Method for detecting base station antenna radio frequency channel connection relation and channel calibration

Abstract

The method for detecting the radio frequency channel connection relation and channel calibration of the base station antenna comprises the steps that a sample from a calibration network is received, the sample is a coupling signal of a radio frequency channel in the base station antenna and a signal obtained after a phase identifier is added to the calibration network, the phase identifier is a phase value, and the phase value is a phase value; the antenna port marking module is used for marking an antenna port connected with a remote radio unit (RRU) port in a radio frequency channel; and obtaining the antenna port actually connected with the RRU port according to the phase identifier. According to the technical scheme provided by the embodiment of the invention, no device needs to be added, no product size needs to be increased, and the problem of high-cost detection of the connection relationship between the RRU port and the antenna port in the radio frequency channel is effectively solved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a method for detecting a base station antenna radio frequency channel connection relationship and channel calibration. Background Art

[0002] In wireless communication technology, base stations provide wireless signal transmission services for wireless terminals and wired communication networks. Figure 1 As shown, the base station includes a baseband unit (BBU), a radio remote unit (RRU) and an antenna. The BBU is mainly used for channel encoding and decoding, modulation and demodulation of baseband signals, protocol processing, etc., and is usually installed in a ground machine room. The RRU and antenna are usually fixed on a pole or tower more than ten meters or even dozens of meters above the ground. The BBU and RRU are connected by optical fiber. The RRU converts the optical signal transmitted by the optical fiber into a radio frequency signal and amplifies it. The RRU and the antenna are connected by a feeder line, which sends the radio frequency signal to the antenna for radiation, or converts the radio frequency signal received by the antenna into the signal required by the BBU and sends it to the BBU via optical fiber.

[0003] With the development of wireless communication technology, the demand for data services continues to rise, and the number of base stations is increasing. At the same time, the bandwidth of each base station continues to increase, and the number of RF channels for sending and receiving signals is also increasing. For example, 8-receive 8-transmit (8T8R) has become the current development trend. As shown in Figure 2(a), the RRU and the antenna each have 8 ports, which are connected by a feeder line. That is, the two ends of the 8 feeders need to be connected to 16 ports one by one. In this case of multiple ports, it is very likely that the feeder connection error will occur as shown in Figure 2(b).

[0004] In order to detect the situation of feeder connection error, one solution adopted by the prior art is to integrate the standing wave increase point and the standing wave detection point in the phase shifter (the component in the antenna used to adjust the antenna beam downtilt angle), and determine whether the line sequence (connection) of the input port is correct through the standing wave alarm and the signal of the antenna port. However, the disadvantages of this method are high cost and large size. Another solution adopted by the prior art is to add a bias device and a demodulation circuit to the RRU and the antenna, add a single-pole multi-throw switch to the antenna, obtain the port information and switch information of the antenna line equipment, and thereby determine the port connection relationship between the RRU and the antenna. However, the disadvantage of this method is that the cost is still very high. Summary of the invention

[0005] In view of this, the present application provides a method, device and equipment for detecting the connection relationship of base station antenna RF channels and channel calibration, so as to solve the problem of high cost detection of the connection relationship between RRU ports and antenna ports in the RF channel.

[0006] In the first aspect, an embodiment of the present application provides a method for detecting the connection relationship and channel calibration of the RF channel of a base station antenna, which is applied to a BBU. The method includes: receiving a sample from a calibration network, the sample being a coupled signal of the RF channel in the base station antenna, and a signal obtained after a phase identifier is added by the calibration network. The phase identifier is a phase value, which is used to mark the antenna port in the RF channel connected to the RF remote RU port; according to the phase identifier, the antenna port actually connected to the RRU port is known.

[0007] In a possible implementation, after receiving the sample from the calibration network, the method further includes: obtaining a first phase value, which is the phase value of the sample; obtaining a phase identifier according to a second phase value and the first phase value; and the second phase value is the phase value of the coupled signal.

[0008] In a possible implementation, obtaining the phase identifier according to the second phase value and the first phase value includes: subtracting the second phase value from the first phase value to obtain the phase identifier.

[0009] In a possible implementation, the antenna port actually connected to the RRU port is obtained according to the phase identifier, including: obtaining the serial number of the antenna port actually connected to the RRU port by the formula φ÷Δφ+1, wherein φ is the phase identifier and Δφ is the phase difference between adjacent antenna ports.

[0010] In a possible implementation manner, after the antenna port actually connected to the RRU port is acquired according to the phase identifier, the method further includes: mapping the RRU port to the antenna port actually connected to the RRU port.

[0011] In a possible implementation, after the antenna port actually connected to the RRU port is acquired according to the phase identifier, the method further includes: setting the amplitude and phase of the radio frequency channel according to the phase identifier and the phase value of the sample.

[0012] In a possible implementation, the above-mentioned setting of the amplitude and phase of the RF channel according to the phase identifier and the phase value of the coupled signal includes: removing the phase identifier from the phase value of the sample to obtain the phase value of the coupled signal; and setting the amplitude and phase of the RF channel according to the phase value of the coupled signal.

[0013] In the second aspect, an embodiment of the present application provides a method for detecting the connection relationship and channel calibration of base station antenna RF channels, which is applied to a calibration network. The method includes: performing phase shift processing on the coupled signals from n-1 RF channels in n RF channels respectively to obtain n-1 signals containing phase identifiers, where n≥2; the phase identifier is used to uniquely mark the antenna port connected to the RRU port in the RF channel to which each signal belongs.

[0014] In a possible implementation manner, the phase identifier is a discrete value.

[0015] In a possible implementation manner, the phase identifier is an arithmetic difference value or a multiple distribution value.

[0016] In a possible implementation manner, the phase identifier is less than or equal to 360°.

[0017] In a third aspect, an embodiment of the present application provides a calibration network applied to a base station antenna, the calibration network comprising: a splitter / combiner and n-1 phase shift branches. The n-1 phase-shifting branches respectively perform phase-shifting processing on the coupled signals of n-1 radio frequency channels among the n radio frequency channels to obtain n-1 signals containing phase identifiers, wherein n≥2; the phase identifier is used to uniquely mark the antenna port connected to the RRU port in the radio frequency channel to which the respective signal belongs (i.e., the antenna port actually connected to the RRU port); the splitter / combiner includes a combining end and n input ends, the n input ends are used to receive the coupled signals of the n radio frequency channels correspondingly, the n-1 input ends among the n input ends are used to receive the coupled signals of the n-1 radio frequency channels correspondingly, the n-1 phase-shifting branches are correspondingly connected to the n-1 input ends, the reference branches of the n-1 phase-shifting branches are connected to the reference input end, and the reference input end is an input end among the n input ends except the n-1 input end; the combining end is used to combine the n-1 signals containing the phase identifier and the coupled signal received by the reference input end into one path and output it.

[0018] In a possible implementation, the phase-frequency curve slopes of the n-1 phase-shift branches and the reference branch are the same, and the lengths are related to the phase identifiers.

[0019] In a possible implementation, the n RF channels include a first RF channel, a second RF channel, a third RF channel and a fourth RF channel, the first RF channel being an RF channel other than the n-1 RF channels among the n RF channels; the splitter / combiner includes a first-stage splitter / combiner and a second-stage splitter / combiner; the n-1 phase-shifting branches include a first phase-shifting branch (phase-shifting branch 81), a second phase-shifting branch (phase-shifting branch 81) and a third phase-shifting branch (phase-shifting branch 82); the first-stage splitter / combiner includes a first splitter / combiner (power divider 71) and a second splitter / combiner (power divider 72); the second-stage splitter / combiner includes a third splitter / combiner Combiner (power divider 73); the first input end of the first splitter / combiner is connected to the reference branch, which is used to receive the coupling signal of the first RF channel, and the second input end is connected to the first phase-shifting branch, which is used to receive the coupling signal of the second RF channel and change the phase of the coupling signal of the second RF channel; the first input end of the second splitter / combiner is used to receive the coupling signal of the third RF channel, and the second input end is connected to the second phase-shifting branch, which is used to receive the coupling signal of the fourth RF channel and change the phase of the coupling signal of the fourth RF channel; the first input end of the third splitter / combiner is connected to the combining end of the first splitter / combiner, and the second input end is connected to the combining end of the second splitter / combiner through the third phase-shifting branch.

[0020] In a possible implementation, the n RF channels also include a fifth RF channel, a sixth RF channel, a seventh RF channel and an eighth RF channel, the first-level splitter / combiner also includes a fourth splitter / combiner (power divider 74) and a fifth splitter / combiner (power divider 75), the second-level splitter / combiner also includes a sixth splitter / combiner (power divider 76); the splitter / combiner also includes a third-level splitter / combiner; the third-level splitter / combiner also includes a seventh splitter / combiner (power divider 77); the phase-shift branch also includes a fourth phase-shift branch (phase-shift branch 83, 8013), a fifth phase-shift branch (phase-shift branch 82, 8012), a sixth phase-shift branch (phase-shift branch 81, 8011) and a seventh phase-shift branch (phase-shift branch 81, 8011); the The combining end of the three splitters / combiners is connected to the first input end of the seventh splitter / combiner, and the second input end of the seventh splitter / combiner is connected to the combining end of the sixth splitter / combiner through a fourth phase-shifting branch; the first input end of the sixth splitter / combiner is connected to the combining end of the fourth splitter / combiner, and the second input end is connected to the combining end of the fifth splitter / combiner through a fifth phase-shifting branch; the first input end of the fourth splitter / combiner is used to receive the coupled signal of the fifth radio frequency channel, and the second input end is connected to the sixth phase-shifting branch, so as to receive and change the phase of the coupled signal of the sixth radio frequency channel; the first input end of the fifth splitter / combiner is used to receive the coupled signal of the seventh radio frequency channel, and the second input end is connected to the seventh phase-shifting branch, so as to receive and change the phase of the coupled signal of the eighth radio frequency channel.

[0021] In a possible implementation, the splitter / combiner is a T-shaped power splitter or a Wilkinson power splitter.

[0022] In a possible implementation manner, the phase identifier is a discrete value.

[0023] In a possible implementation manner, the phase identifier is an arithmetic difference value or a multiple distribution value.

[0024] In a possible implementation manner, the phase identifier is less than or equal to 360°.

[0025] In a possible implementation, the n-1 phase-shifting branches each include: a first transmission line, a first short-circuit line, and a second short-circuit line, the first transmission line is connected to a corresponding input terminal among the n-1 input terminals, the lengths of the first short-circuit line and the second short-circuit line are both one-quarter of the wavelength of the coupling signal, one end of the first short-circuit line and the second short-circuit line is grounded, and the other end is connected to the first transmission line, and the distance between the first short-circuit line and the second short-circuit line is one-quarter of the wavelength of the coupling signal, or the other ends of the first short-circuit line and the second short-circuit line are open-circuited, and the middle point is connected to the first transmission line, and the distance between the first short-circuit line and the second short-circuit line is one-half of the wavelength of the coupling signal; the reference branch is the second transmission line, which is connected to the reference input terminal; the length difference between the first transmission line and the second transmission line is related to the phase identifier.

[0026] In a fourth aspect, an embodiment of the present application provides a base station antenna, comprising: an array antenna and a calibration network as described in any one of the third aspects above, the array antenna comprising n antenna ports, which are coupled and connected to the n input ports of the calibration network accordingly.

[0027] In the fifth aspect, an embodiment of the present application provides a device for detecting the connection relationship and channel calibration of the radio frequency channel of the base station antenna, which is applied to the BBU, and the device includes: a receiving module and an identification module. The receiving module is used to receive samples from the calibration network, the samples are the coupled signals of the radio frequency channel in the base station antenna, and the signals are obtained after the calibration network adds a phase identifier, the phase identifier is a phase value, and is used to mark the antenna port connected to the RRU port in the radio frequency channel; the identification module is used to obtain the antenna port actually connected to the RRU port according to the phase identifier.

[0028] In a possible implementation, the above-mentioned device also includes: a first acquisition module and a second acquisition module, the first acquisition module is used to obtain a first phase value after the receiving module receives a sample from the calibration network, the first phase value is the phase value of the sample; the second acquisition module is used to obtain a phase identifier based on the second phase value and the first phase value; the second phase value is the phase value of the coupled signal.

[0029] In a possible implementation manner, the second acquisition module is further used to: subtract the second phase value from the first phase value to obtain a phase identifier.

[0030] In a possible implementation, the identification module is further used to obtain the serial number of the antenna port actually connected to the RRU port by using the formula φ÷Δφ+1, where φ is a phase identifier and Δφ is a phase difference between adjacent antenna ports.

[0031] In a possible implementation, the apparatus further includes: an adjustment module, configured to map the RRU port to the antenna port actually connected to the RRU port after the identification module learns the antenna port actually connected to the RRU port according to the phase identifier.

[0032] In a possible implementation, the device further includes: an amplitude and phase setting module, which is used to set the amplitude and phase of the RF channel according to the phase identifier and the phase value of the sample after the identification module obtains the antenna port actually connected to the RRU port according to the phase identifier.

[0033] In a possible implementation, the amplitude and phase setting module is further used to: remove the phase identifier from the phase value of the sample to obtain the phase value of the coupled signal; and set the amplitude and phase of the RF channel according to the phase value of the coupled signal.

[0034] When the first aspect is implemented by software, its functions can be divided into different modules according to actual needs. In the device provided by the fifth aspect, the division of modules corresponds to the method provided by the first aspect, which is only an example and not a limitation.

[0035] In a sixth aspect, an embodiment of the present application provides a BBU, comprising the device for detecting the connection relationship of the radio frequency channels of base station antennas and channel calibration as described in any one of the fifth aspects above.

[0036] In the seventh aspect, an embodiment of the present application provides an electronic device, comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein when the computer program instructions are executed by the processor, the electronic device is triggered to execute any one of the methods described in the first aspect above.

[0037] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute any method described in the first aspect.

[0038] In a ninth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product comprises executable instructions, and when the executable instructions are executed on a computer, the computer executes any one of the methods described in the first aspect.

[0039] The embodiment of the present application adds a phase mark for marking the antenna port in the calibration network, so that the BBU can know the antenna port actually connected to the RRU port in each RF channel, without adding devices or increasing the product size, effectively solving the problem of high-cost detection of the connection relationship between the RRU port and the antenna port in the RF channel. Furthermore, the BBU sets the amplitude and phase of each RF channel based on the phase mark, so as to realize channel calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 is a schematic diagram of the structure of a base station;

[0042] FIG2(a) is a schematic diagram of a RF channel feeder connection in an 8-receive 8-transmit base station antenna;

[0043] FIG2( b ) is a schematic diagram of another type of RF channel feeder connection in an 8-receive 8-transmit base station antenna;

[0044] Figure 3 A schematic diagram of a network architecture for wireless communications provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of a base station provided in an embodiment of the present application;

[0046] Figure 5 A logical schematic diagram of a calibration network provided in an embodiment of the present application;

[0047] Figure 6 A logical schematic diagram of another calibration network provided in an embodiment of the present application;

[0048] FIG. 7( a ) is a schematic diagram of a calibration network according to an embodiment of the present application;

[0049] FIG. 7( b ) is a schematic diagram of the structure of another calibration network provided in an embodiment of the present application;

[0050] FIG8( a ) is a schematic diagram of the structure of a phase shift branch provided in an embodiment of the present application;

[0051] FIG8( b ) is a schematic structural diagram of another phase shifting branch provided in an embodiment of the present application;

[0052] Fig. 9 A schematic diagram of the structure of another calibration network provided in an embodiment of the present application;

[0053] FIG10( a ) is a schematic diagram of a connection of a feeder in a radio frequency channel provided in an embodiment of the present application;

[0054] FIG10( b ) is a schematic diagram of another connection of a feeder in a radio frequency channel provided in an embodiment of the present application;

[0055] Fig.11 A schematic diagram of the relationship between antenna ports connected to RRU ports and phase identifiers in an eight-RF channel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0057] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0058] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0059] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0060] Wireless communication network architecture Figure 3 As shown, the Global System for Mobile Communications (GSM) / Universal Mobile Telecommunications System (UMTS) and the Evolved E-UTRAN (Evolved E-UTRAN) in the Long Term Evolution (LTE) / System Architecture Evolution (SAE) are both provided with base stations, and the technical solution provided in the embodiment of the present application can be applied to Figure 3Any base station in the wireless communication network architecture shown, such as a base station subsystem (BSS) base station in GSM / UMTS, a UMTS terrestrial radio access network (UTRAN) base station, or an evolved UTRAN (Evolved E-UTRAN) base station in LTE / SAE, etc.

[0061] The antenna part of the base station is used to connect the mobile user terminal and the wireless network RF front end. In order to calibrate the amplitude and phase between different RF channels, a calibration network is often used in the base station antenna to send part of the energy coupled by the coupler to the RF signal at the antenna port to the BBU, so that the BBU can adjust the amplitude and phase of the RF signal in each RF channel according to the amplitude and phase consistency of the signal in this part of energy to achieve channel calibration. Figure 4 The antenna part 10 shown includes an array antenna 11, a coupler 12 and a calibration network 13 (excluding the half-wave dipole in the array antenna 11). The array antenna 11 is composed of a number of half-wave dipoles arranged in a certain pattern, and can be an active array antenna or a passive array antenna. The coupler 12 is located between the antenna port connected to the RRU 20 and the corresponding half-wave dipole, and samples the RF signal received by the corresponding antenna port. The sampled sample is transmitted to the RRU 20 through the calibration network 13, converted into a signal that can be processed by the BBU 30 through the RF module, and then transmitted back to the BBU 30. The BBU 30 determines the relative amplitude and / or phase change of the corresponding RF channel based on the sample, and adjusts the amplitude and phase applied to the RF channel accordingly to achieve channel calibration. The method for detecting the connection relationship of the radio frequency channel of the base station antenna provided in the embodiment of the present application adds a phase mark to the sample through the calibration network to mark the corresponding antenna port. The BBU determines which antenna port the RRU port in the radio frequency channel is actually connected to based on the phase mark, thereby knowing the actual connection relationship between the RRU port and the antenna port in the radio frequency channel. There is no need to integrate the standing wave amplification point and the standing wave detection point in the phase shifter, and there is no need to add a bias device, a demodulation circuit and a single-pole double-throw switch, which can effectively reduce costs. Moreover, compared with the existing calibration network that is only used for channel calibration, the calibration network provided in the embodiment of the present application can not only be used for channel calibration, but can also be further used to detect the actual connection relationship between the RRU port and the antenna port in the radio frequency channel.

[0062] The calibration network includes the input terminal, the splitter / combiner (as shown in Figure 7(a), Figure 7(b) and Fig. 9As shown) and output ends, the input end corresponds to the antenna port one by one, and the samples sampled by the receiving coupler are combined by the splitter / combiner into one path for the samples received by multiple input ends and output by the output end. Therefore, the purpose of adding a phase mark can be achieved by performing phase shifting processing on the samples at the corresponding input end.

[0063] Assuming that the RRU has n RF channels, there are n corresponding antenna ports, and there are n input terminals of the calibration network, the phase shift circuit can be connected to each of the n input terminals to make the phase of the RF signal samples in the n RF channels move differently. The phase difference with the original phase of the sample is the phase mark. For example, the phase difference of the sample of the first RF channel after the phase shift circuit is Δφ1, the phase difference of the sample of the second RF channel after the phase shift circuit is Δφ2, ..., the phase difference of the sample of the nth RF channel after the phase shift circuit is Δφ n , Δφ1, Δφ2, … Δφ n are not equal, and are phase markers added to the n-channel RF channel samples, used to mark the n antenna ports. Δφ1, Δφ2, …Δφ n It can be a discrete value, such as an arithmetic distribution or an arbitrary multiple distribution. It should be noted that in practical applications, Δφ1, Δφ2, ... Δφ n Considering the uniqueness and feasibility of phase identification, a preferred method is Δφ1, Δφ2, ... Δφ n ≤360°, and Δφ1, Δφ2,…Δφ n Greater than the system error. The values ​​of the following phase identifiers are similar and will not be repeated.

[0064] In the calibration network, a method of adding a phase mark to the sample can also be to connect one of the input terminals to the reference branch and connect the phase shift branch to the other input terminals, so that the samples between the input terminals have a phase difference, which serves as the phase mark for marking the antenna port. Figure 5 As shown, in the calibration network 50, the mth input terminal is connected to the reference branch, and the remaining input terminals are correspondingly connected to the phase shift branches, so that the samples of the 1st, 2nd, 3rd, ..., m-1, m+1, ... and nth input terminals produce different phase differences with respect to the sample of the mth input terminal: Δφ1, Δφ2, Δφ3, ... Δφ n-1 , as the phase identifier of the antenna port corresponding to the n input ports except the m-th port, the phase identifier of the antenna port corresponding to the m-th input port is 0.

[0065] A preferred method is Figure 6As shown, the first input terminal of the calibration network 60 is a reference branch, and the remaining input terminals are connected to the phase shift branch. The phase differences between the second, third, ...n input terminals and the reference branch are Δφ, 2Δφ, ...(n-1)Δφ, respectively, so that when the n input terminals receive samples, the phase identifiers of the corresponding antenna ports are added respectively: 0, Δφ, 2Δφ, ...(n-1)Δφ.

[0066] In the embodiment of the present application, the phase identifier is preferably a non-frequency-variable phase shift such as 0, Δφ, 2Δφ, ... (n-1)Δφ. The reason is that the inconsistency of the RF cable length, coupler, connector, etc. between the RRU and the antenna leads to a large difference in the electrical length between different RF channels (which may exceed one wavelength). If the phase identifier is a frequency-variable phase shift, that is, different path differences are introduced between different RF channels in the calibration network, it is difficult to effectively mark each RF channel, and thus it is difficult to identify whether the feeder connection between the RRU and the antenna is wrong. Therefore, the calibration network embodiment of the present application uses a non-frequency-variable phase shift as a phase identifier to mark the antenna port in the RF channel, and identifies which antenna port the signal of each RF channel comes from through the phase identifier, thereby avoiding the influence of the inconsistency of the RF cable length, coupler, connector, etc., and is conducive to the detection of the connection relationship of the base station antenna RF channel and channel calibration.

[0067] In the calibration network provided in the embodiment of the present application, the splitter may be one-to-two, one-to-four, one-to-six, one-to-eight, etc., or the combiner may be two-in-one, four-in-one, six-in-one, eight-in-one, etc. Figure 5 or Figure 6 The calibration network shown may include a one-to-n splitter or an n-to-one combiner with n input terminals.

[0068] A calibration network embodiment provided in the present application is applied to an 8-channel antenna. As shown in FIG7(a), the calibration network 70 includes 7 T-shaped power dividers: power dividers 71 to 77. The 7 T-shaped power dividers are divided into three levels. The first-level power divider includes power dividers 71, 72, 74 and 75 (corresponding to the first power divider, the second power divider, the fourth power divider and the fifth power divider), the second-level power divider includes power dividers 73 and 76 (the third power divider and the sixth power divider), and the third-level power divider is power divider 77 (the seventh power divider). The combining end of the first-level power divider is connected to the branch end of the second-level power divider, and the combining end of the second-level power divider is connected to the branch end of the third-level power divider. The second input ends of the power dividers 71, 72, 74 and 75 are all connected to the phase shift branch 81, and the phase difference relative to the reference branch connected to the first input end of each is Δφ (Δφ≤45°). The second input terminals of power dividers 73 and 76 are connected to phase shift branch 82, and the phase difference with respect to the reference branch connected to the first input terminals is 2Δφ. The second input terminal of power divider 77 is connected to phase shift branch 83, and the phase difference with respect to the reference branch connected to the first input terminal is 4Δφ.

[0069] The eight samples from the eight antenna ports are combined into four paths by the first-stage power divider. Among them, the samples sampled from the second, fourth, sixth and eighth antenna ports are phase-shifted by Δφ after passing through the first-stage power divider.

[0070] The samples are combined into two paths by the second-stage power divider. The samples sampled from the 3rd, 4th, 7th and 8th antenna ports have their phases shifted by 2Δφ after passing through the second-stage power divider. The phases of the samples sampled from the 4th and 8th antenna ports have shifted by a total of 3Δφ.

[0071] After the third-stage power splitter, the signals are combined into one path. The samples sampled from the 5th, 6th, 7th and 8th antenna ports have their phases shifted by 4Δφ after the third-stage power splitter. The phases of the samples sampled from the 6th, 7th and 8th antenna ports have shifted by 5Δφ, 6Δφ and 7Δφ respectively. The number and level of splitters / combiners here can be determined by the number of RF channels and the number of branches of the splitters / combiners used in actual applications, and there is no restriction here. For example, as a variation of this embodiment, when there are four RF channels and the splitter / combiner is one-to-two or two-in-one, there are three splitters / combiners, which can be divided into two levels of splitters / combiners (first-level splitters / combiners and second-level splitters / combiners), wherein the first-level splitter / combiner includes two splitters / combiners (first splitter / combiner and second splitter / combiner), and the second-level splitter / combiner includes one splitter / combiner (third splitter / combiner). When there are four RF channels and the splitter / combiner is one-to-four or four-in-one, the calibration network only needs one splitter / combiner, and the connected phase shift branch can be designed similarly according to the phase shift principle in the context.

[0072] The calibration network shown in FIG. 7( b ) is a variation of this embodiment, in which the T-shaped power divider is replaced by a Wilkinson power divider, and the principle is the same as that of FIG. 7( a ).

[0073] The calibration network provided in the embodiment of the present application uses a T-shaped power divider or a Wilkinson power divider to form a multi-input and one-output calibration network, which can achieve the purpose of miniaturized layout.

[0074] Finally, the phase of the samples sampled from the first antenna port output by the third-stage power divider has not moved, and can be regarded as the added phase mark of 0. The phases of the samples sampled from the second to the eighth antenna ports have moved by Δφ, 2Δφ, 3Δφ, 4Δφ, 5Δφ, 6Δφ, and 7Δφ, respectively, and can be regarded as the added phase marks: Δφ, 2Δφ, 3Δφ, 4Δφ, 5Δφ, 6Δφ, and 7Δφ, respectively. It can be understood that these samples themselves contain information about the RRU port, such as the RRU port serial number or information uniquely corresponding to the RRU port. After the calibration network, the phase mark marking the antenna port is added. In this way, the subsequent BBU can obtain the actual connection relationship between the RRU and the antenna in each RF channel through the samples of each RF channel.

[0075] In the above embodiment, the phase shift branch may be a phase shift branch 801 as shown in FIG8( a ), comprising: a line segment 12 (a first transmission line) and two grounded short-circuit lines 802. The distance between the two short-circuit lines 802 and the length of the short-circuit lines 802 are both one-quarter of the wavelength of the sample RF signal.

[0076] Wherein, line segment 12 represents the transmission line that needs to be phase-shifted in the above embodiment. Figure 5 The transmission lines between the input terminals other than the mth input terminal and the coupler are shown as Figure 6 The transmission line between the input end other than the first transmission line shown and the coupler, or the transmission line between the second input end of the first-stage splitter / combiner and the coupler as shown in Figures 7(a) and (b), the transmission line between the combining end of the previous stage (first stage or second stage) splitter / combiner and the second input end of the next stage (second stage or third stage) splitter / combiner, and so on.

[0077] Line segment 34 represents the transmission line used as a reference branch in the above embodiment. Figure 5 The transmission line between the mth input terminal and the coupler is shown as Figure 6 The transmission line between the first transmission line shown and the coupler, or the transmission line between the first input end of the first-stage splitter / combiner and the coupler as shown in Figures 7(a) and (b), the transmission line between the combining end of the previous stage (first stage or second stage) splitter / combiner and the first input end of the next stage (second stage or third stage) splitter / combiner, and so on.

[0078] When the short-circuit line 802 is at low frequency, it is equivalent to inductive loading, and the phase of the phase-shifting branch 801 is ahead of when there is no inductive loading; when the short-circuit line 802 is at high frequency, it is equivalent to capacitive loading, and the phase of the phase-shifting branch 801 is delayed relative to when there is no capacitive loading. Therefore, loading a quarter-wavelength short-circuit line 802 can change the slope of the phase-frequency curve of the phase-shifting branch 801. When the above-mentioned phase is identified as a non-frequency-variable phase shift, the line diameter (width) of the short-circuit line 802 can be adjusted to make the slope of the phase-frequency curve of the phase-frequency curve of the phase-shifting branch 801 equal to the slope of the phase-frequency curve of the reference branch, so that the phase difference between the reference branch and the phase-shifting branch 801 is a constant value and does not change with frequency. The phase difference Δφ, 2Δφ, ...nΔφ, etc. of the phase-shifting branch 801 relative to the reference branch can be achieved by adjusting the length of the line segment 12 and / or the line segment 34. For example, when the line segment 35 is used as a reference branch of multiple phase-shifting branches, the lengths of the line segments 12 in each phase-shifting branch may be different to meet the phase shift requirements of each phase-shifting branch. Figure 6 In the calibration network shown, the slopes of the phase-frequency curves of the reference branch and the phase-shift branch are equal, and the transmission line between the first input terminal and the coupler is used as the reference branch, and its length is different from the lengths of the transmission lines between the second to n input terminals and the coupler. For example, the length of the transmission line between the second input terminal and the coupler differs from the length of the reference branch by ΔL, the length of the transmission line between the third input terminal and the coupler differs from the length of the reference branch by 2ΔL, and so on. The length of the transmission line between the nth input terminal and the coupler differs from the length of the reference branch by (n-1)ΔL, so that the phases of the phase-shift branches connected to the second, third, ...n input terminals differ from the reference branch by Δφ, 2Δφ, ...(n-1)Δφ, respectively.

[0079] Another calibration network implementation provided by the present application is as follows. Fig. 9 As shown, the difference from the embodiment shown in FIG. 7 (b) is that the phase-shift branch connected to the second input end of the first-stage Wilkinson power divider is 8011, the phase-shift branch connected to the second input end of the second-stage Wilkinson power divider is 8012, and the phase-shift branch connected to the second input end of the third-stage Wilkinson power divider is 8013. When the slopes of the phase-frequency curves of the reference branches of each phase-shift branch are different, correspondingly, the slopes of the phase-frequency curves of each phase-shift branch may also be different. Preferably, the slopes of the phase-frequency curves of each phase-shift branch (8011, 8012 and 8013) and its reference branch are equal. When the lengths of the reference branches are equal, the transmission line length of the phase-shift branch 8012 is half of the transmission line length of the phase-shift branch 8011, and the transmission line length of the phase-shift branch 8013 is half of the transmission line length of the phase-shift branch 8012.

[0080] In some other calibration network embodiments, the number of short-circuit lines in the phase-shift branch (such as the short-circuit line 802 in the embodiment shown in FIG. 8( a )) is greater than 2. In the scenario in which this embodiment is applied, the frequency band of the RF signal is wider.

[0081] In the above embodiment, the phase-shift branch may also be a phase-shift branch 803 as shown in FIG8(b), which differs from the phase-shift branch 801 as shown in FIG8(a) in that the distance between the two short-circuit lines 802 is half of the wavelength of the radio frequency signal, and the impedance of the connection line between the two is greater than the impedance of the line segment 12. In addition, the middle point of the two short-circuit lines 802 is connected to the line segment 12, and one end of the two short-circuit lines 804 is open and the other end is grounded.

[0082] In the base station of the calibration network application provided in the above embodiment, during the detection and debugging stage, the BBU first obtains the slope of the phase-frequency curve of each RF channel. For example, the BBU sends detection signals of different frequencies multiple times, obtains multiple phases corresponding to each RF channel through the calibration network, and then obtains the slope of the phase-frequency curve of each RF channel based on these frequencies and phases. When the above phase identifier is a non-frequency-variable phase shift, the phase identifier added by the calibration network does not affect the slope of the phase-frequency curve of each RF channel.

[0083] Then, the BBU obtains the phase identifier used to mark the antenna port in each RF channel. For example, in the detection and debugging stage or the formal operation stage, after the BBU sends a signal of a certain frequency to a certain RF channel, it receives a sample of the signal sent by the calibration network through the RRU and obtains the phase (actual phase) of the sample. The BBU subtracts the theoretical phase (calculated by the frequency value of the signal and the slope of the phase-frequency curve in the RF channel) from the actual phase to obtain the phase difference, i.e., the phase identifier. Afterwards, the BBU compares the phase identifier with the phase identifier pre-set for the RF channel. If they are consistent or the difference is within the preset range, it is determined that the connection between the RRU port and the antenna port in the RF channel is correct. Otherwise, it is determined that the connection between the RRU port and the antenna port in the RF channel is incorrect.

[0084] In a specific implementation, the RRU port, antenna port and phase identifier in each radio frequency channel may be correspondingly stored to indicate the connection relationship between the RRU port and the antenna port, and the storage method may be a mapping relationship table, etc. When it is determined that the connection between the RRU port and the antenna port in a certain radio frequency channel is wrong, the BBU may further modify the antenna port and its phase identifier corresponding to the RRU port in the radio frequency channel stored to the phase identifier and its corresponding antenna port obtained according to the sample.

[0085] Taking an eight-channel antenna as an example, an embodiment of a method for detecting a base station antenna RF channel connection relationship and channel calibration provided in the present application is further described in detail below.

[0086] The base station antenna 90 shown in Figure 10(a) includes a calibration board 91 and an array antenna. The calibration board 91 includes a calibration network and a carrier board thereof. The calibration network may be the calibration network provided by any of the above-mentioned embodiments. The array antenna is a 4-column dual-polarization radiation unit with a total of eight RF channels. Assume that the RRU ports are numbered P1, P2, ..., P8 from left to right, and the antenna ports are numbered A1, A2, ..., A8 from left to right. The calibration network marks the antenna ports A1, A2, ..., A8 as: 0°, 40°, 80°, ..., 280°, as shown in FIG. Fig.11 shown.

[0087] Before the base station is put into operation, in the BBU, according to the operation instructions of the operator and the connection relationship shown in FIG10(a), the antenna ports connected to the RRU ports of the eight RF channels and their phase identifiers are set and saved, and the saving method can be shown in the following Table 1. Among them, the phase identifier of the antenna port is the same as the phase identifier of the calibration network mark.

[0088] When the base station is running, the BBU sends test signals to each RF channel multiple times according to the connection relationship between the RRU port and the antenna port in the RF channel shown in Figure 10(a), and the slopes of the phase-frequency curves of the eight RF channels are K1, K2, ..., K8, respectively, and are saved in correspondence with the corresponding RF channel numbers, as shown in Table 1.

[0089] Table 1 RF channel connection relationship mapping table

[0090] RF channel number RRU Port Antenna Port Phase Mark Phase-frequency curve slope 1 P1 A1 0° K1 2 P2 A2 40° K2 3 P3 A3 80° K3 4 P4 A4 120° K4 5 P5 A5 160° K5 6 P6 A6 200° K6 7 P7 A7 240° K7 8 P8 A8 280° K8

[0091] In the above Table 1, the RRU port and the slope of the phase-frequency curve always correspond to the RF channel number shown in Table 1, or always keep consistent with the actual situation. Alternatively, the RF channel number column can be omitted in Table 1, and the RRU port is assumed to be the RF channel. The antenna port and phase mark corresponding to the RF channel number may not be consistent with Table 1 in actual situations. As shown in Figure 10(b), the wrong antenna port was connected due to the operator's error.

[0092] Afterwards, the BBU sends the test signal again and receives the combined signal fed back from the calibration network. Before or after the BBU sends the test signal again, the phase value (second phase value) of each RF channel signal itself (before the phase identifier is added) can be obtained according to the frequency of the test signal and the slope of the phase-frequency curve of each RF channel.

[0093] The BBU distinguishes samples from eight RF channels by restoring the PIN sequence header in the combined signal. The BBU extracts the phase values ​​(i.e., the first phase values) of the eight RF channels from the samples, and then subtracts the second phase value from the first phase value of each RF channel to obtain the phase identifier of the antenna port actually connected to the RRU port in each RF channel. Alternatively, when the calibration network adds a phase identifier by moving the phase of the coupled signal forward, the BBU can also subtract the first phase value from the second phase value to obtain the corresponding phase identifier. Fig.11 As shown in the figure, the phase identifiers of the antenna ports actually connected to RF channels 1 to 8 obtained by the BBU are: 0°, 240°, 80°, 120°, 160°, 200°, 40°, and 280°, respectively. By comparing with Table 1, it can be seen that the RRU port P2 of RF channel 2 is mistakenly connected to the antenna port A7, and the RRU port P7 of RF channel 7 is mistakenly connected to the antenna port A2.

[0094] In the case where the antenna port of the RF channel is connected incorrectly, the BBU can calibrate the connection relationship between the RRU port and the antenna port in the RF channel by modifying the antenna port and its phase identifier corresponding to (or mapped to) the RRU port. As shown in Table 2, the antenna port A2 and its phase identifier 40° in Table 1 above are swapped with the antenna port A7 and its phase identifier 240° to modify the connection relationship consistent with the actual connection situation. In this way, during actual operation, the BBU sets the amplitude and phase of each RF channel according to the connection relationship in Table 2, thereby solving the problem of the BBU incorrectly setting the amplitude and phase of each RF channel according to Table 1.

[0095] Table 2 Modified RF channel connection relationship mapping table

[0096] RF channel number RRU Port Antenna Port Phase Mark Phase-frequency curve slope 1 P1 A1 0° K1 2 P2 A7 240° K7 3 P3 A3 80° K3 4 P4 A4 120° K4 5 P5 A5 160° K5 6 P6 A6 200° K6 7 P7 A2 40° K2 8 P8 A8 280° K8

[0097] As a variation of this embodiment, the BBU can save the phase difference of adjacent antenna ports by 40°. After obtaining the actual phase identifier of each radio frequency channel, such as φ, the serial number of the antenna port actually connected to the RRU port in each radio frequency channel is obtained by the formula φ÷40°+1. In this case, the phase identifier column can be omitted in the above Table 1.

[0098] In the RF channel, due to the inconsistency of feeders, connectors, etc., the electrical length and loss of the feeder between the RRU and the antenna may be inconsistent, resulting in large fluctuations in the amplitude of the RF signal and inconsistent phases between different RF channels of the base station antenna. The present application provides a method for detecting the connection relationship of the RF channel of the base station antenna and channel calibration. After obtaining the connection relationship between the RRU and the port between the antennas (that is, knowing the antenna port actually connected to the RRU port) through the above-mentioned embodiment method, the BBU can further set the amplitude and phase of each RF channel according to the obtained phase identifier and the phase value of the sample to achieve channel calibration. For example, the phase identifier is removed from the phase value of the sample to obtain the phase value of the coupled signal; the amplitude and phase of the RF channel are set according to the phase value of the coupled signal. Assuming that the phase value of the sample fed back by the calibration network obtained by the BBU is Φ, the RF channel number (RRU port number) carried in the sample is M, and the corresponding phase identifier is ΔΦ obtained by the technical solution provided in the above embodiment, then the amplitude and phase of the RF channel M are set according to Φ-ΔΦ.

[0099] The above-mentioned embodiments of the present application only make minor modifications on the basis of the existing base station antenna calibration network, without adding parts, and the channel logic is simple. Compared with the prior art (the prior art one needs to integrate the standing wave point in the phase shifter of each channel, and the prior art two needs to integrate many devices), the embodiments of the present application can realize channel number detection and channel phase calibration at a lower cost. In addition, the embodiments of the present application are only implemented on the calibration channel. Compared with the changes in the radio frequency channel of the prior art one and the prior art two, it can reduce the loss and improve the stability of the system, such as reducing the passive intermodulation (PIM) index. Further, in the embodiments of the present application, after the BBU obtains the antenna port actually connected to the RRU port, it can make the antenna work normally by adjusting the internal RRU logic mapping. In this way, even if the connection line between the RRU and the antenna is installed incorrectly due to human factors in the actual application of the base station antenna, there is no need to correct it on the elevated tower of the base station, which effectively saves labor costs.

[0100] In a specific implementation, the present invention further provides a computer storage medium, wherein the computer storage medium may store a program, and when the program is executed, the program may include some or all of the steps in each embodiment of the simulation scene generation method provided by the present invention. The storage medium may be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0101] In a specific implementation, the present invention further provides a computer program product, wherein the computer program product includes executable instructions, and when the executable instructions are executed on a computer, the computer executes part or all of the steps in each embodiment of the simulation scene generation method provided by the present invention.

[0102] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention or some parts of the embodiments.

[0103] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the device embodiment and the terminal embodiment, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

Claims

1. A method for detecting the connection relationship of base station antenna radio frequency channels and channel calibration, characterized in that: Applied to a baseband device BBU, the method comprises: Receiving a sample from a calibration network, the sample being a coupled signal of a radio frequency channel in a base station antenna, a signal obtained after a phase identifier is added by the calibration network, the phase identifier being a phase value used to mark an antenna port in the radio frequency channel connected to a remote radio unit RRU port; The antenna port actually connected to the RRU port is acquired according to the phase identifier.

2. The method according to claim 1, characterized in that: After receiving the sample from the calibration network, the method further comprises: Acquire a first phase value, where the first phase value is a phase value of the sample; The phase identifier is obtained according to the second phase value and the first phase value; the second phase value is the phase value of the coupling signal.

3. The method according to claim 2, characterized in that The obtaining the phase identifier according to the second phase value and the first phase value includes: The second phase value is subtracted from the first phase value to obtain the phase identifier.

4. The method according to any one of claims 1 to 3, characterized in that: The obtaining, according to the phase identifier, an antenna port actually connected to the RRU port includes: The serial number of the antenna port actually connected to the RRU port is obtained by the formula φ÷Δφ+1, wherein φ is the phase identifier and Δφ is the phase difference between adjacent antenna ports.

5. The method according to any one of claims 1 to 4, characterized in that: After the antenna port actually connected to the RRU port is known according to the phase identifier, the method further includes: The RRU port is mapped to the antenna port actually connected to the RRU port.

6. The method according to any one of claims 1 to 5, characterized in that: After the antenna port actually connected to the RRU port is known according to the phase identifier, the method further includes: The amplitude and phase of the radio frequency channel are set according to the phase identifier and the phase value of the sample.

7. The method according to claim 6, characterized in that The step of setting the amplitude and phase of the radio frequency channel according to the phase identifier and the phase value of the coupled signal includes: Eliminating the phase identifier from the phase value of the sample to obtain the phase value of the coupling signal; The amplitude and phase of the radio frequency channel are set according to the phase value of the coupled signal.

8. A method for detecting the connection relationship of base station antenna radio frequency channels and channel calibration, characterized in that: Applied to a calibration network, the method comprises: Phase shift processing is performed on the coupled signals from n-1 radio frequency channels among the n radio frequency channels to obtain n-1 signals containing phase identifiers, where n≥2; the phase identifier is used to uniquely mark the antenna port connected to the RRU port in the radio frequency channel to which the respective signal belongs.

9. The method according to claim 8, characterized in that The phase identifier is a discrete value.

10. The method according to claim 9, characterized in that The phase identifier is an arithmetic difference value or a multiple distribution value.

11. The method according to any one of claims 8 to 10, characterized in that: The phase mark is less than or equal to 360°.

12. A calibration network, characterized in that: Applied to a base station antenna, the calibration network comprises: n-1 phase shift branches, respectively performing phase shift processing on coupled signals of n-1 radio frequency channels in n radio frequency channels, to obtain n-1 signals containing phase identifiers, wherein n≥2; the phase identifiers are used to uniquely mark the antenna ports connected to the RRU ports in the radio frequency channels to which the respective signals belong; A splitter / combiner comprises a combining end and n input ends, wherein the n input ends are used to receive coupling signals of the n radio frequency channels, n-1 of the n input ends are used to receive coupling signals of the n-1 radio frequency channels, the n-1 phase-shifting branches are connected to the n-1 input ends, the reference branches of the n-1 phase-shifting branches are connected to the reference input end, and the reference input end is an input end of the n input ends except the n-1 input end; the combining end is used to combine the n-1 signals containing phase identifiers and the coupling signal received by the reference input end into one path and output the result.

13. The calibration network according to claim 12, characterized in that The phase-frequency curve slopes of the n-1 phase-shift branches are the same as that of the reference branch, and the lengths thereof are related to the phase identifier.

14. The calibration network according to claim 12 or 13, characterized in that The n radio frequency channels include a first radio frequency channel, a second radio frequency channel, a third radio frequency channel and a fourth radio frequency channel, wherein the first radio frequency channel is a radio frequency channel among the n radio frequency channels except the n-1 radio frequency channel; The splitter / combiner includes a first-stage splitter / combiner and a second-stage splitter / combiner; the n-1 phase-shifting branches include a first phase-shifting branch, a second phase-shifting branch and a third phase-shifting branch; The first-stage splitter / combiner includes a first splitter / combiner and a second splitter / combiner; the second-stage splitter / combiner includes a third splitter / combiner; The first input end of the first splitter / combiner is connected to the reference branch for receiving the coupled signal of the first RF channel, and the second input end is connected to the first phase shift branch for receiving the coupled signal of the second RF channel and changing the phase of the coupled signal of the second RF channel; The first input end of the second splitter / combiner is used to receive the coupled signal of the third RF channel, and the second input end is connected to the second phase shift branch, and is used to receive the coupled signal of the fourth RF channel and change the phase of the coupled signal of the fourth RF channel; The first input end of the third splitter / combiner is connected to the combining end of the first splitter / combiner, and the second input end is connected to the combining end of the second splitter / combiner through the third phase-shifting branch.

15. The calibration network according to claim 14, characterized in that The n radio frequency channels also include a fifth radio frequency channel, a sixth radio frequency channel, a seventh radio frequency channel and an eighth radio frequency channel; the first-level splitter / combiner also includes a fourth splitter / combiner and a fifth splitter / combiner; the second-level splitter / combiner also includes a sixth splitter / combiner; the splitter / combiner also includes a third-level splitter / combiner; the third-level splitter / combiner also includes a seventh splitter / combiner; the phase-shift branch also includes a fourth phase-shift branch, a fifth phase-shift branch, a sixth phase-shift branch and a seventh phase-shift branch; The combining end of the third splitter / combiner is connected to the first input end of the seventh splitter / combiner, and the second input end of the seventh splitter / combiner is connected to the combining end of the sixth splitter / combiner through the fourth phase-shifting branch; The first input end of the sixth splitter / combiner is connected to the combining end of the fourth splitter / combiner, and the second input end is connected to the combining end of the fifth splitter / combiner through the fifth phase-shifting branch; the first input end of the fourth splitter / combiner is used to receive the coupled signal of the fifth RF channel, and the second input end is connected to the sixth phase-shifting branch, and is used to receive and change the phase of the coupled signal of the sixth RF channel; The first input end of the fifth splitter / combiner is used to receive the coupled signal of the seventh RF channel, and the second input end is connected to the seventh phase-shifting branch, and is used to receive and change the phase of the coupled signal of the eighth RF channel.

16. The calibration network according to any one of claims 12 to 15, characterized in that: The splitter / combiner is a T-shaped power splitter or a Wilkinson power splitter.

17. The calibration network according to any one of claims 12 to 16, characterized in that: The phase identifier is a discrete value.

18. The calibration network according to any one of claims 12 to 17, characterized in that The phase identifier is an arithmetic difference value or a multiple distribution value.

19. The calibration network according to any one of claims 12 to 18, characterized in that The phase mark is less than or equal to 360°.

20. The calibration network according to any one of claims 12 to 19, characterized in that The n-1 phase-shifting branches each include: a first transmission line, a first short-circuit line, and a second short-circuit line, wherein the first transmission line is connected to a corresponding input end among the n-1 input ends, the lengths of the first short-circuit line and the second short-circuit line are both one-quarter of the wavelength of the coupling signal, one end of the first short-circuit line and the second short-circuit line is grounded, and the other end is connected to the first transmission line, and the distance between the first short-circuit line and the second short-circuit line is one-quarter of the wavelength of the coupling signal, or the other ends of the first short-circuit line and the second short-circuit line are open-circuited, and the middle point is connected to the first transmission line, and the distance between the first short-circuit line and the second short-circuit line is one-half of the wavelength of the coupling signal; The reference branch is a second transmission line connected to the reference input terminal; A length difference between the first transmission line and the second transmission line is related to the phase identifier.

21. A base station antenna, characterized in that: include: An array antenna and a calibration network as described in any one of claims 12 to 20, wherein the array antenna comprises n antenna ports, which are coupled and connected to n input ports of the calibration network accordingly.

22. A device for detecting the connection relationship of radio frequency channels of base station antennas and channel calibration, characterized in that: Applied to BBU, the device comprises: A receiving module, used to receive a sample from a calibration network, wherein the sample is a coupled signal of a radio frequency channel in a base station antenna, and a signal obtained after a phase identifier is added by the calibration network, wherein the phase identifier is a phase value used to mark an antenna port connected to an RRU port in the radio frequency channel; The identification module is used to obtain the antenna port actually connected to the RRU port according to the phase identifier.

23. The device according to claim 22, characterized in that Also includes: A first acquisition module, configured to acquire a first phase value after the receiving module receives the sample from the calibration network, wherein the first phase value is a phase value of the sample; A second acquisition module is configured to obtain the phase identifier according to a second phase value and the first phase value; the second phase value is the phase value of the coupling signal.

24. The device according to claim 23, characterized in that The second acquisition module is further used to: subtract the second phase value from the first phase value to obtain the phase identifier.

25. The device according to any one of claims 22 to 24, characterized in that The identification module is also used for: The serial number of the antenna port actually connected to the RRU port is obtained by the formula φ÷Δφ+1, wherein φ is the phase identifier and Δφ is the phase difference between adjacent antenna ports.

26. The device according to any one of claims 22 to 25, characterized in that Also includes: The adjustment module is used to map the RRU port to the antenna port actually connected to the RRU port after the identification module learns the antenna port actually connected to the RRU port according to the phase identifier.

27. The device according to any one of claims 22 to 26, characterized in that Also includes: The amplitude and phase setting module is used to set the amplitude and phase of the radio frequency channel according to the phase identifier and the phase value of the sample after the identification module learns the antenna port actually connected to the RRU port according to the phase identifier.

28. The device according to claim 27, characterized in that The amplitude and phase setting module is also used for: Eliminating the phase identifier from the phase value of the sample to obtain the phase value of the coupling signal; The amplitude and phase of the radio frequency channel are set according to the phase value of the coupled signal.

29. A BBU, characterized in that: The invention comprises a device for detecting the connection relationship of radio frequency channels of base station antennas and channel calibration as described in any one of claims 22 to 28 above.

30. An electronic device, characterized in that: The electronic device comprises a memory for storing computer program instructions and a processor for executing the program instructions, wherein when the computer program instructions are executed by the processor, the electronic device executes the method according to any one of claims 1 to 7.

31. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

32. A computer program product, characterized in that The computer program product comprises executable instructions, and when the executable instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 7.

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