FI105980B - Procedure for processing a call setup request - Google Patents

Description

105980

The present invention relates to the processing of call set-up requests in telecommunication systems, and in particular to the conversion of a new call number-5 to be established. In the following, the invention will be described, by way of example, mainly with reference to mobile communication systems, although the invention may also be applied to other communication systems.

In known GSM systems (Global System for Mobile communication), the number-10 charge associated with a new call to be established is in the format required by the public telecommunication network for making a call, whether it is a mobile telephony, a call to a mobile station. In this context, a switching network refers to a network comprising one or more exchanges (PABX). Thus, a call set-up request including a number in the public telecommunications network format is transmitted to the mobile communication system for analysis. In this context, a call set-up request refers to an entity consisting of one or more Signaling messages or frames which is transmitted in a systematic manner. 20 to the call control process when the system subscriber dials his / her telecommunication terminal '; · [to dial a new call. The term '' i 'in this case means any telecommunication connection which may be established.

via a telecommunications system such as, for example, a voice call or a data call; helu. The public telecommunications network format is referred to herein as MSISDN

: Y: 25 forms in three parts, consisting of the country code, the national area code and, finally, the subscriber number. The country code «is up to three digits long and the entire MSISDN number is. ··«, up to 15 digits (however, the country code is not needed for calls to the same country).

30 The public telecommunication network format as described above and the so-called analysis tree for analyzing, for example, in the GSM system, the call type, v. HLR (Home Location Register), are analyzed. the request number is a very static and cumbersome solution.

There are therefore quite a number of limitations 35 to known mobile communication systems 35 regarding, for example, the ability of an operator to provide subscriber group specific numbers in a flexible manner. Such restrictions may, for example, exist for subscriber groups which include both mobile telecommunication terminal equipment and fixed terminal telecommunications terminal equipment.

The object of the present invention is to eliminate the limitations of the above-described known solutions and to provide a solution that allows the system operator to provide more flexible solutions, for example, for making calls within subscriber groups. This object is achieved by the method of the invention for processing a call set-up request in a communication system, the method comprising: receiving a call set-up request, determining the destination of the call, and transmitting the call set-up request to establish the call. The method of the invention is characterized in that the method comprises the steps of: defining a plurality of parallel number spaces, and defining at least some of the system telecommunication terminals nu-15 meros in said plurality of parallel number spaces, receiving a call set-up request to establish a new call; and the destination of the call being established based on the bus information contained in the call set-up request and the source of the call set-up request is converted. 20, the number included in the call set-up request from the format in the cleared number space to the number space required by the call object, and replacing the number included in the call set-up request with the number space required by the call object.

'I

';. before sending a call set-up request.

The invention further relates to a system for processing call set-up: T: requests, which system includes at least a master process and an analysis process, whereby the analysis process determines the master process. the call establishment request received, and the master process forwards the call establishment request to establish the call. The system according to the invention is characterized in that said system utilizes a plurality of parallel number spaces, whereby the number included in the call set-up request can be any number in the available number space, so that the analysis process based on the bus data contained in the call set-up request and the source of the call set-up request, that the system also includes a conversion process, , and that the system replaces the number contained in the call-5 request request with the number retrieved from the conversion process memory before the master process forwards a call set-up request.

The invention is based on the idea that making calls and entering related dialing numbers becomes more flexible as multiple parallel number spaces are defined in the system of the invention. In this case, the system subscriber can make a call with any number in use, whereupon the system analysis process takes care of the used number space, and the conversion process then converts the used number space to 15 where it should be to route the call to the correct destination, i.e. . The number of available ridge spaces can be two or more, depending on the implementation.

One important advantage of the solution according to the invention is that it allows for flexible handling of those belonging to different number spaces. 20 and therefore forward call set-up requests between systems using different numbers. The determination of the number space used does not only have to be based on the analysis of the number entered, but also the call origination request source, which describes, for example, which system the teleservice request originates from, and the call origination request. , that is, information about which network the call should be handled.

. ···. By making the call set-up processing system modular by dividing it into a number of independent sub-processes 30, a system capable of handling a wide variety of speech freedoms is tailored to the specific cases in question.

In addition, the subprocesses can, if desired, be distributed to various network elements .v. • in such a way that the various sub-processes of the system can be executed in the network elements which are • best placed to do so. The modular system 35 also provides the advantage that the system can be modified with great flexibility to meet new needs that may arise later.

• · 4 105980

Preferred embodiments of the method and system of the invention are disclosed in the appended dependent claims 2 to 3 and 5 to 8.

The invention will now be further described, by way of example, with reference to the accompanying drawings, in which:

Figure 1 is a flowchart of a first preferred embodiment of the method of the invention, Figure 2 is a block diagram of a first preferred embodiment of the system of the invention, Figure 3 illustrates a call TETRA-PSTN, Figure 4 illustrates a call TETRA-PABX, Figure 5 illustrates a call PSTN-TET illustrates the call with PABX - TETRA.

Figure 1 shows a flow chart of a first preferred embodiment of the method of the invention. The flowchart of Figure 1 can be utilized, for example, in processing call set-up requests for new calls to be established in a TETRA mobile communication network (TErrestrial Trunked RA-dio).

In block A, the system mobile station is assigned a number 20 of the available parallel number spaces. In the case of TET-t RAs, which can be used to make calls from a mobile station within the TETRA network, to the public switched telephone network and to its own switchboard network, ff · an individual TETRA Subscriber Identity (ITSI) number must be defined for the individual mobile station; . TETRA Mobile: Y: 25 can be used to call another TETRA Mobile by directly selecting that ITSI number. In the case of two mobile stations of the same TETRA network, it is also possible to make calls directly from one mobile station to another. ···. with the SSI number (Short Subscriber Identity). In addition, the TETRA mobile station must be assigned a public telecommunications network number, or MSISDN number, I ____ 30, by which the public telecommunications network can be called to the TETRA mobile station. Still further, so that the telecommunication terminals belonging to the mobile station's own organization can call the mobile station at the organization's exchange.!! Since the organization has an internal telephone number, the mobile station must also be assigned a user group-specific number, the Fleet Specific 35 Short Number (FSSN). In this case, the system uses three parallel 105980 5 spaces, so that each number space contains a number that can be used to make, for example, a voice call to the same mobile station.

In block B, a new call set-up request is received. In this case, the call set-up request includes at least a number indicating the telecommunications terminal-5 device on which the new call should be established, i.e., the B-subscriber number. The number included in the call set-up request can be any number space defined in the system, that is, an ITSI, MSISDN, or FSSN number. The call set-up request, which in this context refers to the system-transmitted set of one or more signaling messages transmitted to the system, also contains information other than a B-subscriber ID, such as A-subscriber ID, indicating the telecommunication terminal from which the new call is to be established.

Block C determines to which number space the B subscriber ID included in the call set-up request belongs. Further, the destination of the call is determined, i.e. to which network the call should be routed.

In the case of a call set-up request from a TETRA mobile station, the mobile station transmits bus information indicating the network to which the call should be routed. This bus information is also based on the resolution of the number range of the number included in the call set-up request, i.e., the number is assumed to correspond to the number space required by the object indicated by the bus information. In practice, the user of a mobile station * · · '·', for example, by entering a predetermined number in front of a dialing number, or for example by pressing a predetermined key «« on the mobile station, assigns the mobile station a network (e.g. The mobile station then transmits: T: bus information over the radio path to the TETRA network so that it can be utilized, inter alia, in number conversion.

If, on the other hand, it is from a location other than the TETRA network, ···. a call set-up request from the mobile station, determining the destination of the call based on the source of the call set-up request. That is, if the source of the call request:. * V is from a public telecommunications network or a switching network in an organization, the call is identified as a TETRA network. Also, the number space in the number included in the call set-up request is determined based on the source of the call. That is, if the source is a public telecommunications network interconnection line, the number included in the call set-up request is assumed to be MSISDN, and similarly, if the source is a connection line of an organization switching network, the number included in the call set-up request.

In block D, the number contained in the call set-up request is converted into the number space required by the subject. The conversion can be performed on a case-by-case basis, for example, by retrieving from the memory a conversion table marked with corresponding numbers in different number spaces. Alternatively, the individual mobile subscriber information may have its number stored in different number spaces. In this case, if the mobile station whose number is being converted has been identified, the conversion can be performed by retrieving the number in the correct number space from the subscriber data of that mobile station.

In block E, the number included in the call set-up request is replaced by a number generated by the conversion of block D, which is in the format of the number space required by the call subject.

In block F, the call set-up request is forwarded to the voice call control so that a new call can be established.

Fig. 2 is a block diagram of a first preferred embodiment of a system according to the invention. The system 2 for processing call set-up requests shown in Figure 2 can be utilized, for example, in a 20 TETRA network.

The system 2 of FIG. 2 for processing call set-up requests consists of modules or subprocesses that are controlled by the system master process 3 to process the call set-up request as required by the call case in question. Depending on the implementation of the system, the subprocesses may be executed in different network elements, i.e. computer programs executed in different telephone exchanges, for example. The call set-up requests are forwarded to the master process 3 from the call control unit 1,. ···. to which also the call set-up request is returned after the number conversion to establish a call.

Not all modules shown in Figure 2 are used in all • · v: cases, and the order in which the modules participate in the number conversion ί. ,, ϊ depends on the type of call in question. Master Process 3 takes care of the necessary- ·! ·. I do not transfer data between different modules. The modules work so that for them

* · I

certain parameters are input to the output data, on the basis of which the modules produce · 35 results that the master process can input to another module as output data, if necessary. The operation of the modules is independent of each other.

7 105980 The identification process 4 included in System 2 provides the information needed to perform numerical analysis and conversion. The authentication process includes an organization module 4.1 which identifies the organization / user group to which the subscriber belongs, based on the ITSI number of the telecommunications terminal or the connection line used. User Module 4.2 identifies the subscriber by its ITSI number. Cell module 4.3 identifies the cell in which the mobile station is located based on information transmitted from the base station and produces a cell code describing the location. This code can be used, for example, for emergency calls. The gateway module 4.4 identifies the gateway from which the speech-request has been received and, based on this, outputs the parameters of the organization corresponding to the gateway.

For example, in the analysis process 5, the number recognition module 5.1 receives, for example, dialing, service type, subscriber parameters, organization parameters, bus information, cell code, gateway ID, caller number 15, and time and date. Based on this information, the number recognition module 5.1 determines the subject of the call and the number space to which the number in the call origination request belongs. This information is derived from the call destination parameter and the call type parameter provided by the nu detector module 5.1.

The conversion process 6 receives the number and information about the number '; * 'From the space to which that number belongs and the number space to which the <<number is to be searched. Based on this information, the conversion process redirects its received number to the correct module 6.1 - 6.4, where the conversion takes place. In the case of Figure 2, each module 6.1 to 6.4 is capable of handling one convention of 25 versions. The conversion process thus produces a number in the number space required by the object.

Review process 7 performs the necessary checks to find out ···. sex whether the call to which the call set-up request relates is allowed. Call Authorization Module 7.1, based on the call type, subscriber parameters and organization parameters, determines whether the subscriber in question is able to make a call of that type. The CLIP / CLIR / COLP module 7.2 determines the subscriber data • · ♦: justifies whether the caller ID (A-subscriber identity) is known and is allowed to be forwarded to the call recipient (CLIP, Calling Line Identification Restriction; CLIR, and COLP, Connected Line 35 Identification Presentation). The transfer module 7.3 checks, based on the ITSI number, whether the call forwarding has been activated by that subscriber. The transfer module provides information which indicates 8 105980 whether call forwarding is activated, the number to which call forwarding is activated and the destination (TETRA / PSTN / PABX) where call forwarding is activated.

The editing process 8 adds and deletes the individual numbers from the number included in the call set-up request. That is, if, for example, the number is entered in the form 0605551234 but should be in the form 5551234 in order to be properly routed, then the editing process 8 takes care of deleting the extra numbers. Both the Dialing Module 8.1 and the Dialing Module 8.2 receive the number and call type as output data. Based on these, they modify the number into a predetermined format.

Figure 3 illustrates a call to TETRA - PSTN, that is, when TETRA

a call is made from the mobile station MS of the network to the subscriber of the public telecommunications network. Figures 3 to 6 illustrate various call cases, showing the order in which the processes are executed. However, the information does not necessarily move as shown by the arrows in the figures, but in practice the data can be transmitted from one process bridge to another via the master process shown in Figure 2.

In Figure 3, the identification process 4 identifies the mobile station (user) based on its ITSI number, the cell code based on information transmitted by the base station, and the user organization on the basis of the mobile subscriber information. The analysis process 5 detects, based on the bus information, that it is. 20 calls to the public telecommunications network. In this case, the analysis process assumes that the B- · subscriber number is in MSISDN format, so it does not require conversion. It-V ': as opposed to being a call from a mobile station (cell is ·' ... · known), the number recognition module detects that the caller's number, i.e. A-4 (Ύ I subscriber ID is in ITSI format, which requires conversion).

Based on the subscriber data of the mobile station, the verification process 7 determines that calls may be made from that mobile station to the public telecommunications network and that call forwarding is not activated. If the call is not allowed, the call will be interrupted. processing the call set-up request in block 9, wherein the call fails.

«

Conversion process 6 receives the A-30 subscriber ID in ITSI format, which it converts to MSISDN. Converting ·

to provide the B-subscriber with a number that allows the B-subscriber to make v '* calls to the A-subscriber. You cannot make TETRA calls from the public telecommunications network

,, for the mobile station of the network with its ITSI number, hence the ITSI number kon- '. is evaluated as an MSISDN number, whereby subscriber B is provided with a number to use to call subscriber A. The B-subscriber number does not require conversion (since the analysis process found it to be the correct number space 105980 g ro). Conversely, the editing process 8 may need to perform deletion or insertion of some numbers (e.g., country code) in order to properly format the number. Similarly, the editing process 8 may also need to add or delete numbers from the A-subscriber ID.

5 Finally, the verification process 7 checks whether the A-subscriber ID should be forwarded to the B-subscriber. Thereafter, the call setup request is returned through the masterprocess to the call control to establish a call to the B subscriber.

FIG. 4 illustrates a call to a TETRA-PABX, i.e., when a call is made from a TETRA mobile station MS to the mobile station's own organ-10 foundation switching network. The identification process 4, the analysis process 5 and the verification process 7 operate in exactly the same way as described in connection with Figure 3, except that this time the analysis process 5 detects, based on the bus information, that this is a call to the PBX. In this case, the analysis process assumes that the B-subscriber number is in the format of the exchange network 15, i.e. it does not require conversion. Thus, the B number is edited only in the editing process 8 by adding / deleting individual numbers. Conversely, the A subscriber number in the ITSI format is converted to the FSSN format, i.e., the number space number by which the subscriber network subscriber can call the mobile station MS. Thereafter, the processing of the call set-up request 20 proceeds similarly to that of Figure 3.

FIG. 5 illustrates a call PSTN - TETRA, i.e., in the case of FIG. 5, a call is made from the telecommunications terminal 10 of the public telecommunications network to the mobile station MS of the TETRA network. In this case, the analysis process 5 detects that the source of the • • call set-up request is a public telecommunication network, i.e. a call set-up request: V: 25 is received from line XX (link line between TETRA and PSTN). The analysis process then assumes that the number included in the call set-up request, i.e. the B-subscriber identifier, is in PSTN format, as well as A. ···. the subscriber ID is in PSTN format, and the call is directed to the TETRA network.

, ···. Conversion process 6 converts the B-subscriber ID into the number space required by the TETRA network t * '30, i.e., the ITSI number. The A-subscriber number does not • ♦ require conversion because a TETRA mobile station can make a • · · 5 ,,, · 'call directly to a public telecommunications network number. After that, the authentication process-. ·! ·. si 4 identifies the mobile station to which the call is being made, and the organization, and retrieves the subscriber information of the mobile station. The checking process 7 determines whether the mobile station MS is entitled to receive a call from the public telecommunications network, whether the A-subscriber identifier is to be forwarded to the mobile station, and whether the mobile station has activated the call transfer. If the mobile station has activated a call transfer which requires conversion between different number spaces (e.g., transfer to a public telecommunications network number), the conversion process 6 performs the necessary conversion.

Finally, the editing process 8 modifies the A-subscriber number and the B-5 subscriber number by adding / deleting numbers as needed so that the number is in a predetermined format. Thereafter, the call setup request is returned by the master process to the call control.

FIG. 6 illustrates a call to a PABX-TETRA, i.e., a call from a PBX 10 to a user group-specific number 10 to a TETRA mobile station MS. In this case, the authentication process 4 detects that the source of the call set-up request is the connection line 14, i.e. a particular exchange network. Based on this, the identification process 4 identifies the organization in question, whereupon it retrieves user group information for that organization.

The analysis process 5 detects that the source of the call set-up request is a switch network, i.e., the call set-up request has been received from a link line 14 (link line between the switch network and the TETRA network). The analysis process then assumes that the number included in the call set-up request, i.e. the B-subscriber identifier, is in a switch network format, as well as A-. The 20 subscriber IDs are in the format of the PBX and the »· call is a TETRA network.

The conversion process 6 converts the B-subscriber number into a number space format required by the TETRA network, that is, an ITSI number. A- • · subscriber number does not require conversion because the TETRA mobile station: V: 25 can make a call directly to the PBX number.

: T: The authentication process 4 retrieves the mobile station subscriber information based on the ITSI number, with which the verification process 7 determines e.g. call right ···. and any transfers. Modification process 8 transforms the A-subscriber number and B-subscriber number into a predetermined format, after which the call-mode request request is transmitted from the master process back to the call control.

It is to be understood that the foregoing description and the accompanying figures are merely intended to illustrate the present invention. Thus, the invention can also be applied to systems other than the TETRA system exemplified above. Various variations and modifications of the invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention as set forth in the appended claims.

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Claims (8)

A method for processing a call formation request in a data traffic system, wherein: a request for call formation is received, the call cause is clarified, the call form request is forwarded to form the call to the call cause, characterized by the process comprising the stages in which several parallel number spaces are defined for use, and for at least some of the system's telecommunication terminals, numbers are defined in said Hera parallel number spaces, a request for call formation is received to form a new call, to be formed is determined on the basis of the road information contained in the request for call formation and on the basis of the call for request for call formation,,: the number in the request for call formation the number is converted from; : 20 the format used in the clear number space for a number in the number space required by the call's reason, and! '. the number entered in the call formation request is replaced by one; ! ' numbers in the number space required by the call's message before requesting '; ]; ' call formation was transmitted. (Il '25 2. A method according to claim 1, characterized in that at least two parallel number spaces are defined for use. • · · Method according to claim 1, characterized in that said data traffic system is a mobile telephone system which has telecommunications. numbers for which a number is defined from at least three different number spaces • · * \ .m. ' 30 in such a way that the number included in the call formation request may be a number in the public telephone network, a number in a switching network or a number ϊ V: in a mobile telephone system. A call processing request processing system, which comprises at least one master process (3) and an analysis process 35 (5), wherein the analysis process (5) clarifies the target for request for call formation received by the master process, and the master process (3) transmits 16 The request for call formation further for forming the call, characterized in that several parallel number spaces are used in said system, the number contained in the call formation request being a number in which heist in use being the number space, that the analysis process (5 ) clarifies the reason for the call and the number of spaces to which the number in the call formation request belongs on the basis of the road information contained in the request for call formation and on the basis of the call for request for call formation, 10 that the tili system also hears a conversion process (6) which fetches from a memory on the base of the call number and request number h the number space as the analysis process (5) clarified the number corresponding to the number contained in the call formation request and which is required by the call's message in accordance with the number space, and that the system (3) replaces the number entered in the call formation request with a number as the conversion process retrieved from memory before the master process (3) forwards the request for call formation. System according to claim 4, characterized in that the analysis, analysis process (5) clarifies: that the number contained in the request for call formation is in a format. . according to the number space of the public telecommunications network if the road information shows that t "'; the target of the call is the public telecommunications network (PSTN), that the number included in the request for call formation is in a format according to the number space of a switching network if the road information indicates that the" The call is a switching network (PABX), that the call's target is a mobile telephone network (TETRA) and that the number • · * included in the call formation request is in a format according to the number space of a switching network if the call for request for call formation is a gateway. m line that the call's target is a mobile telephone network (TETRA) and that the number **: ** contained in the call formation request is in a format according to the number space «· V,: for it The public telephone network on the source of the call formation request consists of '·. ··: a gateway line in the public telephone network. System according to claim 4 or 5, characterized in that the analysis process (5) and the conversion process (6) are independent processes separate from the master process (3). 17 105980 System according to any one of claims 4-6, characterized in that the master process (3), the analysis process (5) and the conversion process (6) have been distributed on different network elements. System according to any of claims 4-7, characterized in that said system (2) for processing the request for call formation is part of a TETRA mobile telephone system. * »» M I I I I «« I «« · • «t • ♦« • · • · v m • · 1 • · · • · • · · · · · ·