JPS63272138A - Time division multiplex multiple access communication system - Google Patents

Abstract

PURPOSE:To attain the satisfactory call even at the time of a very bad cable transmission line by generating a time slot for control through a time division multiplex multiple access TDMA base station with a control station, belonging to respective TDMA base stations with the time slot for the control and standing by a TDMA terminal station in the idle condition. CONSTITUTION:A TDMA system is composed of plural TDMA base stations 21-2n provided corresponding to respective carriers, plural TDMA terminal stations 511-5ni belonging to these respectively connected with a carrier as a medium and a control station 1 to control the TDMA base stations 21-2n and the TDMA terminal stations 511-5ni. The control station 1 generates the time slot for the control through the TDMA base stations 21-2n, stands by the TDMA terminal stations 511-5ni which belong to respective TDMA base stations 21-2n and in an idle condition by the time slot for the control, and when an outgoing call or an incoming call occurs, commands the carrier and time slot to be used to the TDMA terminal stations 511-5ni to generate the outgoing call or the incoming call through the time slot for the control and executes the call connection. Thus, an equalizer is eliminated and a satisfactory call can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time division multiple access (TDMA) communication system, and particularly to a communication system using carrier waves.

[Prior Art] Conventionally, this type of time division multiple access communication system has a control station,
It consists of a TDMA base station and a large number of TDMA terminal stations. The following method has been proposed as a countermeasure against an increase in the number of TDMA terminal stations in this system.

That is, the first method is to maintain the signal transmission rate by carrier wave between the TDMA base station and the TDMA terminal station so as to accommodate the maximum number of TDMA terminal stations that can be expected in the future.

The second method is a method in which when the number of terminal stations increases exceeds a certain value, another system is added to cope with the increase.

[Problems to be Solved by the Invention] However, in the first method, the digital There is a problem that the rate of signal deterioration increases depending on the transmission speed, and in extreme cases, it may become impossible to transmit the signal. In order to avoid this, it is necessary to take measures such as compensating the transmission characteristics of the transmission path. However, in cases where the transmission characteristics up to the TDMA terminal station are different, it becomes necessary to adapt or adapt methods corresponding to the respective characteristics, resulting in a problem that increases the cost of the entire system.

In addition, in the second method, since all TDMA terminal stations cannot access other TDMA base stations in principle, the number of TDMA terminal stations that can be accommodated is greater than that in the first method, which has the same number of call time slots. The problem arises that the number of

SUMMARY OF THE INVENTION An object of the present invention is to provide a time division multiplex multiple access communication system that can solve the above-mentioned conventional problems, eliminate the need for other methods, and increase the number of terminal stations that can be accommodated.

[Means for solving problems]

The time division multiple access communication system of the present invention uses a plurality of carrier waves, and a plurality of TDMAs provided corresponding to each carrier wave.
a base station, and a plurality of TDMA terminal stations that each belong to these TDMA base stations and are connected using the carrier wave as a medium;
A TDMA system is configured by the TDMA base station and a control station that controls the TDMA terminal station, and the control station issues a control time slot through the TDMA base station, and uses the control time slot to control each TDMA base station. A TDMA terminal station that belongs to an idle state and is in an idle state may be put on standby, and when a call is made or an incoming call occurs, the control time slot may be used for the TDMA terminal station where the outgoing or incoming call occurred. It is configured to connect a call by commanding carrier waves and time slots.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

The figure is a block diagram of one embodiment of the present invention. In the figure, 1 is a control station, which includes a large number of TDMA base stations 2
．． ．． 2□, . . . 2fi are connected.

In addition, a combiner/distributor 3 is connected to these TDMA base stations, and a large number of TDMA terminal stations (5
1st, 5th, 2nd, -5th), (5z+, 5-z.

...5□, ) ~ (5fi,, 5fi□, ...5
．． , □) are connected. Here, these TDMA terminal stations are connected to the TDMA base station 2 for each group enclosed in parentheses.
1.2□.

...2□, respectively, and are configured to belong to each TDMA base station. This TDMA terminal station has subscriber connection terminals (6
,,,6,□,...6. i), (6□,.

6□2. ...6□,)~(6-1,6,,z,...
6h, ), and correspondingly, the control station l is provided with an exchange connection terminal (7h, ) connected to an exchange not shown.
++.

71□,...7. i), (7□1.7°,...7□
L) ~(7,,.

71,...7fi,) are provided.

Said exchange connection end 711+ 712+...7 n
i and subscriber connection end 6 II, 6+z+...61
have a one-to-one correspondence. For example, switch connection end 7□
The signal from the subscriber connection terminal 611 is output to the subscriber connection terminal 6II, and conversely, the signal from the subscriber connection terminal 611 is output to the exchange connection terminal 7□.

The same applies to the other exchange connection terminals 71□, . . . 77□ and subscriber connection terminals 61□, . . . 6, l.

The TDMA base station 2. , 22. ...21. are configured to perform TDMA processing using a plurality of different carrier waves.

Further, the control station 1 transmits control time slots from the TDMA base station to all TDMA terminal stations J 11+ 512+ via the distribution combiner 3 and coaxial cable 4.
...Send to 51. All these TDMA terminal stations 5□,
5°,...5. , + by receiving the control signal of this control time slot, the TDMA base stations 21, 2
The carrier wave of the rDMA base station that may be used among □, .

Next, the second TDMA communication method in the above configuration will be explained.

Switch connection end Tab (a is 1-n
(or b indicates one of 1 to i)) passes through the control station 1 via the coaxial cable 4 using the carrier waves of the two TDMA base stations, and is sent to the TDMA terminal station 5.
Arrive at ゜. The signal is regenerated again at the TDMA terminal station 5 MB, outputted to the subscriber connection terminal 6 MB, and transmitted to a subscriber not shown.

Further, uplink signals from subscribers are transmitted to the exchange through the reverse route described above.

Here, the control time slot from control station 1 is TDM
From the A base station 2 to the distribution combiner 3. Via coaxial cable 4,
It always arrives at all TDMA terminal stations 5□1 5+z+ . . . 5, . All of these TDMA terminal stations receive a control signal for the control time slot, and based on this control signal, the carrier wave of the TDMA base station that may be used and the time slot node for communication transmitted on that carrier wave are selected. Operates when idle to receive indications of call time slots that may be used.

When a subscriber not shown in the figure attempts to make a call, the calling signal from the subscriber passes through the subscriber connection end 6 MB and is sent to the TDMA terminal station 5 MB.
Detected at b. Once detected. The TDMA terminal station 5□ uses the uplink control time slot to the TDMA base station 21 to request permission from the control station 1 for a carrier wave and a time slot that it may use. For this permission request,
The control station 1 transmits carrier waves and communication time slots that may be used to the TDMA base station 2. The TDMA terminal station 5° is instructed through the downlink control time slot. Upon receiving the instruction, the TDMA terminal station 5 ak changes the frequency of the carrier wave and connects the voice signal from the subscriber to a call time slot that may be used.

On the other hand, the control station 1 connects the communication time slot on the carrier wave of the designated TDMA base station to the exchange connection end 7o.

By the above-described operation, the subscriber connection end 6mb and the exchange connection end 7° are connected to form a communication path. Therefore, all subscriber connections have access to any call time slot on any carrier.

Connections for incoming calls can access any call time slot on any carrier.

〔Effect of the invention〕

As explained above, the present invention emits a control time slot through a plurality of TDMA base stations provided corresponding to a plurality of carrier waves, and uses this control time slot to
A TDMA terminal station that belongs to an MA base station and is in an idle state is put on standby, and when a call occurs or an incoming call occurs, the TDMA terminal station where the outgoing or incoming call occurs is sent through its control time slot.
Since call connection is performed by instructing the DMA terminal station which carrier waves and time slots may be used, TDMA
Compared to the case where one base station uses one carrier wave, the transmission speed of a TDMA base station can be increased by the number of base stations, and good communication can be achieved even in the case of poor cable transmission paths. It is possible to do this, and the vases of the transmission path can be omitted.

In addition, since all subscribers can use all call time slots on all carrier waves, the call volume that can be carried is large, and base stations can be gradually added in response to an increase in the number of subscribers. It is also possible to introduce a system that is highly practical, which also has the effect of building a highly practical system.

[Brief explanation of the drawing]

The figure is a block diagram of one embodiment of the present invention. 1...control station, 2I, 2□,...2. ,...T
DMA base station, 3... combiner/distributor, 4... coaxial cable, 51. . 5.2...5 ni...TDMA terminal station, 6z, 6
+z,...6°,...Subscriber connection end, L+, L□,
...7 ni...Exchange connection terminal.

Claims (1)

[Claims] (1) In a time division multiple access (TDMA) communication system, a plurality of carrier waves are used, and a plurality of TDMA base stations are provided corresponding to each carrier wave, and each TDMA base station belongs to each of these TDMA base stations and uses the carrier wave as a medium. Multiple T connected
A TDMA system is composed of a DMA terminal station, the TDMA base station, and a control station that controls the TDMA terminal station, and the control station issues a control time slot through the TDMA base station, and uses this control time slot to T
A TDMA terminal station that belongs to a DMA base station and is in an idle state is put on standby, and when a call is made or an incoming call occurs, the control time slot is used for the TDMA terminal station where the outgoing or incoming call occurs. A time division multiple access communication system characterized in that call connection is performed by commanding carrier waves and time slots that may be used.