Method and device for interference protection of 5g base station by non-geostationary satellite shipborne dinning through

Abstract

The application provides a non-stationary satellite shipborne moving target indicator (MTI) interference protection method and device for a 5G base station, and the method comprises the following steps: obtaining a probability distribution of a discrimination angle; the discrimination angle is obtained according to the position of the shipborne MTI, the position of the 5G base station and the position of an access satellite; the interference protection distance of the 5G base station is calculated based on the probability distribution of the discrimination angle and the static protection range of the 5G base station; and the transmission power of the current shipborne MTI is adjusted when the distance between the current shipborne MTI and the 5G base station is less than the interference protection distance. The interference protection distance of the 5G base station under the condition of a non-stationary satellite is obtained first, and then the transmission power of the current shipborne MTI is adjusted when the distance between the current shipborne MTI and the 5G base station is less than the interference protection distance, so that the same-frequency interference generated by the current shipborne MTI on the 5G base station in the Ka frequency band can be reduced, and the shipborne MTI and the 5G base station can communicate in the same frequency and coexist under the condition of less interference on the 5G base station.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a method and device for interference protection of a non-stationary satellite shipborne dynamic channel to a 5G base station. BACKGROUND

[0002] At present, the non-stationary orbit satellite communication constellation represented by OneWeb and Starlink is developing rapidly, and broadband service through satellites has become a new way to access the Internet. In addition to traditional fixed earth stations, the ground segment of the satellite system also includes a considerable number of airborne, vehicle-mounted and shipborne dynamic channel earth stations. Dynamic channel application can extend broadband Internet service to areas such as aviation, ocean and desert where there is no Internet access service. On the other hand, 5G service has gradually become the mainstream of mobile communication, and satellite systems and 5G systems coexist in the Ka frequency band. Therefore, it is inevitable to cause co-frequency interference. Compared with 4G base stations, 5G base stations have smaller coverage and more dense distribution, and when the dynamic channel earth station is working, the position changes all the time, the distribution area is flexible and variable, and multiple stations interfere at the same time, so it is difficult to control the interference between the dynamic channel earth station and the 5G system.

[0003] At present, the main way to alleviate the co-frequency interference between the satellite system and the 5G system is to set a protection distance, that is, to ensure that the two are geographically separated by a distance to form an air space isolation. The mainstream protection distance setting method includes "dig hole type" and "pull away type". "Dig hole type" is commonly used in urban scenarios, and 5G system base stations are distributed more densely, so the base stations are distributed around the earth station, forming a "dig hole type" topology. In the suburban scenario, the 5G system is sparsely distributed, so the satellite system earth station is distributed on one side of the 5G system base station, forming a "pull away type" topology.

[0004] The above method of setting a protection distance is commonly used for interference mitigation between satellite system fixed earth stations and 5G base stations, and is not suitable for mobile dynamic channel earth stations (such as shipborne dynamic channel earth stations). For dynamic channel earth stations, especially shipborne dynamic channel earth stations working in motion, it is a problem to be solved to realize the coexistence of the dynamic channel earth station and the 5G base station in the same frequency under the condition of non-stationary orbit satellites. SUMMARY

[0005] In view of the above problems, the embodiments of the present application provide a method and device for interference protection of a non-stationary satellite shipborne dynamic channel to a 5G base station to realize the coexistence of the shipborne dynamic channel and the 5G base station in the same frequency.

[0006] In a first aspect, the embodiments of the present application provide a method for interference protection of a non-stationary satellite shipborne dynamic channel to a 5G base station, comprising the steps of:

[0007] obtaining a probability distribution of the discrimination angle; the method for obtaining the discrimination angle comprises: calculating according to the position of the shipborne moving target indicator, the position of the 5G base station and the position of the access satellite;

[0008] calculating the interference protection distance of the 5G base station based on the probability distribution of the discrimination angle and the static protection range of the 5G base station;

[0009] adjusting the transmission power of the current shipborne moving target indicator when the distance between the current shipborne moving target indicator and the 5G base station is less than the interference protection distance.

[0010] In the embodiment, the interference protection distance of the 5G base station under the condition of non-stationary satellite is obtained first, and then the transmission power of the current shipborne moving target indicator is adjusted when the distance between the current shipborne moving target indicator and the 5G base station is less than the interference protection distance, so that the same-frequency interference generated by the current shipborne moving target indicator on the 5G base station in the Ka frequency band can be reduced, and the shipborne moving target indicator and the 5G system can coexist in the same frequency under the condition of less interference on the 5G base station.

[0011] Optionally, the method for obtaining the probability distribution of the discrimination angle comprises:

[0012] obtaining a plurality of sets of historical time data, the plurality of sets of historical time data comprising a plurality of historical times and the position of the shipborne moving target indicator and the position of the access satellite corresponding to each historical time;

[0013] calculating the discrimination angle corresponding to each historical time according to the plurality of sets of historical time data and the position of the 5G base station;

[0014] recording the plurality of historical times and the discrimination angle corresponding to each historical time, and calculating the probability distribution of the discrimination angle.

[0015] The embodiment can statistically obtain the discrimination angle in the time dimension and obtain the probability distribution thereof.

[0016] Optionally, the method for obtaining the static protection range comprises: calculating according to the discrimination angle and the interference protection limit value of the 5G base station.

[0017] Optionally, the method for calculating the interference protection distance of the 5G base station based on the probability distribution of the discrimination angle and the static protection range of the 5G base station comprises:

[0018] setting the probability distribution of the interference protection distance equal to the probability distribution of the discrimination angle, so that the interference protection distance is equal to the probability expectation of the static protection range of the 5G base station.

[0019] Optionally, setting the probability distribution of the interference protection distance equal to the probability distribution of the discrimination angle, so that the interference protection distance is equal to the probability expectation of the static protection range of the 5G base station specifically comprises:

[0020] setting the probability distribution of the interference protection distance d S equal to the probability distribution of the discrimination angle α, so that the interference protection distance dS Equal to static protection range The expected probability, i.e.:

[0021]

[0022] Where M is the number of distribution intervals of the discrimination angle, p da (α i Let α be the probability distribution of the discrimination angle α.

[0023] Optionally, the interference protection distance of the 5G base station, calculated based on the probability distribution of the discrimination angle and the static protection range of the 5G base station, includes:

[0024] The interference protection distance is calculated based on the interference exceedance duration, the probability distribution of the discrimination angle, and the static protection range corresponding to the interference protection distance.

[0025] Optionally, the interference protection distance is calculated based on the interference exceedance duration corresponding to the interference protection distance, the probability distribution of the discrimination angle, and the static protection range.

[0026] Set interference protection distance d S The expected probability of the percentage of time the interference exceeds the limit is p. th ,but:

[0027]

[0028] Where d is the discrimination angle α i Static protection range at that time To distinguish the angle α i The percentage of interference exceeding the standard when the static protection range is d; the value of the interference protection range d obtained by solving the above formula is the interference protection distance d. S The value of .

[0029] This embodiment is based on the dynamic scenario of a non-geostationary orbit constellation. It conforms to the actual link pointing distribution from the perspective of probability expectation, thereby obtaining a reasonable interference protection distance, which is conducive to improving the utilization efficiency of satellite frequency resources.

[0030] Optionally, adjusting the current shipborne mobile communication transmitter power includes reducing the current shipborne mobile communication transmitter power.

[0031] Optionally, adjusting the current shipborne mobile communication transmitter power includes turning off the current shipborne mobile communication transmitter.

[0032] In this embodiment, when the distance between the shipborne mobile communication system and the 5G base station is less than the interference protection distance, the transmission power is reduced or turned off, which can protect the 5G system with priority.

[0033] In a second aspect, the embodiments of the present application also provide a non-geostationary satellite shipborne dynamic CU's interference protection method for a 5G base station, including the following steps.

[0034] a probability distribution acquisition module, configured to acquire a probability distribution of the discrimination angle; the discrimination angle is acquired according to the position of the shipborne dynamic CU, the position of the 5G base station and the position of the access satellite;

[0035] a protection distance calculation module, configured to calculate the interference protection distance of the 5G base station based on the probability distribution of the discrimination angle and the static protection range of the 5G base station;

[0036] an adjustment module, configured to adjust the transmission power of the current shipborne dynamic CU when the distance between the current shipborne dynamic CU and the 5G base station is less than the interference protection distance.

[0037] The embodiments of the present application have the following beneficial effects:

[0038] The embodiments of the present application first acquire the interference protection distance of the 5G base station under the condition of non-geostationary satellites, and then adjust the transmission power of the current shipborne dynamic CU when the distance between the current shipborne dynamic CU and the 5G base station is less than the interference protection distance, so as to reduce the co-frequency interference of the current shipborne dynamic CU on the 5G base station in the Ka frequency band, and realize the coexistence of the shipborne dynamic CU and the 5G system in the case of less interference on the 5G base station. The embodiments of the present application are based on the dynamic scene of non-geostationary satellite constellation, and obtain reasonable interference protection distance from the perspective of probability expectation, so as to improve the utilization efficiency of satellite frequency resources. The embodiments of the present application have strong applicability, and are applicable to various types of satellite constellation systems in geostationary orbit and non-geostationary orbit, and are also applicable to various types of coastal areas containing different ship passing frequencies and 5G base station distributions.

[0039] These aspects or other aspects of the present application will be more apparent in the following description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 FIG. 1 shows a flowchart of the non-geostationary satellite shipborne dynamic CU's interference protection method for a 5G base station provided by the embodiments of the present application.

[0042] Figure 2 FIG. 2 shows a scene diagram of the non-geostationary satellite shipborne dynamic CU's interference protection method for a 5G base station provided by the embodiments of the present application.

[0043] Figure 3 A structural schematic diagram of an interference protection device of a non-stationary satellite shipborne dynamic channel to a 5G base station provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0044] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components are denoted by the same or similar reference numerals, and therefore repeated description is omitted. The embodiments described below are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present application.

[0045] In order to enable persons skilled in the art to better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second and the like are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between or among the entities or actions.

[0047] Moreover, the terms "comprising", "comprises", "comprised of" or "comprising of", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0048] In the description of the embodiments of the present application, the words "example" or "for example" or the like are used to mean "an example of" or "for example of". Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not interpreted as more preferred or having more advantages than another embodiment or design scheme. The words "example" or "for example" or the like are intended to present a relative concept in a clear manner.

[0049] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could include A, B, C, A and B, A and C, B and C, or A and B and C.

[0050] This application provides a method for protecting 5G base stations from interference caused by non-stationary satellite-borne mobile communication systems, such as... Figure 1 As shown, the steps include:

[0051] S1, Obtain the probability distribution of the discrimination angle; the discrimination angle is obtained by calculation based on the shipborne mobile communication location, the 5G base station location, and the access satellite location;

[0052] S2, the interference protection distance of the 5G base station is calculated based on the probability distribution of the discrimination angle and the static protection range of the 5G base station;

[0053] S3: When the distance between the current shipborne mobile communication device and the 5G base station is less than the interference protection distance, adjust the transmission power of the current shipborne mobile communication device.

[0054] In this context, the shipborne mobile communication station's location refers to the location of the shipborne mobile communication earth station. Based on the satellite system's operating mode, the shipborne mobile communication station selects one of the non-geostationary satellites for access according to its own access strategy; this satellite is the access satellite. The vertex of the identification angle can be the shipborne mobile communication station's location, the 5G base station's location, or the access satellite's location. In this embodiment, the shipborne mobile communication station's location is used as the vertex of the identification angle. For example... Figure 2 As shown, based on the spatial distribution of satellites or constellations, the visible satellites for shipborne mobile communication can be calculated, and the access satellites and communication link directions can be determined in real time based on the access switching operation mode of the shipborne mobile communication. When the shipborne mobile communication connects to a satellite, its transmitting antenna's main axis points towards the satellite. Based on the shipborne mobile communication's transmitting power and antenna characteristics, its radiated energy towards the 5G base station in the discrimination angle direction is determined. This embodiment describes a single 5G base station; in practical applications, it can be extended to multiple 5G base stations.

[0055] In this embodiment, the interference protection distance of the 5G base station under non-stationary satellite conditions is first obtained. Then, when the distance between the current shipborne mobile communication device and the 5G base station is less than the interference protection distance, the transmission power of the current shipborne mobile communication device is adjusted, which can reduce the co-channel interference of the current shipborne mobile communication device to the 5G base station in the Ka band. Compared with the traditional "hole-digging" and "remote" protection distance setting methods, this embodiment is more suitable for shipborne mobile communication devices operating in dynamic scenarios, improving flexibility.

[0056] In some embodiments, obtaining the probability distribution of the discrimination angle specifically includes:

[0057] Obtaining a plurality of sets of historical time data, the plurality of sets of historical time data including a plurality of historical times and a shipborne mobile communication position corresponding to each historical time, an access satellite position corresponding to each historical time;

[0058] According to the plurality of sets of historical time data and the 5G base station position, a discrimination angle corresponding to each historical time is calculated;

[0059] Recording a plurality of historical times and a discrimination angle corresponding to each historical time, and calculating a probability distribution of the discrimination angle.

[0060] Among them, the plurality of sets of historical time data can be data of a continuous period of time, and the specific length can be set according to actual conditions, which is not limited here.

[0061] As an embodiment, in the geocentric and geostationary coordinate system, according to the shipborne mobile communication position 5G base station position Access satellite position The discrimination angle α is obtained, which can be represented as:

[0062]

[0063] Further, the discrimination angle of the i-th time is denoted as α i , the size of the discrimination angle α i of each time is recorded, and the probability distribution of the discrimination angle is calculated, denoted as p da (α i ).

[0064] This embodiment statistically analyzes the discrimination angle in the time dimension and obtains its probability distribution. In addition, this embodiment can also calculate the transmission and reception gains in the direction of the discrimination angle.

[0065] In other embodiments, the static protection range obtaining method includes: calculating

[0066] As an embodiment, the receive antenna pattern of the 5G base station is set as:

[0067]

[0068] Among them, G r,IMT (·) represents the receive antenna gain of the 5G base station, where the subscript r represents reception, and the subscript IMT represents the 5G system (International Mobile Telecommunication-2020, IMT). θ is the elevation angle of the receive antenna of the 5G base station, which varies in the range of 0°-180°. Azimuth of the receiving antenna of the 5G base station, ranging from -180° to 180°.

[0069] The transmitting pattern of the ship-borne moving station is set as:

[0070] G t,ESV = G t,ESV (γ)

[0071] wherein G t,ESV (·) represents the transmitting gain of the ship-borne moving station, the subscript t represents transmission, and the subscript ESV represents the ship-borne moving station (Earth Station on board Vessel, ESV). γ is the off-axis angle of the transmitting antenna of the ship-borne moving station (i.e., the included angle between the transmitting antenna of the ship-borne moving station and the 5G base station).

[0072] According to the working characteristics of the 5G system, an interference protection limit value is obtained. The method for obtaining the interference protection limit value includes but is not limited to the method described in the ITU-R M.2292 recommendation. Generally, the proportion of the time length during which the interference evaluation index is greater than a certain value (for example, the interference-to-noise ratio I / N>-6dB) does not exceed a certain limit value, which is denoted as p th .

[0073] According to the interference protection limit value, a protection range that does not exceed the standard when the 5G base station is interfered under the condition of a certain discrimination angle, i.e., a static protection range, is obtained. When the discrimination angle is determined as α0, the interference received by the 5G base station can be represented as:

[0074]

[0075] wherein P ESV is the transmitting power of the ship-borne moving station, θ(α0) and are the receiving elevation angle and the receiving azimuth angle of the 5G base station antenna determined by the discrimination angle α0, λ is the signal wavelength, and d is the interference link distance. According to the interference protection limit value, the static protection range under the condition of the determined discrimination angle α0 is obtained by comprehensively considering factors such as the frequency of the ship passing through, which is denoted as The calculation method of the static protection range in this embodiment includes but is not limited to the method described in the ITU-R SF.1650 recommendation.

[0076] The present embodiment can comprehensively consider factors such as the frequency of the ship passing through, thereby improving the accuracy.

[0077] In other embodiments, step S2 comprises:

[0078] When the probability distribution of the interference protection distance is equal to the probability distribution of the discrimination angle, the interference protection distance is equal to the probability expectation of the static protection range of the 5G base station.

[0079] As one implementation method, if the probability distribution of the interference protection distance is set to be equal to the probability distribution of the discrimination angle, then the expected probability that the interference protection distance is equal to the static protection range of the 5G base station specifically includes:

[0080] Set interference protection distance d S If the probability distribution of the interference protection distance d is equal to the probability distribution of the discrimination angle α, then the interference protection distance d S Equal to static protection range The expected probability, i.e.:

[0081]

[0082] Where M is the number of distribution intervals of the discrimination angle, p da (α i Let α be the probability distribution of the discrimination angle α.

[0083] In this embodiment, the interference protection distance can be calculated by the probabilistic expectation of the static protection range of the 5G base station, which has low computational complexity and improves computational efficiency.

[0084] In other embodiments, step S2 includes:

[0085] The interference protection distance is calculated based on the interference exceedance duration, the probability distribution of the discrimination angle, and the static protection range corresponding to the interference protection distance.

[0086] As one implementation method, the interference protection distance is calculated based on the interference exceedance duration corresponding to the interference protection distance, the probability distribution of the discrimination angle, and the static protection range.

[0087] Set interference protection distance d S The expected probability of the percentage of time the interference exceeds the limit is p. th ,but:

[0088]

[0089] Where d is the discrimination angle α i Static protection range at that time To distinguish the angle α i The percentage of interference exceeding the limit when the static protection range is d. The value of the interference protection range d obtained by solving the above formula is the interference protection distance d. S The value of d. In this embodiment, the interference protection distance d can be calculated by traversal or Newton's method. S The value of .

[0090] In this embodiment, the interference protection distance is calculated based on the interference exceeding the standard duration, the probability distribution of the identification angle, and the static protection range.

[0091] This embodiment is based on the dynamic scenario of a non-stationary orbit constellation. It conforms to the actual link pointing distribution from the perspective of probability expectation, thereby obtaining a reasonable interference protection distance, which is conducive to improving the utilization efficiency of space frequency resources.

[0092] In other embodiments, adjusting the current transmission power of the shipborne mobile communication device includes reducing the transmission power of the current shipborne mobile communication device.

[0093] In other implementations, adjusting the transmission power of the current shipborne mobile communication device includes turning off the transmission of the current shipborne mobile communication device.

[0094] In this embodiment, when the distance between the current shipborne mobile communication device and the 5G base station is less than the interference protection distance, the transmission power is reduced or turned off, which can protect the 5G system with priority.

[0095] This invention also provides a device for protecting 5G base stations from interference caused by non-stationary satellite-borne mobile communication systems, such as... Figure 3 As shown, it includes:

[0096] The probability distribution acquisition module is used to obtain the probability distribution of the discrimination angle; the methods for obtaining the discrimination angle include: calculation based on the shipborne mobile communication location, the 5G base station location, and the access satellite location;

[0097] The protection distance calculation module is used to calculate the interference protection distance of the 5G base station based on the probability distribution of the discrimination angle and the static protection range of the 5G base station.

[0098] The adjustment module is used to adjust the transmission power of the current shipborne mobile communication device when the distance between the current mobile communication device and the 5G base station is less than the interference protection distance.

[0099] In this context, the shipborne mobile communication station's location refers to the location of the shipborne mobile communication earth station. Based on the satellite system's operating mode, the shipborne mobile communication station selects one of the non-geostationary satellites for access according to its own access strategy; this satellite is the access satellite. The vertex of the discrimination angle can be the shipborne mobile communication station's location, the 5G base station's location, or the access satellite's location. In this embodiment, the shipborne mobile communication station's location is used as the vertex of the discrimination angle. Based on the spatial distribution of satellites or constellations, the visible satellites of the shipborne mobile communication station can be calculated, and based on the shipborne mobile communication station's access switching operating mode, its access satellite and communication link direction can be determined in real time. When the shipborne mobile communication station accesses a satellite, its transmitting antenna's main axis points towards the satellite. Based on the shipborne mobile communication station's transmitting power and antenna characteristics, its radiated energy towards the 5G base station in the discrimination angle direction is determined.

[0100] In this embodiment, the interference protection distance of the 5G base station under non-stationary satellite conditions is first obtained. Then, when the distance between the current shipborne mobile communication device and the 5G base station is less than the interference protection distance, the transmission power of the current shipborne mobile communication device is adjusted, which can reduce the co-channel interference of the current shipborne mobile communication device to the 5G base station in the Ka band. Compared with the traditional "hole-digging" and "remote" protection distance setting methods, this embodiment is more suitable for shipborne mobile communication devices operating in dynamic scenarios, improving flexibility.

[0101] In some implementations, obtaining the probability distribution of the discrimination angle specifically includes:

[0102] Acquire multiple sets of historical time data, including multiple historical times and the corresponding shipborne mobile communication position and access satellite position for each historical time;

[0103] The discrimination angle corresponding to each historical moment is calculated based on multiple sets of historical moment data and the location of 5G base stations;

[0104] Record multiple historical moments and the corresponding discrimination angle for each historical moment, and calculate the probability distribution of the discrimination angle.

[0105] Among them, multiple sets of historical time data can be data for a continuous period of time, and the specific length can be set according to the actual situation, without any restrictions here.

[0106] As one implementation method, in the geocentric coordinate system, based on the ship's dynamic position... 5G base station location Access satellite location The discrimination angle α can be expressed as:

[0107]

[0108] Furthermore, the discrimination angle at time i is denoted as α. i Record the identification angle α at each moment. i The size of the angle is used to calculate the probability distribution of the discrimination angle, denoted as p. da (α i ).

[0109] This embodiment statistically analyzes the discrimination angle over time to obtain its probability distribution. Furthermore, this embodiment can also calculate the transmit and receive gains in the direction of the discrimination angle separately.

[0110] In other implementations, the static protection range is obtained by calculation based on the discrimination angle and the interference protection limit of the 5G base station.

[0111] As one implementation method, the receiving antenna pattern of the 5G base station is set as follows:

[0112]

[0113] Among them, G r,IMT (·) represents the receiving antenna gain of the 5G base station, where the subscript r indicates receiving and the subscript IMT indicates 5G system (International Mobile Telecommunication-2020, IMT). θ is the elevation angle of the receiving antenna of the 5G base station, ranging from 0° to 180°; This refers to the azimuth angle of the receiving antenna of a 5G base station, ranging from -180° to 180°.

[0114] The launch pattern of the shipborne mobile communication system is set as follows:

[0115] G t,ESV =G t,ESV (γ)

[0116] Among them, G t,ESV (·) indicates the gain of the shipborne Earth Station on Board Vessel (ESV). In the subscript, t represents transmission, and ESV represents the Earth Station on Board Vessel (ESV). γ is the off-axis angle of the shipborne ESV transmitting antenna (i.e., the angle between the shipborne ESV transmitting antenna and the 5G base station).

[0117] Based on the operating characteristics of 5G systems, interference protection limits are obtained. Methods for obtaining these limits include, but are not limited to, those described in the ITU-R Recommendation M.2292. Typically, this is expressed as follows: the percentage of time during which an interference evaluation index exceeds a certain value (e.g., interference-to-noise ratio I / N > -6dB) does not exceed a certain limit, denoted as p. th .

[0118] Based on the interference protection limit, the protection range that ensures the 5G base station is not disturbed beyond the limit under a given discrimination angle is obtained; this is the static protection range. When the discrimination angle is determined to be α0, the interference experienced by the 5G base station can be expressed as:

[0119]

[0120] Among them, P ESV For the transmission power of the shipborne mobile communication device, θ(α0) and Let α0 be the elevation and azimuth angles of the 5G base station antenna, determined by the discrimination angle α0, λ be the signal wavelength, and d be the interference link distance. Based on the interference protection limit and considering factors such as the frequency of ship passage, the static protection range under the given discrimination angle α0 is obtained, denoted as . The method for calculating the static protection range in this embodiment includes, but is not limited to, the method described in ITU-R Recommendation SF.1650.

[0121] This implementation method takes into account factors such as the frequency of ship passage, thus improving accuracy.

[0122] In other embodiments, the protection distance calculation module is specifically used for:

[0123] If the probability distribution of the interference protection distance is set to be equal to the probability distribution of the discrimination angle, then the interference protection distance is equal to the expected probability of the static protection range of the 5G base station.

[0124] As one implementation method, if the probability distribution of the interference protection distance is set to be equal to the probability distribution of the discrimination angle, then the expected probability that the interference protection distance is equal to the static protection range of the 5G base station specifically includes:

[0125] Set interference protection distance d S If the probability distribution of the interference protection distance d is equal to the probability distribution of the discrimination angle α, then the interference protection distance d S Equal to static protection range The expected probability, i.e.:

[0126]

[0127] Where M is the number of distribution intervals of the discrimination angle, p da (α i Let α be the probability distribution of the discrimination angle α.

[0128] In this embodiment, the interference protection distance can be calculated by the probabilistic expectation of the static protection range of the 5G base station, which has low computational complexity and improves computational efficiency.

[0129] In other embodiments, the protection distance calculation module is also specifically used for:

[0130] The interference protection distance is calculated based on the interference exceedance duration, the probability distribution of the discrimination angle, and the static protection range corresponding to the interference protection distance.

[0131] As one implementation method, the interference protection distance is calculated based on the interference exceedance duration corresponding to the interference protection distance, the probability distribution of the discrimination angle, and the static protection range.

[0132] Set interference protection distance d S The expected probability of the percentage of time the interference exceeds the limit is p. th ,but:

[0133]

[0134] Where d is the discrimination angle α i Static protection range at that time To distinguish the angle α iThe percentage of interference exceeding the limit when the static protection range is d. The value of the interference protection range d obtained by solving the above formula is the interference protection distance d. S The value of d. In this embodiment, the interference protection distance d can be calculated by traversal or Newton's method. S The value of .

[0135] In this embodiment, the interference protection distance is calculated based on the interference exceeding the standard duration, the probability distribution of the identification angle, and the static protection range.

[0136] This embodiment is based on the dynamic scenario of a non-stationary orbit constellation. It conforms to the actual link pointing distribution from the perspective of probability expectation, thereby obtaining a reasonable interference protection distance, which is conducive to improving the utilization efficiency of space frequency resources.

[0137] In other embodiments, adjusting the current transmission power of the shipborne mobile communication device includes reducing the transmission power of the current shipborne mobile communication device.

[0138] In other implementations, adjusting the transmission power of the current shipborne mobile communication device includes turning off the transmission of the current shipborne mobile communication device.

[0139] In this embodiment, when the distance between the current shipborne mobile communication device and the 5G base station is less than the interference protection distance, the transmission power is reduced or turned off, which can protect the 5G system with priority.

[0140] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A method for protecting 5G base stations from interference caused by a non-stationary satellite-borne mobile communication system, characterized in that, Including the following steps: Obtain the probability distribution of the discrimination angle; the method for obtaining the discrimination angle includes: calculating it based on the shipborne mobile communication location, the 5G base station location, and the access satellite location; The interference protection distance of the 5G base station is calculated based on the probability distribution of the discrimination angle and the static protection range of the 5G base station. When the distance between the current shipborne mobile communication device and the 5G base station is less than the interference protection distance, adjust the transmission power of the current shipborne mobile communication device. The probability distribution for obtaining the discrimination angle specifically includes: Acquire multiple sets of historical time data, including multiple historical times and the shipborne mobile communication position and access satellite position corresponding to each historical time; The discrimination angle corresponding to each historical moment is calculated based on the multiple sets of historical moment data and the location of the 5G base station. Record the multiple historical moments and the discrimination angle corresponding to each historical moment, and calculate the probability distribution of the discrimination angle.

2. The method as described in claim 1, characterized in that, The method for obtaining the static protection range includes: calculating it based on the discrimination angle and the interference protection limit of the 5G base station.

3. The method as described in claim 1, characterized in that, The interference protection distance of the 5G base station, calculated based on the probability distribution of the discrimination angle and the static protection range of the 5G base station, includes: If the probability distribution of the interference protection distance is set to be equal to the probability distribution of the discrimination angle, then the probability expectation that the interference protection distance is equal to the static protection range of the 5G base station is obtained.

4. The method as described in claim 3, characterized in that, The probability distribution of the set interference protection distance is equal to the probability distribution of the discrimination angle, and the expected probability that the interference protection distance is equal to the static protection range of the 5G base station specifically includes: Set the interference protection distance The probability distribution is equal to the discrimination angle. The probability distribution of the interference protection distance is then... Equal to the static protection range The expected probability, i.e.: Where M is the number of distribution intervals of the discrimination angle. For the discrimination angle The probability distribution.

5. The method as described in claim 1, characterized in that, The interference protection distance of the 5G base station, calculated based on the probability distribution of the discrimination angle and the static protection range of the 5G base station, includes: The interference protection distance is calculated based on the interference exceedance duration corresponding to the interference protection distance, the probability distribution of the discrimination angle, and the static protection range.

6. The method as described in claim 5, characterized in that, The interference protection distance is calculated based on the interference exceedance duration corresponding to the interference protection distance, the probability distribution of the discrimination angle, and the static protection range. Set interference protection distance The expected probability of the corresponding percentage of interference exceeding the limit is: ,but: in, To distinguish the angle is Static protection range at that time To distinguish the angle is The static protection range is Percentage of time exceeding the interference limit; The interference protection distance To solve the formula using traversal or Newton's method Interference protection range The value of .

7. The method as described in claim 1, characterized in that, Adjusting the transmission power of the current shipborne mobile communication device includes reducing the transmission power of the current shipborne mobile communication device.

8. The method as described in claim 1, characterized in that, Adjusting the transmission power of the current shipborne mobile communication device includes turning off the transmission of the current shipborne mobile communication device.

9. A device for protecting 5G base stations from interference caused by a non-stationary satellite-borne mobile communication system, characterized in that, include: The probability distribution acquisition module is used to obtain the probability distribution of the discrimination angle; The method for obtaining the discrimination angle includes: calculating it based on the shipborne mobile communication position, the 5G base station position, and the access satellite position; The protection distance calculation module is used to calculate the interference protection distance of the 5G base station based on the probability distribution of the discrimination angle and the static protection range of the 5G base station. An adjustment module is used to adjust the transmission power of the current shipborne mobile communication device when the distance between the current mobile communication device and the 5G base station is less than the interference protection distance. The probability distribution acquisition module is specifically used for: Acquire multiple sets of historical time data, including multiple historical times and the shipborne mobile communication position and access satellite position corresponding to each historical time; The discrimination angle corresponding to each historical moment is calculated based on the multiple sets of historical moment data and the location of the 5G base station. Record the multiple historical moments and the discrimination angle corresponding to each historical moment, and calculate the probability distribution of the discrimination angle.

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