JP2783248B2 - Wireless base station network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system, and more particularly to a network of radio base stations used in mobile radio telephones, radio local area networks, and the like.

[0002]

2. Description of the Related Art In a radio communication system such as a mobile radio telephone and a radio local area network, a service area is divided into a plurality of small areas, and a radio base station is arranged for each of the small areas. By connecting each wireless base station with a cable, wireless communication between small areas becomes possible. Conventionally, in signal transmission between radio base stations, each radio base station performs conversion between a radio signal and a baseband signal,
The baseband signal was transmitted in the cable. This system is called a baseband system, and performs signal routing between radio base stations by extracting control information such as the address of a partner terminal from a baseband signal.

[0003]

The conventional wired transmission between wireless base stations using the baseband system has the following problems. A first problem is that the modulation scheme and the signal format of the baseband signal transmitted between the radio base stations need to be common. The reason is that it is necessary to extract information related to signal routing from the demodulated radio signal in a radio base station that performs signal transmission / reception and relay. In addition, when connecting to a network using a different modulation method or signal format, a new device for signal conversion is required.

[0004] The second problem is that control in the radio base station is complicated. The reason is that each wireless base station converts both the wireless main signal and the wireless control signal into a baseband signal, so that each wireless base station requires a high-speed modem.

The present invention relates to a radio communication system such as a mobile radio telephone, a radio local area network, etc., which can easily realize signal routing between radio base stations using radio frequency signals using radio frequency signals. The purpose is to provide a network.

[0006]

In order to solve the above-mentioned problems, a first radio base station network of the present invention comprises a mobile station, a plurality of radio base stations for transmitting and receiving radio signals to and from the mobile station, A wireless base station network comprising a cable for connecting the wireless base stations to each other, wherein the mobile station and the wireless base station frequency-multiplex and transmit a wireless main signal and a wireless control signal; A radio control signal receiving circuit for receiving and demodulating a radio control signal transmitted from a mobile station; and an intermediate unit having a radio base station having a frequency unique to the radio base station determined according to the demodulated radio control signal. An intermediate frequency transmitting circuit that converts the signal into a frequency signal and outputs the signal to the cable; and an intermediate frequency signal that receives only the intermediate frequency signal having a frequency unique to the wireless base station among the intermediate frequency signals output on the cable. Has a wave number receiving circuit, the radio main signal transmission circuit transmits the intermediate frequency signal received by the intermediate frequency receiver circuit converts the radio main signal to the destination mobile station.

[0007] In a first embodiment of the first radio base station network, all radio base stations transmit downlink signals for transmitting radio signals to mobile stations, and uplink channels for receiving radio signals from mobile stations. Use a common frequency band on the line.

In a second embodiment of the first radio base station network, all radio base stations use a common frequency band for a downlink for transmitting a radio signal to a mobile station, and all radio base stations use the same frequency band. The base station uses a common frequency band for an uplink for receiving a radio signal from a mobile station, and the downlink and the uplink have different frequency bands.

In a third embodiment of the first radio base station network, the intermediate frequency transmitting circuit of the radio base station has a plurality of frequency converters, and converts a radio main signal transmitted from a mobile station into a plurality of intermediate signals. Convert to frequency signal and output to cable.

A second radio base station network according to the present invention comprises a mobile station, a plurality of radio base stations for transmitting and receiving radio signals to and from the mobile station, and a cable for interconnecting the radio base stations. A mobile station and a radio base station network in which the radio base station frequency-multiplexes and transmits a radio main signal and a radio control signal, wherein each radio base station receives a radio control signal transmitted from the mobile station. A radio control signal receiving circuit for demodulation, and a radio frequency transmission circuit for converting the radio main signal to a radio frequency signal of a frequency unique to a radio base station determined according to the demodulated radio control signal and outputting the radio frequency signal to a cable, A radio frequency receiving circuit that receives only a radio frequency signal of a frequency unique to each radio base station among radio frequency signals output on the cable, and a radio frequency signal received by the radio frequency receiving circuit. It has a wireless main signal transmission circuit transmits the radio frequency signal to the destination mobile station.

A third radio base station network according to the present invention comprises a mobile station, a plurality of radio base stations for transmitting / receiving radio signals to / from the mobile station, and a signal received from the radio base station to another radio base station. A wireless base station network comprising a central station for transfer, a wireless base station, and a cable for interconnecting the central stations, wherein the mobile station and the wireless base station frequency multiplex and transmit a wireless main signal and a wireless control signal. Each radio base station converts the radio main signal and the radio control signal transmitted from the mobile station into an intermediate frequency main signal and an intermediate frequency control signal having a frequency unique to the central station, and outputs them to the cable. An intermediate frequency transmitting circuit, and an intermediate frequency receiving circuit that receives only an intermediate frequency main signal of a frequency unique to the radio base station among the intermediate frequency main signals output on the cable, A wireless main signal transmitting circuit for converting the intermediate frequency main signal received by the intermediate frequency receiving circuit into a wireless main signal and transmitting the converted signal to the mobile station, wherein the central station has an intermediate frequency output on a cable; Among the main signal and the intermediate frequency control signal, an intermediate frequency receiving circuit that receives only the intermediate frequency main signal and the intermediate frequency control signal having a frequency unique to the central office, and an intermediate frequency control signal demodulator that demodulates the intermediate frequency control signal An intermediate frequency transmission circuit for converting the intermediate frequency main signal into an intermediate frequency main signal having a frequency unique to the radio base station determined according to the demodulated intermediate frequency control signal, and outputting the converted signal to a cable; A station transmits the radio main signal and the radio control signal transmitted from the mobile station to an intermediate frequency main signal and an intermediate frequency control signal having a frequency unique to a central station. The central office demodulates the intermediate frequency control signal received from the cable, and converts the intermediate frequency main signal to a frequency specific to the radio base station determined by the demodulated intermediate frequency control signal. The intermediate frequency main signal is converted to an intermediate frequency main signal and output to the cable, and the radio base station determined according to the demodulated intermediate frequency control signal converts the intermediate frequency main signal received via the cable into a radio frequency main signal. To the destination mobile station.

In the first radio base station network according to the present invention, the mobile station and the radio base station frequency-multiplex and transmit a radio main signal and a radio control signal. In wireless base stations,
Of these, only the radio control signal is demodulated, the carrier frequency of the radio main signal is converted according to the radio base station to which the mobile station of the transmission destination belongs, and the intermediate frequency signal is output to the cable connecting the radio base stations. . Each radio base station has a receiving circuit tuned to a unique intermediate frequency, and extracts a signal matching the tuning frequency of the receiving circuit from the frequency-multiplexed intermediate frequency signal input from the cable. The radio base station to which the destination mobile station belongs converts the carrier frequency of the intermediate frequency signal received from the cable according to the radio frequency band to be used, and transmits the converted signal to the mobile station.

According to the method of the present invention, the radio base station does not modulate and demodulate the radio main signal, but only performs the conversion of the carrier frequency of the radio main signal and the detection of the control signal necessary for routing. It will be easier. Further, the modulation speed, modulation method and format of the signal transmitted between the radio base stations only need to be common between the communicating parties, and signals of different modulation speed, modulation method and format are mixed in the network. However, a transparent network can be realized.

In a first embodiment of the first radio base station network of the present invention, all radio base stations receive a radio signal from a mobile station and a downlink for transmitting a radio signal to the mobile station. The same radio frequency band is used for the up link. Therefore, when the radio base station converts the carrier frequency of the radio main signal transmitted from the mobile station, the radio base station converts the carrier frequency to an intermediate frequency sufficiently separated from the radio frequency band. Each wireless base station has a receiving circuit tuned to a unique frequency, and extracts a signal that matches the tuning frequency of the receiving circuit from the frequency-multiplexed signal input from the cable. The wireless base station to which the destination mobile station belongs converts the carrier frequency of the wireless main signal tuned from the cable according to the wireless frequency band to be used, and transmits the converted signal to the mobile station. As described above, by converting the carrier frequency of the radio signal to the intermediate frequency band in the radio base station, the frequency conversion is performed even in the case where the same radio frequency band is used for both the downlink and the uplink in all the radio base stations. Routing of wireless signals becomes possible.

In the second embodiment of the first radio base station network, all radio base stations use a common radio frequency band for each of the downlink and uplink. However, the radio frequency bands of the uplink and downlink are different. At this time, as in the first embodiment, the radio base station converts the carrier frequency of the radio main signal transmitted from the mobile station to an intermediate frequency sufficiently distant from the radio frequency band. The wireless base station to which the destination mobile station belongs converts the carrier frequency of the wireless main signal tuned and received from the cable according to the downlink radio frequency band to be used and transmits the converted signal to the mobile station. By adopting such a configuration, it is possible to avoid collision of the downlink and uplink radio signals in the radio base station.

In a third embodiment of the first radio base station network of the present invention, each radio base station has a plurality of frequency converters for converting a carrier frequency of a radio main signal sent from a mobile station. . Thereby, the radio base station that has received the radio signal from the mobile station can broadcast the signal to a plurality of other radio base stations by the number of frequency converters owned by the radio base station.

In the second radio base station network of the present invention, each radio base station receives and demodulates a radio control signal transmitted from a mobile station, and a radio main signal belongs to a destination mobile station. It converts directly to the radio frequency used by the radio base station and outputs it to the cable. By directly converting the radio frequency in this way, the number of frequency converters can be reduced.

In the third radio base station network of the present invention, each radio base station first converts the carrier frequency of the radio main signal and radio control signal transmitted from the mobile station into an intermediate frequency unique to the central station. To the central office on the network. The central station demodulates only the radio control signal out of the received signals, obtains information on the mobile station to which the signal is transmitted, converts the carrier frequency of the radio main signal to match the routing destination radio base station, and converts the cable. Send to. By aggregating information on network control in the central station in this way, in each radio base station or mobile station,
It is not necessary to hold information on the routing destination wireless base station.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a wireless base station network according to the first embodiment of the present invention. FIG.
, The mobile station 10a is located in the area Z0 where the mobile station 12a can communicate with the radio base station 100,
It is assumed that the mobile station 10a and the mobile station 12a cannot be directly wirelessly communicated with each other. Also, the radio base stations 100, 101, 10
2 and 103 are cables 1a, 1b, 1c and 1d, respectively.
Connected through. Cables 1a, 1b, 1c,
For 1d, a signal whose attenuation is sufficiently small for a frequency-multiplexed signal is suitable, and a coaxial cable or an optical fiber cable is used. Hereinafter, a method in which the mobile station 10a transmits a signal to the mobile station 12a via the wireless base stations 100, 101, and 102 will be described.

FIG. 2 is a diagram showing a frequency allocation of radio signals and signals transmitted through a cable in the radio base station network of FIG.

FIG. 2A shows the radio base station 1 shown in FIG.
FIG. 5 is a diagram showing a frequency allocation of a radio signal received at 00.
In FIG. 2A, the radio base stations 100, 101, 10
The downlink frequency bands in which the radio signals 2 and 103 transmit radio signals to mobile stations are FRd0, FRd1, FRd2, and FRd.
3, 800 MHz band, 820 MHz band,
The 840 MHz band and the 860 MHz band are used. In addition, the frequency bands of the uplink where the radio base stations 100, 101, 102, and 103 receive radio signals from mobile stations are FRu0, F
Ru1, FRu2 and FRu3, each 900M
Hz band, 920 MHz band, 940 MHz band, 960 MH
Use the z band. When the mobile station 10a transmits a signal to the mobile station 12a, the mobile station 10a
The radio main signal FMu0 and the radio control signal FCu0 in the 900 MHz band are frequency-multiplexed and transmitted. The radio base station 100 receives the radio control signal F from the received radio signals.
By demodulating only Cu0, it is detected that the signal is routed to the radio base station 102, and the carrier frequency of the radio main signal FMu0 and the radio control signal FCu0 is set to 2
The signal is converted into a 00 MHz band intermediate frequency signal F2 and output to the cable 1a.

FIG. 2B is a diagram showing a frequency arrangement of signals transmitted through the cables 1a and 1b. In FIG. 2B, the radio base stations 100, 101, 10
Frequency bands 2 and 103 tuned to the signal input from the cable are F0, F1, F2, and F3, which are 120 MHz band, 160 MHz band, and 200 MHz, respectively.
MHz band and 240 MHz band are used. Wireless base station 100
The intermediate frequency signal F2 in the 200 MHz band output from the wireless base station 101 to the cable 1a is non-regeneratively relayed by the wireless base station 101, and is input to the wireless base station 102 via the cable 1b.

FIG. 2C is a diagram showing a frequency allocation of a radio signal transmitted by the radio base station 102. Wireless base station 1
02 receives in synchronization with the 200 MHz band intermediate frequency signal F2 input from the cable 1b, converts the frequency into a 840 MHz band wireless main signal FMd2 and a wireless control signal FCd2, and transmits the converted signal to the mobile station 12a. Mobile station 12
a is a wireless main signal FMd transmitted from the wireless base station 102
2 and the wireless control signal FCd2, and the signal routing is completed.

The same process is performed when the mobile station 12a transmits a signal to the mobile station 10a.

FIG. 3 is a diagram showing a configuration of the radio base station 100 in the radio base station network of FIG. The radio base station 100 transmits 900 MH transmitted from the mobile station 10a.
z-band radio main signal FMu0 and radio control signal FCu0
Is received by the antenna 26a and input to the frequency converter 21b via the duplexer 25a. Frequency converter 21
b converts the wireless main signal FMu0 and the wireless control signal FCu0 of the 900 MHz band into the intermediate frequency band main signal IM0 and the intermediate frequency band control signal IC0 of the 70 MHz band, respectively. The duplexer 20b branches the intermediate frequency band main signal IM0 and the intermediate frequency band control signal IC0 into two. From one of the two branched signals, only the intermediate frequency band control signal IC0 is extracted by the filter 22b and input to the demodulator 23a. The demodulator 23a outputs the intermediate frequency band control signal IC0.
, And outputs a control signal C0 specifying the reception frequency of the routing destination radio base station 102 to the control circuit 24a. The control circuit 24a outputs a control signal D0 to the frequency converter 21c in response to the input control signal C0.
The frequency converter 21c determines the conversion frequency based on the control signal D0, and converts the other intermediate frequency band main signal IM0 and the intermediate frequency band control signal IC0, which have been branched into two by the branching device 20b, into an intermediate frequency signal F2 in the 200 MHz band. Convert. The intermediate frequency signal F2 is multiplexed with the signal input to the radio base station 100 from the cable 1d in the multiplexer 27a and output to the cable 1a.

FIG. 4 is a diagram showing a configuration of the radio base station 102 in the radio base station network of FIG. The radio base station 102 receives the intermediate frequency signal F2 frequency-multiplexed from the cable 1b, and splits the signal into two by the splitter 20c. One of the two branched signals is a bandpass filter 2
2c, and frequency components other than the intermediate frequency signal F2 are removed. The intermediate frequency signal F2 is output from the frequency converter 21
At d, the frequency is converted into a radio main signal FMd2 and a radio control signal FCd2 in the 840 MHz band. Frequency-converted wireless main signal FMd2 and wireless control signal FCd
2 is transmitted from the antenna 26b to the mobile station 12a via the duplexer 25b.

FIG. 5 is a diagram showing a configuration of a signal branching unit and a multiplexing unit of the radio base station in the radio base station network of FIG. 1, and the radio base stations 100, 101, 102, 1
Numeral 03 indicates a method of splitting the intermediate frequency signal input from the cable and multiplexing the intermediate frequency signal output to the cable.

FIG. 5A is a diagram showing a method of electrically branching and multiplexing an intermediate frequency signal when wireless base stations are connected to each other by an electric cable. The intermediate frequency signal F0 input from the electric cable 2a is branched into two by an electric splitter 30a into an electric cable 2b and an electric cable 2d. The intermediate frequency signal F0 output to the electric cable 2d is transmitted from an antenna via a tuning receiving circuit, a frequency converter, and the like. In addition, the electric cable 2e from the antenna via a frequency converter or the like.
Is input to the intermediate frequency signal F0 branched to the electric cable 2b by the splitter 30a.
Are combined by the electric multiplexer 31a, and the intermediate frequency signals F0 and F2 are output to the electric cable 2c.

FIG. 5B is a diagram showing a method of branching and multiplexing an optical signal as it is when the wireless base stations are connected by an optical fiber. The subcarrier multiplexed optical signal S0 is subcarrier multiplexed with the radio signal converted to the intermediate frequency. The subcarrier multiplexed optical signal S0 input from the cable 3a is split into two optical fibers 3b and 3d by the optical coupler 32a. The signal S0 branched to the optical fiber 3d is converted into an intermediate frequency signal F0 by the optical-electrical converter 33a, and is tuned from the electric cable 2f to the tuned receiving circuit (the filter 22 in FIG. 4).
a) and transmitted from the antenna via a frequency converter or the like. Also, from the antenna to the frequency converter (in the circuit of FIG. 3, the duplexer 25a, the frequency converter 21
b, the splitter 20b, the filter 22b, the demodulator 23a, the control circuit 24a, the intermediate frequency signal F2 input to the electric cable 2g via the frequency converter 21c)
The optical signal is converted into a subcarrier multiplexed optical signal S2 by the optical converter 34a and output to the optical fiber 3e. Optical fiber 3e
The subcarrier multiplexed optical signal S2 output to the subcarrier multiplexed optical signal S0 input from the optical fiber 3b is
The optical signals are multiplexed by the optical coupler 32b, and the subcarrier multiplexed optical signals S0 and S2 are output to the optical fiber 3c. In the case of this method, when the wavelengths of the electro-optical converters of the respective wireless base stations are close to each other, beat noise occurs. Therefore, it is necessary to manage the wavelength of the light source so that the wavelengths of the electro-optical converters are separated. However, since signal branching can be performed passively by an optical coupler, the reliability of the device can be increased.

FIG. 5 (c) is a diagram showing a method for converting the branching and multiplexing of an optical signal into an electric signal when the wireless base stations are connected by an optical fiber. Subcarrier multiplexed optical signal S input from optical fiber 3f
0 is the intermediate frequency signal F0 by the optical-electrical converter 33b.
And output to the electric cable 2h. Duplexer 3
0b branches the intermediate frequency signal F0 input from the electric cable 2h to the electric cables 2j and 2l. The intermediate frequency signal F0 branched to the electric cable 2j is transmitted from an antenna via a tuning receiving circuit, a frequency converter, and the like. Also, an intermediate frequency signal F2 input from the antenna to the electric cable 2k via a frequency converter or the like.
Are combined with the intermediate frequency signal F0 input from the electric cable 21 by the multiplexer 31b, and the intermediate frequency signals F0 and F2 are output to the cable 2i. The intermediate frequency signals F0 and F2 output to the cable 2i are output from the electro-optical converter 3
The signal is converted into subcarrier multiplexed optical signals S0 and S2 by 4b and output to the optical fiber 3g. In this case,
Although noise and distortion are accumulated in each wireless base station, wavelength management of the electro-optical converter is not required, so that a cheaper configuration is possible.

In this system, the radio base station does not modulate and demodulate the radio main signal, but only detects the control signal necessary for the conversion and routing of the carrier frequency of the radio main signal, so that the processing at the radio base station is easy. Become. In addition, since no special processing is performed when relaying signals at the wireless base station, the format and modulation rate of the signal to be transmitted need only be common to the communicating parties, and signals of different formats are transmitted in the network. Since they may be mixed, a transparent network can be realized.

Also, in the case of the present system, since the radio base station does not modulate and demodulate the radio main signal, even if there are a plurality of radio base stations to which the mobile station can be connected, if the radio base station has an empty channel, Communication is possible simultaneously with a plurality of radio base stations. For example, as in the mobile station 10b in FIG.
When there are a plurality of communicable radio base stations, 100 and 101, in a conventional routing method using a baseband signal, it is necessary to select one of the radio base stations to avoid signal collision. A radio signal that reaches a radio base station that has not been transmitted becomes an interference wave. In the case of this method, since the radio main signal is transmitted between the radio base stations without demodulation into a baseband signal, a signal that has passed through a plurality of radio base stations is a multipath signal at the receiving mobile station. And there is no problem because equalization processing is performed in the time domain.

FIG. 6 is a diagram showing a frequency allocation according to the second embodiment of the present invention. The configuration of the network is the same as that of the first embodiment shown in FIG. FIG. 6 (a)
FIG. 6B shows the frequency allocation of radio signals received from the mobile station 10a in the radio base station 100. FIG.
FIG. 6C shows the frequency allocation of signals transmitted through the wireless base station 102a and the mobile station 12a.
2 shows a frequency allocation of a radio signal transmitted to the mobile station.
As shown in FIG. 6 (b), by setting the intermediate frequency signal transmitted in the cable to the same band as the radio frequency in the first invention, the frequency conversion processing of the receiving unit in the radio base station 102 can be omitted. it can. However, in this case, it is necessary to determine the type or length of the cable so that signal attenuation in the cable is sufficiently small. In addition, it is necessary that all radio frequencies used on the network do not overlap.

FIG. 7 is a diagram showing a frequency allocation of a radio base station network according to the third embodiment of the present invention. The configuration of the network is the same as that of the first embodiment shown in FIG.

FIG. 7A is a diagram showing the frequency allocation of radio signals received from the mobile station 10a in the radio base station 100. Wireless base stations 100, 101, 102, 103
Is a downlink FRd for transmitting a radio signal to a mobile station.
0, FRd1, FRd2, FRd3, and uplink lines FRu0, FRu1, FR that receive radio signals from mobile stations.
A common frequency band of 900 MHz is used for u2 and FRu3. Such a radio frequency arrangement is time-division multiplexed /
Often used in time division duplex wireless systems. As a configuration of the radio base station, a switch that switches the direction of a signal in time is used instead of the duplexers 25a and 25b in FIGS. As in the first embodiment, when transmitting a signal from the mobile station 10a to the mobile station 12a in FIG. 1, the radio base station 100 transmits a 900 MHz band radio main signal FMu0 and a radio control signal FCu0 from the mobile station 10a. Upon reception, only the radio control signal FCu0 is demodulated, and the radio main signal FMu0 and the radio control signal FCu0 are demodulated.
Is converted to a 200 MHz band, and an intermediate frequency signal F2 is output to the cable 1a.

FIG. 7B is a diagram showing the frequency allocation of signals transmitted through the cables 1a and 1b. The 200 MHz band intermediate frequency signal F2 output to the cable 1a is relayed without being demodulated by the radio base station 101, and is input to the radio base station 102 via the cable 1b.

FIG. 7C is a diagram showing a frequency allocation of a radio signal transmitted from the radio base station 102 to the mobile station 12a. The radio base station 102 tunes and receives the intermediate frequency signal F2 input from the cable 1b, converts it into a 900 MHz band radio main signal FMd2 and a radio control signal FCd2, and transmits them to the mobile station 12a. Mobile station 1
The same applies to the case where a signal is transmitted from 2a to the mobile station 10a via the wireless base stations 102, 101, and 100.

FIG. 8 is a diagram showing a frequency allocation of a radio base station network according to the fourth embodiment of the present invention. The configuration of the network is the same as that of the first embodiment shown in FIG.

FIG. 8A shows the frequency allocation of the radio signal received from the mobile station 10a in the radio base station 100, and FIG. 8B shows the frequency allocation of the signal transmitted through the cable 1a and the cable 1b. FIG. 8C shows the frequency allocation of radio signals transmitted from the radio base station 102 to the mobile station 12a. Wireless base stations 100, 10
1, 102 and 103 are downlink lines FRd0, FRd1, FRd2, FRd3 for transmitting radio signals to mobile stations.
In this case, a common frequency band of 800 MHz is used. In addition, radio base stations 100, 101, 102, and 103 receive uplink signals FRu0, FRu0 that receive radio signals from mobile stations.
A common frequency band of 900 MHz is used for u1, FRu2, and FRu3. As in the first embodiment, when transmitting a signal from the mobile station 10a to the mobile station 12a in FIG. 1, the radio base station 100 transmits the radio main signal F in the 900 MHz band.
The carrier frequency of Mu0 and the radio control signal FCu0 is set to 20.
0 MHz band and the intermediate frequency signal F2
output to a. The radio base station 102 converts the tuned received intermediate frequency signal F2 into the 800 MHz band radio main signal FMd.
2 and a radio control signal FCd2, and transmit the signal to the mobile station 12a. In addition, the mobile station 12a sends the radio base station 1
The same applies to the case where a signal is transmitted to the mobile station 10a via 02, 101, and 100.

FIG. 9 is a diagram showing a configuration of a wireless base station network according to the fifth embodiment of the present invention. The configuration of the network is the same as that of the first embodiment shown in FIG. 1, and mobile stations 10a, 11a, and 12a are located in wireless areas z0, z1, and z2, respectively, capable of communicating with a wireless base station. It is assumed that the stations 10a, 11a, and 12a cannot directly communicate with each other.

FIG. 10 is a diagram showing a frequency allocation of a radio base station network according to the fifth embodiment of the present invention. FIG. 10A is a diagram illustrating a frequency allocation of a radio signal received from the mobile station 10a in the radio base station 100. The radio frequency arrangement used by the radio base stations 100, 101, 102, and 103 for communication with the mobile station is the same as in the first embodiment. Here, the radio base station 100 has a plurality of frequency converters so as to be able to output two or more intermediate frequency signals, and transmits a signal received from the mobile station 10a to the mobile station 11a.
a and the procedure for broadcasting to the mobile station 12a will be described below. The radio base station 100 receives the 900M received from the mobile station 10a.
Hz radio main signal FMu0 and radio control signal FCu0
With the intermediate frequency signals F1 and 200 in the 160 MHz band.
The signal is converted into an intermediate frequency signal F2 in the MHz band, frequency-multiplexed, and output to the cable 1a.

FIG. 10B is a diagram showing the frequency allocation of signals transmitted through the cables 1a and 1b.
The 160 MHz band intermediate frequency signal F1 is
1 is tuned. The intermediate frequency F2 in the 200 MHz band is non-regeneratively relayed by the radio base station 101 and tuned to the radio base station 102.

FIG. 10C is a diagram showing the frequency allocation of radio signals transmitted from the radio base station 101 to the mobile station 11a. The radio base station 101 converts the 160 MHz band intermediate frequency signal F1 input from the cable 1a to 820 MHz.
The frequency is converted to the z band, and the radio main signal FMd1 and the radio control signal FCd1 are transmitted to the mobile station 11a.

FIG. 10D is a diagram showing the frequency allocation of radio signals transmitted from the radio base station 102 to the mobile station 12a. The radio base station 102 converts the 200 MHz band intermediate frequency signal F1 input from the cable 1b to 840 MHz.
The frequency is converted to the z band, and the radio main signal FMd2 and the radio control signal FCd2 are transmitted to the mobile station 12a.

As described above, when a plurality of frequency converters are provided so that the radio base station can output a plurality of intermediate frequency signals, a radio signal received from a mobile station can be broadcast to a plurality of radio base stations. .

FIG. 11 is a diagram showing a configuration of a wireless base station network according to the sixth embodiment of the present invention. In FIG. 11, cables 1a, 1b, 1c, and 1d transmit signals counterclockwise to the loop, and cables 1e, 1f, 1g,
1h transmits the signal clockwise to the loop. The functions of the wireless base stations 100, 101, 102 are the same as in the first embodiment. The wireless base station 103 terminates without relaying the input signals from the cables 1c and 1h. By terminating at one place in a double loop configuration as described above, it is possible to prevent a signal relayed by the wireless base station from circulating around the loop and causing interference as a multipath signal.

FIG. 12 is a diagram showing the frequency allocation of the radio base station network according to the sixth embodiment. The radio frequency band used by the radio base stations 100, 101, 102 and 103 and the intermediate frequency band output to the cable are the same as in the fourth embodiment. FIG. 12A shows the wireless base station 10.
0 indicates the frequency allocation of the radio signal received from the mobile station 10a in FIG. 11, and FIG.
FIG. 12 (c) shows the frequency arrangement of the intermediate frequency signals transmitted through 1b, 1c and 1d.
4 shows a frequency arrangement of an intermediate frequency signal transmitting f and 1g. The radio base stations 100, 101, and 102 convert all the received radio signals into a 240 MHz band, which is a frequency band assigned to the radio base station 103, and convert the cables 1a, 1b, 1c, 1e, 1f, and 1h. And outputs the result to the wireless base station 103. The radio base station 103 responds to the intermediate frequency signal input from the cables 1c and 1h.
The wireless control signal is demodulated, frequency-converted again, and a signal is output to a routing destination wireless base station.

By adopting such a configuration, it is not necessary for all the radio base stations to possess information on the radio base stations with which the mobile station necessary for routing can communicate, and one radio base station functioning as a central station Only the base station needs to hold the information necessary for routing.
Therefore, since the function of performing frequency conversion according to the routing destination is concentrated in one wireless base station 103, it is not necessary for each wireless base station to have a frequency converter whose output frequency is variable.

FIG. 13 is a diagram showing a configuration of a wireless base station network according to the seventh embodiment of the present invention. Radio base stations 100 and 103, radio base stations 101 and 103,
The wireless base stations 103 and 102 are connected via cables 1i, 1j, and 1k, respectively. Wireless base station 10
The functions of 0, 101, 102, and 103 are the same as in the sixth embodiment. As described above, even when the network is a star type or a bus type, a wireless circuit can be controlled by having a wireless base station having a routing function at one point of the network as a central station.

[0051]

As described above, the present invention has the following effects in a radio communication system such as a mobile radio and a radio local area network. (1) Since the radio base station does not perform modulation and demodulation of the radio main signal but only detects the control signal necessary for the conversion and routing of the carrier frequency of the radio main signal, the processing at the radio base station is facilitated, and Signal routing between stations can be easily realized. (2) The modulation speed, modulation scheme, and format of a signal transmitted between wireless base stations may be common to a pair of mobile stations that communicate with each other. It is allowed to coexist in the network, so that a transparent network can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a wireless base station network according to first, second, third, and fourth embodiments of the present invention.

FIG. 2 is a diagram illustrating a frequency allocation of a radio signal and a signal transmitted through a cable in the radio base station network of FIG. 1;

FIG. 3 is a diagram illustrating a configuration of a wireless base station 100 in the wireless base station network of FIG. 1;

FIG. 4 is a diagram illustrating a configuration of a wireless base station 102 in the wireless base station network of FIG. 1;

5 is a diagram illustrating a configuration of a signal branching unit and a multiplexing unit of a wireless base station in the wireless base station network of FIG. 1;

FIG. 6 is a diagram illustrating a frequency allocation of a wireless base station network according to the second embodiment of the present invention.

FIG. 7 is a diagram illustrating a frequency allocation of a wireless base station network according to a third embodiment of the present invention.

FIG. 8 is a diagram illustrating a frequency allocation of a radio base station network according to a fourth embodiment of the present invention.

FIG. 9 is a diagram illustrating a configuration of a wireless base station network according to a fifth embodiment of the present invention.

FIG. 10 is a diagram illustrating a frequency allocation of a wireless base station network according to a fifth embodiment of the present invention.

FIG. 11 is a diagram illustrating a configuration of a wireless base station network according to a sixth embodiment of the present invention.

FIG. 12 is a diagram illustrating a frequency allocation of a wireless base station network according to a sixth embodiment of the present invention.

FIG. 13 is a diagram illustrating a configuration of a wireless base station network according to a seventh embodiment of the present invention.

[Explanation of symbols]

1a to 1k cable 2a to 2l electric cable 3a to 3g optical fiber 10a, 10b, 11a, 12a mobile station 20a to 20d, 30a, 30b duplexer 21a to 21f frequency converter 22a to 22d filter 23a, 23b demodulator 24a, 24b control circuit 25a, 25b duplexer 26a, 26b antenna 27a, 27b, 31a, 31b multiplexer 32a, 32b optical coupler 33a, 33b optical-electrical converter 34a, 34b electrical-optical converter 35, 36 optical demultiplexing circuit 37 , 38 Optical multiplexing circuit 100, 101, 102, 103 Radio base station C0, D0 Control signal F0, F1, F2, F3 Intermediate frequency signal FRd0, FRd1, FRd2, FRd3 Base station transmission radio frequency band FRu0, FRu1, FRu2, FRu3 Mobile station transmission radio frequency band FMd1, FMd2 Base station transmission radio main signal FCd1, FCd2 Base station transmission radio control signal FMu0 Mobile station transmission radio main signal FCu0 Mobile station transmission radio control signal IM0 Intermediate frequency main signal IC0 Intermediate frequency control signal S0, S2 Optical signal Z0, Z1 , Z2 wireless area

Claims (6)

(57) [Claims] 1. A mobile station, comprising: a plurality of radio base stations for transmitting and receiving radio signals to and from the mobile station; and a cable for interconnecting the radio base stations, wherein the mobile station and the radio base station are wireless. In a radio base station network for frequency-multiplexing and transmitting a main signal and a radio control signal, each radio base station receives a radio control signal transmitted from the mobile station and demodulates the radio control signal. An intermediate frequency transmitting circuit that converts the wireless main signal into an intermediate frequency signal having a frequency specific to a wireless base station determined according to the demodulated wireless control signal and outputs the intermediate frequency signal to the cable; An intermediate frequency receiving circuit that receives only an intermediate frequency signal having a frequency specific to the radio base station among the intermediate frequency signals that have been set, and an intermediate frequency signal received by the intermediate frequency receiving circuit. And having a radio main signal transmission circuit transmits the number signal destination is converted into a radio main signal to the mobile station,
Wireless base station network. 2. The radio base station according to claim 1, wherein a common frequency band is used in a downlink for transmitting a radio signal to the mobile station and an uplink for receiving a radio signal from the mobile station. The wireless base station network according to claim 1, wherein 3. The radio base station uses a common frequency band for a downlink for transmitting a radio signal to a mobile station, and all the radio base stations receive a radio signal from the mobile station. The radio base station network according to claim 1, wherein a common frequency band is used for a line, and frequency bands of the downlink and the uplink are different from each other. 4. An intermediate frequency transmitting circuit of the radio base station includes a plurality of frequency converters, and converts a radio main signal transmitted from the mobile station into a plurality of intermediate frequency signals and outputs the signals to the cable. The wireless base station network according to claim 1, wherein: 5. A mobile station, a plurality of radio base stations for transmitting and receiving radio signals to and from the mobile station, and a cable for connecting the radio base stations to each other, wherein the mobile station and the radio base station are radio base stations. In a radio base station network for frequency-multiplexing and transmitting a signal and a radio control signal, each radio base station receives a radio control signal transmitted from a mobile station and demodulates the radio control signal; A radio frequency transmission circuit that converts a main signal into a radio frequency signal having a frequency specific to a radio base station determined according to the demodulated radio control signal and outputs the radio frequency signal to the cable, and is output on the cable. A radio frequency receiving circuit that receives only a radio frequency signal of a frequency specific to the radio base station among radio frequency signals; and a radio frequency signal received by the radio frequency receiving circuit. The and having a radio main signal transmitting circuit for transmitting towards the destination mobile station, the radio base station network No.. 6. A mobile station, a plurality of radio base stations for transmitting and receiving radio signals to and from the mobile station, a central station for transferring a signal received from the radio base station to another radio base station, a radio base station and a central station. A cable for connecting stations to each other, wherein the mobile station and the wireless base station frequency-multiplex and transmit a wireless main signal and a wireless control signal, and each of the wireless base stations includes: An intermediate frequency transmission circuit that converts the radio main signal and the radio control signal transmitted from the mobile station to an intermediate frequency main signal and an intermediate frequency control signal having a frequency unique to the central station, and outputs the converted signal to the cable; An intermediate frequency receiving circuit that receives only an intermediate frequency main signal having a frequency unique to the radio base station among the intermediate frequency main signals output on the cable; A radio main signal transmitting circuit for converting the intermediate frequency main signal received by the frequency receiving circuit into a radio main signal and transmitting the radio main signal to the mobile station, wherein the central station outputs the intermediate signal outputted on the cable. An intermediate frequency receiving circuit that receives only an intermediate frequency main signal and an intermediate frequency control signal having a frequency unique to the central station among the frequency main signal and the intermediate frequency control signal; and an intermediate frequency control signal demodulation that demodulates the intermediate frequency control signal. And an intermediate frequency transmission circuit that converts the intermediate frequency main signal into an intermediate frequency main signal of a frequency unique to the radio base station determined according to the demodulated intermediate frequency control signal and outputs the intermediate frequency main signal to the cable. Each radio base station transmits the radio main signal and the radio control signal transmitted from the mobile station to an intermediate frequency main signal having a frequency unique to the central station and The central office demodulates the intermediate frequency control signal received from the cable and outputs the intermediate frequency main signal to the radio base station determined according to the demodulated intermediate frequency control signal. The base station converts the signal into an intermediate frequency main signal having a frequency unique to the station and outputs the signal to the cable, and the radio base station determined according to the demodulated intermediate frequency control signal converts the intermediate frequency main signal received via the cable into a radio signal. A radio base station network, which converts the signal into a frequency main signal and transmits the signal to a destination mobile station.