RU1790036C - Device for control over data transmission over radio channel - Google Patents

Abstract

The invention relates to data transmission techniques and can be used in the construction of information-calculation .-; : - 2. . Broadcast packet radio networks. The purpose of the invention is to increase the reliability of the device by monitoring the operability of the equipment of the next subscriber in turn. The device contains the first and second counters 1, 2, trigger 3, the first, second and third elements AND, the first and second elements OR 7, 8, the clock generator 9, the first and second one-shots 10, 11. If the device fails, the next in order to obtain the right to transfer, the device imitates its transmission and the network’s overall performance is not impaired. 2 ill.

Description

The invention relates to a data transmission technique and can be used in the construction of computer networks based on broadcast packet radio communications.

The purpose of the invention is to increase the reliability of the device by monitoring the operability of the equipment of the next subscriber, j:

In FIG. 1 is a structural electrical diagram of a device for yrrpf data transmission; in FIG. 2 - time diagrams explaining it

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The device for controlling data transmission over the radio channel contains the first and second counters 1, 2, trigger 3, the first and second and third elements AND, 4, 5, 6, the first and second elements OR 7, 8, the clock generator 9, the first and the second one is vibrators 10, 11.

A device for controlling the transmission of data over the air operates as follows. ::,. : -. . . ... In the initial state, trigger 3 and sensor 2 are reset in counter 1. From the code number i (i O.N) of the device in the network (yctaHpBKH circuit to the initial state) in FIG. 1 are not shown). The device numbers on the network are not repeated. When the channel is occupied (in the general Case by another device), a single signal will appear at the input of the carrier device, along the front frame: the last: counter state will decrease by one. In all other network devices, the same thing will happen, but in counters 1 is still

there will be different codes. In order to transmit information, the subscriber sets a single signal at the input of the device request

He expects to put him the right to transmit information. Consider the operation of one of the network devices. Let a single signal be present at its input request at the current moment of time, and a two-digit code is stored in the counter (see Fig. 2a). When the next single signal appears at the input of the carrier, which testifies to the transmission in the channel, the state of counter 1 decreases to unity along its leading edge, e: the result is a single signal at the output of OR 9. At the end of the occupation, the channel at the input of the carrier device disappears, a single signal at the output of the AND element 5 is displayed. A single signal from the output of element And 5 will go to the input of the generator 9 clock pulses, which will begin to form on

its output is a sequence of pulses, the number of which will be counted by counter 2. The next time the medium is taken, according to

the leading edge of a single signal at the input of the carrier device the state of the counter 1 will become zero, the element And 5 will close and the generator 9 will stop forming

pulses, and counter 2 is reset. On the trailing edge of a single signal at the input of the carrier device at the output of the And 6 element, a single signal is visible. At its leading edge, the And 6 element is blocked, and

single vibrator 10 will form a single

the pulse that will come through the OR element 7 to the output of the device control (the transmitter will be turned on by this signal) and Through the open AND 4 element to the unit

trigger input 3 and translates it into a single state. A single signal from the output of trigger 3 will go to the output of the transmission enable and the subscriber will begin to transmit information. As a result of turning on the own transmitter at the input of the carrier device, a single signal appears on the leading edge of which the state of counter 1 will change from zero to (N - 1) -th (since counter 1 is cyclic) and a single signal will disappear from the output of element And 6 . As a result of changing the state of the counter T by

unit I71and 8 will disappear.

 After the transfer of information, the subscriber

removes a single signal from the input

and trigger 3 will transition to its zero state. On the main gate; controlling the transmitter to turn on the device, a single system will disappear and the transmitter will turn off. As a result, a trailing edge of unity

no carrier signal

devices. If the subscriber does not need to transmit information before transferring the right to transmit information (reset counter 1), then

input 13 would have a zero signal. Therefore, when the counter T is zeroed, at the output of the element 1/1 6, a single signal appears along the leading edge of which

single-shot unit TO forms a single

the pulse that passes through the element OR 7 and turns on the transmitter, because at the input 13 of the device there is a zero signal, then the pulse generated by the single-shot 10 will not pass through the closed element

And 4 to the single input of trigger 3 and it will remain in the zero state. As a result, the transmitter will turn on.

only for a time equal to the duration of the pulse generated by a single vibrator

YU.

Thus, the proposed device, when granting the right to transmit, transmits either information (if there is a need for this subscriber) or a short pulse - only the carrier is transmitted.

If the unit code is stored in counter 1 after the next channel occupation (see fin 2 b), the device starts monitoring the time interval during which the channel remains unoccupied. Because in this case, at the output of the OR 8 element, a single signal will be present, then after the channel is finished (zero at the input of the carrier), a single signal will be generated at the output of the And 5 element and the clock generator will begin to generate a sequence at its output, the number of which counter 2 will count, If a period of non-availability of the control time channel is exceeded, a single signal will be generated at the output of counter 2, This signal will be sent to

the input of the OR element 8 and at its input and, accordingly, at the output of the AND element 5, single signals will disappear. The generator 9 will cease to form at its output

clock pulses and the counter will not change its state. At the same time, a single signal from the output of the counter 2 will go to the input of the single-shot 11 and at its leading edge the latter will form

a single pulse that passes through the OR element 7 to the control output of turning on the transmitter of the device and turns on the transmitter during its duration. As a result, the input carrier

a single pulse occurs, according to which counter 1 will change its state and counter 2 will be reset to zero.

Claims (1)

SUMMARY OF THE INVENTION A device for controlling data transmission over a radio channel, comprising the first and second ML elements, a single vibrator and a first counter, a first AND element and a trigger, whose input is connected to the first input of the first AND element and is the request input of the device whose carrier input is there is a counting input of the first counter, in the output of the highest bits of which are connected to the group of the first inputs of the second OR element, while the output of the one-shot is connected to the second inputs of the nerve OR element and the first AND element, turn is connected to a single input of the flip-flop, whose output is vyhodoyrazresheni transmission device and connected to the first input of the first OR gate, the output of which is the output control transmitter switching device on tlychayusche e in that in order to increase the reliability device operation by monitoring the operability of the next the queue of the subscriber, the second and third AND elements are introduced, a clock pulse generator, a second counter and a second one-shot, the output of which is connected to the third input of the first OR element, while the input of the first counter is connected to the reset input of the second counter and the first inputs of the second and third elements I / I, and the low-order output of the first counter is connected to the second input of the third element And, the output of which is connected to the input of the first one-shot and the second input of the second element And, the output of which through the clock generator is connected to the counting input of the counter, output which is connected to the input of the second single-vibrator and the second input of the second OR element, the output of which is connected to the third inputs of the second and third elements I.