WO2021109203A1 - 5g signal radio frequency distribution system - Google Patents

Abstract

Disclosed is a 5G signal radio frequency distribution system, comprising: an access unit, used for receiving and amplifying a signal of a base station or space; an expansion unit, used for dividing the input signal of the access unit into multiple channels, and sending to a plurality of coverage units; the plurality of coverage units are used for amplifying the received signal, then performing signal coverage by means of a coverage antenna; said access unit is connected to the expansion unit by means of a radio frequency coaxial cable, and the expansion unit is connected to the plurality of coverage units by means of a radio frequency coaxial cable. The present invention uses radio frequency coaxial cable as a transmission medium, supporting multi-point source access and multi-point signal coverage, while also adopting an innovative TDD synchronization control signal transmission and restoration scheme, significantly reducing the complexity and cost of the coverage unit, enabling it to solve the 5G network coverage requirements and subsequent low-cost operation and maintenance requirements at a relatively low cost.

Description

A 5G signal radio frequency distribution system Technical field

The present invention relates to the field of mobile communication technology, and more specifically, to a 5G signal radio frequency distribution system.

Background technique

With the development of mobile communication network technology and the construction of communication infrastructure, the coverage of mobile communication networks has become deeper and deeper, and the application requirements for mobile phones and other mobile terminals have also exploded. User needs have increased from the initial outdoor application to indoor full-scene mobile Access requirements.

At present, the indoor coverage and distribution of 4G network signals are mainly divided into two categories: passive distribution and active distribution. Passive distribution refers to the indoor use of high-power BBU and repeater as the signal source, the use of passive components such as coaxial cable and power splitter combiner as the signal transmission medium, and then the signal is transmitted through the antenna to realize the wireless signal cover. Active distribution refers to the use of active equipment to perform radio frequency splitting and radio frequency remote amplification in the room, and then achieve wireless signal coverage through a covering antenna. The advantages of passive distribution are low cost, simple implementation and high reliability. The advantages of active distribution are wide coverage, good scalability and good coverage.

With the upgrading of communication technology and networks, the 5G era has arrived. Compared with 2G/3G/4G mobile communication, 5G mobile communication has higher frequency and higher coverage requirements. The current passive distribution scheme is due to coaxial cables, such as As shown in Figure 1, the frequency band support capabilities of power splitters and combiners are limited and cannot smoothly support higher frequency services. In addition, as the frequency increases, the loss of radio frequency transmission will increase significantly, and the conventional passive distribution supports the transmission range With great discounts, it has been difficult to meet the needs of most business scenarios. Therefore, in the 5G stage, the mainstream indoor coverage solution in the industry has turned to an active distributed system.

technical problem

In the active distribution system, the current mainstream implementation scheme is the digital optical fiber distribution system, as shown in Figure 2. It is mainly composed of access units, expansion units and coverage units. Each unit is connected by optical fiber to transmit 5G. Signal, the 5G optical fiber distribution system has greatly improved the transmission signal bandwidth and channel number compared with 4G, so the system supports the transmission bandwidth. Transmission rate, equipment complexity and cost, and power consumption have all increased significantly. When faced with high-capacity coverage scenarios, this solution is indeed a better solution, but it is oriented to areas and scenarios where capacity requirements and service value-added are not significant. , The overall cost and operation and maintenance costs are still relatively expensive.

In view of the different scenarios and business requirements of 5G signal indoor distribution and coverage, in terms of input and output, the price of digital optical fiber distribution system and higher expenses such as the electricity bill for later operation make it unsuitable as the only indoor coverage solution. According to different needs, it should be combined with some cost-effective solutions to meet the signal coverage requirements of operators in different services and scenarios.

Technical solutions

The purpose of the present invention is to provide a 5G signal radio frequency distribution system, which can solve the coverage requirements of the 5G network and the later low-cost operation and maintenance requirements at a relatively low cost.

In order to achieve the above objectives, the technical solutions adopted by the present invention are as follows:

A 5G signal radio frequency distribution system, including:

The access unit is used to receive and amplify the signal of the base station or space;

Expansion unit, used to divide the signal input from the access unit into multiple channels and send them to multiple coverage units;

Multiple coverage units are used to amplify the received signal and then perform signal coverage through the coverage antenna;

The access unit is connected to the expansion unit through a radio frequency coaxial cable, and the expansion unit is connected to a plurality of covering units through a radio frequency coaxial cable.

Further, the expansion unit includes a 5G synchronization module, a power supply control switch, a power supply, and a power divider, the 5G synchronization module is connected to the power supply control switch and the power divider, and the power supply control switch is connected to the power supply and the power divider, The power divider is connected to the coverage unit, and the 5G synchronization module is used to generate a TDD uplink and downlink switching timing control signal. The timing control signal converts the direct current supplied to the coverage unit into a direct current carrying the uplink and downlink timing characteristics through the power supply control switch. Square wave.

Further, the power supply control switch is a MOS tube, the gate of the MOS tube is connected to the control end of the 5G synchronization module, and the drain of the MOS tube is connected to the power source.

Further, the cover unit includes a radio frequency amplifying module, a DC rectifier circuit, and a comparator. The input end of the radio frequency amplifying module, the input end of the DC rectifier circuit, and the input end of the comparator are all connected to the power divider. The output terminal of the rectifier circuit is connected with the power supply terminal of the radio frequency amplification module, and the output terminal of the comparator is connected with the control terminal of the radio frequency amplification module.

Further, the DC rectifier circuit includes a rectifier diode and a filter capacitor, the anode of the rectifier diode inputs a DC pulse, the cathode of the rectifier diode outputs the rectified power and is grounded through the filter capacitor, the anode of the input terminal of the comparator inputs a DC pulse, and the output terminal Connect to the control end of the RF amplifier module.

Further, the expansion unit and the multiple coverage units are connected in a star shape.

Beneficial effect

Compared with the prior art, the advantages of the present invention are: the present invention adopts radio frequency coaxial cable as the transmission medium, supports multi-point source access and multi-point signal coverage, and adopts an innovative TDD synchronization control signal transmission and restoration scheme. , Which greatly reduces the complexity and cost of the coverage unit, so that it can solve the coverage requirements of the 5G network and the later low-cost operation and maintenance requirements at a relatively low cost.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 is a schematic diagram of passive distribution in the prior art.

Figure 2 is a schematic diagram of digital optical fiber distribution in the prior art

Fig. 3 is a schematic diagram of the radio frequency distribution of the 5G signal radio frequency distribution system of the present invention.

Figure 4 is a schematic diagram of the expansion unit in the present invention.

Fig. 5 is a schematic diagram of the covering unit in the present invention.

Fig. 6 is a schematic diagram of the power supply control switch in the expansion unit of the present invention.

Fig. 7 is a schematic diagram of the DC rectifier and the comparator restoration signal in the covering unit of the present invention.

Embodiments of the present invention

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so that the protection scope of the present invention can be defined more clearly.

Referring to Figure 3, the present invention provides a 5G signal radio frequency distribution system, including: an access unit for receiving and amplifying signals from a base station or space; an extension unit for dividing the input signal from the access unit into multiple channels , And send to multiple coverage units; multiple coverage units are used to amplify the received signals and then perform signal coverage through the coverage antenna; the access unit is connected to the extension unit through a radio frequency coaxial cable, and the extension unit It is connected to multiple covering units through radio frequency coaxial cables.

In this embodiment, the access unit is used to receive wireless signals or radio frequency signals coupled by a base station, and the access unit supports single channel or multi-channel (MIMO).

In this embodiment, the extension unit supports access of multiple access units to support the synthesis and distribution of multiple sources, and the extension unit supports star connection of multiple coverage units.

In this embodiment, the expansion unit can be cascaded with multi-level expansion units through a radio frequency expansion port.

In this embodiment, the external power supply of the system is connected to the expansion unit and remotely powers the access unit and the covering unit through a radio frequency coaxial cable.

Referring to Figure 4, the expansion unit includes a 5G synchronization module, a power supply control switch, a power supply, and a power divider. The 5G synchronization module is connected to the power supply control switch and the power divider. The power supply control switch is connected to the power supply and power divider. The splitter is connected, and the power splitter is connected with the covering unit.

Referring to Figure 5, the covering unit includes a radio frequency amplifier module, a DC rectifier circuit and a comparator. The input end of the radio frequency amplifier module, the input end of the DC rectifier circuit and the input end of the comparator are all connected to the power divider, and the DC rectifier The output terminal of the circuit is connected with the power supply terminal of the radio frequency amplification module, and the output terminal of the comparator is connected with the control terminal of the radio frequency amplification module.

The 5G synchronization module is used to generate TDD uplink and downlink switching timing control signals. The timing control signal converts the direct current supplied to the coverage unit into a DC square wave carrying the uplink and downlink timing characteristics through the power supply control switch, and the coverage unit will receive The DC square wave is divided into two channels. One channel enters the comparator of the coverage unit and returns to the TDD uplink and downlink timing control signal to control the operation of the RF amplifier module. The other channel supplies power to the RF amplifier module through the DC rectifier circuit of the coverage unit.

Referring to Figure 6, the power supply control switch is a MOS tube, the gate of the MOS tube is connected to the control terminal of the 5G synchronization module, and the drain of the MOS tube is connected to the power supply. The power supply control switch can also be implemented by other options. The switch of the function.

In this embodiment, the 5G synchronization module, power supply, and power splitter can be implemented by selecting solutions in the prior art.

Referring to Figure 7, the DC rectifier circuit includes a rectifier diode and a filter capacitor. The anode of the rectifier diode inputs a DC pulse, the cathode of the rectifier diode outputs the rectified power and is grounded through the filter capacitor, and the positive input of the comparator inputs DC pulses. Pulse, the output terminal is connected to the control terminal of the radio frequency amplifier module.

The present invention will be further introduced through specific embodiments below.

Take China Telecom 5G as an example, the frequency band used by China Telecom 5G is 3400MHz-3500MHz, the bandwidth is 100MHz, the source is 5G small base station, and the radio frequency distribution system is 1 access unit, 1 extension unit and 4 coverage units. 5G The small base station is connected to the access unit through one radio frequency cable, the access unit is connected to the expansion unit through one radio frequency cable, and the expansion unit is connected to the four coverage units through four radio frequency cables.

5G uplink and downlink signal trend: 5G downlink signals are transmitted from the radio frequency output port of the small base station, and enter the access unit through the radio frequency cable. The access unit amplifies the signal and sends it to the expansion unit. The expansion unit couples to the synchronization module and sends the signal at the same time. The power is divided into 4 channels, and the 4 channels of signals are transmitted to the cover unit through the radio frequency cable. After the cover unit receives the signal, it is output from the antenna port to the cover antenna through amplification, and the cover antenna performs signal coverage.

The 5G uplink signal is received by the coverage antenna and enters the antenna port of the coverage unit. After being amplified, it will reach the expansion unit through the radio frequency cable. The expansion unit combines the uplink signals of the 4 coverage units and transmits them to the access unit via the radio frequency cable. The access unit sends the signal to the radio frequency output port of the small base station through the radio frequency cable, and returns to the small base station.

5G uplink and downlink switching timing control signal trend: the downlink signal is coupled all the way to the 5G air interface synchronization module by the expansion unit, and the synchronization module generates the uplink and downlink switching timing control signal. This control signal controls the control switch of the DC remote supply path to make the expansion unit output The direct current to the cover unit is changed into a square wave pulse form. The power supply control switch uses a metal-oxide semiconductor field effect transistor (MOS-FET) to realize the on and off control of the power supply. The G pole of the field effect tube is connected to the synchronization module. The S pole is connected to the positive pole of the power supply, and the D pole is connected to the output terminal of the power supply, and feeds into the radio frequency link through the inductor.

The coverage unit receives the DC pulse transmitted by the expansion unit, divides the pulse into two paths, and outputs the pulse to the coverage unit through the DC rectifier circuit as a power source, so that the RF amplifier module can operate normally. The rectifier circuit is generally a path diode and It consists of a filter capacitor connected to ground. The other way enters the comparator. The comparator generally uses an analog operational amplifier as a judge, and compares it with the set V_Ref reference voltage as a reference, and restores it to a control signal. The control signal is used to realize the timing of the uplink and downlink of the coverage unit. Switch.

Although the embodiments of the present invention are described in conjunction with the accompanying drawings, the patent owner can make various deformations or modifications within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention. Within the protection scope of the present invention.

Claims (6)

1. A 5G signal radio frequency distribution system, which is characterized by comprising: an access unit for receiving and amplifying signals from a base station or space; an extension unit for dividing the signal input by the access unit into multiple channels and sending them to multiple channels. Covering units; multiple covering units, used to amplify the received signal, and then cover the signal through the cover antenna; the access unit is connected to the extension unit through a radio frequency coaxial cable, and the extension unit is through a radio frequency coaxial cable Connect with multiple covering units.
2. The 5G signal radio frequency distribution system according to claim 1, wherein the expansion unit includes a 5G synchronization module, a power supply control switch, a power supply, and a power divider, and the 5G synchronization module is connected to the power supply control switch and the power divider. , The power supply control switch is connected to the power supply and the power divider, the power divider is connected to the cover unit, and the 5G synchronization module is used to generate the TDD uplink and downlink switching timing control signal. The timing control signal is connected to the power supply control switch. The direct current supplied to the covering unit is transformed into a direct current square wave carrying the characteristics of the uplink and downlink time series.
3. The 5G signal radio frequency distribution system according to claim 2, wherein the power supply control switch is a MOS tube, the gate of the MOS tube is connected to the control terminal of the 5G synchronization module, and the drain of the MOS tube is connected to the power supply .
4. The 5G signal radio frequency distribution system according to claim 2, wherein the covering unit includes a radio frequency amplifying module, a DC rectifier circuit, and a comparator, an input terminal of the radio frequency amplifying module, an input terminal of the DC rectifier circuit, and a comparator The input ends of the converters are all connected to the power divider, the output end of the DC rectifier circuit is connected to the power supply end of the radio frequency amplifying module, and the output end of the comparator is connected to the control end of the radio frequency amplifying module.
5. The 5G signal radio frequency distribution system according to claim 4, wherein the DC rectifier circuit comprises a rectifier diode and a filter capacitor, the anode of the rectifier diode inputs a DC pulse, and the cathode of the rectifier diode outputs the rectified power and is grounded through the filter capacitor, The positive pole of the input terminal of the comparator inputs a DC pulse, and the output terminal is connected to the control terminal of the radio frequency amplifier module.
6. The 5G signal radio frequency distribution system according to claim 1, wherein the expansion unit and the multiple coverage units are connected in a star shape.