CN113840258B - Self-adaptive cell switching method and device for rail transit train system - Google Patents
Self-adaptive cell switching method and device for rail transit train system Download PDFInfo
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- CN113840258B CN113840258B CN202010580612.8A CN202010580612A CN113840258B CN 113840258 B CN113840258 B CN 113840258B CN 202010580612 A CN202010580612 A CN 202010580612A CN 113840258 B CN113840258 B CN 113840258B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/36—Reselection control by user or terminal equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a self-adaptive cell switching method and device of a rail transit train system, which are used for determining the traveling direction and the train direction of a train; the mobile station sends the travelling direction and the train direction to the base station, and receives switching parameters issued by the base station; the switching parameters comprise a received signal strength threshold and a timing advance threshold of a source cell; and the mobile station periodically detects the received signal strength and timing advance of the source cell, and performs cell switching according to the switching parameters.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a self-adaptive cell switching method and device of a rail transit train system.
Background
Handoff refers to the process of changing the original channel to a new channel to continue communication when a mobile station moves from one coverage area of a base station to another coverage area of the base station during communication or when communication quality is degraded due to external interference. At present, whether cell switching is performed is generally judged according to three modes of radio frequency signal intensity, carrier-to-interference ratio and relative position from a mobile station to a base station in a rail transit train system.
1. Judging according to the radio frequency signal intensity: the intensity of the radio frequency signal directly reflects the quality of communication quality, the base station receiver continuously measures the mobile station, the control unit compares the measured value with a threshold value, and whether to send a switching request is determined according to the comparison result.
2. And judging according to the carrier-to-interference ratio of the received signal: the carrier-to-interference ratio is the ratio of the average power of the carrier signal and the interference signal received by the receiver, reflects the communication quality of mobile communication, and when the carrier-to-interference ratio received by the receiver is smaller than a specified threshold value, the system starts a switching process.
3. According to the distance judgment from the mobile station to the base station: in general, since a mobile station moves into the coverage area of a neighboring cell, a decision as to whether or not to perform a handover can be made based on the distance between the mobile station and a base station and between the mobile station and the neighboring cell, and when the distance is greater than a predetermined value, a handover request is issued.
Any one of the three decision conditions can be satisfied to initiate the handover procedure. However, in practical application, since it is difficult to measure the carrier-to-interference ratio of the received signal during the communication process, and it is difficult to ensure the measurement accuracy when using distance judgment, most mobile communication systems use the radio frequency signal strength as the reference for judging whether to switch or not. The switching process based on signal strength is as follows: the signal strength received from the two cells changes continuously as the mobile station moves from the current cell to the neighboring cell. On the one hand, as the mobile station gradually approaches the boundary of the current cell, the signal strength and quality gradually deteriorate, and the signal strength from the adjacent cell from a certain point is higher than that of the current cell; on the other hand, the signal strength received by the mobile station by the neighboring cell is also higher than the signal strength received by the current cell. Communication is handed over to a neighboring cell before the communication link between the mobile station and the current cell has deteriorated to be unusable or when the signal strength of the neighboring cell is higher than the signal strength of the current cell by a certain value.
According to the above-mentioned switching method, the communication system, whether the base station or the mobile station, needs to be frequently measured to determine whether the switching can be performed, and the switching process also involves complex signaling interaction between the base station and the mobile station and between the base stations, thereby occupying system resources and having great switching delay.
Disclosure of Invention
In view of this, the invention provides a method and a device for switching self-adaptive cells of a rail transit train system, when the received signal strength and timing advance meet the switching conditions, a mobile station autonomously initiates measurement switching, and by the parameter integral value self-adaptive judgment of the travelling direction and the train direction, the received signal strength and the timing advance can be accurately obtained to meet the switching threshold, the success rate of system switching is improved, resources are saved to the greatest extent, and the efficiency is improved.
An adaptive cell switching method of a rail transit train system, comprising:
determining the traveling direction of a train and the train direction; the travel direction includes: running in the direction of the terminal station and running in the direction of the starting station; the train direction includes: the front end of the train is a preset cockpit during traveling, and the rear end of the train is a preset cockpit during traveling;
The predetermined cockpit is used for identifying the position of the mobile station arranged at the predetermined cockpit end: the front end of the train is a preset cockpit during traveling, and the mobile station is positioned at the train head; the rear end of the train is a preset cockpit during traveling, and the mobile station is positioned at the tail of the train;
the mobile station sends the travelling direction and the train direction information to the base station and receives switching parameters sent by the base station; the switching parameters comprise a received signal strength threshold and a timing advance threshold of a source cell;
and the mobile station periodically detects the received signal strength and timing advance of the source cell, and performs cell switching according to the switching parameters.
When the received signal strength and timing advance of a source cell where a mobile station is located meet the switching conditions, measuring neighbor cells, sequentially measuring the received signal strength of each neighbor cell, and selecting a target cell for switching;
determining a dynamic state of the mobile station; the movement state includes: a preparation state, wherein the preparation state is close to the base station and far away from the base station;
the mobile station periodically tests the current timing advance and calculates the difference between the current timing advance and the earlier timing advance;
and determining the moving state of the mobile station according to the current moving state of the mobile station, the difference value of the current timing advance and the earlier timing advance and the moving state change threshold.
The method comprises the steps that three parameters of an effective moving state, a moving direction and a train direction of a mobile station meet a preset corresponding relation, and when the three parameters do not meet the preset corresponding relation, at least one parameter judging result is wrong; the effective movement state of the mobile station includes: a base station is close to and far away from;
the preset corresponding relation is as follows:
the mobile station is far away from the base station, the traveling direction is the direction of the terminal station, and the front end of the train is a preset cockpit when the train travels;
the mobile station is far away from the base station, the traveling direction is the direction of traveling to the starting station, and the train direction is the predetermined cockpit at the rear end of the train when traveling;
the mobile station is close to the base station, the traveling direction is the direction of the terminal station, and the rear end of the train is a preset cockpit when the train travels;
the mobile station is close to the base station, the traveling direction is the direction of the starting station, and the front end of the train is a preset cockpit when the train travels.
Further, judging the direction of the train and the travelling direction by a parameter integration method, calculating a parameter integral value of the direction of the train and calculating a parameter integral value of the travelling direction;
the calculating of the train direction parameter integral value includes:
initially powering on, wherein the front end of the train is a preset cockpit when the train runs, and the integral value of the train direction parameter is 0;
When the mobile station continuously accesses the network for the same base station twice and the TA difference value of the timing advance is larger than a preset TA threshold, verifying whether the current train direction meets a preset corresponding relation, adding 1 to the train direction parameter integral value when the current train direction meets the preset corresponding relation, and subtracting 1 from the train direction parameter integral value when the current train direction does not meet the preset corresponding relation.
The calculating of the traveling direction parameter integrated value includes:
when a mobile station enters an anchoring station, determining the traveling direction of a train by an anchoring station method, wherein the parameter integral value of the traveling direction is the maximum value M;
the anchoring station is a starting point base station or an ending point base station;
when a mobile station enters a network starting point base station, the traveling direction is the direction running towards a terminal station;
when the mobile station enters the network terminal base station, the traveling direction is to run towards the direction of the starting station.
When a mobile station enters a non-anchor station:
when the mobile station continuously accesses to different base stations for two times, and the Media Access Control (MAC) addresses of the two base stations accessed to the network for two times accord with the network access sequence of the current traveling direction, the current traveling direction is unchanged, and the parameter integral value of the traveling direction is the maximum value M;
when the mobile station continuously accesses to different base stations for two times and the Media Access Control (MAC) addresses of the two base stations accessed to the network for two times do not accord with the network access sequence of the current traveling direction, the current traveling direction is wrong, the current traveling direction is modified, and the traveling direction parameter integral value is the maximum value M;
When the mobile station continuously accesses the same base station twice and the TA difference value of the twice timing advance is larger than a preset TA threshold, verifying whether the current traveling direction meets a preset corresponding relation, adding 1 to the parameter integral value of the traveling direction when the current traveling direction is met, and subtracting 1 from the parameter integral value of the traveling direction when the current traveling direction is not met;
when only one integral value in the two parameters is negative, determining that the parameter direction of which the integral value is negative is wrong, and modifying;
when the two parameter integral values are both negative numbers and the travelling direction parameter integral value is not larger than the train direction parameter integral value, determining that the current travelling direction is wrong, and modifying the travelling direction;
when the two parameter integral values are both negative numbers and the travelling direction parameter integral value is larger than the train direction parameter integral value, the current train direction error is judged, and the train direction is modified.
The invention also provides a self-adaptive cell switching device of the rail transit train system, which comprises:
the determining module is used for determining the traveling direction of the train and the direction of the train; the advancing direction comprises the direction of the terminal station and the direction of the starting point; the train direction includes: the front end of the train is a preset cockpit during traveling, and the rear end of the train is a preset cockpit during traveling; the predetermined cockpit is used for identifying the position of the predetermined cockpit-end mobile station: the front end of the train is a preset cockpit during traveling, and the mobile station is positioned at the train head; the rear end of the train is a preset cockpit during traveling, and the mobile station is positioned at the tail of the train;
The communication module is used for sending the advancing direction and the train direction to the base station and receiving switching parameters issued by the base station; the switching parameters comprise a received signal strength threshold and a timing advance threshold of a source cell;
the measuring module is used for detecting the received signal strength indication and the timing advance of the source cell;
the measuring module is further used for measuring neighbor cells when the received signal strength and timing advance of the source cell meet the switching conditions, and sequentially measuring the received signal strength of each neighbor cell;
and the selection module is used for selecting the target cell to switch.
The determining module includes:
a first determining unit configured to determine a movement state of the mobile station;
and determining the moving state of the mobile station according to the current moving state of the mobile station, the difference value of the current timing advance and the earlier timing advance and the state change threshold.
The determining module includes:
a second determining unit for determining a train direction and a traveling direction according to the parameter integral value, comprising:
a first calculation subunit for calculating a train direction parameter integration value, comprising:
initially powering on, wherein the front end of the train is a preset cockpit when the train runs, and the integral value of the train direction parameter is 0;
When cell switching occurs, the mobile station accesses to a new base station, verifying whether the currently determined train direction meets a preset corresponding relation, adding 1 to the train direction parameter integral value when the currently determined train direction meets the preset corresponding relation, and subtracting 1 from the train direction parameter integral value when the currently determined train direction does not meet the preset corresponding relation;
when the mobile station is reconnected to the network, the integral value of the train direction parameter is unchanged when the mobile station is reconnected to the same base station; and subtracting 1 from the integral value of the train direction parameter when the reconnection network is connected to different base stations.
A second calculation subunit for calculating a traveling direction parameter integrated value:
when the power is initially applied, the traveling direction is the traveling direction towards the terminal, and the parameter integral value of the traveling direction is 0;
when the cell switching occurs and the mobile station enters the network anchoring station, the parameter integral value of the travelling direction is the maximum value M;
when cell switching occurs, the mobile station accesses to the non-anchor station, verifying whether the currently determined travelling direction meets a preset corresponding relation, adding 1 to the travelling direction parameter integral value when the currently determined travelling direction meets the preset corresponding relation, and subtracting 1 from the travelling direction parameter integral value when the currently determined travelling direction does not meet the preset corresponding relation;
when the mobile station is re-connected to the network, the integral value of the travelling direction parameter is unchanged when the mobile station is re-connected to the same base station; and subtracting 1 from the integral value of the travelling direction parameter when the reconnection network is accessed to different base stations.
The third determining subunit is configured to determine a traveling direction and a train direction according to the calculation results of the first calculating subunit and the second calculating subunit:
When any one of the two parameters has a negative integral value, modifying the parameter direction of the integral value as the negative value;
when the train direction parameter integral value and the travelling direction parameter integral value are the same negative value, comparing the magnitude of the two parameter integral values, judging that the parameter direction with smaller integral value is wrong, and modifying;
and when the train direction parameter integral value and the traveling direction parameter integral value are the same as negative values and are equal to each other, modifying the traveling direction.
The method comprises the steps that three parameters of an effective moving state, a moving direction and a train direction of a mobile station meet a preset corresponding relation, and when the three parameters do not meet the preset corresponding relation, at least one parameter judging result is wrong; the active movement state includes: a base station is close to and far away from;
the preset corresponding relation is as follows:
the mobile station is far away from the base station, the traveling direction is the direction of the terminal station, and the front end of the train is a preset cockpit when the train travels;
the mobile station is far away from the base station, the traveling direction is the direction of traveling to the starting station, and the train direction is the predetermined cockpit at the rear end of the train when traveling;
the mobile station is close to the base station, the traveling direction is the direction of the terminal station, and the rear end of the train is a preset cockpit when the train travels;
The mobile station is close to the base station, the traveling direction is the direction of the starting station, and the front end of the train is a preset cockpit when the train travels.
The invention has the beneficial effects that:
1. the self-adaptive cell switching method and the self-adaptive cell switching device of the rail transit train system, which are provided by the invention, do not adopt the switching strategy of the traditional cellular mobile communication system, and the mobile station automatically initiates measurement switching, so that complex signaling interaction between the mobile station and the base station is not needed, and the switching efficiency can be greatly improved;
2. in the invention, the mobile station automatically initiates measurement switching, the mobile station does not frequently initiate measurement, and the measurement switching is performed only when the received signal strength and the timing advance reach the switching threshold, so that the resources can be saved to the greatest extent;
3. according to the parameter integration method and the preset corresponding relation provided by the invention, the train direction and the traveling direction are determined, and the train direction and the traveling direction can be rapidly and accurately determined, so that the accuracy of system switching is improved.
To the accomplishment of the foregoing and related ends, the one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings, the disclosed embodiments are intended to include all such aspects and their equivalents.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a flowchart of an adaptive handover method according to a first embodiment of the present invention;
fig. 1a is a schematic diagram of a handover of two mobile stations on a train according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a measurement switching flow according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a mobile station movement state change according to a second embodiment of the present invention;
FIG. 4 is a flowchart of a parameter integration method for calculating STADIR according to a fourth embodiment of the invention;
FIG. 5 is a flowchart of calculating DIADIR by the parameter integration method according to the fifth embodiment of the invention;
FIG. 6 is a diagram of an adaptive switching device according to a sixth embodiment of the present invention;
fig. 7 is a schematic diagram of a determining module according to a sixth embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. These embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The method is applied to the track traffic scene of linear lines such as high-speed railways or subways, and measurement switching is automatically initiated by a mobile station on a train, so that the mobile station can not frequently initiate measurement in order to save resources to the maximum extent, and measurement switching is initiated when the received signal strength RSSI (Received Signal Strength Indication) and the timing advance TA (Timing Advance) reach a switching threshold; for different traveling directions DRDIR and train directions STADIR, the RSSI/TA switching standards are different, the switching threshold is determined by the traveling directions DRDIR (Driving Direction) and the train directions STADIR (Station Direction), the mobile station automatically performs measurement switching according to the received RSSI threshold and the received TA threshold, and the switching process does not need the participation of a base station.
Example 1
The first embodiment of the invention provides a self-adaptive cell switching method of a rail transit train system, as shown in fig. 1, comprising the following steps:
step S1: determining a traveling direction DRDIR and a train direction STADIR of a train;
the travel direction includes: running in the direction of the terminal station and running in the direction of the starting station;
The train direction includes: the front end of the train is a predetermined cockpit during traveling and the rear end of the train is a predetermined cockpit during traveling.
The two ends of the train are cabins and can run bidirectionally, the definitions of the head and the tail are different according to different running directions, and in order to ensure the communication quality, two mobile stations are arranged on the train and are used for communicating with a base station, and one mobile station is respectively arranged at the position close to the cabins at the two ends of the train;
in order to ensure that each mobile station is allocated as much bandwidth as possible, the switching strategy in the invention is that one base station only has one mobile station to enter the network at the same time, so that the position of the mobile station on the train needs to be identified to accurately determine whether to switch or not;
as shown in fig. 1a, a train moves to a position 1, a mobile station 1 near the head of the train enters a network base station B to communicate, a mobile station 2 near the tail of the train enters the network base station a to communicate, whether cell switching is performed or not is closely related to the mobile station in the invention, and whether cell switching is performed or not for the mobile station 1 is related to the position of the mobile station 1 and the travelling direction of the train;
in order to explain how to switch, the preset cabins provided by the invention distinguish cabins at two ends of the train and identify the positions of the mobile stations on the train; one of cabins at two ends of the train is arbitrarily defined as a preset cab, a mobile station positioned near the preset cab end is a first mobile station, and the preset cab can identify the position of the mobile station on the train because the mobile station is arranged at a position close to the cab:
The front end of the train is a preset cockpit during traveling, and the first mobile station is positioned at the train head;
the rear end of the train is a preset cockpit during traveling, and the first mobile station is positioned at the tail of the train;
for the second mobile station arranged at the non-scheduled cockpit end of the train, the switching point is related to the position of the second mobile station and the running direction of the train, and the switching method is the same as that of the first mobile station, and will not be described again.
The invention uses the first mobile station with the head as the preset cockpit end to describe the self-adaptive district switching method of the train system, the mobile station is the first mobile station; in rail transit systems, the predetermined cockpit is often designated as a small-size cockpit.
Step S2: the mobile station sends the travelling direction and the train direction information to the base station and receives switching parameters sent by the base station; the switching parameters comprise a received signal strength threshold and a timing advance threshold of a source cell;
after the DRDIR and STADIR of the mobile station are determined, the switching threshold can be uniquely determined, when the mobile station enters the network, the DRDIR and STADIR are reported to the base station, and the base station sends the corresponding switching parameter RSSI threshold and TA threshold to the mobile station according to the DRDIR and STADIR reported by the mobile station;
Further, the handover parameters further include neighbor cell information; the neighbor cell information includes: the number of the neighbor cells, the Media Access Control (MAC) address and the frequency point corresponding to each neighbor cell.
Step S3: the mobile station periodically detects the received signal strength and timing advance of the source cell, and selects a target cell for switching according to the switching parameters;
the mobile station periodically detects the RSSI and TA of the source cell to judge whether the RSSI and TA reach the switching parameter threshold, if the RSSI and TA do not reach the switching parameter threshold, any operation is not started, and therefore any resource is not occupied;
when the RSSI and TA of a source cell where a mobile station is located reach a switching parameter threshold, namely meet a switching condition, neighbor cell measurement is carried out, the received signal strength of each neighbor cell is measured in sequence, and a target cell is selected for switching;
in some alternative embodiments, as shown in fig. 2, when the RSSI and TA of the source cell reach the switching parameter threshold, if there is uplink and downlink data to be transmitted, the adjacent cell measurement is performed after the transmission and reception of the uplink and downlink data are preferentially completed;
specifically, switching to adjacent cell frequency to perform RSSI measurement, wherein the RSSI measurement result can be measured for several frames to obtain an average value or take an RSSI instantaneous value, so that the measurement result can be obtained in the fastest 1 frame;
Comparing the measured results of RSSIs of all adjacent cells to determine the optimal adjacent cell; and the optimal neighbor cell is the target cell for switching, if the switching is successful, the network is accessed to the target cell, and if the switching is failed, the network is retracted to the source cell.
The most critical factor for successful cell handover in a rail transit train system is the handover conditions acquired by the mobile station: namely, whether the RSSI threshold and the TA threshold are correct or not, and the decisive factors of whether the two thresholds are correct or not are the running direction of the train and the direction of the train.
Example two
The second embodiment of the invention provides a method for determining the movement state of a mobile station, which comprises the following steps:
the mobile station movement state MOSTATE (Moving State) refers to the movement mode of the mobile station relative to the base station, and has three modes of a ready state WAITING, a NEAR base station NEAR and a far base station FARWAY, when the mobile station just accesses the network base station, the mobile station is in the ready state, and the mobile state changes according to the difference of the distance between the mobile station and the base station;
Determining the moving state of the mobile station according to the current moving state of the mobile station, the difference value of the current timing advance and the earlier timing advance and the moving state change threshold;
the mobile station periodically tests the current timing advance Cur_ TA (Current Timing Advance) and calculates the difference delta TA between Cur_TA and the earlier timing advance Pre_ TA (Previous Timing Advance); determining the effective moving state of the mobile station according to the current moving state of the mobile station, the difference value delta TA and the moving state change threshold;
the early timing advance Pre_TA is the timing advance of the mobile station when the mobile station just accesses to the network base station;
the movement state change threshold includes: a first moving state change threshold thrd1 and a second moving state change threshold thrd2; the values of thrd1, thrd2 are set according to the specific system, wherein thrd1> thrd2;
determining whether the moving state of the mobile station changes according to the current moving state of the mobile station;
specifically, the movement state change chart is shown in fig. 3:
1) The current state is the ready state, i.e. when the mobile station has just entered the network base station,
ΔTA＝Cur_TA–Pre_TA，
when Δta > thrd1 is detected, the MOSTATE transitions from the ready state to a remote base station;
when ΔTA < -thrd1 is detected, the MOSTATE is shifted from the ready state to close to the base station;
When detecting that-thrd 1 is less than or equal to delta TA is less than or equal to thrd1, the moving state is unchanged, and the MOSTATE is still in a preparation state;
when the movement state changes, the early timing advance pre_ta=cur_ta; the movement state is unchanged and the early timing advance pre_ta is unchanged.
2) The current state is NEAR the base station NEAR
When Δta > thrd2 is detected, the MOSTATE becomes far from the base station;
when detecting that delta TA is less than or equal to thrd2, the MOSTATE movement state is unchanged;
when the movement state changes, the early timing advance pre_ta=cur_ta; the movement state is unchanged and the early timing advance pre_ta is unchanged.
3) The current state is far from the base station farray,
when ΔTA < -thrd2 is detected, the MOSTATE becomes close to the base station;
when detecting that the delta TA is more than or equal to-thrd 2, the MOSTATE movement state is unchanged;
when the movement state changes, the early timing advance pre_ta=cur_ta; the movement state is unchanged and the early timing advance pre_ta is unchanged.
Example III
The embodiment provides a method for judging a train traveling direction and a train direction, which comprises the following steps:
in the running process of the train, the situation that the moving state is the standby state WAITING is less, the moving state is the standby state only when the mobile station just enters the network base station, and the moving trend of the mobile station to the base station cannot be judged to be close or far away by the standby state; therefore, NEAR the base station NEAR, far from the base station far is the effective moving state of the mobile station;
On a linear line of a track traffic scene, through a large number of tests and summaries, the three parameters of the effective moving state, the advancing direction and the train direction of the mobile station are found to dynamically meet the preset corresponding relation, and when the three parameters do not meet the preset corresponding relation, at least one parameter judging result is wrong;
the preset corresponding relation is as follows:
the mobile station is far away from the base station, the traveling direction is the direction of the terminal station, and the front end of the train is a preset cockpit when the train travels;
the mobile station is far away from the base station, the traveling direction is the direction of traveling to the starting station, and the train direction is the predetermined cockpit at the rear end of the train when traveling;
the mobile station is close to the base station, the traveling direction is the direction of the terminal station, and the rear end of the train is a preset cockpit when the train travels;
the mobile station is close to the base station, the traveling direction is the direction of the starting station, and the front end of the train is a preset cockpit when the train travels.
The three variables in the preset corresponding relation are all dynamic changes and are possibly wrong, and as the movement state MOSTATE is changed according to the movement trend time of the distance base station and the movement state MOSTATE time change can be determined according to the change of TA in the step S11, when the three variables do not meet the preset corresponding relation, one of the DRDIR and STADIR is considered to be wrong, but under the condition that no external system input exists, the error is difficult to judge whether the error is the DRDIR or the STADIR error;
The embodiment provides an integral value judging method for determining which parameter is more accurate and reliable, carrying out parameter integration on DRDIR and STADIR and judging the reliability of the parameter, wherein the higher the integral value is, the higher the reliability of the integral value is, otherwise, the lower the integral value is, the lower the reliability of the integral value is, and when any one parameter integral value becomes negative, the direction of the parameter corresponding to the integral value is considered to be possibly wrong, and the parameter needs to be modified; in addition, the integral value judging method provided by the invention judges every frame, so that the direction and the travelling direction of the train can be accurately and rapidly determined.
Judging the direction and the travelling direction of the train through a parameter integration method, calculating a train direction parameter integral value and calculating a travelling direction parameter integral value;
when only one integral value in the two parameters is negative, determining that the parameter direction of which the integral value is negative is wrong, and modifying;
when the two parameter integral values are both negative numbers and the traveling direction parameter integral value is not larger than the train direction parameter integral value, the current traveling direction is judged to be wrong, and the traveling direction is modified.
Example IV
The present embodiment provides a method for calculating a parameter integral value of a train direction STADIR, and a flowchart is shown in fig. 4, including:
Initially powering on, wherein the front end of the train is a preset cockpit when the train is in a running state, and the STADIR parameter integral value of the train direction is 0;
the value range of the STADIR parameter integration is [ -M, M ], the larger the parameter integration value is, the higher the reliability of the current train direction is considered, and when the parameter integration value is negative, the current train direction is considered to be possibly judged to be wrong;
the mobile station accesses to the network base station, and judges whether to access to the same base station twice continuously according to whether the acquired Media Access Control (MAC) address of the current access base station is the same as the MAC address of the last access base station;
the mobile station continuously accesses to the same base station twice, further judges the timing advance TA difference value of the base station accessed to the network twice, and verifies whether the current train direction meets the preset corresponding relation or not when the TA difference value is larger than the preset TA threshold, and the STADIR parameter integral value is increased by 1 when the current train direction meets the preset corresponding relation, and the STADIR parameter integral value is decreased by 1 when the current train direction does not meet the preset corresponding relation;
the mobile station continuously accesses to the same base station twice, further judges the TA difference value of the timing advance of the base station accessed to the network twice, and when the TA difference value is not more than a preset TA threshold, the STADIR parameter value is unchanged;
it should be noted that, when the mobile station accesses to the same base station twice, in order to avoid multiple judgments at the same location, the parameter integral will reach the maximum threshold soon or become negative, and cause erroneous judgments, so the present invention requires that the TA is different by a preset TA threshold, so as to ensure that the mobile station is at different positions relative to the base station in each judgment.
If the mobile station is not the same base station, verifying whether the current train direction meets the preset corresponding relation, adding 1 to the STADIR parameter integral value when the current train direction meets the preset corresponding relation, and subtracting 1 to the STADIR parameter integral value when the current train direction does not meet the preset corresponding relation;
STADIR parameter integration calculation:
when the STADIR parameter integral value is <0, further comparing with the DRDIR parameter integral value:
when the STADIR parameter integral value is smaller than the DRDIR parameter integral value, the STADIR reliability is considered to be low, and the current train direction judgment is wrong and needs to be modified to the other direction;
when the STADIR parameter integral value is more than or equal to the DRDIR parameter integral value, the STADIR reliability is considered to be high, the traveling direction DRDIR is wrong, and the current train direction is unchanged;
when the STADIR parameter integral value is more than or equal to 0, the train direction is kept unchanged.
Example five
The present embodiment provides a method for determining a traveling direction by using a parameter integration method, and a flowchart is shown in fig. 5, including:
when the train runs along the fixed track, the running direction comprises running towards the direction of the terminal or running towards the direction of the starting point;
calculating a traveling direction DIDIDIR parameter integral value specifically comprises the following steps:
the integrated value range of the DIDIR parameter is [ -M, M ], the larger the integrated value of the parameter is, the higher the reliability of the current travelling direction is, and when the integrated value of the DIDIR parameter is negative, the current travelling direction is considered to be possibly misjudged;
When the power is initially applied, the traveling direction is the direction of the terminal, and the DIDIR parameter integral value is 0;
when a mobile station enters an anchoring station, judging the travelling direction of a train by an anchoring station method, wherein the DIDIDIR parameter integral value is the maximum value M;
the anchoring station is a starting point base station or an ending point base station;
when a mobile station enters a network starting point base station, the traveling direction is the direction running towards a terminal station;
when the mobile station enters the network terminal base station, the traveling direction is to run towards the direction of the starting station.
After the mobile station passes through the anchor station, the traveling direction judged by the anchor station method is considered to be accurate, and the DIDIDIR parameter integral value is set to be a maximum value M.
When a mobile station enters a non-anchor station:
judging whether to access the same base station twice continuously according to whether the acquired Media Access Control (MAC) address of the current access base station is the same as the MAC address of the last access base station;
the mobile station continuously accesses to the same base station twice, and further judges whether the TA difference value of the two timing advance is larger than a preset TA threshold; if the TA difference value is not greater than a preset TA threshold, the position of the mobile station which is accessed to the network twice relative to the base station is considered not to be moved, so that the DIDIR parameter integral value is unchanged; if the TA difference value is larger than a preset TA threshold, further verifying whether the current travelling direction meets a preset corresponding relation, adding 1 to the DIDIR parameter integral value when the current travelling direction meets the preset corresponding relation, and subtracting 1 from the DIDIR parameter integral value when the current travelling direction does not meet the preset corresponding relation;
When the mobile station continuously accesses to different base stations twice and the Media Access Control (MAC) addresses of the two base stations accessed twice accord with the network access sequence of the current traveling direction, the current traveling direction is unchanged, and the DIDIDIR parameter integral value is the maximum value M;
when the mobile station continuously accesses to different base stations for two times and the Media Access Control (MAC) addresses of the two base stations accessed to the network for two times do not accord with the network access sequence of the current traveling direction, the current traveling direction is wrong, the current traveling direction is modified, and the modified DIDIR parameter integral value is the maximum value M;
the method comprises the steps that an A base station and a B base station are arranged along an operation track from a starting point to a finishing point, a mobile station enters a network B base station, the network access sequence of the mobile station is judged according to the MAC address of the current network B base station and the MAC address of the last network A base station, when the network access sequence is determined to be A to B, the current traveling direction is operated towards the finishing point, the network access sequence from A to B accords with the current traveling direction, the current traveling direction is considered to be correct, and the DIDIR parameter integral value is the maximum value M;
when the network access sequence of the mobile station is judged to be B to A through the MAC address of the network access base station, the current traveling direction is the traveling direction towards the terminal station, namely the network access sequence does not accord with the current traveling direction, the current traveling direction is wrong, the mobile station is modified to the traveling direction towards the starting station, the modified traveling direction is correct, and the DIDIDIR parameter integral value is the maximum value M.
DIDIR parameter integration calculation:
when the DIDIR parameter integral value <0, further compare with the STADIR parameter integral value:
when the DRDIR parameter integral value is less than or equal to the STADIR parameter integral value, the reliability of the DRDIR is considered to be low, and the current travelling direction is judged to be wrong and needs to be modified to the other direction;
when the DRDIR parameter integral value is greater than the STADIR parameter integral value, the DRDIR reliability is considered to be high, the current travelling direction is unchanged, and the STADIR of the train direction is wrong;
when the DRDIR parameter integral value is more than or equal to 0, the advancing direction is kept unchanged.
It should be noted that, compared to DRDIR, the change of STADIR is small, and the change of the train direction is only caused when the train enters the garage, or the turning around of other unknown reasons; therefore, when the integrated values of the DRDIR and the STADIR are equal and are negative, the error rate of the DRDIR is higher, the DRDIR is preferentially modified, the traveling direction is modified to be the other direction (for example, the current traveling direction is the traveling direction towards the terminal station and the modification is the traveling direction towards the starting station), and when the modified DRDIR still meets the preset corresponding relation in a different mode, the STADIR is modified;
when the DRDIR and the STADIR of the mobile station are determined, the switching parameters can be determined uniquely, the DRDIR and the STADIR are reported to the base station when the mobile station enters the network, the base station sends the corresponding switching parameters RSSI and TA threshold to the mobile station according to the DRDIR and the STADIR reported by the mobile station, and the mobile station can perform measurement switching autonomously after receiving the RSSI and the TA threshold without participation of the base station in the whole process.
Example six
The present embodiment provides an adaptive cell switching device 600 of a rail transit train system, where the cell switching device 600 is a mobile station, and is disposed near a predetermined cockpit, as shown in fig. 6, and includes:
a determining module 610, configured to determine a traveling direction of a train and a train direction; the travel direction includes: running in the direction of the terminal station and running in the direction of the starting station; the train direction includes: the front end of the train is a preset cockpit during traveling, the rear end of the train is a preset cockpit during traveling, and the small cockpit is used for identifying the position of a mobile station arranged at the preset cockpit end;
the communication module 620 is configured to send the traveling direction and the train direction to a base station, and receive a handover parameter sent by the base station; the switching parameters comprise a received signal strength indication threshold and a timing advance threshold of a source cell;
after determining the DRDIR and the STADIR, the mobile station 600 can uniquely determine a handover threshold, when accessing the network, reports the DRDIR and the STADIR to the base station, and the base station issues the corresponding handover parameter RSSI threshold and TA threshold to the communication module 620 according to the reported DRDIR and STADIR;
further, the handover parameters further include neighbor cell information; the neighbor cell information includes: the number of the adjacent cells, the MAC address and the frequency point corresponding to each adjacent cell.
A measurement module 630, configured to detect a received signal strength and a timing advance of a source cell where the source cell is located;
the measurement module 630 is further configured to perform neighbor cell measurement when the RSSI and TA of the source cell reach a handover parameter threshold, that is, the handover condition is satisfied, and sequentially measure the RSSI of each neighbor cell;
specifically, switching to adjacent cell frequency to perform RSSI measurement, wherein the RSSI measurement result can be measured for several frames to obtain an average value or take an RSSI instantaneous value, so that the measurement result can be obtained in the fastest 1 frame;
in some alternative embodiments, when the RSSI and TA of the source cell meet the measurement switching condition, if uplink and downlink data to be transmitted are to be transmitted, the neighbor cell measurement is performed after the transmission and reception of the uplink and downlink data are preferentially completed.
A selecting module 640, configured to select a target cell for handover;
comparing and determining the optimal neighbor cell according to the measurement result of the RSSI of each neighbor cell obtained by the measurement module 630; and the optimal neighbor cell is the target cell for switching, if the switching is successful, the network is accessed to the target cell, and if the switching is failed, the network is retracted to the source cell.
Further, the determining module 610, as shown in fig. 7, includes:
a first determining unit 611 for determining a movement state of the mobile station;
The first determining unit 611 is specifically configured to determine whether the mobile station's movement state changes according to the mobile station's current movement state; the movement state includes: a preparation state, wherein the preparation state is close to the base station and far away from the base station;
the measurement module 630 periodically tests the current timing advance cur_ta, and the first determination unit 611 calculates a difference Δta between cur_ta and the previous timing advance pre_ta, and determines an effective mobile state of the mobile station according to the current mobile state of the mobile station, the difference Δta, and a mobile state change threshold;
the early timing advance Pre_TA is the timing advance of the mobile station when the mobile station just accesses to the network base station;
the movement state change threshold includes: a first moving state change threshold thrd1 and a second moving state change threshold thrd2;
1) The current state is the ready state, i.e. when the mobile station has just entered the network base station,
ΔTA＝Cur_TA–Pre_TA，
when Δta > thrd1 is detected, the MOSTATE transitions from the ready state to a remote base station;
when ΔTA < -thrd1 is detected, the MOSTATE is shifted from the ready state to close to the base station;
when detecting that-thrd 1 is less than or equal to delta TA is less than or equal to thrd1, the moving state is unchanged and the MOSTATE is still in a preparation state;
when the movement state changes, the early timing advance pre_ta=cur_ta; the movement state is unchanged and the early timing advance pre_ta is unchanged.
2) The current state is near the base station NERA
When Δta > thrd2 is detected, the MOSTATE becomes far from the base station;
when detecting that delta TA is less than or equal to thrd2, the MOSTATE movement state is unchanged;
when the movement state changes, the early timing advance pre_ta=cur_ta; the movement state is unchanged and the early timing advance pre_ta is unchanged.
3) The current state is far from the base station farray,
when ΔTA < -thrd2 is detected, the MOSTATE becomes close to the base station;
when detecting that the delta TA is more than or equal to-thrd 2, the MOSTATE movement state is unchanged;
when the movement state changes, the early timing advance pre_ta=cur_ta; the movement state is unchanged and the early timing advance pre_ta is unchanged.
On a linear line of a track traffic scene, three parameters of an effective moving state, a traveling direction and a train direction of the mobile station 600 dynamically meet a preset corresponding relation, and when the three parameters do not meet the preset corresponding relation, at least one parameter judging result is wrong; the active movement state includes: a base station is close to and far away from;
the preset corresponding relation is as follows:
the mobile station is far away from the base station, the traveling direction is the direction of the terminal station, and the front end of the train is a preset cockpit when the train travels;
the mobile station is far away from the base station, the traveling direction is the direction of traveling to the starting station, and the train direction is the predetermined cockpit at the rear end of the train when traveling;
The mobile station is close to the base station, the traveling direction is the direction of the terminal station, and the rear end of the train is a preset cockpit when the train travels;
the mobile station is close to the base station, the traveling direction is the direction of the starting station, and the front end of the train is a preset cockpit when the train travels.
The determining module 610 further includes:
a second determining unit 612 that determines a train direction and a traveling direction from the parameter integrated value, including:
a first calculating subunit 612a, configured to calculate a train direction parameter integral value:
initially powering on, wherein the front end of the train is a preset cockpit when the train runs, and the integral value of the train direction parameter is 0;
when the mobile station continuously accesses the network twice and the same base station is larger than a preset TA threshold, verifying whether the currently determined train direction meets a preset corresponding relation, adding 1 to the train direction parameter integral value when the currently determined train direction meets the preset corresponding relation, and subtracting 1 from the train direction parameter integral value when the currently determined train direction does not meet the preset corresponding relation.
A second calculation subunit 612b for calculating a travel direction parameter integrated value, including:
when the power is initially applied, the traveling direction is the traveling direction towards the terminal, and the parameter integral value of the traveling direction is 0;
when the mobile station 600 enters the network anchoring station, determining the traveling direction of the train by an anchoring station method, wherein the parameter integral value of the traveling direction is the maximum value M; the anchoring station is a starting point base station or an ending point base station;
When the mobile station 600 enters a non-anchor station:
when the mobile station continuously accesses to different base stations for two times, and the Media Access Control (MAC) addresses of the two base stations accessed to the network for two times accord with the network access sequence of the current traveling direction, the current traveling direction is unchanged, and the parameter integral value of the traveling direction is the maximum value M;
when the mobile station continuously accesses to different base stations for two times and the Media Access Control (MAC) addresses of the two base stations accessed to the network for two times do not accord with the network access sequence of the current traveling direction, the current traveling direction is wrong, the current traveling direction is modified, and the traveling direction parameter integral value is the maximum value M;
and when the TA difference value of the two timing advance is larger than a preset TA threshold, verifying whether the currently determined traveling direction meets a preset corresponding relation, adding 1 to the traveling direction parameter integral value when the currently determined traveling direction meets the preset corresponding relation, and subtracting 1 from the traveling direction parameter integral value when the currently determined traveling direction does not meet the preset corresponding relation.
A third determining subunit 612c, configured to determine the traveling direction and the train direction according to the calculation results of the first calculating subunit 612a and the second calculating subunit 612 b:
when only one integral value in the two parameters is negative, determining that the parameter direction of which the integral value is negative is wrong, and modifying;
When the two parameter integral values are both negative numbers and the travelling direction parameter integral value is not larger than the train direction parameter integral value, determining that the current travelling direction is wrong, and modifying the travelling direction;
when the two parameter integral values are both negative numbers and the travelling direction parameter integral value is larger than the train direction parameter integral value, the current train direction error is judged, and the train direction is modified.
It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. The processor and the storage medium may reside as discrete components in a user terminal.
For a software implementation, the techniques described in this disclosure may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. These software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
Claims (4)
1. An adaptive cell switching method of a rail transit train system, comprising:
determining the traveling direction of a train and the train direction; the travel direction includes: running in the direction of the terminal station and running in the direction of the starting station; the train direction includes: the front end of the train is a preset cockpit during traveling, and the rear end of the train is a preset cockpit during traveling;
the predetermined cockpit is used for identifying the position of the mobile station arranged at the predetermined cockpit end: the front end of the train is a preset cockpit during traveling, and the mobile station is positioned at the train head; the rear end of the train is a preset cockpit during traveling, and the mobile station is positioned at the tail of the train;
the mobile station sends the travelling direction and the train direction information to the base station and receives switching parameters sent by the base station; the switching parameters comprise a received signal strength threshold and a timing advance threshold of a source cell;
the mobile station periodically detects the received signal strength and timing advance of the source cell, and performs cell switching according to the switching parameters;
determining a train direction and a traveling direction by a parameter integration method, wherein the parameter integration method comprises the following steps:
calculating a train direction parameter integral value and calculating a traveling direction parameter integral value;
When only one integral value in the two parameters is negative, determining that the parameter direction of which the integral value is negative is wrong, and modifying;
when the two parameter integral values are both negative numbers and the travelling direction parameter integral value is not larger than the train direction parameter integral value, determining that the current travelling direction is wrong, and modifying the travelling direction;
when the two parameter integral values are both negative numbers and the travelling direction parameter integral value is larger than the train direction parameter integral value, judging that the current train direction is wrong, and modifying the train direction;
wherein, calculate train direction parameter integral value, include:
initially powering on, wherein the front end of the train is a preset cockpit when the train runs, and the integral value of the train direction parameter is 0;
when the mobile station continuously accesses the network for the same base station twice and the TA difference value of the timing advance of the two times is larger than a preset TA threshold, verifying whether the current train direction meets a preset corresponding relation, adding 1 to the train direction parameter integral value when the current train direction meets the preset corresponding relation, and subtracting 1 from the train direction parameter integral value when the current train direction does not meet the preset corresponding relation;
wherein the calculating of the traveling direction parameter integrated value includes:
when a mobile station enters an anchoring station, determining the traveling direction of a train by an anchoring station method, wherein the parameter integral value of the traveling direction is the maximum value M;
The anchoring station is a starting point base station or an ending point base station;
when a mobile station enters a network starting point base station, the traveling direction is the direction running towards a terminal station;
when a mobile station enters a network terminal base station, the traveling direction is the direction running to the starting station;
wherein the calculating of the traveling direction parameter integrated value further includes:
when a mobile station enters a non-anchor station:
when the mobile station continuously accesses to different base stations for two times, and the Media Access Control (MAC) addresses of the two base stations accessed to the network for two times accord with the network access sequence of the current traveling direction, the current traveling direction is unchanged, and the parameter integral value of the traveling direction is the maximum value M;
when the mobile station continuously accesses to different base stations for two times and the Media Access Control (MAC) addresses of the two base stations accessed to the network for two times do not accord with the network access sequence of the current traveling direction, the current traveling direction is wrong, the current traveling direction is modified, and the traveling direction parameter integral value is the maximum value M;
and when the mobile station continuously accesses the same base station twice and the TA difference value of the two timing advance is larger than a preset TA threshold, verifying whether the current traveling direction meets a preset corresponding relation, adding 1 to the parameter integral value of the traveling direction when the current traveling direction meets the preset corresponding relation, and subtracting 1 from the parameter integral value of the traveling direction when the current traveling direction does not meet the preset corresponding relation.
2. The adaptive cell switching method of claim 1, wherein,
The handover parameters further include neighbor information: the number of the neighbor cells, the Media Access Control (MAC) address and the frequency point corresponding to each neighbor cell;
when the received signal strength and timing advance of the source cell where the mobile station is located meet the switching conditions, neighbor cell measurement is carried out, the received signal strength of each neighbor cell is measured in sequence, and the target cell is selected for switching.
3. The adaptive cell switching method of claim 1, further comprising:
determining a movement state of the mobile station; the movement state includes: the preparation state, the base station approaching and the base station separating;
the mobile station periodically tests the current timing advance and calculates the difference between the current timing advance and the earlier timing advance;
and determining the moving state of the mobile station according to the current moving state of the mobile station, the difference value of the current timing advance and the earlier timing advance and the moving state change threshold.
4. The adaptive cell switching method of claim 1, wherein,
the method comprises the steps that three parameters of an effective moving state, a moving direction and a train direction of a mobile station meet a preset corresponding relation, and when the three parameters do not meet the preset corresponding relation, at least one parameter judging result is wrong; the effective movement state of the mobile station includes: near to the base station, far from the base station;
The preset corresponding relation is as follows:
the mobile station is far away from the base station, the traveling direction is the direction of the terminal station, and the front end of the train is a preset cockpit when the train travels;
the mobile station is far away from the base station, the traveling direction is the direction of traveling to the starting station, and the train direction is the predetermined cockpit at the rear end of the train when traveling;
the mobile station is close to the base station, the traveling direction is the direction of the terminal station, and the rear end of the train is a preset cockpit when the train travels;
the mobile station is close to the base station, the traveling direction is the direction of the starting station, and the front end of the train is a preset cockpit when the train travels.
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