WO2010057539A1 - Procédé et appareil d'acquisition d'un imei associé à un imsi - Google Patents

Procédé et appareil d'acquisition d'un imei associé à un imsi Download PDF

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Publication number
WO2010057539A1
WO2010057539A1 PCT/EP2008/066095 EP2008066095W WO2010057539A1 WO 2010057539 A1 WO2010057539 A1 WO 2010057539A1 EP 2008066095 W EP2008066095 W EP 2008066095W WO 2010057539 A1 WO2010057539 A1 WO 2010057539A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
identity
node
imei
isup
Prior art date
Application number
PCT/EP2008/066095
Other languages
English (en)
Inventor
Rogier August Caspar Joseph Noldus
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/EP2008/066095 priority Critical patent/WO2010057539A1/fr
Priority to EP08875359.5A priority patent/EP2368355B1/fr
Priority to CN2008801320495A priority patent/CN102224725A/zh
Priority to US13/130,012 priority patent/US9112962B2/en
Publication of WO2010057539A1 publication Critical patent/WO2010057539A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2281—Call monitoring, e.g. for law enforcement purposes; Call tracing; Detection or prevention of malicious calls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H04L63/1416—Event detection, e.g. attack signature detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/30—Network architectures or network communication protocols for network security for supporting lawful interception, monitoring or retaining of communications or communication related information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/12—Detection or prevention of fraud
    • H04W12/126—Anti-theft arrangements, e.g. protection against subscriber identity module [SIM] cloning

Definitions

  • the invention relates to a method and node in a telecommunications system, and in particular to a method and node for providing the identity of a first user equipment to a second user equipment in the telecommunication system.
  • a law enforcement agency is defined as a body that is authorised by law to carry out telecommunication interceptions, i.e. a particular communication involving a particular target.
  • a law enforcement agency may monitor any one of a number of different identities that might be assigned to a target, for example the international mobile equipment identity (IMEI) of a target, international mobile subscriber identity (IMSI) and/or mobile station international ISDN number (MSISDN).
  • IMEI international mobile equipment identity
  • IMSI international mobile subscriber identity
  • MSISDN mobile station international ISDN number
  • the IMEI for example, is defined in the 3GPP standard TS 23.003.
  • the structure of the IMEI includes a Type Allocation Code (TAC) comprising 8 bits, a Serial Number (SNR) comprising 6 bits and a spare digit.
  • TAC Type Allocation Code
  • SNR Serial Number
  • a law enforcement agency may therefore, under lawful instruction, monitor a communication network for communication that is established through a particular user equipment device, i.e. using the serial number of that target device which is contained within the IMEI.
  • a lawful intercept may be ordered for that IMEI.
  • the technical requirements for performing a lawful intercept are defined in 3GPP standards TS 42.033 and TS 43.033, plus the ETSI standard TS 101 671 relating to the handover interface for the lawful interception of telecommunications traffic.
  • a problem with performing this type of lawful interception on a particular target device is that the IMEI (or similar identity) of the target device must be known in the first place, so that the IMEI can be monitored prior to performing the lawful interception.
  • a method in a node of a telecommunication system comprises the steps of: receiving a call establishment request between a first user equipment and a second user equipment; acquiring the identity of the second user equipment; and providing the identity of the second user equipment to the first user equipment.
  • the method may further comprise the step of determining whether the first user equipment is subscribed to a service that allows the first user equipment to know the identity of the second user equipment.
  • the step of acquiring the identity and/or the step of providing the identity may be performed either automatically or selectively in response to the first user equipment being subscribed to the service that allows the first user equipment to know the identity of the second user equipment.
  • the acquiring step comprises the step of sending a request for the identity of the second user equipment from the node to a second node using an initial address message (IAM) of an ISDN user part (ISUP) protocol, and receiving the identity of the second user equipment from the second node using an answer message (ANM) or a connect message (CON) of the ISDN user part (ISUP) protocol.
  • the acquiring step comprises the step of receiving the identity of the second user equipment from a second node using an initial address message (IAM) of an ISDN user part (ISUP) protocol.
  • the acquiring step comprises the step of sending a request for the identity of the second user equipment from the node to a second node using an ISDN user part (ISUP) information request message, and receiving the identity of the second user equipment from the second node using an ISDN user part (ISUP) information message.
  • ISUP ISDN user part
  • the steps of sending the ISUP information request message and receiving the ISUP information message may be performed prior to a step of performing one or more enhanced direct transfer application part (DTAP) messages and/or unstructured supplementary service data (USSD) messages between the node and the first user equipment.
  • DTAP enhanced direct transfer application part
  • USB unstructured supplementary service data
  • the step of providing the identity of the second user equipment to the first user equipment may comprise the steps of using enhanced direct transfer application part (DTAP) protocol and/or unstructured supplementary service data (USSD) protocol.
  • DTAP enhanced direct transfer application part
  • USB unstructured supplementary service data
  • a node in a telecommunication system comprises: means adapted to receive a call establishment request between a first user equipment and a second user equipment; means adapted to acquire the identity of the second user equipment; and means adapted to provide the identity of the second user equipment to the first user equipment.
  • the node further comprises means adapted to determine whether the first user equipment is subscribed to a service that allows the first user equipment to know the identity of the second user equipment.
  • the means adapted to acquire the identity may be configured to use one or more ISDN user part (ISUP) messages sent between the node and a second node associated with the second user equipment.
  • ISUP ISDN user part
  • at least one of the ISDN user part (ISUP) messages comprises an initial address message (IAM), an answer message (ANM), a connect message (CON), an information request message or an information message.
  • the means adapted to provide the identity of the second user equipment to the first user equipment may be configured to use enhanced direct transfer application part (DTAP) protocol and/or unstructured supplementary service data (USSD) protocol.
  • DTAP enhanced direct transfer application part
  • USB unstructured supplementary service data
  • the means adapted to acquire the identity and/or the means adapted to provide the identity may be operable either automatically or selectively in response to a specific request made by the first user equipment to know the identity of the second user equipment.
  • the invention has the advantage of enabling a first user equipment, for example that of a law agent from a law enforcement agency, to receive the identity of a connected party, for example a second user equipment being used by a suspect target.
  • Figure 1 shows the structure of an international mobile equipment identity (IMEI) according to the 3GPP standard TS 23.003;
  • IMEI international mobile equipment identity
  • Figure 2 shows a flow chart illustrating the steps performed by a first aspect of the present invention
  • Figure 3 shows a node according to one aspect of the invention
  • Figure 4 shows the steps performed according to one embodiment of the invention, when making a call from a first user equipment to a second user equipment
  • Figure 5a shows the steps performed according to another embodiment when making a call from a first user equipment to a second user equipment
  • Figure 5b shows the steps performed according to another embodiment when making a call from a first user equipment to a second user equipment
  • Figure 6 shows the steps performed according to another embodiment when a first user equipment receives a call from a second user equipment
  • Figure 7 shows the steps performed according to another embodiment when a first user equipment receives a call from a second user equipment
  • Figure 8 shows the steps performed according to another embodiment when a first user equipment receives a call from a second user equipment
  • Figure 9 shows the steps performed according to another embodiment when a first user equipment receives a call from a second user equipment
  • Figure 10 shows the steps performed according to another embodiment when making a call from a first user equipment to a second user equipment through an IP multimedia system (IMS); and
  • IMS IP multimedia system
  • Figure 1 1 shows further details of the steps performed in the IMS of figure 10.
  • the present invention is concerned with a telecommunications system and method that enables a first user equipment, for example user equipment used by a law enforcement agency, to receive or learn the identity (such as the IMEI) of a second user equipment, for example a phone that has been used in suspect calls (for example, calls to or from suspect persons). Knowing the identity (IMEI) of user equipment of particular calls may, in some cases, be of particular interest to law agents.
  • the IMEI is associated with a particular user equipment. When for a particular user equipment the SIM is swapped, calls made to or from that user equipment still show the same IMEI, despite the SIM being swapped. In other words, the same IMEI will be placed in the call detail record (CDR) of the serving mobile switching centre (MSC).
  • CDR call detail record
  • MSC serving mobile switching centre
  • the invention provides a mechanism that enables a law enforcement agency, by simple means, to acquire or know the IMEI of the remote party (calling party or called party).
  • the invention has numerous applications. For example a law enforcement agency may notice, for example, that two suspect calls, possibly established to or from different persons (subscribers) exhibit the same IMEI. This would indicate that these calls are made from the same user equipment; hence, the respective callers/callees are somehow related to one another.
  • IMEI international mobile equipment identity
  • IMSI international mobile subscriber identity
  • the identity or IMEI of a calling/called party can be used for any purpose or application, including but not limited to keeping track of particular devices.
  • the invention can be used to provide input to regular lawful investigation work.
  • the invention relates to acquiring the identity of a user equipment when a call is established between the user equipment and another user equipment, and providing the identity of the user equipment to the other user equipment.
  • this aspect of the invention comprises the step of receiving a call establishment request between a first user equipment and a second user equipment, step 101 , acquiring the identity of the second user equipment, step 103, and providing the identity of the second user equipment to the first user equipment, step 105.
  • step 103 Prior to the step of acquiring the identity of the second user equipment and/or the step of providing the identity of the second user equipment to the first user equipment (i.e.
  • the invention may also comprise the step of determining whether the first user equipment is subscribed to a service that allows the first user equipment to acquire or receive the identity of the second user equipment, as shown by steps 102 and 104.
  • the embodiments below describe examples of how the identity of the user equipment can be acquired, and how the identity can be provided to the other user equipment. The embodiments also describe examples of how this may be achieved when making a call to a target user equipment, or receiving a call from a target user equipment.
  • FIG. 3 shows a node 30, for example a mobile switching centre (MSC) in a telecommunications network, according to one aspect of the present invention.
  • the node 30 comprises receiving means 31 for receiving a call establishment request between a first user equipment and a second user equipment.
  • the receiving means may comprise an interface, for example an interface for communicating with another mobile switching centre (MSC) and/or a mobile station (e.g. user equipment),
  • the node 30 further comprises acquiring means 32 for acquiring the identity of a user equipment.
  • the acquiring means 32 may comprise a processor that is adapted to obtain the identity of a user equipment, for example by controlling the receiving means or retrieving the identity information from an internal memory (not shown) within the node 30.
  • the node 30 further comprises providing means 33 for providing the identity of a user equipment to another user equipment.
  • Figure 4 shows the steps performed according to one embodiment of the invention, for enabling a first user equipment MS-A to acquire the identity of a second user equipment MS-B. It is noted that not all of the steps shown in figure 4 are essential to the invention, and that other steps (not shown) may also be performed during the procedure without departing from the scope of the invention.
  • a first user equipment MS-A begins the process of establishing a call with a second user equipment MS-B, by communicating with a first mobile switching centre MSC-A serving the first user equipment MS-A.
  • Step 201 may comprise the direct transfer application part (DTAP) setup procedure. If the first mobile switching center MSC-A serving the first user equipment MS-A determines that the first user equipment MS-A requires the identity of the second user equipment MS-B, the first mobile switching center MSC-A serving the first user equipment MS-A takes steps to acquire the identity of the second user equipment MS-B.
  • DTAP direct transfer application part
  • the first mobile switching centre MSC-A determines that the first user equipment MS-A requires the identity of the second user equipment MS-B based on the fact that the first user equipment MS-A is subscribed to a predetermined service (i.e. a service which allows the identity of the second user equipment MS-B to be provided or made known to the first user equipment MS-A).
  • a predetermined service i.e. a service which allows the identity of the second user equipment MS-B to be provided or made known to the first user equipment MS-A.
  • the subscription to the predetermined service acknowledges that the first user equipment MS-A is entitled or authorised to receive the identity of the second user equipment.
  • the first user equipment MS-A has a form of "privileged" subscription.
  • the subscription to this privileged service may form part of the subscribed services in the home location register (HLR) of the first user equipment MS-A, and may be conveyed from the HLR to the MSC-A of the first user equipment.
  • the subscription to this privileged service may be conveyed to the MSC-A of the first user equipment using one of the available code values, i.e. spare values, of the SS-Code values in MAP (as defined in standard 3GPP TS 29.002).
  • the first mobile switching centre MSC-A determines that the first user equipment MS- A is subscribed to this service, the first mobile switching centre MSC-A can take steps to acquire the IMEI of the second user equipment MS-B. For example, in steps 202a and 202b the first mobile switching centre MSC-A communicates with a second mobile switching centre MSC-B serving the second user equipment MS-B. In figure 4 this is shown as being made through an intermediate, or gateway mobile switching centre
  • GMSC-B gateway mobile switching centre GMSC-B. It will be appreciated that the presence of an intermediate, or gateway mobile switching centre GMSC-B is only optional, and may be omitted without departing from the scope of the present invention.
  • the IMEI of the second user equipment MS-B may be requested, for example, using ISDN user part (ISUP) messages sent between the first mobile switching centre MSC- A and the second mobile switching centre MSC-B when establishing a call between the first user equipment MS-A and the second user equipment MS-B.
  • ISUP ISDN user part
  • IAM ISUP initial address message
  • the request may be conveyed, for example, in one of the spare bits in the "optional call forward indicators" parameter in the ISUP IAM (as defined under ITU-T Q.763, section 3.38).
  • the second mobile switching centre MSC-B serving the second user equipment MS-B can acquire the IMEI of the second user equipment MS-B during the DTAP setup procedure shown in steps 203 and 204.
  • the second mobile switching centre MSC-B may have the IMEI of the second user equipment MS-B already available, for example stored in its memory as set out by standard 3GPP TS 24.008, "Authentication and ciphering request" procedure.
  • the second mobile switching centre MSC-B may have previously acquired the IMEI of the second user equipment MS-B during previous DTAP procedures, and kept the IMEI in its internal memory for use with designated MAP messages, such as "any time interrogation" (ATI) result and Update Location (UL), as defined by 3GPP TS 29.002.
  • ATI any time interrogation
  • UL Update Location
  • the second mobile switching centre MSC-B serving the second user equipment MS-B can include the IMEI of the second user equipment MS-B in the ISUP Connect message (CON) or ISUP Answer message (ANM) sent from the second mobile switching centre MSC-B to the first mobile switching centre MSC-A in steps 205a and 205b.
  • CON ISUP Connect message
  • NNM ISUP Answer message
  • the ISUP messages are shown passing through an intermediate or gateway mobile switching centre GMSC-B, this is merely optional, and the invention is also applicable where the messages are passed directly between MSC- A and MSC-B, or vice versa.
  • the Generic Number parameter can be used for conveying the IMEI, for example using one of the spare Number qualifier indicator values, as defined in ITU-T Q.763, section 3.26.
  • Reporting the IMEI of the second user equipment MS-B from the first mobile switching centre MSC-A to the first user equipment MS-A can be done using suitable signaling messages, for example through enhanced DTAP signaling and a suitably adapted first user equipment MS-A, as shown in step 206 (further details of the DTAP signaling being found in standard 3GPP TS 24.008, section 9.3.5).
  • a designated parameter can be added to the Connect message (CON); said parameter containing the identity information, i.e. IMEI.
  • the transfer of the IMEI of the second user equipment MS-B from the first mobile switching centre MSC-A to the first user equipment MS-A can be carried out using USSD applications in the first mobile switching centre MSC-A, as shown in step 207.
  • the first mobile switching centre MSC-A can invoke a resident USSD application, which uses standard USSD signaling to transfer the IMEI of the second user equipment MS-B (in a USSD message) to the first user equipment MS-A.
  • the first user equipment MS-A can be adapted to place the IMEI of the second user equipment MS-B in the call log, for example, and optionally display the IMEI of the second user equipment MS-B together with one or more other parameters such as the connected line identity, time or date, if available.
  • the first user equipment MS-A is automatically provided with the IMEI of the second user equipment MS-B based on the first user equipment MS-A being subscribed to the service.
  • the first user equipment MS-A making the originating call i.e. the law agent
  • the first mobile switching centre MSC-A serving the first user equipment MS-A will acquire the identity of the second user equipment MS-B by including in the ISUP IAM a request for IMEI from the second user equipment MS-B.
  • the subscription by the first user equipment MS-A may have a "default request qualifier".
  • the default request qualifier is an additional parameter associated with the subscription.
  • the default request qualifier has the following functions:
  • default request qualifier TRUE.
  • the default request qualifier is set as "true”
  • the MSC-A will automatically request the identity of the connected user equipment.
  • the first user equipment MS-A may, when sending the call establishment request message to the first mobile switching centre MSC-A, indicate to the MSC-A that for this particular call, the first user equipment MS-A does not wish to receive the identity of the second user equipment MS-B.
  • a specific request can be made by the first user equipment MS-A to override the default setting.
  • default request qualifier FALSE.
  • the default request qualifier is set as "false”
  • the default request qualifier is set to "false”
  • the MSC-A will automatically omit to include a request for the IMEI of the connected user equipment.
  • the first user equipment MS-A may, when sending the call establishment request message to the first mobile switching centre MSC-A, indicate to the MSC-A that for this particular call, the first user equipment MS- A wishes to receive the IMEI of the second user equipment MS-B.
  • a specific request can be made by the first user equipment MS-A to override the default setting.
  • Figures 5a and 5b show partial signaling sequences depicting the usage of the codes, for example " * 90 * " and " * 91 * ", for making a per-call indication by the first user equipment MS-A, included in the call establishment request message sent to the first mobile switching centre MSC-A.
  • a first code for example " * 90 * "
  • a telephone number 0161249911 i.e. resulting in * 90 * 0161249911 as shown in step 301 a
  • the MSC-A is configured to remove the first code " * 90 * " from the dialed digit string and to suppress the IMEI request in the outgoing ISUP IAM, as shown in step 302a.
  • a second code for example " * 91 * ", is placed before a telephone number 016124991 1 (i.e.
  • the MSC-A is configured to remove the second code " * 91 * " from the dialed digit string and to include the IMEI request in the outgoing ISUP IAM, as shown in step 302b. Subsequent stages for acquiring and providing the IMEI can follow the steps described above in figure 4.
  • the first user equipment MS-A may still chose to opt out of receiving the service (i.e. the identity of the second user equipment MS-B), either on a default basis or on a per-call basis.
  • the step of acquiring the identity and/or the step of providing the identity is performed either automatically or selectively in response to the first user equipment being subscribed to the service that allows the first user equipment to know the identity of the second user equipment.
  • the "acquiring step” in the flow chart of figure 2 comprises the step of sending a request for the identity of the second user equipment MS-B from the first mobile switching centre MSC-A to the second mobile switching centre MSC-B using an initial address message (IAM) of the ISDN user part (ISUP) protocol (i.e. step 202a), and receiving the identity of the second user equipment MS-B from the second mobile switching centre MSC-B using an answer message (ANM) or a connect message (CON) of the ISDN user part (ISUP) protocol, step 205b.
  • IAM initial address message
  • ANM answer message
  • CON connect message
  • the "providing step” of figure 2 comprises the step of using DTAP signalling to send the identity of the second user equipment MS-B from the first mobile switching centre MSC-A to the first user equipment MS-A (i.e. step 206), and/or using USSD signalling (i.e. step 207).
  • the "acquiring step” in the flow chart of figure 2 comprises the step of retrieving the identity of the second user equipment MS-B either from the memory of the second mobile switching centre MSC-B (e.g. when the IMEI has been previously obtained) or on the fly from the second user equipment MS-B using DTAP signalling (steps 203, 204).
  • the "providing step” of figure 2 comprises the step of sending the IMEI in the ISUP ANM or ISUP CON message from the second mobile switching centre MSC-B to the first mobile switching centre MSC-A.
  • figures 4, 5a and 5b deal with the situation where the identity of a target user equipment (i.e. the second user equipment MS-B) is provided to the law agent (i.e. the first user equipment) when a call is being established from the law agent to the target user equipment.
  • the invention can also be applied to the situation when a . call is made from the target user equipment to the law agent.
  • the identity of the second user equipment MS-B is also acquired, and provided to the first user equipment MS-A.
  • the IMEI of the second user equipment MS-B can be acquired and provided to the first user equipment MS-A in response to the first user equipment MS-A being subscribed to a predetermined service (i.e. a "privileged" subscription that enables the first user equipment MS-A to know or receive the identity of the second user equipment MS-B).
  • a predetermined service i.e. a "privileged" subscription that enables the first user equipment MS-A to know or receive the identity of the second user equipment MS-B.
  • the subscription to this privileged service may form part of the subscribed services in the home location register (HLR) of the first user equipment MS-A, and may be conveyed from HLR to the first mobile switching centre MSC-A serving the first user equipment MS-A using one of the spare or available SS-Code values in MAP (the code values being defined in 3GPP standard TS 29.002).
  • providing the identity of the second user equipment MS- B (i.e. the calling party) to the first user equipment MS-A (i.e. the called party) having the aforementioned privileged subscription can be made on an unconditional basis, for example by inclusion in the ISUP IAM.
  • providing the identity of the second user equipment MS-B to the first user equipment MS-A having the aforementioned privileged subscription can be made through an ISUP information request. Further details of the first of the above mentioned embodiments will now be made with reference to figure 6.
  • the second mobile switching centre MSC-B serving the second user equipment MS-B includes the IMEI of the second user equipment MS-B in the ISDN user part (ISUP) initial address message (IAM) sent between the second mobile switching centre MSC-B and the first mobile switching centre MSC-A when establishing a call from the second user equipment MS- B to the first user equipment MS-A, steps 401 , 402, 403.
  • IAM ISDN user part
  • a spare value of the Number qualifier indicator in the Generic Number parameter of the ISUP IAM message can be used.
  • the first mobile switching centre MSC-A if it is determined that the ISUP IAM arrives for a user equipment having a subscription to said privileged service (i.e. service to receive the IMEI of the calling party), the first mobile switching centre MSC-A serving the first user equipment MS-A acquires the IMEI and provides the IMEI of the second user equipment MS-B to the called first user equipment MS-A, for example when offering the call to that party.
  • privileged service i.e. service to receive the IMEI of the calling party
  • Reporting the IMEI of the second user equipment MS-B to the first user equipment MS- A can be done through enhancements to the DTAP signaling procedures and an adapted first user equipment MS-A, as shown in step 404.
  • DTAP signaling procedures defined in 3GPP standard TS 24.008, section 9.3.23 may be used.
  • a designated parameter can be added to the Setup message, said parameter containing the IMEI of the second user equipment MS-B.
  • the transfer of the IMEI of the second user equipment MS-B to the first user equipment MS-A can be done using a USSD application in the first mobile switching centre MSC-A.
  • the first mobile switching centre MSC-A serving the first user equipment MS-A can invoke a resident USSD application, which uses standard USSD signaling to transfer the IMEI in a USSD message to the first user equipment MS-A, as shown in steps 405.
  • the first user equipment MS-A can place the IMEI of the second user equipment MS-B in the call log.
  • the first user equipment MS-A is adapted to display the IMEI of the second user equipment MS-B to the first user equipment MS- A together with other information, such as the calling line identity, time or date, if available.
  • the user equipment device comprises display means that is adapted to display the identity of a connected user equipment.
  • the identity of the second user equipment MS-B is automatically (or unconditionally) provided to the first user equipment MS-A when a call is established from the second user equipment MS-B to the first user equipment MS-A.
  • the IMEI can be automatically provided to the first user equipment MS-A as a result of the first user equipment MS-A being subscribed to the service.
  • providing the identity of the second user equipment MS-B to the first user equipment MS-A having the aforementioned privileged subscription can be made through an ISUP information request.
  • Figure 7 describes such an embodiment.
  • the first mobile switching centre MSC- A serving the first user equipment MS-A i.e. law agent or called party
  • the first mobile switching centre MSC-A may request the second mobile switching centre MSC-B serving the calling party (i.e. serving the second user equipment MS-B), to provide the IMEI of the second user equipment MS- B.
  • the ISUP message "Information request” may be used.
  • the Information request message containing the "information request indicators” parameter may be sent from the first mobile switching centre MSC-A of the first user equipment MS-A towards the second mobile switching centre MSC-B serving the second user equipment MS-B.
  • One of the spare or reserved bits, for example, in that parameter may be used to signal that the IMEI is being requested.
  • the second mobile switching centre MSC-B associated with the second user equipment MS-B will, in response, send the ISUP information message in steps 506, 507.
  • the ISUP information message will contain the requested IMEI of the second user equipment MS-B.
  • the first mobile switching centre MSC-A can then provide the IMEI of the calling party towards the first user equipment MS-A through DTAP signaling (as shown in step 508) or through USSD signaling (as shown in step 509), as described in further detail in figure 6 above.
  • the first mobile switching centre MSC-A serving the first user equipment MS-A requests the IMEI from the second mobile switching centre MSC-B of the calling party (i.e. the second user equipment MS-B), prior to sending DTAP Setup messages to the first user equipment MS-A.
  • Figure 8 shows an alternative embodiment, whereby the first mobile switching centre MSC-A offers the call to first user equipment MS-A without delay, as shown in step 604. Thereafter, whilst call alerting is ongoing, the first mobile switching centre MSC-A uses ISUP messages "Information request" (steps 605, 606) and “Information” (steps 607, 608) to acquire the IMEI of the calling party from the second mobile switching centre MSC-B. When the IMEI is received, the first mobile switching centre MSC-A provides the IMEI towards the first user equipment MS-A by means of USSD signaling, step 609.
  • the embodiment of figure 8 has the advantage of not incurring any delay in the normal call set up procedure.
  • the embodiments of figures 7 and 8 provide IMEI reporting upon request (i.e. through ISUP Information request), compared to the unconditional reporting of IMEI in figure 6 (i.e. using unconditional inclusion of IMEI in ISUP IAM).
  • the embodiments of figures 7 and 8 have the advantage that the IMEI will be conveyed through the network only when required, i.e. only when the called subscriber has a subscription to the IMEI presentation service.
  • the second mobile switching centre MSC-B already has the IMEI of the second user equipment MS-B stored therein. It is noted, however, that these embodiments may involve further steps between the second mobile switching centre MSC-B and the second user equipment MS-B when the IMEI is not already stored in the second mobile switching centre MSC-B.
  • the first user equipment MS-A is automatically provided with the identity of the second user equipment MS-B when the first user equipment MS-A is subscribed to the service. In other words, whenever a call is received by the first user equipment MS-A (e.g.
  • the first mobile switching centre MSC-A will either provide the IMEI of the calling party to the first user equipment (in the case of figure 6), or generate a request for IMEI towards the calling party (in the case of figures 7 and 8) before providing the IMEI to the first user equipment, such that the first user equipment MS-A will always receive the identity of the calling party (i.e. the identity of the second user equipment MS-B)
  • the subscription by the first user equipment MS-A may have a "default request qualifier".
  • the default request qualifier is an additional parameter associated with the subscription.
  • the default request qualifier has the following functions:
  • default request qualifier TRUE.
  • the default request qualifier is set as "true”, this implies that the default action by the first mobile switching centre MSC-A, when receiving an incoming call, is to send a request for IMEI towards the calling party.
  • default request qualifier FALSE.
  • FALSE FALSE.
  • the default request qualifier is set as "false”
  • the first user equipment MS-A may, when having answered the call, send an indication to the first mobile switching centre MSC-A that for this particular call, the first user equipment MS-A wishes to receive the IMEI of the calling party.
  • a per-call request can be made by the first user equipment MS-A as shown in step 709, whereby a specific request is sent from the first user equipment MS-A to the first mobile switching centre MSC-A.
  • the request may have the form of an unstructured supplementary service data (USSD) message.
  • USSD unstructured supplementary service data
  • An example of a USSD message for this purpose is the use of code structures such as " * 91#", which structure is in accordance with GSM TS 02.30.
  • the first mobile switching centre MSC-A will, in response to receiving this USSD code, request the IMEI from the calling party, steps 710, 71 1 , 712, 713.
  • the ISUP signaling mechanism can be used to acquire the IMEI of the calling party.
  • the first mobile switching centre MSC-A can send the IMEI to the first user equipment MS-A, for example by including the IMEI in a response message to the USSD request.
  • the embodiments of figures 6, 7, 8 and 9 have the advantage of acquiring and providing the identity of the second user equipment to the first user equipment when a call is established from the second user equipment to the first user equipment.
  • One very useful feature that is facilitated through the present invention is the following. When a suspect call is received from a user equipment, a law enforcement agent can easily return a call to that particular phone, even when the SIM card of that phone is swapped.
  • the call log in the phone can be adapted to contain the IMEI, if available. When scrolling through the call log, the phone can initiate a call towards that IMEI.
  • the Called party BCD number in a DTAP Setup message from the GSM phone is adapted to contain a Numbering plan indicator (NPI) and Type of number (TON) that denotes IMEI.
  • NPI Numbering plan indicator
  • TON Type of number
  • the embodiments described above refer to the IMEI of the remote party being provided to the first user equipment in such a way that the IMEI can be displayed on the first user equipment.
  • the IMEI of the remote party may be provided in a detailed call log, for example provided on a remote location such as a web-based server.
  • a subscriber may access the call log via the first user equipment. Accessing the call log may be carried out using an application resident in the first user equipment, for example using an http client for accessing the call log.
  • the subscriber having said privileged service subscription (to receive the IMEI of the remote calling or called party) may establish a call to that IMEI, by browsing through the web based call log and selecting an IMEI from said call log.
  • the embodiments described above have been made in relation to the first user equipment (i.e. that of the law agent) being a mobile terminal such as a GSM terminal, it is noted that the invention also applies to a first user equipment in the form of an ISDN terminal instead of a mobile terminal.
  • the ISDN terminal may use DSS1 signaling as the access protocol (as defined in ITU-T Q.931 ).
  • the invention has the advantage that it enables a law enforcement agent (for example a police officer or investigator) to track the equipment that is used by a person for a particular call.
  • a law enforcement agent for example a police officer or investigator
  • a law enforcement agent can easily return a call to that phone, even when the SIM card of that phone is swapped.
  • the law enforcement officer can easily determine on which device the call is answered and then determine which other persons (MSISDNs) have been using that device.
  • the invention has been described in relation to providing a lawful intercept based on IMEI, the invention is concerned with the aspect of providing the IMEI of a remote party to a law agent, rather than the lawful intercept per se.
  • the embodiments above refer to using ISUP messages for obtaining the IMEI of the second user equipment, it will be appreciated that other protocols may also be used, without departing from the scope of the invention as defined in the appended claims. Similarly, other signaling protocols than DTAP and USSD may be used for passing the IMEI between the mobile switching centre and the user equipment.
  • the embodiments refer to the use of mobile switching centres (MSCs) for connection to the user equipment.
  • MSCs mobile switching centres
  • nodes or control nodes can be used for acquiring the identity information, and providing the identity information to the user equipment.
  • the above embodiments may be used with any form of telecommunications network, including GSM, 3G, LTE, ISDN or PSTN communication networks.
  • the present invention may also be applied in the case where an IP multimedia system (IMS) is used as a service network and/or transmission network.
  • IMS IP multimedia system
  • the traversing of the IMS network may serve various purposes, including: a calling party, while using a GSM phone, is a subscriber of an IMS network; the IMS network is used to handle voice calls (or other forms of communication sessions) established from the calling party; a called party, while using a GSM phone, is a subscriber of an IMS network; the IMS network is used to handle voice calls (or other forms of communication sessions) established towards the called party; an IMS network is used as a transmission network, within a network or between different networks.
  • IMS uses the session initiation protocol (SIP) for call establishment.
  • SIP session initiation protocol
  • the request for IMEI, as well as the IMEI itself are, for the purpose of using IMS as a transit network, as described above, mapped to corresponding SIP messages and SIP headers or parameters.
  • the request for IMEI and the IMEI itself can be conveyed transparently through an IMS network, between the mobile switching centres or PSTN exchanges serving the calling and called party.
  • the use of an IMS network, as described above, is depicted by means of an example shown in figure 10.
  • FIG 10 illustrates an arrangement whereby an IMS core is provided as a transit network for a call established from a first user equipment MS-A (for example a law agent using a GSM phone), to a second user equipment MS-B (for example a destination target subscriber using a GSM phone), as shown in steps 801 to 811.
  • the call established between the first user equipment MS-A and the second user equipment MS-B traverses the IMS network for one of the reasons given above.
  • the IMEI request and the IMEI itself are mapped to corresponding SIP messages and SIP headers or parameters, thereby enabling the request for IMEI and the IMEI itself to be conveyed transparently through the IMS network.
  • Figure 1 1 provides further details relating to how the request for IMEI and IMEI itself are mapped during the traversal of the IMS network.
  • a first media gateway controller constitutes a border of the IMS network, for the control plane, connecting the IMS network with a circuit switched network, such as GSM or PSTN.
  • the first media gateway controller MGC-A provides a control interface between the IMS network and a first mobile switching centre MSC-A serving the first user equipment MS-A.
  • a call session control function (CSCF) shown in figure 11 represents a combination of the interrogating CSCF (I-CSCF) and serving CSCF (S-CSCF).
  • Figure 1 1 does not illustrate nodes such as home subscriber system (HSS) or breakout gateway control function (BGCF). It is, however, understood that these nodes, and other nodes, where applicable, may form part of the call establishment function in the IMS network, depending on an actual call.
  • HSS home subscriber system
  • BGCF breakout gateway control function
  • Figure 1 1 depicts the conversion of the "ISUP IAM" to a "SIP Invite" by the first media gateway controller MGC-A, i.e. between steps 901 and 902.
  • the first media gateway controller MGC-A converts the "request for IMEI” parameter in the ISUP IAM into a SIP header "Require: IMEI”.
  • a second media gateway controller MGC-B converts the SIP Invite "Require: IMEI” back to a ISUP IAM parameter "request for IMEI", i.e. between steps 903 and 904.
  • the ISUP ANM sent from the called party i.e.
  • the IMEI parameter in the ISUP ANM is converted, by the second media gateway controller MGC-B, into a SIP header "IMEI: ⁇ value>", whereby ⁇ value> represents the actual IMEI.
  • the "IMEI: ⁇ value>” is placed into a "SIP 200 Ok” message, as shown between steps 905 and 906.
  • the first media gateway controller MGC-A converts the SIP 200 Ok message into an ISUP ANM message.
  • the "IMEI: ⁇ value>" from the SIP 200 Ok message is converted to the IMEI in ISUP ANM.
  • the request for IMEI and the IMEI itself can be conveyed transparently through an IMS network, between a calling and called party's serving MSC or Local exchange.
  • FIGS. 10 and 11 are described in relation to one arrangement whereby a call is made from a law agent to a target terminal, it will be appreciated that an IMS can be used with any of the above mentioned embodiments.
  • a user equipment may comprise any form of user equipment, including but not limited to mobile terminals, ISDN terminals or other terminals.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Technology Law (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé qui comprend les étapes d'établissement d'une communication entre un premier équipement utilisateur et un second équipement utilisateur, d'acquisition de l'identité du second équipement utilisateur, et de fourniture de l'identité du second équipement utilisateur au premier équipement utilisateur. L'invention offre l'avantage de permettre à un agent d'application de la loi (par exemple, un officier de police ou un enquêteur) de suivre l'équipement qui est utilisé par une personne pendant une communication particulière. Lorsqu'un appel suspect est reçu, un agent d'application de la loi peut facilement renvoyer un appel à ce téléphone, même lorsque la carte SIM de ce téléphone a été échangée. Lors d'un appel d'un numéro suspect, l'officier d'application de la loi peut facilement déterminer quel dispositif répond à l'appel et déterminer ensuite quelles autres personnes (MSISDN) ont utilisé ce dispositif.
PCT/EP2008/066095 2008-11-24 2008-11-24 Procédé et appareil d'acquisition d'un imei associé à un imsi WO2010057539A1 (fr)

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PCT/EP2008/066095 WO2010057539A1 (fr) 2008-11-24 2008-11-24 Procédé et appareil d'acquisition d'un imei associé à un imsi
EP08875359.5A EP2368355B1 (fr) 2008-11-24 2008-11-24 Procédé et appareil d'acquisition d'un imei associé à un imsi
CN2008801320495A CN102224725A (zh) 2008-11-24 2008-11-24 用于获取与imsi相关联的imei的方法和设备
US13/130,012 US9112962B2 (en) 2008-11-24 2008-11-24 Method and apparatus for acquiring an IMEI associated to an IMSI

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PCT/EP2008/066095 WO2010057539A1 (fr) 2008-11-24 2008-11-24 Procédé et appareil d'acquisition d'un imei associé à un imsi

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EP2368355B1 (fr) 2019-04-17

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