JPH06177819A - Radio communication system - Google Patents

Abstract

PURPOSE:To provide a radio communication system which can flexible connect between exchange stations and the base station, etc. CONSTITUTION:Concerning a radio communication system provided with an exchange station 2, plural base stations 3 connected to the exchange station 2 and one or more mobile equipments 4 connected through radio lines 6 to the base stations 3 inside the zones of those base stations 3, the exchange station 2 and the base stations 3 are connected by radio lines 5. The exchange station 2 is provided with a spread modulating/demodulating means for modulating/ demodulating signals transmitted between the exchange station 2 and the base stations 3 by spread codes in code dividing multiple transmission, and the base station 3 is provided with a spread modulating/demodulating means for modulating/demodulating signals transmitted between the base station 3 and the exchange station 2 by the spread code in the code dividing multiple transmission. Thus, the signal transmission between the exchange station 2 and the respective base stations 3 is performed by the system of code dividing multiplex transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching center, a plurality of base stations connected to it directly or via one or more control stations, and a mobile unit connected to these base stations via a wireless line. The present invention relates to a wireless communication system including a machine.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing a conventional wireless communication system. In the figure, 20 is an exchange station in the telecommunication network 1, 30 is a base station connected to the exchange station 20 via a wired transmission line 8, and 4 is a wireless line 6 in a zone 7 of each base station 30.
Is a mobile device connected to the base station 30.

In such a wireless communication system, the base station 30 is installed at an appropriate place outdoors or indoors, and the exchange 2
0 and the wired transmission line 8 are connected. The exchange 20 and the base station 30 communicate with each other via the wired transmission path 8. The base station 30 and the mobile device 7 are connected to the zone 7
Inside, the control signal and the call signal are transmitted and received by the time division multiplex transmission method or the frequency multiplex transmission method using the wireless line 6.

Further, as a conventional wireless communication system, FIG.
There is also a method shown in. In the system shown in FIG.
The control station 90 is provided between the control station 90 and the plurality of base stations 300. Between the switching center 200 and the control station 90 and the control station 90
And each base station 300 are connected by a wired transmission line 8. The control station 90 then controls the plurality of base stations 300.
Wireless channel allocation control.

[0005]

Since the conventional wireless communication system is configured as described above, it has the following problems. That is, since the transmission path between the exchange 20 and the base station 30 or between the exchange 200 and the base station 300 is configured by the wired transmission path 8, the installation locations of the base stations 30 and 300 impose restrictions on the transmission path installation. However, the zone cannot be flexibly configured.

In addition, for example, when the mobile station 7 moves from one zone to another zone around the zone, information exchange between the zones necessary for zone switching is performed, and a signal is transmitted between the base stations 30 and 300. When transmission and reception are required, it is necessary to perform signal transfer via the exchanges 20 and 200, or to lay a unique wired transmission path between the base stations.

Therefore, it is an object of the present invention to provide a wireless communication system capable of flexibly realizing connection between a switching center-base station, a switching center-control station, a control station-base station, or each base station. .

[0008]

According to a first aspect of the present invention, there is provided a wireless line connecting an exchange station and a base station, and the exchange station uses a spreading code in code division multiplex transmission to It has spreading modulation / demodulation means for modulating / demodulating a signal transmitted to / from a base station, and the base station has a spreading modulation / demodulation means to modulate / demodulate a signal transmitted to / from an exchange station by a spreading code in code division multiplexing transmission. I have.

According to the second aspect of the present invention, there is provided a wireless communication system in which a wireless line connecting a control station and a base station is
Or the wireless line connecting the exchange and the control station
Or, there are both wireless links, and the switching station, the control station, and the base station that are connected via the wireless link are
It has a spreading modulation / demodulation means for modulating / demodulating a signal transmitted on a wireless line by a spreading code in code division multiplex transmission.

In the wireless communication system according to the invention as defined in claim 3, there is a wireless line connecting between the base stations, and the base stations are connected by the wireless line by the spread code in the code division multiplex transmission. In addition, it has a spread modulation / demodulation means for modulating / demodulating a signal transmitted to / from another base station.

[0011]

In the present invention, all or a part between the exchange station and the base station, all or a part between the control station and the base station, all or a part between the exchange station and the control station, or each All or part of the base stations are connected by wireless lines,
Each connected station identifies a channel by code division and performs multiplex transmission.

[0012]

1 is a block diagram showing a wireless communication system according to a first embodiment of the present invention. In the figure, reference numeral 2 denotes an exchange in the telecommunication network 1, which is connected to a plurality of base stations 3 by a wireless line 5. Reference numeral 4 denotes a mobile device, which is connected to the base station 3 in the zone 7 by the wireless line 6 as in the conventional system.

FIG. 2 is a block diagram showing essential parts of the exchange 2 and the base station 3. As shown in the figure, the exchange 2
Base station 23 and speed conversion / slot distribution / assembly 24
Including and The speed conversion / slot distribution / assembly unit 24 is connected to a switching circuit (not shown) of the switching center 2 and performs speed conversion of signals, signal distribution to slots and signal extraction from slots for time division multiplexing. To do. The exchange 2 is connected to other exchanges, subscriber information storage devices, and the like.

In the base station unit 23, on the transmission side, a frame configuration unit 231 that performs signal frame configuration, a spread modulation unit 232 that performs modulation using a specific spreading code, and information modulation that performs normal PSK modulation and the like. An information demodulation unit 234 for performing normal demodulation is provided on the receiving side.
Spreading demodulation unit 23 that performs inverse modulation using a specific spreading code
5, and a frame reconstructing unit 23 for decomposing the frame
6 is provided.

The base station 3 also includes a pair exchange station section 33 and a pair mobile station section 34. In the switching center section 33, on the transmission side, a frame configuration section 33 that performs signal frame configuration
1, a spread modulator 332 that performs modulation using a specific code,
An information modulator 333 for performing normal PSK modulation and the like is provided, and an information demodulator 33 for performing normal demodulation is provided on the receiving side.
4. Spreading demodulation unit 33 that performs inverse modulation using a specific code
5, and a frame reconstructing unit 33 for decomposing the frame
6 is provided. The mobile unit 34 includes a transmitter 341 that transmits a signal to the mobile unit 4 and a receiver 3 that receives a signal.
42 and 42.

Next, the operation will be described. The exchange 2 and the base station 3 perform signal transmission / reception through the wireless line 5,
Multiplex transmission is performed by the code division multiplexing method. That is, when transmitting a signal to a certain base station 3, the spread modulator 232 of the exchange 2 performs modulation using the code assigned to that base station 3. The spread demodulation unit 335 of the base station 3 demodulates a signal (information demodulation unit 3) obtained by demodulating a wireless signal received from the wireless line 5.
34 output) is inversely modulated using the code assigned to the base station 3. Therefore, a unique channel is assigned between the base station 3 and the exchange 2 by code division.

When the base station 3 transmits to the exchange 2, the spread modulator 332 of the base station 3 similarly.
Performs the modulation using the code assigned to the base station 3, and the spreading demodulation unit 235 of the exchange 2 performs the inverse modulation using the code assigned to the base station 3.

As described above, since the channels are identified by the code division between the exchange 2 and the base station 3 and the multiplex transmission is performed, the line can be easily set / switched by setting the spread code. In addition, wireless transmission is generally susceptible to delay in a multipath multiplex transmission line, but it is also possible to overcome the delay by using a RAKE receiver or the like in the code division multiplex transmission system. Furthermore, the code division multiplex transmission has excellent interference resistance and can be repeatedly used at the same frequency. In addition, when the code division multiplex transmission system is applied between the base station and the mobile station, the so-called near-far problem (the reception level of the mobile device in the zone varies depending on the distance from the base station, When a high signal wave and a signal wave with a low reception level overlap, the lower signal wave cannot be detected.) Therefore, complicated transmission power control that adjusts the strength of the radio wave for each communication is required. , The transmission power control is easy when the code division multiplex transmission system is applied between fixed stations such as the switching station and the base station 3. Therefore, the application between the switching center and the base station 3 is useful.

Although it is shown in FIG. 1 that the wireless line 5 is set up between all the exchanges 2 and the base stations 3, the wireless line 5 is provided only between the required exchanges 2 and the base stations 3. 5
May be set.

FIG. 3 is a block diagram showing a wireless communication system according to a second embodiment of the present invention. In this case, the base station 31
The mutual signal transmission is realized by the code division multiplex transmission system in the wireless line 5.

FIG. 4 is a block diagram showing essential parts of the exchange 21 and the base station 31. As shown in the figure, the base station 3
1 includes an exchange-to-exchange station unit 35, a mobile-to-mobile unit unit 34, and a base station unit 36. In the base station unit 36, the transmitting side is
A frame configuration unit 361 that performs signal frame configuration, a spread modulation unit 362 that performs modulation using a specific code, and an information modulation unit 363 that performs normal PSK modulation and the like are provided.
An information demodulation unit 364 that performs normal demodulation, a spread demodulation unit 365 that performs inverse modulation using a specific code, and a frame reconstruction unit 366 that decomposes frames are provided on the receiving side. The base station unit 25 and the base station 31 of the exchange 21 are
Although it is connected to the pair exchange station section 35 by the wired transmission line 8, it may be connected by a code division multiplex transmission system using a wireless line.

In this case, the signal transmission between the base stations 31 is performed by the code division multiplex transmission system. Therefore, regarding the transmission, the transmission between the exchange 2 and the base station 3 in the first embodiment is performed. Has the same effect as the effect of. Also in this case, the wireless line 5 may be provided between all the base stations 31 or only between the required base stations 31.

FIG. 5 is a block diagram showing a wireless communication system according to a third embodiment of the present invention. In this case, the exchange 22
One or more control stations 9 are provided between each base station 32 and each base station 32 (FIG. 5 shows the case where there is one control station). The exchange 22 and the control station 9 are connected by a wired transmission line 8,
Signal transmission between the control station 9 and the base station 32 is performed by the wireless line 5
It is realized by the code division multiplex transmission system in.

FIG. 6 is a block diagram showing essential parts of the control station 9 and the base station 32. As shown in the figure, the base station 32
Includes an anti-control station section 37 and an anti-mobile station section 34. In the control station section 37, the transmission side is provided with a frame configuration section 371 that performs signal frame configuration, a spread modulation section 372 that performs modulation using a specific code, and an information modulation section 373 that performs normal PSK modulation and the like. On the receiving side, an information demodulation unit 374 that performs normal demodulation, a spread demodulation unit 375 that performs inverse modulation using a specific code, and a frame reconstruction unit 376 that decomposes frames are provided.

In this case, the signal transmission between the control station 9 and the base station 32 is performed by the code division multiplex transmission system. Therefore, regarding the transmission, the exchange 2 in the first embodiment is used.
-The same effect as that at the time of transmission between the base stations 3 is obtained.

Although the exchange 22 and the control station 9 are connected by the wire transmission line 8, they may be connected by a code division multiplex transmission system using a wireless line. In that case, the switching center 22 has a configuration including a spreading modulation section and a spreading demodulation section, and the control station 9 further includes a pair switching center section including a spreading modulation section and a spreading demodulation section. Also, FIG.
In the configuration shown in (1), a wireless line may be further provided between the base stations, and signal transmission between the base stations 32 may be performed by a code division multiplex transmission system.

[0027]

As described above, according to the present invention, the wireless communication method is such that the exchange station and the base station, the exchange station and the control station, the control station and the base station, or each of them. Since the base stations are connected by a wireless line, and each connected station identifies a channel by code division and performs multiplex transmission, switching stations-base stations, switching stations-control stations, control stations-base stations. while,
Alternatively, there is an effect that it is possible to flexibly realize the connection between the base stations and to provide a method in which flexibility in zone configuration is further enhanced. Moreover, there is also an effect that it is possible to provide a method that can easily cope with interference and delay which are problems in wireless communication.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing main parts of a switching center and a base station.

FIG. 3 is a configuration diagram showing a configuration of a wireless communication system according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing main parts of a switching center and a base station.

FIG. 5 is a configuration diagram showing a configuration of a wireless communication system according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing main parts of a control station and a base station.

FIG. 7 is a configuration diagram showing a configuration of a conventional wireless communication system.

FIG. 8 is a configuration diagram showing a configuration of another conventional wireless communication system.

[Explanation of symbols]

2,21,22 Exchange station 3,31,32 Base station 4 Mobile unit 5 Radio link 9 Control station 23,25 Base station section 24 Speed conversion / slot distribution / assembly section 33,35 Exchange station section 34 Pair mobile station section 36 Base station section 37 Control station section 91 Base station section 92 Speed conversion / slot distribution / assembly section 231, 331, 361, 371, 911 Frame configuration section 232, 332, 362, 372, 912 Spread modulation section 233, 333, 363 373, 913 Information modulator 234, 334, 364, 374, 914 Information demodulator 235, 335, 365, 375, 915 Spread demodulator 236, 336, 366, 376, 916 Frame reconstructor 341 Transmitter 342 Receiver

Claims (3)

[Claims] 1. A radio including an exchange, a plurality of base stations connected to the exchange, and one or more mobile units connected to the base station via a radio line in a zone of each base station. In the communication system, a wireless line connecting the exchange station and the base station is provided, and the exchange station has a spreading modulation / demodulation means for modulating / demodulating a signal transmitted to / from the base station by a spreading code in code division multiplex transmission. The wireless communication system, wherein the base station has a spreading modulation / demodulation unit that modulates / demodulates a signal transmitted to / from the switching center by a spreading code in code division multiplex transmission. 2. A switching center, a plurality of base stations connected to the switching center via one or more control stations, and a base station connected to the base station via a wireless line in a zone of each base station. In the wireless communication system including the above mobile device, a wireless line connecting between the control station and the base station, or a wireless line connecting between the exchange station and the control station,
Alternatively, both of the switching stations, the control station, and the base station, which are provided with both wireless circuits, are connected via the wireless circuits to modulate / demodulate the signal transmitted on the wireless circuit by a spread code in code division multiplex transmission. A wireless communication system characterized by having spreading modulation / demodulation means. 3. An exchange station, a plurality of base stations connected to the exchange station directly or via one or more control stations, and within the zone of each base station via a radio line to the base station. A wireless communication system including one or more mobile devices to be connected, comprising a wireless line connecting between the base stations, the base station being connected by a wireless line by a spreading code in code division multiplex transmission. A wireless communication system characterized by having spreading modulation / demodulation means for modulating / demodulating a signal transmitted to / from the base station.