SU1727143A1 - Device for transmission of information - Google Patents

Abstract

The invention relates to automation and computing and can be used in devices for transmitting information from stations operating on an asynchronous principle in one communication channel. The aim of the invention is to increase the informational flexibility of the device. The device contains a receiving-transmitting unit 1, a unit 2 for analyzing channel occupancy, blocks 3, 14, 15. 18.20 delay, trigger 4, blocks 5, 4, 10-12, information dispensers 6.8, elements HI: 7, 23, elements OR 9, 13. 21, random number generator 16, decoder 17. The device reduces the probability of signal overlap, increases the likelihood of capturing the communication channel and improves access control to the free channel during the first transmission of a packet of information. 1 il.

Description

The invention relates to automation and computing and can be used in devices for transmitting information from stations operating on an asynchronous principle in one communication channel.

Apparatus for transmitting information used in systems having a large number of stations operating in one communication channel are known.

 However, these hp devices take into account the possibility of overlapping signals from several stations awaiting channel release.

The closest in technical essence to the present invention is an information transmission device comprising a priority level determination unit, a key, a switch. receiving-transmitting unit, block determining the channel occupancy, first to ninth elements AND, first to ninth

the delay elements, the first and second elements OR generator.

The device operation algorithm does not reduce the likelihood of signal overlap in the deadband.

In tp + triK + tan.

where tp is the signal propagation time from one station to another;

1 pc is the time of switching the station from the Reception to the Transmission mode;

tan is the time of analysis of the received identification information.

All stations monitor the common link, refraining from transmitting the finished packets while busy. When a channel is released, the stations that are ready to transmit before sending a packet of information send a busy signal. However, due to the presence of an insensitivity interval, it is possible to overlap the busy signals, which leads to a decrease in effect

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the ability to capture a common channel and, in general, an increase in the transmission cycle time.

The purpose of the invention is to increase the informational flexibility of the device by reducing the likelihood of station signal overlapping in one communication channel.

This goal is achieved by the fact that in the device containing the receiving-transmitting unit connected at the input to the terminal, the output of the receiving and transmitting unit is connected to the channel occupancy analysis unit and the first delay unit, whose outputs are connected to the corresponding trigger inputs, additionally introduced the first distributor pulses connected to the input of the first output of the trigger, with the input of the first element And the input of the first element NOT, the outputs of the first distributor of pulses are connected respectively to the inputs of the second, third and even And, the second inputs of which are connected to the corresponding outputs of the second pulse distributor, whose input is connected to the output of the first element NOT, and to the inputs of the first element OR, the output of which is connected to the input of the second element OR, which is connected to the input of the second element OR, whose output connected to the second input of the receiving and transmitting unit, the second input of the second element OR is connected to the output of the first element AND, the second input of which is connected to the output of the third element OR, the corresponding inputs of which о are connected to the second, third and fourth delay blocks, the inputs of which are connected to the corresponding outputs of the decoder, the input of which is connected to the output of the random number generator, the input of which is connected to the output of the fourth OR element. the first input of which is connected to the output of the second element I. and the second and third inputs respectively through the fifth and sixth delay blocks to the outputs of the third and fourth elements I.

The main difference between the proposed device and the prototype lies in the fact that the introduction of a random number generator with pulse distributors, a decoder, AND elements. OR, NOT and delay blocks reduced the probability of signal overlap caused by the deadband, and improved access control to common channel when the first packet of information is transmitted.

The drawing shows a block diagram of the proposed device.

The device contains — a receiving-transmitting unit 1, a unit 2 for analyzing a channel occupancy, a first block 3 for a delay, a trigger 4,

the first element And 5, the first distributor b of information, the first element NOT 7 ,. second information dispenser 8, first element OR 9, second to fourth elements AND 10-12, fourth element OR 13. fifth and sixth blocks 14 and 15 delays, 16 random numbers generator, decoder 17, second to fourth blocks 18-20 delays , third element OR 21, second element

0 OR 22, the second element is NOT 23.

The device works as follows.

When the terminal accumulates the amount of information necessary to transmit,

5, also when a free channel is used and when the common channel access algorithm is executed in the deadband, a permitting potential, which passes into the receiving and transmitting unit 1, is established at the second input of the receiving and transmitting unit 1, switching it to transmission mode. Information from the terminal device through the receiving-transmitting unit 1 enters the communication channel.

5 In the receive mode, the information signals of other stations from the communication channel through the receiving and transmitting unit 1 are received in the block 2 analysis of channel occupancy. After determining whether the communication channel is busy

0, the busy analysis unit 2 sets the trigger 4 to the zero state, prohibiting the device from entering the transfer mode. Trigger 4 returns to its original position after a time determined by the delay.

5 of the falling edge of the received pulses, which is performed by the first block 3 of the delay. The magnitude of this delay is chosen greater than the maximum duration of pauses between the pulses of the transmitted sequences.

If at the time the packet is formed in the terminal, the communication channel is free, then the signal from the output of trigger 4 along the circuit: the first element is NOT 7, the second is the distributor of 8 pulses, the first element is OR 9,. the second element is NOT 23, the second element OR 22 is fed to the second input of the receiving and transmitting unit 1, thereby permitting the transfer of the receiving and transmitting unit 1 to

0 transfer mode. Information from the terminal is received through the receiving-transmitting unit 1 to the communication channel.

In the event that the communication channel is locked by other stations, the device will track this channel until it is released. In this case, if the device has a packet of information ready for transmission, then as a result of the first attempt to access the occupied communication channel, the signal from the output of the trigger 4 through the first element NOT 7 will come in the form

units to the first output of the second distributor 8 pulses, where it will be fixed until the next attempt at circulation.

After releasing the communication channel, the unit signal from the output of the trigger 4 acts on the first element 5 and the first distributor 6 pulses, from the first output of which the signal recorded on it before the next attempt to access will go to the first input of the second element 10. the output of the second distributor 8 pulses the signal from the output of the second element AND 10 through the fourth element OR 13 will turn on the generator of 16 random numbers. The random number generated corresponds to a delay equal to this number multiplied by the insensitivity interval. The random delay is determined by a second, third, or fourth delay block 18, 19, 20. Consequently, the signal from the generator of 16 random numbers through the decoder 17, one of the blocks 18,19,20 delay through the third element IL 21 And arrive at the input of the first element AND 5. If by this time the communication channel is still unoccupied, t . At the first input of the first element And 5 there is a resolving potential, then the signal from the output of this element through the second element OR 22 will cause the receiving-transmitting unit 1 to switch to the information packet transmission mode.

Otherwise / when permitting potential at the first input of the first element. And 5 is absent, i.e. the communication channel is occupied by the station, which has a smaller random delay, begins the second attempt to transmit the finished packet of information. In this case, the signal from the output of the trigger 4 through the first element NOT 7 will go to the second output of the second distributor 8 pulses, where it will lock up to the third attempt to access the occupied channel.

When the communication channel is released, the signal of the unit from the trigger A will go to the second output of the first distributor 6. Pulses, where it will also be fixed until a possible third attempt is made to access the channel. Since at the second input of the third element And 11 there is a resolving potential, the signal unit from the second output of the first distributor 6 pulses through the third element And 11 enters the fifth delay unit 14 and then through the fourth element IL And 13 turns on the generator 16 random Numbers The operation of the generator of 16 random numbers and the subsequent elements of the circuit is similar to the first attempt of the device to access a busy communication channel.

If, in this case, the communication channel again appears occupied by another station involved in the conflict, then the signal of the unit is fixed at the third output of the second distributor of 8 pulses. When the communication channel is released, the unit signal is fixed at the third output of the first distributor 6 pulses, which through the fourth element 12, the sixth block 15 10 delay, the fourth element OR 13 will turn on the generator 16 random numbers. After a randomly selected delay interval and the absence of a signal for channel occupancy, the receiving and transmitting of the 15th unit 1 will switch and then transfer information over the communication channel.

The delay interval of the nth delay block 14 is chosen less than that of the sixth delay block 15. Thereby

An extension of the random number selection area with increasing quantities; communication calls, which further reduces the likelihood of signal overlap due to the insensitivity interval and further increases the likelihood of a link being captured. When the device first accesses the free channel, there are no delays in switching the receiving-transmitting unit 1 and transmitting information.

Thus, the proposed device is due to the introduction of a random number generator, pulse distributors, decoder, AND, OR elements. NOT and blocks

5, the delay reduces the likelihood of signal overlap, increases the likelihood of capturing the communication channel, and improves access control to the free channel during the first transmission of a packet of information.

0 Ф орм ул а и з о б р ё т ен

A device for transmitting information, comprising a receiving-transmitting unit, the output of which is connected respectively through a channel occupancy determination unit and

5, the first delay unit to the first and second inputs of the trigger, the elements And, the outputs of the first and second elements And are connected respectively through the second and third blocks. delays with the first and second inputs of the first OR element, the generator, the fourth, fifth, sixth blocks of the delay, the outputs of which are connected respectively to the same inputs of the second OR element, so that

5 increase the informational flexibility of the device, impulse distributors, NOT elements, the third and fourth elements of the OR are entered into it, the decoder, whose outputs are connected respectively to the inputs of the fourth, fifth, sixth delay blocks, the trigger output is connected to the first input of the third element, And, to the input of the first pulse distributor and through the first element NOT to the input of the second pulse distributor, the first, second and third outputs of which are connected to the same inputs of the third OR element and the first inputs of the corresponding first, second and second elements And, the second inputs of which are connected to the corresponding, first outputs of the first pulse distributor, the output of the fourth element And

connected to the third input of the first element OR, the output of which is through a generator. pa connected to the input of the decoder, the output of the second element OR is connected to the second input of the third element AND whose output is connected to the first input of the fourth element OR whose output is connected to the first input of the transceiver, the output of the third element OR is connected through the second element NOT to the second input of the fourth element OR, the second input of the transceiver is the input of the device.

Claims (1)

Formula A device for transmitting information containing a transmitting and receiving unit, the output of which is connected respectively through the channel occupancy determination unit and the first delay unit to the first and second trigger inputs, elements And, the outputs of the first and second elements And are connected respectively through the second and third blocks. delays with the first and second inputs of the first OR element, generator, fourth, fifth, sixth delay blocks, the outputs of which are connected respectively with the same inputs of the second OR element, characterized in that, for the purpose of 'convenience', pulse distributors, elements are introduced into it NOT, the third and fourth elements OR, a decoder, the outputs of which are connected respectively to the inputs of the fourth, fifth, sixth blocks for 1727143 Ί hold, the trigger output is connected to the first input of the third AND element, the input of the first pulse distributor and through the first element NOT to the input of the second pulse distributor, the first, second and 5 third outputs of which are connected to the inputs of the third OR element and the first inputs of the fourth, the first and second elements AND, the second inputs of which are connected to the corresponding. With the 10 outputs of the first pulse distributor, the output of the fourth AND element is connected to the third input of the first OR element, the output of which through the generator is connected to the input of the decoder, the output of the second OR element is connected to the second input of the third AND element, the output of which is connected to the first input of the fourth OR element, the output of which is connected to the first input of the transceiver, the output of the third OR element is connected through the second element NOT to the second input of the fourth OR element, the second input of the transceiver is the input royals.