RU2142647C1 - Model of radio communication system - Google Patents

Abstract

FIELD: computer engineering. SUBSTANCE: device has call generator, four AND gates, three OR gates, random pulse flow detector, reverse counter, two NOT gates, clock oscillator, delay gate, and high-priority call generator. EFFECT: increased precision of model due to simulation of mode for servicing incoming calls from users with standard and high priority and allocation of channel for high- priority call in cases, when all channels are busy. 1 dwg

Description

 The invention relates to specialized means of computer technology and can be used to simulate a radio communication system operating in the mode of unsecured channels (in the mode of a radio-telephone exchange).

 A device for modeling a communication system containing two counters, a pulse generator, a display panel and series-connected random pulse stream generator, an element He and an element And [1].

 However, this device does not provide the ability to simulate the operation of a radio communication system with the receipt and maintenance of applications with priority.

 Closest to the proposed technical essence is a device for modeling communication systems, containing a generator of applications, two AND elements, an OR element, a reversible counter, and an element NOT, with the second input of the first element AND connected to the output of the element NOT [2].

 The disadvantage of this device is that it does not allow you to simulate in the radio communication system with unsecured channels (in the radio-PBX) the mode of receipt and service of applications with priority.

 The purpose of the invention is to increase the accuracy of modeling the device by reproducing the mode of receipt and servicing of requests from subscribers with priority and without priority with the release of the channel for the application with priority if all channels are busy.

 This goal is achieved by the fact that in a device for modeling communication systems containing an application generator, two AND elements, an OR element, a reversible counter and an NOT element, the output of the application generator being connected to the first input of the first AND element, the second input of which is connected to the output of the first element NOT, two AND elements are introduced, a random pulse flow sensor, a clock generator, a NOT element, two OR elements, a delay element and a priority request generator, wherein the output of the first AND element is connected to the first input of the second element that OR, whose output is the summing input of a reversible counter, the bit outputs of which are connected respectively to the inputs of the first OR element and through the second AND element to the input of the first element NOT and to the second input of the fourth AND element, the output of the first OR element is connected to the first input of the third AND element the second input of which is connected to the output of the clock generator, the output of the third AND element is connected to the input of the random pulse flow sensor, the output of which is connected to the first input of the third OR element, whose course is the subtracting input of the reversible counter, the output of the priority claim generator is connected to the first input of the fourth AND element, the input of the second element NOT and the input of the second element NOT and the input of the delay element, the output of which is connected to the second input of the second OR element, the output of the second element is NOT connected to the third input of the first AND element, the output of the fourth AND element is connected to the second input of the third OR element.

 It is known that radio communication systems with non-fixed channels are mainly constructed as communication systems with relaying signals (for example, as satellite communication systems [3], [4]). Moreover, in such a radio communication system there may be subscribers with different priorities. The discipline for servicing priority subscribers can be different, in particular, when a request is received from a subscriber with a priority, requests from subscribers without a priority are blocked and, if all channels are busy, the information exchange for a certain request is forcibly completed and the channel freed up as a result is issued for servicing the application with priority. Taking this factor into account is important at the stage of designing radio communication systems, which determines the importance of introducing such a regime into the proposed device.

 Due to the fact that the proposed device has distinctive features from the prototype, it meets the criterion of "novelty."

 The distinguishing features introduced — a random pulse flow sensor, AND elements, an NOT element, an OR element, a delay element, a priority claim generator, and a clock pulse generator — are also found in other analogs, however, they serve other purposes there. The introduction of the above distinctive features can significantly improve the accuracy of the simulation of the device, therefore, the claimed device meets the criterion of "significant difference".

 The random flow sensor is known and described in [5].

 The delay element is known and similar to the delay element in [6].

 The priority application generator is made similarly to the application generator in [2].

 The drawing shows a structural diagram of the proposed device for modeling a radio communication system.

The drawing indicates:
1 - generator of priority applications;
2 - application generator;
3, 4 - respectively, the first and second elements are NOT;
5, 6, 7, 8 - respectively, the first, second, third and fourth elements of And;
9 - reverse counter;
10, 11, 12 - respectively, the first, second and third elements OR;
13 - delay element;
14 - clock generator;
15 - sensor random flow of pulses.

 The present invention contains a generator of 1 priority applications, a generator of 2 applications, the first 3 and second 4 elements NOT, the first 5, second 6, third 7 and fourth 8 element AND, a reversible counter 9, first 10, second 11 and third 12 elements OR, element 13 delays, a clock generator 14 and a random pulse stream sensor 15, and the output of the 2 application generator is connected to the first input of the first 5 AND element, the output of which is connected to the first input of the second 11 OR element, the output of which is a summing input of the reverse counter 9, bit the outputs of which are connected respectively to the inputs of the first 10 element OR and through the second 6 element AND with the second input of the fourth 8 element AND and the input of the first 3 element NOT, the output of which is connected to the second input of the first 5 element AND, the output of the first 10 element OR is connected to the first the input of the third 7 And element, the second input of which is connected to the output of the generator 14 clock pulses, the output of the third 7 element And is connected to the input of the sensor 15 of a random pulse stream, the output of which is connected to the first input of the third 12 element OR, the output of which is the subtracting input of the reverse counter 9, the output of the priority generator 1 is connected to the first input of the fourth 8 AND element, the input of the second 4 NOT element and the input of the delay element 13, the output of which is connected to the second input of the second 11 OR element, the output of the second 4 element is NOT connected with the third input of the first 5 AND element, the output of the fourth 8 AND element is connected to the second input of the third 12 OR element.

 A device for modeling a radio communication system operates as follows.

 In a radio communication system with loose channels there are N working channels, each of which can be activated upon request for information exchange of one subscriber with another. The total number of working channels in the radio communication system in the device is determined by the capacity of the reverse counter 9.

 Consider three situations that may occur in a simulated radio communication system.

 Situation 1. In the radio communication system there is at least one free working communication channel. At the input of the system comes a connection request without priority. An incoming request arrives for service.

 Situation 2. In the radio communication system there is at least one free working communication channel. The system receives requests for connection from the subscriber with priority and the subscriber without priority. A connection request from a subscriber without priority is blocked and is not received for service. A connection request from a subscriber with priority is received for service.

 Situation 3. There are no free communication channels in the radio communication system. At the input of the system, connection requests from subscribers come with both priority and without priority. A connection request from priority subscribers clears the channel for itself and arrives at the service. A request from a subscriber without a priority for service is not received and is lost.

 In the initial state, the contents of the counter 9 is zero.

In situation 1, the invention works like this. The number of occupied working radio channels in the system is displayed by a binary number and a reverse counter 9. Moreover, the direct outputs of counter 9 corresponding to a given number have a logical level of “1”, since there are occupied radio channels. Since there are free radio channels, the output 6 of the And element and the second input 8 of the And element will have a logical level of "0", and accordingly, the second input 5 of the And element will have a logical level of "1". Since requests from priority subscribers are not received, it means that at the output of the generator 1 priority applications and at the first input of element 8 there will be a logic level “0”, and at the output of 4 elements NOT and, accordingly, at the third input 5 of element And there will be a level logical "1". Thus, the received connection request will go through the open elements 5 and 11 and will go to the summing input of the reverse counter 9, the value of which will increase by one, which simulates the occupation of another working radio channel
Modeling the process of servicing applications is as follows.

 The clock generator 14 through the open element 7 And (element 7 will be open if there is at least one occupied radio channel) issues pulses to the input of the sensor 15, the first incoming pulse triggers the sensor 15, and subsequent clock pulses ensure its operation. Through a random number of pulses proportional to the service time of the incoming connection request, the random flow sensor 15 will generate a pulse at its output, which indicates that the service has been completed and one of the occupied radio communication channels has become free. This pulse is fed to the subtracting input of the reverse counter 9, and the contents of the latter will decrease by one. Thus, the release of one busy working radio channel.

 We also note that the process of servicing occupied radio channels is carried out according to the algorithm described above even in the absence of a new incoming connection request.

 In situation 2, the proposed device works like this. The pulse from the output of the generator 1 of priority requests is simultaneously transmitted to the input 4 of the element NOT, the input of the delay element 13 and to the first input of the 8 element I. Since there are free radio channels, then the second input of the 5 element And will be the logical level “1”, and at second input 8 of the AND element will be a logical level of "0". So element 8 will be closed. At the output 4 of the element, a logical "0" will not be formed, which will close element 5 and thereby block the generator of 2 applications. Therefore, applications from subscribers without priority that will come after this will be lost until the incoming application from the priority subscriber arrives for service. The pulse from the output of the delay element 13 through the 11th OR element will go to the summing input of the reverse counter 9, which simulates the occupation of another free radio channel.

 In this case, in the radio communication system, the simulation of the service mode of the occupied radio channels will be as described above.

 In situation 3, the proposed device works like this. Since all channels are occupied in the radio communication system, then the output 6 of the And element and the second input 8 of the And element will have a logical level of "1", and at the second input 5 of the And element a logical "0" will be formed, which will "close" the element 5, so thereby blocking the generator of 2 applications. Therefore, all applications from subscribers without priority will be lost until any radio channel is released. The pulse from the output of the generator 1 of priority requests will go to the input of the delay element 13, to the input of the 4 elements NOT and through the open elements 8 and 12 to the subtracting input of the reverse counter 9, which simulates the forced release of one occupied radio communication channel (in reality, only the channels are forcibly released, occupied by subscribers without priority, but the proposed device cannot recognize who the channel is busy with, and frees the first one it gets). The pulse delayed by the delay element 13 for the time required to clean the channel, through the open element 11 will go to the summing input of the reversing counter 9, which simulates the occupation of the released radio channel.

 In this case, in the radio communication system, the simulation of the service mode of the occupied radio channels will be as described above.

 By connecting various calculating devices to the corresponding elements of this device for modeling a radio communication system, one can obtain numerical characteristics of the quality of service for subscribers of a radio communication system with non-fixed channels.

 The advantage of the proposed device for modeling a radio communication system is the ability to simulate the mode of receipt and service of applications and high and low priority at a relatively low cost of element base. Such modeling of radio communication systems at the design stage allows to reduce development time while reducing the cost of the work itself.

Sources of information taken into account:
1. A.S. (USSR) N 842827, MKI5 G 06 F 15/20. Device for modeling a communication system, 1979.

 2. A. p. (USSR) N 1397935, MKI5 G 06 F 15/20. Device for modeling a communication system, 1986 (prototype).

 3. Fortushenko A.D. and others. "Fundamentals of building satellite communications systems", M: Sov. Radio, 1972.

 4. Ed. L.Ya. Kantora "Handbook of satellite communications and broadcasting", M: Radio and communications, 1983.

 5. A. S. (USSR) N 1370736, MKI5 H 03 K 3/84. Random Flow Sensor, 1986.

 6. A.S. (USSR) N 1339877, MKI5 H 03 K 4/02. Sawtooth current generator.

Claims (1)

 A device for modeling a radio communication system containing a generator of claims, two AND elements, an OR element, a reverse counter and a NOT element, the output of the generator of applications being connected to the first input of the first AND element, the second input of which is connected to the output of the first NOT element, characterized in that it introduced two AND elements, a random pulse flow sensor, a clock generator, a NOT element, two OR elements, a delay element and a priority request generator, and the output of the first AND element is connected to the first input of the second electronic OR, the output of which is the summing input of a reversible counter, the bit outputs of which are connected respectively to the inputs of the first OR element and through the second AND element to the input of the first NOT element and to the second input of the fourth AND element, the output of the first OR element is connected to the first input of the third element And, the second input of which is connected to the output of the clock generator, the output of the third element And is connected to the input of the random pulse flow sensor, the output of which is connected to the first input of the third element And LI, the output of which is the subtracting input of the reversible counter, the output of the priority claim generator is connected to the first input of the fourth AND element, the input of the second element NOT and the input of the delay element, the output of which is connected to the second input of the second OR element, the output of the second element is NOT connected to the third input of the first AND element, the output of the fourth AND element is connected to the second input of the third OR element.