CN115002845A - Method and device for cell switching - Google Patents
Method and device for cell switching Download PDFInfo
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- CN115002845A CN115002845A CN202110224404.9A CN202110224404A CN115002845A CN 115002845 A CN115002845 A CN 115002845A CN 202110224404 A CN202110224404 A CN 202110224404A CN 115002845 A CN115002845 A CN 115002845A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W36/08—Reselecting an access point
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Abstract
The method and the device for switching the cells are characterized in that a source base station receives information of adjacent cells reported by UE (user equipment), when a first target cell in a switching path fails, the source base station determines that the adjacent cells of the UE do not comprise the first target cell, the switching path comprises information of a plurality of cells through which the UE sequentially passes, and the first target cell is a cell through which the UE passes next in the switching path. At this time, the source base station acquires the signal quality information of the adjacent cell of the first target cell, and selects a second target cell from the adjacent cell of the first target cell according to the signal quality of the adjacent cell of the first target cell to perform handover, so that when a cell in a handover path fails, the service of the UE is not interrupted or the communication quality is not reduced.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method and an apparatus for cell handover.
Background
When a User Equipment (UE) performs mobile communication, in order to ensure communication quality, a cell needs to be switched to a cell with better service quality. And the base station side is configured with a neighbor cell list, and when cell switching is carried out, a cell with good service quality is selected from the neighbor cell list as a target cell of the UE.
The cell switching method is suitable for low-speed moving scenes with the speed per hour lower than 130 kilometers per hour, the moving speed of the UE is very high in high-speed moving scenes such as high-speed rails, and the wireless environment where the UE is located is also changed rapidly. If the existing switching process is still adopted, the problem that the UE moves too fast to cause untimely switching can occur, in order to solve the problem that the UE is untimely switched, a network side configures a switching path for the UE, the switching path comprises a plurality of cells sequenced according to needs, and the UE is sequentially switched to each cell in the switching path according to the switching sequence.
However, in the prior art, the UE can only switch from the current cell to the next neighboring cell to be passed through according to the switching path, and if the radio environment of the next neighboring cell may be poor or the next neighboring cell fails, the service interruption or communication quality of the UE may be reduced, and the user requirement may not be met.
Disclosure of Invention
The application provides a cell switching method and a cell switching device, which can ensure the service continuity or the communication quality of UE in a high-speed mobile scene.
In a first aspect, the present application provides a method for cell handover, including:
a source base station receives information of a neighboring cell reported by User Equipment (UE);
the source base station judges whether the adjacent cell of the UE comprises a first target cell in a switching path, wherein the switching path comprises information of a plurality of cells which are sequentially passed by the UE, and the first target cell is a cell which is passed by the UE next in the switching path;
when the adjacent cell of the UE comprises the first target cell, the source base station controls the UE to be switched to the first target cell;
when the neighboring cell of the UE does not include the first target cell, the source base station obtains signal quality information of a neighboring cell of the first target cell, where the neighboring cell of the first target cell does not belong to the handover path;
when the UE is determined to be switched to a second target cell in the adjacent cells of the first target cell according to the signal quality information of the adjacent cells of the first target cell, the source base station adjusts the priority of the adjacent cell of the first target cell, wherein the adjusted priority of the second target cell is higher than the priority of other cells in the adjacent cells of the first target cell;
and the source base station controls the UE to be switched to the second target cell.
Optionally, the method further includes: and after the UE is successfully accessed to the second target cell, the source base station recovers the priority of the adjacent cell of the first target cell.
Optionally, the first target cell and/or the second target cell both meet a user service bearer requirement.
Optionally, when the neighboring cell of the UE includes the first target cell, the controlling, by the source base station, the UE to be switched to the first target cell includes:
when the adjacent cell of the UE comprises the first target cell, the source base station judges whether the first target cell meets the user service bearing requirement or not according to the signal quality information of the first target cell;
and when the first target cell meets the user service bearing requirement, the source base station controls the UE to be switched to the first target cell.
Optionally, after the source base station acquires the signal quality information of the neighboring cell of the first target cell, the method further includes:
the source base station determines an available cell meeting the user service bearing requirement from the adjacent cells of the first target cell according to the signal quality information of the adjacent cells of the first target cell;
and the source base station selects a cell with the best signal quality from available cells meeting the user service bearing requirement as the second target cell.
Optionally, the signal quality information of the neighboring cell of the first target cell includes the number of measurement reports reported by the neighboring cell in a preset time period, a reception level of each measurement report, a signal-to-noise ratio of each measurement report, and a background noise of each measurement report;
the method for determining, by the source base station, an available cell meeting a user service bearer requirement from neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell includes:
the source base station calculates a decision value according to the following formula:
wherein, Scr is the decision value, n is the number of measurement reports reported by the neighboring cell in a preset time period, Rs is the receiving level of the measurement report, Sinr is the signal-to-noise ratio of the measurement report, and Rt is the background noise of the measurement report;
and when the decision value is larger than a decision threshold, determining that the adjacent cell meets the user service bearing requirement.
Optionally, after the source base station obtains the signal quality information of the neighboring cell of the first target cell, the method further includes:
the source base station sends the signal quality information of the adjacent cell to core network equipment;
and the source base station receives first indication information sent by the core network equipment, wherein the first indication information is used for indicating that the UE is switched to the second target cell.
Optionally, the recovering, by the source base station, the priority of the neighboring cell of the first target cell includes:
the source base station receives second indication information sent by core network equipment, wherein the second indication information is used for indicating the recovery of the priority of the adjacent cell of the first target cell;
and the source base station adjusts the priority of the second target cell and the priorities of other cells in the adjacent cells to the position before cell switching through inter-station communication.
Optionally, the adjusting, by the source base station, the priority of the neighboring cell includes:
the source base station adjusts the priority of the second target cell to be the highest through inter-station communication;
and the source base station adjusts the priority of other cells in the adjacent cells to be the lowest through inter-station communication.
Optionally, the obtaining, by the source base station, signal quality information of a neighboring cell of the first target cell includes:
the source base station determines a target area by taking the position of the first target cell as an origin and a preset distance as a radius;
determining a cell in the target area as a candidate cell;
determining a distance between the UE and the candidate cell;
and when the distance between the UE and the candidate cell is smaller than a preset distance threshold, determining that the candidate cell is a neighboring cell of the first target cell.
In a second aspect, the present application provides an apparatus for cell handover, including:
the receiving module is used for receiving the information of the adjacent cell reported by the user equipment UE;
a determining module, configured to determine whether a neighboring cell of the UE includes a first target cell in a handover path, where the handover path includes information of multiple cells that the UE sequentially passes through, and the first target cell is a cell that the UE passes through next in the handover path;
a switching module, configured to control the UE to switch to the first target cell when the neighboring cell of the UE includes the first target cell;
an obtaining module, configured to obtain, when the first target cell is not included in a neighboring cell of the UE, signal quality information of a neighboring cell of the first target cell, where the neighboring cell of the first target cell does not belong to the handover path;
an adjusting module, configured to adjust a priority of a neighboring cell of the first target cell when it is determined to handover the UE to a second target cell of the neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell, where the adjusted priority of the second target cell is higher than priorities of other cells of the neighboring cells of the first target cell;
the switching module is further configured to control the UE to switch to the second target cell.
In a third aspect, the present invention provides an electronic device comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer executable instructions stored by the memory causes the at least one processor to perform the method according to any one of the first aspect and alternatives of the invention.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon computer executable instructions for implementing the method according to any one of the first and alternative aspects of the present invention when executed by a processor.
In a fifth aspect, the invention provides a computer program product comprising a computer program which, when executed by a processor, performs the method of any one of the first and alternative aspects of the invention.
According to the cell switching method and device, the source base station receives information of the neighboring cells reported by the UE, when a first target cell in a switching path fails, the source base station determines that the neighboring cells of the UE do not include the first target cell, the switching path includes information of a plurality of cells through which the UE sequentially passes, and the first target cell is a cell through which the UE passes next in the switching path. At this time, the source base station acquires the signal quality information of the adjacent cell of the first target cell, and selects a second target cell from the adjacent cell of the first target cell according to the signal quality of the adjacent cell of the first target cell to perform handover, so that when a cell in a handover path fails, the service of the UE is not interrupted or the communication quality is not reduced.
Drawings
FIG. 1 is a schematic diagram of an application scenario of the present application;
fig. 2 is a flowchart of a cell handover method provided in the present application;
fig. 3 is a flowchart of a cell handover method according to a second embodiment of the present application;
fig. 4 is a flowchart of a method for cell handover according to a third embodiment of the present application;
FIG. 5 is a diagram illustrating a scenario of cell handover;
fig. 6 is a schematic structural diagram of a cell handover apparatus according to a fourth embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
The application provides a cell switching method, which is suitable for cell switching in a high-speed mobile scene, wherein the high-speed mobile scene can be a scene in which a terminal device communicates under the condition of high-speed motion in traffic equipment such as road traffic, rail traffic and the like, and the communication includes but is not limited to: making a call, watching a video, watching a live broadcast, listening to music, sending a short message, etc. The terminal device referred to in the present application may be an electronic device such as a mobile phone and a tablet computer, and the terminal device is also referred to as a UE.
Fig. 1 is a schematic diagram of an application scenario of the present application, as shown in fig. 1, taking an example that a terminal device communicates on a high-speed train running at a high speed, when the high-speed train 1 runs on a high-speed rail 2, a terminal device 3 used by a user in the train 1 moves along with the train 1 on the rail 2, and may enjoy a communication service provided by an operator by connecting a base station provided by the operator beside the rail 2, the terminal device 3 is specifically connected to a cell within a coverage of the base station, and one or more cells may be within a coverage of one base station.
The base station to which the terminal device 3 is connected may be a base station of a private communication network that is set by an operator specifically for the terminal device 3 operating on the track 2, or may be a base station that is set by the operator at the side of the track 2 according to the operation requirement. Illustratively, when the train 1 moves between the intervals a-B on the track 2, the terminal device 3 is switched from the cell 41 to the cell 42, from the cell 42 to the cell 43, and from the cell 43 to the cell 44, which are provided by the operator, according to the coverage of the base stations passed by, so that the terminal device 30 can continue to communicate between the intervals a-B following the train 10 without interruption.
In a high-speed railway scene, because the track 2 and the base stations arranged around the track 2 are fixed, the route and the cell through which the terminal device 3 passes are fixed, and as the speed of a high-speed railway train is higher and higher, the terminal device 3 can be switched in the cell along the railway more frequently, and the time for switching the terminal device 3 is less and less. Based on the above features of the high-speed rail scenario, in order to improve the switching efficiency of the terminal device and reduce the communication interruption caused by the short switching preparation time of the terminal device during switching, the operator may send the information of the base station to be switched to the terminal device in advance to reduce the switching preparation time of the terminal device.
For example, when the terminal device 3 shown in fig. 1 follows the train 1 and will pass through the section a-B, the operator network may send information of the cells 41-44 in the section a-B to the terminal device 3 in advance, so that the terminal device 3 can directly use the information of the cell 42 provided by the operator to switch from the cell 41 to the cell 42 without excessive switching preparation work when passing through the coverage range where the cell 41 and the cell 42 are overlapped, thereby reducing the time for switching between the cells by the terminal device 3, ensuring that the terminal device 3 completes the switching of the cells when the speed of the train 1 is high, and ensuring that the communication of the terminal device 3 is not interrupted.
In some specific implementations, based on the information of the cells passing through within a certain interval, which is determined in advance by the operator and sent to the terminal device, the cells are arranged according to the traveling direction of the train 1 on the track 2, so that the terminal device performs switching according to the arranged switching sequence, which may also be referred to as a switching path or a switching chain.
When the terminal device 3 runs on the track 2 following the high-speed train 1, the switching path provided by the operator may be received in advance before passing through an interval, or the switching path in the interval may be stored in advance before passing through an interval, the terminal device 3 may perform cell switching according to the switching path, and a communication method in which the terminal device 3 performs switching using the switching path may be referred to as a "high-speed mode".
It should be noted that, in the scenario shown in fig. 1, a plurality of cells between the intervals a-B belong to a plurality of different base stations, and in an actual scenario, two adjacent cells may also belong to the same base station, which is not limited in this application.
In the prior art, the UE can only switch from the current cell to the next adjacent cell to be passed through according to the switching path, and if the wireless environment of the next adjacent cell is possibly poor or the next adjacent cell fails, the service interruption or communication quality of the UE may be caused, and the user requirement may not be met.
In order to solve the problems in the prior art, the present application provides a cell switching method, where a base station determines, by reporting signal quality information of a neighboring cell in time, whether the neighboring cell of the UE includes a cell through which the UE passes next in a switching path, and if the neighboring cell of the UE does not include the cell through which the UE passes next, obtains information of neighboring cells around the cell through which the UE passes next, and selects a cell with better quality from the neighboring cells around the cell through which the UE passes next for switching, which is equivalent to flexibly adjusting the switching path, and this way can avoid service interruption or communication quality degradation of the UE due to switching.
Fig. 2 is a flowchart of a cell handover method provided in the present application, and as shown in fig. 2, the method provided in this embodiment includes the following steps.
S101, a source base station receives information of a neighboring cell reported by UE.
The source base station refers to a base station where a current serving cell of the UE is located, and the current serving cell of the UE refers to a cell to which the UE is currently accessed or a cell providing service for the UE. The UE may perform cell neighbor measurement according to the configuration of the base station or the core network, and send signal quality information of the neighbor to the source base station in the form of a measurement report (measurement report).
The UE carries out measurement of the full frequency point on the communication frequency point, and obtains the identification or the number of the adjacent region and the signal quality information of the adjacent region, wherein the identification or the number of the adjacent region can uniquely identify one adjacent region, and the signal quality information of the adjacent region comprises received signal strength, received signal quality, signal to interference noise ratio (SINR for short), scrambling codes, background noise and the like. In a Long Term Evolution (LTE) network, the received signal strength may be Reference Signal Received Power (RSRP), and the received signal quality may be reference signal received power (RSRQ). The background noise is also called background noise (background noise).
The information of the neighboring cell reported by the UE includes an identifier of the neighboring cell, which is used to notify the base station of which neighboring cells the UE has, optionally, the information of the neighboring cell reported by the UE also includes signal quality information of the neighboring cell, and the signal quality information of the neighboring cell reported by the UE may include one or more of the above-mentioned signal quality information. There may be one or more adjacent cells of the UE, and the UE may report information of all the adjacent cells measured to the source base station.
S102, the source base station judges whether the adjacent cell of the UE comprises a first target cell in a switching path, wherein the first target cell is a cell through which the UE passes next in the switching path.
The switching path includes information of a plurality of cells through which the UE sequentially passes, where the switching path may be configured for the UE by a certain base station or core network equipment, and when the UE enters a coverage area of a certain base station, the base station issues the switching path to the UE, for example, when the UE gets on the train from a certain high-speed rail station, the base station to which the range of the high-speed rail station belongs is located to the UE, and the switching path is issued to the UE.
The handover path is used for the UE to perform cell handover, and the handover path includes a plurality of cells, and there is an order between the cells, i.e. a handover order, for example, the handover path may be denoted as "{ cell ID1, cell ID2, cell ID3, … …, cell ID n", and cell IDs 1-n denote cell identities. Then, in the process that the UE moves along with the train, the UE is switched from the cell corresponding to the cell ID1 to the cell corresponding to the cell ID2, then switched from the cell corresponding to the cell ID2 to the cell corresponding to the cell ID3, and so on until the UE is switched to the cell corresponding to the cell IDn. The switch path has a direction that is the same as the direction of train travel.
The first target cell is a cell through which the UE passes next in a switching path, the cell through which the UE passes next is an adjacent cell of a current service cell of the UE, in the switching path, except the first cell and the last cell, other cells have two adjacent cells as seen from the switching path, one is the cell through which the UE passes and the other is the cell through which the UE passes, and the other is the cell through which the UE passes.
The source base station acquires the identifier of the first target cell from the switching path, judges whether the identifier of the first target cell is the same as the identifier of a certain adjacent cell reported by the UE, determines that the adjacent cell of the UE comprises the first target cell if the identifier of the first target cell is the same as the identifier of the certain adjacent cell, and determines that the adjacent cell of the UE does not comprise the first target cell if the identifier of the first target cell is different from the identifiers of all adjacent cells of the UE. When the first target cell is included in the neighboring cell of the UE, step S103 is performed, and when the first target cell is not included in the neighboring cell of the UE, step S104 is performed.
In general, when the first target cell fails, the UE cannot detect the first target cell through the neighboring cell detection, that is, the neighboring cell of the UE does not include the first target cell.
S103, the source base station controls the UE to be switched to the first target cell.
When the neighboring cell of the UE includes the first target cell, the source base station may directly perform cell handover to handover the UE to the first target cell. In one scenario, although the UE detects the first target cell, the signal of the first target cell is poor, and if the UE is handed over to the first target cell, service interruption or quality degradation of the UE may be caused. Therefore, in an implementation manner, before the handover, the source base station further determines whether the first target cell meets the user service bearer requirement. And if the first target cell meets the user service bearing requirement, switching the UE to the first target cell, and if the first target cell does not meet the user service bearing requirement, returning to execute the step S101.
The source base station may determine whether the first target cell meets the user service bearer requirement according to the signal quality information of the first target cell, and may also send the signal quality of the first target cell to a core network device for making a cell handover decision, where the core network device may be, for example, a Mobility Management Entity (MME). And the core network equipment judges whether the first target cell meets the user service bearing requirement or not according to the signal quality information of the first target cell and indicates the judgment result to the source base station. If the core network device indicates that the first target cell meets the user service bearing requirement, the source base station performs cell switching, and if the core network device indicates that the first target cell does not meet the user service bearing requirement, the cell switching is not performed, and the step S101 is returned to be executed. The source base station and the core network device may determine whether the first target cell meets the user service bearer requirement in the same manner, or may determine whether the first target cell meets the user service bearer requirement in different manners.
S104, the source base station acquires the signal quality information of the adjacent cell of the first target cell, wherein the adjacent cell of the first target cell does not belong to the switching path.
The source base station can acquire cell identifiers and position information of other cells in the network, and can determine adjacent cells of the first target cell according to the position information of the first target cell and the position information of the other cells so as to acquire signal quality information of the adjacent cells.
For example, the source base station determines a target area with the position of the first target cell as an origin and the preset distance as a radius, and determines all cells in the target cell as neighboring cells of the first target cell. The preset distance is, for example, 300 meters or 500 meters.
In order to avoid switching to a cell that is too far away, when determining a neighboring cell of the first target cell, optionally, a cell in the target region is first determined as a candidate cell, and a distance between the UE and the candidate cell is further determined, and when the distance between the UE and the candidate cell is smaller than a preset distance threshold, the candidate cell is determined as the neighboring cell of the first target cell. And when the distance between the UE and the candidate cell is greater than or equal to the preset distance threshold, discarding the candidate cell. The preset distance threshold may be 1 km, and if there is a cell greater than 1 km away from the user in the target area, the cell is not selected as the neighboring cell of the first target cell.
S105, when the UE is switched to a second target cell in the adjacent cells of the first target cell according to the signal quality information of the adjacent cells of the first target cell, the source base station adjusts the priority of the adjacent cells of the first target cell.
In an exemplary manner, the source base station determines, according to signal quality information of neighboring cells of the first target cell, available cells that meet user service bearer requirements from the neighboring cells of the first target cell, and selects, as the second target cell, a cell with the best signal quality from the available cells that meet user service bearer requirements. The available cells meeting the user service bearing requirement may be one or more, when the number of the available cells is one, the available cells are determined as a second target cell, and when the number of the available cells is multiple, the cell with the best signal quality is selected from the multiple available cells as the second target cell.
In another exemplary manner, after obtaining signal quality information of an adjacent cell of a first target cell, a source base station sends the signal quality information of the adjacent cell to a core network device, the core network device determines an available cell meeting user service bearing requirements according to the signal quality information of the adjacent cell, selects a cell with the best signal quality from the available cells meeting the user service bearing requirements as a second target cell, and sends first indication information to the source base station, where the first indication information is used to indicate that a UE is to be switched to the second target cell, and the source base station receives the first indication information sent by the core network device and determines to switch the UE to the indicated second target cell according to the first indication information.
In this embodiment, the adjusted priority of the second target cell is higher than the priorities of other cells in the neighboring cells of the first target cell, each cell has a priority, when the UE performs cell handover, the UE preferentially selects to handover to the cell with the higher priority, and the UE is guaranteed to be able to handover to the second target cell by adjusting the priority of the second target cell to be higher than the priorities of the other neighboring cells.
In an alternative, the source base station adjusts the priority of the second target cell to be the highest through inter-station communication, and adjusts the priority of other cells in the adjacent cell to be the lowest through inter-station communication. The inter-station communication refers to a mode of direct communication between two base stations, the priority of a cell can be quickly adjusted through the inter-station communication, and the time for switching the cell is shortened.
In another alternative, the source base station adjusts the priority of the second target cell to be the same as the priority of the first target cell, and adjusts the priorities of other neighboring cells to be the lowest or remain unchanged.
In another alternative, the core network device adjusts the priorities of the second target cell and other neighboring cells of the first target cell, and the core network device sends priority adjustment instructions to the second target cell and other neighboring cells of the first target cell, respectively, where the specific adjustment manner is the same as that of the source base station, and is not described here again.
In this embodiment, the priority of the second target cell is adjusted to be the highest or adjusted to be the same as the priority of the first target cell, which is equivalent to updating the first target cell in the handover path to the second target cell, so as to ensure that the UE can be handed over to the second target cell.
According to the scheme in the prior art, no matter whether the first target cell fails or the signal quality is poor, the source base station switches the UE to the first target cell, so that service interruption or communication quality reduction of the UE is caused.
S106, the source base station controls the UE to be switched to the second target cell.
For the specific handover process, reference is made to the prior art, which is not described herein again, and after the UE accesses the second target cell, the handover procedure is ended.
In this embodiment, the source base station receives information of a neighboring cell reported by the UE, and when a first target cell in a handover path fails, the source base station determines that the neighboring cell of the UE does not include the first target cell, where the handover path includes information of multiple cells through which the UE sequentially passes, and the first target cell is a cell through which the UE passes next in the handover path. At this time, the source base station acquires the signal quality information of the adjacent cell of the first target cell, and selects a second target cell from the adjacent cell of the first target cell to perform handover according to the signal quality of the adjacent cell of the first target cell, so that when a cell in a handover path fails, the service of the UE is not interrupted or the communication quality is not reduced.
Based on the first embodiment, fig. 3 is a flowchart of a method for cell handover provided in a second embodiment of the present application, and as shown in fig. 3, the method provided in this embodiment includes the following steps.
S201, the source base station receives the information of the adjacent cell reported by the UE.
S202, the source base station determines that the adjacent cell of the UE comprises a first target cell in the switching path.
The switching path includes information of a plurality of cells through which the UE sequentially passes, and the first target cell is a cell through which the UE passes next in the switching path.
The specific implementation manner of steps S201 and S202 refers to the description of steps S101 and S102 in the first embodiment, and is not described herein again.
S203, the source base station judges whether the first target cell meets the user service bearing requirement.
And when the first target cell meets the user service bearing requirement, executing step S204, and when the first target cell does not meet the user service bearing requirement, returning to execute step S201.
Optionally, the signal quality information of the first target cell includes a number of measurement reports reported by the UE in a preset time period (for example, within 1 minute), a reception level of each measurement report, a signal-to-noise ratio of each measurement report, and a background noise of each measurement report, where the signal quality information is obtained by the UE by measuring the first target cell.
The source base station calculates a decision value according to the following formula:
wherein, Scr is the decision value, n is the number of measurement reports reported by the UE in a preset time period, Rs is the reception level of the measurement report, Sinr is the signal-to-noise ratio of the measurement report, and Rt is the background noise of the measurement report;
when the decision value is greater than the decision threshold, determining that the first target cell meets the user service bearing requirement, and when the decision value is less than or equal to the decision threshold, determining that the first target cell does not meet the user service bearing requirement.
It is understood that, this is only an example, and the source base station may also determine whether the first target cell meets the user service bearer requirement through other parameters or other manners.
Optionally, in an implementation manner, the source base station may also send the signal quality information of the first target cell to the core network device, and the core network device determines whether the first target cell meets the user service bearer requirement in the same manner as the source base station, and sends the determination result to the source base station.
And S204, the source base station controls the UE to be switched to the second target cell.
On the basis of the first embodiment, fig. 4 is a flowchart of a method for cell handover provided in the third embodiment of the present application, and as shown in fig. 4, the method provided in this embodiment includes the following steps.
S301, the source base station receives the information of the adjacent cell reported by the UE.
S302, the source base station determines that the adjacent cell of the UE comprises a first target cell in the switching path.
The switching path includes information of a plurality of cells through which the UE sequentially passes, and the first target cell is a cell through which the UE passes next in the switching path.
The specific implementation manner of steps S301 and S302 refers to the description of steps S101 and S102 in the first embodiment, and is not described herein again.
S303, the source base station determines the adjacent cell of the first target cell.
Illustratively, the source base station determines a target area by using the position of the first target cell as an origin and using a preset distance as a radius, determines a cell in the target area as a candidate cell, determines a distance between the UE and the candidate cell, and determines the candidate cell as a neighboring cell of the first target cell when the distance between the UE and the candidate cell is smaller than a preset distance threshold.
S304, the source base station acquires the signal quality information of the adjacent cell of the first target cell.
The cells can perform inter-station communication, and the source base station can request the neighboring cell of the first target cell to report the signal quality information, where the signal quality information of the neighboring cell of the first target cell includes the number of measurement reports reported by the neighboring cell in a preset time period, the reception level of each measurement report, the signal-to-noise ratio of each measurement report, the background noise of each measurement report, and the like.
S305, the source base station sends the signal quality information of the neighboring cell to the core network device.
S306, the source base station receives first indication information sent by the core network equipment, and the first indication information is used for indicating that the UE is switched to a second target cell.
In this embodiment, the core network device determines, according to the signal quality information of the neighboring cells of the first target cell, available cells that meet the user service bearer requirement from the neighboring cells of the first target cell, and selects, as the second target cell, a cell with the best signal quality from the available cells that meet the user service bearer requirement.
Illustratively, the determining, by the core network device, an available cell that meets the user service bearer requirement from the neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell may be: the core network device calculates a decision value according to the following formula:
wherein, Scr is a decision value, n is the number of measurement reports reported by the neighboring cell in a preset time period, Rs is a receiving level of the measurement report, Sinr is a signal-to-noise ratio of the measurement report, and Rt is a background noise of the measurement report, when the decision value is greater than a decision threshold, the core network device determines that the neighboring cell meets a user service bearing requirement.
Optionally, the source base station may also determine the second target cell according to the signal quality information of the neighboring cell of the first target cell, where the specific determination mode refers to the determination mode of the core network device, and details are not described here.
S307, the source base station adjusts the priority of the second target cell to be the highest through inter-station communication, and adjusts the priorities of other adjacent cells of the first target cell to be the lowest.
Fig. 5 is a schematic view of a scenario of cell handover, as shown in fig. 5, a base station a is a base station corresponding to a current serving cell of a UE, a train is in a process of track-delayed operation, a next passing cell is a cell corresponding to a base station C, when the base station C fails, the UE cannot be handed over to the base station C, thereby causing communication interruption, and when the base station C fails, the UE cannot detect a cell corresponding to the base station C through neighbor cell detection, the base station a determines that the cell corresponding to the base station C is not in the neighbor cell of the UE according to information of the neighbor cell reported by the UE, at this time, the base station a determines that the neighbor cell of the cell corresponding to the base station C, in the scenario shown in fig. 5, the cell corresponding to the base station C only has one neighbor cell, that is the cell corresponding to the base station B, the base station a detects whether the cell corresponding to the base station B meets a requirement, and if the requirement is met, the UE is determined to be handed over to the cell corresponding to the base station B, and the priority of the cell corresponding to the base station B is adjusted to be the highest. In this scenario, when the base station C fails in the handover path, the handover to the neighboring base station of the base station C having a better wireless communication environment can be performed, thereby ensuring that the service of the UE is not interrupted.
S308, the source base station controls the UE to be switched to the second target cell.
S309, after the UE is successfully accessed to the second target cell, the source base station restores the priority of the adjacent cell of the first target cell.
In one mode, a source base station receives second indication information sent by core network equipment, where the second indication information is used to indicate that the priority of an adjacent cell of a first target cell is restored, and the source base station adjusts the priority of a second target cell and the priorities of other cells in the adjacent cell through inter-station communication until the cell is switched.
In another mode, after determining that the UE successfully accesses the second target cell, the source base station actively adjusts the priority of the second target cell and the priorities of other cells in the neighboring cells through inter-station communication before cell handover.
Fig. 6 is a schematic structural diagram of a cell handover apparatus according to a fourth embodiment of the present invention, and as shown in fig. 6, a handover apparatus 100 according to the present embodiment includes:
a receiving module 11, configured to receive information of a neighboring cell reported by user equipment UE;
a determining module 12, configured to determine whether a neighboring cell of the UE includes a first target cell in a handover path, where the handover path includes information of multiple cells that the UE sequentially passes through, and the first target cell is a cell that the UE passes through next in the handover path;
a switching module 13, configured to control the UE to switch to the first target cell when the neighboring cell of the UE includes the first target cell;
an obtaining module 14, configured to obtain, when the first target cell is not included in a neighboring cell of the UE, signal quality information of a neighboring cell of the first target cell, where the neighboring cell of the first target cell does not belong to the handover path;
an adjusting module 15, configured to, when it is determined to handover the UE to a second target cell among the neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell, adjust a priority of the neighboring cell of the first target cell, where the adjusted priority of the second target cell is higher than priorities of other cells in the neighboring cells of the first target cell;
the switching module 13 is further configured to control the UE to switch to the second target cell.
Optionally, the adjusting module 15 is further configured to: and after the UE is successfully accessed to the second target cell, restoring the priority of the adjacent cell of the first target cell.
Optionally, the first target cell and/or the second target cell both meet a user service bearer requirement.
Optionally, the switching module 13 is specifically configured to: when the adjacent cell of the UE comprises the first target cell, judging whether the first target cell meets the user service bearing requirement or not according to the signal quality information of the first target cell; and when the first target cell meets the user service bearing requirement, controlling the UE to be switched to the first target cell.
Optionally, the method further includes a determining module, configured to: determining an available cell meeting user service bearing requirements from the adjacent cells of the first target cell according to the signal quality information of the adjacent cells of the first target cell; and selecting the cell with the best signal quality from the available cells meeting the user service bearing requirements as the second target cell.
Optionally, the signal quality information of the neighboring cell of the first target cell includes the number of measurement reports reported by the neighboring cell in a preset time period, a reception level of each measurement report, a signal-to-noise ratio of each measurement report, and a background noise of each measurement report; the determining, according to the signal quality information of the neighboring cell of the first target cell, an available cell that meets a user service bearer requirement from the neighboring cells of the first target cell specifically includes:
the decision value is calculated according to the following formula:
wherein, Scr is the decision value, n is the number of measurement reports reported by the neighboring cell in a preset time period, Rs is the receiving level of the measurement report, Sinr is the signal-to-noise ratio of the measurement report, and Rt is the background noise of the measurement report;
and when the decision value is larger than a decision threshold, determining that the adjacent cell meets the user service bearing requirement.
Optionally, the system further includes a sending module, configured to send the signal quality information of the neighboring cell to a core network device; the receiving module 11 is further configured to: and receiving first indication information sent by the core network equipment, wherein the first indication information is used for indicating that the UE is switched to the second target cell.
Optionally, the adjusting module 15 is specifically configured to: receiving second indication information sent by core network equipment, wherein the second indication information is used for indicating the recovery of the priority of the adjacent cell of the first target cell; and adjusting the priority of the second target cell and the priorities of other cells in the adjacent cells to the cell before switching through inter-station communication.
Optionally, the adjusting module 15 is specifically configured to include: and adjusting the priority of the second target cell to be highest through inter-station communication, and adjusting the priority of other cells in the adjacent cells to be lowest through inter-station communication.
Optionally, the obtaining module 14 is specifically configured to:
determining a target area by taking the position of the first target cell as an origin and a preset distance as a radius;
determining a cell in the target area as a candidate cell;
determining a distance between the UE and the candidate cell;
and when the distance between the UE and the candidate cell is smaller than a preset distance threshold, determining that the candidate cell is a neighboring cell of the first target cell.
The apparatus of this embodiment may be configured to perform the method according to any one of the first to third embodiments, and the specific implementation manner and the technical effect are similar, which are not described herein again.
Fig. 7 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present application, and as shown in fig. 7, the electronic device 200 includes: the processor 21 is configured to execute the instructions stored in the memory, so that the electronic device 200 executes the method steps according to any one of the first to third embodiments, where the specific implementation manner and the technical effect are similar, and details are not repeated here.
A sixth embodiment of the present application provides a computer-readable storage medium, where a computer-executable instruction is stored in the computer-readable storage medium, and the computer-executable instruction is used by a processor to implement the method steps according to any one of the first to third embodiments, where specific implementation manners and technical effects are similar, and are not described herein again.
A seventh embodiment of the present application provides a computer program product, including a computer program, where the computer program, when executed by a processor, implements the method steps described in any of the first to third embodiments, and specific implementation and technical effects are similar, and are not described herein again.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (14)
1. A method for cell handover, comprising:
a source base station receives information of a neighboring cell reported by User Equipment (UE);
the source base station judges whether the adjacent cell of the UE comprises a first target cell in a switching path, wherein the switching path comprises information of a plurality of cells which are sequentially passed by the UE, and the first target cell is a cell which is passed by the UE next in the switching path;
when the adjacent cell of the UE comprises the first target cell, the source base station controls the UE to be switched to the first target cell;
when the neighboring cell of the UE does not include the first target cell, the source base station acquires signal quality information of a neighboring cell of the first target cell, wherein the neighboring cell of the first target cell does not belong to the handover path;
when the UE is determined to be switched to a second target cell in the adjacent cells of the first target cell according to the signal quality information of the adjacent cells of the first target cell, the source base station adjusts the priority of the adjacent cell of the first target cell, wherein the adjusted priority of the second target cell is higher than the priority of other cells in the adjacent cells of the first target cell;
and the source base station controls the UE to be switched to the second target cell.
2. The method of claim 1, further comprising:
and after the UE is successfully accessed to the second target cell, the source base station restores the priority of the adjacent cell of the first target cell.
3. The method according to claim 1 or 2, wherein the first target cell and/or the second target cell both meet user traffic bearer requirements.
4. The method of claim 3, wherein when the first target cell is included in the neighboring cell of the UE, the controlling, by the source base station, the UE to be handed over to the first target cell comprises:
when the adjacent cell of the UE comprises the first target cell, the source base station judges whether the first target cell meets the user service bearing requirement or not according to the signal quality information of the first target cell;
and when the first target cell meets the user service bearing requirement, the source base station controls the UE to be switched to the first target cell.
5. The method of claim 3, wherein after the source base station acquires the signal quality information of the neighboring cells of the first target cell, the method further comprises:
the source base station determines an available cell meeting user service bearing requirements from the adjacent cells of the first target cell according to the signal quality information of the adjacent cells of the first target cell;
and the source base station selects a cell with the best signal quality from available cells meeting the user service bearing requirement as the second target cell.
6. The method of claim 5, wherein the signal quality information of the neighbor cells of the first target cell includes a number of measurement reports reported by the neighbor cells in a preset time period, a reception level of each measurement report, a signal-to-noise ratio of each measurement report, and a background noise of each measurement report;
the method for determining the available cell meeting the user service bearing requirement from the adjacent cells of the first target cell by the source base station according to the signal quality information of the adjacent cells of the first target cell comprises the following steps:
the source base station calculates a decision value according to the following formula:
wherein, Scr is the decision value, n is the number of measurement reports reported by the neighboring cell in a preset time period, Rs is the receiving level of the measurement report, Sinr is the signal-to-noise ratio of the measurement report, and Rt is the background noise of the measurement report;
and when the judgment value is larger than a judgment threshold, determining that the adjacent cell meets the user service bearing requirement.
7. The method of claim 3, wherein after the source base station acquires the signal quality information of the neighboring cells of the first target cell, the method further comprises:
the source base station sends the signal quality information of the adjacent cells to core network equipment;
and the source base station receives first indication information sent by the core network equipment, wherein the first indication information is used for indicating that the UE is switched to the second target cell.
8. The method of claim 2, wherein the source base station restoring the priority of the neighboring cells of the first target cell comprises:
the source base station receives second indication information sent by core network equipment, wherein the second indication information is used for indicating the recovery of the priority of the adjacent cell of the first target cell;
and the source base station adjusts the priority of the second target cell and the priorities of other cells in the adjacent cells to the position before cell switching through inter-station communication.
9. The method of claim 1, wherein the source base station adjusting the priority of the neighboring cell comprises:
the source base station adjusts the priority of the second target cell to be the highest through inter-station communication;
and the source base station adjusts the priority of other cells in the adjacent cells to be the lowest through inter-station communication.
10. The method of claim 9, wherein the obtaining, by the source base station, signal quality information of neighboring cells of the first target cell comprises:
the source base station determines a target area by taking the position of the first target cell as an origin and a preset distance as a radius;
determining a cell in the target area as a candidate cell;
determining a distance between the UE and the candidate cell;
and when the distance between the UE and the candidate cell is smaller than a preset distance threshold, determining that the candidate cell is a neighboring cell of the first target cell.
11. An apparatus for cell handover, comprising:
the receiving module is used for receiving the information of the adjacent cell reported by the user equipment UE;
a determining module, configured to determine whether a neighboring cell of the UE includes a first target cell in a handover path, where the handover path includes information of multiple cells that the UE sequentially passes through, and the first target cell is a cell that the UE passes through next in the handover path;
a switching module, configured to control the UE to switch to the first target cell when the neighboring cell of the UE includes the first target cell;
an obtaining module, configured to obtain, when the first target cell is not included in a neighboring cell of the UE, signal quality information of a neighboring cell of the first target cell, where the neighboring cell of the first target cell does not belong to the handover path;
an adjusting module, configured to adjust a priority of a neighboring cell of the first target cell when it is determined to handover the UE to a second target cell of the neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell, where the adjusted priority of the second target cell is higher than priorities of other cells of the neighboring cells of the first target cell;
the switching module is further configured to control the UE to switch to the second target cell.
12. An electronic device, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of any of claims 1 to 10.
13. A computer-readable storage medium having computer-executable instructions stored thereon, which when executed by a processor, are configured to implement the method of any one of claims 1 to 10.
14. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the method of any one of claims 1 to 10.
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