Wireless repeater

Abstract

The purpose of the present invention is to solve the problem of an increase in size by integrating system configurations of two systems into one system in an intermediate band. The present invention is provided with a first unit, a second unit, and a single cable connecting the first unit and the second unit. The first unit includes N donor antennas from a first donor antenna to an Nth donor antenna that communicate with a base station, a first connection unit connected to an analog cable, and N donor-side frequency conversion units from a donor-side first frequency conversion unit to a donor-side Nth frequency conversion unit (where N is an integer of 2 or more). Each of the N donor-side frequency conversion units from the donor-side first frequency conversion unit to the donor-side Nth frequency conversion unit converts a signal of a frequency fRF received by a corresponding donor antenna among the N donor antennas from the first donor antenna to the Nth donor antenna into an intermediate signal by means of a local signal of each of the N donor-side frequency conversion units. The frequencies of the local signal and the intermediate signal differ from each other by the donor-side frequency conversion unit. The second unit is provided with: N service antennas from first to Nth service antennas that communicate with the communication terminal; the second connecting part is connected with the analog cable; and N service-side frequency conversion units from the service-side first frequency conversion unit to the service-side Nth frequency conversion unit. Each of the N service-side frequency conversion units from the service-side first frequency conversion unit to the service-side Nth frequency conversion unit converts a signal of a frequency fRF received by a corresponding service antenna among the N service antennas from the first service antenna to the Nth service antenna into an intermediate signal, which is an analog signal, by means of a local signal of each of the N service-side frequency conversion units. The frequencies of the local signal and the intermediate signal differ from each other for each service-side frequency conversion unit. Intermediate signals of the first to Nth intermediate signals are transmitted in an overlapping manner in one cable.

Description

Technical Field

[0001] This invention relates to wireless repeaters, and more particularly to a simplified structure for a wireless repeater for millimeter-wave band mobile communication systems, such as those used in the 28 GHz band of the 5G standard. Background Technology

[0002] In 5G standards and similar technologies, as the frequency used for communication increases, the directness of radio waves increases. This makes radio wave-based communication difficult when there are buildings or other structures between the base station and the communication terminal. Therefore, wireless repeaters are often used instead.

[0003] A wireless repeater consists of a donor unit that transmits and receives data with a base station (BS) and a service unit that transmits and receives data with a user terminal (UE). It is used, for example, in situations where a direct wireless link between the base station and the user terminal cannot be established due to obstacles or the like (Patent Document 1).

[0004] In reference 1 Figure 4 An example of the structure of a wireless repeater is shown in the figure.

[0005] In wireless repeaters, in the case of analog wiring, from the viewpoint of reducing the feeder loss of coaxial cables, the connection is made by frequency conversion to an intermediate frequency band lower than the wireless frequency (Patent Document 1).

[0006] A wireless repeater consists of a donor unit, a service unit, and a coaxial cable connecting the two.

[0007] Addressing MIMO in wireless repeaters and other applications in 5G millimeter-wave mobile communication systems.

[0008] In such a wireless repeater, both the BS and UE use two antennas for MIMO communication, forming a two-path wireless link in the same frequency band (fRF).

[0009] For MIMO communication, two antennas are required in the wireless repeater, i.e., two paths under fRF. Especially when using analog cables such as coaxial cables, two cables are required if directly constructed, resulting in poor setup. If digital, the cables are combined into one, but digital processing units are required in the donor unit and service unit respectively, increasing the size of the wireless repeater and further deteriorating setup in this case.

[0010] Synchronization functions are also used in wireless repeaters and other applications in 5G millimeter-wave mobile communication systems.

[0011] In 5G or millimeter-wave bands, transmit / receive handover is performed using TDD (Time Division Duplex). Therefore, the BS / UEs use synchronization signals specified in 5G communication to ensure consistent timing during transmit / receive handover.

[0012] For synchronization, a so-called synchronization module is also needed in the wireless repeater, which has the function of demodulating the 5G signal and extracting the synchronization signal. This synchronization function is implemented in the mid-band, but when the two systems are wired separately, a synchronization module is required in each system, thus leading to the increase in the size of the device.

[0013] Here, the synchronization signal can be confirmed in both systems or in either system by transmitting waves from the BS side.

[0014] In these wireless repeaters, the two systems are wired separately. For example, wireless repeaters in the 5G standard are designed to handle MIMO, such as... Figure 1 as well as Figure 2 As shown, the system architecture uses two systems.

[0015] Existing technical documents

[0016] Patent documents

[0017] Patent Document 1: Japanese Patent Application Publication No. 2022-67016 Summary of the Invention

[0018] The problem that the invention aims to solve

[0019] In a two-system architecture, only one local signal and one intermediate frequency are needed, but coaxial cables for both systems are required, as well as synchronization modules for both systems. Therefore, a demodulator is included, resulting in high cost and large device size.

[0020] In particular, while analog cabling between donor and service units is advantageous for miniaturizing the device, it requires two coaxial cables, leading to performance degradation. Furthermore, TDD synchronization in wireless repeaters involves demodulating the 5G synchronization signal from the base station; however, since the repeater doesn't know which system the synchronization signal is from, synchronization modules for two systems are needed, resulting in larger device sizes.

[0021] For example, the purpose of this invention is to address the issue of large-scale operation by combining the system architectures of two systems into one system in the intermediate frequency band, while also addressing MIMO through wireless repeaters in the 5G standard.

[0022] Additionally, for example, the present invention aims to solve the problem of large-scale operation by switching local signals via synchronization signals when dealing with MIMO through wireless repeaters in the 5G standard.

[0023] Furthermore, the object of the present invention is to solve the problem of needing a synchronization module in each system when two systems are wired separately, in the case of TDD-based transmit / receive switching in millimeter-wave bands of 5G standards, and in structures that use synchronization signals and keep the transmit / receive switching timing consistent, by using a structure that satisfies the above-mentioned functions with a single synchronization module.

[0024] Other objects of the invention are also described in the manner in which the invention is carried out.

[0025] Methods for solving problems

[0026] A wireless repeater according to an embodiment of the present invention,

[0027] It includes a first unit, a second unit, and a cable connecting the first unit and the second unit.

[0028] Unit 1 includes:

[0029] N donor antennas, from the first donor antenna to the Nth donor antenna, that communicate with the base station;

[0030] The first connection part connected to the cable; and

[0031] N donor-side frequency conversion units, from the first donor-side frequency conversion unit to the Nth donor-side frequency conversion unit.

[0032] Where N is an integer greater than or equal to 2.

[0033] The N donor-side frequency conversion units, from the first donor-side frequency conversion unit to the Nth donor-side frequency conversion unit, respectively convert the frequency fRF signal received by the corresponding donor antenna among the N donor antennas from the first donor antenna to the Nth donor antenna into an intermediate signal as an analog signal, which is from the first intermediate signal to the Nth intermediate signal, using their respective local signals.

[0034] The frequencies of the local signal and the intermediate signal differ from each other according to the donor-side frequency converter.

[0035] Unit Two includes:

[0036] The N service antennas that communicate with the communication terminal, from the first service antenna to the Nth service antenna;

[0037] The second connection part that connects to the cable; and

[0038] N service-side frequency conversion units, from the first service-side frequency conversion unit to the Nth service-side frequency conversion unit.

[0039] The N service-side frequency conversion units, from the first service-side frequency conversion unit to the Nth service-side frequency conversion unit, respectively convert the frequency fRF signal received by the corresponding service antenna among the N service antennas from the first service antenna to the Nth service antenna into an intermediate signal as an analog signal, which is from the first intermediate signal to the Nth intermediate signal, using their respective local signals.

[0040] The frequencies of the local signal and the intermediate signal differ from each other according to the frequency conversion unit on the service side.

[0041] The cable allows intermediate signals, which are analog signals, to pass through.

[0042] The intermediate signals from the first intermediate signal to the Nth intermediate signal are transmitted in an overlapping manner in a single cable.

[0043] In one embodiment of the present invention, the wireless repeater further includes a donor-side combiner connected between the donor antenna and the cable, and a service-side combiner connected between the service antenna and the cable.

[0044] In one embodiment of the present invention, the wireless repeater further includes a donor-side filter connected between the donor antenna and the cable, and a service-side filter connected between the service antenna and the cable.

[0045] The wireless repeater in one embodiment of the present invention further comprises: a donor-side combiner connected between the donor antenna and the cable, a service-side combiner connected between the service antenna and the cable, a donor-side filter connected between the donor antenna and the cable, and a service-side filter connected between the service antenna and the cable.

[0046] A wireless repeater in one embodiment of the present invention,

[0047] The donor-side synthesizer and distributor and the donor-side filter are integrated into a donor-side multiplexer.

[0048] The server-side synthesizer and distributor and the server-side filter are integrated into a server-side multiplexer.

[0049] A wireless repeater in one embodiment of the present invention,

[0050] The first intermediate signal to the Nth intermediate signal each have a predetermined bandwidth.

[0051] The frequency bands from the first intermediate signal to the Nth intermediate signal are separated from the adjacent frequency bands by a predetermined frequency band.

[0052] A wireless repeater in one embodiment of the present invention,

[0053] It also includes a synchronization signal acquisition unit, a donor-side local signal switching unit, and a service-side local signal switching unit.

[0054] The first unit includes a first demodulator and a first synchronization module connected to the first connection part.

[0055] The second unit includes a second demodulator and a second synchronization module connected to the second connection part.

[0056] The synchronization signal acquisition unit obtains the synchronization signal by switching the donor-side local signal through the donor-side local signal switching unit based on the demodulation result in the first demodulator, or by switching the service-side local signal through the service-side local signal switching unit based on the demodulation result in the second demodulator.

[0057] A wireless repeater in one embodiment of the present invention,

[0058] The donor-side local signal switching unit and the service-side local signal switching unit also have donor-side switching transceivers and service-side switching transceivers, respectively.

[0059] When one of the donor-side local signal switching unit and the server-side local signal switching unit switches the local signal, the local signal switching signal is transmitted to the other party via the donor-side switching transceiver unit and the server-side switching transceiver unit.

[0060] The donor-side local signal switching unit and the service-side local signal switching unit select the frequency of the local signal.

[0061] Invention Effects

[0062] Through the above structure, the present invention enables transmission in two systems using a single coaxial cable by sharing the transmission path in the intermediate frequency band, thus simplifying the configuration.

[0063] Furthermore, the present invention, through the above structure, enables 5G synchronization using a single synchronization module, thus achieving miniaturization compared to existing devices. Additionally, by appropriately switching the local signal, the signal-to-noise ratio (SN) during demodulation can be improved, achieving stable and efficient synchronization.

[0064] Furthermore, through the above structure, the present invention can not only reduce costs by reducing the number of components, but also achieve miniaturization and improved performance.

[0065] Other effects of the invention are also described in the manner in which the invention is carried out. Attached Figure Description

[0066] Figure 1 This shows a typical example of a wireless repeater structure.

[0067] Figure 2 This shows a typical example of a wireless repeater structure.

[0068] Figure 3 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0069] Figure 4 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0070] Figure 5 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0071] Figure 6 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0072] Figure 7 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0073] Figure 8 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0074] Figure 9 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0075] Figure 10 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0076] Figure 11 An example of the structure of a wireless repeater in one embodiment of the present invention is shown.

[0077] Figure 12 The frequency configuration of a wireless repeater in one embodiment of the present invention is shown.

[0078] Figure 13 An example of the structure of a wireless repeater in one embodiment of the present invention is shown. Detailed Implementation

[0079] Figure 3 , Figure 4 as well as Figure 5 This illustrates a structural example of a wireless repeater 1 in one embodiment of the present invention.

[0080] In part of the following example, for ease of understanding, examples of donor antennas 101, 102, ..., 10N and service antennas 201, 202, ..., 20N, each consisting of two systems, will be shown. However, the same applies to cases with more than two N.

[0081] The wireless repeater 1 includes a first unit 100, a second unit, and a cable 300 connecting the first unit 100 and the second unit.

[0082] The first unit 100 includes N donor antennas 101, 102, ..., 10N, a first connection portion 110 connected to the analog cable 300, and N donor-side frequency conversion portions 111, 112, ..., 11N from the donor-side first frequency conversion portion to the donor-side Nth frequency conversion portion, wherein N is an integer greater than or equal to 2. In this embodiment, N is 2.

[0083] N donor antennas 101, 102, ..., 10N are the donor antennas 101, 102, ..., 10N that communicate with the base station from the first donor antenna 101, 102, ..., 10N to the Nth donor antenna 101, 102, ..., 10N.

[0084] The N donor-side frequency conversion units 111, 112, ..., 11N, from the first donor antenna 101, 102, ..., 10N to the Nth donor antenna 101, 102, ..., 10N, respectively convert the frequency fRF signal received by the corresponding donor antenna 101, 102, ..., 10N from the first donor antenna 101, 102, ..., 10N to the Nth donor antenna 101, 102, ..., 10N into an intermediate signal as an analog signal, from the first intermediate signal to the Nth intermediate signal, through their respective local signals.

[0085] Here, the frequencies of the local signal and the intermediate signal are different according to the donor-side frequency conversion units 111, 112, ..., 11N.

[0086] The second unit includes N service antennas 201, 202, ..., 20N, a second connection section connected to an analog cable 300, and N service-side frequency conversion sections 211, 212, ..., 21N from the service-side first frequency conversion section to the service-side Nth frequency conversion section.

[0087] N service antennas 201, 202, ..., 20N are used to communicate with the communication terminal. The service antennas 201, 202, ..., 20N are from the first service antenna 201, 202, ..., 20N to the Nth service antenna 201, 202, ..., 20N.

[0088] The N service-side frequency conversion units 211, 212, ..., 21N from the first service antenna 201, 202, ..., 20N to the Nth service antenna 201, 202, ..., 20N respectively convert the frequency fRF signal received by the corresponding service antenna 201, 202, ..., 20N from the first service antenna 201, 202, ..., 20N to the Nth service antenna 201, 202, ..., 20N into an intermediate signal as an analog signal, which is from the first intermediate signal to the Nth intermediate signal, through their respective local signals.

[0089] The frequencies of the local signal and the intermediate signal are different according to the frequency conversion units 211, 212, ..., 21N on the service side.

[0090] Cable 300 allows intermediate signals, which are analog signals, to pass through, and is a cable 300 that allows analog signals to pass through appropriately. As in this embodiment, it has a structure that does not have a digital processing unit for the intermediate signal, and therefore does not require a digital processing unit.

[0091] The intermediate signals from the first intermediate signal to the Nth intermediate signal are transmitted in an overlapping manner in a single cable 300.

[0092] The scope of the patent protection sought and the meaning of "overlapping transmission" in this description also include structures with non-overlapping time periods depending on the timing of the signal, meaning that signal processing can be performed without problems even with overlapping transmission.

[0093] The local signal and the intermediate signal do not have to be fixed. That is, as long as they are combined into one, they can be at different frequencies for each overlapping signal.

[0094] In this embodiment, the high-frequency band fRF signals of the donor antennas 101, 102, ..., 10N and the service antennas 201, 202, ..., 20N are frequency-transformed into other intermediate frequency bands with frequencies fIF1 and fIF2 by local signals at frequencies fLO1 and fLO2, respectively. Here, fIF1 is less than fIF2.

[0095] Signals in the intermediate frequency bands fIF1 and fIF2 are superimposed on the transmission path of a system through an intermediate frequency band duplexer, thereby enabling cabling between the donor and service units via a single coaxial cable 300.

[0096] The cable 300 can be a digital cable 300 or a wireless communication cable, but it can also be an analog cable 300 such as a coaxial cable 300 as in this embodiment. If it is an analog cable 300, there is no need for an analog-to-digital converter, etc., the circuit structure becomes simple, and thus the overall device can be miniaturized.

[0097] Figure 6 This illustrates a structural example of a wireless repeater 1 in one embodiment of the present invention.

[0098] In this embodiment, the wireless repeater 1 includes a donor-side combiner 121 connected between donor antennas 101, 102, ..., 10N and cable 300, and a service-side combiner 221 connected between service antennas 201, 202, ..., 20N and cable 300.

[0099] Figure 7 This illustrates a structural example of a wireless repeater 1 in one embodiment of the present invention.

[0100] In this embodiment, the wireless repeater 1 includes a donor-side filter 122 connected between the donor antennas 101, 102, ..., 10N and the cable 300, and a service-side filter 222 connected between the service antennas 201, 202, ..., 20N and the cable 300.

[0101] Figure 8 This illustrates a structural example of a wireless repeater 1 in one embodiment of the present invention.

[0102] In this embodiment, the wireless repeater 1 includes: a donor-side combiner / distributor 121 connected between donor antennas 101, 102, ..., 10N and cable 300; a service-side combiner / distributor 221 connected between service antennas 201, 202, ..., 20N and cable 300; a donor-side filter 122 connected between donor antennas 101, 102, ..., 10N and cable 300; and a service-side filter 222 connected between service antennas 201, 202, ..., 20N and cable 300.

[0103] Figure 9 This illustrates a structural example of a wireless repeater 1 in one embodiment of the present invention.

[0104] In this embodiment, in the wireless repeater 1, the donor-side synthesizer 121 and the donor-side filter 122 are integrally configured as a donor-side multiplexer 120.

[0105] The service-side combiner / distributor 221 and the service-side filter 222 are integrally configured as a service-side multiplexer 220. In the case of two antennas, this embodiment becomes a duplexer. The scope of the patent claim and the term "multiplexer" in this description include duplexers.

[0106] In one embodiment of the present invention, the first unit 100 includes a first demodulator 131 and a first synchronization module 132 connected to the first connection portion 110. The first synchronization module 132 performs switching of donor-side frequency conversion portions 111 and 112 and switching of local signals based on the demodulation result in the first demodulator 131.

[0107] In one embodiment of the present invention, the second unit includes a second demodulator 231 and a second synchronization module 232 connected to the second connection section. The second synchronization module 232 performs switching of the service-side frequency conversion sections 211 and 212 and switching of the local signal based on the demodulation result in the second demodulator 231.

[0108] Figure 10 This illustrates a structural example of a wireless repeater 1 in one embodiment of the present invention.

[0109] In this embodiment, the first unit 100 includes a first demodulator 131 and a first synchronization module 132 connected to the first connection portion 110. Additionally, the second unit includes a second demodulator 231 and a second synchronization module 232 connected to the second connection portion.

[0110] The wireless repeater 1 in this embodiment also includes a synchronization signal acquisition unit 133, 233, a donor-side local signal switching unit 134, and a server-side local signal switching unit 234.

[0111] The first unit 100 includes a first demodulator 131 and a first synchronization module 132 connected to the first connection portion 110. The second unit includes a second demodulator 231 and a second synchronization module 232 connected to the second connection portion.

[0112] The synchronization signal acquisition unit 133 obtains the synchronization signal by switching the donor-side local signal through the donor-side local signal switching unit 134 based on the demodulation result in the first demodulator 131, or the synchronization signal acquisition unit 233 obtains the synchronization signal by switching the service-side local signal through the service-side local signal switching unit 234 based on the demodulation result in the second demodulator 231.

[0113] Figure 11 This illustrates a structural example of a wireless repeater 1 in one embodiment of the present invention.

[0114] In this embodiment, the donor-side local signal switching unit 134 and the service-side local signal switching unit 234 also each have a donor-side switching transceiver unit 135 and a service-side switching transceiver unit 235. Furthermore, when one of the donor-side local signal switching unit 134 and the service-side local signal switching unit 234 switches the local signal, the local signal switching signal is transmitted to the other party via the donor-side switching transceiver unit 135 and the service-side switching transceiver unit 235, and the other party of the donor-side local signal switching unit 134 and the service-side local signal switching unit 234 selects the frequency of the local signal.

[0115] In this way, the frequency information of the local signal from the unit that has undergone local signal switching control is received in a unit that is different from the unit that has undergone local signal switching control, so that the frequency of the local signal is consistent.

[0116] The synchronization module obtains the synchronization signal by demodulating fIF1. Since only one synchronization module is needed, it is small and low-cost.

[0117] In one embodiment of the present invention, when the first synchronization module 132 and the second synchronization module 232 of the wireless repeater 1 have an intermediate signal in the intermediate signal in which the synchronization signal cannot be obtained, they perform local signal switching control and search for an intermediate frequency signal containing the synchronization signal.

[0118] That is, in this embodiment, when the synchronization signal is obtained from both sides of the two systems, no special effort is required. When it can only be obtained from one side of antennas 1 and 2, the two local signals, frequency fLO1 and frequency fLO2, are switched, and the side that obtains the synchronization signal is set as fIF1.

[0119] Figure 12 This indicates the frequency configuration of the wireless repeater 1 in one embodiment of the present invention.

[0120] In this embodiment, the first intermediate signal to the Nth intermediate signal each have a predetermined bandwidth D1.

[0121] The frequency band from the first intermediate signal to the frequency band of the Nth intermediate signal is separated from the adjacent frequency band by a predetermined frequency band D2.

[0122] In this embodiment, fRF = 28.0 GHz ± 200 MHz (400 MHz width), fIF1 = 3.0 GHz ± 200 MHz (400 MHz width), and fIF2 = 3.6 GHz ± 200 MHz (400 MHz width). The values ​​of fLO1 and fLO2 are determined according to the mixer specifications.

[0123] For example, the signals received from donor antennas 101 and 102 have different paths and the same frequency in the RF band, i.e., the high-frequency band where the antenna transmits and receives signals from the outside. On the other hand, in the IF band, i.e., the intermediate frequency band where the antenna transmits and receives signals from the outside, the paths are the same but the frequencies are different.

[0124] Figure 13 It is a structure that generalizes to an N-system by setting N to an integer greater than 2.

[0125] The local signal is switched with the lowest frequency of the system that obtains the synchronization signal, and with the lowest frequency of the intermediate frequency band extracted by the synchronization module. Thus, even in an N system, the same effect as in a 2 system can be obtained.

[0126] This invention is not limited to the above embodiments, but includes various embodiments without departing from the spirit of the invention.

[0127] Symbol Explanation

[0128] 1. Wireless repeater;

[0129] Unit 1, 100;

[0130] 101, 102, 10N donor antennas;

[0131] 110 First connecting part;

[0132] 111, 112, 11N donor-side frequency conversion section;

[0133] 120 donor-side multiplexer;

[0134] 121 Donor-side synthesizer / distributor;

[0135] 122 donor-side filter;

[0136] 131 First Demodulator;

[0137] 132 First Synchronization Module;

[0138] 133 Synchronization Signal Acquisition Unit;

[0139] 134 Donor-side local signal switching unit;

[0140] 135 Donor-side switching transceiver unit;

[0141] Unit 2, 200;

[0142] 201, 202, and 20N service antennas;

[0143] 210 Second connecting part;

[0144] 211, 212, 21N service-side frequency conversion units;

[0145] 220 service-side multiplexer;

[0146] 221 Server-side synthesizer / distributor;

[0147] 222 Service-side filter;

[0148] 231 Second Demodulator;

[0149] 232 Second Synchronization Module;

[0150] 233 Synchronization Signal Acquisition Unit;

[0151] 234 Service-side local signal switching unit;

[0152] 235 Server-side switching transceiver unit;

[0153] 300 cable;

[0154] 401 sent to the front end;

[0155] 402 Receiver Front End;

[0156] 403 multiplier;

[0157] 404 bandpass filter;

[0158] BS base station;

[0159] UE terminal;

[0160] DU donor unit;

[0161] SU service unit;

[0162] The bandwidth predetermined by D1;

[0163] The bandwidth of D2 is predetermined.

Claims

1. A wireless repeater characterized by comprising a first unit, a second unit, and a cable connecting the first unit and the second unit, the first unit comprising: N donor antennas of a first donor antenna to an Nth donor antenna that communicate with a base station; a first connection section connected to the cable; and N donor side frequency conversion sections of a first donor side frequency conversion section to an Nth donor side frequency conversion section, wherein N is an integer of 2 or more, the N donor side frequency conversion sections from the first donor side frequency conversion section to the Nth donor side frequency conversion section each convert a signal of a frequency fRF received through a corresponding one of the N donor antennas from the first donor antenna to the Nth donor antenna into an intermediate signal that is an analog signal from a first intermediate signal to an Nth intermediate signal using a respective local signal, the frequencies of the local signals and the intermediate signals being different from each other according to the donor side frequency conversion sections, the second unit comprising: N service antennas of a first service antenna to an Nth service antenna that communicate with a communication terminal; a second connection section connected to the cable; and N service side frequency conversion sections of a first service side frequency conversion section to an Nth service side frequency conversion section, the N service side frequency conversion sections from the first service side frequency conversion section to the Nth service side frequency conversion section each convert a signal of a frequency fRF received through a corresponding one of the N service antennas from the first service antenna to the Nth service antenna into an intermediate signal that is an analog signal from a first intermediate signal to an Nth intermediate signal using a respective local signal, the frequencies of the local signals and the intermediate signals being different from each other according to the service side frequency conversion sections, the cable passes the intermediate signals that are analog signals, the intermediate signals from the first intermediate signal to the Nth intermediate signal are transmitted overlapped in the one cable.

2. The wireless repeater according to claim 1, characterized in that the wireless repeater further comprises a donor side combining distributor connected between the donor antennas and the cable, and a service side combining distributor connected between the service antennas and the cable.

3. The wireless repeater according to claim 1, characterized in that the wireless repeater further comprises a donor side filter connected between the donor antennas and the cable, and a service side filter connected between the service antennas and the cable.

4. The wireless repeater according to claim 1, characterized in that the wireless repeater further comprises a donor side combining distributor connected between the donor antennas and the cable, a service side combining distributor connected between the service antennas and the cable, a donor side filter connected between the donor antennas and the cable, and a service side filter connected between the service antennas and the cable.

5. The wireless repeater according to claim 4, characterized in that the donor side combining distributor and the donor side filter are integrated as a donor side multiplexer, ​ The service-side synthesis distributor and the service-side filter are integrally configured as a service-side multiplexer.

6. The wireless repeater according to claim 1, wherein the first intermediate signal to the Nth intermediate signal each have a predetermined frequency bandwidth, the frequency band of the first intermediate signal to the frequency band of the Nth intermediate signal are separated from adjacent frequency bands by a predetermined frequency band.

7. The wireless repeater according to any one of claims 1 to 6, wherein the wireless repeater further includes a synchronization signal acquisition unit, a donor-side local signal switching unit, and a service-side local signal switching unit, the first unit includes a first demodulator connected to the first connection unit and a first synchronization module, the second unit includes a second demodulator connected to the second connection unit and a second synchronization module, the synchronization signal acquisition unit acquires a synchronization signal by switching a donor-side local signal by the donor-side local signal switching unit based on a demodulation result in the first demodulator, or acquires a synchronization signal by switching a service-side local signal by the service-side local signal switching unit based on a demodulation result in the second demodulator.

8. The wireless repeater according to claim 7, wherein the donor-side local signal switching unit and the service-side local signal switching unit each further include a donor-side switching transceiver and a service-side switching transceiver, when one of the donor-side local signal switching unit and the service-side local signal switching unit switches a local signal, a local signal switching signal is transmitted to the other via the donor-side switching transceiver and the service-side switching transceiver, the other of the donor-side local signal switching unit and the service-side local signal switching unit selects a frequency of the local signal.

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