CN112887015A - Satellite terminal beam selection method based on position information and motion trend - Google Patents

Satellite terminal beam selection method based on position information and motion trend Download PDF

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CN112887015A
CN112887015A CN202110391068.7A CN202110391068A CN112887015A CN 112887015 A CN112887015 A CN 112887015A CN 202110391068 A CN202110391068 A CN 202110391068A CN 112887015 A CN112887015 A CN 112887015A
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satellite terminal
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distance
ground satellite
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CN112887015B (en
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何元智
鲍峰
刘韵
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Institute of Network Engineering Institute of Systems Engineering Academy of Military Sciences
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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
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • 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 discloses a satellite terminal beam selection method based on position information and motion trend, which comprises the following steps: firstly, the satellite terminal receives longitude and latitude information of the central point of each wave beam from broadcast information, and calculates the distance between the satellite terminal and the central point of each wave beam by combining the position of the satellite terminal; then, selecting the beam with the minimum distance, and judging whether other beams with similar distances exist; if the selected wave beam exists, selecting the wave beam with the smallest included angle with the motion direction of the satellite terminal from the wave beams meeting the conditions as a selected wave beam; if not, designating the beam with the minimum distance as the selected beam; and finally, the satellite terminal initiates a normal position updating process. The method can overcome the problems that the intensity change from the center of the satellite beam to the edge of the satellite beam is small and the beam selection is difficult to be carried out according to the channel quality; the ping-pong effect can be relieved, the times of satellite terminal beam reselection and position updating are reduced, the power consumption is reduced, and the working time is prolonged.

Description

Satellite terminal beam selection method based on position information and motion trend
Technical Field
The invention relates to the technical field of satellite mobile communication, in particular to a satellite terminal beam selection method based on position information and motion trend.
Background
The satellite mobile communication system is used as an extension and supplement of the ground cellular mobile communication, is mostly used for the communication and emergency communication in remote areas, and better solves the problem that the coverage capability of the ground cellular mobile communication system is limited in the remote areas and in sea areas. In the multi-beam satellite mobile communication system, the gateway station stores the paging area information of each satellite terminal, and when the satellite terminal is paged, the gateway station pages the satellite terminal in the paging area where the satellite terminal is located, so that the satellite terminal needs to inform the gateway station of the paging area where the satellite terminal is located in time in the moving process. For a satellite terminal moving at a high speed, when the satellite terminal is located in an overlapping area of coverage areas of a plurality of wave beams and moves back and forth among the wave beams, the satellite terminal repeatedly performs wave beam reselection and position updating processes, so that a ping-pong effect is caused, the ping-pong effect not only wastes limited system resources of a satellite communication system, but also causes overlarge power consumption of the satellite terminal, and even influences the normal communication service of the satellite terminal. Therefore, it is necessary to provide a satellite terminal beam selection method suitable for multi-beam satellite mobile communication, which ensures the reliability of network paging and effectively avoids the ping-pong effect.
Chinese patent CN111371486A proposes a method, system, device and storage medium for beam switching based on low earth orbit satellite, which selects the beam with the strongest signal quality to switch by judging the quality of the beam signal. Chinese patent CN107852227B proposes a satellite communication location reporting and paging method based on distance threshold control, which determines whether to trigger a location report by judging whether the difference between the current location and the expected location of a user terminal exceeds a distance threshold, and this patent uses a fixed distance threshold, and does not consider the influence of the moving direction on the terminal residence time in the beam.
Disclosure of Invention
The invention discloses a satellite terminal beam selection method based on position information and motion trend, aiming at the beam selection problem of a high-speed motion satellite terminal in a satellite mobile communication system, which comprises the following specific steps:
s1, the multi-beam satellite mobile communication system broadcasts the longitude and latitude information of the central point position of each beam to the ground satellite terminal through the broadcast message;
s2, the ground satellite terminal continuously receives the broadcast message from the multi-beam satellite mobile communication system in the standby state, and obtains the self position information through the self positioning function, wherein the self position information comprises the self longitude and latitude information;
s3, the ground satellite terminal calculates the distance between the position and the central point of each wave beam capable of covering the position;
assuming that the ground satellite terminal is covered by N wave beams at the same time, the position of the ground satellite terminal and the ith wave beam BiDistance L between center pointsiExpressed as:
Figure BDA0003016780500000021
wherein, i is 1,2, …, N, R is the earth radius, alphau、
Figure BDA0003016780500000022
Respectively satellite terminal and beam BiLongitudinal coordinate of center point, betau、
Figure BDA0003016780500000023
Respectively satellite terminal and beam BiLatitude coordinates of the center point;
s4, the ground satellite terminal selects the minimum value in the plurality of distances calculated in the step S3, namely the beam corresponding to the minimum distance, judges whether other beams have the beams with the distance close to the distance of the ground satellite terminal and the minimum distance, if yes, all the beams meeting the condition and the beam corresponding to the minimum distance are selected, and the step S5 is executed, otherwise, the beam corresponding to the minimum distance is designated as the selected beam, and the step S7 is executed;
in step S4, the ground satellite terminal selects the beam B having the smallest distance from the beam center point from the N beamskI.e. by
Figure BDA0003016780500000031
1≤k≤N,k∈N+K is the beam number of the beam corresponding to the minimum distance, LkFor the position of the ground satellite terminal and the kth wave beam BkRecording distance threshold value as delta L, determining its value according to diameter of beam coverage of satellite mobile communication system, and judging whether there is other beam Bj，1≤j≤N,j≠k,j∈N+Satisfy Lj≤(Lk+ Δ L), j is the beam number of the beam satisfying this condition, LjFor the position of the ground satellite terminal and the jth wave beam BjThe distance between the center points; if present, all beams satisfying this condition and beam BkStoring the set omega, executing the step S5, otherwise, storing the beam BkDesignated as the selected beam, step S7 is performed;
s5, the ground satellite terminal obtains self movement velocity vectors from the angular accelerometer and the accelerometer which are arranged on the ground satellite terminal, and calculates the included angle between the connection line of the ground satellite terminal and the central point of each wave beam and the movement velocity vectors of the satellite terminal;
assuming that there are M beams in the set Ω, for the M-th beam bm，bmE Ω, M1, 2, …, M, terrestrial satellite terminal and beam bmThe calculation formula of the included angle between the central point connecting line and the motion velocity vector of the satellite terminal is as follows:
Figure BDA0003016780500000032
wherein the content of the first and second substances,
Figure BDA0003016780500000033
and
Figure BDA0003016780500000034
are respectively the wave beam bmLongitude and latitude coordinates of the center point, θuThe included angle between the velocity vector of the ground satellite terminal and the north is formed;
s6, the ground satellite terminal selects the beam corresponding to the minimum included angle, namely the minimum included angle, among all the included angles calculated in the step S5, and designates the beam as the selected beam;
in step S6, the ground satellite terminal selects the beam b corresponding to the minimum included angle calculated in step S5 from the set ΩcI.e. by
Figure BDA0003016780500000035
1≤c≤M,c∈N+C is the beam number of the beam corresponding to the minimum included angle, and the beam bcDesignating as a selected beam;
and S7, the ground satellite terminal resides in the selected beam and updates the position of the ground satellite terminal.
In the method of the present invention, the multi-beam satellite mobile communication system uses a spot beam as a paging area, and when a ground satellite terminal is paged, a gateway station pages the ground satellite terminal in the paging area where the satellite terminal is located. In the moving process of the satellite terminal, if the located beam changes, the position information of the satellite terminal is updated, the information of the resident beam of the satellite terminal is informed to the gateway station, and when the satellite terminal is covered by a plurality of satellite beams at the same time, one beam is preferentially selected as the resident beam of the satellite terminal.
The invention has the beneficial effects that: the method of the invention resides on the spot beam with the nearest distance by comparing the distance between the satellite terminal and the beam center point of the peripheral spot beam, thereby overcoming the problems that the intensity change from the satellite beam center point to the edge signal is small and the beam selection is difficult to be carried out by the channel quality measurement technology; the method of the invention combines the movement trend of the satellite terminal to select the wave beam, selects the wave beam with the longest residence time, can reduce the times of wave beam reselection and position update of the satellite terminal, relieves the ping-pong effect of the satellite terminal in the wave beam edge area, reduces the power consumption of the satellite terminal and prolongs the working time of the satellite terminal.
Drawings
FIG. 1 is a flow chart of an implementation of the method of the present invention.
Fig. 2 is a schematic diagram of the distance between the satellite terminal and the beam center point according to the present invention.
Fig. 3 is a schematic diagram of the relationship between the movement trend of the satellite terminal and the connection line between the satellite terminal and the beam center point.
Detailed Description
For a better understanding of the present disclosure, an example is given here.
The present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of an implementation of the method of the present invention. In the method of the present invention, the multi-beam satellite mobile communication system uses a spot beam as a paging area, and when a ground satellite terminal is paged, a gateway station pages the ground satellite terminal in the paging area where the satellite terminal is located. In the moving process of the satellite terminal, if the located beam changes, the position information of the satellite terminal is updated, the information of the resident beam of the satellite terminal is informed to the gateway station, and when the satellite terminal is covered by a plurality of satellite beams at the same time, one beam is preferentially selected as the resident beam of the satellite terminal.
Example 1:
assuming that the satellite terminal is covered by 3 beams at the same time, as shown in fig. 2, the beam center points of the 3 beams are respectively denoted as beam center point 1, beam center point 2, beam center point 3, and L1、L2And L3The distances between the satellite terminal and the beam center point 1, the beam center point 2 and the beam center point 3, respectively, can be calculated by the following formula:
Figure BDA0003016780500000051
wherein, i is 1,2,3, R is the radius of the earth, alphau、
Figure BDA0003016780500000052
Longitude coordinates, beta, of the satellite terminal and the beam center point i, respectivelyu、
Figure BDA0003016780500000053
Respectively the latitude coordinates of the satellite terminal and the beam center point i.
Then, for L1、L2And L3Make a comparison, assume L1Minimum, and L2And L3Are all greater than L1And + Δ L, the satellite terminal selects beam 1 to camp on, and then performs a normal location update procedure.
Example 2:
assuming that the satellite terminal is simultaneously covered by 3 beams, as shown in fig. 3, the satellite terminal has a distance L from the beam center point 1, the beam center point 2 and the beam center point 31、L2And L3Middle L1Minimum, L2Satisfy L2≤L1A + Δ L condition.
The satellite terminal obtains the self-motion direction from the integrated angular accelerometer and accelerometer, namely the included angle theta between the velocity vector and the northuAnd calculating the included angle theta between the satellite terminal and the connecting line of the beam central point 1 and the beam central point 2 and the velocity vector of the satellite terminal1、θ2The calculation method is as follows:
Figure BDA0003016780500000061
wherein m is 1, 2.
The satellite terminal then compares θ1And theta2The size of (2). Let θ be2＜θ1It can be considered that the satellite terminal moves for a longer time on the beam (beam 2) belonging to the beam center point with the small included angle, that is, the satellite terminal stays in the spot beam for a longer time. The satellite terminal selects beam 2 for camping and then performs the normal location update procedure.
The satellite terminal integrates the angular accelerometer and the accelerometer, and can acquire the movement speed and the movement direction (the included angle between the movement direction of the satellite terminal and the due north direction) of the satellite terminal in real time, so that the included angle between the movement direction of the satellite terminal and the connecting line between the satellite terminal and the beam central point 1 and the included angle between the movement direction of the satellite terminal and the connecting line between the satellite terminal and the beam central point 2 can be calculated. The satellite terminal moves for a longer time on the beam to which the beam center point with the small included angle belongs, that is, the satellite terminal stays in the spot beam for a longer time.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (4)

1. A satellite terminal beam selection method based on position information and motion trend is characterized by comprising the following specific steps:
s1, the multi-beam satellite mobile communication system broadcasts the longitude and latitude information of the central point position of each beam to the ground satellite terminal through the broadcast message;
s2, the ground satellite terminal continuously receives the broadcast message from the multi-beam satellite mobile communication system in the standby state, and obtains the self position information through the self positioning function, wherein the self position information comprises the self longitude and latitude information;
s3, the ground satellite terminal calculates the distance between the position and the central point of each wave beam capable of covering the position;
assuming that the ground satellite terminal is covered by N wave beams at the same time, the position of the ground satellite terminal and the ith wave beam BiDistance L between center pointsiExpressed as:
Figure FDA0003016780490000011
wherein, i is 1,2, …, N, R is the earth radius, alphau、
Figure FDA0003016780490000012
Respectively satellite terminal and beam BiLongitudinal coordinate of center point, betau、
Figure FDA0003016780490000013
Respectively satellite terminal and beam BiLatitude coordinates of the center point;
s4, the ground satellite terminal selects the minimum value in the plurality of distances calculated in the step S3, namely the beam corresponding to the minimum distance, judges whether other beams have the beams with the distance close to the distance of the ground satellite terminal and the minimum distance, if yes, all the beams meeting the condition and the beam corresponding to the minimum distance are selected, and the step S5 is executed, otherwise, the beam corresponding to the minimum distance is designated as the selected beam, and the step S7 is executed;
in step S4, the ground satellite terminal selects the beam B having the smallest distance from the beam center point from the N beamskI.e. by
Figure FDA0003016780490000014
k is the beam number of the beam corresponding to the minimum distance, LkFor the position of the ground satellite terminal and the kth wave beam BkRecording distance threshold value as delta L, determining its value according to diameter of beam coverage of satellite mobile communication system, and judging whether there is other beam Bj，1≤j≤N,j≠k,j∈N+Satisfy Lj≤(Lk+ Δ L), j is the beam number of the beam satisfying this condition, LjFor the position of the ground satellite terminal and the jth wave beam BjThe distance between the center points; if present, all beams satisfying this condition and beam BkStoring the set omega, executing the step S5, otherwise, storing the beam BkDesignated as the selected beam, step S7 is performed;
s5, the ground satellite terminal obtains self movement velocity vectors from the angular accelerometer and the accelerometer which are arranged on the ground satellite terminal, and calculates the included angle between the connection line of the ground satellite terminal and the central point of each wave beam and the movement velocity vectors of the satellite terminal;
s6, the ground satellite terminal selects the beam corresponding to the minimum included angle, namely the minimum included angle, among all the included angles calculated in the step S5, and designates the beam as the selected beam;
and S7, the ground satellite terminal resides in the selected beam and updates the position of the ground satellite terminal.
2. The satellite terminal beam selection method according to claim 1, wherein said step S5,
assuming that there are M beams in the set Ω, for the M-th beam bm，bmE Ω, M1, 2, …, M, terrestrial satellite terminal and beam bmThe calculation formula of the included angle between the central point connecting line and the motion velocity vector of the satellite terminal is as follows:
Figure FDA0003016780490000021
wherein the content of the first and second substances,
Figure FDA0003016780490000022
and
Figure FDA0003016780490000023
are respectively the wave beam bmLongitude and latitude coordinates of the center point, θuThe included angle between the velocity vector of the ground satellite terminal and the true north direction.
3. The satellite terminal beam selection method based on location information and motion trend according to claim 2,
in step S6, the ground satellite terminal selects the beam b corresponding to the minimum included angle calculated in step S5 from the set ΩcI.e. by
Figure FDA0003016780490000031
c is the wave beam serial number of the wave beam corresponding to the minimum included angle, and the wave beam bcDesignated as the selected beam.
4. The method of claim 1, wherein the method comprises:
the multi-beam satellite mobile communication system takes a spot beam as a paging area, and when the ground satellite terminal is paged, the gateway station pages the ground satellite terminal in the paging area where the satellite terminal is located; and in the moving process of the satellite terminal, if the located beam changes, updating the self-position information and informing the gateway station of the self-resident beam information.
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CN117749257A (en) * 2024-02-20 2024-03-22 成都星联芯通科技有限公司 Engineering realization method and device for searching high-orbit multi-beam by terminal and terminal equipment
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