JPH08265243A - Base station distribution device - Google Patents

Abstract

PURPOSE: To distribute the signals of the radio frequency band of a base station to a wide range by using a bidirectional relay amplifier for relay-amplifying the signals of the radio frequency band of the same frequency to be transmitted and received in both incoming direction and outgoing direction. CONSTITUTION: In the bidirectional relay amplifier 91A for branching the incoming direction and the outgoing direction by branching circuits 5 and 8, performing amplification by amplifier circuits 6 and 7, and performing relay amplification by a high frequency transmission means or from a counter mobile station antenna connected to a terminal 12B into both directions to the base station or to a mobile station, the gain of the amplifier circuits 6 and 7 is controlled by a microcomputer 25 for control based on the detected results of input detection circuits 21 and 24 and output detection circuits 23 and 22.

Description

Detailed Description of the Invention

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 a base station in a wide range.

[Prior Art] FIG. 11 shows, for example, the third collection of research presentations published by the Institute of Electrical Communication, Nippon Telegraph and Telephone Public Corporation.
8 is a configuration diagram of a conventional bidirectional repeater amplifier shown in No. 7. In the figure, (81) is a base station, and (91)
Is a bidirectional relay amplifier, (82) is a mobile station, (83) is a base station antenna, (84) is a mobile station antenna, and (8)
7) (88) is an antenna duplexer, (89) is a base station (8
1) a downstream amplification circuit for relay amplification of the signal, (90) an upstream amplification circuit for relay amplification of the signal from the mobile station (82), and (85) (86) connection terminals. Is. Next, the operation will be described. The signal from the base station (81) received by the base station antenna (83) is transmitted to the antenna duplexer (8) through the connection terminal (85).
7) is demultiplexed, is amplified by the downstream amplification circuit (89), is re-radiated from the mobile station antenna (84) through the antenna duplexer (88) and the connection terminal (86), and is received by the mobile station (82). To be done. On the other hand, the signal from the mobile station (82) received by the mobile station antenna (84) is transmitted to the antenna duplexer (8) through the connection terminal (86).
8) demultiplexed, amplified by an up-direction amplifier circuit (90), re-radiated from a base station antenna (83) through an antenna duplexer (87) and a connection terminal (85), and received by a base station (81). To be done. In order to prevent oscillation due to wraparound inside or between antennas,
The isolation of the duplexer is large enough (6
0 dB or more) is essential. 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.

[Problems to be Solved by the Invention] Since the conventional bidirectional repeater amplifier is constructed as described above, the frequencies of the radio frequency band signals in the up direction and the down direction are different and are appropriately separated. Is essential, like the TDD system (time division simultaneous transmission / reception system) or the CDMA system,
There is a problem that it can not be applied when the signals of the radio frequency band in the up direction and the radio frequency band of the down direction are exactly the same, and the signals from the base station are dispersed by connecting the bidirectional relay amplifiers in multiple stages. No such application was made. 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.

[Means for Solving the Problems] The base station dispersion apparatus according to the present invention is installed in a building such as a telephone pole, and is provided between the bidirectional relay amplifier and a base station having a single or a plurality of transceivers. Alternatively, by connecting with a high-frequency transmission cable to another bidirectional relay amplifier, the service area of the base station is expanded and the radio frequency is effectively used, and the signals in the up and down directions are transmitted to the amplifier. By controlling the gain or output 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. It was done.

[Operation] In 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, or between the structures. By connecting the bidirectional relay amplifiers installed on the stretched overhead line by independent or common transmission means, and by providing amplifiers in the up and down directions respectively in the bidirectional relay amplifiers and amplifying, the up and down directions It is possible to suppress unnecessary oscillation due to wraparound of signals of the TDD system or the CDMA system in which signals in the same direction have the same frequency band, and it is possible to extend the service area of the base station.

[Embodiment] An embodiment of the present invention will be described below. FIG. 1 shows an installation example of a base station distribution device, where (81) is a base station for transmitting and receiving signals in the same radio frequency band, (91A) and (91B) are bidirectional relay amplifiers, and (84A) and (84B). ) Is the antenna for the mobile station, (92
A) (92B) is a building such as a telephone 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 into 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 shows another example of installation of the base station dispersion apparatus of the present invention, in which digital signals transmitted and received from the base station (81) are provided by making the lengths of the high frequency transmission cables (13) and (14) substantially equal. Of the adjacent pair of mobile station antennas (84
A) The effect of preventing an increase in transmission errors caused by mutual interference between signals in the radio frequency band transmitted and received from (84B) can be provided. FIG. 3 is a diagram showing an embodiment in which the base station dispersion apparatuses of the present invention are connected in parallel. (1) is a branch circuit for connecting a telephone line to branch an audio signal, (2) is a radio frequency Band TDMA / TDD system transmitter, (3) TDMA / TDD system receiver of radio frequency band, (4), (5) and (8) branch circuits for branching radio frequency band signals, (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 connection terminal of a telephone line, and (10) is the radio of the base station (81). Frequency band signal connection terminal, (11)
(12) (12A) (12B) are bidirectional relay amplifiers (9
1A) (91B) radio frequency band signal connection terminal, (8
4A) and (84B) are antennas for mobile stations, and (13) (1
4) 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). Transmitter (2)
The signal in the radio frequency band of the receiver and the receiver (3) is connected to the branch circuit (4).
Is connected to the connection terminal (11) via the common high-frequency transmission cable (13) by the connection terminal (10) and is connected to the bidirectional relay amplifier (91A) at the directional coupler (15). , The branch circuit (5) again branches in the up direction and the down direction, the down direction is amplified by the amplification circuit (6), the up direction is amplified by the amplification circuit (7), and is branched by the branch circuit (8) to move in pairs. It is connected to the 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 adopted as 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 acts as a sun shade, and the bidirectional relay amplifier has excellent weather resistance. Can be realized. FIG. 4 is a diagram showing another embodiment in which the base station distributing 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. Frequency band TDMA /
TDD transmitter, (3) TDMA / in the radio frequency band
TDD receiver, (4), (5) and (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 in the uplink direction. Radio frequency signal amplification circuit, (9) is a telephone line connection terminal, (1
0A) and (10B) are connection terminals for signals in the radio frequency band of the base station (81), (11A) (11B) (12) (12A)
(12B) and (12C) are bidirectional relay amplifiers (91A)
(91B) radio frequency band signal connection terminal, (84A)
(84B) is a mobile station antenna, (13A) (13B)
(14A) and (14B) are high frequency transmission cables, and (15
A) (15B) is 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). The radio frequency band signal of the transmitter (2) is connected to the independent high frequency transmission cable (13) by the connection terminal (10A).
A) is connected to the connection terminal (11A), and is coupled to the downstream amplifier (6) of the bidirectional relay amplifier (91A) at the directional coupler (15A), amplified and branched ( By 8), the antenna is connected to the mobile station antenna (84A) 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. 5 is a diagram showing an embodiment in which the base station dispersion devices of the present invention are connected in series,
(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, ( Reference numerals 4), (5), (8), (8A), and (8B) are branch circuits for branching signals in the radio frequency band, (6) is an amplifying circuit for signals in the downlink radio frequency band, and (7) is an uplink radio signal. Frequency band signal amplification circuit, (9) is a telephone line connection terminal, (1
0) is a connection terminal for a radio frequency band signal of the base station (81),
(11), (12), (12A) and (12B) are connection terminals for signals of the radio frequency band of the bidirectional relay amplifiers (91A) and (91B), (84A) and (84B) are mobile station antennas, and (1
3) and (14) are high-frequency transmission cables. 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). 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). And is branched to the up direction and the down direction again by the branch circuit (5), amplified in the down direction by the amplification circuit (6), amplified in the up direction by the amplification circuit (7), and branched by the branch circuit (8B). Connected to the mobile station 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 an output terminal (81) of the base station (81). Since the output can be made to have almost the same value as that in 10 A), the bidirectional relay amplifier can be coupled in multiple stages. FIG. 6 is a diagram showing another embodiment in which the base station distributing apparatuses 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 wireless circuit. Frequency band TDMA / TDD system transmitter, (3) radio frequency band TDMA / TDD system receiver, (8) branch circuit for branching radio frequency band signals, (6) downlink radio Frequency band signal amplification circuit, (7) is an upstream radio frequency band signal amplification circuit, (9) is a telephone line connection terminal,
(10A) and (10B) are connection terminals for signals in the radio frequency band of the base station (81), and (11A) (11B) (12) (12).
A) (12B) (12C) are bidirectional relay amplifiers (91
A) (91B) radio frequency band signal connection terminal, (84
A) (84B) is an antenna for the mobile station, and (13A) (13B).
B) (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 transmitted to the radio frequency band TDMA by the transmitter (2).
/ TDD signal, and the radio frequency band signal in the up direction is converted into a voice signal by the receiver (3). The radio frequency band signal 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 the bidirectional relay amplifier (91
It is connected to the downstream amplifier (6) of A), is amplified, is connected to the mobile station antenna (84A) by the branch circuit (8), and is radiated into space. On the other hand, the signal in the radio frequency band in the up direction is received by the antenna for mobile station (84A), is branched by the branch circuit (8), is amplified by the up amplifier circuit (7), and is connected to the high frequency transmission cable (13B). 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. 7 shows, for example, the internal configuration of the bidirectional relay amplifier (91B) shown in FIG.
(5) and (8) are circulators for branching upstream and downstream, (6) and (7) are amplification circuits, and (31) and (3).
2) is a connection terminal of the amplifier circuit (6), (21) and (23) are input level and output level detection circuits, and (33) and (3).
4) is a connection terminal of the amplifier circuit (7), (22) and (23) are input level and output level detection circuits, and (25) is A /
For example, a control microcomputer having a D / D / A converter, (11) is a connection terminal (coaxial connector) from the previous stage
Etc.) and (12) are connection terminals (coaxial connector, etc.) to the mobile station antenna. The signal in the radio frequency band from the connection terminal (11) is branched in the downward direction by the circulator (5), amplified by the amplification circuit (6), branched by the circulator (8), and guided to the connection terminal (12). On the way, the respective signal levels are detected by the input level detection circuit (21) and the output level detection circuit (23). Similarly, the connection terminal (1
Radio frequency signals from 2) are circulators (8)
Is branched in the upward direction by the amplifier, amplified by the amplifier circuit (7), and guided to the connection terminal (11) to the preceding stage through the circulator (5). On the way, the input level detection circuit (2
4) and the output level detection circuit (22) detect the respective signal levels. 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 depends on the value of the output level detection circuit (23) and the input level detection circuit (2).
From the difference in 4), the isolation of the circulator (8) or the degree of reflection from the next stage is adaptively estimated and determined. 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. 8 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 includes A / D converters (51) (52) (53) (54) and D / A.
Converter (55) (56), control circuit (57), R
It is composed of an AM (variable memory) (58), a ROM (fixed memory) (59) and the like. (35) (36) (3
7), (38), (39) and (40) are respective connection terminals, and the level detection circuits (21), (22) and (2) of FIG.
3) Outputs of (24) are terminals (35) (37) (38)
The gain control terminals of the amplifier circuits (6) and (7) are connected to 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, when the analog output from the level detection circuit (21) is applied to the terminal (35), it is converted into a digital signal by the A / D converter (51) and read by the control circuit (57). In this state, the other end (40)
When the input to (38) is 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 5). 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 set to G1 (d
B), the gain of the amplifier circuit (7) is G2 (dB), the isolation of the circulator (5) is Y1 (dB), and the isolation of the circulator (8) is Y2 (d).
In the case of B), 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. FIG. 9 is a configuration 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. Is. Amplifier circuit (6)
Reference numeral (7) is a radio frequency band straight amplifier, which is not normally required except for the linearity control of the downstream amplification circuit (6). However, if gain control is performed by the control circuit (25) shown in FIG. Stable operation can be secured. FIG. 10 is a diagram showing another embodiment of the present invention, in which a plurality of transmitters (2A) (2B) and receivers (3A) (3B) are provided in a base station (81).
Is provided, and the transmission / reception is synthesized individually by the synthesis circuits (16) and (17), and the connection terminals (10A) and (10B) of the high frequency transmission cable
Connected to. Channel utilization efficiency (traffic /
Channel), the TDMA / TD of a plurality of 4 channels is defined, as shown in the following example with a call loss rate of 1%.
It can be seen that the channel utilization efficiency in the case of combining the D transceivers is improved. 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 made small, there is an effect that the influence can be reduced by delay dispersion or the like. 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 also be realized by combining a / D converter or by configuring with a normal logic circuit, and an example of the control procedure was also shown, but there are various adaptive control procedures that utilize learning methods, fuzzy control procedures, and so on. Things 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, a similar 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 the branch circuit. 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 another installation example of the base station distribution apparatus of the present invention.

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

FIG. 4 is a configuration diagram showing another embodiment in which the base station distribution apparatuses of the present invention are connected in parallel.

FIG. 5 is a configuration diagram showing an embodiment in which the base station dispersion devices of the present invention are connected in series.

FIG. 6 is a configuration diagram showing another embodiment of the case where the base station dispersion devices of the present invention are connected in series.

FIG. 7 is a block diagram showing an embodiment of the internal structure of a bidirectional relay amplifier of the present invention.

FIG. 8 is a configuration diagram showing an embodiment of a control microcomputer of the present invention.

FIG. 9 is a configuration diagram showing another example of the internal structure of the bidirectional relay amplifier of the present invention.

FIG. 10 is a block diagram showing another embodiment of the base station of the present invention.

FIG. 11 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 12, 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]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention, one or more signals of the radio frequency band of the transmitter and receiver installed in a base station
Signals are combined or branched, and the radio frequency is transmitted by high-frequency transmission means.
The present invention relates to a base station dispersion device for distributing and transmitting and receiving signals in the wave number band at a plurality of locations .

[0002]

2. Description of the Related Art FIG. 11 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)
Through 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 indispensable that the frequencies of the signals in the radio frequency bands in the up direction and the down direction are different and are appropriately separated. Yes, FDMA / TDD (Freq
uency Division Multipl e A
access / Time Division Duplex
x), TDMA / TDD (Time Divisio)
n, Multiple Access / Time Di
Vision Duplex, CDMA (Code
(Division Multiple Access)
Time-division simultaneous transmission / reception system such as system (hereinafter referred to as TDD system)
As in that), there is a problem that can not be applied in the case of the signal is exactly the same frequency band of the radio frequency band of uplink and downlink direction, the base station the two-way relaying amplifier connected cascade No application was made to disperse the signals from. The present invention has been made to solve the above problems, and it is a transmitter and a receiver of a TDD system or the like.
The signals in the same radio frequency band from the base station with
Stable and amplified in the direction
The purpose is to deploy in a wide range outdoors or indoors by using structures such as inside the ding or underground shopping mall .

[0004]

A base station dispersion device according to the present invention is used for a building such as a utility pole , a building, an underground mall, or the like.
Rui is installed on the overhead line that extends between them and
Has a relay amplifier and single or multiple transmitters and receivers
Between the base station and the other bidirectional relay amplifier
The base station by connecting the
Expanding the service area of the company to effectively utilize radio frequency
It In addition, the radio frequency band in the up or down direction
In an amplifier that amplifies a signal, the gain or
By controlling the output or the relationship between the input and the output
Both the uplink and downlink radio frequencies have the same frequency.
Even in the TDD method and the like, the unnecessary oscillation due to the sneak of signals in the radio frequency band and the like can be suppressed.

[0005]

In 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 transmitters and receivers are extended to a utility pole, a building, an underground mall or the like, or a structure thereof. to two-way relaying amplifier installed in was overhead lines, respectively it individually or common high frequency
In the bidirectional relay amplifier, connected by transmission means
Amplification by installing separate amplifiers for each of the upstream and downstream directions
By doing so, the uplink and downlink radio frequencies
Radio frequency band such as TDD system which has the same frequency
The signal can be amplified by suppressing unnecessary oscillation due to wraparound, etc., and the service area of the base station can be expanded.

[Embodiment] An embodiment of the present invention will be described below. FIG. 1 shows an example of installation of a base station dispersion device, where (81) is a base station, (91A) and (91B) are bidirectional relay amplifiers, (84A) and (84B) are mobile station antennas, and (92A) ( 92B) is a structure such as a utility pole, (13)
(14) (15) is a high frequency transmission means , (82) is a mobile station
Alternatively, it is a terminal device . 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 synthesized at the radio side input / output terminals of the transceivers, and the high frequency transmission means ( 13 ) Is connected to the bidirectional relay amplifier (91A). High frequency transmission
Due to the loss of the means (13), the signal from the transmitter of the base station (81) is attenuated and 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), and is transmitted from the transmitter of the base station (81).
The signal is amplified and transmitted from the mobile station antenna (84A) to the space.
The signals in some radio frequency bands are transmitted by the high-frequency radiation of the next stage.
It is sent to the sending means (14). Conversely, radio frequency signals from the pairs mobile station antenna (84A) is amplified by the bi-directional amplifier repeater (91A), it is sent transferred to the base station via a radio-frequency transmission unit (13) (81). In this case, the amplification degree of the bidirectional relay amplifier (91A) and the high frequency transmission means (13).
The transmission loss of is set to almost the same value. On the other hand, the bidirectional relay amplifier ((91B) operates in the same manner, but the
Signals in the frequency band are leaky coaxial cables or leaky antennas
Sent to (15). FIG. 2 shows an installation example of the base station dispersion device of the present invention, in which the delay of digital signals transmitted and received from the base station (81) is made uniform by making the lengths of the high frequency transmission means (13) (14) substantially equal. It is possible to equalize the time and to prevent an increase in transmission errors caused by mutual interference between signals in the radio frequency band transmitted and received from the adjacent mobile station antennas (84A) (84B). FIG. 3 is a diagram showing an embodiment in which the base station distribution devices 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
Radio frequency band transmitter such as TDD system , (3) is radio frequency
Waveform band receiver such as TDD system , (4), (5) and (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) Is an amplifier circuit for signals in the radio frequency band in the upward direction, (9) is a telephone line connection terminal, (10) is a radio frequency band signal connection terminal of the base station (81), and (11), (12) and (12A). ) (12
B) is a connection terminal for signals in the radio frequency band of the bidirectional relay amplifiers (91A) and (91B), (84A) and (84B) are antennas for mobile stations, and (13), (14) and (15) are high frequency transmissions.
Means, (43) is a coupler such as a directional coupler. The voice signal from the telephone line is branched by the branch circuit (1) into voice signals in the up direction and the down direction, and the voice signal in the down direction is a signal in a radio frequency band such as TDD system by the transmitter (2) . (Hereinafter referred to as a radio frequency band signal), and a signal of the uplink radio frequency band such as the TDD system is converted into a voice signal by the receiver (3). The signals in the radio frequency band from the transmitter (2) and the receiver (3) are branched by the branch circuit (4) and connected to the connection terminal (1 ) via the common high-frequency transmission means (13) by the connection terminal (10).
Connected More bidirectional amplifier repeater (91A) to 1), square
It is coupled by the directional coupler (43), branched again by the branch circuit (5) in the up direction and the down direction, amplified by the amplification circuit (6) in the down direction and amplified by the amplification circuit (7) in the up direction, and branched. It is branched by the circuit (8) and connected to the mobile station antenna (84A). Radio frequency band signal
The remaining part of the connection terminal (12A) and high frequency transmission
Via the means (14) , the bidirectional relay amplifier (91
B). Similarly, a bidirectional relay amplifier (91
In B), the rest of the signal in the radio frequency band is the connection terminal.
Leaky coaxial cable or leakage cable via (12A)
Tena (with ground plane and with single or continuous radiating element
(15) which is an antenna composed of a high-frequency transmission line . Leaky coaxial cable or leaky antenna (15)
Is coupled to the mobile station (82) with a stable coupling coefficient,
Radio waves are radiated in the vertical direction, and an external conductor plays the role of a ground plane or has a ground plane itself to form an antenna strong against standing waves . Mobile station antenna (8
4A) and the bidirectional relay amplifier (91A) should be integrated.
Thus, it is possible to realize a compact bidirectional relay amplifier having excellent weather resistance. FIG. 4 is a diagram showing another embodiment in which the base station distributing 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. Frequency band TDD system transmitter, (3) receiver of radio frequency band TDD system, etc. , (4), (5) and (8) branch circuits for branching signals of radio frequency band, and (6) Downlink radio frequency band signal amplification circuit, (7) Uplink radio frequency band signal amplification circuit, (9) Telephone line connection terminal, (10A) (10B) Base station (81) of
Individual connection terminals for signals in the up and down radio frequency bands, (11A) (11B) (12A) (12B) (1
2C) (12D) is a bidirectional relay amplifier (91A) (91
B) Separate signals for radio frequency bands in the up and down directions
Connecting terminals, (84A) (84B-1 ) (84B-2)
Is a mobile station antenna, (13A) (13B) (14A)
(14B) (15A) and (15B) are high-frequency transmission means ,
(43A) and (43B) are directional couplers. The voice signal from the telephone line is branched by the branch circuit (1) into the upstream and downstream voice signals, and the downstream voice signal is transmitted by the transmitter (2) in the radio frequency band such as TDD system.
Is converted to JP, radio frequency signals in the upstream direction is converted into a voice signal by the receiver (3). A signal in the radio frequency band of the transmitter (2) is connected to the connection terminal (11) via the connection terminal (10A) via an independent high-frequency transmission means (13A).
Is connected to A), coupled to the directional coupler (43A) amplifier (6) in the downstream of the bidirectional amplifier repeater (91A) At a
The amplified signal is amplified, is connected to the mobile station antenna (84A) by the branch circuit (8), and is radiated into space. On the other hand, the radio frequency band signal in the up direction is transmitted to the mobile station antenna (84
A), received by the branch circuit (8), amplified by the upstream amplifier circuit (7), and then received by the directional coupler (4).
3B) is connected to the high frequency transmission means (13B), is connected to the receiver (3) of the base station (81) via the connection terminal (10B) , and is further connected to the directional couplers (43A) (4A).
One terminal of 3B) is a high frequency transmission means (14A) (14A)
Connected to the next stage bidirectional relay amplifier (91B) via B)
And are coupled by directional couplers (43A) (43B).
And amplified and paired with the mobile station antenna (84 B-1) (84
B-2) is connected. Mobile station antenna (84B-
1) (84B-2) is larger than the branch circuit (8)
More stable amplification due to isolation
There is an advantage. 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. 5 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 a voice signal, and (2) is a radio frequency. Band TDD transmitter, (3) is a radio frequency band T
A receiver such as a DD system , (4) (5) (8) (8A) (8
B) is a branch circuit for branching signals in the radio frequency band, (6)
Amplifier circuit of downlink radio frequency signals, (7) the amplifier circuit uplink radio frequency signals, (9) the connection terminals of the telephone line, radio (10) is a base station (81) Frequency band signal connection terminal, (11) (12) (12A)
(12B) is a connection terminal for signals in the radio frequency band of the bidirectional relay amplifiers (91A) and (91B), (84A) is an antenna for a mobile station, (13) and (14) are high-frequency transmission means, and (1)
5) is a leaky coaxial cable or a leaky antenna .
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 a radio frequency band signal by the transmitter (2).
Then, the radio frequency band signal in the up direction is converted into a voice signal by the receiver (3). The signals in the radio frequency band of the transmitter (2) and the receiver (3) are branched by the branch circuit (4) and are connected to the common high frequency transmission terminal (10).
It is connected to the connection terminal (11) via the stage (13), is branched again in the up direction and the down direction by the branch circuit (5), the down direction is the amplification circuit (6), and the up direction is the amplification circuit (7). ), Is branched by the branch circuit (8B), and is connected to the mobile station antenna (84A). On the other hand, the output terminal (12A) of the branch circuit (8A) transmits high frequency waves.
Feeding through the means (14) the next stage of the bidirectional amplifier repeater ((9
Connected to 1B), likewise, high frequency by a branch circuit (8)
It is connected to a wave leakage cable or a leakage antenna (15) . In this embodiment, for example, high frequency transmission means (11A)
Transmission loss is amplified by the amplification circuit (6) of the bidirectional relay amplifier (91A), so that the output terminal (12A) has almost the same value as the transmission output at the output terminal (10A) of the base station (81). Therefore, the bidirectional relay amplifier can be coupled in multiple stages. FIG. 6 is a diagram showing another embodiment in which the base station distributing apparatuses 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 wireless circuit. Transmitter of frequency band TDD system, etc. , (3) Reception of radio frequency band TDD system, etc.
Machine, (6) a circuit for amplifying signals in the radio frequency band in the down direction, (7), a circuit for amplifying signals in the radio frequency band in the up direction, (9) a telephone line connection terminal, (10A) (10A)
B) is the uplink direction of signals in the radio frequency band of the base station (81)
And connection terminals in the down direction , (11A) (11B) (12
A) (12B) (12C) (12D) is the way of going up the radio frequency band signals of the bidirectional relay amplifiers (91A) (91B)
Directional and downward connection terminals, (84A-1) (84A-
2) is a mobile station antenna, and (13A) (13B) (14)
A) and (14B) are high-frequency transmission means, and (15A) and (15A).
B) is a leaky coaxial cable or a leaky antenna .
The voice signal from the telephone line is branched into the upstream and downstream voice signals by the branch circuit (1), the downstream voice signal is converted into a radio frequency band signal by the transmitter (2), and the upstream radio signal is converted. The frequency band signal is converted into a voice signal by the receiver (3). The signal in the radio frequency band of the transmitter (2) is transmitted by an independent high frequency signal through the connection terminal (10A).
It is connected via feeding means (13A) to the connecting terminal (11A), connected to the downstream amplifier of the bidirectional amplifier repeater (91A) (6), amplified by pairs mobile station antenna (84
It is connected to A-1) and radiated into space. On the other hand, signals in the radio frequency band in the up direction are transmitted to the mobile station antenna (84A-
2), amplified by the upstream amplifier circuit (7), connected to the high frequency transmission means (13B), and connected to the receiver (3) of the base station (81) via the connection terminal (10B). It One terminal of each of the amplifier circuits (6) and (7) is branched into two, and high frequency transmission means (14A) (14)
B) is connected to the next-stage bidirectional relay amplifier (91B) and is amplified and leaked coaxial cable or leaked antenna.
(15A-1) (15A-2) . high frequency
Multi-stage connection for amplifying loss due to transmission means by amplifier
You can continue to use the signal in the radio frequency band of the base station in a wide range.
Can be dispersed in the enclosure. Figure 7, for example, shows the internal configuration of a bidirectional amplifier repeater (91A) shown in FIG. 4, (5) (8
A) and (8B) are circulators for branching in the up and down directions, (6) and (7) are up and down amplification circuits, (31) and (32) are connection terminals of the amplification circuit (6),
(21) and (23) are input level and output level detection circuits, (33) and (34) are connection terminals of the amplification circuit (7),
(22) (23) is the input level and output level detection circuit (25) for example, the control microcomputer, having a A / D, D / A converter (11) is connected from the previous stage terminal (coaxial connectors, etc.), ( 43A) and (43B) are bifurcated
Circuits (12A) and (12B) are connection terminals (coaxial connector, etc.) to the mobile station antenna. Radio frequency signals from the connection terminal (11) is amplified by a circulator (5) by the amplifier circuit is branched in the downstream direction (6) 2
Is branched into two by the branching circuit (43A), is branched through the circulator <br/> terpolymer (8A) (8B) connecting terminals (12
A) (12B). On the way, the respective signal levels are detected by the input level detection circuit (21) and the output level detection circuit (23). Similarly, wireless communication from the connection terminals (12A) and (12B) of the mobile station antenna is performed.
The signal in the wave number band is branched in the upward direction by the circulators (8A) and (8B), and is divided into two branch circuits (43A) and (43).
It is branched into two by B), amplified by the amplifier circuit (7), and guided to the connection terminal (11) to the preceding stage through the circulator (5). On the way, the input level detection circuit (2
4) and the output level detection circuit (22) detect the respective signal levels. 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 depends on the value of the output level detection circuit (23) and the input level detection circuit (2).
From the difference in 4), the isolation of the circulator (8) or the degree of reflection from the next stage is adaptively estimated and determined. Next, assuming that the mobile station or the terminal device (82) is in the transmitting state and the base station (81) is in the receiving state, the upstream amplifying circuit unless the output level detecting circuit (22) in the upstream direction detects a signal. The gain of (7) is kept high, but the output level detection circuit (2
2) When a signal level above a certain specified value is detected, the gain of the amplifier circuit (7) in the up direction is reduced and at the same time the gain of the amplifier circuit (6) in the down direction is further reduced than in the standby state. The degree to which the gains of the amplifier circuits (6) and (7) are reduced depends on the difference between the value of the output level detection circuit (22) and the input level detection circuit (21) and the degree of isolation of the circulator (5) or the reflection from the previous stage. Is adaptively estimated. Amplifier circuit as above (6)
The gain control in (7) is continuously performed adaptively,
Even when restarting after a power failure, it is set to start with the stored parameters, so it always operates in the optimum state. FIG. 8 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 is an A / D converter (51) (52).
(53) (54), D.I. A converter (55) (5
6), control circuit (57), BAM (variable memory) (5
8), ROM (fixed memory) (59) and the like. (35) (36) (37) (38) (39) (4
0) are respective connection terminals, and the outputs of the level detection circuits (21) (22) (23) (24) of FIG. 2 are connected to terminals (35) (37) (38) (40) for amplification. The gain control terminals of the circuits (6) and (7) are terminals (36) (3
9) is connected. 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, if the analog output from the level detection circuit (21) is the terminal (3
When applied to 5), 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 end (40) (38) is less than the specified value, the control circuit (57) causes the terminal (35) to
The gain of the amplifier circuit (6) is controlled via the D / A converter (55) so that a level proportional to the level of (3) is output to the terminal (37). At the same time, the gain of the amplifier circuit (7) is reduced via the D / A converter (56). In this way, each terminal (35) (37) (3
8) Amplifier circuit (6) according to the level condition of (40)
The procedure for controlling the gain in (7) is programmed. The gain of the amplifier circuit (6) is G1 (dB), the gain of the amplifier circuit (7) is G2 (dB), and the circulator (5).
When the isolation of the circulator (8) is Y2 (dB) and the isolation of the circulator (8) is Y2 (dB), G
A stable bidirectional relay amplifier can be realized by controlling the gains G1 and G2 so that the relationship of 1 + G2 and Y1 + Y2 always holds even when the circulator isolation changes. FIGS. 9 (A) and 9 (B) show FIG.
2 is a configuration diagram of a bidirectional relay amplifier (91A) (91B) in (11A) (11B) (12A) (12B).
(12C) and (12D) are individual connection terminals, (6) is a downstream amplification circuit, (7) is an upstream amplification circuit, and (43)
A) (43B) is a two-branch circuit . This bidirectional relay amplification
If you use a device, you can completely separate the up and down directions.
Therefore, stable operation can be secured. Also multiple send and receive
When synthesizing transceivers, the
This is a method to suppress sensitivity from the transmitter to the receiver simply by changing the wave number.
There is a merit that can be greatly improved by the method. The amplifier circuits (6) (7) are radio frequency band straight amplifiers,
Usually system except the control of the linearity of the amplifier circuit downlink (6)
A control circuit is not required, but the control circuit (25) shown in FIG.
If gain control is performed by, a more stable operation can be secured. FIG. 10 is a view showing another embodiment of the present invention,
The base station (81) is provided with a plurality of transmitters (2A) (2B) and receivers (3A) (3B), and combining circuits (16) (17)
The transmission and reception are combined individually and the connection terminal (10
A) (10B) is connected. Channel utilization
If defined as (Erlang / Channel) , the call loss rate is 1 below.
%, As shown in the example in the case of
It can be seen that when the channel utilization efficiency is calculated when the DMA / TDD transceiver is combined, the utilization efficiency is significantly improved. In addition, in the above, when there are two transceivers,
As mentioned above, the larger the number of transceivers,
Although the efficiency is high, saturation begins at about 20 channels.
4 transceivers of 4 channel TDMA / TDD
It is economical to synthesize as a set and disperse in various directions.
It 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 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. Also, the control microcomputer is not a DSP but a normal microcomputer and D / 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 available. Things 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. Also, a circulator is used for the branch circuit of the signal in the radio frequency band ,
Hybrid circuits, directional couplers, electronic switches or
Similar effects can be obtained by the distributor or the like. Also high
There is an external conductor on the frequency transmission means or mobile station antenna.
Leaky coaxial cable or leaky waveguide acting as a ground plane
Single or continuous radiating element with tube or ground plane
A leaky antenna consisting of a high-frequency transmission line having
A antenna having a ground plane or a reflector as an antenna for a mobile station.
Antenna, corner reflector, or parabola
By using antennas, etc.,
Trust can be secured. Moreover, CATV or the like other high-frequency transmission means
Shared with the transmission of signals in the radio frequency band of
A separate oscillator for transmission is provided and mixed with the local oscillator.
By lowering the frequency of the signal in the radio frequency band and transmitting it in the section of the high-frequency transmission means, and then returning it to the original state by the bidirectional relay amplifier, the usage efficiency of the high-frequency transmission means is improved and the transmission loss is reduced. A method such as doing is possible. Also, high frequency
Bidirectional from the base station side or the opposite direction through wave transmission means
Bidirectional relay amplification by supplying power to the relay amplifier
It is possible to remove electricity from the container. Although the base station distribution apparatus of the present invention has been described for the case of installing the electric pole, each floor, natural object in Birudeingu, stretched between these rack
The same effect can be obtained when installed on the line or in an underground mall .

[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 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 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. 2]

[Fig. 7]

[Fig. 8]

[Fig. 3]

[Fig. 4]

[Fig. 5]

[Fig. 6]

[Fig. 9]

[Fig. 10]

[Fig. 11] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 25, 1995

[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]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention, one or more signals of the radio frequency band of the transmitter and receiver installed in a base station
Signals are combined or branched, and the radio frequency is transmitted by high-frequency transmission means.
The present invention relates to a base station dispersion device for distributing and transmitting and receiving signals in the wave number band at a plurality of locations .

[0002]

2. Description of the Related Art FIG. 11 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 indispensable that the frequencies of the signals in the radio frequency bands in the up direction and the down direction are different and are appropriately separated. Yes, FDMA / TDD (Freq
uency Division Multipl e A
access / Time Division Duplex
x), TDMA / TDD (Time Division)
Multiple Access / Time Div
Ion Duplex, CDMA (Code D
ivision Multiple Access)
Simultaneous time-division simultaneous transmission / reception system such as a system (hereinafter referred to as TDD system)
As in that), there is a problem that can not be applied in the case of the signal is exactly the same frequency band of the radio frequency band of uplink and downlink direction, the base station the two-way relaying amplifier connected cascade No application was made to disperse the signals from. The present invention has been made to solve the above problems, and it is a transmitter and a receiver of a TDD system or the like.
Bidirectional signals in the same radio frequency band from base stations with
Stable relay amplification with a utility pole or building day
The purpose is to deploy in a wide range outdoors or indoors by using the structure inside the underground or underground mall .

[0004]

A base station dispersion device according to the present invention is used for a building such as a utility pole , a building, an underground mall, or the like.
Rui is installed on the overhead line that extends between them and
Has a relay amplifier and single or multiple transmitters and receivers
Between the base station and the other bidirectional relay amplifier
The base station by connecting the
Expanding the service area of the company to effectively utilize radio frequency
It In addition, the radio frequency band in the up or down direction
In an amplifier that amplifies a signal, the gain or
By controlling the output or the relationship between the input and the output
Both the uplink and downlink radio frequencies have the same frequency.
Even in the TDD system and the like, unnecessary oscillation due to wraparound of signals in the radio frequency band can be suppressed.

[0005]

In 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 transmitters and receivers are extended to a utility pole, a building, an underground mall or the like, or a structure thereof. to two-way relaying amplifier installed in was overhead lines, respectively it individually or common high frequency
In the bidirectional relay amplifier, connected by transmission means
Amplification by installing separate amplifiers for each of the upstream and downstream directions
By doing so, the uplink and downlink radio frequencies
Radio frequency band such as TDD system which has the same frequency
The signal can be amplified by suppressing unnecessary oscillation due to wraparound, etc., 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
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)Mobile station or terminal
apparatusIs. The base station (81) is the same as the TDD system.
Single or multiple transmitters and receivers operating on one frequency
It is composed of a device and is combined with the input / output terminal on the radio side of the transceiver.
IsHigh frequency transmission means (13) Bidirectional relay amplifier
(91A).High frequency transmission means(13)
Signal from base station (81) transmitter is attenuated due to loss of
Connected to the bidirectional relay amplifier (91A) or
It is coupled by a directional coupler or the like. Bidirectional relay amplifier
(91A) is attached to a building such as a telephone pole (92A)
And the relevant base stationThe signal from the transmitter of (81) is amplified
Is radiated into space from the mobile station antenna (84),
Signals in the radio frequency band of
4).Conversely, is it a mobile station antenna (84A)?
RanoRadio frequency bandSignal is bidirectional relay amplifier (91A)
IncreaseWidened and high frequency transmission means (13)Through the base station
(81)Will be sent.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)Operate in the same way, but some high frequency band signals
No. to leaky coaxial cable or leaky antenna (15)
Sent.FIG. 2 shows an example of installation of the base station distribution device of the present invention.
Indicates thatHigh frequency transmission means(13) (14) length is almost
Transmitting and receiving from the base station (81) by equalizing
The delay time of the digital signal
None transmitted / received from the mobile station antennas (84A) (84B)
Caused by mutual interference between signals in the line frequency band
It can have the effect of preventing an increase in transmission errors.
It FIG. 3 shows a case in which the base station distribution devices of the present invention are connected in parallel.
FIG. 1 is a diagram showing an example of the case where
A branch circuit that connects and branches the audio signal, (2)Radio frequency
Such as several TDD systemsTransmitter, (3)Radio frequency band
Such as TDD methodReceiver, (4) (5) (8) are radio frequency
A branch circuit that branches signals in several bands, (6)
Line frequency band signal amplification circuit, (7) Uplink radio
Frequency band signal amplification circuit, (9) is the connection end of the telephone line
Child (10) is the base station (81) radio frequency band signal
Connection terminal, (11) (12) (12A) (12B)
Directional relay amplifier (91A) (91B) radio frequency band
Signal connection terminals (84A) and (84B) are for mobile station
Tena, (13) (14)(15)IsHigh frequency transmission means,
(43) is a coupler such as a directional coupler.Telephone line
These audio signals are sent to the upstream and downstream by the branch circuit (1).
Direction audio signal is branched and downlink audio signal is transmitted
Machine (2)Depending on the TDD system radio frequency bandSignal of
(Less thanRadio frequency bandSignal), and the
DirectionalRadio frequency bandofFrom signals such as TDD methodReceiving machine
It is converted into an audio signal by (3). Transmitter (2) and receiver
The signal in the radio frequency band from the transmitter (3) is the branch circuit (4).
Is branched by the connection terminal (10)high frequency
Transmission means (13)To the connection terminal (11) viaMore twins
Directional coupler connected to the directional relay amplifier (91A)
Combined by (43),By the branch circuit (5) again
It is branched into an up direction and a down direction, and an amplification circuit in the down direction.
By (6), the up direction is amplified by the amplifier circuit (7).
And is branched by the branch circuit (8) to the mobile station antenna
(84A).The rest of the radio frequency band signal
The part includes a connection terminal (12A) and a high-frequency transmission means (1
4)Connected to the next-stage bidirectional relay amplifier (91B) via
Is done. Similarly, in the bidirectional relay amplifier (91B)wireless
For the rest of the signal in the frequency band, connect the connection terminal (12A)
Through a leaky coaxial cable or a leaky antenna (ground plane
High frequency transmission with a single or continuous radiating element
(15) which is an antenna consisting of a roadConnected. Leaky coaxial
The cable or leaky antenna (15) is connected to the mobile station (8
2) is coupled with a stable coupling coefficient and its vertical direction
Radio waves are emitted to the outer conductor and the outer conductor plays a role of the ground plane.
Since it has the ground plane itself, it is resistant to standing waves.I Ann
Form the tena.Mobile station antenna (84)And bidirectional
Compact size by integrating the relay amplifier (91A)
A bidirectional repeater amplifier having excellent weather resistance can be realized. Fig. 4
Other than the case where the base station distribution devices of the present invention are connected in parallel.
FIG. 1 is a diagram showing an embodiment of the present invention, in which (1) is a connection of telephone lines
A branch circuit for branching the voice signal, (2) is a radio frequency bandT
DD method, etc.Transmitter, (3) radio frequency bandOf TDD
Ceremony, etc.Receivers, (4), (5) and (8) are radio frequency band signals.
Circuit for branching out the signal, (6) is the radio frequency in the down direction
Band signal amplification circuit, (7)
Signal amplification circuit, (9) is a telephone line connection terminal, (10)
A) (10B) is the base station (81)Up and down direction
ofRadio frequency signalIndividualConnection terminal, (11A)
(11B) (12A) (12B) (12C)(12D)
Of the bidirectional relay amplifier (91A) (91B)In the up direction
DownhillRadio frequency signalIndividualConnection terminal, (8
4A)(84B-1) (84B-2) isAnte to mobile station
Na, (13A) (13B) (14A) (14B)(15
A) (15B)IsHigh frequency transmission means,(43A) (43
B) isIt is a directional coupler. The voice signal from the telephone line
Up and down audio signals by the branch circuit (1)
The audio signal in the downstream direction is branched by the transmitter (2).
handFor signals in the radio frequency band such as the TDD systemConverted and going up
DirectionalRadio frequency bandIs received by the receiver (3).
Is converted into a number. Radio frequency band signal of transmitter (2)
Is independent of the connection terminal (10A)High frequency transmission means
Is connected to the connection terminal (11A) via (13A),
Directional couplerTo (43A)At the bidirectional relay amplifier (91
In the downstream amplifier (6) of A)Combined,Amplified
To the mobile station antenna (84A) by the branch circuit (8)
It is connected and radiated into space. On the other hand, radio frequency in the up direction
The band signal is received by the mobile station antenna (84A),
Upward amplification circuit branched by the branch circuit (8)
Directional coupler amplified by (7)(43B)By
High frequency transmission means (13B) and the connection terminal (10
Connected to the receiver (3) of the base station (81) via B).
And one end of the directional coupler (43) (43B)
The child is the next stage through the high frequency transmission means (14A) (14B).
Connected to the bidirectional relay amplifier (91B) of
Connected by a container (43A) (43B),Amplified pair
Mobile station antenna (84B-1) (84B-2)Connected to
Be done.Mobile station antenna (84B-1) (84B-2)
In between, there is more isolation than the branch circuit (8).
Since it is obtained, there is an advantage that more stable amplification can be performed.Real
In the example, the up-and-down direction and the amplification circuit are sufficiently isolated.
Since it is rated, unnecessary oscillation due to wraparound is pulled.
It has the advantage that it is unlikely to occur. Fig. 5 shows the invention
An example of connecting the base station dispersion devices of the above in series is shown.
(1) connects the telephone line and branches the voice.
Branch circuit, (2) is for 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 several band signals, (7)Radio frequency
bandSignal amplification circuit, (9) is a telephone line connection terminal,
(10) is the connection of signals in the radio frequency band of the base station (81)
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 radio frequency bandIs converted to the signal ofUpstream radio
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 set to almost the same value
Therefore, it is possible to combine multi-way relay amplifiers in multiple stages.
I can do it. FIG. 6 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 bandsThe receiver such as TDD system, (6)Down radio
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)Wireless relay of dual power relay amplifier (91A) (91B)
Of the signal in the wavebandUp 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).
Frequency bandTo the signal ofConverted to the upstream radio 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).
More independentHigh frequency transmission meansConnect via (13A)
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, uplink radio frequency band signals are moving
Station antenna(84A-2) received in uplinkamplifier
Amplified by circuit (7),High frequency transmission means(13
B) connected to the base station via the connection terminal (10B)
It is connected to the receiver (3) of (81). Amplifier circuit (6)
One terminal of (7) is branched into two,High frequency transmission
means(14A) (14B) to increase the next-stage bidirectional relay
It is connected to the width device (91B) and amplifiedLeaky coaxial cable
Or leaky antenna (15A-1) (15A-2)
ToConnected.The loss due to high frequency transmission means is
Multi-stage connection may be used to
Signals in the wave number band can be dispersed over a wide range.Figure 7 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 the output level detection circuits (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)2 by 2 branch circuits (43A)
Branched off,circulator(8A) (8B)Through
Branched connection terminal(12A) (12B)Be guided. Way
Input level detection circuit (21) and output level detection
Each signal level is detected by the circuit (23)
It Similarly, the connection terminal of the mobile station antenna(12A)
(12B)fromRadio frequency bandSignal of the circulator
ー(8A) (8B)Is branched in the direction by2-branch circuit
(2) Branched by (43A) and (43B)Amplifier circuit
Amplified by (7) through circulator (5)
It is led to the connection terminal (11) to the preceding stage. On the way, input level
Detection circuit (24) and output level detection circuit (22)
The respective signal levels are detected by. Detected
The input and output levels are controlled by the control microcomputer (2
5) compared and amplified by the programmed procedure
The gain of circuits (6) and (7) is controlled. TDD method
The characteristic of the formula is that the transmission frequency and the reception frequency are the same.
Does not send and receive at the same time. That is, going up
Signal must not exist in both direction
Take advantage of this feature from. In the control circuit of the present invention,
Taking advantage of the characteristics of the TDD system, an amplifier circuit (6) and
The gain is adaptively controlled in (7) to control the up and down directions.
It is designed to eliminate the oscillation generated by the wraparound in the direction.
Is programmed. First, the gain of the downstream amplification circuit (6)
The profit is set relatively small,
The gain of the amplifier circuit (7) is a predetermined relatively large value.
Is set to. Next, the base station (81) enters the transmission state.
Yes If the mobile station (82) is in the receiving state,
Input level detection circuit (21) from the base station (81)
The gain of the amplifier circuit (6) is increased when the signal of
Output so that the linearity of the amplifier circuit (6) is maintained.
At the same time as controlling the force, the gain of the upstream amplification circuit (7)
Reduces profits. Degree of decreasing the gain of the amplifier circuit (7)
The output level detection circuit (23) and the input level detection
The eye of the circulator (8) from the difference of the output circuit (24)
The degree of reflection from the isolation or the next stage is adapted.
Estimate and decide on Eve. Then the mobile stationOr terminal device
(82) is in the transmitting state and the base station (81) is in the receiving state.
If there is, an output level detection circuit in the upward direction (22)
Of the amplifier circuit (7) in the up direction unless is detected by the
Gain remains high, but upstream output level detection
Detecting signal level (22) that exceeds a certain specified value
Then, the same as decreasing the gain of the amplifier circuit (7) in the up direction.
Sometimes the gain of the downstream amplification circuit (6) is lower than in the standby state.
Further reduce. Reduce the gain of the amplifier circuit (6) (7)
The degree of setting depends on the value of the output level detection circuit (22) and the input level.
Circulator (5) from the difference of bell detection circuit (21)
The degree of isolation of the
Estimated to be adaptive. Amplifier circuit as above
(6) The gain control of (7) continues adaptively
Parameters that have been memorized even if restarted after a power outage
Always optimized to be set to start by
It operates in the state of. FIG. 8 shows a control microcomputer (25)
It is a figure which shows the specific example of. The control microcomputer (25)
For example, it is called DSP (Digital Signal Processor)
The A / D converter (51) (5
2) (53) (54), D / A converter (55)
(55), control circuit (57), RAM (variable memory)
(58), ROM (fixed memory) (59), etc.
Is done. (35) (36) (37) (38) (39)
(40) are the respective connection terminals, the level of FIG.
Output terminals of detection circuits (21) (22) (23) (24)
(35) (37) (38) (40)
The gain control terminals of the paths (6) and (7) are the terminals (36) (3
9) is connected. The control of the control microcomputer (57) is R
Executed by the program written in OM (59)
The control parameters of each circuit are written in RAM (58).
It is remembered and backed up by a battery. For example,
Analog output from the terminal detection circuit (21) is the terminal (35)
Is applied to the digital signal by the A / D converter (51).
It is converted into a digital signal and read by the control circuit (57).
In this state, the input to the other end (40) (38) is below the specified value.
In the case below, the control circuit (57) is the level of the terminal (35).
So that a level proportional to
Of the amplifier circuit (6) via the A / A converter (55)
Control the gain. At the same time, the D / A converter (5
The gain of the amplifier circuit (7) is reduced via 6). this
In this way, each terminal (35) (37) (38) (40)
The gain of the amplifier circuits (6) and (7) is controlled according to the level condition.
The procedure to control is programmed. Of the amplifier circuit (6)
The gain is G1 (dB), and the gain of the amplifier circuit (7) is G2 (d).
B), circulator (5) isolation Y
1 (dB), circulator (8) isolation
Let Y2 (dB) be G1 + G2 <Y1 + Y2
Relationship changes the circulator isolation
Control G1 and G2 so that they always hold even when
By doing so, a stable bidirectional repeater amplifier can be realized.
It Fig. 9(A) and (B) are the two-way relay increase in FIG.
Width (91A) (91B)Configuration diagram, (11
A) (11B) (12A) (12B) (12C) (12
D) is an individual connection terminal,(6) is a downstream amplification circuit,
(7) is an upstream amplification circuit,(43A) and (43B)
2-branch circuitIs.With this bidirectional relay amplifier,
Since the direction can be completely separated from the downward direction, stable movement can be achieved.
The work can be secured. Also, when combining multiple transceivers
The frequency is different between the transceivers without synchronization.
This method significantly reduces the sensitivity from the transmitter to the receiver.
There is a merit that can be improved.The amplifier circuits (6) and (7)
It is a radio frequency band straight amplifier that amplifies in the downward direction.
Other than controlling the linearity of the circuit (6)Normally the control circuitNecessary
There is no gain control by the control circuit (25) shown in FIG.
By doing so, stable operation can be secured. Figure 10 shows
It is a figure which shows the other Example of Ming, and a plurality of base stations (81) are provided.
Transmitter (2A) (2B) receiver (3A) (3B)
It is provided and combined by the combining circuit (16) (17) individually for sending and receiving
Of high frequency transmission meansConnect to connection terminals (10A) (10B)
Is done. Channel utilization(Erlan / Channel)
WhenIf defined, the following shows an example of a call loss rate of 1%.
To send and receive multiple 4-channel TDMA / TDD
To find the channel utilization efficiency when combining machinesEffectiveness
The rate is significantlyIt can be seen that it will be improved.In the above,
I mentioned the case of two receivers, but the number of transceivers is
The larger the value, the higher the channel utilization efficiency, but 20 channels
4 channels of TDM because saturation begins at the channel level
Combines 4 A / TDD transceivers as a set,
It is economical to disperse in. 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 usage efficiency is 46% (of which
1 channel is for control) 16 channels: Channel utilization efficiency is 50% (of which
One channel is for control) For example, if four channel base stations are provided at four locations,
The input / output of a 6-channel base station is the base station distribution device
Compared with the case where it is distributed to 4 locations, 4 channels are installed in 4 locations: Channel usage 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 an ordinary microcomputer and D / A
 Combine with an A / D converter or use a standard logic
It can also be realized by a method such as a circuit configuration,
Even though I showed an example, the adaptation using learning method was adopted.
Eve control procedure or fuzzy control procedure
It is possible. Also, bidirectional relay with the mobile station antenna
It was explained that the amplifier is integrated, but it is housed in another case.
However, the same effect can be obtained. Also,Radio frequency bandSignal of
A circulator was used for the branch circuit of
Hybrid circuits, directional couplers, electronic switches or
To the distributor, etc.Therefore, the same effect can be obtained. Also, High
There is an external conductor on the frequency transmission means or mobile station antenna.
Leaky coaxial cable or leaky waveguide acting as a ground plane
Single or continuous radiating element with tube or ground plane
A leaky antenna consisting of a high-frequency transmission line having
A antenna having a ground plane or a reflector as an antenna for a mobile station.
Antenna, corner reflector, or parabola
By using antennas, etc.,
Trust can be secured.Also,High frequency transmission meansCATV, etc.other
Shared with the transmission of signals in the radio frequency band of
A separate oscillator for transmission is provided andMixing
Radio frequency bandHigh frequency transmission means by lowering the signal frequency
And then restore it again with a bidirectional relay amplifier.
By doingTo improve the utilization efficiency of high-frequency transmission means
Methods such as reducing transmission loss can be considered.Also, high frequency
Bidirectional from the base station side or the opposite direction through wave transmission means
Bidirectional relay amplification by supplying power to the relay amplifier
It is possible to remove electricity from the device.Also, the base station dispersion of the present invention
I explained how to install the device on a telephone pole.
In IngofEach floor, natural product, A rack stretched between these
On the line or in underground mallsEven if installed in
Be done.

[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 yet to realize the impedance of a mobile station antenna. Even when the isolation of the circulator changes due to the change of, etc., 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 shows another installation example of the base station distribution device of the present invention .
Diagram

[Fig. 3] A case of connecting the base station dispersion devices of the present invention in parallel
Configuration diagram showing an embodiment

[Fig. 4] A case of connecting the base station dispersion devices of the present invention in parallel
Configuration diagram showing another embodiment of the case

[Fig. 5] A case where the base station dispersion devices of the present invention are connected in series
Configuration diagram showing an embodiment

FIG. 6 shows a case where the base station dispersion devices of the present invention are connected in series.
Configuration diagram showing another embodiment of the case

FIG. 7 is a diagram showing the internal structure of the bidirectional relay amplifier of the present invention .
Configuration diagram showing an example

FIG. 8 is a configuration showing an embodiment of a control microcomputer of the present invention .
Figure

FIG. 9 shows another internal structure of the bidirectional relay amplifier of the present invention .
Configuration diagram showing an example

FIG. 10 is a block diagram showing another embodiment of the base station of the present invention.

FIG. 11 is a system showing an example of a conventional bidirectional relay amplifier.
Diagram

[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 4A, 4B Radio frequency band combiner 6 Downward amplification circuit 7 Upward amplification circuit 9 Telephone line connection terminals 10, 10A, 10B Base station Radio frequency signal input / output terminal 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 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 Direction amplifier circuit connection terminals 35, 40 Input level detection circuit output terminals 37, 38 Output Output terminal of force level detection circuit 36 Control terminal of downstream amplification circuit 39 Control terminal of upstream amplification circuit 41, 42 Connection terminal of input level detection circuit 43A, 43B Directional couplers 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 vs. base station antenna 84, 84A , 84A-1 vs. 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

Claims (9)

[Claims] 1. A signal provided in a building such as a telephone pole or a building, a natural object, or an overhead line stretched between them, or the like, which individually or individually receives signals in the same radio frequency band in the up and down directions from the base station or the preceding stage side. Connect via a common transmission means, connect signals in the same radio frequency band in the upstream and downstream directions to the subsequent stage individually or via a common transmission means, and use the same radio frequency in the upstream or downstream direction or both directions. A base station dispersion apparatus having an amplification means for amplifying a band signal. 2. An electric pole, a building such as a building, or a natural object, or an overhead line stretched between them, or the like, and individually or individually receives signals in the same radio frequency band from the base station or the preceding stage in the up and down directions. Connect via common transmission means, connect signals in the same radio frequency band in the upstream and downstream directions to the subsequent stage individually or via common transmission means, and use the same radio frequency in the upstream or downstream direction or both directions. A base station dispersion apparatus comprising: an amplifying unit for amplifying a band signal, and a pair mobile station antenna coupled to the amplifying unit. 3. An electric pole, a building such as a building, a natural object, or an overhead wire stretched between them, or the like, and individually or individually receives signals in the same radio frequency band from the base station or the preceding stage in the upstream and downstream directions. It is characterized in that it is connected through a common transmission means and has an amplifying means for amplifying a signal in the same radio frequency band in the up direction, the down direction or both directions, and the paired mobile station antenna 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 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. 7. 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. 8. The first aspect of the present invention is characterized in that the transmission means are installed at substantially equal lengths from the base station.
The base station distribution device according to item 2, item 2, or item 3. 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. Claims 1, 2, or 3 wherein the signals of the same radio frequency in the up and down directions of the base station are connected via individual or common radio frequency transmission means. The base station distribution device according to item.