CN112601231B - 5G network deep coverage method under complex test environment - Google Patents
5G network deep coverage method under complex test environment Download PDFInfo
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Abstract
The application provides a 5G network deep coverage method under a complex test environment, which comprises the following steps: determining the position of a first-stage pRRU based on the edge of a full-aircraft fatigue strength test frame of the aircraft; determining a second-stage pRRU position adjacent to the first-stage pRRU and an Nth-stage pRRU position adjacent to the second-stage pRRU based on a dynamic programming algorithm until the pRRU signal covers an aircraft whole-airplane fatigue strength test frame; fine-tuning the N-level pRRU position according to the actual position of the whole aircraft fatigue strength test frame of the aircraft to obtain an pRRU initial position; performing signal simulation on each area of the whole airplane fatigue strength test frame according to the pRRU initial position based on a crystal rule to obtain a simulation result; if the preset signal value is reached, determining the final position of the pRRU; (ii) placing a pRRU according to the pRRU final position; the RHUB is arranged at a preset position in a whole airplane fatigue strength test frame, and all the pRRUs are connected with the RHUB.
Description
Technical Field
The invention relates to the field of communication, in particular to a 5G network deep coverage method in a complex test environment.
Background
The aircraft structural strength test is generally implemented in a laboratory, response data of the aircraft under various loads are obtained through technical means, and performances such as the strength of the aircraft are finally verified, so that the essence of the aviation strength test is discrete data production. The existing wired data transmission mode has long test preparation period, a large amount of labor is consumed in the construction preparation link of the environment, the 5G network can be adopted to realize the flexible construction of the test environment according to the requirements, and the digital transmission of the traditional test data is accelerated. The development targets of the aviation strength test are digitization, informatization and intellectualization, and meanwhile, in order to achieve flexible deployment of test equipment and facilities as required, the 5G wireless network is widely used for transmission of aviation strength test data, which puts higher data transmission and processing requirements on the aviation strength test.
In the current aviation strength test, particularly in the fatigue test, an airplane is fixed in a huge steel structure frame. The steelframe is inside the layering, can increase a lot of bearing structure and walking passageway between every layer, has many kinds of experimental facilities around the fuselage, and the material is various, and is very big to the decay system difference of electromagnetic wave. The aircraft fuselage mainly comprises composite material, and there can be a lot of fillers in the cabin to reduce the space, and these steel construction, experimental facilities, aircraft, filler all can have the decay effect to the electromagnetic wave, lead to 5G signal constantly to attenuate in the transmission, and signal quality and transmission rate show the aggravation trend along with base station antenna distance, shelter from the thing increase. In addition, in the aviation strength test, a large amount of test response data and test monitoring data (video monitoring, machine vision inspection, response sensors and the like) are generated from bottom to top, and the data are uploaded through an uplink data channel of a 5G network, so that higher uplink bandwidth and lower time delay are urgently needed. Due to the fact that downlink resources are far more than uplink resources in the existing 5G network system, bearing resources for uplink data are limited, meanwhile, the laboratory environment is complex, 5G signal transmission interference is large, and high-speed uplink transmission of test data is difficult.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for deeply covering a 5G network in a complex test environment, which can construct a set of 5G network with optimal network performance in the complex aviation test environment.
The application provides a 5G network deep coverage method under a complex test environment, which comprises the following steps:
determining the position of a first-stage pRRU on the basis of the edge of a full-aircraft fatigue strength test frame of the aircraft;
determining a second-level pRRU position adjacent to the first-level pRRU and an Nth-level pRRU position adjacent to the second-level pRRU based on a dynamic programming algorithm until the pRRU signal covers an airplane whole fatigue strength test frame;
fine-tuning the N-level pRRU position according to the actual position of the whole aircraft fatigue strength test frame of the aircraft to obtain an pRRU initial position;
performing signal simulation on each area of the whole airplane fatigue strength test frame according to the pRRU initial position based on a crystal rule to obtain a simulation result;
if the preset signal value is reached, determining the final position of the pRRU; if the position of the N-level pRRU does not reach the preset signal value, continuing to finely adjust the position of the N-level pRRU to obtain an initial position of the pRRU;
(ii) placing a pRRU according to the pRRU final position;
the RHUB is arranged at a preset position in a whole-aircraft fatigue strength test frame of the aircraft, all the pRRUs are connected with the RHUB, and the shorter the connection distance between the preset position and all the pRRUs is, the better the connection distance is.
Specifically, the number of the first-stage pRRUs is 1-10, and the number of the second-stage and Nth-stage pRRUs is in the range of 2-5.
Specifically, after obtaining the pRRU initial position, the method further comprises:
establishing a three-dimensional digital model of a test frame of the test airplane, marking all pRRU point positions on the three-dimensional digital model of the test frame according to the pRRU initial position, and ensuring that the shielding from any position of the whole airplane fatigue strength test frame to the nearest pRRU is not more than two layers through various visual angle operations;
in the test frame three-dimensional digital model, all pRRU point location coverage areas are obtained based on the pRRU point locations and the signal emission coverage areas of all pRRUs, and at least 80% of space positions of the whole aircraft fatigue strength test frame to the pRRUs are guaranteed to be direct-view paths.
Specifically, the structure of the full-airplane fatigue strength test frame of the airplane is an M-layer steel structure, and the M comprises 2-5 layers;
the overall size of the fatigue strength test frame of the whole airplane is larger than that of the tester;
the testing frame for the fatigue strength of the whole airplane comprises a front part, a middle part, a rear part, a left part and a right part, which respectively cover a nose, a front fuselage, a middle fuselage, a rear fuselage, an empennage, a left wing and a right wing of the testing machine, and a middle reserved space of the testing frame for the fatigue strength of the whole airplane is reserved for placing a testing airplane;
the main structure of the whole airplane fatigue strength test frame adopts H-shaped steel;
the front part, the middle part, the rear part, the left part and the right part are connected or welded into a truss structure through bolts, so that the overall strength and rigidity safety are ensured;
the pRRU is installed on frame H shaped steel, and the pRRU is arranged along H shaped steel with RHUB connecting cable.
Specifically, the simulation result includes a signal coverage, a signal strength, a network uploading rate, a network downloading rate, and a signal source interference strength.
Specifically, the crystal rule is that for an area with poor network signals and a high bit error rate and a terminal user, a decoding algorithm with 64 optimal paths up to the maximum is adopted, and the transmission rate of the terminal is improved.
Specifically, two pRRUs oppositely arranged are oppositely emitted at the wing root of the wing based on the plane symmetry plane; the other two pRRUs are oppositely arranged and are opposite emission.
Specifically, the pRRU has capacity expansion capability in a 4.9G frequency band.
Specifically, the preset position in the full-aircraft fatigue strength test frame of the airplane is obtained through calculation of an optimization algorithm.
In conclusion, the beneficial effects of the invention are as follows:
the method for deeply covering the 5G network in the complex environment of the strength test of the testing machine is provided for the first time, and a network foundation is provided for the flexible and required arrangement of laboratory facilities;
the problems of 5G network signal attenuation and the like in a complex test environment are solved, and safe, reliable and high-speed wireless transmission of large-scale test data can be realized;
the wireless high-speed transmission of large-scale data in a laboratory can be realized, and a technical basis is provided for real-time processing and remote monitoring of test data.
Drawings
FIG. 1 is an aeronautical strength laboratory 5G wireless network topology of the present invention;
FIG. 2 is a schematic diagram of an installation position of a pRRU in an aviation strength test site according to the present invention;
FIG. 3 is a detailed view of an aviation strength test site pRRU installation of the present invention;
FIG. 4 is a schematic illustration of an installation of the RHUB at an aerospace strength testing site of the present invention;
FIG. 5 is a schematic layout view of a test load-bearing steel structure network device according to the present invention;
fig. 6 is a schematic layout view of the experimental load-bearing steel structure network equipment of the invention.
Detailed Description
Example one
In order to solve the problem that a high-reliability and high-performance 5G wireless network for data transmission is constructed in an ultra-complex environment in an aircraft full-aircraft strength test, a 5G network deep coverage method in a complex test environment is provided, network deep coverage of multiple terminals, multiple radio frequency transmitting and receiving sources and low interference is met under the condition of multiple shelters in the complex test environment, and a 5G wireless network topological graph in an aviation strength laboratory is shown in a figure 1. The method is mainly realized by the following technical scheme:
1. experimental site pRRU (miniature radio remote unit) three-dimensional redundant coverage arrangement. The number of base station signal sources in the effective coverage range of each terminal signal is increased, so that independent transmission channels are increased, and channel redundancy is formed in a hot backup mode. When some channels are blocked and cannot work, enough channels can be used for replacing transmission. The reliability of the speed which can be perceived by the terminal depends on the degree of the channel hot backup, and when the number of the channel hot backups is large, the service availability is higher under the same shielding condition.
In a fatigue test site, the testing machine is positioned in the bearing frame, the testing machine can be regarded as a sealing cylinder and a cantilever wing, the bearing frame surrounds the outside of the testing machine, and is divided into 7 layers in total, and the bearing frame is of a bilaterally symmetrical structure and is made of A3 steel. The pRRU and the external antenna are installed on a bearing frame, the RHUB (radio frequency module concentrator) is installed in a cabinet on the bearing frame, and the BBU (baseband module) is installed in a machine room.
A total of 36 prrus were placed throughout the test support frame. 16 pRRUs are distributed at the rear end of the frame and distributed in four layers of the frame in a bilateral symmetry mode, and are numbered 1-8. 6 pRRUs are distributed in the middle area of the frame, distributed on the bottom strut and the top layer of the frame, and distributed symmetrically left and right, and numbered 9, 17 and 18. The front end area of the frame is provided with 14 pRRUs which are distributed in four layers of the frame, are distributed symmetrically and are numbered 10-16. The pRRU global distribution profile is shown in FIGS. 2-4.
In the left tail region of the frame, no. 1 pRRU is arranged on layer 6, near the rear end of the tail region. And a No. 2 pRRU is arranged on the 5 th layer and is close to the front end of the tail area. And 3, 4 pRRUs are arranged on the 4 th layer, and the distance between the pRRUs is 9 meters. And No. 5 and No. 6 pRRU are arranged on the 3 rd layer, and the distance between the pRRU and the pRRU is 9 meters. And the No. 7 and No. 8 pRRU are arranged on the layer 2, and the distance between the two pRRUs is 9 meters. And the right side is symmetrically distributed.
In the middle region on the left side of the frame, layer 5 is arranged pRRU No. 9 near the front end of the middle region. Layer 4 was disposed 17 pRRU, disposed in the middle of the middle region. Layer 2 was laid out with a # 18 pRRU mounted on the bottom struts. And the right side is symmetrically distributed.
In the front area on the left side of the frame, layer 5 was placed pRRU No. 10, placed in the middle of the front area. And the No. 4 pRRU is arranged in the positions of 11 and 12, and the distance between the two is 7 meters. And the No. 3 pRRU 13 and the No. 14 pRRU are arranged on the layer 3, and the distance between the two pRRUs is 7 meters. Layer 2 was provided with a pRRU number 15, 16, spaced 9 meters apart. And the right side is symmetrically distributed.
2. The interference is reduced in a directional and accurate mode. The radio frequency emission angle of a base station signal source is limited, useless signals are greatly reduced, meanwhile, the signal power is concentrated in the area where the aviation strength test service terminal is located, and the signal-to-noise ratio of a hot spot area can be improved. The whole test bearing frame is divided into four layers, and the layers are separated by a steel floor.
Each layer of pRRU is distributed from the head part to the tail part of the frame according to a plan, 60-degree antennas are installed on the pRRU as signal propagation angles of the directional antennas, the directional antennas are installed on the left frame and the right frame, the antennas on the two sides are horizontally and symmetrically installed, the radiation range of the emission angles along the horizontal direction is 60 degrees, and the specific installation positions and the radiation range are shown in figures 5-6.
Taking a full-aircraft fatigue strength test of a certain large civil aircraft as an example, the specific implementation mode is as follows:
1. the network consists of the following parts: the system comprises a 5G terminal, a 5G base station, a 5G bearing network and a 5G core network. The network hot spot area of the project is an airplane bearing frame and an airplane cabin interior, and the wireless network topology of the project is shown in figure 1.
2. And increasing the number of base station signal sources in the effective coverage range of each terminal signal, and realizing three-dimensional redundant coverage. Taking a fatigue test of a certain type as an example, in order to provide sufficient redundant coverage of channels for more than 95% of test points, the distance between the traditional base stations is reduced from 30 meters to 50 meters to 2 meters to 8 meters, and the number of independent channels in space is increased from 1 to 4 to 8 within the effective coverage range of a terminal signal. The schematic layout of the test bearing steel structure network equipment is shown in figures 2 and 3.
3. And the radio frequency emission angle of a base station signal source is limited, useless signals are greatly reduced, and meanwhile, the signal power is concentrated in the area where the aviation strength test service terminal is located. The laboratory selects a 60 ° antenna as the signal propagation angle of the directional antenna. In the networking plan of the experimental environment, the signal strength transmitted to the peripheral cells by the 60 ° directional antenna can be reduced by more than 20dB (compared with the omni-directional antenna). After the interference is reduced by 20dB, the signal-to-noise ratio of the peripheral cells/terminals can be ensured to reach more than 20 dB.
Therefore, the method for deep coverage of the 5G network in the complex test environment is provided in the full-aircraft strength test, the 5G network with the optimal network performance in the complex aviation test environment is constructed, the high-reliability and high-performance wireless network service is provided for the aviation strength laboratory, the purpose of safe, reliable and high-speed transmission of large-scale test data in the full-aircraft strength test of the aircraft is achieved, and a network foundation is constructed for the intelligent aviation laboratory.
Example two
S101: determining the position of a first-stage pRRU based on the edge of a full-aircraft fatigue strength test frame of the aircraft;
the number of first stage pRRUs includes 1-10;
in practical application, the pRRU reserves the upgrade capacity expansion capacity of the 4.9G frequency band.
S102: determining the Nth-level pRRU position adjacent to the first-level pRRU and the second-level pRRU based on a dynamic programming algorithm until the pRRU signal covers all airplane whole fatigue strength test frames;
note that the second-to nth-stage prrus are all peripheral to the upper-stage pRRU.
The dynamic programming algorithm is to process the layout of all pRRUs on the frame into hierarchical layout sub-problems, i.e., to decompose the layout problem into a plurality of sub-problems (hierarchical layout), and solve the sub-problems in sequence, and the solution of the former sub-problem provides useful information for the solution of the latter sub-problem. When any sub-problem is solved, various possible local solutions are listed, the local solution which is possibly optimal is kept through decision, and other local solutions are discarded. The sub-problems are solved in sequence, and finally the problems can be solved.
It should be noted that the pRRU initial position can ensure:
(1) And the shielding from any position of the whole airplane fatigue strength test frame to the nearest pRRU does not exceed N layers. The N comprises 1-2.
(2) And all the pRRUs from m% of the fatigue strength test frame of the whole airplane are direct-view diameters.
The m% comprises 80% -100%.
It should be noted that the number of the second-stage pRRU ranges from 2 to 5, for example, pRRU No. one, pRRU No. two, pRRU No. three, and pRRU No. four.
The number of adjacent prrus around the pRRU No. zero is specifically: 3, pRRU No. one, pRRU No. two, and pRRU No. three.
S103: fine-tuning the N-level pRRU position according to the actual position of the whole aircraft fatigue strength test frame of the aircraft to obtain an pRRU initial position;
the structure of the testing frame of the fatigue strength of the whole airplane is as follows: the overall size of the tester is larger than that of the tester, the tester can be divided into five parts, namely a front part, a middle part, a rear part, a left part and a right part, which respectively cover a nose and a front fuselage of the tester, the middle fuselage, the rear fuselage and an empennage, the left wing and the right wing, and a reserved space in the middle of a frame is used for placing a test airplane. The frame main structure all adopts H shaped steel, and each region passes through bolted connection or welding, ensures that bulk strength and rigidity safety. And each layer of the framework is provided with a corridor for the construction and detection of technicians, the pRRU is arranged on the H-shaped steel of the framework, and the pRRU and RHUB connecting cables are arranged along the H-shaped steel.
N comprises 2-5 layers.
S104: performing signal simulation on each area of the whole airplane fatigue strength test frame according to the pRRU initial position based on a crystal rule to obtain a simulation result;
the crystal rule is that for the area with poor network signals and high error rate and the terminal user, a decoding algorithm with 64 optimal paths is adopted, the transmission rate of the terminal is improved, the dead angle in network coverage is eliminated, and the signal coverage is clear and transparent like crystal. Specifically, the three-dimensional networking design of the strength test area is used for carrying out joint decoding processing on transmission paths from a terminal to a plurality of PRRUs on the premise that the plurality of PRRUs provide coverage capability aiming at a terminal user, so that key network indexes are ensured to meet the service requirements.
The simulation result comprises signal coverage, signal strength, network uploading rate, network downloading rate and signal source interference strength.
S105: if the preset signal value is reached, determining the final position of the pRRU; if the position of the N-level pRRU does not reach the preset signal value, continuing to finely adjust the position of the N-level pRRU to obtain an initial position of the pRRU;
s106: (iii) placing the pRRU according to the pRRU final position.
Two pRRUs are oppositely arranged at the wing root of the wing based on the plane of symmetry of the airplane and are oppositely emitted. The remaining two prrus, oppositely disposed, are relative emissions.
The relative emission is: on a test frame, pRRU transmitting antennas which are symmetrically arranged left and right point to each other, and transmitting signals are converged between the two pRRUs.
The opposite emission is: on the test frame, pRRU transmitting antennas symmetrically arranged on the left and right sides are back to the opposite direction, and transmitting signals cannot be converged.
S107: the RHUB is arranged at a preset position in a whole-airplane fatigue strength test frame, the shorter the connection distance between the RHUB and all the pRRUs is, the better the connection distance is, and the RHUB is calculated through an optimization algorithm. All prrus were linked to RHUB.
The optimization algorithm is as follows: the reserved locations where RHUB can be placed are listed. And aiming at each reserved position, cables are arranged at all pRRU point positions along the H-shaped steel of the test frame, and are finally connected with the RHUB, and the connection lengths of all the cables are used as optimization targets. And optimizing the target function by adopting a least square method to finally obtain one reserved position, wherein all pRRU point positions are connected with the RHUB at the position along the test frame H-shaped steel arrangement cable, and the cable is shortest.
In summary, the present application provides a method for deep coverage of a 5G network in a complex test environment, which aims at the problems of attenuation, interference, and the like of the 5G network in the complex test environment, and according to a result of 5G network coverage simulation, methods such as pRRU (miniature radio remote unit) three-dimensional redundant coverage arrangement, directional accurate interference reduction, network optimization combined networking, and the like are adopted to provide sufficient channel redundant coverage for more than 95% of test points, complete massive data upload services, and simultaneously reduce the problem of signal interference, thereby implementing 5G network construction with optimal network performance in the complex aviation test environment, and ensuring that service data can be uploaded in real time, efficiently, and reliably.
Claims (9)
1. A method for deep coverage of a 5G network in a complex test environment is characterized by comprising the following steps:
determining the position of a first-stage pRRU based on the edge of a full-aircraft fatigue strength test frame of the aircraft;
determining a second-stage pRRU position adjacent to the first-stage pRRU and an Nth-stage pRRU position adjacent to the second-stage pRRU based on a dynamic programming algorithm until the pRRU signal covers an aircraft whole-airplane fatigue strength test frame;
fine-tuning the position of the N-level pRRU according to the actual position of the fatigue strength test frame of the whole airplane to obtain the initial position of the pRRU;
performing signal simulation on each area of the whole airplane fatigue strength test frame according to the pRRU initial position based on a crystal rule to obtain a simulation result;
if the preset signal value is reached, determining the final position of the pRRU; if the position of the N stages of pRRU does not reach the preset signal value, continuing to finely adjust the position of the N stages of pRRU to obtain an initial position of the pRRU;
(ii) placing a pRRU according to the pRRU final position;
the RHUB is arranged at a preset position in a whole airplane fatigue strength test frame, all the pRRUs are connected with the RHUB, and the connection distance between the preset position and all the pRRUs is as short as possible.
2. The method of claim 1, wherein the first stage pRRU is in a number range from 1 to 10, and the second and nth stages pRRU are in a number range from 2 to 5.
3. The method of claim 1, wherein after obtaining the pRRU initial position, the method further comprises:
establishing a test frame three-dimensional digital model of the test airplane, marking all pRRU point positions on the test frame three-dimensional digital model according to the pRRU initial position, and ensuring that the shielding from any position of the whole airplane fatigue strength test frame to the nearest pRRU is not more than two layers through various visual angle operations;
in the test frame three-dimensional digital model, all pRRU point location coverage ranges are obtained based on pRRU point locations and signal emission coverage ranges of all pRRUs, and at least 80% of spatial positions of the test frame of the whole airplane fatigue strength to the pRRU are guaranteed to be direct-view paths.
4. The method of claim 1, wherein the structure of the aircraft full-aircraft fatigue strength test frame is an M-layer steel structure, wherein M comprises 2-5 layers;
the overall size of the whole aircraft fatigue strength test frame is larger than that of the testing machine;
the testing frame for the fatigue strength of the whole airplane comprises a front part, a middle part, a rear part, a left part and a right part, which respectively cover a nose, a front fuselage, a middle fuselage, a rear fuselage, an empennage, a left wing and a right wing of the testing machine, and a testing airplane is placed in a reserved space in the middle of the testing frame for the fatigue strength of the whole airplane;
the main structure of the full-airplane fatigue strength test frame of the airplane adopts H-shaped steel;
the front part, the middle part, the rear part, the left part and the right part are connected or welded into a truss structure through bolts, so that the overall strength and rigidity safety are ensured;
the pRRU is installed on frame H shaped steel, and the pRRU is arranged along H shaped steel with the RHUB connecting cable.
5. The method of claim 1, wherein the simulation results comprise signal coverage, signal strength, network upload rate, network download rate, and signal source interference strength.
6. The method of claim 1, wherein the crystal rule adopts up to 64 optimal path decoding algorithms to increase the transmission rate of the terminal.
7. The method of claim 1, wherein two prrus disposed opposite each other at the wing root are oppositely fired based on the plane of symmetry of the aircraft; the other two pRRUs are oppositely arranged and are opposite emission.
8. The method of claim 1, wherein the pRRU has 4.9G band expansion capability.
9. The method of claim 1, wherein the predetermined position in the full aircraft fatigue strength test frame is calculated by an optimization algorithm.
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