Ap, ap deployment system, and method for reducing ap co-channel interference

Abstract

The application provides an AP, an AP deployment system and a method for reducing AP co-frequency interference, and relates to the technical field of communication equipment. The AP comprises a reconfigurable antenna, the reconfigurable antenna has a switchable first polarization direction and a second polarization direction, and the first polarization direction is orthogonal to the second polarization direction. The AP, the AP deployment system and the method for reducing AP co-frequency interference provided by the application switch the polarization direction of the reconfigurable antenna in the AP, so that the polarization directions of the reconfigurable antennas in two APs of the same frequency are orthogonal, and thus the co-frequency interference between the APs is reduced or eliminated.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an AP, an AP deployment system, and a method for reducing co-channel interference of APs. Background Technology

[0002] With the development and popularization of wireless technology, more and more public places have provided wireless signal coverage. To meet the access needs of a large number of users, multiple wireless access points (APs) are usually deployed in a limited space.

[0003] Due to limited space, multiple APs equipped with directional antennas are usually deployed. By narrowing the beam of the directional antennas, the signal coverage range can be reduced, thus reducing interference between the APs.

[0004] However, even when the beam of a directional antenna is narrowed to its minimum, interference may still exist between the APs. Summary of the Invention

[0005] This application provides an AP, an AP deployment system, and a method for reducing co-channel interference among APs, which reduces or eliminates co-channel interference among APs by adjusting the polarization of a reconfigurable antenna, thereby reducing interference between APs.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] In a first aspect, this application provides an access point (AP) including a reconfigurable antenna having a switchable first polarization direction and a second polarization direction, wherein the first polarization direction is orthogonal to the second polarization direction.

[0008] In one possible implementation, the reconfigurable antenna has a feed network having a first state and a second state;

[0009] When the power supply network is in the first state, the power supply network is fed in a counterclockwise direction, and the reconfigurable antenna switches to the first polarization direction; when the power supply network is in the second state, the power supply network is fed in a clockwise direction, and the reconfigurable antenna switches to the second polarization direction.

[0010] In one possible implementation, the reconfigurable antenna includes a first dielectric substrate, a second dielectric substrate, a feed line, and a third dielectric substrate;

[0011] The second dielectric substrate is located on top of the first dielectric substrate, the top of the second dielectric substrate has a radiation channel, and the bottom of the second dielectric substrate has the feeding network.

[0012] The feeder is connected to the power supply network;

[0013] The third dielectric substrate is located above the second dielectric substrate, and the third dielectric substrate has a radiating structure. In one possible implementation, the power supply network further includes a first power supply patch and a second power supply patch;

[0014] The first power supply patch has a first end and a second end. The first end of the first power supply patch is connected to the second power supply patch through the first PIN diode, and the second end of the first power supply patch is connected to the second power supply patch through the second PIN diode. The second power supply patch is electrically connected to the feed line.

[0015] In one possible implementation, the power supply network includes a first PIN diode, a second PIN diode, a first power supply patch, and a second power supply patch;

[0016] The first power supply patch has a first end and a second end. The first end of the first power supply patch is connected to the second power supply patch through the first PIN diode, and the second end of the first power supply patch is connected to the second power supply patch through the second PIN diode. The second power supply patch is electrically connected to the feed line.

[0017] When the first PIN diode is turned on and the second PIN diode is turned off, the feeding network feeds the radiating structure in a clockwise direction to form right-hand circularly polarized electromagnetic radiation; when the second PIN diode is turned on and the first PIN diode is turned off, the feeding network feeds the radiating structure in a counterclockwise direction to form left-hand circularly polarized electromagnetic radiation.

[0018] In one possible implementation, the radiating structure includes a main radiating patch disposed at the bottom of the third dielectric substrate.

[0019] In one possible implementation, the radiating structure further includes a first parasitic patch in the shape of an annular ring;

[0020] The first parasitic patch is located on top of the third dielectric substrate.

[0021] In one possible implementation, the radiating structure further includes a plurality of second parasitic patches;

[0022] Each of the second parasitic patches is located at the bottom of the third dielectric substrate, and each of the second parasitic patches is spaced apart along the outer periphery of the main radiating patch.

[0023] In one possible implementation, the reconfigurable antenna further includes a cavity structure disposed on the first dielectric substrate, and the second dielectric substrate and the third dielectric substrate are located within the cavity structure.

[0024] In one possible implementation, the radiation channel includes a radiation slit, which comprises a plurality of strip slits intersecting at a point.

[0025] In one possible implementation, the first power supply patch and the second power supply patch each have a first voltage input port and a second voltage input port.

[0026] When the first voltage input port is connected to the positive terminal of the power supply and the second voltage input port is connected to the negative terminal of the power supply, the first PIN diode is turned on and the second PIN diode is turned off.

[0027] When the first voltage input port is connected to the negative terminal of the power supply and the second voltage input port is connected to the positive terminal of the power supply, the second PIN diode is turned on and the first PIN diode is turned off.

[0028] In one possible implementation, the power supply network further includes a capacitor and two inductors, the capacitor being disposed between the second power supply patch and the feed line;

[0029] The two inductors are respectively connected to the first voltage input port and the second voltage input port.

[0030] Secondly, this application provides an AP deployment system, which includes a first AP and a second AP, wherein the first AP and the second AP are APs selected from any of the above-mentioned options;

[0031] The first AP and the second AP operate at the same frequency, and one of the first AP and the second AP is in a first polarization direction and the other is in a second polarization direction.

[0032] Thirdly, this application provides a method for reducing co-channel interference of access points (APs). This method is applied to the aforementioned AP deployment system, which further includes a wireless access control server. The method includes the following steps:

[0033] The wireless access control server collects the status information of each AP;

[0034] The wireless access control server determines whether there is co-channel interference in the AP deployment system by using the status information of each AP.

[0035] If co-channel interference exists, the wireless access control server controls the first AP to switch polarization.

[0036] In one possible implementation, the method further includes:

[0037] The wireless access control server determines whether the co-channel interference has decreased;

[0038] If the co-channel interference is not reduced, the wireless access control server switches the first AP to the initial polarization state and controls the second AP to switch polarization.

[0039] The AP, AP deployment system, and method for reducing co-channel interference provided in this application have the following beneficial effects:

[0040] The AP provided in this application includes a reconfigurable antenna with a switchable first polarization direction and a second polarization direction, the first polarization direction and the second polarization direction being orthogonal. When interference exists between a first AP and a second AP on the same frequency, the polarization direction of the reconfigurable antenna in the first AP or the second AP can be switched to make the polarization directions of the reconfigurable antenna in the first AP and the second AP orthogonal, thereby reducing or eliminating the co-channel interference between the first AP and the second AP. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of an antenna in an AP provided in an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of another antenna structure in an AP provided in an embodiment of this application;

[0044] Figure 3 A bottom view of the second dielectric substrate provided in an embodiment of this application;

[0045] Figure 4 A top view of the second dielectric substrate provided in an embodiment of this application;

[0046] Figure 5 for Figure 4 A magnified view of the area within the dashed line;

[0047] Figure 6 A bottom view of the third dielectric substrate provided in the embodiments of this application;

[0048] Figure 7 A top view of the third dielectric substrate provided in an embodiment of this application;

[0049] Figure 8 A schematic diagram of a back cavity structure provided in an embodiment of this application;

[0050] Figure 9 This refers to a linear continuous deployment system in related technologies;

[0051] Figure 10 A linear continuous deployment system is provided as an embodiment of this application;

[0052] Figure 11 This is a high-density W-type deployment system in related technologies;

[0053] Figure 12 A high-density W-type deployment system is provided in the embodiments of this application;

[0054] Figure 13 This is a cellular deployment system in related technologies;

[0055] Figure 14 A cellular deployment system is provided as an embodiment of this application;

[0056] Figure 15 This is a flowchart illustrating a method for reducing co-channel interference of an access point (AP) according to an embodiment of this application.

[0057] Explanation of reference numerals in the attached figures:

[0058] 10. First dielectric substrate;

[0059] 11. Through hole; 12. First insulating post; 13. Second insulating post;

[0060] 20. Second dielectric substrate;

[0061] 21. Power supply network; 211. First PIN diode; 212. Second PIN diode;

[0062] 213. First power supply patch; 214. Second power supply patch;

[0063] 215. First voltage input port; 216. Second voltage input port; 217. Inductor;

[0064] 22. Radiation channel; 221. Strip-shaped gap;

[0065] 30. Feeder line;

[0066] 40. Third dielectric substrate;

[0067] 41. Radiation structure; 411. Main radiating patch; 412. First parasitic patch;

[0068] 413. Second parasitic patch;

[0069] 50. Back cavity structure;

[0070] 51. Snap-fit ​​protrusion. Detailed Implementation

[0071] In related technologies, even when the antenna beam is narrowed to its minimum, interference still exists between access points (APs). This problem arises because in scenarios with multiple APs, the limited number of channels makes it difficult for each AP to use a different channel, leading to co-channel interference between APs using the same channel. Even with limited deployment space and close proximity between APs, narrowing the antenna beam to its minimum cannot eliminate interference between APs, especially co-channel interference.

[0072] To address the aforementioned technical problems, embodiments of this application provide an AP, an AP deployment system, and a method for reducing co-channel interference between APs. By switching the polarization direction of the reconfigurable antenna in the AP, the polarization directions of the reconfigurable antennas in two APs operating on the same frequency are made orthogonal, thereby reducing or eliminating co-channel interference between APs.

[0073] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0074] This application provides an AP, which includes a reconfigurable antenna. The reconfigurable antenna can reconfigure the antenna parameters to switch between different operating modes. The reconfigurable antenna has a first polarization direction and a second polarization direction. When the reconfigurable antenna is in the first operating mode, it is in the first polarization direction. When the reconfigurable antenna is in the second operating mode, it is in the second polarization direction.

[0075] The first polarization direction is orthogonal to the second polarization direction. For example, one of the first and second polarization directions is a left-handed circular polarization direction, and the other is a right-handed circular polarization direction. Alternatively, one of the first and second polarization directions is a horizontal polarization direction, and the other is a vertical polarization direction.

[0076] When two access points (APs) are interfering with each other on the same channel, for ease of description, the two APs are defined as the first AP and the second AP, respectively. The interfering frequency can be reduced or eliminated by adjusting the polarization direction of the reconfigurable antenna in the first AP or the second AP so that the polarization directions of the reconfigurable antenna in the first AP and the second AP are orthogonal.

[0077] Compared to related technologies, the AP provided in this application has reconfigurable antennas with orthogonal and switchable first and second polarization directions. When there is co-channel interference between two APs, switching the polarization direction of one AP can make the polarization directions of the reconfigurable antennas in the two APs orthogonal, thereby reducing or eliminating co-channel interference between the first AP and the second AP.

[0078] In some embodiments, such as Figure 1 As shown, the reconfigurable antenna has a feed network 21, which has a switchable first state and a second state. When the feed network 21 is in the first state, it is fed counterclockwise, forming left-hand circularly polarized electromagnetic radiation, and the reconfigurable antenna switches to the first polarization direction, which is left-hand circularly polarized. When the feed network 21 is in the second state, it is fed clockwise, forming right-hand circularly polarized electromagnetic radiation, and the reconfigurable antenna switches to the second polarization direction, which is right-hand circularly polarized. This allows the reconfigurable antenna to form orthogonal and switchable first and second polarization directions.

[0079] In some embodiments, such as Figure 1 As shown, the reconfigurable antenna includes a first dielectric substrate 10, a second dielectric substrate 20, a feed line 30, and a third dielectric substrate 40.

[0080] The first dielectric substrate 10 serves as the ground plane in the reconfigurable antenna. The first dielectric substrate 10 is located below the second dielectric substrate 20 and the third dielectric substrate 40. The first dielectric substrate 10, the second dielectric substrate 20, and the third dielectric substrate 40 are projected along a direction towards the horizontal plane, with the first dielectric substrate 10 surrounding the second dielectric substrate 20 and the third dielectric substrate 40. This allows the first dielectric substrate 10 to reflect a portion of the electromagnetic waves, causing the reflected electromagnetic waves to superimpose with the electromagnetic waves generated in the reconfigurable antenna, thereby enhancing the radiation intensity of the reconfigurable antenna. Both the upper and lower surfaces of the first dielectric substrate 10 are coated with a metal layer. For example, the metal layer can be made of copper. The first dielectric substrate 10 has a through-hole 11 that penetrates the first dielectric substrate 10 along its thickness direction. The through-hole 11 allows the feed line 30 to pass through.

[0081] The second dielectric substrate 20 is located on the first dielectric substrate 10. For example, refer to Figure 1A first insulating post 12 is provided between the first dielectric substrate 10 and the second dielectric substrate 20 to create a first air layer between them. For example, in this embodiment, the distance between the first dielectric substrate 10 and the second dielectric substrate 20 can be 2-4 mm, preferably 3.5 mm. The distance between the first dielectric substrate 10 and the second dielectric substrate 20 is positively correlated with the directivity of the reconfigurable antenna, and the distance between the first dielectric substrate 10 and the second dielectric substrate 20 can be designed according to actual needs. Both the upper and lower surfaces of the second dielectric substrate 20 are coated with a metal layer, which can be made of copper. The upper surface metal layer can be used to form a radiation channel 22, and the lower surface metal layer can be used to fix the feed network 21.

[0082] refer to Figure 3 The bottom of the second dielectric substrate 20 has a power supply network 21, which can be coated on a metal layer on the lower surface of the second dielectric substrate 20. (See reference) Figure 4 The second dielectric substrate 20 has a radiation channel 22 on its top surface, which can be etched onto a metal layer on the upper surface of the second dielectric substrate 20. The radiation channel 22 can be a radiation slit or a radiation probe. Electromagnetic waves generated in the feed network 21 are coupled to the radiation mechanism 41 in the third dielectric substrate 40 through the radiation channel 22, thereby forming electromagnetic radiation.

[0083] Feeder 30 is an electromagnetic transmission line used to transmit signal energy. (Reference) Figure 1 and Figure 3 The feeder 30 passes through the through hole 11 and connects to the power supply network 21. For example, the output end of the feeder 30 is electrically connected to the power supply network 21 so that the feeder 30 is connected to the power supply network 21, and the input end of the feeder 30 can be electrically connected to the signal source so that the signal energy of the signal source is transmitted to the power supply network 21.

[0084] The third dielectric substrate 40 is located on the second dielectric substrate 20. For example, refer to Figure 1 A second insulating post 13 is provided between the third dielectric substrate 40 and the second dielectric substrate 20 to create a second air layer between them. For example, in this embodiment, the distance between the third dielectric substrate 40 and the second dielectric substrate 20 can be 2-4 mm, preferably 3.5 mm. The distance between the third dielectric substrate 40 and the second dielectric substrate 20 is positively correlated with the directivity of the reconfigurable antenna and can be designed according to actual needs. The second insulating post 13 and the first insulating post 11 can be an integral structure. Both the upper and lower surfaces of the third dielectric substrate 40 are coated with a metal layer, which can be made of copper. (Reference) Figure 1The third dielectric substrate 40 has a radiating structure 41, which may include a main radiating patch 411. For example, refer to... Figure 6 The main radiating patch 411 is coated on the lower surface metal layer of the third dielectric substrate 40.

[0085] This allows the feed network 21 to have switchable first and second states. When the feed network 21 is in the first state, it feeds the radiating structure 41 in a counterclockwise direction, forming left-hand circularly polarized electromagnetic radiation. The reconfigurable antenna switches to the first polarization direction, which is left-hand circularly polarized. When the feed network 21 is in the second state, it feeds the radiating structure 41 in a clockwise direction, forming right-hand circularly polarized electromagnetic radiation. The reconfigurable antenna switches to the second polarization direction, which is right-hand circularly polarized. This allows the reconfigurable antenna to form orthogonal and switchable first and second polarization directions.

[0086] In some embodiments, such as Figure 3 As shown, the power supply network 21 includes a first PIN diode 211, a second PIN diode 212, a first power supply patch 213, and a second power supply patch 214. The first power supply patch 213 can be ring-shaped, and the second power supply patch 214 can be strip-shaped. (Reference) Figure 4 The first power supply patch 213 has a first end 2131 and a second end 2132. The second power supply patch 214 may be rectangular or approximately rectangular.

[0087] refer to Figure 4 The first end 2131 of the first feed patch 213 is connected to the second feed patch 214 through the first PIN diode 211, and the second end 2132 of the first feed patch 213 is connected to the second feed patch 214 through the second PIN diode 212. The second feed patch 214 is electrically connected to the feed line 30.

[0088] refer to Figure 3 and Figure 4 When the first PIN diode 211 is turned on and the second PIN diode 212 is turned off, the power supply network 21 feeds the radiation structure 41 in a clockwise direction through the radiation channel 22, thereby forming right-hand circularly polarized electromagnetic radiation.

[0089] When the second PIN diode 212 is turned on and the first PIN diode 211 is turned off, the power supply network 21 feeds the radiation structure 41 in a counterclockwise direction through the radiation channel 22, thereby forming left-hand circularly polarized electromagnetic radiation.

[0090] The AP provided in this embodiment switches the decreasing direction of the feed phase difference between the feed network 21 and the radiating structure 41 by adjusting the on / off state of the first PIN diode 211 and the second PIN diode 212, thereby providing either left-hand circularly polarized or right-hand circularly polarized electromagnetic radiation. This allows the reconfigurable antenna to have both left-hand and right-hand circularly polarized directions. Furthermore, by switching between the two polarization directions, co-channel interference between APs is reduced or eliminated, thereby reducing interference between APs on the same frequency.

[0091] In some embodiments, such as Figure 6 As shown, the radiating structure 41 includes a main radiating patch 411, which can be circular. The circular main radiating patch 411 can be coated on the metal layer at the bottom of the third dielectric substrate 40.

[0092] Building upon the above embodiments, the radiating structure 41 further includes a parasitic patch that can introduce additional resonant modes. These parasitic patches can interact with the resonant modes of the main radiating patch 411, resulting in a wider bandwidth and better axial ratio performance. Thus, the axial ratio beamwidth of the reconfigurable antenna is broadened through the parasitic patch.

[0093] In one possible implementation, refer to Figure 7 The radiating structure 41 includes an annular first parasitic patch 412, which can be coated on a metal layer on top of the third dielectric substrate 40.

[0094] In another possible implementation, such as Figure 6 As shown, the radiating structure 41 includes a second parasitic patch 413, which can be elongated, such as an arc-shaped or rectangular elongated patch. The number of second parasitic patches 413 can be multiple, such as two, three, four, or more. The number of second parasitic patches 413 can be determined based on the placement conditions at the bottom of the third dielectric substrate. Figure 6 As shown in the example, there are four second parasitic patches 413. All four second parasitic patches 413 can be coated on the metal layer at the bottom of the third dielectric substrate 40 and are spaced apart along the outer periphery of the main radiating patch 411.

[0095] It should be noted that the radiating structure 41 may also include both the first parasitic patch 412 and the first parasitic patch 413. The first parasitic patch 412 and / or the first parasitic patch 413 can introduce additional resonant modes that can interact with the resonant mode of the main radiating patch 411, resulting in a wider bandwidth and better axial ratio performance. This broadens the axial ratio beamwidth of the reconfigurable antenna.

[0096] In some embodiments, such as Figure 2 and Figure 8As shown, the reconfigurable antenna also includes a cavity structure 50. The cavity structure 50 is made of a conductive material. For example, the cavity structure 50 may be made of metals such as copper, aluminum, or stainless steel. The cavity structure 50 can be an annular frame, and it is mounted on the first dielectric substrate 10. In one possible implementation, refer to... Figure 8 The bottom of the back cavity structure 50 has a snap-fit ​​protrusion 51, and the first dielectric substrate 10 has a corresponding snap-fit ​​groove, so that the back cavity structure 50 can be installed on the first dielectric substrate 10.

[0097] refer to Figure 2 The second dielectric substrate 20 and the third dielectric substrate 40 are located within the cavity structure 50. The cavity structure 50 surrounds the second dielectric substrate 20 and the third dielectric substrate 40. A vertical current can be formed on the circumferential sidewalls of the cavity structure 50, thereby further widening the axial ratio beamwidth of the reconfigurable antenna.

[0098] In some embodiments, such as Figure 4 As shown, the radiation channel 22 is a radiation slit, and the radiation channel 22 includes multiple strip-shaped slits 221, each of which can be a long rectangular shape. The number of strip-shaped slits 221 can be two, three, four, or more. All strip-shaped slits 221 intersect at a single point. Figure 4 As shown in the example, the radiation channel 22 includes four strip-shaped slots 221, which intersect at the center of the first feed patch 213. Two of the strip-shaped slots 221 form a first set of cross-shaped slots, which can serve as a feed point. The electromagnetic waves generated in the feed network 21 excite two orthogonal and equal-amplitude linearly polarized waves at the first set of cross-shaped slots. When the phase difference between the two linearly polarized waves is controlled at 90 degrees, the two linearly polarized waves are combined into a circularly polarized wave.

[0099] The other two strip slots 221 form a second set of cross-shaped slots, thus creating a second feed. Electromagnetic waves can be excited into circularly polarized waves at the second feed point. Two orthogonal circularly polarized waves can be excited through the two feed points, thereby expanding the matching bandwidth of the reconfigurable antenna.

[0100] It should be noted that the reference Figure 4 The lengths of each strip slot 221 may be different. The length of each strip slot 221 affects the standing wave performance of the reconfigurable antenna. The length of each strip slot 221 can be designed according to the standing wave performance requirements of the reconfigurable antenna.

[0101] In one embodiment, such as Figure 3As shown, the first power supply patch and the second power supply patch each have a first voltage input port 215 and a second voltage input port 216. One of the first voltage input port 215 and the second voltage input port 216 is used to connect to the positive terminal of the power supply, and the other is used to connect to the negative terminal of the power supply, thereby inputting voltage into the power supply network 21. It should be noted that the power supply can be a DC power supply.

[0102] When the first voltage input port 215 is connected to the positive terminal of the power supply, and the second voltage input port is connected to the negative terminal of the power supply. (Reference) Figure 3 When the first PIN diode 211 is turned on and the second PIN diode 212 is turned off, the power supply network 21 feeds the radiation structure 41 in a clockwise direction through the radiation channel 22, thereby forming right-hand circularly polarized electromagnetic radiation.

[0103] When the first voltage input port 215 is connected to the negative terminal of the power supply, and the second voltage input port is connected to the positive terminal of the power supply. (Reference) Figure 3 When the second PIN diode 212 is turned on and the first PIN diode 211 is turned off, the power supply network 21 feeds the radiation structure 41 in a counterclockwise direction through the radiation channel 22, thereby forming left-hand circularly polarized electromagnetic radiation.

[0104] This embodiment controls the connection between the first voltage input port 215 and the second voltage input port 216 and the power supply to achieve positive or negative voltage input of the power supply, thereby controlling the on / off state of the first PIN diode and the second PIN diode, which facilitates switching the polarization mode of the reconfigurable antenna to reduce or eliminate AP co-channel interference, thereby reducing interference between APs.

[0105] In some embodiments, reference Figure 3 The power supply network 21 also includes two inductors 217, which are respectively connected to the first voltage input port 215 and the second voltage input port 216. Since the first voltage input port 215 and the second voltage input port 216 are used to connect to the power supply, the inductors 217 filter out high-frequency noise signals in the power supply input, thereby improving the stability of the power supply and the purity of the electrical signal. The inductors 217 can also prevent the AC signal input from the feeder 30 from affecting the power supply.

[0106] refer to Figure 3 The power supply network 21 also includes a capacitor 218, which is positioned between the feeder 30 and the second power supply patch 214 to isolate the DC signal input from the feeder 30 and improve the stability of the power supply network 21. The capacitor 218 also prevents the DC signal from the power input from entering the feeder 30 and affecting subsequent systems.

[0107] This application also provides an AP deployment system, which includes a first AP and a second AP. The first AP and the second AP are APs as described in any of the above embodiments. The first AP and the second AP operate at the same frequency, and one of the first AP and the second AP is located in a first polarization direction, while the other is located in a second polarization direction. It should be noted that, in addition to the first AP and the second AP, the AP deployment system may also include other APs.

[0108] In an AP deployment system, if the first AP and the second AP experience co-channel interference, the polarization direction of the reconfigurable antennas in either the first or second AP can be adjusted to make them orthogonal. This reduces or eliminates the co-channel interference.

[0109] In one possible implementation, the APs in the AP deployment system are deployed in a straight line. A straight line deployment means that multiple APs are arranged in a straight line or a near-straight line. A straight line deployment is suitable for narrow areas such as corridors and passageways.

[0110] In a linear deployment scheme without orthogonal polarization, refer to Figure 9 In this deployment scheme, each polygon represents an Access Point (AP), and the number within each polygon represents the channel occupied by that AP. APs occupying the same channel are co-frequency APs. Two APs on the same frequency are spaced six deployment intervals apart, meaning there are six APs between them. For example, two APs occupying channel 36 are spaced six deployment intervals apart, and the APs within each of these six intervals occupy different channels, resulting in this AP deployment system using many channels but having limited bandwidth.

[0111] In embodiments of this application, orthogonal polarization is introduced. For example, refer to... Figure 10 The first polarization direction and the second polarization direction are orthogonal. In the AP deployment system, APs are deployed continuously in a straight line. In this deployment scheme, each polygon represents an AP, and the number within each polygon represents the channel occupied by that AP. APs occupying the same channel are co-frequency APs. Two APs with the same frequency and polarization are spaced six deployment intervals apart; for example, two APs occupying channel 36 with the same frequency and polarization are spaced six deployment intervals apart. Two APs with the same frequency and orthogonal polarization are spaced three deployment intervals apart; for example, two APs occupying channel 36 with the same frequency and orthogonal polarization are spaced three deployment intervals apart. This reduces the number of channels required in the AP deployment system provided in this embodiment, freeing up spectrum resources to expand the bandwidth of a single channel. This increases the amount of information transmitted on the same channel, thereby expanding the bandwidth to meet the network requirements for high throughput bandwidth, for example, expanding from a 40M deployment to an 80M deployment.

[0112] In another embodiment, the APs in the AP deployment system are arranged in a high-density W-shaped configuration. The high-density W-shaped configuration means that the APs are arranged in a W-shaped path or an approximate W-shaped path. The high-density W-shaped configuration is suitable for areas such as conference rooms, lecture halls, stadiums, and exhibition halls.

[0113] In a high-density W-shaped deployment scheme without the introduction of orthogonal polarization, refer to Figure 11 In this deployment scheme, each polygon represents an Access Point (AP), and the number within each polygon represents the channel occupied by that AP. APs occupying the same channel are co-frequency APs. Two co-frequency APs can be deployed with a spacing of three deployment intervals, allowing for the deployment of up to six APs. For example, two APs occupying channel 52 can be deployed with a spacing of six deployment intervals, allowing for the deployment of six APs.

[0114] In embodiments of this application, orthogonal polarization is introduced. For example, refer to... Figure 12 The first polarization direction and the second polarization direction are orthogonal. In this deployment scheme, each polygon represents an AP, and the number within each polygon represents the channel occupied by that AP. APs occupying the same channel are co-frequency APs. Co-frequency and co-polarized APs can be spaced six deployment intervals apart, allowing for the deployment of twelve APs. For example, two co-frequency and co-polarized APs occupying channel 52 can be spaced six deployment intervals apart, allowing for the deployment of twelve APs. Compared to a high-density W-shaped deployment scheme that does not introduce orthogonal polarization, this embodiment can increase the deployment interval to increase the isolation of co-frequency APs and reduce interference between them.

[0115] In another embodiment, the APs in the AP deployment system are deployed in a honeycomb pattern, where each AP is arranged in a hexagonal or near-hexagonal shape. Honeycomb deployment is suitable for large office buildings, hotels, airports, train stations, residential areas, schools, and other similar locations.

[0116] In a high-density cellular deployment scheme without the introduction of orthogonal polarization, refer to Figure 13 Two access points (APs) on the same frequency can be spaced three times apart, allowing for the deployment of up to seven APs. For example, two APs occupying channel 60 can be spaced three times apart, allowing for the deployment of seven APs.

[0117] In embodiments of this application, orthogonal polarization is introduced. For example, refer to... Figure 14 The first polarization direction and the second polarization direction are orthogonal. APs with the same frequency and polarization can be deployed with a spacing of six intervals, allowing for the deployment of up to fourteen APs. For example, two APs with the same frequency and polarization occupying channel 60 can be deployed with a spacing of six intervals, allowing for the deployment of fourteen APs. Compared to a high-density W-shaped deployment scheme that does not introduce orthogonal polarization, the embodiments of this application can increase the deployment spacing to increase the isolation of APs with the same frequency and reduce interference between them.

[0118] refer to Figure 15This application also provides a method for reducing co-channel interference of access points (APs). This method is applied to the AP deployment system in any of the above embodiments. The AP deployment system further includes a wireless access control server, which collects AP status information and controls the switching of AP polarization. The method includes the following steps:

[0119] A. The wireless access control server collects status information from each AP, which can include the OBSS channel utilization rate. OBSS channel utilization rate is the degree to which the channel is effectively used within a given time; a high channel utilization rate means that channel resources are being fully utilized.

[0120] It should be noted that before collecting the status information of each AP, all APs can be configured to have the same polarization. Specifically, this can be done through the wireless access control server, such as configuring all APs to left-hand circular polarization or right-hand circular polarization. This facilitates subsequent polarization switching between the first and second APs.

[0121] B. The wireless access control server uses the above status information to determine whether there is co-channel interference in the AP deployment system. For example, if the OBSS channel utilization is lower than the set value, there is co-channel interference between the two corresponding co-channel APs; otherwise, there is no co-channel interference.

[0122] Co-channel interference degrades signal quality, increases the bit error rate, and thus reduces OBSS channel utilization. OBSS channel utilization can be used as information for detecting co-channel interference; low OBSS channel utilization indicates the presence of co-channel interference, while high OBSS channel utilization indicates weak or non-existent co-channel interference.

[0123] C. If co-channel interference exists, the transmit power of the AP experiencing the interference can be adjusted to reduce its signal coverage area, thereby eliminating the interference. However, if the interference persists even when the transmit power of the AP experiencing co-channel interference is reduced to its minimum value, adjusting the AP's transmit power will not eliminate the interference. The wireless access control server controls the polarization switching of the first AP among two APs experiencing co-channel interference. For example, if the initial polarization of each AP is left-hand circular polarization, the first AP is switched to right-hand circular polarization. After the switch, the polarization directions of the first and second APs are orthogonal, thereby reducing or eliminating co-channel interference and thus reducing interference between APs.

[0124] If there is no co-channel interference, the AP deployment system is available for user access. In this case, the AP deployment system operates normally without co-channel interference.

[0125] This application embodiment, based on adjusting the AP transmit power to reduce the AP signal range and thus reduce interference between APs, adds an adjustable method of switching the AP polarization direction to further reduce or eliminate interference between APs.

[0126] refer to Figure 15 Based on the above embodiments, the method for reducing AP co-channel interference further includes the following steps:

[0127] D. After the wireless access control server controls the first AP among two APs with co-channel interference to switch polarization, the wireless access control server determines whether the co-channel interference has been reduced. For example, it can detect whether the co-channel interference has been reduced by detecting the OBSS channel utilization of the two APs with co-channel interference.

[0128] E. If the co-channel interference is not reduced, the wireless access control server controls the first AP among the two APs experiencing co-channel interference to switch to its initial polarization, and controls the second AP to switch its polarization. In the AP deployment system, the second AP can be the co-channel AP closest to the first AP. If the co-channel interference is reduced, the AP deployment system is made available for user access.

[0129] In this embodiment of the application, when the interference between APs on the same frequency is not reduced after the first AP switches its polarization direction, the interference is reduced by switching the first AP to its initial polarization and switching the polarization direction of the second AP. By switching the polarization direction of the second AP, the interference between APs on the same frequency is reduced. The interference situation of APs before and after switching polarization is compared to determine whether to switch polarization, so as to avoid increasing the interference between APs after switching polarization.

[0130] In addition, embodiments of this application may also include the following steps:

[0131] The wireless access control server determines whether co-channel interference has decreased. For example, it detects whether co-channel interference has decreased by monitoring the OBSS channel utilization of two access points that are experiencing co-channel interference.

[0132] If co-channel interference is reduced, the AP deployment system can be made available for user access.

[0133] If co-channel interference is not reduced, the wireless access control server controls the second AP to switch to its initial polarization and deploys the AP in the system for user access. The initial polarization can be the polarization state of the second AP in step A.

[0134] If switching the polarization of two APs operating on the same frequency fails to reduce co-channel interference, it indicates a potential fault in the AP deployment system or that switching polarization may not reduce co-channel interference. In this case, restoring the polarization of both APs to their initial state facilitates troubleshooting and prevents increased co-channel interference after switching polarization.

[0135] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0136] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0137] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0138] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0139] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An AP, characterized in that, The device includes a reconfigurable antenna having a switchable first polarization direction and a second polarization direction, wherein the first polarization direction and the second polarization direction are orthogonal.

2. The AP according to claim 1, characterized in that, The reconfigurable antenna has a feed network (21) having a first state and a second state; when the feed network (21) is in the first state, the feed network (21) is fed in a counterclockwise direction, and the reconfigurable antenna switches to the first polarization direction; when the feed network (21) is in the second state, the feed network (21) is fed in a clockwise direction, and the reconfigurable antenna switches to the second polarization direction.

3. The AP according to claim 2, characterized in that, The reconfigurable antenna includes a first dielectric substrate (10), a second dielectric substrate (20), a feed line (30), and a third dielectric substrate (40). The second dielectric substrate (20) is located on the first dielectric substrate (10), the top of the second dielectric substrate (20) has a radiation channel (22), and the bottom of the second dielectric substrate (20) has the power supply network (21). The feeder (30) is connected to the power supply network (21); The third dielectric substrate (40) is located above the second dielectric substrate (20), and the third dielectric substrate (40) has a radiating structure (41).

4. The AP according to claim 3, characterized in that, The radiating structure (41) includes a main radiating patch (411) disposed at the bottom of the third dielectric substrate (40).

5. The AP according to claim 4, characterized in that, The radiating structure (41) also includes a first parasitic patch (412) in the shape of an annulus. The first parasitic patch (412) is located on top of the third dielectric substrate (40).

6. The AP according to claim 4, characterized in that, The radiating structure (41) also includes a plurality of second parasitic patches (413). Each of the second parasitic patches (413) is located at the bottom of the third dielectric substrate (40), and each of the second parasitic patches (413) is spaced apart along the outer periphery of the main radiating patch (411).

7. The AP according to any one of claims 3-6, characterized in that, The reconfigurable antenna further includes a cavity structure (50), which is disposed on the first dielectric substrate (10), and the second dielectric substrate (20) and the third dielectric substrate (40) are located within the cavity structure (50).

8. The AP according to any one of claims 3-6, characterized in that, The radiation channel (22) includes a plurality of strip-shaped slits, each of which intersects at a point.

9. An AP deployment system, characterized in that, The AP deployment system includes a first AP and a second AP, wherein the first AP and the second AP are APs as described in any one of claims 1-8; The first AP and the second AP operate at the same frequency, and one of the first AP and the second AP is in a first polarization direction and the other is in a second polarization direction.

10. A method for reducing co-channel interference of an access point (AP), characterized in that, The method is applied to the AP deployment system as described in claim 9, wherein the AP deployment system further includes a wireless access control server, and the method includes the following steps: The wireless access control server collects the status information of each AP; The wireless access control server determines whether there is co-channel interference in the AP deployment system by using the status information of each AP. If co-channel interference exists, the wireless access control server controls the first AP to switch polarization.

11. The method for reducing AP co-channel interference according to claim 10, characterized in that, The method further includes: The wireless access control server determines whether the co-channel interference has decreased; If the co-channel interference is not reduced, the wireless access control server controls the first AP to switch to the initial polarization state and controls the second AP to switch polarization.

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