CN112491476A

CN112491476A - 5G forward transmission system

Info

Publication number: CN112491476A
Application number: CN202011412611.9A
Authority: CN
Inventors: 梁坡; 周志勇; 李汉志
Original assignee: Wuhan Yongding Guangtong Technology Co ltd
Current assignee: Wuhan Yongding Guangtong Technology Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-03-12

Abstract

The invention provides a 5G forwarding system, which comprises an active antenna processing unit AAU and a baseband processing unit BBU which are connected through a single mode fiber; a first wavelength division multiplexer is deployed on the side of the active antenna processing unit AAU, and a second wavelength division multiplexer is deployed on the side of the baseband processing unit BBU, wherein the first wavelength division multiplexer includes a first optical circulator, and the second wavelength division multiplexer includes a second optical circulator. According to the scheme, the circulator is added in the system, and the function of single-fiber bidirectional communication is realized by utilizing the nonreciprocal characteristic of the circulator, so that the problem that modules on the AAU side and the BBU side need to use double-fiber bidirectional modules with different emission wavelengths is solved, the system maintenance is convenient, and the transmission capacity of the 5G fronthaul system can be greatly improved under the condition that the existing networking form is unchanged.

Description

5G forward transmission system

Technical Field

The invention relates to the field of communication, in particular to a 5G forwarding system.

Background

The 5G fronthaul network is divided into two parts, namely, an AAU (Active Antenna Unit) and a BBU (Building Base band Unit), wherein the BBU is located in a machine room, the AAU is located in a remote signal tower, and the AAU is connected to the BBU through an optical fiber, as shown in fig. 1.

At present, in the existing 5G fronthaul system, the AAU and the BBU are directly connected through one optical fiber, and the communication modules on the AAU and BBU sides must use two-fiber bidirectional modules with different emission wavelengths to carry out fronthaul, so that the system is not convenient to maintain, and the data transmission capacity is also greatly limited.

Disclosure of Invention

In view of this, the embodiment of the present invention provides a 5G forwarding system, so as to solve the problems of high maintenance difficulty and limited data transmission capacity of the existing 5G forwarding system based on a dual-fiber bidirectional module.

In a first aspect of the embodiments of the present invention, a 5G fronthaul system is provided, including an active antenna processing unit AAU and a baseband processing unit BBU connected by a single-mode fiber; a first wavelength division multiplexer is deployed on the AAU side of the active antenna processing unit, and a second wavelength division multiplexer is deployed on the BBU side of the baseband processing unit;

the active antenna processing unit AAU comprises a plurality of first optical modules, the baseband processing unit BBU comprises a plurality of second optical modules, and the first optical modules and the second optical modules are used in pairs;

the first wavelength division multiplexer at least comprises a first multiplexer, a first demultiplexer and a first optical circulator, and the second wavelength division multiplexer at least comprises a second multiplexer, a second demultiplexer and a second optical circulator.

Further, the plurality of first optical modules transmit and receive optical signals with different wavelengths; accordingly, the plurality of second optical modules receive and transmit optical signals of different wavelengths.

Further, the first optical module and the second optical module are both SFP28 optical modules.

Further, the plurality of first optical modules respectively transmit optical signals with six wavelengths of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm and 1371 nm;

correspondingly, the plurality of second optical modules respectively adopt six wavelengths of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm and 1371nm to transmit optical signals;

in the embodiment of the invention, the circulator is added in the fronthaul system, and the function of single-fiber bidirectional communication is realized by utilizing the nonreciprocal characteristic of the circulator, so that the problem that double-fiber bidirectional modules with different emission wavelengths are required to be used between modules at the AAU side and the BBU side can be solved, the problems of high maintenance difficulty and limited data transmission capacity of the 5G fronthaul system are solved, the 5G fronthaul system can be conveniently maintained, and the transmission capacity of the system is greatly improved while the existing networking form is unchanged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a conventional 5G forwarding system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a 5G forwarding system with a circulator according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a circulator single-fiber bidirectional communication principle according to an embodiment of the invention.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons skilled in the art without any inventive work shall fall within the protection scope of the present invention, and the principle and features of the present invention shall be described below with reference to the accompanying drawings.

The terms "comprises" and "comprising," when used in this specification and claims, and in the accompanying drawings and figures, are intended to cover non-exclusive inclusions, such that a process, method or system, or apparatus that comprises a list of steps or elements is not limited to the listed steps or elements. In addition, "first" and "second" are used to distinguish different objects, and are not used to describe a specific order.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a 5G forwarding system with a circulator according to an embodiment of the present invention, including:

an active antenna processing unit AAU 110 and a baseband processing unit BBU 120 connected by a Single Mode Fiber (SMF); a first wavelength division multiplexer 130 is disposed on the side of the active antenna processing unit AAU 110, and a second wavelength division multiplexer 140 is disposed on the side of the baseband processing unit BBU 120;

the active antenna processing unit AAU 110 includes a plurality of first optical modules, the baseband processing unit BBU 120 includes a plurality of second optical modules, and the first optical modules and the second optical modules are used in pairs;

the first wavelength division Multiplexer 130 at least includes a first Multiplexer (MUX), a first Demultiplexer (DEMUX), and a first optical circulator 1301, and the second wavelength division Multiplexer 140 at least includes a second Multiplexer, a second Demultiplexer, and a second optical circulator 1401.

As shown in fig. 3, when the AAU 110 sends data, the data is converted by the optical module, transmitted from 1 to 2 in the circulator to another circulator by the optical fiber, converted by the optical module from 2 to 3, and received by the BBU 120. Likewise, BBU 120 can also be sent to AAU 110 over optical fibers from 1 to 2 through a circulator. By utilizing the non-reciprocal characteristic of the circulator, the same wavelength can be transmitted in a single optical fiber, thereby realizing the function of single-fiber bidirectional communication.

In one embodiment, a plurality of first optical modules transmit and receive optical signals of different wavelengths; accordingly, the plurality of second optical modules receive and transmit optical signals of different wavelengths.

Wherein the first optical module and the second optical module are both SFP28 optical modules.

Further, the plurality of first optical modules respectively transmit optical signals with six wavelengths of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm and 1371 nm; accordingly, the plurality of second optical modules respectively transmit optical signals with six wavelengths of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm and 1371 nm.

It can be understood that, in fig. 2, for the signal transmission from the active antenna processing unit AAU to the baseband processing unit BBU, the six first optical modules send optical signals with different wavelengths to the first multiplexer, and the first multiplexer multiplexes the optical signals with the six different wavelengths into a first multiplexed signal and sends the first multiplexed signal to the first circulator, preferably, the first circulator and the second circulator are both three-port optical circulators and respectively have a first port, a second port, and a third port. The first multiplexed signal enters the first circulator through the first port, then enters the second circulator through the second port of the first optical circulator, a Single Mode Fiber (SMF) and the second port of the second circulator, and enters the second demultiplexer through the third port of the second circulator, the second demultiplexer decomposes the first multiplexed signal into six optical signals with different wavelengths, namely, the six optical signals with the wavelengths of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm and 1371nm, and the second demultiplexer sends the decomposed six optical signals with the different wavelengths to six second optical modules respectively.

For signal transmission from the baseband processing unit BBU to the active antenna processing unit AAU, the six optical modules respectively send optical signals with different wavelengths to the second multiplexer, the second multiplexer multiplexes the optical signals with the six different wavelengths into a second multiplexed signal, and sends the second multiplexed signal to the second circulator, the second multiplexed signal enters the second circulator through the first port of the second circulator, then the second multiplexed signal enters the first circulator through the second port of the second circulator, the single-mode fiber and the second port of the first circulator, and enters the first demultiplexer through the third port of the first circulator, the first demultiplexer decomposes the second multiplexed signal into optical signals with six different wavelengths, and then the first demultiplexer sends the decomposed optical signals with the six different wavelengths to the six first optical modules respectively. Through the implementation scheme, the invention realizes six-path bidirectional signal transmission and greatly improves the transmission capacity of a 5G forwarding network transmission system.

In the schematic structural diagram of the existing 5G fronthaul system provided in fig. 1, communication is performed between the active antenna processing unit AAU and the baseband processing unit BBU through two-fiber bidirectional modules with different transmission wavelengths.

Compared with the prior art shown in fig. 1, the circulator is added in the fronthaul system, and the function of single-fiber bidirectional communication is realized by utilizing the nonreciprocal characteristic of the circulator, so that the problem that modules at the AAU and BBU sides must use double-fiber bidirectional modules with different emission wavelengths is solved, the system maintenance is facilitated, and the transmission capacity of the system is doubled while the existing networking form is not changed.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A5G fronthaul system is characterized by comprising an active antenna processing unit AAU and a baseband processing unit BBU which are connected through a single mode fiber; a first wavelength division multiplexer is deployed on the AAU side of the active antenna processing unit, and a second wavelength division multiplexer is deployed on the BBU side of the baseband processing unit;

2. The system of claim 1, wherein the plurality of first optical modules transmit and receive optical signals of different wavelengths;

accordingly, the plurality of second optical modules receive and transmit optical signals of different wavelengths.

3. The system of claim 2, wherein the first and second optical modules are both SFP28 optical modules.

4. The system of claim 3, wherein the plurality of first optical modules transmit optical signals at six wavelengths of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm and 1371nm, respectively;

accordingly, the plurality of second optical modules respectively transmit optical signals with six wavelengths of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm and 1371 nm.