WO2023197838A1

WO2023197838A1 - Method for implementing condition handover, and electronic device and computer-readable medium

Info

Publication number: WO2023197838A1
Application number: PCT/CN2023/083090
Authority: WO
Inventors: 杜彬; 乾春燕; 杨鹏举
Original assignee: 中兴通讯股份有限公司
Priority date: 2022-04-15
Filing date: 2023-03-22
Publication date: 2023-10-19
Also published as: CN116963195A

Abstract

Provided in the present disclosure are a method for implementing condition handover, and an electronic device and a computer-readable medium. The method for implementing condition handover comprises: receiving an enhanced condition handover configuration parameter, which is issued by a first base station, wherein the enhanced condition handover configuration parameter comprises: a first measurement configuration parameter, a first condition handover configuration parameter and a secondary carrier adding configuration parameter; measuring a neighbor cell according to the first measurement configuration parameter; when it is determined, according to a measurement result and the first measurement configuration parameter, that a first neighbor cell meets a first handover condition, performing, according to the first condition handover configuration parameter, handover to a second base station corresponding to the first neighbor cell, and adding a secondary carrier according to the secondary carrier adding configuration parameter; and sending an enhanced condition handover reconfiguration completion message to the second base station.

Description

Method, electronic device, computer-readable medium for realizing conditional switching

Relevant public cross-references

This disclosure requires the priority of a Chinese patent application submitted to the State Intellectual Property Office on April 15, 2022, with the publication number CN202210402140.6 and the invention name "Method, electronic device, and computer-readable medium for realizing conditional switching", which The entire contents of the application are incorporated by reference into this disclosure.

Technical field

Embodiments of the present disclosure relate to, but are not limited to, the field of communication technology, and specifically relate to methods, electronic devices, and computer-readable media for implementing conditional switching.

Background technique

With the continuous development and application of the fifth generation mobile communication technology (5G, 5th Generation), many new features and scenarios have been born, among which condition handover (CHO, Condition Handover) is a very important function among the new features of 5G. The core idea of conditional handover is to deliver the configuration parameters required for handover and measurement to the user equipment (UE, User Equipment) in advance, and the UE independently selects the target base station based on the measurement results and performs the handover process. The advantage of this is that it can save signaling interaction time during the handover process, and at the same time avoid the problem of handover failure caused by changes in wireless link conditions. It can be said that conditional switching effectively improves the robustness of the user switching process.

Although conditional handover has greatly improved the handover delay of the main carrier and improved the handover success rate, it will reveal certain disadvantages in complex networking scenarios. Among them, using conditional switching in the carrier aggregation (CA) networking mode can only reduce the switching time of the primary carrier, but cannot effectively reduce the speed of changing or adding secondary carriers. Since the user's traffic fluctuation during the handover process is directly related to the change speed of the primary carrier and the secondary carrier, even using conditional handover in the CA scenario cannot effectively improve the traffic fluctuation problem during the handover process.

Contents of the invention

Embodiments of the present disclosure provide a method, electronic device, and computer-readable medium for implementing conditional switching.

In a first aspect, embodiments of the present disclosure provide a method for implementing conditional handover, including: receiving enhanced conditional handover configuration parameters issued by a first base station; wherein the enhanced conditional handover configuration parameters include: first measurement configuration parameters , first condition switching configuration parameters, secondary carrier addition configuration parameters; measuring the neighboring cell according to the first measurement configuration parameter; determining that the first neighboring cell satisfies the first switching condition according to the measurement result and the first measurement configuration parameter. In the case of switching configuration parameters according to the first condition, switch to the second base station corresponding to the first neighboring cell, add a secondary carrier according to the secondary carrier addition configuration parameter; send the enhanced condition to the second base station Toggle reconfiguration complete message.

In a second aspect, embodiments of the present disclosure provide an electronic device, including: at least one processor; and a memory. At least one program is stored on the memory. When the at least one program is executed by the at least one processor, any of the above is implemented. A way to implement conditional switching.

In a third aspect, embodiments of the present disclosure provide a computer-readable medium. A computer program is stored on the computer-readable medium. When the computer program is executed by a processor, any one of the above methods for realizing conditional switching is implemented.

The method for realizing conditional handover provided by the embodiments of the present disclosure performs the addition operation of the auxiliary carrier while realizing the conditional handover, and simultaneously reduces the handover delay and the auxiliary carrier addition delay, so that the use of conditional handover in the CA scenario is effectively improved. This solves the traffic fluctuation problem during the switching process.

Description of the drawings

Figure 1 is a flow chart of a method for implementing conditional switching provided by an embodiment of the present disclosure;

Figure 2 is a schematic diagram of an application scenario of Example 1 of the embodiment of the present disclosure;

Figure 3 is an interactive schematic diagram of implementing conditional switching in Example 1 of the embodiment of the present disclosure;

Figure 4 is a schematic diagram of an application scenario of Example 2 of the embodiment of the present disclosure;

Figure 5 is an interactive schematic diagram 1 of implementing conditional switching in Example 2 of the embodiment of the present disclosure;

Figure 6 is a second interactive schematic diagram for realizing conditional switching in Example 2 of the embodiment of the present disclosure;

Figure 7 is a schematic diagram of an application scenario of Example 3 of the embodiment of the present disclosure;

Figure 8 is an interactive schematic diagram of implementing conditional switching in Example 3 of the embodiment of the present disclosure;

Figure 9 is a schematic diagram of an application scenario of Example 4 of the embodiment of the present disclosure;

Figure 10 is an interactive schematic diagram 1 of implementing conditional switching in Example 4 of the embodiment of the present disclosure;

Figure 11 is an interactive schematic diagram 2 of implementing conditional switching in Example 4 of the embodiment of the present disclosure;

Figure 12 is a schematic diagram of an application scenario of Example 5 of the embodiment of the present disclosure;

Figure 13 is an interactive schematic diagram of implementing conditional switching in Example 5 of the embodiment of the present disclosure;

Figure 14 is a block diagram of a device for implementing conditional switching provided by another embodiment of the present disclosure.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the methods, electronic devices, and computer-readable media provided by the present disclosure for implementing conditional switching are described in detail below in conjunction with the accompanying drawings.

Example embodiments will be described more fully below with reference to the accompanying drawings, which may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully understand the scope of the disclosure to those skilled in the art.

The embodiments of the present disclosure and the features in the embodiments may be combined with each other without conflict.

As used herein, the term "and/or" includes any and all combinations of at least one associated listed item.

The terminology used herein is used to describe particular embodiments only and is not intended to limit the disclosure. As used herein, the singular forms "a,""an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and/or "made of" are used in this specification, the presence of stated features, integers, steps, operations, elements and/or is specified. or component, but does not exclude the presence or addition of at least one other feature, integer, step, operation, element, component and/or group thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be construed to have meanings consistent with their meanings in the context of the relevant art and the present disclosure, and will not be construed as having idealized or excessive formal meanings, Unless expressly so limited herein.

Figure 1 is a flow chart of a method for implementing conditional switching provided by an embodiment of the present disclosure.

In the first aspect, referring to FIG. 1 , an embodiment of the present disclosure provides a method for implementing conditional switching, which is applied to a terminal. In the embodiment of the present disclosure, the terminal can support the CA addition function, and the terminal can perform the CA addition function on the accessed base station, that is, add the secondary carrier.

The method includes:

Step 100: Receive enhanced conditional handover configuration parameters issued by the first base station; wherein the enhanced conditional handover configuration parameters include: first measurement configuration parameters, first conditional handover configuration parameters, and secondary carrier addition configuration parameters.

In some exemplary embodiments, the first base station is a base station that supports the CA function, and the terminal accessed by the first base station can increase the peak traffic of the user by adding a secondary carrier.

In some exemplary embodiments, the cell corresponding to the first base station may be a single-carrier cell, and the terminal will not add any secondary carrier when accessing the cell corresponding to the first base station; the cell corresponding to the first base station may also be a CA cell, and the terminal will not add any secondary carrier. A secondary carrier can be added after the cell corresponding to the first base station is accessed. The cell corresponding to the first base station may be a co-coverage CA cell or a non-co-coverage CA cell.

In some exemplary embodiments, the first measurement configuration parameters include: information characterizing the neighboring cells of the main carrier that need to be measured, and a first threshold.

In some exemplary embodiments, the first measurement configuration parameters include: information characterizing the neighboring cells of the primary carrier that need to be measured, a first threshold, information characterizing the neighboring cells of the secondary carrier that need to be measured, and a second threshold.

In some exemplary embodiments, the first conditional handover configuration parameters include: air interface resource configuration parameters of the target cell and bearer information configuration parameters of the target cell.

In some exemplary embodiments, the additional configuration parameters of the secondary carrier include: the additional configuration parameters of all secondary carriers corresponding to the neighboring cells that need to be measured. For example, the added configuration parameters of the secondary carrier include: air interface resource configuration parameters of the cell corresponding to the secondary carrier, and bearer information configuration parameters of the cell corresponding to the secondary carrier.

In some exemplary embodiments, the enhanced conditional handover configuration parameters further include: first secondary carrier deletion configuration parameters.

In some exemplary embodiments, the first secondary carrier deletion configuration parameters include: deletion configuration parameters of all secondary carriers that have been added. For example, the first secondary carrier deletion configuration parameters include: cell indexes of all secondary carriers that have been added.

In some exemplary embodiments, according to the provisions in the protocol, when the first measurement configuration parameter is used to measure the main carrier of a neighboring cell, the first measurement configuration parameter refers to the condition A3 (condition A3) measurement configuration parameter, which is the same as condition A3. The first conditional switching configuration parameters corresponding to the A3 measurement configuration parameters refer to the conditional switching configuration parameters corresponding to the condition A3, and the secondary carrier addition configuration parameters corresponding to the condition A3 measurement configuration parameters refer to the configuration parameters of the secondary carrier addition corresponding to the condition A3. , the first threshold in the condition A3 measurement configuration parameters refers to the threshold of condition A3, and the first secondary carrier deletion configuration parameter corresponding to the condition A3 measurement configuration parameter refers to the configuration parameter for secondary carrier deletion corresponding to condition A3.

In some exemplary embodiments, according to the provisions in the protocol, when the first measurement configuration parameter is used to measure the primary carrier and secondary carrier of the neighboring cell, the first measurement configuration parameter refers to the condition A3 (condition A3) measurement configuration parameter. and condition A4 (conditionA4) measurement configuration parameters, the first condition switching configuration parameter corresponding to the condition A3 measurement configuration parameter and the condition A4 measurement configuration parameter refers to the condition switching configuration parameter corresponding to condition A3 and condition A4, and the condition A3 measurement configuration Parameters and condition A4 measurement configuration parameters corresponding to the auxiliary carrier addition configuration parameters refer to the auxiliary carrier addition configuration parameters corresponding to conditions A3 and condition A4. The first threshold in the condition A3 measurement configuration parameters refers to the threshold of condition A3. Condition A4 The second threshold in the measurement configuration parameters refers to the threshold of condition A4.

In some exemplary embodiments, according to the provisions in the protocol, when the first measurement configuration parameter is used to measure the primary carrier and secondary carrier of the neighboring cell, the first measurement configuration parameter refers to the condition A3 (condition A3) measurement configuration parameter. and condition A6 (conditionA6) measurement configuration parameters, the first condition switching configuration parameter corresponding to the condition A3 measurement configuration parameter and the condition A6 measurement configuration parameter refers to the condition switching configuration parameter corresponding to condition A3 and condition A6, and the condition A3 measurement configuration Parameters and Conditions A6 measurement configuration parameters corresponding to the auxiliary carrier addition configuration parameters refer to the auxiliary carrier addition configuration parameters corresponding to conditions A3 and condition A6. The first threshold in the condition A3 measurement configuration parameters refers to the threshold of condition A3. Condition A6 The second threshold in the measurement configuration parameters refers to the threshold of condition A6.

In some exemplary embodiments, the terminal may receive the enhanced conditional handover configuration parameters issued by the first base station after the first base station completes the initial access.

Step 101: Measure the neighboring cell according to the first measurement configuration parameter.

In some exemplary embodiments, measuring the neighboring cell according to the first measurement configuration parameter includes: measuring the main carrier of the neighboring cell corresponding to the information characterizing the neighboring cell that needs to measure the main carrier.

In some exemplary embodiments, measuring the primary carrier refers to measuring the received signal strength of the primary carrier.

In some exemplary embodiments, measuring the neighboring cell according to the first measurement configuration parameter includes: measuring the main carrier of the neighboring cell corresponding to the information characterizing the neighboring cell that needs to measure the main carrier; measuring the neighboring cell that represents the need to measure the secondary carrier. Measure the secondary carrier of the neighboring cell corresponding to the cell information.

In some exemplary embodiments, measuring the secondary carrier refers to measuring the received signal strength of the secondary carrier.

Step 102: When it is determined that the first neighboring cell satisfies the first handover condition based on the measurement results and the first measurement configuration parameters, the switching configuration parameters are switched to the second base station corresponding to the first neighboring cell according to the first condition, and the secondary carrier is added according to Configure parameters to add secondary carriers.

In some exemplary embodiments, the first neighboring cell is a same-coverage carrier aggregation cell or a different-coverage carrier aggregation cell.

When the first neighboring cell is a same-coverage carrier aggregation cell, a terminal accessing the first neighboring cell can directly add a secondary carrier without performing secondary carrier measurement. Aggregation of carriers for different coverage in the first neighbor cell In the case of a cell, a terminal accessing the first neighboring cell cannot directly add a secondary carrier. Instead, the terminal needs to measure that the received signal strength of the secondary carrier meets a certain threshold before adding a secondary carrier.

In some exemplary embodiments, determining that the first neighboring cell satisfies the first handover condition based on the measurement results and the first measurement configuration parameter includes: the received signal strength of the main carrier of the first neighboring cell is equal to the main carrier of the cell corresponding to the first base station. The difference in received signal strength meets the first threshold.

In some exemplary embodiments, the difference between the received signal strength of the main carrier of the first neighboring cell and the received signal strength of the main carrier of the cell corresponding to the first base station that satisfies the first threshold includes: The difference between the received signal strength and the received signal strength of the main carrier of the cell corresponding to the first base station is greater than the first threshold.

In some exemplary embodiments, determining that the first neighboring cell satisfies the first handover condition according to the first measurement result and the first measurement configuration parameter includes: the first time is earlier than the second time; wherein the first time is the first neighboring cell The time when the received signal strength of the secondary carrier satisfies the second threshold. The second time is when the difference between the received signal strength of the primary carrier of the first neighboring cell and the received signal strength of the primary carrier of the cell corresponding to the first base station satisfies the first threshold. time; or, the first time is the time when the difference between the received signal strength of the secondary carrier of the first neighboring cell and the received signal strength of the secondary carrier of the cell corresponding to the first base station meets the second threshold, and the second time is the time of the first The time when the difference between the received signal strength of the main carrier of the adjacent cell and the received signal strength of the main carrier of the cell corresponding to the first base station satisfies the first threshold.

In some exemplary embodiments, the received signal strength of the secondary carrier of the first adjacent cell satisfies the second threshold including: the received signal strength of the secondary carrier of the first adjacent cell is greater than the second threshold.

In some exemplary embodiments, the difference between the received signal strength of the secondary carrier of the first neighboring cell and the received signal strength of the secondary carrier of the cell corresponding to the first base station that satisfies the second threshold includes: The difference between the received signal strength and the received signal strength of the secondary carrier of the cell corresponding to the first base station is greater than the second threshold.

In some exemplary embodiments, adding a secondary carrier according to a secondary carrier adding configuration parameter includes: adding a secondary carrier according to all secondary carrier adding configuration parameters corresponding to the first neighboring cell.

In some exemplary embodiments, switching to the second base station corresponding to the first neighboring cell according to the first conditional handover configuration parameter is to perform switching from the main carrier of the first base station to the main carrier of the first neighboring cell according to the first conditional handover configuration parameter. switch.

In some exemplary embodiments, switching to the second base station corresponding to the first neighboring cell according to the first condition switching configuration parameters includes: changing the bearer information to the bearer information of the first neighboring cell according to the bearer information configuration parameters of the first neighboring cell. , adjust the air interface timing to the first neighboring cell according to the measurement results, and update the air interface resource information to the air interface resource information of the first neighboring cell according to the air interface resource configuration parameters of the first neighboring cell.

In some exemplary embodiments, adding a secondary carrier based on the secondary carrier adding configuration parameters includes: establishing bearer information for the newly added secondary carrier based on the bearer information configuration parameters of the cell corresponding to the secondary carrier, and based on the air interface resources of the cell corresponding to the secondary carrier. Configure parameters to allocate air interface resources to the newly added secondary carrier and synchronize downlink timing.

In some exemplary embodiments, when it is determined that the first neighboring cell satisfies the first handover condition according to the first measurement result and the first measurement configuration parameter, the method further includes: performing secondary carrier deletion according to the first secondary carrier deletion configuration parameter. delete.

In some exemplary embodiments, deleting the secondary carrier according to the first secondary carrier deletion configuration parameter includes: deleting all the added secondary carriers according to the deletion configuration parameters of all the added secondary carriers.

In some exemplary embodiments, deleting all added secondary carriers according to deletion configuration parameters of all added secondary carriers includes: releasing bearers and air interface resources of all added secondary carriers.

In some exemplary embodiments, the second base station is a base station that supports the CA function, and the terminal accessed by the second base station can increase the peak traffic of the user by adding a secondary carrier.

Step 103: Send an enhanced conditional handover reconfiguration completion message to the second base station.

In some exemplary embodiments, the switching configuration parameters are switched to the second base station corresponding to the first neighbor cell according to the first condition. After the secondary carrier is added according to the secondary carrier addition configuration parameters, the second base station is switched to the second base station. Before the station sends the enhanced conditional handover reconfiguration completion message, the method further includes: sending a first message to the second base station, and receiving a second message returned by the second base station. In some exemplary embodiments, the first message and the second message are used for timing synchronization between the terminal and the second base station.

In some exemplary embodiments, before measuring the neighboring cell according to the first measurement configuration parameter, the method further includes: receiving a common conditional handover configuration parameter issued by the first base station; wherein the common conditional handover configuration parameter includes: second measurement configuration parameters and second conditional handover configuration parameters; after measuring the neighboring cell according to the first measurement configuration parameter, the method further includes: determining that the second neighboring cell satisfies the second handover according to the measurement result and the first measurement configuration parameter. In the case of conditional handover, handover to the third base station corresponding to the second neighboring cell according to the second conditional handover configuration parameter; and send a common conditional handover reconfiguration completion message to the third base station.

In some exemplary embodiments, the second measurement configuration parameter includes: information characterizing the neighboring cells of the main carrier that need to be measured, and a first threshold.

In some exemplary embodiments, the second conditional handover configuration parameters include: air interface resource configuration parameters of the target cell and bearer information configuration parameters of the target cell.

In some exemplary embodiments, the second neighboring cell is a same-coverage carrier aggregation cell or a different-coverage carrier aggregation cell.

In some exemplary embodiments, determining that the second neighboring cell satisfies the second handover condition according to the measurement result and the first measurement configuration parameter includes: the first time is later than the second time; wherein the first time is the secondary switching condition of the first neighboring cell. The time when the received signal strength of the carrier meets the second threshold, and the second time is the time when the difference between the received signal strength of the main carrier of the first neighboring cell and the received signal strength of the main carrier of the cell corresponding to the first base station meets the first threshold. ; Or, the first time is the time when the difference between the received signal strength of the secondary carrier of the first neighboring cell and the received signal strength of the secondary carrier of the cell corresponding to the first base station meets the second threshold, and the second time is the time when the first neighboring cell The time when the difference between the received signal strength of the main carrier and the received signal strength of the main carrier of the cell corresponding to the first base station satisfies the first threshold.

In some exemplary embodiments, the difference between the received signal strength of the secondary carrier of the first neighbor cell and the received signal strength of the secondary carrier of the cell corresponding to the first base station that satisfies the second threshold includes: The difference between the received signal strength of the secondary carrier of the area and the received signal strength of the secondary carrier of the cell corresponding to the first base station is greater than the second threshold.

In some exemplary embodiments, the common condition handover configuration parameters further include: second secondary carrier deletion configuration parameters; before sending the common condition handover reconfiguration completion message to the third base station, the method further includes: deleting the configuration according to the second secondary carrier. Parameter to delete secondary carrier.

In some exemplary embodiments, the second secondary carrier deletion configuration parameters include: deletion configuration parameters of all secondary carriers that have been added. For example, the second secondary carrier deletion configuration parameters include: cell indexes of all secondary carriers that have been added.

In some exemplary embodiments, according to the provisions in the protocol, when the second measurement configuration parameter is used to measure the main carrier of a neighboring cell, the second measurement configuration parameter refers to the condition A3 (condition A3) measurement configuration parameter, which is the same as condition A3. The first condition switching configuration parameter corresponding to the A3 measurement configuration parameter refers to the condition switching configuration parameter corresponding to condition A3. The first threshold in the condition A3 measurement configuration parameter refers to the threshold of condition A3. The first condition switching configuration parameter corresponding to the condition A3 measurement configuration parameter The configuration parameters for secondary carrier deletion refer to the configuration parameters for secondary carrier deletion corresponding to condition A3.

In some exemplary embodiments, the third base station is a base station that supports the CA function, and the terminal accessed by the third base station can increase the peak traffic of the user by adding a secondary carrier.

The following is a specific implementation of the method for realizing conditional switching according to the embodiment of the present disclosure in a specific application scenario. The examples listed are only for illustrating the method for realizing conditional switching according to the embodiment of the present disclosure. Specific applications in different application scenarios are not used to limit the scope of protection of the embodiments of the present disclosure.

Example 1

This example describes the application scenario of handover from a single-carrier cell to a same-coverage CA cell.

As shown in Figure 2, in this example, the cell corresponding to the first base station gNB1 that the terminal accesses is a single-carrier cell. When the terminal accesses the cell corresponding to the first base station gNB1, no secondary carrier will be added. The first neighboring cell is In the same coverage CA cell, terminals accessing the first neighboring cell can directly add secondary carriers without performing secondary carrier measurements.

In this example, the terminal moves in the direction of the arrow after completing the initial access to the first base station gNB1. As the terminal continues to approach the second base station gNB2, the enhanced conditional handover is triggered, and finally the handover and secondary carrier addition are completed on the second base station gNB2. As shown in Figure 3, it specifically includes:

Step 301: The terminal completes initial access to the first base station gNB1. Since the cell corresponding to the first base station gNB1 is a single-carrier cell, the terminal only accesses the main carrier of the cell corresponding to the first base station gNB1 without adding any secondary carriers. carrier.

Step 302: After the first base station gNB1 completes the initial access, the terminal receives the enhanced conditional handover configuration parameters issued by the first base station gNB1. The enhanced conditional handover configuration parameters at least include the following configuration parameters:

a, condition A3 measurement configuration parameters;

b, condition switching configuration parameters corresponding to condition A3;

c, Configuration parameters added to the secondary carrier corresponding to condition A3.

In this example, the condition A3 measurement configuration parameters include: information characterizing the neighboring cells that need to measure the main carrier and the threshold of condition A3.

The information characterizing the neighboring cells that need to measure the main carrier includes, for example, the information of the cell corresponding to the second base station gNB2.

In this example, the conditional handover configuration parameters corresponding to condition A3 include: the air interface resource configuration parameters of the target cell and the bearer information configuration parameters of the target cell. The target cell includes, for example, a cell corresponding to the second base station gNB2.

In this example, the configuration parameters added to the secondary carrier corresponding to condition A3 include: required Added configuration parameters of all secondary carriers corresponding to the measured neighboring cells. For example, the added configuration parameters of the secondary carrier include: air interface resource configuration parameters of the cell corresponding to the secondary carrier, and bearer information configuration parameters of the cell corresponding to the secondary carrier.

Step 303: After receiving the enhanced conditional handover configuration parameters, the terminal measures the received signal strength of the main carrier of the neighboring cell according to the condition A3 measurement configuration parameters.

In this example, the main carrier of the neighboring cell includes, for example, the main carrier PCell-2 of the second base station gNB2.

Step 304: As the terminal continues to move toward the second base station gNB2, the received signal strength of the main carrier PCell-1 of the first base station gNB1 gradually becomes weaker, and the received signal strength of the main carrier PCell-2 of the second base station gNB2 gradually increases until At a certain moment, the difference between the received signal strength of the main carrier PCell-2 of the second base station gNB2 and the received signal strength of the main carrier PCell-1 of the first base station gNB1 is greater than the threshold of condition A3, and the terminal begins to perform enhanced conditional handover.

Step 305: The terminal switches the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the condition switching configuration parameters corresponding to condition A3, and according to the configuration added by the secondary carrier corresponding to condition A3 Parameters are used to add a secondary carrier to the secondary carrier SCell-2 of the second base station gNB2.

In this example, the terminal performs handover from the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the conditional handover configuration parameters corresponding to condition A3, including: according to the data of the cell corresponding to the second base station gNB2. Bearer information configuration parameters change the bearer information to the bearer information of the cell corresponding to the second base station gNB2, adjust the air interface timing to the cell corresponding to the second base station gNB2 according to the measurement results, and update the air interface according to the air interface resource configuration parameters of the cell corresponding to the second base station gNB2 The resource information is the air interface resource information of the cell corresponding to the second base station gNB2.

In this example, adding a secondary carrier to the secondary carrier SCell-2 of the second base station gNB2 according to the configuration parameters of the secondary carrier addition corresponding to condition A3 includes: configuring the newly added secondary carrier according to the bearer information configuration parameters of the cell corresponding to the second base station gNB2. The secondary carrier establishes bearer information, allocates air interface resources to the newly added secondary carrier according to the air interface resource configuration parameters of the cell corresponding to the second base station gNB2, and synchronizes downlink timing. The newly added secondary carrier may be, for example, the secondary carrier SCell-2 of the second base station gNB2.

Step 306: After completing the handover and adding the secondary carrier, the terminal replies an enhanced conditional handover reconfiguration completion message to the second base station gNB2. The enhanced conditional handover reconfiguration completion message indicates that the terminal has successfully performed an enhanced conditional handover.

Step 307: After receiving the enhanced conditional handover reconfiguration completion message, the second base station gNB2 recognizes that the terminal has successfully performed the enhanced conditional handover in this cell, allocates the primary carrier and secondary carrier resources to the terminal and completes the enhanced conditional handover. The entire process of switching.

Example 2

This example describes the application scenario of handover from a single carrier cell to a CA cell with different coverage.

As shown in Figure 4, in this example, the cell corresponding to the first base station gNB1 that the terminal accesses is a single-carrier cell. When the terminal accesses the cell corresponding to the first base station gNB1, no secondary carrier will be added. The first neighboring cell is In different coverage CA cells, terminals accessing the first neighboring cell cannot directly add a secondary carrier. Instead, the terminal needs to measure that the received signal strength of the secondary carrier meets a certain threshold before adding a secondary carrier.

In this example, base station gNB3 is the base station corresponding to the cell carrying secondary carrier SCell-2. Generally, the terminal cannot directly access base station gNB3 and can only access base station gNB3 by adding secondary carriers.

In this example, the terminal moves in the direction of the arrow after completing the initial access to the first base station gNB1. As the terminal continues to approach the second base station gNB2 and base station gNB3, an enhanced conditional handover or a normal conditional handover is triggered, and finally at the second base station gNB2 Complete handover and addition of secondary carrier.

These two situations are described below.

As shown in Figure 5, the enhanced conditional switching process specifically includes:

Step 501: The terminal completes initial access to the first base station gNB1. Since the cell corresponding to the first base station gNB1 is a single-carrier cell, the terminal only accesses the main carrier of the cell corresponding to the first base station gNB1 at this time without adding any secondary carriers. carrier.

Step 502: After the first base station gNB1 completes the initial access, the terminal receives the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters issued by the first base station gNB1. The enhanced conditional handover configuration parameters at least include the following configuration parameters:

a, condition A3 measurement configuration parameters and conditionA4 measurement configuration parameters;

b, condition switching configuration parameters corresponding to condition A3 and conditionA4;

c. Configuration parameters added to the auxiliary carrier corresponding to condition A3 and conditionA4.

Common conditional switching configuration parameters include at least the following configuration parameters:

a, conditionA3 measurement configuration parameters;

b. Condition switching configuration parameters corresponding to conditionA3.

In this example, the condition A3 measurement configuration parameters include: information characterizing the neighboring cells of the primary carrier that need to be measured and the threshold of conditionA3. The condition A4 measurement configuration parameters include: information characterizing the neighboring cells of the secondary carrier that need to be measured, and the second threshold.

The information indicating the neighboring cells that need to measure the primary carrier includes, for example, the information of the cells corresponding to the second base station gNB2. The information indicating the neighboring cells that need to measure the secondary carriers includes, for example, the information of the cells corresponding to the base station gNB3.

In this example, the conditional handover configuration parameters corresponding to condition A3 and conditionA4 include: the air interface resource configuration parameters of the target cell and the bearer information configuration parameters of the target cell. The target cell includes, for example, a cell corresponding to the second base station gNB2.

In this example, the configuration parameters added to the secondary carriers corresponding to condition A3 and conditionA4 include: the added configuration parameters of all secondary carriers corresponding to the neighboring cells that need to be measured. For example, the added configuration parameters of the secondary carrier include: air interface resource configuration parameters of the cell corresponding to the secondary carrier, and bearer information configuration parameters of the cell corresponding to the secondary carrier.

Step 503: After receiving the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters, the terminal measures the received signal strength of the main carrier of the neighboring cell according to the condition A3 measurement configuration parameter, and measures the received signal strength of the neighboring cell according to the condition A4 measurement configuration parameter. The received signal strength of the secondary carrier is measured.

In this example, the main carrier of the neighboring cell includes, for example, the main carrier PCell-2 of the second base station gNB2, The secondary carrier of the neighboring cell includes, for example, the secondary carrier SCell-2 of the base station gNB3.

Step 504: As the terminal continues to move toward the second base station gNB2 and base station gNB3, the received signal strength of the main carrier PCell-1 of the first base station gNB1 gradually becomes weaker, and the strength of the main carrier PCell-2 of the second base station gNB2 and the auxiliary signal of the base station gNB3 gradually weakens. The received signal strength of carrier SCell-2 gradually increases until a certain moment is met when the first time is earlier than the second time, and the terminal begins to perform enhanced conditional handover; among which, the first time is the reception of auxiliary carrier SCell-2 of base station gNB3 The signal strength is greater than the threshold of conditionA4. The second time is when the difference between the received signal strength of the main carrier PCell-2 of the second base station gNB2 and the received signal strength of the main carrier PCell-1 of the first base station gNB1 is greater than the threshold of condition A3.

Step 505: The terminal switches the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the condition switching configuration parameters corresponding to condition A3 and conditionA4. The configuration parameters of carrier addition are used to add the secondary carrier of the secondary carrier SCell-2 of the base station gNB3.

In this example, the terminal switches the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the conditional switching configuration parameters corresponding to condition A3 and conditionA4, including: according to the conditional switching configuration parameters corresponding to the second base station gNB2 The bearer information configuration parameters of the cell change the bearer information to the bearer information of the cell corresponding to the second base station gNB2, adjust the air interface timing to the cell corresponding to the second base station gNB2 according to the measurement results, and configure the air interface resources according to the air interface resource configuration parameters of the cell corresponding to the second base station gNB2. Update the air interface resource information to the air interface resource information of the cell corresponding to the second base station gNB2.

In this example, adding a secondary carrier to the secondary carrier SCell-2 of the base station gNB3 based on the configuration parameters of the secondary carrier corresponding to condition A3 and conditionA4 includes: configuring parameters for the newly added secondary carrier based on the bearer information of the cell corresponding to the base station gNB3. Establish bearer information, allocate air interface resources to the newly added secondary carrier according to the air interface resource configuration parameters of the cell corresponding to base station gNB3, and synchronize downlink timing. The newly added secondary carrier may be, for example, the secondary carrier SCell-2 of the base station gNB3.

Step 506: After completing the handover and adding the secondary carrier, the terminal replies an enhanced conditional handover reconfiguration completion message to the second base station gNB2. The enhanced conditional handover reconfiguration completion message indicates that the terminal has successfully performed an enhanced conditional handover.

Step 507: After receiving the enhanced conditional handover reconfiguration completion message, the second base station gNB2 recognizes that the terminal has successfully performed the enhanced conditional handover in this cell, allocates the resources of the primary carrier and the secondary carrier to the terminal and completes the enhanced conditional handover. The entire process of switching.

As shown in Figure 6, the ordinary conditional switching process specifically includes:

Step 601: The terminal completes initial access to the first base station gNB1. Since the cell corresponding to the first base station gNB1 is a single-carrier cell, the terminal only accesses the main carrier of the cell corresponding to the first base station gNB1 at this time without adding any secondary carriers. carrier.

Step 602: After the first base station gNB1 completes the initial access, the terminal receives the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters issued by the first base station gNB1. The enhanced conditional handover configuration parameters at least include the following configuration parameters:

a, conditionA3 measurement configuration parameters;

b. Condition switching configuration parameters corresponding to conditionA3.

In this example, the conditional handover configuration parameters corresponding to condition A3 and conditionA4 include: air interface resource configuration parameters of the target cell and bearer information configuration parameters of the target cell. Target The cell includes, for example, a cell corresponding to the second base station gNB2.

Step 603: After receiving the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters, the terminal measures the received signal strength of the main carrier of the neighboring cell according to the condition A3 measurement configuration parameter, and measures the received signal strength of the neighboring cell according to the condition A4 measurement configuration parameter. The received signal strength of the secondary carrier is measured.

In this example, the primary carrier of the adjacent cell includes, for example, the primary carrier PCell-2 of the second base station gNB2, and the secondary carrier of the adjacent cell includes, for example, the secondary carrier SCell-2 of the base station gNB3.

Step 604: As the terminal continues to move toward the second base station gNB2 and base station gNB3, the received signal strength of the main carrier PCell-1 of the first base station gNB1 gradually becomes weaker, and the received signal strength of the main carrier PCell-2 of the second base station gNB2 and the auxiliary carrier PCell-2 of the base station gNB3 gradually weakens. The received signal strength of carrier SCell-2 gradually increases until a certain moment is met when the first time is later than the second time, and the terminal begins to perform enhanced conditional handover; among which, the first time is the reception of auxiliary carrier SCell-2 of base station gNB3 The signal strength is greater than the threshold of conditionA4. The second time is when the difference between the received signal strength of the main carrier PCell-2 of the second base station gNB2 and the received signal strength of the main carrier PCell-1 of the first base station gNB1 is greater than the threshold of condition A3.

Step 605: The terminal switches the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the conditional switching configuration parameters corresponding to condition A3.

Step 606: After completing the handover, the terminal returns a normal conditional handover reconfiguration completion message to the second base station gNB2. The normal conditional handover reconfiguration completion message indicates that the terminal has successfully performed a normal conditional handover.

Step 607: After receiving the normal conditional handover reconfiguration completion message, the second base station gNB2 recognizes that the terminal has successfully performed the enhanced conditional handover in this cell, allocates the resources of the main carrier to the terminal and completes all the normal conditional handover. process.

Step 608: Since the cell corresponding to the second base station gNB2 is a CA networking cell, the terminal does not add any secondary carrier when completing the normal condition handover. Therefore, the second base station gNB2 continues to deliver the conditionA4 measurement configuration parameters of the secondary carrier, so that The terminal monitors the received signal strength of the auxiliary carrier in real time.

Step 609: As the terminal continues to move toward base station gNB3, the received signal strength of the secondary carrier of base station gNB3 is greater than the threshold of conditionA4, and the terminal reports the A4 measurement report to the second base station gNB2.

Step 610: After receiving the A4 measurement report of the terminal, the second base station gNB2 issues the secondary carrier addition configuration parameters to the terminal. The terminal adds the secondary carrier Scell-2 according to the secondary carrier addition configuration parameters and finally completes the secondary carrier addition process.

Example 3

This example describes the application scenario of handover from one CA cell to another CA cell with the same coverage.

As shown in Figure 7, in this example, the cell corresponding to the first base station gNB1 that the terminal accesses is a CA cell. The terminal can add a secondary carrier after accessing the cell corresponding to the first base station gNB1. The first neighboring cell has the same coverage. In a CA cell, terminals accessing the first neighboring cell can directly add secondary carriers without performing secondary carrier measurements.

In this example, the terminal moves in the direction of the arrow after completing the initial access to the first base station gNB1. As the terminal continues to approach the second base station gNB2, the enhanced conditional handover is triggered, and finally the handover and secondary carrier change are completed on the second base station gNB2. As shown in Figure 8, it specifically includes:

Step 801: The terminal completes initial access to the first base station gNB1 and successfully adds the secondary carrier SCell-1.

Step 802: After the first base station gNB1 completes the initial access, the terminal receives the enhanced conditional handover configuration parameters issued by the first base station gNB1. The enhanced conditional handover configuration parameters at least include the following configuration parameters:

a, condition A3 measurement configuration parameters;

b, condition switching configuration parameters corresponding to condition A3;

c, Configuration parameters of secondary carrier deletion corresponding to condition A3;

d, Configuration parameters added to the secondary carrier corresponding to condition A3.

In this example, the configuration parameters for secondary carrier deletion corresponding to condition A3 include: the deletion configuration parameters for all secondary carriers that have been added. For example, the first secondary carrier deletion configuration parameters include: cell indexes of all secondary carriers that have been added.

In this example, the configuration parameters added to the secondary carrier corresponding to condition A3 include: the added configuration parameters of all secondary carriers corresponding to the neighboring cells that need to be measured. For example, the added configuration parameters of the secondary carrier include: air interface resource configuration parameters of the cell corresponding to the secondary carrier, and bearer information configuration parameters of the cell corresponding to the secondary carrier.

Step 803: After receiving the enhanced conditional handover configuration parameters, the terminal measures the received signal strength of the main carrier of the neighboring cell according to the condition A3 measurement configuration parameters.

Step 804: As the terminal continues to move toward the second base station gNB2, the received signal strength of the main carrier PCell-1 of the first base station gNB1 gradually becomes weaker, and the received signal strength of the main carrier PCell-2 of the second base station gNB2 gradually increases until The main carrier PCell-2 of the second base station gNB2 at a certain time The difference between the received signal strength of the first base station gNB1 and the received signal strength of the main carrier PCell-1 of the first base station gNB1 is greater than the threshold of condition A3, and the terminal starts to perform enhanced conditional handover.

Step 805: The terminal switches the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the condition switching configuration parameters corresponding to condition A3, and deletes the secondary carrier according to the configuration corresponding to condition A3. Parameters are used to delete the secondary carrier SCell-1 of the first base station gNB1, and add the secondary carrier SCell-2 of the second base station gNB2 according to the configuration parameters of the secondary carrier addition corresponding to condition A3.

In this example, deleting the secondary carrier SCell-1 of the first base station gNB1 according to the configuration parameters of the secondary carrier deletion corresponding to condition A3 includes: releasing the bearer and air interface resources of the secondary carrier SCell-1 of the first base station gNB1.

In this example, adding the secondary carrier SCell-2 of the second base station gNB2 according to the configuration parameters of the secondary carrier addition corresponding to condition A3 includes: according to the bearer information configuration parameters of the cell corresponding to the second base station gNB2, the newly added The secondary carrier establishes bearer information, allocates air interface resources to the newly added secondary carrier according to the air interface resource configuration parameters of the cell corresponding to the second base station gNB2, and synchronizes downlink timing. The newly added secondary carrier may be, for example, the secondary carrier SCell-2 of the second base station gNB2.

Step 806: After completing the handover and secondary carrier change, the terminal returns an enhanced conditional handover reconfiguration completion message to the second base station gNB2. The enhanced conditional handover reconfiguration completion message indicates that the terminal has successfully performed an enhanced conditional handover.

Step 807: After receiving the enhanced conditional handover reconfiguration completion message, the second base station gNB2 recognizes that the terminal has successfully performed enhanced conditional handover in this cell, and allocates the primary carrier and secondary carrier to the terminal. After obtaining the carrier resources, the entire process of this enhanced conditional handover is completed.

Example 4

This example describes the application scenario of handover from one CA cell to another CA cell with different coverage.

As shown in Figure 9, in this example, the cell corresponding to the first base station gNB1 that the terminal accesses is a CA cell. The terminal can add a secondary carrier after accessing the cell corresponding to the first base station gNB1. The first neighboring cell has different coverage. In a CA cell, a terminal accessing the first neighboring cell cannot directly add a secondary carrier. Instead, the terminal needs to measure that the received signal strength of the secondary carrier meets a certain threshold before adding a secondary carrier.

These two situations are described below.

As shown in Figure 10, the enhanced conditional switching process specifically includes:

Step 1001: The terminal completes initial access to the first base station gNB1 and successfully adds the secondary carrier SCell-1.

Step 1002: After the first base station gNB1 completes the initial access, the terminal receives the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters issued by the first base station gNB1. The enhanced conditional handover configuration parameters at least include the following configuration parameters:

a, condition A3 measurement configuration parameters and conditionA6 measurement configuration parameters;

b, condition switching configuration parameters corresponding to condition A3 and conditionA6;

c, Configuration parameters of secondary carrier deletion corresponding to condition A3 and conditionA6;

d. Configuration parameters added to the auxiliary carrier corresponding to condition A3 and conditionA6.

a, conditionA3 measurement configuration parameters;

b, condition switching configuration parameters corresponding to conditionA3;

c, Configuration parameters of secondary carrier deletion corresponding to condition A3.

In this example, the condition A3 measurement configuration parameters include: information characterizing the neighboring cells of the primary carrier that need to be measured and the threshold of conditionA3. The condition A6 measurement configuration parameters include: information characterizing the neighboring cells of the secondary carrier that need to be measured, and the second threshold.

In this example, the conditional handover configuration parameters corresponding to condition A3 and conditionA6 include: the air interface resource configuration parameters of the target cell and the bearer information configuration parameters of the target cell. The target cell includes, for example, a cell corresponding to the second base station gNB2.

In this example, the configuration parameters for deletion of secondary carriers corresponding to condition A3 and conditionA6 include: the deletion configuration parameters of all secondary carriers that have been added. For example, the first secondary carrier deletion configuration parameters include: cell indexes of all secondary carriers that have been added.

In this example, the configuration parameters added by the CA corresponding to condition A3 and conditionA6 include: the added configuration parameters of all secondary carriers corresponding to the neighboring cells that need to be measured. For example, the added configuration parameters of the secondary carrier include: air interface resource configuration parameters of the cell corresponding to the secondary carrier, and bearer information configuration parameters of the cell corresponding to the secondary carrier.

Step 1003: After receiving the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters, the terminal measures the received signal strength of the main carrier of the neighboring cell according to the condition A3 measurement configuration parameter, and measures the received signal strength of the neighboring cell according to the condition A6 measurement configuration parameter. The received signal strength of the secondary carrier is measured.

Step 1004, as the terminal continues to move toward the second base station gNB2 and base station gNB3, the received signal strength of the main carrier PCell-1 and the secondary carrier SCell-1 of the first base station gNB1 gradually becomes weaker, and the main carrier PCell-1 of the second base station gNB2 2 and the received signal strength of the secondary carrier SCell-2 of the base station gNB3 gradually increases, until at a certain moment the first time is earlier than the second time, the terminal starts to perform enhanced conditional handover; among which, the first time is the secondary carrier of the base station gNB3. The difference between the received signal strength of carrier SCell-2 and the received signal strength of secondary carrier SCell-1 of first base station gNB1 is greater than the threshold of conditionA6. The second time is the difference between the received signal strength of main carrier PCell-2 of second base station gNB2 and The difference in received signal strength of the main carrier PCell-1 of the first base station gNB1 is greater than the threshold of condition A3.

Step 1005: The terminal switches the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the condition switching configuration parameters corresponding to condition A3 and conditionA6. The configuration parameters of carrier deletion are used to delete the secondary carrier of the secondary carrier SCell-1 of the first base station gNB1, and the secondary carrier of the secondary carrier SCell-2 of the base station gNB3 is added according to the configuration parameters of the secondary carrier addition corresponding to condition A3 and conditionA6.

In this example, the terminal performs switching from the main carrier PCell-1 of the first base station gNB1 to the main carrier PCell-2 of the second base station gNB2 according to the conditional handover configuration parameters corresponding to condition A3 and conditionA6, including: according to the conditions corresponding to the second base station gNB2 The bearer information configuration parameters of the cell change the bearer information to the bearer information of the cell corresponding to the second base station gNB2, adjust the air interface timing to the cell corresponding to the second base station gNB2 according to the measurement results, and configure the air interface resources according to the air interface resource configuration parameters of the cell corresponding to the second base station gNB2. Update the air interface resource information to the air interface resource information of the cell corresponding to the second base station gNB2.

In this example, deleting the secondary carrier SCell-1 of the first base station gNB1 according to the configuration parameters of the secondary carrier deletion corresponding to condition A3 and conditionA6 includes: releasing the bearer and air interface of the secondary carrier SCell-1 of the first base station gNB1 resource.

In this example, adding a secondary carrier to the secondary carrier SCell-2 of the base station gNB3 based on the configuration parameters of the secondary carrier addition corresponding to condition A3 and conditionA6 includes: configuring parameters for the newly added secondary carrier based on the bearer information of the cell corresponding to the base station gNB3. Create bearer information, Allocate air interface resources to the newly added secondary carrier according to the air interface resource configuration parameters of the cell corresponding to the base station gNB3, and synchronize the downlink timing. The newly added secondary carrier may be, for example, the secondary carrier SCell-2 of the base station gNB3.

Step 1006: After completing the handover and secondary carrier change, the terminal returns an enhanced conditional handover reconfiguration completion message to the second base station gNB2. The enhanced conditional handover reconfiguration completion message indicates that the terminal has successfully performed an enhanced conditional handover.

Step 1007: After receiving the enhanced conditional handover reconfiguration completion message, the second base station gNB2 recognizes that the terminal has successfully performed the enhanced conditional handover in this cell, allocates the primary carrier and secondary carrier resources to the terminal and completes the enhanced conditional handover. The entire process of switching.

As shown in Figure 11, the ordinary conditional switching process specifically includes:

Step 1101: The terminal completes initial access to the first base station gNB1 and successfully adds the secondary carrier SCell-1.

Step 1102: After the first base station gNB1 completes the initial access, the terminal receives the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters issued by the first base station gNB1. The enhanced conditional handover configuration parameters at least include the following configuration parameters:

c. Configuration parameters added to the auxiliary carrier corresponding to condition A3 and conditionA6.

a, conditionA3 measurement configuration parameters;

b, condition switching configuration parameters corresponding to conditionA3;

The information representing the neighboring cells that need to measure the primary carrier includes, for example, the information of the cells corresponding to the second base station gNB2. The information representing the neighboring cells that need to measure the secondary carriers includes, for example, the information of the cells corresponding to the base station gNB3. Community information.

In this example, the configuration parameters added to the secondary carriers corresponding to condition A3 and conditionA6 include: the added configuration parameters of all secondary carriers corresponding to the neighboring cells that need to be measured. For example, the added configuration parameters of the secondary carrier include: air interface resource configuration parameters of the cell corresponding to the secondary carrier, and bearer information configuration parameters of the cell corresponding to the secondary carrier.

Step 1103: After receiving the enhanced conditional handover configuration parameters and the ordinary conditional handover configuration parameters, the terminal measures the received signal strength of the main carrier of the neighboring cell according to the condition A3 measurement configuration parameter, and measures the received signal strength of the neighboring cell according to the condition A6 measurement configuration parameter. The received signal strength of the secondary carrier is measured.

Step 1104: As the terminal continues to move toward the second base station gNB2 and base station gNB3, the received signal strength of the main carrier PCell-1 of the first base station gNB1 gradually becomes weaker, and the strength of the main carrier PCell-2 of the second base station gNB2 and the auxiliary signal of the base station gNB3 gradually weakens. The received signal strength of carrier SCell-2 gradually increases until a certain moment is met when the first time is later than the second time, and the terminal begins to perform enhanced conditional handover; among which, the first time is the reception of auxiliary carrier SCell-2 of base station gNB3 The difference between the signal strength and the received signal strength of the secondary carrier SCell-1 of the first base station gNB1 is greater than the threshold of conditionA6. The second time is when the received signal strength of the primary carrier PCell-2 of the second base station gNB2 is different from the primary carrier PCell-1 of the first base station gNB1. The difference in received signal strength of carrier PCell-1 is greater than the threshold of condition A3.

Step 1105: The terminal switches the primary carrier PCell-1 of the first base station gNB1 to the primary carrier PCell-2 of the second base station gNB2 according to the conditional switching configuration parameters corresponding to condition A3, and deletes the secondary carrier according to the configuration corresponding to condition A3. parameters for the first base station gNB1 The secondary carrier of secondary carrier SCell-1 is deleted.

Step 1106: After completing the handover, the terminal returns a normal conditional handover reconfiguration completion message to the second base station gNB2. The normal conditional handover reconfiguration completion message indicates that the terminal has successfully performed a normal conditional handover.

Step 1107: After receiving the normal conditional handover reconfiguration completion message, the second base station gNB2 recognizes that the terminal has successfully performed enhanced conditional handover in this cell, allocates the main carrier resources to the terminal and completes all the normal conditional handover. process.

Step 1108: Since the cell corresponding to the second base station gNB2 is a CA networking cell, the terminal does not add any secondary carrier when completing the normal condition handover. Therefore, the second base station gNB2 continues to deliver the conditionA6 measurement configuration parameters of the secondary carrier, so that The terminal monitors the received signal strength of the auxiliary carrier in real time.

Step 1109, as the terminal continues to move toward the base station gNB3, the difference between the received signal strength of the secondary carrier of the base station gNB3 and the received signal strength of the secondary carrier SCell-1 of the first base station gNB1 is greater than the threshold of conditionA6, and the terminal moves to the second base station gNB2. Submit A6 measurement report.

Step 1110: After receiving the A6 measurement report of the terminal, the second base station gNB2 issues the secondary carrier addition configuration parameters to the terminal. The terminal adds the secondary carrier Scell-2 according to the secondary carrier addition configuration parameters and finally completes the secondary carrier addition process.

Example 5

This example describes the application scenario in Non-Stand Alone (NSA) mode where the master node (MN, Master Node) remains unchanged and the secondary node (SN, Secondary Node) switches from a single carrier cell to a same-coverage CA cell.

As shown in Figure 12, in this example, the evolved Node B (eNB, evolution NodeB) is the MN in the NSA, the first base station gNB1 and the second base station gNB2 are the SNs in the NSA, and the cell corresponding to the first base station gNB1 is In the single-carrier cell, the cell corresponding to the second base station gNB2 is a same-coverage CA cell.

In this example, the terminal completes the addition of SN at the first base station gNB1 after the eNB completes the initial access. The terminal does not add any secondary carrier when accessing the cell corresponding to the first base station gNB1. The first neighboring cell is a CA cell with the same coverage. , the terminal accessing the first neighboring cell can directly add the secondary carrier without performing secondary carrier measurement.

After the terminal completes the initial access to the first base station gNB1, it moves in the direction of the arrow. As the terminal continues to approach the second base station gNB2, the enhanced conditional handover is triggered, and finally the handover and secondary carrier addition are completed on the second base station gNB2, as shown in Figure 13 , specifically including:

Step 1301: The terminal completes the initial access to the eNB and successfully adds the first base station gNB1 as the SN. Since the cell corresponding to the first base station gNB1 is a single-carrier cell, the terminal only accesses the main cell of the cell corresponding to the first base station gNB1 at this time. carrier without adding any secondary carriers.

Step 1302: After the first base station gNB1 completes SN addition, the terminal receives the enhanced conditional handover configuration parameters issued by the first base station gNB1. The enhanced conditional handover configuration parameters at least include the following configuration parameters:

a, condition A3 measurement configuration parameters;

b, condition switching configuration parameters corresponding to condition A3;

Step 1303: After receiving the enhanced conditional handover configuration parameters, the terminal measures the received signal strength of the main carrier of the neighboring cell according to the condition A3 measurement configuration parameters.

In this example, the main carrier of the neighboring cell includes, for example, the main carrier PSCell-2 of the second base station gNB2.

Step 1304, as the terminal continues to move toward the second base station gNB2, the received signal strength of the main carrier PSCell-1 of the first base station gNB1 gradually becomes weaker, and the received signal strength of the main carrier PSCell-2 of the second base station gNB2 gradually increases until At a certain moment, the difference between the received signal strength of the main carrier PSCell-2 of the second base station gNB2 and the received signal strength of the main carrier PSCell-1 of the first base station gNB1 is greater than the threshold of condition A3, and the terminal begins to perform enhanced conditional handover.

Step 1305: The terminal switches the main carrier PSCell-1 of the first base station gNB1 to the main carrier PSCell-2 of the second base station gNB2 according to the condition switching configuration parameters corresponding to condition A3, and according to the configuration of the secondary carrier addition corresponding to condition A3 Parameters are used to add a secondary carrier to the secondary carrier SCell-2 of the second base station gNB2.

In this example, the terminal performs handover from the main carrier PSCell-1 of the first base station gNB1 to the main carrier PSCell-2 of the second base station gNB2 according to the conditional switching configuration parameters corresponding to condition A3, including: according to the switching of the main carrier PSCell-2 of the second base station gNB2. Bearer information configuration parameters change the bearer information to the bearer information of the cell corresponding to the second base station gNB2, adjust the air interface timing to the cell corresponding to the second base station gNB2 according to the measurement results, and update the air interface according to the air interface resource configuration parameters of the cell corresponding to the second base station gNB2 The resource information is the air interface resource information of the cell corresponding to the second base station gNB2.

In this example, adding the secondary carrier SCell-2 of the second base station gNB2 according to the configuration parameters of the secondary carrier addition corresponding to condition A3 includes: according to the second base station gNB2 The bearer information configuration parameters of the corresponding cell are used to establish bearer information for the newly added secondary carrier, and air interface resources are allocated to the newly added secondary carrier according to the air interface resource configuration parameters of the cell corresponding to the second base station gNB2, and the downlink timing is synchronized. The newly added secondary carrier may be, for example, the secondary carrier SCell-2 of the second base station gNB2.

Step 1306: After completing the handover and adding the secondary carrier, the terminal replies an enhanced conditional handover reconfiguration completion message to the second base station gNB2. The enhanced conditional handover reconfiguration completion message indicates that the terminal has successfully performed an enhanced conditional handover.

Step 1307: After receiving the enhanced conditional handover reconfiguration completion message, the second base station gNB2 recognizes that the terminal has successfully performed enhanced conditional handover in this cell, and allocates the resources of the primary carrier PSCell-2 and the secondary carrier Scell-2 to the terminal. Complete the entire process of this enhanced conditional switching.

In a second aspect, another embodiment of the present disclosure provides an electronic device, including: at least one processor; and a memory. At least one program is stored on the memory. When at least one program is executed by at least one processor, any of the above is implemented. Method to implement conditional switching.

Among them, the processor is a device with data processing capabilities, including but not limited to a central processing unit (CPU), etc.; the memory is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically such as SDRAM). , DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH).

In some embodiments, the processor and memory are connected to each other through a bus, and then to other components of the computing device.

In a third aspect, another embodiment of the present disclosure provides a computer-readable medium. A computer program is stored on the computer-readable medium. When the computer program is executed by a processor, any one of the above methods for realizing conditional switching is implemented.

In the fourth aspect, referring to Figure 14, another embodiment of the present disclosure provides a device for implementing conditional handover, including: a receiving module 1401, configured to receive enhanced conditional handover configuration parameters issued by the first base station; wherein, the enhanced Type conditional handover configuration parameters include: first measurement configuration parameters, first conditional handover configuration parameters, and secondary carrier addition configuration parameters; measurement module 1402, used to measure neighboring cells according to the first measurement configuration parameters; handover module 1403, for use in measurements based on When the result and the first measurement configuration parameter determine that the first neighboring cell satisfies the first handover condition, the handover configuration parameters are switched to the second base station corresponding to the first neighboring cell according to the first condition. Carrier addition configuration parameters are used to add a secondary carrier; and an enhanced conditional handover reconfiguration completion message is sent to the second base station.

The measurement module 1402 is specifically configured to implement the measurement of neighboring cells according to the first measurement configuration parameter in the following manner: measuring the main carrier of the neighboring cell corresponding to the information characterizing the neighboring cell that needs to measure the main carrier.

The switching module 1403 is specifically configured to determine that the first neighboring cell satisfies the first switching condition based on the measurement result and the first measurement configuration parameter in the following manner: the received signal strength of the main carrier of the first neighboring cell is consistent with the first measurement configuration parameter. The difference in received signal strength of the main carrier of the cell corresponding to the first base station satisfies the first threshold.

The measurement module 1402 is specifically configured to implement the measurement of neighboring cells according to the first measurement configuration parameter in the following manner: measuring the main carrier of the neighboring cell corresponding to the information characterizing the neighboring cell that needs to measure the main carrier; The characterization requires measurement of the secondary carrier of the adjacent cell corresponding to the information of the adjacent cell of the secondary carrier.

The switching module 1403 is specifically configured to determine that the first neighboring cell satisfies the first switching condition based on the first measurement result and the first measurement configuration parameter in the following manner: the first time is earlier than the second time.

Wherein, the first time is the time when the received signal strength of the secondary carrier of the first neighboring cell meets the second threshold, and the second time is the time when the received signal strength of the main carrier of the first neighboring cell is equal to The time when the difference in received signal strength of the main carrier of the cell corresponding to the first base station meets the first threshold;

Alternatively, the first time is the received signal strength of the secondary carrier of the first neighboring cell and the The difference in received signal strength of the secondary carrier of the cell corresponding to the first base station satisfies the second threshold. The second time is the received signal strength of the primary carrier of the first neighboring cell and the first base station. The time when the difference in received signal strength of the main carrier of the corresponding cell meets the first threshold.

In some exemplary embodiments, the additional configuration parameters of the secondary carrier include: additional configuration parameters of all secondary carriers corresponding to the neighboring cells that need to be measured.

The switching module 1403 is specifically configured to implement the secondary carrier addition according to the secondary carrier addition configuration parameters in the following manner: perform the secondary carrier addition according to all secondary carrier addition configuration parameters corresponding to the first neighboring cell.

In some exemplary embodiments, the first neighboring cell is a carrier aggregation cell with same coverage or a carrier aggregation cell with different coverage.

The switching module 1403 is also configured to: when it is determined that the first neighboring cell satisfies the first switching condition according to the first measurement result and the first measurement configuration parameter, delete the secondary carrier according to the first secondary carrier deletion configuration parameter.

In some exemplary embodiments, the first secondary carrier deletion configuration parameters include: deletion configuration parameters of all secondary carriers that have been added.

The switching module 1403 is specifically configured to implement the deletion of the secondary carrier according to the deletion configuration parameters of the first secondary carrier in the following manner: deleting all the added secondary carriers according to the deletion configuration parameters of all the added secondary carriers.

In some exemplary embodiments, the receiving module 1401 is further configured to: receive a common conditional handover configuration parameter issued by the first base station; wherein the common conditional handover configuration parameter includes: a second measurement configuration parameter, a third Two-condition handover configuration parameters and second secondary carrier deletion configuration parameters.

The switching module 1403 is also configured to: when it is determined that the second neighboring cell satisfies the second switching condition according to the measurement result and the first measurement configuration parameter, switch to the second neighboring cell according to the second condition switching configuration parameter. The corresponding third base station deletes the configuration parameters according to the second secondary carrier. Deleting the secondary carrier; sending a normal conditional handover reconfiguration completion message to the third base station.

The specific implementation process of the device for realizing conditional switching is the same as the specific implementation process of the method for realizing conditional switching in the previous embodiment, and will not be described again here.

Those of ordinary skill in the art can understand that all or some steps, systems, and functional modules/units in the devices disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may consist of several physical components. Components execute cooperatively. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes volatile and nonvolatile media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. removable, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cassettes, tapes, disk storage or other magnetic storage, or may be used Any other medium that stores the desired information and can be accessed by a computer. Additionally, it is known to those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted in a general illustrative sense only and not for purpose of limitation. In some instances, it will be apparent to those skilled in the art that features, characteristics and/or elements described in connection with a particular embodiment may be used alone, or may be used in conjunction with other embodiments, unless expressly stated otherwise. Features and/or components used in combination. Accordingly, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

A method to implement conditional switching, including:

Receive enhanced conditional handover configuration parameters issued by the first base station; wherein the enhanced conditional handover configuration parameters include: first measurement configuration parameters, first conditional handover configuration parameters, and secondary carrier addition configuration parameters;

Measure neighboring cells according to the first measurement configuration parameters;

When it is determined that the first neighboring cell satisfies the first handover condition according to the measurement result and the first measurement configuration parameter, the handover configuration parameter is switched to the second base station corresponding to the first neighboring cell according to the first condition. The auxiliary carrier adds configuration parameters to add the auxiliary carrier;

Send an enhanced conditional handover reconfiguration completion message to the second base station.
The method for implementing conditional handover according to claim 1, wherein the first measurement configuration parameters include: information characterizing the neighboring cells where the main carrier needs to be measured, and a first threshold;

Measuring the neighboring cell according to the first measurement configuration parameter includes: measuring the main carrier of the neighboring cell corresponding to the information characterizing the neighboring cell that needs to measure the main carrier;

Determining that the first neighboring cell satisfies the first handover condition based on the measurement results and the first measurement configuration parameter includes: the received signal strength of the main carrier of the first neighboring cell is equal to the main carrier of the cell corresponding to the first base station. The difference in received signal strength satisfies the first threshold.
The method for implementing conditional handover according to claim 1, wherein the first measurement configuration parameters include: information characterizing the neighboring cells of the primary carrier that need to be measured, a first threshold, information characterizing the neighboring cells of the secondary carrier that need to be measured, second threshold;

Measuring the neighboring cell according to the first measurement configuration parameter includes: measuring the main carrier of the neighboring cell corresponding to the information indicating that the neighboring cell of the main carrier needs to be measured; measuring the neighboring cell that represents the need to measure the secondary carrier. Measure the secondary carrier of the neighboring cell corresponding to the cell information;

Determining that the first neighbor cell satisfies the first handover condition based on the first measurement result and the first measurement configuration parameter includes: the first time is earlier than the second time;

Wherein, the first time is the time when the received signal strength of the secondary carrier of the first neighboring cell meets the second threshold, and the second time is the time when the received signal strength of the main carrier of the first neighboring cell is equal to The time when the difference in received signal strength of the main carrier of the cell corresponding to the first base station meets the first threshold;

Alternatively, the first time is the time when the difference between the received signal strength of the secondary carrier of the first neighboring cell and the received signal strength of the secondary carrier of the cell corresponding to the first base station satisfies the second threshold, so The second time is the time when the difference between the received signal strength of the main carrier of the first neighboring cell and the received signal strength of the main carrier of the cell corresponding to the first base station satisfies the first threshold.
The method for implementing conditional handover according to claim 1, wherein the additional configuration parameters of the secondary carrier include: the additional configuration parameters of all secondary carriers corresponding to the neighboring cells that need to be measured;

The adding of secondary carriers according to the adding configuration parameters of the secondary carriers includes: adding the secondary carriers according to the adding configuration parameters of all secondary carriers corresponding to the first neighboring cell.
The method for implementing conditional handover according to claim 1, wherein the first neighboring cell is a same-coverage carrier aggregation cell or a different-coverage carrier aggregation cell.
According to the method for implementing conditional handover according to any one of claims 1 to 5, the enhanced conditional handover configuration parameters further include: first auxiliary carrier deletion configuration parameters;

When it is determined that the first neighboring cell satisfies the first handover condition according to the first measurement result and the first measurement configuration parameter, the method further includes: deleting the secondary carrier according to the first secondary carrier deletion configuration parameter.
The method for implementing conditional switching according to claim 6, wherein the first auxiliary load Wave deletion configuration parameters include: deletion configuration parameters of all secondary carriers that have been added;

Deleting the secondary carrier according to the deletion configuration parameters of the first secondary carrier includes deleting all the added secondary carriers according to the deletion configuration parameters of all the added secondary carriers.
The method for implementing conditional handover according to any one of claims 1 to 5, before measuring the neighboring cell according to the first measurement configuration parameter, the method further includes:

Receive the common conditional handover configuration parameters issued by the first base station; wherein the common conditional handover configuration parameters include: second measurement configuration parameters, second conditional handover configuration parameters and second secondary carrier deletion configuration parameters;

After measuring the neighboring cell according to the first measurement configuration parameter, the method further includes:

When it is determined that the second neighboring cell satisfies the second handover condition according to the measurement result and the first measurement configuration parameter, the handover configuration parameter is switched to the third base station corresponding to the second neighboring cell according to the second condition. The second auxiliary carrier deletes the configuration parameter to delete the auxiliary carrier;

Send a common conditional handover reconfiguration completion message to the third base station.
An electronic device including:

at least one processor;

A memory, on which at least one program is stored, when the at least one program is executed by the at least one processor, the method for implementing conditional switching described in any one of claims 1-8 is implemented.
A computer-readable medium. A computer program is stored on the computer-readable medium. When the computer program is executed by a processor, the method for realizing conditional switching according to any one of claims 1-8 is implemented.