CN106912054B - Access point control method and system for rail transit communication system - Google Patents
Access point control method and system for rail transit communication system Download PDFInfo
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- CN106912054B CN106912054B CN201710105798.XA CN201710105798A CN106912054B CN 106912054 B CN106912054 B CN 106912054B CN 201710105798 A CN201710105798 A CN 201710105798A CN 106912054 B CN106912054 B CN 106912054B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention relates to an access point control method and system of a rail transit communication system, wherein the method comprises the following steps: acquiring first user quantity information of access users of access points of all cells at the current moment and second user quantity information of the access users at the last moment; determining a current access point to which a user migrates at the current moment according to first user quantity information and second user quantity information corresponding to each access point, determining at least one access point which is adjacent to the current access point in the user movement direction as an associated access point of the current access point, and controlling the signal transmission state of the associated access point to be an open state; and if the duration time of the number of the access users of the associated access point reaches a preset time threshold, sending a control signal to the associated access point, and controlling the signal transmission state of the associated access point to be switched from an open state to a closed state.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to an access point control method and system of a rail transit communication system.
Background
The rapid development of mobile communication drives the explosive growth of mobile internet and high-bandwidth data services, and the continuous increase of smart phones and other wireless broadband users leads to the explosive increase of mobile broadband data traffic, but the frequency spectrum resources are always limited within a certain time and space range. The scarcity of resources, caused by the contradiction between the relatively insufficient resources and the absolutely increasing demands of users, is a significant problem faced by the current development of wireless technology.
Two effective measures for dealing with the shortage of the spectrum due to the sudden increase of the traffic are to introduce an unlicensed spectrum and increase the spectrum multiplexing degree, however, no matter the unlicensed spectrum or the spectrum multiplexing degree is introduced, effective control of signal transmission is required to reduce the signal interference, and the current measures for reducing the signal transmission interference include: pilot frequency emission, soft frequency multiplexing, power control, carrier emission avoidance and beam forming. However, the interference-reducing signal transmission methods mentioned in the prior art all have a characteristic that continuous signal transmission exists in the whole cell coverage area, which causes serious interference of the co-frequency or adjacent frequency spectrum around the cell and reduces the quality of the spectrum. For the track traffic coverage, due to the long traffic route and the large span, the continuous signal transmission has more serious influence on the peripheral co-frequency or adjacent frequency spectrum interference.
In summary, the interference of the conventional signal transmission method is serious.
Disclosure of Invention
Therefore, it is necessary to provide an access point control method and system for a rail transit communication system to solve the problem of serious interference of the existing signal transmission method.
An access point control method of a rail transit communication system comprises the following steps:
acquiring first user quantity information of access users of access points of all cells at the current moment and second user quantity information of the access users at the last moment;
determining a current access point to which a user migrates at the current moment according to first user quantity information and second user quantity information corresponding to each access point, determining at least one access point which is adjacent to the current access point in the user movement direction as an associated access point of the current access point, and controlling the signal transmission state of the associated access point to be an open state;
and if the duration time of the number of the access users of the associated access point reaches a preset time threshold, sending a control signal to the associated access point, and controlling the signal transmission state of the associated access point to be switched from an open state to a closed state.
An access point control system of a rail transit communication system, comprising:
the access point of each cell is used for accessing first user quantity information of users at the current moment and second user quantity information of the users at the last moment;
the first control module is used for determining a current access point to which a user migrates at the current moment according to first user quantity information and second user quantity information corresponding to each access point, determining at least one access point which is adjacent to the current access point in the user movement direction as an associated access point of the current access point, and controlling the signal transmission state of the associated access point to be in an open state;
and the second control module is used for sending a control signal to the associated access point and controlling the signal transmission state of the associated access point to be switched from an open state to a closed state if the duration time for the associated access point to access the users reaches a preset time threshold.
According to the access point control method and the access point control system of the rail transit communication system, when the access point has user access, the signal transmitting state of the associated access point of the access point is controlled to be in the open state, and when the associated access point does not have user access for a period of time, the signal transmitting state of the associated access point is controlled to be switched from the open state to the closed state, so that the problem that the signal along the rail transit is continuously transmitted in a large range to cause the frequency spectrum interference with the rail transit coverage system to be serious can be avoided, and the frequency spectrum quality is effectively improved.
Drawings
Fig. 1 is a flowchart of an access point control method of a rail transit communication system according to an embodiment;
FIG. 2 is a schematic diagram of a rail transit communication system of one embodiment;
FIG. 3 is a diagram of a public mobile communications system according to one embodiment;
fig. 4 is a network architecture diagram of an access point control system of the track traffic communication system of the first embodiment;
fig. 5 is a network architecture diagram of an access point control system of the track traffic communication system of the second embodiment;
fig. 6 is a schematic structural diagram of an access point control system of a rail transit communication system according to an embodiment.
Detailed Description
The technical solution of the present invention will be explained below with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an access point control method for a rail transit communication system, which may include the following steps:
s1, acquiring first user quantity information of an access point of each cell accessing a user at the current moment and second user quantity information of the access user at the last moment;
each cell at least comprises one access point, and the access points are linearly distributed according to the characteristics of a rail transit scene and are obviously different from planar distribution in a public mobile communication system. When moving, the user generally moves along the track traffic. The schematic diagrams of the rail transit system and the public mobile communication system are respectively shown in fig. 2 and fig. 3. Fig. 2 shows the situation when 2 cells each contain 2 access points. At time T0, the user moves to cell 1, access point 1, at time T1, the user moves to cell 1, access point 0, at time T2, the user moves to cell 0, access point 1, at time T3, the user moves to cell 0, access point 0.
In this step, the first user quantity information and the second user quantity information accessed by each access point of each cell are respectively counted, and the time of each cell is kept synchronous during counting. In one embodiment, the network architecture of the access point control system is as shown in fig. 4, in this case, the first user number information and the second user number information may be obtained by the signal transmission control node directly receiving information sent from each cell, or may be obtained by the signal transmission control node receiving intermediate node forwarding information forwarded to information about the number of users accessed by each access point of the cell and sent by each cell. In an embodiment, when the number of access users of the access point changes, each cell may upload the first user number information and the second user number information corresponding to the access point of the cell to the signal transmission control node, or each cell may send the first user number information and the second user number information corresponding to the access point of the cell to the signal transmission control node according to a preset frequency.
In one embodiment, a network architecture of the access point control system is as shown in fig. 5, in which case, each access point may count first user quantity information and second user quantity information of users accessed by itself and send the information to other cells. For each cell, the access points may be divided into a first group of access points and a second group of access points, where the first group of access points is the access points in the cell, and the second group of access points is the access points other than the first group of access points. When each cell receives the first user quantity information and the second user quantity information sent by the second group of access points, the cell corresponding to the second group of access points can directly receive the information, and the cell can also receive the information forwarded by a third party. In addition, when the cell receives the first user number information and the second user number information of the first group of access points, the cell can directly receive the user number information which is sent by the internal access user management module and accessed by the first group of access points. In an embodiment, when the number of access users of the access point changes, each cell may upload the first user number information and the second user number information corresponding to the access point of the cell to other cells, or each cell may send the first user number information and the second user number information corresponding to the access point of the cell to other cells according to a preset frequency.
S2, determining a current access point to which a user migrates at the current moment according to first user quantity information and second user quantity information corresponding to each access point, determining at least one access point which is adjacent to the current access point in the user movement direction as an associated access point of the current access point, and controlling the signal transmission state of the associated access point to be in an open state;
a history access record table may be established, and the counted first user quantity information and second user quantity information may be stored in the history access record table. The history access record table should include at least two recorded information of time (current time and last time). To facilitate analytical comparisons, the individual access points in the historical access record table may be ordered by physical proximity. Specifically, the historical access record table may include identification information of each cell, identification information of an access point of each cell, first user quantity information of each access point accessing a user at a current time, and second user quantity information of each access point accessing the user at a previous time; and determining the current access point to which the user migrates at the current moment according to the historical access record table. The cell identification information may be a cell ID or other information that uniquely identifies a cell, and similarly, the access point identification information may be information that uniquely identifies an access point. The historical access record table can be established by a signal transmission control node and can also be established by a control cell.
Specifically, the current access point may be determined according to the following several ways:
the first method is as follows:
if the number of the access users of the first access point at the last moment is smaller than a preset first threshold value and the number of the access users of the first access point at the current moment is larger than a preset second threshold value, determining that the first access point is the current access point; wherein the first threshold value is less than or equal to the second threshold value. In an embodiment, both the first threshold and the second threshold are set to 0, in this case, if the number of users accessed by the first access point at the previous time is zero and the number of users accessed by the first access point at the current time is not zero, it is determined that the first access point is the current access point.
The second method comprises the following steps:
and if the difference value between the number of the access users of the first access point at the current moment and the number of the access users of the adjacent access points at the current moment is larger than a preset third threshold value, judging that the first access point is the current access point.
After determining the current access point, an associated access point may be determined according to the following: determining the user movement direction according to the original access point to which the user has migrated at the previous moment and the current access point; setting at least one access point which is adjacent to the current access point in the moving direction of the user as an associated access point of the current access point.
For example, for the first mode, if the number of users accessed by the access point N at time T (m) is smaller than a preset threshold 1, and the number of users accessed at time T (m +1) is greater than a preset threshold 2, it is determined that the access user migrates between the access point (N-1) and the access point N, where the current access point is the access point N, and at this time, at least one access point from the access point (N +1) (including the access point (N +1)) is determined as an associated access point; the method for determining the access point (N-1) comprises the steps that when the user is judged to move into the access point N at the moment T (m +1), the time T (m +1) is searched forward according to the time dimension, the access point which is accessed by the user and is not accessed by the access point N at the last time is determined as the access point (N-1), correspondingly, the time T (m +1) is searched backward according to the time dimension, and one access point which is adjacent to the access point N is determined as the access point (N + 1).
For the special case of the first mode, if the number of access users is not available at the time of T (m) by the access point N, and if the number of access users is available at the time of T (m +1), it is determined that the access users migrate between the access point (N-1) and the access point N, where the current access point is the access point N, and at least one access point from the access point (N +1) (including the access point (N +1)) is determined as an associated access point; the method for determining the access point (N-1) comprises the steps that when the user is judged to move into the access point N at the moment T (m +1), the time T (m +1) is searched forward according to the time dimension, the access point which is accessed by the user and is not accessed by the access point N at the last time is determined as the access point (N-1), correspondingly, the time T (m +1) is searched backward according to the time dimension, and one access point which is adjacent to the access point N is determined as the access point (N + 1).
And in the second mode, at the time T (m), if the number of users accessed by the access point N is greater than the number of users accessed by the access point (N-1) by more than the threshold 3, determining that the access users migrate between the access point (N-1) and the access point N, and determining at least one access point from the access point (N +1) (including the access point (N +1)) as an associated access point. The access point (N-1) is determined by searching forward from the time T (m) according to the time dimension when the time T (m) determines that the user moves into the access point N, determining the access point which has the access of the user except the access point N for the last time as the access point (N-1), and correspondingly, determining an access point which is adjacent to the access point N and searched backward from the time T (m) according to the time dimension as the access point (N + 1).
After determining the current node and the associated node, directly communicating with the associated access point through a signal transmission control node or a control cell to start signal transmission of the access point; or, the cell to which the associated access point belongs may be notified by the signal transmission control node or the control cell to control the associated access point to start signal transmission.
And S3, if the duration time that the number of the associated access point access users is zero reaches a preset time threshold, sending a control signal to the associated access point, and controlling the signal transmission state of the associated access point to be switched from an open state to a closed state.
The preset time threshold may be set according to an actual situation, for example, according to a moving speed of a user, and when the moving speed of the user is fast, the preset time threshold may take a smaller value; conversely, when the moving speed of the user is slow, the preset time threshold may take a larger value.
The access point can be directly communicated with the associated access point through a signal transmission control node or a control cell so as to close the signal transmission of the access point; or, the cell to which the associated access point belongs may be notified by the signal transmission control node or the control cell to control the associated access point to turn off signal transmission.
The functions of the various parts of the system architecture shown in fig. 4 and 5, respectively, are further described below.
The system as shown in fig. 4 may include a cell node and a signal transmission control node, each of which functions as follows:
a cell node: the node is responsible for reporting the information of the number of access users of the access point administered by the cell to the signal transmission control node, and executing the signal transmission on and off of the access point according to the control information of the signal transmission control node;
the signal emission control node: the node is responsible for collecting the number information of the access users of each access point, establishing a user history access record table, judging the migration condition of the access users based on the user history access record table, and generating configuration information for controlling the cell node to stop acquiring the signal transmission of the development access point.
The system shown in fig. 5 may include an access point user number information obtaining module, a history access record table establishing module, a signal transmission control module, and a configuration module, where the functions of the modules are as follows:
the access point accesses the user number information acquisition module: the module is responsible for receiving the user number information accessed by the first group of access points and the second group of access points and sending the information to the historical access record table establishing module;
a history access record table establishing module: the method comprises the steps that user number information accessed by each access point at each moment is established based on time dimension, a user history access record table is formed, and the latest user history access record table is sent to a signal emission control module;
a configuration module: the module is responsible for acquiring various threshold parameters, presetting migration relations among access points and associating the access points such as point configuration information and the like, and sending the information to the signal transmission control module;
the signal emission control module: the module is responsible for judging whether the accessed user has the behavior of migrating between the preset access points, if so, the signal transmission of the associated access point is started after the preset time, and the signal transmission of the associated access point is stopped under the condition of meeting the preset condition, and if not, the signal transmission state of the access point is not changed.
As shown in fig. 6, the present invention provides an access point control system of a rail transit communication system, which may include:
an obtaining device 10, configured to obtain first user quantity information of an access point of each cell accessing a user at a current time and second user quantity information of an access point accessing the user at a previous time;
each cell at least comprises one access point, and the access points are linearly distributed according to the characteristics of a rail transit scene and are obviously different from planar distribution in a public mobile communication system. When moving, the user generally moves along the track traffic. The schematic diagrams of the rail transit system and the public mobile communication system are respectively shown in fig. 2 and fig. 3. Fig. 2 shows the situation when 2 cells each contain 2 access points. At time T0, the user moves to cell 1, access point 1, at time T1, the user moves to cell 1, access point 0, at time T2, the user moves to cell 0, access point 1, at time T3, the user moves to cell 0, access point 0.
In the device, the first user quantity information and the second user quantity information accessed by each access point of each cell are respectively counted, and the time of each cell is kept synchronous during counting. In one embodiment, the network architecture of the access point control system is as shown in fig. 4, in this case, the first user number information and the second user number information may be obtained by the signal transmission control node directly receiving information sent from each cell, or may be obtained by the signal transmission control node receiving intermediate node forwarding information forwarded to information about the number of users accessed by each access point of the cell and sent by each cell. In an embodiment, when the number of access users of the access point changes, each cell may upload the first user number information and the second user number information corresponding to the access point of the cell to the signal transmission control node, or each cell may send the first user number information and the second user number information corresponding to the access point of the cell to the signal transmission control node according to a preset frequency.
In one embodiment, a network architecture of the access point control system is as shown in fig. 5, in which case, each access point may count first user quantity information and second user quantity information of users accessed by itself and send the information to other cells. For each cell, the access points may be divided into a first group of access points and a second group of access points, where the first group of access points is the access points in the cell, and the second group of access points is the access points other than the first group of access points. When each cell receives the first user quantity information and the second user quantity information sent by the second group of access points, the cell corresponding to the second group of access points can directly receive the information, and the cell can also receive the information forwarded by a third party. In addition, when the cell receives the first user number information and the second user number information of the first group of access points, the cell can directly receive the user number information which is sent by the internal access user management module and accessed by the first group of access points. In an embodiment, when the number of access users of the access point changes, each cell may upload the first user number information and the second user number information corresponding to the access point of the cell to other cells, or each cell may send the first user number information and the second user number information corresponding to the access point of the cell to other cells according to a preset frequency.
A first control device 20, configured to determine, according to first user quantity information and second user quantity information corresponding to each access point, a current access point to which a user migrates at a current moment, determine, as an associated access point of the current access point, at least one access point that is adjacent to the current access point in a user movement direction, and control a signal transmission state of the associated access point to an on state;
an establishing unit may be used to establish a history access record table, and store the counted first user quantity information and second user quantity information in the history access record table. The history access record table should include at least two recorded information of time (current time and last time). To facilitate analytical comparisons, the individual access points in the historical access record table may be ordered by physical proximity. Specifically, the historical access record table may include identification information of each cell, identification information of an access point of each cell, first user quantity information of each access point accessing a user at a current time, and second user quantity information of each access point accessing the user at a previous time; and a control unit is also adopted and used for determining the current access point to which the user migrates at the current moment according to the historical access record table. The cell identification information may be a cell ID or other information that uniquely identifies a cell, and similarly, the access point identification information may be information that uniquely identifies an access point. The historical access record table can be established by a signal transmission control node and can also be established by a control cell.
Specifically, the current access point may be determined according to the following several ways:
the first method is as follows:
if the number of the access users of the first access point at the last moment is smaller than a preset first threshold value and the number of the access users of the first access point at the current moment is larger than a preset second threshold value, determining that the first access point is the current access point; wherein the first threshold value is less than or equal to the second threshold value. In an embodiment, both the first threshold and the second threshold are set to 0, in this case, if the number of users accessed by the first access point at the previous time is zero and the number of users accessed by the first access point at the current time is not zero, it is determined that the first access point is the current access point.
The second method comprises the following steps:
and if the difference value between the number of the access users of the first access point at the current moment and the number of the access users of the adjacent access points at the current moment is larger than a preset third threshold value, judging that the first access point is the current access point.
After determining the current access point, an associated access point may be determined according to the following: determining the user movement direction according to the original access point to which the user has migrated at the previous moment and the current access point; setting at least one access point which is adjacent to the current access point in the moving direction of the user as an associated access point of the current access point.
For example, for the first mode, if the number of users accessed by the access point N at time T (m) is smaller than a preset threshold 1, and the number of users accessed at time T (m +1) is greater than a preset threshold 2, it is determined that the access user migrates between the access point (N-1) and the access point N, where the current access point is the access point N, and at this time, at least one access point from the access point (N +1) (including the access point (N +1)) is determined as an associated access point; the method for determining the access point (N-1) comprises the steps that when the user is judged to move into the access point N at the moment T (m +1), the time T (m +1) is searched forward according to the time dimension, the access point which is accessed by the user and is not accessed by the access point N at the last time is determined as the access point (N-1), correspondingly, the time T (m +1) is searched backward according to the time dimension, and one access point which is adjacent to the access point N is determined as the access point (N + 1).
For the special case of the first mode, if the number of access users is not available at the time of T (m) by the access point N, and if the number of access users is available at the time of T (m +1), it is determined that the access users migrate between the access point (N-1) and the access point N, where the current access point is the access point N, and at least one access point from the access point (N +1) (including the access point (N +1)) is determined as an associated access point; the method for determining the access point (N-1) comprises the steps that when the user is judged to move into the access point N at the moment T (m +1), the time T (m +1) is searched forward according to the time dimension, the access point which is accessed by the user and is not accessed by the access point N at the last time is determined as the access point (N-1), correspondingly, the time T (m +1) is searched backward according to the time dimension, and one access point which is adjacent to the access point N is determined as the access point (N + 1).
And in the second mode, at the time T (m), if the number of users accessed by the access point N is greater than the number of users accessed by the access point (N-1) by more than the threshold 3, determining that the access users migrate between the access point (N-1) and the access point N, and determining at least one access point from the access point (N +1) (including the access point (N +1)) as an associated access point. The access point (N-1) is determined by searching forward from the time T (m) according to the time dimension when the time T (m) determines that the user moves into the access point N, determining the access point which has the access of the user except the access point N for the last time as the access point (N-1), and correspondingly, determining an access point which is adjacent to the access point N and searched backward from the time T (m) according to the time dimension as the access point (N + 1).
After determining the current node and the associated node, directly communicating with the associated access point through a signal transmission control node or a control cell to start signal transmission of the access point; or, the cell to which the associated access point belongs may be notified by the signal transmission control node or the control cell to control the associated access point to start signal transmission.
And a second control device 30, configured to send a control signal to the associated access point if the duration of the zero number of access users of the associated access point reaches a preset time threshold, and control a signal transmission state of the associated access point to be switched from an on state to an off state.
The preset time threshold may be set according to an actual situation, for example, according to a moving speed of a user, and when the moving speed of the user is fast, the preset time threshold may take a smaller value; conversely, when the moving speed of the user is slow, the preset time threshold may take a larger value.
The access point can be directly communicated with the associated access point through a signal transmission control node or a control cell so as to close the signal transmission of the access point; or, the cell to which the associated access point belongs may be notified by the signal transmission control node or the control cell to control the associated access point to turn off signal transmission.
The technical solution of the present invention will be described below with reference to specific examples.
Example one
In the present embodiment, a network architecture as shown in fig. 4 is adopted. As shown in fig. 2, the present track traffic coverage system is composed of two cells, each of which includes two access points, i.e., cell 0 access point 0, cell 0 access point 1, cell 1 access point 0, and cell 1 access point 1. In this embodiment, signal transmission on and off of four access points, that is, a cell 0 access point 0, a cell 0 access point 1, a cell 1 access point 0, and a cell 1 access point 1, are controlled as an example, if this embodiment is used to send, by each cell, access user number information of each access point in this cell according to a preset frequency, and in this embodiment, a user history access record table is stored according to two times, and if this embodiment has configuration information of migration between two preset access points and associated access points as in table 1. The user history access record table in the signal emission control node needs to store the access user conditions of four access points, namely cell 0 access point 0, cell 0 access point 1, cell 1 access point 0 and cell 1 access point 1.
At the time of T0, cell 1 sends information that the number of users accessed by cell 1 access point 0 in this cell is 0 and the number of users accessed by cell 1 access point 1 is 20 to a signal transmission control node, cell 0 sends information that the number of users accessed by cell 0 access point 0 in this cell is 0 and the number of users accessed by cell 0 access point 1 is 0 to the signal transmission control node, and the signal transmission control node, after receiving the information, stores the information of the number of users accessed by these four access points, specifically as table 2, since the information in the user history access record table at the current time does not have the migration relationship in table 1, and there is no situation that an access point is in the state of opening transmission signal but the number of users accessed becomes 0, it is not necessary to change the signal transmission state of each access point in cell 0 and cell 1;
at time T1, cell 1 sends information that the number of users accessed by cell 1 access point 0 in this cell is 20 and the number of users accessed by cell 1 access point 1 is 0 to the signal transmission control node, cell 0 sends information that the number of users accessed by cell 0 access point 0 in this cell is 0 and the number of users accessed by cell 0 access point 1 is 0 to the signal transmission control node, and the signal transmission control node updates its own user history access record table, such as table 3, after receiving the above information. According to the first method in the preceding claims (if the first method is adopted to determine that the number of access users moves between access points in this embodiment), it can be determined at time T1 that an access user moves from access point 1 to access point 0 in cell 1, and therefore, it can be known according to table 1 that cell 0 must start signal transmission associated with access point cell 0 access point 1, and since there is a situation that access point 1 in cell 1 is in a state of starting signal transmission but the number of access users becomes 0 at the current time, it is assumed that after this situation is determined according to this embodiment, the time threshold value is 0, the signal transmission control node immediately notifies cell 1 to stop signal transmission of access point 1 in cell 1. The signal emission states of other access points do not need to be updated;
at time T2, cell 1 sends information that the number of users accessed by cell 1 access point 0 in this cell is 0 and the number of users accessed by cell 1 access point 1 is 0 to the signal transmission control node, cell 0 sends information that the number of users accessed by cell 0 access point 0 in this cell is 0 and the number of users accessed by cell 0 access point 1 is 20 to the signal transmission control node, and the signal transmission control node updates its own user history access record table, such as table 4, after receiving the above information. According to the first method in the preceding claims, it can be determined at time T2 that the access user moves from cell 1 to cell 0 through access point 0, so it can be known according to table 1 that cell 0 must start signal transmission associated with access point cell 0 and access point 0, and since there is a situation that the signal transmission state is started but the number of access users becomes 0 in access point 0 in cell 1 at the current time, it is assumed that the time threshold value is 0 after this situation is determined, the signal transmission control node immediately notifies cell 1 to stop signal transmission of access point 0 in cell 1. The signal emission states of other access points do not need to be updated;
at time T3, cell 1 sends information that the number of users accessed by cell 1 access point 0 in this cell is 0 and the number of users accessed by cell 1 access point 1 is 0 to the signal transmission control node, cell 0 sends information that the number of users accessed by cell 0 access point 0 in this cell is 20 and the number of users accessed by cell 0 access point 1 is 0 to the signal transmission control node, and the signal transmission control node updates its own user history access record table, such as table 5, after receiving the above information. At this time, the access user migration condition in table 1 is not satisfied, and therefore, it is not necessary to newly start any access point in the cell 0, but since the time T3 determines that the number of users accessed to the access point 1 in the cell 0 in the state of starting signal transmission is 0, assuming that the present embodiment has a threshold value 4 of 0 after judging the situation, the signal transmission control node immediately notifies the cell 0 to close the signal transmission of the access point 1 in the cell 0, and analogizes and completes the signal transmission control of each access point, it can be seen from the present embodiment that, for the track traffic coverage system, only the signal transmissions of two access points are started at the same time, the other access points are in the state of closing transmission, by using the method of the present invention, the track traffic coverage system only starts the signal transmissions of a plurality of access points around the associated access point, and the problem of serious spectrum interference with the track traffic coverage system due to continuous transmission of signals along the track traffic line in, the frequency spectrum quality is effectively improved.
Table 1 migration relationship and associated access point configuration information between preset access points in cell 0
| Access point (N-1) | Access point N | Associating |
| Cell | ||
| 1 |
|
Cell 0 |
| |
Cell 0 |
Cell 0 access point 0 |
TABLE 2T 0 time cell 0 subscriber History Access Table information
| Number/time of access point users | T0 | |
| Number of 1 users of access point in |
20 | |
| |
0 | |
| Cell 0 |
0 | |
| Cell 0 access point 0 user number | 0 |
| Number/time of access point users | T0 | T1 |
| Number of 1 users of access point in |
20 | 0 |
| |
0 | 20 |
| Cell 0 |
0 | 0 |
| Cell 0 access point 0 user number | 0 | 0 |
TABLE 4T 2 time cell 0 subscriber History Access Table information
| Number/time of access point users | T1 | T2 |
| Number of 1 users of access point in |
0 | 0 |
| |
20 | 0 |
| Cell 0 |
0 | 20 |
| Cell 0 access point 0 user number | 0 | 0 |
TABLE 5T 3 time cell 0 subscriber History Access Table information
| Number/time of access point users | T2 | T3 |
| Number of 1 users of access point in |
0 | 0 |
| |
0 | 0 |
| Cell 0 |
20 | 0 |
| Cell 0 access point 0 user number | 0 | 20 |
Example two
The present embodiment employs a network architecture as shown in fig. 5. As shown in fig. 2, the track traffic coverage system is composed of two cells, each cell includes two access points, i.e., a cell 0 access point 0, a cell 0 access point 1, a cell 1 access point 0, and a cell 1 access point 1, in this embodiment, signal transmission control of each access point of the cell 0 is taken as an example for explanation, if this embodiment is used, each cell sends information of the number of access users of each access point in the cell according to a preset frequency, and in this embodiment, a user history access record table is stored according to two moments, and if there is configuration information of migration and associated access points between two preset access points in the cell 0, as shown in table 1. The user history access record table in the cell 0 needs to store the access user conditions of the four access points, namely the cell 0 access point 0, the cell 0 access point 1, the cell 1 access point 0 and the cell 1 access point 1.
At time T0, cell 1 sends information that the number of users accessed by cell 1 access point 0 under the cell is 0 and the number of users accessed by cell 1 access point 1 is 20 to the cell and surrounding cells, cell 0 sends information that the number of users accessed by cell 0 access point 0 under the cell is 0 and the number of users accessed by cell 0 access point 1 is 0 to the cell and surrounding cells, after receiving the information, cell 0 stores the access user number information of the four access points, specifically table 2, because the user history access record table of cell 0 needs to pay attention to cell 1 access point 1, cell 1 access point 0, cell 0 access point 1, and cell 0 access point 0, the number of access users of the access points that are not in the state of table 1 at the current time does not have the migration relationship in the user history access record table, and the number of access users of access points that are not in the state of starting transmission signal of the cell 0 becomes 0, therefore, the signal transmission states of two access points under the cell 0 do not need to be changed;
at time T1, cell 1 transmits to its own cell and its neighboring cells the information that the number of users accessed by cell 1 access point 0 is 20 and the number of users accessed by cell 1 access point 1 is 0, cell 0 transmits to its own cell and its neighboring cells the information that the number of users accessed by cell 0 access point 0 is 0 and the number of users accessed by cell 0 access point 1 is 0, and cell 0 updates its own user history access record table, as shown in table 3, after receiving the above information. According to the first method in the preceding claims (if the first method is adopted to determine that the number of access users moves between the access points), T1 can determine that the access user moves from the access point 1 in the cell 1 to the access point 0 in the cell 1, so it can be known according to table 1 that the cell 0 must start the signal transmission of the access point 1 associated with the access point cell 0, and since the number of access users of the access point which is not in the state of starting the signal transmission in the current cell becomes 0, there is no need to change the signal transmission state of other access points in the current cell;
at time T2, cell 1 transmits information that the number of users accessed by cell 1 access point 0 in this cell is 0 and the number of users accessed by cell 1 access point 1 is 0 to this cell and its neighboring cells, cell 0 transmits information that the number of users accessed by cell 0 access point 0 in this cell is 0 and the number of users accessed by cell 0 access point 1 is 20 to this cell and its neighboring cells, and cell 0 updates its own user history access record table, as shown in table 4, after receiving the above information. According to the first method claimed in the preceding claims, it can be determined at time T2 that the access user moves from cell 1 to cell 0 through access point 0, so it can be known according to table 1 that cell 0 must start the signal transmission of access point 0 associated with access point cell 0, and since the number of access users that are not in the state of starting the signal transmission in this cell at the present time becomes 0, there is no need to change the signal transmission state of other access points in this cell;
at time T3, cell 1 transmits information that the number of users accessed by cell 1 access point 0 in this cell is 0 and the number of users accessed by cell 1 access point 1 is 0 to this cell and its neighboring cells, cell 0 transmits information that the number of users accessed by cell 0 access point 0 in this cell is 20 and the number of users accessed by cell 0 access point 1 is 0 to this cell and its neighboring cells, and cell 0 updates its own user history access record table, as shown in table 5, after receiving the above information. At this time, the access user migration condition in table 1 is not satisfied, and therefore, it is not necessary to newly start any access point in the cell 0, but since it is determined at time T3 that the number of users accessed to the access point 1 in the cell 0 in the state of starting signal transmission is 0, assuming that the present embodiment has a threshold value of 4 of 0 after determining the situation, the cell 0 immediately closes signal transmission of the access point, and analogizes the signal transmission control of each access point, and similarly, the cell 1 also completes signal transmission control of each access according to the rules of the present embodiment, as can be seen from the present embodiment, for the track traffic coverage system, signal transmission of only two access points is started at the same time, signal transmission of a plurality of access points around the associated access point is started by using the method of the present invention, the problem of serious frequency spectrum interference with a common frequency or adjacent frequency of a rail transit coverage system caused by continuous emission of signals along the rail transit in a large range can be avoided, and the frequency spectrum quality is effectively improved.
According to the access point control method and the access point control system of the rail transit communication system, when the access point has user access, the signal transmitting state of the associated access point of the access point is controlled to be in the open state, and when the associated access point does not have user access for a period of time, the signal transmitting state of the associated access point is controlled to be switched from the open state to the closed state, so that the problem that the signal along the rail transit is continuously transmitted in a large range to cause the frequency spectrum interference with the rail transit coverage system to be serious can be avoided, and the frequency spectrum quality is effectively improved.
The access point control system of the rail transit communication system and the access point control method of the rail transit communication system are in one-to-one correspondence, and technical features and beneficial effects described in the embodiment of the access point control method of the rail transit communication system are applicable to the embodiment of the access point control system of the rail transit communication system, so that the statement is made.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An access point control method of a rail transit communication system, which is applied to a signal transmission control node, is characterized by comprising the following steps:
acquiring first user quantity information of access users of access points of all cells at the current moment and second user quantity information of the access users at the last moment; each cell comprises at least one access point;
determining a current access point to which a user migrates at the current moment according to first user quantity information and second user quantity information corresponding to each access point, determining at least one access point which is adjacent to the current access point in the user movement direction as an associated access point of the current access point, and controlling the signal transmission state of the associated access point to be an open state;
and if the duration time of the number of the access users of the associated access point reaches a preset time threshold, sending a control signal to the associated access point, and controlling the signal transmission state of the associated access point to be switched from an open state to a closed state.
2. The access point control method of the rail transit communication system according to claim 1, wherein each cell uploads first user quantity information and second user quantity information corresponding to the access point of the cell when the number of access points accessing users changes; or
And each cell uploads first user quantity information and second user quantity information corresponding to the cell access point according to a preset frequency.
3. The method for controlling access points of a rail transit communication system according to claim 1, wherein the step of determining a current access point to which a user migrates at a current moment according to the first user quantity information and the second user quantity information corresponding to each access point comprises:
establishing a history access record table sent by each cell; the historical access record table comprises identification information of each cell, identification information of access points of each cell, first user quantity information of access points accessing users at the current moment and second user quantity information of access users at the last moment;
and determining the current access point to which the user migrates at the current moment according to the historical access record table.
4. The method for controlling access points of a track traffic communication system according to claim 1, wherein the step of determining the current access point to which the user has migrated at the current time according to the first user quantity information and the second user quantity information corresponding to each access point further comprises:
if the number of the access users of the first access point at the last moment is smaller than a preset first threshold value and the number of the access users of the first access point at the current moment is larger than a preset second threshold value, determining that the first access point is the current access point; wherein the first threshold value is less than or equal to the second threshold value.
5. The method for controlling access points of a rail transit communication system according to claim 4, wherein the step of determining the current access point to which the user has migrated at the current time according to the first user amount information and the second user amount information corresponding to each access point comprises:
and if the number of the access users of the first access point at the last moment is zero and the number of the access users of the first access point at the current moment is not zero, determining that the first access point is the current access point.
6. The method for controlling access points of a track traffic communication system according to claim 1, wherein the step of determining the current access point to which the user has migrated at the current time according to the first user quantity information and the second user quantity information corresponding to each access point further comprises:
and if the difference value between the number of the access users of the first access point at the current moment and the number of the access users of the adjacent access points at the current moment is larger than a preset third threshold value, judging that the first access point is the current access point.
7. The access point control method of the rail transit communication system according to any one of claims 4 to 6, wherein the step of setting at least one access point which is adjacent to the current access point in a user moving direction as an associated access point of the current access point comprises:
determining the user movement direction according to the original access point to which the user has migrated at the previous moment and the current access point;
setting at least one access point which is adjacent to the current access point in the moving direction of the user as an associated access point of the current access point.
8. An access point control system of a rail transit communication system, the system is applied to a signal emission control node, and the system is characterized by comprising:
the access point of each cell is used for accessing first user quantity information of users at the current moment and second user quantity information of the users at the last moment; each cell comprises at least one access point;
the first control device is used for determining a current access point to which a user migrates at the current moment according to first user quantity information and second user quantity information corresponding to each access point, determining at least one access point which is adjacent to the current access point in the user movement direction as an associated access point of the current access point, and controlling the signal transmission state of the associated access point to be in an open state;
and the second control device is used for sending a control signal to the associated access point and controlling the signal transmission state of the associated access point to be switched from the on state to the off state if the duration time of the number of the associated access point accessing the users reaches a preset time threshold.
9. The access point control system of rail transit communication system of claim 8, wherein the obtaining module further obtains the first and second user amount information by:
when the number of access users of each cell is changed, uploading first user number information and second user number information corresponding to the access point of the cell; or
And each cell uploads first user quantity information and second user quantity information corresponding to the cell access point according to a preset frequency.
10. The access point control system of the rail transit communication system according to claim 8, wherein the first control means includes:
the establishing unit is used for establishing a historical access record table sent by each cell; the historical access record table comprises identification information of each cell, identification information of access points of each cell, first user quantity information of access points accessing users at the current moment and second user quantity information of access users at the last moment;
and the control unit is used for determining the current access point to which the user migrates at the current moment according to the historical access record table.
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