CN106230497B - Spatial information network resource double-layer scheduling method and system - Google Patents
Spatial information network resource double-layer scheduling method and system Download PDFInfo
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Abstract
The invention relates to a double-layer scheduling method and a double-layer scheduling system for spatial information network resources, wherein the double-layer scheduling method for the spatial information network resources is applied to a space-based scheduling center and comprises the following steps: the space-based sensing node counts task requirements of the sensing node every other fixed time period; the space-based sensing center collects information such as task bandwidth requirements, time delay requirements and the like of each space-based sensing node according to a fixed time period; the space-based sensing center generates a matrix scheduling table according to a priority strategy agreed in advance, in combination with a time delay requirement and a bandwidth requirement, the matrix scheduling table comprises a data uplink scheduling table and a data downlink scheduling table, and the data uplink scheduling table is sent to the ground sensing center. The invention solves the problems of limited global coverage capability and weak network expansion and cooperative application capability of the existing spatial information network, and greatly improves the reliability and stability of real-time end-to-end transmission capacity optimization under large space-time span.
Description
Technical Field
The invention relates to a double-layer scheduling method and a double-layer scheduling system for spatial information network resources, and belongs to the technical field of spatial information networks.
Background
The spatial information network serves as an important national infrastructure and can serve many fields such as ocean navigation, emergency rescue, navigation and positioning, air transportation, aerospace measurement and control and the like. However, due to the dynamic change of the spatial information network system and the frequent connection/interruption of the communication link, the available network bandwidth and the service quality of the network at different times are changed, and the requirements of various aircraft information transmission bandwidths are different, for example, the spatial information battle is served preferentially in wartime, so that the instantaneity and the effectiveness of the battle can be improved; the emergency service system can serve emergency events and the like preferentially at ordinary times, and the response speed to the emergency events is accelerated; in addition, fairness and maximum efficiency of network resources are guaranteed as much as possible, and different requirements of different users are met as best effort. The spatial information network is a three-dimensional mesh network which takes a satellite as a core and consists of nodes such as a ground control center, information platforms such as an aircraft and a spacecraft, a user terminal and the like. Many low earth orbit reconnaissance satellites need to access a spatial information network to complete data transmission through the relay of the medium and high earth orbit satellites. While the number and resources of medium and high orbit satellites used for relay transmission are limited.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a spatial information network resource double-layer scheduling method and system for an information network link, which aim at the characteristics of a spatial information network, and realize high bandwidth utilization rate and network throughput by scheduling network resources of the spatial information network in combination with a working mode and task requirements.
The invention aims to establish a spatial information network resource scheduling model which mainly comprises a space-based scheduling center and a foundation scheduling center, wherein the space-based scheduling center and the foundation scheduling center can respectively realize real-time scheduling of network resources and can also run in a coordinated manner according to different working modes. The model can effectively improve the resource utilization rate of the spatial information network, improve the network throughput and exert the maximum efficiency of the spatial information network resources.
The technical scheme for solving the technical problems is as follows: according to the characteristics of a spatial information network, a scheduling system for space-based foundation cooperative operation is provided, and comprises three working modes: the system comprises a space-based scheduling independent operation mode, a foundation scheduling independent operation mode and a space-based foundation cooperative operation mode. The space-based scheduling independent operation mode is an autonomous communication mode depending on a space-based sensing center, is applied to the space-based scheduling center, and comprises the following steps:
step 1: the space-based sensing node counts task requirements of the sensing node every other fixed time period;
step 2: the space-based sensing center collects information such as task bandwidth requirements, time delay requirements and the like of each space-based sensing node according to a fixed time period;
and step 3: the space-based sensing center generates a matrix scheduling table according to a priority strategy agreed in advance, in combination with a time delay requirement and a bandwidth requirement, the matrix scheduling table comprises a data uplink scheduling table and a data downlink scheduling table, and the data uplink scheduling table is sent to the ground sensing center;
and 4, step 4: and the space-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and downlink the data through the space-based sensing center. And the ground-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and uploads the data through the ground-based sensing center.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the space-based sensing node also sends the ID and the position information of the space-based sensing node to a space-based sensing center.
Further, after the space-based sensing center collects the task requirements, the space-based sensing center classifies the task according to the degree of urgency of the task, divides the priority, and provides data transmission service for the sensing nodes according to the sequence of the priority.
Further, the space-based sensing center should be a space-based backbone network node and should be able to provide data relay and distribution services, such as a relay satellite; the space-based sensing node comprises a spacecraft and a near-ground aircraft.
The technical scheme for solving the technical problems is as follows: the ground-based scheduling independent operation mode can communicate only through the control and management of the corresponding ground sensing node depending on the space-based sensing node, is applied to a ground-based scheduling center, and comprises the following steps:
step 1: the method comprises the steps that a foundation sensing node counts task requirements of the sensing node every other fixed time period;
step 2: the method comprises the following steps that a foundation sensing center collects information such as task bandwidth requirements and time delay requirements of each foundation sensing node according to a fixed time period;
and step 3: the ground-based sensing center generates a matrix scheduling table according to a priority strategy agreed in advance, in combination with a time delay requirement and a bandwidth requirement, the matrix scheduling table comprises a data uplink scheduling table and a data downlink scheduling table, and the data downlink scheduling table is sent to the ground-based sensing center;
and 4, step 4: and the ground-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and uploads the data through the ground-based sensing center. And the space-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and downlink through the space-based sensing center.
Further, the ground sensing center is a ground control center corresponding to a space-based backbone network node, such as a relay satellite ground control station; the ground sensing node comprises ground control centers corresponding to the spacecrafts.
The technical scheme for solving the technical problems is as follows: the space-based foundation scheduling cooperative operation mode is used for scheduling network resources by using space-ground cooperation depending on the condition that both the space-based sensing node and the foundation sensing node have task requirements, and comprises the following steps:
step 1: the task requirements of the sensing nodes are counted by the space-based sensing node and the foundation sensing node every other fixed time period;
step 2: the space-based sensing center collects information such as task bandwidth requirements, time delay requirements and the like of each space-based sensing node according to a fixed time period; the method comprises the following steps that a foundation sensing center collects information such as task bandwidth requirements and time delay requirements of each foundation sensing node according to a fixed time period;
and step 3: and the space-based sensing center reasonably arranges network resources according to the task requirements of the space-based sensing nodes and records the bandwidth of the residual network resources and corresponding time slots.
And 4, step 4: the space-based sensing center issues the information of the residual network resource bandwidth and the corresponding time slot to the ground sensing center;
and 5: and the ground sensing center reasonably arranges the bandwidth and the time slot of the ground sensing node according to the condition of the residual network resources issued by the space-based sensing center.
Further, the network communication resources of the space-based sensing center and the ground-based sensing center can be divided into downlink bandwidth resources from the space-based sensing center to the ground-based sensing center and uplink bandwidth resources from the ground-based sensing center to the space-based sensing center, and the uplink bandwidth resources and the downlink bandwidth resources can be respectively scheduled.
The invention has the beneficial effects that: the invention provides a space information network resource double-layer scheduling model based on a crowd sensing technology and a space information network, wherein the model is divided into a space-based scheduling center and a ground-based scheduling center, and the reliability and the stability of real-time end-to-end transmission capacity optimization under large space-time span are greatly improved.
The technical scheme for solving the technical problems is as follows: a space-based scheduling center comprises at least one space-based sensing node and a space-based sensing center;
and the space-based sensing node counts the task requirements of a fixed time period and sends the task requirements to a space-based sensing center.
And the space-based sensing center allocates network resources according to the acquired task requirements of each sensing node, generates a scheduling table, and then specifically and sequentially provides relay service for each sensing node according to the scheduling table.
The technical scheme for solving the technical problems is as follows: a ground dispatching center comprises at least one ground sensing node and a ground sensing center;
the ground sensing node counts task requirements of a fixed time period, generates a task request table and periodically sends the task request table to a ground sensing center;
and the ground sensing center receives the residual network resource information of the space-based sensing center, allocates network resources according to the acquired task requirements of each ground sensing node, generates a scheduling table, and then sequentially provides services for each sensing node according to the scheduling table.
The technical scheme for solving the technical problems is as follows: a spatial information network resource double-layer scheduling system comprises the space-based scheduling center and the ground-based scheduling center.
The invention has the beneficial effects that: the invention provides a space information network resource double-layer scheduling system based on a crowd sensing technology, which divides a space information network into a space-based scheduling center and a ground-based scheduling center. According to different task requirements, real-time scheduling of space network resources is completed at a relay satellite or a relay satellite ground station, and the bandwidth utilization rate and throughput of a space information network are effectively improved.
Drawings
Fig. 1 is a flowchart of a spatial information network resource double-layer scheduling method according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a spatial information network resource double-layer scheduling method according to embodiment 2 of the present invention;
fig. 3 is a diagram of a spatial information network double-layer scheduling model according to an embodiment of the present invention;
FIG. 4 is a matrix schedule according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a crowd sensing model;
fig. 6 is a schematic diagram of a spatial information network resource scheduling system according to a specific example of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a spatial information network resource double-layer scheduling method according to embodiment 1 of the present invention is applied to a space-based scheduling center, and includes the following steps:
step 1: the space-based sensing node counts task requirements of the sensing node every other fixed time period;
step 2: the space-based sensing center collects information such as task bandwidth requirements, time delay requirements and the like of each space-based sensing node according to a fixed time period;
and step 3: the space-based sensing center generates a matrix scheduling table according to a priority strategy agreed in advance, in combination with a time delay requirement and a bandwidth requirement, the matrix scheduling table comprises a data uplink scheduling table and a data downlink scheduling table, and the data uplink scheduling table is sent to the ground sensing center;
and 4, step 4: and the space-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and downlink the data through the space-based sensing center. And the ground-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and uploads the data through the ground-based sensing center.
The space-based sensing center is a space-based backbone network node and can provide data transfer and distribution services, such as a relay satellite; the space-based sensing nodes comprise high, medium and low orbit spacecrafts and near-ground aircrafts.
After the space-based sensing center collects task requirements, the tasks are classified according to the priorities of the tasks, the priorities are divided, a matrix scheduling table of the tasks is generated according to the sequence of the priorities, and data transmission service is provided for the sensing nodes according to the scheduling table.
The matrix scheduling table is a matrix period formed by a plurality of basic periods, each basic period is used for arranging one time slot or a plurality of time slots for the sensing nodes, and each time slot is of a fixed length.
In each basic period of the scheduling table, time resources are divided into a plurality of time intervals, and usually some idle time slots are reserved in each BC period, so that the scheduling table is convenient for inserting emergency tasks when sensing the sudden service demands of nodes.
As shown in fig. 2, a spatial information network resource double-layer scheduling method according to embodiment 1 of the present invention is applied to a space-based scheduling center, and includes the following steps:
step 1: the method comprises the steps that a foundation sensing node counts task requirements of the sensing node every other fixed time period;
step 2: the method comprises the following steps that a foundation sensing center collects information such as task bandwidth requirements and time delay requirements of each foundation sensing node according to a fixed time period;
and step 3: the ground-based sensing center generates a matrix scheduling table according to a priority strategy agreed in advance, in combination with a time delay requirement and a bandwidth requirement, the matrix scheduling table comprises a data uplink scheduling table and a data downlink scheduling table, and the data downlink scheduling table is sent to the ground-based sensing center;
and 4, step 4: and the ground-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and uploads the data through the ground-based sensing center. And the space-based sensing center authorizes corresponding time slots at each sensing node according to the scheduling table to acquire data and downlink through the space-based sensing center.
The ground sensing center is a ground control center corresponding to the space-based backbone network node, such as a relay satellite ground control station; the ground sensing node comprises ground control centers corresponding to the spacecrafts.
A space-based scheduling center comprises at least one space-based sensing node and a space-based sensing center;
the space-based sensing nodes can directly receive task requirements issued by the corresponding ground control center, and can directly communicate with the ground control center by using own data uplink and downlink channels when the current space-based sensing nodes are within the visual range of the domestic earth station; otherwise, the space-based sensing node needs to apply for bandwidth time slot resources to the space-based sensing center, and uplink and downlink of data are carried out through the space-based sensing center.
A ground dispatching center comprises at least one ground sensing node and a ground sensing center;
the ground sensing node receives the task requirement, converts the task requirement into an instruction task, and sends the instruction task to the ground sensing center;
and the ground sensing center sends the instruction task to the space-based sensing node through the space-based sensing center.
As shown in fig. 3 and 4, the technical solution of the present invention for solving the above technical problems is as follows: a spatial information network resource double-layer scheduling system comprises the space-based scheduling center and the ground-based scheduling center.
Specifically, the space-based sensing center is a relay satellite. The space-based sensing node comprises a spacecraft and a near-ground aircraft. The ground sensing center is a relay satellite ground control station; the ground-based sensing node comprises a spacecraft ground user station and a near space layer aircraft ground user station.
Fig. 5 is a schematic diagram of a crowd sensing model, which describes the crowd sensing model, and the model mainly includes a crowd sensing center and sensing nodes, and the sensing center has functions of task collection, data processing, data forwarding, and the like. Different from the traditional wireless sensing network, the space information network based on the crowd sensing technology has the characteristics of dynamic change of sensing nodes, wide coverage area, dynamic change of topological structure, complex space environment, large time delay, large data volume and the like. Based on the characteristics, the invention provides a spatial information network resource double-layer scheduling method and system based on crowd sensing.
Because the network nodes of the spatial information network double-layer scheduling model based on crowd sensing are various aircrafts, satellites with various functions and the like, the spatial positions of the network nodes are not fixed, and information links among the nodes in the network are not fixed, the network structure is dynamically changed. In the present invention, there are two types of aircraft: one type is a spacecraft, the operation is stable, the spacecraft has a specific orbit, and communication links among the spacecraft and the spacecraft are predictable; the other type is a near space aircraft, the maneuverability is strong, the motion track is unstable, and unpredictable interruption can occur in communication links among the near space aircraft.
The invention provides a space information network resource double-layer scheduling system based on the crowd sensing technology by taking the crowd sensing technology as a guide, comprising a space-based scheduling center and a foundation scheduling center (the foundation scheduling center takes a ground master control center as a sensing center, a relay satellite ground control station as a foundation sensing center of the crowd sensing space information network, each ground station foundation scheduling center as a sensing node, the space-based scheduling center takes a space information network backbone network node relay satellite as the sensing center of the crowd sensing space information network, and a space layer spacecraft and a near-earth aircraft as the sensing nodes, wherein the space-based scheduling center only takes a user spacecraft of a data relay satellite in the space information network as the sensing node, namely a GEO spacecraft with the orbit position outside the sight distance of the domestic earth stations and NGEO with the real-time data transmission requirement, measurement and control and data are implemented by the domestic earth station through relay satellite transfer; the emergency treatment of various orbit spacecrafts with the emergency treatment requirement of events beyond the sight distance of the domestic earth station can be implemented by the domestic earth station through data satellite transfer.
As shown in fig. 6, a schematic diagram of two-layer scheduling of spatial information network resources according to an embodiment of the present invention, taking space-based cooperative scheduling as an example, includes: the ground sensing node serving as the ground control center of each satellite issues task requirements to the ground sensing center; each space layer spacecraft serves as a space-based sensing node to issue task demands to a space-based sensing center, and the space-based sensing center arranges a task matrix scheduling table and issues the task matrix scheduling table to the ground-based sensing center in a mode of preferentially serving the space-based sensing nodes. And the ground-based sensing center analyzes the scheduling table to obtain the residual time slots, adds the tasks of the ground-based sensing nodes, generates a new matrix scheduling table, and sends the new matrix scheduling table to the space-based sensing center. And the space-based sensing center and the ground-based sensing center respectively provide network services for the sensing nodes at the authorized time slots according to the scheduling tables.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A double-layer scheduling method of spatial information network resources is applied to a space-based scheduling center and is characterized by comprising the following steps:
step 1: the space-based sensing node counts task requirements of the sensing node every other fixed time period;
step 2: the space-based sensing center collects task bandwidth requirement and time delay requirement information of each space-based sensing node according to a fixed time period;
and step 3: the space-based sensing center generates a matrix scheduling table according to a priority strategy agreed in advance, in combination with a time delay requirement and a bandwidth requirement, the matrix scheduling table comprises a data uplink scheduling table and a data downlink scheduling table, and the data uplink scheduling table is sent to the ground-based sensing center;
and 4, step 4: the ground-based sensing center analyzes the matrix scheduling table to obtain the residual time slots, adds the tasks of ground-based sensing nodes, generates a new matrix scheduling table, sends the new matrix scheduling table to the space-based sensing center, and the space-based sensing center authorizes corresponding time slots at each space-based sensing node according to the scheduling table to acquire data and downloads the data through the space-based sensing center; and the ground-based sensing center authorizes a corresponding time slot at each ground-based sensing node according to the scheduling table to acquire data and transmits the data to the ground-based sensing center in an uplink mode.
2. The method as claimed in claim 1, wherein the space-based sensing node further sends ID and location information of the space-based sensing node to a space-based sensing center.
3. The double-layer scheduling method for spatial information network resources according to claim 1, wherein the classification and the prioritization are performed, and data transmission services are provided for the space-based sensing nodes and the ground-based sensing nodes according to the order of the priorities.
4. The double-layer scheduling method for spatial information network resources according to claim 1, wherein the space-based sensing center is a space-based backbone network node and is capable of providing data transfer and distribution services; the space-based sensing node comprises a spacecraft and a near-ground aircraft.
5. A double-layer scheduling method of spatial information network resources is applied to a ground-based scheduling center and is characterized by comprising the following steps:
step 1: the method comprises the steps that a foundation sensing node counts task requirements of the sensing node every other fixed time period;
step 2: the method comprises the steps that a foundation sensing center collects task bandwidth requirement and time delay requirement information of each foundation sensing node according to a fixed time period;
and step 3: the ground-based sensing center generates a matrix scheduling table according to a priority strategy agreed in advance, in combination with a time delay requirement and a bandwidth requirement, the matrix scheduling table comprises a data uplink scheduling table and a data downlink scheduling table, and the data downlink scheduling table is sent to the ground-based sensing center;
and 4, step 4: the ground sensing center authorizes a corresponding time slot at each ground sensing node according to the scheduling table to acquire data, and the data are uplinked through the ground sensing center; and the space-based sensing center authorizes a corresponding time slot at each space-based sensing node according to the scheduling table to acquire data and downlink through the space-based sensing center.
6. The method according to claim 5, wherein the ground-based sensing center is a ground control center corresponding to a space-based backbone network node, and the ground control center is: a relay satellite ground control station; the ground sensing node comprises ground control centers corresponding to the spacecrafts.
7. A double-layer scheduling method of spatial information network resources is applied to scheduling network resources by using space-ground cooperation, and is characterized by comprising the following steps:
step 1: the task requirements of the sensing nodes are counted by the space-based sensing node and the foundation sensing node every other fixed time period;
step 2: the space-based sensing center collects task bandwidth requirement and time delay requirement information of each space-based sensing node according to a fixed time period; the method comprises the steps that a foundation sensing center collects task bandwidth requirement and time delay requirement information of each foundation sensing node according to a fixed time period;
and step 3: the space-based sensing center reasonably arranges network resources according to task requirements of the space-based sensing nodes, and records the bandwidth of the residual network resources and corresponding time slots;
and 4, step 4: the space-based sensing center issues the information of the residual network resource bandwidth and the corresponding time slot to the ground sensing center;
and 5: and the ground sensing center reasonably arranges the bandwidth and the time slot of the ground sensing node according to the condition of the residual network resources issued by the space-based sensing center.
8. The method according to claim 7, wherein the network communication resources of the space-based sensing center and the ground-based sensing center are divided into downlink bandwidth resources from the space-based sensing center to the ground-based sensing center and uplink bandwidth resources from the ground-based sensing center to the space-based sensing center, and the uplink bandwidth resources and the downlink bandwidth resources are respectively scheduled.
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