DE1266826B - Traffic measurement method for telecommunication, in particular telephone switching systems - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

H04m

German class: 21 a3- 66/10

Number: 1266 826

File number: S 88742 VIII a / 21 a3

Filing date: December 16, 1963

Opening day: April 25, 1968

The main patent relates to traffic measurement methods for telecommunications, in particular telephone switching systems, where centrally stored information about the participation of participants on connections as well as their operating status when handling connection processes become, such as B. in systems operating on the time division multiplex principle for the periodic repeated brief interconnection of the participants involved in connections. With these Traffic measurement methods are the information assigned to the participants according to their number under Taking into account their peculiarity monitored in time with the help of counting devices in such a way that the received counting results form traffic measurement values for the switching system.

According to the main patent, various traffic measurements can be made with the aid of these traffic measurement methods the utilization of connection channels, the occupancy cases that occur, the affect outgoing assignments and similar processes.

The invention now shows a way of how one can use this traffic measurement method can gain further traffic measurement. This traffic metric is advantageous, among other things but can be used to provide clues for the number and size of the various to one Switching system belonging facilities to win.

The invention thus relates to a traffic measurement method for telecommunications, in particular telephone switching systems, in which information assigned to the subscribers and centrally stored information is used to handle switching processes, which information is monitored with the help of counting devices in such a way that the counting results obtained form traffic measurements for the switching system, according to the patent 1333 437. This traffic measurement method is characterized in that that time span is determined which elapses from the lifting of a handset by a subscriber with outgoing traffic to the onset of the dial tone, in that the time span is measured during the commands for the allocation of a connection path from his subscriber circuit to occur to a device delivering the dial tone, with whose allocation the dial tone begins, and that for the sole consideration of the period of time which the subscriber allows to elapse in the case in which he of an allocation d The handset hangs up again, the measurement of the time span is deleted again if traffic measurement methods for telecommunications,
in particular telephone switching systems

Addendum to the patent: 1133 437

Applicant:

Siemens Aktiengesellschaft, Berlin and Munich, 8000 Munich 2, Wittelsbacherplatz 2

Named as inventor:

Dipl.-Ing. Dieter Voegtlen, 8130 Starnberg -

ao in the case in question an allocation actually takes place.

In the relevant literature (see, for example, "Siemens Zeitschrift", 35, 1961/7, pp. 511 to 514 and "Telecommunications Journal", 14, 1961, 4,

Pp. 179 to 182) various traffic measurement methods are described. The above marked is not included, however, nor is it any indication of the manner in which this traffic measurement method is used is carried out in detail.

An example of the application of the traffic measurement method according to the invention is given with reference to FIGS. 1 explains in more detail, which shows the structure of a telephone switching system with a so-called time path multiple, i.e. a time division multiplex switching system, to the extent that the associated sub-devices of the switching system are of interest here. Counting devices connected there are also shown.
FIG. 2 shows details of the structure of one of the counting devices that may be used.

To facilitate understanding of how to obtain traffic metrics according to the invention are, the sub-devices of the switching system shown are first explained, as far as it matters here.

In such a switching system, those to be exchanged by the respective subscribers Messages pulse trains are modulated, which are offset from one another and thus a Allow multiple use of connection paths. The participants in this switching system are

809 540/64

merstations TnI ... Tn χ connected via the subscriber circuits Π ... Tx , wherein the subscriber circuits can be connected to the speech multiplex line SM via speech switches Sl ... Sx to be controlled. The speech switches are controlled by control pulses, which are supplied with the help of the circulating memory Ua and Ub. The call numbers of subscribers with outgoing traffic run in coded form in the circular memory Ua and the call numbers of subscribers with incoming traffic in a corresponding manner in the circular memory Ub. Call numbers in coded form are referred to below as addresses. The addresses belonging to a connection each have the same circular phase and are therefore output at the same time at the outputs of the circular memory. So-called decoders Da and Db are connected to the outputs of the circulating memory. Each decoder has as many outputs as there are subscribers. Each of these outputs is assigned to a specific participant. Each speech switch is now connected both to an output of the decoder Da and to an output of the decoder Db . If the address of a subscriber is fed to a decoder, a pulse is emitted at the output assigned to this subscriber. This impulse is used to control the speech switch assigned to the respective participant. If at the same time a pulse occurs at the outputs assigned to two different subscribers at the two decoders, the speech switches belonging to these two subscribers are temporarily closed, whereby these two subscribers are connected to one another via the voice multiplex line SM during this time. This repeats itself periodically with the circulation period of the addresses circulating in the circulating memories. This creates the intended connection between the participants concerned.

In addition to the devices already described, the receiving device MM is also present, which is connected to the speech multiplex line SM and is used to record the call numbers possibly supplied by subscribers, which they then pass on to the circular memory Ub . The address register G is also provided. Among other things, it delivers the addresses of the subscribers one after the other, with the aid of which the subscriber circuits are queried for their operating status, that is to say whether the receiver at the associated subscriber station is lifted or hung up.

The central control device E, which is used to control the various switching processes to be carried out in the switching system, is of particular importance. It is therefore connected to the sub-equipment of the system via lines. The arrows drawn next to the lines show the direction in which messages, control commands, etc. are routed via these lines. With the help of this control device, for. B. the deletion of circulating in the circular memories Ua and Ub addresses can be made.

The dial tone generator GW is used to supply the dial tone, the busy tone generator GB to supply the busy tone and the ring tone generator GF to supply the ring tone. They can be connected to the speech multiplex line SM via the switches gw, gb and gf . These switches are controlled with the help of the circulating memory Udw, Udb and Udf, in which, if necessary, pulses circulate as control commands for the control of the switches mentioned, with the same period as the addresses of participants in the circulating memory « Ua and Ub.
The creation and separation of

ίο connections in the time division multiplex switching system shown has already been explained in the description belonging to the main patent. The transaction this process is of secondary interest here and will therefore not be repeated described.

In order to measure a period of time according to the invention, in the time division multiplex switching system shown in FIG with the aid of a first and a second counting device of the central control device removed, unsuccessful requests for the allocation of one for the connection path The pulse phase to be used is counted based on reports that the lift has just taken off of the listener occur through the participant concerned. These counts are carried out in such a way that that the first control device only the first request and the second control device all requirements counts. To only take into account the cases where the subscriber is the listener prematurely hangs up again, the control command causing the circulation is used to write the Address of the subscriber concerned in the circular memory for addresses of subscribers with outgoing Traffic used to reset the first and second counters cause. A third counter is connected to these two counters, the by calculating the quotient from the counting results, the average period of time that the Subscriber is waiting for the dial tone.

The counting devices required for this traffic measurement are also shown in FIG. 1. The first is designated with Z 14, the second with Z 24 and the third with Z34. The counting input of the counting device Z14 and the counting input of the counting device Z 24 are preceded by the AND gate K 24. Here, a delay element is additionally inserted between the output of this AND gate and the counting input of the counting device Z14, which is denoted by ta.

One input of the AND gate K 24 is connected to the central control device E. From there the unsuccessful requests for the allocation of a free pulse phase are assigned to him.

leads. These unsuccessful requests are taken as components of control commands for the allocation of free pulse phases, which are carried out if reports about the presence of free pulse phases are involved as further components. These components are combined in the central control device with the aid of the and gate Ke . The output of this AND gate is connected to an input of the switch Sa , via which addresses in the address register G are optionally fed to the circulating memory Ua , namely when the AND gate Ke delivers a control command for allocating a free pulse phase. This happens exactly when

if, by closing the switch Sa, an address can be stored in the circulating memory Ua , which address then circulates there with this free pulse phase. The and gate Ke has two inputs. Messages about the presence of free pulse phases are fed to one input. The other input receives the unsuccessful requests for control commands for the allocation of free pulse phases. These also arrive at the delay element at, via which they are forwarded to the AND gate £ 24, namely when no control command is delivered from the output of the und gate Ke due to the lack of reports about the presence of free pulse phases. If, on the other hand, a control command is delivered from there, the forwarding of unsuccessful requests remains blocked by the delay element at , for which purpose this delay element is also connected to the output of the AND gate Ke.

The second input of the AND gate K 24 receives signals from the comparator 2 VZ for addresses when the addresses are the same, to which the addresses of the subscribers are fed one after the other by the address generator G used to query the subscriber circuits and the address of the subscriber to be monitored from the address register 2GZ. This ensures that the counting device Z14 and the counting device Z 24 can only be switched on if the address of the subscriber to be monitored is in the address register G, with his subscriber circuit being queried for its operating status.

It will now first be described how the measurement of the time span is carried out, which elapses from the lifting of the receiver by a subscriber with outgoing traffic until the onset of the dialing tone. This period of time begins after the address of the subscriber concerned has appeared in the address register G and an interrogation process has shown that he has lifted the receiver at his subscriber station. The central control device E then delivers at least one request for the allocation of a free pulse phase. If this request is successful, it is not counted because it is not passed on to AND gate K 24 via the delay element at. If, on the other hand, this request is unsuccessful, it will reach this and-gate. At the same time, a signal is sent to this AND gate from the comparator 2FZ. The comparator 2 VZ supplies this signal because the addresses in the address registers G and 2 GZ are the same. The counting directions Z14 and Z 24 connected to the AND gate £ 24 are therefore advanced by one count position by the request received at the und gate £ 24. The delay element ta comes into its working position. Depending on the work rhythm of the central control device E , a second request for the allocation of a free pulse phase is now delivered after a certain time. If this request also remains unsuccessful, it also arrives at the AND gate £ 24 and from there to the delay element ta and to the counter Z 24. The counter Z 24 is again incremented by one counting point. On the other hand, the delay element ta , which has already come into the working position, prevents the counter Z14 from also being advanced. The delay element ta , which operates somewhat differently than the delay element at , only comes to rest again when a larger pause has elapsed than that which lies between two successive requests for the allocation of a free pulse phase to the same subscriber. Therefore, any further unsuccessful requests that arrive are only counted by the counter Z 24. This count

ίο will continue until further requests fail. The counting results present in the counting devices Z14 and Z 24 then give each indicates that the subscriber waited for the dial tone and how long they waited.

For the sole consideration of the cases in which the subscriber hangs up the receiver before an allocation, the counting results in the counting devices Z14 and Z 24 are to be deleted again by resetting these counting devices. This is shifted here with the aid of the control commands possibly supplied by the and gate Ke for allocating a free pulse phase, which are those that are successful. These control commands are fed to the reset inputs of the counters Z14 and Z 24 when the address of the subscriber to be monitored is in the address register G. For this purpose, the output of the und gate Ke is also connected to the reset inputs of these counting devices via the und gate £ 44. The signals supplied by the comparator 2FZ are also fed to the AND gate £ 44. If the counting devices Z14 and Z 24 are not reset, the counting results available there are passed on to the counting device Z 34, which then calculates the average period of time that the subscriber waits for the dial tone by forming the quotient from the counting results supplied to it. This time span results when the unsuccessful requests for the allocation of a free pulse phase taken from the control device E follow each other at regular intervals.

In the traffic measuring method described above, a counter is to be used which is switched on via its counter input and is to be reset via a reset input, and to be sure, by all counting positions that were last switched on. It must be avoided that prematurely Counting results are passed on to another counting device. The counting device to be incremented and counted down is here the counting device Z 24. Incidentally, it has the same function as the counting device Z13 to be used in another of the traffic measurement methods described.

In FIG. 2 details about the structure of this counting device are now given. It is designated there by Z 2. It consists of the counter IZ 2, the AND gate KZ, the delay element t and the counter 2Z2. The counting device to which the counting results are to be passed on is connected to the counting device 2Z2. The signals to be counted are fed to the counting input of the counting device 1Z2 and to the delay element t . They are first counted by the counter 1Z2. The delay element t comes into working position as a result of the first signal. It keeps this as long as there are others to be counted at the specified intervals

Signals arrive. Only after a pause lasting longer than these provided time intervals does it return to a rest position, whereby it passes on a signal to the AND gate K 2. The delay element t works differently than the delay elements at and ta. With the forwarding of a signal, it also delivers a reset signal to the counter IZ 2 at the same time, by means of which this counter is reset. With this reset, the counting result that has arrived in the meantime is passed on to the counting device 2Z2 via the AND gate K2 , where it is still kept. The pause achieved with the aid of the delay element t after the last signal arrived is so long that reset signals for the counter 1Z2 possibly to be expected from another point have definitely arrived and reset them. The reset input of the counter 1Z2 is therefore not only connected to the output of the delay element t, but also to this other point, which is shown in FIG. 2 is indicated by an additional line leading away from this reset input. The counting device 2Z2 is therefore only fed those counting results which are actually to be taken into account in an intended way. It therefore only forwards such counting results to a further counting device connected to it.

In the case of the specified traffic measurement method, the lifting of the receiver by the calling and possibly also by the called subscriber is to be recorded so that information that can be evaluated for the traffic measurement method is obtained. To do this, messages about picking up and hanging up the handset are required. They are obtained here by cyclically querying all subscriber circuits for their operating status, for which purpose the address register G has to supply the addresses of all subscribers. The addresses are fed one after the other to the decoder Da via the switch Sd , which is closed at appropriate times. The decoder Da then successively sends signals to the subscriber circuits Π ... Tx, which deliver messages about their operating status via the bus SU to the central control device E , 4-5 where these messages are evaluated. These messages are also required independently of the implementation of a traffic measurement method for the processing of switching processes. The traffic measurement methods based on the invention accordingly make use of these queries from the subscriber circuits that are required anyway.

In the case of the one shown in Fig. 1 time division switching system shown Circular memories are provided for receiving addresses that are to be output periodically and control commands are used. Such a circulating store can now also be used in a manner known per se used in such a way that it embodies several counting devices at the same time (see British patents 858 275, 858 276). The counting devices then run in such a circulating memory assigned counting results in the form of code characters. The one belonging to the switching system central control device for processing received information and delivery of control commands can also be used for this purpose, the code characters circulating in this circular memory to change case-by-case in the course of the counts by making appropriate changes in the course of traffic measurements Delivers control commands.

Claims (2)

Patent claims: 1. Traffic measurement methods for telecommunications, in particular Telephone switching systems in which to handle switching processes centrally stored information assigned to the participants is used, which are monitored in such a way with the aid of counting devices that the counting results obtained Forming traffic measurement values for the switching system, according to Patent 1133437, characterized in that the The period of time is determined from the time a subscriber with an outgoing phone lifts the handset Traffic Elapses Before Dialing Tone By Measuring The Time during the commands for the allocation of a connection path from its subscriber circuit occur up to a device delivering the dial tone, with whose allocation the dial tone begins, and that to the sole consideration of the length of time that the participant in the case Lets pass by hanging up the phone before an allocation, the measurement of the time span is deleted again if an allocation really takes place in the case in question. 2. Traffic measurement method according to claim 1 for a time division multiplex switching system, in which the interconnection of connections takes place with the aid of addresses supplied by circular memories, corresponding to the telephone numbers of subscribers, and in which incoming information is processed by a central control device, which control commands for handling the switching operations supplies, characterized in that unsuccessful requests for the allocation of a free pulse phase to be used for the connection path are counted with the help of a first and a second counting device (Z 14, Z 24) of the control device (E), which are counted on the basis of messages of the handset that has just been lifted by the subscriber in question occur that these counts are made in such a way that the first control device (Z 14) only counts the first request and the second control device (Z 24) counts all requests that are solely taken into account ng the cases in which the subscriber hangs up the receiver prematurely, the control command causing the circulation to write the address of the subscriber concerned in the circular memory (JJd) for addresses of subscribers with outgoing traffic the resetting of the first and second counting device (Z 14 , Z 24), and that a third counter (Z 34) is connected to these two counting devices (Z 14, Z 24), which determines the average time span that the subscriber waits for the dial tone by forming the quotient from the counting results. 3. traffic measurement method according to claim 2, characterized in that the unsuccessful Requirements as components of control commands for the allocation of free pulse phases be taken, which are carried out if reports about the presence of free pulse phases are involved as additional components. 4. Traffic measurement method according to one of the preceding claims, characterized in that messages of lifting and hanging up the handset by the subscriber concerned are obtained by cyclically querying all subscriber circuits (51 ... Sx) on the operating state of these subscriber circuits. 5. traffic measurement method according to spoke 2 or 3 and according to spoke 4, characterized in that the first and second counting devices (Z 14, Z 24) are only switched on when a signal from a comparator (2FZ) is supplied for addresses when the addresses are the same, the address generator (G) used to query the subscriber circuits (51 ... Sx) is fed successively with the addresses of the subscribers and the address of the subscriber in question from an address register (2GZ). 6. traffic measurement method according to one of claims 2 to 5, characterized in that the Counting devices (Z 14 ... Z 34) are formed by a circulating memory by the Counting devices assigned counting results in the form of code characters circulate. 7. traffic measurement method according to claim 6 for a time division multiplex switching system, which has a central control device for processing received information and delivery of control commands, characterized in that the in which the counting devices (Z 14 ... Z 34) forming circular memory circulating code characters with the help this central control device (E) can be changed on a case-by-case basis in the course of the counts. Considered publications:
Siemens-Zeitschrift, 35 (1961), 7 (July), pp. 511 bis 514;
Telecommunications Journal, 14 (1961), 4 (April), pp. 179 to 189. 1 sheet of drawings 809 940/64 4.68 ® Bundesdruckerei Berlin