Method for the combined operation of a CT-system and a mobile radio system for implementing the method

Technical field

The invention relates to a method for the combined operation of a CT system and a mobile radio system and an arrangement for implementing the method.

State of the art

Because of their different use were originally designed for mobile systems one hand, and for radio systems for the purpose of cordless telephony on the other hand different technical standards concerning transmission frequencies, Transmission protocol, reach, etc. developed. This meant that most of the Cases no compatibility exists between mobile radio systems, such as those for automotive telephony are used, and so-called CT systems (CT = Cordless Telephone), ie small-scale radio systems for wireless telephony.

Mobile systems are not always, but frequently (eg GSM networks) cellular systems a cell-like structured coverage area. In each cell communicate mobile stations (Mobile Station) via a radio interface (air interface) with a stationary base station (base station). The base station can by means of suitable Communication links (eg, wireline telecommunication links, Directional beam connections, wireless connections, etc.) with other cells of the same Mobile radio system and / or other telecommunications systems to be connected. Typical Ranges in mobile radio systems (ie, cell radii for cellular systems) are in Ranging from a few km to about 60 km. The frequency allocation is carried out at the cellular Mobile systems usually due to an active cell planning. Cellular Mobile systems have a mobile switching center MSC (MSC = Mobile Switching Center), which supports to mobility management. provide the mobile stations at certain intervals repeatedly information about their position in the cellular Network (so-called mobility data) to the MSC. In cellular systems with relatively small Cells and a ensprechend large number of cells, such as in GSM networks include the mobility data is usually not directly identifying a Base station, wherein the mobile station is reachable, but the identification of a called paging area. A paging area comprises a plurality of cells, a whole Cell cluster. Once the MSC, which generally also to a fixed network (for example, the international telephone network) is connected, one for a requested mobile station receives particular call, it searches the searched mobile station because of a Database stored mobility data. In a GSM network the mobile station is initially wanted on pager (pager) in its last reported paging area. If the mobile station for paging receives, she contacts via the base station, in whose Coverage area it is located at the MSC, whereupon the MSC the caller with the this mobile station connects.

Contrast CT systems typically include one or more fixed Base stations (fixed part) attached to a terminal of a most wired Fixed network (telecommunication network) is connected, and one or more portable, Cordless handsets or Cordless Phones (Portable Part), which has a can communicate radio interface with the base station. Typical ranges are in the range of 50 m to several 100 m. Frequency allocation is usually by a dynamic, automated method to frequencies currently just are free.

On the user side, there is a great need for a way to combine CT systems and mobile systems. For users who both a CT-system as well as use a mobile phone, would be a combination of both systems extremely advantageous, especially if they thereby via a mobile telecommunication terminal, for example, would come in the form of a mobile telephone handset, in which both a cordless phone one or more (small-scale) CT-systems as well as a mobile station for a is or more (large-scale) mobile radio systems used. such a Telecommunication terminal which is usable in at least two different radio systems, called DMT (Mode Terminal Dual). Ideally, the user would be a DMT reachable always under the same phone number, regardless of about which of the different radio systems the communication takes place. Is to However, an appropriately equipped DMT not only necessary, but it must even the network support such Einnummern service.

There are already several proposals for the combined operation of large-scale Mobile systems and small-scale radio systems have been made. A DECT / GIP called proposal by ETSI provides to the fixed part of a CT system, the the DECT standard is operated emulates a subsystem of a GSM base station, which is connected to the A-interface. is In another proposal by ETSI provided that a CT system that is betireben according to the DECT standard, via ISDN is connected to a GSM mobile radio system: the fixed part of the CT system is to an ISDN connection of the mobile switching center MSC (MSC = Mobile Switching Center) connected. The D channel signaling protocol is extended to the signalization to support mobility management.

For the production of simple and inexpensive DMT for combined Operation in a mobile radio system and a CT system, it is desirable that as many devices as components such as antenna, receiver, transmitter, etc. for both the are useful mobile radio system as well as for the CT system. For this reason, one sees More recently, GSM-CTS-called proposal, a GSM mobile radio system with a CT system combine that for a for the purpose of cordless telephony modified GSM standard is operated (CTS stands for "Cordless Telecommunication System").

All known proposals for a combined operation of CT systems and Mobile systems assume that the fixed part of a CT system over a ISDN terminal is connected to a landline. Most of the existing CT systems, which have gained in recent years has strongly spread, but do not yet have an ISDN connection. This means that none of these systems according to any one of the above-mentioned proposals to a mobile radio system can be combined.

As a mobile telecommunication terminal, a telecommunication terminal is (telephone in the following, Fax, called data transmission modem or similar), the communication electromagnetic waves via a radio interface (air interface) sends and / or receives. A useful for at least two different radio systems mobile Telecommunication terminal is a DMT (Dual Mode Terminal) refers. Under a fixed station is generally understood to be a typically fixed radio station, in the particular case, a CT system whose fixed part. In the example of a tandem for the operation equipped car mobile phone is the base station but not actually fixed, as the base station in this case from the fixedly mounted in the automobile part of the plant consists. The coverage area of ​​a radio station is the area in which a mobile Telecommunication terminal can communicate over the radio interface with the radio station. The term "a telecommunication terminal is registered with a base station" (Base station in the case of a CT system) meant that previously to the registration and login a registration procedure has been successfully performed. In the course of such Method is usually checked, among other things, whether the appropriate free channels Communication between the telecommunication terminal and the station is, whether the Telecommunication terminal with sufficient certainty within the coverage area of ​​the station is whether the telecommunication terminal an authorization to use the station or Station network has so usually need to register at regular Intervals to be renewed, otherwise it is deleted. Den at a base station of a CT system "Register" and "de-register (registration or delete)" mentioned Operations correspond to the base station of a mobile radio system, especially a GSM network, "attach" (login) and "detach" (unsubscribe) said operations. Among registration (or "attach") of a telecommunication terminal in a system (network) means a registry (or "attach") of the telecommunications terminal at least one of the stations of the system (network). Among the routing data are those data To understand the means for preparing a so-called "routing", Telecommunication connection between two terminals one of several possibly partly different subnets existing telecommunications network, are required. If a the connections from a mobile station of a mobile radio network is consisting of Routing data and mobility data that mobile station.

Summary of the Invention

The invention is based on the object, a method for the combined operation of to provide a CT system and a mobile radio system, the possible one simple and inexpensive adaptation of existing CT systems and / or Mobile systems for combined operation allowed.

The object is the subject of the independent claims 1, 7, 8, 9 and 11th

According to the invention, in a method for the combined operation of a CT system and a mobile communication system required for the combined operation additional information about the mobile radio system queried. As the "for the combined operation needed additional information "are only those to understand information that is not for the combined operation compared to the combined operation of the two systems are required in addition. At transfer of data (in particular, the routing data), which already at the non-combined Operation of the CT system and / or the mobile radio system are transmitted is nothing changed.

The inventive method for the combined operation of a CT system and a mobile radio system makes in contrast to the known method no Restrictions on the connection of the base station of the CT system to the Telecommunication network, or in relation to the CT for the standard used system. The inventive method is suitable both for all conventional telecommunication network connections as also for all conventional CT standards such as GSM-CTS, CT1, DECT etc. are usable. The only requirement for the inventive method for the combined operation is that the coverage area of ​​the mobile radio system and the coverage area of ​​the CT system are at least partially overlapping. In those areas, each only be covered by one of the two systems is not a combined Operation, but at least a sole, not combined operation of these systems possible. The prerequisite for the inventive method is much less restrictive than the requirement in accordance with the known proposals for the combined operation, after which the base station of a CT system to a digital connected connection, in particular an ISDN connection, a telecommunications network have to be.

Preferably attempts a communication with both the CT system and with the mobile radio system suitable mobile telecommunication terminal to the CT system Register as soon as it is located near a base station of the CT system, and to "detach" after a successful registration with the CT system using a -Vorganges log out of the mobile radio system 18th The information about the "detach" operation, indbesondere the information that the telecommunication terminal has logged off, is preferably stored in a storage device of the mobile radio system further , the mobile telecommunication terminal after a successful registration with the CT system Register by means of a "attach" -Vorganges mobile communications system (preferably after it has logged off previously), wherein when logging into the mobile radio system Information about the "attach" procedure, in particular the identity of the CT system, wherein the mobile telecommunication terminal is registered in a Memory device of the mobile radio system are stored.

In one embodiment of the invention a Einnummern service is provided with Using scannable mobile communications system information (especially those in stored the memory device) to a subscriber of a telecommunications network, the is connected to the CT system and the mobile system to allow the mobile Telecommunication terminal always reach under a single, uniform number. Preferably, the Einnummerndienst by participants of the mobile radio system or of the CT system may be used.

The mobile system can be for example operated according to the GSM standard, and the CT system may according to one of the standards DECT, CT1, GSM-CTS, or any operate other suitable for CT systems standard.

An arrangement for carrying out the inventive method comprises a Base station of the CT system, a communication with both the CT system and with the mobile radio system suitable mobile telecommunication terminal, a Storage device (preferably mobile communications system) and a Circuit device for routing a call from a participant Telecommunications network for mobile telecommunication terminal. Preferably also calls are routed from the mobile radio system and / or by the CT system.

In one embodiment of the invention, the base station is connected via an analog connection connected to a telecommunications network.

A mobile telecommunication terminal according to the invention has a circuit to be at To register a CT system as soon as it is of close to a base station CT system is a circuit to a "detach" operation at the mobile radio system conduct can, and a circuit for transmission of information on the "Detach" operation to the memory device of the mobile radio system. has Preferably the mobile telecommunication terminal further comprising a circuit for performing an "attach" -Vorganges the mobile radio system and a circuit for transmission of information through the "Attach" operation to the memory device of the mobile radio system. These Information may include information concerning the CT system in which the mobile telecommunication terminal has registered.

A circuit device according to the invention, an apparatus for querying of information, in particular from the storage device, mobile communications system, and a device for providing a service Einnummern to the using Information to route calls to the telecommunication terminal, said Telecommunication terminal is always invoked with a single, uniform number.

The Abdeckungsbreiche the mobile radio system and the CT system are partially overlapping. In some cases, for example when the mobile radio system according to the GSM standard, and the CT system are operated according to the GSM standard CTS, the two Systems are also operated in frequency terms, overlapping.

The following detailed description of the present invention is used in conjunction with the accompanying drawings as an example for a better understanding of the invention and is not to be construed as limiting the scope of the claims. For skilled in the art are from the following description in conjunction with the accompanying drawings and the totality of the claims further advantageous Embodiments and combinations of features readily identifiable, but still be within the scope of the present invention. Particularly according to the inventive method and the combined operation of several CT systems and / or more mobile radio systems possible, although for simplicity always only half of the combined operation of a CT system and a Mobile radio system is described.

Brief Description of Drawing

The drawing illustrates a preferred embodiment of the present invention. It shows:<dl tsize="7" compact="compact"><dt>Fig. 1</dt><dd>is a simplified schematic view of a CT system and a Mobile radio system, which by the method according to the invention operate combined in conjunction with a telecommunication network To ask a Einnummern service ready.</dd></dl>

WAYS OF CARRYING OUT OF THE INVENTION

Figure 1 illustrates in simplified form a mobile system 18 and a CT system 28, which fall be operated in combination with each other according to the method of the invention. The Coverage areas (not shown) of the two systems overlap at least partially. In the illustrated embodiment of the invention, the CT system 28 according to the DECT standard and the cellular mobile radio system 18 in accordance with the GSM standard, operated.

A fixed station 25 (Fixed Part) of the CT system 28 is connected via a terminal 22 and a LE 7 (Local Exchange, Office Center) stationary in a, usually wired Telecommunication network 10 connected. are In a mobile radio system or a GSM network 18 Base stations 15 via BSC 12 (Base Station Controller) 11 a MSC (Mobile Switching Center) of the GSM network 18 connected. The MSC 11, and thus the GSM network 18 are connected via a GMSC 9 (Gateway MSC) with the telecommunications network 10th The GSM network 18 may be connected to other telecommunication networks. Ans telecommunication network 10 are also connected a number of other participants. In the figure 1 is as an example of telephone 45 shown that through a terminal 42 to a LE 5 (Local Exchange or Transit Exchange) and thus connected to the telecommunication network 10.

A mobile telecommunication terminal 30 is for communication via a radio interface (air Interface) both with the CT system 28 and to the wireless system 18 equipped and is thus a DMT (Dual Mode Terminal). In the figure 1, the radio connections displayed with jagged arrows. When communicating with the Base station 25 of the DECT system 28 does the DMT 30 as a cordless phone (Portable Part) of the CT system 28, of communicating with the base station 15 GSM Netzs 18, it assumes the role of a mobile station of the mobile radio system 18th

The DMT 30 can be either in the coverage area of ​​the GSM Netzs 18, in Coverage area of ​​the CT system 28 or in an area of ​​the through none two systems is covered, lie.

1. First embodiment of the process

The MSC 11 of the GSM Netzs 18 may be between two different states of the DMT 30 distinguished: either the DMT 30 is the GSM network 18 "attached" (registered) or it is "detached" (not logged in). The DMT 30 has only one associated Base station 25 of CT system 28, with which it communicate over a radio interface can. If the DMT 30 determines that it is in the proximity of its assigned located base station 25, it tries to register with the base station 25th if the successful registration with the base station 25, the DMT signals 30 a "detach" operation the GSM network 18 from. This process is in the VLR 13 (Visiting Location Register) detained. If the DMT 30 the coverage area of ​​base station 25 leaves, tried to be "attach" process to register again at 18 GSM network in one. In the successful case, this is in turn held in the VLR.

The time required for the combined operation information whether the DMT 30 the GSM network 18 "Attached" (registered) or not, will be according to the invention by a query of the VLR 13 (triggered by an interrogation of the HLR 14 (Home Location Register)) from Toll 10 from be learned.

In this embodiment of the invention, a caller can from the telecommunication network 10 from, for example, 30 call the telephone 45, the DMT under a single personal number. These personal number can either have a geographical significance, eg number of the fixed terminal 22 (in this case, the LE (Local Exchange), of the Subscriber is connected, the Einnummern service unterstüzen) or may be a non-geographic number for this service to be (in this case, the IN function be (Intelligent Network) housed somewhere on the net). The telecommunication network 10 supports a service for the Einnummern operation by adding in a database of personal code number pair consisting of the GSM number of DMT 30 and the number of the terminal 22 of the DMT 30 associated base station 25 stored. The personal number may also with one of the latter two Numbers match. All telecommunication calls are the personal number initially routed to a control center that supports the Einnummern service. These has in addition to the access to the database in which the numbers are even Access to the additional information needed for the combined operation, namely, the information whether the DMT 30 at 18 "attached" GSM network (account) is or not.

The two main processes, namely a call from the telephone network 10 (eg, by phone 45) to the DMT 30 and a call from the DMT 30 ans network (eg to the telephone 45) can then be described as follows:

1.1 Call of the DMT 30 from

If the DMT 30 is the GSM network 18 "attached" (pending), is the case of a DMT 30 outgoing call attempts to connect to the desired terminal 42 build on the GSM network 18th

If the DMT 30 is registered with the CT system 28, is at a 30 from DMT outgoing call attempts to connect to the desired port 42 on the CT system 28 build.

If the DMT 30 outside the coverage area of ​​all systems is to which it has access, no connection can be established.

1.2 Call to the DMT 30

A call to the DMT 30 as the terminal 42 from the communication network 10 is a 5 LE (Local Exchange) routed, the caller belongs to. This LE 5 includes an SSP 4 (Service Switching Point). The SSP 4 solves the Einnummern service in a SCP 3 (Service Control Point) for this service from. The SCP 3 accesses the hard number assigned GSM number to and queries the HLR 14 from. The HLR 14 queries the VLR from 13, in which the final reports of the DMT are 30 saved.

If the DMT 30 is the GSM network 18 "attached" (pending), it tries to 30 establish connection to DMT over the GSM network 18th

If this fails (eg because the DMT 30 can not be achieved, although it is still the GSM network 18 "attached"), or when the DMT 30 at 18 GSM network "detached" is the call from the telephone 45 to the port 22 of the base station 25 is routed.

If in any of the above cases, a compound may be prepared, the routed call to a variant of the inventive method to a mailbox will.

1.3 Remarks to the first embodiment of the method

The method outlined above allows a combined operation of a GSM mobile radio system 18 with any of a CT system 28. For the implementation of a Einnummern service needs for each DMT 30 in a database merely an association the personal number to a number pair consisting of the GSM number of the DMT 30 and the number of the port 22 of the associated base station 25 be made. Needed for the combined operation of additional Information, namely the information whether the DMT 30 the GSM network 18 "attached" (Registered) or not, can use existing GSM functions and Procedures are queried. A combined operation of an existing CT system and an existing GSM mobile radio system according to this embodiment of the Invention can thus be established by an appropriate IN service (IN = Intelligent Network), which performs the above operations, is provided.

The solution according to the first embodiment of the invention described above supports Allerding only one associated CT system 28 for a DMT 30th

Next is no longer possible to select the port 22 of the base station 25 directly (Calls are routed always through the GSM network 18 as soon as the DMT 30 is turned on and it is outside the coverage area of ​​base station 25 of the CT system 28 is) if the personal number with the number of the fixed terminal matches. Note that the number of the DMT 30 is taken, as soon as it is moved away from the fixed station 25th

Once the GSM mode of the DMT 30 is turned off, phone calls are always at the Port 22 of the base station 25 is routed. There are several situations where this is undesirable, such as when the DMT 30 is switched off or outside the coverage area of ​​the two systems beifndet.

2. Second embodiment of the process

In a second embodiment of the inventive process that are above mentioned drawbacks of the first embodiment overcome. For Einnummern service according to this embodiment of the invention, the participants in the GSM network more Identities assigned (characterized by the IMSI (International Mobile Station Identity = internal network number) and the number MSISDN of DMT 30. Each of these Identities stands for a port to which the DMT has 30 Access: GSM terminal, Connecting a first CT system, connecting a second CT system, etc.

The basic principle of the method is that the DMT 30, the GSM network 18 via the connection information in which it is located just by to the this connection associated IMSI in the GSM network 18 in an "attach" operation logs.

If the DMT 30 determines that it is in the vicinity of a base station 25 of a CT system is, to which it has access, it tries to in this CT system register. If registration with the CT system manages the DMT reports 30 its previous identity from andin a "attach" operation with this CT system associated IMSI at 18 GSM network to new. This process is in the VLR 13 (Visiting Location Register) held. If the DMT 30 the coverage area of leaving the base station 25, it reverses the above steps, that is, it performs a "detach" with Associated to this CT system IMSI at 18 GSM network by and responds with of the GSM network belonging IMSI new member. This will in turn recorded in VLR. Thus, by a knowledge arises in the VLR about which port the DMT to Time is currently reachable. This knowledge can then again with the procedures of a IN service to be queried.

The two main processes, namely a call from the telephone network 10 (eg, by phone 45) to the DMT 30 and a call from the DMT 30 ans network (eg to the telephone 45) can then be described as follows:

2.1 Call of the DMT 30 from

A connection to a desired terminal 42 is currently on the active air interface is executed (for example, GSM, CT system 1, CT-2 system, etc.).

If the DMT 30 outside the coverage area of ​​the network is to which there is a Admission, has no connection can be established.

2.2 Call to the DMT 30

A call to the DMT 30 as the terminal 42 from the communication network 10 is a LE 5 (Local Exchange or Transit Exchange) routed, the SSP functionality supported. This LE 5 includes an SSP 4 (Service Switching Point). The SSP 4 solves the Einnummern service from a SCP 3 (Service Control Point) for this service. The SCP 3 accesses the associated to persönilchen number MSISDN to and queries the HLR 14 from. The HLR 14 queries the VLR 13 from (it can do this different VLR to be different numbers) in which the final reports of the DMT 30 stored, and receives in response at most a MSRN (Mobile Station Roaming Number). The answer to the other MSISDN will be that the participant with the corresponding MSIDDN is unreachable.

When the DMT is 30 at 18 GSM network with the GSM IMSI "attached" (registered) which the SCP 3 of the response from the HLR 14 detected (it is a MSRN supplied) attempting to establish a connection to the DMT 30 via the GSM network 18th

If the DMT 30 is registered with a IMSI of its associated CT systems, accesses the SCP to the associated subscriber number of CT fixed station to (number SN in The case of a PSTN or MSN in case of ISDN) and routes the call via the fixed network 10 (PSTN or ISDN) to the terminal 22 of the CT system. In a variant of the inventive method, the SCP 3 try parallel to the connection build via GSM using the MSISDN of the CT system.

If the above attempts to establish the connection does not succeed or if the DMT 30 is "detached" in the GSM network 18, can in a further variant of the the inventive method, the call is routed to a mailbox.

2.3 Remarks on the second embodiment of the method

As in the first embodiment also allows the second embodiment of the Process a combined operation of a GSM network 18 with a CT system 28, is operated by any standard, such as DECT, GSM-CTS, CT1, etc. For Connecting the base station or the base stations of the CT system can to a landline There are also no restrictions, they can, for example to a PSTN, ISDN or any other network connected. The only requirement for the inventive process is that the coverage area of ​​the mobile communications system 18 and the coverage area of ​​a CT system 28 are at least partially overlapping, namely, in the range over which the users in the coverage area of ​​the CT system enters. This is necessary so that the DMT 30 by registering the CT system can log out of the GSM network under its previous identity and in a "Attach" operation with the associated to this CT system IMSI at 18 GSM network can log on. It is to be noted that it is not necessary that the whole is covered coverage area of ​​the CT system by the GSM network (for example, in a building, in a basement, etc.) The requirement for combined Berieb therefore not very restrictive. It is at least much less restrictive than the Provided that the CT-stations have to be connected to an ISDN.

The present solution is completely based on existing GSM functions and Procedures. For a combined operation of an existing CT system and a existing GSM mobile radio system according to this embodiment of the invention is a Adaptation of mobile telecommunications terminals (DMT) and a simple extension of the SIM (Subscriber Identity Module) of a subscriber of the GSM network required to different IMSI and to save their relationship to the CT components.

Adding a new CT station requires Aufdatierung the SIM, what can be performed by an SMS message (SMS = Short Message Service) the SIM is sent.

Sometimes there is the user of DMT at the edge of the coverage area of ​​the CT system. In this case, the DMT tends between the CT system and the GSM network to switch back and forth. This can be prevented by changing the frequency of the down and forth switching is limited. As a result, the DMT can be used for some time in the GSM mode be locked, although this is not the preferred mode. In the present Solution for the combined operation of a DECT system with a GSM network, this Situation easily solved by an implicit shift: When the DMT on Edge of the coverage area of ​​a base station is CT, to which it has access, and it no longer is able to decode the paging messages reliably, there observed the paging messages from the GSM network. Because the power of the paging DMT both the CT system performs as well as GSM, according to this solution, the call if always possible routed via the CT system, a successful placement of the call ensuring and maintaining the data exchange for signaling purposes low.

Note that the parallel "paging" executed via the CT system and the GSM is to release the MSRN, which would otherwise be blocked for a considerable period would. For the future it is recommended that the HLR VLR procedures to a query of the type "Is the DMT attached?" to expand, which would assign no MSRN. In this case, could the "paging" substantially limited to the CT systems and only on the GSM be extended, if there is no page response from the CT system, which in the case a PSTN service connection would be determined by a "time-out".

According to the embodiment of the inventive method illustrated may any time the availability of a DMT 30 under all its possible physical addresses be requested from the GSM. Optionally, therefore, the caller immediately be communicated to his call that the DMT 30 is currently not reachable. He must, in Set contrast to today, not a whole lot of numbers in sequence and always let the phone ring a few times, until he finds the other party or not place.

In the illustrated embodiment of the process all phones with the same be Number - for example at home - ring when the DMT 30 within the is the coverage area of ​​the corresponding CT system 28th This is now common and not a problem. The service can be improved, however, by the case of a ISDN connection a "dedicated MSN" or in the case of a PSTN connection, a "class service" is used. Note that this is only to an improvement of the Einnummern service leads and is not needed for the functioning of the service.

The information needed for the combined operation, in which the SIM in the GSM the DMT 30 listed ports the DMT 30 is registered, According to the invention requested from the GSM mobile radio system 18th

In this embodiment of the invention, a caller can from the telecommunication network 10 from each Call the ports listed in the SIM of a DMT 30 in principle directly.

In the GSM network, the DMT leads 30 at certain intervals a so-called "periodic lation updating "process through, if this is required.

In summary, it should be noted that the invention provides a method for the provided the combined operation of a CT system and a mobile radio system is, wherein the additional information needed for the combined operation of the Mobile system to be queried. Thereby, a combined operation with CT systems enables the base station is not connected to a telecommunications system, which is provided for the exchange of digital data. In particular, allows inventive method the combined operation of a GSM system and a CT system, which is connected to an analog telephone network. In addition, provides one embodiment of the invention in case of a GSM mobile radio system in conjunction with a telecommunications network an easy way for the realization of a Einnummern service for the combined-powered systems