WO2014094473A1

WO2014094473A1 - Redundant hot backup method and system for base station radio frequency unit

Info

Publication number: WO2014094473A1
Application number: PCT/CN2013/083831
Authority: WO
Inventors: 李旭明; 李群生
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-12-19
Filing date: 2013-09-18
Publication date: 2014-06-26
Also published as: RU2015129007A; RU2611435C2; CN103888984A

Abstract

Disclosed are a redundant hot backup method and system for a base station radio frequency unit, which relate to a GSM-R of the wireless communication field. The method includes: directly connecting a main radio frequency unit and a secondary radio frequency unit in the mutual hot backup with one and the same baseband processing unit, and receiving one and the same downlink signal from the baseband processing unit; the main radio frequency unit performing radio frequency processing on the downlink signal to acquire a primary signal, and transmitting same via a primary transmitting antenna; and the secondary radio frequency unit performing time delay radio frequency processing on the downlink signal to acquire a time delay radio frequency signal, and transmitting same via a diversity transmitting antenna.By adopting two independent main and secondary radio frequency units, the invention can realize the hot backup of main and secondary functions without the need for time changeover.

Description

Method and system for redundant radio backup of base station radio frequency unit

The present invention relates to the field of wireless communications, and in particular, to a method and system for redundant hot backup of a base station radio frequency unit in the GSM-R field. Background technique

At present, the base station radio unit backup method mainly adopts a carrier frequency switching method, that is, when the normal working, the working carrier frequency works normally, and the backup carrier frequency does not work. As shown in Fig. 1, when the working carrier frequency of the main working base station 10 fails, the carrier frequency switching is performed, the working carrier frequency is turned off, and the backup carrier frequency of the backup base station 11 is turned on. Specifically, the primary radio unit of the primary working base station and the standby radio unit of the backup working base station are combined and output through the combiner 12. During normal operation, the primary radio unit transmits a signal, and the standby radio unit does not transmit a signal. When the main RF unit fails, the device needs to be switched. During the switching, neither RF unit transmits a signal, and the system works interrupted. After the switch is completed, the standby RF unit transmits a signal, and the main RF unit has no signal output. If two identical wireless signals are to be added and combined in the combiner, the corresponding phase adjustment technique must be used to add the two RF signals in the same phase in the combiner, but once one signal fails, this The added conditions are destroyed, and only half of the power of the normal wireless signal can be transmitted, which does not function as a backup.

If two identical RF signals are not directly transmitted to the same coverage area through the combiner, the two identical RF signals may have interference problems in the air, that is, in the normal coverage area, in some locations, the two signals are in phase. Adding, the signal is increased; in some positions, the two signals are added in reverse, and the signals are not pinned by each other, so the RF signals cannot be simultaneously transmitted.

In the prior art, switching a radio frequency signal by using a switching signal has problems such as a need for switching time, unsuccessful switching, and the like. In addition, with the switch, the backup circuit must be in the same way as the main working circuit. In the working device, there may be a problem that the public part of the device fails and the backup cannot be achieved.

When the GSM-R system is used for the control and dispatch of high-speed railways, the trouble-free operation of the GSM-R system is crucial to ensure the safe operation of the high-speed railway. Redundant backup of base station equipment is required. However, general redundancy backup requires equipment switching time and the radio part is in cold backup state. The general switching frequency takes a few seconds or even tens of seconds. During this time, the high-speed train running at 300 kilometers per hour has traveled several kilometers, but it may be out of control, so there is great security. Hidden dangers. On the other hand, the backup carrier frequency is normally off, and there may be a fault. When switching the carrier frequency, it actually does not function as a backup. Summary of the invention

The purpose of the embodiments of the present invention is to provide a method and system for redundant hot backup of a radio frequency unit of a base station, so that the radio units of two independent active and standby base station devices can implement hot backup of the active and standby functions without switching time.

According to an aspect of the embodiments of the present invention, a method for redundant hot backup of a base station radio frequency unit is provided, including:

The primary radio unit and the standby radio unit that are mutually hot backup are directly connected to the same baseband processing unit, and receive the same downlink signal from the baseband processing unit;

The main radio unit performs radio frequency processing on the downlink signal to obtain a main set signal, and transmits the signal through the main set transmit antenna;

The standby radio unit performs delayed radio frequency processing on the downlink signal to obtain a delayed radio frequency signal, and transmits the signal through the diversity transmit antenna.

Preferably, the step of radio frequency processing comprises:

The main radio unit uses its own conversion circuit to convert the downlink signal and send it to the power amplifier via its own transmitter;

Power amplification of a signal obtained via the transmitter using a power amplifier Preferably, the step of delaying radio frequency processing comprises:

The standby radio frequency unit sequentially uses its own delay circuit and conversion circuit to perform signal delay and signal conversion on the downlink signal, and sends it to the power amplifier via its own transmitter; using the power amplifier, the transmitter will pass through the transmitter The resulting signal is power amplified to obtain the delayed diversity signal.

Preferably, the method further comprises:

After receiving the uplink signal through the main set transmit antenna, the primary radio frequency unit performs low noise amplification and transmits the uplink signal to the conversion circuit via its own receiver;

The signal obtained by the receiver is converted by the conversion circuit and sent to the baseband processing unit for the baseband processing unit to perform the combining process.

Preferably, the method further comprises:

After receiving the uplink signal, the standby radio frequency unit performs low-noise amplification on the uplink signal, and sends the uplink signal to its conversion circuit via its own receiver;

According to another aspect of the present invention, a system for redundant radio backup of a base station radio frequency unit is provided, including: a main radio unit, a standby radio unit, a baseband processing unit, and two main radio units that are mutually hot backup And the standby radio frequency unit is directly connected to the same baseband processing unit, and receives the same downlink signal from the baseband processing unit, where:

The primary radio unit is configured to perform radio frequency processing on the downlink signal to obtain a main set signal, and transmit the signal through the main set transmit antenna;

The standby radio frequency unit is configured to perform delay radio frequency processing on the downlink signal to obtain a delayed radio frequency signal, and transmit the signal through the diversity transmit antenna.

Preferably, the primary radio frequency unit comprises:

a conversion circuit configured to convert the downlink signal and transmit the signal to the transmitter Send to the power amplifier;

The power amplifier is configured to power amplify the signal obtained via the transmitter to obtain the main set signal.

Preferably, the primary radio unit further includes:

a low noise amplifier configured to perform low noise amplification on an uplink signal received via the main set transmit antenna, and send the signal to the conversion circuit via the receiver;

Correspondingly, the conversion circuit is further configured to send the converted signal of the receiver to the baseband processing unit.

Preferably, the standby radio frequency unit comprises:

a delay circuit configured to delay the signal of the downlink signal;

a conversion circuit configured to convert a signal output by the delay circuit and send the signal to a power amplifier via a transmitter;

A power amplifier configured to power amplify the signal obtained via the transmitter to obtain the delay diversity signal.

Preferably, the standby radio frequency unit further includes:

a low noise amplifier configured to perform low noise amplification on an uplink signal received via the diversity transmit antenna and sent to the conversion circuit via the receiver;

Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

1. In the embodiment of the present invention, as long as one RF device can work normally in the independent primary RF unit and the standby RF unit, the normal function of the system can be ensured, and the switching time is not needed, thereby eliminating the impact of the failure during the switching. Ensure the continuity of the work of the system;

2. In the embodiment of the present invention, since the redundant hot backup is two independent radio units, and the peripheral devices including the antenna, the feeder, the power source, and the like are also independent, the two radio units are There is no common hardware part. When one RF unit is faulty, or because the supporting peripheral equipment is faulty, it will not affect the operation of the other RF unit. This can achieve sufficient hardware backup and eliminate the failure of the public part. The backup has no effect.

3. In the embodiment of the present invention, the standby radio frequency unit is normally in a normal working state, and can detect and take maintenance measures in time when there is a fault, thereby eliminating the problem that the standby radio frequency unit does not work normally, and cannot be found in time when the fault occurs, and the system is ensured. The validity of the backup. DRAWINGS

1 is a backup method provided by the prior art;

2 is a system connection diagram provided by an embodiment of the present invention;

3 is a schematic block diagram of a method for redundant radio backup of a radio frequency unit of a base station according to an embodiment of the present invention; FIG. 4 is a schematic diagram of a working principle of the system according to an embodiment of the present invention. detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The two base stations that are mutually hot backup used in the embodiments of the present invention all work at the same time, and the radio frequency part uses delay diversity transmission work, and the delay diversity transmission is a transmission technology, and the technology is transmitted on multiple antennas. The same modulated signal with different delays, when one of them fails, does not need to switch time, still can guarantee the system is in normal working state. It not only overcomes the shortcomings of switching time in the active/standby switchover in the prior art, but also solves the problem of invalid backup in the prior art that may have radio cold backup. The embodiment of the present invention will be further described below with reference to Figs. 2 to 4 .

2 is a system connection diagram provided by an embodiment of the present invention. As shown in FIG. 2, the hardware component of the same site includes two identical radio frequency units 101 of the main working base station 10 and the standby radio frequency unit 111 of the backup base station 11. , the antenna system and backup of the independent main working base station 10 The antenna feeder system of the base station 11 and the baseband processing unit 13. The two radio frequency units are respectively connected to respective antenna feeder systems, and work at the same time, the main radio frequency unit transmits the main set signal, and the standby radio frequency unit transmits the delay diversity signal. That is to say, two independent radio units that are mutually hot backup are installed at one site, and two antennas with the same coverage area are respectively connected, and two radio frequency units are directly connected to the same baseband processing unit, and receive from the baseband. The same downstream signal of the processing unit. Both the primary working base station and the backup base station work simultaneously to transmit radio frequency signals. In order to avoid the problem of radio frequency interference, the delay transmit diversity technology is adopted. As shown in FIG. 2, the main working base station transmits the main set signal, and the backup base station transmits the delay diversity signal. The delay function is implemented in the backup base station, and the delay time can be adjusted. The multipath processing capability of the mobile station can normally receive the combined processing signals. When any one of the base stations fails and cannot transmit the radio frequency signal, the mobile station only receives the radio frequency signal transmitted by the other base station, and can also normally demodulate the received signal to achieve normal communication. among them:

a conversion circuit configured to convert the downlink signal and send it to a power amplifier via a transmitter;

a power amplifier configured to perform power amplification on a signal obtained by the transmitter to obtain the main set signal;

The low noise amplifier is configured to perform low noise amplification on the uplink signal received through the main set transmit antenna, and send it to the conversion circuit via the receiver for signal conversion by the conversion circuit and then sent to the baseband processing unit.

The standby radio frequency unit is configured to perform delay radio frequency processing on the downlink signal to obtain a delay radio frequency signal, and transmit the data through the diversity transmit antenna;

a delay circuit configured to delay the signal of the downlink signal;

a conversion circuit configured to convert a signal output by the delay circuit and send the signal to a power amplifier via a transmitter; a power amplifier configured to perform power amplification on a signal obtained by the transmitter to obtain the delay diversity signal;

The low noise amplifier is configured to perform low noise amplification on the uplink signal received via the diversity transmit antenna, and send the signal to the conversion circuit via the receiver for signal conversion by the conversion circuit and then sent to the baseband processing unit.

3 is a schematic block diagram of a method for redundant radio backup of a radio frequency unit of a base station according to an embodiment of the present invention. As shown in FIG. 3, the method includes:

Step 301: Directly connect the primary radio unit and the standby radio unit that are mutually hot backup to the same baseband processing unit, and receive the same downlink signal from the baseband processing unit.

Step 302: The primary radio unit performs radio frequency processing on the downlink signal to obtain a main set signal, and transmits the signal through the main set transmit antenna.

In the step 302, the main radio unit uses its conversion circuit to convert the downlink signal and send it to its power amplifier via its transmitter; using the power amplifier, the signal obtained via the transmitter is used. Power amplification, the main set signal is obtained.

Step 303: The standby radio unit performs delay radio frequency processing on the downlink signal to obtain a delayed radio frequency signal, and transmits the signal through the diversity transmit antenna.

In the step 303, the standby radio frequency unit sequentially uses the delay circuit and the conversion circuit to perform signal delay and signal conversion on the downlink signal, and sends the signal to the power amplifier via the transmitter; The signal obtained via the transmitter is power amplified to obtain the delayed diversity signal.

Further, the method further includes: after receiving the uplink signal by the primary radio unit via the primary set transmit antenna, performing low-noise amplification on the uplink signal, and transmitting the signal to the conversion circuit via the receiver; using the conversion circuit, The signals obtained via the receiver are signal converted and sent to the baseband processing unit for the baseband processing unit to perform the combining process.

Further, the method further includes: after the standby radio unit receives the uplink signal via the diversity transmit antenna, Performing low-noise amplification on the uplink signal and transmitting it to its conversion circuit via its receiver; using the conversion circuit, converting the signal obtained by the receiver and transmitting the signal to the baseband processing unit for baseband The processing unit performs a merge process.

4 is a schematic diagram of the working principle of the system according to the embodiment of the present invention. As shown in FIG. 4, the two RF units include a duplexer, a power amplifier, a low noise amplifier, and a transceiver board, and are connected to the baseband processing unit through a CPRI interface. The transceiver board includes a delay circuit that can adjust a delay of the downlink signal. The two radio frequency units simultaneously receive the same downlink signal sent by the baseband processing unit, and the radio frequency unit 111 delays the downlink signal in its digital circuit portion, and the delay time can be adjusted as needed. The other parts work in the same way as the normal primary radio unit 101.

Two basic signals are sent from the baseband processing unit to complete the same downlink signal, and are simultaneously sent to the transceiver boards of the two radio units through the CPRI interface. In the main radio unit 101, the downlink signal is converted to a transmitter directly after being converted by the conversion circuit, and the transmitter output is sent to the power amplifier, and the radio signal (main set signal) is radiated to the coverage cell via the duplexer to the antenna. In the standby RF unit 111, the downlink signal is delayed by the delay circuit, and after being converted by the conversion circuit, sent to the transmitter, the output of the transmitter is sent to the power amplifier, and the wireless signal is sent to the antenna via the duplexer (delay diversity) The signal) is radiated into the same coverage cell as the primary radio unit 101.

The uplink signals transmitted from the mobile station of the same cell are simultaneously received by the antennas of the primary radio unit 101 and the standby radio unit 111, and are sent to the receiver through the antenna feeder, the duplexer and the low noise amplifier, and are converted by the conversion circuit. The CPRI (The Common Public Radio Interface) interface sends the signals output by the two RF units to the baseband processing unit, and the two signals are divided and received in the baseband processing unit.

In the normal working state, the two base station radio units work simultaneously, the main radio unit transmits the main set signal, and the sub-radio unit transmits the delay diversity signal. After the mobile station receives the two signals, the equalizer is used to complete the two signals. The combined reception, completes the signal processing of it. The two RF units simultaneously receive the uplink signal, and the baseband processing unit completes the diversity of the two uplink signals. And function.

When one of the devices fails, the failed device stops working and a warning message is reported. Another normal working device is not affected and continues to work normally. On the downlink side, the mobile station receives any downlink signal to complete the signal reception and processing, ensuring the normal operation of the service, and the service is not affected. On the uplink side, the signal transmitted by the mobile station can still be received by the working RF unit and sent to the baseband processing unit. The baseband processing unit can process the uplink signal normally, ensuring the normal operation of the service, and the service is not affected, without interruption. .

The above CPRI defines an interface relationship between a base station data processing control unit (REC) and a base station transceiver unit (Radio Equipment, RE), and the data structure thereof can be used for remote transmission of data of the radio unit to become a base station. A kind of remote system.

The transmit diversity technique performed between the two base stations can achieve the effect of hot backup, and is not limited to the delayed transmit diversity technique described in the embodiment of the present invention.

In summary, the embodiments of the present invention have the following technical effects:

1. The embodiment of the present invention adopts two independent base station radio units for redundant hot backup, which can realize full backup of the hardware, does not require the switching time required for base station switching, and achieves the effect of continuous operation of the wireless air interface, thereby avoiding the possibility that the train may exist. The out-of-control time greatly improves the reliability and safety of high-speed train control;

2. In the embodiment of the present invention, the backup base station is always in a working state, and there is a problem that there may be a fault that does not appear when the radio frequency cold backup is performed, and the phenomenon of invalid backup is avoided.

Although the invention has been described in detail above, the invention is not limited thereto, and various modifications may be made by those skilled in the art in accordance with the principles of the invention. Therefore, modifications made in accordance with the principles of the present invention should be construed as falling within the scope of the present invention. Industrial applicability

In the embodiment of the present invention, the primary radio frequency unit and the standby radio frequency unit that are mutually hot backup are directly connected to the same baseband processing unit, and receive the same downlink signal from the baseband processing unit; The downlink signal is subjected to radio frequency processing to obtain a main set signal, and is transmitted through the main set transmit antenna; the standby radio unit performs delay radio frequency processing on the downlink signal to obtain a delayed radio frequency signal, and performs the diversity transmit signal through the diversity transmit antenna. emission. In the embodiment of the present invention, the radio units of two independent active and standby base station devices can implement hot backup of the active and standby functions without switching time.

Claims

claims

1. A method for redundant hot backup of base station radio frequency units. The method includes:

Directly connect the main radio frequency unit and the backup radio frequency unit that are hot backups to each other to the same baseband processing unit, and receive the same downlink signal from the baseband processing unit;

The main radio frequency unit performs radio frequency processing on the downlink signal to obtain the main set signal, and transmits it through the main set transmitting antenna;

The radio frequency unit performs delayed radio frequency processing on the downlink signal to obtain a delayed radio frequency signal, and transmits it through the diversity transmitting antenna.

2. The method according to claim 1, wherein the step of radio frequency processing includes: the main radio frequency unit uses its own conversion circuit to convert the downlink signal and sends it to the power amplifier through its own transmitter. ;

The power amplifier is used to power amplify the signal obtained through the transmitter to obtain the main set signal.

3. The method according to claim 1 or 2, wherein the step of delayed radio frequency processing includes:

The prepared radio frequency unit sequentially uses its own delay circuit and conversion circuit to perform signal delay and signal conversion on the downlink signal, and sends it to the power amplifier via its own transmitter; using the power amplifier, the downlink signal is transmitted via the transmitter. The signal obtained by the communication machine is power amplified to obtain the delay diversity signal.

4. The method according to claim 1, wherein the method further includes:

After the main radio frequency unit receives the uplink signal through the main transmit antenna, it performs low-noise amplification on the uplink signal and sends it to the conversion circuit through its own receiver;

The conversion circuit is used to convert the signal obtained through the receiver and send it to the baseband processing unit for combining processing by the baseband processing unit.

5. The method according to claim 1 or 4, wherein the method further includes: After the radio frequency unit receives the uplink signal through the diversity transmitting antenna, it performs low-noise amplification on the uplink signal and sends it to the conversion circuit through its own receiver;

6. A redundant hot backup system for base station radio frequency units. The system includes: a main radio frequency unit, a backup radio frequency unit, and a baseband processing unit. The main radio frequency unit and the backup radio frequency unit that are hot backups for each other are directly connected to the same baseband. processing unit, and receives the same downlink signal from the baseband processing unit, where:

The main radio frequency unit is configured to perform radio frequency processing on the downlink signal to obtain a main set signal, and transmit it through the main set transmitting antenna;

The radio frequency preparation unit is configured to perform delayed radio frequency processing on the downlink signal to obtain a delayed radio frequency signal, and transmit it through a diversity transmitting antenna.

7. The system according to claim 6, wherein the main radio frequency unit includes: a conversion circuit configured to convert the downlink signal and send it to a power amplifier via a transmitter;

The power amplifier is configured to power amplify the signal obtained through the transmitter to obtain the main set signal.

8. The system according to claim 7, wherein the main radio frequency unit further includes: a low-noise amplifier configured to perform low-noise amplification on the uplink signal received via the main transmit antenna, and send it to the receiver via the receiver. conversion circuit;

Correspondingly, the conversion circuit is also configured to send the signal converted by the receiver to the baseband processing unit.

9. The system according to claim 6, wherein the radio frequency backup unit includes: a delay circuit configured to delay the downlink signal;

A conversion circuit configured to convert the signal output by the delay circuit and pass it through The transmitter sends to the power amplifier;

The power amplifier is configured to power amplify the signal obtained through the transmitter to obtain the delay diversity signal.

10. The system according to claim 9, wherein the radio frequency backup unit further includes: a low-noise amplifier configured to perform low-noise amplification on the uplink signal received via the diversity transmit antenna, and send it to the conversion via the receiver. circuit;