JPS62256537A - Request line assigning device - Google Patents

Abstract

PURPOSE:To send a call control signal from a slave station to a master station without any possibility of collision by allowing a master station to add slot designation information after a preamble in a generated reference signal. CONSTITUTION:Slot designation information is generated by a controller 27 in a master station and slot designation information is added after the preamble in the reference signal generated by the preamble generating device 31. On the other hand, the synchronization controller 32 of a slave station selects a slave station sending slot based on the slot designation information sent from a unique word detector 35. Thus, the collision of transmission signals from the slave station to the master station is avoided and the transmission of the transmission signal to the master station is not retarded and the ground- disconnection of communication between slave stations is applied smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a requested line allocation device in which a master station centrally controls call connection and disconnection between a calling slave station and a called slave station.

[Conventional technology]

Figure 8 shows, for example, Mitsubishi Electric Technical Report V0 published by Mitsubishi Electric Corporation.
1.59. 6.1985R Ministry of Home Affairs Fire Department Satellite Communication System" This is a diagram showing a satellite communication system that adopts the required line allocation multiple access method shown in 1985R Ministry of Home Affairs Fire Department Satellite Communication System. 11) is a communication satellite, and (2) is a satellite line allocation function. A master station with (3a
X8b)---(an) are each slave stations.

FIG. 4 is a sequence diagram showing the call connection control communication between the slave station (3a) and the slave station (3b) via the master station (2). (8) is a line allocation request signal from the calling slave station (8a) to the master station (21), (9) is a call request signal from the base station (21 to the slave station (21),
sa) Line instruction signal to (ab), +101 (The river is a line instruction confirmation signal from the slave station (3a) (8b) to the master station (21), respectively, θ is the line instruction confirmation signal from the master station (2) to the slave station (3a) Line instruction completion signal to (8b), 0 fathom is continuity test sound between calling slave station (8a) and called slave station (3b), (141ij calling slave station (
3a) to the called slave station (sb) via the master station (21), a (transfer) is the transmission signal from the slave station (3b) to the called land network tBl
0η is the calling signal from the called land network (Mari to the slave station (3b), 0η is the call signal from the called slave station (3b) via the master station (2).
) to the calling slave station (3a), α is the response signal from the slave station (3a)
A) A response signal from a) to the calling terrestrial network (+gltri) indicates an empty state of communication with the calling terrestrial network i31.

Figure 5 shows the common line signal line (hereinafter referred to as the CCS line).
+41 Master station (2) and 6 slave stations (8a) to +51 (,
3bX8c) --- (an) is a time chart showing the access method of
b)---In CC8 line (4) to (3n), (
20a), (2*'b), (20c)---Fi master station (
The reference signal periodically sent from 21, En 1-IR station (
Call connection (1) sent in addition to reference signal 4 only when there is call connection control information from 2) to slave station (3a) (3b) --- (In)? a signal, and each slave station (aaX3b)
--- CCS line (11) from (Iln) to master station (21
), (+!2a), (22'b), (22c)
-1- is a slave station transmission frame, which is equal to the reference signal time interval from the master station (2).

(28a) s (213b) s (28c)
--- is a slot in each frame for each slave station (3a) (8
b)---(8n) is a slave station transmission slot that can be randomly accessed.

+241 indicates that the slave station (3a) is the slave station transmission slot) - (23a
), the call connection (1) al signal sent within
19 is the call connection control signal sent by the six slave stations (3a) (3b)! This indicates that there was a collision because the messages were sent simultaneously within the slave station transmission slot (sa).

Figure 6 shows the master station f21 or slave stations (13a) (8b) --
- (8n) is a configuration diagram of a request line allocation device for accessing CCS line nl (61,
b) is a control device that generates/identifies call connection control signals and manages signal sequences, etc., and Tsuru is a control device that temporarily transmits call connection control signals generated by the control device until it is time for its own station to send them. A transmission buffer for keeping it on standby, @ is an encoding device for converting the transmitted Jij into a pit sequence having an error correction or detection function to deal with transmission errors on CC8 lines + 41 fil, ■ is a code converted transmission 4
A modulator for transmitting the signal to the CCS channel @ 14+ fi+, 0]) is added to the beginning of the transmitting signal 4, and extracts the carrier recovery bit string and clock for regenerating the carrier in the receiving station's demodulator ■. A preamble generation device (to) generates a preamplule including a bit timing reproduction pit string for reproducing data, a unique word for detecting the beginning of data (call connection control signal), etc. The start time of the slave station transmission slot is determined based on the signal from the unique word detection device (to) that has detected the reference signal from (2), and if there is transmission No. In the synchronization control device that supplies signal transmission timing to In order to
Synchronous control circuit that supplies signal transmission timing to (to)
is an intermediate/high frequency device that includes a frequency converter, large power amplifier, power supply device, antenna, etc. for transmitting radio waves to CCS line (41 (61), A demodulator for returning the signal, (to) a unique word detection device to detect a unique word to find the beginning of data from the demodulated baseband signal, and (to) a coding device at the transmitting station for encoding. (b) is a receiving buffer for passing the call connection control signal to the control device fin.

Next, the operation will be explained using an example in which the slave station (3a) makes a call to the slave station (8b) via the master station (21), and the slave station (3a) (3b) enters a communication state. Further, in this example, as shown in FIG. 5, from the master station (21) to each slave station (8aXsb
) --- CC8 line to (an) (4: Reference signal (2G&) (lb) sent from the master station (21) at a fixed period on
(goc) -- (Jf) slave station transmission frame (22a)
(L!b) (22c) -- Divide one into three each g23a
X23b) (Ha)), (23d) (28e) (28
f) Divide into -=- child station transmission slots, and send the valley child station (3a
) (3'b) --- (Jn) is the transmission slot for each slave station (2
3a) (23b) (28a) --- Random access will be explained.

In FIG. 4, first, when the slave station (8a) receives a call request signal (71) from between the calling land networks, the called slave station (3b)
A line assignment request signal (8) containing a signal that can identify the called subscriber on the called land network + Bl is transmitted to all master stations (2:) via the CC8 line (6). In this example, the call request signal ( 7
) in which all the selection signals are transferred, but in the case of overlap transfer in which each digit is sent one by one, a large number of line allocation request signals (8) may be sent. Now, the slave station (3a) is receiving the reference number 1g (20,
a) and immediately transmits the first slave station transmission slot (2aa
), the line assignment request signal (8) is received by the master station (21) without colliding with the signals from other slave stations (3b), (3c)---(8n). can.

However, when the slave station (3b) sent the signal (26) to the slave station transmission slot (23d), the slave station (3a) sent the signal (26). I
If the J request signal (8) is sent, the master station (21) cannot receive the line allocation request signal (8).

In this 10th case, the slave station (3a) does not receive the line instruction signal (9) from the master station within a certain period of time, so the line assignment request signal (8) is sent to another slave station (3b)---( 21n) It is determined that the signal was not received by the station (21) due to the collision with No. G of Kaguchi, and the line allocation request signal (8) is retransmitted with a delay of a randomly determined number of slots.

Next, when the master station t21 correctly receives the line allocation request signal (8), it selects an empty communication path and sends the calling slave station (3a
), the line instruction signal (9) is set with the transmission frequency - instantaneous and the reception frequency #≠ of the selected communication path and sent. In addition, to the called slave station (3b), the transmission frequency related to the selected call -→ and the receiving frequency setting f, the selection signal used in the called land network, etc.? In this example, one line instruction signal (9) instructs the calling and called slave stations (8a) (8b), but the calling slave station (3a) and the called slave station (3b) It is also possible to separate the signal into two signals.

Next, the slave station (3a) that received the line instruction signal (9) (
3b), after checking the validity of the line instruction signal (9:), if it is correct, sends the line instruction confirmation signal tlot4 to the master station (21,
It is sent using the same procedure as the line allocation request signal (8).

This line instruction confirmation signal tlol and i+g gold calling slave station (
8a) and the receiver receive it from the slave station (sb), the master station (21) sends all line instruction completion signals to the slave stations (8a) and (3'b).This line instruction completion signal σ is also a line instruction signal. (91
Similarly, the signal may be divided into two signals and transmitted to the slave stations (8a) and (3b).

Next, the line instruction completion signal Q21't - the received slave station (
3aXab) prepares for a 4-test test of the communication path specified by the line instruction signal (91) from the master station (21), and sends 4 test sounds tJsi from the calling slave station (3a) to the called slave station (8b). , continuity test sound 0 returned by the called slave station (3b)
When 3 is detected by the calling slave station (3a), it is determined that the continuity test is successful, and the transmission of the continuity test sound 01 is stopped, and the continuity test sound 01 is sent to the master station (2) in the same manner as the line assignment signal (8) to the continuity signal 14. do.

The master station (21) that received this conduction signal α41 sends the 4th communication signal 1141 to the called slave station (3b),
The slave station (3b) that received the signal 4 sends a calling signal including the necessary selection number 1h to the called land network tBl, and
Response signal 8 from B+ (wait for Iel◎Subsequently, response signal '
The slave station (3b) that received 8Q.
1, sends a response signal f1η to the master station (2) in the same manner as the line allocation request signal (8), and sends a response signal f1η to the master station (2) through
)' i The master station 121 that received the response relays the response (a) to the calling slave station (3a).

Finally, the calling slave station (3a) that received the response ID 1η from the master station te+ sends a response signal - between the calling land networks, and between the calling and called slave stations (8a) (8b). is the communication status■
become.

In the call connection control signal sequence described above, the problems in the conventional example are sufficiently illustrated, so a description of the call disconnection control signal sequence will be omitted.

Next, using FIG. 6, the relationship between the call connection r control sequence and the requested line allocation device will be described below.

In the master station (21), the synchronization control device (2) gives transmission timing to the preamplifier generation device 6η at the time intervals of the slave station transmission frames (22a) (ll)---, and sends the reference signals (20a) (20b ) (2oc)---supply the reference signal (la) (!
1Ob) (20(ri---'i CC8 line (4)
to the intermediate/high frequency device (to). At this time, from the master station (21) to the slave stations (3a) (13b)---(an
) to the call connection control signal (if there is 21, in order to avoid that the preamplule pit and data bit overlap at the entrance of the modulator jt-), the call connection control signal is sent one time later than the sending timing to the preamplule generator!f01). Depending on the sending timing to the transmission buffer, the transmission data (call connection! + control signal) is sent to the encoding device 4, and the signal encoded by the encoding device 4, base #L times signal 2oa) (sob) (+o
c) After that, it is sent to CCS rounding (4).

On the other hand, in the 6th slave station (3aX3b)---(3n), the demodulator receiving the signal 9 on CC8 line (41)
The input signal is completely demodulated, the clock is recovered from the clock recovery pit, and the unique word detection device (to)
Ibarcho baseband signal to.

This unique word detection device detects signals from a master station (2) to a slave station (
8aX8b)---(8n) F reference signal (2oa)
(2ob) (2°c) --- When a unique word used in one is detected, the received signal is changed to the reference signal (20a
) (20b) (20C) -m- is determined, the subsequent bit string is decoded by the decoding device (7), and then passed to the control device - via the receiving buffer (b). In addition, when the unique word detection device (to) detects the above unique word and notifies it to the synchronous control device ■, the synchronous control device (to)
As this detection point and the start time of the first slave station transmission slot, is the slave station transmission slot? The preamplule randomly generated by the eTJ and the above transmission data are sent to the selected slave station transmission slot on the 008 line (6) after a certain period of time delay from the preamplule.

In addition, the reception operation of the CC8 line (5) in the master station (2) and the upper Rochi is as follows:
Among the reception operations at slave station (8a) (1)---(
8n) to the master station (2) and detects the unique word from the slave 1 station (!3a) (3b)---(an) to the master station (2)
The difference is that no timing signal is issued from the unique word detection device (to) to the synchronization control device 4, and the timing signal is not output from the unique word detection device (to) to the synchronization control device 4. When a collision occurs, the signal lX!ll is not stored in the reception buffer (to) in the master station (2:) because the unique word is not detected or the data cannot be decoded.

[Problem that the invention seeks to solve]

As described above, the conventional request line allocation device gives each slave station equal permission to use the slave station transmission slot on the common signal line from the slave station to the parent station, so There was a possibility of collision in the call control signals to the station. Furthermore, in order to avoid secondary collisions in which signals collide once, each slave station that detects a collision must retransmit the transmission to a slave station transmission slot delayed by a random number of slots (even in this case, there is no chance of re-collision). (although this is still a possibility), there are problems in that call control signals cannot be sent to the master station and delays in connection and disconnection of communication between slave stations become large.

This invention was made to solve the above-mentioned problems, and includes a call control signal sent from the slave station to the master station, which is sent back to the master station in response to a signal transmitted from the master station to the slave station. It is an object of the present invention to provide a requested line allocation device that can predict and predict the position of a slave station transmission slot of a number and can deliver a call control signal from a slave station to a master station without the possibility of collision.

[Means for solving problems]

In the requested line allocation device according to the present invention, in the master station, the 88'lI@ device has a function of generating predictable slot designation information, and the preamplifier generating device has a function of generating a preamplule in the generated reference signal. Later, a function to add the above slot designation information is added, and on the other hand, in the slave station, the unique word detection device has a function to pass the slot designation information following the unique word in the reference signal to the synchronous control device. The device has several functions for supplying signal transmission timing to the preamplifier generation device and the transmission buffer based on the slot designation information.

[Effect]

The requested line allocation device according to the present invention provides, in a master station, a slave station transmission slot for a call control signal from the slave station to the master station that is returned in response to a call control signal from the master station to the slave station generated by the control device. The position is predicted by the control device, and slot designation information including the slave station transmission slot position and slave station number is added to the end of the preamplule in the reference signal by the preamplifier generator and sent to the slave station. . In response to this, 1, in the slave station, a unique word detection device detects a preamplule in the reference signal, and passes the slot designation information added after the preamplule to the synchronization control device. In response to this,
The synchronization control device of this slave station sends a call control signal to a predetermined slave station transmission slot based on the slot designation information.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained in which the slave station (3a) is connected to the slave station (3b).
) will be explained using FIGS. 1 and 2. In Figure 1, the master station (2
Call connection control signals from 1 to the calling and called stations (3a) and (3b), (20b) are the calling and called stations (3a)
(ab) are respectively sent to slave stations (1a slot (23d) (28
e) Criteria 1 including slot designation information for granting transmission permission
No. H, 1251M is a call connection control signal transmitted by the slave station (3a) (ab) as a response to the call connection control signal 3υ. In this example, the call connection control signal 3υ is a line instruction signal, a call connection control signal, and one example is a line instruction confirmation signal [
Equivalent to.

FIG. 2 is a configuration diagram showing a requested line allocation device at each station according to an embodiment of the invention. In the figure, the same reference numerals are equivalent to or equivalent to the conventional device, and the control device port and preamplifier generator C1υ are designated by the same reference numerals. In the master station, slot designation information is generated at the control device mouth, and the slot designation information is added after the preamplule in the reference signal generated by the unique word generation device 6υ, and on the other hand In the slave station, the only difference is that the synchronization control device selects the slave station transmission slot based on the slot designation information sent from the unique word detection device.

Among the call connection control signals sent to (3a) and (3b),
The signals for which a response is expected from these slave stations (8a) (3'b) are the line instruction signal +91K, and both slave stations (3'
a) Line instruction confirmation signal from (3b) +to+ (Il
l e Line instruction completion signal (1'! Calling slave station for J (
The conductive signal I from 3a).

In Figure 1, the master station (2) sends a line instruction signal (9) to all C
When the call connection control signal 211 added to the reference signal (lla) of the C8 line (41) is sent to the slave stations (3a) (lb), the master station (21 is the slave station (3a) (8b)) (If 91 is received, be sure to transmit the call connection control signal sequence number to the master station (21) after the required time (the time required for certain processing of the line instruction confirmation signal f10+ (If) and the propagation delay time). I am aware of this. In this case,
How long does the above take? If the number of slots is 2, the master station f21 sends a reference signal (2ob) to each slave station (8aX8b)---(8n) at the beginning of the next frame, for example, with a slave station transmission slot) (,1ad)U calling child. Station (3a)m, slave station transmission slot (Ha) sends out slot designation information to be used exclusively for the called slave station (8b). The reference signal (20b) containing this slot designation information i received from the slave station (
8a) and 8b are slave station transmission slots (lad), respectively.
) (2f9e) Line instruction confirmation signal +lot (Il
l″f: Sending, the slave station (!3c)---(an) cannot send a transmission signal to the slave station transmission slot (23d) (23e).ro However, in the reference signal - , slave station transmission slot positions and slave station transmission slots that are not designated as exclusive use slave stations are for all slave stations (3a) (3b) --
-(fin) can be accessed.

Also, regarding conductive communication '8Q41 from the calling slave station (3a), the slave station transmission slot position to be transmitted by the slave station (8a) is determined by the same procedure as the line instruction confirmation signal (lO).
1 is specified by the reference signal, but the difference is that the slave station (3
a) is the time required until all conduction signals 04 can be transmitted, that is, the number of slots to be delayed.

Next, the relationship between the above operation and the request line allocating device will be explained with reference to FIG.

Before transmitting the reference signal (21) b) in FIG.
c11) Next frame (g2b) 1st slave station transmission slot) (221(1) 2nd slave station (3a), 2nd slave station transmission slot 7) (2!8e) Used for i slave station (3b) Notify the specified slot price information. In response to this, the preamble generation device 6Xl adds the slot designation information after the preamplule in the reference signal (20b) and transmits it as the reference signal (20'b). This reference signal (g
ob)'f: Each received slave station (3a) (8b)---(
8n) Transfer the slot designation information following the unique word in the reference signal (201) to the synchronization control device (2). In response to this, each slave station (8aX8b)---(an
) performs the following operations according to the slot designation information. First, the first slave station transmission slot (
23d), a slave station (ab) other than the slave station (3a)
)(ac)---(3,n), even if the transmission data is in the transmission buffer ω, the unique word generator 0])
and does not pass the transmission timing to the transmission buffer (c). Next, at the start of the second slave station transmission slot (He), the slave stations (3aX3c)---(8n) other than the slave station (8b) even if the transmission data is in the transmission buffer (C). , the transmission timing is not passed to the unique word generator Q and the transmission buffer (to).

However, if there is no slot designation information, the above process is not performed and the same process as before is performed.

In addition, in the above embodiment, from the master station (2) to all the slave stations (3a) (
ab) ---(8n) Although all the methods of sending out the reference signal at regular intervals to indicate the beginning of the frame have been shown, a polling method in which the reference signal is sent out at irregular synchronization may also be used.

Furthermore, it is not affected by the control line transmission speed.

Also, in the ccs times, *14++51 is from the master station (2) to the slave stations (3a) (3b) --- (In) slave stations (8a) (a'b
)---(an) Although two carriers are used from the main station to the master station (2), it may be provided on the l carrier in a time-sharing manner.@Also, in the above embodiment, call connection control in communication between slave stations However, the same effect can be obtained for call disconnection control.

Furthermore, although the above embodiments have been described with respect to satellite heating, the same effect can be achieved even with mobile radio communication such as a car phone.

〔Effect of the invention〕

As described above, according to the present invention, slot designation information is added to the reference signal from the master station to the slave station, and the slave station is configured to select the slave station transmission slot position based on this slot designation information. Therefore, it is possible to avoid collisions of transmission signals from the slave station to the master station, the delivery of transmission signals to the master station is not delayed, and the effect is that communication between four stations can be connected and disconnected smoothly. There is

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention. A diagram showing how each station accesses the common line signal line of the requested line allocation device, FIG. 2 is a block diagram showing the requested line allocating device according to an embodiment of the present invention, and FIG. 3 shows a general one master station. A schematic diagram showing a satellite communication system consisting of multiple slave stations. Figure 1 is a sequence diagram showing call connection control communication between two slave stations via a general master station. Figure 5 is a diagram showing conventional request line allocation. Figure 6 shows how each station accesses the common signal line of the equipment.
The figure is a block diagram showing a conventional request line allocation device. In the figure, the penalty is the control device, (to) the transmission buffer, 01
) is the preamplifier generator, and the function is the synchronous control device, (to)
is a unique word detector.

Claims (1)

[Claims] (1) A communication path for communication between slave stations and a common line signal line for call control between the master station and slave stations are provided, and data is transmitted from the master station to the slave stations via this common line signal line. The reference signal obtained is set as the start time of the slave station transmission frame, and one frame up to the next reference signal is divided into one or more slave station transmission slots,
In a request line allocation device in which each slave station transmits a call control signal to the master station within its one slave station transmission slot, the master station allocates the communication path to the calling slave station and the called slave station,
The master station includes a control device that generates and identifies call control signals and generates slot designation information, a transmission buffer that temporarily stores call control signals from this control device, and a preamplifier that includes unique words. The slave station is equipped with a preamplule generation device that adds the slot designation information after the preamplule in the generation and reference signals, and a synchronization control device that supplies signal transmission timing to the preamble generation device and the transmission buffer. , a control device that generates and identifies a call control signal, a transmission buffer that temporarily stores the call control signal from the control device, a preamplule generation device that generates a preamplule including a unique word, etc., and a reception device. a unique word detection device for detecting a unique word of the data, and a synchronization control device for supplying signal transmission timing to the preamplule generation device and the transmission buffer according to slot designation information following the unique word from the unique word detection device. A request line allocation device comprising: