CN115002845B - Method and device for cell switching - Google Patents
Method and device for cell switching Download PDFInfo
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- CN115002845B CN115002845B CN202110224404.9A CN202110224404A CN115002845B CN 115002845 B CN115002845 B CN 115002845B CN 202110224404 A CN202110224404 A CN 202110224404A CN 115002845 B CN115002845 B CN 115002845B
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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
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Abstract
The application provides a method and a device for cell switching, a source base station receives information of neighbor cells reported by UE, when a first target cell in a switching path fails, the source base station determines that the neighbor cells of the UE do not comprise the first target cell, the switching path comprises information of a plurality of cells which the UE sequentially passes through, and the first target cell is a cell which the UE next passes through in the switching path. At this time, the source base station acquires signal quality information of the neighboring cells of the first target cell, and selects a second target cell from the neighboring cells of the first target cell to switch according to the signal quality of the neighboring cells of the first target cell, so that it can be ensured that the service of the UE is not interrupted or the communication quality is not reduced when the cell in the switching path fails.
Description
Technical Field
The present application relates to the field of communications, and more particularly, to a method and apparatus for cell handover.
Background
When a User Equipment (UE) performs mobile communication, in order to ensure communication quality, it is necessary to switch to a cell with better service quality through the cell. The base station side is configured with a neighbor cell list, and when the 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 a low-speed moving scene with the speed per hour lower than 130 km/h, and in a high-speed moving scene such as a high-speed rail, the moving speed of the UE is very high, and the wireless environment in which the UE is positioned is also changed rapidly. If the existing switching flow is still adopted, the problem of untimely switching caused by too fast movement of the UE can occur, in order to solve the problem of untimely switching of the UE, the network side configures a switching path for the UE, the switching path comprises a plurality of cells which are ordered according to the requirement, and the UE sequentially switches 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 neighbor cell to be passed through according to the switching path, if the wireless environment of the next neighbor cell may be poor, or the next neighbor cell fails, the service of the UE is interrupted or the communication quality is reduced, and the user requirements cannot 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:
The source base station receives information of a neighbor cell reported by User Equipment (UE);
the source base station judges whether a neighboring 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 the UE sequentially passes through, and the first target cell is a cell which the UE next passes through in the switching path;
when the neighbor 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 neighbor cell of the UE does not comprise the first target cell, the source base station acquires signal quality information of the neighbor cell of the first target cell, wherein the neighbor cell of the first target cell does not belong to the switching path;
when determining to switch the UE to a second target cell in the neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell, the source base station adjusts the priority of the neighboring cells of the first target cell, wherein the priority of the second target cell after adjustment is higher than the priority of other cells in the neighboring 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 comprises: 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.
Optionally, the first target cell and/or the second target cell both meet the user service bearer requirement.
Optionally, when the neighboring cell of the UE includes the first target cell, the source base station controls the UE to switch to the first target cell, including:
when the neighbor 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 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 obtains the signal quality information of the neighboring cell of the first target cell, the method further includes:
the source base station determines available cells meeting the 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.
Optionally, the signal quality information of the neighboring cells of the first target cell includes the number of measurement reports reported by the neighboring cells in a preset time period, a receiving level of each measurement report, a signal-to-noise ratio of each measurement report, and background noise of each measurement report;
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 comprises:
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 adjacent cells 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 the judgment 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 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 the UE to be switched to the second target cell.
Optionally, the source base station recovers the priority of the neighboring cell of the first target cell, including:
the source base station receives second indication information sent by core network equipment, wherein the second indication information is used for indicating the priority of a neighboring cell recovering the first target cell;
and the source base station adjusts the priority of the second target cell and the priority of other cells in the adjacent cells to before cell switching through inter-station communication.
Optionally, the source base station adjusts the priority of the neighboring cell, including:
the source base station adjusts the priority of the second target cell to be the highest through inter-station communication;
the source base station adjusts the priority of other cells in the adjacent cells to the lowest through inter-station communication.
Optionally, the source base station acquires signal quality information of a neighboring cell of the first target cell, including:
the source base station determines a target area by taking the position of the first target cell as an origin and taking a preset distance as a radius;
Determining cells in the target area as candidate cells;
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 value, determining the candidate cell as the adjacent 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 neighbor cell reported by the User Equipment (UE);
the judging module is used for judging whether the neighboring 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 the UE sequentially passes through, and the first target cell is a cell which the UE passes through next in the switching 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 signal quality information of a neighboring cell of the first target cell when the neighboring cell of the UE does not include 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 determining to switch the UE to a second target cell of the neighboring cells of the first target cell according to signal quality information of the neighboring cells of the first target cell, where the adjusted priority of the second target cell is higher than a priority of other cells of the neighboring cells of the first target cell;
And the switching module is also used for controlling the UE to be switched to the second target cell.
In a third aspect, the present application provides an electronic device comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the method according to any one of the first aspect and the optional manner of the application.
In a fourth aspect, the present application provides a computer-readable storage medium having stored therein computer-executable instructions for performing the method according to any of the first aspect and optional aspects of the application when executed by a processor.
In a fifth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements a method according to any of the first aspect and optional aspects of the application.
The method and the device for cell switching provided by the application have the advantages that the source base station receives the information of the neighbor cells reported by the UE, when a first target cell in a switching path fails, the source base station determines that the neighbor cells of the UE do not comprise the first target cell, the switching path comprises the information of a plurality of cells which the UE sequentially passes through, and the first target cell is the next cell which the UE passes through in the switching path. At this time, the source base station acquires signal quality information of the neighboring cells of the first target cell, and selects a second target cell from the neighboring cells of the first target cell to switch according to the signal quality of the neighboring cells of the first target cell, so that it can be ensured that the service of the UE is not interrupted or the communication quality is not reduced when the cell in the switching path fails.
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 method for cell handover 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 schematic diagram of a scenario of cell handover;
fig. 6 is a schematic structural diagram of a cell switching apparatus according to a fourth embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present application.
Detailed Description
The technical scheme of the application will be described below with reference to the accompanying drawings.
The application provides a cell switching method, which is suitable for cell switching under a high-speed moving scene, wherein the high-speed moving scene can be a scene that terminal equipment performs communication under the condition of high-speed movement in traffic equipment such as road traffic, rail traffic and the like, and the communication comprises but is not limited to: making a call, watching a video, watching live broadcast, listening to music, sending a short message, and the like. The terminal device in the application can be electronic devices such as a mobile phone, a tablet computer and the like, and the terminal device is also called UE.
Fig. 1 is a schematic diagram of an application scenario of the present application, as shown in fig. 1, taking a case that a terminal device communicates on a high-speed train running at a high speed as an example, 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 can 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 with a cell within a coverage area of the base station, and one or more cells may be provided within the coverage area of the base station.
The base station to which the terminal device 3 is connected may be a base station of a communication private network that is specifically set by the operator for the terminal device 3 running on the track 2, or may be a base station that is set by the operator beside the track 2 according to the operation requirement. Illustratively, as the train 1 moves between intervals a-B on the track 2, the terminal device 3 will be switched from cell 41 to cell 42, from cell 42 to cell 43, from cell 43 to cell 44, provided by the operator in turn, according to the different coverage of the base stations passed, so that the terminal device 30 can continue to communicate between intervals a-B following the train 10 without interruption.
In a high-speed rail scenario, since 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, as the speed of the high-speed rail train increases, the terminal device 3 will switch more frequently in the cell along the railway, and the time left for the terminal device 3 to switch decreases. Based on the above characteristics 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 shorter switching preparation time of the terminal device during switching, an operator can send 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 follows the train 1 and passes through the interval a-B as shown in fig. 1, the operator network may send the information of the cells 41-44 in the interval a-B to the terminal device 3 in advance, so that when the terminal device 3 passes through the coverage area where the cells 41 and 42 overlap, the information of the cell 42 provided by the operator may be directly used to switch from the cell 41 to the cell 42 without excessive switching preparation work, thereby reducing the switching time of the terminal device 3 between the cells, and 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, the cells are arranged according to the travelling direction of the train 1 on the track 2 based on the information of the cells passing through a certain interval determined in advance by the operator and sent to the terminal device, so that the terminal device performs a handover according to the arranged handover sequence, which may also be referred to as a handover path or a handover chain.
The terminal device 3 may receive the handover path provided by the operator in advance before passing through one section or store the handover path in one section in advance before passing through the one section when the high-speed train 1 is running on the track 2, and the terminal device 3 may perform cell handover according to the handover path, and a communication mode in which the terminal device 3 performs handover using the handover path may be referred to as "Gao Tiemo".
It should be noted that, in the scenario shown in fig. 1, the multiple cells between the intervals a-B belong to multiple different base stations, and in the actual scenario, two adjacent cells may also belong to the same base station, which is not limited by the present application.
In the prior art, the UE can only switch from the current cell to the next neighbor cell to be passed according to the switching path, if the wireless environment of the next neighbor cell may be poor, or the next neighbor cell fails, the service interruption or the communication quality degradation of the UE may be caused, and the user requirements cannot be satisfied.
In order to solve the problems in the prior art, the present application provides a cell switching method, in which a UE timely reports signal quality information of a neighboring cell, and a base station determines whether the neighboring cell of the UE includes a cell that the UE next passes through in a switching path, and if the neighboring cell of the UE does not include the cell that the UE next passes through, information of neighboring cells around the cell that the UE next passes through is obtained, and a cell with better quality is selected from neighboring cells around the cell that the UE next passes through to switch, which is equivalent to flexibly adjusting the switching path.
Fig. 2 is a flowchart of a cell handover method according to the present application, and as shown in fig. 2, the method according to the present embodiment includes the following steps.
S101, a source base station receives information of a neighbor 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 currently accessed by the UE or a cell serving the UE. The UE may perform cell neighbor measurements according to the configuration of the base station or the core network and send signal quality information of the neighbor cells to the source base station in the form of measurement reports (measurement report).
The UE performs measurement of the full frequency point on the communication frequency point, acquires the identification or the number of the adjacent cell and the signal quality information of the adjacent cell, wherein the identification or the number of the adjacent cell can uniquely identify one adjacent cell, and the signal quality information of the adjacent cell comprises received signal strength, received signal quality, signal to noise ratio (signal to interference noise ratio, SINR for short), scrambling code, noise floor and the like. In a long term evolution (Long Term Evolution, LTE) network, the received signal strength may be reference signal received power (reference signal receiving power, RSRP) and the received signal quality may be reference signal received power (reference signal receiving quality, RSRQ). Background noise is also known as background noise (background noise).
The information of the neighbor cells reported by the UE includes the identifier of the neighbor cell, which is used for notifying the base station UE of which neighbor cells the UE has, and optionally, the information of the neighbor cells reported by the UE also includes signal quality information of the neighbor cells, and the signal quality information of the neighbor cells reported by the UE may include one or more of the above mentioned signal quality information. One or more neighboring cells of the UE may exist, and the UE may report information of all neighboring cells measured to the source base station.
S102, the source base station judges whether the neighboring cell of the UE comprises a first target cell in a switching path, wherein the first target cell is a cell which the UE next passes through in the switching path.
The switching path includes information of a plurality of cells through which the UE sequentially passes, and the switching path may be configured by a certain base station or a core network device to the UE, 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, after the UE gets on a train from a certain high-speed rail station, a base station to which the range of the high-speed rail station belongs is located to the UE, and issues the switching path to the UE.
The handover path is used for cell handover of the UE, and the handover path includes a plurality of cells, the cells have an order, and the order of the cells is that of the handover, for example, the handover path may be represented as "{ cell ID1, cell ID2, cell ID3, … …, cell ID n", and cell IDs 1-n represent identities of the cells. Then, in the process of following the train movement, the UE firstly switches from the cell corresponding to the cell ID1 to the cell corresponding to the cell ID2, then switches from the cell corresponding to the cell ID2 to the cell corresponding to the cell ID3, and so on until switching to the cell corresponding to the cell IDn. The switching path has a direction that is the same as the direction of travel of the train.
The first target cell is a cell which is passed by the next cell of the UE in a switching path, the next cell of the UE is a neighboring cell of a current serving cell of the UE, in the switching path, other cells are two neighboring cells except the first cell and the last cell from the view of the switching path, one is the cell which the UE has passed by, and the other is the cell which the UE is about to pass by, and the current serving cell is only the neighboring cell, namely the cell which the UE passes by next due to the switching sequence.
The source base station acquires the identification of a first target cell from the switching path, judges whether the identification of the first target cell is the same as the identification of a certain neighbor cell reported by the UE, determines that the neighbor cell of the UE comprises the first target cell if the identification of the first target cell is the same as the identification of the certain neighbor cell, and determines that the neighbor cell of the UE does not comprise the first target cell if the identification of the first target cell is different from the identifications of all neighbor cells of the UE. Step S103 is performed when the first target cell is included in the neighbor cell of the UE, and step S104 is performed when the first target cell is not included in the neighbor cell of the UE.
In general, when the first target cell fails, the UE cannot detect the first target cell through neighbor cell detection, that is, the first target cell is not included in the neighbor cell of the UE.
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, the UE detects the first target cell, but the signal of the first target cell is poor, and at this time, if the UE is handed over to the first target cell, it may cause service interruption or quality degradation of the UE. Therefore, in one implementation, before the source base station performs handover, it is further determined whether the first target cell meets the user service bearer requirement. If the first target cell meets the user service bearer requirement, the UE is switched to the first target cell, and if the first target cell does not meet the user service bearer requirement, the step S101 is executed again.
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, or may 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 (Mobility Management Entity, abbreviated MME). And the core network equipment judges whether the first target cell meets the user service bearing requirement according to the signal quality information of the first target cell, and indicates the judging result to the source base station. If the core network equipment indicates that the first target cell meets the user service bearing requirement, the source base station performs cell switching, and if the core network equipment 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 executed. The source base station and the core network device can judge whether the first target cell meets the user service bearing requirement in the same mode, or can judge whether the first target cell meets the user service bearing requirement in different modes.
S104, the source base station acquires signal quality information of the adjacent cells of the first target cell, wherein the adjacent cells of the first target cell do not belong to a 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.
In an exemplary embodiment, the source base station determines a target area with a location of the first target cell as an origin and a 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, etc.
In order to avoid switching to the excessively far cell, when determining the neighboring cell of the first target cell, optionally, the cell in the target area is determined to be a candidate cell, the 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 to be the neighboring cell of the first target cell. And discarding the candidate cell when the distance between the UE and the candidate cell is greater than or equal to the preset distance threshold. The preset distance threshold may be 1 km, and if a cell greater than 1 km from the user exists in the target area, the cell is not selected as a neighboring cell of the first target cell.
S105, when determining to switch the UE to the second target cell in the neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell, the source base station adjusts the priority of the neighboring cells of the first target cell.
In an exemplary manner, the source base station determines an available cell meeting the user service bearer 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 selects a cell with the best signal quality from the available cells meeting the user service bearer requirement as the second target cell. The available cells meeting the service bearing requirements of the user can be one or more, when the number of the available cells is one, the available cells are determined to be the second target cells, and when the number of the available cells is a plurality of the available cells, the cell with the best signal quality is selected from the available cells to be the second target cells.
In another exemplary manner, after acquiring signal quality information of a neighboring cell of a first target cell, a source base station sends the signal quality information of the neighboring cell to a core network device, the core network device determines an available cell meeting a user service bearer requirement according to the signal quality information of the neighboring cell, selects a cell with the best signal quality from the available cells meeting the user service bearer requirement as a second target cell, and sends first indication information to the source base station, where the first indication information is used for indicating that a UE is switched to the second target cell, and the source base station receives the first indication information sent by the core network device and determines that the UE is switched 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, and when the UE performs cell switching, the UE preferentially selects to switch to the cell with the higher priority, and by adjusting the priority of the second target cell to be higher than the priorities of other neighboring cells, it is ensured that the UE can switch to the second target cell.
In an alternative way, the source base station adjusts the priority of the second target cell to the highest through inter-station communication, and adjusts the priority of other cells in the neighboring cells to the lowest through inter-station communication. Inter-station communication refers to a mode of direct communication between two base stations, and the priority of a cell can be quickly adjusted through inter-station communication, so that the time of cell switching 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 to remain unchanged.
In yet another alternative manner, the core network device adjusts 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 details are not repeated here.
In this embodiment, the priority of the second target cell is adjusted to be the highest or the same as the priority of the first target cell, which is equivalent to updating the first target cell in the handover path to be 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, whether the first target cell is faulty or the signal quality is poor or not, the source base station switches the UE to the first target cell, so that service interruption or communication quality of the UE is caused to be reduced.
S106, the source base station controls the UE to be switched to the second target cell.
The specific handover process refers to the prior art, and will not be described herein again, and after the UE accesses the second target cell, the handover process ends.
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 a plurality of cells that the UE sequentially passes through, and the first target cell is a cell that the UE next passes through in the handover path. At this time, the source base station acquires signal quality information of the neighboring cells of the first target cell, and selects a second target cell from the neighboring cells of the first target cell to switch according to the signal quality of the neighboring cells of the first target cell, so that it can be ensured that the service of the UE is not interrupted or the communication quality is not reduced when the cell in the switching path fails.
On the basis of the first embodiment, fig. 3 is a flowchart of a method for cell handover according to the second embodiment of the present application, and as shown in fig. 3, the method provided in the present embodiment includes the following steps.
S201, the source base station receives information of neighbor cells reported by the UE.
S202, the source base station determines that the neighboring cell of the UE comprises a first target cell in a switching path.
The switching path comprises information of a plurality of cells which the UE sequentially passes through, and the first target cell is a cell which the UE next passes through in the switching path.
The specific implementation manner of steps S201 and S202 refers to the descriptions of steps S101 and 102 in the first embodiment, and will not be repeated here.
S203, the source base station judges whether the first target cell meets the user service bearing requirement.
When the first target cell meets the user service bearer requirement, step S204 is executed, and when the first target cell does not meet the user service bearer requirement, step S201 is executed.
Optionally, the signal quality information of the first target cell includes the number of measurement reports reported by the UE in a preset 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 measuring the first target cell by the UE.
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 judgment value is larger than the judgment threshold, determining that the first target cell meets the user service bearing requirement, and when the judgment value is smaller than or equal to the judgment threshold, determining that the first target cell does not meet the user service bearing requirement.
It will be appreciated that the source base station may also determine whether the first target cell meets the user traffic bearer requirements by other parameters or by other means, by way of example only.
Optionally, in an implementation manner, the source base station may also send signal quality information of the first target cell to the core network device, where the core network device determines, in the same manner as the source base station, whether the first target cell meets the user service bearer requirement, and sends the determination result to the source base station.
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 according to the third embodiment of the present application, and as shown in fig. 4, the method provided in the present embodiment includes the following steps.
S301, the source base station receives information of neighbor cells reported by the UE.
S302, the source base station determines that the neighboring cell of the UE comprises a first target cell in a switching path.
The switching path comprises information of a plurality of cells which the UE sequentially passes through, and the first target cell is a cell which the UE next passes through in the switching path.
The specific implementation manner of steps S301 and S302 refers to the descriptions of steps S101 and 102 in the first embodiment, and will not be repeated here.
S303, the source base station determines adjacent cells of the first target cell.
The source base station determines a target area by taking a position of a first target cell as an origin and a preset distance as a radius, determines cells in the target area as candidate cells, determines a distance between the UE and the candidate cells, and determines the candidate cells as neighboring cells of the first target cell when the distance between the UE and the candidate cells is smaller than a preset distance threshold.
S304, the source base station acquires signal quality information of adjacent cells of the first target cell.
Inter-cell communication can be performed between cells, and the source base station can request the adjacent cells of the first target cell to report signal quality information, wherein the signal quality information of the adjacent cells of the first target cell comprises the number of measurement reports reported by the adjacent cells in a preset time period, the receiving level of each measurement report, the signal-to-noise ratio of each measurement report, the background noise of each measurement report and the like.
And S305, the source base station transmits the signal quality information of the adjacent cells to the core network equipment.
S306, the source base station receives first indication information sent by the core network equipment, wherein the first indication information is used for indicating the UE to be switched to a second target cell.
In this embodiment, according to the signal quality information of the neighboring cells of the first target cell, the core network device determines an available cell satisfying the user service bearer requirement from among the neighboring cells of the first target cell, and selects a cell with the best signal quality from the available cells satisfying the user service bearer requirement as the second target cell.
The core network device determines, from the neighboring cells of the first target cell, an available cell satisfying the user service bearer requirement according to the signal quality information of the neighboring cells of the first target cell, which 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 cells 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, rt is the background noise of the measurement report, and when the decision value is greater than a decision threshold, the core network device determines that the neighboring cells meet the user service load demand.
Optionally, the source base station may determine the second target cell according to the signal quality information of the neighboring cell of the first target cell, and the specific determining manner refers to the determining manner of the core network device, which is not described herein again.
S307, the source base station adjusts the priority of the second target cell to the highest through inter-station communication, and adjusts the priorities of other adjacent cells of the first target cell to the lowest.
Fig. 5 is a schematic diagram of a scenario of cell switching, as shown in fig. 5, where a base station a is a base station corresponding to a current serving cell of a UE, in a process of running a train along a track, a next passing cell is a cell corresponding to a base station C, when the base station C fails, the UE cannot switch to the base station C, so that communication is interrupted, and when the base station C fails, the UE cannot detect a cell corresponding to the base station C through neighbor cell detection, and the base station a determines that the cell corresponding to the base station C is not in a 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 is only one neighbor cell, that is, in the scenario shown in fig. 5, the cell corresponding to the base station C is the cell corresponding to the base station B, and if the cell corresponding to the base station B meets a requirement, the UE is determined to switch 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 the scene, when the base station C in the switching path fails, the base station C can be switched to an adjacent base station with good wireless communication environment, so that the service of the UE is ensured not to be 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, the source base station receives second indication information sent by the core network device, where the second indication information is used to indicate the priority of the neighboring cell recovering the first target cell, and the source base station adjusts the priority of the second target cell and the priority of other cells in the neighboring cell to before cell switching through inter-station communication.
In another way, 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 priority of other cells in the neighboring cells to before cell switching through inter-station communication.
Fig. 6 is a schematic structural diagram of a device for cell handover according to a fourth embodiment of the present invention, as shown in fig. 6, a handover device 100 provided in this embodiment includes:
the receiving module 11 is configured to receive information of a neighboring cell reported by the user equipment UE;
a judging module 12, configured to judge whether a neighboring cell of the UE includes a first target cell in a handover path, where the handover path includes information of a plurality of cells that the UE sequentially passes through, and the first target cell is a cell that the UE next passes through in the handover path;
A switching module 13, configured to control, when the first target cell is included in a neighboring cell of the UE, the UE to switch to the first target cell;
an obtaining module 14, configured to obtain signal quality information of a neighboring cell of the first target cell when the neighboring cell of the UE does not include the first target cell, where the neighboring cell of the first target cell does not belong to the handover path;
an adjustment module 15, configured to adjust a priority of a neighboring cell of the first target cell when determining to switch the UE to a second target cell of the neighboring cells of the first target cell according to signal quality information of the neighboring cells of the first target cell, where the adjusted priority of the second target cell is higher than a priority of other cells of 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 the user service bearer requirement.
Optionally, the switching module 13 is specifically configured to: when the neighbor cell of the UE comprises the first target cell, judging whether the first target cell meets the user service bearing requirement 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 switch to the first target cell.
Optionally, the method further comprises a determining module for: determining available cells meeting the 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 a cell with the best signal quality from available cells meeting the user service bearing requirements as the second target cell.
Optionally, the signal quality information of the neighboring cells of the first target cell includes the number of measurement reports reported by the neighboring cells in a preset time period, a receiving level of each measurement report, a signal-to-noise ratio of each measurement report, and background noise of each measurement report; the determining, according to the signal quality information of the neighboring cells of the first target cell, an available cell satisfying the 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 adjacent cells 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 the judgment threshold, determining that the adjacent cell meets the user service bearing requirement.
Optionally, the system further comprises a sending module, configured to send signal quality information of the neighboring cells 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 the UE to be 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 priority of a neighboring cell recovering the first target cell; and adjusting the priority of the second target cell and the priority of other cells in the adjacent cells to be before cell 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 the highest through inter-station communication, and adjusting the priority of other cells in the adjacent cells to be the lowest through inter-station communication.
Optionally, the acquiring module 14 is specifically configured to:
determining a target area by taking the position of the first target cell as an origin and taking a preset distance as a radius;
determining cells in the target area as candidate cells;
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 value, determining the candidate cell as the adjacent cell of the first target cell.
The apparatus of the present embodiment may be used to execute the method described in any one of the first to third embodiments, and the specific implementation manner and technical effect are similar, and are not repeated here.
Fig. 7 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present application, as shown in fig. 7, the electronic device 200 includes: the processor 21, the memory 22, and the transceiver 23, where the memory 22 is used to store instructions, the transceiver 23 is used to communicate with other devices, and the processor 21 is used to execute the instructions stored in the memory, so that the electronic device 200 performs the steps of the method described in any one of the foregoing embodiments one to three, and detailed implementation and technical effects are similar, and are not repeated herein.
An embodiment of the present application provides a computer readable storage medium, where computer execution instructions are stored, where the computer execution instructions are used to implement the method steps described in any one of the foregoing embodiments one to three, and specific implementation manner and technical effects are similar, and are not repeated herein.
An embodiment seven of the present application provides a computer program product, which includes a computer program, where the computer program when executed by a processor implements the method steps described in any of the foregoing embodiments one to three, and the specific implementation manner and technical effects are similar, and are not repeated herein.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within 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 (12)
1. A method of cell switching, comprising:
the source base station receives information of a neighbor cell reported by User Equipment (UE);
The source base station judges whether a neighboring 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 the UE sequentially passes through, and the first target cell is a cell which the UE next passes through in the switching path;
when the neighbor 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 neighbor cell of the UE does not comprise the first target cell, the source base station acquires signal quality information of the neighbor cell of the first target cell, wherein the neighbor cell of the first target cell does not belong to the switching path;
when determining to switch the UE to a second target cell in the neighboring cells of the first target cell according to the signal quality information of the neighboring cells of the first target cell, the source base station adjusts the priority of the neighboring cells of the first target cell, wherein the priority of the second target cell after adjustment is higher than the priority of other cells in the neighboring cells of the first target cell;
the source base station controls the UE to be switched to the second target cell;
the method further comprises the steps of:
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.
2. The method according to claim 1, wherein the first target cell and/or the second target cell each meet user traffic bearer requirements.
3. The method according to claim 2, wherein when the first target cell is included in the neighbor cell of the UE, the source base station controls the UE to switch to the first target cell, comprising:
when the neighbor 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 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.
4. The method according to claim 2, wherein after the source base station acquires signal quality information of the neighboring cell of the first target cell, further comprising:
the source base station determines available cells meeting the 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.
5. The method of claim 4, wherein the signal quality information of the neighboring cells of the first target cell includes a number of measurement reports reported by the neighboring cells during a preset period of time, 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 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 comprises:
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 adjacent cells 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 the judgment threshold, determining that the adjacent cell meets the user service bearing requirement.
6. The method according to claim 2, wherein after the source base station acquires signal quality information of the neighboring cell of the first target cell, further comprising:
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 the UE to be switched to the second target cell.
7. The method of claim 1, 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 priority of a neighboring cell recovering the first target cell;
and the source base station adjusts the priority of the second target cell and the priority of other cells in the adjacent cells to before cell switching through inter-station communication.
8. The method of claim 1, wherein the source base station adjusting the priority of the neighboring cells comprises:
the source base station adjusts the priority of the second target cell to be the highest through inter-station communication;
the source base station adjusts the priority of other cells in the adjacent cells to the lowest through inter-station communication.
9. The method of claim 8, wherein the source base station obtaining signal quality information of a neighboring cell 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 taking a preset distance as a radius;
determining cells in the target area as candidate cells;
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 value, determining the candidate cell as the adjacent cell of the first target cell.
10. An apparatus for cell switching, comprising:
the receiving module is used for receiving the information of the neighbor cell reported by the User Equipment (UE);
the judging module is used for judging whether the neighboring 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 the UE sequentially passes through, and the first target cell is a cell which the UE passes through next in the switching 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 signal quality information of a neighboring cell of the first target cell when the neighboring cell of the UE does not include 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 determining to switch the UE to a second target cell of the neighboring cells of the first target cell according to signal quality information of the neighboring cells of the first target cell, where the adjusted priority of the second target cell is higher than a priority 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;
the adjustment module is also used for: 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.
11. An electronic device, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the method of any one of claims 1 to 9.
12. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1 to 9.
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