JPS62128632A - Initial synchronization setting system for time-division multi-direction communication network - Google Patents

Abstract

PURPOSE:To attain the effective initial control for many slave stations by designating the slave station to apply initialization through a master station. CONSTITUTION:An initial setting part 10 is shown in an area enclosed by a broken line and includes a separating circuit 11 which separates a time slot related to the initialization, i.e., the discrimination code ID contained in a common signal time band T0 and a time slot for phase transmission P from the output of a synchronization fixing circuit 1, an initial synchronization fixing circuit 12, a distance difference detecting circuit 13 and a switch 14. When the clock signal is received from a master station, the initialization burst is sent to the master station based on the delay times of a delay time correcting circuit 3 and a delay circuit 4 or the delay time obtained by adding an integer multiple time of a single frame period T to the delay times of both circuits 3 and 4. While the master station checks the phase of said burst in the same way as a conventional technique and transmits an error if detected in the time slot for transmission of phase.

Description

[Detailed Description of the Invention] [Summary] Each slave station is configured so that the signals sent from the master station or from each slave station based on the 1-cock signal arrive at the master station as time-division signals for each slave station. To initialize the station's transmission time zone,
A signal for identifying the slave station is sent from the master station together with the clock signal, and only the slave station corresponding to this identification signal sends out a signal for initial setting.

[Industrial application field]

One master station and many slave stations are connected via a wireless communication line, and the signals sent by each slave station based on the clock signal from the master station are received at the master station sequentially as time-division signals for each slave station. To explain this communication method in more detail, as shown in FIG. A wireless communication network is formed, and the master station transmits a signal as shown in Figures 3a and 3b including a common signal To to each slave station at scheduled time T, and also transmits a synchronization signal included in this common signal. S
, and then different delay times (1,,12・
...tn) in the time zone (T+, T2...
...Tn) to each slave station (B+, Bh...B,
) and is the time period used for transmission or reception between the master station and the relevant slave station.

However, in order to maintain the time relationship between transmission and reception at the master station as described above, it is necessary to set the signal propagation delay time based on the distance (β1, β2...zn) between the master station and slave stations when designing the line. Even if the value of the delay element such as the delay of the slave station is set in consideration of the response delay time of the slave station device, etc., the difference in propagation delay time that cannot be predicted in the actual wireless line or due to the manufacturing of the device. Due to deviations, etc., when forming a communication network or replacing equipment,
Delay time (τl, T2...) from when each slave station receives the clock signal until it transmits to the master station
・Tn) must be adjusted by resetting the delay time of the delay equalizer for each slave station.

The present invention relates to an initial synchronization setting method for adjusting the delay time of each slave station.

[Conventional technology]

This initial synchronization setting is performed through consultation between the master station and the slave stations, so the communication time period (T1, T2...
...Tn), the time slots for initial setting (F), phase transmission (P), and meeting signal (C) are clocked (S) as shown in Figure 3 for initial setting. The common signal time zone (which has a time zone for one channel including
T, )) set+Jru.

It should be noted that only one line for transmitting data from the slave station to the master station is provided in the initial setting time slot.

The slave station performing the initial setting uses the time slot from the master station as the time reference, and uses the delay time calculated in advance so that the master station can receive the initial setting time slot approximately at the center of the initial setting time slot to send the initial setting burst. Send out.

The master station that receives this initial setting burst checks whether or not this received signal is at the correct position, including the hint a position and bit phase, and if there is an error, the error is transferred to the above-mentioned time slot for phase transmission. The signal is sent to the slave station to adjust the delay time of the slave station during initial setting.

Therefore, when multiple slave stations perform initial synchronization settings at the same time, adjustment signals from the multiple slave stations that are being configured arrive at the master station at the same time during the initialization time slot. It is not possible to identify the adjustment signals from each slave station, and therefore it is possible to perform initial settings for only one slave station at a time.

[Problem that the invention seeks to solve]

According to the present invention, initial settings of a plurality of slave stations can be performed in an orderly manner under the control of a master station, and communication lines can be quickly set up.

[Means for solving problems]

As shown in FIG. 3C, at the time of initial synchronization setting, the master station sends out a slave station identification code (ID) in the downlink time slot corresponding to the uplink initialization time slot, and each slave station Now, an initial setting establishment circuit is provided to detect this identification code (D), so that transmission can be performed only when the identification code of the albino station is sent from the master station.

[For production]

The initial setting time slot is only necessary for the uplink burst sent from the slave station to the master station, and is not needed for the downlink burst sent from the master station to the slave station. Therefore, by specifying the slave station to perform initial settings in this time slot, This prevents adjustment bursts from multiple slave stations from arriving at the initial setting time slot.

〔Example〕

FIG. 1 shows an embodiment of a slave station according to the present invention, in which a signal received from a master station is subjected to clock signal separation and data demodulation by a synchronization establishment circuit (1), and the data is processed by a data processing unit (2). ), and the signal to be transmitted from each data processing unit passes through a delay time correction circuit (3) for finely adjusting the delay time and a delay circuit (4) that gives a delay time calculated in advance. The transmission from the transmitting switch 5) is the same as in the conventional case.

The area inside the broken line is the initial setting section (10) added according to the present invention.
From the output of the synchronization establishment circuit (1), the time slot related to the initial setting, that is, the common signal time period (T0
), a separation circuit (l l) that separates the time slots for identification code (ID) and phase transmission (P), initial synchronization establishment circuit (2), distance difference detection circuit (43), and switch (
14).

When it is necessary to perform initial settings, switch 1 on each slave station.
Turn on 4 in advance.

The initial synchronization establishment circuit (12) determines whether the slave station identification code (fD) sent from the master station during the first period of the initialization time slot of the received signal is that of its own station; If it belongs to the own station, the transmission switch (5) is energized via the switch (14) to enable transmission. After the clock signal from the master station arrives, the delay time by the delay time correction circuit (3) and the delay circuit (4), or the delay time by an integral multiple of one frame period (T), is added. An initialization burst is sent to the master station using the added delay time.

The master station checks the phase of this burst, as in the prior art, and if there is an error, sends out this phase error in the time slot for phase transmission.

The distance difference detection circuit (13) of the slave station adjusts the delay time correction circuit (3) using this phase error signal, and sends out the initialization burst again as described above using the subsequent clock signal from the master station. Repeat until the phase error disappears and the adjustment is completed.

When the master station completes the adjustment of this slave station, it transmits the identification code corresponding to the slave station to be next adjusted at the beginning of the initialization time slot, and initializes the slave station as described above.

〔Effect of the invention〕

Since the master station can specify the slave station for which initial settings are to be made, initial adjustment of a large number of slave stations can be performed effectively and efficiently.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a slave station according to the present invention, FIG. 2 shows a communication network to which the present invention is applied, and FIG. 3 shows a time chart of this communication network. In the figure, A indicates a master station and B indicates a slave station.

Claims (1)

[Claims] A multidirectional communication network is formed by one master station (A) and many slave stations (B), and the master station simultaneously transmits signals including clock signals to each slave station in a time-sharing manner. In a time-division multidirectional communication network in which each slave station identifies the transmission time slot assigned to it based on the clock signal from the master station, each slave station Station identification code (ID
) is simultaneously sent from the master station to each slave station within the downlink time slot corresponding to the uplink initialization time slot of the common signal period (T_0) including the above clock signal, and the An initial synchronization setting method in a time division multidirectional communication network, characterized in that only a slave station can transmit a signal for initial synchronization adjustment to a master station.