JPS5913438A - Time division multiplex radio communication system - Google Patents

Abstract

PURPOSE:To improve the efficiency of the titled system, by synchronizing the frames of signals from plural terminal station devices in a master station and selecting respective signal sequences corresponding to local stations to which channels expanded to the plural terminal stations are assigned to transfer them to the terminal station devices. CONSTITUTION:Channels (CHs) are assigned to the master station M and local stations B as shown in the figure and each signal sequence from the terminal stations 1, 1' of the master station M consists of the frame F1-Fn. A frame synchronizing circuit 2 in the master station M generates a timing pulse coincident with the synchronous pulse F1 of each signal and a delay difference detecting circuit 4 outputs a delay difference pulse C3. A delay circuit 3 delays a signal from the terminal station 1' in accordance with a pulse C3 and synchronizes the frames between the signal from the local station 1' and a signal from the terminal station 1 to transmit the signal. A switching circuit 8 in the local station B selects and switch CH6-CH10, CH11-CH15 from both the signal sequences by a switching signal (d) from a CH setting circuit 9 in accordance with a pulse (f) from a synchronizing circuit 7. A prescribed CH is selected from the two sequence signals and one sequence signal is transferred to a terminal station 10.

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, it straddles carrier terminal equipment of two or more corresponding master stations. The present invention relates to a channel selection method for a wireless communication system in which channels are arranged.

(2) Prior art and its problems FIG. 1 shows a multidirectional multiplex wireless communication system as an example of such a wireless communication system.

The station configuration is shown below. Master station M is represented by a double circle in the figure.

In this example, the arrangement of channels is determined for each of the slave stations A to C indicated by a - heavy circle so that transmission and reception can be performed.

FIG. 2 shows an example of channel arrangement in the station configuration shown in FIG. 1. As is clear from the figure, the master station M has two carrier terminal devices: a carrier terminal device configured with channels (hereinafter abbreviated as CH) 1 to 10, and a carrier terminal device configured with CHI 1 to CH2O. CHI is set up for slave station A.
7, and the slave station C is provided with a carrier terminal device in which CH16 to CH20 are set, respectively.

Furthermore, the slave station B is provided with two carrier terminal devices: a carrier terminal device in which CH8 to CH10 are set, and a carrier terminal device in which CHII to CH15 are set.

The number of channels that can be processed by one carrier terminal equipment in one transport is determined according to the capacity of each carrier terminal equipment, and increasing the number unnecessarily will increase the cost of the system. undesirable because it improves Therefore, the second
As shown in the figure, the master station M is provided with two carrier terminal devices with a capacity of 10 channels, and is not provided with only one terminal device with a capacity of 120 channels.

In such a conventional channel arrangement scheme, CHI~10. Alternatively, each of the slave stations to which channels within the range of CHI 1 to 20 are assigned can be configured with only one carrier terminal apparatus, but for example, as shown in slave station B, multiple carrier terminal apparatuses may be configured. In addition, in the case where the channels are divided, it is necessary to provide two carrier terminal devices each having CH8 to CH10 and CHI to CH15.

However, in slave station B, the total capacity of channels is less than 8 channels and the maximum capacity (10 channels) of one carrier terminal device, so the device is effective (3) Purpose of the Invention The present invention It was created in view of technical problems, and its purpose is to make the system operate more efficiently.

(4) Structure of the Invention The present invention focuses on the fact that the frame number formats of a plurality of carrier terminal devices installed in a master station are the same, and synchronizes the frames of the signals sent from each carrier terminal device. , and a slave station that is assigned a channel spanning multiple carrier terminal devices selects and switches each of the signal sequences corresponding to the multiple carrier terminal devices, and the carrier terminal device installed in the slave station selects and switches each of the signal sequences corresponding to the multiple carrier terminal devices. The present invention is intended to be transferred to the above, and 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 has a C
Terminal equipment configured with HL~10 and CHII~2
A terminal equipment set up to 0 is provided. Further, slave stations A and C are provided with one terminal device in which CHI-7 and CH16-20 are installed, respectively, similar to that shown in FIG.

However, in the present invention, in slave station B, CH11 to CH15
and CH8 to IO are set in one carrier terminal station, making the configuration very simple.

Hereinafter, with reference to FIG. 4, an embodiment of the transmitting/receiving system that enables channel arrangement according to the present invention will be described. Station, and the lower part is multiple carrier terminal equipment in the corresponding master station! ! A slave station assigned a channel across IK is shown as a husband, and a broken line connecting the two represents a wireless line. Note that for the sake of explanation, the channel configuration is the same as that shown in FIG. 3.

From the two carrier end station devices 1.1', each of FIG. 5(a)
Time-divided signals in a predetermined format are sent to CHI-10 and CHII-20 shown in l(b).

Each signal sequence is composed of frames Fl-Fn, and these frames are usually not synchronized.

In the frame synchronization circuit 2, the timing pulses (Fig. 5 (Ci
) + (C2)), and in the delay difference detection circuit 4,
A delay difference pulse (FIG. 5 (C3)) indicating the time difference between both signal sequences calculated by these timing pulses is transferred to the delay circuit.

In the delay circuit 3, the signal from the carrier terminal device 1' is delayed in accordance with the delay difference pulse C3, and frame synchronization with the signal from the carrier terminal device 1 is established (FIG. 5(b')). After that, both signals with frame synchronization are sent to the modulator!
The data is transferred by IK and sent to the slave station via a wireless line.

In the single slave station, a demodulator 6 demodulates the received signal, and a frame synchronization circuit 7 synchronizes frames. In the switching circuit 8, according to the synchronization timing pulse fK from the frame synchronization circuit 7, from the switching signal (FIG. 5(d)) K of the channel setting circuit 9, the first signal sequence a to CH2=C)1
CH11 to CH15 are selected from the second signal series and switched.

The two series of signals received by the switching circuit 8 each select a predetermined channel, and are transferred to the carrier terminal equipment 0 as one series of signals shown in FIG. 5(e).

Incidentally, in the above embodiment, a method of synchronizing signals from each carrier terminal device at the master station was described, but the application of the present invention is not limited to this. In other words, channel selection is performed only at a predetermined slave station.

In order to perform switching, at the front stage of the switching circuit between nucleons,
It is also possible to achieve frame synchronization by delaying one of the signal sequences.

Also, the number of carrier terminal devices in the master station and slave stations.

The number of channels, etc. can be changed as necessary.

(6) Effects of the Invention As described above, according to the present invention, even when the corresponding master station performs channel allocation for a plurality of carrier terminal equipment, the output at the slave station is It is no longer necessary to manually match the number of terminal stations at the master station, and the number of carrier terminal apparatuses can be reduced. Therefore, it is possible to operate the system efficiently, which is effective in reducing the cost of the device.

[Brief explanation of drawings]

FIG. 1 shows the station configuration of the wireless system according to the present invention, and
The figure shows the conventional channel arrangement in the wireless system shown in Fig. 1, Fig. 3 shows the channel arrangement according to the present invention, Fig. 4 shows an embodiment of the transmitting/receiving station according to the present invention, and Fig. 5 shows the channel arrangement according to the present invention. 5 shows a time chart of signals in the embodiment shown in FIG. 4. In the figure, 1 and 11 are carrier end station devices 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 Reference numeral 9 indicates a switching circuit, 9 a channel setting circuit, and 10 a carrier end station device of a slave station. 6

Claims (1)

[Claims] 1. In a multidirectional multiplex radio communication system including one or more master stations having at least two or more carrier terminal devices, frame synchronization of signals sent from each of the carrier terminal devices, and A slave station that is assigned a channel across a plurality of carrier terminal devices selects each of the signal sequences corresponding to the plurality of carrier terminal devices, switches them, and transfers them to the carrier terminal device provided in the core slave station. A time division multiplexing wireless communication system characterized by: