Communication coverage method based on RIS wireless network

Abstract

The invention discloses a communication coverage method based on an RIS wireless network, and belongs to the technical field of intranet coverage based on the RIS wireless network. Comprising directional receiving signals and any-angle transmitting signals; wherein the directional receiving signal comprises a wireless signal of an adjusted RIS phased array receiving signal source, and directional receiving is achieved; the step of transmitting the signal at any angle comprises the step of transmitting the received signal at any angle through the adjusted RIS phased array, and changing the transmission path of the signal. The RIS (reconfigurable intelligent surface) is utilized to change a transmission path and is applied to urban and mountainous area communication coverage, and the problem of unsmooth urban and mountainous area communication is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of intranet coverage based on RIS wireless network, and more specifically to a communication coverage method based on RIS wireless network. Background Art

[0002] There are many obstacles in urban areas that lead to poor communication. In remote mountainous areas, the communication link establishment is also affected by the obstruction of mountains.

[0003] Phased array RIS, as the most advanced antenna technology, has been very maturely applied in the military field. Its unique phase control capability makes it the representative of antennas. For example, shield ships, early warning aircraft, early warning radars, etc. are all based on phased array applications. With the maturity and high efficiency of phased array application technology, it is gradually expanding to the civilian field. This technology is based on the theory of interface electromagnetics to form a low-cost, low-power, miniaturized, TR-free, chip-free, domestically produced new RIS phased array antenna, and highly integrated control and communication modules to form a complete phased array communication system; the system has unique characteristics such as high mobility, high precision, ultra-long distance, full automation, and second link establishment.

[0004] RIS technology is different from traditional ultra-large-scale MIMO wireless communication systems. RIS can directionally reflect, refract or transmit incident electromagnetic waves in real time without relying on the surrounding environment, thereby achieving stronger coverage capabilities.

[0005] Therefore, how to use RIS (Reconfigurable Intelligent Surface) to change the transmission path and apply it to communication coverage in urban mountainous areas is a problem that technicians in this field need to solve urgently. Summary of the invention

[0006] In view of this, the present invention provides a communication coverage method based on RIS wireless network, which can make full use of the characteristics of RIS in the signal blind area in the mountainous area, change the direction of the transmission path, bypass the signal blocking by the mountainous area, and finally cover the user base station to complete the link communication in the blind area.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A communication coverage method based on RIS wireless network, including directional reception of signals and transmission of signals at any angle;

[0009] The directional reception of signals includes: determining the position and direction of a signal source; adjusting the phase of each unit in the RIS phased array according to the direction of the signal source so that the antenna array forms a high-gain receiving beam in a specific direction; receiving the wireless signal of the signal source through the adjusted RIS phased array to achieve directional reception;

[0010] The arbitrary angle signal transmission includes: determining the target position and direction to be covered; adjusting the phase of each unit in the RIS phased array according to the direction of the target position, so that the antenna array forms a high-gain transmission beam in a specific direction; and transmitting the received signal at an arbitrary angle through the adjusted RIS phased array to change the signal transmission path.

[0011] Further, determining the position and direction of the signal source includes:

[0012] Use base stations to scan the area and collect signal strength and delay information from different directions;

[0013] Analyze the multipath components in the received signal and estimate the azimuth and elevation of the signal source based on the geometric position relationship;

[0014] In an area where there are multiple reference points, the specific coordinates of the signal source are located through triangulation.

[0015] Furthermore, adjusting the phase of each unit in the RIS phased array according to the direction of the signal source so that the antenna array forms a high-gain receiving beam in a specific direction includes:

[0016] According to the direction parameters of the signal source and the relative positions between the RIS units, the phase difference that needs to be set for each RIS unit is calculated;

[0017] quantize the continuous phase differences into binary values ​​and generate corresponding binary sequences;

[0018] The working state of each RIS unit is controlled based on the binary sequence, and the signal is reflected according to a predetermined rule, so as to form a focused receiving beam in a specific direction.

[0019] Furthermore, the expression for calculating the phase difference that needs to be set for each RIS unit is:

[0020]

[0021] Where k is the wave number, k = 2π / δ, δ is the wavelength, d n is the distance from the nth RIS unit to the reference point, θ is the direction parameter of the signal source.

[0022] Furthermore, the determining of the target position and direction to be covered includes:

[0023] Set up receiving points at multiple different locations and simultaneously record the arrival time of the receiving beam from the same signal source;

[0024] Compare the time differences of the receiving beams at each receiving point;

[0025] Based on the time difference and the location information of the receiving point, the location of the signal source is calculated.

[0026] Furthermore, adjusting the phase of each unit in the RIS phased array according to the direction of the target position so that the antenna array forms a high-gain transmission beam in a specific direction includes:

[0027] According to the target position and direction and the relative positions between the RIS units, the phase difference that needs to be set for each RIS unit is calculated;

[0028] quantize the continuous phase differences into binary values ​​and generate corresponding binary sequences;

[0029] The working state of each RIS unit is controlled based on the binary sequence to form a high-gain transmission beam in a specified direction.

[0030] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a communication coverage method based on a RIS wireless network. The RIS phased array can receive the signal network with a high-gain directional beam in a wide range, and then transmit it in any direction, thereby changing the propagation path of the signal, thereby effectively avoiding the situation where communication cannot be carried out due to obstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 A diagram showing the effect of implementing RIS provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a RIS implementation method provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the characteristics of RIS provided by an embodiment of the present invention;

[0035] Figure 4 A connection diagram for use of RIS provided in an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of a RIS city coverage application provided by an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of RIS mountain coverage application provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The embodiment of the present invention discloses a communication coverage method based on a RIS wireless network, including directional reception of signals and transmission of signals at any angle;

[0040] The directional reception of signals includes: determining the position and direction of a signal source; adjusting the phase of each unit in the RIS phased array according to the direction of the signal source so that the antenna array forms a high-gain receiving beam in a specific direction; receiving the wireless signal of the signal source through the adjusted RIS phased array to achieve directional reception;

[0041] The arbitrary angle signal transmission includes: determining the target position and direction to be covered; adjusting the phase of each unit in the RIS phased array according to the direction of the target position, so that the antenna array forms a high-gain transmission beam in a specific direction; and transmitting the received signal at an arbitrary angle through the adjusted RIS phased array to change the signal transmission path.

[0042] In a specific embodiment, determining the position and direction of the signal source includes:

[0043] Use base stations to scan the area and collect signal strength and delay information from different directions;

[0044] Analyze the multipath components in the received signal and estimate the azimuth and elevation of the signal source based on the geometric position relationship;

[0045] In an area where there are multiple reference points, the specific coordinates of the signal source are located through triangulation.

[0046] In a specific embodiment, adjusting the phase of each unit in the RIS phased array according to the direction of the signal source so that the antenna array forms a high-gain receiving beam in a specific direction includes:

[0047] According to the direction parameters of the signal source and the relative positions between the RIS units, the phase difference that needs to be set for each RIS unit is calculated;

[0048] quantize the continuous phase differences into binary values ​​and generate corresponding binary sequences;

[0049] The working state of each RIS unit is controlled based on the binary sequence, and the signal is reflected according to a predetermined rule, so as to form a focused receiving beam in a specific direction.

[0050] Specifically, based on the generated binary sequence, each RIS unit is controlled to reflect the signal according to a preset rule. The preset rules here mainly include the following aspects:

[0051] In-phase superposition: When all RIS units reflect the same phase signal at the same time, a strong beam can be formed in a specified direction. This means that the phase difference of all units should be as consistent as possible to ensure the in-phase nature of the signal.

[0052] Equal amplitude reflection: Ideally, the amplitude of the reflected signal from each RIS unit should remain constant to avoid beam distortion caused by amplitude differences. This requires the RIS unit to have good linearity and stability.

[0053] Polarization alignment: If the signal source and receiver use a specific polarization method (such as vertical polarization or horizontal polarization), the RIS unit also needs to adjust the polarization characteristics of its reflected signal to match it, thereby improving transmission efficiency.

[0054] Real-time feedback: In a dynamic environment, channel conditions may change over time. Therefore, the system should have the ability to monitor the channel status in real time and update the binary sequence based on the latest information to maintain stable beam pointing.

[0055] In a specific embodiment, it also includes applying an intelligent control algorithm that can automatically adjust the working mode of the RIS unit according to environmental changes to ensure optimal performance.

[0056] Interference suppression: Through reasonable phase configuration, the interference caused by multipath effect can be effectively reduced and the communication quality can be improved.

[0057] Diversity gain: Using multiple elements in a RIS array, different copies of the same signal can be received from different paths, and these signals can be combined to achieve better reception.

[0058] In a specific embodiment, the expression for calculating the phase difference that needs to be set for each RIS unit is:

[0059]

[0060] Where k is the wave number, k = 2π / δ, δ is the wavelength, d n is the distance from the nth RIS unit to the reference point, θ is the direction parameter of the signal source.

[0061] In a specific embodiment, determining the target position and direction to be covered includes:

[0062] Set up receiving points at multiple different locations and simultaneously record the arrival time of the receiving beam from the same signal source;

[0063] Compare the time differences of the receiving beams at each receiving point;

[0064] Based on the time difference and the location information of the receiving point, the location of the signal source is calculated.

[0065] In a specific embodiment, adjusting the phase of each unit in the RIS phased array according to the direction of the target position so that the antenna array forms a high-gain transmission beam in a specific direction includes:

[0066] According to the target position and direction and the relative positions between the RIS units, the phase difference that needs to be set for each RIS unit is calculated;

[0067] quantize the continuous phase differences into binary values ​​and generate corresponding binary sequences;

[0068] The working state of each RIS unit is controlled based on the binary sequence to form a high-gain transmission beam in a specified direction.

[0069] Through the above technical solution, see Figure 1 As shown, the RIS phased array can directionally receive signals at any angle within the range and transmit them at any angle within the range. In the figure, each grid represents a diode, which uses the conduction and cutoff of high and low levels, that is, the low level (0) and high level (1) signals to control the phase (phase modulation) of each antenna unit, thereby realizing spatial pointing control of the beam.

[0070] The specific implementation method is as follows Figure 2 As shown, the RIS phased array antenna realizes different angles of beam pointing through the arrangement and combination of 0 and 1 (low level and high level) next to it.

[0071] Specifically, the present invention utilizes the characteristics of the RIS phased array for application in urban link building and mountain communication coverage.

[0072] Specifically, the RIS phased array can realize directionally receiving wireless signals from signal sources within a certain range of angles, and transmit them at any angle within the range, changing the transmission path. By utilizing the characteristics of changing the transmission path, it can be widely used in urban communication coverage, signal blind spot collection and signal coverage in mountainous areas.

[0073] For details, see Figure 3 , which is a schematic diagram of the characteristics of the RIS phased array provided in this embodiment. It can be seen from the figure that the RIS phased array can receive the signal network in a wide range with a high-gain directional beam, and then transmit it in any direction, thereby changing the propagation path of the signal, thereby effectively avoiding the situation where communication cannot be carried out due to obstruction. Figure 4 , which is a connection diagram for the RIS phased array provided in this embodiment, Figure 5 The schematic diagram of RIS urban coverage application provided for this embodiment shows that in many cases in the urban network, the base station signals of BS1 and BS2 cannot be directly sent to User1, 2, 3, and 4. It is necessary to change the signal propagation direction through RIS1, 2, and 3 to achieve communication between the base station and the coverage area. Figure 6 The RIS phased array mountain coverage application provided in this embodiment can be seen from the figure that the RIS phased array can make full use of the signal blind area in the mountainous area, use the characteristics of RIS, change the direction of the transmission path, bypass the signal blocking by the mountainous area, and finally cover the user base station to complete the blind area link communication.

[0074] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0075] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A communication coverage method based on a RIS wireless network, characterized in that: Including directional reception of signals and transmission of signals at any angle; The directional reception of signals includes: determining the position and direction of a signal source; adjusting the phase of each unit in the RIS phased array according to the direction of the signal source so that the antenna array forms a high-gain receiving beam in a specific direction; receiving the wireless signal of the signal source through the adjusted RIS phased array to achieve directional reception; The arbitrary angle signal transmission includes: determining the target position and direction to be covered; adjusting the phase of each unit in the RIS phased array according to the direction of the target position, so that the antenna array forms a high-gain transmission beam in a specific direction; and transmitting the received signal at an arbitrary angle through the adjusted RIS phased array to change the signal transmission path.

2. A communication coverage method based on a RIS wireless network according to claim 1, characterized in that: Determining the position and direction of the signal source comprises: Use base stations to scan the area and collect signal strength and delay information from different directions; Analyze the multipath components in the received signal and estimate the azimuth and elevation of the signal source based on the geometric position relationship; In an area where there are multiple reference points, the specific coordinates of the signal source are located through triangulation.

3. A communication coverage method based on a RIS wireless network according to claim 1, characterized in that: The method of adjusting the phase of each unit in the RIS phased array according to the direction of the signal source so that the antenna array forms a high-gain receiving beam in a specific direction includes: According to the direction parameters of the signal source and the relative positions between the RIS units, the phase difference that needs to be set for each RIS unit is calculated; quantizing continuous phase differences into binary values ​​and generating corresponding binary sequences; The working state of each RIS unit is controlled based on the binary sequence, and the signal is reflected according to a predetermined rule, so as to form a focused receiving beam in a specific direction.

4. A communication coverage method based on RIS wireless network according to claim 2, characterized in that: The expression for calculating the phase difference that needs to be set for each RIS unit is: Where k is the wave number, k = 2π / δ, δ is the wavelength, d n is the distance from the nth RIS unit to the reference point, θ is the direction parameter of the signal source.

5. The communication coverage method based on RIS wireless network according to claim 1, characterized in that: The determining of the target position and direction to be covered includes: Set up receiving points at multiple different locations and simultaneously record the arrival time of the receiving beam from the same signal source; Compare the time differences of the receiving beams at each receiving point; Based on the time difference and the location information of the receiving point, the location of the signal source is calculated.

6. The communication coverage method based on RIS wireless network according to claim 1, characterized in that: The method of adjusting the phase of each unit in the RIS phased array according to the direction of the target position so that the antenna array forms a high-gain transmission beam in a specific direction includes: According to the target position and direction and the relative positions between the RIS units, the phase difference that needs to be set for each RIS unit is calculated; quantizing continuous phase differences into binary values ​​and generating corresponding binary sequences; The working state of each RIS unit is controlled based on the binary sequence to form a high-gain transmission beam in a specified direction.

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