JPH09252490A - Radio base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a communication line into time division multiple access and to improve channel efficiency by performing spread spectrum modulation based on a spread code, making signals into time division multiple access, arranging them in a time slot and transmitting them. SOLUTION: A central controller 240 stores the selected time slot on a highway 260 in a time slot memory 215-2 inside a buffer memory 215 in a No.1 modem 210 through a signal reception distribution device 230. Thereafter, a time switch slot 215-1 is closed, the information of 8 bits which enters a shift register 215-3 is immediately transferred to the shift register 215-4 and the shift register 215-3 prepares for the reception of the signals of the next frame. Data and a control bit are added after the transferred information of 8 bits and they are sent to the spread modulator 211 of the No.1 modem 210, spread spectrum modulated by an outgoing PN code supplied to a #m1 terminal equipment, amplified and then, transmitted from an antenna 500.

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to voice, data, images, etc.
Related to the telephone exchange system for exchanging and connecting information of
A communication terminal device such as a telephone and a data terminal device,
Wireless transmission lines between switching devices, and
Related to a wireless base station whose digital transmission path is
You. Taking a wireless telephone system as an example,
Car phones and wireless phones have been put to practical use. Before
In the case of wireless communication, the
Therefore, phase modulation and frequency modulation are adopted. For example,
"New edition, mobile communication system" published by Kagaku Shimbun (1979)
Issued May 10th (hereinafter referred to as "Reference 1") No. 23
An overview can be found in Sections 9-260. The latter is generally
In general, a cable is pulled from the telephone office to the subscriber's premises.
Wireless within the subscriber's premises.
Number modulation is often used. (Reference 1, No. 294
Paragraphs to Paragraph 301) In addition, the test is relatively close to the use environment targeted by the present invention.
System has been tried, but adopts the phase modulation method.
The switchboard is also a crossbar system, so confidentiality and
The problem of noise and interference resistance has not been solved. (Reference text
(Page 1, 291 to 294) Digital exchange
For example, Japanese Patent Application Laid-Open
No. 59-58927. [0003] The above-mentioned prior arts are exchangeable.
The wireless transmission path between the device and the communication terminal device is of analog type.
Since it is used, there are problems with confidentiality, noise resistance, and interference resistance.
Yes, and telephone exchanges that use the digital exchange
The compatibility with the replacement system is not very good.
Was. An object of the present invention is to provide an analog wireless system as described above.
To improve the problems of the wireless base station used,
Line base station, and more specifically, telephone
Enables wireless communication between communication terminals and switching equipment
Improve confidentiality and noise immunity, and digital communication.
Suitability for telephone switching systems that adopt the replacement method
It is to provide a radio base station in which is improved. Also,
In switching equipment, it does not depend on the number of wireless terminals,
Provide a terminal interface according to the traffic
For example, the interface should be controlled appropriately.
Exchange operation of many wireless terminals is possible with economical configuration
In providing a wireless base station. In addition, wireless
When connecting and exchanging the other party who communicates with the terminal
Flexible connection with no restrictions and switch connection
Wireless system for easy installation such as installation and system setting and setting change
It is to provide a base station with a simple configuration. And nothing
Even if the line terminal is moved and used in various places,
Since the problems are solved and the above problems are satisfied,
And provide a distributed wireless base station that is easy to use.
And there. In addition, the communication channel is time-division multiple access
More call channels
A wireless base station capable of providing [0004] To solve the above problems,
In addition, the wireless base station of the present invention is connected to a terminal device via a wireless line.
In the wireless base station that connects the
Control means for controlling the connection with the storage device, and the control means
Spread spectrum modulation based on the selected spreading code
Spread spectrum modulation means and the spread spectrum modulation
The signal modulated by the adjustment means is time-division multiplexed and
Time division multiplex means for arranging in a lot, and the time division multiplex
And a transmitting means for transmitting a signal arranged in a digitized manner. In order to solve the above problems, the present invention
Wireless base station acquires synchronization with the terminal device.
More than the time slots used for communication.
A structure for transmitting a signal for synchronization acquisition using a time slot.
Have With the above configuration, the communication terminal device and the exchange device
It enables wireless communication between users and improves confidentiality and noise immunity.
Phone with digital switching system
It is possible to improve compatibility with exchange systems.
Become. Embodiments 1. SUMMARY OF THE INVENTION The present invention relates to a communication terminal device and a time division multiplexing exchange device.
Introduced spread spectrum modulation and demodulation technology to the information transmission of
Install the spread spectrum modulator / demodulator in the central controller of the exchange.
By controlling the position of the storage
System, especially the wireless switching system
Things. Connection between terminal equipment and switching equipment in the office
When making wireless, the terminal device is not in use.
You can think that it is stationary, and you are communicating in mobile radio etc.
We do not consider the problems caused by the movement of the terminal device. Ma
The distance between the terminal device and the antenna on the exchange side is also
Installed in each room or a leaky coaxial cable on the ceiling, etc.
It is possible to make them almost even by installing them.
The terminal device side compensates for the distance difference from the antenna.
Spread spectrum without controlling the transmission power for
Communication becomes possible. In addition, transmitting from one antenna
The reach of radio waves is not in the same room or on the same floor.
Because it can be limited to a relatively narrow range,
It is possible to use radio waves effectively. Spect
Pseudo-noise codes for ram spread modulation and demodulation are also used in offices.
The number of terminals in the same system is too large
On the other hand, the difficulty of signal decoding
It is considered that a high degree of confidentiality like in
Therefore, a relatively simple code can be used. That is,
A spread spectrum modulator / demodulator can be simplified. Based on such a premise, the present invention provides a terminal device.
Device and the switching device, respectively,
Set up a transceiver including a similar noise code generator, antenna, etc.
For example, whether the reach of the radio waves transmitted from each antenna
Within a certain area, the number of pseudo-noise codes that do not overlap is reduced.
It is given to each terminal device at least. In the case of originating from the terminal device, the terminal device
Is the spectrum with the pseudo-noise code given to the terminal.
Transmits a calling signal that has been spread-spectrum modulated and sends it to the demodulator of the switching equipment.
In this case, this signal is captured and the captured pseudo-noise code is
Or the information transmitted by this code is stored in the switching device.
The central control unit recognizes the calling terminal device.
Separate. The central controller calculates the pseudo noise code of the calling terminal.
Set the spread-spectrum modulator on the switching equipment side,
Set the downlink channel to the end device. In the case of an incoming call to the terminal device, in the exchange device
Since the called number is sent to the central control unit of
The called terminal device is identified from the number, and the corresponding switching device side
The pseudo-noise code of the spread spectrum modulator and demodulator is
Set it to the code of the call terminal and set the control signal of the terminal to this
Calling the called terminal by sending it on the channel
put out. The above has been explained for both the case of making a call and the case of making a call.
After setting the channel between the terminal device and the switching device depending on the method
For example, for voice, 8 bits of 8000 samples / second
Companded PCM code is a pseudo-noise code given to a terminal device
No. is transmitted and received after spread spectrum. In this way,
A communication system with high confidentiality and strong anti-jamming can be realized.
You. The spread spectrum and direct frequency
Several modulation methods are considered, such as several hopping
However, the present invention does not depend on the modulation method. FIG. 4 shows an example of a communication system in a building.
Then, a cable 400 from the outside, for example, a local line comes in.
Place the main exchange unit 300 on each floor,
The exchange device 200 is installed, and the main exchange device 300 and each child exchange device are installed.
The conversion device 200 includes a cable 600, for example, an optical fiber cable.
-, Connected to each other via node device 610
I have. The main exchange apparatus 300 and the child exchange apparatus 200 are
Connected to the antenna 500, for example, a leaky coaxial cable.
You. The terminal device 100 is a combined voice / data terminal device.
And a switching device 2 through the antenna 500.
00 or 300 is wirelessly connected. this
In a communication system, switching devices 200/300 and terminals
Since the wireless connection between the end devices 100, installation work
Installs the switching device 200/300 and the node device 61.
0, connection with external cable 400, antenna 5
00 and the exchange device 200/300
No wiring is required between the terminal device 100 and the terminal device 100. further
An optical fiber is used for the cable 600 to perform time division multiplexing.
If so, there is no need to distribute a large amount of cables,
Things become very easy. FIG. 1 and FIG. 2 show the main exchange device in FIG.
The apparatus 300 or the child exchange apparatus 200 is related to the present invention.
FIG. 3 shows the first and second embodiments of the part, and FIG.
An example of the terminal device 100 is shown. Hereinafter, using FIG.
The first embodiment will be described in detail. 2. a First Embodiment In this embodiment, as shown in FIG.
Depending on the hicks, it is possible to change the number of simultaneous calls / communication
Since the demodulation device 210 handles information for only one line, it is slow
There is a feature that works with. The terminal device 100 and the exchange device 2 in FIG.
Information between 00 and 300 is an integral
De-service digital network (ISDN:
Standardized as Integrated Services Digital Network)
64 kb / s for voice or data
Channel B and 16 kb / s channels for data and signals
It shall consist of Channel D. Fig. 5 shows the inside of the switching device.
Above on the way and on the transmission line between the exchange and the terminal
It shows the relationship between channels B and D. FIG.
(A) is a case of voice-centric information, and is B + D information with the terminal device.
Fig. 5 (b) becomes the standard of ISDN when exchanging
A place for exchanging B + B + D information, which is considered to be
It is. The frame in FIG. 5 (a) means 8000 per second.
Audio is sampled at a sample rate of 1 sample
It is equivalent to 125us in the time of one minute. In this frame
n time slots are time-division multiplexed and one
Each time slot, eg TS0, consists of 8 bits
ing. When sending to the transmission line to the terminal device,
2 bits as a channel are added and expanded in time to obtain 8 bits.
It is sent at a rate of 0 kb / s. Sent from the terminal
On the other hand, the information that came in has 2 bits of the D channel removed.
At a specified tie on the highway, compressed in time
Inserted into the memory slot. Further, FIG.
In the case of + B + D, the signal speed with the terminal device is 144 kb
/ S. In the figure, B + B is the time slot
Although TS0 and TS1 are assigned, they are not always adjacent
Not limited to imslots, and different highways
It is possible. In this embodiment, for simplification, as shown in FIG.
The case will be described. First, in the case of no call / communication state, as shown in FIG.
In the switching device 200/300, the central controller 24
0 is a modulation / demodulation device 210 via a signal reception / distribution device 230.
To prepare for call detection. That is, the central control unit 240
Specifies the vacant modulator / demodulator 210, and if the preamble
If the period is adopted, the modulation / demodulation device 210 is simulated.
Call to the noise code generator (hereinafter referred to as PN generator) 213
Pre-an assigned to the terminal device 100 to be detected
PN code and pseudo-noise code (hereinafter referred to as PN code)
Then, the spread demodulator 21 uses the preamble code for synchronization acquisition.
2 is driven. For call detection of multiple terminal devices
At this time, the central control unit 240 controls the modem unit 210.
After a sufficient time for the demodulation unit to acquire the synchronization,
Preamble code of the terminal device 100 that may make a call
And PN code to sequentially switch and drive to detect a call.
Good. In this case, a plurality of modulation / demodulation devices 210 are used, and at the same time
A plurality of call detections can also be performed. That is, in the known switching device, the central control system is used.
The device spatially scans the line interface circuit
On the other hand, in the exchange device of the system of the present invention,
The central controller 240 uses the modulator / demodulator 210,
The preamble code and PN code of the spread demodulator 212 are sequentially
Switch to the next scan to start when synchronization is acquired.
Will be considered a call. In addition, given to the same terminal device
PN code is transmitted (transmission from terminal equipment to switching equipment)
And the downstream (transmission from the switching equipment to the terminal equipment)
In this case, the PN code set in the spread demodulator 212 is
It becomes the code for going up. Next, also in the terminal device 100,
When not in a call / communication state, spread demodulation in FIG.
Only the generator 112 is generated by the PN generator 113.
In addition, synchronization acquisition operation using downlink preamble code of own terminal device
And preparing to receive. 2. a. 1 Calling operation First, the calling operation of the terminal device will be described with reference to FIGS.
-A description will be given using a chart. Transmission / reception in the # m1 terminal device 100 of FIG.
When the container is raised (601 in FIG. 6), the control device 1 shown in FIG.
40 detects this (not shown). The controller 140
PN generator 113 via interface circuit 150
Then, the uplink preamble code is supplied to the spread modulator 111.
, And the preamble signal from the spread modulator 111.
Is sent. The uplink preamble code of the local terminal device
The spread spectrum modulated preamble signal is
It is amplified to a predetermined power at 120,
It is transmitted (602 in FIG. 6). Preamble transmitted from antenna 130
1 is received by the antenna 500 of FIG.
It is amplified by 220 and spreads all the modems 210.
It is input to the adjuster 212. Now, No. 1 modem 21
0 spread demodulator 212 is a
By the control for outgoing, the # m1 calling terminal device goes up
If it is set to the preamble code, the sync
The path 214 is activated and synchronously acquired (FIG. 6, 611). In the switching device 200/300, No. One change
When the synchronization is acquired from the synchronization circuit 214 of the demodulator 210,
The signal to say is transmitted through the signal receiving / distributing device 230 to the central system.
Sent to the control device 240. The central control device 240 is no.
The spread demodulator 212 of the first modulator / demodulator 210 is a # m1 terminal device.
Knows that it was synchronized with the upstream preamble code,
It is identified that the # m1 terminal device has originated the call (see FIG. 6, 61).
2). The central control unit 240 is No. 1 modem
# M1 terminal device 1 with respect to the spread modulator 211 of the device 210
00 preamble code and PN code of PN code
This is set in the generator 213 (FIG. 6, 613). This
The spread modulator 211 transmits and receives the downlink preamble signal.
Transmitter 220 transmits through antenna 500. # M1 The calling terminal device 100
Pass the amble signal through the antenna 130 and the transceiver 120
Received by the spread demodulator 112 and controlled by the synchronization circuit 114.
(603 in FIG. 6). As a result,
# M1 terminal device 10 confirms that the downlink is synchronously acquired.
Since 0 can be confirmed, the uplink spread spectrum code
Is switched from the preamble code to the PN code for communication,
Thereafter, the synchronization circuit 114 continues the synchronization tracking. Prior to switching
Thus, the terminal device 100 multiplies the switching signal by the preamble signal.
To the spread demodulator 212 of the exchange 200,
Spreading modulator 111 on the storage side and spreading demodulator 21 on the switching device side
2 switches to the PN code while synchronizing (Fig.
6, 604, and FIGS. 6, 615). In the switching device 200, the spread demodulator 212 is
Switching from preamble code to PN code for communication
Accordingly, the terminal device 100 also outputs the downlink preamble signal.
Check that synchronization has been acquired and switch to the downlink preamble signal.
And send it in the same direction as the uplink line.
Switch line from preamble code to PN code for communication
(FIGS. 6, 616 and 6, 605). By the above operation, the terminal device 100,
Since the bidirectional line between the switching devices 200 has been set up,
The switching device 200 sends a dial tone to the calling terminal device.
It is sent out (617 in FIG. 6), and dial monitoring is started. this
Subsequent operation of the exchange device is similar to that of a known exchange device.
It is performed. Communication after line setting is as described in Fig. 5.
For call and high speed data, B channel is used for control signal
And low-speed data are performed using the D channel. The operation after the transmission of the dial tone is shown in FIGS.
A brief description will be given by using. The central control unit 240 is No. 1 modem
The spread code of the spread modulator 211 of the unit 210 is the preamble.
The switch from the code to the PN code is performed by the PN generator 213.
From the signal receiving / distributing device 230, the dial tone
Sending circuit (not shown) and No. 1 modulator / demodulator 210
, For example, transmission highway 261, switching net
Free time through work 250 and receiving highway 260
Select a slot and connect. Switching net here
The work 250 has a time switch and a space switch.
Alternatively, it may be a combination of both. When the above connection is made, the central control unit 2
No. 40 is passed through the signal receiving and distributing device 230, 1 reversion
Time in the buffer memory 215 of the adjusting device 210
Reception highway 26 selected for slot memory 215-2
The time slot on 0 is stored. After that time
In the slot, time slot switch 215-1
Is closed, and the 8-bit encoded dial tone is shifted to the shift register 21.
Receive at 5-3. To shift register 215-3
The 8-bit information entered is immediately transferred to another shift record.
Transferred to the register 215-4 and the shift register 215-
3 is for receiving the signal of the time slot of the next frame.
Prepare. 8 transferred to the shift register 215-4
The bit information is followed by a total of 2 bits of data and control bits.
Are added under the control of the central controller 240 (see FIG. 1).
The hatched portion of the shift register 215-4), FIG.
As shown in (a), the spread modulator 2 is operated at a speed of 80 kb / s.
Downlink P sent to # 11 and given to the # m1 terminal device
Spread spectrum modulation with N code
The signal is amplified and transmitted from the antenna 500. # M1 terminal device 100
As shown in FIG.
Then, it is input to the spread demodulator 112. In the spreading demodulator 112, its own terminal device (#m
Demodulate with the downlink PN code of 1) and control the control device 140.
Therefore, through the interface circuit 150, the B channel
Only the signal is taken out, and the PCM demodulator 162 has a predetermined speed.
Converted to and sent out. 800 in the PCM demodulator 162
8-bit code sent at a rate of 0 samples / second
Converts to an analog signal and operates the handset 164 with specified power
Let the caller hear the dial tone. The calling party uses the dial 165 to connect to
Dialing the number
-Detecting this via the interface circuit 150, the interface
The spread modulator 111 shown in FIG.
Input a predetermined code at the position of the channel and enter the upstream PN code
, And then amplifies it with the transceiver 120 and
It is transmitted from NA 130. On the side of the exchange, this radio signal is transmitted as shown in FIG.
After being received by the antenna 500 and amplified by the transceiver 220
The signal is demodulated by the spread demodulator 212 and the signal is transferred to the shift register 2
It is sent to 16-4. Control signals are hatched in the figure
Since it is input to the part, this part is received by the signal receiving / distributing device 2
Via 30, it is read by the central control unit 240. After receiving the predetermined dial, the central control unit
The device 240 identifies the called terminal device and performs a calling operation.
A free channel with the calling terminal device, that is, the calling terminal
Free time slots on both the transmitting and receiving highways on the device side
Available on both the sending and receiving highways of
Select a time slot and pass it through the signal
Then, the time slot memo of the calling and called terminal device 210
To the 215-2 and 216-2, the selected time slot
Write the unit number. On the other hand, switching network
Controlling 250, calling side time slot and called side time
Connect the slots. 2. a. 2. Incoming call operation Next, the call operation of the called terminal device will be described with reference to FIGS.
This will be described with reference to the flowchart of No. 7. In FIG. 1, the central controller 240 dials
When (Called number) is received (711 in FIG. 7), the number is
Identify which terminal device it belongs to. Now the called terminal
If it is #mi in FIG. 4, the central controller 24
0 is an idle modulation / demodulation device that can call the called terminal device #mi.
Device, for example, FIG. Select and capture n modulator / demodulator 210
Capture (Fig. 7, 712). Subsequently, the central control unit 240 determines that the called terminal device is
Upstream and downstream priors assigned to device #mi
And the communication PN code are transmitted to the signal receiving and distributing device 23.
0 through No. 0. PN generator 2 of n modem 210
13 (FIG. 7, 713). Spread by this
The modulator 211 starts transmitting the preamble signal (FIG. 7,
714), the spreading demodulator 212 is from the #mi terminal device.
Prepare to receive the preamble signal. Preamble signal
Is transmitted through the transceiver 220, the antenna 500,
In the #mi terminal device 100, the antenna 130 shown in FIG.
And transmitted to the spread demodulator through the transceiver 120.
You. As described for outgoing calls, the terminal device is empty
Then, the spread demodulator 112 is pre-
Since it operates with amble code, the preamble signal is
When it is input, the synchronization capture is controlled by the synchronization circuit 114.
(FIG. 7, 701). When the downlink preamble signal is synchronously captured,
Immediately under the control of the control device 140, the upstream preamble
From the spread modulator 111 to the transmitter / receiver 120,
(FIG. 7, 702). This up
The preamble signal is transmitted from the antenna 500 of FIG.
It is input to the spread demodulator 212 through 220. No. Spread demodulator 2 of n modulator / demodulator 210
12, the pre-processing from the #mi terminal device has already been performed as described above.
Since it is set to receive the amble signal,
The acquired preamble signal is immediately synchronously captured (FIG. 7,
715). Upon completion of synchronization acquisition, the spread modulator 211
Synchronizes with the #mi terminal device 100,
The umble code is switched to the PN code for communication (Fig. 7, 71).
6). In response to this, a spread demodulator
The code of 112 is changed from the preamble code to the PN code for communication.
(703 in FIG. 7), followed by the spread modulator 111
From the preamble code to the PN code for communication
(704 in FIG. 7). On the exchange side, No. Expansion of n modulator / demodulator
The spread code of the spread demodulator 212 is synchronized with the terminal device side.
Switch from preamble code to PN code for communication
(FIG. 7, 717), No. n modem # 210 and #mi
Setting of both uplink and downlink radio channels between the terminal devices 100
Is completed. As described above, the preamble signal
Synchronized acquisition and switching to communication PN code
Since it is performed by the equation, the sign switching shown in FIGS.
Therefore, the central control unit 240 establishes both downlink and uplink channels.
You can confirm that the setting has been completed. After that, the central control unit 240 is replaced by a normal exchange device.
The caller sends a ringing tone and the called party
Is controlled so as to send a calling signal (see FIG. 7, 71).
8). It should be noted that the central control unit 2 is used when transmitting the calling signal.
FIG. 40 shows an instruction for controlling the calling signal transmission by the control of 40.
5 is transmitted to the terminal device on the D channel in
In the device 100, the control device 140 receives this and links it.
Drives moth-166. As described above, at the time of making or receiving a call
In addition, the idle modulator / demodulator 210 is used to communicate with the terminal device 100.
Between the switching devices 200 by means of spread spectrum communication
By setting the channel, the number of simultaneous calls / communication
n wireless communication system can be realized. With this method
Means that the number of simultaneous calls / communications is n
Within that, it becomes relatively independent of the number of terminal devices, so
Economical in application areas with low call volumes per terminal
is there. In the above embodiment, the terminal device shown in FIG.
The units # m1 and #mi connect the child exchange device 200 on the floor.
In the above description, the main exchange 3
For example, the # 1 and #l terminal devices make a call / communication via 00.
The same is true for the case of # m1 terminal device and #nj terminal.
End device talks / passes through #m and #n child switching devices
Communication, the exchange operation of the exchange
Radio channel between the terminal equipment and the modem in the switching equipment.
Parts related to the present invention, such as channel setting, call detection, and calling
The same is true for minutes. Therefore, the exchange method is a decentralized system.
Control, centralized control, or configuration of time-division call paths
The present invention can be applied without being affected by the above. Method of transmitting signal between switching device and terminal device
Is also limited to the format of FIG. 5A in the embodiment.
Instead, B + B + D shown in FIG. 5B may be used.
There is no problem even if the method is different. Further examples
Call on the dial 165 for telephone calls
Then, the speaker calls the Tonlinger 166 to transmit and receive.
I explained the case of talking on the device 163,164,
After the call path is set, the spread modulator / demodulator 11 in the terminal device 100
1, 112 and the connection of the PCM modulator / demodulators 161, 162,
Switching to data terminal device 170 to perform data communication.
It is possible to use a data terminal instead of the dial 165.
Enter the destination number / code using the keyboard in device 170
Needless to say, it is possible to make a connection by force
There is no. In this embodiment, one time slot is targeted for telephones.
8 bit, 8000 frames / sec.
As mentioned above, the digital radio channel is
Since the channel is set to 1 channel, the switching device
Even if it is a switching device, there is no problem even if it sends image signals.
There is no. 2. b Second Embodiment A second embodiment is a system in which a switching device is used as shown in FIG.
Spread synchronization signal generation circuit 2 for synchronizing signal by ram spread signal
80 to transmit spectrum to the switching equipment and terminal equipment.
Operate synchronously with each other over distributed communication channels
In this way, the spread spectrum modulation and demodulation
The apparatus 210 enables time division multiplexing. The switching devices 200 and 300 have a first
Similar to the example, it is composed of 8000 frames per second,
Eway 260-1 to 260-r and 261-1 to 26-2
On 61-r, one frame consists of n time slots.
Shall consist of These frames, time slots, etc.
Is the synchronization supplied from the synchronization signal generation circuit 270 of FIG.
The signals are synchronized. Each terminal device 100 has a separate spectrum
PN code for ram spreading, PNU (for upstream) and PND
(For going down) is given. Terminal device J (not shown in FIG. 4)
The PN code for (abbreviated) is represented as PNUj and PNDj.
You In the present embodiment, furthermore, all operating with the same synchronization signal
Synchronous signal receiving PN code PNC common to terminal devices
Provided. This PNC also plays the role of a preamble code.
Add A switching device, eg 200, is put into operation.
And the spread synchronizing signal generation circuit 280 of FIG.
In response to the synchronization signal from the circuit 270, the terminal device synchronization signal
The spectrum is spread by the spread code PNC, and the transmitter / receiver 22
0, transmit through antenna 500. Spread transmitted
FIG. 8 shows the synchronization signal. FIG. 8 (a) shows the extension transmitted from the exchange.
The sync signal is shown on the time axis, below the horizontal axis in the figure.
The PNC of FIG. 2 has expanded signals SNC1 to SNCn on the upper side of the horizontal axis.
Indicates that spread modulation is performed with the scatter code PNC. Synchronization
Nos. SNC1 to SNCn correspond to time slots.
By receiving this, the receiving side can
Unit numbers can be identified. That is, it also becomes a frame synchronization signal.
ing. Here, this synchronization signal is a preamble signal.
Since it also doubles as a function, in order to shorten the time until synchronization acquisition
The spread code PNC is a simple code and
Code is required to be repeated.
The length of NC is the time slot length or its integer
It is preferably one. 2. b. 1 Terminal device start-up operation On the terminal device side, power is turned on and the synchronization signal
Of the switching device 200/300
Waiting for a call or making an outgoing call in synchronization with
This state is set by the flow chart of FIGS. 3, 8 and 9.
explain. In FIG. 8, the terminal device J is turned on by
Since it is performed independently of the operation of the exchange,
Out of date. When the terminal device J is turned on (see FIG. 8).
(B)), the control device 140 of FIG.
The operation is started under the control of 140 (FIG. 9, 90).
1). First, the PN generator 113 is used for receiving the spread sync signal.
PN code PNC is generated (902 in FIG. 9), and spread demodulator
112 starts the demodulation operation with the PN code PNC (Fig.
9, 903). On the other hand, the synchronization circuit 114 includes the PN generator 1
13 to start the synchronization acquisition operation (FIG. 9, 91).
1). When the power is turned on, as shown in FIG.
The PN code of the spread demodulator 112 is not synchronized.
No output is obtained from the spread demodulator 112, but the synchronization circuit
When synchronization with the received signal is achieved under the control of 114, the spread demodulator
The output is obtained from 112 (904 in FIG. 9),
Completed (FIG. 9, 912), the synchronization circuit 114 starts the synchronization acquisition operation.
The work shifts to the synchronous tracking operation (913 in FIG. 9). By completing the synchronization acquisition, the reception synchronization
The switch's time slot number is derived from the signal
Thus, the clock and time in the terminal device 100 are
Synchronize synchronization signals such as slots and frames with the switching equipment
You. Thereafter, as shown in FIG.
The synchronization error is corrected by the received synchronization signal. The controller 140 confirms that the synchronization acquisition is completed.
And controls the PN generator 113 to control the spread demodulator 11
The PN code to 2 is given to the own terminal device from the PNC.
To the PN code PNDj (905 in FIG. 9).
The modulator 112 starts the demodulation operation with the PN code and PNDj.
(FIG. 9, 906). At this time, the terminal device 100
What time slot does the 200/300 call in?
I do not know, so as shown in Figure 8 (b)
A demodulation operation is performed on the data by PNDj. In sync
Therefore, for example, as shown in FIG.
The PN generator 113 is controlled every time the spread demodulator 11
The synchronization signal is received by changing the PN code of No. 2 to PNC. The controller 140 outputs the output of the spread demodulator 112.
The next time slot if no signal is detected.
Signal continues to be detected (Fig. 9, 907)
If there is an incoming call using the timeslot,
That is, the operation of the spread demodulator 112 is performed
It is fixed to the slot, and other times are set to prevent malfunction.
The demodulation operation in the slot is stopped (908 in FIG. 9). Na
For receiving the synchronization signal, for example, in order to simplify the control,
As described above, the time slot immediately before the time slot
Fixed to Of the above operations, the judgment of 907 in FIG.
If the terminal device is idle,
Operation. [0062] 2. b. 2 Calling operation Next, the operation when the terminal device makes a call is shown in FIGS.
And the time relationship diagram of FIG. 10 and the flowchart of FIG.
I will explain using. When the caller lifts the handset of the terminal device J,
Control of FIG. 3 that the hook switch (not shown) is closed
The device 140 detects (FIG. 11, 1101) and the interface
From the PN generator 113 via the source circuit 150
A code (PNUj) is generated and is generated by the spread modulator 111.
Call signal using all the time slots with the PN code.
Spread and modulate the signal through the transceiver 120 and antenna 130.
And transmits (FIG. 11, 1102). Where the spread modulation
The signal to be transmitted is, for example, B + D or as shown in FIG.
Is a signal having a configuration such as B + B + D. Here, B + D
Explanation is given assuming the format. That is, on the horizontal axis of FIG.
TS1, TS2, etc. in the section represent time slot numbers,
The hatched area is the D signal, and the unhatched area is the B signal.
Represents the issue. 10 (a), (b), (e), (f)
By the way, each frame does not start from TS1,
This is because it is based on the highway of the exchange device. The calling signal is a signal of a specific pattern or
Shall send the caller and calling conditions (telephone, data, etc.)
And depends on the system. Also, in terms of time
Is an exchange device shown in FIGS. 8 (b) and 10 (f).
Based on the synchronization signal SNC sent from
Synchronize and send. In the exchange apparatus 200/300, FIG.
The central control unit 240 of each modulator / demodulator 210 (same server
When multiple modulation / demodulation equipment is installed in the screw area
Free time, for at least one of them)
Uplink PN signals (P
NU)) to drive the sequential spreading demodulator 212 and all available terminals
The device is scanned for a call (see FIGS. 11 and 11).
11). Now, FIG. 10B will be described. Correspondence
If the modem 210 on the side of the switching device that operates is No. 1 device
Then, the central control unit 240 transmits the time slot of the frame q.
Call detection of terminal device m on To 1 (on highway)
Therefore, No. The terminal device is connected to the PN generator 213 of one device.
m upstream PN code PNUm is generated, and the spread demodulator 21
2 was activated, but no signal was obtained and no outgoing call was detected.
Indicates that the Continued time slot 2 (highway
The upper part) is already used for communication with the terminal device i. Time slot 3 of frame q (highway
B)), because the calling of terminal device J is detected,
With the same control as in the case of
The spread demodulator 212 is driven (FIGS. 11 and 1112). end
In the end device J, as shown in FIG.
Signal is spread-modulated with PN code PNUj and transmitted.
Then, the calling signal is demodulated by the spread demodulator 212 and controlled.
It is detected by the device 217. And the signal reception and distribution device 23
0 to the central control unit 240 (FIG. 11, 1).
113). The central controller 240 controls the spread demodulator 212
Since the calling signal is detected by the PN code PNUj, the terminal
It is identified that the device J makes a call (FIG. 11, 111
4). The central control unit 240 uses the dial tone connection (transmit
Sound, or connection to a pushbutton signal receiver)
The upstream (highway transmission) time slot and the downstream
(Receiving highway) Select a time slot. this
When the up time slot is the time used for
Slots or different time slots can be used (Fig. 1
1, 1115). Then select the down time slot you selected.
For example, TSn (time slot on highway
No. 1). 1 modulator / demodulator 210 spread modulator
Receive signal to operate 211 with PN code PNDj
When instructing the control device 217 via the distribution device 230,
In addition, the uplink time slot is, for example, TS2 (highway
Instruct the terminal device J to allocate the above time slot 3)
Show. The controller 217 controls the PN generator 213.
Then, the spread modulator 211 outputs the time slot TSn.
It operates with the PN code PNDj and the spread demodulator 212
Operates with PN code PNUj in slot TS2
(Fig. 11, 1116). Buffer memo at the same time
The upstream time slot number TS2 via
A signal is input to the spread modulator 211 and transmitted to the terminal device J.
(Fig. 10 (e), Fig. 11, 1117). At this point, the modulator / demodulator 210 and
There is no need to connect the e-ways 260- / 261-. Ma
In addition, the uplink time slot uses the time
In a system that changes from lot to lot,
After sending the slot number to the terminal device,
While synchronizing with the controller 111, the time
It is preferable to switch lots. 2 synchronous times
Path 214 provides synchronization tracking for spreading demodulator 212. In the terminal device J, as shown in FIG.
As shown in FIG. 10F, the spread demodulator 112 (FIG. 3)
Operate with PN code PNDj in all time slots
Time slot TSn.
Lot number TS2 is received (Fig. 11, 1103) and exchanged
Originating call detection has been performed in the device 200/300.
Is confirmed, the control device 140 controls the PN generator 113.
The operation of the spread modulator 111 is fixed to TS2.
Furthermore, the operation of the spread demodulator 112 is fixed to TSn (see FIG. 1).
0 (a), (f), FIGS. 11, 1104). Reception of synchronization signal in terminal device 100
No matter which time slot the call arrives at,
N + 1 time slot for signal detection with frame delay
It is assumed that the data will be received for each eye (Fig. 8 (b)), but for communication
After the time slot is fixed, the
Imslot is also fixed. This is an n + 1 time slot
Communication is performed once every n frames if the synchronization signal is continuously received for each eye.
For receiving the synchronization signal in the time slot for
In the example of FIG. 10, the communication time slot immediately before the communication time slot is used.
A synchronization signal is being received in the time slot. On the side of the switching device, the terminal device 100
After sending the time slot number, (from the terminal device 100)
A signal confirming that the upstream timeslot number has been received
May be sent, and after receiving this), for example, press
Select and capture a button signal receiver (not shown) and call
With the time slot on the highway that is selected for
Set up the channel between
The imslot number indicates the buffer memory of FIG.
And 216 are operated. 1 modem and 210
Iway 260-1 and 261-1 are connected (FIG. 1
1, 1118). A push button signal receiver outputs a dial tone and
If you dial with the end device, the multi-frequency signal corresponding to the dial
No. is sent to the push button signal receiver. The multi-frequency signal in the terminal device 100 is
Although detailed description of the signal sending operation is omitted, the control device 140
PCM coded, which corresponds to the dial signal received by
Sequentially inputting the multi-frequency signal to the spread modulator 111.
Done by With the above operation, the terminal device 100 and the exchange device
Since the wireless channel between 200/300 has been set,
The subsequent operation of the switching devices 200/300 is the same as that of the known one.
Is performed. In the above description, for example, FIG.
Send uplink time slot number from switching equipment to terminal equipment
In this case, it is written to send within one frame, but D channel
Even if you send it over multiple frames using
It is clear that there is no obstacle, and it is not limited to the figure
There is no. Although the description is omitted, the addition of the D channel, etc. is performed by referring to FIG.
And the buffer memory 2 in the same manner as in the first embodiment.
15, 216. 2. b. 3 Incoming call operation Time relationship diagram of FIG. 2, FIG. 3 and FIG. 12 and of FIG.
The operation for an incoming call will be described with reference to a flowchart. In FIG. 2, the central controller 240 calls the called party.
As soon as the number is received (Fig. 13, 1311), the called number
Identifies that the called terminal is, for example, "J" from the
(FIGS. 13 and 1312). Then, the central controller 240
Is a modulation / demodulation device 2 capable of calling the called terminal device J.
Select 10. Modulator / demodulator 2 capable of calling the terminal device J
When 10 is only one, it is uniquely determined, but there are multiple
Empty channel between the calling terminal or incoming line
A modulation / demodulation device having the following is selected (FIGS. 13 and 1313). In parallel with this, the calling terminal device or the
The modulation / demodulation device 210 selected as the line, for example, n device
Both highways for sending and receiving empty time slots between
Select on 260-r, 261-r. This embodiment
Now, the highway time slots and radio channel
No. No. n modulation / demodulation equipment
Both up and down times between the device 210 and the called terminal J
This means that the slot has been selected (FIGS. 13 and 1314).
Here, TSn is the upstream time slot, and the downstream time is
It is assumed that TS2 is selected as the slot (FIG. 12). As described above, the modulator / demodulator 210 and the terminal device are
No. 100, the upstream and downstream time slots are No.
n, No. J, TSn, TS2 decided, so central system
The control device 240 receives N signals via the signal receiving / distributing device 230.
o. Gives an instruction to the control device 217 of the n modulator / demodulator 210.
The spread modulator 211 is controlled by the control of the controller 217.
In the time slot TS2, the spread modulation is performed with the PN code PNDj.
Keying operation (Figs. 13 and 1315) and spread demodulation
The device 212 uses the PN code PN in the time slot TSn.
To perform the spread demodulation operation at Uj (FIG. 13, 1316)
Set. Further, the control device 217 determines that the time slot
An incoming signal is input to the downlink buffer memory 215 in TS2.
Required information and upstream time slot number to be used
No. TSn is input, and the spread modulator 211 expands it with PNDj.
Spread modulated and transmitted through the transceiver 220 and the antenna 500
(FIG. 12 (b), FIG. 13, 1317). No. In the J terminal device 100,
The tena 130 receives this signal and the transceiver 120 amplifies it.
Then, it is input to the spread modulator 112. No. J terminal device 1
00, as shown in FIG.
12 is a PN code PNDj in all time slots,
Since the spread demodulation operation is performed,
The input signal is immediately demodulated, and the incoming signal
The slot number TSn is detected as a signal (FIG. 12).
(C), FIG. 13, 1301). In the terminal device 100, the control device 140 is installed.
This is received through the interface circuit 150 and the incoming call processing is performed.
While controlling the PN generator 113 to perform spread demodulation.
The operation of the instrument 112 is fixed to the time slot TS2,
On the other hand, fix the reception of the sync signal to the previous time slot.
You. That is, PN code PNC at the position of time slot TS1
The demodulation operation is performed by and the synchronization signal SNC2 is received (see FIG. 1).
2 (c), FIGS. 13, 1303). Similarly, the spread modulator 111 also receives a signal.
P to operate in the received time slot TSn
Control the N generator 113 (FIG. 12 (d), FIG. 13, 1)
302). The control device 140 receives the call from the spread modulator 111.
Input a confirmation signal to confirm that the signal has been
Switching device 200 /
It is sent to 300 (FIG. 13, 1304). By the above operation, the switching device 200/3
The channel between 00 and the terminal device 100 has been set.
And the control device 140 passes through the interface circuit 150
Then, ringer 166 is sounded and a calling signal is transmitted.
(FIG. 13, 1305). On the other hand, on the exchange side, the No. n change
The spread demodulator 212 of the demodulator 210 uses a time slot
Since it operates with PN code PNUj in TSn,
The confirmation signal sent from the terminal device 100 is immediately restored.
Adjusted (FIGS. 13 and 1318) and signaled from controller 217.
The data is transferred to the central control unit 240 via the reception distribution unit 230.
Be done. The central control unit 240 is a channel with the terminal device.
Now that we have confirmed the settings, we can perform incoming connection processing such as sending ringing tone.
Perform (FIG. 13, 1319). As described above, according to the present invention, the exchange device-
It becomes possible to make wireless between the terminal devices. Incidentally, refer to the states of (b) and (e) of FIG.
First, (b) shows the time slot T
Sn is terminal device K, time slot TS1 is terminal device
It is used for I and time slot TS2 is frame q
Indicates that the terminal device J has started to be used. FIG. 12E shows the time slot of the frame q.
The terminal device M of the terminal TSn (TS1 on the highway)
Call detection was performed, but the call was not detected.
And time slot T from frame q + 1
Sn indicates that the terminal device J has been used. Follow
For subsequent call detection, use another empty time slot.
Will be done. Also, the time slot TS1 is
The terminal device K uses the time slot TS2 for the terminal device I.
Is used. The second embodiment will be briefly described above.
However, after the wireless line has been set up, the time
Same as digital switching system with slot memory
It is clear that the same operation is performed, and known communication systems
All the functions of can be introduced. In the present embodiment, the highway of the exchange is used.
As it is, it is extended to the wireless channel between the switching device and the terminal device.
Was described, the buffer memory 215 of FIG.
216 has a time switch function, that is, a time slot
With the function of replacement, the time on the wireless channel
Lot allocation is completely independent of the exchange highway
And the number of time slots, ie transmission
The speed can also be independent. For example,
The time slots of the flannel are rigged to each terminal device.
The highway from the buffer memories 215 and 216
A configuration such as concentrating at the point where the connection is made becomes possible. In the second embodiment, as shown in FIG.
Both the main exchange and the child exchange have exchange functions.
In other words, the connection between the terminal devices accommodated in the same child exchange device
The following is a case where processing is performed in the child exchange device.
The buffer memories 215 and 216 have time switch
Highway 260-1 to 260-r, 2
61-1 to 261-r are cables 600 (for example, optical fiber
High-speed digital highway by Iva)
Instead, the central control unit 240 provided in the main switching unit
Communication with the control device 217 in the modem 210 is high.
Some of the time slots on the way are used as signaling channels
If used, the child switching device of FIG.
The position 210 itself will improve. At this time, the same
All communication between terminal devices in the modulator / demodulator is also a node device
610, via cable 600, via main switching device 300
Will be held in. In other words, the modem 21
Configure a switching system using 0 as a remote concentrator
It is also possible. The above embodiment is based on the voice of 64 kb / s.
I explained ISDN as a standard.
If the slot is made larger, the message slot method
It can also be used for packet communication. Further, the exchange system of the present invention is a terminal device.
The access channel from the
It has a star-shaped wiring for the function
And therefore contention control switching equipment
In other words, if the terminal device sends a calling signal,
Start communication by receiving the communication start permission signal from the
For example, if you send packets, the star-shaped local area
The same function as the network (LAN) can be realized. One of the characteristics of spread spectrum modulation
If noise immunity is used, the amount of attenuation is high in the high frequency range.
Wired transmission using existing local cable for voice communication
It is also possible, as a subscriber line transmission system in ISDN
Can be utilized. Time division multiplexing as shown in the second embodiment.
In the case of spread spectrum modulation of the converted signal,
As a transmission line between the terminal equipment and the switching equipment, the twisted pair
Oh, or use a wired transmission line such as a coaxial cable,
Also connect multiple terminal devices on the same cable.
If the connection type or multi-drop type
Multiple terminals can be connected with a single cable without using magnetic waves.
It also makes it possible to provide communication between the switching and switching devices. This method is used along the railway, along the road, or
Communicates using the cable installed along the power line
In such a case, a single cable can
It is very economical because it can provide the communication path of. According to the present invention, the communication path is time-division multiple access.
While continuing to increase the efficiency of channel usage, confidentiality,
It has high noise resistance and adopts a digital exchange system.
Providing a wireless base station with good compatibility with existing telephone switching systems
Can be offered. This also allows you to
No wiring is required even when rearranging or moving the terminal device.
Since no construction is required, the telephone exchange system is extremely flexible.
You can build a stem. Especially when applied to offices
In some cases, weak radio waves can be used, so problems with radio wave management
Moreover, it has the effect of making the system wireless.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system configuration diagram of an exchange device showing a first embodiment of the present invention. FIG. 2 is a system configuration diagram of an exchange device side showing a second embodiment of the present invention. FIG. 3 is a system configuration diagram showing an embodiment of the terminal device side according to the present invention. FIG. 4 is a configuration diagram of a distributed switching system showing an example of a switching system according to the present invention. FIG. 5 is a time relationship diagram showing a relationship between a signal on a highway and a signal on a wireless transmission path to a terminal device according to the first embodiment of the present invention. FIG. 6 is a flowchart showing a calling operation according to the first embodiment of this invention. FIG. 7 is a flowchart showing an incoming call operation according to the first embodiment of this invention. FIG. 8 is a time relation diagram showing a state of a synchronization signal and a signal of a demodulation operation from a power-on of a terminal device to a standby for synchronization acquisition reception according to the second embodiment of the present invention. FIG. 9 is a flowchart showing an operation from power-on to standby for incoming call of the terminal device according to the second embodiment of the present invention. FIG. 10 is a time relation diagram showing a relation of signals during a calling operation according to the second embodiment of the present invention. FIG. 11 is a flowchart showing a calling operation according to the second embodiment of the present invention. FIG. 12 is a time relationship diagram showing a signal relationship at the time of an incoming call operation according to the second embodiment of the present invention. FIG. 13 is a flowchart showing an incoming call operation according to the second embodiment of the present invention. [Description of Codes] 100 ... Terminal Device, 111 ... Spread Modulator, 112
... Spread demodulator, 113 ... PN generator, 114 ... Synchronous circuit, 120 ... Transceiver, 130 ... Antenna, 1
40 ... Control device, 150 ... Interface circuit,
161 ... PCM modulator, 162 ... PCM demodulator, 163 ... Transmitter, 164 ... Receiver, 165 ...
Dial, 166 ... Ringer, 170 ... Data terminal device, 200 ... Switching device, 210 ... Modulation / demodulation device,
211 ... Spreading modulator, 212 ... Spreading demodulator, 213 ...
PN generator, 214 ... Synchronous circuit, 215, 216 ... Buffer memory, 217 ... Control device, 220
... Transceiver, 230 ... Signal receiving and distributing device, 240 ...
Central control device, 250 ... Switching network, 3
00 ... Exchanger, 400 ... External cable, 500 ...
Antenna, 600 ... Cable, 610 ... Node device.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04Q 11/04 H04Q 11/04 Z

Claims (1)

[Claims] 1. In a radio base station that connects a terminal device to a telephone network via a wireless line, control means for controlling connection with the terminal device, and spread spectrum modulation for spread spectrum modulation based on a spreading code selected by the control means. Means, time-division multiplex means for time-division-multiplexing the signal modulated by the spread-spectrum modulation means, and arranging it in a time slot; and transmitting means for transmitting the signal arranged by the time-division multiplexing. A wireless base station characterized by. 2. In the wireless base station according to claim 1,
A radio base station, wherein when acquiring synchronization with the terminal device, a signal for acquiring synchronization is transmitted using more time slots than the time slots used for communication.