WO2017185732A1

WO2017185732A1 - Distributed base station system

Info

Publication number: WO2017185732A1
Application number: PCT/CN2016/107323
Authority: WO
Inventors: 詹建明; 陈长根; 苑伟涛; 蒲迎春
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-29
Filing date: 2016-11-25
Publication date: 2017-11-02
Also published as: CN107343328A; CN107343328B

Abstract

Provided in the present invention is a distributed base station system, wherein the system comprises: a baseband unit (BBU); an IQ signal aggregation distribution unit connected with the BBU by means of an optical fiber; an intermediate frequency processing unit (IFU) connected with the IQ signal aggregation distribution unit by means of an Ethernet line; a RF front-end unit (RFU) connected to the IFU by means of a power line, wherein a power line is used for transmitting an analog intermediate frequency signal. The system of the present invention solves the problems of low capacity, high project deployment costs and high maintenance costs in current indoor distributed systems in the related technology.

Description

Distributed base station system

Technical field

The present invention relates to the field of communication network technologies, and in particular to a distributed base station system.

Background technique

In recent years, the mobile broadband service has developed rapidly. The data services of the 3rd Generation Partnership Project (3GPP) standard intelligent terminals (mobile phones, data cards, iPads, etc.) directly lead to data traffic in hotspots. And the application of various mobile Internet-based APP applications is exploding, especially in indoor hotspots such as shopping malls, office buildings, hotels, shopping malls, cinemas, competition venues, airports, railway stations, subways, and data traffic is growing exponentially. In this situation, users in these indoor hotspots need to enjoy good 3G/4G/5G data services in the future.

In the indoor coverage networking system, the Distributed Antenna System (DAS) application is very common, but the system capacity is often limited, and the engineering deployment cost is relatively high, and the maintenance cost is relatively high. In view of the above problems in the related art, there is currently no effective solution.

Summary of the invention

The embodiment of the invention provides a distributed base station system, which solves at least the problems of small capacity, high engineering deployment cost and high maintenance cost of the current indoor distributed system in the related art.

According to an aspect of the present invention, a distributed base station system is provided, the system comprising: a baseband unit BBU; an IQ signal convergence distribution unit, connected to the BBU through an optical fiber; an intermediate frequency processing unit IFU, and the IQ The signal convergence distribution unit is connected by an Ethernet line; the RF front end unit RFU is connected to the intermediate frequency processing unit IFU through a power line, wherein the power line is set to transmit an analog intermediate frequency signal.

Optionally, the BBU is configured to process the baseband signal, and transmit the processed baseband signal to the IQ signal convergence distribution unit through an optical fiber; the IQ signal convergence distribution unit, Set to be an aggregate forwarding or distribution process of an IQ signal in an uplink or downlink signal processing direction, wherein the IQ signal includes: an I channel signal and a Q channel signal; and the IFU is set to be in an uplink or downlink signal processing direction. And converting the IQ signal and the differential analog intermediate frequency signal; the RFU is configured to perform mutual conversion between the differential analog intermediate frequency signal and the radio frequency signal in an uplink or downlink signal processing direction, and pass the antenna Transmitting a radio frequency signal, or receiving an uplink signal through the antenna and converting to the radio frequency signal, wherein the antenna is disposed in the RFU.

Optionally, in the downlink signal processing direction, the IFU is configured to process the I channel signal and the Q channel signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal through the power line. Go to the RFU; the RFU is configured to process the received differential analog intermediate frequency signal to obtain a downlink analog intermediate frequency signal, and convert the downlink analog intermediate frequency signal into a radio frequency signal for transmission through the antenna.

Optionally, in an uplink signal processing direction, the RFU is configured to convert an uplink signal received by the internal antenna into a radio frequency signal, and convert the radio frequency signal into a differential analog intermediate frequency signal, and pass the differential analog intermediate frequency signal Transmitting the power line to the IFU; the IFU is configured to process the received differential analog intermediate frequency signal to obtain the IQ signal, and transmit the IQ signal to the IQ signal convergence distribution unit through an Ethernet line .

Optionally, in the downlink signal processing direction, the IFU includes: an IQ baseband data transceiving processing unit, a digital upconverter DUC, a digital to analog converter DAC, an IQ modulation unit, a first differential amplifier, and a first coupler; The IQ baseband data transceiving processing unit is configured to receive an IQ signal transmitted by the IQ signal convergence distribution unit, and transmit an I channel signal and the Q channel signal in the IQ signal to the DUC; the DUC, setting Converting the I channel signal and the Q channel signal into a digital intermediate frequency signal, and transmitting the digital intermediate frequency signal to the DAC; the DAC is configured to convert the digital intermediate frequency signal into an analog intermediate frequency signal, And transmitting the analog intermediate frequency signal to the IQ modulation unit; the IQ modulation unit is configured to modulate the analog intermediate frequency signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the first a differential amplifier; the first differential amplifier configured to amplify the differential analog intermediate frequency signal and pass the amplified differential analog intermediate frequency signal through The first coupler is transmitted to a power line connected to the RFU.

Optionally, the IFU further includes: a first duplex filter; the first duplex filter is configured to receive the amplified differential analog intermediate frequency signal transmitted by the first differential amplifier, and The differential analog intermediate frequency signal is subjected to filtering processing, and the processed differential analog intermediate frequency signal is transmitted through the first coupler to a power line linked to the RFU.

Optionally, in the downlink signal processing direction, the RFU includes: a second coupler, a second duplex filter, a first variable gain attenuator, a second differential amplifier, an up-conversion unit, a power amplifier, and a third a duplex filter; the second duplex filter is configured to process the differential analog intermediate frequency signal received by the second coupler to obtain a desired downlink analog intermediate frequency signal, and the analog intermediate frequency signal Transmitting to the first variable gain attenuator; the first variable gain attenuator configured to process the downlink analog intermediate frequency signal and transmit the processed downlink analog intermediate frequency signal to the second differential The second differential amplifier is configured to process the received downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to an upconversion unit; the upconversion unit is configured to set the downlink analog The intermediate frequency signal is converted into a radio frequency signal and amplified by the power amplifier and transmitted to the antenna through the third duplex filter.

Optionally, in the downlink signal processing direction; the RFU includes: a second coupler, a first band pass filter, a first variable gain attenuator, a second differential amplifier, an up-conversion unit, a power amplifier, and a third a duplex filter; the first band pass filter is configured to process the differential analog intermediate frequency signal received by the second coupler to obtain a desired downlink analog intermediate frequency signal, and the analog intermediate frequency signal Transmitting to the first variable gain attenuator; the first variable gain attenuator configured to process the downlink analog intermediate frequency signal and transmit the processed downlink analog intermediate frequency signal to the second differential The second differential amplifier is configured to process the received downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to an upconversion unit; the upconversion unit is configured to set the downlink analog The intermediate frequency signal is converted into a radio frequency signal and amplified by the power amplifier and transmitted to the antenna through the third duplex filter.

Optionally, in the uplink signal processing direction, the RFU includes: a second coupler, a third differential amplifier, a down conversion unit, a low noise amplification LNA unit, and a third duplex filter; and the third duplex filter And configured to process an uplink signal received by the antenna to obtain a radio frequency signal, and transmit the radio frequency signal to the LNA unit; the LNA unit is configured to perform amplification processing on the radio frequency signal, and to amplify The subsequent RF signal is transmitted to the downconversion unit; the downconversion unit is configured to process the amplified RF signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the third differential amplifier The third differential amplifier is configured to amplify the differential analog intermediate frequency signal and transmit the amplified differential analog intermediate frequency signal to the power line connected to the IFU through the second coupler.

Optionally, the RFU includes: a second duplex filter; the second duplex filter is configured to receive the amplified differential analog intermediate frequency signal transmitted by the third differential amplifier, and receive the difference The analog intermediate frequency signal is processed, and the processed differential analog intermediate frequency signal is transmitted through the second coupler to a power line connected to the IFU.

Optionally, in the uplink signal processing direction, the IFU includes: an IQ baseband data transceiving processing unit, a digital down conversion DDC, an analog to digital converter ADC, an IQ modulation unit, a fourth differential amplifier, and a second variable gain attenuator. a first duplex filter, and a first coupler, configured to convert the differential analog intermediate frequency signal transmitted by the RFU through the first coupler into an analog intermediate frequency signal, and Transmitting the analog intermediate frequency signal to the second variable gain attenuator; the second variable gain attenuator is configured to process the analog intermediate frequency signal and transmit the processed analog intermediate frequency signal to the The fourth differential amplifier is configured to process the analog intermediate frequency signal to obtain an amplified differential analog intermediate frequency signal, and transmit the amplified differential analog intermediate frequency signal to the IQ modulation unit; The IQ modulation unit is configured to process the amplified differential analog intermediate frequency signal to obtain a non-differential analog intermediate frequency signal, and the non-differential analog intermediate frequency signal And input to the analog-to-digital converter ADC; the analog-to-digital converter ADC is configured to convert the non-differential analog intermediate frequency signal to obtain a digital intermediate frequency signal, and transmit the digital intermediate frequency signal to the digital down-conversion DDC Digital down-conversion DDC, configured to process the digital intermediate frequency signal to obtain IQ The baseband signal is transmitted to the Ethernet line connected to the IQ signal aggregation distribution unit by an IQ baseband data transceiving processing unit.

Optionally, in the uplink signal processing direction, the IFU includes: an IQ baseband data transceiving processing unit, a digital down conversion DDC, an analog to digital converter ADC, an IQ modulation unit, a fourth differential amplifier, and a second variable gain attenuator. a second band pass filter, and a second band pass filter, configured to convert the differential analog intermediate frequency signal transmitted by the RFU through the first coupler into an analog intermediate frequency signal, and Transmitting the analog intermediate frequency signal to the second variable gain attenuator; the second variable gain attenuator is configured to process the analog intermediate frequency signal and transmit the processed analog intermediate frequency signal to the The first differential amplifier is configured to process the analog intermediate frequency signal to obtain an amplified differential analog intermediate frequency signal, and transmit the amplified differential analog intermediate frequency signal to the IQ modulation unit; The IQ modulation unit is configured to process the amplified differential analog intermediate frequency signal to obtain a non-differential analog intermediate frequency signal, and the non-differential analog intermediate frequency signal And input to the analog-to-digital converter ADC; the analog-to-digital converter ADC is configured to convert the non-differential analog intermediate frequency signal to obtain a digital intermediate frequency signal, and transmit the digital intermediate frequency signal to the digital down-conversion DDC The digital down-conversion DDC is configured to process the digital intermediate frequency signal to obtain an IQ baseband signal, and transmit the IQ baseband signal to an Ethernet line connected to the IQ signal convergence distribution unit through an IQ baseband data transceiving processing unit.

Optionally, the IFU further includes: a power module; and the power module is configured to obtain a DC power source through an Ethernet cable.

Optionally, one or more RFUs are connected to the same power line of the IFU.

Optionally, the IQ signal aggregation distribution unit is connected to one or more IFUs, wherein each IFU is connected to the IQ signal aggregation distribution unit through a separate Ethernet line when there are multiple IFUs.

In this embodiment, the system includes: a baseband unit BBU 102; an IQ signal aggregation distribution unit 104 connected to the BBU 102 through an optical fiber; an intermediate frequency processing unit IFU 106, and an IQ signal aggregation distribution unit 104 connected through an Ethernet line; Front end unit The RFU 108 is connected to the intermediate frequency processing unit IFU 106 via a power line, wherein the power line is arranged to transmit an analog intermediate frequency signal. It can be seen that, through the system of the embodiment, the indoor wireless signal coverage can be quickly realized, and the engineering deployment cost is low, the maintenance cost is low, and the system capacity is high; thereby solving the current technology, the indoor distributed system has small capacity, and the engineering deployment cost is high. The problem of high maintenance costs.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic structural diagram of a distributed base station system according to an embodiment of the present invention;

2a is a schematic structural diagram 1 of an IFU including a duplex filter according to an embodiment of the present invention;

2b is a schematic structural diagram 2 of an IFU including a band pass filter according to an embodiment of the present invention;

2c is a schematic structural diagram 1 of an RFU including a duplex filter according to an embodiment of the present invention;

2d is a schematic structural diagram of an RFU including a band pass filter according to an embodiment of the present invention.

3 is a schematic diagram showing the internal structure of an intermediate frequency processing unit IFU including a duplex filter according to an embodiment of the present invention;

4 is a schematic diagram showing the internal structure of an intermediate frequency processing unit IFU including a band pass filter according to an embodiment of the present invention;

5 is a schematic diagram of an internal structure of a radio frequency front end unit RFU including a duplex filter according to an embodiment of the present invention;

6 is a schematic diagram of an internal structure of a radio frequency front end unit RFU including a band pass filter according to an embodiment of the present invention;

7 is a schematic diagram of a plurality of radio frequency front end units RFUs connected to the same power line network according to an embodiment of the present invention;

8 is an IQ signal convergence distribution unit and multiple intermediate frequency processing orders according to an embodiment of the present invention; Schematic diagram of star networking between meta-IFUs.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

Example 1

The present embodiment provides a distributed base station system. FIG. 1 is a schematic structural diagram of a distributed base station system according to an embodiment of the present invention. As shown in FIG. 1 , the system includes: a baseband unit BBU 102; an IQ signal aggregation distribution unit 104. The intermediate frequency processing unit IFU 106 is connected to the IQ signal aggregation unit 104 via an Ethernet cable; the RF front end unit RFU 108 is connected to the intermediate frequency processing unit IFU 106 via a power line, wherein the power line is configured to transmit an analog intermediate frequency signal.

It can be seen that, through the foregoing solution of the embodiment, the indoor wireless signal coverage can be quickly realized, and the engineering deployment cost is low, the maintenance cost is low, and the system capacity is high; thereby solving the current indoor distributed system capacity, high engineering deployment cost, and maintenance cost. High problem.

For the unit involved in the foregoing embodiment, the unit-pair signal processing method involved in the optional implementation manner of this embodiment may be:

The BBU 102 is configured to process the baseband signal, and transmit the processed baseband signal to the IQ signal convergence distribution unit 104 through the optical fiber;

The IQ signal aggregation distribution unit 104 is configured to perform an aggregate forwarding or distribution process of the IQ signal in an uplink or downlink signal processing direction, where the IQ signal includes: an I channel signal and a Q channel signal;

The IFU 106 is configured to perform mutual conversion between the IQ signal and the differential analog intermediate frequency signal in an uplink or downlink signal processing direction;

The RFU 108 is configured to convert the differential analog intermediate frequency signal and the radio frequency signal into each other in an uplink or downlink signal processing direction, and transmit the radio frequency signal through the antenna, or receive the uplink signal through the antenna and convert the signal into an RF signal.

The scheme of this embodiment will be described in detail through two aspects of uplink and downlink;

(1) in the direction of downlink signal processing;

IFU106, configured to process the I signal and the Q signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the RFU through the power line;

The RFU is configured to process the received differential analog intermediate frequency signal to obtain a downlink analog intermediate frequency signal, and convert the downlink analog intermediate frequency signal into a radio frequency signal for transmission through the antenna.

The IFU and RFU in this embodiment are introduced in the downlink signal processing direction according to the functions of the IFU 106 and the RFU 108 in combination with the specific application scenarios.

Among them, the deployment of the internal components of the IFU106 has two ways:

D1-1:

The IFU 106 can include: an IQ baseband data transceiving processing unit, a digital upconverter DUC, a digital to analog converter DAC, an IQ modulation unit, a first differential amplifier, and a first coupler; the IQ baseband data transceiving processing unit configured to receive The IQ signal aggregates the IQ signal transmitted by the distribution unit, and transmits the I channel signal and the Q channel signal in the IQ signal to the DUC; the DUC is configured to convert the I channel signal and the Q channel signal into a digital intermediate frequency signal, and the digital intermediate frequency signal Transmitted to the DAC; the DAC is configured to convert the digital intermediate frequency signal into an analog intermediate frequency signal and transmit the analog intermediate frequency signal to the IQ modulation unit; the IQ modulation unit is configured to modulate the analog intermediate frequency signal to obtain a differential analog intermediate frequency signal, and The differential analog intermediate frequency signal is transmitted to the first differential amplifier; the first differential amplifier is configured to amplify the differential analog intermediate frequency signal and transmit the amplified differential analog intermediate frequency signal to the power line connected to the RFU through the first coupler.

D1-2: based on the IFU 106 in the downlink signal processing direction, in the optional embodiment, the IFU 106 may further include: a first duplex filter in addition to the deployment of the foregoing components; wherein, the first duplex filter , configured to receive the amplified differential analog intermediate frequency signal transmitted by the first differential amplifier, and filter the amplified differential analog intermediate frequency signal, and after processing The differential analog IF signal is transmitted through the first coupler to the power line linked to the RFU.

In the downstream signal processing direction, the internal components of the RFU 108 are deployed in two ways:

D2-1:

The RFU 108 may include: a second coupler, a second duplex filter, a first variable gain attenuator, a second differential amplifier, an up-conversion unit, a power amplifier, a third duplex filter; a second duplex filter, And configured to process the differential analog intermediate frequency signal received by the second coupler to obtain a desired downlink analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the first variable gain attenuator; the first variable gain attenuator, It is configured to process the downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to the second differential amplifier; the second differential amplifier is configured to process the received downlink analog intermediate frequency signal, and process the processed downlink The analog intermediate frequency signal is transmitted to the up-conversion unit; the up-conversion unit is configured to convert the downlink analog intermediate frequency signal into a radio frequency signal, and is amplified by the power amplifier and sent to the antenna through the third duplex filter.

D2-2:

The RFU 108 includes: a second coupler, a first band pass filter, a first variable gain attenuator, a second differential amplifier, an upconversion unit, a power amplifier, a third duplex filter; a first band pass filter, And configured to process the differential analog intermediate frequency signal received by the second coupler to obtain a desired downlink analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the first variable gain attenuator; the first variable gain attenuator, It is configured to process the downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to the second differential amplifier; the second differential amplifier is configured to process the received downlink analog intermediate frequency signal, and process the processed downlink The analog intermediate frequency signal is transmitted to the up-conversion unit; the up-conversion unit is configured to convert the downlink analog intermediate frequency signal into a radio frequency signal, and is amplified by the power amplifier and sent to the antenna through the third duplex filter.

It can be seen from the above D2-1 and D2-2 that the deployment of two different RFUs is different in that between the second coupler and the first variable gain attenuator, a second duplex filter or a first band can be provided. Pass filter.

(2) in the direction of uplink signal processing;

The RFU 108 is configured to convert an uplink signal received by the internal antenna into a radio frequency signal, and convert the radio frequency signal into a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the IFU through the power line;

The IFU 106 is configured to process the received differential analog intermediate frequency signal to obtain an IQ signal, and transmit the IQ signal to the IQ signal convergence distribution unit through an Ethernet line.

The IFU and RFU in this embodiment are introduced in the uplink signal processing direction according to the functions of the IFU 106 and the RFU 108 in combination with the specific application scenarios.

In the direction of uplink signal processing, the internal components of the RFU 108 are deployed in two ways:

U2-1:

The RFU 108 includes: a second coupler, a third differential amplifier, a down conversion unit, a low noise amplification LNA unit, and a third duplex filter;

The third duplex filter is configured to process the uplink signal received by the antenna to obtain a radio frequency signal, and transmit the radio frequency signal to the LNA unit; the LNA unit is configured to amplify the radio frequency signal, and after amplification The RF signal is transmitted to the downconversion unit; the downconversion unit is configured to process the amplified RF signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the third differential amplifier; the third differential amplifier is set to be The differential analog IF signal is amplified and the amplified differential analog IF signal is transmitted through a second coupler to a power line connected to the IFU.

U2-2:

In an optional implementation manner of the embodiment, the RFU 108 may further include: a second duplex filter, where the second duplex filter is configured to receive the amplification of the third differential amplifier transmission. The differential analog IF signal is processed, and the received differential analog IF signal is processed, and the processed differential analog IF signal is transmitted to the power line connected to the IFU through the second coupler.

In the uplink signal processing direction, the internal components of the IFU 106 are deployed in two ways:

U1-1: The IFU 106 may include: an IQ baseband data transceiving processing unit, a digital downconverting DDC, an analog to digital converter ADC, an IQ modulation unit, a fourth differential amplifier, a second variable gain attenuator, and a first duplex filter. And a first coupler;

The first duplex filter is configured to convert the differential analog intermediate frequency signal transmitted by the first coupler to the RFU into an analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the second variable gain attenuator; a gain attenuator configured to process the analog intermediate frequency signal and transmit the processed analog intermediate frequency signal to a fourth differential amplifier; the fourth differential amplifier is configured to process the analog intermediate frequency signal to obtain an amplified differential analog intermediate frequency signal, And transmitting the amplified differential analog intermediate frequency signal to the IQ modulation unit; the IQ modulation unit is configured to process the amplified differential analog intermediate frequency signal to obtain a non-differential analog intermediate frequency signal, and transmit the non-differential analog intermediate frequency signal to the analog to digital conversion ADC, analog-to-digital converter ADC, is set to convert the non-differential analog IF signal to obtain the digital IF signal, and transmit the digital IF signal to the digital down-conversion DDC; digital down-conversion DDC, set to process the digital IF signal IQ baseband signal, and pass IQ baseband signal through IQ baseband data transceiver processing unit It is input to the Ethernet cable connected to the IQ signal aggregation distribution unit.

U1-2:

The IFU includes: an IQ baseband data transceiving processing unit, a digital downconverting DDC, an analog to digital converter ADC, an IQ modulation unit, a fourth differential amplifier, a second variable gain attenuator, a second band pass filter, and a first coupling Device

Wherein, the second band pass filter is configured to convert the differential analog intermediate frequency signal transmitted by the first coupler receiving RFU into an analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the second variable gain attenuator; a gain attenuator configured to process the analog intermediate frequency signal and transmit the processed analog intermediate frequency signal to a fourth differential amplifier; the fourth differential amplifier is configured to process the analog intermediate frequency signal to obtain an amplified differential analog intermediate frequency signal, And transmitting the amplified differential analog intermediate frequency signal to the IQ modulation unit; the IQ modulation unit is configured to process the amplified differential analog intermediate frequency signal to obtain a non-differential analog intermediate frequency signal, and transmit the non-differential analog intermediate frequency signal to the analog to digital conversion ADC; analog-to-digital converter ADC, set to non-differential The analog intermediate frequency signal is converted to obtain a digital intermediate frequency signal, and the digital intermediate frequency signal is transmitted to the digital down conversion DDC; the digital down conversion DDC is set to process the digital intermediate frequency signal to obtain an IQ baseband signal, and the IQ baseband data transceiving processing unit will be the IQ The baseband signal is transmitted to an Ethernet line connected to the IQ signal aggregation distribution unit.

Optionally, the IFU of this embodiment may further include: a power module; and a power module configured to obtain a DC power source through an Ethernet cable.

In addition, one or more RFUs are connected to the same power line of the IFU. The IQ signal aggregation distribution unit may be connected by one or more IFUs, wherein each IFU is connected to the IQ signal aggregation distribution unit through a separate Ethernet line when there are multiple IFUs.

It can be seen from the above description that in the present embodiment, the IFU and the RFU have two modes in the uplink and downlink directions respectively, that is, the IFU 106 includes: U1-1 and U1-2 on the uplink; and D1- on the downlink. 1 and D1-2; and the RFU includes: U2-1 and U2-2 on the uplink; and D2-1 and D2-2 on the downlink; therefore, the above IFU and RFU can be combined into four according to the combination arrangement manner. combination;

2a to 2d, wherein FIG. 2a is a schematic structural diagram 1 of an IFU including a duplex filter according to an embodiment of the present invention, and FIG. 2b is a schematic structural diagram of an IFU including a bandpass filter according to an embodiment of the present invention. 2 is a schematic structural diagram 1 of an RFU including a duplex filter according to an embodiment of the present invention; FIG. 2 is a schematic structural diagram 2 of an RFU including a bandpass filter according to an embodiment of the present invention;

2a is the IFU after the combination of D1-2 and U1-1, FIG. 2b is the IFU after the combination of D1-1 and U1-2; FIG. 2c is the RFU after the combination of U2-2 and D2-1, and FIG. 2d is The RFU after combining U2-1 and D2-2.

It should be noted that the above combination is only a preferred mode of the present invention, and other combinations are also within the protection scope of the present invention, and details are not described herein again.

Example 2

The invention provides a novel indoor coverage distributed system, which is composed of a baseband unit (BBU), an IQ signal aggregation distribution unit, and an intermediate frequency processing unit. (Intermediate Frequency Unit, referred to as IFU), and Radio Front Unit (RFU);

The baseband unit BBU and the IQ signal convergence distribution unit are connected by an optical fiber, the IQ signal aggregation distribution unit and the intermediate frequency processing unit IFU are connected by an Ethernet line, and the intermediate frequency processing unit IFU and the RF front end unit RFU are connected by a power line, and the RF front end unit RFU is connected. Integrated antenna.

This embodiment adopts the following optional technical solutions:

The implementation of the indoor coverage distributed system technical solution will be further described in detail below with reference to the accompanying drawings:

The system consists of four units: a baseband unit BBU, an IQ signal aggregation distribution unit, an intermediate frequency processing unit IFU, and a radio frequency front end unit RFU; wherein the baseband unit BBU and the IQ signal convergence distribution unit are connected by an optical fiber, and the IQ signal convergence distribution unit The intermediate frequency processing unit IFU is connected through an Ethernet line, the intermediate frequency processing unit IFU and the RF front end unit RFU are connected by a power line, and the antenna is integrated in the RF front end unit RFU.

The BBU completes the uplink and downlink baseband signal processing of the 2G/3G/4G/5G, and the BBU is connected to the IQ signal aggregation distribution unit through the optical fiber transmission medium, and the common public radio interface is followed between the baseband unit BBU and the IQ signal aggregation distribution unit (Common Public The Radio Interface (CPRI) interface, the IQ signal aggregation distribution unit and the intermediate frequency processing unit IFU are connected via an Ethernet cable, and also follow the CPRI general public radio interface.

The internal processing principle of the intermediate frequency processing unit IFU:

The PoE power take-off module inside the IFU of the IF processing unit obtains DC power through the Ethernet cable.

In the downstream signal processing direction;

The IQ baseband data transceiving processing unit receives the IQ signal sent from the IQ signal convergence distribution unit through the Ethernet line to obtain the I channel signal and the Q channel signal, and the I channel signal and the Q channel signal are digitally upconverted (DUC) into a digital intermediate frequency signal. Then the digital IF signal passes through the DAC number The analog conversion becomes an analog intermediate frequency signal, and the analog intermediate frequency signal is modulated into a differential analog intermediate frequency signal by an IQ modulation module, and the differential analog intermediate frequency signal is amplified by a differential amplifier, and the amplified differential analog intermediate frequency signal can be output through a duplex filter and then passed through a coupler. Coupling to two power lines for transmission, as shown in FIG. 3, FIG. 3 is a schematic diagram of an internal structure of an intermediate frequency processing unit IFU including a duplex filter according to an embodiment of the present invention; the amplified differential analog intermediate frequency signal can also directly pass through the coupler. As shown in FIG. 4, FIG. 4 is a schematic diagram showing the internal structure of an intermediate frequency processing unit IFU including a band pass filter according to an embodiment of the present invention.

In the direction of uplink signal processing;

The intermediate frequency processing unit IFU receives the differential analog intermediate frequency signal from the power line through the coupler coupling, and the differential analog intermediate frequency signal can be converted into the required uplink analog intermediate frequency signal through the duplex filter, as shown in FIG. The differential analog IF signal can also be converted to the desired upstream analog IF signal by a bandpass filter, as shown in Figure 4. The uplink analog IF signal is processed by a variable gain attenuator and a differential amplifier, and the amplified differential analog IF signal is converted into a non-differential analog IF signal by an IQ demodulation module, and then converted into a digital intermediate frequency signal by an ADC analog to digital IF signal. The digital down conversion (DDC) becomes an IQ baseband signal, which is then sent to the IQ signal aggregation distribution unit on the Ethernet line through the I/Q baseband data transceiving processing module.

RF front-end unit RFU internal processing principle

In the downstream signal processing direction;

The differential analog intermediate frequency signal is received from the power line through the coupler coupling, and the differential analog intermediate frequency signal can be converted into the required downlink analog intermediate frequency signal by using the duplex filter, as shown in FIG. 5 , which is provided by the embodiment of the present invention. Schematic diagram of the internal structure of the RFU front-end unit RFU. The differential analog IF signal can also be converted into a desired downlink analog IF signal by a band pass filter, as shown in FIG. 6. FIG. 6 is a schematic diagram showing the internal structure of the RF front end unit RFU including the band pass filter according to the embodiment of the present invention. Then, the downlink analog IF signal is processed by the variable gain attenuator and the differential amplifier, and the downlink analog IF signal is converted into an RF signal by up-conversion, the RF signal is amplified by the power amplifier, and finally transmitted to the built-in antenna through the duplex filter.

In terms of uplink signals;

The uplink signal is received by the built-in antenna, and the uplink signal is processed by the duplexer filter, and then subjected to low-noise amplifier (LNA) amplification processing, and the amplified RF signal is converted into a differential analog intermediate frequency signal by down-conversion, and the differential analog intermediate frequency signal passes through the differential. The amplifier is amplified, and the amplified differential analog IF signal can be output through a duplex filter and then coupled through a coupler to two power lines, as shown in Figure 4. The amplified differential analog IF signal can also be coupled directly to the two power lines via the coupler, as shown in Figure 5.

It can be seen that, on the one hand, the indoor wireless capacity is improved on the one hand, and the engineering construction cost is reduced on the other hand, and the quick opening is realized. Furthermore, the problem of small capacity of the indoor distributed system, high engineering deployment cost, and high maintenance cost is solved.

Example 3

The indoor coverage distributed system supports the following two networking modes;

In a first embodiment, two or more radio frequency front-end unit RFUs are connected to the same power line network. As shown in FIG. 7, FIG. 7 is a schematic diagram of a plurality of radio frequency front-end unit RFUs connected to the same power line network according to an embodiment of the present invention. .

The second embodiment is a star network between the IQ signal aggregation distribution unit and the two or more intermediate frequency processing units IFU. As shown in FIG. 8, FIG. 8 is an IQ signal aggregation distribution unit and multiple intermediate frequency processing according to an embodiment of the present invention. Schematic diagram of the star network between the units IFU.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

In this embodiment, the system includes: a baseband unit BBU 102; an IQ signal aggregation distribution unit 104 connected to the BBU 102 through an optical fiber; an intermediate frequency processing unit IFU 106, and an IQ signal aggregation distribution unit 104 connected through an Ethernet line; The front end unit RFU 108 is connected to the intermediate frequency processing unit IFU 106 via a power line, wherein the power line is used to transmit an analog intermediate frequency signal. It can be seen that, through the system of the embodiment, the indoor wireless signal coverage can be quickly realized, and the engineering deployment cost is low, the maintenance cost is low, and the system capacity is high; thereby solving the current technology, the indoor distributed system has small capacity, and the engineering deployment cost is high. The problem of high maintenance costs.

Claims

A distributed base station system, the system comprising:

Baseband unit BBU;

An IQ signal convergence distribution unit connected to the BBU through an optical fiber;

The intermediate frequency processing unit IFU is connected to the IQ signal aggregation and distribution unit through an Ethernet cable;

The RF front end unit RFU is connected to the intermediate frequency processing unit IFU through a power line, wherein the power line is configured to transmit an analog intermediate frequency signal.
The system of claim 1 wherein

The BBU is configured to process the baseband signal, and transmit the processed baseband signal to the IQ signal convergence distribution unit through the optical fiber;

The IQ signal convergence distribution unit is configured to perform aggregation forwarding or distribution processing of the IQ signal in an uplink or downlink signal processing direction, where the IQ signal includes: an I channel signal and a Q channel signal;

The IFU is configured to perform mutual conversion between the IQ signal and the differential analog intermediate frequency signal in an uplink or downlink signal processing direction;

The RFU is configured to perform mutual conversion between the differential analog intermediate frequency signal and the radio frequency signal in an uplink or downlink signal processing direction, and transmit the radio frequency signal through the antenna, or receive the uplink signal through the antenna and convert the signal into The radio frequency signal, wherein the antenna is disposed in the RFU.
The system of claim 2 wherein in the downstream signal processing direction;

The IFU is configured to process the I channel signal and the Q channel signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the RFU through the power line;

The RFU is configured to process the received differential analog intermediate frequency signal to obtain a downlink analog intermediate frequency signal, and convert the downlink analog intermediate frequency signal into a radio frequency signal for transmission through the antenna.
The system of claim 2 wherein in the direction of uplink signal processing;

The RFU is configured to convert an uplink signal received by the internal antenna into a radio frequency signal, and convert the radio frequency signal into a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the IFU through the power line;

The IFU is configured to process the received differential analog intermediate frequency signal to obtain the IQ signal, and transmit the IQ signal to the IQ signal convergence distribution unit through an Ethernet line.
The system according to claim 3, wherein in the downlink signal processing direction; the IFU comprises: an IQ baseband data transceiving processing unit, a digital upconverter DUC, a digital to analog converter DAC, an IQ modulation unit, and a first differential amplifier. And a first coupler;

The IQ baseband data transceiving processing unit is configured to receive an IQ signal transmitted by the IQ signal convergence distribution unit, and transmit the I channel signal and the Q channel signal in the IQ signal to the DUC;

The DUC is configured to convert the I channel signal and the Q channel signal into a digital intermediate frequency signal, and transmit the digital intermediate frequency signal to the DAC;

The DAC is configured to convert the digital intermediate frequency signal into an analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the IQ modulation unit;

The IQ modulation unit is configured to modulate the analog intermediate frequency signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the first differential amplifier;

The first differential amplifier is configured to amplify the differential analog intermediate frequency signal, And amplifying the amplified differential analog intermediate frequency signal through the first coupler to a power line connected to the RFU.
The system of claim 5 wherein said IFU further comprises: a first duplex filter;

The first duplex filter is configured to receive the amplified differential analog intermediate frequency signal transmitted by the first differential amplifier, filter the amplified differential analog intermediate frequency signal, and filter the processed differential analog intermediate frequency A signal is transmitted through the first coupler to a power line linked to the RFU.
The system of claim 3 wherein in the downstream signal processing direction; said RFU comprises: a second coupler, a second duplex filter, a first variable gain attenuator, a second differential amplifier, an upconversion Unit, power amplifier, third duplex filter;

The second duplex filter is configured to process the differential analog intermediate frequency signal received by the second coupler to obtain a desired downlink analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the first a variable gain attenuator;

The first variable gain attenuator is configured to process the downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to the second differential amplifier;

The second differential amplifier is configured to process the received downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to the upconversion unit;

The up-conversion unit is configured to convert the downlink analog intermediate frequency signal into a radio frequency signal, and is amplified by the power amplifier and sent to the antenna through the third duplex filter.
The system of claim 3, wherein in the downstream signal processing direction; the RFU comprises: a second coupler, a first band pass filter, a first variable gain attenuator, a second differential amplifier, an upconversion Unit, power amplifier, third duplex filter;

The first band pass filter is configured to process the differential analog intermediate frequency signal received by the second coupler to obtain a desired downlink analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the first a variable gain attenuator;

The first variable gain attenuator is configured to process the downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to the second differential amplifier;

The second differential amplifier is configured to process the received downlink analog intermediate frequency signal, and transmit the processed downlink analog intermediate frequency signal to the upconversion unit;

The up-conversion unit is configured to convert the downlink analog intermediate frequency signal into a radio frequency signal, and is amplified by the power amplifier and sent to the antenna through the third duplex filter.
The system according to claim 4, wherein in the uplink signal processing direction, the RFU comprises: a second coupler, a third differential amplifier, a down conversion unit, a low noise amplification LNA unit, and a third duplex filter;

The third duplex filter is configured to process an uplink signal received by the antenna to obtain a radio frequency signal, and transmit the radio frequency signal to the LNA unit;

The LNA unit is configured to perform amplification processing on the radio frequency signal, and transmit the amplified radio frequency signal to the down conversion unit;

The down conversion unit is configured to process the amplified RF signal to obtain a differential analog intermediate frequency signal, and transmit the differential analog intermediate frequency signal to the third differential amplifier;

The third differential amplifier is configured to perform amplification processing on the differential analog intermediate frequency signal, and transmit the amplified differential analog intermediate frequency signal to the power line connected to the IFU through the second coupler.
The system of claim 9 wherein said RFU comprises: a second duplex filter;

The second duplex filter is configured to receive the amplified differential analog intermediate frequency signal transmitted by the third differential amplifier, and perform filtering processing on the received differential analog intermediate frequency signal, and filter the differential analog intermediate frequency after processing A signal is transmitted through the second coupler to a power line connected to the IFU.
The system according to claim 4, wherein in the uplink signal processing direction, the IFU comprises: an IQ baseband data transceiving processing unit, a digital downconverting DDC, an analog to digital converter ADC, an IQ modulation unit, a fourth differential amplifier, a second variable gain attenuator, a first duplex filter, and a first coupler;

The first duplex filter is configured to convert a differential analog intermediate frequency signal received by the RFU through the first coupler into an analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the second variable Gain attenuator

The second variable gain attenuator is configured to process the analog intermediate frequency signal and transmit the processed analog intermediate frequency signal to the fourth differential amplifier;

The fourth differential amplifier is configured to process the analog intermediate frequency signal to obtain an amplified differential analog intermediate frequency signal, and transmit the amplified differential analog intermediate frequency signal to the IQ modulation unit;

The IQ modulation unit is configured to process the amplified differential analog intermediate frequency signal to obtain a non-differential analog intermediate frequency signal, and transmit the non-differential analog intermediate frequency signal to the analog to digital converter ADC;

The analog-to-digital converter ADC is configured to convert the non-differential analog intermediate frequency signal to obtain a digital intermediate frequency signal, and transmit the digital intermediate frequency signal to the digital down-converted DDC;

The digital down-conversion DDC is configured to process the digital intermediate frequency signal to obtain an IQ baseband signal, and transmit the IQ baseband signal to an Ethernet line connected to the IQ signal convergence distribution unit through an IQ baseband data transceiving processing unit.
The system according to claim 4, wherein in the uplink signal processing direction, the IFU comprises: an IQ baseband data transceiving processing unit, a digital downconverting DDC, an analog to digital converter ADC, an IQ modulation unit, a fourth differential amplifier, a second variable gain attenuator, a second band pass filter, and a first coupler;

The second band pass filter is configured to convert the differential analog intermediate frequency signal received by the RFU through the first coupler into an analog intermediate frequency signal, and transmit the analog intermediate frequency signal to the second variable Gain attenuator

The second variable gain attenuator is configured to process the analog intermediate frequency signal and transmit the processed analog intermediate frequency signal to the fourth differential amplifier;

The fourth differential amplifier is configured to process the analog intermediate frequency signal to obtain an amplified differential analog intermediate frequency signal, and transmit the amplified differential analog intermediate frequency signal to the IQ modulation unit;

The IQ modulation unit is configured to process the amplified differential analog intermediate frequency signal to obtain a non-differential analog intermediate frequency signal, and transmit the non-differential analog intermediate frequency signal to the analog to digital converter ADC;

The analog-to-digital converter ADC is configured to convert the non-differential analog intermediate frequency signal to obtain a digital intermediate frequency signal, and transmit the digital intermediate frequency signal to the digital down-converted DDC;

The digital down-conversion DDC is configured to process the digital intermediate frequency signal to obtain an IQ baseband signal, and transmit the IQ baseband signal to an Ethernet line connected to the IQ signal convergence distribution unit through an IQ baseband data transceiving processing unit.
The system of any of claims 5, 6, 11, and 12, wherein the IFU further comprises: a power module;

The power module is configured to obtain a DC power source through an Ethernet cable.
The system of claim 1 wherein one or more RFUs are connected to the same power line of the IFU.
The system according to claim 1 or 14, wherein said IQ signal aggregation distribution unit is connected to one or more IFUs, wherein when there are a plurality of IFUs, each IFU passes through a separate Ethernet line and said The IQ signal aggregation distribution unit is connected.