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1 (19) (11) EP B1 (12) EUROPEAN PATENT SPECIFICATION (4) Date of publication and mention of the grant of the patent: Bulletin 07/47 (1) Int Cl.: H04L 12/8 (06.01) (21) Application number: (22) Date of filing: (4) Spam filtering for mobile communication devices Ausfiltern unerwünschter Nachrichten (Spam) für Mobilfunkgeräte Filtrage de messages de courrier électronique non sollicités (Spam) pour dispositifs de communication mobile (84) Designated Contracting States: DE FR GB () Priority: US 900 (43) Date of publication of application: Bulletin 06/08 (73) Proprietor: Lucent Technologies Inc. Murray Hill, New Jersey (US) Sharma, Alok Lisle, IL 6032 (US) (74) Representative: Sarup, David Alexander et al Alcatel-Lucent Telecom Limited Unit 18, Core 3, Workzone Innova Business Park Electric Avenue Enfield, EN3 7XU (GB) (72) Inventors: Qutub, S. Shehryar Hoffman Estates, IL (US) (6) References cited: WO-A-03/07173 WO-A-/ EP B1 Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). Printed by Jouve, 7001 PARIS (FR)

2 1 EP B1 2 Description Background of the Invention 1. Field of the Invention [0001] The invention is related to the field of wireless networks, and in particular, to systems and methods of filtering spam destined for mobile communication devices communicating with a wireless network. 2. Statement of the Problem [0002] Many people use computers daily at work or at home to access accounts. One problem facing computer users is receiving spam in their accounts. Spam is typically understood to be unsolicited s or junk s. From the sender s point-of-view, spam is a form of bulk , often to a list obtained by companies that specialize in creating distribution lists. To the receiver, spam is junk that needs to be deleted and is a risk of including a virus. Spam is roughly equivalent to unsolicited telephone marketing calls except that the user unfortunately pays for part of the spam since everyone shares the cost of maintaining the Internet. [0003] To protect against spam, some users install a spam filter on their computer or network server. A spam filter is a program that is used to detect unsolicited and unwanted s and prevents those s from getting to a user s inbox. Like other types of filtering programs, a spam filter looks for certain criteria on which it bases judgments. For example, the simplest and earliest versions can be set to watch for particular words in the subject line of messages and to exclude these from the user s inbox. This method is not especially effective as legitimate messages may be blocked while actual spam is let through. More sophisticated programs attempt to identify spam through suspicious word patterns or word frequency. [0004] Cell phones and other mobile communication devices are now equipped to transmit and receive text messages, such as Short Message Service (SMS) messages. Some cell phones are also equipped to transmit and receive multi-media messages, such as digital pictures taken by a camera phone. Unfortunately, current spam filters used on computers have not been effectively implemented to protect cell phones and other mobile communication devices from receiving spam in the form of SMS and similar-type messages. The current spam filters for computers are tailored for HTTP messages, not text or multi-media messages used by current cell phones. [000] For a typical SMS text message, the sender enters a number of the destination phone and a text message. The sender s phone transmits signaling (e.g., SS7, C7, or other signaling) over a signaling path through a signaling gateway to an SMS Center (SMSC). If a bearer path is established to the SMSC, the sender s phone transmits the text message to the SMSC over the bearer path. The SMSC can later forward the text message to the destination phone. Unfortunately, if the SMS message comprises spam, there is currently no effective way to block the spam. If the SMS message comprises spam and the SMS message reaches the SMSC, the SMSC will currently transmit the SMS message to the destination phone without checking to see if the SMS message comprises spam. [0006] The user of the destination phone may become dissatisfied with his/her service provider if the user receives too much spam. Thus, it is a problem that facilities do not exist that effectively block spam SMS messages (and other text or multi-media messages that comprise spam) destined for a cell phone or similar mobile communication device. One system for blocking spam is described in WO 04/ (the Application). The Application describes a system that analyzes messages based on the identity of the sender of the message and analyzes the messages based on the category of the message. The system then blocks the message if the sender or the category type falls within a blacklist. The Application describes one possible method of filtering messages, but does not provide the advantages described herein for the invention. Summary of the Solution [0007] The invention solves the above and other related problems by filtering spam destined for a mobile communication device. By filtering spam before it reaches a mobile communication device, the user of the mobile communication device will not have to read and/or delete the unwanted messages. Service providers implementing the spam filter can advantageously avoid their customers becoming dissatisfied by too much spam. One embodiment of the invention comprises a spam filtering system. The spam filtering system may be located in a Short Message Service Center (SMSC), a Signaling Transfer Point (STP), an SS7 gateway, an SMPP gateway, or other locations in a wireless network. The spam filtering system includes an interface and a processing system. In operation, the processing system receives a message destined for a mobile communication device through the interface. The processing system processes the message based on first filtering criteria to make an initial determination whether the message is suspected of comprising spam. If the processing system determines that the message is not suspected of comprising spam, then the processing system transmits the message to a message center or another system configured to forward the message to the destination mobile communication device. If the processing system determines that the message is suspected of comprising spam, then the processing system processes the message based on second filtering criteria to make a final determination whether the message comprises spam. [0008] If the processing system determines in the final 2

3 3 EP B1 4 determination that the message does not comprise spam, then the processing system transmits the message to the message center. If the processing system determines that the message does comprise spam, then the processing system blocks the message. [0009] To improve the performance of the spam filtering system in some embodiments, the processing system stores messages identified to be spam in a data table. The processing system then analyzes the content of the spam messages stored in the data table to identify new spam patterns or other indicators of spam. The processing system may seek the advice of human operators in identifying the new spam patterns. The processing system then updates the first filtering criteria and/or the second filtering criteria using the new spam patterns to improve spam filtering. [00] The invention may include other exemplary embodiments described below. [0011] An aspect of the invention is a spam filtering system comprising: an interface adapted to receive a message destined for a mobile communication device; a processing system adapted to receive the received message from the interface; the processing system is adapted to process the received message based on first filtering criteria to make an initial determination whether the received message is suspected of comprising spam, characterized in that the processing system is further adapted to transmit the received message based on said first filtering criteria without further processing to a message center responsive to an initial determination that the received message is not suspected of comprising spam, the processing system is further adapted to process the received message based on second filtering criteria responsive to an initial determination determining that the received message is suspected of comprising spam and to make a final determination whether the received message comprises spam, the processing system is further adapted to transmit the received message based on said second criteria to the message center responsive to a final determination determining that the received message does not comprise spam, and is further adapted to block the received message responsive to the final determination that the received message comprises spam. [0012] Preferably said received message based on said first criteria is transmitted to said message center over a path separate from a path over which said received message based on said second criteria is sent to said message center. [0013] Another aspect comprises a method of filtering spam in a wireless network responsive to the receipt of a message destined for a mobile communication device; said method comprises the steps of: processing the received message based on first filtering criteria to make an initial determination whether the received message is suspected of comprising spam; characterised in that said method comprises the further steps of transmitting the received message to a message center without further processing responsive to an initial determination that the received message is not suspected of comprising spam; processing the received message based on second filtering criteria responsive to an initial determination determining that the received message is suspected of comprising spam; making a final determination whether the received message comprises spam; transmitting the received message to the message center responsive to a final determination determining that the received message does not comprise spam; and blocking the received message responsive to a final determination that the received message comprises spam. [0014] Preferably the method of filtering spam comprises the further steps of transmitting said received message based on said first criteria to said message center over a path separable from a path over which said received message based on said second filter criteria is sent to said message center. Description of the Drawings [001] The same reference number represents the same element on all drawings. FIG. 1 illustrates a communication environment in an exemplary embodiment of the invention FIG. 2 is a flow chart illustrating a method of filtering spam in a wireless network in an exemplary embodiment of the invention. FIG. 3 is a flow chart illustrating additional steps to the method in FIG, 2 in an exemplary embodiment of the invention. FIG. 4 is a communication environment in another exemplary embodiment of the invention. Detailed Description of the Invention [0016] FIGS. 1-4 and the following description depict specific exemplary embodiments of the invention to teach those skilled in the art how to make and use the best mode of the invention. For the purpose of teaching inventive principles, some conventional aspects of the invention have been simplified or omitted. Those skilled in the art will appreciate variations from these embodiments that fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. As a result, the invention is not limited to the specific embodiments described below, but only by the claims and their equivalents. [0017] FIG. 1 illustrates a communication environment 0 in an exemplary embodiment of the invention. Communication environment 0 includes a wireless network 2 and a mobile communication device 4. Wireless network 2 comprises any network that communicates with end users via wireless signals, such as networks provided by Verizon, Sprint, Cingular, etc. Mobile communication device 4 comprises any device, phone, 3

4 EP B PDA, etc, that is portable or otherwise mobile and transmits and receives messages via wireless signals. A message comprises any information unit transmitted or received by a cell phone, PDA, or similar device via wireless signals. A message in this embodiment includes a text message, such as an SMS message, and a multi-media message, such as a digital picture from a camera phone. A message in this embodiment is not intended to include HTTP-type messages. Communication environment 0 may include other networks, systems, or devices not shown for the sake of brevity. [0018] Wireless network 2 includes a spam filtering system 1 and a message center 111. Spam filtering system 1 includes an interface 112 and a processing system 114. An interface comprises any systems, devices, or components that receive and transmit messages. A processing system comprises any computer microprocessor, logic circuit, or other processing device that executes instructions. Spam filtering system 1 may be positioned in multiple desired locations in wireless network 2. For instance, spam filtering system 1 may be located in message center 111, a Signaling Transfer Point (STP) (not shown), an SS7 gateway (not shown), an SMPP gateway (not shown), or other locations in wireless network 2. Spam filtering system 1 may include other systems, devices, or components not shown for the sake of brevity. A message center comprises any system that receives a message and forwards the message to a destination mobile communication device. One example of a message center is an SMSC. [0019] FIG. 2 is a flow chart illustrating a method 0 of filtering spam in wireless network 2 in an exemplary embodiment of the invention. Method 0 is described as if performed by spam filtering system1 in FIG. 1. Processing system114 receives a message 6 destined for mobile communication device 4 in step 2 (see FIG. 2). Processing system 114 receives the message 6 through interface 112. Message 6 may be transmitted by a mobile phone, a PDA, or any other system configured to send a message 6. [00] In step 4, processing system 114 processes the message 6 based on first filtering criteria to make an initial determination whether the message 6 is suspected of comprising spam. Spam comprises any unsolicited messages or junk messages. Filtering criteria comprises any rules, algorithms, data, or information used to identify spam. In some embodiments, the initial determination is intended to be a cursory check of the message 6 to identify suspect messages (i.e., messages suspected to be spam). The initial determination is as close to real-time as possible. [0021] If processing system 114 determines that the message 6 is not suspected of comprising spam, then processing system 114 transmits the message to message center 111 in step 8. Processing system 114 may transmit the message 6 to message center 111 through interface 112. Message center 111 can then forward the message 6 to destination mobile communication device 4. [0022] If processing system 114 determines that the message 6 is suspected of comprising spam, then processing system 114 processes the message based on second filtering criteria to make a final determination whether the message comprises spam in step 2. In some embodiments, the final determination is intended to be a more thorough check of the message 6 to determine if the message 6 comprises spam. Time is not as much of an issue in the final determination. Processing system 114 may seek the assistance or query human operators to make the final determination. Method 0 may include further steps not shown in FIG. 2. [0023] FIG. 3 is a flow chart illustrating additional steps to method 0 in an exemplary embodiment of the invention. In one embodiment, if processing system 114 determines in the final determination in step 2 that the message 6 does not comprise spam, then processing system 114 transmits the message to message center 11 1 in step 4. Processing system 114 may transmit the message 6 to message center 111 through interface 112. Message center 111 can then forward the message 6 to destination mobile communication device 4. [0024] If processing system 114 determines that the message 6 does comprise spam, then processing system 114 blocks the message 6 in step 6. Processing system 1 14 stores the message 6 (and potentially previous and subsequent messages) in a data table (not shown) in step 8. Processing system 114 analyzes the content of message 6 and other messages stored in the data table in step 3 to identify new spam patterns or other indicators of spam. Processing system 114 then updates the first filtering criteria and/or the second filtering criteria in step 312. Processing system 114 continually tries to improve the first filtering criteria so that the initial determination will more accurately identify suspect spam messages. Processing system 114 also continually tries to improve the second filtering criteria so that the actual spam is distinguished from genuine messages. [002] FIG. 4 is a communication environment 0 in another exemplary embodiment of the invention. Communication environment 0 includes signaling gateway 2, spam filtering system 4, Short Message Service Center (SMSC) 6, and mobile communication device 412. Signaling gateway 2 may comprise an SS7 gateway, an Internet Protocol (IP) gateway, a C7 gateway, or any other signaling gateway. Spam filtering system 4 includes an interface 414 and a processing system 416. Processing system 416 is configured to execute front-end service package application (FE-SPA) 422 and back-end service package application (BE-SPA) 432. FE-SPA 422 when executed by processing system 416 is able to access filtering criteria 424 and data table 426. BE-SPA 432 when executed by processing system 416 is able to access filtering criteria 434 and data table 436. SMSC 6 comprises any facility that accepts, buffers, processes and distributes short messages (up to 128 4

5 7 EP B1 8 bytes). An SMSC is used in this embodiment, but a Multi- Media Service Center (MMSC) could be used in other embodiments that accepts, buffers, processes and distributes multi-media messages, such as digital pictures. [0026] Spam filtering system 4 is located between signaling gateway 2 and SMSC 6 in this embodiment. Spam filtering system 4 could be located in other desired locations. In other embodiments, spam filtering system 4 could be located in signaling gateway 2, in SMSC 6, in other systems, or may be a stand-alone system. Spam filtering system 4 is a network-based system. Spam filtering system 4 is intended to intercept spam in the wireless network before the spam reaches a communication device, such as a cell phone. Spam filtering system 4 advantageously does not need to be resident on the communication device, thus avoiding issues such as processor speed and memory size. This is opposed to many current spam filters that are resident on computers and protect individual computers from spam. [0027] When in operation, signaling gateway 2 receives an SMS message. In other embodiments, the message may comprise a Multi-Media Service (MMS) message. The SMS message includes signaling and a data stream. Based on the address for the destination mobile communication device 412 (e.g., a phone number for communication device 412), signaling gateway 2 attempts to transmit the SMS message to SMSC 6. Spam filtering system 4 intercepts the SMS message transmitted to SMSC 6. Signaling gateway 2 may not know the existence of spam filtering system 4, or may transmit the SMS message to spam filtering system 4. [0028] FE-SPA 422 receives the SMS message. FE- SPA 422 processes the SMS message to make an initial determination whether the SMS message is suspected of comprising spam. FE-SPA 422 accesses the filtering criteria 424 to process SMS message. The initial determination is a cursory check of the SMS message to identify suspect messages (i.e., messages suspected to be spam). The initial determination is performed as close to real-time as possible. [0029] The following describes some of the filtering criteria 424 used to make the initial determination. FE-SPA 422 may process the sending address (e.g., the sender s phone number) of the SMS message and determine if a large number of SMS messages originated from this sending address. FE-SPA 422 may process the receiving address to determine if the receiving address is adjacent to or is sequential to addresses of other SMS messages previously sent. FE-SPA 422 may track the number of SMS messages sent from the sending address to determine if the sending address exceeds a message counter threshold. FE-SPA 422 may determine if the sending address is on a white list (approved list), such as a legitimate bulk SMS sender, or determine if the sending address is on a black list (non-approved list), such as a sender identified to send spam. The white and black lists may be selected by network analysts and/or selected by the user for his/her preferences. FE-SPA 422 may process the data stream of the SMS message to identify certain data patterns determined to comprise spam. [00] If FE-SPA 422 does not suspect the SMS message to comprise spam based on the initial determination, then FE-SPA 422 forwards the SMS message to SMSC 6. SMSC 6 then forwards the SMS message to mobile communication device 412. Mobile communication device 412 may comprise a wireless phone, a PDA, a pager, or similar communication device. [0031] If FE-SPA 422 suspects that the SMS message comprises spam based on the initial determination, then FE-SPA 422 assigns a suspect level to the SMS message. The suspect level indicates how sure FE-SPA 422 is that the SMS message comprises spam. The suspect level may be based on the Bayesian metric. FE-SPA 422 then forwards the SMS message to BE-SPA 432 for a more thorough analysis. [0032] FE-SPA 422 uses data table 426 to track information on the SMS messages it processes. For instance, FE-SPA 422 may track the number of SMS messages sent by a particular sending address over a time period in data table 426. FE-SPA 422 may also track the number of SMS messages sent by a particular network over a time period in data table 426. [0033] BE-SPA 432 receives the suspect SMS message from FE-SPA 422. BE-SPA 432 processes the SMS message to make a final determination whether the SMS message comprises spam. BE-SPA 432 accesses the filtering criteria 434 to process the SMS message and make the final determination. Filtering criteria 434 may be the same as filtering criteria 424. However, filtering criteria 434 typically provides for a more in-depth examination of the SMS message than filtering criteria 424, so filtering criteria 434 may include more rules or content data patterns than filtering criteria 424. For instance, filtering criteria 424 may allow FE-SPA 422 to check signaling information for the SMS message and check small content segments of the data stream of the SMS message. On the other hand, filtering criteria 434 may allow BE-SPA 432 to thoroughly check the content of the data stream of the SMS message to look for content patterns identified to be spam. A thorough check of the data stream in FE-SPA 422 may be too time consuming. BE- SPA 432 can use virtually any filtering criteria 434 to examine the SMS message because time is not as much of an issue. [0034] If BE-SPA 432 determines that the SMS message does not comprise spam, then BE-SPA 432 forwards the SMS message to SMSC 6. SMSC 6 then forwards the SMS message to mobile communication device 412. [003] If BE-SPA 432 determines that the SMS message comprises spam, then BE-SPA 432 blocks the SMS message from reaching SMSC 6. BE-SPA 432 also stores the SMS message determined to be spam in data table 436 for further analysis. BE-SPA 432, possibly un-

6 9 EP B1 der the guidance of human operators, analyzes the spam SMS messages stored in data table 436 to identify new spam patterns. If a new spam pattern is found, then BE- SPA 432 updates filtering criteria 424 used by FE-SPA 422. BE-SPA 432 continually updates filtering criteria 424 to improve the performance of FE-SPA 422 in identifying suspect SMS messages. BE-SPA 432 also updates filtering criteria 434. The updating of filtering criteria 424 and filtering criteria 434 may be under the guidance of human operators to ensure quality. [0036] In summary, spam filtering system 4 advantageously does an initial spam determination so that legitimate SMS messages reach SMSC 6 in substantially real-time. Spam filtering system 4 then performs a more detailed analysis on suspect messages to effectively block spam SMS messages before the SMS messages reach SMSC 6. By blocking most or all of the spam SMS messages, mobile communication device 412 receives less spam. Claims 1. A spam filtering system (1,4) for a wireless network (0,0), the spam filtering system comprising: an interface (112,414) adapted to receive a message (6) destined for a mobile communication device (4,6); and a processing system (114,416) adapted to receive the message from the interface the processing system being further adapted to process the message based on first filtering criteria (424)to make an initial determination whether the message is suspected of comprising spam, the processing system being further adapted to transmit the message based on said first filtering criteria (424) to a message center (111,6) without further processing responsive to an initial determination that the message is not suspected of comprising spam, the message center being subsequently adapted to forward the message to the mobile communication device, the processing system (416) being further adapted to process the message based on second filtering criteria(434) responsive to an initial determination determining that the message is suspected of comprising spam to make a final determination whether the message comprises spam, and the processing system (114,416) is further adapted to transmit the message (6) based on said second criteria (434) to the message center (111,6) responsive to a final determination determining that the message docs not comprise spam, and is further adapted to block the message responsive to the final determination that the message comprises spam. 2. The spam filtering system of claim 1 wherein said message based on said first criteria is transmitted to said message center (6) over a path separate from a path over which said message based on said second criteria is sent to said message center. 3. The spam filtering system (1) of claim 2 wherein the processing system (114,416) is further adapted to store the message (6) in a data table (436) responsive to the final determination determining that the message comprises spam, is further adapted to analyze the message, and is further adapted to update at least one of the first filtering criteria (424) and the second filtering criteria (434) based on the analysis of the message. 4. The spam filtering system (1) of claim 1 wherein the frecived message (6) comprises at least one of a Short Message Service, SMS, message and a Multi-Media Services, MMS, message.. The spam filtering system (1) of claim 1 wherein the processing system (114)is further adapted to query human operators to make the final determination. 6. A method of filtering spam in a wireless network (0,0), the method, responsive to receiving a message (6) destined for a mobile communication device (4) comprises the step of; processing the message based on first filtering criteria (424) to make an initial determination whether the message is suspected of comprising spam; transmitting the message to a message center (111,6) without further processing responsive to an initial determination that the message is not suspected of comprising spam, the message center forwarding the message to the mobile communication device subsequently; processing the message based on second filtering criteria (434)responsive to an initial determination determining that the message is suspected of comprising spam to make a final determination whether the message comprises spam, transmitting the message (6) to the message center (111,6) responsive to a final determination determining that the message does not comprise spam; and blocking the message responsive to a final determination that the message comprises spam. 7. The method of filtering spam of claim 6 comprising the further steps of: 6

7 11 EP B1 12 transmitting said message based on said first criteria to said message center over a path separate from a path over which said message based on said second filter criteria is sent to said message center. 8. The method of claim 7 further comprising the steps of: storing the message (6) in a data tablc(436) responsive to the final determination determining that the message comprises spam, analyzing the message, and updating at least one of the first filtering criteria (424) and the second filtering criteria (434) based on the analysis of the message. 9. The method of claim 6 wherein: the message (6) comprises at least one of a Short Message Service, SMS, message and a Multi-Media Services, MMS, message. 1 wobei das Verarbeitungssystem ferner dafür ausgelegt ist, die Nachricht auf der Basis von ersten Filterungskriterien (424) zu verarbeiten, um eine anfängliche Bestimmung durchzuführen, ob von der Nachricht verdächtigt wird, daß sie Spam umfaßt, wobei das Verarbeitungssystem ferner dafür ausgelegt ist, die Nachricht auf der Basis der ersten Filterungskriterien (424) als Reaktion auf eine anfängliche Bestimmung, daß von der Nachricht nicht verdächtigt wird, daß sie Spam umfaßt, ohne weitere Verarbeitung zu einer Nachrichtenzentrale (111, 6) zu senden, wobei die Nachrichtenzentrale danach dafür ausgelegt ist, die Nachricht zu dem Mobilkommunikationsgerät weiterzuleiten, wobei das Verarbeitungssystem (416) ferner dafür ausgelegt ist, als Reaktion auf eine anfängliche Bestimmung, daß von der Nachricht verdächtigt wird, daß sie Spam umfaßt, die Nachricht auf der Basis von zweiten Filterungskriterien (434) zu filtern, um eine letztendliche Bestimmung zu treffen, ob die Nachricht Spam umfaßt, und wobei das Verarbeitungssystem (114, 416) ferner dafür ausgelegt ist, auf der Basis der zweiten Filterungskriterien (434) die Nachricht (6) als Reaktion darauf, daß eine letztendliche Bestimmung bestimmt, daß die Nachricht kein Spam umfaßt, zu der Nachrichtenzentrale (111, 6) zu senden, und ferner dafür ausgelegt ist, die Nachricht als Reaktion auf die letztendliche Bestimmung, daß die Nachricht Spam umfaßt, zu blockieren. 2. Spam-Filterungssystem nach Anspruch 1, wobei die Nachricht auf der Basis der ersten Kriterien über einen Pfad zu der Nachrichtenzentrale (6) gesendet wird, der von einem Pfad, über den die Nachricht auf der Basis der zweiten Kriterien zu der Nachrichtenzentrale gesendet wird, getrennt ist.. The method of claim 6 further comprising the step of: querying human operators to make the final determination Patentansprüche 1. Spam-Filterungssystem (1, 4) für ein drahtloses Netzwerk (0, 0), wobei das Spam-Filterungssystem folgendes umfaßt: 2 3. Spam-Filterungssystem (1) nach Anspruch 2, wobei das Verarbeitungssystem (114, 416) ferner dafür ausgelegt ist, die Nachricht (6) als Reaktion darauf, daß die letztendliche Bestimmung bestimmt, daß die Nachricht Spam umfaßt, in einer Datentabelle (436) zu speichern, ferner dafür ausgelegt ist, die Nachricht zu analysieren und ferner dafür ausgelegt ist, mindestens eines der ersten Filterungskriterien (424) und der zweiten Filterungskriterien (434) auf der Basis der Analyse der Nachricht zu aktualisieren. eine Schnittstelle (112, 414), die dafür ausgelegt ist, eine für ein Mobilkommunikationsgerät (4, 6) bestimmte Nachricht (6) zu empfangen; und ein Verarbeitungssystem (114, 416), das dafür ausgelegt ist, die Nachricht von der Schnittstelle zu empfangen; Spam-Filterungssystem (1) nach Anspruch 1, wobei die empfangene Nachricht (6) eine Nachricht des Short Message Service SMS und/oder eine Nachricht der Multi-Media Services MMS ist.. Spam-Filterungssystem (1) nach Anspruch 1, wobei das Verarbeitungssystem (114) ferner dafür ausgelegt ist, Bedienungspersonen zu befragen, um die letztendliche Bestimmung durchzuführen. 6. Verfahren zum Filtern von Spam in einem drahtlosen Netzwerk (0, 0), wobei das Verfahren, das auf den Empfang einer für ein Mobilkommunikationsgerät (4) bestimmten Nachricht (6) reagiert, den folgenden Schritt umfaßt: Verarbeiten der Nachricht auf der Basis von ersten Filterungskriterien (424), um eine anfängliche Bestimmung durchzuführen, ob von der Nachricht verdächtigt wird, daß sie Spam umfaßt; als Reaktion auf eine anfängliche Bestimmung, daß von der Nachricht nicht verdächtigt wird, daß sie Spam umfaßt, Senden der Nachricht zu 7

8 13 EP B1 14 einer Nachrichtenzentrale (111, 6) ohne weitere Verarbeitung, wobei die Nachrichtenzentrale danach die Nachricht zu dem Mobilkommunikationsgerät weiterleitet; als Reaktion auf eine anfängliche Bestimmung, die bestimmt, daß von der Nachricht verdächtigt wird, daß sie Spam umfaßt, Verarbeiten der Nachricht auf der Basis von zweiten Filterungskriterien (434), um eine letztendliche Bestimmung zu treffen, ob die Nachricht Spam umfaßt, als Reaktion auf eine letztendliche Bestimmung, die bestimmt, daß die Nachricht kein Spam umfaßt, Senden der Nachricht (6) zu der Nachrichtenzentrale (111, 6); und als Reaktion auf eine letztendliche Bestimmung, daß die Nachricht Spam umfaßt, Blockieren der Nachricht. 7. Verfahren zum Filtern von Spam nach Anspruch 6, ferner mit den folgenden Schritten: Senden der Nachricht auf der Basis der ersten Kriterien über einen Pfad, der von einem Pfad, über den die Nachricht auf der Basis der zweiten Filterkriterien zu der Nachrichtenzentrale gesendet wird, getrennt ist, zu der Nachrichtenzentrale. 8. Verfahren nach Anspruch 7, ferner mit den folgenden Schritten: als Reaktion darauf, daß die letztendliche Bestimmung bestimmt, daß die Nachricht Spam umfaßt, Speichern der Nachricht (6) in einer Datentabelle (436), Analysieren der Nachricht und Aktualisieren mindestens eines der ersten Filterungskriterien (424) und der zweiten Filterungskriterien (434) auf der Basis der Analyse der Nachricht. 9. Verfahren nach Anspruch 6, wobei die Nachricht (6) eine Nachricht des Short Message Service SMS und/oder eine Nachricht der Multi-Media Services MMS umfaßt.. Verfahren nach Anspruch 6, ferner mit dem folgenden Schritt: Befragen von Bedienungspersonen, um die letztendliche Bestimmung durchzuführen. Revendications 1. Système de filtrage de pourriels (1, 4) pour un réseau sans fil (0, 0), le système de filtrage de pourriels comprenant : une interface (112, 414) apte à recevoir un message (6) destiné à un dispositif de communication mobile (4, 6) ; et un système de traitement (114, 416) apte à recevoir le message provenant de l interface ; le système de traitement étant en outre apte à traiter le message sur la base d un premier critère de filtrage (424) pour faire une détermination initiale si le message est suspecté de comprendre un pourriel, le système de traitement étant en outre apte à transmettre le message sur la base dudit premier critère de filtrage (424) à un centre de messages (111, 6) sans traitement supplémentaire en réponse à une détermination initiale que le message n est pas suspecté de comprendre un pourriel, le centre de messages étant ultérieurement apte à transférer le message au dispositif de communication mobile, le système de traitement (416) étant en outre apte à traiter le message sur la base d un second critère de filtrage (434) en réponse à une détermination initiale déterminant que le message est suspecté de comprendre un pourriel pour faire une détermination finale si le message comprend un pourriel, et le système de traitement (114, 416) est en outre apte à transmettre le message (6) sur la base dudit second critère (434) au centre de messages (111, 6) en réponse à une détermination finale déterminant que le message ne comprend pas de pourriel, et est en outre apte à bloquer le message en réponse à la détermination finale que le message comprend un pourriel. 2. Système de filtrage de pourriels selon la revendication 1 dans lequel ledit message sur la base dudit premier critère est transmis audit centre de messages (6) sur un chemin séparé d un chemin sur lequel ledit message sur la base dudit second critère est envoyé audit centre de messages. 3. Système de filtrage de pourriels (1) selon la revendication 2 dans lequel le système de traitement (114, 416) est en outre apte à stocker le message (6) dans une table de données (436) en réponse à la détermination finale déterminant que le message comprend un pourriel, est en outre apte à analyser le message et est en outre apte à mettre à jour au moins un du premier critère de filtrage (424) et du second critère de filtrage (434) sur la base de l analyse du message. 4. Système de filtrage de pourriels (1) selon la revendication 1 dans lequel le message reçu (6) comprend au moins un d un message de service de messages courts, SMS et d un message de services multimédia, MMS. 8

9 1 EP B1 16. Système de filtrage de pourriels (1) selon la revendication 1 dans lequel le système de traitement (114) est en outre apte à interroger des opérateurs humains pour faire la détermination finale. 6. Procédé de filtrage de pourriels dans un réseau sans fil (0, 0), le procédé, en réponse à la réception d un message (6) destiné à un dispositif de communication mobile (4) comprend les étapes de : traitement du message sur la base du premier critère de filtrage (424) pour faire une détermination initiale si le message est suspecté de comprendre un pourriel ; transmission du message à un centre de messages (111, 6) sans traitement supplémentaire en réponse à une détermination initiale que le message n est pas suspecté de comprendre un pourriel, le centre de messages transférant le message au dispositif de communication mobile ultérieurement ; traitement du message sur la base du second critère de filtrage (434) en réponse à une détermination initiale déterminant que le message est suspecté de comprendre un pourriel pour faire une détermination finale si le message comprend un pourriel, transmission du message (6) au centre de messages (111, 6) en réponse à une détermination finale déterminant que le message ne comprend pas de pourriel ; et blocage du message en réponse à une détermination finale que le message comprend un pourriel. 7. Procédé de filtrage de pourriels selon la revendication 6 comprenant l étape supplémentaire de : Procédé selon la revendication 6 dans lequel : le message (6) comprend au moins un d un message de service de messages courts, SMS et d un message de services multimédia, MMS.. Procédé selon la revendication 6 comprenant en autre l étape d : interrogation d opérateurs humains pour faire la détermination finale. transmission dudit message sur la base dudit premier critère audit centre de messages sur un chemin séparé d un chemin sur lequel ledit message sur la base dudit second critère de filtre est envoyé audit centre de messages. 8. Procédé selon la revendication 7 comprenant en outre les étapes de : 4 stockage du message (6) dans une table de données (436) en réponse à la détermination finale déterminant que le message comprend un pourriel, analyse du message, et mise à jour d au moins un du premier critère de filtrage (424) et du second critère de filtrage (434) sur la base de l analyse du message. 0 9

10 EP B1

11 EP B1 11

12 EP B1 12

13 EP B1 13

14 EP B1 REFERENCES CITED IN THE DESCRIPTION This list of references cited by the applicant is for the reader s convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard. Patent documents cited in the description WO A [0006] 14

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