CN112566035A - Terminal position management method for satellite communication network - Google Patents
Terminal position management method for satellite communication network Download PDFInfo
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- CN112566035A CN112566035A CN202011277331.1A CN202011277331A CN112566035A CN 112566035 A CN112566035 A CN 112566035A CN 202011277331 A CN202011277331 A CN 202011277331A CN 112566035 A CN112566035 A CN 112566035A
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- terminal
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5007—Internet protocol [IP] addresses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
Abstract
The invention discloses a terminal position management method for a satellite communication network.A gateway station maintains a terminal position table, the terminal position table comprises a plurality of sub-tables, each sub-table corresponds to a satellite in the satellite communication network and comprises terminal information of all satellites which are initially accessed into the satellite; for a terminal newly added into a satellite communication network, a gateway station takes an initial access satellite identifier of the terminal as an index, finds a corresponding sub-table of the satellite in a terminal position table, allocates an address associated with the initial access satellite identifier for the terminal, and adds a table entry corresponding to the terminal in the sub-table, wherein the table entry at least comprises the address allocated by the gateway station for the terminal, the terminal identifier and a current access satellite identifier; the address associated with the initial access satellite identifier acquired by the terminal remains unchanged after the terminal accesses the satellite communication network. The invention improves the efficiency of inquiring the position of the gateway station terminal on the premise of ensuring the continuity of network communication.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a terminal position management method for a satellite communication network.
Background
In a satellite communications network, the access satellites of terrestrial user terminals may change dynamically. On one hand, the user terminal can be a fixed terminal or a mobile terminal, and if the user terminal is the mobile terminal, the access satellite may change along with the movement of the access satellite; on the other hand, for non-GEO systems, the movement of the satellite node may also cause the access satellite of the user terminal to change. Therefore, in the satellite communication network, it is necessary to perform location management of the terminal, that is, to maintain a mapping between the terminal and its access satellite so that the packet can be correctly delivered to the destination at the time of data transfer.
In order to achieve convergence of the satellite communication network and the terrestrial network, the terrestrial user terminal is usually addressed using an IP address. IP address addressing belongs to hierarchical addressing and includes a network prefix and a host number. The addressing method of the user terminal in the prior art is mainly divided into the following two methods:
1. and a flat addressing mode which does not reflect the hierarchical relation of addresses. When a flat addressing mode is adopted, the address of the terminal is kept unchanged when the terminal moves, so that adverse effects caused by the change of the IP address of the terminal in the communication process can be avoided; however, the IP address assigned by each terminal is not hierarchical, resulting in a large computational overhead for the gateway station to look up the table.
2. The hierarchical addressing mode is used for partitioning the earth surface, and different network prefixes are allocated to the terminal in different partitions; when the terminal moves from the current partition to another partition, the IP address needs to be reallocated, and the process of reallocating the IP address may adversely affect communication continuity.
Disclosure of Invention
Aiming at the problem of terminal addressing in the conventional satellite communication network, the invention provides a terminal position management method for the satellite communication network, which improves the inquiry efficiency of the terminal position of a gateway station on the premise of ensuring the continuity of network communication.
The invention protects a terminal position management method used for satellite communication network, the gateway station maintains a terminal position table, the terminal position table includes several sub-tables, each sub-table corresponds to a satellite in the satellite communication network, include all terminal information taking the satellite as the initial access satellite; each satellite and each terminal have unique identification;
for a terminal newly added into a satellite communication network, a gateway station takes an initial access satellite identifier of the terminal as an index, finds a corresponding sub-table of the satellite in a terminal position table, allocates an address associated with the initial access satellite identifier for the terminal, and adds a table entry corresponding to the terminal in the sub-table, wherein the table entry at least comprises the address allocated by the gateway station for the terminal, the terminal identifier and a current access satellite identifier; the address associated with the initial access satellite identifier acquired by the terminal remains unchanged after the terminal accesses the satellite communication network.
Further, the gateway station recovers the address assigned to the terminal when the terminal leaves the satellite communication network.
Further, the initial address assignment process when the terminal joins the satellite communication network includes the following steps:
step A1, when a terminal newly joins in a satellite communication network, sending an address application message to a gateway station, wherein the message comprises a terminal identifier and an initial access satellite identifier;
step A2, the gateway station extracts the initial access satellite identification in the address application message, uses the initial access satellite identification as the index, finds the sub-table corresponding to the satellite in the terminal position table, allocates an address associated with the initial access satellite identification for the terminal, and adds a table entry corresponding to the terminal in the sub-table;
step A3, the gateway station sends an address reply message to the terminal or the access satellite thereof, wherein the message contains the terminal identification and the terminal address.
Further, when the access satellite of the terminal changes, the access satellite updating process comprises the following steps:
step B1, the terminal or the current access satellite sends a position notification message to the gateway station, the message contains the terminal address and the current access satellite identification;
step B2, the gateway station acquires the terminal initial access satellite identification through the terminal address, and uses it as index, finds the sub-table corresponding to the initial access satellite in the terminal position table, looks up the table entry corresponding to the terminal in the sub-table, and updates the current access satellite identification.
Further, the inquiry process of one terminal or the current access satellite of the terminal to the current access satellite of another terminal comprises the following steps:
step C1, the inquiry terminal or the current access satellite thereof sends a position inquiry message to the gateway station, the message contains the address of the inquired terminal;
step C2, the gateway station acquires the initial access satellite identification of the inquired terminal through the inquired terminal address, and uses it as index, finds the sub-table corresponding to the initial access satellite in the terminal position table, searches the table item corresponding to the inquired terminal in the sub-table, and inquires the current access satellite identification;
and step C3, the gateway station sends a position reply message to the inquiry terminal or the access satellite thereof, wherein the message contains the address of the inquired terminal and the identification of the current access satellite of the inquired terminal.
The invention also protects a satellite communication network using the terminal position management method.
The invention carries out hierarchical addressing on the terminal, but different network prefixes are distributed to the terminal according to the earth surface partition which possibly changes aiming at a mobile individual in the prior art, but different network prefixes are distributed to the terminal by the initial access satellite identification when the terminal is newly added into the satellite communication network, and the initial access satellite when the terminal is newly added into the satellite communication network can be uniquely determined. Even if the terminal sends movement or the access satellite moves, so that the access satellite of the terminal changes, the terminal address is always kept unchanged, the initial access satellite can be known through the terminal address, and the current access satellite of the terminal can be accurately and quickly searched in the sub-table corresponding to the initial access satellite by combining with the terminal position table maintained by the gateway station. Because the terminal address is kept unchanged after one-time allocation, the continuity and the reliability of network communication can be better ensured even if the access satellite of the terminal is changed.
Drawings
FIG. 1 is a schematic diagram of a terminal A, a terminal B and an access satellite thereof;
FIG. 2 is a schematic diagram of initial address assignment;
FIG. 3 is a schematic diagram of an access satellite update;
fig. 4 is a schematic diagram of access satellite polling.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Example 1
A gateway station maintains a terminal position table, which contains several sub-tables, each sub-table corresponding to a satellite in the satellite communication network, and contains all terminal information using the satellite as initial access satellite. Each satellite and each terminal has a unique identity.
The terminal location table is set forth below in connection with table 1. S1, S2, S3 denote satellite identifiers; GUID _1, GUID _2, GUID _3, and GUID _4 represent terminal identifications; terminal address 10.P1.P2.P3, where P1 corresponds to its initial access satellite identification. Thus, as can be seen from table 1, the terminal GUID _1 is currently accessed to the satellite S1, and the gateway station assigns a terminal address of 10.1.0.1; the terminal GUID _2 is currently accessed to the satellite S1, and the gateway station allocates a terminal address of 10.1.0.2; the terminal GUID _3 is currently accessed to the satellite S2, and the gateway station allocates a terminal address of 10.2.0.1; the terminal GUID _4 is currently accessed to the satellite S3 and the gateway station assigns a terminal address of 10.3.0.1. Of course, the situation in table 1 is that the current access satellites of all terminals are the initial access satellites.
TABLE 1
For a terminal newly added into a satellite communication network, a gateway station takes an initial access satellite identifier of the terminal as an index, finds a corresponding sub-table of the satellite in a terminal position table, allocates an address associated with the initial access satellite identifier for the terminal, and adds a table entry corresponding to the terminal in the sub-table, wherein the table entry at least comprises the address allocated by the gateway station for the terminal, the terminal identifier and a current access satellite identifier; the address associated with the initial access satellite identifier acquired by the terminal remains unchanged after the terminal accesses the satellite communication network.
The invention carries out hierarchical addressing on the terminal, but different network prefixes are distributed to the terminal according to the earth surface partition which possibly changes aiming at a mobile individual in the prior art, but different network prefixes are distributed to the terminal by the initial access satellite identification when the terminal is newly added into the satellite communication network, and the initial access satellite when the terminal is newly added into the satellite communication network can be uniquely determined. Even if the terminal sends movement or the access satellite moves, so that the access satellite of the terminal changes, the terminal address is always kept unchanged, the initial access satellite can be known through the terminal address, and the current access satellite of the terminal can be accurately and quickly searched in the sub-table corresponding to the initial access satellite by combining with the terminal position table maintained by the gateway station. Because the terminal address is kept unchanged after one-time allocation, the continuity and the reliability of network communication can be better ensured even if the access satellite of the terminal is changed.
In order to save address resources, the gateway station recovers the address assigned to the terminal when it leaves the satellite communication network.
The following describes, in connection with an example, an initial address assignment process when a terminal newly joins a satellite communication network, an access satellite update process when an access satellite of the terminal changes, and an inquiry process of a terminal or its current access satellite with respect to another terminal's current access satellite.
Initial address allocation process when terminal joins satellite communication network
Referring to fig. 1 and 2, a terminal a newly joins the satellite communication network at time t0, a terminal B newly joins the satellite communication network at time t1, and the initial allocation process of the terminal address is as follows:
the terminal A sends an address application message to the gateway station at the time of t0, the address application message is initially accessed to the satellite identifier S1, the gateway station finds the corresponding sub-table 1 in the terminal position table according to the identifier S1, allocates an unused IP address 10.1.1.1 to the terminal A, adds the table entry corresponding to the terminal A in the sub-table 1, and then sends an address reply message to the terminal A.
The terminal B sends an address application message to the gateway station at the time t1, the address application message is initially accessed to the satellite identifier S3, the gateway station finds the corresponding sub-table 3 in the terminal position table according to the identifier S3, allocates an unused IP address 10.3.1.1 to the terminal B, adds the corresponding table entry of the terminal B in the sub-table 3, and then sends an address reply message to the terminal B.
Table 2 shows the newly added entries in the gateway station terminal location table for terminal a and terminal B.
TABLE 2
Second, when the access satellite of the terminal changes, the access satellite updating process
Referring to fig. 1 and 3, the access satellite of the terminal B is switched from the satellite S3 to the satellite S4 at time t2, and the access satellite updating process is that the terminal B or the current access satellite S4 sends a position notification message to the gateway station, where the message includes a terminal address 10.3.1.1 and a current access satellite identifier S4; the gateway station knows the terminal B initial access satellite identifier S3 through the terminal address 10.3.1.1, and uses it as an index, finds the sub-table 3 corresponding to the initial access satellite S3 in the terminal position table, searches the table entry corresponding to the terminal B in the sub-table, and changes the current access satellite identifier from S3 to S4.
Table 3 gives the entries updated by terminal B in the gateway station terminal location table.
TABLE 3
Inquiry process of one terminal or its current access satellite to another terminal current access satellite
Referring to fig. 1 and 4, when a terminal a desires a terminal B to communicate, the terminal a needs to acquire a current access satellite identifier of the terminal B.
Before t2, the terminal a or its current access satellite S1 sends a location query message to the gateway station, where the message includes a terminal B address 10.3.1.1, the gateway station learns the terminal B initial access satellite identifier S3 through the terminal address 10.3.1.1, and uses it as an index to find the sub-table 3 corresponding to its initial access satellite S3 in the terminal location table, and searches the entry corresponding to the terminal B in the sub-table to find the terminal B current access satellite S3.
After time t2, the terminal a or its current access satellite S1 sends a location query message to the gateway station, where the message includes a terminal B address 10.3.1.1, the gateway station learns the terminal B initial access satellite identifier S3 through the terminal address 10.3.1.1, and uses it as an index to find the sub-table 3 corresponding to its initial access satellite S3 in the terminal location table, and searches the entry corresponding to the terminal B in the sub-table to find the terminal B current access satellite S4.
If the complexity is put at the terminal, the terminal and the gateway station interact with the position management related message; if the complexity is put in the satellite, the position management related message is interacted between the satellite and the gateway station. Fig. 3 and 4 are schematic diagrams of complexity placed at a terminal.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art and related arts based on the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention.
Claims (6)
1. A terminal position management method for satellite communication network is characterized in that a gateway station maintains a terminal position table, the terminal position table comprises a plurality of sub-tables, each sub-table corresponds to a satellite in the satellite communication network and comprises terminal information of all satellites which are initially accessed into the satellite; each satellite and each terminal have unique identification;
for a terminal newly added into a satellite communication network, a gateway station takes an initial access satellite identifier of the terminal as an index, finds a corresponding sub-table of the satellite in a terminal position table, allocates an address associated with the initial access satellite identifier for the terminal, and adds a table entry corresponding to the terminal in the sub-table, wherein the table entry at least comprises the address allocated by the gateway station for the terminal, the terminal identifier and a current access satellite identifier; the address associated with the initial access satellite identifier acquired by the terminal remains unchanged after the terminal accesses the satellite communication network.
2. The terminal position management method for a satellite communication network according to claim 1, wherein the gateway station recovers an address assigned to the terminal when the terminal leaves the satellite communication network.
3. The terminal position management method for the satellite communication network according to any one of claims 1 or 2, wherein the address initial assignment process when the terminal joins the satellite communication network includes the steps of:
step A1, when a terminal newly joins in a satellite communication network, sending an address application message to a gateway station, wherein the message comprises a terminal identifier and an initial access satellite identifier;
step A2, the gateway station extracts the initial access satellite identification in the address application message, uses the initial access satellite identification as the index, finds the sub-table corresponding to the satellite in the terminal position table, allocates an address associated with the initial access satellite identification for the terminal, and adds a table entry corresponding to the terminal in the sub-table;
step A3, the gateway station sends an address reply message to the terminal or the access satellite thereof, wherein the message contains the terminal identification and the terminal address.
4. The terminal position management method for the satellite communication network according to claim 1 or 2, wherein when the access satellite of the terminal is changed, the access satellite update procedure thereof comprises the steps of:
step B1, the terminal or the current access satellite sends a position notification message to the gateway station, the message contains the terminal address and the current access satellite identification;
step B2, the gateway station acquires the terminal initial access satellite identification through the terminal address, and uses it as index, finds the sub-table corresponding to the initial access satellite in the terminal position table, looks up the table entry corresponding to the terminal in the sub-table, and updates the current access satellite identification.
5. The terminal position management method for a satellite communication network according to claim 1 or 2, wherein the inquiry procedure of one terminal or its current access satellite to the current access satellite of another terminal comprises the steps of:
step C1, the inquiry terminal or the current access satellite thereof sends a position inquiry message to the gateway station, the message contains the address of the inquired terminal;
step C2, the gateway station acquires the initial access satellite identification of the inquired terminal through the inquired terminal address, and uses it as index, finds the sub-table corresponding to the initial access satellite in the terminal position table, searches the table item corresponding to the inquired terminal in the sub-table, and inquires the current access satellite identification;
and step C3, the gateway station sends a position reply message to the inquiry terminal or the access satellite thereof, wherein the message contains the address of the inquired terminal and the identification of the current access satellite of the inquired terminal.
6. A satellite communication network using the terminal position management method of any one of claims 1 to 5.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113259499A (en) * | 2021-03-31 | 2021-08-13 | 航天东方红卫星有限公司 | Addressing method for cross-domain network |
| CN113824640A (en) * | 2021-09-06 | 2021-12-21 | 天地信息网络研究院(安徽)有限公司 | Satellite network label switching method for satellite with complexity |
| CN113824639A (en) * | 2021-09-06 | 2021-12-21 | 天地信息网络研究院(安徽)有限公司 | Satellite network label switching method of complexity at terminal |
| CN115665094A (en) * | 2022-12-28 | 2023-01-31 | 鹏城实验室 | IP addressing method and device for world communication, intelligent terminal and storage medium |
| CN116527585A (en) * | 2023-07-05 | 2023-08-01 | 天地信息网络研究院(安徽)有限公司 | Congestion control method for stream length perception |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113259499A (en) * | 2021-03-31 | 2021-08-13 | 航天东方红卫星有限公司 | Addressing method for cross-domain network |
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| CN113824640A (en) * | 2021-09-06 | 2021-12-21 | 天地信息网络研究院(安徽)有限公司 | Satellite network label switching method for satellite with complexity |
| CN113824639A (en) * | 2021-09-06 | 2021-12-21 | 天地信息网络研究院(安徽)有限公司 | Satellite network label switching method of complexity at terminal |
| CN113824639B (en) * | 2021-09-06 | 2023-02-28 | 天地信息网络研究院(安徽)有限公司 | Satellite network label switching method of complexity at terminal |
| CN115665094A (en) * | 2022-12-28 | 2023-01-31 | 鹏城实验室 | IP addressing method and device for world communication, intelligent terminal and storage medium |
| CN115665094B (en) * | 2022-12-28 | 2023-04-25 | 鹏城实验室 | IP addressing method and device for world communication, intelligent terminal and storage medium |
| CN116527585A (en) * | 2023-07-05 | 2023-08-01 | 天地信息网络研究院(安徽)有限公司 | Congestion control method for stream length perception |
| CN116527585B (en) * | 2023-07-05 | 2023-08-29 | 天地信息网络研究院(安徽)有限公司 | Congestion control method for stream length perception |
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