CN107295468A - The cell switching method and device of a kind of long evolving system - Google Patents

Abstract

The present invention provides a cell handover method and device for a long-term evolution system. The method includes: receiving signal quality detection information sent by user equipment; when determining the location of user equipment according to the signal quality detection information, the signal quality of the serving cell is less than When the first threshold value is set, and the signal quality of the same-frequency neighboring cell of the serving cell does not meet the preset condition, determine the first position of the user equipment relative to the serving cell; determine the first position for selecting the first measurement object according to the first position Area range: Select a cell located in the first area range as the first measurement object from the neighboring cells of different frequencies and different systems of the serving cell, and send it to the user equipment; when the user equipment selects the target cell from the first measurement object , to control the user equipment to switch to the target cell. According to the solution of the present invention, the measurement objects are screened according to the relative positions of the user equipment and the serving cell, which greatly shortens the cell switching time of the user equipment and improves user experience.

Description

A cell handover method and device for a long term evolution system

technical field

The present invention relates to the field of wireless communication systems, in particular to a cell handover method and device for a long term evolution system.

Background technique

In the third-generation mobile communication Long Term Evolution (LTE) system, handover is one of the important technologies of LTE, which can enable a user equipment (UE) in a mobile state to smoothly enter another cell from one cell.

In the prior art, the basic process of UE performing cell handover is shown in FIG. 1 . In FIG. 1 , cell A is the serving cell of the UE, cell B is the neighbor cell of cell A, and the UE moves from cell A to cell B, and cell B is called the target cell of the UE. The process of UE handover from cell A to cell B is as follows:

Step 1: UE periodically measures the signal quality of cell A. If it is found that the signal quality of cell A is lower than a certain threshold, this event is reported to cell A.

Step 2: Cell A instructs the UE to measure whether the signal quality of surrounding co-frequency neighbor cells meets the conditions. If there is an intra-frequency adjacent cell that satisfies the conditions, the intra-frequency adjacent cell is the handover target cell, and the UE reports this event to cell A, and goes to step 4. If no co-frequency neighboring cell meets the condition, cell A orders the UE to perform inter-frequency and inter-system measurement.

Step 3: UE finds that the signal quality of cell B satisfies the condition through measurement, then cell B is the handover target cell, and UE reports this event to cell A.

Step 4: Cell A commands the UE to switch to the target cell.

Among them, the disadvantage of the above process lies in the measurement of the second step. If the UE cannot select a target cell with the same frequency, it needs to start inter-frequency and inter-system measurement. Since cell A does not know where the UE is, cell A will order the UE to measure the frequencies of all neighboring inter-frequency and inter-system cells. , then there are many measurement objects. In dense urban areas, cell A will have more inter-frequency and inter-system neighboring cells. Wherein, when there are too many measurement objects, the UE will spend more time for measurement, thereby affecting the normal service of the UE, causing the UE to consume more power, affecting user experience, and even causing call drop. For example, as shown in Figure 1, assuming that cells A to F belong to different frequency points, although the target cell of the UE is cell B, since cell A does not know this information, cell A will order the UE to measure cells B to F. All frequency points to which cell F belongs.

Contents of the invention

In order to overcome the above-mentioned problems existing in the prior art, embodiments of the present invention provide a cell handover method and device for a long-term evolution system, which can switch between different frequencies and different systems of the serving cell according to the relative position of the user equipment and the serving cell. The measurement object can be screened in the area, thereby shortening the measurement time of the user equipment, reducing the adverse impact on normal business, and improving the user experience.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

According to an aspect of an embodiment of the present invention, a cell handover method of a long term evolution system is provided, which is applied to a serving cell, and the cell handover method includes:

Receive signal quality detection information sent by the user equipment;

When it is determined according to the signal quality detection information that at the location of the user equipment, the signal quality of the serving cell is less than a first threshold value, and the signal quality of the same-frequency neighboring cells of the serving cell does not meet a preset condition, determining a first location of the user equipment relative to the serving cell;

According to the first position, determine a first area range for selecting a first measurement object;

Selecting a cell located in the first area range as the first measurement object from neighboring cells of the serving cell with different frequencies and different systems, and sending it to the user equipment;

When the user equipment selects a target cell whose signal quality satisfies the preset condition from the first measurement object, control the user equipment to handover to the target cell.

Wherein, in the above-mentioned solution, the determining the first area range for selecting the first measurement object according to the first position includes:

determining a pointing direction of the user equipment relative to a base station of the serving cell according to the first position;

Determining the range of the second area obtained by scanning the pointing direction towards the first rotation direction at a first preset angle;

determining that the pointing direction rotates the first preset angle to scan a third area range toward the second rotation direction;

In a circumferential direction centered on the base station of the serving cell, a range other than the second area range and the third area range is determined as the first area range.

Wherein, in the above-mentioned solution, the determining the first area range for selecting the first measurement object according to the first position includes:

determining an angle of arrival AoA at which the user equipment arrives at the base station of the serving cell according to the first position;

determining a second preset angle X that determines the boundary of the first area;

According to the angle of arrival AoA and the second preset angle X, and the first formula Y1=(AoA+X)mod360°, determine the angle value Y1 of the first boundary of the first area range;

According to the angle of arrival AoA and the second preset angle X, and the second formula Y2=(AoA-X+360°)mod360°, determine the angle value Y2 of the second boundary of the first area range;

In the circumferential direction centered on the base station of the serving cell, the angle value is located between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, which is determined as the first area range .

Wherein, in the above solution, the cell located in the first area range is selected from the neighboring cells of different frequencies and different systems of the serving cell as the first measurement object, specifically:

From the adjacent cells of different frequency and different systems of the serving cell, select a cell whose orientation angle is between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, as the first measurement object .

Wherein, in the above solution, after the step of selecting a cell located in the first area range as the first measurement object from the neighboring cells of different frequencies and different systems of the serving cell, and sending it to the user equipment, The method also includes:

When the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object, according to the preset cycle, when the first cycle arrives, determine that the user equipment is relatively the second location of the serving cell;

According to the second position, determine a second area range for selecting a second measurement object;

Selecting a cell located in the second area as the second measurement object from neighboring cells of the serving cell with different frequencies and different systems, and sending it to the user equipment;

When the user equipment does not select a target cell whose signal quality satisfies the preset condition from the second measurement object, according to the preset period, when the second period arrives, determine that the user equipment is relatively the third location of the serving cell until the target cell is found.

According to another aspect of the embodiments of the present invention, there is also provided a cell handover device for a long term evolution system, which is applied to a serving cell, and the cell handover device includes:

A receiving module, configured to receive signal quality detection information sent by the user equipment;

The first determining module is configured to determine, according to the signal quality detection information received by the receiving module, that at the location of the user equipment, the signal quality of the serving cell is less than a first threshold, and the same of the serving cell determining a first position of the user equipment relative to the serving cell when the signal quality of the frequency neighbor cell does not meet the preset condition;

A second determination module, configured to determine a first area range for selecting a first measurement object according to the first position determined by the first determination module;

A first selection module, configured to select a cell located in the first area range determined by the second determination module from neighboring cells of different frequencies and different systems of the serving cell as the first measurement object, and sent to the user equipment;

A control module, configured to control the user equipment to switch to the target cell when the user equipment selects a target cell whose signal quality meets the preset condition from the first measurement object.

Wherein, in the above solution, the second determination module includes:

a first determining unit, configured to determine a pointing direction of the user equipment relative to a base station of the serving cell according to the first position;

The second determination unit is configured to determine a second area range obtained by scanning the pointing direction towards the first rotation direction at a first preset angle;

A third determination unit, configured to determine a third area range scanned by the first preset angle when the pointing direction is rotated toward the second rotation direction;

The fourth determining unit is configured to determine, in a circumferential direction centered on the base station of the serving cell, a range other than the second area range and the third area range as the first area range.

Wherein, in the above solution, the second determination module includes:

A fifth determining unit, configured to determine an angle of arrival AoA at which the user equipment arrives at the base station of the serving cell according to the first position;

A sixth determining unit, configured to determine a second preset angle X that determines the boundary of the first region;

A seventh determination unit, configured to determine the angle of the first boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and the first formula Y1=(AoA+X)mod360° value Y1;

The eighth determination unit is configured to determine the second angle of the first area range according to the angle of arrival AoA and the second preset angle X, and the second formula Y2=(AoA-X+360°)mod360° The angular value of the boundary Y2;

The ninth determination unit is configured to set the angle value in the area range between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in the circumferential direction centered on the base station of the serving cell, determined as the first area range.

Wherein, in the above solution, the first selection module is specifically used for:

From the adjacent cells of different frequency and different systems of the serving cell, select a cell whose orientation angle is between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, as the first measurement object .

Wherein, in the above solution, the cell handover device further includes:

A third determining module, configured to determine, according to a preset period when the first period arrives, when the user equipment does not select a target cell whose signal quality meets the preset condition from the first measurement object a second location of the user equipment relative to the serving cell;

A fourth determination module, configured to determine a second area range for selecting a second measurement object according to the second position determined by the second determination module;

The second selection module is configured to select, from neighboring cells of different frequencies and different systems of the serving cell, a cell located in the second area range determined by the third determination module as the second measurement object, and sent to the user equipment;

The fifth determining module is configured to: when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the second measurement object, according to the preset cycle, when the second cycle arrives , determining a third position of the user equipment relative to the serving cell until the target cell is found.

The beneficial effects of the embodiments of the present invention are:

In the cell handover method of the long-term evolution system of the embodiment of the present invention, at the location of the user equipment, when the signal quality of the serving cell is less than the first threshold value, and the signal quality of the same-frequency neighbor cell of the serving cell does not meet the preset condition, by determining the relative position of the user equipment and the serving cell, the measurement object is screened from the neighboring cells of different frequency and different systems of the serving cell, and the selected measurement object is sent to the user equipment, so that the user equipment can select from the measurement object Selecting a target cell whose signal quality satisfies the preset condition, so that the user equipment is handed over to the target cell. It can be seen that the cell handover method of the long-term evolution system in the embodiment of the present invention greatly reduces the measurement objects of the user equipment after being screened when performing inter-frequency and inter-system measurement, thereby reducing measurement time and alleviating adverse effects on services influence and improve the user experience.

Description of drawings

FIG. 1 shows a schematic diagram of selecting a measurement object when a UE performs cell handover in the prior art;

Fig. 2 shows the flowchart of the cell handover method of the long-term evolution system of the first embodiment of the present invention;

FIG. 3 shows one of the structural block diagrams of the cell handover device of the long-term evolution system according to the second embodiment of the present invention;

FIG. 4 shows the second structural block diagram of the cell switching device of the long-term evolution system according to the second embodiment of the present invention;

Fig. 5 shows a schematic diagram of the area range of the measurement object obtained by rotating a preset angle in the first embodiment of the present invention;

Figure 6 shows a schematic diagram of the angle of arrival in the first embodiment of the present invention;

Fig. 7 shows one of the schematic diagrams of the area range of the selected measurement object in the first embodiment of the present invention;

Fig. 8 shows the second schematic diagram of the area range of the selected measurement object in the first embodiment of the present invention;

Fig. 9 shows the third schematic diagram of the area range of the selected measurement object in the first embodiment of the present invention.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

first embodiment

According to an aspect of an embodiment of the present invention, a cell handover method of a long term evolution system is provided, which is applied to a serving cell, as shown in FIG. 2 , the method includes:

Step 201: Receive signal quality detection information sent by a user equipment.

During use, the user equipment will periodically test the signal quality of the serving cell. If it is found that the signal quality of the serving cell is lower than a certain threshold, such as the first threshold, this event is reported to the serving cell. At this time, the serving cell will instruct the user equipment to measure whether the signal quality of surrounding co-frequency neighbor cells satisfies the preset condition. That is, a cell whose signal quality satisfies a preset condition is searched for as a target cell from the same-frequency neighboring cells of the serving cell. If there is an intra-frequency adjacent cell that satisfies the preset condition, the intra-frequency adjacent cell is the target cell, and the user equipment reports this event to the serving cell. If there is no cell that meets the preset conditions in the same-frequency adjacent cell, the user equipment will also report the serving cell, that is, notify the serving cell by sending signal quality detection information to the serving cell. The target cell whose signal quality meets the preset condition is searched in the area.

Wherein, the preset condition is that the signal quality of the target cell reaches the second threshold, or the signal quality of the target cell is higher than the signal quality of the serving cell by a preset value.

Step 202: When it is determined according to the signal quality detection information that the user equipment is located, the signal quality of the serving cell is less than a first threshold, and the signal quality of the same-frequency neighboring cells of the serving cell does not meet the preset When the condition is met, determine the first position of the user equipment relative to the serving cell.

The signal quality detection information sent by the user equipment to the serving cell carries the information that the signal quality of the serving cell is less than the first threshold value at the current location of the user equipment, and the signals of the same-frequency neighboring cells of the serving cell Information whose quality does not meet the preset conditions. Wherein, if the signal quality of the serving cell is less than the first threshold value, it indicates that the user equipment needs to perform cell handover.

When the serving cell obtains the above information from the received signal quality detection information, the serving cell needs to determine the relative position of the user equipment and itself.

Step 203 , according to the first position, determine a first area range for selecting a first measurement object.

During cell handover, when there is no cell whose signal quality meets the preset conditions in the same-frequency adjacent cells of the serving cell, it is necessary to select the measurement object for the user equipment to measure the signal quality from among the different-frequency and different-system adjacent cells of the serving cell . In the embodiment of the present invention, in order to reduce the measurement objects and thereby reduce the measurement time of the user equipment, an area range is divided according to the relative position of the user equipment and the serving cell as a condition for screening measurement objects.

Wherein, according to the first position of the user equipment relative to the serving cell, the following two specific manners may be adopted for determining the first area range for selecting the first measurement object.

Mode 1: Specifically, step 203 includes:

determining a pointing direction of the user equipment relative to a base station of the serving cell according to the first position;

Determining the range of the second area obtained by scanning the pointing direction towards the first rotation direction at a first preset angle;

determining that the pointing direction rotates the first preset angle to scan a third area range toward the second rotation direction;

In a circumferential direction centered on the base station of the serving cell, a range other than the second area range and the third area range is determined as the first area range.

Wherein, the first preset angle may be 60°, 90°, 120°, or other angle values. Wherein, the larger the first preset angle is, the less the first measurement object is included in the first area range, and the possibility of missing the real target cell of the user equipment is also greater. Conversely, the smaller the first preset angle is, the more the first measurement object is included in the first region, and the utility of the algorithm will be reduced.

For example, when the first preset angle is 90°, as shown in Figure 5, the serving cell is cell A, then the user equipment rotates 90° clockwise with respect to the direction of cell A, and sweeps across the second area , rotate counterclockwise and sweep the third area, then in the circumferential direction centered on the base station of cell A, the area other than the second area and the third area is the first area, that is, in Figure 5 The alpha range shown is the first zone range.

Way 2: Specifically, step 203 includes:

determining an angle of arrival AoA at which the user equipment arrives at the base station of the serving cell according to the first position;

determining a second preset angle X that determines the boundary of the first area;

According to the angle of arrival AoA and the second preset angle X, and the first formula Y1=(AoA+X)mod360°, determine the angle value Y1 of the first boundary of the first area range;

According to the angle of arrival AoA and the second preset angle X, and the second formula Y2=(AoA-X+360°)mod360°, determine the angle value Y2 of the second boundary of the first area range;

In the circumferential direction centered on the base station of the serving cell, the angle value is located between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, which is determined as the first area range .

Wherein, the angle of arrival AoA at which the user equipment arrives at the base station of the serving cell is the angle at which the signal of the user equipment measured by the serving cell arrives at the base station of the cell. As shown in FIG. 6 , cell A is the serving cell, with the base station of cell A as the center, the north direction line rotates clockwise to the signal position of the user equipment, and the angle of rotation is AoA.

In addition, the second preset angle may also be 60°, 90°, 120°, or other angle values. Wherein, the larger the second preset angle is, the less the first measurement object is included in the first area range, and the possibility of missing the real target cell of the user equipment is also greater. On the contrary, the smaller the second preset angle is, the more the first measurement object is included in the first area range, and the utility of the algorithm will be reduced.

Wherein, assuming that the range of the first region is represented by α, then (AoA+X) mod 360°≦α≦(AoA−X+360°) mod 360°. For example, when X=90°, as shown in Figure 7, (AoA+90°)mod360°≤α≤(AoA-90°+360°)mod360°, and if AoA=60°, it can pass Calculated to obtain 150°≤α≤330°. When X=60°, as shown in FIG. 8 , (AoA+60°)mod360°≤α≤(AoA-60°+360°)mod360°. When X=120°, as shown in FIG. 9 , (AoA+120°)mod360°≤α≤(AoA-120°+360°)mod360°. Wherein, the direction of N shown in FIGS. 7 to 9 represents the true north direction.

By determining the first area range in the second manner above, the area covered by the first area range can be intuitively obtained from the perspective of the angle value, so as to facilitate searching for measurement objects from this area.

Step 204: Select a cell located in the first area as the first measurement object from neighboring cells of the serving cell with different frequencies and different systems, and send it to the user equipment.

After the first area range of the first measurement object is determined, the serving cell will select a neighboring cell of different frequency and different system from the first area range as the first measurement object, and send the selected first measurement object to the user equipment, The user equipment is made to measure the signal quality of the first measurement object, so as to select a target cell whose signal quality satisfies a preset condition from the first measurement object.

In addition, if step 203 adopts the above-mentioned method 2 to determine the first area range, then step 204 is specifically:

From the adjacent cells of different frequency and different systems of the serving cell, select a cell whose orientation angle is between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, as the first measurement object .

Wherein, the azimuth angle of a neighboring cell of a different frequency and different system is the base station of the serving cell as the center, and refers to the angle through which the north direction line rotates clockwise to the position of the neighboring cell of the different frequency and different system. Therefore, when step 204 adopts the above-mentioned method 2 to determine the first area range, the adjacent cell with different frequency and different system whose azimuth angle is within the value interval of [Y1, Y2] can be selected as the first measurement object.

Step 205: When the user equipment selects a target cell whose signal quality satisfies the preset condition from the first measurement object, control the user equipment to handover to the target cell.

When the user equipment finds that the signal quality of one or some neighboring cells meets the preset conditions through measurement, the user equipment will report this event to the serving cell, and the serving cell will order the user equipment to switch to the target cell. Wherein, if the user equipment selects a plurality of cells whose signal quality meets the preset condition from the first measurement object, in general, it will determine a cell from the cells whose signal quality meets the preset condition according to the relevant regulations of the manufacturer. as the target area.

When the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object, after step 205, it may further include:

When the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object, according to the preset cycle, when the first cycle arrives, determine that the user equipment is relatively the second location of the serving cell;

According to the second position, determine a second area range for selecting a second measurement object;

Selecting a cell located in the second area as the second measurement object from neighboring cells of the serving cell with different frequencies and different systems, and sending it to the user equipment;

When the user equipment does not select a target cell whose signal quality satisfies the preset condition from the second measurement object, according to the preset period, when the second period arrives, determine that the user equipment is relatively at the third position of the serving cell until the target cell is found.

That is, when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object, the serving cell may periodically determine the relative position of the user equipment in the subsequent time, and based on the determined relative position , to obtain the range of the selected measurement object, and then select the measurement object from the range and send it to the user equipment. If the user equipment does not select a target cell from the measurement objects within the period, the above process is repeated in the next period until the target cell is found.

In addition, in another embodiment of the present invention, when performing cell handover, if there is no cell whose signal quality satisfies the preset condition in the same-frequency neighboring cell, the serving cell may periodically acquire the user equipment and The relative position of the serving cell is used to screen the test objects. Specifically, when the user equipment is located, the signal quality of the serving cell is less than the first threshold value, and the signal quality of the same-frequency neighboring cell of the serving cell does not meet the preset condition, directly according to the preset cycle, determine The relative position of the user equipment and the serving cell, and according to the determined relative position, obtain the area range for selecting the measurement object, and then select the measurement object from the area range and send it to the user equipment. If the user equipment does not select a target cell from the measurement objects within the period, the above process is repeated in the next period until the target cell is found.

To sum up, compared with the prior art, the cell handover method of the long-term evolution system in the embodiment of the present invention, when performing inter-frequency and inter-system measurement, the measurement objects of the user equipment are greatly reduced after being screened, and the time for measurement It is also relatively reduced, thereby reducing the adverse impact on the business and improving the user experience. At the same time, the shortening of the measurement time reduces the risk of the user equipment losing the best handover opportunity, and the handover failure rate is also greatly reduced.

second embodiment

According to another aspect of the embodiments of the present invention, there is also provided a cell handover device for a long-term evolution system, which is applied to a serving cell. As shown in FIG. 3 , the cell handover device 300 includes:

A receiving module 301, configured to receive signal quality detection information sent by the user equipment;

The first determining module 302 is configured to determine, according to the signal quality detection information received by the receiving module 301, where the user equipment is located, the signal quality of the serving cell is less than a first threshold, and the serving cell determining the first position of the user equipment relative to the serving cell when the signal quality of the co-frequency neighboring cell does not meet the preset condition;

The second determination module 303 is configured to determine a first area range for selecting a first measurement object according to the first position determined by the first determination module 302;

The first selection module 304 is configured to select a cell located in the first area range determined by the second determination module 303 from neighboring cells of different frequencies and different systems of the serving cell as the first measurement object , and send it to the user equipment;

The control module 305 is configured to control the user equipment to switch to the target cell when the user equipment selects a target cell whose signal quality meets the preset condition from the first measurement object.

Optionally, as shown in FIG. 4, the second determining module 303 includes:

The first determining unit 3031 is configured to determine the pointing direction of the user equipment relative to the base station of the serving cell according to the first position;

The second determination unit 3032 is configured to determine the second area range obtained by scanning the pointing direction towards the first rotation direction by a first preset angle;

The third determination unit 3033 is configured to determine a third area range scanned by the first preset angle when the pointing direction is rotated toward the second rotation direction;

The fourth determining unit 3034 is configured to determine, in a circumferential direction centered on the base station of the serving cell, a range other than the second area range and the third area range as the first area range.

Optionally, as shown in FIG. 4, the second determining module 303 includes:

A fifth determining unit 3035, configured to determine an angle of arrival AoA at which the user equipment arrives at the base station of the serving cell according to the first position;

A sixth determining unit 3036, configured to determine a second preset angle X that determines the boundary of the first region;

The seventh determining unit 3037 is configured to determine the first boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and the first formula Y1=(AoA+X)mod360° Angle value Y1;

The eighth determination unit 3038 is configured to determine the second angle of the first area range according to the angle of arrival AoA and the second preset angle X, and the second formula Y2=(AoA-X+360°)mod360° The angle value Y2 of the second boundary;

The ninth determination unit 3039 is configured to set the angle value in the area range between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in the circumferential direction centered on the base station of the serving cell , determined as the first area range.

Optionally, the first selection module 304 is specifically configured to:

From the adjacent cells of different frequency and different systems of the serving cell, select a cell whose orientation angle is between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, as the first measurement object .

Optionally, as shown in FIG. 4, the cell switching device further includes:

The third determining module 306 is configured to: when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object, according to a preset cycle, when the first cycle arrives, determining a second location of the user equipment relative to the serving cell;

A fourth determination module 307, configured to determine a second area range for selecting a second measurement object according to the second position determined by the third determination module 306;

The second selection module 308 is configured to select a cell located in the second area determined by the fourth determination module 307 from neighboring cells of different frequencies and different systems of the serving cell as the second measurement object , and send it to the user equipment;

The fifth determining module 309 is configured to, when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the second measurement object, according to the preset cycle, arrive in the second cycle , determining a third position of the user equipment relative to the serving cell until the target cell is found.

In the cell handover device of the long-term evolution system according to the embodiment of the present invention, the signal quality of the serving cell at the position where the user equipment is located is determined by the first determining module 302 according to the signal quality detection information received by the receiving module 301 limit value, and the signal quality of the same-frequency neighboring cell of the serving cell does not meet the preset condition, then determine the first position of the user equipment relative to the serving cell, so that the second determining module 303 can The first location determines the first area range for selecting the first measurement object, and then triggers the first selection module 304 to select a cell located in the first area range from neighboring cells of the serving cell with different frequencies and different systems , as the first measurement object, and sent to the user equipment, so that the user equipment selects a target cell whose signal quality meets the preset condition from the first measurement object, and finally controls the user through the control module 305 The device switches to the target cell.

It can be seen that the cell handover device of the long-term evolution system in the embodiment of the present invention can filter the measurement objects from the neighboring cells of different frequencies and different systems of the serving cell according to the relative position of the user equipment and the serving cell, thereby shortening the measurement time of the user equipment , reduce adverse effects on normal business, and improve user experience.

What has been described above is a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can also be made without departing from the principles described in the present invention. within the scope of protection of the invention.

Claims (10)

1. A cell handover method of a long term evolution system, applied to a serving cell, characterized in that the cell handover method comprises: Receive signal quality detection information sent by the user equipment; When it is determined according to the signal quality detection information that at the location of the user equipment, the signal quality of the serving cell is less than a first threshold value, and the signal quality of the same-frequency neighboring cells of the serving cell does not meet a preset condition, determining a first location of the user equipment relative to the serving cell; According to the first position, determine a first area range for selecting a first measurement object; Selecting a cell located in the first area range as the first measurement object from neighboring cells of the serving cell with different frequencies and different systems, and sending it to the user equipment; When the user equipment selects a target cell whose signal quality satisfies the preset condition from the first measurement object, control the user equipment to handover to the target cell. 2. The cell handover method according to claim 1, wherein the determining the first area range for selecting the first measurement object according to the first position comprises: determining a pointing direction of the user equipment relative to a base station of the serving cell according to the first position; Determining the range of the second area obtained by scanning the pointing direction towards the first rotation direction at a first preset angle; determining that the pointing direction rotates the first preset angle to scan a third area range toward the second rotation direction; In a circumferential direction centered on the base station of the serving cell, a range other than the second area range and the third area range is determined as the first area range. 3. The cell handover method according to claim 1, wherein the determining the first area range for selecting the first measurement object according to the first position comprises: determining an angle of arrival AoA at which the user equipment arrives at the base station of the serving cell according to the first position; determining a second preset angle X that determines the boundary of the first area; According to the angle of arrival AoA and the second preset angle X, and the first formula Y1=(AoA+X)mod360°, determine the angle value Y1 of the first boundary of the first area range; According to the angle of arrival AoA and the second preset angle X, and the second formula Y2=(AoA-X+360°)mod360°, determine the angle value Y2 of the second boundary of the first area range; In the circumferential direction centered on the base station of the serving cell, the angle value is located between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, which is determined as the first area range . 4. The cell handover method according to claim 3, wherein the cell located in the first area range is selected from the neighboring cells of different frequency and different systems of the serving cell as the first measurement object, specifically: From the adjacent cells of different frequency and different systems of the serving cell, select a cell whose orientation angle is between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, as the first measurement object . 5. The cell handover method according to any one of claims 1 to 4, characterized in that, a cell located in the first area is selected from neighboring cells of different frequencies and different systems of the serving cell as the cell. After the step of first measuring the object and sending it to the user equipment, the method further includes: When the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object, according to the preset cycle, when the first cycle arrives, determine that the user equipment is relatively the second location of the serving cell; According to the second position, determine a second area range for selecting a second measurement object; Selecting a cell located in the second area as the second measurement object from neighboring cells of the serving cell with different frequencies and different systems, and sending it to the user equipment; When the user equipment does not select a target cell whose signal quality satisfies the preset condition from the second measurement object, according to the preset period, when the second period arrives, determine that the user equipment is relatively at the third position of the serving cell until the target cell is found. 6. A cell switching device of a long-term evolution system, which is applied to a serving cell, wherein the cell switching device comprises: A receiving module, configured to receive signal quality detection information sent by the user equipment; The first determining module is configured to determine, according to the signal quality detection information received by the receiving module, that at the location of the user equipment, the signal quality of the serving cell is less than a first threshold, and the same of the serving cell determining a first position of the user equipment relative to the serving cell when the signal quality of the frequency neighbor cell does not meet the preset condition; A second determination module, configured to determine a first area range for selecting a first measurement object according to the first position determined by the first determination module; A first selection module, configured to select a cell located in the first area range determined by the second determination module from neighboring cells of different frequencies and different systems of the serving cell as the first measurement object, and sent to the user equipment; A control module, configured to control the user equipment to switch to the target cell when the user equipment selects a target cell whose signal quality meets the preset condition from the first measurement object. 7. The cell handover device according to claim 6, wherein the second determining module comprises: a first determining unit, configured to determine a pointing direction of the user equipment relative to a base station of the serving cell according to the first position; The second determination unit is configured to determine a second area range obtained by scanning the pointing direction towards the first rotation direction at a first preset angle; A third determination unit, configured to determine a third area range scanned by the first preset angle when the pointing direction is rotated toward the second rotation direction; The fourth determining unit is configured to determine, in a circumferential direction centered on the base station of the serving cell, a range other than the second area range and the third area range as the first area range. 8. The cell handover device according to claim 6, wherein the second determining module comprises: A fifth determining unit, configured to determine an angle of arrival AoA at which the user equipment arrives at the base station of the serving cell according to the first position; A sixth determining unit, configured to determine a second preset angle X that determines the boundary of the first region; A seventh determination unit, configured to determine the angle of the first boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and the first formula Y1=(AoA+X)mod360° value Y1; The eighth determination unit is configured to determine the second angle of the first area range according to the angle of arrival AoA and the second preset angle X, and the second formula Y2=(AoA-X+360°)mod360° The angular value of the boundary Y2; The ninth determination unit is configured to set the angle value in the area range between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in the circumferential direction centered on the base station of the serving cell, determined as the first area range. 9. The cell switching device according to claim 8, wherein the first selection module is specifically used for: From the adjacent cells of different frequency and different systems of the serving cell, select a cell whose orientation angle is between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary, as the first measurement object . 10. The cell handover device according to any one of claims 6 to 9, wherein the cell handover device further comprises: A third determining module, configured to determine, according to a preset period when the first period arrives, when the user equipment does not select a target cell whose signal quality meets the preset condition from the first measurement object a second location of the user equipment relative to the serving cell; A fourth determination module, configured to determine a second area range for selecting a second measurement object according to the second position determined by the third determination module; The second selection module is configured to select, from neighboring cells of different frequencies and different systems of the serving cell, a cell located in the second area range determined by the fourth determination module as the second measurement object, and sent to the user equipment; The fifth determining module is configured to: when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the second measurement object, according to the preset cycle, when the second cycle arrives , determining a third position of the user equipment relative to the serving cell until the target cell is found.