CN117676607A

CN117676607A - Indoor coverage system for wireless communication

Info

Publication number: CN117676607A
Application number: CN202211097498.9A
Authority: CN
Inventors: 孙华荣; 王东方; 倪慧娟
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2024-03-08

Abstract

The application discloses a wireless communication indoor coverage system, which comprises an indoor baseband processing unit, at least one remote radio unit and at least one cascaded active distributed antenna; the indoor baseband processing unit is connected with each remote radio unit through an optical fiber; each remote radio unit is provided with at least one antenna interface which is used for being connected with the cascade active distributed antenna; each cascaded active distributed antenna comprises a cascaded radio frequency cable and active antennas, each active antenna is provided with a radio frequency remote unit interface and a cascaded interface, the radio frequency remote unit interface is used for being connected with the radio frequency cable, and the cascaded interface is used for being connected with the radio frequency remote unit interface of the lower active antenna through the radio frequency cable. The system has the advantages of low cost, good signal coverage, low power consumption, strong expandability and convenient installation.

Description

Indoor coverage system for wireless communication

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to an indoor coverage system for wireless communications.

Background

The indoor coverage system for Wireless communication refers to amplifying and distributing weak Wireless communication signals (including public mobile communication signals, wi-Fi (Wireless Fidelity) signals and the like) in large public places (such as office buildings, shopping malls, exhibition centers, underground garages and the like) and uniformly covering places where the public arrives.

It is counted that 70% of mobile communication traffic occurs indoors, so indoor coverage (or indoor distribution or indoor segmentation) is an important part of mobile communication construction. However, the construction of the indoor coverage system for wireless communication has the problems of inconvenient construction and maintenance, poor signal coverage and large overall investment due to complex environment and a large number of partitions. Therefore, the method has important significance for both coverage and performance and cost reduction.

Disclosure of Invention

The application provides a wireless communication indoor coverage system.

According to an aspect of the present application, there is provided a wireless communication indoor coverage system, including: the system comprises an indoor baseband processing unit, at least one remote radio unit and at least one cascaded active distributed antenna; wherein,

the indoor baseband processing unit is connected with each remote radio unit through an optical fiber;

each remote radio unit is provided with at least one antenna interface, and the antenna interfaces are used for being connected with the cascaded active distributed antennas;

each cascaded active distributed antenna comprises a plurality of cascaded radio frequency cables and active antennas, each active antenna is provided with a radio frequency remote unit interface and a cascade interface, the radio frequency remote unit interfaces are used for being connected with the radio frequency cables, and the cascade interfaces are used for being connected with the radio frequency remote unit interfaces of the lower active antennas through the radio frequency cables.

Optionally, in each of the cascaded rf cables and active antennas, a radio frequency receiving and transmitting gain between the remote radio unit interface and the cascaded interface of the active antenna is offset with a loss of the rf cable.

Optionally, the active part of the active antenna comprises an active circuit, a directional coupler and an antenna array, wherein an input port of the directional coupler is connected with the active circuit, a through port of the directional coupler is connected with the antenna array, and a coupling port of the directional coupler is connected with the cascade interface; wherein,

in the transmitting direction of the active antenna, a transmitting signal is amplified and filtered by the active circuit after being input by the radio frequency remote unit interface, the amplified and filtered transmitting signal enters the directional coupler through the input port, the directional coupler enters a part of the amplified and filtered transmitting signal into the antenna array from the through port and is transmitted by the antenna array, and the directional coupler outputs the other part of the amplified and filtered transmitting signal to the cascade interface from the coupling port to serve as the transmitting signal of the active antenna at the lower stage;

In the receiving direction of the active antenna, a received signal received through the antenna array enters the directional coupler from the through hole, a received signal of a lower active antenna input through the cascade interface enters the directional coupler through the coupling hole, the directional coupler combines two paths of received signals, enters the active circuit through the input hole, and the combined received signal enters the upper active antenna through the interface of the remote radio unit after amplified and filtered by the active circuit and finally is received by the remote radio unit.

Optionally, when the remote radio unit is a dual-polarized remote radio unit, the radio cable is a dual-channel radio cable, and the active antenna is a dual-polarized active antenna; wherein,

the radio frequency cable of one channel in the two-channel radio frequency cable is used for synchronously transmitting radio frequency signals and power supply to the dual-polarized active antenna, and the radio frequency cable of the other channel is used for synchronously transmitting radio frequency signals to the dual-polarized active antenna and receiving and transmitting switching signals.

Optionally, the dual polarized remote radio unit includes:

Two antenna interfaces with different polarizations are respectively used for transmitting radio frequency signals with respective polarizations;

one polarized antenna interface is also used for providing the power supply for the dual polarized active antenna, and the other polarized antenna interface is also used for providing the receiving and transmitting switching signal for the dual polarized active antenna; the power supply and the receiving and transmitting switching signals are fed into the antenna interfaces with corresponding polarization in the dual-polarized remote radio unit through low-pass elements.

Optionally, the dual polarized active antenna includes:

the power supply and the receiving and transmitting switching signals are separated from the radio frequency signals through low-pass elements in the dual-polarized remote radio unit respectively at the remote radio unit interface and are used for controlling power supply and antenna states;

and the power supply and the receiving and transmitting switching signals are respectively output by combining the low-pass element with the two paths of radio frequency signals at the cascading interface and are used by the subordinate dual-polarized active antenna.

Optionally, when the remote radio unit is a monopolar remote radio unit, the radio cable is a single-channel radio cable, and the active antenna is a monopolar active antenna; wherein,

the single-channel radio frequency cable is used for synchronously transmitting radio frequency signals, a power supply and a receiving and transmitting switching signal, wherein the receiving and transmitting switching signal is in a carrier modulation mode.

Optionally, the monopolar remote radio unit includes:

the single polarization antenna interface is used for transmitting a transmitting signal and a receiving signal, and is also used for providing a receiving-transmitting switching signal in the form of the power supply and the carrier modulation for the single polarization active antenna;

the power supply is fed into the monopole antenna interface through a low-pass element in the monopole remote radio unit, and the receiving and transmitting switching signal in the carrier modulation mode is fed into the monopole antenna interface through a band-pass filter with a first set frequency point in the monopole remote radio unit.

Optionally, the monopole active antenna includes:

the third radio frequency interface is used as the radio frequency remote unit interface, the power supply is separated from the radio frequency remote unit interface through a low-pass element and used for supplying power, the transceiver switching signal in the carrier modulation mode is separated, amplified and detected through a band-pass filter of a first set frequency point, and the detected transceiver switching signal is used for controlling the antenna state;

And the fourth radio frequency interface is used as the cascade interface, and at the cascade interface, the power supply and the receiving and transmitting switching signals in the carrier modulation form respectively pass through the low-pass element and the band-pass filter of the first set frequency point and then are combined with the radio frequency signals to be output for the next-stage monopole active antenna.

the single-channel radio frequency cable is used for synchronously transmitting radio frequency signals, a power supply and a receiving and transmitting switching signal, wherein the receiving and transmitting switching signal is a receiving and transmitting switching signal in a pulse wave mode.

Optionally, the monopolar remote radio unit includes:

the single polarization antenna interface is used for transmitting a transmitting signal and a receiving signal, and is also used for providing the power supply and the receiving and transmitting switching signals in the form of pulse waves for the single polarization active antenna;

the power supply is fed into the monopole antenna interface through a low-pass element in the monopole remote radio unit, and the receiving and transmitting switching signal in the form of pulse waves is fed into the monopole antenna interface through a band-pass filter with a second set frequency point in the monopole remote radio unit.

Optionally, the monopole active antenna includes:

a fifth radio frequency interface, wherein the fifth radio frequency interface is used as the radio frequency remote unit interface, at the radio frequency remote unit interface, the receiving and transmitting switching signal in the form of pulse wave is separated, amplified and decoded and recovered by a band-pass filter of a second set frequency point, and the receiving and transmitting switching signal after decoded and recovered is used for controlling the antenna state;

and the sixth radio frequency interface is used as the cascade interface, and at the cascade interface, the power supply and the receiving and transmitting switching signals in the form of pulse waves respectively pass through the low-pass element and the band-pass filter of the second set frequency point and then are combined with the radio frequency signals to be output for the next-stage monopole active antenna.

Optionally, when the remote radio unit is a monopolar remote radio unit, each of the cascaded active distributed antennas further includes a setting cable, where the setting cable is used for transmitting a power supply and receiving and transmitting a switching signal.

Optionally, each of the remote radio units is further provided with at least one set cable interface, and the set cable interface is used for being connected with the set cable to transmit the power supply and the transceiver switching signal.

Optionally, the active antenna is a monopole active antenna, and the monopole active antenna is further provided with at least one power supply and a transceiver switching control interface, where the power supply and the transceiver switching control interface are connected with the set cable interface through the set cable so as to transmit the power supply and the transceiver switching signal.

The indoor coverage system of wireless communication that this application provided, include: the system comprises an indoor baseband processing unit, at least one remote radio unit and at least one cascaded active distributed antenna; the indoor baseband processing unit is connected with each remote radio unit through an optical fiber; each remote radio unit is provided with at least one antenna interface which is used for being connected with the cascade active distributed antenna; each cascade active distributed antenna comprises a plurality of cascade radio frequency cables and active antennas, each active antenna is provided with a radio frequency remote unit interface and a cascade interface, the radio frequency remote unit interface is used for being connected with the radio frequency cables, and the cascade interface is used for being connected with the radio frequency remote unit interface of the lower active antenna through the radio frequency cables. The system has the advantages of low cost, good signal coverage, low power consumption, strong expandability and convenient installation.

It should be understood that the description of this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.

Drawings

The drawings are for better understanding of the present solution and do not constitute a limitation of the present application. Wherein:

FIG. 1 is a schematic diagram of a prior art cell site;

fig. 2 is a schematic diagram of a prior art pico base station;

FIG. 3 is a schematic diagram of a wireless communication indoor coverage system according to an embodiment of the present application;

fig. 4 is a schematic diagram of a dual polarized wireless communication indoor coverage system according to a first embodiment of the present application;

fig. 5 is a schematic block diagram of an active dual polarized antenna in TDD mode according to an embodiment of the present application;

fig. 6 is a schematic diagram of a remote radio unit according to a first embodiment of the present application;

fig. 7 is a schematic diagram of a cascaded dual polarized active antenna in FDD mode according to an embodiment of the present application;

fig. 8 is a schematic diagram of an active antenna that may be cascaded in FDD, TDD mixed mode according to a first embodiment of the present application;

fig. 9 is a schematic diagram of a single polarized wireless communication indoor coverage system according to second and third embodiments of the present application;

Fig. 10 is a schematic block diagram of a single polarization remote radio unit according to second and third embodiments of the present application;

fig. 11 is a schematic diagram of a monopole active antenna in TDD mode according to a second embodiment of the present application;

fig. 12 is a schematic diagram of a single-pole antenna communication indoor coverage system according to a fourth embodiment of the present application;

FIG. 13 is a functional block diagram of a four single polarization remote radio unit according to an embodiment of the present application;

fig. 14 is a schematic diagram of a four single polarized active antenna according to an embodiment of the present application.

Detailed Description

In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It is counted that 70% of mobile communication services occur indoors, so indoor coverage (or indoor distribution, indoor division) is an important part of mobile communication construction. However, the construction of the indoor coverage system for wireless communication has the problems of inconvenient construction and maintenance, poor signal coverage and large overall investment due to complex environment and a large number of partitions. Therefore, the method has important significance for both coverage and performance and reducing cost.

At present, coverage of indoor wireless communication signals is mainly realized through indoor division base stations, and the coverage is mainly realized through traditional indoor division base stations and pico base stations. The conventional indoor division base station is shown in fig. 1, the transmitting power of a signal source such as a BBU reaches more than hundred watts, and high-power low-insertion-loss radio frequency cables such as feeder lines, a large number of power dividers and couplers are required, so that the construction is complex. And because the insertion loss of the chamber distribution line is large, the power output by each node such as a passive antenna is smaller, and the uplink and downlink performance is poorer, namely the signal coverage is also poor.

While the Pico-cell output power is typically a few hundred milliwatts, the coverage distance is short, and one floor is covered by multiple Pico-cell remote radio units (Pico RRUs), as shown in fig. 2. This solution, although good in signal, large in capacity and relatively simple in engineering, is costly.

Therefore, the application provides a novel wireless communication indoor coverage system, which has the advantages of low cost, good signal coverage, low power consumption, strong expandability and convenient installation, and has important values for reducing the construction cost of an indoor communication network, reducing the power consumption and improving the signal coverage quality.

The wireless communication indoor coverage system provided by the present application is described in detail below with reference to the accompanying drawings.

Fig. 3 is a schematic diagram of a wireless communication indoor coverage system according to an embodiment of the present application.

As shown in fig. 3, a wireless communication indoor coverage system according to an embodiment of the present application includes: the system comprises an indoor baseband processing unit BBU, at least one remote radio unit RRU and at least one cascaded active distributed antenna.

The indoor baseband processing unit BBU is connected with each RRU through an optical fiber; each RRU is provided with at least one antenna interface, and the antenna interfaces are used for being connected with the cascade active distributed antennas; each cascaded active distributed antenna comprises a plurality of cascaded radio frequency cables and active antennas, each active antenna is provided with a remote radio unit interface (hereinafter referred to as RRU interface) and a cascade interface, the RRU interface is used for being connected with the radio frequency cables, and the cascade interface is used for being connected with the RRU interface of the lower active antenna through the radio frequency cables.

In this embodiment, the system consists of an indoor baseband processing unit BBU, at least one remote radio unit RRU and at least one cascaded active distributed antenna. The indoor baseband processing unit BBU is provided with a local antenna and at least one antenna interface for externally connecting the cascade active distributed antennas, the cascade active distributed antennas are formed by cascading a plurality of sections of radio frequency cables-active antennas, the active antennas are provided with an RRU interface for connecting the indoor baseband processing unit BBU and two interfaces for cascading the cascade interface, and a plurality of radio frequency cables-active antennas such as radio frequency cables-active antennas 1, radio frequency cables-active antennas 2 and … and the cascade connection of the radio frequency cables-active antennas N can be realized through the two interfaces, so that one active distributed antenna is formed, each active antenna becomes one node of the active distributed antennas, and power supply and receiving and transmitting switching signals of the active antennas are transmitted through the radio frequency cables or other cables.

In one embodiment of the present application, in each of the cascaded rf cable and the active antenna, the rf transceiver gain between the RRU interface and the cascaded interface of the active antenna is offset with the loss of the rf cable.

In this embodiment, the radio frequency receiving and transmitting gain between the RRU interface and the cascade interface of the active antennas exactly counteracts the loss of the radio frequency cable between the two active antennas, so that the cascade of the active antennas does not affect the gain of the uplink and downlink signals (the uplink signal is a receiving signal, and the downlink signal is a transmitting signal), and the uplink and downlink gains from the RRU to each node of the active distributed antennas are the same.

In one embodiment of the application, an active part of an active antenna comprises an active circuit, a directional coupler and an antenna array, wherein an input port of the directional coupler is connected with the active circuit, a through port of the directional coupler is connected with the antenna array, and a coupling port of the directional coupler is connected with a cascade interface; in the transmitting direction of the active antenna, a transmitting signal is amplified and filtered by an active circuit after being input by an RRU interface, the amplified and filtered transmitting signal enters a directional coupler through an input port, the directional coupler enables a part of the amplified and filtered transmitting signal to enter an antenna array from a through port and is transmitted by the antenna array, and the directional coupler outputs another part of the amplified and filtered transmitting signal to a cascade interface from a coupling port to serve as a transmitting signal of a lower active antenna; in the receiving direction of the active antenna, a receiving signal received through an antenna array enters a directional coupler from a straight-through port, a receiving signal of a lower active antenna input through a cascade interface enters the directional coupler from a coupling port, the directional coupler combines two paths of receiving signals and then enters an active circuit from an input port, and the combined receiving signal enters an upper active antenna through an RRU interface after being amplified and filtered by the active circuit and finally is received by a remote radio unit RRU.

In an embodiment of the present application, an active portion of an active antenna is connected to an antenna array and a cascade interface through a directional coupler, and a through port of the directional coupler is connected to the antenna array, a coupling port of the active antenna is connected to the cascade interface, and a signal path in the active antenna is: in the transmitting direction, transmitting signals are input by an RRU interface, amplified and filtered by an active circuit and then enter a directional coupler, wherein most of the signals enter an antenna array from a straight-through port and are transmitted, and a small part of the signals are output to a cascade interface from a coupling port and are used as transmitting signals of an active antenna at a lower stage; in the receiving direction, the receiving signals of the antenna array of the current stage enter the directional coupler from the straight-through port, meanwhile, the receiving signals of the active antenna of the lower stage input by the cascade interface enter the directional coupler from the coupling port, and the receiving signals are jointly amplified and filtered through the active ports, then output to the RRU interface of the antenna, enter the active antenna of the upper stage, and finally are received by the RRU.

The indoor coverage system for wireless communication in this embodiment of the present application supports dual polarization and also supports single polarization, and the indoor coverage system for wireless communication in this application may also be in TDD (Time Division Duplexing, time division duplex) mode, or in FDD (Frequency Division Duplexing, frequency division duplex) mode, or in both TDD and FDD modes, which are described below in connection with different embodiments.

Example 1

Fig. 4 is a schematic diagram of a dual polarized wireless communication indoor coverage system according to one embodiment of the present application.

Fig. 5 is a functional block diagram of an active dual polarized antenna according to one embodiment of the present application.

As shown in fig. 4, when the remote radio unit RRU is a dual-polarized remote radio unit RRU, the radio cable is a dual-channel radio cable, and the active antenna is a dual-polarized active antenna; the radio frequency cable of one channel of the two-channel radio frequency cables is used for synchronously transmitting radio frequency signals and power supplies to the dual-polarized active antenna, and the radio frequency cable of the other channel is used for synchronously transmitting radio frequency signals to the dual-polarized active antenna and receiving and transmitting switching signals.

As shown in fig. 4, the dual polarized remote radio unit RRU includes: two antenna interfaces with different polarizations are respectively used for transmitting radio frequency signals with respective polarizations; one polarized antenna interface is also used for providing power supply for the dual polarized active antenna, and the other polarized antenna interface is also used for providing receiving and transmitting switching signals for the dual polarized active antenna; the power supply and the receiving and transmitting switching signals are fed into the antenna interfaces with corresponding polarization in the dual-polarization remote radio unit RRU through the low-pass element. Wherein the low pass element includes, but is not limited to, an inductor, a low pass filter, and a quarter-wave microstrip line.

As shown in fig. 5, each dual polarized active antenna includes: two first radio frequency interfaces and two second radio frequency interfaces. Each first radio frequency interface is used as an RRU interface (1), and at the RRU interface (1), a power supply and a receiving and transmitting switching signal are separated from radio frequency signals through a low-pass element (3) in a dual-polarized remote radio unit RRU respectively and are used for controlling power supply and antenna states; each second radio frequency interface is used as a cascade interface (2), and at the cascade interface (2), a power supply and a receiving and transmitting switching signal are respectively output by combining with two paths of radio frequency signals through a low-pass element (3) for use by a subordinate dual-polarized active antenna.

It will be appreciated that a so-called dual polarized antenna is actually a combination of 2 antennas, which are arranged at different angles, e.g. 90 degrees, and that the polarization directions of the transmitted electromagnetic wave signals are also perpendicular to each other. For a split antenna, the 2 antennas for dual polarization are typically one horizontally polarized and one vertically polarized.

The following is described with reference to fig. 4:

the system of the application is provided with two distributed antennas, each distributed antenna is formed by cascading a dual-channel radio frequency cable-dual-polarized active antenna, and the two distributed antennas respectively cover the east-west two aisles of the floor. For example, one of the two-channel radio-frequency cables is formed by cascading the two-channel radio-frequency cables, namely the active antenna 1_1, the two-channel radio-frequency cable, namely the active antenna 1_2, the …, the two-channel radio-frequency cable, namely the active antenna 1_N, and the other one of the two-channel radio-frequency cables is formed by cascading the two-channel radio-frequency cables, namely the active antenna 2_1, the two-channel radio-frequency cable, namely the active antenna 2_2, the …, the two-channel radio-frequency cable, namely the active antenna 2_M, in sequence, namely the first distributed antenna is cascaded with N antenna nodes, the second distributed antenna is cascaded with M antenna nodes, and the number of the nodes and the coverage distance are flexibly determined. The spacing between nodes may be fixed at 15 meters, with each node rated for 15dBm. The signal coverage is the same regardless of which node the user walks to. Each active antenna node is respectively powered and controlled by the remote radio unit RRU through 2 radio cables.

The following is described in conjunction with fig. 5:

A. the active antennas are dual-polarized active antennas, each polarized active antenna is provided with two external radio frequency interfaces, namely a first radio frequency interface and a second radio frequency interface, one of the first radio frequency interface and the second radio frequency interface is an RRU interface (1), and the other is a cascade interface (2) which is respectively used for connecting a remote radio unit RRU and a cascade. If cascading is not required, the cascading interface (2) is not left unused.

B. The active part of the dual-polarized active antenna comprises a radio frequency switch (5), an attenuator (6) for adjusting gain, a power amplifier (7), a low noise amplifier (8), a filter (9) and a dual-polarized antenna array (11).

C. The power supply (12) or the TDD type receiving and transmitting switching signal (13) is separated from the inside of the dual-polarized active antenna through the low-pass element (3) and is respectively used for the working power supply and the state control of the antenna. In this example, the low-pass element (3) may in particular be an inductance. The power supply and the receiving and transmitting switching signals are blocked by the capacitor (4) and cannot enter the active circuit of the active part, but can be separated through the inductor and used for supplying power to the active circuit or controlling the state of the active circuit. At the cascade interface (2), the power supply and the transmit-receive switching signal are fed through a low-pass element (3), such as an inductor, to the subordinate dual-polarized active antenna.

D. The dual polarized active antennas couple the radio frequency signals of the upper dual polarized active antennas to the lower dual polarized active antennas through directional couplers (10). In the transmitting direction, after the transmitting signals are amplified and filtered, most of the transmitting signals are fed to an antenna array (11) through a straight port, and the transmitting signals are output to a cascade interface (2) through a coupling port to serve as transmitting signals of an active antenna at a lower stage; in the receiving direction, the receiving signals of the dual-polarized active antenna of the current stage enter the straight-through port of the directional coupler (10), the receiving signals of the dual-polarized active antenna of the upper stage input by the cascade interface enter the coupling port, then enter the active circuit of the current stage together, are output by the RRU interface (1) of the dual-polarized active antenna, and finally are received by the RRU.

E. In order to avoid the influence of cascade stages on uplink and downlink gains of receiving and transmitting switching signals, the radio frequency gain between the RRU interface (1) and the cascade interface (2) ports of the dual-polarized active antennas exactly counteracts the loss of a radio frequency cable between the two dual-polarized active antennas. Because the antenna is a dual-polarized active antenna, a low-cost cable can be used for the radio frequency cable, and the loss of each section of the radio frequency cable with 15 meters is 20dB, so that the radio frequency gain between the ports of the RRU interface (1) and the cascade interface (2) of the dual-polarized active antenna is adjusted to 20dB. If the coupling degree of the directional coupler (10) is designed to be-18 dB, the gain from the RRU interface (1) to the antenna array (11) is 20+18=38dB, and the radio frequency gain from the antenna interface of the RRU to each antenna array is 18dB. When the antenna interface transmitting power of the RRU is-3 dBm, the transmitting power of each antenna node is 15dBm.

F. Since each dual polarized active antenna can only cover a very small range, the transmitting power can be very small (for example, can be 15 dBm), so that high-cost devices such as a high-efficiency high-power amplifier, a circulator, predistortion treatment and the like are not needed, and the cost of the whole system is greatly reduced.

The remote radio unit RRU in this case is shown in fig. 6. The following is described in connection with fig. 6:

I. the remote radio unit RRU has two pairs of dual polarized antenna interfaces for the two distributed active dual polarized antennas of fig. 4, respectively. For example, one of the two-channel radio-frequency cables is formed by cascading the two-channel radio-frequency cables, namely the active antenna 1_1, the two-channel radio-frequency cable, namely the active antenna 1_2, the …, the two-channel radio-frequency cable, namely the active antenna 1_N, and the other one of the two-channel radio-frequency cables is formed by cascading the two-channel radio-frequency cable, namely the active antenna 2_1, the two-channel radio-frequency cable, namely the active antennas 2_2, the …, and the two-channel radio-frequency cable, namely the active antenna 2_M.

And II, the functions inside the antenna interface are similar to those of an active antenna, and the transmission paths of the transmitting signals and the receiving signals of the RRU are also similar to those of the active antenna.

In this embodiment, the local antenna in the RRU is used for signal coverage in the near vicinity, and the transmission power is also 15dBm.

And the remote radio unit RRU respectively provides a power supply (12) and a receiving and transmitting switching signal (13) for the active antenna through the low-pass element (3), for example, a local antenna in the remote radio unit RRU can be a dual-polarized antenna (such as the right side) or a single-polarized antenna (such as the left side).

And V, high-cost devices such as a high-efficiency high-power amplifier, a circulator, predistortion and the like are not used in the RRU due to low transmitting power, so that the cost of the system is reduced.

In the case of a cascadable dual polarized active distributed antenna for FDD, the low pass element (3) of one of the polarization channels may be omitted, only one of the polarization channels is required to provide the power supply (12), and as shown in fig. 7, the two low pass elements (3) are omitted compared to the local antenna of fig. 6. Also, to accommodate FDD applications, the switch (13) and filter (9) in fig. 6 are replaced by a diplexer (14), as shown in fig. 7.

Fig. 8 is a schematic diagram of a cascadable active antenna with both FDD and TDD according to a first embodiment of the present application. The antenna structure of fig. 4 and 6 is combined with fig. 8, except that the filter (9) is replaced by a triplexer (15). The RRU corresponding to the RRU is also in a mixed mode of FDD and TDD.

It should be noted that, the transceiver in the embodiment is a communication device that concentrates both receiving and transmitting portions on one chassis or frame, and the transceiver has a smaller transmitting power, so that the transceiver is suitable for a mobile station. The digital intermediate frequency mainly comprises two parts, digital up-conversion and digital down-conversion.

Example two

Fig. 9 is a schematic diagram of a wireless communication indoor coverage system according to a second embodiment of the present application.

Fig. 10 is a schematic block diagram of a remote radio unit RRU according to a second embodiment of the present application.

Fig. 11 is a functional block diagram of a single polarized active antenna according to a second embodiment of the present application.

As shown in fig. 9, when the remote radio unit RRU is a monopolar remote radio unit RRU, the radio cable is a single-channel radio cable, and the active antenna is a monopolar active antenna; the single-channel radio frequency cable is used for synchronously transmitting radio frequency signals, a power supply and a receiving and transmitting switching signal, wherein the receiving and transmitting switching signal is in a carrier modulation mode.

As shown in fig. 10, the monopolar remote radio unit RRU includes: the single polarization antenna interface (51), the single polarization antenna interface (51) is used for transmitting the transmitting signal and receiving the signal, also is used for providing the power and receiving and transmitting switching signals in the form of carrier modulation for the single polarization active antenna; the power supply is fed into the monopole antenna interface (51) through a low-pass element in the monopole remote radio unit RRU, and the receiving and transmitting switching signal in the carrier modulation form is fed into the monopole antenna interface (51) through a band-pass filter (17) with a first set frequency point in the monopole remote radio unit RRU. Wherein, the band-pass filter (17) of the first set frequency point can be a low-frequency band filter (17). Each polarized active antenna has two external radio frequency interfaces,

As shown in fig. 11, the monopole active antenna has two external radio frequency interfaces, and the two external radio frequency interfaces include: a third RF interface and a fourth RF pull interface. The third radio frequency interface is used as an RRU interface (1), a power supply is separated at the RRU interface (1) through a low-pass element (3) for supplying power, a receiving and transmitting switching signal in a carrier modulation form is separated, amplified and detected through a band-pass filter (17) of a first set frequency point, and the detected receiving and transmitting switching signal is used for controlling the state of an antenna; the fourth radio frequency interface is used as a cascade interface (2), and at the cascade interface (2), the power supply and the receiving and transmitting switching signals in the carrier modulation form are respectively output by combining with radio frequency signals after passing through the low-pass element (3) and the band-pass filter (17) of the first set frequency point, so as to be used by the lower-stage single-polarization active antenna.

The difference between fig. 9 and fig. 4 of the first embodiment is that the active antenna is a monopole active antenna, and each antenna node is cascaded by a radio frequency cable, and uplink and downlink signals, a power supply and a TDD transceiver switching signal in a carrier modulation mode are simultaneously transmitted inside the radio frequency cable.

Fig. 10 differs from the remote radio unit RRU of fig. 5 in that: the number of channels is reduced by half due to the single polarization; the antenna interface (51) transmits the uplink and downlink signals, the power supply and the transmission/reception switching signal (16) in the form of a carrier wave. In the second embodiment, the carrier frequency for transmitting the transmission/reception switching signal is a 10MHz sine wave, and is generated by a crystal oscillator (18). The carrier signal is modulated by a transmit-receive switching signal (13) via a switch (19) to form a transmit-receive switching signal (16) in the form of a carrier, which is fed via a low-frequency band-pass filter (17) to the antenna interface. The function of the low-frequency band-pass filter (17) is to allow the transmission/reception switching signal (16) in the form of a carrier wave to pass therethrough while preventing other signals from leaking to the modulation circuit.

Fig. 11 is different from the dual polarized antenna of fig. 4 in that: since the antenna is a monopole active antenna, the number of channels is reduced by half; the RRU interface (1) simultaneously transmits a transmitting signal, a receiving signal, a power supply and a receiving and transmitting switching signal (16) in the form of a carrier wave; at an RRU interface (1) of the antenna, a receiving and transmitting switching signal (16) in a carrier form is separated through a 10MHz band-pass filter (17), and then the receiving and transmitting switching signal (13) is obtained through an amplifier and a detector (20); a transmission/reception switching signal (16) in the form of a carrier wave is combined with a cascade interface (2) of an antenna through a low-frequency band-pass filter (17).

Example III

Fig. 9 is a schematic diagram of a wireless communication indoor coverage system according to a third embodiment of the present application.

Fig. 10 is a schematic block diagram of a remote radio unit RRU according to a third embodiment of the present application.

As shown in fig. 9, when the remote radio unit RRU is a monopolar remote radio unit RRU, the radio cable is a single-channel radio cable, and the active antenna is a monopolar active antenna; the single-channel radio frequency cable is used for synchronously transmitting radio frequency signals, a power supply and a receiving and transmitting switching signal, wherein the receiving and transmitting switching signal is a receiving and transmitting switching signal in a pulse wave mode.

As shown in fig. 10, the monopolar remote radio unit RRU includes: the single polarization antenna interface (51), the single polarization antenna interface (51) is used for transmitting the transmitting signal and receiving the signal, also is used for providing the power and the receiving and transmitting switching signal in the form of pulse wave for the single polarization active antenna; the power supply is fed into the monopole antenna interface (51) through a low-pass element in the monopole remote radio unit RRU, and the receiving and transmitting switching signal in the form of pulse wave is fed into the monopole antenna interface (51) through a band-pass filter (17) with a second set frequency point in the monopole remote radio unit RRU. The band-pass filter of the second set frequency point may be set as required, and is not particularly limited herein.

Optionally, the monopole active antenna has two external radio frequency interfaces, and the two external radio frequency interfaces include: a fifth radio frequency interface and a sixth radio frequency interface, wherein the fifth radio frequency interface is used as an RRU interface, at the RRU interface, the receiving and transmitting switching signal in the form of pulse wave is separated, amplified and decoded and recovered by a band-pass filter of a second set frequency point, and the decoded and recovered receiving and transmitting switching signal is used for controlling the state of an antenna; the sixth radio frequency interface is used as a cascade interface, and at the cascade interface, the power supply and the receiving and transmitting switching signals in the form of pulse waves are respectively output by combining with radio frequency signals after passing through the low-pass element and the band-pass filter of the second set frequency point, so that the signal is used by the lower-stage single-polarization active antenna.

It should be noted that, when implementing the third embodiment, the band-pass filter of the first set frequency point with the detection function in the monopole active antenna in fig. 12 of the second embodiment may be replaced by the band-pass filter of the second set frequency point with the decoding recovery function or other components, and the implementation manner of the third embodiment may be referred to the second embodiment, which is not repeated here.

Example IV

Fig. 12 is a schematic diagram of a single polarized wireless communication indoor coverage system according to a fourth embodiment of the present application.

Fig. 13 is a functional block diagram of a remote radio unit RRU in the system of fig. 12.

Fig. 14 is a schematic diagram of a single polarized active antenna in the system of fig. 12.

As shown in fig. 12, when the remote radio unit RRU is a single-polarized remote radio unit RRU, each cascaded active distributed antenna further includes a setting cable, where the setting cable is used for transmitting power and receiving/transmitting switching signals.

As shown in fig. 13, each remote radio unit RRU is further provided with at least one set cable interface (21), and the set cable interface (21) is used for connecting with a set cable to transmit power and transmit/receive switching signals.

Optionally, the active antenna is a monopole active antenna, and the monopole active antenna is further provided with at least one power supply and transceiver switching control interface (22), and the power supply and transceiver switching control interface (22) is used for being connected with the set cable interface (21) through a set cable so as to transmit power supply and transceiver switching signals.

The following is described with reference to fig. 12:

each active antenna node is connected with a radio frequency cable in a cascading way, and a set cable such as a network cable is used for providing power supply and receiving and transmitting switching signals and is used for transmitting only transmitting signals and receiving signals inside the cascading radio frequency cable. The system design is simpler than the first, second and third embodiments, but increases the complexity of the engineering installation.

The following is described with reference to fig. 13:

the remote radio unit RRU provides a power supply and transmit-receive control interface (21), and in this embodiment, a network port may be used, so that multiple wires in the network cable may be used to output the power supply (12) and transmit-receive switching signals (13) respectively. Although the internal simplification of the remote radio unit RRU of the fourth embodiment is not small, a set cable interface (21) dedicated to transmitting power and receiving signals is added.

The antenna of fig. 14 is free of the low pass element (3), the low pass bandwidth filter (17) and the corresponding detection circuit compared to the antenna of fig. 11 due to the dedicated power supply and transmit-receive control interface (22), but the engineering installation becomes complicated due to the multiple interfaces.

It should be noted that, the indoor coverage system for wireless communication in the embodiment of the present application may be a single band or multiple bands, and the application is not limited.

In summary, the indoor coverage system for wireless communication provided in the embodiment of the present application includes: the system comprises an indoor baseband processing unit, at least one remote radio unit and at least one cascaded active distributed antenna; the indoor baseband processing unit is connected with each remote radio unit through an optical fiber; each remote radio unit is provided with at least one antenna interface which is used for being connected with the cascade active distributed antenna; each cascade active distributed antenna comprises a plurality of cascade radio frequency cables and active antennas, each active antenna is provided with a radio frequency remote unit interface and a cascade interface, the radio frequency remote unit interface is used for being connected with the radio frequency cables, and the cascade interface is used for being connected with the radio frequency remote unit interface of the lower active antenna through the radio frequency cables. The system has the advantages of low cost, good signal coverage, low power consumption, strong expandability and convenient installation, and has important values for reducing the construction cost of an indoor communication network, reducing the power consumption and improving the signal coverage quality.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A wireless communication indoor coverage system, comprising: the system comprises an indoor baseband processing unit, at least one remote radio unit and at least one cascaded active distributed antenna; wherein,

2. The system of claim 1, wherein in each of the serially cascaded rf cables and active antennas, rf transceiver gain between the remote radio unit interface and the cascaded interface of the active antenna is offset by loss of the rf cable.

3. The system of claim 1, wherein the active portion of the active antenna comprises an active circuit, a directional coupler, and an antenna array, an input port of the directional coupler being connected to the active circuit, a pass-through port of the directional coupler being connected to the antenna array, a coupling port of the directional coupler being connected to the cascade interface; wherein,

4. The system of claim 1, wherein when the remote radio unit is a dual polarized remote radio unit, the radio cable is a dual channel radio cable, and the active antenna is a dual polarized active antenna; wherein,

5. The system of claim 4, wherein the dual polarized remote radio unit comprises:

6. The system of claim 4, wherein the dual polarized active antenna comprises:

7. The system of claim 1, wherein when the remote radio unit is a monopolar remote radio unit, the radio cable is a single channel radio cable and the active antenna is a monopolar active antenna; wherein,

8. The system of claim 7, wherein the monopolar remote radio unit comprises:

9. The system of claim 7, wherein the single polarized active antenna comprises:

The third radio frequency interface is used as the radio frequency remote unit interface, the power supply is separated from the radio frequency remote unit interface through a low-pass element and used for supplying power, the receiving and transmitting switching signals in the carrier modulation form are separated, amplified and detected through a band-pass filter of a first set frequency point, and the detected receiving and transmitting switching signals are used for controlling the antenna state;

10. The system of claim 1, wherein when the remote radio unit is a monopolar remote radio unit, the radio cable is a single channel radio cable and the active antenna is a monopolar active antenna; wherein,

11. The system of claim 10, wherein the monopolar remote radio unit comprises:

12. The system of claim 10, wherein the single polarized active antenna comprises:

13. The system of claim 1, wherein when the remote units are monopolar remote units, each of the cascaded active distributed antennas further comprises a set cable for transmitting power and receiving and transmitting switching signals.

14. The system of claim 13, wherein the system further comprises a controller configured to control the controller,

each single-pole remote radio unit is further provided with at least one set cable interface, and the set cable interface is used for being connected with the set cable so as to transmit the power supply and the receiving and transmitting switching signals.

15. The system of claim 14, wherein the active antenna is a monopole active antenna, the monopole active antenna further having at least one power and transmit/receive switching control interface for interfacing with the set cable through the set cable to transmit the power and transmit/receive switching signals.