CN115314102B - Mobile switching management method suitable for multi-satellite networking - Google Patents
Mobile switching management method suitable for multi-satellite networking Download PDFInfo
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- CN115314102B CN115314102B CN202211194610.0A CN202211194610A CN115314102B CN 115314102 B CN115314102 B CN 115314102B CN 202211194610 A CN202211194610 A CN 202211194610A CN 115314102 B CN115314102 B CN 115314102B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/26—Resource reservation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a mobile switching management method suitable for multi-satellite networking, relates to the field of satellite communication, and aims to meet service continuous communication in a satellite terminal cross-satellite switching scene. The method is characterized in that a terminal node is provided with a multi-beam phased array antenna and two-way demodulation, an inter-satellite forwarding path is established in advance by a target satellite, wireless communication resources are reserved, and the lossless switching of service data from a current satellite to the target satellite is realized. The invention is suitable for high and low orbit multi-satellite networks with on-satellite processing, can realize cross-satellite non-inductive switching of users in the service communication process, and ensures long-term, continuous and reliable communication of services.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a mobile switching management method suitable for multi-satellite networking, which can be used for realizing cross-satellite switching management of a satellite terminal in a high-orbit satellite network and a low-orbit satellite network and solving the problem of service non-inductive switching in a cross-satellite communication scene of the satellite terminal.
Background
Satellite communications have been developed for over half a century. Satellite communication has become one of the irreplaceable core communication means because it has a series of advantages of global coverage, no restriction by ground obstacles, rapid deployment and the like, can provide stable communication capability for multiple users crossing the intercontinental region and the ocean, and can also provide effective information transmission in sudden events of regions with unpredictable places, times and intensities. Satellite communication technology also becomes an important index for measuring the core competitiveness of a country.
The signal coverage range of a single satellite is limited, and a constellation can be formed by a plurality of satellites with different orbits so as to expand the coverage range and achieve global seamless coverage. Because the middle and low orbit satellites have relative motion with respect to the earth surface; meanwhile, the satellite terminal may have a large range of position movement in the communication process, which may result in inter-satellite handover. In order to maintain communication quality, a satellite terminal needs to switch an accessed satellite according to factors such as satellite signal strength, visibility and the like, and continuity of services are guaranteed in the switching process.
At present, in the traditional satellite communication technology, a hard switching mode is mostly adopted for cross-satellite switching, certain data loss is generated, and the requirement of long-time, continuous and reliable communication of a user in a multi-satellite networking scene is difficult to meet.
Disclosure of Invention
In view of this, the present invention provides a mobile handover management method suitable for a multi-satellite networking, which can be used for a high-low orbit multi-satellite network with on-satellite processing, so as to implement cross-satellite non-inductive handover of a user in a service communication process, and ensure long-term, continuous and reliable communication of a service.
In order to achieve the purpose, the invention adopts the technical scheme that:
a mobile switching management method suitable for multi-satellite networking is applied to high and low orbit satellite networks of the multi-satellite networking; the high-orbit satellite network and the low-orbit satellite network comprise terminal nodes and satellite nodes, wherein the terminal nodes are provided with a multi-beam phased array antenna and a two-way demodulation, the satellite nodes are provided with a satellite-borne network control, and the satellite nodes are interconnected in a single-hop mode through an inter-satellite link or in a double-hop mode through a ground gateway station through a feeder link; the mobile handover management procedure comprises the following steps:
A. the cross-satellite switching is actively initiated by a local terminal node, and after a switched target satellite node is determined, a position updating application is reported to a satellite-borne network control of the current satellite node;
B. the satellite-borne network control of the current satellite node retrieves the session information of the local terminal node, and applies for synchronization to the satellite-borne network control of the target satellite node through inter-satellite cooperative position updating;
C. the satellite-borne network control of the target satellite node prestores session information of the local terminal node, and reserves a paging beam under the target satellite node for the local terminal node, and the beam information is fed back to the satellite-borne network control of the current satellite node through inter-satellite cooperation position updating notification;
D. the satellite-borne network control of the current satellite node sends a position updating notice to the local terminal node and sends paging beam information reserved by the destination satellite node;
E. the satellite-borne network control of the current satellite node retrieves the end-to-end service which is communicated by the local terminal node, and applies for synchronization to the satellite-borne network control of the target satellite node through inter-satellite cooperative service switching;
F. the satellite-borne network control of the target satellite node extracts information of an opposite terminal satellite node and an opposite terminal node of an end-to-end service, reserves service beams and wireless resources required by communication for a local terminal node, establishes an inter-satellite forwarding path from the target satellite node to the opposite terminal satellite node, and regenerates a link identification of the end-to-end service;
G. the satellite-borne network control of the target satellite node sends inter-satellite cooperation context update to the satellite-borne network control of the opposite-end satellite node, and carries a new link identifier of an end-to-end service; meanwhile, the satellite-borne network control of the target satellite node sends an inter-satellite cooperative service switching notice to the satellite-borne network control of the current satellite node, and the notice carries a new link identification of an end-to-end service and end-to-end service communication resource information reserved by the target satellite node;
H. the satellite-borne network control of the opposite terminal satellite node sends a context update notice to the opposite terminal node and issues a new link identifier of an end-to-end service; the satellite-borne network control of the current satellite node sends a service switching notice to a local terminal node, and issues a new link identification of an end-to-end service and end-to-end service communication resource information reserved by a target satellite node;
I. after receiving the service switching notification, the local terminal node sends a service switching confirmation to a satellite-borne network control of the current satellite node, and waits for receiving end-to-end service data from an opposite terminal node under a target satellite node;
J. after receiving the context updating notification, the opposite terminal node sends context updating completion to a satellite-borne network control of the opposite satellite node, delays for a period of time, and uses a new link identification mark to mark end-to-end service data to the local terminal node and sends the end-to-end service data to the opposite satellite node;
K. the end-to-end service data marked by the new link identification is forwarded to the target satellite node from the opposite end satellite node according to a new inter-satellite forwarding path;
l, after the local terminal node determines that all end-to-end service data which are communicated are received under a target satellite node, the local terminal node uses a new link identification mark to mark the end-to-end service data which are sent to an opposite terminal node, and sends the end-to-end service data to the target satellite node;
m, the end-to-end service data marked by the new link identification is forwarded to the opposite end satellite node from the target satellite node according to a new inter-satellite forwarding path;
n, the local terminal node sends a position updating confirmation to a satellite-borne network control of a target satellite node;
and O, the satellite-borne network control of the target satellite node sends a position updating completion notice to the satellite-borne network control of the current satellite node, and the satellite-borne network control of the current satellite node releases all communication resources of the local terminal node to complete the cross-satellite switching.
Further, in the step a, the local terminal node judges whether to initiate a cross-satellite handover according to the geographical position information of the local terminal node and the satellite ephemeris.
Further, in step a, before initiating a handover, the local terminal node generates dual beams using the multi-beam phased array antenna, and searches for a signal of an available handover destination satellite node using a backup beam; and if a plurality of candidate destination satellite nodes exist, the local terminal node selects the destination satellite node with the best downlink quality.
Further, in step a, after the local terminal node selects the destination satellite node, it first uses the backup demodulation to complete downlink synchronization and satellite-ground announcement reception under the destination satellite node, and then sends a location update application to the satellite-borne network control of the current satellite node.
Further, in step E, each end-to-end service has two link identifiers, one for marking the data flow from the local end node to the correspondent end node, and the other for marking the data flow from the correspondent end node to the local end node.
Further, in step F, when an inter-satellite forwarding path from the destination satellite node to the opposite-end satellite node is established, an inter-satellite forwarding table of each satellite node on the inter-satellite forwarding path is configured, where the inter-satellite forwarding table is composed of a link identifier and an egress port number.
Further, in step M, after the end-to-end service data reaches the destination satellite node, the destination satellite node queries the inter-satellite forwarding table by using the marked link identifier, and determines a port number, thereby forwarding the end-to-end service data.
Further, in step N, if the satellite-borne network control of the destination satellite node does not receive the location update confirmation, the pre-established inter-satellite forwarding path from the destination satellite node to the opposite-end satellite node and all communication resources of the pre-allocated local terminal node on the destination satellite node are released.
Compared with the background art, the invention has the following beneficial effects:
1. the invention can realize that the satellite terminal completes the data switching from the current satellite to the target satellite on the premise of not interrupting the current service, thereby ensuring the continuity and continuity of the service.
2. The invention can realize the self-negotiation among a plurality of satellites to complete the inter-satellite path establishment, the wireless resource reservation and the service context update, thereby improving the reliability and the survivability of the multi-satellite network.
Drawings
Fig. 1 is a schematic view of an application scenario of the method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
A mobile switching management method suitable for a multi-satellite networking is shown in an application scene of the method in figure 1, wherein a satellite network is a low-orbit satellite network and comprises terminal nodes and satellite nodes, and the terminal nodes are configured with a multi-beam phased array antenna and two-way demodulation and are responsible for initiating switching application and determining switching opportunity of service data; the satellite nodes are configured with satellite-borne network control, are interconnected through an inter-satellite link in a single-hop mode or through a feeder link in a double-hop mode through a ground gateway station, and are responsible for establishing an inter-satellite forwarding path in advance and reserving wireless communication resources.
The method specifically comprises the following steps:
A. the cross-satellite switching is actively initiated by a local terminal node, and after a switched target satellite node is determined, a position updating application is reported to a satellite-borne network control of the current satellite node;
the local terminal node judges whether to initiate cross-satellite switching according to the geographical position information and the satellite ephemeris of the local terminal node. Before initiating switching, a local terminal node generates dual beams by using a multi-beam phased array antenna, and searches for a signal of an available switching target satellite node by using a standby beam; and if a plurality of candidate destination satellite nodes exist, the local terminal node selects the destination satellite node with the best downlink quality. After the local terminal node selects the target satellite node, firstly, the standby demodulation is used for completing downlink synchronization and satellite-ground announcement receiving under the target satellite node, and then, a position updating application is sent to a satellite-borne network control of the current satellite node.
B. The satellite-borne network control of the current satellite node retrieves the session information of the local terminal node, and applies for synchronization to the satellite-borne network control of the target satellite node through inter-satellite cooperative position updating;
C. the satellite-borne network control of the target satellite node prestores session information of the local terminal node, and reserves a paging beam under the target satellite node for the local terminal node, and the beam information is fed back to the satellite-borne network control of the current satellite node through inter-satellite cooperation position updating notification;
D. the satellite-borne network control of the current satellite node sends a position updating notice to the local terminal node and issues paging beam information reserved by the destination satellite node;
E. the satellite-borne network control of the current satellite node retrieves the end-to-end service which is communicated by the local terminal node, and applies for synchronization to the satellite-borne network control of the target satellite node through inter-satellite cooperative service switching;
the end node may have multiple end-to-end services communicating. Each path of end-to-end service has two link identifications, one for marking the data flow direction from the local terminal node to the opposite terminal node, and the other for marking the data flow direction from the opposite terminal node to the local terminal node.
F. The satellite-borne network control of the target satellite node extracts information of an opposite terminal satellite node and an opposite terminal node of an end-to-end service, reserves service beams and wireless resources required by communication for a local terminal node, establishes an inter-satellite forwarding path from the target satellite node to the opposite terminal satellite node, and regenerates a link identification of the end-to-end service;
when an inter-satellite forwarding path from a target satellite node to an opposite-end satellite node is established, an inter-satellite forwarding table of each satellite node on the inter-satellite forwarding path is configured, and the inter-satellite forwarding table is composed of a link identifier and an exit port number.
G. A satellite-borne network control of a target satellite node sends inter-satellite cooperation context update to a satellite-borne network control of an opposite-end satellite node, and carries a new link identification of an end-to-end service; meanwhile, the satellite-borne network control of the target satellite node sends an inter-satellite cooperative service switching notice to the satellite-borne network control of the current satellite node, and the notice carries a new link identification of the end-to-end service and end-to-end service communication resource information reserved by the target satellite node;
H. a satellite-borne network control of an opposite terminal satellite node sends a context updating notice to an opposite terminal node and issues a new link identification of an end-to-end service; the satellite-borne network control of the current satellite node sends a service switching notice to a local terminal node, and issues a new link identifier of an end-to-end service and end-to-end service communication resource information reserved by a target satellite node;
I. after receiving the service switching notification, the local terminal node sends a service switching confirmation to a satellite-borne network control of the current satellite node, and waits for receiving end-to-end service data from an opposite terminal node under a target satellite node;
J. after receiving the context updating notification, the opposite terminal node sends the context updating completion to a satellite-borne network control of the opposite satellite node, delays for a period of time (such as 1 second), uses a new link identification mark to mark end-to-end service data to the local terminal node, and sends the end-to-end service data to the opposite satellite node;
K. the end-to-end service data marked by the new link identification is forwarded to the target satellite node from the opposite-end satellite node according to a new inter-satellite forwarding path;
l, after the local terminal node determines that all end-to-end service data which are communicated are received under a target satellite node, the local terminal node uses a new link identification mark to mark the end-to-end service data which are sent to an opposite terminal node, and sends the end-to-end service data to the target satellite node;
m, the end-to-end service data marked by the new link identification is forwarded to the opposite end satellite node from the target satellite node according to a new inter-satellite forwarding path;
after the end-to-end service data reaches the destination satellite node, the destination satellite node uses the marked link identifier to query the inter-satellite forwarding table, and determines the port number, so as to forward the data.
N, the local terminal node sends a position updating confirmation to a satellite-borne network control of a target satellite node; if the satellite-borne network control of the target satellite node does not receive the position updating confirmation after 60 seconds from the sending of the inter-satellite cooperative position updating notification, releasing the pre-established inter-satellite forwarding path from the target satellite node to the opposite terminal satellite node and all communication resources of the pre-distributed local terminal node on the target satellite node;
and O, the satellite-borne network control of the target satellite node sends a position updating completion notice to the satellite-borne network control of the current satellite node, and the satellite-borne network control of the current satellite node releases all communication resources of the local terminal node to complete cross-satellite switching.
In short, the multi-beam phased array antenna and the two-way demodulation are configured at the terminal node, the inter-satellite forwarding path is established in advance by the target satellite, wireless communication resources are reserved, and the service data can be switched from the current satellite to the target satellite without loss. The invention is suitable for high and low orbit multi-satellite networks with on-satellite processing, can realize cross-satellite non-inductive switching of users in the service communication process, ensures long-term, continuous and reliable communication of services, and meets the service continuous communication requirement of a satellite terminal under a cross-satellite switching scene.
It will be appreciated by those of ordinary skill in the art that the methods of the present invention may be carried out by hardware or software in association with program instructions which, when executed, perform steps comprising the method embodiments described above.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the above embodiments, or equivalent substitutions and modifications may be made to other features of the embodiments, and any modifications, equivalents, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A mobile switching management method suitable for multi-satellite networking is characterized by being applied to high and low orbit satellite networks of the multi-satellite networking; the high-orbit satellite network and the low-orbit satellite network comprise terminal nodes and satellite nodes, wherein the terminal nodes are provided with a multi-beam phased array antenna and a two-way demodulation, the satellite nodes are provided with a satellite-borne network control, and the satellite nodes are interconnected in a single-hop mode through an inter-satellite link or in a double-hop mode through a ground gateway station through a feeder link; the mobile handover management procedure comprises the steps of:
A. the cross-satellite switching is actively initiated by a local terminal node, and after a switched target satellite node is determined, a position updating application is reported to a satellite-borne network control of the current satellite node;
B. the satellite-borne network control of the current satellite node retrieves the session information of the local terminal node, and applies for synchronization to the satellite-borne network control of the target satellite node through inter-satellite cooperative position updating;
C. the satellite-borne network control of the target satellite node prestores session information of the local terminal node, and reserves a paging beam under the target satellite node for the local terminal node, and the beam information is fed back to the satellite-borne network control of the current satellite node through inter-satellite cooperation position updating notification;
D. the satellite-borne network control of the current satellite node sends a position updating notice to the local terminal node and sends paging beam information reserved by the destination satellite node;
E. the satellite-borne network control of the current satellite node retrieves the end-to-end service which is communicated by the local terminal node, and applies for synchronization to the satellite-borne network control of the target satellite node through inter-satellite cooperative service switching;
F. the method comprises the steps that a satellite-borne network of a target satellite node extracts information of an opposite terminal satellite node and an opposite terminal node of an end-to-end service, wireless resources required by communication are reserved for a local terminal node, the wireless resources comprise service beams, an inter-satellite forwarding path from the target satellite node to the opposite terminal satellite node is established, and a link identification of the end-to-end service is regenerated;
G. the satellite-borne network control of the target satellite node sends inter-satellite cooperation context update to the satellite-borne network control of the opposite-end satellite node, and carries a new link identifier of an end-to-end service; meanwhile, the satellite-borne network control of the target satellite node sends an inter-satellite cooperative service switching notice to the satellite-borne network control of the current satellite node, and the notice carries a new link identification of the end-to-end service and end-to-end service communication wireless resources reserved by the target satellite node;
H. the satellite-borne network control of the opposite terminal satellite node sends a context update notice to the opposite terminal node and issues a new link identifier of an end-to-end service; the satellite-borne network control of the current satellite node sends a service switching notice to a local terminal node, and issues a new link identification of an end-to-end service and end-to-end service communication wireless resources reserved by a target satellite node;
I. after receiving the service switching notification, the local terminal node sends a service switching confirmation to a satellite-borne network control of the current satellite node, and waits for receiving end-to-end service data from an opposite terminal node under a target satellite node;
J. after receiving the context updating notification, the opposite terminal node sends context updating completion to a satellite-borne network control of the opposite satellite node, delays for a period of time, and uses a new link identification mark to mark end-to-end service data to the local terminal node and sends the end-to-end service data to the opposite satellite node;
K. the end-to-end service data marked by the new link identification is forwarded to the target satellite node from the opposite end satellite node according to a new inter-satellite forwarding path;
l, after the local terminal node determines that all end-to-end service data which are communicated are received under a target satellite node, the local terminal node uses a new link identification mark to mark the end-to-end service data which are sent to an opposite terminal node, and sends the end-to-end service data to the target satellite node;
m, the end-to-end service data marked by the new link identification is forwarded to the opposite end satellite node from the target satellite node according to a new inter-satellite forwarding path;
n, the local terminal node sends a position updating confirmation to a satellite-borne network control of a target satellite node;
and O, the satellite-borne network control of the target satellite node sends a position updating completion notice to the satellite-borne network control of the current satellite node, and the satellite-borne network control of the current satellite node releases all communication resources of the local terminal node to complete the cross-satellite switching.
2. The mobile handoff management method suitable for multi-satellite networking according to claim 1, wherein in step a, the local terminal node determines whether to initiate a cross-satellite handoff according to its geographical location information and satellite ephemeris.
3. The method according to claim 2, wherein in step a, before initiating handover, the local terminal node generates dual beams using a multi-beam phased array antenna, and searches for signals of available handover destination satellite nodes using backup beams; and if a plurality of candidate destination satellite nodes exist, the local terminal node selects the destination satellite node with the best downlink quality.
4. The method according to claim 3, wherein in step a, after the local terminal node selects the destination satellite node, the backup demodulation is first used to complete downlink synchronization and satellite-to-ground announcement reception at the destination satellite node, and then the location update application is sent to the satellite-borne network control of the current satellite node.
5. The mobility management method for multi-satellite networks according to claim 4, wherein in step E, each end-to-end service has two link identifiers, one for marking the data flow from the local end node to the correspondent end node, and the other for marking the data flow from the correspondent end node to the local end node.
6. The method of claim 5, wherein in step F, when an inter-satellite forwarding path is established from the destination satellite node to the opposite-end satellite node, an inter-satellite forwarding table of each satellite node on the inter-satellite forwarding path is configured, and the inter-satellite forwarding table is composed of a link identifier and an egress port number.
7. The method according to claim 6, wherein in step M, after the end-to-end service data arrives at the destination satellite node, the destination satellite node uses the marked link id to query the inter-satellite forwarding table, and determines the port number, so as to forward the data.
8. The method as claimed in claim 7, wherein in step N, if the spaceborne network of the destination satellite node does not receive the location update confirmation, the pre-established inter-satellite forwarding path from the destination satellite node to the opposite end satellite node and all communication resources of the pre-allocated local terminal node on the destination satellite node are released.
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