CN117377064A - Grouping paging method for terminal in low-orbit satellite Internet of things scene - Google Patents
Grouping paging method for terminal in low-orbit satellite Internet of things scene Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
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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
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- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
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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
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the technical field of low-orbit satellite wireless communication, and particularly relates to a grouping paging method of a terminal in a low-orbit satellite Internet of things scene, which comprises the following steps: firstly, grouping terminals once based on geographic position and position area division of the terminals, then taking minimum energy consumption as an optimization target, introducing a target optimization algorithm to optimize characteristic thresholds of the terminals of the Internet of things, determining proper sub-groups, and finally determining that a paging satellite pages the sub-groups sequentially according to priority order. The invention effectively reduces the energy consumption of the terminal of the Internet of things, prolongs the service life of the battery, effectively reduces the probability of message congestion and collision in the paging process, reduces the paging delay and improves the paging success rate.
Description
Technical Field
The invention belongs to the technical field of low-orbit satellite wireless communication, and particularly relates to a grouping paging method of a terminal in a low-orbit satellite Internet of things scene.
Background
When the application of the internet of things technology has become a middle stream column in various fields, satellite networks have the unique advantage of wide area coverage as part of them. Coverage of a single satellite can often reach hundreds of thousands to millions of square kilometers, making it an ideal choice for large-scale users to provide efficient network services. However, in the satellite internet of things system, when the number of users is huge, the conventional management mechanism based on single user may cause the problem of congestion of the satellite-to-ground link, which threatens the reliability and efficiency of communication.
Consider, for example, a satellite internet of things system having hundreds of terminal devices, each of which needs to communicate with a ground station. Conventional communication approaches may lead to a series of problems including link congestion, frequent paging requests, and ineffective communication attempts. This may jeopardize the performance of the overall system because of wasted resources and inefficiency in communication. To cope with this challenge, 3GPP introduced a group management mechanism that divides terminal devices into a plurality of groups and manages them by group. The mechanism effectively reduces the problem of link congestion, reduces the load of paging requests, and improves the communication efficiency and the resource utilization rate. This helps the satellite internet of things system to efficiently handle large-scale numbers of users while providing reliable communication services.
However, although group management mechanisms are very useful in solving congestion problems, conventional grouping approaches still have problems. The traditional grouping mode generally consumes a large amount of energy, reduces the efficiency of information transmission, and does not conform to the low power consumption characteristic of the Internet of things equipment. The traditional grouping mode and communication protocol generally adopt a mode with high bandwidth and high energy consumption, and are suitable for the traditional Internet, but have obvious defects in large-scale Internet of things deployment.
Disclosure of Invention
In order to solve the technical problems, the invention provides a grouping paging method of a terminal in a low-orbit satellite Internet of things scene, which comprises the following steps:
s1, constructing a communication scene of a low-orbit satellite and a mass ground Internet of things terminal;
s2, dividing a static position area based on coverage of a ground station;
s3, grouping once based on the static position area and the geographic position of the terminal, and selecting one terminal as a representative terminal;
s4, on the basis of primary grouping, continuously optimizing a delay tolerance threshold and a data transmission frequency threshold by using a genetic algorithm with the minimum paging energy consumption of a terminal group as an optimization target, and dividing terminals in one group into four subgroups of high-frequency delay tolerance, high-frequency non-delay tolerance, low-frequency delay tolerance and low-frequency non-delay tolerance according to the optimization threshold to finish secondary grouping;
s5, the ground station receives the group paging message, determines a paging group, and then determines a paging satellite through the geographic position of the representative terminal in the group and the connected satellite;
s6, the paging satellite performs priority ordering on the subgroups obtained by the secondary grouping according to the time delay tolerance and the data transmission frequency requirement, and the satellite sequentially performs grouping paging according to the sequence;
s7, the terminal receives the paging message, processes the paging message, sends a confirmation message to the calling user, establishes a communication link and completes the paging.
The invention has the beneficial effects that:
according to the method, under the satellite Internet of things scene, namely the scene that the problems of network congestion, communication delay and the like are possibly caused when a large number of Internet of things terminals page at the same time, a genetic algorithm is adopted, the minimum paging energy consumption is taken as a main optimization target, and the parameter threshold is optimized; compared with the traditional grouping scheme, the method not only effectively reduces the energy consumption of the terminal equipment and prolongs the service life of the terminal equipment, but also provides a more convenient terminal management means for the ground station, thereby having important significance for the sustainability of the satellite Internet of things and the efficient management of the terminal equipment;
the paging satellite in the invention pages the packets in sequence according to the priority order, thereby effectively reducing the probability of message congestion and collision caused by simultaneous paging.
Drawings
Fig. 1 is a flowchart of a method for paging a terminal in a low-orbit satellite internet of things scenario according to the present invention;
FIG. 2 is a schematic diagram of a static location area division of a satellite terminal according to the present invention;
FIG. 3 is a schematic diagram of a secondary grouping of the present invention;
FIG. 4 is a flow chart of terminal secondary grouping for optimizing a threshold with minimum energy consumption as a target in the present invention;
fig. 5 is a schematic diagram of the arc distance between a satellite and a terminal 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.
A grouping paging method of a terminal in a low orbit satellite Internet of things scene is shown in fig. 1, and comprises the following steps:
s1, constructing a communication scene of a low-orbit satellite and a mass ground Internet of things terminal;
s2, dividing a static position area based on coverage of a ground station;
s3, grouping once based on the static position area and the geographic position of the terminal, and selecting one terminal as a representative terminal;
s4, on the basis of primary grouping, continuously optimizing a delay tolerance threshold and a data transmission frequency threshold by using a genetic algorithm with the minimum paging energy consumption of a terminal group as an optimization target, and dividing terminals in one group into four subgroups of high-frequency delay tolerance, high-frequency non-delay tolerance, low-frequency delay tolerance and low-frequency non-delay tolerance according to the optimization threshold to finish secondary grouping;
s5, the ground station receives the group paging message, determines a paging group, and then determines a paging satellite through the geographic position of the representative terminal in the group and the connected satellite;
s6, the paging satellite performs priority ordering on the subgroups obtained by the secondary grouping according to the time delay tolerance and the data transmission frequency requirement, and the satellite sequentially performs grouping paging according to the sequence;
s7, the terminal receives the paging message, processes the paging message, sends a confirmation message to the calling user, establishes a communication link and completes the paging.
In this embodiment, a communication scenario of K low-orbit satellites and N ground internet of things terminals is constructed:
k low-orbit satellites in the communication scene are connected with the same ground station, and N terminals of the Internet of things are distributed in the service range of the ground station. Every time the terminal is started, its own information and various characteristic parameters are transmitted to ground station by means of proper satellite, i.e. the terminal in the beam coverage area of the satellite can use said satellite as reporting satellite, and these parameters include current geographic position (longitude and latitude coordinates) of the terminal, and are recorded as l i The method comprises the steps of carrying out a first treatment on the surface of the Delay tolerance setting, denoted as d i The method comprises the steps of carrying out a first treatment on the surface of the The data transmission frequency, denoted f i (1≤i≤N)。
In this embodiment, the static location area is divided based on the ground station coverage:
because the terminal has low mobility in the satellite Internet of things scene, static position area division is adopted, and compared with a dynamic position area, the overhead of position area updating can be greatly reduced. The static location area design is shown in fig. 2, firstly, the coverage area of the ground station is divided into 6 square areas according to longitude and latitude, the number of the areas can be adjusted according to the coverage area of the ground station, and the ping-pong effect can be eliminated by adopting a round location area design (the round area is the circumscribing circle of the square area) on the basis of the square area because the ping-pong effect can be generated by adopting a square area terminal;
handle 6 static positionsThe zone is denoted as LA 1 、LA 2 、LA 3 、LA 4 、LA 5 、LA 6 And saved to the ground station.
In this embodiment, grouping is performed once based on the static location area and the geographical location of the terminal and one terminal is randomly selected as the representative terminal:
the ground station divides the terminals in the same position area into a group according to the geographic position reported by the terminals, and G= (G) 1 ,G 2 ,…,G 6 ). As shown in fig. 2, both terminals a and B are in LA 1 In the area, the ground station is based on the geographical position l of the two terminals A 、l B Knowing that they are all located at LA 1 In the area, therefore, the a-terminal and the B-terminal are brought into group G 1 And selects the B terminal as the representative terminal of the group.
On a one-time grouping basis, the paging energy consumption of the terminal group is minimized as an optimization target E Gi Continuously optimizing delay tolerance threshold d by using genetic algorithm th And a data transmission frequency threshold f th Terminals in one group are again divided into 4 subgroups of high frequency delay tolerance, high frequency non-delay tolerance, low frequency delay tolerance and low frequency non-delay tolerance based on the optimized threshold, as shown in fig. 4, to complete the secondary grouping.
In the present embodiment, G is 1 For example, first, a delay tolerance threshold d is randomly generated th And a data transmission frequency threshold f th The threshold is generated within an acceptable range of values for delay tolerance and data transmission frequency of the terminal. Group G after first grouping terminals 1 The terminal in the network tolerates d according to own time delay i And data transmission frequency f i And the current delay tolerance threshold d th And a data transmission frequency threshold f th By comparison, the selection of the appropriate subgroup for addition, the specific grouping can be expressed as follows:
high frequency delay tolerant DT: f (f) i ＞f th ,d i ＞d th ；
High frequency non-delay tolerant IT: f (f) i ＞f th ,d i ＜d th ；
Low frequency delay tolerant DF: f (f) i ＜f th ,d i ＞d th ；
Low frequency non-delay tolerant IF: f (f) i ＜f th ,d i ＜d th ；
The energy consumption of the terminals grouped into each subgroup according to the threshold is then calculated and added to obtain the total paging energy consumption for the grouping situation. Group paging energy consumption E G1 The calculation is as follows:
wherein E is G1 Represented as G 1 Group paging energy consumption in the case of grouping,representing the sum of paging energy consumption of each terminal in the m subgroup:
wherein,the paging energy consumption of the ith terminal in the subgroup is represented by W, the power of the terminal is represented by T, the average working time of the terminal is represented by d i Representing the delay tolerance value of the terminal itself.
Then delay tolerance threshold d th And a data transmission frequency threshold f th And performing crossover and mutation operation in the genetic algorithm to change the value, and comparing the terminal with the current threshold value again according to the self delay tolerance and the data transmission frequency characteristic to finish grouping. The terminal energy consumption of each subgroup is calculated again and added to obtain the current subgroupNew group paging energy consumption under conditions
Then, it is determined whether newEnergy consumption E smaller than last updated threshold G1 If the current grouping result is saved and the group paging energy consumption is saved as the new group paging energy consumption +.>Otherwise, the last saved grouping result and the group paging energy consumption are maintained.
Then entering the next iteration, if the stored group paging energy consumption is not reduced or kept unchanged continuously for three times in the iteration process, indicating that the algorithm has reached a stable state, terminating the iteration, directly outputting a grouping result, and completing secondary grouping and grouping results
As shown in fig. 3, different shapes are used to identify the case of terminals of different subgroups within a group, and then group identification GID allocation is performed for 4 subgroups.
The group identifier is totally two bits, wherein one bit represents the time delay characteristic, the other bit represents the data transmission frequency characteristic, 1 represents the time delay tolerant and high-frequency transmission, 0 represents the time delay intolerable and low-frequency transmission, and therefore, the 4 groups are identified as high-frequency delay tolerant DT-11, high-frequency non-delay tolerant IT-01, low-frequency delay tolerant DF-10 and low-frequency non-delay tolerant IF-00.
The ground station receives the group paging message and determines the paging group G i Then representing the geographical location of the terminal by means of the group 0 And connected satellite S i Determining paging satellites, S i (1.ltoreq.i.ltoreq.K) represents the ith satellite to which the ground station is connected:
the ground station receives the paging message of the group, processes the paging message and obtains the identification information of the paging groupThe request type, possible parameters or other relevant data, and then the paging group G is confirmed by the identification information of the paging group 1 And obtains the geographical position l of the paging group representative terminal B B (la_B, lo_B) and satellite S i Position (la_S) i ，lo_S i ) The longitude and latitude of the satellite position are the same as the longitude and latitude of the satellite point.
Then, according to the position of the representative terminal and the position of each satellite, calculating the arc distance between the satellite lower point and the representative terminal and the included angles between the terminal and the satellite and different positions, as shown in fig. 5:
where λ represents the angle between the terminal and the equatorial plane, lo_b represents the longitude position of terminal B on earth, and ε is represented as satellite S i Is the angle between the satellite and the equatorial plane, eta represents the angle between the terminal and the satellite at the equatorial plane, lo_S i Representing satellite S i Is a longitude position of the subsurface point on earth.
The arc distance between the current terminal and the satellite can then be derived:
cosα＝sinεsinλ+cosλcosεcosη
L i ＝R×arccoscosα
where α is expressed as azimuth angle between satellite and terminal, L i Represented as terminal and satellite S i The arc distance between them, R represents the radius of the earth.
Finally obtaining an arc distance set between all satellites and the representative terminal, and obtaining L through comparison 3 Is the smallest arcLine distance, thus determining satellite S 3 Is a paging satellite.
Paging satellite S 3 The priority ordering is carried out according to the secondary grouping required by the delay tolerance and the transmission frequency, and the satellite carries out grouping paging in sequence:
first, paging satellite S 3 Sorting the stored subgroups according to the time delay tolerance and transmission frequency requirements, specifically as follows:
the priority of the time delay requirement is higher than the priority of the data transmission frequency in the terminal equipment of the Internet of things, so that the time delay requirement is prioritized when sequencing, and the subgroup with higher time delay requirement has higher paging priority; if the time delay requirements of the subgroups are the same, the ground station will compare according to the data transmission frequency, i.e. terminals with high transmission frequency will have higher paging priority than terminals with low transmission frequency; the four subgroups are thus ordered as: high frequency non-delay tolerant, low frequency non-delay tolerant, high frequency delay tolerant and low frequency delay tolerant;
next, paging satellite S 3 And broadcasting paging messages to the terminals in the coverage area of the beam according to the priority order, wherein the broadcast messages carry the subgroup identification GID.
The terminal receives the paging message, processes the paging message, sends a confirmation message to the calling party, establishes a communication link and finishes paging:
the terminal receives the paging message in satellite broadcasting, the terminal processes the paging message, firstly analyzes the paging message to obtain related messages such as a group identification GID, a message type, a calling system and the like, then verifies that the group identification GID carried in the paging message is the same as the terminal itself, and if the group identification GID is the same, then sends a confirmation message to the ground station for informing the ground station of receiving the paging request from the calling system and sending the message to the calling system, and indicates that the paging request is received, so that a communication link can be established.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The grouping paging method of the terminal in the low orbit satellite Internet of things scene is characterized by comprising the following steps:
s1, constructing a communication scene of a low-orbit satellite and a mass ground Internet of things terminal;
s2, dividing a static position area based on coverage of a ground station;
s3, grouping once based on the static position area and the geographic position of the terminal, and selecting one terminal as a representative terminal;
s4, on the basis of primary grouping, continuously optimizing a delay tolerance threshold and a data transmission frequency threshold by using a genetic algorithm with the minimum paging energy consumption of a terminal group as an optimization target, and dividing terminals in one group into four subgroups of high-frequency delay tolerance, high-frequency non-delay tolerance, low-frequency delay tolerance and low-frequency non-delay tolerance according to the optimization threshold to finish secondary grouping;
s5, the ground station receives the group paging message, determines a paging group, and then determines a paging satellite through the geographic position of the representative terminal in the group and the connected satellite;
s6, the paging satellite performs priority ordering on the subgroups obtained by the secondary grouping according to the time delay tolerance and the data transmission frequency requirement, and the satellite sequentially performs grouping paging according to the sequence;
s7, the terminal receives the paging message, processes the paging message, sends a confirmation message to the calling user, establishes a communication link and completes the paging.
2. The method for grouping and paging the terminals in the low-orbit satellite internet of things scene according to claim 1, wherein the constructing the communication scene of the low-orbit satellite and mass ground internet of things terminal comprises the following steps:
k low-orbit satellites in a communication scene are connected with the same ground station, N terminals of the Internet of things are distributed in the service range of the ground station, and when the terminal is started, the terminal can transmit information of the terminal and various characteristic parameters to the ground station through the appropriate satellites.
3. The method for grouping and paging terminals in a low-orbit satellite internet of things scenario according to claim 1, wherein the dividing the static location area based on the coverage area of the ground station comprises:
dividing the coverage area of a ground station into K square areas according to longitude and latitude, using square position areas, and switching a terminal back and forth between two base stations if the signal intensity of the two base stations is changed drastically in a certain area, so that a ping-pong effect is generated; in order to eliminate the ping-pong effect, an external circular position area design is adopted on the basis of a square position area to eliminate the ping-pong effect, and the square position area is counted as LA i (1. Ltoreq.i.ltoreq.K), wherein LA i Represents the i-th static location area, and K represents the number of static location areas.
4. The method for grouping and paging terminals in a low-orbit satellite internet of things scenario according to claim 1, wherein grouping is performed once based on a static location area and a geographical location of the terminal and selecting one terminal as a representative terminal comprises:
the ground station divides the terminals in the same position area into a group according to the geographic position reported by the terminals, and the first grouping is completed and is recorded as G= (G) 1 ,G 2 …G K ) Wherein K represents the number of static location areas; and randomly selecting a terminal within each group as a representative terminal of the group
5. The method for grouping and paging terminals in a low-orbit satellite internet of things scenario according to claim 1, wherein, on the basis of one grouping, with minimum paging energy consumption of a terminal group as an optimization target, continuously optimizing a delay tolerance threshold and a data transmission frequency threshold by using a genetic algorithm, and dividing terminals in one group into four subgroups of high-frequency delay tolerance, high-frequency non-delay tolerance, low-frequency delay tolerance and low-frequency non-delay tolerance again based on the optimization threshold, completing secondary grouping, comprising:
first, the ground station randomly generates a delay tolerance threshold d within the acceptable range of the delay tolerance and data transmission frequency of the terminal th And a data transmission frequency threshold f th The terminal tolerates d according to own time delay i And data transmission frequency f i And the generated delay tolerance threshold d th And a data transmission frequency threshold f th Comparing, and selecting a proper subgroup to add; after the first iterative grouping is completed, the grouping result is saved, the terminal energy consumption of each subgroup is calculated and added to obtain the group paging energy consumption E under the current grouping condition Gi ；
Then delay tolerance threshold d th And a data transmission frequency threshold f th The terminal is updated by adopting crossover and mutation operations in a genetic algorithm, and the terminal tolerates d according to own time delay again i And data transmission frequency f i Comparing with the current updated threshold value, selecting a proper subgroup to add, and finishing grouping; the terminal energy consumption of each subgroup is calculated again and added to obtain the new group paging energy consumption under the current grouping condition
Determining whether new group paging energy consumptionGroup paging energy consumption E smaller than last iteration Gi If yes, the current grouping result and the group paging energy consumption are saved>Otherwise, maintaining last stored grouping result and group paging energy consumption E Gi Is a value of (2); then entering the next iteration, if the stored group paging energy consumption is not reduced or kept unchanged continuously for three times in the iteration process, terminating the iteration, directly outputting a grouping result, completing the secondary grouping, and marking as ++>Wherein (1)>High-frequency delay-tolerant subset terminal set in the case of the ith location area packet,/->Representing a set of high frequency non-delay tolerant subgroup terminals in case of the ith position zone group,/or->Representing a set of low frequency non-delay tolerant subgroup terminals in case of the ith position zone group,/or->Representing a set of low frequency delay tolerant subgroup terminals in the case of the ith location area packet.
6. The method for paging a terminal in a low-orbit satellite internet of things scenario according to claim 5, wherein G after the first grouping i The terminal in (2) selects a proper subgroup according to the self delay tolerance and transmission frequency characteristics and compared with a threshold value, and the method comprises the following steps:
high frequency delay tolerant DT: f (f) i ＞f th ,d i ＞d th ；
High frequency non-delay tolerant IT: f (f) i ＞f th ,d i ＜d th ；
Low frequency delay tolerant DF: f (f) i ＜f th ,d i ＞d th ；
Low frequency non-delay tolerant IF: f (f) i ＜f th ,d i ＜d th ；
Wherein f i Representing the frequency of data transmission by the terminal itself，f th Represents a data transmission frequency threshold, d i Representing the delay tolerance value of the terminal, d th Representing a delay tolerance threshold.
7. The method for grouping and paging terminals in the Internet of things scenario of low-orbit satellite according to claim 5, wherein the terminal energy consumption of each subgroup is calculated and added to obtain the grouping situation group paging energy consumption E Gi Comprising:
paging energy consumption of subgroup:
group paging energy consumption:
wherein E is Gi Indicating the group paging power consumption of all groups,representing the sum of paging energy consumption of all terminals in the m subgroup +.>Indicating paging energy consumption of the ith terminal in the subgroup,/->W represents the power of the terminal, T represents the average working time of the terminal, and d i Representing the delay tolerance value of the terminal itself.
8. The method for packet paging of a terminal in a low-orbit satellite internet of things scenario according to claim 1, wherein the ground station receives the group paging message, determines a paging group, and then determines a paging satellite by representing a geographic location of the terminal and a connected satellite in the group, comprising:
the ground station receives the paging message, decodes the paging message to obtain the paging group identification information, confirms the paging group via the paging group identification information, and searches the ground station for the geographic position l of the terminal represented by the paging group 0 (la_l, lo_l) and satellite S i Position (la_S) i ，lo_S i ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein la_l and lo_l represent longitude and latitude, respectively, of the terminal on earth, la_S i 、lo_S i Respectively representing the longitude and latitude of the satellite's understar point on earth;
calculating the arc distance L between the satellite lower point and the representative terminal according to the position of the representative terminal and the satellite position i R×arcccos α, taking the satellite closest to it as the paging satellite; where R represents the radius of the earth and α represents the azimuth of the satellite and the representative terminal in geographic location.
9. The method for grouping and paging terminals in the scene of the internet of things by using the low orbit satellite according to claim 1, wherein the paging satellite prioritizes subgroups obtained by the secondary grouping according to delay tolerance and data transmission frequency requirements, and the satellite performs grouping and paging in sequence according to the order, and the method comprises the following steps:
when sorting, the time delay requirement should be prioritized, and the subgroup with higher time delay requirement has higher paging priority; if the time delay requirements of the subgroups are the same, the terminal with high transmission frequency has higher paging priority than the terminal with low transmission frequency;
paging satellite pages in order according to priority order, and broadcasts subgroup group identification GID and calling system information in the coverage area of paging satellite.
10. The method for paging a terminal in a low-orbit satellite internet of things scenario according to claim 1, wherein the terminal receives the paging message, processes the paging message, sends an acknowledgement message to the calling subscriber and establishes a communication link, and the paging is completed, comprising:
the terminal receives the paging message in satellite broadcasting, analyzes the paging message to obtain the group identification GID and the calling system information, verifies whether the group identification GID carried in the paging message is the same as the identification information of the terminal itself, if so, sends a confirmation message to the ground station for informing the ground station of receiving the paging request from the calling system and sending the message to the calling system, and indicates that the paging request is received, so that a communication link can be established.
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