Method and system for improving throughput rate of wireless communication in 5G limited space

Abstract

The invention discloses a method and a system for improving the throughput rate of wireless communication in a 5G limited space. In the method, according to a 5G throughput rate formula proposed by a 3GPP protocol, the throughput rate of a system is remarkably improved by optimizing a modulation mode and coding efficiency of a 5G signal. Based on the method, a wireless communication system combining the high-gain metasurface with the CPE is invented, wherein the high-gain metasurface is surface-mounted on the glass. According to the system, a high-gain metasurface is surface-mounted on glass, transmission of signals emitted by a micro base station is enhanced, the signals are focused to a specific area in a limited space, the effect of fusing transmission gain and focusing gain is achieved, signals in a near-field limited area are enhanced, CPE relay radiation is arranged in the area so as to cover the whole limited space, and the effect of transmitting the signals in the limited space is achieved. And interaction with users in the space is realized. The wireless communication system provided by the invention is suitable for various application scenes containing limited space features, and solves the problem that high throughput rate communication is difficult to realize for users in complex scenes.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and in particular to a method and system for improving the wireless communication throughput rate within a 5G limited space. Background Art

[0002] With the widespread application of 5G (5th Generation Mobile Communication Technology), the demand for throughput in the field of wireless communications has grown rapidly. The main reason is the popularity of emerging applications such as high-definition video, AR / VR (Augmented Reality / Virtual Reality) and the Internet of Things, which require higher throughput and stable network support. However, the high-frequency band signals used by 5G are easily blocked by obstacles and attenuated in complex scenes (such as indoors, subways, etc.), resulting in reduced signal coverage and transmission efficiency, making it difficult to maintain efficient data transmission. Metasurface technology is regarded as a potential communication technology that can control the amplitude and phase of the signal by regulating the reflection, transmission and refraction characteristics of electromagnetic waves. In a confined space, the metasurface can effectively enhance the transmission and focusing performance of the signal, improve the channel quality, and thus greatly improve the throughput of the communication system. In addition, the glass-based transparent metasurface design is compatible with confined space environments such as indoors, and has significant application advantages.

[0003] In the prior art, a common way to enhance indoor signals is to design a metasurface for signal amplitude or phase based on glass, and correspondingly realize the transmission gain or focusing gain of the signal. However, the metasurface designed in the above manner has limited signal enhancement, and it is difficult to achieve comprehensive optimization of signal transmission gain and focusing gain at the same time, resulting in limitations in system communication performance. In addition, in the prior art, the calculation of user communication rate is usually evaluated based on the channel capacity provided by the Shannon formula. For example, the invention patent CN202211692670 discloses a metasurface-assisted wireless communication system, which includes a base station, an intelligent metasurface, and a terminal user. After the signal sent by the base station reaches the metasurface, the metasurface unit adjusts the amplitude and phase of the incident signal to optimize the SNR (Signal-to-Noise Ratio) under the base station-metasurface-multi-user link, and calculates the channel capacity accessible to multiple users by the Shannon formula, thereby replacing the communication rate achievable by the user. The above communication system aims to optimize the communication performance of users in open scenes, that is, to meet the situation where the user is located in the far field area of ​​the metasurface. However, when achieving signal coverage in a confined space such as indoors, users are often in the near-field radiation area of ​​the metasurface. At this time, the phase change of the signal incident into the confined space through the metasurface unit is more affected by the distance, which in turn affects the signal enhancement in the confined space. In addition, the user achievable rate calculated is the maximum theoretical rate that the user can reach under ideal conditions, and does not take into account the selection of modulation and coding of 5G signals in actual communication scenarios, so the communication rate calculated here cannot be achieved in actual scenarios.

[0004] The metasurface proposed in the above invention patent adopts an active unit design to simultaneously control the amplitude and phase of the incident signal, which requires the introduction of an additional bias circuit to provide the necessary excitation, increasing the complexity and cost of the system. At the same time, when designed for transparent media such as glass as the substrate, active devices will aggravate the decline in transparency, and the introduction of the excitation source may also bring additional noise and interference, affecting the quality and stability of the incident signal. Summary of the invention

[0005] The purpose of the present invention is to provide a solution to meet the wireless communication throughput requirements of 5G users in a confined space. To achieve the above purpose, a method and system for improving the wireless communication throughput in a 5G confined space are provided, which effectively improves the signal quality and coverage of users in a confined space such as indoors, and enhances the wireless communication throughput of users in the confined space.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] According to a first aspect of an embodiment of the present invention, a method for improving the throughput of wireless communication in a 5G limited space is provided. According to the 3GPP (3rd Generation Partnership Project) protocol, in the throughput improvement method, the throughput that can be achieved by the channel is expressed as:

[0008]

[0009] Where J is the number of aggregated carriers, N is the number of resource blocks, OH is the overhead, v is the number of MIMO layers, Ts is the average duration of OFDM symbols, f is the uplink and downlink symbol ratio, Q is the modulation order, and R is the coding efficiency. The selection of modulation order Q and coding efficiency R is related, and the two are collectively called modulation and coding scheme (MCS).

[0010] The throughput improvement method includes the following steps: the micro base station sends a signal, the high-gain metasurface improves the channel quality of the link from the metasurface to the CPE (Customer Premises Equipment) by regulating the incident signal, and after the CPE receives the signal, the current channel state information is fed back to the micro base station through the uplink, and the micro base station optimizes the data transmission strategy according to the current channel quality to improve the achievable throughput of the system;

[0011] The optimized data transmission strategy relies on the dynamic adjustment of the modulation and coding scheme for sending 5G signals by the micro base station. On the basis of ensuring that the communication system BLER (Block Error Rate) does not exceed the system minimum requirement of 10%, the signal configuration is optimized to achieve the maximum throughput rate under the current channel.

[0012] In one embodiment of the present invention, the specific operation steps of applying the throughput improvement method to indoor wireless communications include:

[0013] S101: The micro base station sends a 5G signal;

[0014] S102: The high-gain metasurface regulates the amplitude and phase of the incident signal to achieve high signal gain that takes into account both transmission gain and focusing gain in a limited area of ​​the near field;

[0015] The high-gain metasurface in step S102 includes an array of 40×40 metasurface units, the design of the metasurface unit is based on Low-E (low-emissivity) glass, and is suitable for the 5GN79 frequency band. Each of the metasurface units is composed of a metal layer and a dielectric layer, and the metal layer includes: a first metal layer 1, a second metal layer 2, and a third metal layer 3. The dielectric layer includes: a first dielectric layer 4 and a second dielectric layer 5; the first metal layer 1, the first dielectric layer 4, the second metal layer 2, the second dielectric layer 5, and the third metal layer 3 are arranged in sequence from top to bottom;

[0016] The high-gain metasurface unit is in the shape of a square with a side length of 12 mm. The first metal layer 1 and the third metal layer 3 have the same shape and size. The metal layer patterns used include a Chinese-shaped metal pattern and a square-shaped metal pattern, that is, the first metal layer 1 and the third metal layer 3 of each type of metasurface unit are one of the Chinese-shaped metal pattern and the square-shaped metal pattern, and the metal patterns in the first metal layer 1 and the third metal layer 3 are aligned and overlapped, the pattern of the second metal layer 2 is a square-shaped metal pattern, the metal pattern layer is symmetrical about the unit center, attached to the dielectric layer, and has a thickness of 50 microns. The first dielectric layer 4 and the second dielectric layer 5 have the same shape and size, and the dielectric material is PMMA (Poly (methylmethacrylate)) with a thickness of 1 mm;

[0017] The high-gain metasurface unit can adjust the size of the square ring inside the U-shaped metal pattern in the first and third metal layers or the size of the square ring in the U-shaped metal pattern to achieve amplitude and phase control of the incident signal.

[0018] The size of the high-gain metasurface is 480 mm×480 mm, and is formed by 40×40 high-gain metasurface units according to the expected amplitude and phase distribution, that is, each unit with different amplitude and phase adjustments to the incident signal corresponds to a metal pattern size to achieve transmission gain and focusing gain relative to Low-E glass. The gain of the high-gain metasurface array to the incident signal can be expressed as:

[0019] Gain = G t +G f ,

[0020] Among them G t is the transmission gain, G f The gain of the incident signal by the metasurface enhances the SNR in a limited area of ​​the near field. In addition, the designed high-gain metasurface array has a high transmittance of 80.4%.

[0021] S103: After the CPE is deployed in the near-field limited area to receive the enhanced incident signal, the CPE radiates again to achieve signal coverage of the entire limited space. At the same time, the CPE feeds back channel status information to the micro base station based on the received signal quality;

[0022] The feedback process of the CPE to the incident signal in step S103 is as follows:

[0023] After receiving the signal enhanced by the metasurface, the CPE feeds back the current channel status information to the micro base station through the uplink;

[0024] S104: The micro base station dynamically adjusts the modulation and coding scheme of its transmitted signal according to the received channel state information, thereby achieving a higher system achievable throughput rate;

[0025] The dynamic adjustment process of the micro base station to the incident signal in step S104 is as follows:

[0026] Based on the relationship between the BLER of the communication system and the SNR (Signal to Noise Ratio) at the receiving end, the micro base station ensures that the communication system meets the minimum requirement of BLER not exceeding 10% to maintain normal communication. The micro base station dynamically adjusts the modulation and coding scheme of the transmitted signal, selects the highest modulation and coding scheme that meets the system requirements, increases the amount of information carried by the signal, and achieves the maximum throughput under the current channel state;

[0027] S105: The CPE re-radiates the signal adjusted by the micro base station to the limited space to achieve signal coverage of the entire space.

[0028] In one embodiment of the present invention, the specific operation steps of applying the throughput improvement method to high-speed rail wireless communication include:

[0029] S201: The micro base station sends a 5G signal;

[0030] S202: The high-gain metasurface regulates the amplitude and phase of the incident signal and focuses the incident signal on the CPE on the other side; after receiving the enhanced signal, the CPE achieves signal coverage in the entire limited space; in addition, the CPE sends channel status information back to the micro base station through the uplink based on the received signal quality;

[0031] S203: The micro base station dynamically adjusts the modulation and coding scheme of its transmitted signal according to the received channel state information, so that the transmitted signal can carry more information, thereby improving the throughput performance achievable by the wireless communication system;

[0032] S204: The CPE re-radiates the signal adjusted by the micro base station to the limited space, thereby achieving signal enhancement and coverage of the entire space, and improving the real-time throughput of the interaction between the user and the CPE in the limited space.

[0033] According to the second aspect of an embodiment of the present invention, a system for improving the throughput rate of wireless communications within a 5G confined space is also provided, including a micro base station, a high-gain metasurface and a CPE; the micro base station is used to send 5G signals, and dynamically adjust the modulation and coding scheme of the transmitted signal through the channel state information fed back by the CPE to achieve a higher system achievable throughput rate; the high-gain metasurface is attached to the glass, and is used to enhance the strength and channel quality of the wireless signal within a limited area; the CPE is deployed in the limited area to achieve signal coverage of the entire confined space, and interact with data with terminal users.

[0034] In one embodiment of the present invention, the high-gain metasurface includes an array of N×N metasurface units, the design of the metasurface unit is based on Low-E (low-emissivity) glass, and is suitable for the 5G frequency band. Each of the metasurface units is composed of a metal layer and a dielectric layer, and the metal layer includes: a first metal layer, a second metal layer, and a third metal layer. The dielectric layer includes: a first dielectric layer and a second dielectric layer; the first metal layer, the first dielectric layer, the second metal layer, the second dielectric layer, and the third metal layer are arranged in sequence from top to bottom;

[0035] The high-gain metasurface unit is in a square shape, the side length of the unit is p, the first metal layer and the third metal layer are in the same shape and size, the metal layer patterns used include a Chinese-shaped metal pattern and a Chinese-shaped metal pattern, that is, the first metal layer and the third metal layer of each type of metasurface unit are one of the Chinese-shaped metal pattern and the Chinese-shaped metal pattern, and the metal patterns in the first metal layer and the third metal layer are aligned and overlapped, the second metal layer pattern is a Chinese-shaped metal pattern, the metal pattern layer is symmetrical about the unit center, attached to the dielectric layer, and has a thickness of 50 microns, the first dielectric layer and the second dielectric layer are in the same shape and size, the dielectric material is PMMA, and the thickness is 1 mm;

[0036] The high-gain metasurface unit can adjust the size of the square ring inside the U-shaped metal pattern in the first and third metal layers or the size of the square ring in the U-shaped metal pattern to achieve amplitude and phase control of the incident signal.

[0037] In one embodiment of the present invention, the high-gain metasurface is formed by N×N high-gain metasurface units according to the expected amplitude and phase distribution, that is, each unit with different amplitude and phase adjustments to the incident signal corresponds to a metal pattern size to achieve transmission gain and focusing gain relative to Low-E glass. The gain of the high-gain metasurface array to the incident signal can be expressed as:

[0038] Gain = G t +G f ,

[0039] Among them G t is the transmission gain, G f is the focus gain.

[0040] In one embodiment of the present invention, the high-gain metasurface achieves enhancement of the incident signal in the near-field region, meeting the requirements for signal control in a confined space.

[0041] In one embodiment of the present invention, the high-gain metasurface is attached to glass and has a design that is compatible with any existing glass surface. It is suitable for glass that has been put into use, and the system is suitable for all 5G frequency bands such as N78 and N79.

[0042] According to a third aspect of an embodiment of the present invention, there is also provided a computer-readable storage medium having computer executable instructions stored thereon, which, when executed by a processor, can implement the method for improving the wireless communication throughput rate within a 5G limited space as described above.

[0043] Technical principle of the invention: The technical solution of the invention proposes a wireless communication system within a confined space, which realizes signal enhancement in a confined space by designing a high-gain metasurface applied in the near field range, and realizes signal coverage of the entire confined space by deploying CPE (Customer Premises Equipment) in the area. The designed high-gain metasurface can take into account the regulation of the amplitude and phase of the signal, and at the same time achieves high-gain effects of transmission gain and focusing gain, which can effectively improve the throughput of the communication system.

[0044] Beneficial effect: The throughput improvement method proposed in the present invention establishes a connection between the gain of the incident signal by the metasurface and the throughput in the actual communication system, that is, the metasurface optimizes the channel quality by improving the signal strength received by the CPE, thereby expanding the optional modulation and coding schemes of the incident signal and improving the achievable throughput of the system. In addition, the present invention also proposes a wireless communication system within a confined space, including a micro base station, a high-gain metasurface and a CPE, wherein the high-gain metasurface based on glass design can take into account the amplitude and signal regulation of the incident signal, and achieve a high gain effect of comprehensive transmission gain and focusing gain. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0046] Figure 1This is a model diagram of a 5G indoor confined space wireless communication system provided in Example 1 of the present invention.

[0047] Figure 2 This is a flow chart of a method for improving the 5G wireless communication throughput rate within an indoor confined space provided in Example 1 of the present invention.

[0048] Figure 3 It is a high-gain metasurface unit structure designed by the present invention. Figure 3 a is the overall structure of the metasurface unit, Figure 3 b and Figure 3 c is the metal layer structure of the supersurface unit.

[0049] Figure 4 It is the metal layer structure of the high-gain metasurface array designed by the present invention, Figure 4 a is the first and third metal structures of the metasurface array, Figure 4 b is the second layer metal structure of the metasurface array.

[0050] Figure 5 It is a relationship diagram between the system BLER and the SNR in the environment in the indoor communication scenario of the present invention.

[0051] Figure 6 This is a performance diagram of the high-gain metasurface designed in the present invention for incident signal gain as the distance away from the direction perpendicular to the metasurface increases.

[0052] Figure 7 It is a performance diagram of the system real-time throughput and environmental SNR in the indoor communication scenario of the present invention.

[0053] Figure 8 This is a model diagram of the 5G high-speed rail wireless communication system provided in Example 2 of the present invention.

[0054] Fig. 9 This is a flow chart of a method for improving the wireless communication throughput rate in 5G high-speed railways provided in Embodiment 2 of the present invention.

[0055] Fig.10 It is a relationship diagram between the system BLER and the SNR in the environment in the high-speed rail communication scenario of the present invention.

[0056] Fig.11 It is a performance diagram of the system real-time throughput and environmental SNR in the high-speed rail communication scenario of the present invention. DETAILED DESCRIPTION

[0057] In order to make the purpose, working principle and technical solution of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0058] It should be understood that the wireless communication system of the embodiment of the present application can be applied to various confined space scenarios including glass, such as: indoor space communication scenarios, subway communication scenarios, high-speed rail communication scenarios, etc.

[0059] The present invention provides a method for improving the throughput of wireless communication in a 5G limited space. According to the 3GPP protocol, in the throughput improvement method, the throughput that can be achieved by the channel is expressed as:

[0060]

[0061] The 5G signal with the number of aggregated carriers J as 1, the number of resource blocks N=273, the overhead OH as 0.14, the number of MIMO layers v=1, the average duration of OFDM symbols Ts=0.035ms, and the uplink and downlink symbol ratio f=0.9 is selected as the micro base station signal. The throughput improvement method includes the micro base station sending a signal, the high-gain metasurface improving the channel quality of the metasurface to the CPE link by regulating the incident signal, and after the CPE receives the signal, the current channel state information is fed back to the micro base station through the uplink, and the micro base station optimizes the data transmission strategy according to the current channel quality to improve the system achievable throughput;

[0062] The optimized data transmission strategy relies on the dynamic adjustment of the modulation and coding scheme for sending 5G signals by the micro base station. On the basis of ensuring that the BLER of the communication system does not exceed the system minimum requirement of 10%, the signal configuration is optimized to achieve the maximum throughput rate under the current channel.

[0063] Embodiment 1:

[0064] like Figure 1 As shown, an indoor wireless communication system used in the present invention includes a micro base station, a high-gain metasurface and a CPE. There is no direct transmission link between the micro base station and the CPE. The micro base station and the CPE are respectively located on both sides of the high-gain metasurface. The high-gain metasurface unit can realize the regulation of the amplitude and phase of the incident electromagnetic wave signal.

[0065] like Figure 2 As shown, the implementation steps of the present invention are as follows:

[0066] S101: The micro base station sends a 5G signal;

[0067] S102: The high-gain metasurface regulates the amplitude and phase of the incident signal to achieve high signal gain that takes into account both transmission gain and focusing gain in a limited area of ​​the near field;

[0068] Furthermore, the high-gain metasurface in step S102 includes an array of 40×40 metasurface units, and the unit structure is as follows: Figure 3As shown in a, its design is based on Low-E (low-emissivity) glass and is suitable for the 5GN79 frequency band. Each metasurface unit is composed of a metal layer and a dielectric layer. The metal layer includes: a first metal layer 1, a second metal layer 2 and a third metal layer 3. The dielectric layer includes: a first dielectric layer 4 and a second dielectric layer 5. The first metal layer 1, the first dielectric layer 4, the second metal layer 2, the second dielectric layer 5 and the third metal layer 3 are arranged in sequence from top to bottom.

[0069] The high-gain metasurface unit is in the shape of a square with a side length of 12 mm. The first metal layer 1 and the third metal layer 3 have the same shape and size. The metal layer pattern used includes Figure 3 The metal pattern in the shape of a circle as shown in b Figure 3 c shows a square-shaped metal pattern, that is, the first metal layer 1 and the third metal layer 3 of each type of super surface unit are one of a square-shaped metal pattern and a square-shaped metal pattern, and the metal patterns in the first metal layer 1 and the third metal layer 3 are aligned and overlapped, and the pattern of the second metal layer 2 is Figure 3 c shows a U-shaped metal pattern, the metal pattern layer is symmetrical about the unit center, attached to the dielectric layer, with a thickness of 50 microns, the first dielectric layer 4 and the second dielectric layer 5 have the same shape and size, the dielectric material is PMMA (polymethyl methacrylate), and the thickness is 1 mm.

[0070] The high-gain metasurface unit can control the amplitude and phase of the incident signal by adjusting the size of the square ring inside the U-shaped metal pattern in the first and third metal layers or the size of the square ring in the U-shaped metal pattern.

[0071] Based on the high-gain metasurface unit, the present invention designs a high-gain metasurface array, the size of the array is 480mm×480mm, and is formed by 40×40 high-gain metasurface units according to the expected amplitude and phase distribution, that is, each unit with different amplitude and phase adjustments to the incident signal corresponds to a metal pattern size, wherein Figure 4 a is the structure of the first metal layer and the third metal layer, Figure 4 b is the structure of the second metal layer. The high-gain metasurface can simultaneously achieve transmission gain and focusing gain relative to Low-E glass. The gain of the high-gain metasurface array to the incident signal can be expressed as:

[0072] Gain = G t +G f ,

[0073] Among them G t is the transmission gain, G f The gain of the incident signal by the metasurface enhances the SNR in a limited area of ​​the near field. In addition, the designed high-gain metasurface array has a high transmittance of 80.4%.

[0074] S103: After the CPE is deployed in the near-field limited area to receive the enhanced incident signal, the CPE radiates again to achieve signal coverage of the entire limited space. At the same time, the CPE feeds back channel status information to the micro base station based on the received signal quality;

[0075] Furthermore, the feedback process of the CPE on the channel status in step S103 is as follows:

[0076] After receiving the signal enhanced by the metasurface, the CPE feeds back the current channel status information to the micro base station through the uplink.

[0077] S104: The micro base station dynamically adjusts the modulation and coding scheme of its transmitted signal according to the received channel state information, thereby achieving a higher system achievable throughput rate;

[0078] Furthermore, in step S104, the dynamic adjustment process of the micro base station to the incident signal is as follows:

[0079] Micro base station Figure 5 The relationship between the BLER of the communication system and the SNR at the receiving end is shown, which ensures that the communication system meets the minimum requirement of BLER not exceeding 10% to maintain normal communication. The micro base station dynamically adjusts the modulation and coding scheme of the transmitted signal, selects the highest modulation and coding scheme that meets the system requirements, increases the amount of information carried by the signal, and achieves the maximum throughput under the current channel state.

[0080] S105: The CPE re-radiates the signal adjusted by the micro base station to the limited space to achieve signal coverage of the entire space;

[0081] Furthermore, the high-gain metasurface can only achieve signal enhancement in a limited near-field area. By deploying CPE in the signal enhancement area, signal coverage of the entire space can be achieved, thereby improving the real-time throughput of the interaction between users and CPE in a limited space.

[0082] The present embodiment is further described below based on simulation results:

[0083] See also Figure 6 , the designed amplitude and phase controlled high-gain metasurface based on Low-E glass is simulated. Compared with the Low-E glass without high-gain metasurface, the incident signal has a signal gain of more than 15dB within 100mm to 150mm in the vertical direction of the metasurface after passing through the high-gain metasurface. Simulating the actual 5G communication system, Figure 7The maximum throughput that can be achieved by the signal sent by the micro base station based on the channel state when the user is in different environmental SNRs is given. When the environmental SNR is low, corresponding to the high penetration loss of the 5G signal entering the room, in order to meet the minimum BLER requirement of the communication system, the incident signal only supports low-order modulation and coding schemes, and the achievable throughput of the system is limited. The method and related system for improving the throughput of wireless communication in a 5G limited space, by introducing a high-gain metasurface, improves the SNR in a limited near-field area, optimizes the channel state, and expands the selectable modulation and coding schemes of the micro base station while meeting the minimum BLER requirement of the communication system, thereby effectively improving the maximum achievable throughput of the system; based on Figure 7 The relationship between the maximum achievable throughput of the system and the environmental SNR is given. The designed high-gain metasurface has a maximum gain of 15dB. When the initial SNR in the environment is 10dB, the system throughput is increased by 2.1 times.

[0084] Embodiment two:

[0085] The present invention provides a method for improving the throughput of wireless communication in a 5G limited space. According to the 3GPP protocol, in the throughput improvement method, the throughput that can be achieved by the channel is expressed as:

[0086]

[0087] The throughput improvement method includes the following steps: the micro base station sends a signal, the high-gain metasurface improves the channel quality of the metasurface to CPE link by regulating the incident signal, and after the CPE receives the signal, the current channel state information is fed back to the micro base station through the uplink, and the micro base station optimizes the data transmission strategy according to the current channel quality to improve the achievable throughput of the system;

[0088] The optimized data transmission strategy relies on the dynamic adjustment of the modulation and coding scheme for sending 5G signals by the micro base station. On the basis of ensuring that the BLER of the communication system does not exceed the system minimum requirement of 10%, the signal configuration is optimized to achieve the maximum throughput rate under the current channel.

[0089] like Figure 8 As shown, another high-speed rail wireless communication system used in the present invention includes a micro base station, a high-gain metasurface and a CPE. The micro base station sends a signal through the metasurface attached to the glass to the CPE on the other side. The micro base station and the CPE are respectively located on both sides of the high-gain metasurface. The high-gain metasurface unit can realize the regulation of the amplitude and phase of the incident electromagnetic wave signal.

[0090] like Fig. 9 As shown, the implementation steps of the present invention are as follows:

[0091] S201: The micro base station sends a 5G signal;

[0092] S202: The high-gain metasurface regulates the amplitude and phase of the incident signal and focuses the incident signal on the CPE on the other side; after receiving the enhanced incident signal, the CPE achieves signal coverage in the entire limited space; in addition, the CPE sends channel status information back to the micro base station through the uplink based on the received signal quality;

[0093] S203: The micro base station dynamically adjusts the modulation and coding scheme of its transmitted signal according to the received channel state information, so that the transmitted signal can carry more information, thereby improving the achievable throughput performance of the wireless communication system.

[0094] S204: The CPE re-radiates the signal adjusted by the micro base station to the limited space, thereby achieving signal coverage of the entire space and improving the real-time throughput of the interaction between the user and the CPE in the limited space.

[0095] Compared with indoor scenarios, high-speed rail scenarios are communication scenarios with worse signal quality. The SNR in the carriage is often lower. Fig.10 The relationship between the BLER of the communication system and the SNR at the receiving end is given when the SNR is low. At this time, the modulation and coding schemes available to the system are limited, and the achievable system throughput is low.

[0096] The method for improving the wireless communication throughput rate in a 5G confined space and the related system provided by the embodiment of the present invention include: a micro base station sends a 5G signal; a high-gain metasurface regulates the amplitude and phase of the incident signal, and focuses the incident signal on the CPE on the other side; after receiving the enhanced signal, the CPE achieves signal coverage in the entire confined space; in addition, the CPE sends channel status information back to the micro base station through the uplink based on the received signal quality; the micro base station dynamically adjusts the modulation and coding scheme of its transmitted signal according to the received channel status information, so that the signal it sends can carry more information, thereby improving the achievable throughput performance of the wireless communication system. Fig.11 The maximum throughput that can be achieved by the signal sent based on the channel state under different environmental SNRs is given. Considering a high-gain metasurface with a gain of 15dB, when the initial SNR in the environment is -6dB, the system throughput can be increased by about 10 times. Compared with the prior art, the second embodiment of the present invention effectively improves the 5G real-time throughput of users in a limited space in a high-speed rail through a near-field high-gain metasurface and CPE.

[0097] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

A method for improving wireless communication throughput in a 1.5G limited space, characterized in that: According to the 3GPP protocol, in the throughput improvement method, the achievable throughput of the channel is expressed as: Where J is the number of aggregated carriers, N is the number of resource blocks, OH is the overhead, v is the number of MIMO layers, Ts is the average duration of OFDM symbols, f is the uplink and downlink symbol ratio, Q is the modulation order, and R is the coding efficiency. The modulation order Q and the coding efficiency R are related, and the two are collectively called the modulation and coding scheme; The throughput improvement method includes the following steps: the micro base station sends a signal, the high-gain metasurface improves the channel quality of the metasurface to CPE link by regulating the incident signal, and after the CPE receives the signal, the current channel state information is fed back to the micro base station through the uplink, and the micro base station optimizes the data transmission strategy according to the current channel quality to improve the achievable throughput of the system; The optimized data transmission strategy relies on the dynamic adjustment of the modulation and coding scheme for sending 5G signals by the micro base station. On the basis of ensuring that the block error rate of the communication system does not exceed the system minimum requirement of 10%, the signal configuration is optimized to achieve the maximum throughput rate under the current channel.

2. The method for improving the wireless communication throughput rate in a 5G limited space according to claim 1, characterized in that: The specific operation steps of applying the throughput improvement method to indoor wireless communication include: S101: The micro base station sends a 5G signal; S102: The high-gain metasurface regulates the amplitude and phase of the incident signal to achieve high signal gain that takes into account both transmission gain and focusing gain in a limited area of ​​the near field; The high-gain metasurface in step S102 comprises an array of 40×40 metasurface units, the design of the metasurface units is based on Low-E glass and is suitable for the 5GN79 frequency band, each of the metasurface units is composed of a metal layer and a dielectric layer, the metal layer comprises: a first metal layer (1), a second metal layer (2) and a third metal layer (3), the dielectric layer comprises: a first dielectric layer (4) and a second dielectric layer (5); the first metal layer (1), the first dielectric layer (4), the second metal layer (2), the second dielectric layer (5) and the third metal layer (3) are arranged in sequence from top to bottom; The high-gain metasurface unit is in the shape of a square with a side length of 12 mm. The first metal layer (1) and the third metal layer (3) are in the same shape and size. The metal layer patterns used include a Chinese-shaped metal pattern and a square-shaped metal pattern. That is, the first metal layer (1) and the third metal layer (3) of each type of metasurface unit are one of the Chinese-shaped metal pattern and the square-shaped metal pattern, and the metal patterns in the first metal layer (1) and the third metal layer (3) are aligned and overlapped. The pattern of the second metal layer (2) is a square-shaped metal pattern. The metal pattern layer is symmetrical about the unit center, attached to the dielectric layer, and has a thickness of 50 microns. The first dielectric layer (4) and the second dielectric layer (5) are in the same shape and size. The dielectric material is PMMA, and has a thickness of 1 mm. The high-gain metasurface unit can adjust the size of the square ring inside the U-shaped metal pattern in the first and third metal layers or the size of the square ring in the U-shaped metal pattern to achieve amplitude and phase control of the incident signal; The size of the high-gain metasurface is 480 mm×480 mm, and is formed by 40×40 high-gain metasurface units according to the expected amplitude and phase distribution, that is, each unit with different amplitude and phase adjustments to the incident signal corresponds to a metal pattern size to achieve transmission gain and focusing gain relative to Low-E glass. The gain of the high-gain metasurface array to the incident signal can be expressed as: Gain=G t +G f , Among them G t is the transmission gain, G f To focus the gain, the metasurface’s gain on the incident signal enhances the SNR in a limited area of ​​the near field. In addition, the designed high-gain metasurface array has a high light transmittance of 80.4%; S103: After the CPE is deployed in the near-field limited area to receive the enhanced incident signal, the CPE radiates again to achieve signal coverage of the entire limited space. At the same time, the CPE feeds back channel status information to the micro base station based on the received signal quality; The feedback process of the CPE to the incident signal in step S103 is as follows: After receiving the signal enhanced by the metasurface, the CPE feeds back the current channel status information to the micro base station through the uplink; S104: The micro base station dynamically adjusts the modulation and coding scheme of its transmitted signal according to the optimized channel state, thereby achieving a higher system achievable throughput rate; The dynamic adjustment process of the micro base station to the incident signal in step S104 is as follows: Based on the relationship between the BLER of the communication system and the SNR of the receiving end, the micro base station ensures that the communication system meets the minimum requirement of BLER not exceeding 10% to maintain normal communication. The micro base station dynamically adjusts the modulation and coding scheme of the transmitted signal, selects the highest modulation and coding scheme that meets the system requirements, increases the amount of information carried by the signal, and achieves the maximum throughput rate under the current channel state; S105: The CPE re-radiates the signal adjusted by the micro base station to the limited space to achieve signal coverage of the entire space.

3. The method for improving the wireless communication throughput rate in a 5G limited space according to claim 1, characterized in that: The specific operation steps of applying the throughput improvement method to high-speed rail wireless communication include: S201: The micro base station sends a 5G signal; S202: The high-gain metasurface regulates the amplitude and phase of the incident signal and focuses the incident signal on the CPE on the other side. After receiving the enhanced signal, the CPE achieves signal coverage in the entire limited space. In addition, the CPE sends channel status information back to the micro base station through the uplink based on the received signal quality. S203: The micro base station dynamically adjusts the modulation and coding scheme of its transmitted signal according to the received channel state information, so that the transmitted signal can carry more information, thereby improving the throughput performance achievable by the wireless communication system; S204: The CPE re-radiates the signal adjusted by the micro base station to the limited space, thereby achieving signal coverage of the entire space and improving the real-time throughput of the interaction between the user and the CPE in the limited space. The 4.5G wireless communication throughput improvement system within a limited space is characterized by: It includes a micro base station, a high-gain metasurface and a CPE; the micro base station is used to send 5G signals and dynamically adjust the modulation and coding scheme of the sent signal through the channel state information fed back by the CPE to achieve a higher system achievable throughput; the high-gain metasurface is attached to the glass to enhance the strength and channel quality of the wireless signal in the effective area; the CPE is deployed in the limited area to achieve signal coverage in the entire space and interact with data with terminal users.

5. The 5G limited space wireless communication throughput improvement system according to claim 4, characterized in that: The high-gain metasurface includes an array composed of N×N metasurface units, the design of the metasurface unit is based on Low-E glass, and is suitable for the 5G frequency band. Each of the metasurface units is composed of a metal layer and a dielectric layer. The metal layer includes: a first metal layer, a second metal layer, and a third metal layer. The dielectric layer includes: a first dielectric layer and a second dielectric layer. The first metal layer, the first dielectric layer, the second metal layer, the second dielectric layer, and the third metal layer are arranged in sequence from top to bottom. The high-gain metasurface unit is in a square shape, the side length of the unit is p, the first metal layer and the third metal layer are in the same shape and size, the metal layer patterns used include a Chinese-shaped metal pattern and a Chinese-shaped metal pattern, that is, the first metal layer and the third metal layer of each type of metasurface unit are one of the Chinese-shaped metal pattern and the Chinese-shaped metal pattern, and the metal patterns in the first metal layer and the third metal layer are aligned and overlapped, the second metal layer pattern is a Chinese-shaped metal pattern, the metal pattern layer is symmetrical about the unit center, attached to the dielectric layer, and has a thickness of 50 microns, the first dielectric layer and the second dielectric layer are in the same shape and size, the dielectric material is PMMA, and the thickness is 1 mm; The high-gain metasurface unit can adjust the size of the square ring inside the U-shaped metal pattern in the first and third metal layers or the size of the square ring in the U-shaped metal pattern to achieve amplitude and phase control of the incident signal.

6. The 5G limited space wireless communication throughput improvement system according to claim 4, characterized in that: The high-gain metasurface is formed by N×N high-gain metasurface units according to the expected amplitude and phase distribution, that is, each unit with different amplitude and phase adjustments to the incident signal corresponds to a metal pattern size to achieve transmission gain and focusing gain relative to Low-E glass. The gain of the high-gain metasurface array to the incident signal can be expressed as: Gain=G t +G f , Among them G t is the transmission gain, G f is the focus gain.

7. The 5G limited space wireless communication throughput improvement system according to claim 4, characterized in that: The high-gain metasurface achieves enhancement of the incident signal in the near-field region, meeting the requirements for signal control in a confined space.

8. The 5G limited space wireless communication throughput improvement system according to claim 4, characterized in that: The high-gain metasurface is attached to glass and has a compatible design with any existing glass surface. It is suitable for glass that has been put into use. The system is suitable for all 5G frequency bands such as N78 and N79.

9. A computer-readable storage medium having computer-executable instructions stored thereon, characterized in that: When the executable instructions are executed by the processor, the method for improving the wireless communication throughput rate within a 5G limited space as described in any one of claims 1 to 3 is implemented.

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