AU2008200801A1 - Process and device to identify a mobile user in a digital cellular mobile radio network - Google Patents

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION Standard Patent Applicant(s): THALES Defence Deutschland GmbH Invention Title: PROCESS AND DEVICE TO IDENTIFY A MOBILE USER IN A DIGITAL CELLULAR MOBILE RADIO NETWORK The following statement is a full description of this invention, including the best method for performing it known to me/us: -1o00 Process and device to identify a mobile user end device in a digital c cellular mobile radio network c 5 The present invention describes a process for the identification of a mobile user end device in a digital cellular mobile radio network through which data are transmitted according to a CDMA (Code Divisional Multiple Access) o00 0process. In addition, the invention describes a simulator for the identification c of a mobile end device in a digital cellular mobile radio network through which oo 00 0 10 data are transmitted in a CDMA (Code Divisional Multiple Access) process.

Security forces have among other matters the assignment to solve crimes that have already been committed and or to prevent crimes from occurring. An important factor in fulfillment of these assignments is the ability in specific situations to identify a suspect on the basis of mobile telephone use and to listen in on, record, and evaluate conversations that the person holds over the mobile telephone. The security forces are empowered to do this through relevant legal ordinances and regulations. The goal is to gather the communication traces of a suspect in order to identify the person and or the mobile telephone that was used and to record and evaluate the conversations that were held.

In the state of the art various mobile radio networks for the transmittal of data are known. Very widespread in use, both in terms of network coverage as also in terms of the number of mobile user end devices, are GSM (Global System for Mobile Communications) mobile radio networks. For the past few years UMTS (Universal Mobile Telecommunications System) mobile radio networks have been available and are becoming increasingly widespread.

These two standards differ from each other for example in authentication, protection of integrity, and encrypting. While in GSM only the mobile user end device is required to authenticate itself over a base station, UMTS also requires that the base station authenticate itself with the mobile user end -2o00 0 device. In the context of the protection of integrity in UMTS, the directing data C that need to be transmitted over the mobile radio network are for example a protected by signatures against tampering. In order to encrypt the data that are to be carried over the mobile radio network, special encrypting processes are implemented for UMTS, such as for example the Kazumi process. The UMTS encryption relates both to the user data as well as the direction data.

While a GSM mobile radio network implements a combination of frequency 00oo Smultiplex processes (FDMA Frequency Divisional Multiple Access) and time 0 multiplex processes (TDMA Time Divisional Multiple Access) for the oo transmittal of data, a UMTS mobile radio network utilizes a code multiplex Sprocess (CDMA Code Divisional Multiple Access) in which the data (signals) are transmitted to several sources or senders at the same time. In this case the data are assigned specific code patterns (so called Scrambling Code).

In addition there is for example a process, that is known according to DE 199 222 Al, for identification and listening in on a mobile user end device in a digital cellular GSM mobile radio network. On the basis of the above noted examples and not complete listing of differences between a GSM mobile radio network and a mobile radio network, in which the data are transmitted according to the code multiplex process, as for example in a UMTS mobile radio network, the processes known for GSM networks cannot be easily transferred to UMTS networks.

The technical specification ETSI TS 133 108 V6.8.2 (3GPP TS 33.108 version 6.8.2 Release 6) from January 2005 describes very broadly the general technical requirements for UMTS handover interfaces, which allow "lawful interception" a feature defined for UMTS networks. This feature must be realized in all technical equipment of public communication networks. It gives public institutions the possibility to dial up on existing UMTS connections and to listen in on conversations held over these connections. If the provisions described in this document were not fulfilled in UMTS networks, the -3o00 O identification and the listening in on user end devices would not be possible c right from the start due to missing technical requirements.

WO 2005/011 318 Al describes how a simulator introduced into a GSM radio cell for listening in on conversations held over a mobile telephone and operated as a virtual base station only accepts registration of the to be 0listened on user end device and rejects the registration of other user end 00oo devices. The objective is to reduce the load of the virtual base station caused 0 by other user end devices during the listening in on the to be listened on user oO 1 o end device. For achieving this objective the virtual base station can transmit c rejection signals to user end devices, which try to register with the virtual base station.

The present invention seeks to develop a way to identify a mobile telephone in a mobile radio network in which data are transmitted according to a code divisional multiple access (CDMA) process, in particular a UMTS mobile radio network, and where needed to also listen in on conversations held over the mobile telephone.

The solution of this task comprises a process for the identification of a mobile user end device in a digital cellular mobile radio network through which data are transmitted according to a first protocol, comprising the following steps all carried out in the realm of the first protocol: in proximity to a user end device to be identified a simulator is arranged; a measurement system determines in proximity to the simulator parameters of the base stations relevant for the transmission of data and transfers the relevant parameters to the simulator; the simulator is operated as a new base station taking into consideration the obtained parameters; the to be identified user end device recognizes the simulator as a new base station and registers itself there; -4- 00 O an authentication procedure is commenced, the to be identified user Cl end device rejects the authentication procedure as erroneous, the Ssimulator begins an identification procedure in the course of which the simulator asks the to be identified user end device for its s identification parameters, the simulator receives the identification parameters of the to be identified user end device, and O- the user end device is identified in the realm of the first protocol on 00 Othe basis of the transmitted identification parameters.

00 As per the invention, processes are proposed through which relevant Cl parameters of mobile radio network base stations in close proximity to a simulator can be located for the data transfer and can be drawn on. In this case the simulator is in close proximity of the to be identified user end device; that is, that it is arranged within the radio cell in which the user end device is registered. The located parameters include in particular the scrambling codes and or the transmission strengths of the base stations that are used by the base stations that are arranged in proximity to the simulator. The scrambling code is a code pattern, with which the various transmitters are coded within the frame of a code multiplex process for the transmission of data. At that point the simulator is operated as a new base station selectively with a different Location Area Code than the original base station in which the identified user end device was originally registered. For this purpose, the simulator has access to necessary means, for example a base station which enables the operation of a simulator as a base station in a mobile radio network.

In addition the simulator sends system information in fact within the same frequency band as the original base station, though at a higher transmission power than the original base station. The emission of another Location Area Code (LAC) simulates to the to be identified user end device a movement of the user end device in a new spatial area to which the other LAC is assigned.

However, the same objective can also be achieved if the simulator sends data 00 0 with the same LAC as the original base station but with a higher power than c the original base station, or at least with a power which makes the to be a identified user end device to receive the data from the simulator with a higher Spower than the data received from the original base station. In this way the user end device is compelled to make an automatic registration with the simulator. For this purpose the user end device performs a so called Location 0Update.

0 0 On the basis of the identification parameters, the identification of the user end 0 device can take place. The identification parameters include for example an SIMSI (International Mobile Subscriber Identity), a TMSI (Temporary Mobile Subscriber Identity), P-TMSI (Packet TMSI) and or an IMEI (International Mobile Equipment Identity). These identification parameters are sufficient to adequately develop a connection between the simulator and the to be identified user end device for the purpose of listening to the conversation being held over the user end device. For this purpose the simulator has available sufficient means, for example a user end device which permits the operation of the simulator as a user end device for the development of a connection to the to be identified user end device and for monitoring the connection and or the conversation.

According to a preferred method of the invention, the measurement system is designed as a monitor-user end device which can be a part of the simulator.

Because user end devices transmit regardless of the relevant parameters of base stations in the mobile radio network in close proximity to the user end device needed for data transmissions, measurement systems based on the ideas of the invention can be employed.

The actual name and the personal data of the user of the user end device are registered with the operator (known as a provider) of the mobile radio network and can be requested from it in the context of an official inquiry. Only the provider has access to cross-reference lists that enable the attribution of the 00 IMSI to a user and or of the IMSI to a call number. The TMSI is as the C name itself points out only of a temporary nature and does not permit a Sclear attribution to a particular user or to a particular call number. For this Sreason, it is important that not only the TMSI but also the IMSI be available.

c-I If the to be identified user end device transmits, at identification to the 0 simulator, only the TMSI (Temporary Mobile Subscriber Identity) as the 00 Sidentification parameter, then the authentication procedure can begin. If the 0 to be identified user end device however expects an authentication procedure, 00 then it is proposed according to the further advantageous embodiment of the Sinvention that after the registration of the user end device with the simulator an authentication procedure is commenced; the to be identified user end device rejects the authentication procedure as erroneous; the simulator again begins an identification procedure in the course of which the simulator asks the to be identified user end device for its IMSI (International Mobile Subscriber Identity) or IMEI (International Mobile Equipment Identity); and the simulator receives the IMSI or the IMEI of the to be identified user end device.

According to this further embodiment initially an authentication procedure is started. However because the simulator, and or the new base station, cannot identify themselves as being part of the simulator (which is required however in UMTS networks), the to be identified user end device rejects the authentication procedure as erroneous, for example on the basis of a MAC error. Thus the simulator begins the identification procedure, through which the to be identified end device simulates an impression that the new base station (which is in fact a part of the simulator itself) requires, for identification purposes, the identification parameters IMSI or IMEI) of the to be identified user end device. Thereafter the user end device transmits its IMSI 00 or IMEI to the simulator on the basis of which a clear identification of the user cl end device is possible.

According to a preferred embodiment of the invention, it is proposed that the attempt to register with the simulator by the user end device to be identified, after the user end device has recognized the simulator 0as a new base station, be rejected or the connection between the 00oo user end device and the new base station be interrupted and or N disrupted by some other means; and 00oo o on the basis of a protocol to be used in the mobile radio network for the transmission of data the user end device be compelled to automatically register at another base station of another radio cell of another mobile radio network for the transmission of data according to another protocol.

As an advantage the to be identified user end device is forced upon rejection of the registration attempt into the mobile radio network to automatically register with a base station of a GSM (Global System for Mobile Communication) radio cell. Primarily the telephone conversations held over the identified user end device and the GSM radio cell are listened to with the aid of common listening methods for GSM mobile radio networks.

Upon successful identification of the user end device, the user end device is thus pointed to a conventional GSM mobile radio network. This can take place for example through defined information elements through interference (so called jamming) of the UMTS connection, or through other suitable means.

Upon a disruption or interference of the UMTS connection, the user end device is directed to create a connection over an alternative mobile radio network, particularly over the GSM network, on the basis of the protocol used for the data transmission in the mobile radio network. This takes place for example in the context of a so called "Cell Reselection" procedure.

-8o00 Following the development of the connection to the GSM network, the entire Ci conversation process in the user end device proceeds in the usual manner Saccording to the GSM standard. In order to listen to the conversations, usual processes can be applied such as for example those that are known from DE S 5 199 20 222 Al. Reference is specifically made to this document in regard to the known methods for listening into a user end device in a GSM network. In 0this respect the content of this document is incorporated herein by reference.

00oo 00 According to another advantageous embodiment of the present invention it is oo proposed that following the identification of the user end device S- by means of a monitor user end device the determined identification parameters and the security capabilities of the identified user end device be transmitted to a real base station of the mobile radio network; the real base station sends back RAND (random number) and AUTN (authentication token) to the monitor user end device; the simulator interrupts the connection to the real base station of the mobile radio network; the simulator is operated as an other base station of an other radio cell of a GSM mobile radio network and builds a connection to the identified device; an authentication procedure is initiated between the identified user end device and the simulator; and where the authentication procedure is successfully terminated, the simulator causes the identified user end device not to use encryption in the subsequent data transmission.

The simulator establishes upon interruption of the connection to the real base station of the mobile radio network another connection to the identified user end device over a base station of a GSM (Global System for Mobile Communication) radio cell.

-9o00 O The monitor user end device is a preferred part of the simulator. The RAND c and AUTN number sets that the simulator obtains from a real base station of a the mobile radio network involve parameters that are required in UMTS for the authentication of a base station in relation to a user end device. The monitor user end device simulates a real base station, in other words a desired connection, and causes the real base station to thus transmit RAND and 0AUTN to the simulator. From the point of view of the real base station, the 00oo Ssimulator is a real user end device. It is only possible with the assistance of 0 the RAND and AUTN parameters to establish a conversation connection oo between a base station and an identified user end device that is to be listened c to.

The establishment of a connection to the user end device that is to be listened to proceeds on the basis of a simulated GSM base station of a GSM radio cell of a GSM mobile radio network. The simulated GSM base station is preferably part of the simulator. Following successful authentication, the simulated GSM base station sends security parameters to the user end device that is to be listened to. The security parameters encompass, among other things, a command to the user end device, to operate without encryption (the so-called "No Encryption" parameter); that is, to transmit non-encrypted data.

The proposed concept according to this embodiment works with two different mobile radio networks, namely the UMTS and the GSM networks. For this reason, the to be listened to user end device must be a Multi-Radio-Mode user end device which supports several differing mobile radio networks, namely UMTS and GSM networks. The concept encompasses a simulated GSM base station, a simulated UMTS base station, and a monitor user end device. The delay periods between the access to the authentication parameters and the suppression of the encryption should be as short as possible in order to prevent the real UMTS network from sending new RAND 00 and AUTN prior to the encryption suppression. The delay periods should be c in the realm of a few seconds, maximally within a minute.

As a further solution to the problem of the present invention, beginning with a simulator for the identification of a mobile user end device in a digital cellular mobile radio network of the type described at the beginning herein, is a simulator characterized by 00 a measurement system for obtaining, from base stations located in C the spatial proximity, parameters relevant for the transfer of data to 00 the simulator; means of operating the simulator as a new base station while taking into consideration the obtained parameters, however with a different Location Area Code (LAC); and means for identifying the user end device on the basis of transmitted identification parameters.

As a preferred method the measurement system is designed as a monitor user end device.

According to a preferred embodiment of the present invention it is proposed that the simulator feature means for the execution of the processes according to the invention.

According to another aspect of the present invention, a process is suggested for the execution of gathering or manipulating access to a mobile user end device in a digital cellular mobile radio network through which data are transferred according to a primary protocol. The gathering or manipulating of access to the user end device comprises an interception, a determination of bearings and a locating of the user end device. What is proposed is that the end device be initially identified by some process in which it is located using an IMSI (Intemrnational Mobile Subscriber Identity) contained on a SIM (Subscriber Identity Module)-Card or by an IMEI (International Mobile -11 oo00 0 Equipment Identity) assigned to the user end device. The entire identification c of the user end device occurs within the environment of the digital cellular mobile radio network through which the data are transferred according to the first protocol (for example UMTS protocol). The identification begins with the c 5 operation of the UTRAN simulator within the mobile radio network as a virtual base station so that the to-be-identified user end device registers there and it 0ends with the determination of IMEI and or IMSI. Thereafter the identified 00oO 0user end device is redirected to another mobile radio network for the C execution of the gathering or manipulating accesses through which data are oo 00 transferred according to a second protocol (for example, GSM protocol). In c this manner generally known processes can be relied on for the interception, determination of bearings or locating of the identified user end device.

Without limitation to functionality, the capturing or manipulating access to the user end device can rely on existing mechanisms and tools.

Preferably the gathering or manipulating of access to the mobile user end device comprises a determination of bearings or a locating of the user end device. This takes place for example when information relating to the user end device, and especially information by which the position of the user end device can be determined, is transmitted to the UTRAN simulator. This information is preferably values for the field strengths with which the user end device receives signals from visible base stations of the mobile radio network.

By recognizing the network topology, especially of the position of the base stations, the bearings of the user end device can be determined and or it can be located. While the determination of bearings solely comprises the determination of the user end device's direction, the locating shall also consist of a determination of the distance to the end device. Alternatively or additionally, information that is obtained via a satellite based positioning system (for example, Global Positioning System, GPS) relating to the position of the user end device can be transmitted from the user end device to the UTRAN simulator. This GPS information can be utilized on its own to locate -12oo00 O the user end device or it can be used to correct the position of the user end c device established via the field strengths of the received signals.

a A preferred design example for the invention is more closely shown in the Sfollowing discussion with reference to the figures. They show: cI Figure 1 a simulator according to the invention for the identification of a mobile user end device in a digital cellular mobile radio network o00 Saccording to a preferred design form; 00oo Figure 2 a depiction of a UMTS radio cell with differing Location Area Codes; Figure 3 a flow chart of a process according to the invention for the identification of a user end device according to a primary design form; Figure 4 a flow chart of a process according to the invention for the identification of a user end device according to a second design form; and Figure 5 a flow chart of a process according to the invention for listening to a user end device according to the preferred design form.

Security forces have, among other matters, the assignment to solve crimes that have already taken place and or to prevent crimes from occurring. An important aspect in fulfilling these assignments is the ability in specific well grounded situations to identify a suspect on the basis of mobile telephone use and to listen in on, record, and evaluate conversations that the person holds over the mobile telephone.

There are various mobile radio networks for the transmission of data. Very widely used in terms of network coverage as well as in terms of the number of mobile user end devices in use are GSM (Global System for Mobile Communications)- mobile radio networks. For the past several years UMTS (Universal Mobile Telecommunications System) mobile radio networks have -13- 00 0 become more available and increasingly used. Both standards differ for c example in authentication, integrity protection, and encryption. A further a difference is that in UMTS a so-called Code Division Multiple Access (CDMA) process is employed while in GSM a combination of Frequency Division Multiple Access and Time Division Multiple Access (FDMA/JTDMA) processes are relied upon. On the basis of these significant differences, the processes 0and devices used for the identification and listening to a mobile user end 00 0device cannot be carried over to UMTS networks.

00 The present invention proposes for the first time a process through which at C site identification and listening of user end devices belonging to suspects is possible even in UMTS mobile radio networks.

A device is shown in Figure 1 for executing the process according to the invention. The device appropriate to the invention is a so called UTRAN (UMTS Terrestrial Radio Access Network) simulator. The simulator 1 includes a simulated UMTS base station 2, which is designated as NodeB, and a simulated monitor user end device 3, which works according to the UMTS standard and is designated as Monitor UE (User Equipment). In addition the simulator 1 includes an RNC (Radio Network Controller) functionality 4.

Between the simulated NodeB 2 and the RNC-functionality 4, a so called lub intersection 5 is provided. In addition, a directing and service calculator 10 is provided which directs the steps of the process according to the invention.

In addition, the simulator 1 includes a simulated GSM base station 12 which is designated as a base station (BS) and a simulated GSM end station 13, which works according to the GMS standard. The simulated UMTS user end device 3 and the simulated GSM user end device 13 can be incorporated into a single unit. This is easily possible because the UMTS user end device normally include a GSM functionality in order to ensure a secure and reliable connection in areas with insufficient UMTS coverage. In any case the simulator 1 includes a BSC (Base Station Controller) functionality 14.

-14- 00 0 Between the simulated BS 12 and the BSC functionality, an intersection 15 is cI provided.

In addition an external measurement system 11 is provided which measures the parameters relevant for UMTS of the base stations in the vicinity of simulator 1. Naturally the measurement system 11 can also be integrated into 0the simulator 1. A UMTS monitor user end device 3 is preferably used as the 00 0 measurement system 11 so that no additional measurement systems are N required. The measurement system 3 and I or 11 establish an overview of the (0 cellular UMTS environment which is then transmitted to the UTRAN simulator S1.

The simulator 1 is engaged for the implementation of the process in a real UMTS environment which includes a real base station (NodeB) 6 and a real user end device (UE) 7. Naturally there can be more base stations in the UMTS environment than the illustrated base station 6 and more user end devices than the illustrated user end device 7. The user end device 7 is the to be identified and possibly to be listened to user end device and is designated as the Target-UE. An optional UMTS user end device becomes, according to the terminology used herein, a Target-UE 7 when it is registered (also partially) or has been booked in the UTRAN simulator 1. Between the real user end device 7 and the simulated NodeB 2, a Uu air intersection 8 is provided. Between the simulated end device 3 and the real NodeB 6 a further air intersection 9 is provided.

In figure 2 a cellular UMTS mobile radio network is represented that comprises many radio cells 120-128, 130-133. Some of the radio cells 120- 128 belong to a first so called Location Area whereby all radio cells are attributed to the same Location Area Code (LAC) (for example LAC=1000).

Other radio cells 130-133 belong to a second location Area whereby all radio cells 130-133 are attributed to the same Location Area Code (for example LAC=2000) which differs from the first Location Area Code. Base stations 00 0 (NodeBs) cover one or more of the radio cells (120-128), 130-133. The base c stations are however not shown in order to preserve the clear arrangement of SFigure 2.

CI 5 Figure 3 shows a flow chart of the process according to the invention for the identification of the end device 7. The process begins in a function block The simulator 1 is attributed to the spatially near to the to be identified UMTS 00 user end device 7 in a UMTS network (function block 21). The UTRAN c simulator is operated in one of the geographic radio cells 120-128, 130-133 in 00 0 10 which the base station is booked on the to be identified user end device 7. It c is possible that the user end device 7 is booked together with other user end devices on the base station. With the measurement system 3, 11; the base stations surrounding the simulator 1 with parameters relevant to UMTS are measured in a function block 22 and or captured by some other method and transmitted to the simulator 1. These parameters include for example so called Scrambling Codes of the radio cells 120-128, 130-133, the transmission power of the base stations, the identification parameters of NodeBs, and systems information.

In a function block 23, the UTRAN simulator 1 sends on its part system information in the same frequency band as the neighboring base stations but with higher transmission power so that the user end devices located spatially near to the simulator 1 (and thereby also the to be identified user end device 7) are recognized by the simulator I as new (simulated) base stations.

Furthermore the simulator 1 transmits with a different Location Area Code (for example LAC=3000) so that the spatially near to the simulator 1 located user end devices (and thereby also the to be identified user end device 7) obtain the impression that they have moved spatially into a new area with a new LAC.

The LAC of the simulated base station 2 is selected in such a manner that it is not used by the regular base stations 6 in the vicinity of the simulator 1.

-16oo00 0 A so called location update procedure is initiated thereby in these user end N devices (and thus also in the to be identified user end device 7) within the scope of which the user end devices register with their identification parameters at the simulated base station 2 (function block 24). The identification parameters include for example a IMSI (International Mobile Subscriber Identity), a TMSI (Temporary Mobile Subscriber Identity) and or an IMEI (International Mobile Subscriber Identity). On the basis of these 00oo 0identification parameters the identification of the user end device 7 thus takes N place in function block 25. The process for the identification of the user end oo 0 10 device 7 ends in a function block 26. The simulated spatial region with a new c LAC is shown in a figure 2 via reference indicator 140.

The actual name and the personal data of the user end device 7 user are registered with the operator (so called provider) of the mobile radio network and can be accessed there possibly in the scope of an official investigation or through other methods. Only the provider has at its disposal the so called Cross-Reference lists which enable the attribution of the IMSI to a user and or of the IMSI to a call number. The TMSI is as the name already indicates only temporary in nature and permits thus no clear attribution of a specific user or a specific call number. For this reason it is important that the IMSI or the IMEI and not the TMSI be present.

In the event the to be identified user end device 7 is transmitted upon registration with simulator 1 in function block 24 only with the TMSI (Temporary Mobile Subscriber Identity) as an identification parameter and waits for an authentication procedure, the invention can be supplemented according to the process flow chart in Figure 4 such that subsequent to the registration of the user end device 7 with the simulator 1 in a function block 27 the authentication procedure is started. However because the simulator 1 and or the simulated base station 2 cannot identify itself as part of the simulator 1 in relation to user end device 7 (which is actually not required in UMTS networks), the to be identified user end device 7 rejects in a function -17oo00 block 28 the authentication procedure for example on the basis of a MAC c1 error. Thus the simulator 1 starts on its part in a function block 29 an Sidentification procedure whereby the to be identified user end device received a simulated impression 7 that simulated base station 2 requires the IMSI of the to be identified user end device 7 for reasons of identification. Thereupon the user end device 7 transmits in a function block 30 its IMSI to the simulator 1 on the basis of which the clear identification of the user end device 7 is 00oo possible within the function block 25. The process ends in function block 26.

00oo Subsequent to the identification of the target user end device 7 according to the processes in figure 3 and figure 4, conversations received on or sent from the user end device 7 can be listened to by various methods. According to a first embodiment the flow chart of which is illustrated in Figure 5, the process to listen in on the user end device 7 begins in a function block 40. In a function block 41 the identification of the user end device 7 takes place. The block 41 thus includes all process steps 20 to 26 of Figure 3 and/ or 20 to of Figure 4. Thereupon the Location Update procedures of the user end device 7 are rejected by the simulator 1 and or the simulated base station 2 in a function block 42.

At this point the user end device 7 registers in a function block 43 according to a so called Cell Reselection procedure over the simulated GSM base station 12 in a GSM radio cell of a GSM network. UMTS user end devices must also be able according to their standard to be used in a GSM network. The rejection of a target user end device 7 by the UMTS network in the GSM network can take place by various methods. Thus the rejection can occur for example through a command (a predetermined information) which is transmitted over a so called BCCH (Broadcast Control Channel). Alternatively, the rejection can also take place through optional information which is transmitted over the so called FACH (Forward Access Channel) or the so called DCCH (Dedicated Control Channel). The UTRAN simulator that is located in the UMTS user end devices contain this command (this -18- 00 0 information) and book themselves into an existing GSM network. One can c imagine that the connection to the UMTS network can be restricted by other a means for example through disruption (so called jamming) and can in the end be terminated.

cI All conversations that are received or sent over the target user end device 7 are now no longer carried over the UMTS network but over the GSM network.

00 SMore specifically the conversations are carried over the simulated GSM base c station 12, the simulated GSM user end device 13, and further to a real GSM 00 base station 16. In a function block 44 the conversations can be listened to c over a target user end device 7 in the GSM environment as it has been disclosed for example in DE 199 20 222 Al. The process then ends in a function block Naturally it is also possible to listen in to the conversations held over the target user end device 7 but also to perform already the identification of the user end device 7 in the GSM environment with conventional means. Thus even before the Location Update procedure is ended, it is diverted from the UMTS network to the GSM network and its IMSI and IMEI identity parameters are captured there in the GSM environment by means of known processes.

Furthermore at that point a further manipulation of the target user end device 7 is possible.

It is also possible according to the present invention to listen to conversations held over the target user end device 7 through a so called Quasi-Transparent process. For this it is required that the simulator 1 initially obtain security information from the real UMTS base station 6 and then build with this information a connection between a simulated GSM base station 12 and the user end device 7. In addition, with the aid of the identification parameters of the end user device 7 obtained prior thereto in the context of the identification, a connection needs to be built from the GSM user end device 13 to the real GSM base station 16. Conversations from or to the target user end device 7 -19- 00 O are now no longer held directly to the real base station 6 and I or 16, but only N indirectly over the UTRAN simulator 1. The listened to conversations can be recorded in full or in part in simulator 1 for example for later evaluation or evidentiary requirements. Furthermore the conversations are mandatorily cI 5 directed over the GSM network and not over the UMTS network even if sufficient UMTS coverage exists.

00 00 0O

Claims (17)

1. 2. Process according to claim 1, characterized in that the registration attempt of the to be identified user end device is rejected at the simulator after the identification procedure or the connection -21 oo00 between the user end device and the new base station is c interrupted or disrupted by other means, the user end device is forced to automatically register with another base station of another radio cell of an alternative mobile radio network through which the data are transmitted according to a second protocol that differs from the first protocol, the to be identified user end device transmits its identification parameters within the range (realm) of the second 00 ~protocol in the context of a registration with the alternative mobile c radio network, and the simulator receives the identification oo 00 S 10 parameters of the user end device c-i
2. 3. Process according to claim 2, characterized in that after identification of the user end device it is denialed to the alternative mobile radio network, through which the data are transmitted according to a second protocol that differs from the first protocol, for the purpose of an interception, a determination of bearings, and or a locating.
3. 4. Process according to claim 1, characterized in that in the mobile radio network a UMTS protocol is used as the first protocol. Process according to claim 1, characterized in that in the alternative mobile radio network a GSM protocol is used as the second protocol.
4. 6. Process according to claim 1, characterized in that the measurement system (11)determines Scrambling Codes, operating frequencies, or transmission strengths used by the surrounding base stations to be the relevant parameters for data transmission.
5. 7. Process according to claim 1, characterized in that the to be identified user end device transmits upon registration with the simulator or in the context of the identification procedure at least -22- 00 one of the following identification parameters to the simulator C IMSI, TMSI, P-TMSI and IMEI.
6. 8. Process according to claim 7, characterized in that if the to be identified user end device transmits upon registration with the simulator solely the TMSI as the identification parameter, an identification procedure is started and upon rejection by the 00 to be identified user end device c i. an authentication procedure is started; 00 S 10 ii. the to be identified user end device rejects the N authentication procedure as erroneous; the simulator starts again an identification procedure during the course of which the simulator calls for the to be identified user end device's IMSI or IMEI; and the simulator receives the IMSI or the IMEI of the to be identified user end device
7. 9. Process according to claim 1, characterized in that the simulator (1) transmits in the same frequency band yet at a higher performance than the base stations in the proximity of the simulator Process according to claim 1, characterized in that the simulator (1) is operated in the same or in a spatially proximately located geographical radio cell (120-128, 130-133), in the base station of which the to be identified user end device was originally registered (booked in).
8. 11. Process according to claim 1, characterized in that the to be identified user end device is fooled by the presence of the simulator operating as the new base station simulating a movement of the user end device into a new spatial field that is assigned another Location Area Code and, on the basis of the first -23- 00 protocol that is used in the mobile radio network for the transmission c of data, and as a result of the first protocol that is used in the mobile a radio network for the transmission of data, the user end device is forced to automatically register with the simulator c-I
9. 12. Process according to claim 1, characterized in that by means of a monitor user end device the determined 00 Sidentification parameters and the security capability of the 0identified user end device are transmitted to a real base 00 station of the mobile radio network; N- the real base station sends back to the monitor user end device a random number and an authentication token; the simulator interrupts the connection to the real base station of the mobile radio network; the simulator is operated as a different base station (12) of another radio cell of a GSM-mobile radio network and builds a different connection to the identified user end device an authentication procedure is started between the identified user end device and the simulator and provided the authentication procedure ends successfully, the simulator causes the identified user end device not to use any encryption during the subsequent data transmission.
10. 13. A simulator arranged in spatial proximity to a to be identified mobile user end device for the identification of the mobile user end device in a digital cellular mobile radio network, through which data are transmitted according to a first protocol, comprising: a measurement system (11) for the determination of the relevant parameters for the data transmission of base stations of the mobile radio network in spatial proximity to the simulator -24- 00 S- means for operating the simulator as a new base station Sin the mobile radio network subject to the determined d parameters; means for receiving identification parameters of the to be identified user end device during the registration of the user end device with the simulator whereby i. an authentication procedure is started, the to be identified 00 Suser end device rejects the authentication procedure as 00erroneous, the simulator starts an identification (0 procedure during which the simulator calls the to be identified user end device for its identification parameters and the simulator receives the identification parameters of the to be identified user end device and means (10)for the identification of the user end device within the field (realm) of the first protocol on the basis of the transmitted identification parameters.
11. 14. Simulator according to claim 13, characterized in that the simulator comprises means to reject the registration attempt of the to be identified user end device with the simulator after the identification procedure or to interrupt or to disrupt the connection between the user end device and the new base station in a different manner, whereby the user end device is accordingly forced to transmit for an automatic registration at another base station of another radio cell of an alternative mobile radio network through which data are transmitted according to a second protocol that differs from the first protocol, the to be identified user end device transmits its identification parameters within the field (realm) of the second protocol in the course of the registration with the alternative mobile radio network, and the simulator comprises means (12) for receiving the identification parameters of the to be identified user end device 00 Process to execute the gathering or manipulating of access to a c mobile user end device in a digital cellular mobile radio network a through which data are transmitted according to a first protocol, comprising Sthe following steps: the user end device is identified by determination of the IMSI (International Mobile Subscriber Identity) contained on a SIM 0 (Subscriber Identity Module) card or of a IMEI (International 00 0 Mobile Equipment Identity) assigned to the user end device, 0 whereby the entire identification occurs within the range of the digital cellular network in which the data are transmitted according to the first protocol, and the mobile user end device upon the identification of the mobile user end device is directed toward processing the gathering or manipulating of access in a different mobile radio network by transmission of the data according to a second protocol.
12. 16. Process according to claim 15, characterized in that the first protocol is a Universal Mobile Telecommunications System (UMTS) protocol.
13. 17. Process according to claim 15, characterized in that the first protocol is a Global System for Mobile Communications (GSM) protocol.
14. 18. Process according to claim 15, characterized in that the gathering and manipulating of access to the mobile user end device comprises a determination of the bearings or a locating of the user end device
15. 19. Process according to claim 15, characterized in that the gathering or manipulating of access to the user end device (7) -26- 00 O comprises of a transmission of information relating to the user Send device C4 Process according to claim 19, characterized in that within the realm of the information transmission, information relating to the actual position of the user end device is transmitted. 00
16. 21. Process according to claim 20, characterized in that values for 00the field strengths are transmitted by which the user end device (0 receives signals from visible base stations belonging to the mobile radio network.
17. 22. Process according to claim 20, characterized in that information relating to the position of the user end device is transmitted by means of a satellite based positioning system