JPH11112399A - Frequency selective relay method and apparatus for mobile communication - Google Patents

Abstract

(57) [Summary] In a relay device for a blind spot, even if a channel used in a base station is changed, it is not necessary to go to the relay device and reset it. SOLUTION: A part of a radio wave received from a mobile station is branched by a directional coupler 29, a frequency of a received radio wave is detected by a frequency detection circuit 30, and the reception frequency is notified to an MPU 19. With reference to this, the frequency conversion synthesizers 14, 18, and, so as to relay the uplink frequency channel and the corresponding downlink channel, are relayed.
The frequency is set for 23 and 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, which is installed between a base station and a blind spot to enable communication in a blind spot such as a tunnel or an underground mall where radio waves from the base station do not reach. The present invention relates to a relay method and apparatus for selecting a radio wave from a base station and a radio wave from a mobile station, respectively, performing predetermined frequency conversion and amplifying the radio wave at that time, and making the frequency again the same as or different from the reception frequency.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional frequency selective repeater 3. Frequency used in mobile communication, for example, 800-9
The received signal in the 00 MHz band is received by the antenna 1, and after passing through the duplexer, is amplified collectively to a main level by the amplifier 5, is distributed by the distributor 9, and is input to the frequency selector 4. In the frequency selection unit 4, the signal in the 800 to 900 MHz band is temporarily reduced to a low frequency by the mixer 13, for example,
Convert (down-convert) to 130 MHz. Here, only the required frequency signal is selected as a 130 MHz signal (intermediate frequency) by selecting the channel by the bandpass filter 15. Thereafter, the signal is amplified by the amplifier 16, converted again into the required frequency in the 800 to 900 MHz band by the mixer 17, and an unnecessary wave is removed by the filter 19, so that only the required frequency is output from the frequency selection unit 4. Similar frequency selection is performed in each frequency selection unit 4,
After being combined by the combiner 10, they are collectively amplified by the amplifier 6 and radiated from the antenna 2 through the duplexer. The frequency selection unit 42 may transmit at the same frequency as the reception frequency or transmit at a frequency different by a predetermined value.

On the other hand, a signal received by the antenna 2 is radiated from the antenna 1 through the same processing as the above-described frequency conversion. As a result, bidirectional frequency selective relay is performed. The frequency selection is specified by a microprocessor (MPU) 1 in each frequency selection unit 4 from a frequency setting input device (which may be arranged in a frequency selection relay device).
9, the microprocessor 19 sets the local oscillation frequency of each of the synthesizer local oscillators 14, 18, 23, 27 with the data of the RAM 21 according to the control program stored in the ROM 20. Done in The frequency selective repeater has a plurality of frequency selectors 4, and the frequency to be selected needs to be specified in advance by the above-described means.

[0004]

In the conventional frequency selective repeater, when the frequency of the base station is changed, the frequency information of all the frequency selective repeaters that relay the frequency signal of the base station must be changed. However, there is a problem that the installation and maintenance are considerably complicated. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of solving this problem by setting a frequency to be relayed by the apparatus itself without specifying a frequency in the frequency selective relay apparatus.

[0005]

According to the frequency selective radio relay method of the present invention, a downlink frequency signal from a base station or an uplink frequency signal from a mobile station is detected, and the detected downlink frequency and The frequency selection unit automatically specifies the frequency so that only the corresponding upstream frequency or detected upstream frequency and the corresponding downstream frequency are amplified and relayed. The specification of frequency information in a frequency selective repeater installed in a blind spot is because the frequency information of the base station to be relayed is known only to the provider of the mobile communication service,
Installation and maintenance had to rely on operators. According to the present invention, installation and maintenance can be easily performed without knowing such information.

[0006]

FIG. 1 shows a frequency-selective repeater according to the present invention, and portions corresponding to those in FIG. 3 are denoted by the same reference numerals. In this embodiment, a description will be given only of a frequency-selective relay apparatus that automatically specifies uplink and downlink frequencies based on uplink frequencies from a mobile station. However, uplink and downlink frequencies are automatically specified based on downlink frequencies. Since the concept is the same for the frequency selection type relay apparatus, the description is omitted here.

[0007] Radio waves from the mobile station are received by the mobile station antenna 2, passed through the duplexer, and then collectively amplified by the amplifier 7. A part of the amplified output is extracted by the directional coupler 29, and the frequency is detected by the frequency detection circuit 30. The frequency detection circuit 30 receives the frequency sweep of, for example, 300 to 900 MHz assigned to the system, and when the frequency sweep matches the frequency of the upstream radio wave, a large output is obtained, and the reception frequency of the upstream radio wave is detected. . The detected frequency information is provided to the MPU 19. The MPU 19 obtains R from the given frequency information.
According to the control program stored in the OM 20, the RAM
The frequency of the frequency selection unit 4 is set using the data of No. 21.

FIG. 2 shows a processing procedure of the control program of the ROM 20 in this case. It is determined from the acquired frequency information whether the information is frequency information that can be relayed by the device (S1),
If the frequency is out of the relayable frequency band, the frequency is not set. If the frequency is in the relayable frequency band, the information of the frequency set in the device from the RAM 21 and the plurality of frequency selectors 4 (S2), it is checked whether the read frequency has already been set (S3). If not, it is checked whether the frequency selector 4 has not been set (S3).
4) In addition, the frequency selection unit 4 which has already set the frequency acquires information on the order in which the frequency is set. If the acquired frequency information is already set in the frequency selection unit 4, the frequency is not set, and if not set, the frequency selection unit 4 or the first First, the frequency selection unit 4 to which the frequency is set is selected (S5), and the information is written in the RAM 21 (S6), and then the frequency is set for the frequency selection unit 4 (S7).

A frequency band usable in the system is determined in advance, and each frequency of a downlink channel paired with an uplink channel is also determined. When the set frequency is determined, the MPU 19 operates the RPU according to the program in the ROM 20 as described with reference to FIG.
Synthesizers 14 and 1 based on AM21 data
The frequencies 8, 23 and 27 are set respectively.

[0010]

As described above, according to the present invention, the frequency of the received radio wave is detected, and the frequency of the paired up / down frequency selector 4 corresponding to the detected frequency is automatically set. Is done. Therefore, for example, when the channel used by each base station is changed based on the addition of a zone, the relay device itself automatically changes the relay frequency without going to the relay device for the blind spot and resetting the relay frequency. Fluctuations are made and are very convenient.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a frequency-selective relay apparatus of the present invention.

FIG. 2 is a flowchart illustrating an example of a procedure of an automatic frequency designation process of the frequency selective relay apparatus according to the present invention;

FIG. 3 is a block diagram showing a configuration of a conventional frequency selective repeater.

Claims (2)

[Claims] 1. A radio wave is relayed to a space where radio waves from a base station do not reach (hereinafter referred to as a blind spot), a radio wave received from a mobile station (hereinafter referred to as an uplink signal), a radio wave received from a base station (hereinafter referred to as an up signal) (Hereinafter referred to as "downlink signal") in a two-way frequency selective relay method that amplifies and re-emits only the received radio wave of the frequency specified in advance, the relay device detects the frequency of the received radio wave, and the relay device can relay. If the radio wave is in a wide frequency band,
A frequency selective relay method for mobile communication, comprising setting respective frequencies of an uplink reception wave and a downlink reception wave corresponding to the frequency, selectively receiving, amplifying and transmitting both reception waves of the set frequency. . 2. A radio wave is relayed to a blind spot where a radio wave from a base station does not reach, and only a radio wave received at a predetermined frequency out of a radio wave received from a mobile station and a radio wave received from a base station is amplified. In a radiating bidirectional frequency-selective repeater, a memory storing a combination of a radio wave frequency received from a base station and a radio wave frequency received from a mobile station that can be used in advance, and a frequency for detecting the frequency of the received radio wave A frequency selecting type relay device for mobile communication, comprising: detecting means; and means for setting a frequency so that bidirectional transmission and reception can be performed by referring to the memory in correspondence with the detected frequency. .