MXPA99003731A - System and method of detecting and preventing fraudulent telephone calls in a radio telecommunications network - Google Patents

Abstract

A system and method for detecting a fraudulent call origination in a radio telecommunications network having a subscriber's home Home Location Register (HLR) (14) for storing a stored location for a mobile station (11), a serving Mobile Switching Center (MSC) (12) in which the call origination is initiated, and a MSC-Location (MSC-L) (15) covering the location for the mobile station stored in the home HLR (14). The serving MSC (12) sends a reporting message to the home HLR (14) when a call is originated from the mobile station in the serving MSC. The reporting message indicates a reported location for the mobile station (11). The home HLR then sends paging request messages (18) to the serving MSC (12) and the MSC-L (15) requesting the serving MSC to page the mobile station in the reported location and requesting the MSC-L to page the mobile station in the stored location. Each MSC pages the mobile station and sends a paging result to the home HLR (14). The home HLR compares the stored location to the reported location, and analyzes the locations and the paging results to determine whether the call origination is fraudulent. If the call origination is determined to be fraudulent, the call is disconnected, and the mobile station is barred from originatingcalls until a proper personal identification number (PIN) code is entered.

Description

SYSTEM AND METHOD GOES TO DETECT AND AVOID FRAUDULENT TELEPHONE CALLS IN A RADIO COMMUNICATIONS NETWORK BACKGROUND OF THE INVENTION TECHNICAL FIELD OF THE INVENTION This invention relates to telecommunications systems and, more particularly, to a system and method for detecting and avoiding fraudulent long-distance telephone calls in a radiocommunication system. DESCRIPTION OF THE RELATED TECHNIQUE In existing telecommunication networks, fraudulent users may attempt to make long distance telephone calls free of charge by causing the network to recognize the calls as if they were made by a legitimate subscriber. Fraudulent users can clone the legitimate subscriber's mobile phone, including the electronic serial number (ESN) and the mobile identification number (MIN). Then, the cloned telephone appears on the network as if it were the subscriber's legitimate telephone, thus allowing a fraudulent user to make illegitimate long-distance telephone calls. Although there are no teachings in the prior art of a solution to the aforementioned deficiency and limitation such as what is presented here, US Patent No. 4, 955, 049 to Ghisler comments on a subject that has a certain relationship with what is said. here. Ghisler presents a method to monitor subscribers in a mobile phone system to detect the fraudulent use of a mobile phone. Ghisler assigns a predetermined sequence of numbers to each mobile phone in the system. Each time a subscriber makes a call, the next number is transmitted in the sequence assigned to the mobile telephone by the mobile station to the mobile service switching center (MSC). The MSC records the numbers used and detects a fraudulent call if there is an interruption in the sequence. However, Ghisler requires modification of each mobile station to store its assigned sequence of numbers and transmit the next number in the sequence each time a call is made. It would be helpful to have a method to detect fraudulent telephone calls that does not require modification of the mobile station. U.S. Patent No. 5,309,501 to Kozik et al. (Kozik) presents a modular switching system to detect -mobile stations fraudulently identified in a cellular mobile telecommunications network. Kozik is a switching-based fraud detection system that examines a state transition class to see if a particular mobile station state transition is likely taking into account a previous registered status of the mobile station. Unlikely state transitions are indications of possible fraud. Kozik, without However, it only works if the legitimate mobile station and the fraudulent mobile station are in the same location. The fraud detection algorithm employed in Kozik considers that there are two mobile stations in the same location, and finds an indication of fraud if both mobile stations are doing the same (ie, they are going through the same state transition) in the same location. A major disadvantage of Kozik's system and method is that fraudulent mobile stations are often not in the same location as the legitimate mobile station. The Kozik-based switching system and method will not detect fraudulent mobile stations that operate in locations other than the legitimate mobile station, especially in the coverage area of another switch. Accordingly, a system and method are required to detect fraudulent mobile stations that operate in locations other than the legitimate mobile station, and in the coverage area of different switches. The review of each of the above references does not indicate any presentation or suggestion of a system or method such as the one described and claimed here. In order to overcome the disadvantage of existing solutions, it would be helpful to have a method to detect fraudulent telephone calls in "~ a network of radiocommunications that do not require modification of the mobile station, and that detect fraudulent mobile stations that operate in different locations of the legitimate mobile station, and in coverage area of different switches. The present invention offers such a method. SUMMARY OF THE INVENTION In one aspect, the present invention is a method for detecting a fraudulent call originating in a radio network having a Subscriber Origin Location Record (HLR) to store a stored location for a mobile station, a mobile service switching center (MSC) where the origin of the call is initiated, and an MSC location (MSC-L) covering the location for the mobile station stored in HLR of subscriber source. The method includes the steps of sending a report message from the service MSC to the originating HLR or subscriber when a call originates from the mobile station in the service MSC. The address of the report message indicates a reported location for the mobile station. The method then sends voices of request messages from the originating HLR to the MSC-L and the service MSC requests that the MSC-L vocee the mobile station in a stored location, and requests that the service MSC voices the station mobile in the reported location. The MSC-L and the service MSC call the mobile station and send results of vocee to the HLR of origin. The HLR of origin performs the steps of comparing the stored location with the reported location, and of analyzing the stored location, the reported location, and the results of the service MSC and MSC-L paging to determine if the origin of the call is fraudulent. The step of comparing the stored location with the reported location can include the determination of whether the stored location and the reported location are identical. The step of analyzing the paging result to determine if the origin of the call is frudulent may include the determination or the origin of the call is fraudulent when the stored location and the reported location are identical, and the result of the paging of the service MSC indicates that there was a paging response from the mobile station, or no response was received from the mobile station, and the mobile station was not busy. In addition, the origin of the call may be determined to be fraudulent when the stored location and reported location are different, and the MSC-L paging result indicates that there was a paging response from the mobile station, or there was no response of paging because the mobile station was busy. In another aspect, the present invention and its system for detecting a fraudulent call origin of a mobile station in a radio network having a plurality of mobile switching centers (MSCs) and a subscriber source location register (HLR) that stores a stored location for the mdviL station. The system includes a mobile service switching center (MSC) where the origin of the call is initiated, the service MSC which includes a device for sending a report message from the service MSC to the originating HLR when it originates a long distance call from the mobile station in the service MSC. The address of the report message indicates a reported location for the mobile station. The service MSC includes a device for voicing the mobile station at the reported location, and a device for sending a paging result from the service MSC to the originating HLR. The system also includes an MSC location (MSC-L) that provides radio coverage for the location of the mobile station stored in the originating HLR. The MSC-L includes a device for voicing the mobile station in the stored location at the request of the originating HLR, and a device for sending a paging result from the MSC-L to the originating HLR. The system also includes a device within the originating HLR for sending a paging request message to the service MSC and the MSC-L for voicing the mobile station in the stored location, a device within the originating HLR for comparing the stored location with the reported location, and a device within the originating HLR to analyze the stored location and the reported location, and the paging result to determine if the origin of the call is fraudulent. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and its numerous objects and advantages will be more apparent to those skilled in the art with reference to the following drawing, in combination with the appended specification, wherein: Figure 1 is a block diagram that illustrates components of a radio network associated with the present invention; Figure 2 is a message signaling diagram illustrating the flow of messages between the nodes of a telecommunications network when carrying out the method of the present invention; and Figures 3A-3B are a flow chart illustrating the steps in the method for detecting and avoiding fraudulent telephone calls, in accordance with the teachings of the present invention. DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Figure 1 is a block diagram illustrating the components of a radio network associated with the present invention. In Figure 1, an arbitrary geographic area can be divided into a plurality of areas of continuous radio coverage, or C1-C5 cells associated with a first plant, and C6-C10 cells associated with a second plant. Even though the system of Figure 1 illustrates only 10 cells, it is clear that in practice the number of cells will be much greater. Associated with each of the C1-C10 cells and located within each of the C1-C10 cells is a base station designed as a corresponding base of a plurality of base stations B1-B10. Each of the base stations B1-B10 includes a transmitter, a receiver, and a base station controller as is well known in the art. In Figure 1, the base stations B1-B10 are selected to be located in the center of each of the C1-C10 cells, respectively, and are equipped with omnidirectional antennas. However, in other configurations of a radio network, the base stations B1-B10 may be located near the periphery or otherwise away from the centers of the C1-C10 cells and may illuminate the C1-C10 cells with radio signals either omnidirectionally or directionally. Accordingly, the representation of the telecommunications network of Figure 1 is only to illustrate and not to limit the possible implementations of a mobile radio system within which a mobility restriction process may be implemented. The base stations B1-B5 are connected by communication links 2 (for example, cables, microwave links, etc.) to a mobile service switching center (MSC) 12. Base stations B6-B10 are connected by relay links. communication 2 to an MSC location (MSC-L) 15. In the relevant connections between the service MSC 12, the MSC-L 15 and the base stations B1-B10 are not fully illustrated in figure 1 but are well known of people with certain knowledge in the technique. Referring continuously to FIG. 1, a mobile station 11 is illustrated within a cell C2, and a mobile station 11b is illustrated within cell C7. The mobile station 11 b is illustrated in dashed lines, in the discussion here, it is initially unknown whether the mobile station 11 b is in fact the mobile station 11 a or a fraudulent mobile station. Only 2 mobile stations are illustrated in Figure 1, but it will be understood that the actual number of mobile stations can be much larger and, in practice, will greatly exceed the number of base stations. In addition, mobile stations lia and 11b are illustrated in only one of the C1-C10 cells. The presence or absence of mobile stations in any particular cell C1-C10 will in practice depend on the individual wishes of the subscribers using mobile stations 11 a and 11 b. Subscribers can move from one location in a cell to another location either from a cell to an adjacent cell in a neighboring cell, or from a central served by an MSC to another central while receiving and placing calls both within the radio network 10 as well as in the public switched telecommunications network (PSTN) connected to the radio network through its MSCs. Each of the mobile stations 11 a and 11 b can initiate or receive a telephone call through one or more of the base stations B1-B10 and the service MSC 12 or MSC-L 15. These calls can be voice communications or data. Each of the C1-C10 cells receives a plurality of voice channels and at least one access channel or control channel, such as a forward control channel (FOCC). The control channel is used to control or monitor the operation of the mobile station by means of the information transmitted and received from these units, which are known as messages. Control and administration messages within the radio network are sent in accordance with industry-standard air interface standards, such as AMPS and EIA / TIA 553, standards for analog cellular operations, and / or D-AMPS , IS-54B, and IS-54C, the standards for digital cellular operations, which are incorporated herein by reference. While these standards govern operations in North America and other selected regions, standards similar govern other geographical areas in the world, and are well known in the art. Information exchanged between base stations and mobile stations through beats can include incoming call signals, outgoing call signals, paging signals, paging response signals, location registration signals, voice-channel assignments , maintenance instructions, as well as transfer instructions according to the mobile stations leave the radio coverage of a cell and penetrate the radio coverage of other cells, as well as other additional information elements such as numbers of callers, information of time, and the like. The control channels 02 can operate either in analog or digital mode or a combination thereof based on industry standards. Integrated services between different exchanges are provided by using the specification between the IS-41 system, which is incorporated herein by reference. Subscriber profile information, location information, as well as status information for each mobile subscriber are stored in an Associated Origin Location Record (originating HLR) 14. Originating HLR 14 is connected by signaling lines 3 to MSC 12 of service and to MSC-L 15. The present invention is a fraud detection system based on HLR of origin and method in where HLR 14 subscriber source is programmed to recognize situations where calls in progress can be determined as fraudulent. In such cases, calls in progress are disconnected and the fraudulent user can not make additional calls. The legitimate subscriber can access the network and make calls after registering an appropriate personal identification number (PIN) code. Figure 2 is a message signaling diagram illustrating the flow of messages between the nodes of a telecommunications network when carrying out the method of the present invention. The telecommunication network includes mobile stations 11 a and 11 b (which can be a mobile station in two possible locations), a mobile service switching center (service MSC) 12, a dissipated origin location register (HLR dissipated) 13, an HLR of subscriber source 14, and an MSC location (MSC-L) 15 that covers the location stored in the originating HLR 14 as the location of the mobile station 11. When a long-distance telephone call originates 16 by employing the mobile station 11 a, the MSC handling this call (the service MSC 12) sends a report message 17 to the HLR 14 of subscriber source and includes the dialed telephone number stored both the MSC 12 of service as in the HLR 14 of origin. The address of the report message 17 indicates the location of the mobile station. The originating HLR 14 compares the location information of the report message 17 with the information stored in the originating HLR 14 as to the location and status of the mobile station 11 a. This comparison can result in 6 different cases: (1) The newly reported location of the mobile station is identical to the stored location of the originating HLR, and the state of the mobile station in the originating HLR is inactive; (2) The newly reported location of the mobile station is identical to the location stored in the originating HLR, and the state of the mobile station in the HLR is active; (3) The newly reported location of the mobile station is identical to the location stored in the originating HLR, and the state of the mobile station in the originating HLR is active; (4) The newly reported location of the mobile station is different from the location stored in the originating HLR, and the state of the mobile station in the originating HLR is inactive; (5) The newly reported location of the mobile station is different from the location stored in the originating HLR, and the state of the mobile station in the HLR whose origin is active; Y (6) The newly reported location of the mobile station is different from the location stored in the originating HLR, and the mobile station status in the originating HLR is occupied. If the state of the mobile station is occupied, there is an immediate indication of fraud since a single mobile station can not be making a call in airtime and originating a new call at the same time. If the state of the mobile station is active or inactive, the process continues. If the newly reported location of the mobile station is different from the location stored in the originating HLR, the originating HLR 14 then sends a paging request message 18 to the MSC-L15 which covers the location stored in the originating HLR as the location of the mobile station. The mobile station in this location in this location is illustrated as mobile station 11 b, but is considered by the network as the mobile station 11 a at this time. The paging request message 18 requires the MSC-L to call the mobile subscriber station 11 b at the location stored in the originating HLR 14. The originating HLR 14 also sends a paging request message 18 to the serving MSC 12 which covers the reported location of the mobile station 11 a. The paging request message 18 a requests that the service MSC voices the mobile subscriber station 11 a on the location reported. E MSC-L 15 voices mobile station 11 b at the location stored at 19 and receives either a response or no response at 21. If there is no response from the mobile station, the MSC-L searches for data from its own registers a subscriber record indicating that the mobile station is currently making a call (ie, a "marked as busy" record). If a record as busy is found, in MSC-L15 a busy indication returns to the source HLR 14 in the paging return result 22 if a record marked as busy is not found, the MSC-L15 returns an indication of no response (i.e., mobile station 11 b is inactive) to source HLR 14 in the returned 22 paging return. When receiving a paging response from the mobile station, the MSC-L returns a paging reply indication in the paging return result 22 without any attempt to locate a subscriber record. For greater reality then, when it is established that the mobile station returns to a "busy indication", it is understood that the mobile station does not respond to the call, and the calling MSC finds a subscriber record marked busy. In the same way, an "absence of response" from the mobile station indicates that the mobile station does not respond to the paging, and the paging MSC does not find a subscriber record marked busy. In addition, a "response from "paging" indicates that a paging reply is received from the mobile station, and the paging MSC returns "an indication of paging response in the paging return result without any attempt to locate a subscriber record. or about the same time as the MSC-L15 calls the mobile station 11 b at the stored location, the service MSC 12 to the mobile station 11 a at the location reported at 19. The service MSC receives either a response , a busy indication, or no response from the mobile station 11 a in 21 a.The MSC-L15 returns the result to the originating HLR at 22, and the service MSC returns the result to the originating HLR at 22 a. Each time a busy indication is returned in the paging return result message, the return result message includes the called number to which the mobile station is connected.A number called which is different from the new call 16 is an i Fraud notification. In addition, if several paging responses are received, this means that it is a fraud. When the newly reported mobile signaling location is identical to the location stored in the originating HLR 14, the originating HLR sends a paging request message 23 to the serving MSC 12. The service MSC 12 voices the mobile station at 24 even though a call has just been originated by the mobile station within the service MSC. Limiting systems are also voiced in accordance with standard paging procedures. The service MSC receives a response, a busy indication, or no response, at 25 and returns the result of the paging 26 to the originating HLR 14. If the response is a busy indication, the service MSC includes in the return result message, the called number to which the mobile station is connected. The originating HLR 14 then analyzes in 27 the reported and stored location information and the returned paging result 22 or 26 in order to determine whether the new call 16 is fraudulent. The analysis when the locations are different from those in Table 1.

The analysis when the locations are identical appears in table 2 below.

Table 2 In cases where the originating HLR 14 determines that the call 16 is fraudulent, the originating HLR may at this point instruct the service MSC 12 to disconnect the call at 28. The disconnect message 28 is a new one. message in IS-41. In existing systems, the network operator can manually intervene to disconnect a call. The originating HLR 14 then prohibits mobile station 11 a and 11 b from making additional calls at 29 until the subscriber registers an appropriate PIN code.

If a fraud can not be determined due to a busy indication received from the service MSC 12, as in the cases in tables 1 and 2, no action is taken, and the originating HLR continues to analyze the called telephone number sent to the HLR of origin with the result of return of paging when the mobile station is in busy state. When the mobile device 11 a originates a telephone call, the called telephone number is stored in the subscriber register in the originating HLR 14. The originating HLR 14 then compares the called telephone number stored in the subscriber record with the called telephone number returned to the originating HLR in the paging return result message when the mobile station is busy. The originating HLR 14 may then request that all MSCe in the subscriber source area voce the mobile station if the call originated outside the subscriber's home area, but there is either a paging response or a busy indication from the mobile station in one of the home area MSCs, then the originating HLR determines that fraud exists, and orders the service MSC to disconnect the call. If the call originated outside of the originating area of the originator, and none of the originating area MSCs returns a spouse reply or a indication of busy from the mobile station, or if the call originated within the subscriber's home area, then the seventh can not conclude that fraud exists. The source HLR 14 then stable the activity state for the mobile station in busy state. Finally, at the end of the suspicious call, the service MSC notifies the originating HLR of the end of the call. The call may be timed, and if the length of the call exceeds a certain period of time, the network operator may call the subscriber after terminating the call to verify the identification of the subscriber. Alternatively, the network may automatically require the subscriber to register a PIN code before making any additional calls. This step can be implemented after all long-distance long-distance calls, or when the mobile phase activity indication in the originating HLR is inactive and the mobile signal originates a call. The originating HLR then establishes the activity status of the mobile station as active. Figures 3A-3B are a flow diagram illustrating the steps in the method for detecting and preventing fraudulent telephone calls, in accordance with the teachings of the present invention. Starting with Figure 3A, step 31, a subscriber originates a long distance call 16 using the mobile station 11 a. In step 32, the MSC of 12 sends a report message to the subscriber-originating HLR 14. In step 33, the originating HLR checks the activity state stored for mobile station 11 a for the purpose of determining whether or not the activity status is busy . If the stored activity state is busy, then an indication of fraud exists, and the originating HLR instructs the service MSC 12 to disconnect call 16 in step 34. In originating HLR it prevents the subscriber from making calls afterwards. in step 35 until you register an appropriate PIN code. If the stored activity state is not occupied, the method moves to step 36 where the originating HLR compares the reported location with the subscriber's stored location to the originating HLR and determines whether the locations are different or identical. If the locations are different, the method ee moves to step 37 where the originating HLR 14 orders the service MSC 12 calling the subscriber mobile station 11, and instructs the MSC-L 15 to call the mobile station 11 b in the stored location. The serving MSC and the MSC-L vocate the mobile station and return the paging results to the originating HLR in step 38. In step 39, the result of the paging coming from MSC-L15 is analyzed in the originating HLR 14 . If a paging response or a busy indication is received, then the The method determines that the call is fraudulent, and moves to step 46 where the originating HLR 14 instructs the service MSC 12 in the direction that the call is disconnected. The method then passed to step 47 where the originating HLR 14 prevents the subscriber from making calls until an appropriate PIN code is registered. However, if the paging result at 39 does not indicate the absence of response, the method moves to step 40 and analyzes the paging result of the service MSC 12. If no response is received or if a response is received of paging, then the method determined that the call is fraudulent, and moves to step 46 where the originating HLR 14 instructs the service MSC 12 in the direction of disconnecting the call. The method then moves to step 47 where source HLR 14 prevents the subscriber from making calls until an appropriate PIN code is registered. However, if the result of paging at 40 is a busy indication, the method moves to step 41 where no action is taken since it can not be determined whether the call is fraudulent. The method is moved after step 41 to FIG. 3 B, step 51 and continues its analysis. If the locations are determined to be identical in step 36, the method is moved to step 42 where the originating HLR gives commands to the serving MSC 12 to call the mobile station into the stored / reported location. The MSC The mobile station voices the mobile station and returns the paging result to the originating HLR in step 43. In step 44, the paging results are analyzed in the originating HLR 14. If a busy indication is received, then the The method is moved to step 45 where no action is taken since it can not be determined if the call is fraudulent. The method then goes to Figure 3 B, step 51 and continues its analysis. However, if the paging result at 43 indicates absence of response or a paging response, the method determines that the call is fraudulent, and goes to step 46 where the originating HLR 14 instructs the service MSC 12 in the sense of disconnecting the call. The method then proceeds to step 47 where the source HLR 14 prevents the subscriber from making calls until an appropriate PIN code is recorded. From Figure 3 A, Step 41 or Step 45 the method proeigates up to Figure 3 B, Step 51 where the originating HLR 14 determines whether or not the called number in the paging return result is the same number as the called number stored in the HLR. If the called numbers are different, it is an indication of fraud, and the method moves to step 52 where the originating HLR instructs the service MSC 12 to disconnect the call. The method then goes to step 53 where the originating HLR prevents the subscriber from making additional calls until the e-registrator has registered an appropriate PIN code. However, if in step 51 the called numbers are the same, the method moves to step 54 where it is determined whether or not the call 16 originated outside the subscriber's origin area. If the call originated outside the subscriber's home area, the originating HLR 14 requests that all MSCs in the home area voice the mobile station in step 55. The home area MSCs then call the mobile station and return their paging results to the source HLR 14. In step 56, the originating HLR analyzes the paging results and determines whether any of the source area MSCs returned either a paging response or a busy indication. If either a paging response or a busy indication was returned, the method moves to step 57 where the originating HLR instructs the serving MSC 12 to disconnect the call. The method then moves to step 58 where the originating HLR prevents the subscriber from making additional calls until the signer has registered an appropriate PIN code. However, if in step 54 the call did not originate outside the subscriber source area, the method moves to step 59. In the same way, if none of the originating area MSCs returns a paging response or a busy indication, the method moves to step 59 where it is established that the activity status of the mobile station is occupied. The method then goes to step 61 where at the end of the call 16, the service MSC 12 notifies the call originating HLR of length. In step 62, the originating HLR compares the length of the call against a predetermined time period. If the length of the call exceeds the predetermined time period, the method is shifted in step 63 when the subscriber identity is verified by the network operator. The originating HLR then sets the activity status of the active mobile station to 64. However, if in step 62 it is determined that the call length does not exceed the predetermined period of time, the method goes directly to step 64 where the originating HLR establishes the activity status of the mobile station as active. It is therefore believed that the operation and construction of the present invention will be apparent from the foregoing description. While the illustrated and described method, apparatus and system have been characterized as preferred, it will be readily apparent that various changes and modifications may be made without departing from the spirit or scope of the present invention in accordance with that defined in the following claims.

Claims (30)

1. CLAIMS 1. A method for detecting a fraudulent call origin in a radiocommunication network having a originator location registration (HLR) for storing an indication of activity statuses regarding the mobile subscriber station, and a center Service Modem Switching (MSC) wherein said call origin is initiated, said method comprises the steps of: sending a report message from said service MSC to said HLR when a call originates from said mobile station in said service MSC; determine whether said indication of stored activity status is busy state; and determining that said call origin is fraudulent in determining that said indication of stored activity status is busy state.
2. 2. The method for detecting a fraudulent call origin in a radiocommunication network of claim 1, further comprising the step of giving intructions to said service MSC to disconnect said call origin.
3. 3. The method for detecting a fraudulent call origin in a radio network of claim 1, further comprising the step of preventing said subscriber from making calls until said originator has registered a personal identification number code. appropriate (NIP).
4. 4. A method for detecting an origin of fraudulent calls in a radio network having a Subscriber Source Location (HLR) record for storing a stored location for a mobile station, and a plurality of Mobile Switching Centers (MSCs) which include a service MSC in which said call origin initiates, and a location MSC (MSC-L) encompassing the location for the mobile station stored in said subscriber source HLR, said method comprising the steps of: sending a report message from said service MSC to said HLR when a call is originated from said mobile station in said service MSC, reporting a message indicating a location reported for said mobile station and including a dialed telephone number; compare said stored location with said reported location; send a paging request message of said HLR of origin to said MSC-L requesting said MSC-L to call said mobile station in said stored location when said stored location is different from said reported location; voicing said mobile station in said stored location; sending a paging result of said MSC-L to said originating HLR; sending a call request message from said originating HLR to said service MSC requesting said service MSC to call said mobile station at said reported location; voicing said mobile station at said reported location; sending a paging result of said service MSC to said originating HLR; and analyzing said stored location and said reported location, and said paging results of said service MSC and said MSC-L to determine if said call origin is fraudulent.
5. 5. The method of detecting a fraudulent call origin in a radio network of claim 4, wherein said step of analyzing said stored location and said reported location and said paging results of said service MSC and said MSC-L for determining the said origin of calls is fraudulent, includes the determination if said origin of call is fraudulent when said stored location and said reported location are different, and said result of said MSC-L is a response of said mobile eetation .
6. 6. The method for detecting a fraudulent call origin in a radio communication network of claim 4, wherein said step of analyzing said stored location and said reported location, and said paging results of said service MSC and said MSC-L to determine if said call origin is fraudulent includes determining whether said call origin is fraudulent when said stored location and said reported location are different, and said paging result of said MSC-L is a busy indication of said mobile station.
7. The method for detecting a fraudulent call origin in a radio network of claim 4, further comprising the step of disconnecting the origin of the call by determining that said call origin is fraudulent.
8. 8. The method for detecting a fraudulent call origin in a radio network of claim 4, further comprising the step of preventing call origins of said mobile station by determining that said call origin is fraudulent, until a registration is recorded. appropriate personal identification number (PIN) code.
9. 9. The method for detecting a fraudulent call origin in a radio network of claims 4, further comprising the steps of: storing in said originating HLR, a called number for each call in process; determine if the called number reported in said report message is identical to the called number stored in the HLR of origin for the call origin; and disconnecting the call origin by determining that the called number reported in said report message is different from the called number stored in the originating HLR for the origin of the call.
10. 10. The method for detecting a fraudulent call origin in a radio network of claim 9, further comprising the steps of: determining whether the origin of the call originated outside of the subscriber's source area, by determining that the The called number reported in said report message is identical to the called number stored in the originating HLR for the origin of the call, sending a call request message from said originating HLR to a
11. ll MSCs in the originating area of the originating subscriber, when determining that said origin of call "originated outside the area of origin of subscriber; determining if any of said MSCs in the subscriber source area returned a paging reply from said mobile station; disconnecting the origin of the call by determining that one or more of said MSCs in the subscriber source area returned a paging response; determine whether one of said MSCs in the subscriber source area returned a busy indication of said mobile station; and disconnecting the call origin by determining that one or more of said MSCs in the subscriber source area returned a busy indication. The method for detecting a fraudulent call origin in a radio network of claim 9, further comprising the steps of: determining whether the origin of the call originated outside the subscriber's home area, by determining that the number The call reported in said report message is identical to the called number stored in the originating HLR for the call origin; send an activity status for said subscriber in Employed in said HLR of origin; sending, when said call origin has ended, a message of said service MSC notifying said originating HLR of a length of said call origin; determining in said home HLR if said call origin exceeds a predetermined period of time; verify the subscriber identification by determining that said call origin exceeded the predetermined time period; and establish said activity status for said active sponsor in said HLR of origin.
12. 12. A method to detect a fraudulent origin of call in a radio network having a originator location registry (HLR) to store a stored location for a mobile station and a Mobile Service Switching Center (MSC) where said origin of call is initiated, said method comprises the steps of: sending a report message of said service MSC to said originating HLR when a call originates from said mobile station in said service MSC, said report message indicates a reported location for said mobile station and includes a number phone called; compare said stored location with said reported location; sending a paging request message from said originating HLR to said service MSC requesting said service MSC to void said mobile station at said stored location when said stored location is identical to said reported location; voicing said mobile station in said stored location; sending a paging result of said service MSC to said originating HLR; and analyzing said stored location and said reported location, and said paging result of said service MSC to determine if said call origin is frudulent.
13. 13. The fraudulent call origin detection method in a radio communication network of claim 12, wherein said step of comparing said stored location with said reported location includes determining whether said stored location and said reported location are identical.
14. 14. The method for detecting a fraudulent call origin in a radio network of claim 13, wherein said step of analyzing said stored location and said reported location, and said paging result of said service MSC to determine if said call origin is fraudulent includes the determination that said call origin is fraudulent when said stored location and said location reported are identical, and said paging result from said service MSC indicates that there is no response from said mobile station.
15. The method for detecting a fraudulent call origin in a radio network of claim 13, wherein said step of analyzing said stored location and said reported location, and said paging result of said service MSC to determine whether said origin of The fraudulent call includes the determination that said call origin is fraudulent when said stored location and said reported location are identical, and said paging result of said service MSC indicates that there is a paging response from said mobile station.
16. 16. The method for detecting a fraudulent call origin in a radio network of claim 12, further comprising the steps of: storing in said source HLR, a called number for each call in progress; determine if the called number reported in said report message is identical to the called number stored in the originating HLR for the origin of the call; and disconnecting the origin of the call by determining that the called number reported in said report message is different from the called number stored in the originating HLR for the call origin.
17. The method for detecting a fraudulent call origin in a radio network of claim 16, further comprising the steps of: determining whether the origin of the call originated outside the subscriber's home area, by determining that the number The call reported in said report message is identical to the called number stored in the originating HLR for the origin of the call; sending a paging request message from said originating HLR to all MSCs in the subscriber source area, upon determining that said originating call originated outside the subscriber's home area; determining whether any of said MSCs in the subscriber source area returned a paging response from said mobile station; disconnecting the origin of the call by determining that one or more of said MSCs in the subscriber source area returned a paging response; determining whether any of said MSCs in the subscriber source area returned a busy indication of said mobile station; and disconnecting the origin of the call by determining that one or more of these MSCs in the subscriber source area returned a busy indication.
18. 18. The method for detecting a fraudulent call origin in a radio network of claim 16 further comprising the steps of: determining whether the call origin originated outside the subscriber's home area, by determining that the called number reported in said report message it is identical to the called number stored in the originating HLR for the call origin; establish a state of activity for said subscriber in occupied in said HLR of origin; sending when said call origin has ended, a message from said service MSC notifying said originating HLR of a length of said call origin; determining in said originating HLR if said origin of call exceeded a predetermined period of time; verify the subscriber identification by determining that said call origin exceeded the predetermined period of time; and establish said activity status for said subscriber in Asset in said HLR of origin.
19. 19. A system for detecting a fraudulent call origin in a radio network having a Subscriber Origin Location Record (HLR) for storing an indication of activity status of the mobile subscriber station and a Switching Center Service Mobile (M? C) wherein said call origin is initiated, said system comprises: a reporting means for sending a report message of said service MSC to said originating HLR when a call originates from said mobile station in said service MSC; means within said originating HLR to determine whether said indication of stored activity status is busy state; and a device within said originating HLR to determine that said call origin is fraudulent in determining that said indication of stored activity status is busy state.
20. 20. The system to detect a fraudulent origin of call in a radio network of claim 19, further comprising a device for instructing said service MSC to disconnect said call origin.
21. 21. The system for detecting a fraudulent call origin in a radio network of claim 19, further comprising means for preventing said subscriber from making origin calls until said subscriber registers an appropriate personal identification number code - (PIN) ).
22. 22. A system for detecting a fraudulent call origin from a mobile station in a radio network having a plurality of call centers. Mobile Switching (MSCs) and a Subscriber Origin Location Register (HLR) that stores a stored location for said mobile station, said seven to comprises: a Mobile Service Switching Center (MSC) where said call origin is initiated , said service MSC includes: a device for sending a report message of said service MSC to said originating HLR when a call originates from said mobile station in said service MSC, said report message indicating a reported location for said mobile station; Y means for sending a paging result of said service MSC to originating HLR; means within said origin HLR to compare said stored location with said reported location; an MSC-location (MSC-L) that provides radio coverage for the location for the mobile station stored in said originating HLR, said MSC-L includes: means for voicing said mobile station in said stored location; and means for sending a paging result of said MSC-L for said originating HLR; means within said originating HLR for sending a paging request message to said MSC-L for voicing said mobile station in said stored location; means within said originating HLR for sending a paging request message to said service MSC for voicing said mobile e.etition at said reported location; and means within said originating HLR to analyze said stored location and said reported location, and said paging results of said MSC-L and said service MSC to determine if said call origin is fraudulent.
23. 23. The system for detecting a fraudulent call origin in a radio network of claim 22, wherein said means for analyzing said stored location and said reported location, and said paging result to determine if said call origin is fraudulent includes a means to determine that said call origin is fraudulent when said stored location and said reported location are different, and said paging result of said MSC-L is a paging response of said mobile station.
24. 24. The system for detecting a fraudulent call origin in a radio network of claim 22, wherein said means for analyzing said stored location and said reported location, and said paging result for determining whether said call origin is fraudulent includes a means for determining that said call origin is fraudulent when said stored location and said reported location are different, and said paging result of said MSC-L is a busy indication of said mobile station.
25. 25. The system for detecting a fraudulent call origin in a radio network of claim 22, further comprising a device for disconnecting the call origin upon determining that said call origin is fraudulent.
26. 26. The system for detecting a fraudulent call origin in a radio network of claim 22, further comprising a means for preventing call origins from said mobile station to the determine that said call origin is fraudulent, until an appropriate personal identification number (PIN) code is registered.
27. 27. A system for detecting a fraudulent call origin from a mobile station in a radio network having a plurality of Mobile Switching Centers (MSCs) and a Subscriber Origin Location Register (HLR) storing a location stored for said mobile station, said system comprises: a Service Modem Switching Center (MSC) wherein said call origin is initiated, said service MSC includes: means for sending a report message of said service MSC to said service HLR of origin when a call originates from said mobile station in said service MSC, said report message indicates a reported location for said mobile station; and means for sending a paging result of said service MSC to said originating HLR; a means within said originating HLR for comparing said stored location with said reported location; means within said originating HLR for sending a paging request message to said service MSC for voicing said mobile station at said reported location when said stored location is identical to said reported location; and a means within said originating HLR to analyze said stored location and said reported location, and said paging result of said service MSC to determine whether said call origin is fraudulent.
28. 28. The system for detecting a fraudulent call origin in a radio network of claim 27, wherein said means for comparing said stored location with said reported location includes a means for determining whether said stored location and said reported location are identical.
29. 29. The system for detecting a fraudulent call origin in a radio network of claim 28, wherein said means for analyzing said stored location and said reported location, and said paging result for determining if said call origin is fraudulent includes means to determine that said call origin is fraudulent when said stored location and said reported location are identical, and said paging result indicates that there is no response from said mobile station.
30. 30. The system for detecting a fraudulent call origin in a radio network of claim 28, wherein said means for analyzing said stored location and said reported location, and said paging result to determine if said call origin is fraudulent includes a means to determine that said call origin is fraudulent when said stored location and said reported location are identical, and said paging result indicates that a paging response was received from said mobile station. SUMMARY OF THE INVENTION A system and method for detecting a fraudulent origin of calls in a radio network having a Subscriber Origin Location Record (HLR) (14) for storing a stored location for a mobile station (11), a Service Mobile Switching Center (MSC) (12) where the origin of the call is initiated, and an MSC-location (MSC-L) (15) that covers the location of the mobile station stored in the originating HLR (15) 14). The service MSC (12) sends a report message to the originating HLR (14) when a call is originated from the mobile station in the service MSC. The report message indicates a reported location for the mobile station (11). The originating HLR then sends paging request messages (18) to the service MSC (12) and to the MSC-L (15) requesting that the serving MSC voices the mobile station at the reported location and requesting that the MSC-L Voice the mobile station in the stored location. Each MSC calls the mobile station and sends a paging result to the originating HLR (14). The originating HLR compares the stored location with the reported location, and analyzes the locations and paging results to determine if the origin of the call is fraudulent. If the origin of the call is determined to be fraudulent, the call is "disconnected, and the mobile station can not originate calls until an appropriate identification number code is registered. personal (NIP).