A lightweight multi-level satellite communication network resource management and control system and method

Abstract

The application relates to a light-weight multi-stage satellite communication network resource management and control system and method, wherein the satellite provides an information forwarding function for wireless communication between the rest of the communication nodes, and the rest of the communication nodes are all in communication link with the satellite; a first-stage management and control unit realizes management and control on the satellite resources, parameter configuration on the communication link between the second-stage management and control unit and the satellite and between the terminal and the satellite, resource allocation and release on the second-stage management and control unit and the terminal, and monitoring on the network state of the second-stage management and control unit and judgment on whether the resource configuration instruction takes effect; the second-stage management and control unit realizes secondary allocation of the terminal resources, uniformly reports the resource allocation information of the terminal to the first-stage management and control unit, monitors the network state of the terminal, and judges whether the resource configuration instruction takes effect. The application can be applied to system integration and information interaction among multiple communication networks, has the characteristics of light weight, good universality and compatibility, and improves the information interaction efficiency among the communication nodes.

Description

Technical Field

[0001] This invention belongs to the field of satellite communication technology and relates to a lightweight multi-level satellite communication network resource management system and method. Background Technology

[0002] With the continuous development of satellite communication technology, communication scenarios are becoming increasingly complex and diverse. Communication nodes exhibit multi-level organizational structures and form internal networks based on control relationships. Currently, satellite communication often adopts a network control model based on a single central station. The protocol conversion overhead between different networks is too high, failing to meet the needs for rapid system integration and efficient information exchange among multiple internal communication networks. Furthermore, considering the limitations of satellite payload capacity, network control methods must be lightweight. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a lightweight multi-level satellite communication network resource management system and method, which realizes hierarchical management of communication network resources, while having the characteristics of being lightweight, having good versatility and compatibility, and improving the information interaction efficiency between communication nodes at all levels.

[0004] The solution of the present invention is: a lightweight multi-level satellite communication network resource management and control system, wherein the communication nodes of the system include satellites, primary management and control units, secondary management and control units, and terminals;

[0005] As the central node for communication service transmission in the network, the satellite provides information forwarding function for wireless communication between other communication nodes at all levels, and all other communication nodes at all levels establish communication links with the satellite.

[0006] The primary control unit manages and controls the network resources of the entire system, including the management and control of satellite resources, configuring the parameters of the communication links between the secondary control unit and the satellite, and between the terminal and the satellite, and issuing resource configuration instructions to the secondary control unit and the terminal, which are used to allocate and release resources for the secondary control unit and the terminal, respectively; the primary control unit receives and parses the telemetry information returned by the secondary control unit, monitors the network status of the secondary control unit, and determines whether the resource configuration instructions for the secondary control unit have been configured successfully;

[0007] The secondary control unit performs secondary allocation of terminal resources, replies the terminal resource allocation information to the primary control unit; receives and parses the telemetry information returned by the terminal, monitors the network status of the terminal, and determines whether the resource configuration command for the terminal has been successfully configured; and periodically transmits its own telemetry information back to the primary control unit.

[0008] As the controlled object, the terminal periodically transmits its own telemetry information back to the secondary control unit.

[0009] Furthermore, the primary control unit directly controls M secondary control units to form a primary control network, and indirectly controls N terminals through the M secondary control units.

[0010] Each secondary control unit directly controls Q terminals, forming a secondary control network; among them...

[0011] Furthermore, each secondary control unit can access the satellite communication network via either time division multiple access (TDMA) or frequency division multiple access (FDMA) to communicate with the satellite, the primary control unit, and the terminal; each terminal can access the satellite communication network via either TDMA or FDMA to communicate with the satellite and the secondary control unit.

[0012] Furthermore, the resource allocation and release for the secondary control unit and the terminal specifically includes:

[0013] The types of resources managed by the secondary control unit include time slot resources and frequency resources; the types of resources managed by the terminal include time slot resources and frequency resources.

[0014] Furthermore, a lightweight multi-level satellite communication network resource management method is provided, including the following process:

[0015] According to the task plan, the primary control unit clarifies the hierarchical control relationship between the primary control unit, the secondary control unit, and the terminal. It is used to issue resource configuration instructions for the secondary control unit and the terminal to the secondary control unit. It also completes the initialization of the resource pools of the secondary control unit and the terminal based on the quantity information, location information, and communication rate requirements of the secondary control unit. The initialization of the secondary control unit resource pool includes all time slot resource information and all frequency resource information that can be allocated to the secondary control unit. The initialization of the terminal resource pool includes all time slot resource information and all frequency resource information that can be allocated to the terminal.

[0016] Each secondary control unit sends resource request information to the primary control unit, requesting communication link resources between itself and the satellite, including its own equipment identification code and communication rate requirements. The primary control unit allocates time slot resources and frequency resources according to the resource request information sent by each secondary control unit, sends the corresponding equipment identification code and corresponding time slot resources and frequency resources to each secondary control unit, and configures the parameters of the communication link between each secondary control unit and the satellite, including radio frequency channel configuration, data processor, and receiver parameter configuration, thereby realizing two-way communication between the satellite and the secondary control unit.

[0017] After a secondary control unit joins the network, it submits a terminal resource allocation request to the primary control unit based on the needs of the terminals it controls, requesting communication link resources between the terminals and the satellite. The primary control unit is responsible for the unified allocation and management of terminal resources, while the secondary control unit is responsible for the secondary allocation and direct management of terminal resources.

[0018] The secondary control unit periodically sends back telemetry information to the primary control unit. The primary control unit parses and processes the back telemetry information from the secondary control unit to achieve real-time monitoring of the network status of the secondary control unit and to determine whether the resource configuration instructions for the secondary control unit are effective.

[0019] The terminal periodically sends back telemetry information to the secondary control unit. The secondary control unit parses and processes the back telemetry information of the terminal to realize real-time monitoring of the terminal's network status and determine whether the resource configuration instructions for the terminal are effective.

[0020] Furthermore, the primary control unit is responsible for the unified allocation and management of terminal resources, while the secondary control unit is responsible for the secondary allocation and direct management of terminal resources, specifically as follows:

[0021] The secondary control unit sends terminal channel request information to the primary control unit;

[0022] The primary control unit allocates resources based on the terminal channel application information, generates channel grant information and sends it to the secondary control unit, and configures the parameters of the communication link between each terminal and the satellite.

[0023] After receiving the channel grant information, the secondary control unit clarifies the matching relationship between the channel and the terminal, configures the terminal channel parameters, and replies to the primary control unit with the terminal channel matching information, thus completing the secondary allocation of communication resources.

[0024] Furthermore, the terminal channel application information is used to apply for communication link resources between the terminal and the satellite, including the number of terminals currently managed by the secondary control unit, the device identification code of each terminal, and the total number of time slot resources and frequency resources applied for;

[0025] The channel grant information includes the total number of time slots and frequencies requested, as well as the allocated time slots and frequency resource groups.

[0026] Furthermore, the parameter configuration of the communication link between each terminal and the satellite includes the configuration of the radio frequency channel, the data processor, and the receiver parameters, thereby realizing bidirectional communication between the satellite and the terminal.

[0027] Furthermore, the telemetry information sent from the secondary control unit to the primary control unit includes: the status of the secondary control unit's equipment, the resource usage status of the communication link between the satellite and the secondary control unit (including the link communication time slot and frequency), and the status of the communication link between the satellite and the secondary control unit (including the communication rate and signal-to-noise ratio).

[0028] The determination of whether the resource configuration instructions for the secondary control unit are effective is specifically as follows:

[0029] The parameters "Resource Usage Status of Satellite-Secondary Control Unit Communication Link" and "Communication Link Status of Satellite-Secondary Control Unit" in the returned telemetry information are analyzed to determine whether the parameters are consistent with the resource configuration instructions for the secondary control unit. If they are consistent, it means that the resource configuration instructions for the secondary control unit have taken effect and the configuration is successful. If they are inconsistent, it means that the resource configuration instructions for the secondary control unit have not taken effect and the resource configuration process for the secondary control unit is restarted.

[0030] Furthermore, the telemetry information sent from the terminal to the secondary control unit includes: the terminal equipment status, the resource usage status of the satellite-terminal communication link (including link communication time slots and frequencies), and the satellite-terminal communication link status (including communication rate and signal-to-noise ratio).

[0031] The determination of whether the resource configuration command for the terminal is effective specifically involves:

[0032] The parameters "Resource Usage Status of Satellite-Terminal Communication Link" and "Satellite-Terminal Communication Link Status" in the returned telemetry information are analyzed to determine whether the parameters are consistent with the resource configuration command for the terminal. If they are consistent, it means that the resource configuration command for the terminal has taken effect and the configuration is successful; if they are inconsistent, it means that the resource configuration command for the terminal has not taken effect and the resource configuration process for the terminal is restarted.

[0033] The advantages of this invention compared to the prior art are:

[0034] (1) This invention manages communication network resources hierarchically based on the hierarchical architecture relationship between communication nodes, which fully meets the needs of rapid system integration and efficient information interaction between multiple internal communication networks. It is easy to port and has good versatility and compatibility.

[0035] (2) The present invention simplifies the handshake process in the instruction configuration process, effectively improves the information exchange efficiency between communication nodes at all levels, and is more suitable for building a lightweight network resource management and control system. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a lightweight multi-level satellite communication network resource management system according to the present invention;

[0037] Figure 2 This is a schematic diagram of the network resource management process of the present invention. Detailed Implementation

[0038] The present invention will be further described below with reference to the embodiments.

[0039] Example 1

[0040] like Figure 1 As shown, the lightweight multi-level satellite communication network resource management and control system of the present invention adopts a hierarchical management and control architecture. The communication network resources are managed and controlled hierarchically according to the hierarchical relationship between communication nodes. The communication nodes of the system include satellites, primary management and control units, secondary management and control units, and terminals.

[0041] As the central node for communication service transmission in the network, the satellite achieves full coverage of the communication scenario and provides information forwarding function for long-distance wireless communication between other communication nodes at all levels. All other communication nodes at all levels need to establish a communication link with the satellite.

[0042] The primary control unit manages and controls the network resources of the entire system, including satellite resource management, configuring communication link parameters between the secondary control unit and the satellite, and between the terminal and the satellite, and issuing resource configuration commands to the secondary control units and terminals for resource allocation and release, respectively. The managed resource types mainly include frequency resources and time slot resources. Simultaneously, the primary control unit monitors the network status of the secondary control units by parsing and processing the telemetry information returned by the secondary control units, determining whether the resource configuration commands are effective. The primary control unit directly manages the secondary control units, forming the primary control network, and indirectly manages the terminals through the secondary control units.

[0043] The secondary control unit manages terminal resources, including secondary allocation of these resources, and reports the resource allocation information to the primary control unit. Simultaneously, the secondary control unit analyzes and processes the telemetry information returned by the terminals, monitors the network status of the terminals, determines whether resource configuration commands are effective, and periodically transmits its own telemetry information back to the primary control unit. The secondary control unit directly manages the terminals, forming a secondary control network.

[0044] As the controlled object, the terminal periodically transmits its own telemetry information back to the secondary control unit.

[0045] In this invention, each secondary control unit can access the satellite communication network using time division multiple access or frequency division multiple access to communicate with the satellite, the primary control unit, and the terminal; each terminal can access the satellite communication network using time division multiple access or frequency division multiple access to communicate with the satellite and the secondary control unit.

[0046] like Figure 2 The diagram illustrates a flowchart of the lightweight multi-level satellite communication network resource management method described in this invention. For the sake of generality, the following example describes a handover process using a scenario with multiple secondary management units, each managing multiple terminals, each secondary management unit employing time-division multiple access (TDMA), and each terminal employing frequency-division multiple access (FDMA). In this case, the resource types managed by the secondary management units include time slot resources, and the resource types managed by the terminals include frequency resources.

[0047] (1) Resource pool initialization

[0048] According to the task plan, the primary control unit defines the hierarchical control relationships between itself, M secondary control units, and N terminals (where 1 ≤ M ≤ N). This is used to issue resource configuration instructions from the secondary control units and the terminals to the secondary control units. Furthermore, based on the number, location, and communication rate requirements of the secondary control units, it initializes the resource pools for both the secondary control units and the terminals. Specifically, the initialization of the secondary control unit resource pool includes all available resource information, such as all time slot resources and all frequency resources; the initialization of the terminal resource pool includes all available resource information, such as all time slot resources and all frequency resources, that can be allocated to the terminals.

[0049] (2) Resource allocation of secondary control units

[0050] Each secondary control unit sends resource request information to the primary control unit, requesting communication link resources between itself and the satellite, including its own equipment identification code, communication rate requirements, etc. The primary control unit allocates time slot resources and frequency resources based on the resource request information sent by the M secondary control units, and sends resource allocation information to each secondary control unit, including its equipment identification code and corresponding time slot resources and frequency resources. The primary control unit also configures the parameters of the communication link between each secondary control unit and the satellite, including the local oscillator frequency, filter parameters and other radio frequency channel configurations, as well as the relevant parameter configurations of the data processor, receiver, etc., thereby realizing two-way communication between the satellite and the secondary control units.

[0051] (3) Terminal resource allocation

[0052] After joining the network, the secondary control unit sends terminal channel request information to the primary control unit based on the needs of the Q terminals it manages (where 1 ≤ Q ≤ N). This request requests communication link resources between the terminals and the satellite, including the number of managed terminals Q, the device identification code of each terminal, and the total number of time slots and frequency resources requested. The primary control unit allocates resources based on the request information, generates channel grant information, and sends it to the secondary control unit. This information includes the total number of requested time slots and frequencies, the allocated time slot and frequency resource groups, and the parameters of the communication link between each terminal and the satellite. This includes the configuration of radio frequency channels such as local oscillator frequency and filter parameters, as well as related parameters such as data processors and receivers, thereby enabling bidirectional communication between the satellite and the terminals. Upon receiving the channel grant information, the secondary control unit completes a secondary allocation of communication resources, namely, clarifying the matching relationship between the channel and the terminal identification code, configuring the terminal channel parameters, and replying to the primary control unit with terminal channel matching information.

[0053] (4) Network status monitoring

[0054] The secondary control unit periodically sends back telemetry information to the primary control unit. The primary control unit parses and processes the back telemetry information from the secondary control unit to achieve real-time monitoring of the network status of the secondary control unit and to determine whether the resource configuration instructions for the secondary control unit are effective.

[0055] Specifically, the telemetry information sent from the secondary control unit to the primary control unit includes: the equipment status of the secondary control unit, the resource usage status of the communication link between the satellite and the secondary control unit (including link communication time slots, frequencies, etc.), and the communication link status between the satellite and the secondary control unit (including communication rate, signal-to-noise ratio, etc.). The primary control unit parses the parameters such as "resource usage status of the communication link between the satellite and the secondary control unit" and "communication link status between the satellite and the secondary control unit" in the telemetry information to determine whether these parameters are consistent with the aforementioned resource configuration instructions to the secondary control unit. If they are consistent, it means that the resource configuration instructions to the secondary control unit have taken effect and the configuration has been successful; if they are inconsistent, it means that the resource configuration instructions to the secondary control unit have not taken effect successfully, and the resource configuration process for the secondary control unit is re-initiated.

[0056] The terminal periodically sends back telemetry information to the secondary control unit. The secondary control unit parses and processes the back telemetry information of the terminal to realize real-time monitoring of the terminal's network status and determine whether the resource configuration instructions for the terminal are effective.

[0057] Specifically, the terminal sends return telemetry information to the secondary control unit, including: terminal device status, resource usage status of the satellite-terminal communication link (including link communication time slots, frequencies, etc.), and satellite-terminal communication link status (including communication rate, signal-to-noise ratio, etc.). The secondary control unit parses the parameters such as "resource usage status of the satellite-terminal communication link" and "satellite-terminal communication link status" in the return telemetry information and determines whether these parameters are consistent with the aforementioned resource configuration instructions for the terminal. If they are consistent, it means that the resource configuration instructions for the terminal have taken effect and the configuration is successful; if they are inconsistent, it means that the resource configuration instructions for the terminal have not taken effect successfully, and the resource configuration process for the terminal is re-initiated.

[0058] The above description is only the best specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope recorded in the present invention (for example, adopting a multi-level network management and control design method to deploy the first-level management and control unit on a ground station or satellite; for example, the second-level management and control unit adopts a frequency division multiple access method and the terminal adopts a time division multiple access method) should be covered within the protection scope of the present invention.

[0059] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A lightweight multi-level satellite communication network resource management and control system, characterized in that, The system's communication nodes include satellites, primary control units, secondary control units, and terminals; As the central node for communication service transmission in the network, the satellite provides information forwarding function for wireless communication between other communication nodes at all levels, and all other communication nodes at all levels establish communication links with the satellite. The primary control unit manages and controls the network resources of the entire system, including the management and control of satellite resources, configuring the parameters of the communication links between the secondary control unit and the satellite, and between the terminal and the satellite, and issuing resource configuration instructions to the secondary control unit and the terminal, which are used to allocate and release resources for the secondary control unit and the terminal, respectively; the primary control unit receives and parses the telemetry information returned by the secondary control unit, monitors the network status of the secondary control unit, and determines whether the resource configuration instructions for the secondary control unit have been configured successfully; The secondary control unit performs secondary allocation of terminal resources, replies the terminal resource allocation information to the primary control unit; receives and parses the telemetry information returned by the terminal, monitors the network status of the terminal, and determines whether the resource configuration command for the terminal has been successfully configured; and periodically transmits its own telemetry information back to the primary control unit. As the controlled object, the terminal periodically transmits its own telemetry information back to the secondary control unit; The primary control unit directly controls M secondary control units, forming a primary control network, and indirectly controls N terminals through the M secondary control units. Each secondary control unit directly controls Q terminals, forming a secondary control network; wherein, 1≤M≤N, 1≤Q, ; After the secondary control unit joins the network, it sends terminal channel application information to the primary control unit according to the needs of the Q terminals it controls. The application requests communication link resources between the terminals and the satellite, including the number of terminals Q, the device identification code of each terminal, and the total number of time slots and frequency resources requested. The primary control unit allocates resources according to the application information, generates channel grant information and sends it to the secondary control unit, including the total number of time slots and frequencies requested and the allocated time slot and frequency resource groups. The primary control unit also configures the parameters of the communication link between each terminal and the satellite, including the local oscillator frequency, filter parameters, radio frequency channel configuration, and data processor and receiver related parameter configuration, thereby realizing two-way communication between the satellite and the terminals. After receiving the channel grant information, the secondary control unit completes the secondary allocation of communication resources, namely, clarifying the matching relationship between the channel and the terminal identification code, configuring the terminal channel parameters, and replying the terminal channel matching information to the primary control unit.

2. The lightweight multi-level satellite communication network resource management and control system according to claim 1, wherein, Each secondary control unit can access the satellite communication network via either time division multiple access (TDMA) or frequency division multiple access (FDMA) to communicate with the satellite, primary control unit, and terminals. Each terminal can access the satellite communication network via either TDMA or FDMA to communicate with the satellite and secondary control unit.

3. The lightweight multi-level satellite communication network resource management and control system of claim 1, wherein, The resource allocation and release for the secondary control unit and terminals are specifically as follows: The types of resources managed by the secondary control unit include time slot resources and frequency resources; the types of resources managed by the terminal include time slot resources and frequency resources.

4. A lightweight multi-level satellite communication network resource management and control method, characterized in that The system applied to any one of claims 1 to 3 includes the following process: According to the task plan, the primary control unit clarifies the hierarchical control relationship between the primary control unit, the secondary control unit, and the terminal. It is used to issue resource configuration instructions for the secondary control unit and the terminal to the secondary control unit. It also completes the initialization of the resource pools of the secondary control unit and the terminal based on the quantity information, location information, and communication rate requirements of the secondary control unit. The initialization of the secondary control unit resource pool includes all time slot resource information and all frequency resource information that can be allocated to the secondary control unit. The initialization of the terminal resource pool includes all time slot resource information and all frequency resource information that can be allocated to the terminal. Each secondary control unit sends resource request information to the primary control unit, requesting communication link resources between itself and the satellite, including its own equipment identification code and communication rate requirements. The primary control unit allocates time slot resources and frequency resources according to the resource request information sent by each secondary control unit, sends the corresponding equipment identification code and corresponding time slot resources and frequency resources to each secondary control unit, and configures the parameters of the communication link between each secondary control unit and the satellite, including radio frequency channel configuration, data processor, and receiver parameter configuration, thereby realizing two-way communication between the satellite and the secondary control unit. After a secondary control unit joins the network, it submits a terminal resource allocation request to the primary control unit based on the needs of the terminals it controls, requesting communication link resources between the terminals and the satellite. The primary control unit is responsible for the unified allocation and management of terminal resources, while the secondary control unit is responsible for the secondary allocation and direct management of terminal resources. The secondary control unit periodically sends back telemetry information to the primary control unit. The primary control unit parses and processes the back telemetry information from the secondary control unit to achieve real-time monitoring of the network status of the secondary control unit and to determine whether the resource configuration instructions for the secondary control unit are effective. The terminal periodically sends back telemetry information to the secondary control unit. The secondary control unit parses and processes the back telemetry information of the terminal to realize real-time monitoring of the terminal's network status and determine whether the resource configuration instructions for the terminal are effective.

5. The method of claim 4, wherein, The primary control unit is responsible for the unified allocation and management of terminal resources, while the secondary control unit is responsible for the secondary allocation and direct management of terminal resources, specifically as follows: The secondary control unit sends terminal channel request information to the primary control unit; The primary control unit allocates resources based on the terminal channel application information, generates channel grant information and sends it to the secondary control unit, and configures the parameters of the communication link between each terminal and the satellite. After receiving the channel grant information, the secondary control unit clarifies the matching relationship between the channel and the terminal, configures the terminal channel parameters, and replies to the primary control unit with the terminal channel matching information, thus completing the secondary allocation of communication resources.

6. The method of claim 5, wherein, The terminal channel application information is used to apply for communication link resources between the terminal and the satellite, including the number of terminals currently managed by the secondary control unit, the device identification code of each terminal, and the total number of time slot resources and frequency resources applied for. The channel grant information includes the total number of time slots and frequencies requested, as well as the allocated time slots and frequency resource groups.

7. A lightweight multi-level satellite communication network resource management method according to claim 5, characterized in that, The parameter configuration of the communication link between each terminal and the satellite includes the configuration of the radio frequency channel, the data processor, and the receiver parameters, thereby realizing bidirectional communication between the satellite and the terminal.

8. A lightweight multi-level satellite communication network resource management method according to claim 4, characterized in that, The telemetry information sent from the secondary control unit to the primary control unit includes: the status of the secondary control unit equipment, the resource usage status of the communication link between the satellite and the secondary control unit (including the link communication time slot and frequency), and the status of the communication link between the satellite and the secondary control unit (including the communication rate and signal-to-noise ratio). The determination of whether the resource configuration instructions for the secondary control unit are effective is specifically as follows: The parameters "Resource Usage Status of Satellite-Secondary Control Unit Communication Link" and "Communication Link Status of Satellite-Secondary Control Unit" in the returned telemetry information are analyzed to determine whether the parameters are consistent with the resource configuration command for the secondary control unit. If they are consistent, it means that the resource configuration command for the secondary control unit has taken effect and the configuration is successful. If they are inconsistent, it means that the resource configuration command for the secondary control unit has not taken effect and the resource configuration process for the secondary control unit is restarted.

9. A lightweight multi-level satellite communication network resource management method according to claim 4, characterized in that, The telemetry information sent from the terminal to the secondary control unit includes: terminal equipment status, resource usage status of the satellite-terminal communication link (including link communication time slots and frequencies), and satellite-terminal communication link status (including communication rate and signal-to-noise ratio). The determination of whether the resource configuration command for the terminal is effective specifically involves: The parameters "Resource Usage Status of Satellite-Terminal Communication Link" and "Satellite-Terminal Communication Link Status" in the returned telemetry information are analyzed to determine whether the parameters are consistent with the resource configuration command for the terminal. If they are consistent, it means that the resource configuration command for the terminal has taken effect and the configuration is successful; if they are inconsistent, it means that the resource configuration command for the terminal has not taken effect and the resource configuration process for the terminal is restarted.

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