communication device of the source serving cell, and the ephemeris information corresponding to the communication device of at least one adjacent cell.

Next, combined with the ephemeris information obtained above, we will further describe how the terminal performs target cell selection and search processing:

First, when the terminal determines that the first preset condition is met, a timer is started.

The timer may be used to control RRC re-establishment.

That is to say, once the terminal determines that one of handover failure, wireless link failure, integrity protection failure, or RRC reconfiguration failure has occurred, the timer can be started.

The duration of the timer can be configured for the terminal by the source communication device of the source serving cell. For example, it can be configured through system information (system broadcast), or it can be configured for the terminal through signaling such as RRC, MAC CE, etc. I won’t be exhaustive here. Alternatively, the duration of the timer may also be determined by the terminal itself according to the protocol.

Then, the terminal processing method also includes:

The terminal determines a candidate cell based on at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the adjacent cell, and the current value of the timer; wherein the candidate cell is the terminal's predetermined within its coverage area;

The terminal searches the candidate cells according to the relevant information of the candidate cells, and uses the searched candidate cells as target cells.

In addition, in addition to at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the adjacent cell, and the current value of the timer, the terminal can also combine the current area or location to determine Select candidate cells. Among them, the current area or location of the terminal can be identified based on the geographical location or coverage of the terminal's source cell, or to be more precise, the terminal can obtain its own longitude and latitude (which may also include altitude) through its own GPS module.

The aforementioned determination of candidate cells may include determining one or more candidate cells; and then the terminal may obtain relevant information of one or more candidate cells.

Wherein, the relevant information of the candidate cell includes at least one of the following: 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 based on at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the adjacent cell, and the current value of the timer. The candidate cell list may include relevant information of the one or more candidate cells.

For example, based on the current value of the timer and the ephemeris information corresponding to at least one neighboring cell, the terminal determines whether the coverage of any communication device of at least one neighboring cell will cover the terminal at the current moment. , if so, use this cell as a candidate cell; until all candidate cells are selected.

Alternatively, the terminal can determine whether the coverage of any adjacent cell includes its own location or area based on the current value of the timer, the current location, and the ephemeris information corresponding to the adjacent cells. If so, it will be used as One candidate cell until all candidate cells are selected.

Alternatively, the terminal can also determine whether the coverage of any cell will include the current value of the timer, the current location or area, and the ephemeris information corresponding to the adjacent cells and the ephemeris information corresponding to the source serving cell. The location or area of the terminal itself, if any, is used as a candidate cell until all candidate cells are selected.

The terminal searches the candidate cell according to the relevant information of the candidate cell, and uses the searched candidate cell as the target cell. It can be understood that the terminal detects at least one based on the identifier and/or frequency point of the candidate cell. The signal strength of a candidate cell (can be understood as detecting the reference signal strength of at least one candidate cell), and the candidate cell with the strongest signal strength is used as the target cell. Then an RRC connection reestablishment process is initiated to the target cell.

Wherein, using the searched candidate cell as the target cell also includes:

If the terminal searches for the candidate cell and the candidate cell satisfies the S criterion, the candidate cell is used as the target cell.

That is to say, if the terminal searches for a candidate cell with the largest reference signal strength that satisfies the S criterion, then the candidate cell with the largest reference signal strength is used as the target cell.

The S criterion is a criterion for determining whether the terminal device can access the target cell. The S criterion can be expressed by the following formula:

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

Among them, Qrxlevmeas represents the RSRP value of the target cell measured by the terminal device, in dBm;

Qrxlevmin is the first received signal quality threshold value; specifically, it can be the minimum receiving intensity requirement of RSRP in the target cell, in dBm.

Qrxlevminoffset is the offset value. Since Srxlev is used to evaluate the cell quality when residing on the VPLMN and searching for high-priority PLMNs, Qrxlevmin needs to be offset. Used to prevent the ping-pong effect.

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

When the terminal selects a cell, it obtains the Qrxlevmeas value of the cell through measurement, obtains other parameters in the S criterion formula through the cell's system information and its own capability level, calculates Srxlex, and then compares it with 0. If Srxlex>0, the terminal If the cell is considered to meet the channel quality requirements for cell selection, it can be selected as the resident cell. If the system information of the cell broadcasts that it is allowed to camp, the terminal will choose to camp on this cell and enter the idle state.

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

That is to say, after the terminal searches for the candidate cell with the strongest reference signal strength among one or more candidate cells, it uses the S criterion to determine whether the candidate cell with the strongest reference signal strength is allowed to access. If it is allowed, the candidate cell with the strongest reference signal strength is allowed to access. The candidate cell with the strongest signal strength is used as the target cell.

Further, if the candidate cell with the strongest reference signal strength searched by the terminal does not satisfy the S criterion, the terminal determines whether the candidate cell with the second strongest reference signal strength satisfies the S criterion. If it does, select the candidate cell with the second strongest reference signal strength. The candidate cell is used as the target cell, and so on, until the target cell is selected.

Or, if a cell that meets the requirements cannot be selected within the preset time period, the terminal can re-search, select one or more candidate cells again, and then select the target cell from the one or more candidate cells selected again.

The preset duration can be implemented by another timer, which will not be described here.

It should be pointed out that once it is determined that the candidate cell with the strongest signal strength satisfies the S criterion, the aforementioned timer can be stopped.

Finally, the solution provided by this embodiment is illustrated in conjunction with Figure 3:

When the terminal is in the RRC connection state but encounters problems such as handover failure, wireless link failure, integrity protection failure, or RRC reconfiguration failure, it will search for the target cell for RRC connection reestablishment based on ephemeris information, including:

Step 31: The terminal starts timer T1; specifically, the terminal starts the timer T1 when handover failure, wireless link failure, integrity protection failure, or RRC reconfiguration failure occurs.

Step 32: The terminal triggers a cell search. At this time, the terminal performs a cell search based on the ephemeris information of the satellite corresponding to the last serving cell before failure (that is, the source serving cell), and/or the current value of T1, and/or other ephemeris information. (that is, the ephemeris information of adjacent cells), determine the candidate cell information that may be in its coverage at this time, such as cell identification information and/or frequency point information, and search for the cells.

Step 33: If a candidate cell is found and the cell satisfies the S criterion, stop the timer T1.

It should also be pointed out that if the terminal does not search for a candidate cell, it can keep searching until a candidate cell that meets the requirements is searched; or it can be controlled by a timer. For example, when the aforementioned timer T1 stops, it still cannot be found. Candidate cell, then it is determined that RRC reconstruction cannot be performed; of course, another timer can be used, such as timer T2 for control. Its start time can be the same as T1, and the timing length can be different from T1, for example, it can be shorter than T1. Of course, It can also be longer than T1, there is no limit here.

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

It can be seen that by adopting the above solution, if the terminal meets the first preset condition when it is in the RRC connected state, it will search for the target cell based on the ephemeris information of the satellite, and then initiate the RRC re-establishment process to the target cell. In this way, the ephemeris information can be combined to assist the search processing of the target cell, thereby avoiding the problem of long service interruption delay caused by the satellite moving too fast and still using the frequency point or identification to search for the cell in related technologies. , can determine possible target cells through ephemeris information, allowing the terminal to search for the target cell as quickly as possible in the NTN scenario and initiate the RRC reconstruction process, improving the processing efficiency of the terminal.

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

The communication unit 41 is in a radio resource control (RRC, Radio Resource Control) connection state. When the first preset condition is met, the terminal searches for the target cell according to the ephemeris information; and initiates a request to the target communication device of the target cell. RRC connection reestablishment process.

The communication device (target communication device or source communication device) in this embodiment may be a satellite. The types of satellites have been explained previously and will not be repeated here.

The first preset condition includes at least one of the following:

Hand-Over Failure (HOF, Hand-Over Failure) occurs in the terminal; Radio Link Failure (RLF) occurs in the terminal; Integrity protection failure occurs in the terminal; RRC reconfiguration failure occurs in the terminal.

Of course, the first preset condition may also include other situations, and any situation that requires RRC re-establishment may be included in the foregoing first preset condition, and no exhaustive list will be made here.

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

The ephemeris information corresponding to the source serving cell may be the ephemeris information corresponding to the satellite (that is, the source communication device) of the source serving cell; the ephemeris information corresponding to the adjacent cells of the source serving cell may be the ephemeris information of the source serving cell. Ephemeris information of satellites (that is, communication equipment) of adjacent cells.

It should be noted that the neighboring cells of the source serving cell may be one or more. Correspondingly, the ephemeris information corresponding to the neighboring cells of the source serving cell may be satellites (communications) of one or more neighboring cells. One or more ephemeris information corresponding to the device).

The ephemeris information is: the source communication device of the source serving cell sends it to the terminal through system broadcast; for example, the ephemeris information can be carried in MIB or SIB;

Alternatively, the source communication device of the source serving cell is configured to the terminal through dedicated signaling. Alternatively, the ephemeris information may be carried in MAC CE and RRC signaling.

The source serving cell of the terminal is: the last serving cell when the terminal meets the first preset condition.

Wherein, the ephemeris information may be ephemeris data, also known as ephemeris, which is a star orbit parameter table, that is, a list of data is used to describe the scheduled location of a star at certain intervals, or at regular intervals. Time is the scheduled location of an artificial satellite.

Next, combined with the ephemeris information obtained above, we will further describe how the terminal performs target cell selection and search processing:

The terminal also includes: a processing unit 42 that starts a timer when it is determined that the first preset condition is met.

The duration of the timer can be configured for the terminal by the source communication device of the source serving cell. For example, it can be configured through system information (system broadcast), or it can be configured for the terminal through signaling such as RRC, MAC CE, etc. I won’t be exhaustive here. Alternatively, the duration of the timer may also be determined by the terminal itself according to the protocol.

Then, the processing unit 42 determines the candidate cell according to at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the adjacent cell, and the current value of the timer; wherein the candidate cell is The terminal predicts a cell within its coverage;

The communication unit 41 searches the candidate cells according to the relevant information of the candidate cells, and uses the searched candidate cells as target cells.

In addition, in addition to at least one of the ephemeris information corresponding to the source serving cell, the ephemeris information corresponding to the adjacent cell, and the current value of the timer, the processing unit 42 can also combine the current area or the current value of the timer. location to select candidate cells. Among them, the current area or location of the terminal can be identified based on the geographical location or coverage of the terminal's source cell, or to be more precise, the terminal can obtain its own longitude and latitude (which may also include altitude) through its own GPS module.

The aforementioned determination of candidate cells may include determining one or more candidate cells; and then the terminal may obtain relevant information of one or more candidate cells.

Wherein, the relevant information of the candidate cell includes at least one of the following: identification information of the candidate cell and frequency point information of the candidate cell.

Wherein, if the communication unit 41 searches for the candidate cell and the candidate cell satisfies the S criterion, the candidate cell will be used as the target cell.

That is to say, after searching for the candidate cell with the strongest reference signal strength among one or more candidate cells, the communication unit 41 determines whether the candidate cell with the strongest reference signal strength is allowed to access through the S criterion. If it is allowed, then The candidate cell with the strongest signal strength is used as the target cell.

Further, if the candidate cell with the strongest reference signal strength searched by the communication unit 41 does not satisfy the S criterion, then the terminal determines whether the candidate cell with the second strongest reference signal strength satisfies the S criterion. If it does, select the reference signal strength The second strongest candidate cell is used as the target cell, and so on, until the target cell is selected.

Or, if a cell that meets the requirements cannot be selected within the preset time period, the search can be re-selected, one or more candidate cells are selected again, and the target cell is selected from the one or more candidate cells selected again.

The preset duration can be implemented by another timer, which will not be described here.

It should be noted that once it is determined that the candidate cell with the strongest signal strength satisfies the S criterion, the processing unit 42 can stop the aforementioned timer.

It can be seen that by adopting the above solution, if the terminal meets the first preset condition when it is in the RRC connected state, it will search for the target cell based on the ephemeris information of the satellite, and then initiate the RRC re-establishment process to the target cell. In this way, the ephemeris information can be combined to assist the search processing of the target cell, thereby avoiding the problem of long service interruption delay caused by the satellite moving too fast and still using the frequency point or identification to search for the cell in related technologies. , can determine possible target cells through ephemeris information, allowing the terminal to search for the target cell as quickly as possible in the NTN scenario and initiate the RRC reconstruction process, improving the processing efficiency of the terminal.

Figure 5 is a schematic structural diagram of a communication device 500 provided by an embodiment of the present invention. The communication device in this embodiment can be specifically the terminal or satellite in the previous embodiment. The communication device 500 shown in Figure 5 includes a processor 510. The processor 510 can call and run a computer program from the memory to implement the method in the embodiment of the present invention.

Optionally, as shown in FIG. 5 , the communication device 500 may also include a memory 520 . The processor 510 can call and run the computer program from the memory 520 to implement the method in the embodiment of the present invention.

The memory 520 may be a separate device independent of the processor 510 , or may be integrated into the processor 510 .

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

Among them, the transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include an antenna, and the number of antennas may be one or more.

Optionally, the communication device 500 may be a terminal according to the embodiment of the present invention, and the communication device 500 may implement the corresponding processes implemented by the network device in the various methods of the embodiment of the present invention. For the sake of brevity, details are not repeated here.

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

Optionally, as shown in FIG. 6 , the chip 600 may also include a memory 620 . The processor 610 can call and run the computer program from the memory 620 to implement the method in the embodiment of the present invention.

The memory 620 may be a separate device independent of 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 can control the input interface 630 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.

Optionally, the chip 600 may also include an output interface 640. The processor 610 can control the output interface 640 to communicate with other devices or chips. Specifically, it can output information or data to other devices or chips.

Optionally, the chip can be applied to the terminal in the embodiment of the present invention, and the chip can implement the corresponding processes implemented by the satellite in each method of the embodiment of the present invention. For the sake of brevity, the details will not be described again.

It should be understood that the chip mentioned in the embodiment of the present invention may also be called a system-on-chip, a system-on-a-chip, a system-on-a-chip or a system-on-chip, etc.

It should be understood that the processor in the embodiment of the present invention may be an integrated circuit chip and has signal processing capabilities. During the implementation process, each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software. The above-mentioned processor can 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 processors. Logic devices, discrete gate or transistor logic devices, discrete hardware components. Each method, step and logical block diagram disclosed in the embodiment of the present invention can be implemented or executed. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present invention can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of illustration, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synchlink DRAM, SLDRAM) and direct memory bus random access memory (DirectRambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

It should be understood that the above memory is illustrative but not restrictive. For example, the memory in the embodiment of the present invention can also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is, memories in embodiments of the present invention are intended to include, but are not limited to, these and any other suitable types of memories.

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

Among them, the satellite 710 can be used to implement the corresponding functions implemented by the communication device in the above method, and the terminal 720 can be used to implement the corresponding functions implemented by the terminal in the above method. For the sake of brevity, details will not be described here.

Embodiments of the present invention also provide a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium can be applied to network equipment or satellites in embodiments of the present invention, and the computer program causes the computer to execute corresponding processes implemented by the network equipment in various methods of embodiments of the present invention. For simplicity, I won’t go into details here.

An embodiment of the present invention also provides a computer program product, including computer program instructions.

Optionally, the computer program product can be applied to the network equipment or satellite in the embodiment of the present invention, and the computer program instructions cause the computer to execute the corresponding processes implemented by the network equipment in the various methods of the embodiment of the present invention. For simplicity, in This will not be described again.

An embodiment of the present invention also provides a computer program.

Optionally, the computer program can be applied to network equipment or satellites in embodiments of the present invention. When the computer program is run on a computer, it causes the computer to execute corresponding processes implemented by the network equipment in various methods of embodiments of the present invention. For the sake of brevity, no further details will be given here.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered to be beyond the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code. .

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (19)

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;

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

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.

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:

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

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:

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.

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:

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

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.