CN107295468B - Cell switching method and device of long-term evolution system - Google Patents
Cell switching method and device of long-term evolution system Download PDFInfo
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- CN107295468B CN107295468B CN201610201539.2A CN201610201539A CN107295468B CN 107295468 B CN107295468 B CN 107295468B CN 201610201539 A CN201610201539 A CN 201610201539A CN 107295468 B CN107295468 B CN 107295468B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
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Abstract
The invention provides a cell switching method and a device of a long-term evolution system, wherein the method comprises the following steps: receiving signal quality detection information sent by user equipment; when the position of the user equipment is determined according to the signal quality detection information, the signal quality of a serving cell is smaller than a first threshold value, and the signal quality of a same-frequency adjacent cell of the serving cell does not meet a preset condition, determining a first position of the user equipment relative to the serving cell; determining a first area range for selecting a first measuring object according to the first position; selecting a cell positioned in a first area range from a pilot frequency inter-system adjacent cell of a service cell as a first measurement object, and sending the cell to user equipment; and when the user equipment selects the target cell from the first measurement object, controlling the user equipment to switch to the target cell. According to the scheme of the invention, the measurement object is screened according to the relative position of the user equipment and the service cell, so that the cell switching time of the user equipment is greatly shortened, and the user experience is improved.
Description
Technical Field
The present invention relates to the field of wireless communication systems, and in particular, to a cell handover method and apparatus for a long term evolution system.
Background
In the third generation long Term Evolution (L ong Term Evolution, L TE) system, handover is one of the important technologies of L TE, and it can make a User Equipment (UE) in a mobile state smoothly enter from one cell to another cell.
In the prior art, a basic procedure of a UE performing cell handover is shown in fig. 1. In fig. 1, a cell a is a serving cell of a UE, a cell B is a neighboring cell of the cell a, the UE moves from the cell a to the cell B, and the cell B is referred to as a target cell of the UE. The procedure for handover of the UE from cell a to cell B is as follows:
the first step is as follows: the UE periodically measures the signal quality of cell a. This event is reported to cell a if the signal quality of cell a is found to be below a certain threshold.
The second step is that: and the cell A orders the UE to measure whether the signal quality of the surrounding co-frequency adjacent cells meets the condition. If the same-frequency adjacent cell meets the condition, the same-frequency adjacent cell is a switching target cell, the UE reports the event to the cell A, and the fourth step is carried out. And if no co-frequency adjacent cell meets the condition, the cell A commands the UE to carry out inter-frequency and inter-system measurement.
The third step: the UE finds that the signal quality of the cell B meets the condition through measurement, the cell B is a handover target cell, and the UE reports the event to the cell A.
The fourth step: cell a commands the UE to handover to the target cell.
Wherein the disadvantages of the above procedure are in the measurement of the second step. If the UE selects a target cell with different frequencies, the pilot frequency and inter-system measurement is started, and the cell A does not know the position of the UE, so the cell A can command the UE to measure the frequency points of all the adjacent pilot frequency and inter-system cells around, and at this time, the number of measurement objects is large. In dense urban areas, the pilot frequency and inter-system adjacent areas of the cell A are more. When the number of the measurement objects is too many, the UE consumes more time to perform the measurement, thereby affecting the normal service of the UE, causing the UE to consume more electric power, affecting the user experience, and even causing a call drop. For example, as shown in fig. 1, it is assumed that cells a to F belong to different frequency points, and although the target cell of the UE is cell B, cell a may instruct the UE to measure all frequency points to which cells B to F belong because cell a does not know the information.
Disclosure of Invention
In order to overcome the above problems in the prior art, embodiments of the present invention provide a cell switching method and apparatus for a long term evolution system, which can screen a measurement object from a different-frequency different-system neighboring cell of a serving cell according to a relative position between a user equipment and the serving cell, thereby shortening a measurement time of the user equipment, reducing adverse effects on normal services, and improving user experience.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an aspect of the embodiments 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:
receiving signal quality detection information sent by user equipment;
when the position of the user equipment is determined according to the signal quality detection information, the signal quality of a serving cell is smaller than a first threshold value, and the signal quality of a co-frequency adjacent cell of the serving cell does not meet a preset condition, determining a first position of the user equipment relative to the serving cell;
determining a first area range for selecting a first measuring object according to the first position;
selecting a cell positioned in the range of the first area from the pilot frequency inter-system neighbor cells of the serving cell as the first measurement object, and sending the cell to the user equipment;
and when the user equipment selects a target cell with signal quality meeting the preset condition from the first measurement object, controlling the user equipment to be switched to the target cell.
In the foregoing solution, the determining to select the first area range of 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 a second area range obtained by scanning by rotating the pointing direction by a first preset angle towards a first rotating direction;
determining a third area range scanned by rotating the pointing direction towards a second rotating direction by the first preset angle;
determining a range excluding the second area range and the third area range as the first area range in a circumferential direction around the base station of the serving cell.
In the foregoing solution, the determining to select the first area range of the first measurement object according to the first position includes:
determining an angle of arrival (AoA) of the user equipment to a base station of the serving cell according to the first position;
determining a second preset angle X for determining the boundary of the first area range;
determining an angle value Y1 of a first boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a first formula Y1 ═ AoA + X) mod360 °;
determining an angle value Y2 of a second boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a second formula Y2 ═ AoA-X +360 ° mod360 °;
an area range having an angle value between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in a circumferential direction centered on the base station of the serving cell is determined as the first area range.
In the foregoing scheme, the selecting, from the inter-frequency inter-system neighboring cell of the serving cell, a cell located in the first area range as the first measurement object specifically includes:
and selecting a cell with a direction angle between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary from the inter-frequency inter-system neighbor cell of the serving cell as the first measurement object.
In the foregoing solution, after the step of selecting a cell located in the first area range from the inter-frequency inter-system neighboring cell of the serving cell as the first measurement object and sending the cell to the user equipment, the method further includes:
when the user equipment does not select a target cell with signal quality meeting the preset condition from the first measurement object, according to a preset period, when the first period arrives, determining a second position of the user equipment relative to the serving cell;
determining a fourth area range for selecting a second measuring object according to the second position;
selecting a cell positioned in the range of the fourth area from the pilot frequency inter-system neighbor cell of the serving cell as the second measurement object, and sending the second measurement object to the user equipment;
and when the user equipment does not meet the target cell of the preset condition from the signal quality in the second measurement object, determining a third position of the user equipment relative to the serving cell according to the preset period when a second period arrives until the target cell is found.
According to another aspect of the embodiments of the present invention, there is also provided a cell switching apparatus of a long term evolution system, which is applied to a serving cell, the cell switching apparatus including:
the receiving module is used for receiving signal quality detection information sent by user equipment;
a first determining module, configured to determine a first position of the user equipment relative to the serving cell when the position of the user equipment is determined according to the signal quality detection information received by the receiving module, the signal quality of the serving cell is smaller than a first threshold, and the signal quality of a co-frequency neighboring cell of the serving cell does not meet a preset condition;
the second determining module is used for determining a first area range for selecting a first measuring object according to the first position determined by the first determining module;
a first selecting module, configured to select, from inter-frequency inter-system neighboring cells of the serving cell, a cell located in the first area range determined by the second determining module, as the first measurement object, and send the first measurement object to the user equipment;
and the control module is used for controlling the user equipment to be switched to the target cell when the user equipment selects the target cell with the signal quality meeting the preset condition from the first measurement object.
In the foregoing solution, the second determining module includes:
a first determining unit, configured to determine, according to the first position, a pointing direction of the user equipment with respect to a base station of the serving cell;
the second determining unit is used for determining a second area range obtained by scanning by rotating the pointing direction towards the first rotating direction by a first preset angle;
a third determining unit, configured to determine a third area range scanned by rotating the pointing direction toward a second rotation direction by the first preset angle;
a fourth determining unit, configured to determine, as the first area range, a range excluding the second area range and the third area range in a circumferential direction around a base station of the serving cell as a center.
In the foregoing solution, the second determining module includes:
a fifth determining unit, configured to determine, according to the first location, an angle of arrival AoA of the user equipment to a base station of the serving cell;
a sixth determining unit configured to determine a second preset angle X that determines a boundary of the first area range;
a seventh determining unit, configured to determine an 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 a first formula Y1 ═ i (AoA + X) mod360 °;
an eighth determining unit, configured to determine an angle value Y2 of a second boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a second formula Y2 ═ of (AoA-X +360 °) mod360 °;
a ninth determining unit configured to determine, as the first area range, an area range having an angle value between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in a circumferential direction centered on the base station of the serving cell.
In the foregoing scheme, the first selecting module is specifically configured to:
and selecting a cell with a direction angle between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary from the inter-frequency inter-system neighbor cell of the serving cell as the first measurement object.
In the foregoing solution, the cell switching apparatus further includes:
a third determining module, configured to determine, according to a preset period and when a first period arrives, a second position of the user equipment relative to the serving cell when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object;
a fourth determining module, configured to determine a fourth area range for selecting a second measurement object according to the second position determined by the second determining module;
a second selecting module, configured to select, from inter-frequency inter-system neighboring cells of the serving cell, a cell located in the fourth area range determined by the third determining module, as the second measurement object, and send the second measurement object to the user equipment;
a fifth determining module, configured to, when the user equipment does not select a target cell with signal quality meeting the preset condition from the second measurement object, determine, according to the preset period, a third position of the user equipment relative to the serving cell when a second period arrives, until the target cell is found.
The embodiment of the invention has the beneficial effects that:
in the cell switching method of the long term evolution system of the embodiment of the present invention, at a location where a user equipment is located, when a signal quality of a serving cell is less than a first threshold and a signal quality of a co-frequency neighboring cell of the serving cell does not satisfy a preset condition, a relative position of the user equipment and the serving cell is determined to screen a measurement object from a different-frequency different-system neighboring cell of the serving cell and send the selected measurement object to the user equipment, so that the user equipment selects a target cell whose signal quality satisfies the preset condition from the measurement object, thereby switching the user equipment to the target cell. Therefore, the cell switching method of the long term evolution system in the embodiment of the present invention enables the number of measurement objects of the user equipment to be greatly reduced after screening when performing inter-frequency inter-system measurement, thereby reducing measurement time, alleviating adverse effects on services, and improving user experience.
Drawings
Fig. 1 is a schematic diagram illustrating selection of a measurement object when a UE performs cell handover in the prior art;
fig. 2 is a flowchart illustrating a cell handover method in a long term evolution system according to a first embodiment of the present invention;
fig. 3 is a block diagram of a cell switching apparatus of a long term evolution system according to a second embodiment of the present invention;
fig. 4 shows a second block diagram of a cell handover apparatus of a long term evolution system according to a second embodiment of the present invention;
FIG. 5 is a schematic view showing a range of an area where a measurement object is obtained by rotating a predetermined angle according to the first embodiment of the present invention;
FIG. 6 shows a schematic view of the angle of arrival in a first embodiment of the invention;
FIG. 7 is a schematic view showing one of the regions for selecting the measurement object according to the first embodiment of the present invention;
FIG. 8 is a second schematic diagram illustrating the range of the region to be measured according to the first embodiment of the present invention;
fig. 9 is a third schematic diagram of the area range of the selected measurement object according to 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. While 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 to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
First embodiment
According to an aspect of the embodiments of the present invention, there is provided a cell handover method of a long term evolution system, which is applied to a serving cell, as shown in fig. 2, the method includes:
The user equipment periodically tests the signal quality of the serving cell during use. If the signal quality of the serving cell is found to be below a certain threshold, e.g. a first threshold, this event is reported to the serving cell. At this time, the serving cell may instruct the user equipment to measure whether the signal quality of the neighboring cells of the same frequency meets a preset condition. That is, a cell with signal quality meeting a preset condition is searched from a co-frequency neighboring cell of the serving cell as a target cell. If the same-frequency adjacent cell meets the preset condition, the same-frequency adjacent cell is the target cell, and the user equipment reports the event to the serving cell. If the cells meeting the preset conditions in the same-frequency adjacent cells do not exist, the user equipment also reports the serving cell, namely, the user equipment sends signal quality detection information to the serving cell to inform the serving cell, and when cell switching is needed, a target cell with the signal quality meeting the preset conditions is not searched from the same-frequency adjacent cells.
The preset condition is that the signal quality of the target cell reaches a second threshold value, or the signal quality of the target cell is higher than the signal quality of the serving cell by a preset value.
The signal quality detection information sent by the user equipment to the serving cell carries information that the signal quality of the serving cell is smaller than a first threshold value at the current position of the user equipment, and information that the signal quality of the same-frequency neighboring cell of the serving cell does not meet a preset condition. And 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 switching.
When the serving cell obtains the information from the received signal quality detection information, the serving cell needs to determine the relative position of the ue to itself.
When cell switching is performed, when a cell with signal quality meeting a preset condition does not exist in a same-frequency adjacent cell of a serving cell, a measurement object of which the signal quality is measured by user equipment needs to be selected from an inter-frequency and inter-system adjacent cell of the serving cell. In the embodiment of the invention, in order to reduce the measurement objects and thus 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 and is used as a condition for screening the measurement objects.
The specific manner of selecting the first area range of the first measurement object is determined according to the first position of the user equipment relative to the serving cell, and the following two manners may be adopted.
The first method is as follows: specifically, step 203 comprises:
determining a pointing direction of the user equipment relative to a base station of the serving cell according to the first position;
determining a second area range obtained by scanning by rotating the pointing direction by a first preset angle towards a first rotating direction;
determining a third area range scanned by rotating the pointing direction towards a second rotating direction by the first preset angle;
determining a range excluding the second area range and the third area range as the first area range in a circumferential direction around the base station of the serving cell.
The first preset angle may be 60 °, 90 °, 120 °, or other angles. The larger the first preset angle is, the fewer the first measurement objects included in the first area range are, and the greater the possibility of missing the real target cell of the user equipment is. Conversely, the smaller the first preset angle is, the more the first measurement objects are included in the first area range, and the effectiveness of the algorithm is reduced.
For example, when the first preset angle is 90 °, as shown in fig. 5, the serving cell is an a cell, and the ue is oriented relative to the cell a, clockwise rotated by 90 °, swept through the second area range, counterclockwise rotated by a third area range, and then a range excluding the second area range and the third area range is the first area range in the circumferential direction around the base station of the cell a, that is, the α range shown in fig. 5 is the first area range.
The second method comprises the following steps: specifically, step 203 comprises:
determining an angle of arrival (AoA) of the user equipment to a base station of the serving cell according to the first position;
determining a second preset angle X for determining the boundary of the first area range;
determining an angle value Y1 of a first boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a first formula Y1 ═ AoA + X) mod360 °;
determining an angle value Y2 of a second boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a second formula Y2 ═ AoA-X +360 ° mod360 °;
an area range having an angle value between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in a circumferential direction centered on the base station of the serving cell is determined as the first area range.
The angle of arrival AoA of the user equipment to the base station of the serving cell is an angle of arrival of a signal of the user equipment to the base station of the serving cell measured by the serving cell. As shown in fig. 6, the cell a is a serving cell, and a due north direction line is rotated clockwise to a signal position of the user equipment by an angle of AoA around a base station of the cell a.
In addition, the second preset angle may also be 60 °, 90 °, 120 °, or other angle values. The larger the second preset angle is, the fewer the first measurement objects included in the first area range are, and the higher the possibility of missing the real target cell of the user equipment is. Conversely, the smaller the second preset angle is, the more the first measurement objects are included in the first area range, and the effectiveness of the algorithm is reduced.
Where the first region range is represented by α, (AoA + X) mod360 ° ≦ α ≦ AoA-X +360 ° -mod 360 °. for example, when X is 90 °, as shown in fig. 7, (AoA +90 °) mod360 ° ≦ α ≦ AoA-90 ° +360 °, whereas if AoA is 60 °, 150 ° ≦ α ≦ 330 ° may be obtained by calculation, when X is 60 °, as shown in fig. 8, (AoA +60 °) mod360 ° ≦ α ≦ AoA-60 ° +360 °, when X is 120 °, as shown in fig. 9, (AoA +120 °) 360 ° ≦ α ≦ aomod a-120 ° +360 °, where N shown in fig. 7-9 indicates a positive north direction.
By determining the first area range in the second mode, the area covered by the first area range can be intuitively obtained from the aspect of the angle value, so that the search of the measuring object from the area is facilitated.
After the first area range of the first measurement object is determined, the serving cell selects an inter-frequency inter-system neighbor cell from the first area range as the first measurement object, and sends the selected first measurement object to the user equipment, so that the user equipment measures the signal quality of the first measurement object, and a target cell with the signal quality meeting a preset condition is selected from the first measurement object.
In addition, if step 203 determines the first area range in the second manner, step 204 specifically includes:
and selecting a cell with a direction angle between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary from the inter-frequency inter-system neighbor cell of the serving cell as the first measurement object.
The azimuth angle of a different-frequency different-system neighboring cell is an angle rotated by a north-pointing direction line clockwise to the position of the different-frequency different-system neighboring cell by taking a base station of a serving cell as a center. Therefore, when the second method is adopted in step 204 to determine the first area range, the inter-frequency inter-system neighbor whose azimuth is within the value interval of [ Y1, Y2] may be selected as the first measurement object.
When the user equipment finds that the signal quality of a certain or some adjacent cells meets the preset conditions through measurement, the user equipment reports the event to the serving cell, and the serving cell commands the user equipment to be switched to the target cell. If the user equipment selects a plurality of cells with signal quality meeting the preset condition from the first measurement object, generally, one cell is determined as a target cell from the cells with signal quality meeting the preset condition according to relevant regulations of manufacturers.
When the user equipment does not select a target cell from the first measurement objects, where the signal quality of the target cell meets the preset condition, after step 205, the method may further include:
when the user equipment does not select a target cell with signal quality meeting the preset condition from the first measurement object, according to a preset period, when the first period arrives, determining a second position of the user equipment relative to the serving cell;
determining a fourth area range for selecting a second measuring object according to the second position;
selecting a cell positioned in the range of the fourth area from the pilot frequency inter-system neighbor cell of the serving cell as the second measurement object, and sending the second measurement object to the user equipment;
when the user equipment does not select a target cell with signal quality meeting the preset condition from the second measurement object, according to the preset period, when a second period is reached, determining a third position of the user equipment relative to the serving cell until the target cell is found.
That is, when the ue does not select a target cell with a signal quality meeting a preset condition from the first measurement object, the serving cell may periodically determine the relative position of the ue in the subsequent time, and according to the determined relative position, obtain the area range of the selected measurement object, and then select the measurement object from the area range and send the selected measurement object to the ue. If the user equipment does not select the target cell from the measurement objects in the period, the process is repeatedly executed 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 meets a preset condition in a neighboring cell with the same frequency, the serving cell may periodically obtain the relative position of the user equipment and the serving cell according to a preset period to screen the test object. Specifically, when the signal quality of a serving cell is smaller than a first threshold value at the position of the user equipment and the signal quality of a co-frequency neighboring cell of the serving cell does not meet a preset condition, the relative position of the user equipment and the serving cell is directly determined according to a preset period, an area range for selecting a measurement object is obtained according to the determined relative position, and then the measurement object is selected from the area range and sent to the user equipment. If the user equipment does not select the target cell from the measurement objects in the period, the process is repeatedly executed in the next period until the target cell is found.
In summary, compared with the prior art, in the cell handover method of the long term evolution system according to the embodiments of the present invention, when performing inter-frequency inter-system measurement, the measurement objects of the user equipment are screened and then greatly reduced, and the time for measurement is also relatively reduced, so that adverse effects on services are reduced, and user experience is improved. Meanwhile, the risk that the user equipment loses the best switching opportunity is reduced due to the shortening of the measurement time, and the switching failure rate is greatly reduced.
Second embodiment
According to another aspect of the embodiments of the present invention, there is also provided a cell switching apparatus of a long term evolution system, which is applied to a serving cell, as shown in fig. 3, the cell switching apparatus 300 includes:
a receiving module 301, configured to receive signal quality detection information sent by a user equipment;
a first determining module 302, configured to determine a first position of the user equipment relative to the serving cell when it is determined that the user equipment is located at the position according to the signal quality detection information received by the receiving module 301, the signal quality of the serving cell is smaller than a first threshold, and the signal quality of a co-frequency neighboring cell of the serving cell does not meet a preset condition;
a second determining module 303, configured to determine, according to the first position determined by the first determining module 302, a first area range in which to select a first measurement object;
a first selecting module 304, configured to select, from inter-frequency inter-system neighboring cells of the serving cell, a cell located in the first area range determined by the second determining module 303, as the first measurement object, and send the first measurement object to the user equipment;
a control module 305, configured to control the ue to switch to a target cell when the ue selects the target cell with a signal quality meeting the preset condition from the first measurement object.
Optionally, as shown in fig. 4, the second determining module 303 includes:
a first determining unit 3031, configured to determine, according to the first location, a pointing direction of the user equipment with respect to a base station of the serving cell;
a second determining unit 3032, configured to determine a second region range obtained by scanning the pointing direction by rotating the pointing direction by a first preset angle toward the first rotation direction;
a third determining unit 3033, configured to determine a third area range scanned by rotating the pointing direction by the first preset angle toward the second rotation direction;
a fourth determining unit 3034, configured to determine, as the first area range, a range excluding the second area range and the third area range in a circumferential direction around the base station of the serving cell.
Optionally, as shown in fig. 4, the second determining module 303 includes:
a fifth determining unit 3035, configured to determine, according to the first location, an angle of arrival AoA of the user equipment to a base station of the serving cell;
a sixth determining unit 3036, configured to determine a second preset angle X that determines a boundary of the first region range;
a seventh determining unit 3037, configured to determine an 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 a first formula Y1 ═ AoA + X) mod360 °;
an eighth determining unit 3038, configured to determine an angle value Y2 of the second boundary of the first area range according to the arrival angle AoA and the second preset angle X, and a second formula Y2 ═ AoA-X +360 ° (AoA-X +360 °) mod360 °;
a ninth determining unit 3039, configured to determine, as the first area range, an area range having an angle value between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in a circumferential direction around the base station of the serving cell.
Optionally, the first selecting module 304 is specifically configured to:
and selecting a cell with a direction angle between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary from the inter-frequency inter-system neighbor cell of the serving cell as the first measurement object.
Optionally, as shown in fig. 4, the cell switching apparatus further includes:
a third determining module 306, configured to determine, according to a preset period and when a first period arrives when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object, a second position of the user equipment relative to the serving cell;
a fourth determining module 307, configured to determine a fourth area range for selecting a second measurement object according to the second position determined by the third determining module 306;
a second selecting module 308, configured to select, from inter-frequency inter-system neighboring cells of the serving cell, a cell located in the fourth area range determined by the fourth determining module 307, as the second measurement object, and send the second measurement object to the user equipment;
a fifth determining module 309, configured to, when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the second measurement object, determine, according to the preset period, a third position of the user equipment relative to the serving cell when a second period arrives, until the target cell is found.
In the cell switching apparatus of the long term evolution system according to the embodiment of the present invention, the first determining module 302 determines, 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 smaller than a first threshold, and the signal quality of the co-frequency neighboring cell of the serving cell does not satisfy a preset condition, and then determines the first location of the user equipment relative to the serving cell, so that the second determining module 303 may determine, according to the determined first location, a first area range in which a first measurement object is selected, and further trigger the first selecting module 304 to select, from the inter-frequency inter-system neighboring cells of the serving cell, a cell located in the first area range as the first measurement object, and send the first measurement object to the user equipment, so that the user equipment selects, from the first measurement object, a target cell whose signal quality satisfies the preset condition, finally, the control module 305 controls the ue to switch to the target cell.
Therefore, the cell switching device of the long term evolution system in the embodiment of the present invention can screen the measurement object from the inter-frequency inter-system neighboring cell 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, reducing the adverse effect on the normal service, and improving the user experience.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. A cell switching method of a long term evolution system is applied to a serving cell, and is characterized in that the cell switching method comprises the following steps:
receiving signal quality detection information sent by user equipment;
when the position of the user equipment is determined according to the signal quality detection information, the signal quality of a serving cell is smaller than a first threshold value, and the signal quality of a co-frequency adjacent cell of the serving cell does not meet a preset condition, determining a first position of the user equipment relative to the serving cell;
determining a first area range for selecting a first measuring object according to the first position;
selecting a cell positioned in the range of the first area from the pilot frequency inter-system neighbor cells of the serving cell as the first measurement object, and sending the cell to the user equipment;
and when the user equipment selects a target cell with signal quality meeting the preset condition from the first measurement object, controlling the user equipment to be switched to the target cell.
2. The cell switching method of claim 1, wherein said determining a first area range in which to select a first measurement object based on the first location comprises:
determining a pointing direction of the user equipment relative to a base station of the serving cell according to the first position;
determining a second area range obtained by scanning by rotating the pointing direction by a first preset angle towards a first rotating direction;
determining a third area range scanned by rotating the pointing direction towards a second rotating direction by the first preset angle;
determining a range excluding the second area range and the third area range as the first area range in a circumferential direction around the base station of the serving cell.
3. The cell switching method of claim 1, wherein said determining a first area range in which to select a first measurement object based on the first location comprises:
determining an angle of arrival (AoA) of the user equipment to a base station of the serving cell according to the first position;
determining a second preset angle X for determining the boundary of the first area range;
determining an angle value Y1 of a first boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a first formula Y1 ═ AoA + X) mod360 °;
determining an angle value Y2 of a second boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a second formula Y2 ═ AoA-X +360 ° mod360 °;
an area range having an angle value between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in a circumferential direction centered on the base station of the serving cell is determined as the first area range.
4. The cell handover method according to claim 3, wherein the selecting, from inter-frequency inter-system neighboring cells of the serving cell, a cell located in the first area range as the first measurement object specifically includes:
and selecting a cell with a direction angle between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary from the inter-frequency inter-system neighbor cell of the serving cell as the first measurement object.
5. The cell switching method according to any one of claims 1 to 4, wherein after the step of selecting a cell located in the first area from inter-frequency-inter-system neighboring cells of the serving cell as the first measurement object and sending the cell to the user equipment, the method further comprises:
when the user equipment does not select a target cell with signal quality meeting the preset condition from the first measurement object, according to a preset period, when the first period arrives, determining a second position of the user equipment relative to the serving cell;
determining a fourth area range for selecting a second measuring object according to the second position;
selecting a cell positioned in the range of the fourth area from the pilot frequency inter-system neighbor cell of the serving cell as the second measurement object, and sending the second measurement object to the user equipment;
when the user equipment does not select a target cell with signal quality meeting the preset condition from the second measurement object, according to the preset period, when a second period is reached, determining a third position of the user equipment relative to the serving cell until the target cell is found.
6. A cell switching apparatus of a long term evolution system, applied to a serving cell, the cell switching apparatus comprising:
the receiving module is used for receiving signal quality detection information sent by user equipment;
a first determining module, configured to determine a first position of the user equipment relative to the serving cell when the position of the user equipment is determined according to the signal quality detection information received by the receiving module, the signal quality of the serving cell is smaller than a first threshold, and the signal quality of a co-frequency neighboring cell of the serving cell does not meet a preset condition;
the second determining module is used for determining a first area range for selecting a first measuring object according to the first position determined by the first determining module;
a first selecting module, configured to select, from inter-frequency inter-system neighboring cells of the serving cell, a cell located in the first area range determined by the second determining module, as the first measurement object, and send the first measurement object to the user equipment;
and the control module is used for controlling the user equipment to be switched to the target cell when the user equipment selects the target cell with the signal quality meeting the preset condition from the first measurement object.
7. The cell switching apparatus of claim 6, wherein the second determining module comprises:
a first determining unit, configured to determine, according to the first position, a pointing direction of the user equipment with respect to a base station of the serving cell;
the second determining unit is used for determining a second area range obtained by scanning by rotating the pointing direction towards the first rotating direction by a first preset angle;
a third determining unit, configured to determine a third area range scanned by rotating the pointing direction toward a second rotation direction by the first preset angle;
a fourth determining unit, configured to determine, as the first area range, a range excluding the second area range and the third area range in a circumferential direction around a base station of the serving cell as a center.
8. The cell switching apparatus of claim 6, wherein the second determining module comprises:
a fifth determining unit, configured to determine, according to the first location, an angle of arrival AoA of the user equipment to a base station of the serving cell;
a sixth determining unit configured to determine a second preset angle X that determines a boundary of the first area range;
a seventh determining unit, configured to determine an 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 a first formula Y1 ═ i (AoA + X) mod360 °;
an eighth determining unit, configured to determine an angle value Y2 of a second boundary of the first area range according to the angle of arrival AoA and the second preset angle X, and a second formula Y2 ═ of (AoA-X +360 °) mod360 °;
a ninth determining unit configured to determine, as the first area range, an area range having an angle value between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary in a circumferential direction centered on the base station of the serving cell.
9. The cell switching apparatus of claim 8, wherein the first selection module is specifically configured to:
and selecting a cell with a direction angle between the angle value Y1 of the first boundary and the angle value Y2 of the second boundary from the inter-frequency inter-system neighbor cell of the serving cell as the first measurement object.
10. The cell switching apparatus according to any one of claims 6 to 9, wherein the cell switching apparatus further comprises:
a third determining module, configured to determine, according to a preset period and when a first period arrives, a second position of the user equipment relative to the serving cell when the user equipment does not select a target cell whose signal quality satisfies the preset condition from the first measurement object;
a fourth determining module, configured to determine a fourth area range for selecting a second measurement object according to the second position determined by the third determining module;
a second selecting module, configured to select, from inter-frequency inter-system neighboring cells of the serving cell, a cell located in the fourth area range determined by the fourth determining module, as the second measurement object, and send the second measurement object to the user equipment;
a fifth determining module, configured to, when the user equipment does not select a target cell with signal quality meeting the preset condition from the second measurement object, determine, according to the preset period, a third position of the user equipment relative to the serving cell when a second period arrives, until the target cell is found.
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| CN110290473B (en) * | 2018-03-19 | 2021-07-27 | 成都鼎桥通信技术有限公司 | Switching method and device |
| CN111836313B (en) * | 2019-04-17 | 2022-08-09 | 华为技术有限公司 | Indication method for cell switching measurement, network equipment and terminal |
| CN112218343B (en) * | 2019-07-12 | 2023-09-05 | 中国移动通信集团吉林有限公司 | Cell different frequency switching method, device and computer equipment |
| CN112839361B (en) * | 2019-11-22 | 2022-08-26 | 上海朗帛通信技术有限公司 | Method and device in communication node for wireless communication |
| CN115442858A (en) * | 2021-06-03 | 2022-12-06 | 中国移动通信集团四川有限公司 | Cell switching control method, device and equipment |
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