Switching method and device, communication equipment and computer readable storage medium

Abstract

Disclosed are a switching method and apparatus, a communication device, and a computer readable storage medium, the method comprising: a terminal receiving a first configuration message sent by a first base station, the first configuration message comprising a configuration of at least one candidate cell, the configuration of the candidate cell comprising an event associated with the candidate cell, the event associated with the candidate cell is related to the quality change trend of the candidate cell; wherein the event associated with the candidate cell is used for the terminal to perform switching evaluation of the candidate cell.

Description

Technical Field

[0001] This application relates to the field of wireless technologies, and in particular, to a handover method and apparatus, a communication device, and a computer-readable storage medium. Background Art

[0002] An important process in a wireless communication system is handover. To ensure the reliability and low latency of handover, the 3rd Generation Partnership Project (3GPP) has discussed various handover enhancement solutions, such as the Conditional Handover (CHO) solution, the L1 / L2 Triggered Mobility (LTM) solution, etc.

[0003] Base stations and / or terminals have mobility scenarios, which will result in large fluctuations and delays in the communication links between base stations and between base stations and terminals. For the existing CHO mechanism, the handover conditions sent by the base station may not be accurate enough; for the existing LTM mechanism, the Layer 1 (L1) measurement results of the terminal may be affected by the severely changing communication links, resulting in frequent handovers. Summary of the Invention

[0004] To solve the above technical problems, embodiments of this application provide a handover method and apparatus, a communication device, a chip, a computer-readable storage medium, and a computer program product.

[0005] The handover method provided by embodiments of this application includes:

[0006] A terminal receives a first configuration message sent by a first base station, where the first configuration message includes configurations of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to a quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0007] The handover method provided by embodiments of this application includes:

[0008] A first base station sends a first configuration message to a terminal, where the first configuration message includes configurations of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to a quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0009] The handover apparatus provided by embodiments of this application is applied to a terminal, and the apparatus includes:

[0010] A first communication unit, configured to receive a first configuration message sent by a first base station, where the first configuration message includes configurations of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to a quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0011] The handover device provided by an embodiment of the present application is applied to a first base station, and the device includes:

[0012] A second communication unit, configured to send a first configuration message to a terminal, where the first configuration message includes configurations of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to a quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0013] The communication device provided by an embodiment of the present application includes: a processor and a memory, where the memory is used to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute any one of the above handover methods.

[0014] The chip provided by an embodiment of the present application includes: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes any one of the above handover methods.

[0015] The computer-readable storage medium provided by an embodiment of the present application is used to store a computer program, and the computer program enables a computer to execute any one of the above handover methods.

[0016] The computer program product provided by an embodiment of the present application includes computer program instructions, and the computer program instructions enable a computer to execute any one of the above handover methods.

[0017] The technical solution of the embodiment of the present application proposes a handover method. In this handover method, the network side (i.e., the first base station) configures an event associated with a candidate cell for the terminal, and this event is used for the terminal to perform handover evaluation of the candidate cell. It can be understood that this event is the handover condition of the candidate cell; this event is related to the quality change trend of the candidate cell, so that in a scenario with future mobility characteristics, the handover triggered based on this event can adapt to the mobility requirements and improve the accuracy and efficiency of the handover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of an application scenario of an embodiment of the present application;

[0019] Figure 2(a) is a schematic diagram of a mobility scenario;

[0020] Figure 2(b) is another schematic diagram of a mobility scenario;

[0021] Figure 2(c) is yet another schematic diagram of a mobility scenario;

[0022] Figure 3 is a schematic diagram of an LTM handover process;

[0023] Figure 4 is a flowchart of the handover method provided by the embodiments of the present application Figure 1 ;

[0024] Figure 5 is a schematic diagram of the measurement information calibration process provided by the embodiments of the present application;

[0025] Figure 6 is a schematic diagram of the MAC CE format provided by the embodiments of the present application Figure 1 ;

[0026] Figure 7 is the second schematic diagram of the MAC CE format provided by the embodiments of the present application;

[0027] Figure 8 is a schematic diagram of the MAC CE format provided by the embodiments of the present application Figure 3 ;

[0028] Figure 9 is the second flowchart of the handover method provided by the embodiments of the present application;

[0029] Figure 10 is a flowchart of the handover method provided by the embodiments of the present application Figure 3 ;

[0030] Figure 11 is a schematic diagram of the mobility scenario provided by the embodiments of the present application;

[0031] Figure 12 is a flowchart of the handover method provided by the embodiments of the present application Figure 4 ;

[0032] Figure 13 is a schematic diagram of the MAC CE format provided by the embodiments of the present application Figure 4 ;

[0033] Figure 14 is a schematic diagram of the MAC CE format provided by the embodiments of the present application Figure 5 ;

[0034] Figure 15 is a schematic diagram of the structural composition of the handover device provided by the embodiments of the present application Figure 1 ;

[0035] Figure 16 It is the second schematic diagram of the structural composition of the switching device provided by the embodiment of the present application;

[0036] Figure 17 It is a schematic structural diagram of a communication device provided by the embodiment of the present application;

[0037] Figure 18 It is a schematic structural diagram of the chip of the embodiment of the present application. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be described 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, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] Figure 1 It is a schematic diagram of an application scenario of the embodiment of the present application.

[0040] As Figure 1 shown, the communication system 100 may include a terminal 110 and a network device 120. The network device 120 may communicate with the terminal 110 through the air interface.

[0041] It should be understood that the embodiments of the present application are only exemplarily described by taking the communication system 100 as an example, but the embodiments of the present application are not limited thereto. That is to say, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: 5G communication systems (also known as New Radio (NR) communication systems), or future communication systems, etc.

[0042] In Figure 1 the shown communication system 100, the network device 120 may be an access network device that communicates with the terminal 110. The access network device may provide communication coverage for a specific geographical area and may communicate with the terminal 110 (such as a UE) located within the coverage area.

[0043] The network device 120 may be a base station (gNB) in the NR system or a network device in a future evolved Public Land Mobile Network (PLMN), etc.

[0044] The terminal 110 can be any terminal. For example, the terminal 110 can refer to an access terminal, a user equipment (UE), a user unit, a user station, a mobile station, a mobile platform, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, an IoT device, a satellite handheld terminal, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device, or other processing devices connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a 5G network, or a terminal in a future evolved network, etc.

[0045] Figure 1 Exemplarily, a base station and two terminals are shown. Optionally, the wireless communication system 100 may include multiple base station devices, and the coverage range of each base station may include other numbers of terminals. The embodiments of the present application do not limit this.

[0046] It should be noted that Figure 1The system applicable to the present application is only schematically shown by way of example. Of course, the method shown in the embodiments of the present application can also be applicable to other systems. In addition, the terms "system" and "network" in this article are often used interchangeably. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects. It should also be understood that the "indication" mentioned in the embodiments of the present application can be a direct indication, an indirect indication, or a representation of an association relationship. For example, A indicates B, which can mean that A directly indicates B. For example, B can be obtained through A; it can also mean that A indirectly indicates B. For example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B. It should also be understood that the "correspondence" mentioned in the embodiments of the present application can represent a direct or indirect corresponding relationship between the two, can also represent an association relationship between the two, or can be an indication and being indicated, configuration and being configured, etc. relationships. It should also be understood that the "predefined" or "predefined rule" mentioned in the embodiments of the present application can be implemented by pre-saving corresponding codes, tables or other means that can be used to indicate relevant information in a device (for example, including a terminal and a network device). The present application does not limit its specific implementation manner. For example, the predefined can refer to what is defined in the protocol. It should also be understood that in the embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field. For example, it can include the NR protocol and related protocols applied to future communication systems. The present application does not limit this.

[0047] The base station and / or the terminal have mobility scenarios. Figures 2(a), 2(b), and 2(c) schematically show three mobility scenarios. As shown in Figure 2(a), in this mobility scenario, the terminal is mobile, the base stations 1 and 2 are fixed, and the terminal moves from A to B along the trajectory pointed by the arrow; the terminal is closer to the base station 1 at position A and closer to the base station 2 at position B. As shown in Figure 2(b), in this mobility scenario, the base stations 1, 2, and the terminal are all mobile, and the terminal moves from A to B along the trajectory pointed by the arrow; the terminal is closer to the base station 1 at position A and closer to the base station 2 at position B. As shown in Figure 2(c), in this mobility scenario, the base stations 1 and 2 are mobile and the terminal is fixed.

[0048] Exemplarily, the terminal with mobility can be a mobile phone, a car, etc. The base station with mobility can be a drone, a satellite, an aerial platform, etc.

[0049] Due to the mobility scenarios of the base station and / or the terminal, this will result in significant fluctuations and delays in the communication links between base stations and between the base station and the terminal. For the existing CHO mechanism, the handover conditions sent by the base station may not be accurate enough; for the existing LTM mechanism, the L1 measurement results of the terminal may be affected by the severely changing communication links, resulting in frequent handovers. For example, in the mobility scenario shown in Figure 2(a), the terminal moves from A to B, and there are two potential target base stations (Base Station 1 and Base Station 2) for handover; according to the traditional handover process, the source base station mainly sends measurement configuration and handover decisions to the terminal based on the channel quality conditions of the terminal. The terminal will have a high probability of handing over to the cell of Base Station 1 at point A and then handing over to the cell of Base Station 2 at point B, causing frequent handovers. In fact, if the channel quality at point A meets certain conditions, the terminal can also directly hand over to the cell of Base Station 2 at point A. It can be seen that the current handover method cannot meet the handover requirements of the terminal for low latency and high reliability in the mobility scenario. Therefore, the following technical solutions of the embodiments of the present application are proposed.

[0050] The technical solution of the embodiments of the present application proposes a conditional handover method triggered by L1 measurement results, which can also be described as a conditional handover method based on L1 measurement trigger, or a conditional handover method based on L1 trigger, or a conditional handover method, or a handover method.

[0051] To facilitate the understanding of the technical solution of the embodiments of the present application, the LTM handover process will be described first below. The LTM handover process can be understood as a handover process triggered by L1 measurement results.

[0052] Figure 3 is a schematic diagram of the LTM handover process, as Figure 3 shown, this process includes the following steps:

[0053] Step 301: The source base station sends LTM measurement configuration to the terminal.

[0054] Step 302: The terminal performs L1 measurement based on the LTM measurement configuration and reports the L1 measurement results to the source base station.

[0055] Step 303: The source base station makes a handover decision based on the L1 measurement results reported by the terminal.

[0056] Step 304: The source base station sends a cell handover command to the terminal through the Media Access Control (MAC) Control Element (CE).

[0057] Step 305: The terminal performs a random access process to the target base station.

[0058] The technical solution of the embodiment of the present application introduces a conditional handover mechanism on the basis of the LTM handover process to implement a conditional handover process triggered by L1 measurement results.

[0059] Figure 4 It is a schematic flow chart of the handover method provided by the embodiment of the present application Figure 1 , such as Figure 4 shown, the handover method includes the following steps:

[0060] Step 401: The first base station sends a first configuration message to the terminal, and the terminal receives the first configuration message sent by the first base station. The first configuration message includes the configuration of at least one candidate cell. The configuration of the candidate cell includes the event associated with the candidate cell, and the event associated with the candidate cell is related to the quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0061] The first base station in the embodiment of the present application can also be described as the source base station or the serving base station.

[0062] In the embodiment of the present application, the terminal receives the first configuration message sent by the first base station, and the first configuration message includes the configuration of at least one candidate cell.

[0063] In some embodiments, the first configuration message can also be described as an RRC reconfiguration message.

[0064] In some embodiments, the configuration of the candidate cell can also be described as the LTM conditional handover configuration of the candidate cell, or can also be described as the conditional handover configuration.

[0065] In the embodiment of the present application, the configuration of the candidate cell includes the handover condition of the candidate cell. Here, the handover condition of the candidate cell is the event associated with the candidate cell, and the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0066] In the embodiment of the present application, the event associated with the candidate cell is related to the quality change trend of the candidate cell.

[0067] In some embodiments, the triggering condition of the event associated with the candidate cell is: the first quality change value is greater than or equal to the first threshold. Here, the first quality change value is determined based on the quality increment of the candidate cell corresponding to the first time point, the quality increment of the candidate cell corresponding to the second time point, and the offset of the quality increment of the candidate cell.

[0068] In one example, the triggering condition of the event can be represented by the following formula (1):

[0069] M Δ (t2)-M Δ(t1)-HysM>ThreshM (1)

[0070] where t1 represents the first time point, and M Δ (t1) represents the quality increment of the candidate cell corresponding to the first time point; t2 represents the second time point, and M Δ (t2) represents the quality increment of the candidate cell corresponding to the second time point, and t2 > t1; HysM represents the bias of the quality increment of the candidate cell; ThreshM represents the first threshold value.

[0071] In some embodiments, the leaving condition of the event associated with the candidate cell is that the second quality change value is less than or equal to the second threshold value, where the second quality change value is determined based on the quality increment of the candidate cell corresponding to the first time point, the quality increment of the candidate cell corresponding to the second time point, and the bias of the quality increment of the candidate cell. Here, the second threshold value may be the same as the first threshold value, or the second threshold value may also be different from the first threshold value.

[0072] In one example, the triggering condition of the event can be represented by the following formula (2):

[0073] M Δ (t2)-M Δ (t1)+HysM<ThreshM (2)

[0074] where t1 represents the first time point, and M Δ (t1) represents the quality increment of the candidate cell corresponding to the first time point; t2 represents the second time point, and M Δ (t2) represents the quality increment of the candidate cell corresponding to the second time point, and t2 > t1; HysM represents the bias of the quality increment of the candidate cell; ThreshM represents the second threshold value, and the second threshold value is the same as the first threshold value.

[0075] In the above solution, the quality increment of the candidate cell corresponding to the first time point / second time point can be calculated by the following formula (3):

[0076] M Δ (t n )=M(t n )-M(t n -T) (3)

[0077] where M Δ (t n ) represents the quality increment of the candidate cell corresponding to the time point t n ; M(t n ) represents the beam quality result of the candidate cell corresponding to the time point t n ; M(t n -T) represents the time point tn The beam quality result of the candidate cell corresponding to -T, where T is the single measurement period configured by the network device. According to formula (3), the quality increment M of the candidate cell corresponding to the first time point can be obtained. Δ M(t1) is equal to M(t1) - M(t1 - T), and the quality increment M of the candidate cell corresponding to the second time point Δ (t2) is equal to M(t2) - M(t2 - T).

[0078] In some embodiments, the above-mentioned first threshold, second threshold, and the bias of the quality increment are configured by the first base station according to a specific frequency (frequency specific), or a specific cell (cell specific), or a specific UE type (UEtype specific), or a specific NB type (NB type specific).

[0079] Here, for different frequencies / cells / UE types / NB types, the network device (i.e., the first base station) can configure the same or different first thresholds / second thresholds / biases of the quality increment.

[0080] For example: HysM in the above formulas (1) and (2) can be a bias related to a specific frequency, or a specific cell, or a specific UE type, or a specific NB type. Generally, HysM is set to a positive value (i.e., greater than 0).

[0081] For example: ThreshM in the above formulas (1) and (2) can be a threshold related to a specific frequency, or a specific cell, or a specific UE type, or a specific NB type. Generally, ThreshM is set to a positive value (i.e., greater than 0), and has the same unit as M(t n ).

[0082] Step 402: When the terminal determines that the event associated with the first candidate cell is triggered based on the first configuration message, the terminal performs a handover to the first candidate cell, and the first candidate cell belongs to at least one candidate cell.

[0083] In the embodiments of the present application, the terminal determines whether an event associated with a candidate cell is triggered among at least one candidate cell based on the first configuration message; if the terminal determines that the event associated with the first candidate cell is triggered, the terminal considers that the handover condition of the first candidate cell is satisfied, regards the first candidate cell as the target cell for handover, and performs a handover to the target cell.

[0084] In step 402, the terminal needs to perform handover evaluation, that is, to determine whether the event associated with the candidate cell is triggered. During the handover evaluation process of the terminal, the terminal measures the candidate cell to obtain the quality of the candidate cell, and then determines whether the event associated with the candidate cell is triggered according to the quality of the candidate cell in combination with the above formula (1). If the above formula (1) is satisfied, the event associated with the candidate cell is triggered; if the above formula (1) is not satisfied, the event associated with the candidate cell is not triggered.

[0085] To improve the accuracy of handover evaluation, it is necessary to calibrate the measurement information of the terminal. Here, the measurement information refers to the cell quality and beam quality obtained by the terminal when measuring the candidate cell.

[0086] Figure 5 is a schematic diagram of the measurement information calibration process provided by an embodiment of the present application. As Figure 5 shown, the calibration process includes the following steps:

[0087] Step 501: The terminal sends a measurement calibration request to the first base station, and the first base station receives the measurement calibration request sent by the terminal. This measurement calibration request is used to request the first base station to calibrate the measurement information.

[0088] In some embodiments, the measurement calibration request is carried in the first MAC CE, and the first MAC CE includes one or more of the following information:

[0089] The first information is used to identify the measurement calibration request.

[0090] The second information is used to identify the cell corresponding to the measurement information for which the terminal requests calibration.

[0091] The third information is used to identify the type of measurement information for which the terminal requests calibration.

[0092] The fourth information is used to identify the measurement information for which the terminal requests calibration.

[0093] In one example, as Figure 6 shown, Figure 6 illustrates a new MAC CE format (i.e., the format of the first MAC CE). Among them:

[0094] 1) The calibration request identifier corresponds to the first information and is used to identify the measurement calibration request. The terminal can request the first base station to calibrate one or more measurement information. For the case of multiple measurement information, different measurement information corresponds to different calibration request identifiers.

[0095] 3) The cell ID corresponds to the second information and is used to identify the cell corresponding to the measurement information for which the terminal requests calibration. The terminal can request the first base station to respond with the calibration result associated with this cell through the cell ID.

[0096] 4) The calibration type corresponds to the third information and is used to identify the type of the measurement information for which the terminal requests calibration. Examples of the type of measurement information include: the quality of the cell, the moving speed of the terminal, the moving direction of the terminal, the location of the terminal, etc. Exemplarily, the calibration type is represented by 2-bit information, where 00 is used to identify that the calibration type is the quality of the cell, 01 is used to identify that the calibration type is the moving speed of the terminal, 10 is used to identify that the calibration type is the moving direction of the terminal, and 11 is used to identify that the calibration type is the location of the terminal.

[0097] 5) The request calibration information corresponds to the fourth information and is used to identify the measurement information for which the terminal requests calibration.

[0098] Step 502: The first base station sends a measurement calibration response to the terminal, and the terminal receives the measurement calibration response sent by the first base station. This measurement calibration response corresponds to the measurement calibration request.

[0099] In some embodiments, the measurement calibration response is carried in the second MAC CE, and the second MAC CE includes one or more of the following information:

[0100] The first information, which is used to identify the measurement calibration request;

[0101] The fifth information, which is used to identify the calibration feedback result of the first base station on the measurement information;

[0102] The sixth information, which is used to identify the calibration increment information of the first base station on the measurement information.

[0103] In one example, as Figure 7 shown, Figure 7 illustrates a new MAC CE format (i.e., the format of the second MAC CE). Among them:

[0104] 1) The calibration request identifier corresponds to the first information and is used to identify the measurement calibration request. The calibration request identifier in the second MAC CE corresponds to the calibration request identifier in the first MAC CE.

[0105] 2) The calibration feedback corresponds to the fifth information and is used to identify the calibration feedback result of the first base station on the measurement information. The value of the calibration feedback can be A or N; if the value of the calibration feedback is A, it means that the first base station confirms that the measurement information requested by the terminal is accurate; if the value of the calibration feedback is N, it means that the first base station negates that the measurement information requested by the terminal is accurate;

[0106] 3) The calibration increment information corresponds to the sixth information and is used to identify the calibration increment information of the first base station for the measurement information. When the value of the calibration feedback is N, the first base station provides the calibration increment information, which is used to calibrate the measurement information requested by the terminal.

[0107] In some embodiments, the measurement calibration response is carried in the third MAC CE, and the third MAC CE includes one or more of the following information:

[0108] The first information, which is used to identify the measurement calibration request;

[0109] The second information, which is used to identify the cell corresponding to the measurement information for which the terminal requests calibration;

[0110] The seventh information, which is used to identify the measurement configuration corresponding to the measurement information for which the terminal requests calibration;

[0111] The eighth information, which is used to identify the calibration configuration information of the first base station for the measurement configuration.

[0112] In an example, as Figure 8 shown, Figure 8 a new MAC CE format (i.e., the format of the third MAC CE) is illustrated. Among them:

[0113] 1) The calibration request identifier corresponds to the first information and is used to identify the measurement calibration request. The calibration request identifier in the third MAC CE corresponds to the calibration request identifier in the first MAC CE.

[0114] 2) The cell ID corresponds to the second information and is used to identify the cell corresponding to the measurement information for which the terminal requests calibration. The cell ID in the third MAC CE corresponds to the cell ID in the first MAC CE.

[0115] 3) The measurement configuration ID corresponds to the seventh information and is used to identify the measurement configuration corresponding to the measurement information for which the terminal requests calibration.

[0116] 4) The calibration configuration information corresponds to the eighth information and is used to identify the calibration configuration information of the first base station for the measurement configuration. The first base station calibrates the measurement configuration by providing the calibration configuration information of the measurement configuration, so as to achieve the purpose of calibrating the measurement information.

[0117] Step 503: The terminal calibrates the measurement information based on the measurement calibration response.

[0118] Here, the terminal can obtain the calibration increment information of the measurement information based on the measurement calibration response, and calibrate the measurement information according to the calibration increment information, so as to improve the accuracy of the measurement information.

[0119] In some embodiments, the terminal adds calibration increment information to the measurement information to calibrate the measurement information. In other embodiments, the terminal subtracts calibration increment information from the measurement information to calibrate the measurement information.

[0120] In some embodiments, before step 501, the first base station interacts with the core network to obtain measurement assistance information. Specifically:

[0121] 1) The first base station sends a measurement calibration service request to a core network element. The measurement calibration service request is used to request measurement assistance information from the core network element.

[0122] In some embodiments, the measurement calibration service request carries at least one of the following pieces of information: terminal type, measurement methods supported by the terminal.

[0123] 2) The first base station receives a measurement calibration service response sent by the core network element. The measurement calibration service response corresponds to the measurement calibration service request.

[0124] In some embodiments, the above-mentioned measurement calibration service response carries measurement assistance information. In other embodiments, the above-mentioned measurement calibration service response does not carry measurement assistance information. After the first base station receives the measurement calibration service response sent by the core network element, the first base station receives the measurement assistance information sent by the core network element.

[0125] In some embodiments, the measurement assistance information includes the mobility information of the terminal and / or the mobility information of other base stations. Here, the other base stations refer to candidate base stations related to handover other than the first base station, and the number of other base stations can be one or more. The mobility information includes at least one of the following pieces of information: positioning assistance information, moving speed assistance information, moving direction assistance information. Here, the positioning assistance information is obtained by the core network element in real time / predicting the position of the terminal or other base stations. The moving speed assistance information is obtained by the core network element in real time / predicting the moving speed of the terminal or other base stations. The moving direction assistance information is obtained by the core network element in real time / predicting the moving direction of the terminal or other base stations.

[0126] 3) The first base station calibrates the measurement information requested by the terminal based on the measurement assistance information.

[0127] Here, the first base station calibrates the measurement information requested by the terminal based on the measurement assistance information. Specifically, the first base station determines whether the measurement information requested by the terminal is accurate based on the measurement assistance information, and generates a calibration feedback result based on the determination result. The value of the calibration feedback can be A or N. If the value of the calibration feedback is A, it means that the first base station confirms that the measurement information requested by the terminal is accurate. If the value of the calibration feedback is N, it means that the first base station negates that the measurement information requested by the terminal is accurate. Further, when the value of the calibration feedback is N, the first base station determines calibration increment information according to the measurement assistance information, and the calibration increment information is used to calibrate the measurement information requested by the terminal.

[0128] In some embodiments, the above core network element can be a Location Management Function (LMF), an Access and Mobility Management Function (AMF), etc., or a function newly introduced after the access network is service-oriented.

[0129] The technical solution of the embodiment of the present application proposes a new measurement event to trigger a handover. The event associated with the candidate cell reflects the quality change trend of the candidate cell. When the event associated with the candidate cell is triggered, it means that the quality of the candidate cell has an enhanced trend, and the terminal is triggered to hand over to the candidate cell. In addition, the technical solution of the embodiment of the present application proposes a method for quickly calibrating measurement information to enhance the accuracy of handover decision-making. Through the technical solution of the embodiment of the present application, the terminal can autonomously trigger the handover process based on the pre-configured handover conditions, and at the same time increase the accuracy and flexibility of the base station for mobility management.

[0130] Figure 9 It is the second flowchart of the handover method provided by the embodiment of the present application. It should be noted that Figure 9 The source base station in corresponds to the first base station in the previous text, and other base stations correspond to the base stations corresponding to the candidate cells in the previous text (which can be called candidate base stations). The number of other base stations can be one or more; as Figure 9 shown, the handover method includes the following steps:

[0131] Step 901: Perform measurement control and measurement reporting between the source base station and the terminal.

[0132] Here, the source base station sends a measurement configuration to the terminal to implement measurement control of the terminal. The terminal reports the measurement result to the source base station based on the measurement configuration to implement measurement reporting.

[0133] Step 902: The source base station makes a handover decision triggered by the L1 measurement result based on the measurement report of the terminal.

[0134] Here, the condition switching triggered by the L1 measurement result can also be described as the condition switching triggered by L1, or can also be described as the condition switching triggered by LTM.

[0135] Step 903: The source base station sends an RRC reconfiguration message to the terminal, including event configurations associated with at least one candidate cell, and the events associated with the candidate cells are related to the quality change trend of the candidate cells.

[0136] Here, the events associated with the candidate cells can also be understood as mobility events associated with the candidate cells, and these events are used by the terminal to perform handover evaluation of the candidate cells.

[0137] In some embodiments, the event configurations associated with the candidate cells include one or more of the following information:

[0138] 1) Measurement object configuration.

[0139] The measurement object configuration includes beam measurement configurations of at least one candidate cell. Exemplarily, the beam measurement configuration can be a measurement configuration for reference signals such as Channel-state information (CSI-RS), Synchronization Signal / PBCH Block (SSB), etc.

[0140] In specific implementation, the source base station can predict the mobility of the terminal and itself, and send the beam measurement configurations of potential candidate cells to the terminal.

[0141] 2) Trigger conditions and leaving conditions of the event.

[0142] In the embodiments of the present application, the trigger conditions and leaving conditions of the event consider the channel quality situation of a candidate cell over a period of time, that is, the trigger conditions and leaving conditions of the event are related to the quality change trend of the candidate cell. Compared with the traditional trigger conditions and leaving conditions of the event that only consider the cell quality at a single time point, the technical solution of the embodiments of the present application can avoid measurement errors caused by drastic channel changes.

[0143] In the embodiments of the present application, the events described (i.e., the events related to the quality change trend of the candidate cells) are newly defined events, which can be but not limited to being named Event A. The trigger condition of Event A can be denoted as Ax-1, and the leaving condition of Event A can be denoted as Ax-2. When the condition Ax-1 is satisfied, it is considered that the entry condition of this event is satisfied (i.e., this event is triggered); when the condition Ax-2 is satisfied, it is considered that the leaving condition of this event is satisfied.

[0144] In one example, condition Ax-1 can refer to formula (1) above. Condition Ax-2 can refer to formula (2) above.

[0145] It should be noted that when condition Ax-1 of a candidate cell is satisfied, it represents that the beam quality of the candidate cell measured by the terminal has an enhanced trend, and the handover evaluation result of the terminal for the candidate cell is that the terminal performs a handover to the candidate cell.

[0146] Step 904: The terminal sends an RRC reconfiguration complete message to the source base station.

[0147] Step 905: The terminal performs a handover evaluation based on the event associated with the candidate cell.

[0148] It should be noted that the handover evaluation here refers to a conditional handover evaluation. Further, the conditional handover evaluation refers to a conditional handover evaluation triggered by L1 measurement results.

[0149] If the terminal determines that an event associated with a certain candidate cell is triggered, the terminal determines to perform a handover to the candidate cell.

[0150] Step 906: The terminal performs a random access procedure to another base station.

[0151] The other base station here refers to the base station where the candidate cell with the triggered event is located.

[0152] The technical solution of the embodiment of the present application allows the terminal to make its own decision on the conditional handover triggered by LTM. On the one hand, it avoids the problems of inaccurate handover pre-configuration conditions or lost handover commands caused by drastic changes in the channel. On the other hand, it avoids problems such as ping-pong handovers caused by inaccurate L1 measurement results; at the same time, it reduces signaling overhead.

[0153] Figure 10 It is a schematic flow of the handover method provided by the embodiment of the present application Figure 3 , it should be noted that Figure 10 The source base station in [[ ]] corresponds to the first base station in the foregoing text, and the other base stations correspond to the base stations corresponding to the candidate cells in the foregoing text (which can be called candidate base stations). The number of other base stations can be one or more; as Figure 10 shown, the handover method includes the following steps:

[0154] Step 1001: The source base station sends a measurement calibration service request to the core network element.

[0155] Here, the measurement calibration service request is used to request measurement assistance information from the core network element.

[0156] In some embodiments, the measurement calibration service request carries at least one of the following information: terminal type, measurement methods supported by the terminal.

[0157] In some embodiments, the core network element may be functions such as LMF, AMF, or functions newly introduced after the access network is service-enabled.

[0158] Step 1002: The core network element sends a measurement calibration service response to the source base station.

[0159] In some embodiments, the above measurement calibration service response carries measurement assistance information, and the following step 1003 does not need to be executed.

[0160] In some other embodiments, the above measurement calibration service response does not carry measurement assistance information, and the following step 1003 needs to be executed.

[0161] Step 1003 (optional step): The core network element sends measurement assistance information to the source base station.

[0162] In some embodiments, the measurement assistance information includes the mobility information of the terminal and / or the mobility information of other base stations. Here, other base stations refer to candidate base stations related to handover other than the first base station, and the number of other base stations can be one or more. Among them, the mobility information includes at least one of the following information: positioning assistance information, moving speed assistance information, moving direction assistance information. Here, the positioning assistance information is obtained by the core network element in real time / predicting the position of the terminal or other base stations. The moving speed assistance information is obtained by the core network element in real time / predicting the moving speed of the terminal or other base stations. The moving direction assistance information is obtained by the core network element in real time / predicting the moving direction of the terminal or other base stations.

[0163] The positioning assistance information here refers to all assistance information required for the terminal to measure the positioning reference signal (PRS) and calculate the position during the positioning process. Exemplarily, the positioning assistance information includes: the configuration of the PRS, the position information of the transmission and receiving point (TRP), the emission angle of the PRS (i.e., the line-of-sight direction), the measurement interval required for measuring the PRS, etc.

[0164] The moving speed assistance information here can be, for example, the moving speed of the base station, and the moving speed of the base station can be used as a reference value for calculating the moving speed of the terminal. The moving speed assistance information here can also be, for example, the moving speed of the terminal.

[0165] The moving direction assistance information here can be, for example, the moving direction information of the terminal. The moving direction assistance information here can also be, for example, the moving direction information of other base stations.

[0166] It should be noted that for a base station with mobility, the base station can be carried on a mobile device such as a drone or a satellite, and the base station can move along with the movement of the device it carries.

[0167] It should be noted that in the traditional process, the base station forwards measurement information such as positioning to the relevant core network elements. In the future, base stations will have more powerful capabilities or realize RAN side service, and some measurement information processing functions can be transferred to RAN. The advantage is that the types of terminals or base stations will be more diverse in the future, and the communication link between the base station and the core network may also be a wireless channel, so the quality of the backhaul link may be unstable and have a large delay. Therefore, the base station is responsible for collecting and calibrating mobility-related measurement information to enhance reliability and real-time performance.

[0168] Step 1004: The source base station and / or the terminal executes a measurement process.

[0169] The purpose of requiring the number is that other measurement reporting events may be triggered during the measurement process of this step.

[0170] Step 1005: The source base station makes a conditional handover decision triggered by the L1 measurement result based on the measurement report of the terminal.

[0171] Here, the conditional switching triggered by the L1 measurement result may also be described as the conditional switching triggered by L1, or may also be described as the conditional switching triggered by LTM.

[0172] Step 1006: the source base station sends an RRC reconfiguration message to the terminal, including at least one event configuration associated with a candidate cell, where the event associated with the candidate cell is related to a quality change trend of the candidate cell.

[0173] Here, the event associated with the candidate cell may also be understood as a mobility event associated with the candidate cell, and the event is used by the terminal to perform handover evaluation of the candidate cell.

[0174] In some implementations, the event configuration associated with the candidate cell includes one or more of the following information:

[0175] 1) Measurement object configuration.

[0176] The measurement object configuration includes a beam measurement configuration of at least one candidate cell. Exemplarily, the beam measurement configuration may be a measurement configuration for reference signals such as CSI-RS and SSB.

[0177] In specific implementation, the source base station can predict the mobility of the terminal and itself, and send the beam measurement configuration of the potential candidate cell to the terminal.

[0178] 2) The triggering conditions and exit conditions of the event.

[0179] In an embodiment of the present application, the triggering condition and leaving condition of the event take into account the channel quality of the candidate cell in a period of time, that is, the triggering condition and leaving condition of the event are related to the quality change trend of the candidate cell. Compared with the traditional event triggering condition and leaving condition that only consider the cell quality at a single time point, the technical solution of the embodiment of the present application can avoid measurement errors caused by drastic changes in the channel.

[0180] The event described in the embodiment of the present application (i.e., an event related to the quality change trend of the candidate cell) is a newly defined event, which can be but is not limited to being named Event A. The triggering condition of Event A can be recorded as Ax-1, and the exit condition of Event A can be recorded as Ax-2. When condition Ax-1 is met, the entry condition of this event is deemed to be met (i.e., this event is triggered); when condition Ax-2 is met, the exit condition of this event is deemed to be met.

[0181] In one example, the condition Ax-1 can refer to the above formula (1). The condition Ax-2 can refer to the above formula (2).

[0182] It should be noted that when the condition Ax-1 of a candidate cell is met, it means that the beam quality of the candidate cell measured by the terminal has an increasing trend, and the terminal's switching evaluation result for the candidate cell is that the terminal executes switching to the candidate cell.

[0183] Step 1007: The terminal sends a measurement calibration request to the source base station.

[0184] Here, the measurement calibration request may be sent via the first MAC CE, that is, the measurement calibration request is carried in the first MAC CE. The format of the first MAC CE may be the same as the description of the “first MAC CE” in the foregoing text.

[0185] Step 1008: The source base station sends a measurement calibration response to the terminal.

[0186] Here, the measurement calibration response may be sent via the second MAC CE, that is, the measurement calibration response is carried in the second MAC CE. The format of the second MAC CE may be the same as the description of the “second MAC CE” in the foregoing text.

[0187] Step 1009: The terminal performs handover evaluation based on events associated with the candidate cells.

[0188] It should be noted that the handover evaluation here refers to a conditional handover evaluation. Further, the conditional handover evaluation refers to a conditional handover evaluation triggered by an L1 measurement result, which may also be referred to as an LTM conditional handover evaluation.

[0189] If the terminal determines that an event associated with a candidate cell is triggered, the terminal determines to perform a handover to the candidate cell.

[0190] Step 1010: The terminal performs a random access procedure to other base stations.

[0191] Here, the other base stations refer to the base station where the candidate cell with the triggered event is located.

[0192] The following uses specific application examples to illustrate the technical solutions of the embodiments of the present application.

[0193] Figure 11 It is a schematic diagram of a mobility scenario provided by an embodiment of the present application. As Figure 11 shown, in this mobility scenario, the terminal, base station 1, and base station 2 all have mobility. The terminal has two potential target base stations to which it can perform a handover. The moving path of the terminal is from point A to point B. The moving direction of base station 2 is opposite to the moving direction of the terminal, and the moving direction of base station 1 is the same as the moving direction of the terminal.

[0194] According to the traditional handover process, the source base station mainly issues measurement configuration and handover decisions to the terminal based on the channel quality conditions of the terminal. The terminal will have a high probability of performing a handover to target base station 2 at point A and then performing a handover to target base station 1 at point B, resulting in frequent handovers. Figure 12 It is a flowchart of the handover method provided by an embodiment of the present application. Figure 4 It should be noted that Figure 12 the source base station in Figure 12 corresponds to the first base station in the foregoing text, and target base station 2 and target base station 1 are two potential target base stations; as

[0195] Step 1201: The source base station sends a measurement calibration service request to the AMF.

[0196] Here, this measurement calibration service request is used to request measurement assistance information from the AMF.

[0197] Here, the measurement calibration service request includes a terminal mobility calibration request and / or a target base station mobility calibration request. Among them, the terminal mobility calibration request is used to request the mobility information of the terminal from the AMF. The target base station mobility calibration request is used to request the mobility information of the target base station from the AMF. The target base stations here include target base station 1 and target base station 2.

[0198] Step 1202: The AMF sends a measurement calibration service response to the source base station.

[0199] In some embodiments, the above measurement calibration service response carries measurement assistance information, and step 1203 below does not have to be executed.

[0200] In some other embodiments, the above measurement calibration service response does not carry measurement assistance information, and the following step 1203 needs to be executed.

[0201] Step 1203: (Optional step): The AMF sends measurement assistance information to the source base station.

[0202] In some embodiments, the measurement assistance information includes the mobility information of the terminal and / or the mobility information of other base stations. Here, other base stations refer to candidate base stations related to handover other than the first base station, and the number of other base stations can be one or more. Among them, the mobility information includes at least one of the following information: positioning assistance information, moving speed assistance information, moving direction assistance information.

[0203] Step 1204: The source base station and / or the terminal execute a measurement process.

[0204] The measurement process here includes: The source base station determines available PRS configurations and notifies the PRS configurations to the terminal, the target base station 1, and the target base station 2. The target base station 1 and the target base station 2 send PRSs according to their respective PRS configurations; correspondingly, the terminal measures the PRSs according to the PRS configurations and reports the L1 measurement results of the PRSs to the source base station.

[0205] Step 1205: The source base station makes a conditional handover decision triggered by the L1 measurement result based on the measurement report of the terminal.

[0206] Here, the conditional handover triggered by the L1 measurement result can also be described as the conditional handover triggered by L1, or can also be described as the conditional handover triggered by LTM.

[0207] Step 1206: The source base station sends an RRC reconfiguration message to the terminal, including event configurations associated with at least one candidate cell, and the events associated with the candidate cells are related to the quality change trend of the candidate cells.

[0208] This step can refer to the relevant description in step 1006 above. Figure 10 in the above.

[0209] Step 1207: The terminal sends a measurement calibration request to the source base station through the first MAC CE.

[0210] Here, the format of the first MAC CE can refer to Figure 13As shown, it includes two groups of information, corresponding to Cell 1 under Base Station 1 and Cell 2 under Base Station 2 respectively. In the first group of information, the calibration request identifier ID1 is used to identify the measurement calibration request corresponding to Cell 1 under Target Base Station 1; Cell ID1 is used to identify that the cell corresponding to the measurement information for which the terminal requests calibration is Cell 1 under Target Base Station 1; the calibration type identifier ID A is used to identify that the type of the measurement information for which the terminal requests calibration is the quality of the cell; the requested calibration information is used to identify that the measurement information for which the terminal requests calibration is the quality of Cell 1 predicted by the terminal at time t1. In the second group of information, the calibration request identifier ID2 is used to identify the measurement calibration request corresponding to Cell 2 under Target Base Station 2; Cell ID2 is used to identify that the cell corresponding to the measurement information for which the terminal requests calibration is Cell 2 under Target Base Station 2; the calibration type identifier ID A is used to identify that the type of the measurement information for which the terminal requests calibration is the quality of the cell; the requested calibration information is used to identify that the measurement information for which the terminal requests calibration is the quality of Cell 2 predicted by the terminal at time t1.

[0211] Step 1208: The source base station sends a measurement calibration response to the terminal through the second MAC CE.

[0212] Here, the format of the second MAC CE can refer to Figure 14 As shown, it includes two groups of information, corresponding to Cell 1 under Base Station 1 and Cell 2 under Base Station 2 respectively. In the first group of information, the calibration request identifier ID1 is used to identify the measurement calibration request corresponding to Cell 1 under Target Base Station 1; the value of the calibration feedback is N, indicating that the source base station negates that the quality of Cell 1 predicted by the terminal at time t1 is accurate; the calibration increment information is the measurement quality offset ΔHysM of Cell 1 predicted by the source base station. In the second group of information, the calibration request identifier ID2 is used to identify the measurement calibration request corresponding to Cell 2 under Target Base Station 2; the value of the calibration feedback is A, indicating that the source base station affirms that the quality of Cell 2 predicted by the terminal at time t1 is accurate (it can be understood that the deviation between the result predicted by the terminal and the result predicted by the base station is within a reasonable range), so there is no need to give the quality offset of Cell 2.

[0213] Step 1209: The terminal performs handover evaluation based on the events associated with the candidate cells and the calibration increment information sent by the source base station.

[0214] It should be noted that the handover evaluation here refers to conditional handover evaluation. Further, this conditional handover evaluation refers to the conditional handover evaluation triggered by the L1 measurement result, and can also be called LTM conditional handover evaluation.

[0215] The terminal measures Cell 1 under Target Base Station 1, measures the quality of Cell 1 as M(t2 - T) at time t2 - T, and measures the quality of Cell 1 as M(t2) at time t2. Then, according to the previous formula (3), the quality increment of Cell 1 corresponding to time t2 can be obtained as: MΔ (t2) = |M(t2) - M(t2 - T)|. The quality of cell 1 measured at time t3 - T is M(t3 - T), and the quality of cell 1 measured at time t3 is M(t3). Then, according to formula (3) above, the quality increment of cell 1 corresponding to time t3 can be obtained as: M Δ (t3) = |M(t3) - M(t3 - T)|.

[0216] If the measurement result of the terminal meets the triggering condition of the event (i.e., formula (4) below), then the terminal is triggered to handover to cell 1:

[0217] M Δ (t3) - M Δ (t2) - HysM + ΔHysM > ThreshM (4)

[0218] Where ΔHysM is the measurement quality bias of cell 1 under target base station 1 configured by the source base station for the terminal. HysM represents the bias of the quality increment of cell 1 under target base station 1; ThreshM represents the first threshold.

[0219] Step 1210: The terminal performs a random access procedure to cell 1 under base station 1.

[0220] The technical solution of the embodiment of the present application proposes a conditional handover method triggered based on L1 measurement results, where the pre - configured handover condition reflects an enhanced trend in the quality of neighboring cells; in addition, a measurement information calibration process and a new type of MAC CE are introduced to achieve fast measurement calibration and incremental configuration distribution, assisting the base station and the terminal to more flexibly and accurately make mobility management decisions.

[0221] Figure 15 It is a schematic structural composition of the handover device provided by the embodiment of the present application Figure 1 , applied to the terminal, as Figure 15 shown, the handover device includes:

[0222] The first communication unit 1501 is configured to receive a first configuration message sent by the first base station. The first configuration message includes the configuration of at least one candidate cell. The configuration of the candidate cell includes the event associated with the candidate cell, and the event associated with the candidate cell is related to the quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0223] In some embodiments, the triggering condition for the event associated with the candidate cell is that a first quality change value is greater than or equal to a first threshold, where the first quality change value is determined based on the quality increment of the candidate cell corresponding to a first time point, the quality increment of the candidate cell corresponding to a second time point, and the bias of the quality increment of the candidate cell; the leaving condition for the event associated with the candidate cell is that a second quality change value is less than or equal to a second threshold, where the second quality change value is determined based on the quality increment of the candidate cell corresponding to a first time point, the quality increment of the candidate cell corresponding to a second time point, and the bias of the quality increment of the candidate cell.

[0224] In some embodiments, the first threshold, the second threshold, and the bias of the quality increment are configured by the first base station according to a specific frequency or a specific cell or a specific terminal type or a specific base station type.

[0225] In some embodiments, the first communication unit 1501 is further configured to send a measurement calibration request to the first base station, where the measurement calibration request is used to request the first base station to calibrate measurement information; and receive a measurement calibration response sent by the first base station, where the measurement calibration response corresponds to the measurement calibration request.

[0226] In some embodiments, the measurement calibration request is carried in a first MAC CE, and the first MAC CE includes one or more of the following information:

[0227] First information, where the first information is used to identify the measurement calibration request;

[0228] Second information, where the second information is used to identify the cell corresponding to the measurement information for which the terminal requests calibration;

[0229] Third information, where the third information is used to identify the type of the measurement information for which the terminal requests calibration;

[0230] Fourth information, where the fourth information is used to identify the measurement information for which the terminal requests calibration.

[0231] In some embodiments, the measurement calibration response is carried in a second MAC CE, and the second MAC CE includes one or more of the following information:

[0232] First information, where the first information is used to identify the measurement calibration request;

[0233] Fifth information, where the fifth information is used to identify the calibration feedback result of the first base station for the measurement information;

[0234] Sixth information, which is used to identify the calibration increment information of the measurement information by the first base station.

[0235] In some embodiments, the measurement calibration response is carried in a third MAC CE, and the third MAC CE includes one or more of the following information:

[0236] First information, which is used to identify the measurement calibration request;

[0237] Second information, which is used to identify the cell corresponding to the measurement information for which the terminal requests calibration;

[0238] Seventh information, which is used to identify the measurement configuration corresponding to the measurement information for which the terminal requests calibration;

[0239] Eighth information, which is used to identify the calibration configuration information of the measurement configuration by the first base station.

[0240] In some embodiments, the apparatus further includes: a first processing unit 1502, configured to calibrate the measurement information based on the measurement calibration response.

[0241] In some embodiments, the first processing unit 1502 is further configured to perform a handover to the first candidate cell when it is determined that an event associated with the first candidate cell is triggered based on the first configuration message, and the first candidate cell belongs to the at least one candidate cell.

[0242] Those skilled in the art should understand that Figure 15 The implementation functions of the units in the shown handover apparatus can be understood with reference to the relevant descriptions of the foregoing method. Figure 15 The functions of the units in the shown handover apparatus can be implemented by a program running on a processor or by specific logic circuits.

[0243] Figure 16 is the second schematic diagram of the structural composition of the handover apparatus provided by an embodiment of the present application, applied to a first base station, as Figure 16 shown, the handover apparatus includes:

[0244] A second communication unit 1601, configured to send a first configuration message to a terminal, where the first configuration message includes the configuration of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to the quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

[0245] In some embodiments, the triggering condition for the event associated with the candidate cell is that the first quality change value is greater than or equal to the first threshold, where the first quality change value is determined based on the quality increment of the candidate cell corresponding to the first time point, the quality increment of the candidate cell corresponding to the second time point, and the bias of the quality increment of the candidate cell; the leaving condition for the event associated with the candidate cell is that the second quality change value is less than or equal to the second threshold, where the second quality change value is determined based on the quality increment of the candidate cell corresponding to the first time point, the quality increment of the candidate cell corresponding to the second time point, and the bias of the quality increment of the candidate cell.

[0246] In some embodiments, the second communication unit 1601 is further configured to receive a measurement calibration request sent by the terminal, where the measurement calibration request is used to request the first base station to calibrate measurement information; and send a measurement calibration response to the terminal, where the measurement calibration response corresponds to the measurement calibration request.

[0247] In some embodiments, the measurement calibration request is carried in a first MAC CE, and the first MAC CE includes one or more of the following information:

[0248] First information, where the first information is used to identify the measurement calibration request;

[0249] Second information, where the second information is used to identify the cell corresponding to the measurement information for which the terminal requests calibration;

[0250] Third information, where the third information is used to identify the type of the measurement information for which the terminal requests calibration;

[0251] Fourth information, where the fourth information is used to identify the measurement information for which the terminal requests calibration.

[0252] In some embodiments, the measurement calibration response is carried in a second MAC CE, and the second MAC CE includes one or more of the following information:

[0253] First information, where the first information is used to identify the measurement calibration request;

[0254] Fifth information, where the fifth information is used to identify the calibration feedback result of the first base station on the measurement information;

[0255] Sixth information, where the sixth information is used to identify the calibration increment information of the first base station on the measurement information.

[0256] In some embodiments, the measurement calibration response is carried in a third MAC CE, and the third MAC CE includes one or more of the following information:

[0257] The first information, which is used to identify the measurement calibration request;

[0258] The second information, which is used to identify the cell corresponding to the measurement information for which the terminal requests calibration;

[0259] The seventh information, which is used to identify the measurement configuration corresponding to the measurement information for which the terminal requests calibration;

[0260] The eighth information, which is used to identify the calibration configuration information of the first base station for the measurement configuration.

[0261] In some embodiments, the second communication unit 1601 is further configured to send a measurement calibration service request to a core network element, where the measurement calibration service request is used to request measurement assistance information from the core network element; and receive a measurement calibration service response sent by the core network element, where the measurement calibration service response corresponds to the measurement calibration service request.

[0262] In some embodiments, the measurement calibration service response carries the measurement assistance information; or,

[0263] The measurement calibration service response does not carry the measurement assistance information, and the second communication unit 1601 is further configured to receive the measurement assistance information sent by the core network element.

[0264] In some embodiments, the apparatus further includes: a second processing unit 1602, configured to calibrate the measurement information requested by the terminal based on the measurement assistance information.

[0265] Those skilled in the art should understand that, Figure 16 The implementation functions of the units in the shown handover apparatus can be understood with reference to the relevant descriptions of the foregoing method. Figure 16 The functions of the units in the shown handover apparatus can be implemented by a program running on a processor or by specific logic circuits.

[0266] Figure 17 is a schematic structural diagram of a communication device 1700 provided by an embodiment of the present application. The communication device can be a terminal or a network device, Figure 17 The shown communication device 1700 includes a processor 1710, and the processor 1710 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0267] Optionally, as Figure 17As shown, the communication device 1700 may further include a memory 1720. Among them, the processor 1710 may call and run a computer program from the memory 1720 to implement the method in the embodiments of the present application.

[0268] Among them, the memory 1720 may be a separate device independent of the processor 1710, or may be integrated in the processor 1710.

[0269] Optionally, as Figure 17 shown, the communication device 1700 may further include a transceiver 1730. The processor 1710 may control the transceiver 1730 to communicate with other devices. Specifically, it may send information or data to other devices, or receive information or data sent by other devices.

[0270] Among them, the transceiver 1730 may include a transmitter and a receiver. The transceiver 1730 may further include an antenna, and the number of antennas may be one or more.

[0271] Optionally, the communication device 1700 may specifically be the network device in the embodiments of the present application, and the communication device 1700 may implement the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0272] Optionally, the communication device 1700 may specifically be the mobile terminal / terminal in the embodiments of the present application, and the communication device 1700 may implement the corresponding processes implemented by the mobile terminal / terminal in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0273] Figure 18 is a schematic structural diagram of the chip in the embodiments of the present application. Figure 18 The chip 1800 shown includes a processor 1810. The processor 1810 may call and run a computer program from the memory to implement the method in the embodiments of the present application.

[0274] Optionally, as Figure 18 shown, the chip 1800 may further include a memory 1820. Among them, the processor 1810 may call and run a computer program from the memory 1820 to implement the method in the embodiments of the present application.

[0275] Among them, the memory 1820 may be a separate device independent of the processor 1810, or may be integrated in the processor 1810.

[0276] Optionally, the chip 1800 may further include an input interface 1830. Among them, the processor 1810 may control the input interface 1830 to communicate with other devices or chips. Specifically, it may obtain information or data sent by other devices or chips.

[0277] Optionally, the chip 1800 may further include an output interface 1840. Among them, the processor 1810 may control the output interface 1840 to communicate with other devices or chips. Specifically, it may output information or data to other devices or chips.

[0278] Optionally, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0279] Optionally, the chip can be applied to the mobile terminal / terminal in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal / terminal in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0280] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip, etc.

[0281] It should be understood that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit in the hardware of the processor or by instructions in software form. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed by the hardware decoding processor, or executed by a combination of the hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0282] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include but not be limited to these and any other suitable types of memory.

[0283] It should be understood that the above memory is by way of example but not limitation. For example, the memory in the embodiments of the present application can also be a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate SDRAM (DDR SDRAM), an enhanced SDRAM (ESDRAM), a synch link DRAM (SLDRAM), and a direct rambus random access memory (DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not be limited to these and any other suitable types of memory.

[0284] The embodiments of the present application also provide a computer-readable storage medium for storing a computer program.

[0285] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0286] Optionally, the computer-readable storage medium can be applied to the mobile terminal / terminal in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal / terminal in each method of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0287] The embodiments of the present application also provide a computer program product, including computer program instructions.

[0288] Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0289] Optionally, the computer program product can be applied to the mobile terminal / terminal in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal / terminal in each method of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0290] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0291] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated here.

[0292] In several embodiments provided in the present application, 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 merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms.

[0293] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or 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.

[0294] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0295] If the above functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present application, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0296] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all of them should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A switching method, characterized in that, The method includes: The terminal receives a first configuration message sent by a first base station. The first configuration message includes configurations of at least one candidate cell. The configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to the quality change trend of the candidate cell. Among them, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

2. The method according to claim 1, wherein The triggering condition of the event associated with the candidate cell is that a first quality change value is greater than or equal to a first threshold. The first quality change value is determined based on the quality increment of the candidate cell corresponding to a first time point, the quality increment of the candidate cell corresponding to a second time point, and the bias of the quality increment of the candidate cell. The leaving condition of the event associated with the candidate cell is that a second quality change value is less than or equal to a second threshold. The second quality change value is determined based on the quality increment of the candidate cell corresponding to a first time point, the quality increment of the candidate cell corresponding to a second time point, and the bias of the quality increment of the candidate cell.

3. The method according to claim 2, wherein The first threshold, the second threshold, and the bias of the quality increment are configured by the first base station according to a specific frequency or a specific cell or a specific terminal type or a specific base station type.

4. The method according to claim 1, characterized in that, The method further includes: The terminal sends a measurement calibration request to the first base station. The measurement calibration request is used to request the first base station to calibrate measurement information. The terminal receives a measurement calibration response sent by the first base station. The measurement calibration response corresponds to the measurement calibration request.

5. The method according to claim 4, wherein The measurement calibration request is carried in a first MAC CE. The first MAC CE includes one or more of the following information: First information, which is used to identify the measurement calibration request. Second information, which is used to identify the cell corresponding to the measurement information for which the terminal requests calibration. Third information, which is used to identify the type of the measurement information for which the terminal requests calibration. Fourth information, which is used to identify the measurement information for which the terminal requests calibration.

6. The method according to claim 4, characterized in that, The measurement calibration response is carried in a second MAC CE. The second MAC CE includes one or more of the following information: First information, which is used to identify the measurement calibration request. Fifth information, which is used to identify the calibration feedback result of the first base station on the measurement information. Sixth information, which is used to identify the calibration increment information of the first base station on the measurement information.

7. The method according to claim 4, characterized in that, The measurement calibration response is carried in a third MAC CE. The third MAC CE includes one or more of the following information: First information, which is used to identify the measurement calibration request. Second information, which is used to identify the cell corresponding to the measurement information for which the terminal requests calibration. Seventh information, which is used to identify the measurement configuration corresponding to the measurement information for which the terminal requests calibration. Eighth information, which is used to identify the calibration configuration information of the first base station on the measurement configuration.

8. The method according to any one of claims 4 to 7, characterized in that, The method further includes: The terminal calibrates the measurement information based on the measurement calibration response.

9. The method according to any one of claims 1 to 7, characterized in that The method further includes: When the terminal determines that an event associated with a first candidate cell is triggered based on the first configuration message, the terminal performs a handover to the first candidate cell, where the first candidate cell belongs to the at least one candidate cell.

10. A switching method, characterized in that, The method includes: A first base station sends a first configuration message to a terminal, where the first configuration message includes configurations of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to a quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used by the terminal to perform handover evaluation of the candidate cell.

11. The method according to claim 10, wherein A triggering condition of the event associated with the candidate cell is that a first quality change value is greater than or equal to a first threshold, and the first quality change value is determined based on a quality increment of the candidate cell corresponding to a first time point, a quality increment of the candidate cell corresponding to a second time point, and a bias of the quality increment of the candidate cell; A leaving condition of the event associated with the candidate cell is that a second quality change value is less than or equal to a second threshold, and the second quality change value is determined based on a quality increment of the candidate cell corresponding to a first time point, a quality increment of the candidate cell corresponding to a second time point, and a bias of the quality increment of the candidate cell.

12. The method according to claim 11, wherein The method further includes: The first base station receives a measurement calibration request sent by the terminal, where the measurement calibration request is used to request the first base station to calibrate measurement information; The first base station sends a measurement calibration response to the terminal, and the measurement calibration response corresponds to the measurement calibration request.

13. The method according to claim 12, wherein The measurement calibration request is carried in a first MAC CE, and the first MAC CE includes one or more of the following information: First information, where the first information is used to identify the measurement calibration request; Second information, where the second information is used to identify a cell corresponding to the measurement information for which the terminal requests calibration; Third information, where the third information is used to identify a type of the measurement information for which the terminal requests calibration; Fourth information, where the fourth information is used to identify the measurement information for which the terminal requests calibration.

14. The method according to claim 12, wherein The measurement calibration response is carried in a second MAC CE, and the second MAC CE includes one or more of the following information: First information, where the first information is used to identify the measurement calibration request; Fifth information, where the fifth information is used to identify a calibration feedback result of the first base station on the measurement information; Sixth information, where the sixth information is used to identify calibration increment information of the first base station on the measurement information.

15. The method according to claim 12, wherein The measurement calibration response is carried in a third MAC CE, and the third MAC CE includes one or more of the following information: First information, where the first information is used to identify the measurement calibration request; Second information, where the second information is used to identify a cell corresponding to the measurement information for which the terminal requests calibration; The seventh piece of information, which is used to identify the measurement configuration corresponding to the measurement information for which the terminal requests calibration; The eighth piece of information, which is used to identify the calibration configuration information of the first base station for the measurement configuration.

16. The method according to any one of claims 12 to 15, characterized in that The method further includes: The first base station sends a measurement calibration service request to a core network element, where the measurement calibration service request is used to request measurement assistance information from the core network element; The first base station receives a measurement calibration service response sent by the core network element, and the measurement calibration service response corresponds to the measurement calibration service request.

17. The method according to claim 16, wherein The measurement calibration service response carries the measurement assistance information; Or, The measurement calibration service response does not carry the measurement assistance information, and the method further includes: The first base station receives the measurement assistance information sent by the core network element.

18. The method according to claim 17, characterized in that The method further includes: The first base station calibrates the measurement information requested by the terminal based on the measurement assistance information.

19. A switching device, characterized in that, Applied to a terminal, the apparatus includes: A first communication unit, configured to receive a first configuration message sent by a first base station, where the first configuration message includes configurations of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to a quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

20. A switching device, characterized in that, Applied to a first base station, the apparatus includes: A second communication unit, configured to send a first configuration message to a terminal, where the first configuration message includes configurations of at least one candidate cell, and the configuration of the candidate cell includes an event associated with the candidate cell, and the event associated with the candidate cell is related to a quality change trend of the candidate cell; wherein, the event associated with the candidate cell is used for the terminal to perform handover evaluation of the candidate cell.

21. A communication device, characterized in that, Comprising: A processor and a memory, where the memory is used to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 18.

22. A computer-readable storage medium, characterized in that, For storing a computer program, where the computer program causes a computer to execute the method according to any one of claims 1 to 18.

23. A computer program product, characterized in that, Including computer program instructions, where the computer program instructions cause a computer to execute the method according to any one of claims 1 to 18.

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