FI103620B - A method and apparatus for controlling a communication link - Google Patents

Description

Method and equipment for managing the communication link - Förfarande och anordning for behärskande av en communicationsförbindelse 103620

The invention relates to a method and apparatus for establishing a reliable communication connection 5 also in a highly interfered communication environment.

In poor quality telephone networks, and in particular cellular networks, modem data connections must be able to withstand various network interferences. These interferences vary from one connection to another and may change during the same connection, especially when the other party of the connection is a mobile station moving from one location to another.

10 Such an operating environment places quite high demands on the modem interference performance. Indeed, with current modems, communications in some cases are quite unreliable and slow. This creates a major barrier to the development of personal communications, particularly in mobile communications.

Fixed networks have significantly less interference than cellular networks. In fixed networks, the connection can be made simply by assuming that the conditions are generally quite stable, in which case the initial data may be quite limited so that they do not adequately describe the situation in a disturbed environment.

Cellular data transfer is a relatively new technology and modems used in cellular networks have been on the market for quite a while. Indeed, the product development of cellular combos has mainly focused on meeting functional requirements, so that the new problems brought about by the radio path used for data transmission have been neglected. Thus, it is mistakenly based on the * *: * assumption that using only error correction protocols (such as CCITT V.42) 25 would be sufficient to ensure a reliable communication connection. In fact, manufacturers have used the same software and methods for cellular modems as for fixed network modems, for example, for speed switching and the like.

Commonly used prior art PID control systems (PID, Proportional Integral Derivative) have constant thresholds for each input parameter that do not take into account interactions caused by cellular network interference. In addition, PID control systems cannot adapt to changed environmental conditions, but the system has to be adapted to the changing conditions 2 103620, for example by changing the modem software according to the use case. The user cannot tune the modem to suit different environments. In addition, there may be bursting interference on the radio connection, which may lead to premature disconnection, although it could have been resumed by reshaping the handshake / synchronization after the interference burst.

Known modems cannot utilize statistical information at all to establish a connection, such as telephone numbers, estimated connection length, and the range of previous connections. Until now, it has been desired to keep the speed check on the ongoing data link as simple as possible, since the processor control capacity of the modems has already been almost fully utilized. The use of more efficient processors also allows for more adaptive algorithms to take account of environmental changes without compromising the modem's basic performance.

Some modems provide the user with limited control over connection establishment, for example, so that he or she can select the desired data rate and activate specific handshakes, assuming the user makes the necessary modifications to the modem registers. However, this is too complicated for most users. Other modems do not have such capabilities at all.

It is an object of the present invention to provide a method for controlling a modem connection on a disruptive transmission path so that connection establishment and maintenance is more secure and faster.

To achieve this, the method according to the invention for managing a communication link on a disruptive transmission path when transferring data from an application program (2) to 25 desired access points is characterized by retrieving historical connection parameter information associated with the selected access point from the database during connection setup. by means of a predetermined algorithm, parameters for establishing and / or maintaining a communication link to the selected address to achieve an optimal communication link.

The apparatus according to the invention for managing the communication link is characterized by the apparatus comprising means for storing historical '·: parameters associated with the access points and means for selecting connection parameters during and / or during the connection by means of this information and a predetermined algorithm. for optimum data connection to the selected connection address.

Preferred embodiments of the invention are set forth in the dependent claims.

According to the solution according to the invention, in the connection establishment step, the control program retrieves from the database historical connection parameter information related to the selected access point and, based on this parameter information, selects parameters by means of a predetermined algorithm to establish an optimal communication connection to the selected address; during the communication link, the change-10 program monitors the connection's predetermined quality parameters, based on which, according to another predetermined algorithm and history parameter information stored in the database, changes are made to the selected connection parameters to maintain or terminate the optimum communication connection; and, at the end of the communication link, storing, in said database, the parameters associated with the access point selected by the control program that produced the optimum communication result during the valid connection as a whole. In this way, in the modem database, the access point or telephone number is associated with cumulative parameter information that provides an optimum communication result. When this history is used as parameters for the next data-link connection 20 to the same number, a good connection is more likely to be achieved.

The method of the invention may be used, for example, in a modem comprising: a modem function control block, a connection set-up block and a possible data pump block, wherein said blocks are interconnected and an external application program block through data communication pathways, and wherein the a parameter block running the modification program and the associated startup block running a direct::: algorithm; and a database block containing said database, wherein the intra-connection block blocks are interconnected by data communication paths. The method can also be applied to a digital data link such as GSM / RLP in use, whereby a data pump block and modulation / demodulation functions are not required.

• When the modem connects to the mobile station, the connection set-up block is further connected to the radio unit of the mobile station via a communication link. The hardware applies. ':' Connection procedure V.32bis and / or V.42, or equivalent connection and error detection rules for multi-rate modems.

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In the hardware parameter block, for example, an algorithm based on fuzzy logic is used. Alternatively, the algorithm may be based on neural networks or a dynamic adaptive method for changing parameter variables.

The method and apparatus of the invention can be applied, for example, to cellular networks in cellular networks, especially mobile phones. The method is also suitable for use in public telecommunications networks with interfering connections.

The invention will now be described in more detail by way of example with reference to the accompanying drawings: Fig. 1 is a block diagram of a connection setup according to the invention, 10 Fig. 2 is a block diagram of operation of a parameter block belonging to the method of the invention using fuzzy logic; Fig. 3 is a flow chart of the operation of a switching control block included in the method of the invention.

The invention will be described, by way of example, using a cellular telephone incorporating a modem in which the method of the invention is applied. Figure 1 is a block diagram of the operation of the modem connection set-up according to the invention. The modem comprises a control block 3 for conventional modem functions, a connection set-up block 1 and a data pump block 9. These blocks 1, 3, 9 are connected to each other and to the external application program block 2 via data paths sl-s6, s21-s22, s11-s13. The connection set-up block 1 further comprises: a switch control block 4 running a control program; parameter block 5, where the modifier is running, and associated with · ··; a bootstrap algorithm is running in the boot block; and a database block 6 containing a database; wherein the internal blocks of the connection set-up block 1 are interconnected by data communication paths. In the modem function control block (3), modem functions V.32bis and V.42 are applied which, in a known manner, allow data transmission at various speeds up to 14.400 bps and error correction. In addition, the modem is connected to the radio unit 8 of the mobile station. The various blocks are interconnected through data communication paths. The application block 2 shown in Figure 1 can be implemented either in the microprocessor of a mobile phone or in an external data processing device, for example as software operating in a so-called laptop computer. The application block 2 is connected to the modem via a suitable terminal bus.

; The following examines the construction of the data link. Suppose you want to send a file from a notebook (not shown) to an access point, that is, to a telephone number, 5 103620. This access point can be a subscriber to a public telephone network or a mobile station in a cellular network / cellular network. The application program, i.e., block 2 of Figure 1, provides a telephone number sll as the output data to the connection set-up block 1 and the size sl2 of the file (s) to be transferred and / or the estimated connection time s 13. Similarly, the connection block 1 receives system parameters s1 and other status From the data pump block 9, the connection set-up block 1 receives information about the current parameters s21 and the received signal s22, and the radio unit 8, respectively, information about the received signal information s32 and the power state provided by the base station s33.

In the connection establishment step, the control program of the optimum connection establishment control block 4 (OCEC) retrieves from the database historical connection parameter information related to the selected connection address and, based on this parameter information, selects parameters by means of a predetermined algorithm to establish an optimal communication connection. The function of the switching block 15 is to establish the communication connection which has the best chance of success on the basis of the statistics obtained from the database block 6 and the telephone number at the address. In addition, its function is to modify the variables associated with the telephone number in the database, so that the next connection can be quickly and optimally constructed using the basic data provided by the application program 20.

For example, the following historical connection parameter information can be stored in database block 6: the cumulative number of connections to the selected access point; cumulative connections to a non-selected access point. number; The most recently used data connection for the selected access point • · ·. . ·. 25 transmission speeds achieved; best data rate achieved by available protocols; the data rate and protocol most used in the cumulative connection time; statistics on how much each data rate in the current protocol has been used within the cumulative connection time. It will be seen that database 6 contains common information for both switch-30 control block 4 and parameter block 5.

: ·. In the implementation of the switch control block 4, two approaches can be used, the application program controlled operation and the transparent operation.

: Y In the first case, the connection set-up block 1 operates under the control of the application program 2; "'. Figure 3 shows a flow diagram of the operation.

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In step 23, the switch control block 4 waits for a phone number sll from the application program 2. The operation of the block 4 begins when the connection request of the application program 2 with its access address is detected. Data from application program 2 to modem is buffered or blocked in step 24.

5 - If the phone number is not in database 6 in step 25, this new number is added to the database and the default parameters for the standard connection in the database are copied to the new number's memory location. If there is no free space in the database 6, the oldest or least used telephone number is first deleted from the database.

If the number is in the database in step 25, the history-10 information corresponding to that number is read from the database in step 26.

Based on the historical or default information obtained, in step 27, the first algorithm selects the optimal protocol, i.e. the transmission method and the handshake method. The algorithm may, for example, seek the protocol and data rate that the History records indicate is most used for this telephone number 15. Step 28 examines whether the modem supports the selected handshake and protocol.

If the modem does not support the selection, you will return to step 27 and the default information will be used.

In step 29, buffering is terminated, and transmission of the buffered or stopped data from the application program 2 to the modem is started in step 30. Thereafter, the modem is connected to the radio part and the connection is established in a known manner. After the connection is established, the connection control is transferred to the parameter block 5, described below, for the method of the invention. The connection parameters used during the connection are cached.

In step 31, the control program of the switch control block 6 waits for the application program '· 2 to announce the termination of data transfer, whereupon the connection is disconnected.

25 - In step 32, the access address and connection parameters are cached in the data ** ·; to base 6, after which the modem goes back to waiting for the access point call • «* · * · ♦ to start stage 23.

In the Transparent method, the connection set-up block 1 monitors the traffic between the application program 2 and the modem function control block 3 in a transparent manner, i.e. the control is directed to the DTE-DCE interface. In this case, the control program can complete the AT dial command lines so that dialing seems completely normal for the application program, except that the control program cannot override the numbers dialed from the internal memory of the modem by the ATDS command. Similar to Figure 3, this transparent procedure takes the following steps: 35 - Specifying that the modem responds to the command "AT <cr>" with an acknowledgment OK or 0.

; 'If this does not happen, the program will complete the command and wait for the correct acknowledgment.

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Data from Application 2 to the modem is buffered to the ring buffer and checked to obtain the ATD command and the phone number.

The new number is added to the database and the modem settings are set to default parameters, but if the number is in the database, historical data is used.

5 - Select the protocol and the data rate.

The buffering is terminated and the data transfer is started, whereupon the selected parameters are cached.

When the data transfer is complete, the connection is disconnected and the number and connection parameters are cached to database 6.

10 The command interface between blocks 1 and 3 is also used to communicate AT commands to establish the connection. From block 1, the power level of the radio unit 8 is also controlled by signal s31.

During the ongoing connection, modem performance is monitored and controlled by Parameter Block 5 (APRC, Adaptive parameter renegotiation control). The function of the parameter block 15 is to change the variables related to the data connection so that the requirements for the connection are fulfilled. For this, both the history data stored in database 6 and the connection time estimate provided by application 2 or the length of the file to be transferred are used.

Parameter block 5 maintains the optimal operation of the modem and determines any action required by fuzzy logic. Here it is assumed that the fuzzy:. · The concept of logic is familiar and its principles are not explained in detail here. Learn More '! fuzzy logic and modeling based on fuzzy sets and systems; ; for example, see Earl Cox: "Fuzzy Fundamentals", IEEE Spectrum, '· 1 ·. Oct. 1992; Earl Cox: Adaptive Fuzzy Systems, IEEE Spectrum, Feb. 1993; and Jyh- • · '· 1 · ♦ 25 Shring R. Jang, "ANFIS: Adaptive-Network-Based Fuzzy Inference System", ..li Department of Electrical Engineering and Computer Science, University of V California, Berkeley, CA 94720.

The change program running in parameter block 5 uses an adaptive algorithm. During the data link validity period, the change program monitors the connection's predetermined 30 quality parameters, according to which, according to the algorithm and the history parameter information stored in the database '·', changes are made to the selected connection parameters to maintain or disconnect the data connection. First, the algorithm assigns a weight to all states of the variables that determine the effect of the state on the process logic. The formats and durations of the sets of workable fuzzies 103620 8 are changed according to predetermined rules and statistics obtained from database block 6.

Parameter block 5 has a start block 7 whose function is to detect, based on predetermined parameters, cases where the line conditions are so good that the operation of parameter block 5 based on fuzzy logic can be bypassed and switched directly to the output 22 (Fig. 2).

Figure 2 is a block diagram of the operation of a parameter block of a modem according to the invention. The modem parameter block 5 of the present invention comprises a start block 11, a variable blur block 12, a rule execution block 19, a terms 10 calculation block 18, a history data block 13, a rule fuzzy set block 15, a switch calculation block 16, and a blur discharge block 21. 19 includes decision machine block 14, control block 17 and thermistor block 20. The input of the parameter block is denoted by 10 and the output is denoted by 22.

When the operation of the parameter block 5 is started 10, the start block 11 first checks, based on the predetermined parameters, the cases where the line conditions are so good that the operation of the parameter block based on fuzzy logic can be bypassed and then goes directly to the parameter block output 22.

The decision input parameters for parameter block 5 are quantities: '20 - signal level received from data pump block 9, square error, average:;' squared error, peak square error; ; "- V.42 system parameters of modem functions to invalid packets

Ml. / number, total number of packets, expression phase timing, acknowledgment **. timing, maximum retransmissions, timing of inactivity; T! 25 - negotiable system parameters for modem functions, number of octet of data field, window size; the current data rate, the available data rates, the rate of use of the data rates at the current data rate of the modem function control block 3 of the modem function control block; the strength of the signal received from the radio unit 8, battery status, current, v transmit power, radio link parameters; and

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!: - of the historical data stored in the database 6 or the data stored in the decision algorithms of the parameter block 5, the moving average of the connection time, the moving average of the effective 1 · 9 103620 connection time, the data throughput at different data rates and the data throughput at different data rates.

The parameters of decision making of parameter block 5 are used for: 5 - modem function control block 3 protocol V.32bis with signals s2, s4, the need for data rate change (i.e., the connection data rate must be increased or decreased), disconnection message, not started data transfer, for change "; modulation function control block 3 error correction V.42 program sig-10 signal field number s2, s4 data field octet number change, window size change, detection phase timing change, acknowledgment timing change, maximum retransmission change, failure timer change; and a change in transmit power to the radio unit 8 by signal s31.

From the parameter block 5, the modem user interface (not shown) is provided with means for controlling modem operation by means of the Hayes-AT commands known per se and the S registers of the modem. In this case, the user may influence, for example, the following parameters: activate the possibility of changing the connection parameters; 20 - activate dynamic control; - storing a valid renegotiation profile of the data rate; 1, „- returns the change profile stored in memory; :, j [- resets the modem to the default change profile; ·· 25 - activate dynamic adjustment of V.42 parameters; . *. * - sets variables that control the timing of connection changes; • set variables that control the number of attempts to change the connection; sets thresholds that control automatic parameter block override; and select the blurring method.

• i; When line conditions are poor, the input variable information is provided to the variable blur block 12, which forms a fuzzy set for each variable. These, ·) · 'fuzzy sets are given to rule execution block 19 which forms the decision machine! block 14, rule block 17 and thermistor block 20 output the fuzzy sets. . for each output option and take them to block 15 of the outgoing fuzzy set.

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In the defrosting block 21, the blurry outgoing blurry sets are despread based on either the maximum of the fuzzy result set or the moment. The result of the method based on mixing maxima is dependent on the condition with the highest predictive value, and the method based on the article tends to give the result with the maximum effect of all 5 conditions. Once the blur is deselected, output to the parameter block output 22 can be made.

The modem parameter block 5 of the modem according to the invention operates adaptively by transmitting the History data to the History data block 13, based on the information obtained from which the switch calculation block 16 calculates how the block performance could be improved. 10 The coupling calculation block 16, respectively, provides this improvement information to the terms calculation block 18, which updates the rule block 17 and the thermal block 20, respectively.

It is to be understood that modem connection and error correction rules within the scope of the invention may conform to standards other than V.32bis and V.42, but this requires that the communication standard allow for speeds and error correction protocols when establishing a connection, and changing the speed and other connection parameters. being.

The method and modem of the invention provide the user with the ability to control parameters related to maintaining an optimal connection, however, with the program monitoring that the protocol rules are maintained. On the other hand, ... The system is completely transparent to the "regular" user and there is no need to make any changes to the system before the connection is established.

The method according to the invention is able to optimize the data transmission connection even with limited processor resources, since history data is used as a help. So you don't have to collect all the parameters here and make decisions in real time that you feel like. v. it is very difficult to find a good mathematical model and a device structure where such a model would work in real time.

Some fuzzy logic requires some memory, which can be used as per-RAM memory, which is known per se. Non-destructive memory must be used to ensure that the database and fuzzy 30 logical memory (FAM), as well as space weights and fuzzy sets, are stable. In this context, it may be mentioned that fuzzy logic is currently available in mo • '; from four vendors including American NeuraLogix Inc. and Fujitsu.

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Some embodiments of the method according to the invention have been described above. Naturally, the principle of the invention can be modified within the scope of the claims, e.g. with regard to functional details and areas of use. In particular, although the use of the method in connection with a modem has been discussed above, the required functions may be performed entirely in a mobile station, for example, and modulation / demodulation related to modems is not required when using direct digital communication.

The method according to the invention can be used to establish a communication connection which has the best chance of success in the light of statistical information. The solution of the Kek-10 invention can be applied especially in cellular networks as well as in public telecommunications networks as well as in new personal communication devices.

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Claims (29)

A method for handling a data transmission connection on a transmission path 30 with interference, where data is transmitted from an application program (2) to the desired connection address, characterized in that in the connection stage the historical connection parameter data associated with the connection connection is retrieved in the database. ; , the address, for example, with a control program, and starting from this parameter data 103620 is selected by means of a predetermined algo trim the parameters with which the data transfer connection is connected and / or maintained to the selected address to obtain optimal data transfer connection. The method according to claim 1, characterized in that during the time the data transmission connection is in effect, the predetermined quality parameters of the connection are monitored, for example, by a change program. Method according to Claim 1 or 2, characterized in that the output of said quality parameters is carried out as required according to a second predetermined algo trim and / or by means of historical parameter data stored in the database changes of the selected connection parameters to maintain the optimal data transfer connection or to disconnect the connection. Method according to claim 1 or 2, characterized in that since the predetermined quality parameters exist as said second algo trim, a direct activation algorithm used in the change program is used. 15 Method according to any of the preceding claims, characterized in that connection parameters are stored in the database in connection with the selected connection address, connection parameters used during the connection which have been in force, and quality parameters added thereto. Method according to claim 5, characterized in that in the final stage of the data transfer connection, in the said database with the control program, the parameters that connect to the given connection address are stored and generated an optimal data transfer result as a whole during that connection. . Method according to any of the preceding claims, characterized in that in the connection stage the amount of data to be transmitted and / or the estimated length of the connection from the application program is retrieved with the control program. Method according to any of the preceding claims, characterized in that at least one of the following data is retrieved from the application program at the connection stage: activation of repeated dialing with normal settings after a failed connection attempt; the permitted number of repeated calls; activating the control program for only one connection attempt. Method according to any of the preceding claims, characterized in that the historical connection parameter data stored in the database contains at least one of the following data: the cumulative number of connections to the selected connection address; the cumulative number of connections executed to other than the selected connection address; connection practices most recently used for data transfer to the selected connection address and the data transfer rate reached; the optimum data transfer rate achieved with the available connection approaches; the data transfer rate and connection practice most commonly used within the cumulative connection time; statistical data on how much data transfer rate for each connection practice was used within the cumulative connection time. Method according to any of the preceding claims, characterized in that one or more of the following functional blocks is used: a modem function control block (3), a connection block (1) and a data pump block (9), said block ( 1, 3, 9) may be connected to each other and to an extreme application log frame (2) via the data transfer buses (sl-s6, s21-s22, sl 1-s 13), and the connection block (1) may contain one or more several of the following functional blocks: a coupling control block (4) where the control program operates; a parameter block (5), in which the change program operates and in whose connected activation blocks the direct activation algorithm works; and - a database block (6) containing said database, wherein the internal blocks of the connection block (1) are connected to each other via the data transfer buses. Method according to claim 10, characterized in that the connection block (1) functions during the control of the application program (2), such that: - the function of the modem switch control block (4) is initiated when the application language: V: frame (2) connection call and connection address (s) 11) indicated (23), data controlled from the application program (2) of the modem is buffered or blocked (24), 30. if the connection address is not found in the database (23), this new connection is added: ·. part address to the database and in the database the basic parameters of the modem settings are read, but if the connection address is in the database (25), the corresponding historical data in the database (26) is read into the dialing stage (27) and in the selection stage (27) the connection practice is selected: '35 with the first algorithm, 103620 if the modem does not support the selected connection practice (28), another new connection practice (27) is selected, the buffering is terminated (29), the transmission of buffered or blocked data from the application program 5 is initiated (30) and the connection parameters are stored in the intermediate memory, message from the application program (2) terminating data transfer is awaited, whereby the connection is disconnected (31) and the connection address and connection parameters are stored (32) from the intermediate memory in the database (6), after which the modem responds to waiting for connection address calls (23). 10 Method according to claim 10 or 11, characterized in that the connection block (1) monitors the communications between the application program (2) and the control block (3) for modem functions transparently to define that the control block (3) responds with a predetermined acknowledgment sign 15 on the connection call ; data controlled from the application program (2) to the modem is buffered in a ring buffer and the connection address is indicated, if the connection address is not in the database, this new connection address is added to the database and in the database the basic parameters of the modem settings are read, but if the connection address is in the database , the corresponding historical data in the database is read to the dialing stage, and the selection stage of connection practice is chosen optimal connection practice with the first algorithm, if the modem does not support the selected connection practice, a new connection practice is selected, buffering is terminated and sending buffered data from the application φ is started, and the connection parameters are stored in the intermediate memory, «· · - message from the control block (3) for modem functions regarding • · · termination of data transfer, the connection is disconnected and the connection address and connection pair are awaited. the meters are stored from the intermediate memory in the database (6), after which the modem returns to wait for the connection address call. 30 Method according to any of the preceding claims 10-12, characterized in that: ·. modem functions control block (3) applies to connection practice V.32bis and / or '·.' V.42. . ' Method according to any of the preceding claims 10-13, characterized in that the algorithm block (5) uses algorithm based on blurry logic. 103620 Method according to claim 14, characterized in that the algorithm according to blurry logic comprises the stages in which: input data (10) is collected; 5. at the activation stage (11), output from predetermined parameters is indicated where the line conditions are so good that the function of the parameter block (5) can be bypassed according to blurry logic and can be directly passed to output data (22); wherein in other cases: in the blurry stage (12) of the variables Blurry groups are formed for the respective input variable; in the stage (19) for executing the rules is formed by means of a decision machine (14), the rules (17) and the terminology (20) blurry groups of output parameters; the blur of output parameters is removed in the blur (21) to remove blur and output data is given (22) to the modem control block (3); wherein the modem parameter block (5) works adaptively so that input data from the input stage (10) and new connection data generated at the execution stage (19) are passed to historical data (13), and output from this data forms the stage (16) for calculating coupling more optimal parameters for the modem and providing them with the calculation (18) of terms, the calculation (18) of terms updating the new data for rules (17) and terminology (20). Method according to any of the preceding claims 10-13, characterized in that an algorithm based on neuron network is used in parameter block (5). A modem according to any of claims 10-13, characterized in that in the parani / 25 meter block (5) a dynamic adaptive algorithm is used to change the parameter variables. • · • · Method according to any of the preceding claims 10-17, characterized in that the input parameter is used as the input parameter for the decision-making in parameter block (5): • level, square error, average square error, peak square error for a signal received from the data pump block (9); the number of incorrect packets among the system parameters for modem functions, the ··· total number of packets, the detection of fixed-time control, the acknowledgment-time control, the maximum number of open-source transmissions, the time control for malfunction; The number of octets in the data field among the modem functions negotiable system parameters, the font size; in the modem program of the control block (3) for modem functions and / or the program of connection practice the applicable data transfer rate, available data transfer rates, utilization rate of the data transfer rates with the applicable data transfer rates, and among historical data stored in the database (or stored in the database) in the parameter block (5), the varying average of the connection time, the varying average of the effective connection time, the data cycle reached with different data transfer rates, and the variable average of the data transition reached at different data transfer rates. Method according to any of the preceding claims 10-18, characterized in that for the input parameters of the parameter block (5) a weight value is determined which determines the influence of the parameter on the logic of the decision algorithm. 20. A method according to any of the preceding claims 10-19, characterized in that as output parameters for the decision-making of the parameter block (5), the eating utensil is used one of the following: 20. in the program of connection practice in the control block (3) of the modem functions. the need for change of data transfer rate, disconnection message, initiation rate for data transmission considered advantageous and for the program for error correction in modem functions control block (3) change of maximum number of octets, change of window size, change of fixed time control of detection, change of detection, change of detection, change of detection. change of the maximum number of panel transmissions, change of time control for: V malfunction. Method according to any of the preceding claims 10-20, characterized in that it is applied in conjunction with a telecommunications device, the connection block (1) additionally connecting via the data transmission bus (s31 -34) to the radio device (8) of the telecommunications device. Method according to claim 21, characterized in that, as input parameters for the decision-making of the parameter block (5), at least one of the following is used: the intensity of a signal received from the radio unit (8), the state of the accumulator,: the current transmission power and the radio connection parameters. 103620 Method according to Claim 21 or 22, characterized in that, as an output parameter for the decision-making of the parameter block (5), the transmitting power of the radio unit (8) is used or a change thereof. An installation for handling a data transfer connection, characterized in that the facility comprises means for storing historical parameters connected to the connection addresses and means for selecting connection parameters in the connection stage and / or during the connection with the help of this data and a predetermined algorithm for obtaining an optimal data transfer connection to the selected connection address. An installation according to claim 24, characterized in that it comprises means for measuring the quality of the connection and storing the measurement results in the connection parameters to be added as said historical parameters. System according to claim 24 or 25, characterized in that it comprises a modem with a modem function control block (3), a connection block (1) and a data pump block (9), said blocks (1, 3, 9) being connected to each other and an extreme application program block (2) via the data transfer buses (p. 1-6, p. 21-22, p. 1-13). Installation according to claim 26, characterized in that said modem connects to a telecommunications device. An installation according to claim 24 or 25, characterized in that it comprises a digital telecommunication device connected to a modem function control block (3) and a connection block (1), said blocks (1, 3) being connected to each other and to: an extreme application program block (2) via data transfer buses (p. 1-6, sl. 1-13). • T! Installation according to any one of claims 26-28, characterized in that said connection blocks comprise: a switching control block where the control program operates; a parameter block (5) where the change program works and in the associated activation block • the direct activation algorithm works; and 30. a database block (6) containing said database, wherein the internal blocks of the V connection block (1) are connected to each other via data transfer buses.