SU1040620A1 - Discrete information transmission system with intermediate accumulation - Google Patents

Abstract

DISCRETE INFORMATION TRANSMISSION SYSTEM WITH PROMETING ACCUMULATION, containing series-connected receiver, demodulator and decoder, as well as series-connected storage unit, coding unit i modulator and transmitter, characterized in that, in order to increase throughput, a setting unit is inserted into it a queue and a serially connected block for determining the optimal packet length, an analysis block and a read signal shaper, with the outputs of the block enqueing through the memory Lok connected to inputs of the analysis unit, and the outputs of odds shrovatel read signals are connected to the other inputs of the storage unit, the decoder output is connected to the input of an optimum length determination unit (packet .. -, Jff (P O)

Description

The invention relates to communication technology and can be used in packet switched communication networks.

A known system for transmitting discrete information comprising a receiver connected in series, a demodulator and a decoder, as well as a storage unit, a coding unit, a modulator, and a transmitter 1 are connected in series.

However, in a known system, the capacity is insufficient

The purpose of the invention is to increase the capacity of the system.

To achieve the goal, a discrete information system with intermediate accumulation containing the serially connected receiver, demodulator and decoder, as well as serially connected storage unit, coding unit, modulator and transmitter, a queuing unit and serially connected determination unit the optimal packet length, the analysis block and the read signal driver, the outputs of the enserver unit through the memory block connected to the inputs of the analysis unit, and the form outputs The world of read signals is connected to other inputs.

, the storage unit, the output of the decoder is connected to the input of the unit for determining the optimal packet length.

Figure 1 shows the structural electrical circuit of the proposed system; in fig. 2 is a schematic of the queuing block; on fig.Z. - diagram of the analysis unit; 4 shows a block for determining the optimal packet length; Fig. 5 illustrates a read signal driver.

The system contains a queuing unit 1, a storage unit 2, an analysis unit 3, a unit 4 for determining the optimal packet length, a read signal generator 5, a receiver b, a demodulator 7, a decoder 8, a coding unit 9, a modulator 10, a transmitter 11. The storage unit 2 consists of packet storage units 12-14 and an element. OR 15; the queuing block 1 consists of input blocks .16, each of which contains a buffer register 17, a decoder 18 packet durations and blocks of 19 AND elements,

The analysis unit 3 consists of the elements HE 20, the combinational circuit 21, the elements AND 22-24, waiting for the multivibrators 25; The unit 4 for determining the optimal packet length consists of the arithmetic logic unit 26 and the decoder 27 j. The block B of forming the read signals consists of an ele- le. cops And 28. and generator 29 clock ttulsov.

 The system works as follows.

At input 30, in block 1, packets are received from receivers or switching equipment 1 (not shown) for transmission over a channel. In block 1, the determination of the length of the received packet occurs.

In strict accordance with the received length K of the packet, writing is carried out to the corresponding block, for example, to the block 14 of storing packets of length K located in the storing block 2.

Consider the operation of block 1 (Fig. 2K) The packet selected for transmission over a given communication channel enters the queuing input unit 16, the buffer register 17, from the first outputs of which the information enters the decoder 18 of the packet duration. As a result, A positive potential appears from the outputs of the decoder 18. This signal indicates the length of the received packet. This signal allows the information packet to be overwritten from the buffer register 17 through the corresponding block of 19 AND elements to the storage block 2 (phi d.1). In the storage unit, the packet is recorded only in the block 14 for storing packet length K.

In blocks 12-14 memorization of dego block 2 (Fig. 1 intermediate storage of packets, with each block storing packets of only one fixed gradation (first, second, K, respectively), From the second outputs of the packet storage blocks 12-14 The second inputs of the analysis block 3 receive signals indicating that in the storage blocks 12-14 there are n-aks of the first, second K-gradation to be transmitted over the communication channel at the moment. If in what, -blocks 12 -1 no packages, no signals about the corresponding blocks t ..

At the input 31 (Fig. 1) to the receiver 6, feedback signals from the receiver. the feedback side (not shown) is received by the codogram (code combination), which is further demodulated by the demodulator 7 and through the decoder 8 service commands, where it happens -. Dit the selection of the information part of the codogram, enters block 4 of determining the optimal packet length.

One of the outputs of block 4 to the corresponding first input of block 3 analysis receives a signal that uniquely corresponds to the optimal packet length for the given transmission conditions.

Consider the operation of block 4 for determining the optimal packet length (Fig. Initial data, including information about the probability of packet distortion, is entered into the arithmetic logic unit 26, which determines the increment value at which the R value (transmission rate) becomes maximum. After of this, the resulting value, which is added to the device 26 from the initial value of the packet length and the increment obtained, is entered into the decoder 27. At one of the outputs of the decoder, a signal is produced that uniquely corresponds to noy for the packet length specified conditions gradation.

In analysis block 3, for each node of the queue structure, the control strategy is determined for the optimal packet length determined by block 4. If at the time the control is received, the decision structure, the queue is in one of the states ws, then control is taken (clg, 1i. (Unambiguously corresponding to the choice of the R, -ft packet length for optimal transmission over the communication channel of the i-th This, in turn, leads to the fact that a packet is selected whose length is most optimal for achieving the maximum transmission speed over the communication channel at a given time. The maximum transmission speed is reached when Te is in the storage unit 2 is a packet length which is optimal On for transmission over the communication channel.

The signal for selecting a packet of a certain length from the first output of the analysis unit 3 is fed to the input of the imaging unit 5 read signals.

Consider the operation of the analysis unit 3 (FIG. 3) for three gradations of length. The second input of the analysis block from the blocks 12-14 of the packet storage is received by signals c (OGD1 Od, corresponding to the fact that there are packets of 1, 2 and 3 gradations. To the first input of the analysis block, the signals b, b2 and from the output block 4 of determining the optimal packet length, each signal corresponds to a certain 1, 2 or 3 gradation of the packet. Moreover, "Xsij-yctjH b 1e2C, i.e., signals a.and b correspond to the gradation of the packet of the greatest length. From the inputs the analysis unit to the input of the combinational circuit 21 receives signals through the elements NOT 20 - the signals a are inverted , b. Based on these signals, on one of the outputs of the combinator circuit 21

y-s signal appears or matches the selection (s of the packet gradation for transmission over the communication channel

Signal with. Su or from the output of the combinational circuit through one of the elements And 22-24 starts the corresponding standby multivibrator 25, the pulse duration from the output of which corresponds to the length of the selected packet. From the inverse output of the launched standby multivibrator 25 to the input of the elements K 22 to 23 the logic zero level arrives which blocks the elements of And 22 and 23, and consequently, waiting for the multivibrator for the duration of the pulse. The signal from the direct output of the standby multivibrator 25 is fed to the corresponding output of the analysis unit 3 and then to the imaging unit 5 of the read signals. .

The shaper 5 generates a read signal, which at the corresponding output goes to the second input of the packet storage unit 14 of a selected length K. The first output of the block 14 packet, the length of which is the most optimal transmission over the communication channel at the moment, time, through the OR 15 element to the input of block 9 encoding.

Consider the operation of the read signal generator 5 (Fig. 5). In the shaper 5, the positive potential arriving at the corresponding input opens element 28 and allows the passage of clock pulses from the output of the generator 29 to the output and further to the storage unit 2. Moreover, the number of pulses is limited by the duration of the enabling signal.

In coding block 9 (Fig. 1), the information packet is encoded in several code combinations for the purpose of intermittent transmission. From the output of coding block 9, the packet is fed to the input of the modulator 10, where the binary sequence is spectrally matched to the communication channel, and through the transmitter 11 enters directly into the communication channel.

Thus, in the proposed system, the throughput is increased by selecting a packet having an optimal length at the time of transmission.

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Claims (1)

DISCRETE INFORMATION TRANSMISSION SYSTEM with intermediate Accumulation, containing in series connected receiver, demodulator and decoder, as well as in series connected storage unit, “SU” block, 1040620 encoding; a modulator and transmitter, characterized in that, in order to increase throughput, a queuing unit and a series-connected unit for determining the optimal packet length, an analysis unit and a read signal generator are introduced in series, and the outputs of the queuing unit through the storage unit are connected to the inputs of the unit analysis, and the outputs of the signal shaper with other inputs "the output of the decoder of the determination unit (reading package connected to the storage unit, connected to the input of optimal length