CN112888034B - Directional switching method, device, storage medium and base station - Google Patents
Directional switching method, device, storage medium and base station Download PDFInfo
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- CN112888034B CN112888034B CN201911204849.XA CN201911204849A CN112888034B CN 112888034 B CN112888034 B CN 112888034B CN 201911204849 A CN201911204849 A CN 201911204849A CN 112888034 B CN112888034 B CN 112888034B
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
- H04W36/385—Reselection control by fixed network equipment of the core network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
Abstract
In the technical scheme of the directional switching method, the device, the storage medium and the base station provided by the embodiment of the invention, the moving speed of the terminal is calculated according to the frequency offset value of the user, after the moving speed of the terminal exceeds the preset high-speed threshold value, the moving direction of the terminal is determined by acquiring the cell access information of the terminal, the error cell is determined from the preset private network cell according to the moving direction of the terminal and the position information of the terminal acquired in advance, the switchable cell is determined according to the private network cell and the error cell, and a directional switching instruction is sent to the terminal, so that the terminal can be switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell, and the directional switching of the network can be realized when the terminal is in a special networking scene such as bifurcation or multi-line intersection in a high-speed or high-speed railway networking, thereby avoiding the problem that the user cannot switch back to the correct cell after switching to the error cell.
Description
[ field of technology ]
The present invention relates to the field of communications technologies, and in particular, to a directional handover method, a device, a storage medium, and a base station.
[ background Art ]
Because of the singleness and rapidity of highways or highways, communication operators generally adopt a private network form for coverage. However, in the high-speed or high-speed networking, the situation of line crossing exists, and special networking scenes such as a bifurcation scene or a multi-line intersection scene of the lines are formed. In the related art, the scheme of directional switching in a high-speed environment is not suitable for special scenes such as a three-way intersection or a four-way intersection in high-speed networking. Therefore, the prior art lacks a scheme which can be suitable for realizing the directional switching of the network in the special networking scenes such as bifurcation or multi-line intersection in the high-speed or high-speed railway networking, and solves the problem that the user cannot switch back to the correct cell after switching to the wrong cell.
[ invention ]
In view of the above, the invention provides a directional switching method, a device, a storage medium and a base station, which can be suitable for realizing the directional switching of a network in special networking scenes such as bifurcation or multi-line intersection in a high-speed or high-speed networking, thereby avoiding the problem that a user cannot switch back to a correct cell after switching to the wrong cell.
In one aspect, an embodiment of the present invention provides a directional switching method, including:
calculating the moving speed of the terminal according to the frequency offset value of the user;
judging whether the moving speed of the terminal is greater than or equal to a preset high-speed threshold value or not;
if the moving speed of the terminal is judged to be greater than or equal to a preset high-speed threshold value, determining the moving direction of the terminal from the cell access information of the terminal;
determining an error cell from preset private network cells according to the moving direction of the terminal and the pre-acquired position information of the terminal;
determining a switchable cell according to the private network cell and the error cell;
and sending a directional switching instruction to the terminal, wherein the directional switching instruction carries information of a switchable cell so that the terminal can be switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell.
Optionally, the calculating the moving speed of the terminal according to the user frequency offset value includes:
acquiring a user frequency offset value reported by the terminal periodically, and calculating Doppler frequency shift according to the user frequency offset value of the adjacent period;
calculating an angle between the moving direction of the terminal and the signal propagation direction of the base station through the pre-acquired distance between the terminal and the base station and the signal propagation direction of the base station;
according to the Doppler frequency shift calculation formula:
and calculating the moving speed v of the terminal, wherein Δf is Doppler frequency shift, f is carrier frequency, c is electromagnetic wave propagation speed, v is the moving speed of the terminal, and θ is the angle between the moving direction of the terminal and the base station signal propagation direction.
Optionally, before determining the moving direction of the terminal from the cell access information of the terminal, the method includes:
and acquiring the cell access information of the terminal through the X2 interface signaling.
Optionally, the cell access information includes road identification information of a private network cell to which the terminal is connected and direction identification information of the private network cell to which the terminal is connected.
The determining the moving direction of the terminal from the cell access information of the terminal comprises the following steps:
inquiring the road identification of the private network cell connected with the terminal from the cell access information of the terminal;
if the number of private network cells with the same road mark is greater than or equal to a preset threshold value, determining the extending direction of the road marked by the same road mark according to the direction mark information of the private network cells with the same road mark connected by the terminal;
and determining the moving direction of the terminal as the moving direction of the terminal according to the extending direction of the road marked by the same road mark and the pre-acquired traveling line direction.
Optionally, the determining, according to the moving direction of the terminal and the pre-acquired location information of the terminal, an error cell from preset private network cells includes:
determining scene information of the terminal according to the pre-acquired position information of the terminal and the pre-acquired line information, wherein the scene information comprises a non-intersection scene or an intersection scene;
if the terminal is judged to be in the intersection scene according to the scene information, determining private network cells in other directions except the terminal moving direction as error cells according to the moving direction of the terminal.
Optionally, before determining the switchable cell according to the private network cell and the error cell, the method further includes:
acquiring a first cell switching request reported by the terminal, wherein the first cell switching request carries information of a private network cell;
the determining a switchable cell according to the private network cell and the error cell comprises the following steps:
and eliminating the error cell from the private network cell corresponding to the private network cell information, and determining the rest private network cells as the switchable cells.
Optionally, the determining a switchable cell according to the private network cell and the error cell includes:
configuring cell individual offset parameters for the error cell, and sending an RRC connection reconfiguration message to the terminal so that the terminal generates a second cell switching request according to the RRC connection reconfiguration message;
acquiring a second cell switching request reported by the terminal, wherein the second cell switching request carries information of a private network cell;
and determining the switchable cell corresponding to the information of the private network cell as the switchable cell.
In another aspect, an embodiment of the present invention provides a directional switching device, including:
the calculation module is used for calculating the moving speed of the terminal according to the frequency offset value of the user;
the judging module is used for judging whether the moving speed of the terminal is greater than or equal to a preset high-speed threshold value;
the determining module is used for determining the moving direction of the terminal from the cell access information of the terminal if the judging module judges that the moving speed of the terminal is greater than or equal to a preset high-speed threshold value; determining an error cell from preset private network cells according to the moving direction of the terminal and the pre-acquired position information of the terminal; determining a switchable cell according to the private network cell and the error cell;
and the sending module is used for sending a directional switching instruction to the terminal, wherein the directional switching instruction carries information of the switchable cell so that the terminal can be switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell.
On the other hand, the embodiment of the invention provides a storage medium, which comprises a stored program, wherein the device where the storage medium is located is controlled to execute the directional switching method when the program runs.
In another aspect, an embodiment of the present invention provides a base station, including a memory and a processor, where the memory is configured to store information including program instructions, and the processor is configured to control execution of the program instructions, where the program instructions are loaded by the processor and execute the steps of the directional handover method described above.
According to the technical scheme provided by the embodiment of the invention, the moving speed of the terminal is calculated according to the frequency offset value of the user, after the moving speed of the terminal exceeds the preset high-speed threshold value, the moving direction of the terminal is determined by acquiring the cell access information of the terminal, the error cell is determined from the preset private network cell according to the moving direction of the terminal and the position information of the terminal, the switchable cell is determined according to the private network cell and the error cell, and the directional switching instruction is sent to the terminal, so that the terminal can be switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell, and the directional switching of the network can be realized in special networking scenes such as bifurcation or multi-line intersection in the high-speed or high-speed railway networking, thereby avoiding the problem that the user cannot switch back to the correct cell after switching to the error cell.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a directional handover method according to an embodiment of the present invention;
fig. 2 is a flowchart of a directional handover method according to another embodiment of the present invention;
fig. 3 is a schematic view of a scenario illustrating an angle between a moving direction of a terminal and a propagation direction of a base station signal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a three-way intersection scene according to an embodiment of the present invention;
FIG. 5 is a schematic view of a four-way intersection scene according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an orientation switching device according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a base station according to an embodiment of the present invention.
[ detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Fig. 1 is a flowchart of a directional switching method according to an embodiment of the present invention, as shown in fig. 1, where the method includes:
and 101, calculating the moving speed of the terminal according to the frequency offset value of the user.
And 104, determining an error cell from the preset private network cells according to the moving direction of the terminal and the pre-acquired position information of the terminal.
And 106, sending a directional switching instruction to the terminal, wherein the directional switching instruction carries information of the switchable cells so that the terminal can be switched to the selected switchable cells according to the position information of the terminal and the information of the switchable cells.
According to the technical scheme provided by the embodiment of the invention, the moving speed of the terminal is calculated according to the frequency offset value of the user, after the moving speed of the terminal exceeds the preset high-speed threshold value, the moving direction of the terminal is determined by acquiring the cell access information of the terminal, the error cell is determined from the preset private network cell according to the moving direction of the terminal and the position information of the terminal, the switchable cell is determined according to the private network cell and the error cell, and the directional switching instruction is sent to the terminal, so that the terminal can be switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell, and the directional switching of the network can be realized in special networking scenes such as bifurcation or multi-line intersection in the high-speed or high-speed railway networking, thereby avoiding the problem that the user cannot switch back to the correct cell after switching to the error cell.
Fig. 2 is a flowchart of a directional switching method according to another embodiment of the present invention, as shown in fig. 2, where the method includes:
In the embodiment of the invention, each step is executed by the base station.
In the embodiment of the invention, for example, a measurement report (Measurement Report, abbreviated as MR) reported by the terminal every 5s is obtained, and the measurement report includes information such as a user frequency offset value and position information of the terminal. And calculating Doppler frequency shift by acquiring the user frequency offset values of adjacent periods. For example, the user frequency offset value reported by the terminal is f1 at 8:00:00, and the user frequency offset value reported by the terminal is f2 at 8:00:05, so that the calculated doppler shift=f1-f 2.
Step 202, calculating an angle between the moving direction of the terminal and the signal propagation direction of the base station through the pre-acquired distance between the terminal and the base station and the signal propagation direction of the base station.
In the embodiment of the present invention, for example, as shown in fig. 3, the distance between the terminal S2 and the base station S1 is d, the propagation direction of the base station signal is S1-S2, and the distance d0 between the propagation directions of the base station signal S1-S2 is calculated by calculating
Thereby calculating the angle θ between the moving direction of the terminal and the propagation direction of the base station signal.
In the embodiment of the invention, Δf is doppler shift, f is carrier frequency, c is electromagnetic wave propagation speed, v is moving speed of the terminal, and θ is the angle between the moving direction of the terminal and the base station signal propagation direction. The carrier frequency f of the cell predefined by the base station can be obtained through the base station, and the propagation speed c of the electromagnetic wave is 3 x 108m/s.
In the embodiment of the invention, the preset high-speed threshold value is 120Km/s. If the moving speed of the terminal is judged to be greater than or equal to the preset high-speed threshold value, the terminal is indicated to be a high-speed rail user, and the terminal can be switched to a private network cell. If the moving speed of the terminal is judged to be smaller than the preset high-speed threshold value, the terminal is indicated to be a non-high-speed rail user and can be switched to a public network cell. The service cell comprises a private network cell and a public network cell. The private network cell is a cell covering a high-speed railway and providing service for high-speed users. The public network cell is a cell covering a home area and serving non-high-speed users.
In the embodiment of the invention, the X2 interface is an interconnection interface between base stations and supports direct transmission of data and signaling. X2 interface signaling is a signaling instruction transmitted between base stations. The X2 interface signaling includes information such as cell access information, measurement port signaling, and RRC connection reconfiguration signaling of the terminal. Specifically, the obtained cell access information of the terminal is shown in the following table 1:
TABLE 1
In the embodiment of the present invention, as shown in table 1 above, the maximum number of last accessed element information records reported in the IE value is 16, which is the information of at most 16 access cells of each terminal recorded in the cell access information of the terminal.
Step 205', send a switching instruction for switching to the public network cell to the terminal, so that the terminal switches to the public network cell according to the switching instruction, and continue to execute the step of judging whether the moving speed of the terminal is greater than or equal to the preset high-speed threshold value.
In the embodiment of the invention, the public network cell is a cell covering a residence area and provides service for non-high-speed users. And if the mobile speed of the terminal is less than the preset high-speed threshold value, the terminal is indicated to be a non-high-speed railway user, so that a switching instruction for switching to a public network cell is sent to the terminal, the terminal is switched to the public network cell according to the switching instruction, and the non-high-speed railway user is prevented from staying in a private network cell, occupying high-speed railway private network resources and interfering with the high-speed railway user.
And 206, inquiring the road identification of the private network cell connected with the terminal from the cell access information of the terminal.
In the embodiment of the present invention, before step 206, a private network cell list of each direction is established, as shown in the following tables 2 and 3:
TABLE 2
TABLE 3 Table 3
In the embodiment of the invention, the cell access information comprises road identification information of the private network cell connected with the terminal and direction identification information of the private network cell connected with the terminal. The road identifier is used for identifying the road where the private network cell is located. As shown in fig. 4, by looking up table 2, private network cells A1, A2, A3, A4 all belong to the same road a, so private network cells A1, A2, A3, A4 have the same road identifier.
And step 208, determining the moving direction of the terminal according to the extending direction of the road marked by the same road mark and the pre-acquired driving line direction.
In the embodiment of the invention, the preset threshold is 3. If the number of private network cells with the same road identification is greater than or equal to 3, the terminal is indicated to be driven in from the road identified by the same road identification. For example, the cells in which access is queried from the cell access information of the terminal include A1, A2, and A3, and by querying table 2 above, private network cells A1, A2, and A3 all belong to the same road a and have the same road identifier, so that the terminal is indicated that the road a is driven in.
The direction identifier is used for identifying the direction of the road where the private network cell is located, and the extending direction of the road can be determined by acquiring the direction identifier information of the private network cell connected with the terminal. For example, as shown in fig. 4, all private network cells A1, A2, A3, A4 in the a direction belong to the same road, the same road identifier is provided, the direction identifier information of the private network cells A1, A2, A3, A4 is obtained, and the extending direction of the road in the a direction can be determined to be the A4 to A1 direction through route judgment. The route judgment specifically comprises the step of determining the extending direction of the road marked by the same road mark according to the direction mark information of the private network cell of the same road mark connected by the terminal. After the route decision, the A4-C direction is determined as the movement direction of the terminal according to the travel route direction acquired in advance, for example, the travel route direction is the direction of travel to C.
In the embodiment of the invention, the position information of the terminal can be obtained through a measurement report reported by the terminal. The line information is pre-stored in the base station, and scene information of the terminal is determined through the position information and the line information of the terminal, wherein the position information of the terminal comprises longitude and latitude information and the like of the terminal.
In the embodiment of the invention, if the terminal is judged to be in the non-intersection scene according to the scene information, the situation that the terminal has no wrong cell interference is indicated, and the directional switching is performed through a scheme for performing the directional switching in a high-speed environment in the related technology. If the situation that the terminal is in the intersection scene with the switch is judged according to the scene information, the situation that the terminal has wrong cell interference is indicated, if the directional switching is carried out under the high-speed environment in the related technology, the problem that the user cannot switch back after switching to the wrong cell is easily caused, therefore, the private network cell in other directions except the moving direction of the terminal is required to be determined to be the wrong cell according to the moving direction of the terminal, and the user is prevented from switching to the wrong cell by continuing to execute the subsequent steps.
In the embodiment of the invention, the turnout scenes comprise a three-turnout scene and a four-turnout scene. When the terminal is in the three-way intersection scene, for example, as shown in fig. 4, when the moving direction of the terminal is in the A4-C direction, and the terminal is located in the logic cell composed of private network cells A1, B1 and C1, it can be determined that the private network cell in the B direction is an error cell. When the terminal is in a four-intersection scenario, for example, as shown in fig. 5, when the moving direction of the terminal is X-X ', and the terminal is located in private network cells X, X', Y, Y 'to form a logic cell, it can be determined that the private network cells in the Y direction and the Y' direction are error cells.
After step 210, further includes: and generating a cell filtering table according to the moving direction of the terminal and the error cell. Specifically, the cell filtering table is shown in table 4 below:
TABLE 4 Table 4
In the embodiment of the present invention, as shown in table 4 above, if the terminal is driven in the Y direction of the four intersections, the terminal moves in the Y 'direction because the terminal is required to travel straight through the intersections in a high-speed scene of the four intersections according to the route information acquired in advance, and thus the driving direction X, the driving direction Y', and the like are not considered to be the case where turning is required.
Step 211, a first cell switching request reported by a terminal is obtained, where the first cell switching request carries information of a private network cell.
In the embodiment of the invention, the private network cell comprises a switchable cell and an error cell.
In the embodiment of the invention, before the terminal reports the first cell switching request, the method further comprises the following steps: the base station sends RRC connection reconfiguration information to the terminal; and the terminal acquires the information of the private network cell according to the RRC connection reconfiguration message.
And 212, eliminating error cells from private network cells corresponding to the information of the private network cells, and determining the rest private network cells as switchable cells.
In the embodiment of the invention, the error cells are added into the blacklist by starting the blacklist function, so that the error cells can be removed from the private network cells. By eliminating the error cell, the problem that the user cannot switch back again after switching to the error cell is avoided.
In the embodiment of the present invention, as shown in fig. 4, when the moving direction of the terminal is A4-C direction, and the terminal is located in a logical cell formed by private network cells A1, B1, and C1, it may be determined that the private network cell in the B direction is an error cell. The pre-acquired private network cells comprise A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3 and C4, so that after error cells in the B direction are removed, switchable cells comprise A1, A2, A3, A4, C1, C2, C3 and C4.
And step 213, sending a directional switching instruction to the terminal, wherein the directional switching instruction carries information of the switchable cell, so that the terminal is switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell.
In the embodiment of the present invention, as shown in fig. 4, for example, when the current terminal is located in a logical cell formed by private network cells A1, B1 and C1, the terminal obtains its own location information according to the direction A4-C, and at this time, the terminal will not select the private network cells A1, A2, A3 and A4 already connected to the terminal to switch, but select the switchable cell C2 from the information of the switchable cells to switch.
Optionally, after step 210, the method further includes:
step 211', configure the cell individual offset parameters for the wrong cell and send an RRC connection reconfiguration message to the terminal, so that the terminal generates a second cell handover request according to the RRC connection reconfiguration message.
In the embodiment of the invention, the individual parameters are configured for the error cell, so that the information of the error cell is not carried in the second cell switching request generated according to the RRC connection reconfiguration message, thereby avoiding the terminal from reporting the measurement report about the error cell and reducing the air interface signaling overhead of the terminal.
Step 212', obtaining a second cell switching request reported by the terminal, where the second cell switching request carries information of the private network cell.
Step 213', the switchable cell corresponding to the private network cell information is determined as the switchable cell.
Step 214', send a directional switching instruction to the terminal, where the directional switching instruction carries information of the switchable cell, so that the terminal switches to the selected switchable cell according to the location information of the terminal and the information of the switchable cell. According to the technical scheme provided by the embodiment of the invention, the moving speed of the terminal is calculated according to the frequency offset value of the user, after the moving speed of the terminal exceeds the preset high-speed threshold value, the moving direction of the terminal is determined by acquiring the cell access information of the terminal, the error cell is determined from the preset private network cell according to the moving direction of the terminal and the position information of the terminal, the switchable cell is determined according to the private network cell and the error cell, and the directional switching instruction is sent to the terminal, so that the terminal can be switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell, and the directional switching of the network can be realized in special networking scenes such as bifurcation or multi-line intersection in the high-speed or high-speed railway networking, thereby avoiding the problem that the user cannot switch back to the correct cell after switching to the error cell.
Fig. 6 is a schematic structural diagram of an orientation switching device according to an embodiment of the present invention, as shown in fig. 6, the device includes: a calculation module 11, a judgment module 12, a determination module 13 and a transmission module 14.
The calculating module 11 is configured to calculate a moving speed of the terminal according to the user frequency offset value.
The judging module 12 is configured to judge whether the moving speed of the terminal is greater than or equal to a preset high-speed threshold.
The determining module 13 is configured to trigger the determining module 13 to continue to perform the step of determining the moving direction of the terminal from the cell access information of the terminal if the determining module 12 determines that the moving speed of the terminal is greater than or equal to a preset high-speed threshold; determining an error cell from preset private network cells according to the moving direction of the terminal and the pre-acquired position information of the terminal; and determining a switchable cell according to the private network cell and the error cell.
The sending module 14 is configured to send a directional handover instruction to a terminal, where the directional handover instruction carries information of a switchable cell, so that the terminal is handed over to a selected switchable cell according to location information of the terminal and information of the switchable cell.
In the embodiment of the present invention, the calculation module 11 of the device specifically includes: an acquisition sub-module 111 and a determination sub-module 132.
The obtaining sub-module 111 is configured to obtain a user frequency offset value periodically reported by the terminal.
The calculation sub-module 112 is configured to calculate a doppler shift according to the user frequency offset value of the adjacent period.
The acquisition sub-module 111 is further configured to obtain, in advance, a distance between the terminal and the base station and a propagation direction of a base station signal.
The calculation sub-module 112 is further configured to calculate an angle between the moving direction of the terminal and the propagation direction of the base station signal.
The calculation sub-module 112 is further configured to calculate a formula according to the doppler shift:
calculating the moving speed v of the terminal, wherein Δf is Doppler frequency shift, f is carrier frequency, c is electromagnetic wave propagation speed, v is the moving speed of the terminal, and θ is the moving speed of the terminalThe angle between the direction of movement and the direction of propagation of the base station signal.
In the embodiment of the invention, the device further comprises: and an acquisition module 15.
The acquiring module 15 is configured to acquire cell access information of the terminal through X2 interface signaling.
In the embodiment of the present invention, the determining module 13 of the device includes: a query sub-module 131 and a determination sub-module 132.
The inquiring sub-module 131 is configured to inquire the road identifier of the private network cell to which the terminal is connected from the cell access information of the terminal.
The query sub-module 131 is further configured to query that the number of private network cells with the same road identifier is greater than or equal to a preset threshold.
The determining submodule 132 is further configured to determine an extending direction of the road identified by the same road identifier according to direction identifier information of a private network cell of the same road identifier connected to the terminal.
The determining submodule 132 is further configured to determine, according to the extending direction of the road identified by the same road identifier and the pre-acquired driving route direction, that the moving direction of the terminal is the moving direction of the terminal.
In the embodiment of the present invention, the determining module 13 of the device further includes: and a judgment sub-module 133.
The determining submodule 132 is further configured to determine scene information of the terminal according to the pre-acquired position information of the terminal and the pre-acquired line information, where the scene information includes a non-intersection scene or an intersection scene.
The judging sub-module 133 is configured to judge whether the terminal is in a scene with an intersection according to the scene information.
The determining sub-module 132 is further configured to trigger the determining sub-module 132 to continue to execute the step of determining that the private network cell in the other directions except the moving direction of the terminal is the wrong cell according to the moving direction of the terminal if the determining sub-module 133 determines that the terminal is in the intersection scene according to the scene information. In the embodiment of the present invention, the obtaining module 15 of the device is further configured to obtain a first cell switching request reported by the terminal, where the first cell switching request carries information of a private network cell.
In the embodiment of the present invention, the determining module 13 of the device further includes:
the determining submodule 132 is further configured to reject the error cell from the private network cell corresponding to the information of the private network cell, and determine the remaining private network cells as the switchable cells.
In the embodiment of the present invention, the determining module 13 of the device further includes: a processing sub-module 134 and an acquisition sub-module 135.
The processing sub-module 134 is configured to configure a cell individual offset parameter for the error cell, and send an RRC connection reconfiguration message to the terminal, so that the terminal generates a second cell handover request according to the RRC connection reconfiguration message.
The obtaining sub-module 135 is further configured to obtain a second cell handover request reported by the terminal, where the second cell handover request carries information of the private network cell.
The determining submodule 132 is further configured to determine a switchable cell corresponding to the information of the private network cell as a switchable cell.
According to the technical scheme provided by the embodiment of the invention, the moving speed of the terminal is calculated according to the frequency offset value of the user, after the moving speed of the terminal exceeds the preset high-speed threshold value, the moving direction of the terminal is determined by acquiring the cell access information of the terminal, the error cell is determined from the preset private network cell according to the moving direction of the terminal and the position information of the terminal, the switchable cell is determined according to the private network cell and the error cell, and the directional switching instruction is sent to the terminal, so that the terminal can be switched to the selected switchable cell according to the position information of the terminal and the information of the switchable cell, and the directional switching of the network can be realized in special networking scenes such as bifurcation or multi-line intersection in the high-speed or high-speed railway networking, thereby avoiding the problem that the user cannot switch back to the correct cell after switching to the error cell.
The embodiment of the invention provides a storage medium, which comprises a stored program, wherein the program is used for controlling equipment in which the storage medium is positioned to execute the steps of the embodiment of the directional switching method, and the specific description can be seen from the embodiment of the directional switching method.
The embodiment of the invention provides a base station, which comprises a memory and a processor, wherein the memory is used for storing information comprising program instructions, the processor is used for controlling the execution of the program instructions, and the program instructions realize the steps of the directional switching method when being loaded and executed by the processor. For a specific description, reference may be made to the embodiments of the directional handover method described above.
Fig. 7 is a schematic diagram of a base station according to an embodiment of the present invention. As shown in fig. 7, the base station 3 of this embodiment includes: the processor 21, the memory 22, and the computer program 23 stored in the memory 22 and capable of running on the processor 21, where the computer program 23 when executed by the processor 21 implements the directional switching method in the embodiment, and is not repeated herein. Alternatively, the computer program, when executed by the processor 21, implements the functions of the embodiments applied to each model/unit in the directional switching device, and in order to avoid repetition, will not be described in detail herein.
The base station 3 includes, but is not limited to, a processor 21, a memory 22. It will be appreciated by those skilled in the art that fig. 7 is merely an example of the base station 3 and does not constitute a limitation of the base station 3, and may include more or less components than illustrated, or may combine certain components, or different components, e.g., the base station 3 may also include input and output devices, network access devices, buses, etc.
The processor 21 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 22 may be an internal storage unit of the base station 3, such as a hard disk or a memory of the base station 3. The memory 22 may also be an external storage device of the base station 3, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the base station 3. Further, the memory 22 may also include both an internal storage unit of the base station 3 and an external storage device. The memory 22 is used to store computer programs and other programs and data required by the base station 3. The memory 22 may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a base station, or a network device, etc.) or a Processor (Processor) to perform part of the steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (9)
1. A method of directional handover, the method comprising:
calculating the moving speed of the terminal according to the frequency offset value of the user;
judging whether the moving speed of the terminal is greater than or equal to a preset high-speed threshold value or not;
if the moving speed of the terminal is judged to be greater than or equal to a preset high-speed threshold value, determining the moving direction of the terminal from the cell access information of the terminal, wherein the cell access information comprises road identification information of a private network cell connected with the terminal and direction identification information of the private network cell connected with the terminal;
determining an error cell from preset private network cells according to the moving direction of the terminal and the pre-acquired position information of the terminal;
determining a switchable cell according to the private network cell and the error cell;
sending a directional switching instruction to a terminal, wherein the directional switching instruction carries information of a switchable cell so that the terminal can be switched to a selected switchable cell according to the position information of the terminal and the information of the switchable cell;
the determining the moving direction of the terminal from the cell access information of the terminal comprises the following steps:
inquiring the road identification of the private network cell connected with the terminal from the cell access information of the terminal;
if the number of private network cells with the same road mark is greater than or equal to a preset threshold value, determining the extending direction of the road marked by the same road mark according to the direction mark information of the private network cells with the same road mark connected by the terminal;
and determining the moving direction of the terminal as the moving direction of the terminal according to the extending direction of the road marked by the same road mark and the pre-acquired traveling line direction.
2. The method of claim 1, wherein the calculating the moving speed of the terminal according to the user frequency offset value comprises:
acquiring a user frequency offset value reported by the terminal periodically, and calculating Doppler frequency shift according to the user frequency offset value of the adjacent period;
calculating an angle between the moving direction of the terminal and the signal propagation direction of the base station through the pre-acquired distance between the terminal and the base station and the signal propagation direction of the base station;
according to the Doppler frequency shift calculation formula:
and calculating the moving speed v of the terminal, wherein Δf is Doppler frequency shift, f is carrier frequency, c is electromagnetic wave propagation speed, v is the moving speed of the terminal, and θ is the angle between the moving direction of the terminal and the base station signal propagation direction.
3. The method according to claim 1, wherein before determining the movement direction of the terminal from the cell access information of the terminal, the method comprises:
and acquiring the cell access information of the terminal through the X2 interface signaling.
4. The method according to claim 1, wherein the determining an error cell from preset private network cells according to the movement direction of the terminal and the pre-acquired location information of the terminal includes:
determining scene information of the terminal according to the pre-acquired position information of the terminal and the pre-acquired line information, wherein the scene information comprises a non-intersection scene or an intersection scene;
if the terminal is judged to be in the intersection scene according to the scene information, determining private network cells in other directions except the terminal moving direction as error cells according to the moving direction of the terminal.
5. The method of claim 1, further comprising, prior to said determining a switchable cell based on said private network cell and said wrong cell:
acquiring a first cell switching request reported by the terminal, wherein the first cell switching request carries information of a private network cell;
the determining a switchable cell according to the private network cell and the error cell comprises the following steps:
and eliminating the error cell from the private network cell corresponding to the private network cell information, and determining the rest private network cells as the switchable cells.
6. The method of claim 1, wherein said determining a switchable cell from said private network cell and said wrong cell comprises:
configuring cell individual offset parameters for the error cell, and sending an RRC connection reconfiguration message to the terminal so that the terminal generates a second cell switching request according to the RRC connection reconfiguration message;
acquiring a second cell switching request reported by the terminal, wherein the second cell switching request carries information of a private network cell;
and determining the switchable cell corresponding to the information of the private network cell as the switchable cell.
7. A directional switching device, the device comprising:
the calculation module is used for calculating the moving speed of the terminal according to the frequency offset value of the user;
the judging module is used for judging whether the moving speed of the terminal is greater than or equal to a preset high-speed threshold value;
the determining module is used for determining the moving direction of the terminal from the cell access information of the terminal if the judging module judges that the moving speed of the terminal is greater than or equal to a preset high-speed threshold value, wherein the cell access information comprises the road identification information of the private network cell connected with the terminal and the direction identification information of the private network cell connected with the terminal; determining an error cell from preset private network cells according to the moving direction of the terminal and the pre-acquired position information of the terminal; determining a switchable cell according to the private network cell and the error cell;
the terminal is used for receiving the information of the switchable cells from the terminal, and sending a directional switching instruction to the terminal, wherein the directional switching instruction carries the information of the switchable cells so that the terminal can be switched to the selected switchable cells according to the position information of the terminal and the information of the switchable cells;
the determining module comprises a query submodule and a determining submodule;
the inquiring sub-module is used for inquiring the road identification of the private network cell connected with the terminal from the cell access information of the terminal;
the determining submodule is used for determining the extending direction of the road marked by the same road mark according to the direction marking information of the private network cells of the same road mark connected with the terminal if the inquiring submodule inquires that the number of the private network cells with the same road mark is larger than or equal to a preset threshold value;
and the determining submodule is also used for determining the moving direction of the terminal as the moving direction of the terminal according to the extending direction of the road marked by the same road mark and the pre-acquired driving line direction.
8. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to perform the directional switching method of any one of claims 1 to 6.
9. A base station comprising a memory for storing information including program instructions and a processor for controlling execution of the program instructions, characterized in that the program instructions, when loaded and executed by the processor, implement the steps of the directional handover method of any one of claims 1 to 6.
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| CN101867945B (en) * | 2010-05-31 | 2012-10-31 | 北京交通大学 | High-speed railway mobile network covering method based on distributed antenna and fixed switching channel |
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| CN102300274A (en) * | 2011-09-14 | 2011-12-28 | 北京邮电大学 | Geographical-position-information-based fast handover method for time-division duplex long term evolution (TD-LTE) system |
| CN105142194A (en) * | 2015-09-06 | 2015-12-09 | 上海华为技术有限公司 | Cell switching method, base station and system |
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