CN108541082B

CN108541082B - Distributed base station

Info

Publication number: CN108541082B
Application number: CN201810274066.8A
Authority: CN
Inventors: 柳斯白; 田崇利
Original assignee: New H3C Technologies Co Ltd Chengdu Branch
Current assignee: New H3C Technologies Co Ltd Chengdu Branch
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2021-10-12
Anticipated expiration: 2038-03-29
Also published as: CN108541082A

Abstract

The utility model provides a distributed base station, which comprises a baseband processing unit, a first radio frequency unit group and a second radio frequency unit group, wherein the baseband processing unit is star-shaped networked with the first radio frequency unit group and the second radio frequency unit group; the first radio frequency unit group comprises a first radio frequency remote unit, a first connector and a first repairing unit, an antenna feeder interface of the first radio frequency remote unit is connected with an information source port of the first connector, and the first repairing unit is connected between a second optical port of the first radio frequency remote unit and the information source port of the first connector; the second radio frequency unit group comprises a second radio frequency remote unit, a second connector and a second repairing unit, an antenna feeder interface of the second radio frequency remote unit is connected with an information source port of the second connector, and the second repairing unit is connected between a second optical port of the second radio frequency remote unit and the information source port of the second connector, so that the baseband processing unit with abnormal connection and the second radio frequency remote unit can still communicate.

Description

Distributed base station

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a distributed base station.

Background

After user data from a core network is processed internally by a baseband processing Unit (BBU), the BBU communicates with a Radio Remote Unit (RRU) by using an optical fiber as a medium, the RRU processes an optical signal sent by a BBU side and modulates the optical signal to an antenna feed Interface, the antenna feed Interface is sent to an antenna by a connector, the connector can be a Point of Interface (POI), and the antenna can be a leaky cable.

The networking mode of the BBU and the RRU generally includes a chain type networking and a star type networking, the distributed base station networking applied to the subway generally adopts the star type networking (as shown in fig. 1), at least two leakage cables are usually laid along the top of a subway line, the leakage cables are connected with an antenna feeder interface of the RRU to serve as a radiation unit of the RRU, and the RRU is connected with the BBU by an optical fiber. That is, one BBU is connected to different RRUs through optical fibers, and there is no optical fiber connection between the RRUs. The BBU and each RRU may be connected by one optical fiber (as shown in fig. 2); it is also possible to connect via two optical fibers (as shown in fig. 3), one of which serves as a backup fiber if two fibers are used.

However, the environment of the subway line is complex, and the optical fiber between the BBU and the RRU may be damaged, which causes abnormal connection between the BBU and the RRU, so that the RRU with abnormal connection cannot communicate with the BBU.

Disclosure of Invention

In a first aspect, an embodiment of the present disclosure provides a distributed base station, including a baseband processing unit, and further including at least a first radio frequency unit group and a second radio frequency unit group, where the baseband processing unit is star-networked with the first radio frequency unit group and the second radio frequency unit group;

the first radio frequency unit group comprises a first radio frequency remote unit, a first connector and a first repair unit, an antenna feeder interface of the first radio frequency remote unit is connected with an information source port of the first connector, the first radio frequency unit group is connected with the baseband processing unit through a first optical port of the first radio frequency remote unit, and the first repair unit is connected between a second optical port of the first radio frequency remote unit and the information source port of the first connector;

the second radio frequency unit group comprises a second radio frequency remote unit, a second connector and a second repair unit, an antenna feeder interface of the second radio frequency remote unit is connected with an information source port of the second connector, the second radio frequency unit group is connected with the baseband processing unit through a first optical port of the second radio frequency remote unit, and the second repair unit is connected between a second optical port of the second radio frequency remote unit and an information source port of the second connector;

the first connector of the first radio frequency unit group is connected with the second connector of the second radio frequency unit group through a leaky cable;

when the second remote radio unit is abnormally connected with the baseband processing unit, the first radio unit group and the second radio unit group form a cascade link, and the first repair unit is configured to modulate an optical signal carrying downlink data sent by the baseband processing unit into a first analog signal including a reference clock signal and a common radio interface signal and transmit the first analog signal to the second repair unit through the cascade link; the second repair unit is used for sending a second analog signal carrying uplink data to the baseband processing unit through the first radio remote unit; the second repair unit is configured to recover the reference clock signal from the first analog signal, synchronize with the second remote radio unit according to the reference clock signal, convert a common wireless interface signal in the first analog signal into an optical signal, and transmit the optical signal to the second remote radio unit; and the optical signal carrying uplink data and sent by the second remote radio unit is converted into the second analog signal and is transmitted to the first repair unit through the cascade link.

Optionally, the first repair unit is powered by an external power source or the first remote radio unit, and maintains a working state;

the second repair unit is powered by an external power supply or the second remote radio unit and keeps working state.

Optionally, the baseband processing unit is configured to monitor whether a connection between the first radio frequency unit group and the second radio frequency unit group is abnormal, and notify the first remote radio unit to start a cascade mode if the connection between the first remote radio unit group and the second radio frequency unit group is abnormal;

the first remote radio unit is configured to start a cascade mode according to the notification of the baseband processing unit, so that the first radio unit group and the second radio unit group form the cascade link.

Optionally, the first repair unit is connected to a power switch provided by the first remote radio unit, and is powered on to enter a working state after the power switch is turned on by the first remote radio unit;

the second repair unit is connected with a power switch provided by the first remote radio unit, and the second remote radio unit is powered on to enter a working state after the power switch is turned on.

Optionally, the baseband processing unit is configured to monitor whether a connection between the first radio frequency unit group and the second radio frequency unit group is abnormal, and notify the first remote radio unit to start a cascade mode if the connection between the first remote radio unit group and the second radio frequency unit group is determined to be abnormal;

the second remote radio unit is used for turning on the power switch to enable the second repair unit to be powered on to enter a working state when the abnormal connection between the second remote radio unit and the baseband processing unit is determined; and the first remote radio unit is configured to start a cascade mode according to the notification of the baseband processing unit, so that the first radio unit group and the second radio unit group form the cascade link.

Optionally, the distributed base station further includes a third radio frequency unit group, where the third radio frequency unit group and the second radio frequency unit group are in an adjacent relationship;

the baseband processing unit is configured to notify the first remote radio unit of starting a cascade mode, and specifically includes:

the baseband processing unit selects from the first radio frequency unit group and the third radio frequency unit group and notifies the first remote radio unit to start a cascade mode.

Optionally, the first repair unit includes a first low frequency module, and the first low frequency module includes a first digital processing sub-module, a first analog processing sub-module, a first clock sub-module, and a first power supply sub-module, which are electrically connected to each other; the first digital processing sub-module is electrically connected with the optical port of the first low-frequency module, the first analog processing sub-module is electrically connected with the antenna feed interface of the first low-frequency module, and the first power supply sub-module is electrically connected with the power supply port of the first low-frequency module;

each sub-module of the first low-frequency module is configured to, when the connection between the second remote radio unit and the baseband processing unit is abnormal,

the first digital processing sub-module is configured to receive, through an optical port, an optical signal carrying downlink data sent by the baseband processing unit, demodulate two paths of digital signals respectively including the reference clock signal and a common wireless interface signal, combine carriers, and transmit the combined signals to the first analog processing sub-module; the public wireless interface signal used for transmitting the first analog processing submodule to the digital processing submodule is modulated into a digital signal and is sent through an optical port;

the first analog processing submodule is used for modulating and amplifying the signal transmitted by the first digital processing submodule to obtain the first analog signal, and transmitting the first analog signal through an antenna feeder interface; the second analog signal is used for being received through the antenna feeder interface, a public wireless interface signal is separated from the second analog signal and is transmitted to the first digital processing sub-module;

the first clock submodule is used for providing clock signals for the first digital processing submodule and the first analog processing submodule;

the first power supply submodule is used for supplying power to the first digital processing submodule, the first analog processing submodule and the first clock submodule.

Optionally, the second repair unit includes a second low-frequency module, and the second low-frequency module includes a second digital processing sub-module, a second analog processing sub-module, a second clock sub-module, and a second power supply sub-module, which are electrically connected to each other; the second digital processing sub-module is electrically connected with the optical port of the second low-frequency module, the second analog processing sub-module is electrically connected with the antenna feed interface of the second low-frequency module, and the second power supply sub-module is electrically connected with the power supply port of the second low-frequency module;

each sub-module of the second low-frequency module is configured to, when the connection between the second remote radio unit and the baseband processing unit is abnormal,

the second analog processing sub-module is configured to recover the reference clock signal from the first analog signal received through the antenna feeder interface, synchronize with the second radio remote unit according to the reference clock signal, and transmit a common wireless interface signal in the first analog signal to the second digital processing sub-module; the second analog signal is obtained by modulating and amplifying the digital signal transmitted by the second digital processing submodule and is sent through an antenna feeder interface;

the second digital processing submodule is used for modulating the public wireless interface signal transmitted by the second analog processing submodule into a digital signal and transmitting the digital signal through an optical port; the optical interface is used for receiving an optical signal carrying uplink data from the first analog processing submodule;

the second clock submodule is used for providing clock signals for the second digital processing submodule and the second analog processing submodule;

the second power supply submodule is used for supplying power to the second digital processing submodule, the second analog processing submodule and the second clock submodule.

Optionally, the first analog signal and the second analog signal are intermediate frequency module signals or low frequency analog signals.

Optionally, the first connector and the second connector include a multi-system access platform, and the multi-system access platform includes a duplexer;

two signal source ports of the duplexer of the first connector are respectively connected with the first repairing unit and the antenna feeder interface of the first radio remote unit;

and two signal source ports of the duplexer of the second connector are respectively connected with the second repairing unit and the antenna feeder interface of the first radio remote unit.

In the distributed base station provided in the embodiment of the present disclosure, when a connection between the baseband processing unit and the second remote radio unit is abnormal, the first radio unit group and the second radio unit group may form the cascade link, and the first repair unit and the second repair unit enable the baseband processing unit and the second remote radio unit to maintain communication and exchange data, for example, downlink data sent by the baseband processing unit and uplink data sent by the second remote radio unit may be exchanged through participation of the first repair unit and the second repair unit, so as to ensure normal operation of the distributed base station under the condition of abnormal connection between the baseband processing unit and the second remote radio unit.

In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a star-type networking in a distributed base station networking in the prior art;

fig. 2 is a schematic diagram of a first connection structure between a baseband processing unit and a remote radio unit in the prior art;

fig. 3 is a schematic diagram of a second connection structure between a baseband processing unit and a remote radio unit in the prior art;

fig. 4 is a schematic diagram of a first structure of a distributed base station according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a first low frequency module according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a second low frequency module provided in the embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a connector provided in an embodiment of the present disclosure;

fig. 8 is another schematic structural diagram of a distributed base station according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a radio frequency unit group according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a specific distributed base station according to an embodiment of the present disclosure.

Detailed Description

The embodiment of the disclosure provides a distributed base station and a fault processing method thereof, so as to ensure that the distributed base station can work normally when the connection between a baseband processing unit and a radio remote unit is abnormal. In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, the present disclosure is described in further detail with reference to the accompanying drawings and the detailed description.

The embodiment of the present disclosure provides a distributed base station, as shown in fig. 4, including a baseband processing unit 10, and further including at least a first radio frequency unit group 21 and a second radio frequency unit group 22, where the baseband processing unit 10, the first radio frequency unit group 21 and the second radio frequency unit group 22 are in a star-type networking;

the first radio frequency unit group 21 includes a first radio frequency remote unit 211, a first connector 213, and a first repair unit 212, an antenna feed interface of the first radio frequency remote unit 211 is connected to an information source port of the first connector 213, the first radio frequency unit group 21 is connected to the baseband processing unit 10 through a first optical port of the first radio frequency remote unit 211, and the first repair unit 212 is connected between a second optical port of the first radio frequency remote unit 211 and an information source port of the first connector 213.

The second radio frequency unit group 22 includes a second radio frequency remote unit 221, a second connector 223 and a second repair unit 222, an antenna feed interface of the second radio frequency remote unit 221 is connected to an information source port of the second connector 223, the second radio frequency unit group 22 is connected to the baseband processing unit 10 through a first optical port of the second radio frequency remote unit 221, and the second repair unit 222 is connected between a second optical port of the second radio frequency remote unit 221 and an information source port of the second connector 223.

The first connector 213 of the first rf unit group 21 is connected to the second connector 223 of the second rf unit group 22 through a leaky cable.

When the second remote radio unit 221 is abnormally connected to the baseband processing unit 10, the first radio unit group 21 and the second radio unit group 22 form a cascade link, and the first repair unit 212 is configured to modulate an optical signal carrying downlink data sent by the baseband processing unit 10 into a first analog signal including a reference clock signal and a common radio interface signal, and transmit the first analog signal to the second repair unit 222 through the cascade link; and is configured to convert the second analog signal carrying the uplink data sent back by the second repair unit 222 into an optical signal, and send the optical signal to the baseband processing unit 10 through the first remote radio unit 211; a second repair unit 222, configured to recover the reference clock signal from the first analog signal, synchronize with the second remote radio unit 221 according to the reference clock signal, convert the common wireless interface signal in the first analog signal into an optical signal, and transmit the optical signal to the second remote radio unit 221; and is configured to convert the optical signal carrying the uplink data sent by the second remote radio unit 221 into a second analog signal, and transmit the second analog signal to the first repair unit 212 through the cascade link.

In a specific implementation, when a connection abnormality occurs in the optical fiber between the baseband processing unit 10 and the second remote radio unit 221 in some cases, for example, the optical fiber is broken or damaged due to external damage, so that the connection is interrupted or is very unstable. This may result in that the baseband processing unit 10 and the second remote rf unit 221 cannot communicate with each other, and therefore, this situation needs to be repaired. The baseband processing unit 10 may monitor the connection with the first remote radio unit 211 and the second remote radio unit 221 in real time, and if the baseband processing unit 10 monitors that the connection with the second remote radio unit 221 is abnormal, the baseband processing unit 10 informs the first remote radio unit 211 to start the cascade mode, so that the first rf unit group 21 and the second rf unit group 22 form a cascade link, thereby implementing the communication between the baseband processing unit 10 and the second remote rf unit 221 of the second rf unit group 22, that is, the baseband processing unit 10 communicates with the second radio remote unit 221 through the first radio remote unit 211, the first repair unit 212, the first connector 213, the leaky cable, the second connector 223 and the second repair unit 222, that is, the baseband processing unit 10 communicates with the second remote rf unit 221 through the cascade link formed by the first rf unit group 21 and the second rf unit group 22.

In the embodiment of the present disclosure, the first repairing unit 212 and the second repairing unit 222 may adopt various power supply methods, for example, as follows:

the first repair unit 212 is powered by an external power supply or the first remote radio unit 211, and keeps working; the second repair unit 222 is powered by an external power source or the second remote radio unit 221, and maintains an operating state. On this basis, the baseband processing unit 10 monitors whether the connection between the first radio frequency unit group 21 and the second radio frequency unit group 22 is abnormal, and if the connection between the first radio frequency unit group 21 and the second radio frequency unit group 22 is abnormal, notifies the first remote radio unit 211 to start the cascade mode; the first remote radio unit 211 starts the cascade mode according to the notification of the baseband processing unit 10, so that the first radio unit group 21 and the second radio unit group 22 form a cascade link. Since both the first repair unit 212 and the second repair unit 222 remain in an operating state, it is possible to respond to the repair communication request more quickly.

The power supply can also be applied in the following way, for example:

the first repair unit 212 is connected to a power switch provided by the first remote radio unit 211, and is powered on to enter a working state after the first remote radio unit 211 turns on the power switch; the second repair unit 222 is connected to a power switch provided by the first remote radio unit 211, and is powered on to enter a working state after the second remote radio unit 221 turns on the power switch. On this basis, the baseband processing unit 10 is configured to monitor whether the connection between the first radio frequency unit group 21 and the second radio frequency unit group 22 is abnormal, and notify the first remote radio unit 211 to start the cascade mode if it is determined that the connection between the first remote radio unit group 21 and the second radio frequency unit group 22 is abnormal; the second remote radio unit 221, configured to turn on a power switch to power on the second repair unit 222 to enter a working state when it is determined that the connection with the baseband processing unit 10 is abnormal; and the first remote radio unit 211 is configured to turn on a power switch according to the notification of the baseband processing unit 10 to enable the first repair unit 212 to be powered on to enter a working state, and start a cascade mode, so that the first radio unit group 21 and the second radio unit group 22 form a cascade link. When the distributed base station is normal, the first repair unit 212 and the second repair unit 222 are not started, so that power consumption can be reduced, and the service life can be prolonged.

It should be noted that the distributed base station may further include other radio frequency unit groups besides the first radio frequency unit group 21 and the second radio frequency unit group 22, for example, the distributed base station further includes a third radio frequency unit and a fourth radio frequency unit group (not shown).

It is assumed that the first group of radio frequency units 21 and the third group of radio frequency units are in adjacent relationship with the second group of radio frequency units 22. That is, when viewed from the end of the leaky cable, the first connector of the first radio frequency unit group 21 is directly connected to the second connector of the second radio frequency unit group 22 through the leaky cable, and no other radio frequency unit group is connected to the leaky cable therebetween; the connector of the third rf unit set is directly connected to the second connector of the second rf unit set 22 through a leaky cable, and no other rf unit set is connected therebetween. The informing, by the baseband processing unit 10, of the start of the cascade mode with the first remote radio unit may specifically include: the baseband processing unit 10 selects the first radio frequency unit group 21 from the first radio frequency unit group 21 and the third radio frequency unit group, and notifies the first remote radio frequency unit 211 of the first radio frequency unit group 21 to start the cascade mode. It should be noted that if the remote radio unit of the third radio unit group is closer to the second remote radio unit 221 of the second radio unit group 22, the baseband processing unit 10 selects the third radio unit group, and the working principle of the third radio unit group is the same as that of the first radio unit group 21, which is not described again. Obviously, the baseband processing unit 10 may select one remote radio unit to perform communication repair on the remote radio unit with abnormal connection according to the proximity relationship between the remote radio units, so as to improve the quality of mutual communication.

The first repair unit 212 and the second repair unit 222 of the embodiment of the present disclosure may be composed of, for example: the first repair unit 212 includes a first low frequency module, as shown in fig. 5, which shows a schematic structural diagram of the first low frequency module, including a first digital processing sub-module 2121, a first analog processing sub-module 2122, a first clock sub-module 2123, and a first power sub-module 2124, which are electrically connected to each other; the first digital processing sub-module 2121 is electrically connected to the optical port of the first low-frequency module, the first analog processing sub-module 2122 is electrically connected to the antenna feed interface of the first low-frequency module, and the first power sub-module 2124 is electrically connected to the power port of the first low-frequency module;

each sub-module of the first low-frequency module, when the second remote radio unit 221 is abnormally connected to the baseband processing unit 10, is configured to demodulate, by carrier-combining, two paths of digital signals, which respectively include a reference clock signal and a common radio interface signal, from the optical signal carrying downlink data sent by the baseband processing unit 10 through the optical port, and transmit the demodulated digital signals to the first analog processing sub-module 2122; the public wireless interface signal which is transmitted to the digital processing submodule by the first analog processing submodule 2122 is modulated into a digital signal and is sent through an optical port;

the first analog processing submodule 2122 is configured to modulate and amplify a signal transmitted by the first digital processing submodule 2121 to obtain a first analog signal, and send the first analog signal through the antenna feeder interface; and a public wireless interface signal is separated from the second analog signal received through the antenna feeder interface and transmitted to the first digital processing submodule 2121;

a first clock submodule 2123 for providing a clock signal to the first digital processing submodule 2121 and the first analog processing submodule 2122;

a first power supply submodule 2124 for supplying power to the first digital processing submodule 2121, the first analog processing submodule 2122 and the first clock submodule 2123.

Similarly, the second repair unit 222 includes a second low frequency module, as shown in fig. 6, which is a schematic structural diagram of the second low frequency module, and includes a second digital processing sub-module 2221, a second analog processing sub-module 2222, a second clock sub-module 2223, and a second power sub-module 2224, which are electrically connected to each other; the second digital processing sub-module 2221 is electrically connected to the optical port of the second low-frequency module, the second analog processing sub-module 2222 is electrically connected to the antenna feed interface of the second low-frequency module, and the second power sub-module 2224 is electrically connected to the power port of the second low-frequency module;

each sub-module of the second repair unit 222, when the connection between the second radio remote unit 221 and the baseband processing unit 10 is abnormal, is configured to recover the reference clock signal from the first analog signal received through the antenna feed interface, synchronize with the second radio remote unit 221 according to the reference clock signal, and transmit the common wireless interface signal in the first analog signal to the second digital processing sub-module 2221; and, the second analog signal is obtained by modulating and amplifying the digital signal transmitted by the second digital processing sub-module 2221, and is sent through the antenna feeder interface;

a second digital processing submodule 2221, configured to modulate the public wireless interface signal transmitted by the second analog processing submodule 2222 into a digital signal and send the digital signal through an optical port; and, configured to modulate the optical signal carrying the uplink data received through the optical port into a digital signal and transmit the digital signal to the second analog processing sub-module 2222;

a second clock submodule 2223, configured to provide a clock signal for the second digital processing submodule 2221 and the second analog processing submodule 2222;

and a second power supply sub-module 2224 for supplying power to the second digital processing sub-module 2221, the second analog processing sub-module 2222, and the second clock sub-module 2223.

Based on the above description of the first and second low frequency modules, the first and second analog signals may be intermediate frequency analog signals or low frequency analog signals.

In the embodiment of the present disclosure, the first connector 213 and the second connector 223 may include a multi-system access platform, which includes a duplexer; two signal source ports of the duplexer of the first connector 213 are respectively connected to the first repairing unit 212 and the antenna feeder interface of the first remote radio unit 211;

two source ports of the duplexer of the second connector 223 are respectively connected to the second repairing unit 222 and the antenna feeder interface of the first remote radio unit 211.

The first connector 213 and the second connector 223 may have the same structure as shown in fig. 7, including a duplexer and a filter, and of course, a microstrip antenna (not shown), and have a plurality of outlets to the outside, such as source ports ANT0, ANT1, ANT2, ANT3, and ANT4, and common ports ANT1 ', ANT 2', ANT3 ', and ANT 4'. The source port ANT0 is connected to the antenna feeder interfaces of the repair unit, and ANT1, ANT2, ANT3, and ANT4 are respectively connected to 4 antenna feeder interfaces of the remote radio units (e.g., the first remote radio unit 211 and the second remote radio unit 221 shown in fig. 4); ANT1 ', ANT 2', ANT3 'and ANT 4' are connected to the leaky cable, respectively. It should be noted that the structures of the first connector 213 and the second connector 223 in the embodiment of the disclosure are only for illustration, the disclosure is not limited thereto, and other structures that meet the requirements of the disclosure may be adopted, and are not described herein again.

In the embodiment of the present disclosure, the first radio frequency unit group 21 and the second radio frequency unit group 22 may be understood as having the same structure and/or function, and similarly, the first radio frequency unit 211 and the second radio frequency unit 221, the first repair unit 212 and the second repair unit 222, and the first connector 213 and the second connector 223 may also be understood as having the same structure and/or function, which are only distinguished for convenience of description and are not limited to the present disclosure, and are not described herein again.

In the distributed base station provided in the embodiment of the present disclosure, when a connection between the baseband processing unit 10 and the second remote radio unit 22 is abnormal, the first radio unit group 21 and the second radio unit group 22 may form a cascade link, and the first repair unit 212 and the second repair unit 222 enable the baseband processing unit 10 and the second remote radio unit 22 to maintain communication and exchange data, for example, downlink data sent by the baseband processing unit 10 and uplink data sent by the second remote radio unit 221 may interact with each other through participation of the first repair unit 212 and the second repair unit 222, so as to ensure normal operation of the distributed base station under the condition that the connection between the baseband processing unit 10 and the second remote radio unit 21 is abnormal.

It should be noted that the distributed base station provided in the embodiment of the present disclosure may obviously include multiple radio frequency unit groups, and is not limited to the first radio frequency unit group 21 and the second radio frequency unit group 22 shown in fig. 4. The distributed base station includes a plurality of combined radio frequency unit groups, which is described below with reference to the structural schematic diagram of the distributed base station shown in fig. 8, and includes one baseband processing unit 10 and at least two radio frequency unit groups 20 of a star-type network. As shown in fig. 9, each radio frequency unit group 20 includes a remote radio unit 201, a connector 202, and a repair unit 203; in the same radio frequency unit group 20, the antenna feed interface of the radio frequency remote unit 201 is connected with the information source port of the connector 122, and the repair unit 203 is connected between the optical port of the radio frequency remote unit 201 and the information source port of the connector 202; the common ports of the connectors 202 of two adjacent groups 20 of radio frequency units are connected by a leaky cable. In the distributed base station shown in the figure, the remote radio unit 201 may have at least two optical ports, and the remote radio unit 201 is connected to the optical port of the repair unit 203 through one optical port and is connected to the baseband processing unit through another optical port.

The repair unit 203 is configured to, when a connection between the radio remote unit 201 of any radio unit group 20 and the baseband processing unit 10 is abnormal, enable one radio remote unit 20 that is normally connected and the radio unit group 20 that is abnormally connected to form a cascade link, enable the radio remote unit 201 of the radio unit group 20 that is abnormally connected to receive and process downlink data sent by the baseband processing unit 10 through the cascade link, and enable uplink data sent by the radio remote unit 201 of the radio unit group 20 that is abnormally connected to be transmitted to the baseband processing unit 10 through the cascade link.

In a specific implementation, the connection between the baseband processing unit 10 and the remote radio unit 201 is interrupted or is very unstable due to a connection abnormality occurring in the optical fiber in some cases, for example, the optical fiber is broken or damaged due to external damage. In this case, communication between the baseband processing unit 10 and the radio remote unit 201 with abnormal connection is disabled, and therefore, it is necessary to repair such a situation. The baseband processing unit 10 may monitor whether the connection between the baseband processing unit 10 and the remote radio units 201 of each remote radio unit group 20 is abnormal in real time, and if the baseband processing unit 10 monitors that the connection with one remote radio unit 201 is abnormal, for example, the connection is interrupted or is very unstable, the baseband processing unit 10 notifies one radio unit group 20 that is adjacent to the radio unit group 20 with the abnormal connection and is normally connected to start a cascade mode, so that the radio unit group 20 with the normal connection and the radio unit group 20 with the abnormal connection form a cascade link, thereby implementing communication between the baseband processing unit 10 and the remote radio unit 201 of the radio unit group 20 with the abnormal connection. Of course, for the case that the connection between the baseband processing unit 10 and the plurality of remote radio units 201 is abnormal, it is necessary to consider whether there is a collision between the plurality of cascaded links, and perform corresponding adjustment when there is a collision.

In the distributed base station provided in the embodiment of the present disclosure, when abnormal connection occurs between the baseband processing unit 10 and the remote radio unit 201, the repair unit 203 included in the radio frequency unit group 20 can enable the normally connected radio frequency unit group 20 and the abnormally connected radio frequency unit group 20 to form a cascade link through a leaky cable, and the related repair unit 203 included in the cascade link enables data interaction between the baseband processing unit 10 and the remote radio unit 201 in the abnormally connected radio frequency unit group 20, for example, downlink data sent by the baseband processing unit 10 and uplink data sent by the remote radio unit 201 in the abnormally connected radio frequency unit group 20, so as to ensure that the distributed base station can normally operate under the condition that abnormal connection occurs between the baseband processing unit 10 and the remote radio unit 201.

In this embodiment, still according to the specific application of the repair unit 203 by the distributed base station shown in fig. 8, when there is an abnormal connection between the baseband processing unit 10 and the radio frequency pulling unit 201 in the distributed base station during implementation, the repair unit 203 may operate in the following processing manner (of course, the repair unit 203 is already in an operating state at this time):

a repair unit 203 connected to the normal radio frequency unit group 20 (a selected radio frequency unit group in the start cascade mode), which modulates the optical signal carrying the downlink data sent by the baseband processing unit 10 into a first analog signal including a reference clock signal and a common radio interface signal, and transmits the first analog signal to the repair unit 203 connected to the radio frequency unit group 20 in the abnormal state through a cascade link; and a second analog signal carrying uplink data and sent back by the repair unit 203 of the radio frequency unit group 20 with abnormal connection is received and converted into an optical signal, and the optical signal is sent to the baseband processing unit 10 through the radio remote unit 201 of the radio frequency unit group 20;

the repair unit 203 connected to the abnormal radio frequency unit group 20 is configured to recover a reference clock signal according to the first analog signal, synchronize with the remote radio frequency unit 201 of the group according to the reference clock signal, convert a common wireless interface signal in the first analog signal into an optical signal, and transmit the optical signal to the remote radio frequency unit 201 of the group; and a repair unit 203 for converting the optical signal carrying the uplink data sent by the remote radio unit 201 into a second analog signal, and transmitting the second analog signal to the radio unit group 20 connected normally through the cascade link.

In the distributed base station provided in the embodiment of the present disclosure, when a connection between the baseband processing unit 10 and the radio remote unit 201 is abnormal, the repair unit 203 connected to the normal radio unit group 20 can recover a parameter clock signal used for synchronizing the radio remote unit 201 and the repair unit 203 connected to the abnormal radio unit group 20, and after the cascade link is formed by the normal radio unit group 20 and the abnormal radio unit group 20, the relevant repair unit 203 included in the cascade link can process or transmit a received signal or data, so that data can be exchanged between the baseband processing unit 10 and the radio remote unit 201 in the abnormal radio unit group 20, and normal operation of the distributed base station under the abnormal connection condition between the baseband processing unit 10 and the radio remote unit 201 is ensured.

It should be noted that, for the radio frequency unit group 20 shown in fig. 9, the repair unit 203 may be powered in various ways, for example: the repair unit 203 is powered by an external power supply or the radio remote units 201 in the same group, and keeps working state; alternatively, the repair unit 203 may be connected to a power switch provided by the same group of remote radio units 201, and power up to enter the operating state after the same group of remote radio units 201 turn on the power switch. Different power supply modes can enable the deployment of the distributed base station to be more flexible, and corresponding adjustment can be carried out based on different purposes. The disclosed embodiments are not limited to the above-described case of supplying power to the repair unit 203, but are for illustration only.

In the different situations of supplying power to the repair unit 203 described above with reference to fig. 8 and 9, the embodiments of the parts are described as follows:

for the case that the repair unit 203 is powered by an external power source or powered by the same group of remote radio units 201 and keeps working: the baseband processing unit 10 monitors whether the connection between the radio frequency unit groups 20 is abnormal, and if the connection between the baseband processing unit 10 and any radio frequency unit group 20 is abnormal, notifies a radio remote unit 201 which is adjacent to the radio frequency unit group 20 with abnormal connection and is connected to the radio frequency unit group 20 with normal connection to start the cascade mode. At this time, the notified radio remote unit 201 connected to the normal radio unit group 20 can start the cascade mode according to the notification of the baseband processing unit 10, so that the located radio unit group 20 and the radio unit group 20 with abnormal connection form a cascade link.

For the situation that the repair unit 203 is connected to the power switch provided by the remote radio units 201 in the same group, and the remote radio units 201 in the same group are powered on to enter the working state after the power switch is turned on: the baseband processing unit 10 monitors whether the connection between the baseband processing unit and each radio frequency unit group 20 is abnormal, determines that the connection between the baseband processing unit and any radio frequency unit group 20 is abnormal if the connection between the baseband processing unit and any radio frequency unit group 20 is detected to be abnormal and the connection between the baseband processing unit and any radio frequency unit group 20 is still abnormal after waiting for a preset time, and notifies a radio remote unit 201 which is adjacent to the radio frequency unit group 20 with the abnormal connection and is connected with the normal radio frequency unit group 20 to start a cascade mode; when determining that the connection between the remote radio unit 201 of each radio unit group 20 and the baseband processing unit 10 is abnormal, turning on a power switch to power on the repair unit 203 of the same group to enter a working state; the notified radio remote unit 201 connected to the normal radio frequency unit group 20 starts the cascade mode according to the notification of the baseband processing unit 10, so that the located radio frequency unit group 20 and the radio frequency unit group 20 connected abnormally form a cascade link.

In order to understand the distributed base station provided in the embodiment of the present disclosure in more detail, a structural schematic diagram of the distributed base station as shown in fig. 10 is provided, and a repair unit 203 is described, where fig. 10 only illustrates two radio frequency unit groups 20, but a plurality of radio frequency unit groups 20 still conform to the description of the embodiment of the present disclosure, and the description is as follows:

the distributed base station comprises a baseband processing unit 10 (such as BBU in fig. 10); the two radio unit groups 20 respectively include the radio remote units 201 (e.g., RRU1 and RRU2 in fig. 10), the connectors 202 (e.g., POI1 and POI2 in fig. 10), and the repair units 1 and 2.

Taking the abnormal connection between the BBU and the RRU2 as an example for explanation, the two radio frequency unit groups 20 form a cascade link, and a specific route for transmitting downlink data can refer to the first route 30; the repair unit 1 modulates the optical signal carrying the downlink data sent by the BBU into an analog signal, transmits the analog signal to the repair unit 2 through the first route 30, the repair unit 2 converts the received analog signal carrying the downlink data into an optical signal, and transmits the optical signal to the RRU2 through the first route 30, so that the downlink data sent by the BBU is normally received, and the RRU2 processes the downlink data.

On the contrary, along the reverse direction of the first route 20, the repair unit 2 converts the optical signal carrying the uplink data sent by the RRU2 into an analog signal and transmits the analog signal to the repair unit 1, and the repair unit 1 receives the analog signal carrying the uplink data and converts the analog signal into an optical signal and sends the optical signal to the baseband processing unit 10, so that the uplink data sent by the RRU2 normally reaches the BBU.

In the embodiment of the present disclosure, the downlink data and the uplink data may each include a Common Public Radio Interface (CPRI) signal, where the CPRI signal includes frequency, phase, complex data, control information, and the like, such as a synchronization signal, IQ data, C & M information, OM information, and the like.

In order to keep the repair unit 1 or the repair unit 2 in a stable operating state during operation, it may be necessary to provide a reference clock signal to the repair unit 1 or the repair unit 2 to synchronize the repair unit 1 and the RRU1 and the repair unit 2 and the RRU 2. In the distributed base station shown in fig. 10 according to the embodiment of the present disclosure, after the BBU and the RRU2 are abnormally connected and the repair unit 1 or the repair unit 2 has been initialized, the repair unit 1 connected to the normal radio frequency unit group 20 may recover the optical signal carrying the downlink data sent to the RRU2 by the BBU to obtain a single tone signal, where the single tone signal is used for synchronizing the repair unit 2 and the RRU2, the single tone signal may be sent to the repair unit 2 separately, or may be combined with a CPRI signal that needs to be transparently transmitted in the downlink data and then sent to the repair unit 2, and the repair unit 2 parses the single tone signal, uses the single tone signal as a working reference clock signal, and transparently transmits the CPRI signal to the RRU 2. Of course, the repair unit 1 may also use the same or similar tone signal sent by the RRU1 as a reference clock signal, which is not described herein.

The recovery process of a specific single-tone signal may be slightly different according to the different structures of the repair unit 1 and the repair unit 2, but the recovery of the single-tone signal may be considered to be suitable for the synchronization of the repair unit 1 and the repair unit 2 in the embodiment of the present disclosure.

Still referring to fig. 10, taking the repair unit 1 and the repair unit 2 including a serializer/decoder (de-decoders), a Field Programmable Gate Array (FPGA), a Digital Up Converter (DUC), a Direct Digital frequency Synthesizer (DDS), a carrier combiner, and a Digital-to-analog converter as an example, the repair unit 1 modulates the optical signal carrying the downlink data sent by the baseband processing unit 10 into a first analog signal including a reference clock signal and a common wireless interface signal, as follows:

when the connection between the BBU and the RRU2 is abnormal, an optical signal (downlink data including a CPRI signal) carrying downlink data sent by the BBU is divided into two paths for processing after passing through de-stages of the repair unit 1, the CPRI signal is processed through a first path, a synchronization bit is inserted and bit code mapping is carried out, and then a first path of signal is obtained by processing through a first DUC; the CPRI signal is processed by the second path, the recovered clock signal is debounced by an external Phase Locked Loop (PLL), and then a single-tone signal is generated by the DDS, and the single-tone signal is processed by the second DUC to obtain the second path of signal. And the first path of signal and the second path of signal are subjected to carrier combination by the carrier combiner and then are transmitted to the DAC for analog modulation and amplification, and then analog signals are output, wherein the analog signals output by the DAC are used as the inlet signals of the POI 1. The repair unit 2 receives the analog signal through the POI2, demodulates and amplifies the analog signal, recovers the single-tone signal, uses the single-tone signal as a reference clock signal, converts the analog signal into an optical signal, and transmits the optical signal to the RRU2, and the repair unit 2 uses the single-tone signal as the reference clock signal to synchronize with the RRU 2. The reverse principle is the same and is not described in detail herein.

The following describes in detail the situation of different modes of power supply for the repair unit 1 and the repair unit 2 with reference to fig. 10:

when the repair unit 1 and the repair unit 2 are powered by an external power supply, or the repair unit 1 is powered by the RRU1, the repair unit 2 is powered by the RRU2, and the repair unit 1 and the repair unit 2 are always in a working state, the BBU monitors whether the connection between the BBU1 and the RRU2 is abnormal, taking the abnormal connection between the BBU and the RRU2 as an example, and at this time, the BBU notifies the RRU1 to start a cascade mode; the RRU1 starts the cascade mode according to the notification of the BBU, so that the located radio frequency unit group 20 and the radio frequency unit group 20 with abnormal connection form a cascade link. Since the repair unit 1 and the repair unit 2 are already in the working state, BBU does not need to consider waiting for the startup of the repair unit 1 and the repair unit 2, and can respond more quickly. The BBU can directly send downlink data required by the RRU2, that is, send an optical signal carrying the downlink data, the repair unit 1 modulates the optical signal carrying the downlink data sent by the BBU into an analog signal, transmits the analog signal carrying the downlink data to the repair unit 2 along the first route 30, the repair unit 2 converts the received analog signal carrying the downlink data into an optical signal, and continues to transmit the optical signal to the RRU2 along the first route 30, and the RRU2 continues to transmit the optical signal to the leaky cable along the first route 30 according to the data sent after processing the optical signal, so that the RRU2 can normally receive and process the downlink data sent by the BBU.

When the power switch of the repair unit 1 and the power switch of the RRU1 supply power, the repair unit 2 is connected with the RRU2 power switch, and the repair unit 1 and the repair unit 2 need to be started, the BBU monitors whether the connection between the BBU and the RRU1 and the RRU2 is abnormal, taking the abnormal connection between the BBU and the RRU2 as an example, the BBU waits for a predetermined time, so that the RRU2 starts 2 when the abnormal connection is determined by itself, and the repair unit 2 completes initialization loading. Of course, in this process, the BBU may notify the RRU1 to start the repair unit 1, or the BBU may notify the RRU1 to start the repair unit 1 when the cascade mode is started after the predetermined time. The RRU1 starts the cascade mode according to the notification of the BBU1, so that the located radio frequency unit group 20 and the radio frequency unit group 20 with abnormal connection form a cascade link. Then the BBU sends an optical signal carrying downlink data, the repair unit 1 modulates the optical signal carrying the downlink data sent by the BBU into an analog signal, the analog signal carrying the downlink data is transmitted to the repair unit 2 along the first route 30, the repair unit 2 converts the received analog signal carrying the downlink data into an optical signal, the optical signal is continuously transmitted to the RRU2 along the first route 30, the RRU2 continuously transmits the optical signal to the leaky cable along the first route 30 according to the data sent after the optical signal is processed, and normal receiving and processing of the downlink data sent by the BBU by the RRU2 are achieved. Since the repair unit 1 and the repair unit 2 need to be initially loaded, the BBUs need to wait for the repair unit 1 and the repair unit 2 to start up and to be initially loaded. Correspondingly, when the BBU and the RRU1 are normally connected and the repair unit 2 is normally connected with the RRU2, the repair unit 1 and the repair unit 2 may not enter a working state, which can reduce energy consumption.

In the embodiments provided in the present disclosure, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments provided in the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are merely specific embodiments of the present disclosure, which are used for illustrating the technical solutions of the present disclosure and not for limiting the same, and the scope of the present disclosure is not limited thereto, and although the present disclosure is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive of the technical solutions described in the foregoing embodiments or equivalent technical features thereof within the technical scope of the present disclosure; such modifications, changes, or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A distributed base station is characterized by comprising a baseband processing unit, a first radio frequency unit group and a second radio frequency unit group, wherein the baseband processing unit is in star-shaped networking with the first radio frequency unit group and the second radio frequency unit group;

2. The distributed base station of claim 1, wherein the first repair unit is powered by an external power source or the first remote radio unit and remains operational;

3. The distributed base station of claim 2, wherein the baseband processing unit is configured to monitor whether a connection between the first radio frequency unit group and the second radio frequency unit group is abnormal, and notify the first radio remote unit to start a cascade mode if the connection between the first radio frequency unit group and the second radio frequency unit group is abnormal;

4. The distributed base station of claim 1, wherein the first repair unit is connected to a power switch provided by the first remote radio unit, and is powered on to enter a working state after the power switch is turned on by the first remote radio unit;

5. The distributed base station of claim 4, wherein the baseband processing unit is configured to monitor whether a connection between the first radio frequency unit group and the second radio frequency unit group is abnormal, and notify the first radio remote unit to start a cascade mode if it is determined that the connection between the first radio frequency unit group and the second radio frequency unit group is abnormal;

the second remote radio unit is used for turning on the power switch to enable the second repair unit to be powered on to enter a working state when the abnormal connection between the second remote radio unit and the baseband processing unit is determined; and the number of the first and second groups,

6. The distributed base station of claim 3 or 5, wherein the distributed base station further comprises a third group of radio frequency units, the first group of radio frequency units and the third group of radio frequency units being in a neighboring relationship with the second group of radio frequency units;

7. The distributed base station of claim 1, wherein the first repair unit comprises a first low frequency module comprising a first digital processing sub-module, a first analog processing sub-module, a first clock sub-module, and a first power sub-module electrically connected to each other; the first digital processing sub-module is electrically connected with the optical port of the first low-frequency module, the first analog processing sub-module is electrically connected with the antenna feed interface of the first low-frequency module, and the first power supply sub-module is electrically connected with the power supply port of the first low-frequency module;

8. The distributed base station of claim 7, wherein the second repair unit includes a second low frequency module including a second digital processing sub-module, a second analog processing sub-module, a second clock sub-module, and a second power sub-module electrically connected to each other; the second digital processing sub-module is electrically connected with the optical port of the second low-frequency module, the second analog processing sub-module is electrically connected with the antenna feed interface of the second low-frequency module, and the second power supply sub-module is electrically connected with the power supply port of the second low-frequency module;

9. The distributed base station of claim 7 or 8, wherein the first analog signal and the second analog signal are intermediate frequency analog signals or low frequency analog signals.

10. The distributed base station of claim 1, wherein the first connector and the second connector comprise a multi-system access platform, the multi-system access platform comprising a diplexer;