CN114629579A - Method for simulating radio wave communication in building by computer - Google Patents
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- CN114629579A CN114629579A CN202210115894.3A CN202210115894A CN114629579A CN 114629579 A CN114629579 A CN 114629579A CN 202210115894 A CN202210115894 A CN 202210115894A CN 114629579 A CN114629579 A CN 114629579A
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- 238000004891 communication Methods 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 48
- 230000035515 penetration Effects 0.000 claims abstract description 36
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 238000004364 calculation method Methods 0.000 claims description 20
- 238000005094 computer simulation Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- 239000011150 reinforced concrete Substances 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/408—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency the transmitter oscillator frequency being identical to the receiver local oscillator frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/33—Services specially adapted for particular environments, situations or purposes for indoor environments, e.g. buildings
Abstract
The embodiment of the invention discloses a method for simulating radio wave communication in a building by a computer, which comprises the following steps: s0, loading a three-dimensional digital map; s1, setting the positions of a communication transmitter and a receiver on the three-dimensional digital map; s2, setting the working frequency of the communication equipment used by the communication transmitter and the receiver; s3, calculating the communication distance between the communication transmitter and the receiver on the three-dimensional digital map; s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map; s5, judging whether the position of the communication transmitter or the receiver is in the building according to the three-dimensional digital map and the terrain elevation profile; s6, testing the building penetration loss A (n); s7, calculating the free space transmission loss of radio waves; s8, calculating the radio wave transmission loss according to the building penetration loss A (n) and the radio wave free space transmission loss; s9, performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication.
Description
Technical Field
The invention relates to a communication test method of a command system, in particular to a method for simulating radio wave communication in a building by a computer.
Background
In the existing situation of communication test of a command system, communication professionals carry communication equipment to carry out the communication test at a specified communication test site, and special tests can be continued according to the terrain conditions of the test site and the information of the communication equipment. However, since the terrain conditions of the test site are very complex and dangerous, the special test mode which needs to be examined by communication personnel on the spot is very dangerous, which wastes manpower and material resources and increases the test cost.
How to ensure the life safety of communication personnel, efficiently and quickly complete special tests, save cost and reduce the consumption of manpower and material resources, and in order to solve one or more of the problems, a method for simulating radio wave communication in a building by a computer is needed.
Disclosure of Invention
The invention aims to provide a method for simulating radio wave communication in a building by a computer, which aims to solve the problems that the communication test of a command system in the prior art cannot ensure the life safety of communication personnel, the virtual simulation cannot be carried out on site, the manpower and material resources are wasted, and the test cost is increased.
A second object of the present invention is to provide an apparatus for computer simulation of radio wave communication within a building.
In order to achieve at least one of the above purposes, the invention adopts the following technical scheme:
a first aspect of the invention provides a method of computer simulation of radio wave communication within a building, the method comprising the steps of:
s0, loading a three-dimensional digital map;
s1, setting the positions of a communication transmitter and a receiver on the three-dimensional digital map;
s2, setting the working frequency of the communication equipment used by the communication transmitter and the receiver, wherein the working frequency of the communication equipment used by the communication transmitter is the same as that of the communication equipment used by the receiver;
s3, calculating the communication distance between the communication transmitter and the receiver on the three-dimensional digital map;
s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
s5, judging whether the position of the communication transmitter or the receiver is in the building according to the three-dimensional digital map and the terrain elevation profile;
s6, testing the penetration loss A (n) of the building,
the step S6 specifically includes the following steps:
s61: introducing a parameter n for characterizing the radio waves passing through the floors of the building;
s62: building a relation between the building penetration loss and the floor under different parameters n;
s63: calculating the building penetration loss A (n) according to the relation between the building penetration loss and the floor:
A(n)＝13-2n；
s7, calculating the free space transmission loss of radio waves;
s8, calculating the radio wave transmission loss according to the building penetration loss A (n) and the radio wave free space transmission loss;
s9, performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication.
In a specific embodiment, the terrain elevation profile is generated by identifying the three-dimensional digital map by a computer or manually inputting information according to the three-dimensional digital map.
In a specific embodiment, the terrain elevation profile and the three-dimensional digital map comprise terrain information, landform information, building information, altitude information and distance information.
In a specific embodiment, the step S7 specifically includes the following steps:
calculating the radio wave free space transmission loss Lbf，Lbf＝32.45+20lgf(MHz)+20lgd(km)(db)；
Wherein L isbfFor the radio wave free space transmission loss, d is the distance from the transmitter to the receiver, and f is the operating frequency of the communication device.
In one embodiment, the step S8 calculates the radio wave transmission loss Lb，Lb＝Lbf+A(n)；
Wherein the radio wave transmission loss Lb(ii) a Radio wave free space transmission loss Lbf(ii) a Building penetration loss a (n).
A second aspect of the present invention provides an apparatus for computer simulation of radio wave communication within a building, the apparatus comprising:
the loading module is used for loading the three-dimensional digital map;
the setting module is used for setting the positions of a communication transmitter and a receiver on the three-dimensional digital map and setting the working frequency of communication equipment used by the communication transmitter and the receiver;
a communication distance calculation module for calculating a communication distance between the communication transmitter and the receiver on the three-dimensional digital map;
a terrain elevation profile module for forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
the terrain judging module is used for judging whether the position of the communication transmitter or the receiver is in a building or not according to the three-dimensional digital map;
the building penetration loss calculation module is used for calculating the building penetration loss A (n);
the free space transmission loss calculation module is used for calculating the free space transmission loss of radio waves;
the radio wave transmission loss calculation module is used for calculating the radio wave transmission loss according to the building penetration loss and the free space transmission loss;
an analog communication module for performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein; the building penetration loss calculation module further comprises:
the building corresponding relation unit is used for building a building penetration loss-floor relation;
and the computing unit is used for computing the building penetration loss.
A third aspect of the invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method as set forth in the first aspect of the invention.
A fourth aspect of the invention is a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method as described in the first aspect of the invention when executing the program.
The beneficial effect of this application is as follows:
the invention adopts the method of simulating the radio wave communication in the building by the computer, simulates the test of carrying out the radio wave communication in the reinforced concrete frame building in the suburb of the big city, replaces the special test carried by communication professionals with communication equipment at the appointed communication test site, and effectively ensures the life safety of the communication personnel. The invention can efficiently and quickly complete the integration and calculation of the collected information of the special test, save the cost of the communication test and reduce the consumption of manpower and material resources.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a flow diagram of a method for computer simulation of radio wave communication within a building in accordance with one embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is further noted that, in the description of the present application, 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 such entities or actions. Also, the terms "comprises," "comprising," 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 may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
To solve the problems in the prior art, an embodiment of the present invention provides a method for computer simulation of radio wave communication in a building, as shown in fig. 1, including:
s0, loading a three-dimensional digital map;
the three-dimensional digital map includes topographic information, relief information, building information, altitude information, distance information, and the like.
The three-dimensional digital map can select Baidu, Gaode, Google or other three-dimensional digital map data packets downloaded from the network and containing the specific information.
S1, setting the communication transmitter and receiver positions on the three-dimensional digital map,
the user drags an icon from an icon bar through a mouse to add a communication transmitter and receiver model, or the communication transmitter and the receiver are defined directly on a three-dimensional digital map through mouse selection points, and communication personnel are simulated to arrive at positions for field investigation and communication test.
S2, setting the working frequency of the communication equipment used by the communication transmitter and the receiver; the communication transmitter uses communication equipment working frequency which is the same as that of the communication equipment of the receiver;
when the mouse clicks the communication transmitter and the receiver, a setting frame can be popped up, the working frequency of the used communication equipment is respectively set in the setting frame, and the communication personnel can be simulated to use the communication equipment on the spot to adjust the working frequency of the communication equipment.
And S3, calculating the communication distance between the communication transmitter and the receiver on the three-dimensional digital map.
S4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map; the topographic elevation profile may be formed by automatically identifying the topographic profile by a computer, or may be manually drawn by a computer on a three-dimensional digital map (e.g., by setting up an elevation profiling system using the GUI function of MATLAB to extract the topographic elevation profile between any two points on the earth, etc.). The terrain elevation profile map comprises terrain information, landform information, building information, altitude information and distance information.
And S5, judging whether the position of the communication transmitter or the receiver is in a building according to the three-dimensional digital map and the terrain elevation profile, wherein the building is a reinforced concrete frame building in a suburban area.
S6, testing the building penetration loss A (n);
wherein the building penetration loss a (n) is formed by the building through which the radio waves transmitted by the communication device transmitting station pass;
step S6 specifically includes the following steps:
s61: a parameter n, n is introduced for characterizing the floor of the building through which the radio waves pass.
S62: building a relation between the building penetration loss and the floor under different parameters n;
s63: calculating the building penetration loss A (n) according to the relation between the building penetration loss and the floor: a (n) ═ 13-2 n.
S7, calculating the free space transmission loss of radio waves;
the calculation formula is Lbf＝32.45+20lgf(MHz)+20lgd(km)(db)，
Wherein L isbfThe free space transmission loss of radio waves, d is the distance from the transmitter to the receiver, and f is the operating frequency of the communication device.
S8, calculating radio wave transmission loss;
the calculation formula is Lb＝Lbf+A(n)；
Wherein, radio wave transmission loss Lb(ii) a Radio wave free space transmission loss Lbf(ii) a Building penetration loss a (n).
Through the steps of S6-S8, the radio wave transmission loss is determined efficiently and quickly, and the communication personnel can simulate the theoretical radio wave transmission loss at the test site indoors without performing a test on the spot. Personnel injury caused by dangerous places, dangerous weather or sudden disasters is reduced, and cost consumption is reduced.
And S9, serially entering the radio wave transmission loss obtained after the steps S0-S8 into the communication sending station and the communication receiving station as an attenuation value to carry out a communication test.
The method for performing radio wave communication in the building by adopting computer simulation can realize the simulation of the radio wave communication in a VHF frequency band (a very high frequency band of 30MHz-300 MHz); and can simulate radio wave communication in UHF frequency band (ultrahigh frequency 300MHz-3000 MHz). The universality of the frequency band is realized.
The technical scheme formed by the aid of the communication devices S0-S9 jointly adopts a method of simulating radio wave communication in a building by a computer, replaces an experiment mode that communication professionals carry communication equipment to carry out special tests at specified communication test places, and effectively guarantees life safety of the communication professionals. The invention can efficiently and quickly complete the integration and calculation of the collected information of the special test, save the cost of the communication test and reduce the consumption of manpower and material resources.
The invention also discloses a device for simulating radio wave communication in a building by a computer, which comprises:
the loading module is used for loading the three-dimensional digital map; the three-dimensional digital map can select Baidu, Gaode, Google or other three-dimensional digital map data packets downloaded from the network and containing the specific information.
The setting module is used for setting the positions of the communication transmitter and the receiver on the three-dimensional digital map and setting the working frequency of communication equipment used by the communication transmitter and the receiver;
the communication distance calculation module is used for calculating the communication distance between the communication transmitter and the receiver on the three-dimensional digital map;
and the terrain elevation profile module is used for forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map. The topographic elevation profile may be formed by automatically identifying the topographic profile by a computer, or may be manually drawn by a computer on a three-dimensional digital map (e.g., by setting up an elevation profiling system using the GUI function of MATLAB to extract the topographic elevation profile between any two points on the earth, etc.). The terrain elevation profile map comprises terrain information, landform information, building information, altitude information and distance information.
The terrain judging module is used for judging whether the position of the communication transmitter or the receiver is in a building or not according to the three-dimensional digital map; the building is a reinforced concrete frame building in a suburb of a big city.
The building penetration loss calculation module is used for calculating the building penetration loss A (n);
the free space transmission loss calculation module is used for calculating the free space transmission loss of radio waves;
the radio wave transmission loss calculation module is used for calculating the radio wave transmission loss according to the building penetration loss and the free space transmission loss;
an analog communication module for performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein; the building through loss calculation module further includes:
the building corresponding relation unit is used for building a building penetration loss-floor relation;
and the computing unit is used for computing the building penetration loss.
By using the device, an experiment mode that communication professionals need to carry communication equipment to carry out special tests at specified communication test places is replaced, and the life safety of the communication personnel is effectively ensured. The invention can efficiently and quickly complete the integration and calculation of the collected information of the special test, save the cost of the communication test and reduce the consumption of manpower and material resources.
Another embodiment of the invention provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to the first embodiment of the invention.
In practice, the computer-readable storage medium may take any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present embodiment, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
As shown in fig. 2, another embodiment of the present invention provides a schematic structural diagram of a computer device. The computer device 12 shown in FIG. 2 is only one example and should not be taken to limit the scope of use and functionality of embodiments of the present invention.
As shown in FIG. 2, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. Computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 2 and commonly referred to as a "hard drive"). Although not shown in FIG. 2, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
The processor unit 16 executes programs stored in the system memory 28 to perform various functional applications and data processing, such as implementing a method for computer simulation of radio wave communication in irregular terrain as provided by embodiments of the present invention.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (8)
1. A method for computer simulation of radio wave communication within a building, the method comprising the steps of:
s0, loading a three-dimensional digital map;
s1, setting the positions of a communication transmitter and a receiver on the three-dimensional digital map;
s2, setting the working frequency of the communication equipment used by the communication transmitter and the receiver, wherein the working frequency of the communication equipment used by the communication transmitter is the same as that of the communication equipment used by the receiver;
s3, calculating the communication distance between the communication transmitter and the receiver on the three-dimensional digital map;
s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
s5, judging whether the position of the communication transmitter or the receiver is in the building according to the three-dimensional digital map and the terrain elevation profile;
s6, testing the penetration loss A (n) of the building,
the step S6 specifically includes the following steps:
s61: introducing a parameter n for characterizing the radio waves passing through the floors of the building;
s62: building a relation between the building penetration loss and the floor under different parameters n;
s63: calculating the building penetration loss A (n) according to the relation between the building penetration loss and the floor:
A(n)＝13-2n；
s7, calculating the free space transmission loss of radio waves;
s8, calculating the radio wave transmission loss according to the building penetration loss A (n) and the radio wave free space transmission loss;
s9, performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication.
2. The method of claim 1, wherein the terrain elevation profile is generated by computer recognition of the three-dimensional digital map or by manual information entry from the three-dimensional digital map.
3. The method of claim 1, wherein the terrain elevation profile and the three-dimensional digital map comprise terrain information, building information, altitude information, and distance information.
4. The method according to claim 1, wherein the step S7 specifically comprises the steps of:
calculating the radio wave free space transmission loss Lbf，Lbf＝32.45+20lgf(MHz)+20lgd(km)(db)；
Wherein L isbfFor the radio wave free space transmission loss, d is the distance from the transmitter to the receiver, and f is the operating frequency of the communication device.
5. The method according to claim 1, wherein the step S8 calculates the radio wave transmission loss Lb，Lb＝Lbf+A(n)；
Wherein the radio wave transmission loss Lb(ii) a Radio wave free space transmission loss Lbf(ii) a Building penetration loss a (n).
6. An apparatus for computer simulation of radio wave communication within a building, the apparatus comprising:
the loading module is used for loading the three-dimensional digital map;
the setting module is used for setting the positions of a communication transmitter and a receiver on the three-dimensional digital map and setting the working frequency of communication equipment used by the communication transmitter and the receiver;
a communication distance calculation module for calculating a communication distance between the communication transmitter and the receiver on the three-dimensional digital map;
a terrain elevation profile module for forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
the terrain judging module is used for judging whether the position of the communication transmitter or the receiver is in a building or not according to the three-dimensional digital map;
the building penetration loss calculation module is used for calculating the building penetration loss A (n);
the free space transmission loss calculation module is used for calculating the free space transmission loss of radio waves;
the radio wave transmission loss calculation module is used for calculating the radio wave transmission loss according to the building penetration loss and the free space transmission loss;
an analog communication module for performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein; the building through loss calculation module further comprises:
the corresponding relation building unit is used for building a relation between the building penetration loss and the floor;
and the computing unit is used for computing the building penetration loss.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-5.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-5 when executing the program.
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