WO2022111321A1 - Cell handover method, user equipment, and storage medium - Google Patents

Abstract

CELL HANDOVER METHOD, ELECTRONIC DEVICE AND STORAGE MEDIUM A cell handover method, a user equipment, and a storage medium. The method comprises: receiving configuration information of candidate cells and cell handover criterion information; the candidate cells at least comprising: AP cells; insofar as the AP cells are AP cells of a same frequency, the candidate cells also comprising a macrocell; insofar as the candidate cells only comprise the AP cells, the cell handover criterion information comprising: first cell handover criterion information corresponding to the AP cells; insofar as the candidate cells comprise a macrocell, the cell handover criterion information additionally comprising: second cell handover criterion information corresponding to the macrocell; and insofar as the AP cells satisfy a corresponding cell handover criterion, handing over to an AP cell satisfying the corresponding cell handover criterion. The application of the solution described above allows a UE to access an AP cell with priority, thus favoring the UE in maintaining stability.

Description

Cell handover method, user equipment and storage medium

This application claims the priority of the Chinese patent application with the application number 202011330887.2 and the invention titled "Cell Handover Method, User Equipment and Storage Medium" filed with the China Patent Office on November 24, 2020, the entire contents of which are incorporated herein by reference Applying.

technical field

The present invention relates to the field of communication technologies, and in particular, to a cell handover method, user equipment and storage medium.

Background technique

In recent years, mobile communication has begun to replace fixed-line communication, and the demand for high-quality voice, reliable service, and low prices is increasing. In addition to currently existing mobile phone networks, new classes of small cells have emerged that can be installed in residential or commercial locations to provide indoor wireless coverage for mobile units using existing broadband Internet connections. Such personal miniature base stations are generally referred to as wireless access point (Access Point, AP) base stations. The AP base station can be plug and play, which can reduce the cost of transmission and network planning.

A cell covered by an AP base station is called an AP cell. A cell covered by a macro base station is called a macro cell. In practical applications, user equipment (User Equipment, UE) in the AP cell can be connected to the core network through the AP base station. The UE in the macro cell can also be connected to the core network through the macro cell base station.

The 3rd generation partnership project (3GPP) has released the research standards for the 5th generation (5G), and 5GRel-16 introduces conditional handover (CHO), user equipment (User Equipment) , UE) autonomously decides the target cell to be handed over when the configured cell handover conditions are met.

However, using the above method for cell handover is not conducive to maintaining stable performance of the UE.

SUMMARY OF THE INVENTION

The problem to be solved by the present invention is: how to help the UE to maintain stable performance.

To solve the above problem, an embodiment of the present invention provides a cell handover method, the method includes:

Receive configuration information and cell handover condition information of the candidate cell; the candidate cell at least includes: an AP cell; when the AP cell is an intra-frequency AP cell, the candidate cell also includes a macro cell; When the selected cell includes only the AP cell, the cell handover condition information includes: first cell handover condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell handover condition information further includes : handover condition information of the second cell corresponding to the macro cell;

When the AP cell satisfies the corresponding cell handover condition, it switches to the AP cell that satisfies the corresponding cell handover condition.

Optionally, the cell handover condition information includes: first priority handover cell indication information, used to indicate that when a cell that satisfies the corresponding cell handover condition includes both the macro cell and the AP cell, the AP is preferentially handed over to the AP community.

Optionally, when the cell handover condition information includes first cell handover condition information, and the number of the AP cells is two or more, the first cell handover condition information corresponds to the AP cell one-to-one;

The first cell handover condition information corresponding to each AP cell includes: first priority handover cell indication information, which is used to indicate that when the cell that satisfies the corresponding cell handover condition includes both the macro cell and the AP cell, priority Handover to the AP cell.

Optionally, the first cell handover condition information corresponding to the intra-frequency AP cell includes: the quality of the target cell is better than the sum of the quality of the current cell and the first offset value;

The second cell handover condition information includes: the quality of the target cell is better than the sum of the quality of the current cell and the second offset value;

The first offset value is smaller than the second offset value.

Optionally, the first cell handover condition information corresponding to the same-frequency AP cell includes: the quality of the current cell is lower than the first preset quality threshold, and the quality of the target cell is greater than the second preset quality threshold;

The second cell handover condition information includes: the current cell quality is lower than the third preset quality threshold, and the target cell quality is greater than the fourth preset quality threshold;

Wherein, the first preset quality threshold is greater than the third preset quality threshold, and the second preset quality threshold is less than the fourth preset quality threshold; or, the first preset quality threshold is greater than the the third preset quality threshold; or, the second preset quality threshold is smaller than the fourth preset quality threshold.

Optionally, the first cell handover condition information corresponding to the same-frequency AP cell includes: the quality of the current cell is lower than the first preset quality threshold, and the quality of the target cell is greater than the second preset quality threshold; or, the quality of the target cell is excellent. at the sum of the current cell quality and the first offset value;

The second cell handover condition information includes: the current cell quality is lower than the first preset quality threshold, and the target cell quality is greater than the second preset quality threshold, and the target cell quality is better than the current cell quality and the first offset value. and.

Optionally, the measurement offset of the target cell in the first cell handover condition information is greater than the measurement offset of the target cell in the second cell handover condition information.

Optionally, the first cell handover condition information further includes: duration information that the same-frequency AP cell satisfies the corresponding cell handover condition;

The second cell handover condition information further includes: duration information that the macro cell satisfies the corresponding cell handover condition;

Wherein, the duration that the same-frequency AP cell satisfies the handover condition of the corresponding cell is less than the duration that the macro cell satisfies the handover condition of the corresponding cell.

Optionally, the AP cell is an inter-frequency AP cell.

Optionally, the first cell handover condition information corresponding to the inter-frequency AP cell includes: switching to the inter-frequency AP cell when the quality of the target cell is better than a preset quality threshold.

Optionally, the first cell handover condition information corresponding to the inter-frequency AP cell includes: switching to the inter-frequency AP cell when the target cell is the cell with the best quality among the cells corresponding to the frequency point where it is located.

Optionally, the first cell handover condition information corresponding to the inter-frequency AP cell includes: after the quality of the target cell is increased by a third offset value, when it is the cell with the best quality among the cells corresponding to the frequency point where it is located, switching to the inter-frequency AP cell.

Optionally, when the cell handover condition information only includes the first cell handover condition information or the second cell handover condition information, before performing the cell handover, the method further includes:

Based on the cell handover condition information, determine handover condition information of another cell except the cell corresponding to the cell handover condition information.

An embodiment of the present invention further provides a user equipment, where the user equipment includes:

a receiving unit, adapted to receive configuration information and cell handover condition information of the candidate cell; the candidate cell at least includes: an AP cell; when the AP cell is an AP cell of the same frequency, the candidate cell also includes a macro cell ; When the candidate cell only includes the AP cell, the cell handover condition information includes: first cell handover condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell The handover condition information further includes: second cell handover condition information corresponding to the macro cell;

The cell handover unit is adapted to switch to the AP cell that satisfies the corresponding cell handover condition when the AP cell satisfies the corresponding cell handover condition.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the steps of any one of the above-mentioned methods.

An embodiment of the present invention further provides a user equipment, including a memory and a processor, the memory stores a computer program that can run on the processor, and the processor executes any one of the two when running the computer program. the steps of the method.

Compared with the prior art, the technical solutions of the embodiments of the present invention have the following advantages:

By applying the solution of the present invention, when an AP cell is included in the candidate cells, if the AP cell satisfies the corresponding handover condition, the AP cell is preferentially handed over, so that the UE can connect to the core network through the AP base station. Since the AP base station is usually installed indoors, connecting to the core network through the AP base station can make the performance of the UE more stable.

Description of drawings

1 is a schematic diagram of signaling interaction for cell handover;

2 is a flowchart of a cell handover method in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a user equipment in an embodiment of the present invention.

Detailed ways

The introduction of conditional handover in 5GRel-16 is mainly to prevent the source base station from being unable to issue the handover command to the UE in time due to the extreme changes of the UE signal. The source base station is the base station corresponding to the cell currently accessed by the UE.

FIG. 1 is a schematic diagram of signaling interaction of existing cell condition handover. Referring to Figure 1, the specific signaling interaction process is as follows:

Step 101, the UE sends a measurement report to the source base station Source gNB.

Step 102, the source base station Source gNB judges whether the UE needs to perform cell condition handover.

When it is determined that the UE needs to perform cell handover, step 103 is performed.

Step 103, the source base station Source gNB sends a handover request to the target base station Target gNB.

Step 104, the target base station Target gNB judges whether the UE can be allowed to access.

When the target base station Target gNB determines that the UE can be allowed to access, step 105 is performed.

Step 105, the target base station Target gNB sends an access permission notification to the source base station Source gNB to inform the source base station Source gNB that the UE is allowed to access.

Step 106, the source base station Source gNB sends an RRC reconfiguration message to the UE.

Through the RRC reconfiguration message, one or more candidate cell information and corresponding cell handover condition information are configured for the UE. The UE modifies its own radio resource control (Radio Resource Control, RRC) configuration based on the RRC reconfiguration message.

Step 107, the UE sends an RRC connection reconfiguration complete message to the source base station Source gNB.

Step 108: Determine whether the target cell satisfies the cell handover condition information.

When the target cell satisfies the cell handover condition information, step 109 is performed.

Step 109, handover to the target cell.

That is, random access is initiated in the target cell.

Step 110: Send a conditional handover complete message to the target base station Target gNB.

By sending a conditional handover completion message to the target base station Target gNB and notifying the source base station Source gNB, the source base station Source gNB and the target base station Target gNB can know that the UE has completed the cell handover process.

It should be noted that, in a specific implementation, the target base station Target gNB may be only one, or may be multiple. When it is determined that the UE needs to perform cell condition handover, the source base station Source gNB needs to send a handover request to each target base station Target gNB. Each target base station Target gNB respectively judges whether it allows the UE to access, and when it can allow the UE to access, it sends an access permission notification to the source base station Source gNB. Correspondingly, in step 19, the UE chooses to autonomously select one of the target cells for handover.

According to the above solution, when the target cell includes both the macro cell and the AP cell, the UE may select the macro cell for access, or may select the AP cell for access, but does not necessarily select the AP cell for access. Since the AP base station is usually installed indoors and is closer to the UE, the performance of the UE accessing the AP cell is obviously more stable than that of the UE accessing the macro cell.

Accordingly, an embodiment of the present invention provides a cell handover method. When there is an AP cell in the candidate cell, the UE is preferentially handed over to the AP cell, and then the UE can be connected to the core network through the AP base station, so that the performance of the UE is more stable. .

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 2, an embodiment of the present invention provides a cell handover method, and the method may include the following steps:

Step 21: Receive the configuration information of the candidate cell and the cell handover condition information.

Wherein, the candidate cells at least include: AP cells; when the AP cells are intra-frequency AP cells, the candidate cells also include macro cells; when the candidate cells only include the AP cells, the The cell handover condition information includes: the first cell handover condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell handover condition information further includes: the second cell handover corresponding to the macro cell condition information.

Step 22, when the AP cell satisfies the corresponding cell handover condition, handover to the AP cell that satisfies the corresponding cell handover condition.

Steps 21 and 22 are described in detail below:

In specific implementation, the source base station may learn the candidate cells that can be configured for the UE based on the measurement report sent by the UE or the AP cell proximity indication message sent by the UE, or through information exchange with the target base station. The candidate cells include not only macro cells, but also AP cells. For any candidate cell, the UE can access. When the UE can be allowed to access the configured AP cell, the UE is called a subscriber of the AP cell, that is, the UE that the AP cell is allowed to access. The AP cell may also be called a small cell (small cell), or a non-public network cell (Non-public network cell, NPN cell).

The AP base station and the macro cell base station form a heterogeneous network. The transmit power of the AP base station may be lower than that of the existing macro cell base station, resulting in limited coverage. The AP base station and the macro cell base station can be deployed on the same frequency or different frequencies. When the primary carrier frequency of the AP cell is the same as the current working carrier frequency of the UE, the AP cell is called the same-frequency AP cell of the UE. When the primary carrier frequency of the AP cell is different from the current working carrier frequency of the UE, the AP cell is called the inter-frequency AP cell of the UE. The quality of a certain cell is jointly determined by the measurement result of the cell and the measurement offset configured by the network side.

In a specific implementation, the source base station may be based on reference signal received quality (Reference Signal Received Quality, RSRQ), Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio, SINR) and Reference Signal Received Power (Reference Singnal Received Power, RSRP) ), evaluate the relevant events on the signal quality, and configure the corresponding cell handover conditions for the UE.

When the AP cell satisfies the corresponding cell handover condition, regardless of whether the macro cell in the candidate cell satisfies the corresponding cell handover condition, the UE switches to the AP cell regardless of the macro cell. Among them, the AP cell that satisfies the cell handover condition may be the same-frequency AP cell, or may be the different-frequency AP cell. As long as there is an AP cell that satisfies the corresponding cell handover condition, the UE switches to the AP cell. If the same-frequency AP cell and the inter-frequency AP cell meet the corresponding cell handover conditions at the same time, the AP cell with the best quality among them can be selected for handover.

The cell handover condition information in the embodiment of the present invention not only includes the handover condition itself, but also includes information such as the measurement offset and the offset value that the handover condition needs to use. The condition for triggering the UE to perform cell handover may be an A3 event or an A5 event.

In a specific implementation, the A3 event is that the quality of the target cell is at least higher than the quality of the current cell SpCell by a preset offset value Off, that is:

Mn+Ofn+Ocn–Hys>Mp+Ofp+Ocp+Off (1)

Mn is the measurement result of the target cell, and Ofn and Ocn are the measurement offsets of the target cell configured by the source base station, respectively. Mp is the measurement result of the current cell Spcell, and Ofp and Ocp are the measurement offsets of the current cell Spcell. The current cell SpCell includes: a primary cell (Pcell) and a primary and secondary cell (PScell). Hys is a fixed value configured by the source base station. The measurement offsets Ofn and Ocn of the target cell, the measurement offsets Ofp and Ocp of the current cell Spcell, Hys, and the preset offset value Off, together with the handover condition itself, constitute the handover condition information.

In this embodiment of the present invention, for convenience of description, two A3 events with the same measurement offsets Ofp and Ocp of the current cell Spcell and the preset offset value Off are referred to as the same A3 event. Two A3 events with different arbitrary values among the measurement offsets Ofp and Ocp of the current cell Spcell and the preset offset value Off are called different A3 events.

The condition of the cell handover is the A3 event, which indicates that when the quality of the target cell satisfies the formula (1), the UE is triggered to handover to the target cell.

The A5 event is: the quality of the current cell SpCell is lower than the threshold Thresh1, and the quality of the target cell is higher than the threshold Thresh2, that is:

Mp+Hys<Thresh1 (2)

Mn+Ofn+Ocn–Hys>Thresh2 (3)

Ofn, Ocn, Hys, the threshold Thresh1 and the threshold Thresh2, and the switching condition itself, constitute switching condition information. The condition of the cell handover is the A5 event, which indicates that when the quality of the target cell satisfies the formula (2) and the formula (3), the UE is triggered to switch to the target cell.

In this embodiment of the present invention, for convenience of description, two A5 events with the same threshold Thresh1 and Thresh2 are referred to as the same A5 event. Two A5 events with different arbitrary values in the threshold Thresh1 and the threshold Thresh2 are called different A5 events.

In an embodiment of the present invention, the first cell handover condition information corresponding to the AP cell is the same as the second cell handover condition information corresponding to the macro cell, that is, the AP cell and the macro cell meet the same handover condition and use the same handover condition. Only when the relevant information of the handover condition is the same, the UE is allowed to perform handover. For example, when the cell handover conditions are all configured as the same A3 event, as shown in formula (1), for the measurement offsets Ofp and Ocp, Hys and the preset offset value Off of the current cell Spcell, both the AP cell and the macro cell are same.

At this time, no matter it is an AP cell of the same frequency or an AP cell of different frequency, the cell handover condition information may include: first priority handover cell indication information, which is used to indicate that the cell that satisfies the corresponding cell handover condition also includes the macro switch. cell and the AP cell, preferentially switch to the AP cell. Based on the indication of the first priority handover cell indication information, the UE may preferentially handover to the AP cell when the cells satisfying the cell handover condition include both the macro cell and the AP cell. When multiple AP cells meet the conditions, the AP cell with the best quality is selected for handover.

In another embodiment, when the cell handover condition information includes first cell handover condition information, and the number of the AP cells is two or more, the first cell handover condition information is the same as the AP cell. A correspondence. In this case, the first cell handover condition information corresponding to each AP cell may include: first priority handover cell indication information, which is used to indicate that the cell that satisfies the corresponding cell handover condition includes both the macro cell and the AP When it is in a cell, it will be handed over to the AP cell preferentially.

By adding the first priority handover cell indication information to the first cell handover condition information corresponding to each AP cell, when there is an AP cell that satisfies the cell handover condition, the AP cell that satisfies the cell handover condition can be preferentially handed over.

In a specific implementation, corresponding first cell handover condition information may also be set for the same-frequency AP cell and the inter-frequency AP cell, respectively. The following are respectively explained:

For the same-frequency AP cell, since the primary carrier frequency is the same as the current working carrier frequency of the UE, it will cause interference to the UE. Therefore, during cell handover, in order to avoid the same-frequency interference as much as possible, it is necessary to compare the macro cell in the alternative cell with The quality sets the cell handover condition, thereby making it easier for the UE to access the same-frequency AP cell in the candidate cell than the macro cell in the candidate cell.

In an embodiment of the present invention, the same-frequency AP cell and the macro cell can be configured to perform cell handover when different A3 events are satisfied. Specifically, the first cell handover condition information corresponding to the same-frequency AP cell may include: the quality of the target cell is better than the sum of the quality of the current cell and the first offset value. Correspondingly, the second cell handover condition information includes: the quality of the target cell is better than the sum of the quality of the current cell and the second offset value. Wherein, the first offset value is smaller than the second offset value.

That is, if the quality of the target intra-frequency AP cell is better than the sum of the current cell quality and the first offset value, the target intra-frequency AP cell satisfies the handover condition, and the UE can be handed over from the current cell to the target intra-frequency AP cell. If the quality of the target macro cell is better than the sum of the quality of the current cell and the second offset value, the target macro cell satisfies the handover condition, and the UE can be handed over from the current cell to the target macro cell. By setting the first offset value to be smaller than the second offset value, it is easier for the target intra-frequency AP cell to satisfy the handover condition, and it is easier for the UE to switch to the target intra-frequency AP cell.

For example, as shown in formula (1), the first offset value off1 can be configured to be smaller than the second offset value off2. At this time, when the measurement offsets Ofp and Ocp of the current cell Spcell are the same, the target intra-frequency AP It is easier for the cell to satisfy formula (1).

In another embodiment of the present invention, the same-frequency AP cell and the macro cell may be configured to perform cell handover when different A5 events are satisfied. Specifically, the first cell handover condition information corresponding to the same-frequency AP cell includes: the quality of the current cell is lower than the first preset quality threshold, and the quality of the target cell is greater than the second preset quality threshold. The second cell handover condition information includes: the quality of the current cell is lower than the third preset quality threshold, and the quality of the target cell is greater than the fourth preset quality threshold.

Wherein, the first preset quality threshold is greater than the third preset quality threshold, and the second preset quality threshold is less than the fourth preset quality threshold; or, the first preset quality threshold is greater than the the third preset quality threshold; or, the second preset quality threshold is smaller than the fourth preset quality threshold.

That is to say, if the quality of the current cell is lower than the first preset quality threshold and the quality of the target intra-frequency AP cell is greater than the second preset quality threshold, the target intra-frequency AP cell satisfies the handover condition, and the UE can be handed over from the current cell to the target co-frequency AP cell. If the current cell quality is lower than the third preset quality threshold, and the target macro cell quality is greater than the fourth preset quality threshold, the target macro cell satisfies the handover condition, and the UE can be handed over from the current cell to the target macro cell.

It can be seen from formula (2) that the larger the threshold Thresh1 is, the easier it is for the quality of the current cell to satisfy formula (2). Therefore, by setting the first preset quality threshold to be greater than the third preset quality threshold, the same target can be achieved. The easier the AP cell is to satisfy the A5 event.

Similarly, it can be seen from formula (3) that the smaller the threshold Thresh2 is, the easier it is for the quality of the target cell to satisfy formula (3). Therefore, by setting the second preset quality threshold to be greater than the fourth preset quality threshold, it is possible to This makes it easier for the target same-frequency AP cell to satisfy the A5 event.

It should be noted that, in specific implementation, only the first preset quality threshold may be set greater than the third preset quality threshold, and at this time, the second preset quality threshold may be equal to the fourth preset quality threshold . It is also possible to only set the second preset quality threshold to be smaller than the fourth preset quality threshold, and in this case, the first preset quality threshold may be equal to the third preset quality threshold. The second preset quality threshold may also be set to be smaller than the fourth preset quality threshold. It is also possible to simultaneously set the first preset quality threshold to be greater than the third preset quality threshold, and the second preset quality threshold to be less than the fourth preset quality threshold. At this time, the target intra-frequency AP cell is the easiest to satisfy A5 event.

In another embodiment of the present invention, the same-frequency AP cell can be configured to perform cell handover when the A3 event or A5 event is satisfied, and the macro cell can be configured to perform cell handover when the same A3 event and the same A5 event are satisfied. The difficulty of handing over the UE to the macro cell makes it easier for the UE to hand over to the target same-frequency AP cell.

Specifically, the first cell handover condition information corresponding to the same-frequency AP cell includes: the quality of the current cell is lower than the first preset quality threshold, and the quality of the target cell is greater than the second preset quality threshold; or, the quality of the target cell is better than The sum of the current cell quality and the first offset value. The second cell handover condition information includes: the current cell quality is lower than the first preset quality threshold, and the target cell quality is greater than the second preset quality threshold, and the target cell quality is better than the current cell quality and the first offset value. and.

That is to say, when the cell handover condition of the target intra-frequency AP cell is the A3 event, the macro cell needs to satisfy the A5 event in addition to the same A3 event. When the cell handover condition of the target same-frequency AP cell is the A5 event, the macro cell needs to meet the A3 event in addition to the same A5 event.

It can be understood that, in specific implementation, when the cell handover condition of the target same-frequency AP cell is the A3 event, the macro cell can also perform the cell handover condition only when the A5 event and another different A3 event are satisfied. When the cell handover condition of the target same-frequency AP cell is the A5 event, the macro cell may also perform the cell handover condition only when the A3 event and another different A5 event are satisfied. The specific setting is not limited, as long as it can make it easier for the UE to switch to the target same-frequency AP cell.

In yet another embodiment of the present invention, the measurement offset of the target cell in the first cell handover condition information may be configured to be greater than the measurement offset of the target cell in the second cell handover condition information.

In a specific implementation, the measurement offset of the target cell in the first cell handover condition information refers to Ofn and Ocn of the target intra-frequency AP cell configured by the source base station. The measurement offset of the target cell in the second cell handover condition information refers to Ofn and Ocn of the target macro cell configured by the source base station. By increasing the measurement offset of the target cell in the first cell handover condition information, it is easier for the target intra-frequency AP cell to satisfy formula (1) or (3). Therefore, whether the A3 event is used as the cell handover condition or the A5 event is used as the cell handover condition, the UE can more easily access the target same-frequency AP cell.

In specific implementation, in addition to setting the parameters of the relevant events in the cell handover condition information to make it easier for the UE to switch to the AP co-frequency cell, the duration for which the target cell satisfies the corresponding cell handover condition can also be set at the same time.

Specifically, the first cell handover condition information may further include: duration information that the same-frequency AP cell satisfies the corresponding cell handover condition; the second cell handover condition information may further include: the macro cell satisfies the corresponding cell handover condition. Information on the duration of the cell handover condition. Wherein, the duration that the same-frequency AP cell satisfies the handover condition of the corresponding cell is less than the duration that the macro cell satisfies the handover condition of the corresponding cell.

For example, when the cell handover condition satisfied by the same-frequency AP cell in the first cell handover condition information is the A3 event, the duration of the intra-frequency AP cell satisfying the A3 event may be configured to be t1. In the second cell handover condition information, the cell handover condition satisfied by the macro cell is also the A3 event, but the duration of the configuration for the macro cell to satisfy the A3 event is t2, and t1<t2. By shortening the duration required for the same-frequency AP cell to satisfy the handover condition, the UE can be handed over to the same-frequency AP cell more quickly.

In an embodiment, t1 can be set to be 0. In this case, once the AP cell of the same frequency satisfies the A3 event, it is switched to the AP cell of the same frequency.

In an embodiment, the candidate cells may only include inter-frequency AP cells, but not macro cells. Alternatively, the candidate cell may include an inter-frequency AP cell and a macro cell at the same time.

For inter-frequency AP cells, since there is no co-frequency interference, it is sufficient to decide whether to handover based on the quality of the target cell itself, without considering the quality of the macro cell and the quality of the current cell.

In an embodiment of the present invention, the first cell handover condition information corresponding to the inter-frequency AP cell includes: switching to the inter-frequency AP cell when the quality of the target cell is better than a preset quality threshold. At this time, regardless of the quality of the macro cell, as long as the inter-frequency AP cell satisfies the above conditions, handover can be performed. The preset quality threshold may be set according to actual conditions.

In another embodiment of the present invention, the first cell handover condition information corresponding to the inter-frequency AP cell may include: when the target cell is the cell with the best quality among the cells corresponding to the frequency point where it is located, switching to the inter-frequency AP cell frequency AP cell.

When the target inter-frequency AP cell is the cell with the best quality among the cells corresponding to the frequency point, the quality of the cell is good enough and the network reliability is higher, so no matter what the quality of the macro cell is, as long as the inter-frequency AP cell satisfies the above conditions to switch.

In yet another embodiment of the present invention, the first cell handover condition information corresponding to the inter-frequency AP cell may include: after the quality of the target cell is increased by a third offset value, the cell with the highest quality in the cell corresponding to the frequency point. When a good cell is available, switch to the inter-frequency AP cell. Wherein, the third offset value may be set according to the actual situation.

That is, the quality of the target inter-frequency AP cell is the cell with the best quality among the cells corresponding to the frequency point after the third offset value is added. At this time, the network reliability is high, and the UE can be controlled to perform cell handover.

In a specific implementation, the cell handover condition information may include both the first cell handover condition information and the second cell handover condition information.

In order to save transmission resources, the cell handover condition information may include only the first cell handover condition information, but not the second cell handover condition information, or only the second cell handover condition information, but not the first cell handover condition information.

In an embodiment of the present invention, when the cell handover condition information only includes the first cell handover condition information or the second cell handover condition information, before performing cell handover, the cell handover may be based on the cell handover Condition information, to determine the handover condition information of another cell except the cell corresponding to the cell handover condition information.

Specifically, when the cell handover condition information only includes the first cell handover condition information, before the cell handover is performed, the second cell handover condition information may be determined based on the first cell handover condition information. When the cell handover condition information only includes the second cell handover condition information, before the cell handover is performed, the first cell handover condition information may be determined based on the second cell handover condition information.

Specifically, how to determine the handover condition information of another cell other than the cell corresponding to the cell handover condition information according to the cell handover condition information can be implemented through an agreement or a pre-agreed manner.

When both the macro cell and the AP cell trigger the cell handover when the A3 event is satisfied, the relationship between the first offset value in the first cell handover condition information and the second offset value in the second cell handover condition information can be pre-agreed, Based on the relationship between the two offset values, another cell handover condition information is determined.

For example, when the cell handover condition information only includes the second cell handover condition information, it is pre-agreed that the result of the difference between the second offset value in the second cell handover condition information and the fixed value a is the first cell handover The first offset value in the condition information.

When both the macro cell and the AP cell trigger the cell handover when the A5 event is satisfied, the first preset quality threshold in the handover condition information of the first cell and the third preset quality threshold in the handover condition information of the second cell can be pre-agreed between and the relationship between the second preset quality threshold in the handover condition information of the first cell and the fourth preset quality threshold in the handover condition information of the second cell, based on the difference between the thresholds in the handover condition information of the two cells relationship, and determine the handover condition information of another cell.

For example, when the cell handover condition information only includes the first cell handover condition information, it is pre-agreed that the difference between the first preset quality threshold and the fixed value b in the first cell handover condition information is the second cell. The third preset quality threshold in the handover condition information. At the same time, it can be agreed that the difference between the second preset quality threshold in the first cell handover condition information and the fixed value b is the fourth preset quality threshold in the first cell handover condition information.

In a specific implementation, when the number of AP cells satisfying the corresponding cell handover condition is two or more, the UE may select the target AP cell with the best quality for handover according to the quality of each target AP cell.

In a specific implementation, the handover is performed in the target cell, that is, the source base station is notified to release the RRC connection of the UE, and the UE initiates random access in the target cell to establish an RRC connection with the target base station.

In a specific implementation, the UE can find the same-frequency cell that currently causes the same-frequency interference to itself. If the same-frequency cell allows the UE to access, the UE can use the cell handover method in the above embodiment to access the same-frequency cell. , to avoid co-channel interference.

When the intra-frequency cell does not allow the UE to access, the UE is a non-subscribed user relative to the intra-frequency cell at this time. In order to avoid co-channel interference, it is necessary to perform interference coordination or handover between the AP base station and the macrocell base station. The current common practice is to adjust the transmit power of the AP base station through interference coordination between base stations, or perform inter-frequency handover or redirection of the UE to avoid co-frequency interference and call drop due to interference.

Different from the prior art, in the embodiment of the present invention, after the UE discovers the co-frequency cells that currently cause co-frequency interference to itself, the UE may report the co-frequency cells that cause interference to itself to the source base station.

In an embodiment of the present invention, the source base station may configure one or more inter-frequency cells as candidate cells to the UE, and when configuring the corresponding handover condition, RSRQ or SINR may be used as the measurement quantity in the handover condition, and configured to UE. That is, when the RSRQ or SINR of the inter-frequency cell reaches a preset value, the UE switches from the current cell to the corresponding inter-frequency cell.

In another embodiment of the present invention, an I1 event may be introduced as a switching condition for evaluation, where the I1 event refers to the interference greater than a certain threshold, as shown in formula (4):

Mi–Hys>Thresh (4)

Wherein, Mi is the interference measurement result of the macro cell, here is the interference measurement result of the macro cell, if the event is satisfied, the best inter-frequency candidate cell that satisfies the condition is selected for handover.

In another embodiment of the present invention, the switching conditions for inter-frequency cells can be configured as follows: the interfering AP cell satisfies at least one of the A3 event, the A5 event, exceeds a certain threshold, and is greater than the signal quality of the macro cell, and selects the one that satisfies the above conditions. It is best to perform handover between alternate frequency cells.

It can be seen from the above content that the cell handover method in the embodiment of the present invention, by setting the cell handover conditions, can make the UE preferentially select the AP cell for handover when certain conditions are met, which effectively improves the performance stability of the UE.

In order for those skilled in the art to better understand and implement the present invention, the user equipment and the computer-readable storage medium corresponding to the above method are described in detail below.

Referring to FIG. 3 , an embodiment of the present invention provides a user equipment 30 , where the user equipment 30 may include: a receiving unit 31 and a cell switching unit 32 . in:

The receiving unit 31 is adapted to receive the configuration information of the candidate cell and the cell handover condition information; the candidate cell at least includes: an AP cell; when the AP cell is an AP cell of the same frequency, the candidate cell also including a macro cell; when the candidate cell includes only an AP cell, the cell handover condition information includes: first cell handover condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell handover condition information includes: The cell handover condition information further includes: second cell handover condition information corresponding to the macro cell;

The cell handover unit 32 is adapted to switch to an AP cell that satisfies the corresponding cell handover condition when the AP cell satisfies the corresponding cell handover condition.

The receiving unit 31 and the cell switching unit 32 can be implemented with reference to the above description of steps 21 and 22, and details are not repeated here.

The embodiment of the present invention also provides another computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the steps of any cell handover method in the above-mentioned embodiments, which will not be described again. .

In a specific implementation, the computer-readable storage medium may include: ROM, RAM, magnetic disk or optical disk, and the like.

An embodiment of the present invention further provides a user equipment, the user equipment includes a memory and a processor, the memory stores a computer program that can run on the processor, and when the processor runs the computer program Perform the steps of any of the methods described above.

The technical solution of the present invention can be applied to 5G (5Generation) communication systems, 4G and 3G communication systems, and various new communication systems in the future, such as 6G and 7G.

A base station (Base Station, BS for short) in the embodiments of the present application, which may also be referred to as base station equipment, is a device deployed in a radio access network (RAN) to provide a wireless communication function. For example, the equipment that provides base station functions in 2G networks includes Base Transceiver Station (BTS), the equipment that provides base station functions in 3G networks includes Node B (NodeB), and the equipment that provides base station functions in 4G networks includes Evolution Node B (evolved NodeB, eNB), in wireless local area networks (wireless local area networks, WLAN), the device that provides the base station function is the AP, the device gNB that provides the base station function in 5G NR, and the node B that continues to evolve (ng-eNB). The NR technology is used for communication between the gNB and the terminal, and the E-UTRA (Evolved Universal Terrestrial Radio Access) technology is used for the communication between the ng-eNB and the terminal. Both the gNB and the ng-eNB can be connected to the 5G core network. The base station in this embodiment of the present application also includes equipment and the like that provide base station functions in a new communication system in the future.

The user equipment in the embodiments of the present application includes various forms, and may be an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station (mobile station, built as an MS), a remote station, a remote terminal, a mobile device, and a user terminal , terminal equipment, wireless communication equipment, user agent or user equipment. It can also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), or a Wireless communication-enabled handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or future evolved Public Land Mobile Networks (PLMN for short) ), which is not limited in this embodiment of the present application.

Regarding each module/unit included in each device and product described in the above-mentioned embodiments, it may be a software module/unit, a hardware module/unit, or a part of a software module/unit and a part of a hardware module/unit . For example, for each device or product applied to or integrated in a chip, each module/unit included therein may be implemented by hardware such as circuits, or at least some of the modules/units may be implemented by a software program. Running on the processor integrated inside the chip, the remaining (if any) part of the modules/units can be implemented by hardware such as circuits; for each device and product applied to or integrated in the chip module, the modules/units contained therein can be They are all implemented by hardware such as circuits, and different modules/units can be located in the same component of the chip module (such as chips, circuit modules, etc.) or in different components, or at least some of the modules/units can be implemented by software programs. The software program runs on the processor integrated inside the chip module, and the remaining (if any) part of the modules/units can be implemented by hardware such as circuits; for each device and product applied to or integrated in the terminal, each module contained in it The units/units may all be implemented in hardware such as circuits, and different modules/units may be located in the same component (eg, chip, circuit module, etc.) or in different components in the terminal, or at least some of the modules/units may be implemented by software programs Realization, the software program runs on the processor integrated inside the terminal, and the remaining (if any) part of the modules/units can be implemented in hardware such as circuits.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (15)

A cell handover method, comprising: Receive configuration information and cell handover condition information of the candidate cell; the candidate cell at least includes: an AP cell; when the AP cell is an intra-frequency AP cell, the candidate cell also includes a macro cell; When the selected cell includes only the AP cell, the cell handover condition information includes: first cell handover condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell handover condition information further includes : handover condition information of the second cell corresponding to the macro cell; When the AP cell satisfies the corresponding cell handover condition, handover to the AP cell that satisfies the corresponding cell handover condition. The cell handover method according to claim 1, wherein the cell handover condition information comprises: first priority handover cell indication information, which is used to indicate that the cell that satisfies the corresponding cell handover condition includes both the macro cell and all the cell handover conditions. When the AP cell is selected, it is preferentially handed over to the AP cell. The cell handover method according to claim 1, wherein when the cell handover condition information includes first cell handover condition information, and the number of the AP cells is two or more, the first cell handover The condition information is in one-to-one correspondence with the AP cell; The first cell handover condition information corresponding to each AP cell includes: first priority handover cell indication information, which is used to indicate that when the cell that satisfies the corresponding cell handover condition includes both the macro cell and the AP cell, priority Handover to the AP cell. The cell handover method according to claim 1, wherein, The first cell handover condition information corresponding to the same-frequency AP cell includes: the quality of the target cell is better than the sum of the quality of the current cell and the first offset value; The second cell handover condition information includes: the quality of the target cell is better than the sum of the quality of the current cell and the second offset value; The first offset value is smaller than the second offset value. The cell handover method according to claim 1, wherein, The first cell handover condition information corresponding to the same-frequency AP cell includes: the current cell quality is lower than the first preset quality threshold, and the target cell quality is greater than the second preset quality threshold; The second cell handover condition information includes: the current cell quality is lower than the third preset quality threshold, and the target cell quality is greater than the fourth preset quality threshold; Wherein, the first preset quality threshold is greater than the third preset quality threshold, and the second preset quality threshold is less than the fourth preset quality threshold; or, the first preset quality threshold is greater than the The third preset quality threshold; or, the second preset quality threshold is smaller than the fourth preset quality threshold. The cell handover method according to claim 1, wherein, The first cell handover condition information corresponding to the same-frequency AP cell includes: the quality of the current cell is lower than the first preset quality threshold, and the quality of the target cell is greater than the second preset quality threshold; or, the quality of the target cell is better than the quality of the current cell the sum of the first offset value; The second cell handover condition information includes: the current cell quality is lower than the first preset quality threshold, and the target cell quality is greater than the second preset quality threshold, and the target cell quality is better than the current cell quality and the first offset value. and. The cell handover method according to claim 1, wherein the measurement offset of the target cell in the first cell handover condition information is greater than the measurement offset of the target cell in the second cell handover condition information. The cell handover method according to any one of claims 4 to 7, wherein, The first cell handover condition information further includes: duration information that the same-frequency AP cell satisfies the corresponding cell handover condition; The second cell handover condition information further includes: duration information that the macro cell satisfies the corresponding cell handover condition; Wherein, the duration that the same-frequency AP cell satisfies the handover condition of the corresponding cell is less than the duration that the macro cell satisfies the handover condition of the corresponding cell. The cell handover method according to claim 1, wherein the AP cell is an inter-frequency AP cell. The cell handover method according to claim 9, wherein the first cell handover condition information corresponding to the inter-frequency AP cell comprises: when the quality of the target cell is better than a preset quality threshold, switching to the inter-frequency AP community. The cell handover method according to claim 9, wherein the first cell handover condition information corresponding to the inter-frequency AP cell includes: when the target cell is the cell with the best quality among the cells corresponding to the frequency point, the handover to the inter-frequency AP cell. The cell handover method according to claim 4, wherein the first cell handover condition information corresponding to the inter-frequency AP cell comprises: after the quality of the target cell is increased by a third offset value, the first cell handover condition information corresponding to the frequency point of the target cell When the cell with the best quality among the cells, switch to the inter-frequency AP cell. The cell handover method according to claim 1, wherein when the cell handover condition information only includes the first cell handover condition information or the second cell handover condition information, before the cell handover is performed, the The method also includes: Based on the cell handover condition information, determine handover condition information of another cell except the cell corresponding to the cell handover condition information. 14. A user equipment, comprising: a receiving unit, adapted to receive configuration information and cell handover condition information of the candidate cell; the candidate cell at least includes: an AP cell; when the AP cell is an AP cell of the same frequency, the candidate cell also includes a macro cell ; When the candidate cell only includes the AP cell, the cell handover condition information includes: first cell handover condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell The handover condition information further includes: second cell handover condition information corresponding to the macro cell; The cell handover unit is adapted to switch to the AP cell that satisfies the corresponding cell handover condition when the AP cell satisfies the corresponding cell handover condition. A computer-readable storage medium on which a computer program is stored, characterized in that, the computer program is executed by a processor to implement the steps of the method according to any one of claims 1 to 13. A user equipment, comprising a memory and a processor, the memory stores a computer program that can run on the processor, wherein the processor executes any of claims 1 to 13 when running the computer program. A step of the method.

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