Cross-polarized leaky cable communication coverage system

Abstract

The present application relates to the technical field of wireless communications, and provides a cross-polarized leaky cable communication coverage system, comprising a transparent-transmission POI capable of achieving transparent transmission of signals having a low working frequency and reducing the number of low-frequency-band signal sources, thereby lowering the construction investment and achieving the purposes of reducing the construction cost, shortening a construction period, improving the construction safety and reducing the maintenance difficulty. In addition, a cross-polarized leaky cable group signaled between a conventional POI and a transparent-transmission POI which are adjacent to each other is provided. On one hand, the installation space of leaky cables is reduced, and a space is provided for the arrangement of more leaky cables; and on the other hand, the cross-polarized leaky cables reduce the coherence of signals, form a channel condition beneficial to multi-stream signal transmission, improve the access number of users, and improve the communication quality.

Description

A cross-polarization leaky cable communication coverage system Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a cross-polarization leaky cable communication coverage system. Background Art

[0002] In narrow, confined indoor environments, network coverage is typically achieved by deploying leaky cables. Multiple-input, multiple-output (MIMO) is a crucial technology in 5G communications, significantly increasing channel capacity. Multiple antennas are used at both the transmitter and receiver ends, creating a multi-channel transmission system. Currently, MIMO is implemented using multiple leaky cables. However, because the four leaky cables use the same polarization, if the spacing between the cables does not meet the required spatial isolation, MIMO capacity will be severely impacted.

[0003] In addition, in the existing leaky cable communication systems in narrow and long areas (such as subways, high-speed railways, highways, etc.), since the leaky cable is compatible with a wide frequency and a large span, there is a situation of weak coverage of high-frequency signals and over-coverage of low-frequency signals. For the low-frequency band, its transmission loss is small and there is a large margin.

[0004] Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide a cross-polarization leaky cable communication coverage system.

[0006] In the first aspect, the present application provides a cross-polarization leaky cable communication coverage system, comprising conventional POIs and transparent transmission POIs arranged at intervals, and a cross-polarization leaky cable group whose signals are connected between adjacent conventional POIs and transparent transmission POIs, wherein the cross-polarization leaky cable group comprises at least two leaky cables arranged side by side, and the radiation polarization directions of the two adjacent leaky cables are different; the transparent transmission POI does not inject signals with a frequency below 1700 MHz, and the transparent transmission POI can directly output signals with a frequency below 1700 MHz received from the cross-polarization leaky cable group of the upper level to the cross-polarization leaky cable group of the next level.

[0007] In some embodiments, the radiation polarization directions of the leaky cables in the cross-polarization leaky cable group are alternately arranged in a horizontal polarization and a vertical polarization manner.

[0008] In some embodiments, the radiation polarization direction of each leaky cable in the cross-polarization leaky cable group is vertical polarization, horizontal polarization, +45° polarization or -45° polarization.

[0009] In some embodiments, the slots of the leaky cables in the cross-polarization leaky cable group are arranged at different periods.

[0010] In some embodiments, at least two slot groups with different polarizations are provided on the same leaky cable in the cross-polarization leaky cable group, and the slot groups with different polarizations are arranged at intervals; the polarization modes of the slot groups at the same corresponding longitudinal positions of any two adjacent leaky cables in the cross-polarization leaky cable group are different; the transmission loss of the two adjacent slot groups with different polarizations on the same leaky cable differs by no more than 3dB / 100m, the coupling loss differs by no more than 5dB, and the radiation system loss is no more than 7dB.

[0011] In some embodiments, the conventional POI includes a first heterofrequency combiner, a second heterofrequency combiner, a first bridge, a first output port and a second output port, the input ends of the first heterofrequency combiner and the second heterofrequency combiner are connected to the signal source to be combined, the output ends of the first heterofrequency combiner and the second heterofrequency combiner are connected to the first bridge, and the first bridge is connected to the first output port and the second output port; the transparent transmission POI includes a third heterofrequency combiner, a fourth heterofrequency combiner, a second bridge, a first end combiner, a second end combiner, a third output port and a fourth output port, the first heterofrequency combiner and the second heterofrequency combiner are connected to the first bridge, and the first bridge is connected to the first output port and the second output port. The input ends of the third and fourth different-frequency combiners are connected to a signal source with a frequency greater than 1700 MHz, and the output ends of the third and fourth different-frequency combiners are connected to the second bridge; the first output end of the second bridge is connected to the first end combiner, and the second output end of the second bridge is connected to the second end combiner. The first end combiner and the second end combiner both include a low-frequency end, and the low-frequency end of the first end combiner is connected to the low-frequency end of the second end combiner; the output end of the first end combiner is connected to the third output port, and the output end of the second end combiner is connected to the fourth output port.

[0012] In some embodiments, the conventional POI and the transparent transmission POI both include an inter-frequency combiner, a bridge, an end combiner and an output port. The inter-frequency combiner is connected between the 2G / 3G / 4G signal source to be combined and the bridge, the end combiner is connected between the bridge and the output port, and the 5G signal source is directly connected to the input end of the end combiner.

[0013] In some embodiments, an input terminal for signals with a frequency below 1700 MHz is provided on the terminal combiner in the transparent transmission POI, and the input terminals for signals with a frequency below 1700 MHz of the two terminal combiners are connected by a jumper.

[0014] In some embodiments, the end combiner in the transparent transmission POI includes a first input port, a second input port, a third input port, a fourth input port and a transparent transmission combining output port, wherein the first input port is used to input a source signal in the 2515-2675MHz frequency band, the second input port is used to input a source signal in the 3300-3700MHz frequency band, the third input port is used to input a frequency band signal below 1700MHz, the fourth input port is used to input a source signal in the 1710-2370MHz frequency band, and the transparent transmission combining output port is used to output a combined signal of the input signals of the first input port, the second input port, the third input port and the fourth input port.

[0015] In some embodiments, the end combiner in the conventional POI includes a fifth input port, a sixth input port, a seventh input port and a conventional combiner output port, the fifth input port is used to input a source signal in the 2515-2675MHz frequency band, the sixth input port is used to input a source signal in the 3300-3700MHz frequency band, the seventh input port is used to input a source signal in the 820-2370MHz frequency band, and the conventional combiner output port is used to output a combined signal of the input signals of the fifth input port, the sixth input port and the seventh input port.

[0016] The beneficial effects that this application can achieve.

[0017] The present application provides a cross-polarization leaky cable communication coverage system, which includes a transparent transmission POI that can transparently transmit frequency band signals with lower operating frequencies below 1700MHz (such as 2G standard signals), thereby reducing the number of low-frequency band signal sources, thereby reducing construction investment, achieving the purpose of saving construction costs, shortening construction period, improving construction safety and reducing maintenance difficulty. In addition, a cross-polarization leaky cable group is set up to connect the signals between the adjacent conventional POI and the transparent transmission POI. On the one hand, it saves the installation space of the leaky cable and provides space for arranging more leaky cables. On the other hand, the cross-polarization leaky cable reduces the coherence of the signal, forming a channel condition that is conducive to multi-stream signal transmission, increasing the number of user access, and improving the quality of communication.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] FIG1 shows a schematic diagram of the network structure of a cross-polarization leaky cable communication coverage system of the present application;

[0021] FIG2 shows a schematic diagram of cross-polarization of two leaky cables in a cross-polarization leaky cable communication coverage system of the present application;

[0022] FIG3 shows a schematic diagram of cross-polarization of four leaky cables in a cross-polarization leaky cable communication coverage system of the present application;

[0023] FIG4 shows a schematic structural diagram of a cross-polarization leaky cable communication coverage system with different leaky cable periods according to the present application;

[0024] FIG5 is a schematic structural diagram showing a cross-polarization leaky cable communication coverage system of the present invention, in which a plurality of slot groups with different polarizations are provided on a leaky cable;

[0025] FIG6 shows a schematic diagram of the principle of a 9-frequency conventional POI of a cross-polarization leaky cable communication coverage system of the present application;

[0026] FIG7 shows a schematic diagram showing the principle of a 9-frequency transparent transmission POI of a cross-polarization leaky cable communication coverage system of the present application;

[0027] FIG8 shows a schematic diagram showing the principle of a 5G conventional POI of a cross-polarization leaky cable communication coverage system of the present application;

[0028] FIG9 shows a schematic structural diagram of a conventional POI end combiner of a cross-polarization leaky cable communication coverage system of the present application.

[0029] FIG10 shows a schematic diagram showing the principle of a 5G transparent transmission POI of a cross-polarization leaky cable communication coverage system of the present application;

[0030] FIG11 shows a schematic structural diagram of a terminal combiner of a transparent transmission POI of a cross-polarization leaky cable communication coverage system of the present application;

[0031] Among them: 1-first conventional POI, 2-first transparent transmission POI, 3-second conventional POI, 4-first cross-polarization leaky cable group, 5-second cross-polarization leaky cable group, 6-first leaky cable, 7-second leaky cable, 8-third leaky cable, 9-fourth leaky cable, P1-first period, P2-second period, P3-third period, P4-fourth period, 10-9-frequency conventional POI, 11-first inter-frequency combiner, 12-second inter-frequency combiner, 13-first bridge, 14-9-frequency transparent transmission POI, 15-third inter-frequency Combiner, 16-Fourth frequency combiner, 17-Second bridge, 18-First end combiner, 19-Second end combiner, ANT1-First signal end, ANT2-Second signal end, 20-China Telecom CDMA800 signal source, 21-China Mobile GSM1800 signal source, 22-China Telecom FDD-LTE (1.8) signal source, 23-China Unicom WCDMA2100 signal source, 24-China Unicom LTE-FDD1.8G signal source or China Unicom GSM1800 signal source, 25-China Telecom LTE-FDD 2.1G signal source, 26-Mobile TD-LTE (F band) signal source, 27-Mobile TD-LTE (E band) signal source, 28-China Unicom / China Mobile GSM900 signal source, 29-China Mobile NR2.6G signal source, 30-China Unicom / China Telecom NR3.5G signal source, 31-Fifth inter-frequency combiner, 32-Sixth inter-frequency combiner, 33-Third bridge, 34-Third terminal combiner, 35-Fourth terminal combiner, 36-5G conventional POI, 37-5G transparent transmission POI, 38-Seventh inter-frequency combiner Device, 39-eighth frequency combiner, 40-fourth bridge, 41-fifth end combiner, 42-sixth end combiner, 43-first input port, 44-second input port, 45-third input port, 46-fourth input port, 47-transparent transmission combining output port, 48-fifth input port, 49-sixth input port, 50-seventh input port, 51-conventional combining output port, 52-first output port, 53-second output port, 54-third output port, 55-fourth output port. DETAILED DESCRIPTION

[0032] The term "comprising" in the specification, claims, and drawings of this application is synonymous with "including," "containing," or "characterized by," and is inclusive or open-ended and does not exclude additional unrecited elements or method steps. "Comprising" is a technical term used in claim language to mean that the recited elements are present, but other elements may be added and still form a structure or method within the scope of the claim.

[0033] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance. The term "about" in this application is meant to include slight variations (up to + / - 10%) from the stated value.

[0034] In this application, it has been found that in the existing leaky cable communication system in narrow and long areas (such as subways, high-speed railways, highways, etc.), due to the wide frequency compatibility and large span of the leaky cable, there is a situation of weak coverage of high-frequency signals and over-coverage of low-frequency signals. For the low-frequency band, its transmission loss is small and there is a large margin. In addition, in 5G communication, multiple-input multiple-output (MIMO) is an extremely important technology that can greatly improve the channel capacity. Multiple antennas are used at both the transmitting and receiving ends to form a transmission system with multiple channels between the transmitting and receiving ends. At present, multiple leaky cables are used to implement MIMO. However, since the four leaky cables use the same polarization mode, when the spacing between the leaky cables does not meet the spatial isolation requirements, it will seriously affect the MIMO capacity.

[0035] Therefore, an embodiment of the present application provides a cross-polarization leaky cable communication coverage system, including conventional POIs and transparent transmission POIs arranged at intervals, and a cross-polarization leaky cable group whose signals are connected between adjacent conventional POIs and transparent transmission POIs, wherein the cross-polarization leaky cable group includes at least two leaky cables arranged side by side, and the radiation polarization directions of the two adjacent leaky cables are different; the transparent transmission POI does not inject signals with a frequency below 1700 MHz, and the transparent transmission POI can directly output the signal with a frequency below 1700 MHz received from the cross-polarization leaky cable group of the upper level to the cross-polarization leaky cable group of the next level. The communication system in this embodiment includes a transparent transmission POI that can transparently transmit signals with lower operating frequencies below 1700 MHz (e.g., 2G standard signals), thereby reducing the number of low-frequency band signal sources, thereby reducing construction investment, achieving the goals of saving construction costs, shortening construction periods, improving construction safety, and reducing maintenance difficulties. In addition, a cross-polarized leaky cable group is provided between adjacent conventional POIs and transparent transmission POIs, which, on the one hand, saves installation space for leaky cables and provides space for arranging more leaky cables. On the other hand, the cross-polarized leaky cable reduces signal coherence, forming channel conditions that are conducive to multi-stream signal transmission, increasing the number of user access, and improving communication quality.

[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] Example 1

[0039] In narrow, enclosed indoor environments, network coverage is typically achieved by deploying leaky cables. These cables carry various signal standards, including 2G (China Telecom CDMA800, China Mobile / China Unicom GSM900, China Mobile / China Unicom DCS1800), 3G (China Mobile TD-SCDMA, China Unicom WCDMA, China Telecom CDMA2000), 4G (China Unicom FDD-LTE (1.8G), China Mobile TD-LTE (F), China Mobile TD-LTE (E), China Mobile TD-LTE (D), China Telecom FDD-LTE (1.8G), China Telecom FDD-LTE (2.1G), and 5G (China Mobile NR2.6, China Telecom / China Unicom NR3.5). These signal standards vary in frequency, and their transmission capabilities within the leaky cables vary. Generally, higher frequency signals have weaker transmission capabilities within the leaky cables, resulting in shorter coverage distances. For example, the commercial 5G frequency bands are divided into: China Mobile's 2515MHz-2675MHz, China Unicom's 3500MHz-3600MHz, and China Telecom's 3400MHz-3500MHz. China Mobile's 5G frequency bands are similar to those used by 4G; however, China Unicom and China Telecom's 5G frequencies are significantly higher than those of 2G, 3G, and 4G, resulting in relatively weaker signal coverage.

[0040] The signal source injects RF signals from one end of the leaky cable. After a certain distance of transmission attenuation, the signal gradually weakens until it attenuates to a point where it can no longer meet the coverage requirements. This distance is the effective coverage distance of the signal source.

[0041] The effective coverage distance of a general signal source is L = [Pin-(P0+L1+L2+L3+L4+L5)] / S meters.

[0042] Pin is the injected power at the input of the leaky cable; P0 is the minimum required coverage signal strength; L1 is the coupling loss of the leaky cable, which is related to the operating frequency band; L2 is the human body attenuation, which is related to the congestion level in the car and is generally set to 3-5dB; L3 is the width factor, which is generally set to Xlg(d / 2), where d is the distance between the terminal and the leaky cable, and X is the coefficient, generally between 10-20; L4 is the designed attenuation margin, which is generally set to 3dB; L5 is the body loss, which is related to the car type and is generally around 8-12dB for subway cars; S is the transmission loss per meter of the leaky cable, which is a leaky cable indicator and related to the operating frequency.

[0043] Table 1 below lists the maximum coverage distances (one-way) for major network standards in a leaky cable coverage system. It can be seen that low-frequency signals generally have strong coverage capabilities and long maximum coverage distances, while high-frequency signals have weak coverage capabilities and short maximum coverage distances. However, the specific requirements of 2G, 3G, 4G, and 5G signal standards for leaky cables, such as input power, transmission loss, coupling loss, and fringe field strength, vary, and the maximum coverage distance and frequency are not simply proportional. Overall, the maximum coverage distance of low-frequency 2G signals is approximately two to three times that of high-frequency 3G / 4G / 5G signals.

[0044] Table 1 List of the maximum coverage distances of major network standards in leaky cable coverage systems.

[0045] In this application, it has been found that in the existing leaky cable communication system in narrow and long areas (such as subways, high-speed railways, highways, etc.), due to the wide frequency compatibility and large span of the leaky cable, there is a situation of weak coverage of high-frequency signals and over-coverage of low-frequency signals. For the low-frequency band, its transmission loss is small and there is a large margin. In addition, in 5G communication, multiple-input multiple-output (MIMO) is an extremely important technology that can greatly improve the channel capacity. Multiple antennas are used at both the transmitting and receiving ends to form a transmission system with multiple channels between the transmitting and receiving ends. At present, multiple leaky cables are used to implement MIMO. However, since multiple leaky cables use the same polarization mode, when the spacing between the leaky cables does not meet the spatial isolation requirements, it will seriously affect the MIMO capacity.

[0046] In view of this, the present application proposes a cross-polarization leaky cable communication coverage system, which uses POI (multi-system combining platform) to combine multi-band signal sources and connects the output port of the POI to the leaky cable, as shown in Figure 1, including a conventional POI (multi-system combining platform), a transparent transmission POI and a cross-polarization leaky cable group located between the conventional POI and the transparent transmission POI. The cross-polarization leaky cable group includes at least two leaky cables arranged side by side, and the radiation polarization directions of the two adjacent leaky cables are different. The first end signal of the leaky cable in the cross-polarization leaky cable group is connected to the conventional POI, and the second end signal of the leaky cable in the cross-polarization leaky cable group is connected to the transparent transmission POI.

[0047] As shown in Figure 1, the system includes a first conventional POI 1, a first transparent POI 2, a second conventional POI 3, a first cross-polarization leaky cable group 4 located between the first conventional POI 1 and the first transparent POI 2, and a second cross-polarization leaky cable group 5 located between the first transparent POI 2 and the second conventional POI 3. The first cross-polarization leaky cable group 4 includes at least two leaky cables arranged side by side, with each adjacent leaky cable having different radiation polarization directions. The first end of the first cross-polarization leaky cable group 4 is signal-connected to the first conventional POI 1, and the second end of the first cross-polarization leaky cable group 4 is signal-connected to the first transparent POI 2. The second cross-polarization leaky cable group 5 includes at least two leaky cables arranged side by side, with each adjacent leaky cable having different radiation polarization directions. The first end of the second cross-polarization leaky cable group 5 is signal-connected to the first transparent POI 2, and the second end of the second cross-polarization leaky cable group 5 is signal-connected to the second conventional POI 3. Figure 1 only shows a structural diagram of a section of a cross-polarization leaky cable communication coverage system. Two cross-polarization leaky cable groups are connected to the first conventional POI1 and the second conventional POI3. The conventional POI and the transparent transmission POI are arranged at intervals, and the cross-polarization leaky cable group is arranged between the conventional POI and the transparent transmission POI for signal connection.

[0048] In some embodiments, the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 may each include two leaky cables to form a 2×2 MIMO system.

[0049] In some embodiments, the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 may each include four leaky cables to form a 4×4 MIMO system.

[0050] In some embodiments, the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 may each include 8 leaky cables to form an 8×8 MIMO system.

[0051] During specific implementation, the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 may be adjusted and set according to the signal coverage requirements of the deployment environment, the deployment cost restrictions, or the space allowed in the deployment scene. For example, the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 may also include 3 leaky cables, 5 leaky cables, 6 leaky cables, 7 leaky cables, 9 leaky cables, 10 leaky cables, and the like.

[0052] In order to construct orthogonally polarized leaky cables and thereby reduce the correlation of signals between leaky cables, in some embodiments, the radiation polarization directions of the leaky cables in the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 are arranged alternately in horizontal polarization and vertical polarization. Taking a 2×2 MIMO system as an example, the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 each includes two leaky cables arranged side by side, namely a first leaky cable 6 and a second leaky cable 7, and the radiation polarization directions of the first leaky cable 6 and the second leaky cable 7 are different. For example, in some embodiments, as shown in FIG2 , the first leaky cable 6 is a horizontally polarized leaky cable, and the second leaky cable 7 is a vertically polarized leaky cable, thereby reducing the signal correlation between the leaky cables and reducing the minimum distance between the leaky cables from four wavelengths to two wavelengths. For example, in the 1.8 GHz frequency band, the minimum distance between two co-polarized leaky cables is approximately 67 cm, while when two leaky cables with different polarizations are used, the minimum distance between the leaky cables is approximately 34 cm. For example, in the 2.4 GHz frequency band, the minimum distance between two co-polarized leaky cables is approximately 50 cm, while when two leaky cables with different polarizations are used, the minimum distance between the leaky cables is approximately 25 cm. In this embodiment, the radiation polarization directions of two adjacent leaky cables in the first cross-polarization leaky cable group 4 and the second cross-polarization leaky cable group 5 are different, and they are arranged alternately in a horizontal polarization and a vertical polarization manner. On the one hand, the installation space of the leaky cables is saved. In particular, in environments such as subway tunnels, in addition to communication leaky cables, the limited installation space of rail transit also needs to install a variety of cables and equipment such as subway-specific leaky cables, police leaky cables, and optical cable racks. In order to avoid interference, cables of different wireless communication systems also need to be installed at a certain distance. On the other hand, space is provided for arranging more leaky cables, thereby increasing the number of user access and improving the quality of communication.

[0053] In some embodiments, the polarization direction of the leaky cable is not limited to vertical polarization and horizontal polarization. For example, the radiation polarization direction of two adjacent leaky cables in the first cross-polarization leaky cable group 4 and the second cross-polarization leaky cable group 5 can be vertical polarization, horizontal polarization, +45° polarization, -45° polarization, +30° polarization, -30° polarization, +60° polarization, -60° polarization, +70° polarization or -70° polarization, etc. For example, as shown in FIG3 , in some embodiments, taking a 4×4 MIMO system as an example, the first cross-polarization leaky cable group 4 or the second cross-polarization leaky cable group 5 includes four leaky cables arranged side by side, namely, a first leaky cable 6, a second leaky cable 7, a third leaky cable 8, and a fourth leaky cable 9, and the radiation polarization directions of the first leaky cable 6, the second leaky cable 7, the third leaky cable 8, and the fourth leaky cable 9 are different. The first leaky cable 6 is a horizontally polarized leaky cable, the second leaky cable 7 is a vertically polarized leaky cable, the third leaky cable 8 is a +45° polarized leaky cable, and the fourth leaky cable 9 is a -45° polarized leaky cable. For example, in some embodiments, the first leaky cable 6 is a horizontally polarized leaky cable, the second leaky cable 7 is a +45° polarized leaky cable, the third leaky cable 8 is a vertically polarized leaky cable, and the fourth leaky cable 9 is a -45° polarized leaky cable. For example, in some embodiments, the first leaky cable 6 is a +30° polarized leaky cable, the second leaky cable 7 is a +45° polarized leaky cable, the third leaky cable 8 is a +60° polarized leaky cable, and the fourth leaky cable 9 is a +70° polarized leaky cable. Combinations of leaky cable polarization directions are not listed here one by one.

[0054] In some embodiments, to achieve better isolation between the individual leaky cables in the first cross-polarization leaky cable group 4 and the second cross-polarization leaky cable group 5 and reduce interference from the leaky cable radiation signals, the slot period of each leaky cable in the first cross-polarization leaky cable group 4 and the second cross-polarization leaky cable group 5 is set to be different, thereby further enhancing the signal isolation between the two leaky cables. For example, if the first leaky cable 6 and the third leaky cable 8 are horizontally polarized, and the second leaky cable 7 and the fourth leaky cable 9 are vertically polarized, the first period P1 of the slots of the first leaky cable 6 and the third period P3 of the slots of the third leaky cable 8 can be set to a stroke of 80 to 250 mm. The second period P2 of the slots of the second leaky cable 7 and the fourth period P4 of the slots of the fourth leaky cable 9 can be set to a stroke of 170 to 270 mm. For example, in some embodiments, as shown in FIG4 , the first period P1 of the slots of the first leaky cable 6 is set to 120 mm, the second period P2 of the slots of the second leaky cable 7 is set to 200 mm, the third period P3 of the slots of the third leaky cable 8 is set to 170 mm, and the fourth period P4 of the slots of the fourth leaky cable 9 is set to 260 mm.

[0055] In other embodiments, to facilitate process implementation and reduce process complexity, the first period P1 of the slots of the first leaky cable 6 and the third period P3 of the slots of the third leaky cable 8 may be set to be the same. The second period P2 of the slots of the second leaky cable 7 and the fourth period P4 of the slots of the fourth leaky cable 9 may be set to be the same. That is, the periods of the individual leaky cables within a cross-polarization leaky cable group do not necessarily have to be different. The periods of leaky cables with the same polarization direction may be set to be the same, while the periods of leaky cables with different polarization directions may be set to be different. In other embodiments, the periods of leaky cables with different polarization directions may also be set to be the same, while the periods of leaky cables with the same cross-polarization may be set to be different. In short, the periods of the slots of the individual leaky cables in the first cross-polarization leaky cable group 4 and the second cross-polarization leaky cable group 5 are not all set to be the same. Other possible embodiments will not be described in detail here.

[0056] Since the holding methods of user terminals are different, the reception effects of cross-polarization leaky cables are also different. In order to ensure the user experience of most customers, in some other embodiments, as shown in Figure 5, multiple slot groups with different polarizations can be opened on the same leaky cable in the first cross-polarization leaky cable group 4 and the second cross-polarization leaky cable group 5. The slots in the same slot group are arranged sequentially along the same radial area position in the length direction of the leaky cable, and the slot groups with different polarizations are arranged at intervals. The period of the slot groups with different polarizations is the same, but any two adjacent different leaky cables in the cross-polarization leaky cable group have different polarization modes at the same longitudinal corresponding position. In order to ensure the effect of the cross-polarization leaky cable, the transmission loss of the adjacent two different polarization slot groups on the same leaky cable differs by no more than 3dB / 100m, the coupling loss differs by no more than 5dB, and the radiation system loss is no more than 7dB. For example, as shown in FIG5 , two slot groups with different polarizations are provided on the same leaky cable, and the slot groups are arranged at intervals, and the periods of the slot groups are the same. A vertically polarized slot group and a horizontally polarized slot group are provided at intervals on each of the first leaky cable 6, the second leaky cable 7, the third leaky cable 8, and the fourth leaky cable 9, and the polarization modes of the slot groups at the same corresponding longitudinal positions of any two adjacent leaky cables are different.

[0057] In other embodiments of the present application, three, four, five, or six different polarization slot groups may be provided at intervals on the same leaky cable, and any two adjacent different leaky cables in a cross-polarized leaky cable group may have different polarization modes for the slot groups at the same corresponding longitudinal position. The radiation polarization direction may be, for example, vertical polarization, horizontal polarization, +45° polarization, -45° polarization, +30° polarization, -30° polarization, +60° polarization, -60° polarization, +70° polarization, or -70° polarization.

[0058] The multi-system combining platform (POI, PointOfInterface) serves as a bridge connecting the signal source and the distribution system. It is mainly used to combine the downlink signals, split the uplink signals of each subsystem, and suppress the useless interference components between the frequency bands as much as possible. The first conventional POI1 and the second conventional POI3 of the present application can be 9-band POI or 12-band POI, etc. The ports and supported frequency bands of the 9-band conventional POI are shown in Table 2 below. The ports and supported frequency bands of the 12-band conventional POI are shown in Table 3 below.

[0059] Table 2 is a list of ports and frequency bands for 9-band conventional POIs.

[0060] Table 3 shows the ports and supported frequency bands of the 12-band conventional POI.

[0061] The main principle of the first transparent transmission POI2 in this application is: receiving the low-frequency signal from the upper-level leaky cable, realizing signal transparent transmission through the low-frequency port of the internal combiner of the first transparent transmission POI2, and transmitting it to the next-level leaky cable for propagation. As shown in Figure 1, the low-frequency signal of the first transparent transmission POI2 access point comes from the full-band access points on both sides, while the high-frequency signal of the first transparent transmission POI2 access point still comes from the corresponding signal source injection of each operator. The use of transparent transmission POI can maximize the coverage capability of the low-frequency signal source and save the investment in low-frequency band signal source equipment. The transparent transmission POI described in this application does not inject signals with a frequency below 1700MHz. The transparent transmission POI can directly output the signal with a frequency below 1700MHz received from the cross-polarization leaky cable group of the upper level to the cross-polarization leaky cable group of the next level.

[0062] The first transparent transmission POI 2 can be a 9-frequency transparent transmission POI, a 12-frequency transparent transmission POI, etc. Table 4 below shows the ports and supported frequency bands of the 9-frequency transparent transmission POI. Table 5 shows the ports and supported frequency bands of the 12-frequency transparent transmission POI.

[0063] Table 4 lists the ports and frequency bands for the 9-band transparent transmission POI.

[0064] Table 5 lists the ports and supported frequency bands for the 12-band transparent transmission POI.

[0065] As shown in Figure 6, a schematic diagram of the structural principle of a 9-frequency conventional POI is shown. The 9-frequency conventional POI 10 includes a first inter-frequency combiner 11, a second inter-frequency combiner 12, a first bridge 13, a first output port 52 and a second output port 53. Signal sources of different standards and frequency bands are connected to the first inter-frequency combiner 11 or the second inter-frequency combiner 12, and the first inter-frequency combiner 11 and the second inter-frequency combiner 12 are connected to the first bridge 13. Signal sources of different standards and frequency bands, such as China Telecom CDMA800 signal source 20, China Mobile GSM1800 signal source 21, China Telecom FDD-LTE (1.8) signal source 22, China Unicom WCDMA2100 signal source 23, China Unicom LTE-FDD1.8G signal source or China Unicom GSM1800 signal source 24, China Telecom LTE-FDD2.1G signal source 25, China Mobile TD-LTE (F band) signal source 26, China Mobile TD-LTE (E band) signal source 27, and China Unicom / China Mobile GSM900 signal source 28. The inputs of the first and second inter-frequency combiners 11, 12 are connected to the signal sources to be combined. Multiple signal sources of different frequency bands are combined by the first and second inter-frequency combiners 11, 12 to form a first combined signal and a second combined signal. The outputs of the first and second inter-frequency combiners 11, 12 are connected to a first bridge 13, which then combines the first and second combined signals before outputting them. The first bridge 13 connects to a first output port 52 and a second output port 53, which are connected to a leaky cable via the output ports. As shown in Figure 6, ANT1 is the first signal terminal, connected to the previous level of leaky cable. ANT2 is the second signal terminal, connected to the next level of leaky cable.

[0066] FIG7 shows a schematic diagram of the structural principle of a nine-frequency transparent transmission POI. The nine-frequency transparent transmission POI 14 includes a third inter-frequency combiner 15, a fourth inter-frequency combiner 16, a second bridge 17, a first end combiner 18, a second end combiner 19, a third output port 54, and a fourth output port 55. A high-frequency signal source is connected to the third inter-frequency combiner 15 or the fourth inter-frequency combiner 16. The inputs of the third and fourth inter-frequency combiners 15 and 16 are connected to a signal source with a frequency greater than 1700 MHz. The combined outputs of the third and fourth inter-frequency combiners 15 and 16 are both connected to the second bridge 17. The first output of the second bridge 17 is connected to the first end combiner 18, and the second output of the second bridge 17 is connected to the second end combiner 19. The first-end combiner 18 and the second-end combiner 19 each include a low-frequency end, a high-frequency input end, and an output end. The high-frequency input ends of the first-end combiner 18 and the second-end combiner 19 are both connected to the high-frequency combined output of the second bridge 17. The low-frequency end of the first-end combiner 18 is connected to the low-frequency end of the second-end combiner 19. The output end of the first-end combiner 18 is connected to the third output port 54, and the output end of the second-end combiner 19 is connected to the fourth output port 55. The output end of the first-end combiner 18 is connected to the first signal terminal ANT1, and the output end of the second-end combiner 19 is connected to the second signal terminal ANT2. The first signal terminal ANT1 is connected to the upper-level leaky cable, and the second signal terminal ANT2 is connected to the lower-level leaky cable. High-frequency signal sources include, for example, a China Mobile GSM1800 signal source 21, a China Telecom FDD-LTE (1.8) signal source 22, a China Unicom WCDMA2100 signal source 23, a China Unicom LTE-FDD1.8G signal source or a China Unicom GSM1800 signal source 24, a China Telecom LTE-FDD2.1G signal source 25, a China Mobile TD-LTE (F-band) signal source 26, and a China Mobile TD-LTE (E-band) signal source 27. High-frequency signal source signals of multiple different frequency bands are combined by the third inter-frequency combiner 15 and the fourth inter-frequency combiner 16 to form a third combined signal and a fourth combined signal. The third combined signal and the fourth combined signal are then combined by the second bridge 17 and input to the high-frequency input terminal of the first end combiner 18 and the high-frequency input terminal of the second end combiner 19. The low-frequency signal from the first signal terminal ANT1 passes through the output terminal of the first end combiner 18 to the inside of the first end combiner 18, and then is transmitted to the low-frequency end of the second end combiner 19 through the low-frequency end of the first end combiner 18, and is combined with the high-frequency signal from the high-frequency input terminal of the second bridge 17 and output, thereby realizing transparent transmission of the low-frequency signal.

[0067] The first conventional POI1, the second conventional POI3, and the first transparent transmission POI2 in this application can also be customized according to the frequency band of the signal source. For example, in some embodiments, the signal sources are: China Telecom CDMA800 signal source 20, China Mobile GSM1800 signal source 21, China Telecom FDD-LTE (1.8) signal source 22, China Unicom WCDMA2100 signal source 23, China Unicom LTE-FDD1.8G signal source or China Unicom GSM1800 signal source 24, China Telecom LTE-FDD2.1G signal source 25, China Mobile TD-LTE (F band) signal source 26, China Mobile TD-LTE (E band) signal source 27, China Unicom / China Mobile GSM900 signal source 28, China Mobile NR2.6G signal source 29, China Unicom / China Telecom NR3.5G signal source 30. The 865-880MHz (downlink) / 820-835MHz (uplink) frequency bands of China Telecom's CDMA800 and the 934-960MHz (downlink) / 889-915MHz (uplink) frequency bands of China Unicom / China Mobile's GSM900 offer superior coverage compared to other high-frequency bands. Their maximum single-sided coverage distance is approximately 2-3 times that of other frequency bands. Transparent transmission POIs can be used to transparently transmit China Telecom's CDMA800 and China Unicom / China Mobile's GSM900 signals, leveraging the coverage capabilities of low-frequency band signal sources. This reduces the number of China Telecom's CDMA800 and China Unicom / China Mobile's GSM900 signal source devices, thereby reducing construction investment, ultimately saving construction costs, shortening the construction period, improving construction safety, and easing maintenance difficulties.

[0068] In this embodiment, both the conventional POI and the transparent transmission POI are designed to include an inter-frequency combiner, a bridge, an end combiner, and an output port. The inter-frequency combiner is connected between the 2G / 3G / 4G signal source to be combined and the bridge, and the end combiner is connected between the bridge and the output port. The input end of the end combiner is also connected to a 5G signal source. As shown in Figure 8 , the structural principle diagram of a 5G conventional POI 36 is shown, in which the signals of China Telecom CDMA800 signal source 20, China Mobile GSM1800 signal source 21, China Telecom FDD-LTE (1.8) signal source 22, and China Unicom WCDMA2100 signal source 23 are connected to the fifth inter-frequency combiner 31 of the 5G conventional POI 36. The signals of China Unicom LTE-FDD1.8G signal source or China Unicom GSM1800 signal source 24, China Telecom LTE-FDD2.1G signal source 25, China Mobile TD-LTE (F band) signal source 26, China Mobile TD-LTE (E band) signal source 27, and China Unicom / China Mobile GSM900 signal source 28 are connected to the sixth inter-frequency combiner 32 of the 5G conventional POI 36. Each of the above-mentioned signal sources can be, for example, an RRU (remote radio unit) device. The combined output end of the fifth inter-frequency combiner 31 and the combined output end of the sixth inter-frequency combiner 32 are both connected to the third bridge 33. The first output end of the third bridge 33 and the China Mobile NR2.6G signal source 29 and China Unicom / China Telecom NR3.5G signal source 30 are all connected to the input end of the third end combiner 34, and the output end of the third end combiner 34 is connected to the first signal end ANT1. The second output end of the third bridge 33 and the China Mobile NR2.6G signal source 29 and China Unicom / China Telecom NR3.5G signal source 30 are all connected to the input end of the fourth end combiner 35, and the output end of the fourth end combiner 35 is connected to the second signal end ANT2.

[0069] As shown in FIG9 , the end combiner in the conventional POI includes a fifth input port 48, a sixth input port 49, a seventh input port 50, and a conventional combiner output port 51. The fifth input port 48 is used to input a source signal in the 2515-2675 MHz frequency band, the sixth input port 49 is used to input a source signal in the 3300-3700 MHz frequency band, and the seventh input port 50 is used to input a source signal in the 820-2370 MHz frequency band. The conventional combiner output port 51 is used to output a combined signal of the input signals of the fifth input port 48, the sixth input port 49, and the seventh input port 50. The conventional combiner output port 51 is connected to the first signal terminal ANT1 (or the second signal terminal ANT2) of the conventional POI.

[0070] The 2G / 3G / 4G signal sources in the 5G conventional POI 36 are connected to the fifth and sixth inter-frequency combiners 31 and 32. The first inter-frequency combined signal generated by the fifth and sixth inter-frequency combiners 31 and 32 are input to the third bridge 33 for combination and output to the third and fourth end combiners 34 and 35. The third end combiner 34 combines the combined signal output from the third bridge 33 with the 5G signal input from the China Mobile NR2.6G signal source 29 and the China Unicom / China Telecom NR3.5G signal source 30, and outputs the combined signal to the first signal terminal ANT1. The fourth end combiner 35 combines the combined signal output from the third bridge 33 with the 5G signal input from the China Mobile NR2.6G signal source 29 and the China Unicom / China Telecom NR3.5G signal source 30, and outputs the combined signal to the second signal terminal ANT2.

[0071] As shown in Figure 10, it is a schematic diagram of the structural principle of the 5G transparent transmission POI 37, in which the signals of the China Mobile GSM1800 signal source 21, China Telecom FDD-LTE (1.8) signal source 22, and China Unicom WCDMA2100 signal source 23 are connected to the seventh inter-frequency combiner 38 of the 5G transparent transmission POI 37. The signals of the China Unicom LTE-FDD 1.8G signal source or China Unicom GSM1800 signal source 24, China Telecom LTE-FDD 2.1G signal source 25, China Mobile TD-LTE (F-band) signal source 26, and China Mobile TD-LTE (E-band) signal source 27 are connected to the eighth inter-frequency combiner 39 of the 5G conventional POI 36. Each of the above-mentioned signal sources can be, for example, an RRU (Remote Radio Unit) device. The combined output of the seventh inter-frequency combiner 38 and the combined output of the eighth inter-frequency combiner 39 are both connected to the fourth bridge 40. The first output of the fourth bridge 40, as well as the China Mobile NR2.6G signal source 29 and the China Unicom / China Telecom NR3.5G signal source 30, are all connected to the input of a fifth end combiner 41. The output of the fifth end combiner 41 is connected to the first signal terminal ANT1. The second output of the fourth bridge 40, as well as the China Mobile NR2.6G signal source 29 and the China Unicom / China Telecom NR3.5G signal source 30, are all connected to the input of a sixth end combiner 42. The output of the sixth end combiner 42 is connected to the second signal terminal ANT2. The fifth and sixth end combiners 41 and 42 each have a low-frequency end, and the low-frequency end of the fifth end combiner 41 is connected to the low-frequency end of the sixth end combiner 42. In this embodiment, the end combiners in the transparent transmission POI are provided with an input end for signals with frequencies below 1700 MHz, i.e., a low-frequency end. The input ends of the two end combiners for signals with frequencies below 1700 MHz are connected by a jumper.

[0072] As shown in Figure 11, the end combiner in the transparent transmission POI includes a first input port 43, a second input port 44, a third input port 45, a fourth input port 46, and a transparent transmission combiner output port 47. The first input port 43 is used to input source signals in the 2515-2675MHz frequency band, the second input port 44 is used to input source signals in the 3300-3700MHz frequency band, the third input port 45 is used to input frequency band signals below 1700MHz, and the fourth input port 46 is used to input source signals in the 1710-2370MHz frequency band. The transparent transmission combiner output port 47 is used to output the combined signal of the input signals of the first input port 43, the second input port 44, the third input port 45, and the fourth input port 46. The third input ports 45 of the two end combiners in the transparent output POI are low-frequency terminals, and a jumper is used to connect the third input ports 45 of the two end combiners in the transparent output POI. The transparent transmission combiner output port 47 is connected to the first signal terminal ANT1 (or the second signal terminal ANT2 ) of the transparent output POI.

[0073] The high-frequency signal source in the 5G transparent transmission POI 37 ​​is connected to the seventh inter-frequency combiner 38 and the eighth inter-frequency combiner 39. The third inter-frequency combined signal generated by the seventh inter-frequency combiner 38 and the fourth inter-frequency combined signal generated by the eighth inter-frequency combiner 39 are input to the fourth bridge 40 for combination and output to the fifth and sixth end combiners 41, 42. The fifth end combiner 41 combines the combined signal output from the fourth bridge 40, the low-frequency signal from the first signal terminal ANT1, and the 5G signal input from China Mobile's NR2.6G signal source 29 and China Unicom / China Telecom's NR3.5G signal source 30, and outputs it to the first signal terminal ANT1. The sixth end combiner 42 combines the combined signal output from the fourth bridge 40, the low-frequency signal from the low-frequency end of the fifth end combiner 41, and the 5G signal input from China Mobile's NR2.6G signal source 29 and China Unicom / China Telecom's NR3.5G signal source 30, and outputs it to the second signal terminal ANT2. The low-frequency signal from the first signal terminal ANT1 passes through the output end of the fifth-end combiner 41 to the inside of the fifth-end combiner 41, and is then transmitted to the low-frequency end of the sixth-end combiner 42 through the low-frequency end of the fifth-end combiner 41. It is combined with the high-frequency signal from the high-frequency input end of the fourth bridge 40 and the 5G signal input from the China Mobile NR2.6G signal source 29 and the China Unicom / China Telecom NR3.5G signal source 30 and then output to realize transparent transmission of the low-frequency signal.

[0074] In the conventional POI and transparent transmission POI in the above embodiments of the present application, considering that the attenuation degree of the 5G frequency band (China Mobile NR2.6, China Telecom China Unicom NR3.5) during the propagation process of leaky cables is much greater than that of signals in other frequency bands, and the existing POI high and low frequency signal same-level combining method cannot solve the impact of different loss differences of high and low frequency signals in the propagation process on the coverage quality. In the embodiments of the present application, low insertion loss access of the 5G frequency band can be achieved by adding end combiners, for example, the third end combiner 34, the fourth end combiner 35, the fifth end combiner 41, and the sixth end combiner 42 shown in Figures 8-9. The insertion loss of the 5G frequency band can be reduced from 5.5dB to about 1dB, which can reduce the combined insertion loss of the 5G frequency band signal to meet the combined insertion loss requirements of the network system and improve the coverage capability of the 5G frequency band signal after combining.

[0075] In an embodiment of the present application, a cross-polarization leaky cable communication coverage system is provided, in which a transparent transmission POI can transparently transmit 2G standard signals with a lower operating frequency, reduce the number of low-frequency band signal sources, thereby reducing construction investment, achieving the purpose of saving construction costs, shortening the construction period, improving construction safety and reducing maintenance difficulty. In addition, a cross-polarization leaky cable group is set up to connect the signals between the adjacent conventional POI and the transparent transmission POI. On the one hand, it saves the installation space of the leaky cable and provides space for arranging more leaky cables. On the other hand, the cross-polarization leaky cable reduces the coherence of the signal, forming a channel condition that is conducive to multi-stream signal transmission, increasing the number of user access, and improving the quality of communication.

[0076] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A cross-polarization leaky cable communication coverage system, characterized in that: It includes a conventional POI and a transparent transmission POI arranged at intervals, and a cross-polarization leaky cable group whose signals are connected between the adjacent conventional POIs and the transparent transmission POIs, wherein the cross-polarization leaky cable group includes at least two leaky cables arranged side by side, and the radiation polarization directions of the two adjacent leaky cables are different; The transparent transmission POI does not inject signals with a frequency below 1700 MHz, and the transparent transmission POI can directly output signals with a frequency below 1700 MHz received from a cross-polarization leaky cable group at an upper level to a cross-polarization leaky cable group at a lower level.

2. A cross-polarization leaky cable communication coverage system according to claim 1, characterized in that: The radiation polarization directions of the leaky cables in the cross-polarization leaky cable group are arranged alternately in a horizontal polarization and a vertical polarization manner.

3. According to the cross-polarization leaky cable communication coverage system described in claim 1, it is characterized in that: The radiation polarization direction of each leaky cable in the cross-polarization leaky cable group is vertical polarization, horizontal polarization, +45° polarization or -45° polarization.

4. A cross-polarization leaky cable communication coverage system according to claim 1, characterized in that: The periodic arrangement of the slots of the leaky cables in the cross-polarization leaky cable group is not completely the same.

5. A cross-polarization leaky cable communication coverage system according to claim 1, characterized in that: At least two slot groups with different polarizations are provided on the same leaky cable in the cross-polarization leaky cable group, and the slot groups with different polarizations are arranged at intervals; the polarization modes of the slot groups at the same longitudinal corresponding positions of any two adjacent leaky cables in the cross-polarization leaky cable group are different; the transmission loss difference of two adjacent slot groups with different polarizations on the same leaky cable is not greater than 3dB / 100m, the coupling loss difference is not greater than 5dB, and the radiation system loss is not greater than 7dB.

6. A cross-polarization leaky cable communication coverage system according to claim 1, characterized in that: The conventional POI comprises a first hetero-frequency combiner, a second hetero-frequency combiner, a first bridge, a first output port and a second output port, wherein input ends of the first hetero-frequency combiner and the second hetero-frequency combiner are connected to a signal source to be combined, output ends of the first hetero-frequency combiner and the second hetero-frequency combiner are connected to a first bridge, and the first bridge is connected to the first output port and the second output port; The transparent transmission POI includes a third different frequency combiner, a fourth different frequency combiner, a second bridge, a first end combiner, a second end combiner, a third output port and a fourth output port, the input ends of the third different frequency combiner and the fourth different frequency combiner are connected to a signal source with a frequency greater than 1700 MHz, and the output ends of the third different frequency combiner and the fourth different frequency combiner are connected to the second bridge; the first output end of the second bridge is connected to the first end combiner, and the second output end of the second bridge is connected to the second end combiner, the first end combiner and the second end combiner both include a low frequency end, and the low frequency end of the first end combiner is connected to the low frequency end of the second end combiner; The output end of the first end combiner is connected to the third output port, and the output end of the second end combiner is connected to the fourth output port.

7. A cross-polarization leaky cable communication coverage system according to claim 1, characterized in that: The conventional POI and the transparent transmission POI both include an heterodyne frequency combiner, a bridge, an end combiner and an output port. The heterodyne frequency combiner is connected between the signal source of the 2G / 3G / 4G standard to be combined and the bridge, the end combiner is connected between the bridge and the output port, and the signal source of the 5G standard is directly connected to the input end of the end combiner.

8. A cross-polarization leaky cable communication coverage system according to claim 6, characterized in that: An input terminal for signals with a frequency below 1700 MHz is provided on the terminal combiner in the transparent transmission POI, and the input terminals for signals with a frequency below 1700 MHz of the two terminal combiners are connected by a jumper.

9. A cross-polarization leaky cable communication coverage system according to claim 7, characterized in that: The end combiner in the transparent transmission POI includes a first input port, a second input port, a third input port, a fourth input port and a transparent transmission combining output port, wherein the first input port is used to input a source signal in the frequency band of 2515-2675MHz, the second input port is used to input a source signal in the frequency band of 3300-3700MHz, the third input port is used to input a frequency band signal below 1700MHz, the fourth input port is used to input a source signal in the frequency band of 1710-2370MHz, and the transparent transmission combining output port is used to output a combined signal of the input signals of the first input port, the second input port, the third input port and the fourth input port.

10. A cross-polarization leaky cable communication coverage system according to claim 7, characterized in that: The end combiner in the conventional POI includes a fifth input port, a sixth input port, a seventh input port and a conventional combining output port, the fifth input port is used to input a source signal in the 2515-2675MHz frequency band, the sixth input port is used to input a source signal in the 3300-3700MHz frequency band, the seventh input port is used to input a source signal in the 820-2370MHz frequency band, and the conventional combining output port is used to output a combined signal of the input signals of the fifth input port, the sixth input port and the seventh input port.

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