KR20020034534A - Device for suppling multi rf and if reference frequency duplicated in mobile bts system - Google Patents

Abstract

PURPOSE: A duplex RF and IF reference frequency multiple providing apparatus in a BTS(Base Transceiver Station) is provided to save the number of component and development cost by embodying a PLL(Phase Locked Loop) synthesizer as each sector-classified single duplex device. CONSTITUTION: An up IF PLL synthesizer(110) receives 10MHz clocks from a GPS(Global Positioning System) satellite or an oscillator and simultaneously generates an up IF reference frequency using the 10MHz clocks. The first 4:1 splitter(120) receives the up IF reference frequency from the up IF PLL synthesizer(110), splits the received up IF reference frequency, and provides the split up IF reference frequencies to up IF mixers in α, β, γ, and redundancy sectors. A down IF PLL synthesizer(210) receives 10MHz clocks from the GPS satellite or the oscillator and simultaneously generates a down IF reference frequency using the 10MHz clocks. The second 4:1 splitter(220) receives the down IF reference frequency from the down IF PLL synthesizer(210), splits the received down IF reference frequency, and provides the split down IF reference frequencies to down IF mixers in the α, β, γ, and redundancy sectors. An RF PLL synthesizer(310) receives 10MHz clocks from the GPS satellite or the oscillator and simultaneously generates an RF reference frequency using the 10MHz clocks. An 8:1 splitter(320) receives the RF reference frequency from the RF PLL synthesizer(310), splits the received RF reference frequency, and provides the split RF reference frequencies to up/down IF mixers in the α, β, γ, and redundancy sectors. A control unit(400) checks fault situation at active sides of the up/down IF PLL synthesizers(110,210) and the RF PLL synthesizer(310) and outputs a switching control signal to a corresponding PLL synthesizer when abnormality is generated in the active sides.

Description

Redundant RF and IF reference frequency multi-supply devices in mobile communication base station system {DEVICE FOR SUPPLING MULTI RF AND IF REFERENCE FREQUENCY

The present invention relates to a redundant radio frequency (RF) and an intermediate frequency (IF) reference frequency multiplexing device in a mobile communication base station system. Is a PLL that supplies an IF or RF reference frequency for the RF and IF mixers, respectively, in the α, β, γ, Redundancy (“R”) sector-by-sector analog up / down converters. (Phase Lock Loop; hereinafter referred to as "PLL".) The redundant RF and IIF reference frequency multi-supply devices in mobile communication base station systems that provide a more stable reference signal by implementing a synthesizer as a single redundancy device. It is about.

In general, the analog up / down converter in the conventional mobile communication base station system includes an independent IF and RF PLL synthesizer for each of α, β, γ, and R sectors. In addition, each of the above-described PLL synthesizers is not redundantly implemented.

Therefore, in the past, when an operator designed an analog up / down converter in a mobile communication base station system, eight up PLL synthesizers and eight down PLL synthesizers had to be independently mounted for each sector, thereby increasing the number of parts and thus developing a system. There was a problem of rising costs.

In addition, conventionally, since the RF or IF PLL synthesizer is not implemented in redundancy, when each PLL synthesizer fails, the operation state of the up / down converter for each sector is paralyzed, which causes RF to each sector RF and IF mixer. Or there was a problem that can not supply the IF reference frequency.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to implement a PLL synthesizer as a single redundancy device for each sector when implementing an analog up / down converter in a base station. In addition, the present invention provides a redundant RF and IIF reference frequency multiplexing device in a mobile communication base station system to reduce the cost and improve system performance thereby providing a more stable RF or IF reference frequency.

In order to achieve the above object, the redundant RF and IF reference frequency multiplexing devices in the mobile communication base station system of the present invention receive a 10MHz clock from a GPS satellite or an oscillator and use the 10MHz clock to up-frequency reference frequency. An up-IF PLL synthesizer section that is dualized with active / stand-by while generating a;

A first 4: 1 splitter configured to receive the up IF reference frequency from the up IF PLL synthesizer and divide and supply the up IF reference frequency to the up IF mixer in the α, β, γ, and R sectors;

A down IF PLL synthesizer that receives a 10 MHz clock from a GPS satellite or oscillator and generates a down IF reference frequency using the 10 MHz clock, and is dualized into active / standby;

A second 4: 1 divider which receives the down IF reference frequency from the down IF PLL synthesizer and divides and supplies them to down IF mixers in the α, β, γ, and R sectors, respectively;

An RF PLL synthesizer unit which receives a 10 MHz clock from a GPS satellite or an oscillator and simultaneously generates an RF reference frequency using the 10 MHz clock, and is dualized into active / stand-by;

An 8: 1 splitter that receives the RF reference frequency from the RF PLL synthesizer and divides and supplies each of the up, down, and down IF mixers in the α, β, γ, and R sectors; And

The controller checks the active side fault condition of the up / down IF PLL synthesizer and RF PLL synthesizer, and outputs a switching control signal, which is an active / standby switching signal, to the corresponding PLL synthesizer when an error occurs on the active side. Characterized in that configured.

1 is a functional block diagram showing the overall configuration of an analog up / down converter in a conventional mobile communication base station system,

2 is a functional block diagram showing the configuration of a redundant RF and IF reference frequency supply apparatus in a mobile communication base station system according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110: up IF PLL synthesizer 111: active up IF PLL synthesizer

112: Stand-up IF PLL Synthesizer

113: SPDT switch 120: the first 4: 1 splitter

210: Down IF PLL synthesizer 211: Active down IF PLL synthesizer

212: Stand by Down IF PLL Synthesizer

213: SPDT switch 220: the second 4: 1 splitter

310: RF PLL synthesizer 311: Active RF PLL synthesizer

312: Stand By RF PLL Synthesizer

313: SPDT switch 320: 8: 1 distributor

400: control unit

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, redundant RF and IF reference frequency multiplexing devices in a mobile communication base station system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a functional block diagram of a redundant RF and IF reference frequency multiplexing device in a mobile communication base station system according to an embodiment of the present invention, and the redundant RF in a mobile communication base station system according to an embodiment of the present invention. And the IF reference frequency multiplexer includes an up IF PLL synthesizer 110, a first 4: 1 divider 120, a down IF PLL synthesizer 210, a second 4: 1 divider 220, and an RF PLL synthesizer. It comprises a 310, 8: 1 distributor 320, and the control unit 400.

The up IF PLL synthesizer 110 is dualized as active / stand-by, while receiving a 10 MHz clock from a GPS satellite or an oscillator 1 and using the 10 MHz clock. To generate an up-IF reference frequency and output it to the first 4: 1 divider 120, and an active-up IF PLL synthesizer 111, a stand-up IF PLL synthesizer 112, and a single pole SPDT. , Double Throw; hereafter referred to as " SPDT. &Quot;

At this time, the active up IF PLL synthesizer 111 mounted in the up IF PLL synthesizer 110 receives a 10 MHz clock from a GPS satellite or oscillator 1 and generates an up IF reference frequency using the 10 MHz clock. And then outputs to the first 4: 1 distributor 120.

In addition, the stand by up IF PLL synthesizer 112 mounted in the up IF PLL synthesizer 110 receives a 10 MHz clock from a GPS satellite or oscillator 1 and simultaneously uses the 10 MHz clock to adjust the up IF reference frequency. After generating it serves to output to the first 4: 1 distributor 120.

The SPDT switch 113 mounted in the up IF PLL synthesizer 110 is a switch for performing a redundancy operation by a switching control signal of the controller 400. The stand-up IF PLL synthesizer 112 and the first 4: 1 divider 120 are connected to each other by connecting the first 4: 1 divider 120 and receiving the switching control signal from the controller 400. It serves to connect.

In addition, the first 4: 1 divider 120 receives the up IF reference frequency output from the up IF PLL synthesizer 110 and sets the up IF reference frequency in α, β, γ, and R sectors. It divides and feeds the IF mixers 11, 12, 13 and 14, respectively.

Meanwhile, the down IF PLL synthesizer 210 is dualized as active / standby, while receiving a 10 MHz clock from a GPS satellite or oscillator 1 and generating a down IF reference frequency using the 10 MHz clock. The second 4: 1 divider 220 is then output to the active unit, and is composed of an active down IF PLL synthesizer 211, a stand by down IF PLL synthesizer 212, and an SPDT switch 213.

At this time, the active down IF PLL synthesizer 211 mounted in the down IF PLL synthesizer 210 receives a 10 MHz clock from a GPS satellite or oscillator 1 and generates a down IF reference frequency using the 10 MHz clock. And then outputs to the second 4: 1 distributor 220.

In addition, the stand-by-down IF PLL synthesizer 212 mounted in the down IF PLL synthesizer 210 receives a 10 MHz clock from a GPS satellite or oscillator 1 and uses the 10 MHz clock to adjust the down IF reference frequency. After the generation of the second 4: 1 distributor 220 serves to output.

The SPDT switch 213 mounted in the down IF PLL synthesizer 210 is a switch for performing a redundancy operation by a switching control signal of the controller 400. The stand-down IF PLL synthesizer 212 and the second 4: 1 divider 220 are connected to each other by connecting the second 4: 1 divider 220 and receiving the switching control signal from the controller 400. It serves to connect.

In addition, the second 4: 1 divider 220 receives a down IF reference frequency output from the down IF PLL synthesizer 210 and simultaneously downs the down IF reference frequency in α, β, γ, and R sectors. It divides and feeds the IF mixers 15, 16, 17 and 18, respectively.

On the other hand, the RF PLL synthesizer 310 is dual-active / stand-by, while receiving a 10MHz clock from the GPS satellite or oscillator (1) and generates an RF reference frequency using the 10MHz clock and then the It serves to output to an 8: 1 splitter 320, and consists of an active RF PLL synthesizer 311, a stand-by RF PLL synthesizer 312, and an SPDT switch 313.

In this case, the active RF PLL synthesizer 311 mounted in the RF PLL synthesizer 310 receives a 10 MHz clock from a GPS satellite or oscillator 1 and generates an RF reference frequency using the 10 MHz clock. It serves to output to the 8: 1 distributor (320).

In addition, the stand-by RF PLL synthesizer 312 mounted in the RF PLL synthesizer 310 receives a 10 MHz clock from a GPS satellite or oscillator 1 and generates an RF reference frequency using the 10 MHz clock. Output to the 8: 1 distributor 320.

The SPDT switch 313 mounted in the RF PLL synthesizer 310 performs a redundancy operation by a switching control signal of the controller 400. The first divider 320 is connected and switched when the switching control signal is input from the control unit 400, thereby connecting the stand-by RF PLL synthesizer 312 and the 8: 1 divider 320.

In addition, the 8: 1 divider 320 receives an RF reference frequency output from the RF PLL synthesizer 310 and simultaneously converts the RF reference frequencies into α, β, γ, and R sector up / down RF mixers ( 21, 22, 23, 24, 25, 26, 27, 28).

On the other hand, the control unit 400 checks fault conditions of the active up IF PLL synthesizer 111, the active down IF PLL synthesizer 211, and the active RF PLL synthesizer 311, respectively. When this occurs, the switching control signal, which is an active / stand-by switching signal, is output to the SPDT switches 113, 213, and 313 in the corresponding PLL synthesizers 110, 210, and 310, respectively.

Next, an operation process of the redundant RF and IF reference frequency multiplexing devices in the mobile communication base station system having the above configuration will be described with reference to FIG. 2.

First, in the following, the up IF PLL synthesizer 110 generates an up IF reference frequency and then divides and supplies the up IF mixer 11, 12, 13, and 14 to the up IF mixers 11, 12, 13, and 14 in the R sector. This will be described.

First, the SPDT switch 113 mounted in the up IF PLL synthesizer 110 connects the active up IF PLL synthesizer 111 and the first 4: 1 divider 120, while the stand-up IF PLL is connected. The output of synthesizer 112 is blocked.

Initially, the active up IF PLL synthesizer 111 receives a 10 MHz clock from a GPS satellite or oscillator 1, generates an up IF reference frequency using the 10 MHz clock, and then generates the first 4: 1 divider 120. )

Then, the first 4: 1 divider 120 receives an up-IF reference frequency output from the up-IF PLL synthesizer 110 and simultaneously sets up-up IF reference frequencies in α, β, γ, and R sectors. The feed is divided into IF mixers 11, 12, 13, and 14, respectively.

At this time, the controller 400 checks the failure state of the active-up IF PLL synthesizer 111, and if an error occurs, outputs a switching control signal, which is an active / stand-by switching signal, to the SPDT switch 113. .

Then, the SPDT switch 113 is switched at the same time as receiving the switching control signal from the controller 400, thereby connecting the stand-up IF PLL synthesizer 112 and the first 4: 1 divider 120. The output of the active up IF PLL synthesizer 111 is blocked.

Therefore, after the switching operation of the SPDT switch 113, the up IF reference frequency generated by the stand-up IF PLL synthesizer 112 is the up-IF mixer 11, 12, 13 in the R, β, γ, and R sectors. And 14).

Meanwhile, in the following operation, the down IF PLL synthesizer 210 generates a down IF reference frequency and then divides and supplies the up IF mixers 15, 16, 17, and 18 in the α, β, γ, and R sectors, respectively. This will be described.

First, an SPDT switch 213 mounted in the down IF PLL synthesizer 210 connects the active down IF PLL synthesizer 211 and the second 4: 1 divider 220, while the stand-by down IF PLL. The output of synthesizer 212 is blocked.

Initially, the active down IF PLL synthesizer 211 receives a 10 MHz clock from a GPS satellite or oscillator 1, generates a down IF reference frequency using the 10 MHz clock, and then generates the second 4: 1 divider 220. )

Then, the second 4: 1 divider 220 receives the down IF reference frequency output from the down IF PLL synthesizer 210 and down the down IF reference frequency in α, β, γ, and R sectors. The feed is divided into IF mixers 15, 16, 17 and 18, respectively.

At this time, the controller 400 checks the failure state of the active down IF PLL synthesizer 211, and if an error occurs, outputs a switching control signal, which is an active / standby switching signal, to the SPDT switch 213. .

Then, the SPDT switch 213 is switched at the same time as receiving the switching control signal from the controller 400, thereby connecting the stand-by-down IF PLL synthesizer 212 and the second 4: 1 divider 220, The output of the active down IF PLL synthesizer 211 is cut off.

Therefore, after the switching operation of the SPDT switch 213, the down IF reference frequency generated by the stand-by-down IF PLL synthesizer 212 is the down IF mixer 15, 16, 17 in the α, β, γ, and R sectors. And 18), respectively.

Meanwhile, in the following, the RF PLL synthesizer 310 generates an RF reference frequency and then the up / down RF mixers 21, 22, 23, 24, 25, 26, 27, and 28 in the α, β, γ, and R sectors. Will be described in the operation process of divided supply.

First, an SPDT switch 313 mounted in the RF PLL synthesizer 310 connects the active RF PLL synthesizer 311 and the 8: 1 splitter 320, while the stand-by RF PLL synthesizer 312 The output is cut off.

First, the active RF PLL synthesizer 311 receives a 10 MHz clock from a GPS satellite or oscillator 1, generates an RF reference frequency using the 10 MHz clock, and outputs the RF reference frequency to the 8: 1 divider 320. .

Then, the 8: 1 divider 320 receives the RF reference frequency output from the RF PLL synthesizer 310 and simultaneously converts the RF reference frequencies into α, β, γ, and up / down RF mixers in the R sector. 21, 22, 23, 24, 25, 26, 27, 28).

At this time, the controller 400 checks the failure state of the active RF PLL synthesizer 311, and if an abnormality occurs, the controller 400 outputs a switching control signal, which is an active / standby switching signal, to the SPDT switch 313.

Then, the SPDT switch 313 is switched at the same time as receiving a switching control signal from the control unit 400, thereby connecting the stand-by RF PLL synthesizer 312 and the 8: 1 splitter 320, the active The output of the RF PLL synthesizer 311 is cut off.

Therefore, after the switching operation of the SPDT switch 313, the RF reference frequency generated by the stand-by RF PLL synthesizer 312 is equal to the RF mixers 21, 22, 23, 24, in the α, β, γ, and R sectors. 25, 26, 27 and 28 will be supplied separately.

As described above, according to the redundant RF and IF reference frequency multiplexing devices in the mobile communication base station system according to the present invention, when implementing the analog up / down converter in the base station, the PLL synthesizer is implemented as a single redundancy device for each sector. In addition to reducing the number of development and development costs, the result is an improved system performance, which enables the supply of more stable RF or IF reference frequencies to each sector's RF and IF mixers.

Claims (4)

An up IF PLL synthesizer unit which receives a 10 MHz clock from a GPS satellite or an oscillator and simultaneously generates an up IF reference frequency using the 10 MHz clock, and is dualized into active / stand-by; A first 4: 1 splitter configured to receive the up IF reference frequency from the up IF PLL synthesizer and divide and supply the up IF reference frequency to the up IF mixer in the α, β, γ, and R sectors; A down IF PLL synthesizer that receives a 10 MHz clock from a GPS satellite or oscillator and generates a down IF reference frequency using the 10 MHz clock, and is dualized into active / standby; A second 4: 1 divider which receives the down IF reference frequency from the down IF PLL synthesizer and divides and supplies them to down IF mixers in the α, β, γ, and R sectors, respectively; An RF PLL synthesizer unit which receives a 10 MHz clock from a GPS satellite or an oscillator and simultaneously generates an RF reference frequency using the 10 MHz clock, and is dualized into active / stand-by; An 8: 1 splitter that receives the RF reference frequency from the RF PLL synthesizer and divides and supplies each of the up, down, and down IF mixers in the α, β, γ, and R sectors; And The controller checks the active side fault condition of the up / down IF PLL synthesizer and RF PLL synthesizer, and outputs a switching control signal, which is an active / standby switching signal, to the corresponding PLL synthesizer when an error occurs on the active side. A redundant RF and IIF reference frequency multiplexing device in a mobile communication base station system, characterized in that configured. The method of claim 1, The up IF PLL synthesizer unit includes: an active up IF PLL synthesizer configured to receive a 10 MHz clock from a GPS satellite or an oscillator and generate an up IF reference frequency using the 10 MHz clock; A stand-up IF PLL synthesizer that receives a 10 MHz clock from a GPS satellite or oscillator and generates an up IF reference frequency using the 10 MHz clock; And An SPDT switch that connects the active up IF PLL synthesizer and the first 4: 1 divider, and switches when the switching control signal is input from the controller to connect the stand-up IF PLL synthesizer and the first 4: 1 divider. A redundant RF and IIF reference frequency multiplexing device in a mobile communication base station system, characterized in that configured. The method of claim 1, The down IF PLL synthesizer unit includes: an active down IF PLL synthesizer that receives a 10 MHz clock from a GPS satellite or an oscillator and generates a down IF reference frequency using the 10 MHz clock; A stand-by down IF PLL synthesizer that receives a 10 MHz clock from a GPS satellite or oscillator and generates a down IF reference frequency using the 10 MHz clock; And A SPDT switch that connects the active down IF PLL synthesizer and the second 4: 1 divider and switches when the switching control signal is input from the controller to connect the stand-down IF PLL synthesizer and the second 4: 1 divider. A redundant RF and IIF reference frequency multiplexing device in a mobile communication base station system, characterized in that configured. The method of claim 1, The RF PLL synthesizer unit includes: an active RF PLL synthesizer that receives an 10 MHz clock from a GPS satellite or an oscillator and generates an RF reference frequency using the 10 MHz clock; A stand-by RF PLL synthesizer that receives a 10 MHz clock from a GPS satellite or oscillator and generates an RF reference frequency using the 10 MHz clock; And A movement that connects the active RF PLL synthesizer and the 8: 1 divider and is switched upon receipt of a switching control signal from the control unit to connect the stand-by RF PLL synthesizer and the 8: 1 divider. Redundant RF and IIF reference frequency multiplexing devices in a communication base station system.