CN116155370B - Distributed mobility management method for low-orbit satellite data link - Google Patents
Distributed mobility management method for low-orbit satellite data link Download PDFInfo
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- CN116155370B CN116155370B CN202310449327.6A CN202310449327A CN116155370B CN 116155370 B CN116155370 B CN 116155370B CN 202310449327 A CN202310449327 A CN 202310449327A CN 116155370 B CN116155370 B CN 116155370B
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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
- H04B7/18519—Operations control, administration or maintenance
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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
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the technical field of mobility management of a low-orbit satellite data link system, and discloses a distributed mobility management method of a low-orbit satellite data link, which comprises the following steps: s100, constructing a plurality of virtual service areas; s200, defining a satellite service area address to represent a satellite coverage geographic area, a mobile user access point address to represent a satellite access domain, a user private address to represent a user equipment domain, and a mobile satellite address to represent a satellite operation area; s300, setting a position storage table in a satellite; s400, setting a local mobile position storage table and a wide area mobile position storage table in the satellite; s500, the satellite updates the satellite position by using the position storage table, and updates the user position by using the local mobile position storage table and the wide area mobile position storage table; s600, when paging occurs, paging is carried out on the target user; the method reduces network overhead of distributed mobility management based on the virtual service area, and effectively reduces multi-hop broadcast overhead of location update.
Description
Technical Field
The invention relates to the technical field of mobility management of low-orbit satellite data link systems, in particular to a distributed mobility management method of a low-orbit satellite data link.
Background
The low orbit satellite data link system (LEO Datalink: low Earth Orbit Datalink) is high-rise and down-the-ground, and constructs a net according to the sky, so that the constraint of geographic topography can be effectively overcome, and wireless access and relay transmission services comparable with ground data links can be provided for the air, the open sea, the mountain, the barren origin, the remote location and the like. The typical low-orbit satellite data chain system consists of a low-orbit satellite constellation carrying a data chain load, a network management station, a gateway station and a user terminal. The low orbit satellite constellation is mainly deployed on a near-earth orbit 500-2000 km away from the ground, and has the advantages of lower communication delay, more available bandwidth, lower power consumption of the on-orbit satellite, higher available network capacity of the whole network and the like.
The low orbit satellite mobility management is an important technical content, and the main objective is to provide the position information of the called terminal for the satellite communication system and ensure the continuity of communication. This is because the satellite's sub-satellite area is not constant during low orbit satellite orbit, and the satellite needs to be constantly handed off between the user terminal and ground stations during operation. Typically, when the satellite orbit altitude is 1000 km, the duration of a single connection between the satellite and the ground station can last only around 10 minutes. In order to maintain network connectivity, end users need to frequently handoff between different service satellites, as well as satellites between different ground stations. At present, mobility management of a low orbit satellite network is centralized or semi-distributed, a user terminal depends on a ground gateway station to register and update a position, and the problems of single point failure, poor expandability, long time delay, high signaling overhead and the like exist.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a distributed mobility management method of a low-orbit satellite data link, which can implement a distributed mobility management strategy and solve the problems of difficult deployment, prolonged signaling exchange and large signaling overhead of the existing mobility management.
In order to achieve the above object, the present invention provides the following technical solutions:
a method for distributed mobility management of a low-orbit satellite data chain, comprising: s100, constructing a plurality of virtual service areas, wherein each virtual service area consists of a plurality of satellites, and each satellite is loaded with a calculation load; s200, defining a satellite service area address to represent a satellite coverage geographic area, a mobile user access point address to represent a satellite access domain, a user private address to represent a user equipment domain, and a mobile satellite address to represent a satellite operation area, wherein the virtual service area address represents a virtual service area, the virtual service area address is statically bound with the satellite service area address, the mobile satellite address is dynamically bound with the virtual service area address, and the user private address is dynamically bound with the mobile user access point address; s300, setting a position storage table in a satellite, wherein the position storage table stores a virtual service area address, a satellite member list and a lifetime, the virtual service area address is used for identifying a virtual service area number corresponding to a current satellite service area, the satellite member list is used for recording a mobile satellite number belonging to the current service area, and the lifetime is used for recording the residual service time of each member satellite in the service area; s400, setting a local mobile position storage table and a wide area mobile position storage table in the satellite, wherein the local mobile position storage table stores dynamic binding relations between mobile user access point addresses and user private addresses, and the wide area mobile position storage table stores dynamic binding relations between satellite service area addresses and user private addresses; s500, the satellite updates the satellite position by using the position storage table, and updates the user position by using the local mobile position storage table and the wide area mobile position storage table; s600, when paging occurs, paging is carried out for the target user.
In the present invention, it is preferable that the communication between satellites in S500 and S600 adopts a fisheye-state routing policy.
In the present invention, preferably, the virtual service area is composed of 2 own orbit satellites and 1 to 4 adjacent orbit satellites, and the satellites communicate with each other at high speed through inter-satellite links to form a one-hop adjacent relationship.
In the present invention, preferably, the location storage table further includes a next virtual service area address.
In the present invention, it is preferable that the satellite position updating by using the position storage table includes: s501, the satellite determines a satellite service area address according to the current orbit position, and initially registers a virtual service area address corresponding to the satellite service area address in a position storage table; s502, the satellite periodically polls the virtual service area address, compares the inquired virtual service area address with the current virtual service area boundary, if the inquired virtual service area address does not reach the current virtual service area boundary, the next round of polling detection is continued, and if the inquired virtual service area address reaches the current virtual service area boundary, S503 is executed; s503, the satellite broadcasts a service registration message in the next virtual service area, and broadcasts a service cancellation message in the current virtual service area; and S504, the satellite receives the broadcast service registration message and the service cancellation message from other satellites, adds the other satellites of the broadcast service registration message to the satellite member list, and synchronously deletes the other satellites of the broadcast service cancellation message from the satellite member list.
In the present invention, preferably, the updating of the user location using the local mobile location storage table and the wide area mobile location storage table includes: s505, the satellite updates a local mobile position storage table according to the current access user, adds the user private address of the current access user into the local mobile position storage table, and marks the binding relation between the mobile user access point address and the user private address of the current access user; s506, the satellite synchronizes the local mobile position storage table to other satellites in the virtual service area; s507, when the attribution satellite of the user changes, the corresponding relation between the old attribution satellite and the new attribution satellite and the user is updated respectively.
In the present invention, preferably, the updating of the correspondence between the old home satellite and the new home satellite and the user terminal includes: s5071, when the change of the attributive satellite of the user occurs in the same virtual service area, the local mobile position storage table of the old attributive satellite deletes the information of the user, the local mobile position storage table of the new attributive satellite increases the information of the user, and the old attributive satellite and the new attributive satellite synchronize the updated local mobile position storage tables to other satellites in the virtual service area respectively; s5072, when the change of the attributive satellite of the user occurs between the adjacent virtual service areas, the local mobile position storage table and the wide area mobile position storage table of the old attributive satellite respectively delete the information of the user, the local mobile position storage table and the wide area mobile position storage table of the new attributive satellite respectively increase the information of the user, and the old attributive satellite and the new attributive satellite respectively synchronize the respectively updated local mobile position storage table and the wide area mobile position storage table to other satellites in the virtual service areas.
In the present invention, preferably, the satellite service area address is encoded according to the geographic area served by the satellite, the mobile user access point address is encoded according to the constellation number of the low orbit satellite, and the user private address is encoded according to the data link end capacity of the user segment.
In the present invention, preferably, paging the destination user in S600 includes: s601, a calling user initiates a destination user inquiry to a satellite access point to which the calling user belongs, the satellite access point to which the calling user belongs initiates a destination user inquiry to a satellite to which the calling user belongs, the satellite to which the calling user belongs inquires a destination user in a local mobile position storage table, and if so, the destination user access point address to which the destination user belongs is returned; if not, executing S602; s602, a satellite to which a calling user belongs queries a target user in a wide area mobile position storage table maintained in a virtual service area, and if the target user is queried, the mobile user access point address to which the target user belongs is returned; if not, executing S603; s603, the satellite to which the calling user belongs initiates a destination user inquiry to an adjacent virtual service area, the satellite of the adjacent virtual service area inquires the destination user in a wide area mobile position storage table maintained by the virtual service area, if so, the mobile user access point address to which the destination user belongs is returned; if not, the destination user inquiry is continuously initiated to the next adjacent virtual service area, and the like until the destination user is inquired, and the satellite inquired the destination user returns the virtual service area address, the forwarding path and the mobile user access point address to which the destination user belongs.
A computer readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of distributed mobility management of a low orbit satellite data chain of any of the above.
Compared with the prior art, the invention has the beneficial effects that:
1. the cloud virtual service area mechanism is adopted, the same-orbit and different-orbit adjacent satellites are connected through the inter-satellite links which are connected at high speed, a virtual service entity for satellite service area management is constructed, real-time position updating can be carried out based on the cloud storage mechanism, the satellite and user mobility in the service area are synchronously managed, and the cloud virtual service area on the satellite can solve the problems of difficult station arrangement of ground gateway stations, prolonged signaling, high signaling overhead and the like.
2. The hierarchical position management method is adopted to divide the position codes of the data chain users into 3 levels: the service area address, the access point address and the user equipment address respectively correspond to wide area mobility, local mobility and user identification, and the service area address, the access point address and the user address are decoupled in a layering manner, so that satellite switching and position updating caused by satellite mobility and user mobility can be distinguished, and an orderly dynamic binding relationship is realized; the method can control the mobility management complexity of the user within a limited range, so that the high-frequency local mobility switching can be quickly and synchronously updated, and the low-frequency cross-domain mobility switching is only exchanged within the adjacent area range, thereby reducing the network overhead of the distributed mobility management based on the virtual service area.
3. By adopting the location updating limited diffusion method, the home service area of the mobile user carries out close range propagation of the neighbor service area through a fisheye state routing policy (Fish-eye State Routing, FSR) and is used for assisting the neighbor area to carry out location query of the target user, on one hand, the hop-by-hop location query of the remote user can be supported, and on the other hand, the multi-hop broadcast overhead of the location updating can be effectively reduced.
Drawings
Fig. 1 is a flowchart of a distributed mobility management method for a low-orbit satellite data chain according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of user address hierarchy management.
Fig. 3 is a flowchart of a method for distributed mobility management of low-orbit satellite data chains according to another embodiment of the present invention, in which a location storage table is used for satellite location update.
FIG. 4 is a schematic diagram of a process flow for satellite location update using a location storage table.
Fig. 5 is a flowchart of a method for distributed mobility management of low-orbit satellite data chains according to another embodiment of the present invention, in which a local mobile location storage table and a wide-area mobile location storage table are used for updating a user location.
Fig. 6 is a flowchart of updating the correspondence between the old home satellite and the new home satellite and the user terminal in another embodiment of the distributed mobility management method of the low-orbit satellite data chain according to the present invention.
Fig. 7 is a schematic diagram of a process flow of updating the correspondence between the old home satellite and the new home satellite and the user terminal when the home satellite of the user changes and switches.
Fig. 8 is a flow chart of paging a destination user in another embodiment of the distributed mobility management method of the low-orbit satellite data chain of the present invention.
Fig. 9 is a schematic diagram of a process flow for paging a destination user.
Fig. 10 is a system schematic diagram of a distributed mobility management method for a low-orbit satellite data chain according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a preferred embodiment of the present invention provides a distributed mobility management method for a low-orbit satellite data link, which includes:
s100, constructing a plurality of virtual service areas, wherein each virtual service area consists of a plurality of satellites, and each satellite is loaded with a calculation load.
The virtual service area (Clouded Virtual Service Gateway, C-VSG) is formed by mutually adjacent satellite constellations to form a local full-communication relation, so that the neighborhood information can be shared and transferred conveniently. Typically, the virtual service area may be formed by 2 own-orbit satellites and 1 to 4 adjacent-orbit satellites, which communicate with each other at high speed via Inter-Satellite Link (ISL) to form a one-hop adjacency.
And between satellites carrying low-power consumption and small-sized edge computing loads, local network management information can be synchronized through a high-speed inter-satellite link, distributed network management based on small-sized edge cloud computing is realized, and a virtual service area based on edge cloud is formed.
S200, defining a satellite service area address to represent a satellite coverage geographic area, a mobile user access point address to represent a satellite access domain, a user private address to represent a user equipment domain, a mobile satellite address to represent a satellite operation area, a virtual service area address to represent a virtual service area, wherein the virtual service area address is statically bound with the satellite service area address, the mobile satellite address is dynamically bound with the virtual service area address, and the user private address is dynamically bound with the mobile user access point address.
Specifically, the hierarchical address management mechanism of a mobile user includes 3 layers: satellite service area addresses (Service Zone Point, SZP), mobile user access point addresses (Mobile user Access Point, MAP), user private addresses (User Identification, UID), addresses corresponding to satellite coverage geographical areas, satellite access domains and user equipment domains, respectively, and their encoding formats, as shown in fig. 2. In addition, mobile satellite addresses (Mobile Satellite Point, MSP) are defined to represent satellite operating areas, i.e. specific positions of satellites in orbit.
The satellite service area address is encoded according to the geographical area of satellite service, and the maximum addressing of 16bit is 2 16 =65536 geographical areas. In the region address coding range, the specific ground segment satellite service area has a one-to-one correspondence with the virtual service area addresses (Virtual Service Gateway, VSG) of the space segment, so that the seamless coverage of the space segment to the ground segment is ensured.
The mobile user access point address is encoded according to the constellation number of the low orbit satellite, and the maximum 16bit can be marked with 2 16 The number of satellites is 65536, which is far greater than the current low-orbit satellite constellation planning capacity, and the reserved addressing space can be expanded for future constellations. In the satellite movement process, a dynamic binding relation exists between a satellite address and a virtual service area of a space segment, and dynamic coverage of a mobile satellite to a satellite service area of a specific ground segment is represented.
The private address of the user codes according to the capacity of the data link end of the user section, and the maximum 15bit can be marked with 2 15 -1 = 32767 data link user equipment addresses. The remaining address space is reserved for multicast addresses or special purposes.
The virtual service area address and the satellite service area address are binding relations of static configuration, and represent one-to-one mapping relations of space segment service area addresses and ground segment service area addresses. The mobile satellite address and the virtual service area address are in dynamic binding relation, and the mobile satellite enters and leaves a specific virtual service area and needs to register and cancel in a corresponding cloud service virtual gateway. The user private address and the mobile user access point address are in a dynamic binding relationship, when the mobile user switches satellites or satellite beams, the corresponding satellite access point needs to update the position of the mobile user, and synchronizes management information to the attributive virtual service area.
The hierarchical address management mechanism realizes decoupling of the ground segment address, the space segment address and the user segment address of the low-orbit satellite data chain communication system, and can support flexible address dynamic binding relation.
S300, setting a position storage table in the satellite, wherein the position storage table stores a virtual service area address, a satellite member list and a lifetime, the virtual service area address is used for identifying a virtual service area number corresponding to a current satellite service area, the satellite member list is used for recording mobile satellite numbers belonging to the current service area, and the lifetime is used for recording the residual service time of each member satellite in the service area.
The low orbit satellite has a short earth-surrounding flight period, and the typical duration of single service for a specific satellite service area is not more than 10 minutes, so that satellite mobility management needs to be performed on a fixed satellite service area, namely, satellite mobility management of a virtual service area of a space segment, including the virtual service area entry and exit operations of a mobile satellite.
In the virtual service area, the position storage table of the satellite mainly comprises elements such as virtual service area addresses, satellite member lists, survival time and the like. The virtual service area address is used for identifying a virtual service area number corresponding to the current service area, the satellite member list is used for recording mobile satellite numbers belonging to the current service area, and the lifetime is used for recording the residual service time of each member satellite in the virtual service area.
Optionally, the location storage table may also contain the next virtual service area address for service area address handoff when the satellite reaches the service area boundary.
S400, setting a local mobile position storage table and a wide area mobile position storage table in the satellite, wherein the local mobile position storage table stores dynamic binding relations between mobile user access point addresses and user private addresses, and the wide area mobile position storage table stores dynamic binding relations between satellite service area addresses and user private addresses.
Satellite handoff or beam handoff may result when the satellite moves or the user terminal moves. To ensure the accuracy and validity of the paging address, the location of the user needs to be updated into the distributed network management server.
Typically, the user's location storage information includes at least a satellite service area address, a mobile user access point address, and a user private address. In order to reduce the storage overhead of the local satellite and the network overhead caused by remote satellite position inquiry, the three layers of positions can be divided into two tables for storage, a wide area mobile position storage table (Globlal Mobile Table, GMT) stores the dynamic binding relation between the satellite service area address and the user private address, and a local mobile position storage table (Local Mobile Table, LMT) stores the dynamic binding relation between the mobile user access point address and the user private address, so that the transregional mobility and the intra-service area mobility of the mobile user are respectively reflected.
S500, the satellite updates the satellite position by using the position storage table, and updates the user position by using the local mobile position storage table and the wide area mobile position storage table.
The satellite can calculate and map to the preplanned satellite position area through ephemeris, then determine the satellite service area address, through the binding relation of satellite service area address and virtual service area address, user private address and mobile user access point address, the information such as satellite service area address that mobile user access point address locates, can update position memory table, local mobile position memory table, wide area mobile position memory table, namely has realized the renewal to satellite position and user position.
S600, when paging occurs, paging is carried out for the target user.
The low orbit satellite data link system needs to support unicast relay transmission service, when the calling user pages the destination address of the called user, the preferred routing strategy can be adopted to perform the cross-region position inquiry of progressive increment, such as the fisheye state routing strategy.
The domain address of the mobile user and the dynamic binding relation thereof are managed through a layering mechanism, the fisheye state routing strategy (Fish-eye State Routing, FSR) is adopted to address, route and update the satellite access point of the mobile user, and the position update in a limited range can reduce the signaling overhead of inter-satellite routing update and destination user paging. The fish-eye state routing strategy is a proactive ad hoc network routing protocol, which uses the fish-eye technology to update the routes of nodes with different distances with different frequencies, and the route packets are only exchanged between adjacent nodes, thereby reducing the control overhead of the route. By properly selecting the fisheye-range hierarchy and radius size, relatively accurate routing information may be provided. In this embodiment, in other words, the communication between the satellites in S500 and S600 adopts a fisheye state routing policy, when information update is performed between the satellites, instead of adopting a mode that one satellite directly broadcasts to all other satellites in the virtual non-service, the information to be updated is sent to one or more satellites adjacent to the satellite by a certain policy, the information is shared between the adjacent one or more satellites, when the information needs to be invoked, the invoking information can be transmitted step by step between the satellites, when the invoking information is queried, the transmitting is stopped, and the information needing to be invoked is returned to the demand end, so that the policy can reduce a great amount of expenditure caused by broadcasting between the satellites, and achieve the purpose of saving communication resources.
According to the full-distributed on-board mobility management method based on the cloud virtual service area, the domain address of the mobile user and the dynamic binding relation of the domain address are managed through a layering mechanism, the addressing, routing and access point updating of the mobile user are performed, the position updating is performed within a limited range, and signaling overhead of inter-board routing updating and destination user paging can be reduced.
In a preferred embodiment of the present invention, as shown in fig. 3, the step of updating the satellite position using the position storage table includes:
s501, the satellite determines a satellite service area address according to the current orbit position, and initially registers a virtual service area address corresponding to the satellite service area address in a position storage table.
Specifically, the satellite calculates a satellite service area address corresponding to a satellite point below the satellite according to the current orbit position, initially registers a virtual service area address corresponding to a service area, starts virtual cloud service, and prepares to receive mobility event updates of other satellites in the virtual service area.
S502, the satellite periodically polls the virtual service area address, compares the queried virtual service area address with the current virtual service area boundary, if the queried virtual service area address does not reach the current virtual service area boundary, continues to carry out next round of polling detection, and if the queried virtual service area address reaches the current virtual service area boundary, S503 is executed.
When the satellite moves according to the preset orbit, periodic polling is carried out, the current position of the satellite lower point is calculated according to ephemeris, and the position is compared with the boundary of the current virtual service area, so that the virtual service area entering and exiting operation is triggered. If the virtual service area boundary is not reached, the next round of polling detection is continued.
S503, the satellite broadcasts a service registration message in the next virtual service area, and broadcasts a service cancellation message in the current virtual service area.
And S504, the satellite receives the broadcast service registration message and the service cancellation message from other satellites, adds the other satellites of the broadcast service registration message to the satellite member list, and synchronously deletes the other satellites of the broadcast service cancellation message from the satellite member list.
The process flow for satellite location update using the location memory table can be seen in fig. 4.
And triggering satellite movement event updating if the satellite movement reaches the boundary of the current virtual service area. Firstly, broadcasting a service registration message in the next virtual service area, informing other satellites in the next virtual service area to perform synchronous registration update, and adding the satellite to respective satellite member lists. And broadcasting service cancellation information in the current service area, informing other satellites in the service area to perform synchronous cancellation update, and synchronously deleting the satellite from respective satellite member lists.
In the satellite running process, if a satellite movement event in the service area is detected, satellite adding or deleting operation is carried out according to the satellite movement event type. If the service registration message is a service registration message, an adding operation is performed to add the new home satellite to the own satellite member list. If the service cancellation message is the service cancellation message, a deleting operation is performed, and the old home satellite is deleted from the satellite member list.
As shown in fig. 5, the user location update using the local mobile location storage table and the wide area mobile location storage table includes:
s505, the satellite updates the local mobile position storage table according to the current access user, adds the user private address of the current access user into the local mobile position storage table, and identifies the binding relationship between the mobile user access point address and the user private address of the current access user.
S506, the satellite synchronizes the local mobile position storage table of the satellite to other satellites in the virtual service area.
In order to address the mobile user access points of the users, the satellites synchronize own local mobile position storage tables to the virtual service areas, and other satellites in the virtual service areas synchronously update own local mobile position storage tables, so that the distributed storage of the access point addresses of all the users in the service areas is realized.
S507, when the attribution satellite of the user changes, the corresponding relation between the old attribution satellite and the new attribution satellite and the user is updated respectively.
When the satellite moves or the user terminal moves, satellite switching may be caused, so that the corresponding relation between the user and the old home satellite and the new home satellite needs to be further updated, that is, the old home satellite deletes the user, and the new home satellite adds the user.
Specifically, as shown in fig. 6, updating the correspondence between the old home satellite and the new home satellite and the user terminal includes:
s5071, when the change of the attributive satellite of the user occurs in the same virtual service area, the local mobile position storage table of the old attributive satellite deletes the information of the user, the local mobile position storage table of the new attributive satellite increases the information of the user, and the old attributive satellite and the new attributive satellite synchronize the updated local mobile position storage tables to other satellites in the virtual service area respectively.
Satellite handoffs that occur within the same virtual service area, which may be referred to as local satellite handoffs, the user's location update involves only updates within the virtual service area. The specific operation is that the local mobile position storage list of the old home satellite deletes the information of the user (namely, the item of the user in the local mobile position storage list can also be called user list item), and the local mobile position storage list of the new home satellite increases the information of the user. And synchronizing the updated local mobile position storage table to other satellites in the virtual service area, and updating the attribution satellite of the user by the other satellites in time.
S5072, when the change of the attributive satellite of the user occurs between the adjacent virtual service areas, the local mobile position storage table and the wide area mobile position storage table of the old attributive satellite respectively delete the information of the user, the local mobile position storage table and the wide area mobile position storage table of the new attributive satellite respectively increase the information of the user, and the old attributive satellite and the new attributive satellite respectively synchronize the respectively updated local mobile position storage table and the wide area mobile position storage table to other satellites in the virtual service areas.
The home satellite variation of the user terminal occurs between adjacent virtual service areas, i.e. a handover, where the location update of the user involves a wide area address handover of both virtual service areas. The satellite updates the local mobile position storage table firstly, the local mobile position storage table of the old attribution satellite deletes the information of the user, the local mobile position storage table of the new attribution satellite increases the information of the user, and the new attribution satellite synchronizes with other satellites of the attribution virtual service area respectively.
The satellite updates the wide area mobile position storage table, the wide area mobile position storage table of the old attribution satellite deletes the information of the user, the wide area mobile position storage table of the new attribution satellite increases the information of the user, and the wide area mobile position storage table of the new attribution satellite is respectively synchronized with other satellites of the attribution virtual service area.
When the user changes the home satellite, the process flow of updating the corresponding relation between the old home satellite and the new home satellite and the user terminal can be seen in fig. 7. Referring to fig. 10, in the drawings, S1 to S18 are all low-orbit satellites, satellites S1, S2, S7, S8 form a virtual service area VSG-1, satellites S3, S4, S9, S10 form a virtual service area VSG-2, satellites S5, S6, S11, S12 form a virtual service area VSG-3, and a user identified as "SZP-2; map-4; uid-2" shows a process of switching from the satellite service area SZP-2 to the satellite service area SZP-3.
In the embodiment, the address of the virtual service area of the satellite is updated by using the position storage table arranged on the satellite, and the satellites in the virtual service area are synchronized, so that the repeated communication of mobility information between the satellite and the ground station is not needed, and the network overhead is reduced; by adopting the mobile user position management method with separated local mobility and wide area mobility, the mobility management complexity of the user can be controlled within a limited range, so that the high-frequency local mobility switching can be updated rapidly and synchronously, the low-frequency cross-domain mobility switching is only exchanged within the range of the adjacent cell, and the network overhead of the distributed mobility management based on the virtual service area is reduced.
As shown in fig. 8, in a preferred embodiment of the present invention, paging the destination user includes:
s601, a calling user initiates a destination user inquiry to a satellite access point to which the calling user belongs, the satellite access point to which the calling user belongs initiates a destination user inquiry to a satellite to which the calling user belongs, the satellite to which the calling user belongs inquires a destination user in a local mobile position storage table, and if so, the destination user access point address to which the destination user belongs is returned; if not, S602 is performed.
When the calling user carries out addressing communication to the destination user, the mobile user access point to which the calling user belongs needs to firstly carry out position inquiry of the destination user attribution virtual service area and the mobile user access point, and then inquires the core network route of the satellite according to the destination address so as to initiate paging to the destination user. The satellite to which the calling user belongs firstly queries the target user in the local mobile position storage table, and if the target user is queried, the mobile user access point address of the target user is returned to support satellite relay transmission in the virtual service area. If the target user is not inquired, the target user is inquired in a wide area mobile position storage table maintained by the virtual service area, and the home virtual service area of the target user is searched in the table.
S602, a satellite to which a calling user belongs queries a target user in a wide area mobile position storage table maintained in a virtual service area, and if the target user is queried, the mobile user access point address to which the target user belongs is returned; if not, S603 is performed.
S603, the satellite to which the calling user belongs initiates a destination user inquiry to an adjacent virtual service area, the satellite of the adjacent virtual service area inquires the destination user in a wide area mobile position storage table maintained by the virtual service area, if so, the mobile user access point address to which the destination user belongs is returned; if not, the destination user inquiry is continuously initiated to the next adjacent virtual service area, and the like until the destination user is inquired, and the satellite inquired the destination user returns the virtual service area address, the forwarding path and the mobile user access point address to which the destination user belongs.
The wide area mobile position storage table maintained by the virtual service area stores the mobile user access point address to which the user of the adjacent virtual service area belongs, and if the inquiry is invalid, an inquiry request is initiated to the adjacent virtual service area for searching the wide area mobile position storage table maintained by the next-hop virtual neighbor area. If the query is valid, returning a query result; if the query is invalid, the position query is continuously initiated to the next-hop virtual service area.
And when the position inquiry of the adjacent virtual service areas or the multi-hop adjacent virtual service areas is effective, returning a position inquiry result to the calling attribution satellite along a reverse path, and returning the virtual service area address and the forwarding path to which the target user belongs to, wherein the virtual service area address and the forwarding path are used for supporting a paging path based on inter-satellite routing.
The process flow of paging the destination user can be seen in fig. 9. Referring also to FIG. 10, the users identified as "SZP-1", "MAP-2", "UID-1" are calling users, the users identified as "SZP-3", "MAP-6", "UID-3" are destination users, and these two users show the process of calling the destination users.
According to the method for paging the target user, the on-board network management processing based on the virtual service area can achieve full-distributed mobility management independent of the ground gateway station, a fisheye state routing strategy is adopted, hierarchical position management and low-overhead position update are supported, and network management efficiency of distributed network management is improved.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the processes of the distributed mobility management method embodiment of the low-orbit satellite data chain, and can achieve the same technical effects, so that repetition is avoided and no further description is given here. Among them, a computer readable storage medium such as Read-Only Memory (ROM), random access Memory (Random Access Memory RAM), magnetic disk or optical disk, and the like.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.
Claims (6)
1. A method for distributed mobility management of a low-orbit satellite data chain, comprising:
s100, constructing a plurality of virtual service areas, wherein the virtual service areas are composed of a plurality of satellites, and each satellite is loaded with a calculation load;
s200, defining a satellite service area address to represent a satellite coverage geographic area, a mobile user access point address to represent a satellite access domain, a user private address to represent a user equipment domain, a mobile satellite address to represent a satellite operation area, and a virtual service area address to represent a virtual service area, wherein the virtual service area address is statically bound with the satellite service area address, the mobile satellite address is dynamically bound with the virtual service area address, and the user private address is dynamically bound with the mobile user access point address;
s300, setting a position storage table in a satellite, wherein the position storage table stores a virtual service area address, a satellite member list and a lifetime, the virtual service area address is used for identifying a virtual service area number corresponding to a current satellite service area, the satellite member list is used for recording a mobile satellite number belonging to the current service area, and the lifetime is used for recording the residual service time of each member satellite in the service area; the position storage table also comprises a next virtual service area address, and the next virtual service area address is used for switching the service area address when the satellite reaches the service area boundary;
s400, setting a local mobile position storage table and a wide area mobile position storage table in the satellite, wherein the local mobile position storage table stores dynamic binding relation between a mobile user access point address and a user private address, and the wide area mobile position storage table stores dynamic binding relation between a satellite service area address and the user private address;
s500, the satellite updates the satellite position by using the position storage table, and updates the user position by using the local mobile position storage table and the wide area mobile position storage table;
the updating satellite positions by using the position storage table comprises:
s501, the satellite determines a satellite service area address according to the current orbit position, and initially registers a virtual service area address corresponding to the satellite service area address in a position storage table;
s502, the satellite periodically polls the virtual service area address, compares the inquired virtual service area address with the current virtual service area boundary, if the inquired virtual service area address does not reach the current virtual service area boundary, the next round of polling detection is continued, and if the inquired virtual service area address reaches the current virtual service area boundary, S503 is executed;
s503, the satellite broadcasts a service registration message in the next virtual service area, and broadcasts a service cancellation message in the current virtual service area;
s504, the satellite receives the broadcast service registration message and the service cancellation message from other satellites, adds the other satellites of the broadcast service registration message to the satellite member list, and synchronously deletes the other satellites of the broadcast service cancellation message from the satellite member list;
the updating of the user location using the local mobile location storage table and the wide area mobile location storage table comprises:
s505, the satellite updates a local mobile position storage table according to the current access user, adds the user private address of the current access user into the local mobile position storage table, and marks the binding relation between the mobile user access point address and the user private address of the current access user;
s506, the satellite synchronizes the local mobile position storage table to other satellites in the virtual service area;
s507, when the attribution satellite of the user changes, the old attribution satellite and the new attribution satellite update the corresponding relation between the old attribution satellite and the new attribution satellite;
the updating of the corresponding relation between the old attribution satellite and the new attribution satellite and the user terminal respectively comprises the following steps:
s5071, when the change of the attributive satellite of the user occurs in the same virtual service area, the local mobile position storage table of the old attributive satellite deletes the information of the user, the local mobile position storage table of the new attributive satellite increases the information of the user, and the old attributive satellite and the new attributive satellite synchronize the updated local mobile position storage tables to other satellites in the virtual service area respectively;
s5072, when the change of the attributive satellite of the user occurs between adjacent virtual service areas, the local mobile position storage table and the wide area mobile position storage table of the old attributive satellite respectively delete the information of the user, the local mobile position storage table and the wide area mobile position storage table of the new attributive satellite respectively increase the information of the user, and the old attributive satellite and the new attributive satellite respectively synchronize the respectively updated local mobile position storage table and the wide area mobile position storage table to other satellites in the virtual service areas;
s600, when paging occurs, paging is carried out for the target user.
2. The method of claim 1, wherein the communication between the satellites in S500 and S600 uses a fisheye-state routing strategy.
3. The method of claim 1, wherein the virtual service area is formed by 3 to 6 satellites in orbit and adjacent satellites in orbit, and the satellites communicate with each other at high speed through inter-satellite links to form a one-hop adjacency.
4. The method of claim 1, wherein the satellite service area address is encoded according to a geographical area served by the satellite, the mobile user access point address is encoded according to a constellation number of the low-orbit satellite, and the user private address is encoded according to a data link end capacity of the user segment.
5. The method of claim 1, wherein paging the destination user in S600 comprises:
s601, a calling user initiates a destination user inquiry to a satellite access point to which the calling user belongs, the satellite access point to which the calling user belongs initiates a destination user inquiry to a satellite to which the calling user belongs, the satellite to which the calling user belongs inquires a destination user in a local mobile position storage table, and if so, the destination user access point address to which the destination user belongs is returned; if not, executing S602;
s602, a satellite to which a calling user belongs queries a target user in a wide area mobile position storage table maintained in a virtual service area, and if the target user is queried, the mobile user access point address to which the target user belongs is returned; if not, executing S603;
s603, the satellite to which the calling user belongs initiates a destination user inquiry to an adjacent virtual service area, the satellite of the adjacent virtual service area inquires the destination user in a wide area mobile position storage table maintained by the virtual service area, if so, the mobile user access point address to which the destination user belongs is returned; if not, the destination user inquiry is continuously initiated to the next adjacent virtual service area, and the like until the destination user is inquired, and the satellite inquired the destination user returns the virtual service area address, the forwarding path and the mobile user access point address to which the destination user belongs.
6. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the distributed mobility management method of a low orbit satellite data chain according to any one of claims 1 to 5.
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