CN110519695B - Database-assisted satellite system and ground cellular network spectrum sharing method - Google Patents

Database-assisted satellite system and ground cellular network spectrum sharing method Download PDF

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CN110519695B
CN110519695B CN201910471340.5A CN201910471340A CN110519695B CN 110519695 B CN110519695 B CN 110519695B CN 201910471340 A CN201910471340 A CN 201910471340A CN 110519695 B CN110519695 B CN 110519695B
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CN110519695A (en
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杨健
柳永祥
张建照
吴昊
乔晓强
张涛
王龙
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National University of Defense Technology
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    • H04W16/14—Spectrum sharing arrangements between different networks
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Abstract

The invention provides a database-assisted method for sharing a satellite system and a ground cellular network frequency spectrum. The method comprises the following steps: firstly, broadcasting a beam coverage range and overhead time of a satellite to a ground station by the satellite through a downlink, and forming a satellite trajectory database by the beam coverage range information and the overhead time information; then the ground station and the ground cellular network share a satellite trajectory database; and finally, when the cellular base station needs to access a millimeter wave frequency band for spectrum sharing, the cellular base station sends the position information of the cellular base station to a satellite track database, and the satellite track database feeds back the maximum available transmitting power of the cellular base station to the cellular base station. The method is simple, the time delay is controllable, the interruption probability of the satellite link is reduced, the utilization rate of the frequency spectrum opportunity is improved, and the throughput of the ground cellular network is improved.

Description

Database-assisted satellite system and ground cellular network spectrum sharing method
Technical Field
The invention belongs to the technical field of frequency spectrum sharing, and particularly relates to a frequency spectrum sharing method of a satellite system and a ground cellular network assisted by a database.
Background
At present, a radio system mainly utilizes 3MHz-3GHz spectrum resources to work, the 3MHz-3GHz spectrum resources are close to saturation due to the use of a plurality of radio systems, and the spectrum utilization rate of the frequency band is difficult to further improve in a short period. Above 3GHz, a large amount of frequency spectrum resources are allocated to the satellite system, on one hand, the frequency spectrum resources allocated to the satellite system are not fully utilized; on the other hand, by multiplexing a small part of spectrum resources in the millimeter wave band of 3GHz or more, the communication capacity can be improved by tens of times. Early, satellite bands rarely deployed other radio service systems due to the relatively high frequencies, such as the K-band (18-27GHz) and Ka-band (27-40 GHz). Currently, 5 th generation (5G) broadband cellular communication networks are exploring and utilizing millimeter wave frequency band spectrum resources, and the demand for the millimeter wave frequency band spectrum resources is greatly increased. Compared with the existing cellular system, the multiplexing of the frequency spectrum resources of the millimeter wave frequency band can solve the problem of the shortage of the frequency spectrum resources of the ground cellular network. Taking Low Earth Orbit (LEO) and Medium Earth Orbit (MEO) satellites as examples, the typical Orbit height of an LEO or MEO satellite is 200km to 20000km, which is equivalent to an Orbit period of 1.5-12 hours and an over-top time of 7-300 minutes, and if a ground cellular network accurately avoids the over-top time of an LEO or MEO satellite, a large number of spectrum access opportunities can be obtained.
In view of this, it is desirable to perform the millimeter wave frequency band coexistence analysis for the satellite system and the terrestrial cellular network. There have been some research results in this direction: to prevent earth stations from being interfered by a terrestrial cellular network, k.an et al (k.an, j.ouyang, m.lin, and t.liang, "output analysis of multi-antenna coherent satellite communication networks with beamforming," IEEE com.let., vol.17, No.7, pp.1344-1347, jul.2014.) have studied the constraint mechanism of multi-antenna beamforming under the interference temperature constraint condition; an et al (K.an, M.Lin, W.P.Zhu, Y.Huang, and G.Zheng, "output performance of cognitive satellite terrestrial networks with interference constraint," IEEE trans. Veh.Technol., vol.65, No.11, pp.9397-9404, Nov.2016.) analyzed the probability of Outage of cognitive satellite-based networks under interference constraint; lagunas et al (e.lagunas, s.k.shar, s.maleki, s.chatzenotas, and b.ottsten, "Resource allocation for coherent satellite communications with centralized computing networks," IEEE trans.coherent communication.and Networking, vol.1, No.3, pp.305-317, sept.2015.) analyzed the key performance improvement brought by the frequency band spectrum sharing of the satellite system and the terrestrial cellular network using the interference level as the main performance index. However, most of the existing work focuses on performance analysis and key parameter derivation, and how to achieve reliable millimeter wave spectrum sharing between the satellite system and the terrestrial cellular network is still not solved. Therefore, how to avoid the overhead time of an LEO or MEO satellite and obtain the space-time spectrum access opportunity on the premise of fully protecting a satellite link from interference has important application value.
However, the satellite signal is weak and vulnerable to interference, and when there is no dedicated satellite antenna for high gain reception of the satellite signal, the terrestrial cellular network cannot determine whether the satellite signal is present, i.e. whether the satellite is over-top, through spectrum sensing. If a user of the terrestrial cellular network misses a satellite signal during the satellite overhead period and still uses the same frequency as the satellite system to reuse the millimeter wave spectrum resource, the satellite link is severely interfered and even interrupted.
Disclosure of Invention
The invention aims to provide a high-reliability, low-time-delay and low-complexity database-assisted satellite system and ground cellular network spectrum sharing method.
The technical solution for realizing the purpose of the invention is as follows: a method for database assisted spectrum sharing between a satellite system and a terrestrial cellular network, comprising the steps of:
step 1, a satellite broadcasts a beam coverage range and overhead time to a ground station through a downlink, and beam coverage range information and overhead time information form a satellite trajectory database;
step 2, the ground station and the ground cellular network share a satellite trajectory database;
and 3, when the cellular base station needs to access a millimeter wave frequency band for spectrum sharing, the cellular base station sends the position information of the cellular base station to a satellite track database, and the satellite track database feeds back the maximum available transmitting power to the cellular base station.
Further, the satellite in step 1 broadcasts the beam coverage and the overhead time to the ground station through a downlink, and the beam coverage information and the overhead time information form a satellite trajectory database, which is specifically as follows:
the satellite broadcasts the satellite's beam coverage and over-the-top time to a ground station over a downlink, with the beam coverage information and over-the-top time information forming a satellite trajectory database, which when a satellite signal is received by a local earth station indicates that an LEO or MEO satellite is over-the-top and the earth station is within the beam coverage of the LEO or MEO satellite.
Further, the ground station and the ground cellular network in step 2 share a satellite trajectory database, which is specifically as follows:
after receiving the beam coverage information and the over-top time information broadcasted by the satellite, the earth station stores the beam coverage information and the over-top time information of the satellite into a satellite track database through a 4G mobile network, and a satellite system and a ground cellular network share the information of the satellite track database.
Further, when the cellular base station needs to access the millimeter wave frequency band for spectrum sharing in step 3, the cellular base station sends its own location information to the satellite trajectory database, and the satellite trajectory database feeds back the maximum available transmit power to the cellular base station, which is specifically as follows:
the satellite trajectory database calculates the distance d from the cellular base station to the center of the beam coverage area according to the position of the cellular base station and the center position of the beam coverage area; setting the coverage area of the spot beam to be R radius when LEO or MEO satellite passes through the topSATOf the area of the satellite is defined by the 3dB beam angle phi of the LEO or MEO satellite3dBDetermining; rCBSThe radius, which is determined by the earth station sensitivity, is:
(1) when d is less than or equal to RSATWhen the satellite trajectory database forbids the cellular base station to share the satellite-ground spectrum of the millimeter wave frequency band;
(2) when R isSAT＜d≤RCBSIn time, the satellite trajectory database feeds back the maximum uninterrupted transmit power (MOFTP) to the cellular base station, and the satellite trajectory database obtains the MOFTP by solving the following optimization problem:
Figure BDA0002080920660000031
the optimization problem is a non-convex non-linear optimization problem, PCBS,peakRepresenting peak transmit power，PCBSBelonging to a limited interval PCBS∈[0,PCBS,peak]MOFTP is obtained by an exhaustive method, i.e.
Figure BDA0002080920660000032
The cellular base station must adopt a structure smaller than
Figure BDA0002080920660000033
Carrying out data transmission by using the transmitting power; wherein, C (P)CBS) The throughput rate of the cellular base station when MOFTP is adopted for the cellular base station to transmit data;
(3) when d > RCBSThe satellite track database feeds back the peak transmitting power P to the cellular base stationCBS,peakAllowing the cellular base station to use the peak transmit power PCBS,peakAnd transmitting the data.
Compared with the prior art, the invention has the following remarkable advantages: (1) by sharing the information of the beam coverage and the overhead time, the ground cellular network realizes the reliable discovery of satellite signals, so that the satellite link can share the frequency spectrum resources of the millimeter wave frequency band on the premise of avoiding the interference of the ground cellular network, and the interruption probability of the satellite link is reduced; (2) the method has the advantages that the scheme is simple, the time delay is controllable, and the maximum available transmitting power of the cellular base station fed back by the database can be obtained only by sending the geographic position to the database by the cellular base station; (3) by fully protecting the satellite link and designing the low-complexity sharing strategy, the utilization rate of the frequency spectrum opportunity is improved, and the throughput of the ground cellular network is improved.
Drawings
Fig. 1 is a network scenario diagram of a method for spectrum sharing between a satellite system and a terrestrial cellular network assisted by a database according to the present invention.
Fig. 2 is a block flow diagram of a method for spectrum sharing between a database assisted satellite system and a terrestrial cellular network in accordance with the present invention.
Fig. 3 is a graph of satellite link outage probability versus cellular base station to beam coverage center distance in an embodiment of the present invention.
Fig. 4 is a graph of average satellite system throughput versus distance from a cellular base station to the center of beam coverage in an embodiment of the present invention.
Fig. 5 is a graph of average throughput of a cellular network versus distance from a cellular base station to a center of beam coverage in an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention provides a frequency spectrum sharing method of a satellite system and a ground Cellular network assisted by a database, wherein an LEO or MEO satellite broadcasts a beam coverage area and overhead time of the LEO or MEO satellite to a ground Station through a satellite downlink, the beam coverage area information and the overhead time information form a satellite track database, the ground Station and the ground Cellular network share the database, a Cellular Base Station (CBS) sends the geographical position of the Base Station to the satellite track database to obtain the maximum available transmitting power of the Cellular Base Station fed back by the satellite track database, and the frequency spectrum sharing of the satellite system and the ground Cellular network in a millimeter wave frequency band is realized under the assistance of the satellite track database.
A network scene of spectrum sharing between a database-assisted satellite system and a ground cellular network is shown in fig. 1, the ground cellular network reuses millimeter wave frequency band spectrum resources allocated to the satellite system on the premise of fully protecting a satellite link from interference, so that an earth station using the satellite link is set as a master user, and a cellular base station and a handheld terminal of the ground cellular network are set as secondary users; setting the coverage area of the spot beam of the LEO or MEO satellite to be R radius when the LEO or MEO satellite passes through the topSATOf the area of the satellite is defined by the 3dB beam angle phi of the LEO or MEO satellite3dBDetermining; the cellular base stations within the range of the beam coverage area can receive LEO or MEO satellite signals, and the cellular base stations outside the range of the beam coverage area cannot receive LEO or MEO satellite signals;
if the earth station is in a beam coverage range of an LEO or MEO satellite, the satellite link is considered to be activated, namely a primary user is in a use state (PU is 1), and cellular network users in the beam coverage area are forbidden to reuse millimeter wave frequency band spectrum resources allocated to a satellite system in a spectrum sharing mode;
if the earth station is out of the beam coverage range of the LEO or MEO satellite, the satellite link is considered to be inactivated, namely, the primary user is in an idle state (PU ═ 0), and the cellular network users within the beam coverage area can reuse the millimeter wave frequency band spectrum resources allocated to the satellite system in a spectrum sharing mode.
Setting d as the distance from the cellular base station to the center of the beam coverage area, and if d is less than or equal to R when the LEO or MEO satellite passes the topSATThen, cellular network users are prohibited from multiplexing millimeter wave frequency band spectrum resources allocated to the satellite system in a spectrum sharing manner, such as cellular base station 1 and handheld terminal users thereof in fig. 1; if d > RCBSThen cellular network users are allowed to reuse the millimeter wave band spectrum resources, R, allocated to the satellite system in a spectrum sharing mannerCBSIn order to ensure that the radius determined by the earth station sensitivity, i.e. the satellite link between the earth station disposed on this radius and the LEO or MEO satellite, is not interrupted, as in the case of the cellular base station 3 and its handheld terminal in fig. 1, the cellular base station 3 and its handheld terminal can now have its peak power PCBS,peakTransmitting data; if R isSAT＜d≤RCBSIt is necessary to allow the cellular network users to reuse the millimeter wave band spectrum resources allocated to the satellite system in a spectrum sharing manner, such as the cellular base station 2 and the handheld terminal users thereof in fig. 1, on the premise of controlling the transmission power of the cellular network users to prevent interference to the satellite link.
The conventional time-domain spectrum access opportunity in the satellite-ground spectrum sharing can be represented as the following binary hypothesis testing problem:
Figure BDA0002080920660000051
wherein H0Indicating that the satellite link is active, H1Indicating that the satellite link is inactive, x m]Representing the m-th sampled signal, sm, received by the earth station]Represents a downlink signal of a LEO or MEO satellite, M ═ 1, 2.., M; pSAT(h)＝Pt·Gtξ (h) is the power of the satellite downlink signal received at the earth station, where PtFor satellite downlinkTransmission power of signal, GtIn order to obtain the beam gain of the satellite antenna, xi (h) is a path attenuation factor determined by the satellite orbit height h; omega m]Sampling values representing noise components, setting
Figure BDA0002080920660000052
In a satellite-ground spectrum sharing network scenario, due to different distances from a cellular base station to a satellite beam coverage center, a space spectrum access opportunity is generated, and the space spectrum access opportunity is expressed as the following binary hypothesis testing problem:
Figure BDA0002080920660000053
wherein S0For d > RCBSThe cellular base station and the hand-held terminal user thereof have space spectrum access opportunity; s1For d ≦ RSATThe cellular base station and the handheld terminal user thereof do not have space-domain spectrum access opportunity, the time-domain spectrum access opportunity and the space-domain spectrum access opportunity are combined to obtain space-time spectrum access opportunity in satellite-ground spectrum sharing, and the space-time spectrum access opportunity in satellite-ground spectrum sharing can be modeled as follows:
Figure BDA0002080920660000054
wherein O is0Indicating the existence of an opportunity for space-time spectrum sharing, O1Indicates that there is no opportunity for space-time spectrum sharing, visible O0＝H0∪S0I.e. when LEO or MEO satellites are not overhead or d > RSATThere is a space-time spectrum access opportunity; o is1＝H1∩S1I.e., when the LEO or MEO satellite is over the top, the cellular base station and its handheld terminal users are within the beam coverage, there is no opportunity for space-time spectrum access. Therefore, how to accurately acquire satellite over-the-top time information and beam coverage information becomes a key to the opportunity for a cellular network to acquire spectrum access in satellite-to-ground spectrum sharingA key.
Referring to fig. 2, the method for sharing the spectrum between the satellite system and the terrestrial cellular network assisted by the database according to the present invention includes the following steps:
step 1, broadcasting a beam coverage range and overhead time of a satellite to a ground station by the satellite through a downlink, and forming a satellite trajectory database by using the beam coverage range information and the overhead time information, wherein the method specifically comprises the following steps:
first, an LEO or MEO satellite always broadcasts its beam coverage and time to over-the-top over the downlink to earth stations that, when a satellite signal is received by a ground station, indicate that the LEO or MEO satellite is over-the-top and that the earth station is within the beam coverage of the LEO or MEO satellite.
Step 2, the ground station and the ground cellular network share a satellite trajectory database, which comprises the following steps:
after receiving the beam coverage information and the over-top time information of the satellite broadcast, the earth station stores the beam coverage information and the over-top time information of the LEO or MEO satellite into a satellite track database through a 4G mobile network, and a satellite system and a ground cellular network share the information of the satellite track database.
Suppose that when the data rate is less than a predetermined threshold CoutWhen the satellite link is interrupted,
Figure BDA0002080920660000061
expressed as the minimum Signal to Interference plus Noise Ratio (SINR) to ensure the satellite link is uninterrupted. Obviously, the interruption is most likely to occur at the intersection of the line from the cellular base Station to the center of the beam coverage area and the beam coverage area, which is defined as the Worst Case Earth Station Position (WCESP), and if no satellite link interruption occurs at the Earth Station deployed at the WCESP, no satellite link interruption occurs at the Earth Station closer to the center of the beam coverage area. From the above reasoning, the outage probability of an earth station deployed at WCESP can be written as:
Figure BDA0002080920660000062
wherein gamma isESRepresents the average SINR of the earth stations at WCESP,
Figure BDA0002080920660000063
average received power at WCESP for cellular base station, where PCBSIs the transmission power of the cellular base station, ξ (d-R)SAT) Is d-RSATThe path loss of the optical fiber (A) is reduced,
Figure BDA0002080920660000064
and phi is the medium-scale shadow fading factor and the small-scale rayleigh fading factor, respectively. When the earth station is deployed in the WCESP, in order to avoid an interruption of the earth station satellite link, the Maximum Transmit Power that can be adopted by the cellular base station at this time is defined as Maximum uninterrupted Transmit Power (moutp), and then the throughput rate of the cellular base station may be written as:
C(PCBS)＝(1-P1)C0+P1(1-Pout,WCESP(PCBS))C1 (5)
wherein P isout,WCESP(PCBS) Can be calculated according to equation (4), P1＝TPT/TOPIs the satellite over-the-top probability, where TPTFor the satellite over-the-top time span, TOPIs the satellite orbital period, C0And C1Deployed on d > R basis for cellular foundations respectivelyCBSAnd RSAT＜d≤RCBSThe throughput at (b) can be written as:
Figure BDA0002080920660000071
Figure BDA0002080920660000072
wherein N is0In order to be able to measure the power of the noise,
Figure BDA0002080920660000073
is a honeycomb baseAverage attenuation factor of the station to the handheld terminal.
Thus, the first term to the right of the equality sign of equation (5) represents a disposition d > RCBSAt power PCBS,peakPerforming data transmission, and the second item is deployed at RSAT＜d≤RCBSCellular base station of PCBSAnd carrying out data transmission.
Step 3, when the cellular base station needs to access the millimeter wave frequency band for spectrum sharing, the cellular base station sends the position information of the cellular base station to the satellite track database, and the satellite track database feeds back the maximum available transmitting power to the cellular base station, specifically as follows:
when a cellular base station needs to access millimeter wave frequency band spectrum resources allocated to a satellite system in a spectrum sharing mode for data transmission, the cellular base station sends own position information to a satellite track database, the satellite track database calculates the distance d from the cellular base station to the center of a beam coverage area according to the position of the cellular base station and the position of the center of the beam coverage area, and when an LEO or MEO satellite passes through the top, the radius of the coverage area of a spot beam is set to be RSATOf the area of the satellite is defined by the 3dB beam angle phi of the LEO or MEO satellite3dBDetermining; rCBSThe radius, which is determined by the earth station sensitivity, is:
when d is less than or equal to RSATThen, the satellite trajectory database requires the cellular base station to stop the sharing of the satellite-ground spectrum of the millimeter wave frequency band;
when R isSAT＜d≤RCBSAnd then, the satellite track database feeds back the maximum uninterrupted transmission power MOFTP to the cellular base station, and the MOFTP is obtained by solving the following optimization problems:
Figure BDA0002080920660000074
the optimization problem is a non-convex, non-linear optimization problem, and therefore it is difficult to give an analytical form of solution, but note that PCBSBelonging to a limited interval PCBS∈[0,PCBS,peak]，PCBS,peakRepresents the peak transmit power and thus mayMOFTP is obtained by exhaustive methods, i.e.
Figure BDA0002080920660000075
The cellular base station must adopt a structure smaller than
Figure BDA0002080920660000076
Carrying out data transmission by using the transmitting power; wherein, C (P)CBS) The throughput rate of the cellular base station when MOFTP is adopted for the cellular base station to transmit data;
when d > RCBSThe satellite track database feeds back the peak transmitting power P to the cellular base stationCBS,peakThe cellular base station may use the peak transmit power PCBS,peakAnd transmitting the data.
Example 1
The following embodiments are combined to evaluate key performance indicators in spectrum sharing between a database-assisted satellite system and a terrestrial cellular network, and the basic parameter settings are shown in table 1:
table 1 table of parameter settings for performance evaluation
Figure BDA0002080920660000081
The following two comparative references were set:
(1) satellite-ground spectrum sharing based on cellular network perception: the cellular network determines whether the satellite is over the top through spectrum sensing. When the cellular base station detects the satellite signal, the satellite is over the top, and the cellular base station is deployed in the coverage area of the satellite beam, the cellular base station immediately stops sharing the frequency spectrum resource of the millimeter wave frequency band with the satellite system, and switches to other frequency bands. Since the satellite signal is weak and difficult to accurately detect, the detection probability and the false alarm probability for the satellite signal are set to 0.9 and 0.1, respectively.
(2) Satellite-ground spectrum sharing based on earth station perception: the earth station determines whether the satellite is over the top through spectrum sensing. When the earth station detects a satellite signal indicating that the satellite is over the top and the earth station is deployed within the satellite beam coverage area, the earth station immediately shares that information with the terrestrial cellular network. Cellular base stations within or near the beam coverage area then adjust the transmit power while ensuring the satellite link is uninterrupted. Since the earth station has some prior information of the satellite signal, the detection probability and the false alarm probability for the satellite signal are set to 0.95 and 0.05, respectively.
Fig. 3 shows the relationship between the probability of satellite link interruption and the distance from the cellular base station to the beam coverage center under three types of satellite-ground spectrum sharing, and a higher probability of satellite link interruption indicates that the detection of satellite signals through spectrum sensing only is unreliable. Since cellular base stations deployed near and outside the satellite beam coverage area cannot detect the satellite signal, data is transmitted at peak power, causing the satellite link to be severely broken. After the database-assisted satellite system and ground cellular network spectrum sharing method establishes a coordination mechanism through a satellite trajectory database, the probability of interruption is remarkably reduced from the comparison of satellite-ground spectrum sharing based on earth station sensing and satellite-ground spectrum sharing assisted by the database. Furthermore, when a database-assisted satellite-to-ground spectrum sharing scheme is employed, the satellite link outage probability is reduced to zero, indicating adequate protection of the satellite link.
Figure 4 shows the average throughput of a satellite system as a function of the distance from the cellular base station to the center of beam coverage. Due to the full protection of the satellite link, the average throughput rate of the satellite system under the spectrum sharing method of the database-assisted satellite system and the ground cellular network is obviously superior to that of the satellite-ground spectrum sharing based on cellular network/earth station sensing. In addition, as the distance from the cellular base station to the beam coverage center increases, the average throughput rate of the satellite system of the three schemes slightly increases.
Figure 5 shows the average throughput of a cellular network as a function of the distance from the cellular base station to the center of beam coverage. Since the transmit power limit in the database assisted satellite system and terrestrial cellular network spectrum sharing method is more stringent than the satellite-to-ground spectrum sharing scheme based on earth station awareness, the average throughput of the cellular network is lower around the beam coverage area; as the distance from the cellular base station to the beam coverage center increases, the average throughput rate of the cellular base station in the spectrum sharing method of the database-assisted satellite system and the ground cellular network gradually increases until the average throughput rate of the cellular base station in the satellite-ground spectrum sharing scheme based on the perception of the earth station is exceeded. For the satellite-ground spectrum sharing scheme based on cellular network perception and the satellite-ground spectrum sharing scheme based on earth station perception, the throughput of the satellite-ground spectrum sharing scheme based on cellular network perception and the satellite-ground spectrum sharing scheme based on earth station perception is kept unchanged when the distance from a cellular base station to the beam coverage center is increased, and the beam coverage does not influence the transmitting power of the cellular base station in the two schemes.

Claims (4)

1. A method for sharing a spectrum between a database-assisted satellite system and a terrestrial cellular network, comprising the steps of:
step 1, a satellite broadcasts a beam coverage range and overhead time to a ground station through a downlink, and beam coverage range information and overhead time information form a satellite trajectory database;
step 2, the ground station and the ground cellular network share a satellite trajectory database;
and 3, when the cellular base station needs to access a millimeter wave frequency band for spectrum sharing, the cellular base station sends the position information of the cellular base station to a satellite track database, and the satellite track database feeds back the maximum available transmitting power to the cellular base station.
2. The method for spectrum sharing between a satellite system and a terrestrial cellular network assisted by a database according to claim 1, wherein the satellite in step 1 broadcasts beam coverage and over-time to the ground station via downlink, and the beam coverage information and the over-time information form a satellite trajectory database, which is as follows:
the satellite broadcasts the satellite's beam coverage and over-the-top time over the downlink to the ground station, the beam coverage information and over-the-top time information forming a satellite trajectory database that, when the ground station receives the satellite signal, indicates that the LEO or MEO satellite is over-the-top and that the ground station is within the beam coverage of the LEO or MEO satellite.
3. The method of claim 1, wherein the ground station and the terrestrial cellular network in step 2 share a satellite trajectory database, specifically as follows:
after receiving the beam coverage information and the over-top time information broadcasted by the satellite, the ground station stores the beam coverage information and the over-top time information of the satellite into a satellite track database through a 4G mobile network, and a satellite system and a ground cellular network share the information of the satellite track database.
4. The method for spectrum sharing between a satellite system and a terrestrial cellular network assisted by a database according to claim 1, wherein in step 3, when the cellular base station needs to access a millimeter wave frequency band for spectrum sharing, the cellular base station sends its location information to the satellite trajectory database, and the satellite trajectory database feeds back the maximum available transmit power to the cellular base station, which is specifically as follows:
the satellite trajectory database calculates the distance d from the cellular base station to the center of the beam coverage area according to the position of the cellular base station and the center position of the beam coverage area; setting the coverage area of the spot beam to be R radius when LEO or MEO satellite passes through the topSATOf the area of the satellite is defined by the 3dB beam angle phi of the LEO or MEO satellite3dBDetermining; rCBSThe radius, which is determined by the sensitivity of the ground station, is:
(1) when d is less than or equal to RSATWhen the satellite trajectory database forbids the cellular base station to share the satellite-ground spectrum of the millimeter wave frequency band;
(2) when R isSAT＜d≤RCBSIn time, the satellite trajectory database feeds back the maximum uninterrupted transmit power (MOFTP) to the cellular base station, and the satellite trajectory database obtains the MOFTP by solving the following optimization problem:
Figure FDA0002733421440000021
the optimization problem is a non-convex non-linearityOptimization problem, PCBS,peakRepresenting the peak transmit power, PCBSFor the transmission power, P, of the cellular base stationCBSBelonging to a limited interval PCBS∈[0,PCBS,peak]MOFTP is obtained by an exhaustive method, i.e.
Figure FDA0002733421440000022
The cellular base station must adopt a structure smaller than
Figure FDA0002733421440000023
Carrying out data transmission by using the transmitting power; wherein, C (P)CBS) The throughput rate of the cellular base station when MOFTP is adopted for the cellular base station to transmit data;
(3) when d > RCBSThe satellite track database feeds back the peak transmitting power P to the cellular base stationCBS,peakAllowing the cellular base station to use the peak transmit power PCBS,peakAnd transmitting the data.
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