JPH07297777A - Radio repeater installation for mobile communication - Google Patents

Abstract

PURPOSE:To miniaturize an amplifier by separating an amplifier for a base station and that for a mobile station from each other so that they can be stored in enclosures independent of each other. CONSTITUTION:The distance between an amplifier 14 for a base station and a transmission antenna 11s is shorter than that between the amplifier 14 and a reception antenna 18r, and a transmission line 12s can be made shorter than a transmission line 17r. The distance between an amplifier 15 for a mobile station and a transmission antenna 18a is shorter than that between the amplifier 15 and a reception antenna 11r, and a transmission line 17s can be made shorter than a transmission line 12r. The transmission radio wave from a mobile station is received by the reception antenna 18r from the mobile station, and this signal passes the transmission line 17r to feed and is amplified by the amplifier 14 and passes the transmission line 12s and is transmitted to the base station from the transmission antenna 11s to the base station. In the same manner, the transmission radio wave from the base station is received by the reception antenna 11r for the base station, and this signal passes the transmission line 12r and is amplified by the amplifier 15 and passes the transmission line 17s and is transmitted from the transmission antenna 18s for the mobile station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to mobile communication.
In order to enable communication in areas where communication is difficult due to the shadow of high-rise buildings and lower reception levels such as underground malls, the radio waves received from the base stations are amplified and transmitted again to mobile stations, The present invention also relates to a wireless relay device that amplifies radio waves from a mobile station and transmits them again to the base station.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional wireless relay device of this type. An antenna 11 for a base station is connected to a shared end of an antenna duplexer 13 via a transmission line 12 such as a coaxial transmission line, and two shared ends of the antenna duplexer 13 are output sides of a base station (upstream) amplifier 14. , And the input side of the (down) amplifier 15 for mobile stations, and the input side of the amplifier 14 and the output side of the amplifier 15 are connected to two shared ends of the antenna duplexer 16, respectively. The shared end of is connected to an antenna 18 for mobile stations through a transmission line 17 such as a coaxial transmission line.

The control unit 19 monitors the output powers of the amplifiers 14 and 15, and when the output powers of the amplifiers 14 and 15 are about to exceed a predetermined value, they are controlled so as to reduce the gain of the amplification. The display element 21 is the control unit 19
The amplifiers 14 and 15 are turned on by visual inspection so that the operational states of the amplifiers 14 and 15 can be visually monitored. Further, operating power supply power is supplied from the power supply unit 22 to each of the amplifiers 14 and 15 and the control unit 19. The antenna duplexers 13 and 16, the amplifiers 14 and 15, the control unit 19, and the power supply unit 22 are normally housed in one housing 23, and the display element 2 is provided on the outer surface of the housing 23.
1 is mounted so that it can be seen from the outside.

Obstacles that block the propagation of radio waves (such as building walls)
The base station side (left side in the figure) of 24 is a place where an appropriate reception level can be obtained, and the other side of the obstacle 24 or the inside of the obstacle is a dead zone where the reception level is low on the mobile station side, that is, a service by a wireless relay device. This is a region, and in the figure, the case 23 is provided in the vicinity of the base station antenna 11,
You may provide in the vicinity of the antenna 18 for mobile stations.

Radio waves from the base station are received by the antenna 11, amplified by the mobile station amplifier 15 via the antenna duplexer 13, and transmitted from the mobile station antenna 18 via the antenna duplexer 16 to the service area of the wireless relay device. To be done.
Radio waves from the mobile station are received by the antenna 18, and the duplexer 1
6 is amplified by the base station amplifier 14, and the duplexer 13
Is transmitted from the antenna 11 to the base station via.

[0006]

In wireless relay, an amplifier for amplifying and outputting a radio wave to be relayed and an antenna for transmitting the radio wave are connected by a transmission line such as a coaxial feed line. It is better to minimize the propagation loss due to. This is because, if the propagation loss is large, it is necessary to increase the output of the amplifier by the amount of the loss, which requires the amplifier to be large-sized and also leads to an increase in price. To reduce the propagation loss of the power transmission line,
It is possible to select a cable with low loss,
There are problems such as cable enlargement and price increase.

It is assumed that the radio relay casing 23 can be installed at an arbitrary position on the transmission path connecting the antenna 11 for base stations and the antenna 18 for mobile stations. Here, the propagation loss between the receiving antenna and the input side of the amplifier is L1, the propagation loss between the transmitting antenna and the output side of the amplifier is L2, the reception level at the receiving antenna position is Pi, and the receiving antenna position is at the transmitting antenna position. When the transmission output Po of (1) and the required gain of the amplifier are G, the relationship shown in Expression (1) is established.

Po = Pi−L1 + G−L2 = Pi− (L1 + L2) + G (1) If the power transmission lines to be used are the same, L1 + L2 = constant, no matter where the wireless relay device housing 23 is, the required gain G Does not change. If the output of the amplifier is Pbo, the relationship of Pbo = Pi-L1 + G is established, and the larger P1 is, the smaller the output Pbo of the amplifier is. That is,
If the wireless relay device housing 23 is near the transmitting antenna,
The output of the amplifier can be small, and the above problem can be solved.

Therefore, in the wireless relay of the radio wave transmitted from the base station to the mobile station, the wireless relay device housing 23 may be installed near the antenna 18 for the mobile station. However, in the wireless relay of the radio waves transmitted from the mobile station to the base station, the wireless relay device housing 23 is provided near the antenna 11 for the base station.
Is a good place to set up, and it becomes a contradiction, and in the end, the above problem cannot be solved.

An object of the present invention is to solve this contradiction and to reduce the output of the amplifier, thereby providing a radio relay apparatus for mobile communication which enables miniaturization of the amplifier.

[0011]

According to the invention of claim 1, a mobile station (downlink) amplifier for relaying and amplifying radio waves from a base station, and a base station (uplink) for amplifying radio waves from the mobile station.
The distance between the amplifier for the mobile station and the antenna for receiving the radio wave from the base station and the antenna for transmitting the radio wave to the mobile station is set so that the latter distance is shorter than the former distance. The distance between the amplifier for the base station and the antenna for receiving the radio wave from the mobile station and the antenna for transmitting the radio wave to the base station is smaller than the former distance. That is, the mobile station amplifier is provided as close to the mobile station antenna as possible, and the base station amplifier is provided as close to the base station antenna as possible.

According to a second aspect of the invention, in the first aspect of the invention, the antenna for transmitting the radio wave to the base station and the antenna for receiving the radio wave from the base station are shared, and this antenna is provided via an antenna duplexer. Connected to the output side of the amplifier for the base station and the transmission line connected to the input side of the amplifier for the mobile station, the antenna that transmits the radio wave to the mobile station and the antenna that receives the radio wave from the mobile station are shared This antenna is connected to the output side of the mobile station amplifier and the transmission line connected to the input side of the base station amplifier via the antenna duplexer.

According to the invention of claim 3, in the invention of claim 2, the first signal duplexer is provided between the input side of the amplifier for the base station and the transmission line side of the first antenna duplexer and one end of the multiplex transmission line. And the second signal duplexer is connected between the input side of the amplifier for mobile stations and the transmission line side of the second antenna duplexer, and the other end of the multiplex transmission path. The base station antenna side and the mobile station antenna side are connected by the common multiplex transmission path.

According to the invention of claim 4, in the invention of claim 3, a control section for controlling the amplifier is provided near one of the amplifier for the base station and the amplifier for the mobile station, and the base from the control section is provided. A multiplexing circuit is provided which multiplexes a control signal for the other of the station amplifier and the mobile station amplifier and a relay signal at the common end of the signal duplexer connected to the one amplifier and supplies the multiplexed signal to one end of the multiplex transmission path. In the vicinity of the other amplifier, the control signal from the other end of the multiplex transmission line and the relay signal are separated, and the control signal is supplied to the control end of the other amplifier as a control signal, and the relay signal Is provided to the common end of the signal duplexer near the other amplifier.

[0015]

FIG. 1 shows an embodiment of the invention of claim 1 and FIG.
The same symbols are attached to the portions corresponding to. The base station amplifier 14 is provided near the antenna 11s that transmits radio waves to the base station, and the output side of the amplifier 14 is connected to the base station transmission antenna 11s through a power transmission line 12s such as a coaxial power supply line. Controls the base station amplifier 14,
Control unit 19u for monitoring, amplifier 14 and control unit 19u
The power supply unit 22u for supplying operating power to the amplifier 14
It is also provided in the relay device housing 23u. A display element 21u for displaying the operating state of the amplifier 14 is attached to the housing 23u so as to be visible from the outside. Amplifier for base station 14
The input side of is connected to an antenna 18r that receives radio waves from a mobile station through a power transmission line 17r such as a coaxial wire. The reception antenna 18r is provided on the opposite side of the radio wave obstacle 24 from the base station amplifier 14, that is, in the radio wave obstacle region.

Similarly, the mobile station amplifier 15 is provided near the antenna 18s for transmitting radio waves to the mobile station, and the output side of the amplifier 15 is a power feeding transmission line 17 such as a coaxial power feeding line.
connected to the mobile station transmission antenna 18s through
Control unit 19d for controlling and monitoring the amplifier 15 for mobile stations
And the power supply unit 22d that supplies operating power to the amplifier 15 and the control unit 19d together with the amplifier 15 the relay device housing 2
It is provided in 3d. The operating state of the amplifier 15 is the display element 2
1d is attached to the housing 23d so as to be visible from the outside. The input side of the mobile station amplifier 15 is connected to an antenna 11r that receives a radio wave from a base station through a power transmission line 12r such as a coaxial wire. Receiving antenna 11r
Is provided on the side opposite to the mobile station amplifier 15 with respect to the radio wave obstacle 24, that is, in a region where the radio wave obstacle is not received.

Therefore, the distance between the base station amplifier 14 and the transmitting antenna 11s is determined by the distance between the amplifier 14 and the receiving antenna 1s.
The distance between the transmission line 12s and the transmission line 1s is smaller than the distance between
It can be shorter than 7r. Similarly, the distance between the mobile station amplifier 15 and the transmission antenna 18s is determined by the amplifier 15
Is smaller than the distance between the receiving antenna 11r and the transmitting path 17
It is possible to make s shorter than the transmission line 12r.

The reception antenna 18r for the mobile station receives the radio wave transmitted from the mobile station, and the signal is used as the power transmission line 17r.
, Is amplified by the amplifier 14, passes through the transmission line 12s,
The signal is transmitted from the transmission antenna for base station 11s toward the base station. Similarly, the reception antenna 11r for the base station receives the radio wave transmitted from the base station, the signal passes through the transmission line 12r, is amplified by the amplifier 15, passes through the transmission line 17s, and is transmitted from the transmission antenna for the mobile station 18s. It is transmitted to the mobile station. Further, the control unit 19u controls the amplifier 14 and displays its operating state by the display element 21u.
The control unit 19d controls the amplifier 13 and displays its operating state by the display element 21d.

FIG. 2 shows an embodiment of the invention of claim 2 and parts corresponding to those in FIGS. 1 and 5 are designated by the same reference numerals. In this example, the transmitting antenna 11s for the base station and the receiving antenna 11r are also used as the transmitting / receiving antenna 11 as in the prior art shown in FIG.
This is a case where the transmission / reception antenna 18 also serves as the 8s and the reception antenna 18r. For this reason, the antenna duplexer 13 is provided in the housing 23u, the shared end thereof is connected to the antenna 11 through the transmission path 12, the output side of the amplifier 14 is connected to one of the two shared ends of the duplexer 13, and the other end. Is connected to one end of a transmission line 26 such as a rotation line, and the transmission line 2
The other end of 6 is connected to the input side of the mobile station amplifier 15.

Similarly, the antenna duplexer 16 is provided in the housing 22d.
, The shared end of the duplexer 16 is connected to the antenna 18 through the transmission line 17, one of the two shared ends is connected to the output side of the amplifier 15, and the other end is through the transmission line 27 such as a coaxial line. It is connected to the input side of the base station amplifier 14. Since this operation does not seem to be particularly described, it is omitted.

FIG. 3 shows an embodiment of the invention of claim 3. In this embodiment, the transmission lines 26 and 27 in the housings 23u and 23d are shared. That is, the signal duplexer 28 is provided in the housing 23u, one of the two shared ends is connected to the input side of the amplifier 14, and the other is connected to the transmission line 26 of the antenna duplexer 13 in FIG. It is connected to the shared end, and the common end is connected to one end of the multiplex transmission line 29 such as a coaxial line. A signal duplexer 31 is provided in the housing 23d, and one of the two shared ends of the signal duplexer 31 has the amplifier 1
5, the other end is connected to the shared end that was connected to the transmission line 27 of the antenna duplexer 16 in FIG. 2, and the common end is connected to the other end of the multiplex transmission line 29.

An upstream signal from the mobile station to the base station is supplied from the antenna duplexer 16 through the signal duplexer 31 to the multiplex transmission line 29, and is input to the base station amplifier 14 through this multiplex transmission line 29. Further, the downlink signal from the base station to the mobile station is supplied from the antenna duplexer 13 through the signal duplexer 28 to the multiplex transmission line 29, and is input to the mobile station amplifier 15 through this multiplex transmission line 29.

FIG. 4 shows an embodiment of the invention of claim 4. In this embodiment, the control unit 19 is provided only near one of the base station amplifier 14 and the mobile station amplifier 15, and in FIG. 4, the control unit 19 is provided only near the latter.
5. Control and monitor both of them. The other amplifier 1
The control signal for 4 is sent to the signal sharing device 3 in the multiplexing circuit 32.
The signal is multiplexed (for example, frequency division multiplexing) with the relay signal at the shared end of 1 and supplied to the multiplex transmission path 29. On the side of the housing 23u, the demultiplexing circuit 33 separates the control signal and the relay signal, the control signal is supplied to the control end of the amplifier 14, and the relay signal is supplied to the common end of the signal duplexer 28. Both amplifiers 1
The operating status of 4, 15 is the case 23 in which the controller 19 is provided.
It is displayed on the display element 21 of d.

[0024]

As described above, according to the present invention, the base station amplifier 14 and the mobile station amplifier 15 are separated from each other so that they can be accommodated in the separate housings 23u and 23d. The amplifier 14 for the base station can be provided near the antenna for the base station, and the amplifier 15 for the mobile station can be provided near the antenna for the mobile station.
Both the power feeding transmission lines between the antennas 4 and 15 and their transmitting antennas are short, the loss in the transmission lines can be reduced, and the outputs of the amplifiers 14 and 15 can be reduced correspondingly, resulting in miniaturization. Therefore, the structure can be configured at low cost, and the influence of intermodulation in common amplification of multi-frequency signals can be reduced.

Further, in the invention of claim 2, the transmitting antenna and the receiving antenna can be shared, and in the invention of claim 3, the housing 2 is used.
Going up an expensive high-frequency transmission line connecting between 3u and 23d,
According to the invention of claim 4, it can be shared in the downlink, and the number of control units is further one, and it is not necessary to provide a control signal transmission line.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the invention of claim 1;

FIG. 2 is a block diagram showing an embodiment of the invention of claim 2;

FIG. 3 is a block diagram showing an embodiment of the invention of claim 3;

FIG. 4 is a block diagram showing an embodiment of the invention of claim 4;

FIG. 5 is a block diagram showing a conventional wireless relay device.

Claims (4)

[Claims] 1. A wireless relay device for mobile communication, which relays and amplifies radio waves from a base station and transmits the amplified radio waves to a mobile station, and relays and amplifies radio waves from the mobile station and transmits the radio waves to the base station. An amplifier for mobile stations that relays and amplifies the radio waves of the above, and an amplifier for base stations that amplifies the radio waves from the mobile stations are provided apart from each other, and an antenna for receiving the radio waves from the base stations and the mobile station The distance between the antenna for transmitting radio waves to the mobile station and the amplifier for mobile stations is set to be shorter than the distance between the mobile station and the antenna for receiving radio waves from the mobile station, and the base. A wireless relay device for mobile communication, characterized in that the distance between the antenna for transmitting radio waves to the base station and the amplifier for the base station is smaller than the distance to the station amplifier. 2. An antenna for receiving radio waves from the base station and an antenna for transmitting radio waves to the base station are shared, and the antenna, the output side of the base station amplifier and the mobile station are shared. The first antenna duplexer is inserted between the amplifier and the transmission line connected to the input side, and the antenna for receiving the radio wave from the mobile station and the antenna for transmitting the radio wave to the mobile station are shared. The second antenna duplexer is inserted between the antenna and the transmission line connected to the output side of the amplifier for mobile stations and the input side of the amplifier for base stations. Wireless relay device for communication. 3. A first signal duplexer is connected between the input side of the base station amplifier and the transmission line side of the first antenna duplexer and one end of a multiplex transmission line, and the first signal duplexer is connected to the mobile station amplifier. A second line is provided between the input side and the transmission line side of the second antenna duplexer and the other end of the multiplex transmission line.
3. A signal duplexer is connected to the signal duplexer.
A wireless relay device for mobile communication as described above. 4. A control unit for controlling the amplifier for the base station and the amplifier for the mobile station is provided near one of the amplifier for the base station and the amplifier for the mobile station from the control unit. A multiplexing circuit is provided for multiplexing the control signal for the other and the relay signal at the common end of the signal duplexer connected to the one amplifier and supplying the multiplexed signal to one end of the multiplex transmission line, and near the other amplifier. In, separating the control signal and the relay signal from the other end of the multiplex transmission line, and supply the control signal to the control end of the other amplifier as a control signal,
4. The mobile communication wireless relay apparatus according to claim 3, further comprising a demultiplexing circuit for supplying a relay signal to a common end of a signal duplexer near the other amplifier.