JPS6089142A - Burst voice communication system - Google Patents

Abstract

PURPOSE:To avoid duplication of transmission and to prevent reduction in communication capacity by providing a transmission request means where plural transmission and recetion stations select automatically a corespondence party and make talking. CONSTITUTION:After radiation of a radio wave from any of transmission/reception stations 1-N, a desired station of the transmission and reception stations 1-N transmits a message. In this case, when the transmission/reception stations 1-N requesting the transmission are plural, a station desiring correspondence requests transmission via an identification code coded so that the station is selected automatically. The identification code consists of a code series of binary logical values 0, 1 different from each transmission/reception station and priority utilizing communication lines is given in advance to the identification of each transmission reception station respectively. The identification code is outputted to the communication line via a transmission/reception changeover device 13 and an antenna 14 as a transmission request signal from each transmission/reception station.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a burst voice communication system, and more particularly to a burst voice communication system in which voice messages are exchanged using a wireless line.

The burst voice communication method is well known, in which multiple transmitting and receiving stations that share a wireless line on the same frequency channel communicate their own voice messages with compressed bandwidth while shifting the communication time zone, that is, using the line in a time-division manner. ing.

According to such a burst voice communication method, the wireless line required for one communication is only one shared channel, resulting in high frequency utilization efficiency, and band compression transmission can effectively shorten the communication time. It has various features such as being able to improve resistance to interception by making it significantly shorter than the interception time.

In the burst voice communication system, voice messages sent from multiple transmitting and receiving stations communicating with each other are
1v1 (Pulse Amplitude Mod
After being stored as a format in which a shared carrier frequency is modulated by a pulse modulation method such as (latio) modulation, the data is outputted all at once in a time-division manner according to a preset priority order.

For example, the communication capacity is 16Kbit (kilobit)/S
Assume that a transmission path of EC (seconds) is used by io transmitting/receiving stations, and a voice message is digitized and compressed at 1.6 Kbit/8 EC.

The communication time for each of these 10 transmitting and receiving stations is approximately 0.
．． The interception time is 1 second, which is significantly shorter than the normal interception time of about 5 to 6 seconds.

The anti-interception property of communication can be significantly enhanced, and this feature and the effective use of frequencies are fundamental features of the burst voice communication system as described above.

However, in this type of conventional burst voice communication system, when two or more multiple subscribers (transmitting/receiving stations) use the same burst voice communication system, the origin of multiple communications by these multiple subscribers is It is necessary to allocate the order, and this operation is performed manually between subscribers.
The control is carried out at a semi-R1 level based on the preset control content, and as a result, a decrease in the communication capacity per unit time via the burst voice communication system is unavoidable. The disadvantage is that it inevitably becomes complicated.

Furthermore, in order to avoid this drawback, a control station is provided to centrally control the communications of each transmitting and receiving station.

Not only does the scale of the burst voice communication method increase, but it also causes problems such as vulnerability in terms of communication security due to failure or artificial destruction of the control station, and loss of confidentiality due to local increases in communication volume.

An object of the present invention is to eliminate the above-mentioned drawbacks, and provide a transmission request means that allows a plurality of transmitting/receiving stations constituting a burst voice communication system to automatically select a communication partner and make a call. A burst voice communication method that can completely automatically avoid duplication of transmissions, thus basically suppressing a decline in communication capacity per unit time, and fundamentally eliminating the need for control operations for this purpose. Our goal is to provide the following.

The system of the present invention is a burst voice communication system in which multiple transmitting/receiving stations use band-compressed voice messages on the same frequency channel to communicate with arbitrary parties, and all transmitting/receiving stations that wish to transmit voice messages occupy the frequency channel. If there are multiple transmission requests, fLf, transmission 1iU order is self dl.
The transmission request means is configured to execute a transmission request set in a J-wise manner.

Next, the present invention will be described in detail with reference to the drawings.

FIG. 41 is a block diagram showing an embodiment of the burst voice communication system according to the present invention.

Transmitting/receiving station (1) 1 to 1 transmitting/receiving station (N) N is burst voice communication according to the present invention (I'l 11
ffl transmitting/receiving station, and each transmitting/receiving station has the same configuration.For example, transmitting/receiving station (1) 1 is a transmitting 4f
ill, delivery request signal generation time i:'=? 't J 2
, transmitter/receiver switch 13, antenna 14. It is composed of a transmitting station identification circuit 15, a receiver 16, and the like.

Among the configuration contents of each transmitting/receiving station, the transmission request signal generation circuit 12 and the transmission requesting station identification circuit 15 are directly related to the present invention, and the others are general configurations of the transmitting/receiving station in the normal burst voice communication system. be.

In the burst voice communication system, N transmitting/receiving stations as shown in FIG. 1 communicate with other stations while occupying the communication line in the above-mentioned time division manner. Priority order assignment and other controls in the operation of transmitting/receiving stations in a communication system are automatically performed in contrast to conventional manual processing, and the operation is performed as follows: Transmitting/receiving station (1) When l wants to communicate with a desired transmitting/receiving station, it transmits via output line 1101.
The transmission command signal is sent from ll to the all transmission request signal generation circuit 12 to output a transmission request signal, and this is sent to the output line 12.
01. It is emitted as a transmission request radio wave 1401 from the antenna 14 via the transmission/reception switch 613 .

The above-mentioned transmission request signal is sent to the own station in accordance with the communication priority order assigned to each transmitting/receiving station in advance, after the end of communication if there is communication with any other active transmitting/receiving station, or immediately if there is no communication with any other transmitting/receiving station. This is a signal requesting the transmission of a signal, and any format may be used as long as the content matches this purpose. Figure 2 shows the characteristics of the transmission request signal in the embodiment of the gt diagram. In the request signal characteristic diagram, 4.

When the diagonal transmitting/receiving station in the embodiment shown in FIG. 41 wants to transmit for 1T, it transmits it via the communication line while repeating the P identification code shown in FIG. 2 several times to several tens of times.

The identification code P is a binary logical value n that differs for each transmitting and receiving station.
It is composed of On, II, and It code sequences.

Moreover, the identification code of each transmitting/receiving station is given a priority order for use of the communication line in advance, and such identification code is sent from each transmitting/receiving station as a transmission request signal to the transmitting/receiving switch 1.
3 and the antenna 14 to the communication circuit, □.

The identification code P only needs to be different for each transmitting/receiving station.

For example, if there are 10 transmitting and receiving stations, 4 bits is sufficient, and it can be repeated a to l times at random in time.
It is sent several times. By continuing to transmit the identification code multiple times in a temporally random manner, the chance of data collision with other transmission request signals is greatly reduced.The valley transmission request signal is sent as a received signal 1402 to the antenna 14. Transmission requesting station identification circuit 15 via transmission/reception switch 13
Under the control of a built-in station identification program, the transmission request station identification circuit 15 identifies the transmission request signal addressed to its own transmitting/receiving station, and then transmits the subsequent transmission contents to the receiver via an output line 1501. In addition, if there is a transmission request signal that has a higher priority than the transmission request signal from the own transmitting/receiving station, the transmitting/receiving station automatically transmits it to the transmitting/receiving station until the transmission based on this signal is completed and a transmission end sign is issued. A transmission request stop command signal is generated via the output line 1502 so that the transmitting/receiving station temporarily stops sending out the transmission request signal.

In this way, each transmission/reception (M station can communicate in a time-division manner with a desired transmitting/receiving station using the same frequency band via transmission request signals having predetermined priorities and different code contents. It is done automatically/dynamically.

This type of transmission/reception system is based on ADA (Random Access), which allows a large number of subscribers to arbitrarily select the other party and talk to each other in order to make effective use of frequencies.
Discrete Address) method
It can also be thought of as an application to the ST voice communication system.

■In the ADA system, a carrier wave with a relatively wide frequency band is divided into several slightly different frequency domain slots and time domain slots, and an address consisting of a combination of both is used to select the C station. However, in this embodiment, priority + a is given and a different identification code is used as an address for each transmitting/receiving station, which is transmitted repeatedly in a temporally random manner.
The same communication method is used for burst voice communication. In this way: Noxt voice communication system using the LADA system (which allows each transmitting and receiving station to access any other party independently without reducing the communication capacity of the private line) can be realized.

In a random access communication network constituted by a plurality of burst voice communication devices that use the same frequency channel, the present invention provides a system in which, after one of the transmitting/receiving stations emits radio waves, the transmitting/receiving station desiring to transmit a message makes a transmission request, and In this case, when there are multiple transmitting/receiving stations making a transmission request, the basic feature is that the transmission request is made via an encoded identification code so that the desired station for communication is automatically selected. The burst communication method shown in FIG. 1 is only one embodiment of the present invention, and various modifications thereof are possible.

For example, in the embodiment shown in FIG.
As shown in the figure, an identification code expressed as a binary logical value code sequence P is used, but it is also possible to use other codes other than the binary one-shift code, such as an on/off code. It can be implemented.

FIG. 3 is a characteristic diagram of a transmission request signal based on on/off codes.

The transmission request signal shown in FIG.
i, Ill z, l113, etc. on signal Ql, Q2 . It is composed of an on/off code formed by a combination of off signals LL, R2, etc., which are formed by a time t1, t2, etc. that is sufficiently short compared to the time width of these on codes.

In this way, the on/off codes that occur randomly in time and have different random time widths cause the carrier wave to be
It can be easily generated by pulses K i'yl of temporally randomly arranged codes, such as N (Pseudo No1se, pseudo-noise) codes, in an asynchronous state.

Now, when each transmitting/receiving station wants to make a transmission request.

The on/off code shown in FIG. 3 is transmitted, and this is received and monitored via the transmission request section identification circuit 15, and the transmitted signals of other transmitting/receiving stations are transmitted at 11, 12, etc. when in the off state, that is, when not transmitting. If the received electric field does not exist, the idle line is judged to be in a so-called idle state, and the transmitting/receiving station starts transmitting, and when the above-mentioned received electric field is present, the communication line waits for several seconds and becomes idle. When to send.

Such random access means randomly generates an on-manf code for each transmitting/receiving station by a combination of an on-time and an off-time that is set sufficiently short compared to the on-time, and also reduces the time span of the on-code. By using this random signal as a transmission request signal, there is an extremely high probability that if there is a song transmission signal, this will occur at the off code, and this can be used to adjust the timing of transmission by the own transmitting and receiving station. , Therefore, the on/off code shown in Figure 2 may be configured as a carrier only.Also, the transmission request signal in Figure t'g1 may be replaced by the identification code, on/off code, etc. shown in Figures 2 and 3. In addition to this configuration, random access can also be achieved in a similar manner by setting different transmission request timings for each transmitting and receiving station in advance.

FIG. 4 is a one-device request timing chart showing the timing of a transmission request.

The timing of the transmission request is set in advance by changing the time from when a transmitting/receiving station finishes transmitting radio waves to the next transmission request for each station, thereby avoiding duplication of transmissions at the same time and achieving random access. This is what we aim to do.

Assuming that the transmission radio wave emission time of a transmitting/receiving station 81 in FIG. Set different values for each in advance. By setting in this manner, each transmitting/receiving station can communicate randomly at the same time without duplicating communication with each other.

In this case, each transmitting/receiving station has a different time So, the highest priority station and C are zero except for a predetermined system delay, and when one communication line is free, it can always be accessed in the highest priority order, and other transmitting/receiving stations Each S.

can be accessed one after another as desired, avoiding duplication. In addition, when accessing in this way, the signal used as the transmission request signal may be a code or the like that corrects the different identification contents for each transmitting and receiving station. It is clear that the transmitter 11 and the receiver 16 may include the transmitter 11 and the transmission requesting station identification circuit 15, respectively. It is a vine.

As explained above, according to the present invention, in a random access wireless communication network constituted by a plurality of burst voice transmitting/receiving stations that use the same frequency channel, after a certain burst voice transmitting/receiving station finishes transmitting radio waves, a request for sending a message is sent. By providing a means for a station to make a transmission request, and a transmission request means for automatically selecting a burst voice transmitting/receiving station to which a burst voice should be transmitted when there are a plurality of stations requesting transmission.

This has the effect of realizing a burst voice communication system that can automatically process random access operations and significantly improve the reduction in communication capacity of wireless lines.

[Brief explanation of the drawing]

Fig. g1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a transmission request signal characteristic diagram showing the characteristics of the transmitted Yasugi signal in the embodiment of Fig. 1, and Fig. 3 is a transmission request signal characteristic diagram showing the characteristics of the transmitted Yasugi signal in the embodiment of Fig. 1. FIG. 4 is a transmission request timing chart showing the timing of a transmission request. l, ~N... Transmitting/receiving station (1) ~ (N), 11.
...Transmitter, 12...Transmission request signal generation circuit, 13...Transmission/reception switch, 14...
Antenna, 15... Transmission requesting station identification circuit, 16
...Receiver, Figure 71 Figure 2 Figure 2 / Figure 3 Eye 1 -a@ -m- δO ne41211

Claims (1)

[Claims] In a burst voice communication system in which multiple transmitting/receiving stations use the same frequency channel to communicate band-compressed voice messages with arbitrary parties, the transmitting/receiving station that wishes to transmit a voice message occupies the frequency channel and performs the transmission. 1. A burst voice communication system comprising a send request means for executing a send@request and for automatically setting a send order when there are a plurality of send requests.