JPH0879151A - Base station distribution device - Google Patents

Abstract

PURPOSE: To distribute the signals of the radio frequency band of a base station over a wide range by means of a bidirectional repeater amplifier which repeats and amplifies the signals of the radio frequency band of the same frequency to be transmitted and received in both incoming and outgoing directions. CONSTITUTION: The incoming and outgoing directions are separated from each other by branch circuits 5 and 8A, and the amplifier circuits 6 and 7 amplify the signals. The amplified signals are bidirectionally repeated to a base station and other two base station distribution devices or a mobile station through the terminals 11 and 12A or an antenna terminal 12B. A base station distribution device 91A is provided with the input detection circuits 21 and 24 and output detection circuits 23 and 22. Then the gain of the circuit 6 or 7 is controlled by a control microcomputer 25 based on the detection results of those input and output detection circiuts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station distribution device for distributing and transmitting signals in a radio frequency band transmitted and received by base stations in a wide range.

[0002]

2. Description of the Related Art FIG. 10 shows a block diagram of a conventional bidirectional relay amplifier shown in, for example, Research Papers No. 37, published by The Institute of Electrical Communication, Nippon Telegraph and Telephone Public Corporation.
In the figure, (81) is a base station, (91) is a bidirectional relay amplifier, (82) is a mobile station, (83) is a base station antenna, (84) is a mobile station antenna, and (87) and (88). Is an antenna duplexer, (89) is a downstream amplification circuit for relaying and amplifying a signal from the base station (81), and (90) is an upstream circuit for relaying and amplifying a signal from the mobile station (82). Amplifier circuits (85) and (86) are connection terminals. Next, the operation will be described. The signal from the base station (81) received by the base station antenna (83) is demultiplexed by the antenna duplexer (87) through the connection terminal (85) and amplified by the downstream amplification circuit (89), It is re-radiated from the paired mobile station antenna (84) through the antenna duplexer (88) and the connection terminal (86) and is received by the mobile station (82). On the other hand, the signal from the mobile station (82) received by the mobile station antenna (84) is demultiplexed by the antenna duplexer (88) through the connection terminal (86) and amplified by the upstream amplification circuit (90). The antenna duplexer (87) and the connection terminal (85)
Is re-radiated from the base station antenna (83) and is received by the base station (81). In order to prevent oscillation due to wraparound inside or between antennas, it is essential that the isolation of the antenna duplexer is sufficiently large (60 dB or more). Therefore, in the conventional mobile communication system, the frequencies in the up direction and the down direction are allocated so as to be separated as much as possible from the required isolation.

[0003]

Since the conventional bidirectional relay amplifier is constructed as described above, it is essential that the frequencies of the radio frequency band signals in the up direction and the down direction are different and are appropriately separated. However, there is a problem that it cannot be applied when the signals of the radio frequency bands in the up direction and the down direction are completely the same frequency band such as the TDD system (time division simultaneous transmission / reception system) or the CDMA system. , No application was made to connect the bidirectional relay amplifiers in multiple stages to disperse signals from the base station. The present invention has been made in order to solve the above-mentioned problems, and bidirectionally relays and amplifies signals in the same radio frequency band such as TDD transmission / reception, and uses a structure such as a utility pole in a wide range. The purpose is to deploy.

[0004]

The base station dispersion device according to the present invention is installed in a building such as a utility pole, and is provided between the bidirectional relay amplifier and a base station having a single or a plurality of transceivers, or other By connecting the bidirectional relay amplifier with a high-frequency transmission cable, the service area of the base station can be expanded and the radio frequency can be effectively utilized, and the gain or output of the amplifier in the up and down direction signals can be achieved. By controlling the level or the relationship between input and output, it is possible to suppress unnecessary oscillation due to wraparound of signals in the radio frequency band such as the TDD system in which both the up and down radio frequencies are the same frequency. is there.

[0005]

According to the present invention, signals of radio frequency bands in the up and down directions from a base station having a single or a plurality of transceivers are transmitted to a building such as a utility pole or a building.
Alternatively, the two-way relay amplifiers installed on the overhead line extending between the buildings may be connected to each other by independent or common transmission means, and the two-way relay amplifiers may be provided with separate amplifiers for the up and down directions for amplification. Thus, unnecessary oscillation due to wraparound of signals of the TDD system or the CDMA system, in which both the upstream and downstream signals are in the same frequency band, can be suppressed and the service area of the base station can be expanded.

[0006]

Embodiments of the present invention will be described below.
FIG. 1 shows an installation example of a base station distribution device, (81) is a base station for transmitting and receiving signals in the same radio frequency band,
(91A) and (91B) are bidirectional relay amplifiers, (84A)
(84B) is an antenna for the mobile station, (92A) (92B)
Is a building such as a utility pole, and (13) and (14) are high-frequency transmission cables. The base station (81) is composed of a single or a plurality of transmitters and receivers that operate at the same frequency as in the TDD system and the like, and is combined at the radio side input / output terminals of the transceivers, and the high frequency transmission cable (13) is used. ) Is connected to the bidirectional relay amplifier (91A). The signal from the transmitter of the base station (81) is attenuated due to the loss of the high frequency transmission cable (13) and is connected to the bidirectional relay amplifier (91A) or is coupled by a directional coupler or the like. The bidirectional relay amplifier (91A) is attached to a building such as a telephone pole (92A), amplifies a signal from the base station and sends a part of the signal to the high frequency transmission cable (14) at the next stage and the mobile station. The antenna (84A) radiates to space, and conversely, the radio frequency band signal from the mobile station antenna (84A) is amplified by the bidirectional relay amplifier (91A), and the base station is transmitted through the high frequency transmission cable (13). (81). In this case, the amplification degree of the bidirectional relay amplifier (91A) and the transmission loss of the high frequency transmission cable (13) are set to almost the same value. On the other hand, the bidirectional relay amplifier (91B) is a termination type and operates in the same manner. FIG. 2 is a diagram showing an embodiment in which the base station distribution apparatuses of the present invention are connected in parallel,
(1) a branch circuit that connects a telephone line and branches an audio signal, (2) a radio frequency band TDMA / TDD system transmitter, (3) a radio frequency band TDMA / TDD system receiver, ( 4) (5) and (8) are branch circuits for branching signals in the radio frequency band, (6) are amplification circuits for signals in the downlink radio frequency band, and (7) are amplification in signals for the uplink radio frequency band. Circuit, (9) is a telephone line connection terminal, (10) is a radio frequency band signal connection terminal of the base station (81), (11) (1
2) (12A) and (12B) are bidirectional relay amplifiers (91
A) (91B) radio frequency band signal connection terminal, (84
A) and (84B) are antennas for mobile stations, and (13) and (14)
Is a high frequency transmission cable, and (15) is a coupler such as a directional coupler. The voice signal from the telephone line is branched by the branch circuit (1) into upstream and downstream voice signals, and the downstream voice signal is transmitted by the transmitter (2) to a radio frequency band TDMA / TDD signal (hereinafter radio frequency band). The signal in the radio frequency band in the upstream direction is converted into an audio signal by the receiver (3). Radio frequency band signals of the transmitter (2) and the receiver (3) are branched by a branch circuit (4) and connected to a connection terminal (1) via a common high frequency transmission cable (13) by a connection terminal (10).
1), is connected to the bidirectional relay amplifier (91A) in the directional coupler (15), is branched again in the up direction and the down direction by the branch circuit (5), and the down direction is the amplification circuit (6). ), The upstream direction is amplified by the amplifier circuit (7), branched by the branch circuit (8) and connected to the mobile station antenna (84A). One terminal of the directional coupler (15) is connected to the bidirectional relay amplifier (91B) at the next stage via the high frequency transmission cable (14). Similarly, the bidirectional relay amplifier (91B) is connected to the mobile station antenna (84B) by the branch circuit (8). If a skirt antenna is used for the mobile station antenna (84A), the bidirectional relay amplifier (91A) is housed in the coaxial portion of the skirt portion, so that the skirt portion serves as a sunshade.
A bidirectional repeater amplifier having excellent weather resistance can be realized. FIG. 3 is a diagram showing another embodiment in which the base station distribution apparatuses of the present invention are connected in parallel. (1) is a branch circuit for connecting a telephone line to branch a voice signal, and (2) is a wireless circuit. TD in the frequency band
MA / TDD transmitter, (3) TD in the radio frequency band
MA / TDD receiver, (4), (5), (8) are branch circuits for branching signals in the radio frequency band, (6) are amplifier circuits for signals in the downlink radio frequency band, and (7) are upstream Direction radio frequency band signal amplification circuit, (9) telephone line connection terminal, (10A) (10B) base station (81) radio frequency signal connection terminal, (11A) (11B) ( 12)
(12A) (12B) (12C) are connection terminals for signals in the radio frequency band of the bidirectional relay amplifiers (91A) (91B),
(84A) and (84B) are antennas for mobile stations, (13A)
(13B) (14A) (14B) are high frequency transmission cables, and (15A) (15B) are directional couplers. The voice signal from the telephone line is branched into the upstream and downstream voice signals by the branch circuit (1), and the downstream voice signal is transmitted by the transmitter (2) to the radio frequency band TDMA / TD.
Converted to a D signal (hereinafter referred to as a radio frequency band signal),
The radio frequency band signal in the up direction is converted into an audio signal by the receiver (3). The signal in the radio frequency band of the transmitter (2) is connected to the connection terminal (11A) via the independent high-frequency transmission cable (13A) by the connection terminal (10A), and is connected to the directional coupler (15A). Coupled to the downstream amplifier (6) of the bidirectional relay amplifier (91A), amplified and amplified by the branch circuit (8) to the mobile station antenna (84A).
It is connected to and radiated into space. On the other hand, the radio frequency band signal in the up direction is received by the mobile station antenna (84A), is branched by the branch circuit (8), is amplified by the up amplifier circuit (7), and is received by the directional coupler (15B). It is coupled to the high frequency transmission cable (13B) and connected to the receiver (3) of the base station (81) via the connection terminal (10B). One terminal of the directional couplers (15A) and (15B) is connected to the next-stage bidirectional relay amplifier (91B) via the high frequency transmission cables (14A) and (14B), and is amplified to the mobile station antenna (84B). ) Is connected to.
In the present embodiment, since the upstream and downstream amplifier circuits are sufficiently isolated, there is an advantage that there is little possibility of causing unnecessary oscillation due to wraparound. FIG. 4 is a diagram showing an embodiment in which the base station dispersion devices of the present invention are connected in series. (1) is a branch circuit for connecting a telephone line to branch an audio signal, and (2) is a radio frequency. Obi TDMA / T
DD transmitter, (3) TDMA / T in the radio frequency band
DD type receiver, (4) (5) (8) (8A) (8
B) is a branch circuit for branching the radio frequency band signal, (6) is an amplifier circuit for the downlink radio frequency band signal, (7) is an amplifier circuit for the uplink radio frequency band signal, and (9) is Telephone line connection terminal, (10) is a radio frequency band signal connection terminal of the base station (81), (11) (12) (12A) (12)
B) is a connection terminal for signals in the radio frequency band of the bidirectional relay amplifiers (91A) (91B), (84A) (84B) is a mobile station antenna, and (13) and (14) are high frequency transmission cables. The voice signal from the telephone line is branched into the upstream and downstream voice signals by the branch circuit (1), and the downstream voice signal is transmitted to the radio frequency band TD by the transmitter (2).
The signal is converted into an MA / TDD signal (hereinafter referred to as a radio frequency band signal), and the uplink radio frequency band signal is received by the receiver (3).
Is converted into an audio signal. The radio frequency band signals of the transmitter (2) and the receiver (3) are branched by the branch circuit (4) and connected to the connection terminal (10) via the common high frequency transmission cable (13). Connected to the
The branch circuit (5) again branches in the up direction and the down direction, the down direction is amplified by the amplifier circuit (6), the up direction is amplified by the amplifier circuit (7), and is branched by the branch circuit (8B). It is connected to the antenna (84A).
On the other hand, the output terminal (12A) of the branch circuit (8A) is connected to the next-stage bidirectional relay amplifier (91B) via the high-frequency transmission cable (14), and similarly, the branch circuit (8) connects the antenna to the mobile station antenna. (84B). In this embodiment, for example, the transmission loss of the high frequency transmission cable (11A) is amplified by the amplification circuit (6) of the bidirectional relay amplifier (91A), so that the output terminal (12A) has a base station (81).
Since it can be set to almost the same value as the output at the output terminal (10A) of, the bidirectional relay amplifier can be coupled in multiple stages. FIG. 5 is a diagram showing another embodiment in which the base station dispersion apparatuses of the present invention are connected in series, (1)
Is a branch circuit that connects the telephone line and branches the audio signal,
(2) is a TDMA / TDD system transmitter in the radio frequency band,
(3) is a radio frequency band TDMA / TDD receiver
(8) is a branch circuit for branching signals in the radio frequency band, (6)
Is a circuit for amplifying signals in the radio frequency band in the downward direction, (7) is a circuit for amplifying signals in the radio frequency band in the upward direction, (9) is a telephone line connection terminal, and (10A) and (10B) are base stations (81). )
Wireless frequency band signal connection terminal, (11A) (11B)
(12) (12A) (12B) (12C) are connection terminals for signals in the radio frequency band of the bidirectional relay amplifiers (91A) (91B), (84A) (84B) are antennas for mobile stations, and (1)
3A) (13B) (14A) (14B) are high frequency transmission cables. The voice signal from the telephone line is branched into the upstream and downstream voice signals by the branch circuit (1), and the downstream voice signal is converted into the radio frequency band TDMA / TDD signal by the transmitter (2), The directional radio frequency band signal is converted into an audio signal by the receiver (3). The radio frequency band signal of the transmitter (2) is independent of the high frequency transmission cable (13A) by the connection terminal (10A).
To the mobile terminal antenna (84A) by the branch circuit (8) after being connected to the connection terminal (11A), connected to the downstream amplifier (6) of the bidirectional relay amplifier (91A), and amplified. It is radiated into space. On the other hand, an upstream radio frequency band signal is received by the mobile station antenna (84A), is branched by the branch circuit (8), is amplified by the upstream amplification circuit (7), and is transmitted through the high frequency transmission cable (1).
3B) and is connected to the receiver (3) of the base station (81) via the connection terminal (10B). One terminal of each of the amplifier circuits (6) and (7) is branched into two and connected to the next-stage bidirectional relay amplifier (91B) via the high-frequency transmission cables (14A) and (14B), amplified, and moved in pairs. It is connected to the station antenna (84B). FIG. 6 shows the internal configuration of the bidirectional relay amplifier (91B) shown in FIG. 2, for example, (5) and (8) are circulators that branch in the up and down directions, and (6) and (7) are Amplifier circuit,
(31) and (32) are connection terminals of the amplifier circuit (6), and (2
1) (23) is an input level and output level detection circuit,
(33) (34) are connection terminals of the amplifier circuit (7), (2
2) (23) is an input level and output level detection circuit,
(25) is, for example, a control microcomputer having A / D and D / A converters, (11) is a connection terminal from the previous stage (coaxial connector, etc.), (12) is a connection terminal to the mobile station antenna (coaxial connector, etc.) ). The signal in the radio frequency band from the connection terminal (11) is branched downward by the circulator (5), amplified by the amplification circuit (6), branched through the circulator (8), and connected to the connection terminal (12).
Be led to. On the way, the respective signal levels are detected by the input level detection circuit (21) and the output level detection circuit (23). Similarly, a signal in the radio frequency band from the connection terminal (12) of the mobile station antenna is branched in the upstream direction by the circulator (8), amplified by the amplification circuit (7), and connected to the preceding stage through the circulator (5) ( 11). On the way, the respective signal levels are detected by the input level detection circuit (24) and the output level detection circuit (22). The detected input level and output level are compared by the control microcomputer (25), and the gains of the amplifier circuits (6) and (7) are controlled by the programmed procedure. A feature of the TDD system is that the transmission frequency and the reception frequency are the same, but transmission and reception are not performed simultaneously. That is, this feature is used because signals do not exist in the upstream direction and the downstream direction at the same time. The control circuit of the present invention is programmed so as to adaptively control the gains of the amplifier circuits (6) and (7) by taking advantage of the characteristics of the TDD system to eliminate the oscillation generated by the wraparound in the up and down directions. It Initially, the gain of the downstream amplification circuit (6) is set to a relatively small state, and the gain of the upstream amplification circuit (7) is set to a predetermined relatively large value. Next, assuming that the base station (81) is in the transmitting state and the mobile station (82) is in the receiving state, at the time when the downlink input level detection circuit (21) detects the signal from the base station (81). The gain of the amplifier circuit (6) is increased, the output is controlled so that the linearity of the amplifier circuit (6) is maintained, and at the same time, the gain of the amplifier circuit (7) in the up direction is decreased. The degree to which the gain of the amplifier circuit (7) is reduced is
The isolation of the circulator (8) or the degree of reflection from the next stage is adaptively estimated and determined from the difference between the output level detection circuit (23) and the input level detection circuit (24). Next, assuming that the mobile station (82) is in the transmitting state and the base station (81) is in the receiving state, the upstream amplifying circuit (7) unless the upstream output level detecting circuit (22) detects a signal. However, when the output level detection circuit (22) in the up direction detects a signal level higher than a certain value, the gain of the amplification circuit (7) in the up direction is decreased and at the same time, The gain of the amplifier circuit (6) is further reduced as compared with the standby state. The degree to which the gains of the amplifier circuits (6) and (7) are reduced depends on the value of the output level detection circuit (22) and the input level detection circuit (21).
From the difference between the two, the isolation of the circulator (5) or the degree of reflection from the previous stage is adaptively estimated and determined. As described above, the control of the gain of the amplifier circuits (6) and (7) is continuously performed adaptively, and even if the system is restarted after a power failure, it is set to start with the stored parameters. Works with. FIG. 7 is a diagram showing a specific example of the control microcomputer (25).
The control microcomputer (25) is called, for example, a DSP (digital signal processor), and
D converter (51) (52) (53) (54), D
/ A converter (55) (56), control circuit (5
7), a RAM (variable memory) (58), a ROM (fixed memory) (59) and the like. (35) (3
6), (37), (38), (39) and (40) are respective connection terminals, and the level detection circuits (21) (2) of FIG.
2) Outputs of (23) and (24) are terminals (35) and (37)
The gain control terminals of the amplifier circuits (6) and (7) are connected to the terminals (36) and (39).
The control of the control microcomputer (57) is executed by a program written in the ROM (59), and the control parameters of each circuit are stored in the RAM (58) and backed up by a battery. For example, the level detection circuit (2
When the analog output from 1) is applied to the terminal (35), it is converted into a digital signal by the A / D converter (51) and read into the control circuit (57). In this state,
When the input to the other ends (40) and (38) is equal to or less than the regulation value, the control circuit (57) outputs a level proportional to the level of the terminal (35) to the terminal (37). The gain of the amplifier circuit (6) is controlled via the converter (55). At the same time, the gain of the amplifier circuit (7) is reduced via the D / A converter (56). In this way, the procedure for controlling the gain of the amplifier circuits (6) and (7) is programmed according to the level states of the terminals (35) (37) (38) (40). The gain of the amplifier circuit (6) is G1 (dB), the gain of the amplifier circuit (7) is G2 (dB),
Isolate the circulator (5) to Y1 (d
B), circulator (8) isolation Y
If it is set to 2 (dB), a stable bidirectional relay amplifier can be realized by controlling the gains G1 and G2 so that the relationship of G1 + G2 <Y1 + Y2 always holds even when the isolation of the circulator changes. 8th
The figure is a block diagram of the bidirectional relay amplifier (91B) in FIG. 3, where (6) is a downstream amplification circuit, (7) is an upstream amplification circuit, and (8) is a branch circuit. . The amplifier circuits (6) and (7) are radio frequency band straight amplifiers, and are normally not required except for the linearity control of the downstream amplifier circuit (6). However, the gain is controlled by the control circuit (25) shown in FIG. More stable operation can be ensured by controlling. Ninth
The figure shows another embodiment of the present invention, in which the base station (8
1) Multiple transmitters (2A) (2B) and receivers (3A)
(3B) is provided, and the synthesizing circuits (16) and (17) individually synthesize the transmission and reception to connect the high frequency transmission cable (10A).
(10B). If the usage efficiency of the channel is defined as (traffic / channel), the call loss rate is 1% as follows.
As shown in the example in the case of
It can be seen that the channel utilization efficiency is improved when the MA / TDD transceiver is combined. For 4 channels: Channel usage efficiency is 11% (1 of which is
Channel is for control. 8 channels: Channel utilization efficiency is 31% (1 of which is 1)
Channel is for control) 12 channels: Channel utilization efficiency is 46% (1 channel is for control) 16 channels: Channel utilization efficiency is 50% (1 channel is for control) For example, 4 channels There are 4 base stations and 1
Comparing the case where the input / output of the base station of 6 channels is distributed to 4 places by the base station distribution device of the present invention, 4 channels are installed at 4 places: channel utilization efficiency is 11
% 16 channels are distributed to 4 locations: Channel usage efficiency is 5
It is 0%, and the channel utilization efficiency is improved by 4.5 times, which is a great effect. If the base stations are distributed, 1
Since the service area per base station can be reduced, the effect of delay dispersion and the like can be reduced. In the above description, the level detection circuit is provided at both the input terminal and the output terminal of the amplifier circuit, but the same effect can be obtained even if a part of the amplifier circuit is omitted, and a level detection circuit is provided in the middle of the amplifier circuit. Even if connected, the same effect can be obtained. Also, the control microcomputer is not a DSP but a normal microcomputer and a D / A A
It can be realized by combining a / D converter or by configuring with a normal logic circuit, and an example of the control procedure is also shown, but various control procedures such as adaptive control procedure utilizing learning method or fuzzy control procedure are also available. Can be considered. Further, although it has been described that the antenna for the mobile station and the bidirectional relay amplifier are integrated, the same effect can be obtained even if the antenna is housed in another case. Further, although the circulator is used for the branch circuit of the signal in the radio frequency band, the same effect can be obtained by a changeover switch, a combiner, or a two-way divider. It is also possible to perform bidirectional relay amplification by providing only the up and down amplification circuits without providing a branch circuit to the mobile station antenna in the bidirectional relay amplifier. In addition, it is conceivable that the transmission means may be shared with the transmission of CATV or the like, or an optical cable, a same-wave tube, a surface line, a parallel line or the like may be used. Further, the case where the base station dispersion apparatus of the present invention is installed on a telephone pole or the like has been described, but the same effect can be obtained by installing the base station dispersion apparatus on a building such as a building, a natural object, or an overhead line stretched between them.

[Advantages of the Invention] Since the present invention is configured as described above, it is possible to economically realize a device for dispersing a signal in a radio frequency band of a base station over a wide area, and yet an antenna for a mobile station. Even if the isolation of the circulator changes due to a change in impedance of the circuit, there is an effect that unnecessary oscillation of the amplifier circuit can be removed. In addition to this, QPSK is controlled by controlling the linearity of the downstream amplification circuit.
It is possible to prevent the sideband wave of the linearly modulated wave from spreading.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an installation example of a base station distribution device of the present invention.

FIG. 2 is a configuration diagram showing an embodiment in which the base station distribution apparatuses of the present invention are connected in parallel.

FIG. 3 is a configuration diagram showing another embodiment in which the base station distribution apparatuses of the present invention are connected in parallel.

FIG. 4 is a configuration diagram showing an embodiment in which the base station dispersion devices of the present invention are connected in series.

FIG. 5 is a configuration diagram showing another embodiment in which the base station distribution apparatuses of the present invention are connected in series.

FIG. 6 is a block diagram showing an embodiment of the internal structure of the bidirectional relay amplifier of the present invention.

FIG. 7 is a configuration diagram showing an embodiment of a control microcomputer of the present invention.

FIG. 8 is a configuration diagram showing another example of the internal structure of the bidirectional relay amplifier of the present invention.

FIG. 9 is a block diagram showing another embodiment of the base station of the present invention.

FIG. 10 is a system configuration diagram showing an example of a conventional bidirectional relay amplifier.

[Explanation of symbols]

1 Telephone line interface (branch circuit) 2 Radio frequency TMDA /
TDD transmitter 3 Radio frequency TMDA /
TDD receiver 4, 5, 8, 8A, 8B Branch circuit 6 Downward amplification circuit 7 Upward amplification circuit 9 Telephone line connection terminal 10, 10A, 10B Radio frequency signal input / output terminal of base station 11, 11A, 11B Bidirectional relay amplifier input terminal 12, 12A, 12B, 12B Bidirectional relay amplifier output terminal 13, 14, 13A, 13B, high frequency transmission cable 14A, 14B Same as above 15, directional coupler 16, 17 Radio frequency band synthesizer 21 , 24 Input level detection circuit 22, 23 Output level detection circuit 30 Downstream input level detection circuit connection terminal 31, 32 Downstream amplification circuit connection terminal 33, 34 Upstream amplification circuit connection terminal 35, 40 Input Output terminals of the level detection circuit 37, 38 Output terminals of the output level detection circuit 36 Control terminals of the downstream amplification circuit 3 Control terminal 41, 42 of input circuit for input level detection circuit in upstream direction 51-54 A / D converter 55, 56 D / A converter 57 Control circuit 58 RAM 59 ROM 81 Base station 82 Mobile station 83, 83A, 83B Antenna for base station 84, 84A, 84B Antenna for mobile station 85, 86 Connection terminal for bidirectional relay amplifier 87, 88 Antenna duplexer 89 Downlink relay amplifier circuit 90 Uplink relay amplifier circuit 91, 91A, 91B Bidirectional relay amplifier

[Procedure amendment]

[Submission date] March 14, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Base station distribution device

[Claims]

[Requirement 9] A base station having a single or a plurality of transceivers operating at the same frequency such as a TDD system or a CDMA system, and a synthesizing unit for synthesizing input / output signals of at least radio frequency bands of the transceivers. The signal of the same radio frequency band in the up direction and the down direction of the base station is connected via individual or common radio frequency transmission means. The base station distribution device according to item 3.

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station distribution device for distributing and transmitting signals in a radio frequency band transmitted and received by base stations in a wide range.

[0002]

2. Description of the Related Art FIG. 10 shows a block diagram of a conventional bidirectional relay amplifier shown in, for example, Research Papers No. 37, published by The Institute of Electrical Communication, Nippon Telegraph and Telephone Public Corporation.
In the figure, (81) is a base station, (91) is a bidirectional relay amplifier, (82) is a mobile station, (83) is a base station antenna, (84) is a mobile station antenna, and (87) and (88). Is an antenna duplexer, (89) is a downstream amplification circuit for relaying and amplifying a signal from the base station (81), and (90) is an upstream circuit for relaying and amplifying a signal from the mobile station (82). Amplifier circuits (85) and (86) are connection terminals. Next, the operation will be described. The signal from the base station (81) received by the base station antenna (83) is demultiplexed by the antenna duplexer (87) through the connection terminal (85) and amplified by the downstream amplification circuit (89), It is re-radiated from the paired mobile station antenna (84) through the antenna duplexer (88) and the connection terminal (86) and is received by the mobile station (82). On the other hand, the signal from the mobile station (82) received by the mobile station antenna (84) is demultiplexed by the antenna duplexer (88) through the connection terminal (86) and amplified by the upstream amplification circuit (90). The antenna duplexer (87) and the connection terminal (85)
Is re-radiated from the base station antenna (83) and is received by the base station (81). In order to prevent oscillation due to wraparound inside or between antennas, it is essential that the isolation of the antenna duplexer is sufficiently large (60 dB or more). Therefore, in the conventional mobile communication system, the frequencies in the up direction and the down direction are allocated so as to be separated as much as possible from the required isolation.

[0003]

Since the conventional bidirectional relay amplifier is constructed as described above, it is essential that the frequencies of the radio frequency band signals in the up direction and the down direction are different and are appropriately separated. And TDD (Time Divis
Ion Duplex) method or CDMA (Cod
e Division Multiple Acces
There is a problem that it cannot be applied when the signals of the radio frequency band in the up direction and the radio frequency band in the down direction are completely the same frequency band such as the s) method, and the bidirectional relay amplifier is connected in multiple stages. It has not been applied to disperse signals from base stations. The present invention has been made in order to solve the above-mentioned problems, and bidirectionally relays and amplifies signals in the same radio frequency band such as TDD transmission / reception, and uses a structure such as a utility pole in a wide range. The purpose is to deploy.

[0004]

Means for Solving the Problems] utility pole base station dispersing apparatus according to the present invention, the Birudeingu, buildings such as an underground mall Oh
Or, it is installed on the overhead line stretched over them, and between the bidirectional relay amplifier and the base station having a single or a plurality of transmitters and receivers, or another bidirectional relay amplifier. By connecting high-frequency transmission means between the two, the service area of the base station is expanded and the effective use of radio frequencies is planned .
It Further, in an amplifier that amplifies a signal in an up or down radio frequency band, the gain or output of the amplifier or the relationship between the input and the output is controlled so that both the up and down radio frequencies are the same. Frequency FDMA / TDD, TDMA / TDD, or
Even in the CDMA system or the like, it is possible to suppress unnecessary oscillation due to the sneak of signals in the radio frequency band.

[0005]

In the present invention, a single transmitter or a plurality of transmitters
And the radio frequency band signals in the up and down directions from the base station that has the receiver , the utility pole , inside the building, underground
Separate or common high frequencies to bidirectional repeater amplifiers installed in buildings such as towns or overhead lines
More connected to the transmission means, said by amplifying provided upstream and downstream directions respectively separately amplifiers in the bidirectional amplifier repeater, FDMA / TDD uplink and downlink radio frequencies are both the same frequency, TDMA /
A signal in a radio frequency band such as TDD or CDMA system can be amplified by suppressing unnecessary oscillation due to wraparound.
The service area of the base station can be expanded.

[0006]

Embodiments of the present invention will be described below.
FIG. 1 shows an installation example of a base station distribution device,(81) is
base station,(91A) and (91B) are bidirectional relay amplifiers,
(84A) and (84B) are antennas for mobile stations, (92A)
(92B) is a building such as a telephone pole, (13) (14)(1
5) is high frequency transmission means, (82) are mobile stations or terminals
apparatusIs. The base station (81)FDMA / TDD, TD
MA / TDD or CDMA system (hereinafter TDD system
Called)There is a single that operates at the same frequency
It consists of multiple transmitters and receivers.
Combined at the wireless input / output terminal,High frequency transmission means (13)
Is connected to the bidirectional relay amplifier (91A).
High frequency transmission meansOf the base station (81) due to the loss of (13)
The signal from the transmitter is attenuated and the bidirectional relay amplifier is used.
(91A). Bidirectional relay amplifier (91A)
Is attached to a building such as a telephone pole (92A).
The base station(81)Signal from the mobile station is amplified.
Radiated from Na (84A) into the spaceRadio frequency band
Signal of the next stageHigh frequency transmission means (14). Reverse
To the mobile station antenna (84A)Or (84B)
RanoRadio frequency bandSignal is bidirectional relay amplifier (91A)
Is amplified byHigh frequency transmission means (13)Through the base station
To (81)Is transmitted.In this case, a bidirectional relay amplifier
With the amplification of (91A)High frequency transmission means (13)Transmission loss
Losses are set to almost the same value. On the other hand, bidirectional relay amplifier
(91B)Is similarWorks, butSome high-frequency band signal
No. to leaky coaxial cable or leaky antenna (15)
Sent.FIG. 2 shows a parallel arrangement of the base station distribution device of the present invention.
It is a figure which shows one Example at the time of connecting, (1) is a telephone
Branch circuit that connects the line and branches the audio signal, (2) is not
Line frequency bandSuch as TDD methodTransmitter, (3) radio frequency
Several bandsTDD methodNo receiver, etc., (4) (5) (8)
A branch circuit for branching signals in the line frequency band, (6) going down
Amplification circuit for signals in the radio frequency band, (7) is upstream
Radio frequency band signal amplification circuit, (9) is for telephone line
Connection terminal, (10) is a radio frequency band of the base station (81)
Signal connection terminal, (11) (12) (12A) (12
B) is the radio frequency of the bidirectional relay amplifier (91A) (91B).
Connection terminal for signals in the wavenumber band, (84A) (84B-1)
(84B-2)Is a mobile station antenna, (13) (14)
(15)IsHigh frequency transmission means, (43) is a directional coupler, etc.
Is a combiner.Voice signal from the telephone line is a branch circuit
It is split into upstream and downstream audio signals by (1).
And the downstream audio signal is transmitted by the transmitter (2)By TDD
Radio frequency band such as methodSignal (hereinafter radio frequency band signal
Is called) and the radio frequency band in the upstream directionTD
From signals such as D systemConverted to audio signal by receiver (3)
To be done. Radio frequency from transmitter (2) and receiver (3)
The band signal is branched by the branch circuit (4) and connected to the connection terminal.
Common by (10)High frequency transmission means (13)Via
To the connection terminal (11)More bidirectional relay amplifier (91A)
Connected by the directional coupler (43),Minute
The branch circuit (5) again splits the upstream and downstream directions.
Amplification circuit (6) in the down direction, amplification in the up direction
Amplified by circuit (7) and branched by branch circuit (8)
And is connected to the mobile station antenna (84A).wireless
The remaining part of the signal in the frequency band is the connection terminal (12A)
And high-frequency transmission means (14)Next-stage bidirectional relay via
It is connected to the amplifier (91B). Similarly, increase in two-way relay
In the width device (91B)The rest of the radio frequency band signal
A leaky coaxial cable or a connection terminal (12A)
Leakage antenna (single or continuous radiation element with ground plane
(15) Antenna for high-frequency transmission line with child
Connected.Leaky coaxial cable or leaky antenna
(15) is connected to the mobile station (82) with a stable coupling coefficient.
Are radiated in the direction perpendicular to the
Play the role of the ground plane or have the ground plane itself
And form a strong antenna against standing waves.Mobile station Ann
Tena (84A)Integrated with bidirectional relay amplifier (91A)
Small size byIncreased bidirectional relay with excellent weather resistance
Width can be realized. FIG. 3 is a base station distribution apparatus of the present invention.
It is a diagram showing another example of the case of connecting in parallel,
(1) is a branch circuit that connects the telephone line and branches the audio signal.
, (2) is the radio frequency bandSuch as TDD methodTransmitter,
(3) is the radio frequency bandTDD method, etc.Receiver, (4)
(5) and (8) are branch circuits that branch signals in the radio frequency band.
(6) is the amplification frequency of the signal in the radio frequency band in the down direction
, (7) is the amplification frequency of the signal in the upstream radio frequency band
, (9) is a telephone line connection terminal, (10A) (10
B) is the base station (81)Up and down radio frequencies
Several bandsSignal ofIndividualConnection terminal, (11A)(11B)
(12A)(12B) (12C) (12D) is bidirectional
Of the amplifier (91A) (91B)Up and down
Radio frequency bandSignal ofIndividualConnection terminal, (84A)(8
4B-1) (84B-2)Mobile station antenna, (13
A) (13B) (14A) (14B)(15A) (15
B)IsHigh frequency transmission means,(43A) and (43B)Direction
It is a combiner. Voice signal from the telephone line is a branch circuit
It is split into upstream and downstream audio signals by (1).
And the downstream audio signal is transmitted by the transmitter (2).TDD
Method etc.Signals in the radio frequency band of
Signals in the line frequency band are converted to audio signals by the receiver (3)
To be done. Radio frequency band signal of transmitter (2)
Independent by child (10A)High frequency transmission means(13A)
Connected to the connection terminal (11A) via the directional coupler
To (43A)How to go down the bidirectional relay amplifier (91A)
To the amplifier (6)Combined,Amplified branch circuit
Connected to the mobile station antenna (84A) by (8)
It is radiated into space. On the other hand, the radio frequency band signal in the up direction
Is received by the pair of mobile antennas (84A), and the branch circuit
It is branched by (8) and it is branched by the upstream amplifier circuit (7).
Amplified and directional coupler(43B)ByHigh frequency transmission hand
Step (13B) via the connection terminal (10B)
Connected to the receiver (3) of the base station (81)In addition,
One terminal of the directional coupler (43A) (43B) is high frequency
Bidirectional in the next stage via transmission means (14A) (14B)
The directional coupler (43) is connected to the relay amplifier (91B).
A) is bound by (43B),Amplified to mobile station
Antenna(84B-1) (84B-2)Connected to.versus
Between the mobile station antennas (84B-1) (84B-2),
Greater isolation than branch circuit (8)
Therefore, there is an advantage that more stable amplification can be performed.In this example
Is sufficiently isolated from the upstream and downstream amplifier circuits
Is generated, causing unnecessary oscillation due to wraparound.
It has the advantage of being less likely to occur. Figure 4 is the base of this invention
FIG. 3 is a diagram showing an example in which station distribution devices are connected in series.
Yes, (1) is the amount to branch the audio signal by connecting the telephone line
Branch circuit, (2), is the radio frequency bandSuch as TDD methodSend
Machine, (3) is the radio frequency bandSuch as TDD methodReceiving machine,
(4) (5) (8) (8A) (8B) is a radio frequency band
A branch circuit for branching the signal, (6) is a radio frequency in the downward direction
Amplification circuit for signals in several bands, (7) Radio frequency in the up direction
Band signal amplification circuit, (9) telephone line connection terminal,
(10) is the base station (81) is the connection of signals in the radio frequency band
Terminal, (11) (12) (12A) (12B) bidirectional
Radio frequency band signals of relay amplifiers (91A) (91B)
Connection terminals,(84A) isMobile station antenna, (13)
(14) isHigh frequency transmission means, (15) is a leaky coaxial cable
Or leaky antennaIs. Voice signal from telephone line
No. 1 is the branch circuit (1) for upstream and downstream voice
The signal is branched into the signal and the downstream audio signal is sent to the transmitter (2).
Therefore, it is converted to a radio frequency band signal, and
The frequency band signal is converted into an audio signal by the receiver (3).
Be done. Radio frequency band signals of transmitter (2) and receiver (3)
Signal is branched by the branch circuit (4) and the connection terminal (1
0) commonHigh frequency transmission meansConnect via (13)
It is connected to the connection terminal (11) and re-connected by the branch circuit (5).
And an amplifier circuit in the down direction.
By (6), the up direction is amplified by the amplifier circuit (7).
And is branched by the branch circuit (8B) to the mobile station antenna.
(84A). On the other hand, the branch circuit (8A)
Output terminal (12A)High frequency transmission meansVia (14)
Connected to the next-stage bidirectional relay amplifier (91B)
To the branch circuit (8)High frequency leakage cable or
For leaky antenna (15)Connected. In this example, an example
For exampleHigh frequency transmission means(11A) transmission loss is bidirectional relay
It is amplified by the amplifier circuit (6) of the amplifier (91A)
At the output terminal (12A), the output terminal of the base station (81)
At (10A)Transmission outputCan be almost the same value as
Therefore, it is possible to combine multi-way relay amplifiers in multiple stages.
I can do it. FIG. 5 shows the base station dispersion device of the present invention connected in series.
It is a figure which shows the other Example when continuing, (1) is a telephone
Branch circuit that connects the line and branches the audio signal, (2) is not
Line frequency bandSuch as TDD methodTransmitter, (3) radio frequency
Several bandsReceiver such as TDD system,(6) is radio in the down direction
Frequency band signal amplification circuit, (7) Uplink radio frequency
Amplification circuit for wave number signals, (9) is the connection end of telephone line
Child, (10A) (10B) is the radio frequency of the base station (81)
A few bands of signalsUp and downConnection terminal, (11
A)(11B) (12A) (12B) (12C) (12
D)Of the bidirectional relay amplifier (91A) (91B)Wireless
Wave number bandSignal ofUp and downConnecting terminal,(84
A-1) (84A-2)Mobile station antenna, (13
A) (13B) (14A) (14B)High frequency transmission hand
Steps (15A) and (15B) are leaky coaxial cables or
With leaky antennais there. Voice signal from telephone line is branched
Split into upstream and downstream audio signals by path (1)
And the downlink audio signal is transmitted by the transmitter (2).
Converted to a signal in the frequency band,
The signal is converted into an audio signal by the receiver (3). Send
The signal in the radio frequency band of the machine (2) is connected to the connection terminal (10A).
Independence by TakashiWave transmission means (13A) connection
Connected to the terminal (11A), the bidirectional relay amplifier (91
Connected to the downstream amplifier (6) of A),Amplified
Mobile stationAntenna(84A-1)Connected to and released into space
Is shot. On the other hand, signals in the radio frequency band in the up direction are for mobile stations.
antenna(84A-2) received in uplinkAmplifier circuit
Amplified by (7),High frequency transmission meansContact (13B)
Continued via the connection terminal (10B) to the base station (81)
Connected to the receiver (3). Amplifier circuit (6) (7)
One terminal is branched into two,High frequency transmission means
(14A) (14B) through the next stage bidirectional relay amplifier
Connected to (91B) and amplifiedLeaky coaxial cable
Rui Leaky antenna (15A-1) (15A-2)Contact
Continued.The loss due to high frequency transmission means is
Multi-stage connection may be used for amplification, radio frequency of base station
Signals in several bands can be dispersed over a wide range.Figure 6 is an example
IfIn Figure 4Bidirectional relay amplifier shown(91A)Internal structure of
Showing success (5)(8A) (8B)Up and down
Circulators that branch towards (6) (7)Going up
Direction and downAmplifier circuit, (31) and (32) are amplification circuits
The connection terminal of the path (6), (21) and (23) are at the input level.
And output level detection circuit, and (33) and (34) are amplification circuits
Connection terminals of (7), (22) and (23) are input level and
And output level detection circuit, (25) is A / D, D / A converter
For example, a control microcomputer having a barter, (11) is a front
Connection terminal (coaxial connector, etc.) from the step,(43A)
(43B) is a two-branch circuit, (12A) (12B)Is a transition
It is a connection terminal (coaxial connector, etc.) to the mobile station antenna.
It From the connection terminal (11)Radio frequency bandThe signal is
Amplification circuit branched in the downward direction by the curator (5)
Amplified by (6)It is bifurcated by (43A),
circulator(8A) (8B)Branched through
Continuation terminal(12A) (12B)Be guided. On the way,
Bell detection circuit (21) and output level detection circuit (2
Similar to 3) each signal level is detected
To the mobile terminal antenna connection terminal(12A) (12B)
fromRadio frequency bandSignal of the circulator(8A)
(8B)Is branched in the upward direction by, (43A) (43
Bifurcated by B)Amplified by amplifier circuit (7)
Connection terminal to the previous stage through the circulator (5)
Guided by (11). On the way, the input level detection circuit (2
4) and the output level detection circuit (22)
These signal levels are detected. The detected input level
And the output level are compared by the control microcomputer (25).
And the amplification circuit (6) and
The gain of (7) is controlled. As a feature of the TDD method,
The transmission frequency and the reception frequency are the same, but the transmission and reception are the same.
Sometimes it's not done. That is, in the up and down direction
This feature is used because no signal is present at the same time.
To use. The control circuit of the present invention is characterized by this TDD method.
The gain of the amplifier circuits (6) and (7)
By controlling it in the tape,
It is programmed to eliminate the oscillations that occur. Most
At first, the gain of the downstream amplification circuit (6) is relatively small.
Is set to the state, and the gain of the amplifier circuit (7) in the up direction is
The profit is set to a predetermined relatively large value.
Next, the base station (81) is in a transmitting state and the mobile station (82)
Is in the receiving state, the input level detection in the downward direction is detected.
When the circuit (21) detects a signal from the base station (81)
At this point, the gain of the amplifier circuit (6) is increased,
If the output is controlled so that the linearity of (6) is maintained,
At times, the gain of the amplifier circuit (7) in the up direction is reduced.
The degree to which the gain of the amplifier circuit (7) is reduced depends on the output level.
The value of the detection circuit (23) and the input level detection circuit (24)
There is a circulator (8) isolation from the difference
Or decide adaptively by estimating the degree of reflection from the next stage
Meru. Then the mobile stationOr terminal device(82) is the transmittal letter
If the base station (81) is in a receiving state,
The output level detection circuit (22) in the reverse direction does not detect the signal.
The gain of the amplifier circuit (7) in the upward direction remains high
The output level detection circuit (22) in the upstream direction is kept
When a signal level above a certain specified value is detected
The gain of the width circuit (7) is reduced and at the same time, the gain in the down direction is increased.
The gain of the width circuit (6) is further reduced compared to the standby state.
The degree to which the gain of the amplifier circuits (6) and (7) is reduced depends on the output.
The value of the level detection circuit (22) and the input level detection circuit (2
Isolation of circulator (5) from the difference of 1)
Or adaptively estimate the degree of reflection from the previous stage
And decide. As described above, the gain of the amplifier circuits (6) and (7)
Control is continuously performed adaptively and restarts after a power failure.
Starts with stored parameters even when moving
Is always set to operate in the optimum state. First
FIG. 7 is a diagram showing a specific example of the control microcomputer (25).
It The control microcomputer (25) is, for example, a DSP (data
Digital signal processor),
A / D converter (51) (52) (53) (5
4), D / A converter (55) (56), control circuit
(57), RAM (variable memory) (58), ROM
(Fixed memory) (59) and the like. (35)
(36) (37) (38) (39) (40) are respectively
And the level detection circuit (21) of FIG.
The outputs of (22), (23) and (24) are the terminals (35) and (3).
7) (38) (40) connected to the amplifier circuit (6)
The gain control terminal of (7) is connected to terminals (36) and (39)
To be done. The control of the control microcomputer (57) is performed by the ROM (5
Each time executed by the program written in 9)
The road control parameters are stored in the RAM (58).
Backed up by battery. For example, level detection times
The analog output from line (21) is applied to terminal (35).
Then, the digital signal is output by the A / D converter (51).
And is read by the control circuit (57). This state
When the input to the other end (40) (38) is less than the specified value
The control circuit (57) is proportional to the level of the terminal (35).
The D / A converter so that the selected level is output to the terminal (37).
Control the gain of the amplifier circuit (6) via the barter (55)
To do. At the same time, via the D / A converter (56)
Then, the gain of the amplifier circuit (7) is reduced. Like this
The level of each terminal (35) (37) (38) (40)
A method of controlling the gain of the amplifier circuits (6) and (7) according to the state.
The order is programmed. Set the gain of the amplifier circuit (6) to G
1 (dB), the gain of the amplifier circuit (7) is G2 (dB),
Isolate the curator (5) to Y1 (d
B), circulator (8) isolation Y
If 2 (dB), the relationship of G1 + G2 <Y1 + Y2
But when the isolation of the circulator changes
However, the gains G1 and G2 should be controlled so that they always hold.
A stable bidirectional repeater amplifier can be realized by and. Figure 8
Figure(A) and (B) are bidirectional relay amplifiers in FIG.
(91A) of (91B)It is a block diagram, (11A) (1
1B) (12A) (12B) (12C) (12D)
Another connection terminal,(6) is a downstream amplifier circuit, (7) is
Upward amplification circuit,(43A) and (43B) are two branch times
RoadIs.With this bidirectional relay amplifier,
Stable operation is ensured because the directions can be completely separated.
it can. Also, when combining multiple transceivers, each transceiver
Transmitter simply by changing the frequency without synchronizing the machines
The sensitivity suppression from the receiver to the receiver can be greatly improved by this method.
There is an advantage.Amplifier circuits (6) and (7) are in the radio frequency band
Straight amplifier, downstream amplification circuit (6)
Except for the linearity control ofNormally the control circuitNo, but no
If the gain is controlled by the control circuit (25) shown in FIG.
Stable operation can be secured. FIG. 9 shows another example of the present invention.
FIG. 3 is a diagram showing an embodiment, in which a base station (81) has a plurality of transmitters.
(2A) (2B) and receivers (3A) (3B) are installed and
Synthesized individually by the composing circuit (16) (17)High-frequency transmission
Of sending meansIt is connected to the connection terminals (10A) and (10B).
Channel utilization(Erlan / Channel) andDefine
Then, as shown in the example below with a call loss rate of 1%,
Combining a number of 4-channel TDMA / TDD transceivers
If you ask for the channel utilization efficiencyGreatly efficient use
ToIt can be seen that it will be improved.In the above, the transceiver
Although the case of two units was described, the number of transceivers is large.
The efficiency of use of channels is higher, but about 20 channels
4 channels of TDMA / TD because saturation begins at
4 transceivers of D are combined as one set and distributed in various directions.
Is economical. For 4 channels: Channel usage efficiency is 11% (1 of which is
Channel control) 8 channels: Channel usage efficiency is 31% (1 of which is 1)
Channel control) For 12 channels: Channel usage efficiency is 46% (of which
For 1 channel control) 16 channels: Channel utilization efficiency is 50% (of which
For 1-channel control) For example, if four-channel base stations are provided at four locations, 16
Input / output of the base station of the channel to the base station distribution device of the present invention
Compared to the case of distributing to 4 places, 4 channels are installed in 4 places: Channel utilization efficiency is 11
% 16 channels are distributed to 4 locations: Channel usage efficiency is 5
0%, improving channel utilization efficiency by 4.5 times
The effect is great. If the base stations are distributed, 1
Is it possible to reduce the service area per base station?
Therefore, there is an effect that the influence of delay dispersion and the like can be reduced. Since
In the above explanation, what the input terminal and output terminal of the amplifier circuit is
A level detection circuit is also provided for these, but even if some are omitted, the same
Similar effects are obtained, and level detection is performed in the middle of the amplifier circuit.
Similar effects can be obtained by connecting circuits.Also the signal
Instead of detecting the level, it is modulated by a digital signal.
Signal in the specified radio frequency band is detected, and the
Parameter such as digital signal eye pattern or
The effect can be expected even if the I / Q signal or the like is detected.In addition,
The target microcomputer is not a DSP but a normal microcomputer D / A
Combine A / D converter or use normal logic
It can be realized by a method such as configuring with a circuit.
However, one example was shown, but adaptation using learning techniques
Various control procedures, fuzzy control procedures, etc.
Can be considered. Also, increase the number of bidirectional relays with the antenna for mobile stations.
I explained that the width device is integrated, but store it in another case
Also has the same effect. Also,Radio frequency bandSignal of
A circulator was used for the branch circuit,Ha
Hybrid circuits, directional couplers, electronic switches or
For distributorsTherefore, the same effect can be obtained. Also, Takashi
An external conductor is connected to the wave transmission means or the mobile station antenna.
A leaky coaxial cable or a leaky waveguide that acts as a plate,
Alternatively, it has a ground plane and a single or continuous radiating element.
Leaky antenna consisting of high-frequency transmission line, or transfer
Patch with ground plane or reflector as mobile station antenna
Antenna, corner reflector, or parabola
By using an antenna, etc., communication that is strong against standing waves can be achieved.
Can be secured. It also suppresses data errors due to transmission delay.
In order to obtain a directional antenna for the mobile station antenna,
Install with directivity in the direction of signal transmission in the radio frequency band
Then it is effective.Also,High frequency transmission meansCATV, etc.
It can be used in common with the transmission of signals in other radio frequency bands,
A separate oscillator for a local oscillator is providedMixing
handRadio frequency bandThe frequency of the signal of
It is possible to transmit the section of the stage and restore it again with the bidirectional relay amplifier.
By,Increased utilization efficiency of high-frequency transmission means
RiMethods such as reducing transmission loss can be considered.Also high
Both from the base station side or the opposite direction through frequency transmission means
Bidirectional repeater increase by supplying power to the repeater amplifier
It becomes possible to make the width device unpowered.Also, for the base station of the present invention
I explained the case of installing the distribution device on the utility pole.
In the dayofEach floor, natural productStretched between these
On overhead lines or in underground mallsEven if installed in
To be

[0007]

Since the present invention is configured as described above, it is possible to economically realize a device for dispersing a signal in the radio frequency band of a base station over a wide area, and to reduce the impedance of the antenna for a mobile station. Even if the isolation of the circulator changes due to a change or the like, there is an effect that unnecessary oscillation of the amplifier circuit can be removed. In addition to this, there is an effect such that the linearity of the downstream amplification circuit can be controlled to prevent the sideband wave of the linearly modulated wave such as QPSK from spreading.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an installation example of a base station distribution device of the present invention.

FIG. 2 is a configuration diagram showing an embodiment in which the base station distribution apparatuses of the present invention are connected in parallel.

FIG. 3 is a configuration diagram showing another embodiment in which the base station distribution apparatuses of the present invention are connected in parallel.

FIG. 4 is a configuration diagram showing an embodiment in which the base station dispersion devices of the present invention are connected in series.

FIG. 5 is a configuration diagram showing another embodiment in which the base station distribution apparatuses of the present invention are connected in series.

FIG. 6 is a configuration diagram showing an embodiment of the internal structure of the bidirectional relay amplifier of the present invention.

FIG. 7 is a configuration diagram showing an embodiment of a control microcomputer of the present invention.

FIG. 8 is a configuration diagram showing another example of the internal structure of the bidirectional relay amplifier of the present invention.

FIG. 9 is a block diagram showing another embodiment of the base station of the present invention.

FIG. 10 is a system configuration diagram showing an example of a conventional bidirectional relay amplifier.

[Explanation of Codes] 1 Telephone line interface (branch circuit) 2 Radio frequency FDMA /
TDD, TMDA / TDD or CDMA system transmitter 3 Radio frequency FDMA /
Receivers such as TDD, TMDA / TDD or CDMA system 4, 5, 8, 8A, 8B Branch circuit 4A, 4B Radio frequency band combiner 6 Downward amplification circuit 7 Upward amplification circuit 9 Telephone Line connection terminal 10, 10A, 10B Radio frequency signal input / output terminal of base station 11, 11A, 11B Bidirectional relay amplifier input terminal 12, 12A, 12B, 12B Bidirectional relay amplifier output terminal 12C, 12D Same as above 13, 14, 13A, 13B, high-frequency transmission means 14A, 14B Same as above 15, 15A, 15B Leaky coaxial cable or leaky antenna 21, 24 Input level detecting circuit 22, 23 Output level detecting circuit 30 Connection terminal 31, 32 for input level detecting circuit in the down direction Downlink amplifier circuit connection terminals 33, 34 Uplink amplifier circuit connection terminals 35, 40 Input level Connection terminals 43A of the control terminals 41 input level detection circuits of the amplification circuit of the control terminal 39 upstream of the amplifier circuit of the output terminal 36 downstream of the output terminal 37 and 38 the output level detection circuit of the detection circuit, 43B directional coupler 51-54 A / D converter 55, 56 D / A converter 57 Control circuit 58 RAM 59 ROM 81 Base station 82 Mobile station 83, 83A, 83B-Base station antenna 84, 84A , 84A-1 -Mobile station antenna 84A-2 , 84B, 84B-1 Same as above 84B-2 Same as above 85, 86 Connection terminal of bidirectional relay amplifier 87, 88 Antenna duplexer 89 Downlink relay amplifier circuit 90 Uplink relay amplifier circuit 91, 91A, 91B Bidirectional relay amplifier

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 1]

[Fig. 8]

[Fig. 2]

[Fig. 3]

[Fig. 4]

[Fig. 5]

[Fig. 6]

[Fig. 7]

[Fig. 9]

[Fig. 10]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04B 7/26 R

Claims (9)

[Claims] 1. A signal provided in a building such as a utility pole or a building or a natural object, or an overhead line extending between them, and an individual signal in the same radio frequency band in the up and down directions from the base station or the preceding stage side. Alternatively, they are connected via a common transmission means, and the signals in the same radio frequency band in the upstream and downstream directions to the subsequent stages are connected individually or via a common transmission means, and the same radio waves in the upstream direction, the downstream direction or both directions are connected. A base station dispersion apparatus having an amplifying means for amplifying a signal in a frequency band. 2. A signal in the same radio frequency band in the up and down directions from the base station or the front stage side is individually provided on a structure such as a utility pole or a building or a natural object, or an overhead line stretched between them. Alternatively, they are connected via a common transmission means, and the signals in the same radio frequency band in the upstream and downstream directions to the subsequent stages are connected individually or via a common transmission means, and the same radio waves in the upstream direction, the downstream direction or both directions are connected. A base station dispersion apparatus comprising: an amplifying unit for amplifying a signal in a frequency band and an antenna for a mobile station coupled to the amplifying unit. 3. An electric pole, a building such as a building, or a natural object, or an overhead line extending between them, and the like, which individually provide signals in the same radio frequency band in the up and down directions from the base station or the preceding stage side. Alternatively, it is characterized in that it has an amplifying means for amplifying a signal in the same radio frequency band in an up direction, a down direction or both directions, which is connected through a common transmitting means, and an antenna for a mobile station coupled to the amplifying means. Base station distribution device. 4. The amplifying means compares the detection level with a detecting means for detecting a signal level in the radio frequency band and controls the gain or output level of the amplifying means or the relationship between the input level and the output level. The base station distribution device according to claim 1, claim 2, or claim 3, characterized in that it has the control means. 5. The amplifying means is housed in a weatherproof casing having an integrated structure with the mobile station antenna, and the amplifying means is contained in a weatherproof casing. The base station dispersion device according to 1. 6. The base station dispersion according to claim 1, claim 2 or claim 3, characterized in that the power supply to the amplification means is performed via the radio frequency transmission means. apparatus. 7. The power supply to the amplifying means is performed via the transmitting means.
The base station distribution device according to item 2, item 2, or item 3. 8. The transmission means is a parallel line, a coaxial cable, a waveguide, a surface wave line, or an optical cable,
The signal in the radio frequency band is directly transmitted, or is transmitted via a signal in another radio frequency band, an optical signal, or the like. Claims 1, 2, or 3 The base station dispersion device according to 1. 9. A base station having a single or a plurality of transceivers operating at the same frequency such as a TDD system or a CDMA system, and a synthesizing means for synthesizing input / output signals of at least radio frequency bands of the transceivers. The signal of the same radio frequency band in the up direction and the down direction of the base station is connected via individual or common radio frequency transmission means. The base station distribution device according to item 3.