A radio control system and method for a train automatic protection system

Abstract

A radio control system and method for a train automatic protection system, the radio control system comprising an ATP master control unit, a radio control unit and two radio groups, the first radio group comprising two radios which are primary and backup to each other, each of the radios can only establish a connection with one radio block center (RBC) at the same time, the second radio group comprising at least two radios which are redundant to each other, each of the radios can simultaneously establish a connection with at least two ground devices at the same time. The radio control method comprises a radio network entry stage, an IP query stage, a radio state preparation stage and a secure connection establishment stage. In the IP query stage and the secure connection establishment stage, when the two radios are in an available state, after the IP query or the secure connection establishment fails, the two available radios will alternately select, thereby improving the probability of successfully establishing communication. The radio state preparation stage is additionally provided, which maximizes the guarantee that the two radios are in an active state before the secure connection establishment process, thereby improving the availability of the system. After the secure connection is successfully established, a deactivation command is sent to the radio which has not established a connection with the ground device, thereby reducing the waste of network resources. In the secure connection establishment stage, different radio selection rules are designed for the RBC and the TSRS and the EOT, so that the TSRS and the EOT can simultaneously use one radio for connection, thereby improving the redundancy of the system.

Description

Technical Field

[0001] This invention relates to the field of rail transportation, and more particularly to a radio control system and method for an automatic protection system for trains. Background Technology

[0002] The existing CTCS-3 level train control system has two MT (vehicle radios) that communicate wirelessly with the RBC (Radio Block Center) via a GSM-R / GPRS wireless network. Both radios are circuit-switched radios, and each radio can only establish a secure connection with one ground device, which will result in a waste of network resources and a decrease in system redundancy.

[0003] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a radio control system and method for an automatic protection system for trains, which improves the probability of successfully establishing communication, enhances the availability and redundancy of the system, and reduces the waste of network resources.

[0005] To achieve the above objectives, the present invention provides a radio control system for a train automatic protection system, comprising:

[0006] The first radio group is used to communicate with the Radio Block Center (RBC) in the ground equipment via a wireless network. The first radio group contains two radios that are each other’s primary and backup. Each radio can only establish a connection with one RBC at a time.

[0007] The second radio group is used to communicate with ground equipment other than the Radio Block Center (RBC) via a wireless network. The second radio group contains at least two redundant radios, and each radio can establish connections with at least two ground equipment at the same time.

[0008] A radio control unit, which connects all radios in the first radio group and the second radio group, is used to control the operation of the radios;

[0009] The ATP master control unit is connected to the radio control unit and is used to control the entire radio control system.

[0010] The other ground equipment includes at least: Temporary Rate Limiting Server (TSRS) and End-of-Line Equipment (EOT).

[0011] Each radio station in the second radio group serves as the default connection station for prioritizing connection to another ground device.

[0012] The present invention also provides a radio control method based on the radio control system for the train automatic protection system, comprising:

[0013] Radio network access phase: After the train automatic protection system is powered on, the radio control unit sends a registration and network access command to all radios. After successful registration and network access, the radio's status changes to a network-accessed but inactive state.

[0014] IP Query Phase: After receiving the IP query request command sent by the ATP master control unit, the radio control unit selects a radio that meets the conditions to query the IP address of the ground device to be connected, based on the ground device to be connected.

[0015] Radio status preparation phase: After the ATP master control unit finds the IP address of the ground equipment to be connected, the ATP master control unit sends a radio preparation command to the radio control unit. After receiving the radio preparation command, the radio control unit confirms the radio that meets the conditions and sends a radio status confirmation message to the ATP master control unit.

[0016] Establishing a secure connection: After receiving the radio status confirmation message from the radio control unit, the ATP master control unit sends a secure connection establishment command to the radio control unit. Upon receiving the secure connection establishment command, the radio control unit selects a radio that meets the conditions and sends a secure connection establishment message to the ground equipment that needs to be connected.

[0017] During the IP query phase, the radio control unit selects a radio from the first radio group or the second radio group that meets the first availability condition to query the IP address of the ground device to be connected.

[0018] The first available condition refers to the radio's status being either "network-connected and activated" or "busy". The "network-connected and activated" status means that after receiving the activation command sent by the radio control unit, the radio's status changes from "network-connected but not activated" to "network-connected and activated". The "busy" status means that after the radio has successfully established a secure connection with at least one ground device, the radio's status changes from "network-connected and activated" to "busy".

[0019] If all stations in the first or second radio group meet the first availability condition, the station that is the current host or the station that is the default connection station will be selected first.

[0020] If all the radio stations in the first or second radio station group meet the first availability condition, when the IP address query fails, the radio stations that meet the condition are alternately selected for another query.

[0021] If none of the stations in the first or second radio group meet the first availability condition, the radio control unit sends an activation command to all stations.

[0022] During the radio status preparation phase, after the radio control unit receives the radio preparation command for connecting to the RBC from the radio preparation command sent by the ATP master control unit, it selects a radio in the first radio group that meets the second availability condition.

[0023] The second availability condition refers to the radio's status being either "networked but not activated" or "networked and activated."

[0024] If all stations in the first station group meet the second availability condition, the station that is selected as the current host will be given priority.

[0025] If the selected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it; if the unselected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it.

[0026] If the radio control unit confirms that any radio in the first radio group is in a network-connected and activated state, it sends a radio confirmation message to the ATP master control unit.

[0027] During the radio status preparation phase, after the radio control unit receives the radio preparation command connected to TSRS or the radio preparation command connected to EOT from the radio preparation command sent by the ATP master control unit, it selects a radio in the second radio group that meets the third availability condition.

[0028] The third availability condition refers to the following: the radio station's status is either "networked but not activated", "networked and activated", or "busy".

[0029] If a radio station in the second radio group that is the default connection station meets the third availability condition, then the radio station that is the default connection station is selected first. If the radio station that is the default connection station does not meet the third availability condition, then other radio stations that meet the third availability condition are selected.

[0030] If the selected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it; if the unselected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it.

[0031] If the radio control unit confirms that any radio in the second radio group is in a network-connected and activated state or a busy state, it sends a radio confirmation message to the ATP master control unit.

[0032] During the secure connection establishment phase, after receiving the secure connection establishment command with RBC from the secure connection establishment command sent by the ATP master control unit, the radio control unit selects a radio in the first radio group that meets the fourth availability condition.

[0033] The fourth availability condition refers to the radio station's status being that it is already connected to the network and activated.

[0034] If all stations in the first station group meet the fourth availability condition, then the station that is selected as the current host will be given priority.

[0035] If all stations in the first station group meet the fourth availability condition, when establishing a secure connection fails, stations that meet the condition will be selected alternately to re-establish a secure connection.

[0036] During the secure connection establishment phase, after receiving the secure connection establishment command or secure connection establishment command sent by the ATP master control unit to the TSRS or EOT, the radio control unit selects a radio in the second radio group that meets the first availability condition.

[0037] If a radio station in the second radio group that is the default connection station meets the first availability condition, then the radio station that is the default connection station is selected first. If the radio station that is the default connection station does not meet the first availability condition, then other radio stations that meet the first availability condition are selected.

[0038] If all stations in the second station group meet the first availability condition, when establishing a secure connection fails, stations that meet the condition are alternately selected to re-establish a secure connection.

[0039] During the secure connection establishment phase, once the secure connection is successfully established, if the unselected radio is in a network-connected and activated state, the radio control unit sends a deactivation command to it.

[0040] The present invention has the following beneficial effects:

[0041] 1. During the IP lookup phase and the secure connection establishment phase, if both radios are available, they will alternate between each other if the IP lookup or secure connection establishment fails, thereby increasing the probability of successfully establishing communication.

[0042] 2. A radio status preparation phase has been added to ensure that the first two radios are in PDP active state before establishing a secure connection, thus improving system availability. After a secure connection is successfully established, a PDP deactivation command will be sent to radios that have not yet established a connection with ground equipment, reducing the waste of network resources.

[0043] 3. During the secure connection establishment phase, different radio selection rules were designed for RBC, TSRS, and EOT, allowing TSRS and EOT to use the same radio for connection at the same time, thus improving system redundancy. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the radio control system provided by the present invention.

[0045] Figure 2 This is a diagram showing the changes in the radio station's status.

[0046] Figure 3 Flowchart for radio station selection during the IP lookup phase.

[0047] Figure 4 Flowchart for selecting a radio station to connect to the RBC during the radio station preparation phase.

[0048] Figure 5 Flowchart for selecting a radio station to connect to TSRS or EOT during the radio station preparation phase.

[0049] Figure 6 Flowchart for radio selection during the secure connection phase of connecting to the RBC.

[0050] Figure 7 Flowchart for selecting a radio station to connect to TSRS or EOT during the secure connection phase. Detailed Implementation

[0051] The following is based on Figures 1 to 7 The preferred embodiments of the present invention will be described in detail below.

[0052] The new train control system ATP (Automatic Train Protection) uses packet domain communication with ground equipment via GSM-R / GPRS wireless network, allowing a single radio to establish secure connections with multiple ground devices simultaneously. For example... Figure 1As shown, the new train control system ATP is equipped with a total of four radios, divided into RBC radio group MT1 and other radio groups MT2, MT1-1, MT1-2, MT2-1, and MT2-2. Among them, radios MT1-1 and MT1-2 in RBC radio group MT1 are used to establish secure connections with the Radio Block Center (RBC) in the ground equipment. Radios MT2-1 and MT2-2 in other radio group MT2 are used to establish secure connections with the TSRS (Temporary Speed ​​Limiting Server) and EOT (Earth Oxide Grid) in the ground equipment. Therefore, the control method of two circuit domain radios in the original CTCS-3 level train control system is not applicable to the four group domain radios of the new train control system. The limitation that a radio can only establish a secure connection with one ground equipment is also not applicable to the new train control system ATP's connection to TSRS and EOT, which would result in a waste of network resources and a decrease in system redundancy. To adapt to the new train control system, the radio control system provided by this invention includes: ATP main control unit 1, radio control unit 2, and four radios MT1-1, MT1-2, MT2-1, and MT2-2. During the RBC handover process, the onboard equipment may establish connections with two RBCs simultaneously. However, the new train control system specification requires that the radio MT used to connect to the RBC can only establish a connection with one RBC at a time and cannot connect to other RBCs / TSRS / EOTs. Therefore, four radio MTs are used, and two radio groups MT1 and MT2 are set up. The two radios MT1-1 and MT1-2 in the first radio group MT1 are mainly to deal with the situation of establishing connections with two RBCs at the same time. There are no restrictions on the use of MTs connected to TSRS and EOT (i.e., one radio MT can connect to TSRS and EOT at the same time). The two radios MT2-1 and MT2-2 in the second radio group MT2 are mainly set up from the perspective of redundancy.

[0053] To address the aforementioned problems, this invention provides a radio control method for an automatic train protection system. This method utilizes a radio control unit to monitor the status of four radios in real time and reports the radio status to the ATP main control unit. For example... Figure 2 As shown, the radio status includes: MT_NO_REGISTER (not yet registered), MT_REGISTERING (registering), MT_PDP_NOK (registered but not activated), MT_PDP_OK (registered and activated), and MT_BUSY (busy). When the radio receives the registration command from the radio control unit, the radio status changes from unregistered to unregistered.

[0054] The radio status changes from MT_NO_REGISTER to MT_REGISTERING (registering for network access). After successful network access (GSM-R / GPRS wireless network), the radio status changes to MT_PDP_NOK (network accessed but not activated). When the radio receives a PDP (Packet Data Protocol) activation command from the radio control unit, the radio status changes from MT_PDP_NOK (network accessed but not activated) to MT_PDP_OK (network accessed and activated). When the radio receives a PDP deactivation command from the radio control unit, the radio status changes from MT_PDP_OK (network accessed and activated) to MT_PDP_NOK (network accessed but not activated). After the radio successfully establishes a secure connection with the ground equipment, the radio status changes from MT_PDP_OK (network accessed and activated) to MT_BUSY (busy). Both the MT_PDP_OK (network accessed and activated) and MT_BUSY (busy) states are considered available.

[0055] The present invention provides a radio control method for a train automatic protection system, which divides the process of establishing a communication connection with ground equipment into an IP query stage, a radio status preparation stage, and a secure connection establishment stage.

[0056] Specifically, the radio control method includes the following steps:

[0057] Step S1: After the Train Automatic Protection System (ATP) is powered on, the radio control unit sends a registration and network access command to all radios.

[0058] Step S2: When the IP query request command sent by the ATP master control unit is received, the IP query stage is entered. The radio control unit selects the appropriate radio to query the IP address of the ground equipment to be connected according to the status of the radio.

[0059] The radio station sends an "IP query message" to the IP query server, which contains the ID of the device to be queried. For example, it might query the IP address of an RBC with the ID 8683521. Upon receiving this message, the IP query server checks its database for an RBC with the ID 8683521. If found, it sends the RBC's IP address (e.g., 172.16.20.106) to the radio station via a "Ground Equipment IP Query Receipt Message."

[0060] like Figure 3As shown, assuming the selectable stations are two stations MT2-1 and MT2-2 in station group MT2 (station group MT2 is used as an example here; the operation principle of the two stations in station group MT1 is similar to that of station group MT2), the first availability condition is set, which means that the station status is MT_PDP_OK or MT_BUSY.

[0061] If both radio stations MT2-1 and MT2-2 meet the first availability condition, MT2-1 shall be selected as the master station.

[0062] When both radios MT2-1 and MT2-2 meet the first availability condition, if the ATP master control unit fails to query the IP once and tries again, the two radios MT2-1 and MT2-2 will be selected alternately.

[0063] If the status of both radio stations MT2-1 and MT2-2 does not meet the first availability condition, then no radio station is selected, and a PDP activation command is sent to both radio stations MT2-1 and MT2-2.

[0064] Step S3: After the ATP master control unit has found the IP address of the ground equipment to be connected, the ATP master control unit sends a radio preparation command to the radio control unit and enters the radio status preparation stage.

[0065] The radio preparation command includes: a radio preparation command connected to the RBC, a radio preparation command connected to the TSRS, or a radio preparation command connected to the EOT.

[0066] After receiving the radio preparation command, the radio control unit selects a suitable radio based on the radio's status and determines whether to send a PDP activation command to the radio. When any radio meets the usage conditions, the radio control unit sends a radio status confirmation message to the ATP master control unit.

[0067] like Figure 4 As shown, when the radio control unit receives the radio preparation command for connecting to the RBC sent by the ATP master control unit, it selects the radio according to the following rules:

[0068] The selectable radio stations are two stations MT1-1 and MT1-2 in radio group MT1. Set the second availability condition, which means that the radio status is MT_PDP_NOK or MT_PDP_OK.

[0069] If both radio stations MT1-1 and MT1-2 meet the second availability condition, then MT1-1, which is selected as the master station, shall be given priority.

[0070] If no radio station meets the second availability condition, then no radio station is selected;

[0071] If the selected radio station is in the MT_PDP_NOK state, the radio control unit sends a PDP activation command to the selected radio station. In order to ensure that both radio stations MT1-1 and MT1-2 are in the MT_PDP_OK state during the secure connection phase, if the other radio station is also in the MT_PDP_NOK state, a PDP activation command is sent to it at the same time.

[0072] When the radio control unit determines that the status of any radio is MT_PDP_OK, it sends a radio confirmation message to the ATP master control unit.

[0073] like Figure 5 As shown, when the radio control unit receives a radio preparation command for connecting to the TSRS or a radio preparation command for connecting to the EOT from the ATP master control unit, it selects a radio according to the following rules:

[0074] The selectable radio stations are two stations MT2-1 and MT2-2 in radio group MT2. A third availability condition is set, which means that the radio status is MT_PDP_NOK, MT_PDP_OK or MT_BUSY.

[0075] The default radio station is selected first (MT2-1 is the default radio station when connecting to TSRS, and MT2-2 is the default radio station when connecting to EOT). If the default radio station does not meet the third availability condition and another radio station does meet the third availability condition, then the other radio station is selected.

[0076] If no station meets the third availability condition, no station is selected;

[0077] If the selected radio station is in the MT_PDP_NOK state, the radio control unit sends a PDP activation command to the selected radio station. In order to ensure that both radio stations are in the MT_PDP_OK state during the secure connection phase, if the other radio station is in the MT_PDP_NOK state, a PDP activation command is also sent to it at the same time.

[0078] When the radio control unit determines that the status of any radio is MT_PDP_OK or MT_BUSY, it sends a radio confirmation message to the ATP master control unit.

[0079] Step S4: After the ATP master control unit receives the radio status confirmation message sent by the radio control unit, it sends a secure connection establishment command to the radio control unit and enters the secure connection establishment phase.

[0080] The command to establish a secure connection includes: a command to establish a secure connection with RBC, a command to establish a secure connection with TSRS, or a command to establish a secure connection with EOT;

[0081] After receiving the secure connection establishment command, the radio control unit selects a suitable radio station based on the radio's status and sends a secure connection establishment message to the designated ground equipment.

[0082] like Figure 6 As shown, when the radio control unit receives the command to establish a secure connection with the RBC from the ATP master control unit, it selects the radio according to the following rules:

[0083] The selectable radio stations are two stations MT1-1 and MT1-2 in radio group MT1. A fourth availability condition is set, which means that the radio status is MT_PDP_OK.

[0084] Each radio station can only have one secure connection, that is, connect to one RBC;

[0085] If both radios meet the fourth availability condition, then MT1-1 will be selected as the host.

[0086] If a secure connection attempt fails and both radios meet the fourth availability condition, MT1-1 and MT1-2 should be selected alternately on the next attempt.

[0087] If no station meets the fourth availability condition, then no station is selected;

[0088] Once the secure connection is successfully established, if the other radio is in the MT_PDP_OK state, a PDP deactivation command is sent to it.

[0089] like Figure 7 As shown, when the radio control unit receives a command from the ATP master control unit to establish a secure connection with the TSRS or to establish a secure connection with the EOT, it selects the radio according to the following rules:

[0090] The selectable radio stations are two stations MT2-1 and MT2-2 in radio group MT2, using the first availability condition, which means that the radio status is MT_PDP_OK or MT_BUSY.

[0091] Radio group MT2 does not have the same usage restrictions as radio group MT1. When both radios MT2-1 and MT2-2 in radio group MT2 are normal, the default radio is selected first when connecting TSRS and EOT (the default radio when connecting TSRS is MT2-1, and the default radio when connecting EOT is MT2-2). When one radio fails, TSRS and EOT can share a radio.

[0092] If a secure connection attempt fails and both radios meet the first availability condition, MT2-1 and MT2-2 should be selected alternately on the next attempt.

[0093] If no radio station meets the first availability condition, then no radio station is selected;

[0094] Once a secure connection is successfully established, if the status of another radio is MT_PDP_OK, a PDP deactivation command is sent to it.

[0095] This invention is used to implement the station selection function during the establishment of a secure connection. When a station in the ATP system does not meet the availability conditions, the system can quickly select another station, thereby improving the availability and redundancy of the system.

[0096] It should be noted that, in the embodiments of the present invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0097] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0098] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described feature, integral, step, operation, element and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0099] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0100] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0101] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0102] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention. After reading the above content, various modifications and substitutions to the present invention will be obvious to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A radio control system for an automatic protection system of trains, characterized in that, Include: The first radio group is used to communicate with the Radio Block Center (RBC) in the ground equipment via a wireless network. The first radio group contains two radios that are each other’s primary and backup. Each radio can only establish a connection with one RBC at a time. The second radio group is used to communicate with other ground equipment besides the Radio Block Center (RBC) via a wireless network. The second radio group contains at least two redundant radios, and each radio can establish connections with at least two ground equipment at the same time. The other ground equipment includes at least a Temporary Rate Limiting Server (TSRS) and an End-of-Line Equipment (EOT). Each radio in the second radio group serves as the default connection radio for preferentially connecting to a certain other ground equipment. A radio control unit, which connects all radios in the first radio group and the second radio group, is used to control the operation of the radios; The ATP master control unit is connected to the radio control unit and is used to control the entire radio control system.

2. A radio control method based on the radio control system for an automatic train protection system as described in claim 1, characterized in that, Include: Radio network access phase: After the train automatic protection system is powered on, the radio control unit sends a registration and network access command to all radios. After successful registration and network access, the radio's status changes to a network-accessed but inactive state. IP Query Phase: After receiving the IP query request command sent by the ATP master control unit, the radio control unit selects a radio that meets the conditions to query the IP address of the ground device to be connected, based on the ground device to be connected. Radio status preparation phase: After the ATP master control unit finds the IP address of the ground equipment to be connected, the ATP master control unit sends a radio preparation command to the radio control unit. After receiving the radio preparation command, the radio control unit confirms the radio that meets the conditions and sends a radio status confirmation message to the ATP master control unit. Establishing a secure connection: After receiving the radio status confirmation message from the radio control unit, the ATP master control unit sends a secure connection establishment command to the radio control unit. Upon receiving the secure connection establishment command, the radio control unit selects a radio that meets the conditions and sends a secure connection establishment message to the ground equipment that needs to be connected.

3. The method as described in claim 2, characterized in that, During the IP query phase, the radio control unit selects a radio from the first radio group or the second radio group that meets the first availability condition to query the IP address of the ground device to be connected. The first available condition refers to the radio's status being either "network-connected and activated" or "busy". The "network-connected and activated" status means that after receiving the activation command sent by the radio control unit, the radio's status changes from "network-connected but not activated" to "network-connected and activated". The "busy" status means that after the radio has successfully established a secure connection with at least one ground device, the radio's status changes from "network-connected and activated" to "busy". If all stations in the first or second radio group meet the first availability condition, the station that is the current host or the station that is the default connection station will be selected first. If all the radio stations in the first or second radio station group meet the first availability condition, when the IP address query fails, the radio stations that meet the condition are alternately selected for another query. If none of the stations in the first or second radio group meet the first availability condition, the radio control unit sends an activation command to all stations.

4. The method as described in claim 3, characterized in that, During the radio status preparation phase, after the radio control unit receives the radio preparation command for connecting to the RBC from the radio preparation command sent by the ATP master control unit, it selects a radio in the first radio group that meets the second availability condition. The second availability condition refers to the radio's status being either "networked but not activated" or "networked and activated." If all stations in the first station group meet the second availability condition, the station that is selected as the current host will be given priority. If the selected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it; if the unselected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it. If the radio control unit confirms that any radio in the first radio group is in a network-connected and activated state, it sends a radio confirmation message to the ATP master control unit.

5. The method as described in claim 3, characterized in that, During the radio status preparation phase, after the radio control unit receives the radio preparation command connected to TSRS or the radio preparation command connected to EOT from the radio preparation command sent by the ATP master control unit, it selects a radio in the second radio group that meets the third availability condition. The third availability condition refers to the following: the radio station's status is either "networked but not activated", "networked and activated", or "busy". If a radio station in the second radio group that is the default connection station meets the third availability condition, then the radio station that is the default connection station is selected first. If the radio station that is the default connection station does not meet the third availability condition, then other radio stations that meet the third availability condition are selected. If the selected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it; if the unselected radio station is in a state of being registered but not activated, the radio control unit sends an activation command to it. If the radio control unit confirms that any radio in the second radio group is in a network-connected and activated state or a busy state, it sends a radio confirmation message to the ATP master control unit.

6. The method as described in claim 4 or 5, characterized in that, During the secure connection establishment phase, after receiving the secure connection establishment command with RBC from the secure connection establishment command sent by the ATP master control unit, the radio control unit selects a radio in the first radio group that meets the fourth availability condition. The fourth availability condition refers to the radio station's status being that it is already connected to the network and activated. If all stations in the first station group meet the fourth availability condition, then the station that is selected as the current host will be given priority. If all stations in the first station group meet the fourth availability condition, when establishing a secure connection fails, stations that meet the condition will be selected alternately to re-establish a secure connection.

7. The method as described in claim 4 or 5, characterized in that, During the secure connection establishment phase, after receiving the secure connection establishment command or secure connection establishment command sent by the ATP master control unit to the TSRS or EOT, the radio control unit selects a radio in the second radio group that meets the first availability condition. If a radio station in the second radio group that is the default connection station meets the first availability condition, then the radio station that is the default connection station is selected first. If the radio station that is the default connection station does not meet the first availability condition, then other radio stations that meet the first availability condition are selected. If all stations in the second station group meet the first availability condition, when establishing a secure connection fails, stations that meet the condition are alternately selected to re-establish a secure connection.

8. The method as described in claim 6 or 7, characterized in that, During the secure connection establishment phase, once the secure connection is successfully established, if the unselected radio is in a network-connected and activated state, the radio control unit sends a deactivation command to it.

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