JPS61210735A - Auxiliary signal transmitting method - Google Patents

Abstract

PURPOSE:To transmit efficiently an auxiliary signal at the transmitting signal speed in which the high speed is suppressed by providing a time slot assigned in common to a part of the frame synchronizing signal and an auxiliary signal or all parts of the frame synchronizing signal in one frame of a transmission line frame constitution. CONSTITUTION:When it is judged that the frame synchronization of the opponent station is not established, the signal outputted from a frame synchronizing signal multiplexing circuit 2 is outputted as it is. The output signal is sent through a modulating part 4, an antenna sharing part 5 and an antenna 6 to the opponent station. At the auxiliary signal separating circuit 9, on the basis of a frame pulse 801 outputted from a frame synchronizing circuit 8, an auxiliary signal 901 of a time slot TCOMMON in figure (b) is separated and outputted and out of the auxiliary signals in the time slot TCOMMON, an opponent station frame synchronizing information 902 (self-station frame synchronizing information time-base-multiplexed by an auxiliary signal multiplexing circuit 3 of the opponent station) is outputted to the auxiliary signal multiplexing circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to a time division multiplex communication system. In particular, the present invention relates to a signal transmission method in which a transmission line auxiliary signal such as a supervisory control signal is time-division multiplexed and transmitted with a main signal.

〔overview〕

The present invention is a time division multiplex communication system in which a frame synchronization signal is added to the main signal for transmission, and in an auxiliary signal transmission method that defines a method for inserting an auxiliary signal to be transmitted, frame synchronization is established at the receiving end. By allocating the time slot for transmitting the auxiliary signal to transmit the frame synchronization signal and increasing the number of frame synchronization signals, frame synchronization at the receiving end is accelerated, and communication is improved by transmitting the auxiliary signal. It provides a method that does not require increased speed.

[Conventional technology]

In the conventional method for transmitting transmission line auxiliary signals (hereinafter referred to as auxiliary signals) such as supervisory control signals by time division multiplexing them with the main signal, a time slot dedicated to the auxiliary signals is provided in the transmission line frame. Auxiliary signals were transmitted via time slots. FIG. 3 shows the frame structure of a transmission line frame used in such a conventional method. One frame consists of a j-bit frame synchronization signal time slot 'rpsn pit and an auxiliary signal time slot T.
Time slot T□1N for main signal of sv and bit
The auxiliary signal consists of an auxiliary signal time slot) Ts
It was transmitted via v.

[Problem that the invention seeks to solve]

When an auxiliary signal is transmitted using such a frame configuration, the transmission line signal speed becomes faster than the main signal transmission speed by the frame synchronization signal time slot I'TF and the auxiliary signal time slot l'Tsv. Because the frequency bandwidth is widened, the signal speed of the transmission path is high, especially in communication systems where the frequency bandwidth occupied by the transmission path is limited due to issues such as effective use of radio waves, such as wireless systems that use space for the transmission path. Also, it is undesirable that the time slot T for the frame synchronization signal in the frame
Although the transmission line signal speed can be suppressed by reducing the number j, in this case there are problems such as an adverse effect on frame synchronization pull-in characteristics at the receiving end of the transmission line.

The present invention aims to improve these problems and provides an auxiliary signal that can transmit auxiliary signals without adversely affecting the frame synchronization pull-in characteristics at the receiving end of the transmission line and suppressing the increase in the signal speed of the transmission line. The purpose is to provide a signal transmission method.

[Failure to solve the problem]

The present invention is a time division multiplex transmission system that transmits a frame synchronization signal, an auxiliary signal, and a main signal within one frame. The period is 2. Frame synchronization signals are allocated for m -1-n bits 1 to 1 in one frame, and after frame synchronization is established at the receiving end, m bits are allocated for m -1-n hints in one frame. A frame synchronization signal is assigned to n hints, and an auxiliary signal is assigned to n hints.

Further, the auxiliary signal may be a monitoring signal.

[For production]

Until frame synchronization is established at the receiving end of the transmission path, a frame synchronization signal with a long number of bits is transmitted so as not to adversely affect the frame synchronization pull-in characteristic at the receiving end. When frame synchronization is established at the receiving end, a frame synchronization signal with a short number of bits is transmitted to confirm that frame synchronization is maintained. The number of bits of this frame synchronization signal is smaller than the number of bits of the frame synchronization signal until synchronization is established, and the difference in the number of bits is allocated as bits for auxiliary signal transmission.

As a result, the transmitted signal can be used more effectively than the method of transmitting the auxiliary signal together with the frame synchronization signal with a long number of bits so as not to adversely affect the frame synchronization pull-in characteristics regardless of the frame synchronization state at the receiving end. .

Establishment of frame synchronization at the receiving end is transmitted by an auxiliary signal in the frame signal received on the transmission path in the opposite direction.

〔Example〕

Hereinafter, means for realizing the method of the present invention will be explained based on the drawings.

FIG. 1 is a frame configuration diagram showing the format of an embodiment transmission path frame that implements this method. Figure 1 (al indicates the format of the transmission line frame used during the period when frame synchronization is not established at the transmission line receiving end, and (bl indicates the format used during the period after frame synchronization is established at the transmission line receiving end) The format of the transmission path frame is shown in FIG. 2. FIG. 2 is a block configuration diagram showing the configuration of an embodiment device that implements this method.

First, a transmission line frame according to an embodiment of the method of the present invention will be explained based on FIG.

In the frame configuration of this transmission path frame, until frame synchronization is established at the transmission path receiving end, the frame IJiJ]
The sum of the m bits of the signal-only time slots 1 to TF' and the n bits of the auxiliary signal shared time slot TCOH1'1ON is allocated as the frame synchronization signal time slot T, while after frame synchronization is established, the frame As a signal to confirm that synchronization is achieved, only m bits of the time slot TF' dedicated to the frame synchronization signal in the time slot TF are allocated to the frame synchronization signal, and
N bits of N are allocated for auxiliary signals. When comparing the frame structure according to the present invention and the frame structure according to the conventional method, if j=m+n, frame synchronization within one frame is achieved before frame synchronization is established at the receiving end of the transmission path. Although the amount of information in the signals is the same, the frame synchronization characteristics are the same, and the transmission capacity of the auxiliary signal after establishing frame synchronization is also the same, the transmission path signal speed can be kept n bits lower per frame. I can do it.

Next, an embodiment of an apparatus for implementing this method will be explained based on FIGS. 1 and 2.

This embodiment device includes a frame synchronization signal generation circuit 1 that generates a frame synchronization signal 100, a frame synchronization signal multiplexing circuit 2 that inputs and multiplexes a main signal 250 and a frame synchronization signal 100, and an auxiliary signal 350 and an autonomous signal. an auxiliary signal multiplexing circuit 3 that inputs the station frame synchronization information 800 and the other station frame synchronization information 902 and multiplexes the auxiliary signal 350 and the local station frame synchronization information 800 to the output of the frame synchronization signal multiplexing circuit 2; A modulating section 4 that modulates the output of the multiplexing circuit 3; an antenna common section 5 having an antenna 6 that inputs the output of the modulating section 4 and outputs it to the input of the demodulating section 7; A frame synchronization circuit 8 generates frame synchronization information 800 and a frame pulse 801, inputs the input of the demodulator 7 and the frame pulse 801, generates frame synchronization information 902 of the other station, and generates the main signal 9.
00 and an auxiliary signal separation circuit 9 that outputs an auxiliary signal 901.

Now, the frame synchronization signal multiplexing circuit 2 uses the frame synchronization signal 100 generated by the frame synchronization signal generation circuit 1.
is the time slot T for frame synchronization signal in the main signal 250.
F is time division multiplexed. In the auxiliary signal multiplexing circuit 3,
Based on the frame synchronization information 902 of the other station output from the auxiliary signal separation circuit 9, if it is determined that the frame synchronization of the other station has been established, the auxiliary signal is added to the signal output from the frame synchronous signal multiplexing north FQ2. The signal 350 and local station frame synchronization information 800 correspond to time slot T. 0MM0
N and is time-division multiplexed and output in the frame configuration shown in FIG.
The signal output from is output as is.

This output signal is sent to the other station via the modulation section 4, antenna common section 5, and antenna 6. Further, the received signal from the other station is transferred to the demodulation section 7 via the antenna 6 and the antenna common section 5, and the received signal is demodulated by the demodulation section 7. In the frame synchronization circuit 8, frame synchronization is established with the received signal from the other station demodulated by the demodulation section 7, and information as to whether frame synchronization is established is sent to the auxiliary signal multiplexing circuit as own station frame synchronization information 800. 3, the frame pulse is also output to the auxiliary signal separation circuit 9. The auxiliary signal separation circuit 9 separates and outputs the auxiliary signal 901 of the time slot T.0□ON in FIG.
Time slot T. Output to the auxiliary signal multiplexing circuit 3 of the auxiliary signals in [1MM0) 11902 (local station frame synchronization information time-division multiplexed by the auxiliary signal multiplexing circuit 3 of the remote station) be done.

As explained above, efficient transmission of auxiliary signals can be realized with this embodiment device.

Furthermore, in this example device, information on whether frame synchronization has been established at the other station is time-division multiplexed in the time slot of the auxiliary signal of the transmission path frame, but superimposed modulation is applied to the carrier wave of the transmission path. The present invention can be carried out even if the data is sent out over a period of time.

Further, in this embodiment, frame synchronization is concentrated and multiplexed within one frame, but the present invention can be practiced even if the frame synchronization signal is distributed and multiplexed within a frame.

In addition, if a state in which frame synchronization is not established at both ends of the transmission path continues for a predetermined period of time or more, a means of intermittently using a frame containing an auxiliary signal instead of a frame containing only a frame synchronization signal, or a means of using this predetermined It is possible to include means for determining that synchronization has been established at the receiving end when the time is reached.

〔Effect of the invention〕

As explained above, the present invention provides one of the transmission line frame configurations.
By providing a time slot in the frame that is commonly assigned to a part of the frame synchronization signal, the auxiliary signal, or the entire frame synchronization signal, it has the same frame synchronization pull-in characteristics at the receiving end of the transmission line as the conventional method. However, there is an effect that the auxiliary signal can be efficiently transmitted at a transmission line signal speed in which speed increase is suppressed.

[Brief explanation of the drawing]

FIG. 1 is a frame configuration diagram of a transmission line frame related to the method of the present invention used in a time division multiplex communication system. FIG. 2 is a block configuration diagram showing the configuration of an embodiment apparatus related to the method of the present invention. FIG. 3 is a frame configuration diagram of a transmission path related to the conventional method. ■... Frame synchronization signal generation circuit, 2... Frame synchronization signal multiplexing circuit, 3... Auxiliary signal multiplexing circuit, 4
... Modulation section, 5... Antenna common section, 6... Antenna, 7... Demodulation section, 8... Frame synchronization circuit, 9
...Auxiliary signal separation circuit, 100...Frame same 1υ
1 signal, 250.900...Main signal, 350.901
... Auxiliary signal, 800 ... Local station frame synchronization 11
[, 8ot... Frame pulse, 902... Opposite station frame synchronization information. Patent Applicant: NEC Corporation Ne4 Agent: Patent Attorney Nao Takashi IdeConstruction diagram of the transmission line frame of the conventional example (23) and configuration diagram of the embodiment device (2) Sonoichi'l"11-

Claims (2)

[Claims] (1) In a time division multiplex transmission system that transmits a frame synchronization signal, auxiliary signal, and main signal within one frame, the period until frame synchronization is established at the receiving end is
Assign a frame synchronization signal to m+n bits in a frame, and after frame synchronization is established at the receiving end, assign a frame synchronization signal to m bits and assign an auxiliary signal to n bits for m+n bits in one frame. An auxiliary signal transmission method featuring: (2) The auxiliary signal is a monitoring signal.
) Auxiliary signal transmission method described in section 2.