JPS6322746B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a time-division multiplexing wireless communication system, and in particular, in any slave station, a channel that spans carrier terminal equipment of two or more corresponding master stations is used. The present invention relates to a channel selection method for a wireless communication system in which a wireless communication system is installed.

(2) Prior art and its problems As an example of such a wireless communication system, FIG. 1 shows the station configuration of a general multidirectional multiplex wireless communication system. The channel arrangement of the master station M, indicated by a double circle in the figure, is determined so that it can transmit and receive data to and from each of the slave stations A to C, indicated by single circles.

FIG. 2 shows an example of channel arrangement and equipment configuration in the wireless communication system shown in FIG. 1.

Here, assuming that the carrier terminal equipment used has a maximum multiplexing capability of 10 channels, the carrier terminal set channels (hereinafter abbreviated as CH) 1 to 10 to the master station M, as shown in the figure. Station equipment 1 and
A modulator 5 is provided which collectively modulates two series of signals from the carrier terminal equipment 1' set to CH11 to 20 and from both carrier terminal equipments and transmits the modulated signals via a radio line.

The slave station A includes a demodulator 6A that demodulates the received signal from the master station M via the wireless line, and a carrier terminal device 10A that inputs the signal of series a corresponding to the carrier terminal device 1 from the demodulator 6A. It is provided. In this case, the signals of series b are not used.

The slave station C includes a demodulator 6C that demodulates the received signal from the master station M via the wireless line, and a carrier terminal device 10C that inputs the signal of series b corresponding to the carrier terminal device 1' from the demodulator 6C. is provided. In this case, the signals of series a are not used.

Furthermore, the slave station B includes a demodulator 6B that demodulates the received signal from the master station M via the wireless line, and a demodulator 6B.
A carrier terminal station device 10B inputs a signal of series a corresponding to the carrier terminal device 1 from the carrier terminal device 1, and a carrier terminal station device 1 inputs a signal of series b corresponding to the carrier terminal device 1'.
0B' is provided.

Generally, the number of channels that can be processed by one carrier terminal equipment is determined according to the capacity of each carrier terminal equipment, and increasing the number unnecessarily will increase the cost of the system. Undesirable. Therefore, as shown in FIG.
In this case, two carrier terminal equipment with a capacity of 10 channels are installed, and only one terminal equipment with a capacity of 20 channels is installed.

In this conventional channel arrangement method, CH1~
10, or channels within the range of CH11 to 20, each of the carrier terminal equipment of the slave station needs to process one series of signals, so one unit is 10A, 10C.
However, for example, as shown in slave station B, it is possible to configure multiple carrier terminal stations across multiple carrier terminal devices and to which channels are assigned.
Since it is necessary to process two series of signals a and b including CH8 to CH10 and CH11 to CH15, two carrier terminal devices 10B and 10 corresponding to each series are required.
It is necessary to provide B′. It is necessary to

However, in slave station B, the total channel capacity is 8.
This is less than the maximum capacity (10 channels) of channels and one carrier end station device, and it cannot be said that the device is configured effectively.

(3) Purpose of the Invention The present invention has been made in view of the problems of the prior art described above, and its purpose is to operate the system efficiently.

(4) Structure of the Invention The present invention focuses on the fact that the frame formats of a plurality of carrier terminal devices installed in a master station are the same. In a multi-directional multiplex wireless communication system configured to include a plurality of terminal stations, the master station includes a modulator that collectively modulates multiple series of signals including frame synchronization pulses from the plurality of terminal stations and transmits the modulators via a wireless line. have,
At least one of the slave stations includes a demodulator that demodulates the received signal via the wireless line and outputs the plurality of series of signals, and a demodulator that outputs the plurality of series of signals by demodulating the frame synchronization pulse in the demodulated plurality of series of signals. a frame synchronization circuit that outputs a synchronization timing pulse based on the synchronization timing pulse; a channel setting circuit that outputs a switching signal based on the synchronization timing pulse; and a channel setting circuit that outputs a switching signal based on the switching signal; and selecting one series of signals from the demodulated multiple series of signals based on the switching signal. and a switching circuit for transmitting the signals to the one carrier terminal station, and at least one of the plurality of carrier terminal stations of the master station and the modulator or between the frame synchronization circuit and the switching circuit of the slave station. , a delay difference detection circuit that detects a delay difference between the plurality of signal sequences based on the position of the frame synchronization pulse of the plurality of signal sequences, and a delay difference detection circuit that detects the position of the frame synchronization pulse between the plurality of signal sequences based on the delay difference A matching delay circuit is provided to achieve the above object of the invention.

(5) Embodiment of the Invention An embodiment of the channel arrangement method according to the present invention is shown in FIG. Here, the master station M includes a carrier terminal device configured for CH1 to CH10 in the same way as shown in FIG.
A carrier terminal station device (only channel settings are shown) is provided. In addition, slave stations A and C
Then, as shown in Figure 2, each CH1
7 and CH16 to 20 (only channel settings are shown) is provided.

However, in the present invention, in slave station B, CH11
~15 and CH8~10 are set in one carrier terminal station, and its configuration is extremely simple.

Hereinafter, with reference to FIG. 4, an embodiment of a transmitting/receiving system that enables channel arrangement according to the present invention will be described.

In FIG. 4, the upper part shows a master station having a plurality of carrier terminal apparatuses, and the lower part shows a slave station to which a channel spanning a plurality of carrier terminal apparatuses is assigned in the corresponding master station. The broken line connecting the two represents a wireless line. For the sake of explanation, here,
The channel configuration is the same as that shown in FIG.

Time-divided signals in a predetermined format are sent from the two carrier terminal devices 1, 1' to CH1-10 and CH11-20 shown in FIGS. 5a and 5b, respectively.
Each signal series consists of multiple frames with frame synchronization pulses F1 to Fn at the beginning, and since these signal series are usually independent, the positions of the frame synchronization pulses between each signal series do not match. It doesn't necessarily mean there are.

The frame synchronization circuit 2 generates timing pulses (C1 and C2 in FIG. 5) that match the frame synchronization pulse F1 of each signal, and the delay difference detection circuit 4 generates timing pulses of both signal sequences calculated from these timing pulses. A delay difference pulse (C3 in FIG. 5) indicating the time difference is transferred to the delay circuit 3.

The delay circuit 3 delays the signal from the carrier terminal device 1' according to the delay difference pulse C3, and adjusts the position of the frame synchronization pulse in the signal from the carrier terminal device 1 and the signal from the carrier terminal device 1'. Match the position of the frame sync pulse. [Figure 5 b'].
Thereafter, both signals whose frame synchronization pulses have matched positions are transferred to a modulator 5 that uses a modulation method that modulates two series of signals together, such as 4-phase PSK, and is sent to a slave station via a wireless line. be done.

On the other hand, in the slave station, a demodulator 6 demodulates the received signal, and a frame synchronization circuit 7 synchronizes the frames. In the switching circuit 8, according to the synchronization timing pulse f from the frame synchronization circuit 7, the switching signal from the channel setting circuit 9 (FIG. 5d) switches CH6 to CH10 from the first signal sequence a to the second signal sequence. b
Select CH11 to CH15 from , respectively, and switch.

The two series of signals received by the switching circuit 8 select predetermined channels, respectively, and are sent to the carrier terminal equipment 10 as one series of signals shown in FIG. 5e.

In the above embodiment, a method was described in which the master station matches the positions of frame synchronization pulses between signals from each carrier terminal device, but the application of the present invention is not limited to this. Since channel selection and switching are performed only in a predetermined slave station, it is also possible to delay one of the signal sequences and match the position of the frame synchronization pulse in the front stage of the switching circuit of the slave station. be.

Further, the number of carrier terminal devices, the number of channels, etc. in the master station and slave stations can be changed as appropriate and necessary.

(6) Effects of the Invention As described above, according to the present invention, even when channels are arranged across multiple carrier terminal devices in the corresponding master station, the number of outputs at the slave station can be reduced. It is no longer necessary to match the input at the master station, and the number of carrier terminal devices can be reduced. Therefore, it is possible to operate the system efficiently,
This is effective in reducing the cost of equipment.

[Brief explanation of the drawing]

FIG. 1 shows the station configuration of the wireless system according to the present invention, FIG. 2 shows the conventional channel arrangement in the wireless system shown in FIG. 1, FIG. 3 shows the channel arrangement according to the present invention, and FIG. The figure shows an embodiment of the transmitting/receiving station according to the present invention, and FIG. 5 shows a time chart of signals in the embodiment shown in FIG. In the figure, 1 and 1' are carrier terminal equipment of the master station, 2 is a frame synchronization circuit, 3 is a delay circuit, 4 is a delay difference detection circuit, 5 is a modulator, 6 is a demodulator, 7 is a frame synchronization circuit, 8 is a switching circuit, 9 is a channel setting circuit,
Reference numeral 10 indicates a carrier terminal device of a slave station.

Claims (1)

[Scope of Claims] 1. In a multi-directional multiplex wireless communication system including a master station having a plurality of carrier terminal devices and a plurality of slave stations, the master station receives frame synchronization from the plurality of terminal stations. It has a modulator that collectively modulates a plurality of sequences of signals including pulses and sends them out via a wireless line, and at least one of the plurality of slave stations demodulates the received signal via the wireless line. a demodulator that outputs the plurality of series of signals; a frame synchronization circuit that outputs a synchronization timing pulse based on the frame synchronization pulse in the demodulated plurality of series signals; and a frame synchronization circuit that outputs a switching signal based on the synchronization timing pulse. a channel setting circuit; and a switching circuit that selects one series of signals from the plurality of demodulated signals based on the switching signal and sends it to the one carrier terminal station; between the carrier terminal station and the modulator or between the frame synchronization circuit and the switching circuit of the slave station, detecting the delay difference between the signals of the plurality of series based on the frame synchronization pulse of the signals of the plurality of series. A time division multiplexing wireless communication system, comprising: a delay difference detection circuit for detecting a delay difference; and a delay circuit for matching positions of frame synchronization pulses of the plurality of signals based on the delay difference.