US20010034204A1 - Method and system for tracing a subscription - Google Patents
Method and system for tracing a subscription Download PDFInfo
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- US20010034204A1 US20010034204A1 US09/796,178 US79617801A US2001034204A1 US 20010034204 A1 US20010034204 A1 US 20010034204A1 US 79617801 A US79617801 A US 79617801A US 2001034204 A1 US2001034204 A1 US 2001034204A1
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- imei
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
Definitions
- the present invention relates to telecommunication systems, in particular WLL systems.
- WLL system refers to a system in which a subscriber is connected to a telephone network via a wireless link system.
- the wireless link system can be implemented using mobile communication technology, such as GSM technology (GSM, Global System for Mobile communications).
- GSM Global System for Mobile communications
- the subscriber interface is implemented using a special telecommunication terminal.
- the subscriber's telecommunication terminal is connected via a radio link to a telephone exchange or an access node.
- a base station Between the telecommunication terminal and the telephone exchange or access node there is a base station, by means of which call signals received from the telecommunication terminal by radio are transmitted via the telephone exchange or access node further to the public telephone network and vice versa.
- the access node is connected to the telephone exchange e.g. using a V5.1 or V5.2 protocol.
- V5.1 and V5.2 Open interfaces (V5.1 and V5.2) between an access node and a telephone exchange are defined in the ETSI (European Telecommunications and Standards Institute) standards.
- V5 interfaces enable subscribers belonging to a physically separate access network, which may be a wired or a wireless network, to be connected using a standard telephone exchange interface.
- Call tracing is a necessary function in the WLL system. Tracing is used to collect information about call-time events related to a given subscriber, such as the radio channel used, power level, location, call setup direction, duration or start time.
- the call tracing function can be used to locate faults in the wireless link system, to locate stolen terminals or mischief caused in the network via a terminal, or to prevent illicit use of a terminal.
- IMSI International Mobile Subscriber Identity
- IMEI International Mobile station Equipment Identity
- the ETSI standard describes both IMSI and IMEI based tracing methods. Managing all the information generated as a result of different types of tracing is a complicated task which occupies resources of both the network management system and the operator. The operator must have separate means for IMSI and IMEI tracing procedures. Thus, both the means and the associated training for their use are a source of expenses to the operator.
- the object of the present invention is to solve the problems described above.
- a specific object of the invention is to disclose a new type of method and system for tracing subscriptions in a WLL system.
- the invention relates to a method for tracing a subscription in a telecommunication system comprising a local exchange, an access node connected to the local exchange, a wireless link system connected to the access node and a telecommunication terminal connected to the access node via the wireless link system.
- an IMEI code corresponding to the telecommunication terminal and an IMSI code corresponding to the subscriber are defined in the telecommunication system.
- the access node starts the tracing of a subscription on the basis of the IMEI code and converts the tracing into an IMSI tracing procedure, so that the means intended for tracing in the access node only see the IMSI tracing procedure.
- a reference number is generated on the basis of IMEI tracing and this number is linked with the IMSI tracing.
- the IMEI tracing is preferably activated for a telecommunication terminal listed in the equipment register of the access node as a device to be traced.
- a tracing report is generated which comprises the IMEI code, IMSI code and reference number.
- the IMSI code corresponding to the IMEI code is preferably retrieved from a subscriber data register.
- the IMSI code may also be taken from the call initiating messages.
- an alarm is generated in conjunction with a call by a terminal without a subscriber identity module, in which case e.g. the IMEI code, location area and call event of the telecommunication terminal are presented in conjunction with the alarm.
- the wireless link system is based on a digital mobile communication system, such as the GSM system.
- the invention concerns a system for the tracing of a subscription in a telecommunication system as described above.
- the access node comprises means for tracing a subscriber on the basis of the IMEI code and means for converting the tracing into an IMSI tracing procedure.
- the access node comprises means for generating a reference number based on IMEI tracing and for linking the reference number with the IMSI tracing procedure.
- the access node preferably comprises an equipment register in which the telecommunication terminal subject to IMEI tracing is entered.
- the access node comprises means for generating a report.
- the report may include the IMEI code, the IMSI code and the reference number.
- a system according to the invention comprises a subscriber data register comprised in the access node, said register containing the IMSI code corresponding to the IMEI code.
- the access node preferably comprises means for obtaining the IMSI code from the call initiating messages, allowing it to be transferred to the subscriber data register.
- the access node comprises means for generating an alarm from a call by a telecommunication terminal without a subscriber identity module, the alarm comprising e.g. the IMEI code and location area and call event of the telecommunication terminal.
- the wireless link system used is based on a digital mobile communication system, such as the GSM system.
- the invention allows easier processing of the tracing data collected by an access node because it is now possible to utilize IMSI tracing operations and means. In the system, there is no need for separate IMEI tracing follow-up processing and associated equipment. In this way, system capacity is made available for other operations and efficiency is maximized.
- FIG. 1 presents a diagram representing a system according to the invention.
- FIG. 2 is a flow diagram illustrating an embodiment of the invention.
- FIG. 1 presents the components of a system according to the invention.
- a telecommunication terminal MS is connected via a wireless link system WLL to an access node AN, which may be a DAXnode 5000 WLL manufactured by Nokia.
- the wireless link system WLL comprises at least one base station BS, which is connected via an Abis interface to the access node AN; in this example there are two base stations BS 1 and BS 2 , forming cell areas 10 and 11 .
- the access node AN controls the operation of the base stations BS.
- the cell areas 10 and 11 form a mobility area 12 , which is the operating area defined in this example for the terminal MS.
- the access node AN is connected via a V5 interface to the local exchange LE, so that, as seen by the local exchange LE, the terminal MS in the WLL system is a normal wired-network subscriber.
- Communicating with the access node AN is a network management system NMS, which comprises a MML user interface, (MML, Man-Machine Language).
- the access node AN comprises a subscriber data register WFR (Wireless Fixed Register), which is one of the program blocks in the access node AN.
- WFR Wireless Fixed Register
- the access node AN comprises means 1 for tracing a telecommunication terminal on the basis of the IMET code attached to the terminal MS.
- These means 1 comprise e.g.: 1) devices for the activation of tracing with MML commands; 2) actual tracing apparatus (equipment identity register EIR, subscriber data register WFR, radio interface equipment); and 3) output means, such as e.g. a network management system NMS.
- the tracing apparatus 2 comprising e.g. the subscriber data register WFR, IMEI tracing is converted into IMSI tracing, which means that tracing initiated as an IMEI tracing procedure is implemented using IMSI tracing equipment 6 .
- a reference number is generated from the IMEI tracing and attached later to the IMSI tracing procedure after the conversion.
- These means 3 comprise e.g. the subscriber data register WFR and a program block in the access node AN specialized in MML commands. The value of the reference number is increased by one for each tracing operation.
- the reference number is stored in the subscriber data register WFR in the access node An.
- the subscriber data register WFR learns the a IMSI code corresponding to the IMEI code from the call initiating messages. In an embodiment, this data is stored in the subscriber data register WFR. The data is retrieved from the register WFR for the conversion of the tracing procedure.
- the subscriber data register WFR takes care that tracing started on the basis of the IMEI code is continued as IMSI tracing.
- the access node AN uses means 4 to generate a report about the call being traced.
- These means 4 comprise e.g. program blocks specialized in the Abis interface in the access node AN.
- the report presents the IMEI code, the corresponding reference number and the IMSI code.
- the report is presented to the operator e.g. as a response produced by the network management system NMS.
- the access node AN comprises means 5 for generating an alarm corresponding to the situation. These means 5 can be implemented e.g. in the subscriber data register WFR.
- the information given in the alarm includes the IMEI code, location area and call event for the telecommunication terminal.
- FIG. 2 presents a flow diagram of an embodiment of the method of the invention.
- IMEI tracing is activated via the network management system NMS or directly by using an MML terminal connected to the access node AN.
- the operator adds the IMEI code to a list of identity codes to be traced, which is located in the equipment identity register EIR of the access node AN, block 10 .
- the list may be black, gray, white or unknown.
- the effect of each list on a call may be either: 1) call allowed; 2) call allowed and traced; or 3) call inhibited.
- IMEI codes are verified by the wireless fixed register WFR; one of the verifications results in the activation of IMEI tracing, block 11 .
- the IMEI tracing is preferably a separate tracing process, in other words, it will not be carried out in conjunction with the next call event.
- the subscriber data register WFR generates a reference number from the IMEI tracing and retrieves the IMSI code corresponding to the same telecommunication terminal MS, block 12 .
- the subscriber data register WFR sends the tracing started as IMEI tracing further as IMSI tracing, i.e. a tracing conversion is performed, block 13 .
- the subscriber data register WFR generates a tracing report, which comprises the IMEI code and IMSI code as well as the reference numbers, block 14 .
- the network management system NMS collects and outputs the information for the operator, block 15 .
Abstract
Description
- The present invention relates to telecommunication systems, in particular WLL systems.
- WLL system (WLL, Wireless Local Loop) refers to a system in which a subscriber is connected to a telephone network via a wireless link system. The wireless link system can be implemented using mobile communication technology, such as GSM technology (GSM, Global System for Mobile communications). The subscriber interface is implemented using a special telecommunication terminal.
- In a WLL system, the subscriber's telecommunication terminal is connected via a radio link to a telephone exchange or an access node. Between the telecommunication terminal and the telephone exchange or access node there is a base station, by means of which call signals received from the telecommunication terminal by radio are transmitted via the telephone exchange or access node further to the public telephone network and vice versa. The access node is connected to the telephone exchange e.g. using a V5.1 or V5.2 protocol.
- Open interfaces (V5.1 and V5.2) between an access node and a telephone exchange are defined in the ETSI (European Telecommunications and Standards Institute) standards. V5 interfaces enable subscribers belonging to a physically separate access network, which may be a wired or a wireless network, to be connected using a standard telephone exchange interface.
- Call tracing is a necessary function in the WLL system. Tracing is used to collect information about call-time events related to a given subscriber, such as the radio channel used, power level, location, call setup direction, duration or start time. The call tracing function can be used to locate faults in the wireless link system, to locate stolen terminals or mischief caused in the network via a terminal, or to prevent illicit use of a terminal.
- Previously known tracing methods used in the GSM system are those based on IMSI and IMEI. According to its definition, IMSI (International Mobile Subscriber Identity) is a code consisting of the mobile subscriber's national identity code and a mobile communication country code, allowing unambiguous identification of the mobile subscriber. Where card-controlled telecommunication terminals are used, the international mobile subscriber identity code is card-specific, in other words, the user is identified on the basis of the SIM card (SIM, Subscriber Identity Module) placed in the telecommunication terminal and not on the basis of the terminal device itself. IMEI (International Mobile station Equipment Identity) is a code by which the telecommunication terminal can be unambiguously identified. The ETSI standard describes both IMSI and IMEI based tracing methods. Managing all the information generated as a result of different types of tracing is a complicated task which occupies resources of both the network management system and the operator. The operator must have separate means for IMSI and IMEI tracing procedures. Thus, both the means and the associated training for their use are a source of expenses to the operator.
- The object of the present invention is to solve the problems described above. A specific object of the invention is to disclose a new type of method and system for tracing subscriptions in a WLL system.
- The invention relates to a method for tracing a subscription in a telecommunication system comprising a local exchange, an access node connected to the local exchange, a wireless link system connected to the access node and a telecommunication terminal connected to the access node via the wireless link system. Moreover, an IMEI code corresponding to the telecommunication terminal and an IMSI code corresponding to the subscriber are defined in the telecommunication system. In the method of the invention, the access node starts the tracing of a subscription on the basis of the IMEI code and converts the tracing into an IMSI tracing procedure, so that the means intended for tracing in the access node only see the IMSI tracing procedure. In an embodiment of the invention, a reference number is generated on the basis of IMEI tracing and this number is linked with the IMSI tracing. The IMEI tracing is preferably activated for a telecommunication terminal listed in the equipment register of the access node as a device to be traced.
- In a preferred embodiment, a tracing report is generated which comprises the IMEI code, IMSI code and reference number. The IMSI code corresponding to the IMEI code is preferably retrieved from a subscriber data register. The IMSI code may also be taken from the call initiating messages. In an embodiment, an alarm is generated in conjunction with a call by a terminal without a subscriber identity module, in which case e.g. the IMEI code, location area and call event of the telecommunication terminal are presented in conjunction with the alarm.
- In an embodiment of the method, the wireless link system is based on a digital mobile communication system, such as the GSM system.
- Moreover, the invention concerns a system for the tracing of a subscription in a telecommunication system as described above. In the system of the invention, the access node comprises means for tracing a subscriber on the basis of the IMEI code and means for converting the tracing into an IMSI tracing procedure. In an embodiment, the access node comprises means for generating a reference number based on IMEI tracing and for linking the reference number with the IMSI tracing procedure. The access node preferably comprises an equipment register in which the telecommunication terminal subject to IMEI tracing is entered.
- In a preferred embodiment of the system, the access node comprises means for generating a report. The report may include the IMEI code, the IMSI code and the reference number. A system according to the invention comprises a subscriber data register comprised in the access node, said register containing the IMSI code corresponding to the IMEI code. The access node preferably comprises means for obtaining the IMSI code from the call initiating messages, allowing it to be transferred to the subscriber data register.
- In an embodiment, the access node comprises means for generating an alarm from a call by a telecommunication terminal without a subscriber identity module, the alarm comprising e.g. the IMEI code and location area and call event of the telecommunication terminal.
- In an embodiment of the system, the wireless link system used is based on a digital mobile communication system, such as the GSM system.
- The invention allows easier processing of the tracing data collected by an access node because it is now possible to utilize IMSI tracing operations and means. In the system, there is no need for separate IMEI tracing follow-up processing and associated equipment. In this way, system capacity is made available for other operations and efficiency is maximized.
- In addition, the consistency in IMEI and IMEI tracing procedures renders the operator's work easier.
- In the following, the invention will be described by the aid of a few examples of its embodiments with reference to the attached drawing, wherein
- FIG. 1 presents a diagram representing a system according to the invention; and
- FIG. 2 is a flow diagram illustrating an embodiment of the invention.
- FIG. 1 presents the components of a system according to the invention. In a WLL system, a telecommunication terminal MS is connected via a wireless link system WLL to an access node AN, which may be a DAXnode 5000 WLL manufactured by Nokia. The wireless link system WLL comprises at least one base station BS, which is connected via an Abis interface to the access node AN; in this example there are two base stations BS1 and BS2, forming
cell areas cell areas mobility area 12, which is the operating area defined in this example for the terminal MS. The access node AN is connected via a V5 interface to the local exchange LE, so that, as seen by the local exchange LE, the terminal MS in the WLL system is a normal wired-network subscriber. Communicating with the access node AN is a network management system NMS, which comprises a MML user interface, (MML, Man-Machine Language). The access node AN comprises a subscriber data register WFR (Wireless Fixed Register), which is one of the program blocks in the access node AN. - The access node AN comprises means1 for tracing a telecommunication terminal on the basis of the IMET code attached to the terminal MS. These means 1 comprise e.g.: 1) devices for the activation of tracing with MML commands; 2) actual tracing apparatus (equipment identity register EIR, subscriber data register WFR, radio interface equipment); and 3) output means, such as e.g. a network management system NMS. By means of the
tracing apparatus 2, comprising e.g. the subscriber data register WFR, IMEI tracing is converted into IMSI tracing, which means that tracing initiated as an IMEI tracing procedure is implemented using IMSI tracing equipment 6. Using the output means 3, a reference number is generated from the IMEI tracing and attached later to the IMSI tracing procedure after the conversion. These means 3 comprise e.g. the subscriber data register WFR and a program block in the access node AN specialized in MML commands. The value of the reference number is increased by one for each tracing operation. The reference number is stored in the subscriber data register WFR in the access node An. The subscriber data register WFR learns the a IMSI code corresponding to the IMEI code from the call initiating messages. In an embodiment, this data is stored in the subscriber data register WFR. The data is retrieved from the register WFR for the conversion of the tracing procedure. Based on the IMEI code, the subscriber data register WFR takes care that tracing started on the basis of the IMEI code is continued as IMSI tracing. Using means 4, the access node AN generates a report about the call being traced. These means 4 comprise e.g. program blocks specialized in the Abis interface in the access node AN. The report presents the IMEI code, the corresponding reference number and the IMSI code. The report is presented to the operator e.g. as a response produced by the network management system NMS. - With a telecommunication terminal MS, it is also possible to make calls without a subscriber identity module, i.e. SIM card. That is the situation e.g. in the case of emergency calls or in cases of intentional mischief committed by a user in the network. The access node AN comprises means5 for generating an alarm corresponding to the situation. These means 5 can be implemented e.g. in the subscriber data register WFR. The information given in the alarm includes the IMEI code, location area and call event for the telecommunication terminal.
- FIG. 2 presents a flow diagram of an embodiment of the method of the invention. IMEI tracing is activated via the network management system NMS or directly by using an MML terminal connected to the access node AN. The operator adds the IMEI code to a list of identity codes to be traced, which is located in the equipment identity register EIR of the access node AN, block10. As to its type, the list may be black, gray, white or unknown. The effect of each list on a call may be either: 1) call allowed; 2) call allowed and traced; or 3) call inhibited. IMEI codes are verified by the wireless fixed register WFR; one of the verifications results in the activation of IMEI tracing, block 11. The IMEI tracing is preferably a separate tracing process, in other words, it will not be carried out in conjunction with the next call event.
- The subscriber data register WFR generates a reference number from the IMEI tracing and retrieves the IMSI code corresponding to the same telecommunication terminal MS, block12. The subscriber data register WFR sends the tracing started as IMEI tracing further as IMSI tracing, i.e. a tracing conversion is performed, block 13. In addition, the subscriber data register WFR generates a tracing report, which comprises the IMEI code and IMSI code as well as the reference numbers, block 14. The network management system NMS collects and outputs the information for the operator, block 15.
- The invention is not restricted to the examples of its embodiments described above, but many variations are possible within the scope of the inventive idea defined in the claims
Claims (16)
Applications Claiming Priority (3)
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FI982377A FI106508B (en) | 1998-11-02 | 1998-11-02 | A method and system for tracing a local loop |
PCT/FI1999/000915 WO2000027153A1 (en) | 1998-11-02 | 1999-11-02 | Method and system for tracing a subscription |
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- 1999-11-02 AU AU11633/00A patent/AU1163300A/en not_active Abandoned
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US8489546B2 (en) | 2007-09-10 | 2013-07-16 | Theodore S. Rappaport | Clearinghouse systems and methods for collecting or providing quality, service, or asset information pertaining to wireless communications |
US8515925B2 (en) | 2007-09-10 | 2013-08-20 | Theodore S. Rappaport | Clearinghouse system, method, and process for inventorying and acquiring infrastructure, monitoring and controlling network performance for enhancement, and providing localized content in communication networks |
US8572117B2 (en) | 2007-09-10 | 2013-10-29 | Theodore S. Rappaport | Clearinghouse system and method for gaining access to use properties for carrier-based services |
US8725700B2 (en) | 2007-09-10 | 2014-05-13 | Theodore S. Rappaport | Clearinghouse systems and methods for collecting or providing quality or performance data for enhanced availability of wireless communications |
Also Published As
Publication number | Publication date |
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FI982377A0 (en) | 1998-11-02 |
AU1163300A (en) | 2000-05-22 |
FI982377A (en) | 2000-05-03 |
US6459893B2 (en) | 2002-10-01 |
FI106508B (en) | 2001-02-15 |
WO2000027153A1 (en) | 2000-05-11 |
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