CN215990809U - High-frequency optical fiber extension type signal coverage system - Google Patents

Abstract

The embodiment of the utility model provides a high-frequency optical fiber expansion type signal coverage system, which comprises a Distribution Unit (DU) and a Radio Remote Unit (RRU), wherein the RRU consists of a first RRU and a second RRU connected with the first RRU through an optical fiber; the first RRU is used for performing conversion processing and analog intermediate frequency processing on a digital signal received in a downlink and transmitting an output optical signal to the second RRU; or, the RRU is configured to perform conversion processing and analog intermediate frequency processing after receiving the uplink optical signal sent by the second RRU, and output a digital signal; and the second RRU is used for carrying out up-down frequency conversion between analog intermediate frequency and high frequency.

Description

High-frequency optical fiber extension type signal coverage system

Technical Field

The utility model relates to the technical field of antennas in mobile communication, in particular to a high-frequency optical fiber extension type signal coverage system.

Background

Currently, a digital extension scheme is generally used in a high frequency indoor coverage system, that is, a Radio Remote Unit (RRU) includes complete digital processing functions, such as: digital interface, digital intermediate frequency processing, analog high frequency processing, and the like. The interface between the RRU and a signal distribution aggregation device, such as a HUB (HUB), is a digital signal.

The RRU end has all digital processing and analog processing functions. Digital intermediate frequency processing, such as DAC, ADC and FPGA or ASIC, requires a large processing bandwidth for high frequency systems. Therefore, the cost and power consumption of the RRU end are high.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a high-frequency optical fiber extension-type signal covering system according to an embodiment of the present invention.

In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:

the embodiment of the utility model provides a high-frequency optical fiber expansion type signal coverage system, which comprises a distribution unit DU and a radio remote unit RRU, wherein the RRU consists of a first RRU and a second RRU connected with the first RRU through an optical fiber; wherein the content of the first and second substances,

the first RRU is used for performing conversion processing and analog intermediate frequency processing on a digital signal received in a downlink and transmitting an output optical signal to the second RRU; or, the RRU is configured to perform conversion processing and analog intermediate frequency processing after receiving the uplink optical signal sent by the second RRU, and output a digital signal;

and the second RRU is used for carrying out up-down frequency conversion between analog intermediate frequency and high frequency.

And the frequency point of the analog intermediate frequency of each channel in the first RRU is different.

And one or more second RRUs are connected to the first RRU in an extended manner.

The first RRU is connected with the second RRU through a fiber coupling system;

the optical fiber coupling system is used for transmitting the optical signals output by the first RRU to different second RRUs in a branching way or transmitting the optical signals transmitted by different second RRUs to the first RRU in a combining way.

The first RRU is connected to the optical fiber coupling system through one optical fiber, and the optical fiber coupling system is connected with two or more second RRUs.

A Hub is further connected between the DU and the first RRU, the Hub is connected with one or more first RRUs, and different first RRUs correspond to different cells;

the Hub is used for carrying out downlink distribution and uplink aggregation of the cell digital signals.

Wherein the frequency of the intermediate frequency is 3-5 GHz.

The first RRU and the second RRU both comprise modules for performing photoelectric conversion and electro-optical conversion.

The high-frequency optical fiber extension type signal coverage system provided by the embodiment of the utility model comprises a distribution unit DU and a radio remote unit RRU, wherein the RRU consists of a first RRU and a second RRU connected with the first RRU through an optical fiber; the first RRU is used for performing conversion processing and analog intermediate frequency processing on a digital signal received in a downlink and transmitting an output optical signal to the second RRU; or, the RRU is configured to perform conversion processing and analog intermediate frequency processing after receiving the uplink optical signal sent by the second RRU, and output a digital signal; and the second RRU is used for carrying out up-down frequency conversion between analog intermediate frequency and high frequency. In the embodiment of the utility model, as the RRU _ H is responsible for analog intermediate frequency processing, most devices with high cost and high power consumption are concentrated in the RRU _ H, so that the cost and the power consumption of the RRU _ L are greatly reduced, and the high-frequency signal coverage capability with low cost is realized.

In addition, the embodiment of the utility model connects the RRU _ L and the RRU _ H through the optical fiber coupling system, realizes the copying and sending of the downlink signal and the analog combining of the uplink signal, has low realization cost and can also have the transmission capability of a far signal.

The embodiment of the utility model also realizes data distribution (expansion of a plurality of cells) of a plurality of cells by inserting Hub between DU and RRU _ H.

Drawings

Fig. 1 is a first schematic diagram of a high-frequency optical fiber expansion type signal coverage system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a high-frequency optical fiber extended signal coverage system according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a high-frequency optical fiber expansion type signal covering system according to an embodiment of the present invention;

fig. 4 is a first schematic diagram of a high-frequency optical fiber extended signal coverage system according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a high-frequency optical fiber extension-type signal coverage system according to an embodiment of the present invention.

Detailed Description

The utility model is described below with reference to the figures and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the utility model. It should be noted that, for convenience of description, only the relevant portions of the related inventions are shown in the drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The embodiment of the utility model provides a high-frequency optical fiber extension type signal coverage system, as shown in fig. 1, the system comprises a distribution unit DU and a radio remote unit RRU, wherein the RRU is composed of a first RRU and a second RRU connected with the first RRU through an optical fiber; wherein the content of the first and second substances,

the first RRU is used for performing conversion processing and analog intermediate frequency processing on a digital signal received in a downlink and transmitting an output optical signal to the second RRU; or, the RRU is configured to perform conversion processing and analog intermediate frequency processing after receiving the uplink optical signal sent by the second RRU, and output a digital signal;

and the second RRU is used for carrying out up-down frequency conversion between analog intermediate frequency and high frequency.

Here, the first RRU includes interface processing with the BBU, digital intermediate frequency processing such as DAC, ADC, and FPGA, and analog intermediate frequency processing (the intermediate frequency may be at 3-5 GHz). And the second RRU only comprises up-down frequency conversion of high frequency, generation of high frequency LO, switch control, beam control and the like.

In the embodiment of the utility model, the frequency points of the analog intermediate frequency of each channel in the first RRU are different.

In an embodiment of the present invention, as shown in fig. 2, the first RRU is connected to one or more second RRUs in an extended manner.

In an embodiment of the present invention, as shown in fig. 2, the first RRU is connected to the second RRU through a fiber coupling system;

the optical fiber coupling system is used for transmitting the optical signals output by the first RRU to different second RRUs in a branching way or transmitting the optical signals transmitted by different second RRUs to the first RRU in a combining way.

In the embodiment of the present invention, the first RRU is connected to the optical fiber coupling system through one optical fiber, and the optical fiber coupling system is connected to two or more second RRUs.

In an embodiment of the present invention, as shown in fig. 3, a Hub is further connected between the DU and the first RRU, the Hub is connected with one or more first RRUs, and different first RRUs correspond to different cells;

the Hub is used for carrying out downlink distribution and uplink aggregation of the cell digital signals.

In the embodiment of the utility model, the frequency of the intermediate frequency is 3-5 GHz.

In the embodiment of the present invention, each of the first RRU and the second RRU includes a module for performing photoelectric conversion and electro-optical conversion.

The utility model is described below in conjunction with the scenario embodiments.

The present embodiment divides the RRU in the related art into two parts, RRU _ H (first RRU) and RRU _ L (second RRU). Interface processing with the BBU, digital intermediate frequency processing such as DAC, ADC and FPGA, and analog intermediate frequency processing (the intermediate frequency can be 3-5GHz) are included in the RRU _ H. And high-performance digital devices are reduced as much as possible in the RRU _ L to reduce the cost of the RRU _ L, and the RRU _ L only comprises up-down frequency conversion of high frequency, generation of high frequency LO, switch control, beam control and the like.

In order to extend the coverage of high-frequency signals, the RRU _ H and the RRU _ L can be connected through an optical fiber coupling system, so that the capacity of connecting the RRU _ H with the plurality of RRU _ L is realized, and the coverage range is expanded. As shown in fig. 4.

Meanwhile, in order to save the number of optical fibers, the same optical fiber is used for transmitting analog intermediate frequency signals of different channels of the RRU _ H to the optical fiber coupling system. Therefore, taking the downlink direction as an example, the analog signals of each channel of RRU _ H need to be distinguished in the frequency domain by means of frequency conversion, and the output optical signals (IF1, IF2) are transmitted to the optical fiber coupling system and then transmitted to different RRU _ L through splitting (corresponding to different Beam IDs). The output signals may also include a synchronization (CLK) signal, an operation, maintenance and management (OAM) signal, etc. Here, in the case of the downlink direction, each RRU _ L receives the same optical signal transmitted by the fiber coupling system. This down-conversion can be implemented by directly configuring the LO frequency of each channel radio transceiver (transceiver) of RRU _ H. The uplink direction is similar to the downlink direction, and each RRU _ L uploads respective optical signals (slightly different from each other) to the optical fiber coupling system, and the optical signals are combined by the optical fiber coupling system and then uploaded to the RRU _ H, and then are continuously uploaded after digital intermediate frequency processing, photoelectric conversion and other operations. Wherein, both RRU _ H and RRU _ L need to be configured with optical-to-electrical conversion and electrical-to-optical conversion functions. RRU _ L performs IF selection, OAM parsing, clock generation, millimeter wave frequency conversion, and functions of optical-to-electrical conversion (downstream) and electrical-to-optical conversion (upstream).

The optical fiber coupling system has the advantages that the distance of analog intermediate frequency transmission can reach km level, the application is wide, and the cost is low.

The embodiment of the utility model can realize the expansion of one cell resource and can also realize the expansion of a plurality of cells (cells). As shown in fig. 5, data distribution of multiple cells is achieved by inserting a Hub between a DU and an RRU _ H. The Hub is used for downlink distribution and uplink aggregation of the cell digital signals.

In the embodiment of the utility model, as the RRU _ H is responsible for analog intermediate frequency processing, most devices with high cost and high power consumption are concentrated in the RRU _ H, so that the cost and the power consumption of the RRU _ L are greatly reduced, and the high-frequency signal coverage capability with low cost is realized.

In addition, the embodiment of the utility model connects the RRU _ L and the RRU _ H through the optical fiber coupling system, realizes the copying and sending of the downlink signal and the analog combining of the uplink signal, has low realization cost and can also have the transmission capability of a far signal.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (8)

1. A high-frequency optical fiber expansion type signal coverage system is characterized by comprising a distribution unit DU and a radio remote unit RRU, wherein the RRU consists of a first RRU and a second RRU connected with the first RRU through an optical fiber; wherein the content of the first and second substances,

the first RRU is used for performing conversion processing and analog intermediate frequency processing on a digital signal received in a downlink and transmitting an output optical signal to the second RRU; or, the RRU is configured to perform conversion processing and analog intermediate frequency processing after receiving the uplink optical signal sent by the second RRU, and output a digital signal;

and the second RRU is used for carrying out up-down frequency conversion between analog intermediate frequency and high frequency.

2. The system of claim 1, wherein the frequency point of the analog intermediate frequency of each channel in the first RRU is different.

3. The system of claim 1, wherein the first RRU has one or more second RRUs extended thereto.

4. The system of claim 2, wherein the first RRU is connected to the second RRU via a fiber coupling system;

the optical fiber coupling system is used for transmitting the optical signals output by the first RRU to different second RRUs in a branching way or transmitting the optical signals transmitted by different second RRUs to the first RRU in a combining way.

5. The system of claim 4, wherein the first RRU is connected to the fiber coupling system by a fiber, and wherein two or more second RRUs are connected to the fiber coupling system.

6. The system of claim 1, wherein a Hub is further connected between the DU and the first RRU, the Hub is connected with one or more first RRUs, and different first RRUs correspond to different cells;

the Hub is used for carrying out downlink distribution and uplink aggregation of the cell digital signals.

7. The system of claim 1, wherein the intermediate frequency has a frequency of 3-5 GHz.

8. The system of claim 1, wherein the first RRU and the second RRU each comprise modules for performing optical-to-electrical and electrical-to-optical conversion.

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