RU2779503C1 - Method for assessing the efficiency of information exchange of a communication network with account for information losses - Google Patents

Abstract

FIELD: communication.

SUBSTANCE: invention relates to the field of telecommunications. The technical result is achieved by measuring the following parameters after a set time interval t_set: number of packets supplied to the communication system in the block of information input apparatuses, capacity of the buffers in the block of storage apparatuses and bandwidths of the communication channels in the block of information transmission apparatuses, number of packets in the block of storage apparatuses, and productivity of the communication system in the block of information output apparatuses of the communication system. Based on the above measurements, the interval of effective operation of the communication system, the current values of the tangent of the angle of bandwidth efficiency of the communication system tgα_i and the threshold value thereof tgα_thr are calculated. tgα_i is compared with tgα_thr, and if the value of tgα_i is less than or equal to tgα_thr, measurements and calculations are stopped, and a decision is made that the communication system will operate efficiently while ensuring the acceptable level of information losses with the intensities of input traffic in the interval [γ_{in thr1}, γ_{in tgα}].

EFFECT: determined interval of input traffic whereat the communication system operates with the required information exchange efficiency, with an acceptable level of information losses characterised by the values of the tangent of the bandwidth efficiency of the communication system.

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Description

The invention relates to telecommunications, in particular to methods for assessing the information efficiency of communication systems. It can be used to create new and improve existing communication channels, switching nodes, automated control systems, local area networks, message-switched communication networks, packet-switched communication networks, including fast packet switching.

There is a method for evaluating the information efficiency of a communication system [patent RU No. 2477928, H04L 29/00, 03/20/2013, Bull. No. 8], the essence of which lies in the fact that as a universal generalized parameter that characterizes the information capabilities of the communication system and shows the degree of its proximity to the limiting capabilities for information transmission, the efficiency of information transmission (η) is used, for this they measure: the average for the selected interval time, the total amount of information located in the communication system in the block of storage devices and in the block of information transmission devices, as well as the average performance of the communication system over the same time interval; then calculate the cybernetic power (KW) of the communication system, and also measure: the capacity of the buffers of the storage unit and the throughput of the communication channels of the block of information transmission devices; then calculate the total cybernetic power of the communication system (KW _full ) and, taking into account the results obtained, determine:

- кибернетическая мощность системы связи; N - измеренное количество информационных сообщений в системе связи; G - измеренная производительность системы связи; Т - выбранный временной интервал усреднения;

- полная кибернетическая мощность системы связи; N_i - измеренные емкости каждого буфера блока запоминающих устройств;

- измеренные суммарные пропускные способности каналов связи блока устройств передачи информации для каждого элемента блока запоминающих устройств; n - количество буферов блока запоминающих устройств; s - число каналов связи блока устройств передачи информации, для обслуживания каждого i-го буфера блока запоминающих устройств.where

- cybernetic power of the communication system; N is the measured number of information messages in the communication system; G is the measured performance of the communication system; T - selected time interval of averaging;

- total cybernetic power of the communication system; N _i - measured capacity of each buffer of the storage unit;

- measured total throughput of communication channels of the block of information transmission devices for each element of the block of storage devices; n is the number of memory block buffers; s is the number of communication channels of the block of information transmission devices for servicing each i-th buffer of the block of storage devices.

The disadvantage of this method is that it does not allow to take into account changes in the intensity of input traffic when evaluating the effectiveness of the information exchange of the communication system.

There is also a method for evaluating the effectiveness of the information exchange of a communication system [patent RU 2685030, IPC H04L 29/00, 04/16/2019, Bull. No. 11], the essence of which lies in the fact that the value of the efficiency of information transmission of the communication system is determined by measuring in blocks: storage devices, information transmission devices, information output devices from the communication system, and also measure the current value of input traffic in the block of information input devices in the communication system, then, after a selected time interval, the value of the input traffic is re-measured in the block of devices for inputting information to the communication system and the value of the change in the input traffic is calculated relative to the value of the input traffic at which the first efficiency value was, its module is determined and compared with the threshold, in the case exceeding the threshold, at the current value of the input traffic, the efficiency of information transmission of the communication system is re-determined, and the efficiency of the information exchange of the communication system is evaluated based on the results of two measurements of the efficiency and input traffic.

The disadvantage of this method is that it does not allow determining the input traffic interval in which the communication system will operate with the required information exchange efficiency determined by the information transmission efficiency threshold value.

The closest in technical essence to the claimed invention is a method for evaluating the information efficiency of a communication system [patent RU No. 2571917, H04L29/00, 12/27/2015, Bull. No. 36] taken as a prototype. The essence of the prototype lies in the fact that they measure: the capacity of the buffers of the memory block and the throughput of the communication channels of the block of information transmission devices and calculate the total cybernetic power of the communication system KW _full , and also for the selected time interval sequentially measure the amount located in the memory blocks and devices transmission of the communication system, information and performance of the communication system for different values of the intensity of input traffic from γ _{inx min} to γ _{in max} with a step Δγ _in and calculate the cybernetic power of the communication system KW _i and then determine the values of the efficiency of information transmission η _i of the communication system in accordance with the expression

in this case, each efficiency value is compared with the threshold and, if

η _i ≥η _then ,

, а действия по определению КПД продолжают, пока не выполнится условие η_i≤η_пор, после чего прекращают измерения и вычисления, и принимают решение о том, что система связи будет работать эффективно при входном трафике γ_вх в интервале [γ_{вх пор1},γ_вхпор2], где γ_{вх пор2} - входной трафик, зафиксированный при выполнении неравенства

then fix the value

, and actions to determine the efficiency continue until the condition η _{i ≤η} thr is fulfilled, after which measurements and calculations are stopped, and a decision is made that the communication system will work efficiently with input traffic γ in in the interval [γ _{in thr1 ,} γ _int2 ], where γ _int2 is the input traffic recorded when the inequality

The disadvantage of the prototype is that it does not allow you to determine the interval of changes in the intensity of the input traffic, in which the communication system will work with the required efficiency of information exchange while ensuring acceptable loss of information packets (information loss).

The technical result of the proposed method is to determine the input traffic interval in which the communication system operates with the required information exchange efficiency, estimated by the information transmission efficiency values, while providing an acceptable level of information loss, characterized by the values of the tangent of the communication system bandwidth efficiency angle.

The specified technical result is achieved by the fact that in the method for evaluating the efficiency of information exchange of a communication system, taking into account information losses, based on determining the efficiency of information transmission and the tangent of the angle of band efficiency in the blocks of the communication system after a given time interval t _ass , the following are measured: the capacity of each buffer of the memory block and the total capacity of the communication channels of the block of devices for transmitting information for each element of the block of storage devices (KW _full ); the number of packets in the communication system by measuring the occupied memory cells of each memory block buffer and the performance of the communication system by measuring the occupied memory cells of each output block buffer (KW _i ); the number of incoming packets into the communication system by measuring the occupied buffer memory cells in the block of information input devices (γ _{in x i} ) and calculate the current values of the information transfer efficiency (η _i ), the effective operation interval [γ _{in pore1} , γ _{in pore 2} ], the current values of the tangent the angle of the bandwidth efficiency of the communication system (tgα _i ) of the communication system [Mezhuev AM, Pasechnikov I.I., Korennoy A.V. Analysis of the Information Network Efficiency Function and an Algorithm for Estimating Information Exchange Modes Based on Derivatives of a Generalized Index. - M: Electromagnetic waves and electronic systems, 2017. - v.22, No. 5. - P. 12-22] for the current values of the input traffic intensity γ _{in i} from γ _{in pore1} to γ _{in pore 2} , tgα _i is compared with the threshold value of the tangent of the angle of the _bandwidth efficiency of the communication system tg _por and the interval [γ _{in pore1} , γ _{in tgα} ], limited on the left by the threshold value of the efficiency of information transmission, and on the right - by the threshold value of the tangent of the angle of the band efficiency of the communication system, within which the transmission of information in the communication system is ensured with the provision of acceptable losses of information packets.

When describing a communication system, which is understood as a single-channel, multi-channel communication system, and a communication network, the concept of a communication object 1 (figure 1) is used, consisting of the main blocks:

2 - block of devices for entering information into the communication system (BUVI);

3 - block of storage devices (BZU);

4 - block of information transmission devices (BUPI);

5 - block of devices for outputting information from the communication system (BUVVI). In addition, the block diagram of the implementation of the proposed method includes blocks:

6 - block of the meter-computer of the interval of effective operation of the communication system (BIVIER);

7 - block for comparing input traffic and control (BSVTU);

8 - block measuring-calculator of the tangent of the angle of the bandwidth efficiency of the communication system (BIVTUPE);

9 - block measuring-calculator of the threshold value of the tangent of the angle of the bandwidth efficiency of the communication system (BIVPTUPE);

10 - tangent and control comparison unit (BSTU);

11 - block for fixing threshold values (BFPZ).

The essence of the invention lies in the fact that by measuring at a given time interval t _ass in blocks: information input devices, storage devices, information transmission devices, information output devices of the communication system, the effective operation interval of the communication system is determined [γ _{in pore1} , γ _{in pore 2} ], after which, for the current values of the intensity of input traffic γ _{in i} in the range from γ _{in pore1} to γ _{in pore 2} through t _set , sequential measurements are made: the number of incoming packets capabilities of communication channels in the block of information transmission devices, the number of packets in the memory block, and the performance of the communication system in the block of information output devices of the communication system, on the basis of which the current values of the tangent of the angle of the band efficiency angle of the communication system tgα _i and its threshold value tgα _then are calculated in accordance with the expression

where Δη _porIP = 0.1% - the threshold value of the increase in the efficiency of information transmission, taking into account the appearance of information losses in the communication system, Δγ int - the threshold value of the increment in the intensity of the input traffic, while each value of the tangent tgα _i is compared with the threshold tgα _{pore ,} and if

then the actions described above continue until the condition tgα _i ≤tgα _then is fulfilled, after which the measurements and calculations are stopped, the current value of the input traffic intensity γ _{in tgα} = γ _{in i} is fixed, and a decision is made that the communication system will work efficiently with the provision permissible level of information loss at intensities of input traffic in the interval [γ _{in pore1} , γ _{in tgα} ], where γ _{in tgα} is the upper limit of the interval of effective operation of the communication system at an acceptable level of information loss (figure 2).

The essence of the invention is explained as follows. Carrying out successive measurements of the current values of the intensity of the input traffic, the efficiency of information transmission and the tangent of the angle of the band efficiency of the communication system when the intensity of the input traffic changes in the interval of its effective operation (bandwidth) [Mezhuev A.M., Pasechnikov I.I. Determining the bandwidth of an information network by input traffic based on the use of the value of its cybernetic power. - Voronezh: Bulletin of the VI FSIN, No. 3, 2016. - P.22-27] allows you to determine the input traffic change interval in which the communication system operates with the required information exchange efficiency at an acceptable level of information loss by comparing the current values of the tangent of the band efficiency angle tga_i with its threshold value tgα_since (2) and determination of the upper boundary of the interval γ_{input tgα}. At the same time, to determine tgα_since (1) threshold values are used: input traffic increments Δγ_in=N_can ⋅Δγ_{in min}, where N_can - NUMBER of communication channels, Δγ_{in min} - the minimum increment in the intensity of input traffic in each communication channel is equal to 1 packet/s, selected according to a known method for evaluating the effectiveness of a communication system [patent RU 2685030, IPC H04L 29/00, 04/16/2019, Bull. No. 11]; increments of the efficiency of information transmission, taking into account the permissible information losses in the communication system Δη_{since IP}=0.1%, which is determined on the basis of modeling and evaluating the effectiveness of information exchange of communication systems with given structures [Mezhuev A.M., Pasechnikov I.I., Korennoy A.V. Analysis of the Information Network Efficiency Function and an Algorithm for Estimating Information Exchange Modes Based on Derivatives of a Generalized Index. - M.: Electromagnetic waves and electronic systems, 2017. - v.22, No. 5. - P. 12-22] taking into account the requirements for the loss of information packets specified in the recommendations of the International Telecommunication Union [ITU-T Recommendation Y.1541 Network Performance Objectives for IP-Based Services // May 2002; ITU-T Recommendation E.802 Overall network operation, telephone service, service operation and human factors // February 2007]. As a result, on the left, the bandwidth of the communication system, taking into account the permissible information losses, is limited in accordance with the specified threshold value of the efficiency of information transmission by the value of the input traffic γ_{in por1}obtained by determining the interval of effective operation of the communication system according to a known method [patent RU No. 2571917, H04L 29/00, 12/27/2015, Bull. No. 36], and on the right - γ_{input tgα}, which is determined by checking inequality (2) for the current values of the tangent of the band efficiency angle of the communication system tgα_i and is limited by its threshold value tgα_since. This achieves the technical result specified in the invention.

The method for evaluating the effectiveness of the information exchange of a communication system, taking into account information losses, is carried out as follows (figure 1). After a given time interval t_ass based on successive measurements in the blocks of the communication system: BUVI (block 2), BZU (block 3), BULI (block 4) and BUVI (block 5) determine in BIVIER (block 6) the current values of the efficiency of information transmission of the communication system η_i and compare them with the threshold η_since, resulting in a known method [patent RU No. 2571917, H04L29/00, 27.12.15 Bull. No. 36] find the interval of effective operation of the communication system according to the input traffic [γ_{in por1}, γ_vhppor2], the lower value of which is γ_{in por1} sent from the output 2 BIVIER (block 6) to the input 1 BFPZ (block 11), made for example in the form of a storage device, to store it. Boundary values of the effective operation interval of the communication system [γ_{inx nop1},γ_{vx por2}] from the output 1 of the BIVIER (block 6) is fed to the input 1 of the BSVTU (block 7), made, for example, in the form of a comparator, to compare them with the current value of the intensity of the input traffic γ_{in x i}coming from the BUVI (block 2) to the input 2 of the BSVTU block (block 7). If conditions γ_{in por1}≤γ_{in x i}≤y_{in por2} are not performed, then the control signal is not issued to the output of the BSVTU (block 7). Otherwise, at the output of the BSVTU (block 7) a control signal is generated, which is fed to the control input (control input 1) of the BIVTUPE (block 8) for measurements and calculations after a given time interval t_ass current values of the tangent of the band efficiency angle of the communication system tgα_i according to a known method [patent RU 2685030, IPC H04L29/00, 04/16/2019. Bull. No. 11] based on successive measurements through t_ass in blocks: BUVI (block 2), BZU (block 3), BUPI (block 4) and BUVVI (block 5) of the communication system. Further, from the BUPI (block 4), the counted number of communication channels N_can, and at the input 2 of the BIVPTUPE (block 9) - the threshold increase in the efficiency of information transmission, taking into account the permissible information losses in the communication system Δη_{since IP}=0.1%, where, for example, using a divider, determine the threshold value of the tangent of the angle of the band efficiency of the communication system tgα_since. Then the values of tgα_i from BIVTUPE (block 8) and tgα_since from BIVPTUPE (block 9) is sent, respectively, to the inputs 1 and 2 of the BSTU (block 10), made, for example, in the form of a comparator, for their comparison. When the condition tgα_i>tga_since at the output of the BSTU (block 10), the control signal is not issued and the measurements of the current values of the tangent tgα are continued_i. Otherwise, at the output of the BSTU (block 10) a control signal is generated, which is fed to the control input (control input) of the BFPZ (block 11) and the current value of γ is fixed_{in x i}=γ_{input tgα}, coming from the BUVI (block 2) to the input 2 of the BFPZ (block 11). Further, from the output 2 of the BFPZ (block 11), the control signal is sent to the control input (control input 2) of the BIVTUPE (block 8) to stop measurements and calculations after a given time interval t_ass current values of the tangent of the band efficiency angle of the communication system tgα_i. After that, the boundary values of the input traffic intensity interval [γ_{in por1},γ_{input tgα}]^_ the bandwidth of the communication system, taking into account the allowable information loss.

All of the above operations for implementing the method can be implemented, for example, using high-speed microcontrollers [Belov A.V. Self-instruction manual for the developer of devices on AVR microcontrollers. - S.-Pb.: Science and Technology, 2008. - 544 p.].

The difference between the proposed method and the prototype is that it provides for determining the interval of change in the intensity of the input traffic, within which the operation of the communication system is carried out with the required efficiency of information exchange, estimated by the values of the efficiency of information transmission, while ensuring an acceptable level of information loss, characterized by the values of the tangent of the angle bandwidth efficiency of the communication system.

The proof of the technical feasibility of the method for evaluating the effectiveness of the information exchange of a communication system, taking into account information losses, is that its implementation requires standard elements of microelectronics, existing measuring and computer equipment, as well as software based on standard mathematical operations.

The scope of the proposed method for assessing the information efficiency of communication systems refers to information systems, where the object of consideration is the processes of receiving, storing and transmitting information both within the system and issuing it to users connected to its output.

Claims (5)

A method for evaluating the effectiveness of information exchange of a communication system, taking into account information losses, which consists in determining the interval of effective operation of the communication system [γ _{in pore1} , γ _{in pore 2} ] by measuring at a given time interval t _ass in blocks: information input devices, storage devices, information transmission devices , information output devices of the communication system, characterized in that for the current values of the input traffic intensity γ _{in i} in the range from γ _{in pore1} to γ _{in pore 2} through t _set , sequential measurements are made: the number of incoming packets into the communication system in the block of information input devices, capacity buffers in the block of storage devices and throughput of communication channels in the block of information transmission devices, the number of packets in the block of storage devices, and the performance of the communication system in the block of information output devices of the communication system, on the basis of which the current values of the tangent of the angle of the band efficiency of the system are calculated tgα _i and its threshold value tgα _then according to the expression

where Δη thr _IP = 0.1% - the threshold value of the increase in the efficiency of information transmission, taking into account the appearance of information losses in the communication system, Δγ in thr - the threshold value of the increment in the intensity of the input traffic, while each value of the tangent _{tgα i} is compared with the threshold _tgα thr , and if

then the actions described above continue until the condition tgα _i ≤tgα _then is fulfilled, after which the measurements and calculations are stopped, the current value of the input traffic intensity γ _{in tgα} = γ _{in i} is fixed, and a decision is made that the communication system will work efficiently with an acceptable the level of information loss at intensities of input traffic in the interval [γ _{in pore1} , γ _{in tgα} ], where γ _{in tgα} is the upper limit of the effective operation interval of the communication system at an acceptable level of information loss.

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