KR20000045595A - Device for sharing duplexing high power amplifier of multi-channel radio port - Google Patents

Abstract

PURPOSE: A device for sharing duplexing HPA(high power amplifier) of multi-channel radio port is provided to divide and combine the outputs of extra HPA using a combiner, thereby compensating signal loss between normal transfer paths and duplexing transfer paths. CONSTITUTION: A device for sharing duplexing high power amplifier of multi-channel radio port comprises a path controller(170,270), a front 3:5 switch unit(100), a rear 1:2 switch unit(140), a front combiner(130) and a rear 3:4 switch(160). The path controller(170,270) monitors the state of the HPA of one channel and transceives state information with the path controllers of another channels. The front 3:5 switch unit(100) consists a 3:4 switch(110) and a 1:2 switch(120). The rear 1:2 switch unit(140) switches the filters of respective HPAs in accordance with the control of the path controller. The front combiner(130) combines one of outputs of the rear 1:2 switch and one of outputs of a rear 1:2 switch of the HPA. The rear 3:4 switch(160) switches the outputs of the HPA and the rear combiner and the filters.

Description

A device for sharing a redundant large power amplifier for each channel of a multi-channel base station

The present invention relates to a harmonic processing (Radio Frequency (RF)) processing unit in a base station of a wireless local loop (WLL) system, in particular a high-power extra power amplifier for each channel in the harmonic processing unit of a multi-channel base station; The present invention relates to an apparatus for sharing a redundant high-power amplifier for each channel of a multi-channel base station that compensates a signal loss difference between a normal transmission path and a redundant transmission path when sharing HPA).

In general, a wireless subscriber network system includes a fixed terminal such as a terminal of a public switched telephone network (PSTN), a terminal of an integrated services digital network (ISDN), and an asynchronous data transmission service terminal. The present invention provides a service to a fixed terminal by transmitting and receiving a signal through radio communication between a radio interface unit (RIU) and a base station (Radio port; RP).

In order to perform the wireless communication with the subscriber access device, the base station converts the signal into harmonics, amplifies the power so that the subscriber access device can receive a signal having a good reception quality, and then radiates it into the air through an antenna.

Meanwhile, a base station of a WLL system uses a wireless channel to perform wireless communication with a subscriber access device. When a plurality of subscribers need to be accommodated by one base station, the wireless channel is allocated to multiple channels.

An apparatus in which a large power amplifier is duplicated in a harmonic processing unit of a base station to which such a multi-channel is allocated is shown in FIGS. 1A and 1B.

1A is a block diagram of a high power amplifier redundancy device for one channel.

As shown in the figure, α for converting an intermediate frequency (IF) signal for a forward link of each sector into a radio frequency (RF) signal in the harmonic processing unit of the WLL base station. An upconverting section 10 composed of an upconverter 10a, a beta upconverter 10b, and a gamma upconverter 10c; A high power amplifier 13 comprising a high power amplifier (HPA) 13a, a βHPA 13b, and a γHPA 13c for amplifying radio frequency signals of each sector; An extra R HPA 14 per channel; A path control unit (RFC) 11 which inspects a state of the high power amplifier 13 and controls a path between the upconverting unit 30, the high power amplifier 13, and the R HPA 14; ; The up-converters 10a, 10b, 10c of the up-converting unit 10 correspond to one-to-one correspondence of the large-power amplifiers 13a, 13b, 13c of the large-power amplifier 13, and the path controller A first 3: 4 switch 12 for switching a path between the upconverting unit 30, the large power amplifier 13, and the R HPA 14 under the control of (11); A second 3: 4 switch 15 which operates in the same manner as the first 3: 4 switch 12 under the control of the path controller 11; Transmitter front end unit (16) for filtering out unnecessary components in the radio frequency signal through the second 3: 4 switch (15).

In the large power amplifier redundancy apparatus for one channel of the multi-channel base station as described above, as shown in FIG. 1B, the large power amplifier is implemented by redundancy.

Such a large power amplifier redundancy device can amplify a radio frequency signal by switching to an extra R HPA 14 when a failure occurs in one of the HPAs of the αHPA 13a, the βHPA 13b, and the γHPA 13c. However, when a failure occurs in two or more HPAs, a problem arises in that the capacity for coping with the redundancy falls.

Therefore, as shown in FIG. 2, an R HPA provided as an extra one for each channel is shared to be shared among the multi-channel systems.

As shown therein, the upconverting unit 30 converts the intermediate frequency (IF) signal for the forward link of each sector into a radio frequency (RF) signal in the harmonic processing unit of the WLL base station, respectively. ? upconverter 30b,? upconverter 30c.

The first front-end 3: 5 switch unit 31 is configured to convert each upconverter 30a, 30b, 30c of the upconverting unit 30 and each HPA 34a, 34b, 34c of the large power amplifier 34. Corresponds one-to-one and switches the paths under the control of the first path control unit 32 so as to share the path of the redundant R HPA for each channel.

Each shear attenuator 33a, 33b, 33c is connected to the front end of each of the HPAs 34a, 34b, 34c of the large power amplifier 34 to receive radio frequency signals through the first front end 3: 5 switch unit 31. Attenuate The large power amplifier 34 is composed of αHPA 34a, βHPA 34b, and γHPA 34c that amplify corresponding radio frequency signals in each sector. Each rear end attenuator 35a, 35b, 35c attenuates the signal through each HPA.

A combiner 36 combines the paths from the front end channel-specific 3: 5 switch section to provide a channel-specific signal path and then sends its output to the R HPA 37. The R HPA 37 is redundantly provided for the first channel and is shared with each channel by the front end 3: 5 switch unit and the rear end 3: 5 switch unit for each channel. The separator 38 separates the output of the R HPA 37 so that the R HPA 37 can be shared with each other by channel.

The first path controller (RFC # 1) 32 monitors the state of each of the HPAs 34a, 34b, 34c of the large power amplifier 34 for the first channel and the second path controller (RFC # 2) ( 52) send and receive status information to control the path.

The first rear stage 3: 5 switch unit 39 operates in the same manner as the first front stage 3: 5 switch unit 31 under the control of the second path controller (RFC # 2) 52. Each filter 40a, 40b, 40c of the filter unit 40 filters out unnecessary components from the signal through the first rear stage 3: 5 switch unit 39 and transmits them to the antenna of each sector.

The configuration of the large power amplifier redundancy device for the second channel is also configured in the same manner as the configuration of the large power amplifier redundancy device for the first channel. The second path control unit 52 monitors the state of the large power amplifier 57 for the second channel and exchanges state information with the first path control unit 32 to mutually provide an extra R HPA for each channel. Share it.

Referring to the operation of the apparatus for sharing the dual redundant power amplifier for each channel, each up-converter (30a, 30b, 30c) in the up-converting section 30 of the first channel is the first front end 3: 5 switch ( 31 is connected one-to-one with each HPA (34a, 34b, 34c) of the large power amplifier 34. The first rear stage 3: 5 switch unit 39 connects the large power amplifier 34 and the filter unit 40 one-to-sector per sector in the same manner as the operation of the first front stage 3: 5 switch unit 31.

The first path controller (RFC # 1) 32 monitors the state of the high power amplifier 34 and detects a failure of the αHPA 34a when a failure occurs in the αHPA 34a corresponding to the α sector, and the αHPA 34a. To replace with R HPA 37. That is, the first upstream 3: 5 switch unit 31 is controlled to transfer the? Up-converter 30a from the? HPA 34a to the R HPA 37. Thus, the function of αHPA 34a is performed in R HPA 37 instead.

The first path control unit 32 monitors the state of the R HPA for each channel by transmitting and receiving state information with the second path control unit 52.

Then, if a failure occurs in the R HPA 37 for the first channel, the first path control unit 320 detects this and controls the path switching to the R HPA 57 for the second channel. The unit 31 switches the output of the upconverter 30a to the R HPA 57 provided redundantly in the second channel.

In addition, when the HPH 37 for the first channel is being performed in place of the function of the αHPA 34a, when the βHPA 30b fails, the first path control unit 32 performs an R HPA 57 for the second channel. Perform the transfer to). By sharing the redundant HPA per channel, it is possible to replace two or more HPA errors.

However, a combiner 36 is provided at the front end of the R HPA 37 so that the R HPA 37 for the first channel is shared by the large power amplifier redundancy device for each channel. Thus, after combining one output pin of the first front end 3: 5 switch part 31 and one output pin of the second front end 3: 5 switch part 51 in this coupler 36, R HPA Transfer to 37. In order to share the output path of the R HPA 37 between the first rear 3: 5 switch 39 and the second rear 3: 5 switch 59, the output of the R HPA 37 is separated. A splitter 38 performs this function. In this way, a coupler is provided at the front end of the redundant HPA provided for each channel, and a separator is provided at the rear end so that a redundant large power amplifier per channel can be shared with each other.

However, the use of the separator 38 in the R HPA 37 results in a loss of about 3 dB (decibel) in the power level of the signal through the R HPA 37 path than the power level of the signal through the αHPA 34a. In other words, the difference in signal power level between the normal path and the redundant path should be compensated for. To this end, attenuators pads 33a, 33b, 33c, 35a, 35b, and 35c are provided at the front and rear ends of the αHPA 34a, βHPA 34b, and γHPA 34c, respectively.

In order to share a large power amplifier redundancy device for each channel in a multi-channel base station, a separate device must be provided to compensate for the difference in signal power level between the normal HPA path and the redundant HPA path. Disadvantages have arisen.

In addition, there is a problem that the 3: 5 switch unit is difficult to realize as a single component.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to provide a redundant high power amplifier for each channel in a harmonic (Radio Frequency) RF processing unit of a multi-channel base station; When sharing the HPA), the output of the redundant HPA is separated by a 1: 2 switch, and the output of the redundant HPA for each channel is combined with a combiner to compensate for the signal loss difference between the normal transmission path and the redundant transmission path. The present invention provides a device for sharing a star redundant large power amplifier.

In order to achieve the above object, an apparatus for sharing a redundant high power amplifier for each channel of a multi-channel base station according to the present invention,

In the Radio Frequency (RF) processing unit of a multi-channel wireless subscriber network (WLL) system base station, a redundant path is shared between the large power amplifier redundancy devices for each channel to share each redundant large power amplifier of each high power amplifier redundancy device. The front end 3: 5 switch part to be provided is composed of a 3: 4 switch and a 1: 2 switch, and the rear end of each redundant large power amplifier is connected to the rear end 1: 2 switch, and each rear end of each large power amplifier redundancy 1: Connect the rear coupler to combine one of the outputs of the two switches, and connect the large power amplifier of each large power amplifier redundancy unit with the rear 3: 4 switch to switch between the rear coupler and the filter. As such, the present invention compensates for the difference in signal power levels between the normal path using the normal high power amplifier and the redundant path using the redundant high power amplifier.

1a and 1b is a configuration diagram of a channel-specific redundant large power amplifier for the forward link of the conventional base station,

2 is a block diagram of a shared device of a redundant high-power amplifier for each channel for a forward link of a conventional base station;

3A and 3B are diagrams illustrating a configuration of a 3: 5 switch unit in a redundant large-power amplifier sharing apparatus for each channel according to the present invention;

Figure 4 is a block diagram of a device for sharing a channel-specific redundant large power amplifier of a multi-channel base station according to the present invention.

<Explanation of symbols for main parts of drawing>

100: first front end 3: 5 switch unit 110, 210: 3: 4 switch

120,220: 1: 2 switch 130, 230: First and second shear couplers

140,240: first and second rear end 1: 2 switch 150,250: first and second rear end coupler

160,260: first and second rear 3: 4 switches

Hereinafter, an apparatus for sharing a redundant large power amplifier for each channel of the multi-channel base station of the present invention as described above will be described in detail with reference to the accompanying drawings.

4 is a block diagram of an apparatus for sharing a redundant large power amplifier for each channel of a multi-channel base station according to the present invention.

As shown in the drawing, the first front end 3: 5 switch unit 100 includes upconverters 30a, 30b and 30c of the upconverting unit 30 and respective HPAs 34a and 34b of the large power amplifier 34. And 34c in one-to-one correspondence, and share the HPAs 37 and 54 redundantly provided per channel to switch the paths under the control of the first path controller 170.

Since the 3: 5 switch unit is difficult to implement as a single component, it is implemented as shown in FIGS. 3A and 3B. As shown in FIG. 3A, the 3 and 5 switch unit includes a 3: 4 switch having three input pins and four output pins, and a 3: 4 switch receiving three outputs among the outputs of the 3: 4 switch. can do. In addition, as shown in FIG. 3B, the switch may be configured as a 3: 4 switch and a 1: 2 switch which receives one output pin of the output of the 3: 4 switch as an input.

Here, the first front end 3: 5 switch unit 100 has an output pin for connecting the output of each upconverter 30a, 30b, 30c to the HPA of each sector and an output pin for switching to the redundant HPA. 3: 4 switch 110; It is composed of a 1: 2 switch 120 for switching between one output of the 3: 4 switch 110 and each redundant HPA per channel to share the redundant HPA per channel.

The first shear combiner 130 has one output of the 1: 2 switch 120 in the first front end 3: 5 switch unit 100 and the 1: 2 switch 220 in the second front end 3: 5 switch unit 200. Combine the outputs of 1) so that the redundant R HPA 37 for the first channel is shared by the second channel redundant high power amplifier.

The first rear end 1: 2 switch 140 sends the output of the R HPA 37 redundantly provided for the first channel to the first rear end 3: 4 switch 160 and the second rear end 3: 4 switch 260. Switch with each provided path. The first rear end combiner 150 combines one output of the first rear end 1: 2 switch 140 and one output of the second rear end 1: 2 switch 240. The first rear stage 3: 4 switch 160 controls the first path control unit 170 between the HPAs 34a, 34b, and 34c of each sector, and the first rear coupler 150 and the respective filters 40a, 40b, and 40c. Switch under the control of.

The first path controller 170 monitors the states of the high power amplifier 34 and the R HPA 37 for the first channel, and transmits / receives state information with the second path controller 270 to control the path.

The above is a description of the configuration in which the redundant large power amplifier for the first channel shares the redundant large power amplifier for the second channel.

The configuration in which the redundant large power amplifier for the second channel shares the redundant large power amplifier for the first channel is also performed in the same manner as the configuration method of the redundant large power amplifier for the first channel.

Referring to the operation of the apparatus for sharing the redundant large power amplifier for each channel of the multi-channel base station according to the present invention as follows.

Each sector intermediate frequency signal on the forward link of the RF processor of the WLL base station is converted into a radio frequency signal through each sector up-converter 30a, 30b, 30c, and then each sector high power amplifier 34a, 34b, 34c is Each is amplified. Thereafter, other unnecessary radiation components are filtered out in the filter 40a, 40b, and 40c of each sector and then transmitted to the corresponding antenna.

First, when the HPAs 34a, 34b, and 34c of the high power amplifier 34 are normal, the first front end 3: 5 switch unit 100 outputs the output signals of the upconverters 30a, 30b, and 30c of each sector. Transmission to the corresponding HPA of the large power amplifier 34. In addition, the first rear stage 3: 4 switch 160 also transmits the output signal of the high power amplifier 34 to the corresponding filters 40a, 40b, and 40c.

If a failure occurs in the HPA on the normal path, the first front end 3: 5 switch unit 100 and the first rear end 3 are controlled by the first path control unit 170 which is continuously monitoring the state of the high power amplifying unit 34. The: 4 switch 160 switches the failed HPA.

That is, when a failure occurs in the αHPA 34a, the 3: 4 switch 110 of the first front 3: 5 switch unit 100 uses the output of the α up-converter 30a to use the redundant HPA 1 :. Switch to the path to two switches 120 and 1: 2 switch 120 to the path to R HPA 37. The first shear coupler 130 transmits the output signal of the 1: 2 switch 120 to the R HPA 37. The first rear end 1: 2 switch 140 connects the R HPA 37 and the first rear end coupler 150, which occur simultaneously with the switching operation of the first front end 1: 2 switch 130. Thus, a path through the upconverter 30a, the R HPA 37, and the α filter 40a is formed, and the R HPA 37 replaces the αHPA 34a.

On the other hand, when a failure occurs in the R HPA 37 provided in excess of the large power amplifier 34 of the first channel, the first path control unit 170 of the first front end 3: 5 switch unit 100 The: 2 switch 120 is controlled to switch to a path to the R HPA 57 provided redundantly to the large power amplifier 54 of the second channel. The first path controller 170 can determine whether the other R HPA is normal by transmitting and receiving state information with the second path controller 270. Thus, the path to the normal HPA can be controlled. Thus, the signal output from the α upconverter 30a is amplified by the R HPA 57 and then output to the α filter 40a through the first rear stage 3: 4 switch 160.

In order to share the redundant HPA per channel with each other, the output terminal of the redundant HPA has a 1: 2 switch (SPDT; Single Pole Double Through) and a coupler that combines the output of the 1: 2 switch for each channel to provide αHPA, βHPA, and γHPA. Since the difference between the signal power level of the path through and the signal power level of the path through the redundant HPA does not occur, the problem of having a separate device to compensate for the difference in power levels is solved.

The present invention can be applied to a base station harmonic processing unit such as a cellular mobile telephone system, a personal communication system, and an International Mobile Telecommunication in the year 2000 system.

As described above, an apparatus for sharing a redundant large power amplifier for each channel of a multi-channel base station according to the present invention includes a redundant high power amplifier for each channel in a radio frequency (RF) processor of the multi-channel base station. When sharing the amplifier (HPA) with each other, the output of the redundant HPA is separated by a 1: 2 switch, and the output of the redundant HPA for each channel is combined with a combiner to compensate for the signal loss difference between the normal transmission path and the redundant transmission path. .

In addition, due to the occurrence of the signal loss difference between the normal transmission path and the redundant transmission path, the device configuration cost can be reduced because a separate device is not required to compensate for the loss difference.

Claims (1)

In a harmonic processing (RF) processing unit of a multi-channel wireless subscriber network (WLL) system base station, an up-converting unit for converting an intermediate frequency of a forward link for each sector into a radio frequency, and a high power for amplifying the radio frequency for each sector. An amplifying unit, a redundant high power amplifier (HPA), a filtering unit for filtering unnecessary components in a power amplified signal for each sector, and the state of the high power amplifier unit to monitor the state of the upconverting unit In the apparatus for sharing a redundant large power amplifier for each channel by having a large power amplifier redundancy device comprising a channel control unit for controlling the path between the filter and the filter, The apparatus for sharing the extra large power amplifier for each channel, A path control unit for monitoring a state of the high power amplifier redundancy device for one channel and controlling a path by transmitting and receiving state information with a path control unit of the high power amplifier redundancy device for another channel; A 3: 4 switch for switching a path between the upconverting unit, the high power amplifier, and the redundant high power amplifier of the high power amplifier redundancy device for one channel under the control of the path controller; A front end 3: 5 switch consisting of a 1: 2 switch for switching between one of four switch outputs and a path connected to an extra large power amplifier provided in each channel-specific large power amplifier redundancy device; A rear stage 1: 2 switch for switching between the outputs of the redundant large power amplifiers and the paths to the filter units respectively provided in the channel-specific large power amplifier redundancy devices under the control of the path controller; A rear end combiner for combining one of the outputs of the rear end 1: 2 switch and one of the outputs of the rear end 1: 2 switch of the channel-specific large power amplifier redundancy device; And a rear stage 3: 4 switch for switching between the output of the high power amplifier and the output of the rear stage combiner and the filter unit under the control of the path controller, respectively. Device sharing it.