WO2008067744A1 - Procédé, système et serveur de filtrage pour filtrer le contenu de communication d'un utilisateur itinérant - Google Patents

Procédé, système et serveur de filtrage pour filtrer le contenu de communication d'un utilisateur itinérant Download PDF

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Publication number
WO2008067744A1
WO2008067744A1 PCT/CN2007/071105 CN2007071105W WO2008067744A1 WO 2008067744 A1 WO2008067744 A1 WO 2008067744A1 CN 2007071105 W CN2007071105 W CN 2007071105W WO 2008067744 A1 WO2008067744 A1 WO 2008067744A1
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WO
WIPO (PCT)
Prior art keywords
rule
filtering
content
network
user
Prior art date
Application number
PCT/CN2007/071105
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English (en)
French (fr)
Inventor
Yiling Liu
Chong Gu
Jin Peng
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to KR1020097013937A priority Critical patent/KR101141121B1/ko
Priority to ES07817295.4T priority patent/ES2488091T3/es
Priority to EP07817295.4A priority patent/EP2086180B1/en
Priority to JP2009539591A priority patent/JP5044660B2/ja
Publication of WO2008067744A1 publication Critical patent/WO2008067744A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

Definitions

  • the present invention relates to content filtering technologies in the field of communications, and in particular, to a method, system, visited network content filtering server, home visited network content filtering server, and content filtering server for filtering communication content of roaming users.
  • content filtering technologies in communication networks generally include list filtering technology, keyword filtering technology, image filtering technology, template filtering technology, and classification filtering technology.
  • the purpose of content filtering in a communication network is to keep communication users away from maliciousness. The content or unwillingness to receive content, guarantee the civilized interaction of the communication network.
  • FIG. 1 is a schematic diagram of a system structure in which a home network and a visited network respectively have a content filtering mechanism, where the home network 10 and the visited network 20 are both wireless communication networks, including wireless connections.
  • Network access and core network may include service control networks, such as: IP Multimedia Subsystem (IMS), may also include service networks, etc.).
  • the home network 10 and the visited network 20 can interact through the core network.
  • the content source 30 refers to a content provider, which may be an external entity independent of the wireless communication network (such as an Internet content server), or may be an internal entity of the wireless communication network (such as a short message center;), where the content source 30 is independent of A wireless communication network is described as an example.
  • the home network content filtering server 40 and the visited network content filtering server 50 respectively provide content filtering services for the home network 10 and the visited network 20, which may be separate entities that are responsible for the content filtering provider, or may be owned by the wireless communication network operator.
  • responsible entity for convenience of description, the home network and the visited network content filtering server are respectively described separately from the wireless communication network, and the home network content filtering server 40 and the visited network content filtering server 50 can respectively interact with the content source 30, and They can also interact with each other.
  • the home network public policy manager 60 is responsible for managing the public filtering rules in the home network 10, that is, the home network content filtering server 40 filters all content based on the rules set by the home network public policy manager 60, while the content filtering subscriber 80 Set for related users or related user groups
  • the home network content filtering server 40 filters the content of the related user or the related user group based on the rules set by the home network public rule manager 60, and also filters the content set by the subscriber 80 based on the content.
  • Filter rules filter content.
  • the same-like visited network public rules manager 70 is responsible for managing the public filtering rules in the visited network 20, that is, the visiting web content filtering server 50 filters all the content based on the rules set by the visited network public rules manager 70.
  • the filtering rules to be followed by the content related to the user 10 include the rules managed by the home network public rule manager 60 and the filtering rules set by the content filtering subscriber 80; when the user 90 roams When visiting the network 20, the content associated with the user 10 is subject to the rules managed by the visited network public rules manager 70 in addition to the filtering rules described above in the home network.
  • FIG. 2 is a schematic diagram of a content filtering process based on the system structure of FIG. 1 , where a content source sends related content to a roaming user in a visited network, and the content filtering process is as follows:
  • the content source (CR, Content Resource) sends the content and the recipient user identifier to the user's home network (HN, Home Network);
  • the HN sends the content and the receiver user identifier to the home network content filtering server (HCS) to request content filtering. If the HCS cannot identify the receiver user identifier brought by the CR, the HN needs to be based on the CR band.
  • the incoming recipient user identifier finds the corresponding HCS identifiable user identifier and sends it to the HCS;
  • the HCS matches all the filtering rules that the content should follow in the HN according to the receiver user ID.
  • the HCS sends the filtering result and the recipient user ID to the HN;
  • the HN sends the filtering result and the recipient user ID to the visited network (VN, Visited Network);
  • the VN sends the received filtering result and the recipient user ID to the visited content filtering server (VCS, Visited Content Screening Server), and requests the content filtering. If the VCS cannot identify the recipient user identifier brought by the HN, the VN The user identifier of the corresponding VCS is found and sent to the VCS according to the receiver user identifier brought by the HN. 57. VCS filters the received content according to the public filtering rules of the visited network;
  • the VCS sends the filtering result and the recipient user ID to the VN;
  • the VN determines the sending address according to the recipient user ID, and encapsulates the filtering result into a packet format that meets the requirements, and then sends it to the roaming user.
  • the sent content is first filtered by the home network content filtering server, and then filtered by the visited network content filtering server, and vice versa.
  • the sent content is first filtered by the visited network content filtering server, and then filtered by the home network content filtering server, so that the network processing resource is relatively expensive.
  • the problem that the filtering time is relatively long, and the possibility of affecting the filtering process due to a single point of failure is also large, so that the use feeling of the receiving and receiving content when the user is in the roaming state has a great influence.
  • the embodiment of the invention provides a method for filtering the communication content of the roaming user and a system thereof, which solves the problem of wasting network resources and processing time when filtering the content sent and received by the roaming user in the visited network.
  • the embodiment of the present invention further provides a visited network content filtering server, a home network content filtering server, and a content filtering server.
  • an embodiment of the present invention provides a method for filtering communication content of a roaming user, including the following steps:
  • the second network where the roaming user is located obtains a rule for filtering the content sent and received by the first network where the roaming user is located;
  • Filtering content sent and received by the roaming user according to the filtering rule
  • the embodiment of the present invention further provides a content filtering server, including:
  • a rule obtaining unit configured to acquire, in the second network, a rule for filtering, by the first network where the roaming user is located, the content of the user to be sent;
  • an embodiment of the present invention provides a system for filtering a communication content of a roaming user, including: a visited network content filtering server, configured to acquire a rule for filtering, by the roaming user home network, the content sent and received by the user, and based on the obtained The filtering rule has been performed on the content sent and received by the roaming user.
  • the home network content filtering server is configured to send, according to the obtaining request sent by the visited network content filtering server, a rule for filtering the content sent and received by the user to the visited network content filtering server.
  • the embodiment of the present invention further provides a visited network content filtering server, including: an obtaining unit, configured to acquire a rule for filtering a content of the user to send and receive content to the home network of the roaming user; and a rule database, configured to store the acquiring unit The obtained filtering rule is used by the filtering unit to filter the content sent and received by the roaming user based on the filtering rule stored in the rule database.
  • a visited network content filtering server including: an obtaining unit, configured to acquire a rule for filtering a content of the user to send and receive content to the home network of the roaming user; and a rule database, configured to store the acquiring unit The obtained filtering rule is used by the filtering unit to filter the content sent and received by the roaming user based on the filtering rule stored in the rule database.
  • the embodiment of the present invention further provides a home network content filtering server, including: a request receiving unit, configured to receive an acquisition request sent by a visited network content filtering server in a visited network where the roaming user is located, where the obtaining request is used to request the A rule for the user to send and receive content for filtering; a filtering rule feedback unit, configured to query a rule for filtering the content sent and received by the user according to the obtaining request received by the request receiving unit, and feed back to the visited network content filtering server.
  • a request receiving unit configured to receive an acquisition request sent by a visited network content filtering server in a visited network where the roaming user is located, where the obtaining request is used to request the A rule for the user to send and receive content for filtering
  • a filtering rule feedback unit configured to query a rule for filtering the content sent and received by the user according to the obtaining request received by the request receiving unit, and feed back to the visited network content filtering server.
  • the technical solution of the invention can prevent the content of the sending and receiving of the roaming user from performing content filtering processing at the home location and the visited place respectively, reducing the delay of the content filtering processing, saving network processing resources, and reducing the filtering caused by a single point of failure.
  • the possibility of processing enables the roaming user to perform the content transceiving processing relatively quickly at the visited place, thereby improving the user's use experience.
  • FIG. 1 is a schematic structural diagram of a system in which a user has a content filtering mechanism in a home network and a visited network in a roaming state;
  • FIG. 2 is a schematic diagram of a content filtering process based on the system structure of FIG. 1 , in which a content source sends related content to a roaming user in a visited network;
  • FIG. 3 is a schematic diagram of a processing procedure of a first embodiment of acquiring a filtering rule according to the present invention
  • FIG. 4 is a schematic diagram of a processing procedure of a second embodiment for acquiring a filtering rule and performing content filtering according to the present invention
  • FIG. 5 is a schematic diagram of control flow of two roaming modes of an IMS according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of filtering the data entering and leaving the GGSN by using the IP-CAN roaming in FIG. 5 according to the IP-CAN roaming in FIG. 5, and the IMS triggering service layer application server HCS to filter the data.
  • FIG. 7 is an embodiment of the present invention. Based on the processing flow of FIG. 3 or FIG. 4 above, the roaming user HN The filtering rule is obtained by storing an example of processing on the basis of the VN, and subsequently filtering the content sent by the roaming user;
  • FIG. 8 is a schematic diagram of an embodiment of processing, according to the process flow of FIG. 6, the filtering rule in the roaming user VN is stored on the HN, and the content sent by the roaming user is filtered.
  • FIG. 9 is a flowchart of processing a method for acquiring a filter rule in a roaming user HN based on the process flow of FIG. 3 or FIG. 4, and subsequently updating the acquired filter rule;
  • FIG. A schematic diagram of a processing procedure of a third embodiment for filtering rules and performing content filtering;
  • FIG. 11 is a schematic diagram of an embodiment of processing the filtering rules of the roaming user HN based on the processing flow of the foregoing method, and storing the content sent to the roaming user;
  • FIG. 12 is a schematic diagram of processing of a first embodiment of a filtering rule obtained by a VCS deletion
  • FIG. 13 is a schematic diagram of processing of a second embodiment of a filtering rule obtained by a VCS deletion
  • FIG. 14 is a schematic diagram of an interface of a content filtering technology applied to a WCDMA R99 system. ;
  • FIG. 15 is a schematic diagram of an interface filtering technology applied to an interface based on an IMS network architecture according to an embodiment of the present invention
  • 16 is a schematic diagram of a content filtering technology applied to a WCDMA R99 system
  • Fig. 17 is a view showing a system configuration diagram for constructing the above-described embodiment of the present invention and a processing structure diagram inside the VCS and HCS.
  • the content processing mode of the roaming user there are mainly two processing modes for the content processing mode of the roaming user: First, the content received by the roaming user is processed by the home network and the visited network, and the content sent by the roaming user passes through The processing of the visited network and the home network; Second, the content sent and received by the roaming user is only processed in the visited network.
  • the prior art only uses the content received by the roaming user in the first mode, and has the problem of wasting network resources and processing delays. Meanwhile, the second mode does not propose how to solve the problem of roaming user sending and receiving content filtering. Program.
  • not only the rule for filtering the content of the user to send and receive the content in the home network of the roaming user can be synchronously acquired to the visited network where the roaming user is located, so that the content sent and received by the roaming user is obtained.
  • the filtering process can be directly performed on the roaming network, thereby avoiding the problem of wasting network resources and processing delay in the above roaming mode, and can be applied to the roaming mode 2 described above.
  • the roaming user can also obtain the home network where the roaming user is located in the network, so that the content sent and received by the roaming user can be directly filtered on the home network, thereby avoiding the roaming.
  • the model wastes network resources and has a long processing delay, which is in line with the IMS home domain control idea.
  • the solution for implementing the foregoing process includes the following steps:
  • the second network where the roaming user is located acquires a rule for filtering the content sent and received by the user in the first network where the roaming user is located; and the content sent and received by the roaming user is filtered according to the filtering rule.
  • the second network is a visited network
  • the first network is a home network
  • the second network is a home network
  • the first network is a visited network.
  • the following uses the first network as the home network, and the second network as the visited network as an example.
  • the filtering rule obtained by the roaming user from the visited network to the home network of the roaming user is a rule for the home network to filter all the received and sent content (defined herein as a public rule). If the roaming user is located in the home network, there is a corresponding content filtering subscriber. If other filtering rules are set for the user, the filtering rule obtained by the visiting network also includes a filtering rule set by the content filtering subscriber for the user (defined herein as a private rule). If the visited network where the roaming user is located and the home network reach the same common rule, the filtering rule obtained by the visited network from the home network only contains the corresponding private rule.
  • the first time to obtain the filtering rule from the user's home network (HN) includes but is not limited to the following two situations:
  • the VN finds that the signaling interaction represents that the user roams into the network, and triggers the action of obtaining the filtering rule in the HN;
  • the VN When the VN first receives the content sent to the roaming user or the content sent by the roaming user, the related content is sent to the visited network content filtering server (VCS) to request content filtering, and the VCS queries the user as a roaming user and does not acquire When the user belongs to the filtering rule of the network, the action of obtaining the filtering rule into the HN is triggered.
  • VCS visited network content filtering server
  • the home network content filtering server HCS and the home network HN are separately described as two processing entities, but this is only for convenience of description, and the HCS is still a network element device in the HN; Separate the VCS from the visited network VN as two processing entities Description, its VCS is still a network element device in the VN.
  • FIG. 3 it is a schematic diagram of a processing procedure of a first embodiment for obtaining a filtering rule according to the present invention, wherein the processing procedure is as follows:
  • the VN processes a user's power-on registration, dormant handover registration, voice/data service handover (such as MSC handover, PDSN handover, SGSN handover, etc.), the VN parses the user's HN. The address is used to determine that the user is a roaming user, and according to the operation, it can be determined that the roaming user performs signaling interaction with the network for the first time in the roaming state.
  • voice/data service handover such as MSC handover, PDSN handover, SGSN handover, etc.
  • the VN notifies the VCS to obtain the filtering rule that the user has in the home network.
  • the notification message sent by the VN carries the identifier of the user and the address of the HN.
  • the VCS queries the user roaming status record table according to the user identifier carried in the notification message sent by the VN. If the user record is not queried, the VCS needs to obtain the filtering rule of the user in the HN of the user. If the user record is queried, it indicates that the filtering rule possessed by the user has been obtained in the HN of the user, and this case is terminated after the execution of S13.
  • the VCS returns a response to the VN, and notifies the VN that the notification message in the above S11 has been received. If the VN does not receive the response, the VN should resend the notification message in the above S11 after a certain time interval, if the notification is repeated for the specified number of times. After the message has not received the response, you can choose to terminate the processing.
  • the VCS requests a content filtering rule from the HN of the user according to the HN address carried in the notification message sent by the VN, where the request message carries the user identifier and the VCS address.
  • the HN parses the request message sent by the VCS, and finds that it is a content filtering rule request message, and queries whether the user record is recorded in the user record table according to the user identifier carried in the request message, and if there is no record, add The user's record; and then the HN forwards the received request message to the home network content filtering server (HCS).
  • HCS home network content filtering server
  • the user ID carried in the received request message is queried by the user ID: if the roaming status record of the user is not queried, the roaming status record of the user is added, and the roaming identifier is set to roam And save the VCS address carried in the received request message; if the HCS queries the roaming identifier in the roaming status record of the user as roaming, but corresponds to the saved VCS address and the VCS address carried in the received request message.
  • the difference is that the user has roamed from the VN corresponding to the originally saved VCS address to the VN corresponding to the currently received VCS address, and the HCS replaces the previously saved VCS address with the received VCS address;
  • the roaming identifier in the roaming status record of the user is not roaming, indicating that the user directly roams from the HN to the VN, and then sets the roaming identity to roam out, and saves the received VCS address.
  • the HCS also queries if the user is set to have a private filter rule. If the user is set to a private rule, the private rule corresponding to the user is also found. The private filtering rule of the roaming user is also queried, and the queried private rule is also fed back to the VCS, and the user identifier and the HCS address are also carried in the feedback message.
  • the request message in the above S14 should be resent after a certain time interval. If the VCS resends the request message for the specified number of times, it still has not received the feedback message sent by the HCS. You can choose to terminate the program.
  • the VCS processes the received filtering rule according to the requirement and saves the user identifier and the filtering rule in the rule database.
  • the VCS adds a user record in the user roaming state record table, and stores the HCS address corresponding to the user identifier, and The user's roaming identity is set to roam.
  • VCS and HCS use the same syntax to describe the filtering rules, there is no need to identify and convert the syntax. If VCS and HCS use different syntax to describe the filtering rules, then the syntax of the received filtering rules should be executed.
  • Identification and conversion processing to allow VCS and HCS to understand each other's grammar rules secondly, in terms of semantics, for keyword words to be used directly, if VCS and HCS use the same classification and classification method, then no filtering rules are required. The semantic recognition and conversion are performed, and if VCS and HCS use different classification and classification methods, it is necessary to perform semantic recognition and conversion processing on the received filtering rules.
  • the obtained filtering rule or the converted filtering rule may be executed, or the obtained filtering rule may be executed after the obtained filtering rule is executed, and the public filtering rule of the VCS and the acquired HCS may also be obtained.
  • the filtering rule or the converted HCS filtering rule is combined, and the content sent and received by the roaming user is filtered according to the combined filtering rule.
  • FIG. 4 it is a schematic diagram of a processing procedure of a second embodiment for obtaining a filtering rule and performing content filtering according to the present invention, wherein the processing procedure is as follows: 520.
  • the roaming out user record table is queried according to the user identifier. If the user record is not found, the received content and the user identifier are sent to the VCS, and the VCS is requested to perform content filtering.
  • the VCS queries the user roaming status record table according to the received user ID. If the user record is not queried, it is determined that the VN needs to be obtained by the VN.
  • the VCS requests the HN address of the user from the VN, where the request message carries the user identifier.
  • the VN queries its HN address according to the user identifier, and returns the HN address of the query to the VCS.
  • the VCS After receiving the HN address of the user fed back by the VN, the VCS determines that the user is a roaming user, and needs to obtain a content filtering rule from the HN of the user.
  • the user record is added to the user roaming status record table, and the roaming identifier is not roamed.
  • the process is terminated and the VCS public rule is directly used and the possible private rules are matched to filter and return the result.
  • the processing of the subsequent S25 to S29 is the same as or similar to the processing of S14 to S18 in the processing of the foregoing FIG. 3, and details are described above, and details are not described herein again.
  • the VCS matches all the filtering rules that the user should follow in the roaming state in the rule database according to the user identifier (including the filtering rules that the user should follow in the HN to send and receive content, and further if the VCS has to filter all the sent and received content.
  • the rule further includes the rule that the VCS filters all the sent and received content, and filters the first sending and receiving content of the roaming user by using the matched filtering rule; on the other hand, the VCS records the current time point of performing the content filtering process. Take as the most recent execution time.
  • the VCS sends the filtered content and the user identifier to the VN (wherein the VCS can directly feed the filtered content to the device that sends the content, or can feed back to other devices in the VN that have the content sending capability).
  • IMS has been defined to support all from introduction to in-depth.
  • the IP service core network of the IP access network can support any kind of mobile or fixed, wired or wireless IP connectivity access network (IP-CAN, IP Connectivity Access Networks).
  • IP-CAN IP Connectivity Access Networks
  • the IMS domain has the feature of roaming, and it can roam through IMS regardless of where the user accesses the network.
  • the IP-CAN roaming mode returns to the home S-CSCF (Serving Call Session Control Function) to provide services.
  • S-CSCF Serving Call Session Control Function
  • FIG. 5 one is based on the above roaming mode 2, as shown by the dotted line in the figure (2), the user is attached to the visited IP-CAN (taking GPRS as an example, data connection is performed via the visited SGSN and GGSN).
  • the user will access the IMS network through the visited P-CSCF (Proxy Call Session Control Function).
  • the function of controlling the filtering application server may be added by the visited network P-CSCF; one is based on the above roaming mode, as shown by the dotted line in the figure (1), the user is attached to the home IP-CAN (via the visited SGSN) And the home GGSN), the IMS user accesses the IMS network through the home P-CSCF, which is very convenient and flexible at this time, and can use the existing technology or the method of the above-mentioned visited network access rule application, and can also adopt The method of applying the rule to the home network (such as filtering in the GGSN).
  • the embodiment of the present invention provides that the roaming user accesses the network to filter the content of the user's transceiving content, and obtains the home network where the roaming user is located, so that the content sent and received by the roaming user can be directly filtered in the home network. Therefore, the problem of wasting network resources and processing delay in the above roaming mode is avoided, and the IMS home domain control idea is met.
  • FIG. 6 is a flowchart of filtering data in and out of the GGSN by the local IMS triggering service layer application server HCS according to the IP-CAN roaming in FIG. 5 according to the embodiment of the present invention. Specifically include:
  • the H-IMS checks the downloaded filtering rule of the user, which is used to control the registration of the business application to the application server.
  • the H-IMS generates a third-party registration request according to the filtering rule, and sends the third-party registration request to the HCS, where the registration request carries the user identifier, and preferably, the registration request is further It can carry a VCS address or a VN IMS address, or other identifier indicating that the user is roaming.
  • the HCS After receiving the registration request, the HCS returns a 200 (OK) response to the H-IMS. M64. If the registration request carries the VCS address or the VN IMS address in the step M62, the HCS requests the content filtering rule directly or through the VN IMS to the VCS, where the request carries the user identifier, and may also carry the HCS. address.
  • the HCS needs to obtain the VN IMS or VCS address from the HSS, and then perform the operation of step M64.
  • the HCS needs to obtain whether to roam to the HSS, and obtain the VN IMS or VCS address when roaming, and confirm the roaming and then perform the operation of step M64.
  • the filtering rule corresponding to the user is only the content filtering rule of the HN, and there is no filtering rule of the previous roaming place.
  • VCS takes out its public content filtering rule and saves the user ID and HCS address correspondingly; or adds the user ID to the HCS correspondence list.
  • the VCS returns its public content filtering rules to the HCS, which may also carry user identification and VCS addresses.
  • the HCS processes the received content filtering rules as needed and stores the user ID, VCS address, and filtering rules in the rule database.
  • the processing procedure of the received filtering rule by the HCS possibly syntax and semantic conversion
  • the obtained filtering rule or the converted filtering rule is separately stored from the self-filtering rule, so as to be separately executed during subsequent filtering, or with the self-filtering rule
  • the post-merger storage is performed for subsequent filtering. Similar to the corresponding portion of step S18 in FIG. 3, specifically mentioned above, and details are not described herein again.
  • FIG. 3 a schematic diagram of an embodiment for processing a filtering rule of a roaming user HN based on the processing flow of the foregoing FIG. 3 or FIG.
  • the content source sends the content and the receiving user identity directly to the VN (refers to adopting the current second roaming mode); or the CR first sends the content and the receiving user identity to the HN of the user, and then the HN is based on the user
  • the identification query roams out the user record table. When the user record is found, the HN knows that the user has roamed to the foreign network, and directly blocks the VN that the HCS sends to the user for the CR to play the content (refer to adopt the current first roaming mode). ).
  • the VN queries the roaming out user record table according to the user identifier. If not found, the VN sends the content sent by the HN and its receiving user ID to the VCS, and requests the VCS to filter the content. If the VCS cannot identify the user ID brought by the CR, Then, the VN needs to find the user identifier that can be identified by the VCS according to the user identifier brought by the CR, and then send it to the vcs.
  • the VCS queries the roaming user status record table according to the received user identifier, finds that the roaming user record has been recorded, and the roaming identifier is roaming in, according to the user identifier, the user is matched in the rule database in the roaming state. All the content filtering rules that are followed (including the filtering rules that the user should follow to send and receive content in the HN, and further if the VCS has rules for filtering all the received and sent content, the VCS also filters all the sent and received content), and uses matching. The filtering rule is filtered for each roaming user's content; on the other hand, the VCS records the current time point of each execution of the content filtering process as the most recent execution time.
  • the VCS sends the filtered content and the user ID to the VN (wherein the VCS can directly feed the filtered content to the device that sends the content, or can feed back to other devices in the VN that have the content sending capability).
  • the VN determines the recipient address based on the received user identity, and assembles the filtered content into a packet format that meets the requirements, and then sends it to the receiving user (User).
  • FIG. 8 is a schematic diagram of an embodiment of processing, according to the process flow of FIG. 6 , the filtering rule in the roaming user VN is obtained and stored on the HN, and the content sent by the roaming user is subsequently filtered, including Steps:
  • the CR sends the content and the receiving user ID directly to the HN (such as in the home network).
  • the HN sends the received content and user ID to the HCS, requesting the HCS to filter the content of the user.
  • the user identifier received by the HCS matches all the content filtering rules that the user should follow in the roaming state in the rule database, and uses the matched filtering rules to filter the content of each sending and receiving of the roaming user.
  • the HCS records the current time point at which the content filtering process is performed each time as the most recent execution time.
  • the HCS sends the filtered content and its user ID to the HN.
  • the HN determines the VN SGSN address according to the received user identity, and assembles the filtered content into a qualified packet format and sends it to the VN SGSN.
  • VN sends the content to the receiving user ( User ).
  • FIG. 9 a flowchart for processing the filtering rule in the roaming user HN based on the processing flow of FIG. 3 or FIG. 4 is performed on the basis of the VN, and the subsequent filtering rule is updated.
  • the HCS triggers the filtering rule update operation (S50) when it detects that the rules (public rules) for filtering all the sent and received contents change, and/or the private filtering rules set by the roaming user change (S50); HCS Determining that the change of the filtering rule will affect all roaming users in the roaming user status record table as roaming out, then send the changed filtering rule to the VCS according to the corresponding saved VCS address to request the VCS to the currently saved HN.
  • the filtering rule is updated, and the update request message carries the roaming user identifier (S51); the VCS queries the rule database according to the received user identifier, and updates the currently stored HN in the rule database based on the received updated filtering rule.
  • VCS Filter rule (S52); VCS returns an update success response to HCS, if HCS does not To the response message, the update request message in the above S51 may be retransmitted after a certain time interval. If the HCS cannot receive the response of the VCS feedback after resending the update request message of the specified number of times, it may consider terminating the sending update. Request message (S53).
  • the replacement of the VCS and the HCS in FIG. 9 may be used as a process flow for acquiring the filter rule in the roaming user VN based on the filtering rule in the process flow of FIG.
  • the VCS triggers a filtering rule update operation (S50) when it detects that the rule (public rule) for filtering all the sending and receiving contents changes; the VCS sends the changed filtering rule to the HCS according to the saved HCS address to request the HCS pair.
  • the filtering rules in the currently saved VN are updated.
  • the third embodiment of the present invention is configured to obtain a filtering rule and perform content filtering.
  • the process of the process wherein the overall processing of S60 to S74 is similar to the process of S20 to S31 in FIG. 4, except that the HCS feeds back the filtering rule corresponding to the feedback filtering rule when the filtering rule is fed back to the VCS, and then the VCS saves
  • the filtering rule sent by the HCS also stores the rule identifier corresponding to the filtering rule, where the filtering rule identifier may be a rule ID, or may be a combination of a corresponding rule ID and update time information, which can uniquely represent a rule. .
  • the rule identifier is not limited to be combined with the rule acquisition mode in this embodiment, and may also be used for the rule acquisition manner triggered when the roaming user and other situations are detected for the first time.
  • this embodiment explicitly executes its own filtering rule, and at the same time, obtains the HCS filtering rule, and then executes the obtained or converted filtering rule.
  • FIG. 11 a schematic diagram of an embodiment for processing a filtering rule of a roaming user HN based on the processing flow of FIG. 10 is performed on a VN basis, and subsequent filtering of content sent by the roaming user is performed, where:
  • the CR sends the content and the receiving user ID directly to the VN (refers to adopting the current second roaming mode); or the CR first sends the content and the receiving user identifier to the HN of the user, and then the HN roams out according to the user identifier query.
  • the user record table finds that the user record is HN, and the HN knows that the user has roamed to the foreign network, directly shielding the HCS from filtering the content sent by the CR to the user, and directly transmitting the content sent by the CR and the receiving user identifier. Forwarded to the VN that the user is roaming (referring to the current first roaming mode).
  • the VN queries the roaming out user record table according to the user identifier. If not found, the VN sends the content sent by the HN and the receiving user ID to the VCS, and requests the VCS to filter the content. If the VCS cannot identify the user ID brought by the CR, Then, the VN needs to find the user identifier that can be identified by the VCS according to the user identifier brought by the CR, and then send it to the VCS.
  • the VCS queries the roaming user status record table according to the received user identifier, finds the record that the roaming user has been recorded, and the roaming identifier is roaming in, indicating that the VCS has invoked the corresponding content filtering rule from the HCS.
  • the VCS extracts and stores the stored user identifier and the rule identifier stored corresponding to the content filtering rule that has been called to the HCS. Filtering is allowed. Identifies and compares the matching filter rule identifier with the filter rule identifier sent by the VCS. If the comparison result is different, the filter rule in the HCS has been updated.
  • the HCS extracts the updated filtering rule and its corresponding rule identifier, and then returns a rule update response to the VCS, where the rule update response carries the user identifier, the updated filtering rule, and the corresponding rule identifier; If the comparison result is different, the HCS does not update the response message to the VCS feedback rule; if the VCS does not receive the response message, the message in the above S83 may be resent after a certain time interval, if the VCS is resending the specified number of times. After the message, if the response of the HCS feedback is still not received, then the message can be considered to be terminated, and S88 and its subsequent steps are continued.
  • the VCS updates the corresponding record of the local based on the new filtering rule of the HCS feedback and the corresponding new rule identifier;
  • the VCS matches the latest content filtering rule that the user needs to use in the HN according to the user identifier, and filters the content sent by the CR based on the matched HN filtering rule;
  • the current time point at which the content filtering process is performed is recorded as the most recent execution time.
  • the VCS sends the filtered content and the user identifier to the VN (wherein the VCS can directly feed the filtered content to the device that sends the content, or can feed back to other devices in the VN that have the content sending capability).
  • the VN determines the recipient address based on the received user identity, and assembles the filtered content into a packet format that meets the requirements, and then sends it to the receiving user (User).
  • FIG. 12 a schematic diagram of processing a first embodiment of the obtained filtering rule for the VCS is deleted, where:
  • the VCS detects the roaming status record of the user in the roaming status record table after detecting that the time interval for filtering the content sent and received by the roaming user has been exceeded for a specified period of time.
  • the user's ID, roaming ID, HCS address, and most recently executed time may also have the rule ID corresponding to the filtering rule.
  • the user's record in the rule database is deleted, and the record contains the user's ID and its corresponding filter rule.
  • the VCS notifies the HCS to delete the roaming status record of the user in the roaming status record table, where the notification message carries the user ID and the VCS address. 5102.
  • the HCS queries the roaming status record of the user in the roaming status record table according to the user identifier: if the roaming identifier in the roaming status record is roaming out, and the recorded VCS address is the same as the received VCS address, the roaming status is deleted. If the roaming ID in the roaming status record is roaming, but the recorded VCS address is different from the received VCS address, the user has roamed to the new VN; if the roaming ID in the roaming status record is not roaming, The user has returned to HN.
  • the HCS returns a deletion success response to the VCS. If the VCS does not receive the response message, the notification message in the above S101 may be resent after a certain time interval. If the VCS resends the specified number of times, the VCS cannot receive the message. The response to the HCS feedback may be considered to terminate the transmission of the notification message.
  • the HCS notifies the HN to delete the record of the user in the roaming out user record table, where the notification message carries the user identifier.
  • the HN queries the user's record in the user record table according to the user ID and deletes it.
  • the HN returns a deletion success response to the HCS. If the HCS does not receive the response message, the notification message in the foregoing S104 may be resent after a certain time interval. If the HCS retransmits the message a specified number of times, the HCS cannot receive the message. In response to the HN feedback, it may be considered to terminate the transmission of the notification. Similarly, replacing the VCS and HCS in FIG. 12 may be obtained as a process based on FIG. 6 to acquire the filtering rule in the roaming user VN.
  • the HCS detects that the time interval for filtering the content sent and received by the roaming user has exceeded a specified length of time, or receives the H-IMS for registration cancellation.
  • the VN filtering rule corresponding to the user in the rule database is deleted or the merged filtering rule is restored to only the filtering rule.
  • the HCS notifies the VCS to delete its reserved HCS address, and the notification message carries the user identifier and the HCS address.
  • the VCS deletes its record according to the user ID, or deletes the user ID from the list of user identifiers corresponding to the HCS, and returns a delete success response to the HCS. Since the filtering server of FIG.
  • FIG. 13 a schematic diagram of processing a second embodiment of the obtained filtering rule for the VCS is deleted, where:
  • the HCS When receiving the filtering rule acquisition request message sent by the VCS, the HCS queries the roaming identifier in the roaming status record of the user as the roaming out, and the VCS address recorded therein and the VCS address carried in the received obtaining request message. If the user has roamed from the original roaming site to the new VN, the HCS triggers the VCS to delete the obtained filtering rule.
  • the HCS receives the content to be filtered, the roaming identifier in the roaming status record of the user is not roamed, indicating that the user has returned to the local network after roaming to the foreign network, and the HCS triggers the VCS deletion to be obtained. Filter rules to;
  • the HCS notifies the VCS to delete the roaming status record of the user in the roaming status record table of the user and the content filtering rule of the user in the rule database, where the notification message includes the user identifier; the roaming status record includes the roaming identifier, the user identifier, HCS address, latest execution time, and the like, wherein the roaming identifier includes roaming in, roaming, and roaming.
  • the HCS notifies the HN to delete the record of the user in the roaming out user record table, where the notification message carries the user identifier.
  • the HN deletes the record of the user in the roaming user record table according to the user identifier carried in the received notification message.
  • the HN returns a deletion success response to the HCS. If the HCS does not receive the response message, the notification message in the above S112 may be resent after a certain time interval. If the HCS resends the specified number of times, the HCS cannot receive the message. In response to the HN feedback, it may be considered to terminate the sending of the notification message.
  • the VCS deletes the roaming status record of the user in the roaming status record table of the user and the content filtering rule of the user in the HN in the rule database according to the user identifier carried in the received notification message.
  • the VCS returns a successful response to the HCS feedback. If the HCS does not receive the response message, the notification message in the above S111 may be resent after a certain time interval. If the HCS resends the specified number of times, the HCS cannot receive the message. To respond to the VCS feedback, you can consider terminating the sending of the notification message.
  • the interface filtering technology is applied to the interface diagram of the WCDMA R99 system, wherein the content filtering server (CS) provides both the SS7 address of the circuit domain and the IP of the packet domain. address.
  • the CS-1 interface between the CS and the SGSN uses the GTP protocol (including the control plane GTP-C, the user plane GTP-U), and the CS-2 interface between the CS and the MSC/VLR uses the SS7 protocol, between the CS and the HLR.
  • the CS-3 interface only transmits signaling, usually adopts the MAP protocol in SS7, and the CS-4 interface between CS and CS adopts GTP protocol (including control plane GTP-C, user plane GTP-U).
  • the interface filtering technology is applied to an interface based on an IMS network architecture according to an embodiment of the present invention.
  • the existing ISC interface is used between the CS and the CSCF.
  • the existing Sh interface is used between the CS and the HSS.
  • the CS and the IP connection access network are connected through the CS-1 interface.
  • the reference point of the IP connection access network is determined by the specific network. It is determined that it may be a GGSN of WCDMA/GRPS, an HA of CDMA2000, etc., and CS and CS are connected through a CS-4 interface.
  • a schematic diagram of a content filtering technology applied to a WCDMA R99 system is divided into four parts: a terminal (on behalf of a user), an access network, a core network, and an external network, where the terminal, the access network, and the core
  • the network constitutes the WCDMA R99 system.
  • the terminal interacts with the access network through the Uu interface
  • the access network interacts with the core network through the Iu interface.
  • the core network only identifies the main network components and interfaces.
  • the MSC/VLR interacts with the CS through the CS-2 interface.
  • the MSC/VLR interacts with the HLR through the D interface.
  • the GMSC interacts with the HLR through the C interface. MSC/VLR and GMSC.
  • the SGSN interacts with the HLR through the Gr interface, and the SGSN interacts with the GGSN through the Gn interface.
  • the SGSN interacts with the CS through the CS-1 interface, and the GGSN uses the Gc interface to interact with the SS7 signaling on the TDM.
  • the HLR interacts, and the GGSN interacts with the external Internet through the Gi interface.
  • the CS and the HLR interact through the CS-3 interface.
  • the MSC/VLR and the GMSC are the main components of the circuit domain, through which the terminal completes the circuit domain service interaction in the WCDMA network, or through its access to the external circuit domain service network such as the PSTN.
  • the SGSN and the GGSN are the main components of the packet domain, through which the terminal completes the packet domain service interaction within the WCDMA network, or through which it accesses the Internet, where the CS and the HLR serve both the circuit domain component and the packet domain component.
  • CS uses the IETF Common Policy (see www.ietf.org website draft-ietf-geopriv-common-policy) to describe the content filtering rules and uses the semantic mapping table to perform different filtering.
  • IETF Common Policy see www.ietf.org website draft-ietf-geopriv-common-policy
  • the matching and conversion of rule semantics enables different CSs to correctly identify and convert content filtering rules between each other.
  • the following is an example.
  • the IETF's Common Policy uses XML to describe, defines the authorization policy framework for application data access control, and clarifies the way public policy rules are described. This public policy framework can be extended. Exhibition to other application areas.
  • the Policy is a Rule Set, which consists of a number of rules. Each Rule includes three parts: Conditional Expressions, Actions, and Transformations. Conditions are collections of conditional expressions, each of which is either TRUE or FALSE. When a content filtering request arrives, it needs to be matched with each Rule in the Rule Set. All Rule whose conditional expressions are TRUE in the Conditions section is the Rule to which the request applies. Actions are operations that specifically filter content. Transformations are modifications to the specific content sent to the user.
  • the semantic mapping table is used to perform matching and conversion of different filtering rule semantics.
  • a specific semantic mapping table is shown in Table 1 below.
  • a database or a simple program can be used to express the semantic mapping table to provide a query service. And return the result information of the matching operation.
  • the content section contains XXX, or XX, or XXXX, or XXXXXX;
  • action is blocked, and the content is filtered out.
  • Execution action action is to block the block, the content is filtered out.
  • the action action is blocked block, and the content is filtered out.
  • the content filtering server U of the US needs to obtain the public filtering rule of the home network content filtering server C of the user A and the private filtering rule set by the user A, and the obtained filtering rule.
  • the public filtering rules of the content filtering server U corresponds to the public filtering rules of the content filtering server U, as follows:
  • the content filtering server U obtains the public filtering rule and the private filtering rule of user A from the content filtering server C;
  • the content is classified as Sexl, or the content section contains XXX, or XX, or XXXX, or XXXXXX;
  • a content provider of the Internet network sends the content requested by the user A to the GGSN-S according to the IP address of the user A; the GGSN-S sends the content to the SGSN-S through the Gn interface according to the IP address of the user A, The SGSN-S searches for the IMSI of the user A according to the received IP address, and sends the received content and the found IMSI to the content filtering server CS-S of the G site, requesting it to filter the content.
  • the CS-S requests the VLR-S of the G to request the address of the home network F according to the received IMSI that does not query the roaming status record of the user A.
  • the VLR-S queries the address of its HLR based on the IMSI, and then returns the HLR-B address of the F to the CS-S.
  • CS-S requests User A's filtering rule from HLR-B with its own address, and HLR-B forwards the request to CS-B of F.
  • CS-B queries its user's IMSI for its roaming status record and finds that its roaming identity is not roaming.
  • CS-B sets it to roam out and saves the CS-S address.
  • CS-B sends its own public filtering rules and private filtering rules set by User A and CS-B addresses to CS-S.
  • the CS-S adds A to the user roaming status record, saves the CS-B address, processes and saves the filtering rule for obtaining the filtering, and correctly associates the saved filtering rule with the IMSI, and sets the roaming identifier of the user A to roam.
  • CS-S and CS-B use the same syntax and are based on the same classification level, there is no need to identify and convert syntax and semantics.
  • the CS-S If the CS-S queries the roaming status record of the user A according to the received IMSI, and the roaming identifier is roaming in, the CS-S matches the corresponding filtering rule in the roaming status record of the user A according to the IMSI, including CS-S public filtering rules, CS-B public filtering rules, and user A's private filtering rules;
  • the CS-S filters the content based on its own public filtering rules and the public filtering rules of the existing CS-B and the private filtering rules of the user A, and records the current time of each filtering process as the latest execution time.
  • the CS-S sends the filtered content and IMSI to the SGSN-S. SGSN-S according to the IMSI Send to user A who is roaming in G.
  • Rule update processing If the public filter rule of CS-B is changed, CS-B sends the changed public filter rule to CS-S according to the CS-S address recorded in user A's roaming status record, requesting CS-S A rule update process is performed, wherein the request message carries the IMSI of the user A.
  • the CS-S queries the user roaming status record based on the IMSI and finds that the roaming ID of the record is roaming. Then, the previously stored CS-B public filtering rule is updated by using the received filtering rule.
  • the CS-S returns an update success response message to the CS-B.
  • Rule deletion processing CS-S detects that the content that has been sent and received the last time from user A is processed for more than 48 hours, and CS-S deletes all records in user A's roaming status record, including the original The stored filtering rules obtained from the CS-B side.
  • the CS-S notifies the CS-B to delete the roaming status record of the user A, which carries the IMSI and CS-S addresses of the user A.
  • CS-B » IMSI queries the user roaming status record and finds that the roaming ID recorded in it is roaming out and the recorded CS address is the same as the received CS address, then the roaming record of user A is deleted.
  • the CS-B returns a successful deletion response message to the CS-S. As shown in FIG.
  • a system structure diagram and a processing structure diagram of the VCS and the HCS are configured to implement the foregoing embodiment of the present invention, wherein the network content filtering server (VCS) 100 is visited, and the home network of the roaming user can be obtained. Transmitting and filtering the content, and filtering the content sent and received by the roaming user based on the obtained filtering rule; the home network content filtering server (HCS) 200, according to the obtaining request sent by the VCS 100, sending and receiving the content to the user The rules for filtering are sent to the VCS 100.
  • the VCS 100 may also need to convert the filtering rules obtained from the HCS 200 into syntax semantics that can be recognized by itself, and filter the content sent and received by the roaming users based on the converted filtering rules.
  • the VCS 100 stores its own rules for filtering all the received and sent content, it also filters the content sent and received by the roaming user based on the rules for filtering the received and sent content; in this case, the VCS 100 may need to filter its own.
  • the rules are merged with the filtering rules obtained from the HCS 200, and the content sent and received by the roaming users is filtered based on the combined filtering rules. If the current roaming mode is adopted, the content sent and received by the roaming user needs to be processed by the home network. Therefore, in this case, the HCS 200 shields the filtering of the content, but directly The home network sends the content to the visited network where the roaming user is located for content filtering processing.
  • the obtaining unit 101 acquires a rule for filtering the user's transceiving content to the roaming user home network; in the HCS 200, the request receiving unit 201 is configured to receive the obtaining request sent by the VCS 100 in the visited network where the roaming user is located. And the obtaining request is used to request a rule for filtering the content sent and received by the user; the filtering rule feedback unit 202 is configured to receive the unit according to the request
  • the received request received by 201 is queried in its own rule database 203 for the rules for filtering the content sent and received by the user and fed back to the VCS 100.
  • the rule database 102 in the VCS 100 stores the filter rule acquired by the obtaining unit 101.
  • the rule database 102 may also store rules for filtering the received and sent content by the VCS 100 itself, and the filtering unit 103 is configured to store in the rule database 102.
  • the filtering rule filters the content sent and received by the roaming user.
  • the change rule sending unit 204 in the HCS 200 when detecting that the rule for filtering the content of the user to send and receive the content stored in the rule database 203 changes, the changed filter rule is sent to the VCS 100 in the visited network where the roaming user is located;
  • the first rule update unit 104 in the VCS 100 updates the acquired filter rules stored in the rule database 102 by the post-base filter rule.
  • the obtaining unit 101 in the VCS 100 obtains the rule identifier corresponding to the filtering rule, and stores the obtained rule identifier in the rule database 102 corresponding to the obtained filtering rule.
  • the rule identifier sending unit 105 extracts the stored rule identifier in the rule database 102 and sends it to the home network of the roaming user, for example, the rule identifier sending unit 105 can
  • the VCS 100 sends a rule identifier to the home network of the roaming user.
  • the rule identifier comparison unit 205 in the HCS 200 compares the rule identifier sent by the VCS 100 in the visited network where the roaming user is located and the rule identifier stored in the rule database 203 corresponding to the roaming user.
  • the update result feedback unit 206 is in the rule identifier comparison unit. When the comparison result of the 205 is consistent, the VCS 100 in the visited network of the roaming user feeds back the notification of the change of the filtering rule, and when the comparison result is inconsistent, the new filtering rule and the corresponding new rule identifier are sent to the roaming user. Visit VCS 100 on the network.
  • the second rule update unit 106 in the VCS 100 identifies and responds to the roaming user according to the rule identifier sent by the rule identifier sending unit 105 according to the home network of the roaming user.
  • the new filter rules sent and their corresponding new rule identifiers update the filter rules stored in the rule database 102 and their corresponding rule identifiers.
  • the first rule deleting unit 107 in the VCS 100 detects that no content is transmitted to the roaming user within a predetermined time and the roaming user does not issue the content, and then the acquired filtering rule stored in the rule database 102 is deleted.
  • the rule deletion notification unit 207 in the HCS 200 notifies the VCS 100 in the visited network to delete the acquired filtering rule when detecting that the roaming user moves out of the current visited network, and then deletes the unit by the second rule in the VCS 100. 108.
  • the acquired filtering rule stored in the rule database 102 is deleted.
  • the above two rules are deleted. You can use one or two of them in the specific implementation process. You can also consider using other rules to delete.
  • the content sent to the user roaming in the VN is also processed by its HN, so in this case the HCS 200 in the HN also includes the roaming judging unit 208.
  • the HCS 200 in the HN also includes the roaming judging unit 208.
  • the filtering and shielding unit 209 shields the content sent and received by the user from filtering when the user roams, and the HN sends the content to be filtered to the roaming. Filtering is performed in the VN where the user is currently located.
  • an embodiment of the present invention further provides a content filtering server, where the content filtering server includes: a rule acquiring unit and a filtering unit.
  • the rule obtaining unit is configured to acquire, in the second network, a rule for filtering, by the first network where the roaming user is located, the content that is sent and received by the user, where the filtering unit is configured to send and receive the roaming user according to the filtering rule.
  • the content is filtered.
  • the content filtering server further includes at least one of the following units: a converting unit and a self filtering unit.
  • the converting unit is configured to: after the filtering rule acquired by the acquiring unit is converted into the syntax semantics that the filtering unit can recognize, send the converted filtering rule to the filtering unit; And a unit, configured to filter content that is sent and received by the roaming user according to a filtering rule in the second network.
  • the content filtering server may include the following three cases:
  • One is, including: a rule acquisition unit, a filter unit, and a conversion unit, where the conversion unit is divided into Do not connect to the rule acquisition unit and filter unit.
  • the method includes: a rule obtaining unit, a filtering unit, and a self-filtering unit, where the connection manner of each unit may be: the filtering unit and the self-filtering unit are respectively connected to the rule acquiring unit, or may be the filtering unit and the rule acquiring unit respectively. It is connected to the self-filtering unit, and may also be a self-filtering unit connected to the rule acquiring unit and the filtering unit respectively.
  • One is: a rule acquisition unit, a filter unit, a conversion unit, and a self filter unit.
  • the specific connection manner of each unit may be: the conversion unit is respectively connected to the rule acquisition unit and the filter unit, and the self filter unit is connected to the filter unit; or the conversion unit is respectively connected to the rule acquisition unit and the filter unit, and is filtered by itself. The unit is then connected to the acquisition unit.
  • the content filtering server may further include: a combining unit, configured to: at least one of a filtering rule acquired by the rule acquiring unit or a filtering rule converted by the converting unit and the second network itself The filtering rules are merged, and the combined filtering rules are sent to the filtering unit.
  • a combining unit configured to: at least one of a filtering rule acquired by the rule acquiring unit or a filtering rule converted by the converting unit and the second network itself The filtering rules are merged, and the combined filtering rules are sent to the filtering unit.
  • a combining unit configured to: at least one of a filtering rule acquired by the rule acquiring unit or a filtering rule converted by the converting unit and the second network itself The filtering rules are merged, and the combined filtering rules are sent to the filtering unit.
  • only the rule acquisition unit and the combination unit may be connected, or the rule acquisition unit, the conversion unit, the combination unit, and the filter unit may be sequentially connected, and the combination unit may be separately added on the basis of
  • the content filtering server further includes at least one of the following units: a first rule update unit and a first rule deletion unit.
  • the first rule updating unit is configured to update the acquired filtering rule according to the filtering rule of the roaming user.
  • the first rule deleting unit is configured to: when the second network detects that the roaming user does not receive and send content during the specified time, delete the acquired filtering rule.
  • the second network when the first network is a home network, the second network is a visited network; or when the first network is a visited network, the second network is a home network.
  • the rule obtaining unit includes: a first rule acquiring subunit, and further comprising: a rule identifier acquiring subunit, a rule identifier sending unit, and a second rule updating unit .
  • the first rule obtaining sub-unit is configured to: when the roaming user is detected for the first time in the visited network or the content received and received by the roaming user is received for the first time, the rule for filtering the content sent and received by the user in the home network where the roaming user is located is obtained.
  • the rule identifier acquisition sub-unit is configured to obtain a rule identifier corresponding to the filter rule when acquiring the filter rule.
  • the rule identifier sending unit is configured to send the rule identifier to the home network of the roaming user
  • the second rule updating unit is configured to send, according to the rule identifier sending unit, the rule label sent by the roaming user home network
  • the content filtering server when the content filtering server serves to visit the network, the content filtering server further includes: a second rule deleting unit, configured to: after receiving the rule deletion notification sent by the home network when detecting that the roaming user moves out of the visited network When you delete the acquired filter rules.
  • a second rule deleting unit configured to: after receiving the rule deletion notification sent by the home network when detecting that the roaming user moves out of the visited network When you delete the acquired filter rules.
  • the acquiring unit includes: a second rule acquiring subunit, configured to detect, at the home network, that the roaming user first registers, when the content is
  • the content filtering server further includes:
  • the third rule deleting unit is configured to delete the acquired filtering rule when the home network detects that the registration of the roaming user is released.
  • the embodiment of the present invention avoids the first roaming mode when the user roams on the visited network, because the visited network/home network accesses the content filtering rule of the home network/visiting network.
  • the content needs to be filtered separately in the home network and the visited network, thereby shortening the filtering processing time and reducing the waiting time of the user, thereby improving the user experience.
  • the embodiment of the present invention can be compatible with the second roaming mode, so that the transmission of the content between the home network and the visited network can be avoided, so that the intermediate transmission failure or the content filtering provider failure of the other party is not affected, which is beneficial to content filtering.
  • the normal execution of the service can be compatible with the first roaming mode, and conforms to the IMS home domain control idea.

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Description

对漫游用户通信内容过滤的方法、 系统及过滤服务器
本申请要求于 2006 年 12 月 7 日提交中国专利局、 申请号为 200610157353.8、 发明名称为"对漫游用户通信内容过滤的方法、 系统及内容 过滤服务器"的中国专利申请的优先权，其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域中的内容过滤技术，尤其是涉及一种对漫游用户的通 信内容进行过滤的方法、 系统、拜访网络内容过滤服务器、 归属拜访网络内容 过滤服务器及内容过滤服务器。
背景技术
目前，在通信网络中的内容过滤技术一般包括名单过滤技术、关键词过滤 技术、 图像过滤技术、模板过滤技术及其分类过滤技术等， 在通信网络中进行 内容过滤的目的是让通信用户远离恶意的内容或不愿意接收的内容，保障通信 网络的文明交互。
如图 1所示为现有技术中用户处于漫游状态下，其归属网络和拜访网络分 别具有内容过滤机制的系统结构示意图，这里归属网络 10和拜访网络 20均为 无线通信网络， 其包括无线接入网和核心网 （可能包括业务控制网， 如： IP 多媒体子系统（IMS , IP Multimedia Subsystem ), 还可能包括业务网等）。 归 属网络 10和拜访网络 20之间可以通过核心网进行交互。 内容源 30指内容提 供者， 其可以是独立于无线通信网络的外部实体（如 Internet内容服务器）， 也 可以是无线通信网络的内部实体（如短消息中心；)，这里以内容源 30独立于无 线通信网络为例来进行描述。 归属网络内容过滤服务器 40和拜访网络内容过 滤服务器 50分别为归属网络 10和拜访网络 20提供内容过滤服务， 它们可以 是由内容过滤提供商负责的单独实体，也可以是由无线通信网络运营商自己负 责的实体， 为了便于描述，这里将归属网络和拜访网络内容过滤服务器分别独 立于无线通信网络来描述， 归属网络内容过滤服务器 40和拜访网络内容过滤 服务器 50可以分别和内容源 30进行交互，并且它们之间也可以进行相互交互。 归属网络公用规则管理者 60负责管理归属网络 10中的公有过滤规则，即归属 网络内容过滤服务器 40基于归属网络公用规则管理者 60设置的规则对所有内 容进行过滤处理， 同时如果内容过滤订阅者 80为相关用户或相关用户群组设 置了内容过滤规则， 则归属网络内容过滤服务器 40在基于归属网络公用规则 管理者 60设置的规则对相关用户或相关用户群组的内容进行过滤时， 还要基 于内容过滤订阅者 80设置的内容过滤规则对内容进行过滤。 同理拜访网络公 用规则管理者 70负责管理拜访网络 20中的公有过滤规则，即拜访网络内容过 滤服务器 50基于拜访网络公用规则管理者 70设置的规则对所有内容进行过滤 处理。
这样当用户 90处在归属网络 10中时， 与用户 10相关的内容要遵循的过 滤规则包括归属网络公用规则管理者 60 所管理的规则和内容过滤订阅者 80 设置的过滤规则； 当用户 90漫游到拜访网络 20中时， 与用户 10相关的内容 除要遵循上述在归属网络中的过滤规则外 ,还要遵循拜访网络公用规则管理者 70所管理的规则。
图 2所示为基于图 1的系统结构，内容源将相关内容发送给处在拜访网络 中的漫游用户的内容过滤过程示意图， 其内容过滤过程具体如下：
51. 内容源 （ CR, Content Resource )将内容和接收方用户标识发送到用 户的归属网络（ HN , Home Network );
52. HN将内容和接收方用户标识发送给归属网络内容过滤服务器（ HCS , Home Content Screening Server ), 请求其进行内容过滤， 如果 HCS不能识别 CR带来的接收方用户标识， HN需要根据 CR带来的接收方用户标识找到对应 的 HCS可识别的用户标识并发送给 HCS;
S3. HCS根据接收方用户标识匹配出内容在 HN应该遵循的所有过滤规则
(包括公有过滤规则， 可能还包括由内容过滤订阅者设置的私有过滤规则）， 并依据应该遵循的所有过滤规则对内容进行过滤处理；
54. HCS将过滤结果和接收方用户标识发送给 HN;
55. HN 将过滤结果和接收方用户标识发送给拜访网络 ( VN, Visited Network );
56. VN将接收到的过滤结果和接收方用户标识发送给拜访网络内容过滤 服务器（ VCS , Visited Content Screening Server )， 请求其进行内容过滤 , 如果 VCS不能识别 HN带来的接收方用户标识， VN需要根据 HN带来的接收方用 户标识找到对应的 VCS可识别的用户标识并发送给 VCS; 57. VCS按照拜访网络的公有过滤规则对接收到的内容进行过滤处理；
58. VCS将过滤结果和接收方用户标识发送给 VN;
59. VN根据接收方用户标识确定发送地址， 并将过滤结果封装成符合要 求的数据包格式， 然后发送给漫游用户。
但是在上述现有技术中， 内容源发送内容给漫游在拜访网络中的用户时， 发送的内容首先要经过归属网络内容过滤服务器的过滤处理，再经过拜访网络 内容过滤服务器的过滤处理，反之若处在拜访网络中的漫游用户发送内容给内 容源时，发送的内容首先要经过拜访网络内容过滤服务器的过滤处理，再经过 归属网络内容过滤服务器的过滤处理，从而就存在比较耗费网络处理资源、过 滤时间比较长的问题， 同时因单点故障而影响过滤处理的可能性也较大， 以致 对用户处于漫游状态下时收发内容的使用感受造成较大影响。
发明内容
本发明实施例提出一种对漫游用户的通信内容进行过滤的方法及其系统， 以解决对处于拜访网络中的漫游用户收发的内容进行过滤处理时浪费网络资 源及处理时间较长的问题。
相应的，本发明实施例还提供一种拜访网络内容过滤服务器、 归属网络内 容过滤服务器及内容过滤服务器。
为解决上述问题，本发明实施例提供一种对漫游用户的通信内容进行过滤 的方法， 包括步骤：
漫游用户所在第二网络获取漫游用户所在第一网络对该用户收发内容进 行过滤的规则；
根据所述过滤规则对所述漫游用户收发的内容进行过滤。
相应的， 本发明实施例还提供一种内容过滤服务器， 包括：
规则获取单元，用于在第二网络中获取漫游用户所在第一网络对该用户收 发内容进行过滤的规则；
过滤单元， 用于根据所述过滤规则对所述漫游用户收发的内容进行过滤。 另外，本发明实施例提供一种对漫游用户的通信内容进行过滤的系统， 包 括： 拜访网络内容过滤服务器， 用于获取漫游用户归属网络对该用户收发内容 进行过滤的规则 ,并基于获取到的过滤规则对所述漫游用户收发的内容进行过 滤； 归属网络内容过滤服务器， 用于根据所述拜访网络内容过滤服务器发来的 获取请求，将对所述用户收发内容进行过滤的规则发送给拜访网络内容过滤服 务器。
此外， 本发明实施例再提供一种拜访网络内容过滤服务器， 包括： 获取单 元， 用于向漫游用户归属网络获取对该用户收发内容进行过滤的规则； 规则数 据库， 用于存储有所述获取单元获取到的过滤规则； 过滤单元， 用于基于规则 数据库中存储的过滤规则对所述漫游用户收发的内容进行过滤。
本发明实施例又提供一种归属网络内容过滤服务器，包括:请求接收单元， 用于接收漫游用户所在拜访网络中的拜访网络内容过滤服务器发来的获取请 求， 所述获取请求用于请求对该用户收发内容进行过滤的规则； 过滤规则反馈 单元， 用于根据请求接收单元接收到的获取请求， 查询对该用户收发内容进行 过滤的规则并反馈给拜访网络内容过滤服务器。
本发明实施例能够达到的有益效果如下：
本发明技术方案可以避免漫游用户的收发内容分别在归属地和拜访地进 行内容过滤处理， 减小了内容过滤处理时延， 并节约了网络处理资源， 同时也 减少了因单点故障而影响过滤处理的可能性，使得漫游用户能够在拜访地比较 快捷的进行内容收发处理， 提高了用户的使用感受。
附图说明
图 1为现有技术中用户处于漫游状态下，其归属网络和拜访网络分别具有 内容过滤机制的系统结构示意图；
图 2为基于图 1的系统结构，内容源将相关内容发送给处在拜访网络中的 漫游用户的内容过滤过程示意图；
图 3为本发明获取过滤规则的第一实施例处理过程示意图；
图 4 为本发明获取过滤规则并进行内容过滤的第二实施例处理过程示意 图；
图 5为本发明实施例中 IMS两种漫游模式控制流示意图；
图 6为本发明实施例中基于图 5中 IP-CAN漫游，归属地 IMS触发业务层 应用服务器 HCS获取过滤规则用以对进出 GGSN的数据进行过滤的流程图； 图 7为本发明实施例中基于上述图 3或图 4的处理流程将漫游用户 HN中 的过滤规则获取过来存储在 VN的基础上，后续对向漫游用户发送的内容进行 过滤的实施例处理示意图；
图 8为本发明实施例中基于上述图 6的处理流程将漫游用户 VN中的过滤 规则获取过来存储在 HN的基础上，后续对向漫游用户发送的内容进行过滤的 实施例处理示意图；
图 9为基于上述图 3或图 4的处理流程将漫游用户 HN中的过滤规则获取 过来存储在 VN的基础上， 后续对已获取的过滤规则进行更新的处理流程图； 图 10为本发明获取过滤规则并进行内容过滤的第三实施例处理过程示意 图；
图 11为基于上述图 Ί的处理流程将漫游用户 HN中的过滤规则获取过来 存储在 VN的基础上，后续对向漫游用户发送的内容进行过滤的实施例处理示 意图；
图 12为 VCS删除获取到的过滤规则的第一实施例处理示意图； 图 13为 VCS删除获取到的过滤规则的第二实施例处理示意图； 图 14为内容过滤技术应用在 WCDMA R99系统的接口示意图；
图 15为本发明实施例中内容过滤技术应用在基于 IMS网络架构的接口示 意图；
图 16为内容过滤技术应用在 WCDMA R99系统的示意图；
图 17为实施本发明上述实施例所构成的系统结构图及其 VCS、 HCS内部 的处理结构图。
具体实施方式
在目前的无线通信网络技术中，对于漫游用户的内容处理方式， 主要存在 两种处理模式： 第一， 漫游用户接收的内容先后经过归属网络和拜访网络的处 理， 同时漫游用户发送的内容先后经过拜访网络和归属网络的处理； 第二， 漫 游用户收发的内容仅在拜访网络处理。现有技术仅采用在第一种模式下对漫游 用户接收的内容进行处理， 且存在浪费网络资源、 处理时延较长的问题； 同时 对于第二种模式并没有提出如何解决漫游用户收发内容过滤的方案。
本发明实施例不但可以将漫游用户归属网络中对该用户收发内容进行过 滤的规则同步获取到漫游用户所在的拜访网络，这样对于漫游用户收发的内容 可以直接在漫游网络进行过滤处理，从而避免了在上述漫游模式一下浪费网络 资源、 处理时延较长的问题， 同时能够适用于上述的漫游模式二。 还可以将漫 游用户拜访网络中的对该用户收发内容进行过滤的规则同步获取到漫游用户 所在的归属网络，这样对于漫游用户收发的内容可以直接在归属网络进行过滤 处理， 从而避免了在上述漫游模式一下浪费网络资源、 处理时延较长的问题， 符合 IMS的归属域控制思想。
其中， 实现上述过程的方案包括步骤： 漫游用户所在第二网络获取漫游用 户所在第一网络对该用户收发内容进行过滤的规则；根据所述过滤规则对所述 漫游用户收发的内容进行过滤。 其中， 所述第二网络为拜访网络时， 所述第一 网络为归属网络； 或者第二网络为归属网络时， 第一网络为拜访网络。 为了便 于描述， 下面以第一网络为归属网络， 第二网络为拜访网络为例来描述。
漫游用户所在拜访网络到漫游用户归属网络获取的过滤规则为归属网络 对所有收发内容进行过滤的规则 （这里定义为公有规则）， 如果该漫游用户所 在的归属网络中， 存在相应的内容过滤订阅者为该用户设置了其他过滤规则， 则拜访网络获取过来的过滤规则还包括内容过滤订阅者为该用户设置的过滤 规则 （这里定义为私有规则）。 如果漫游用户所在的拜访网络和归属网络达成 协议采用相同的共有规则，则拜访网络从归属网络获取过来的过滤规则只包含 有相应的私有规则。
较佳地， 对于漫游用户所在的拜访网络（VN ) 首次到该用户的归属网络 ( HN )获取过滤规则包括但不限于下面两种情况：
第一： VN发现本次信令交互代表着用户漫游进入本网络， 则触发到 HN 中获取过滤规则的动作；
第二： VN首次接收到发送给漫游用户的内容或漫游用户发来的内容时， 发送相关内容到拜访网络内容过滤服务器（VCS )去请求内容过滤， VCS 查 询到该用户为漫游用户且未获取该用户归属网络的过滤规则时， 则触发到 HN 中获取过滤规则的动作。
下述为方便描述， 将归属网络内容过滤服务器 HCS与归属网络 HN作为 两个处理主体分开进行描述， 但这仅是为描述方便起见， 其 HCS仍为 HN中 的一个网元设备； 同理也将 VCS与拜访网络 VN作为两个处理主体分开进行 描述， 其 VCS仍为 VN中的一个网元设备。
如图 3所示， 为本发明获取过滤规则的第一实施例处理过程示意图，其中 处理过程如下：
510. 当 VN处理用户开机登记、 静止 ( dormant )切换登记、 语音 /数据业 务切换入（如换 MSC切换、 换 PDSN切换、 换 SGSN切换等 )等一系列操作 时， VN会解析出用户的 HN地址， 并以此来判断出用户为漫游用户， 同时根 据操作能判断出这是漫游用户在漫游状态下第一次和本网络进行信令交互。
511. VN通知 VCS获取该用户在其归属网络中所具有的过滤规则， 其中 VN发送的通知消息中携带有该用户的标识和其 HN的地址。
S12. VCS根据 VN发来的通知消息中携带的用户标识， 查询用户漫游状 态记录表， 在没有查询到该用户记录的情况下， 说明需要到该用户的 HN中获 取该用户所具有的过滤规则； 如果查询到了该用户记录，说明已经到该用户的 HN中获取了该用户所具有的过滤规则 ,这种情况在 S13执行后则终止本流程。
513. VCS向 VN返回响应， 通知 VN已收到上述 S11中的通知消息， 如 果 VN没有收到该响应，应间隔一定时间后重发上述 S11中的通知消息， 若在 重复发送规定次数该通知消息后仍一直没有收到该响应， 可以选择终止处理。
514. VCS根据 VN发来的通知消息中携带的 HN地址，向该用户的 HN请 求内容过滤规则， 其中该请求消息中携带有用户标识和 VCS地址。
515. HN解析 VCS发来的请求消息， 发现其是内容过滤规则请求消息， 则根据其请求消息中携带的用户标识查询漫游出用户记录表中是否记录有该 用户的记录， 如果没有记录则添加该用户的记录； 进而 HN将该接收到的请求 消息转发给归属网络内容过滤服务器（ HCS )。
516. HCS ^居接收到的请求消息中携带的用户标识查询用户漫游状态记 录表：如果没有查询到该用户的漫游状态记录，则添加该用户的漫游状态记录， 并将其漫游标识置为漫游出，同时保存接收到的请求消息中携带的 VCS地址； 如果 HCS查询到该用户的漫游状态记录中的漫游标识为漫游出， 但对应保存 的 VCS地址与接收到的请求消息中携带的 VCS地址不同，则说明该用户已从 原保存的 VCS地址对应的 VN漫游到了当前接收到的 VCS地址对应的 VN, 则 HCS用接收到的 VCS地址替换之前已保存的 VCS地址； 而如果查询到该 用户的漫游状态记录中的漫游标识为未漫游，说明该用户从 HN直接漫游到了 VN, 则将其漫游标识置为漫游出， 并保存接收到的 VCS地址。
HCS 还要查询该用户是否被设置有私有过滤规则， 如果该用户被设置了 私有规则， 还要将对应该用户的私有规则查找出。 还查询到了该漫游用户的私有过滤规则 , 则还要将查询到的私有规则反馈给 VCS , 同时在该反馈消息中还携带有用户标识和 HCS地址。
如果 VCS没有接收到此反馈消息， 则应在间隔一定时间后重发上述 S14 中的请求消息，若 VCS在重发规定次数的该请求消息后，仍一直没有收到 HCS 发来的反馈消息， 可以选择终止程序。
S18. VCS根据需要处理接收到的过滤规则并将用户标识和过滤规则对应 保存在规则数据库中，另一方面 VCS在用户漫游状态记录表中添加用户记录， 和用户标识对应存储 HCS地址，并将该用户的漫游标识置为漫游入。关于 VCS 首先如果 VCS和 HCS采用相同的语法来描述过滤规则，则不需进行语法 的识别和转换， 而如果 VCS和 HCS采用不同的语法来描述过滤规则， 则要对 接收到的过滤规则执行语法的识别和转换处理，以让 VCS和 HCS能够互相理 解语法规则； 其次在语义方面， 对于关键字词直接取用， 如果 VCS和 HCS使 用相同的分类分级方法， 则不需要对接收到的过滤规则执行语义的识别和转 换， 而如果 VCS和 HCS使用不同的分类分级方法， 则需要对接收到的过滤规 则执行语义的识别和转换处理。
的过滤规则后执行获取到的或转换后的过滤规则 ,也可以先执行获取到的或转 换后的过滤规则后执行自身的过滤规则），同时还可以将 VCS的公有过滤规则 和获取到的 HCS过滤规则或转换后的 HCS过滤规则进行合并处理，并基于合 并后的过滤规则对漫游用户收发的内容进行过滤处理。
如图 4所示，为本发明获取过滤规则并进行内容过滤的第二实施例处理过 程示意图， 其中处理过程如下： 520. 拜访网络首次接收到漫游用户收发的内容时， 据用户标识查询漫 游出用户记录表，没有找到该用户记录， 则将接收到的内容和用户标识发送给 VCS, 请求 VCS进行内容过滤。
521. VCS根据接收到的用户标识查询用户漫游状态记录表： 在没有查询 到该用户记录的情况下， 判断出需要去 VN获取 HN的地址。
522. VCS向 VN请求用户的 HN地址， 其中该请求消息中携带有用户标 识。
523. VN根据该用户标识查询其 HN地址， 并将该查询到的 HN地址返回 给 VCS。
S24. VCS接收到 VN反馈的该用户的 HN地址后， 判断该用户为漫游入 用户， 需要到该用户的 HN中获取内容过滤规则。
如果判断该用户为本地用户， 则在用户漫游状态记录表中添加该用户记 录， 置漫游标识为未漫游， 终止本流程而直接使用 VCS的公有规则并匹配可 能的私有规则进行过滤并返回结果。
后续的 S25 ~ S29的处理过程与上述图 3处理过程中的 S14〜S18的处理过 程相同或相似， 具体详见上述， 在此不再赘述。
530. VCS根据该用户标识在规则数据库中匹配出该用户在漫游状态下应 该遵循的所有过滤规则（包括用户在 HN中收发内容应该遵循的过滤规则， 进 一步如果 VCS存在对所有收发内容进行过滤的规则，还包括该 VCS对所有收 发内容进行过滤的规则）， 并使用匹配出的过滤规则对该漫游用户的首次收发 内容进行过滤处理； 另一方面 VCS要记录执行该内容过滤处理的当前时间点 以作为最近执行时间。
531. VCS将过滤后的内容及其该用户标识发送给 VN (其中 VCS可以将 过滤后的内容直接反馈给发送该内容的设备，也可以反馈给 VN中的其他具有 内容发送能力的设备）。
另外， 在 3GPP R5、 R6中， IMS从引入到深入， 已经被定义为支持所有
IP接入网的多媒体业务核心网， 可以支持任何一种移动的或固定的、 有线的 或无线的 IP连通性访问网络 ( IP-CAN, IP Connectivity Access Networks)。 IMS 域具有漫游的特性， 不管用户从哪里接入网络都可以通过 IMS 漫游或者 IP-CAN漫游的方式回到归属的 S-CSCF (服务呼叫会话控制功能）提供服务。 如图 5所示， 一种是基于上述漫游模式二， 如图中第 （2 )条虚线所示， 用户附着在拜访地 IP-CAN (以 GPRS为例， 经由拜访地 SGSN、 GGSN进行 数据接入）， 用户将通过拜访地 P-CSCF (代理呼叫会话控制功能）接入到 IMS 网络， 由于数据通道都在拜访网络，应采用上述在拜访网络中获取归属网络中 对应过滤规则应用的方法，针对 IMS网络可由拜访网络 P-CSCF增加控制过滤 应用服务器的功能； 一种是基于上述漫游模式一如图中第 （1 )条虚线所示， 用户附着到归属地 IP-CAN (经由拜访地 SGSN和归属地 GGSN ), IMS用户 通过归属地 P-CSCF接入到 IMS网络中， 此时非常方便、灵活， 既可以使用现 有技术，也可以使用上述拜访网络取规则应用的方法，还可以采用归属网络取 规则应用的方法（如在 GGSN过滤）。
也就是说，本发明实施例提出将漫游用户拜访网络中的对该用户收发内容 进行过滤的规则同步获取到漫游用户所在的归属网络，这样对于漫游用户收发 的内容可以直接在归属网络进行过滤处理，从而避免了在上述漫游模式一下浪 费网络资源、 处理时延较长的问题， 符合 IMS的归属域控制思想。
还请参阅图 6， 为本发明实施例中基于图 5中 IP-CAN漫游， 归属地 IMS 触发业务层应用服务器 HCS对进出 GGSN的数据进行过滤的流程图。 具体包 括：
M61. 当用户首次成功注册后， H-IMS检查所下载的该用户的过滤规则， 其用于控制对应用服务器进行业务应用的注册。
M62. H-IMS根据所述过滤规则， 生成一个第三方注册请求， 并将所述第 三方注册请求发往 HCS, 其中， 所述注册请求携带有用户标识， 优选的， 所 述注册请求中还可以携带 VCS地址或者 VN IMS地址， 或者其它表示该用户 处于漫游状态的标识。
M63. HCS收到所述注册请求后， 向 H-IMS回 200 ( OK ) 响应。 M64. 如果在步骤 M62中 , 所述注册请求中携带有 VCS地址或 VN IMS 地址， 则 HCS直接或经过 VN IMS向 VCS请求内容过滤规则， 其中该请求中 携带有用户标识， 还可能携带有 HCS地址。
其中 ,如果在步骤 M62中 ,所述注册请求中没有携带 VCS地址或 VN IMS 地址； 则分为下述三种情况描述：
如果 HCS被指示该用户漫游，但没有给出 VN IMS或 VCS地址，则 HCS 需要向 HSS获取 VN IMS或 VCS地址后， 再进行步骤 M64的操作。
如果 HCS没有被指示是否漫游， 则 HCS需要向 HSS获取是否漫游， 以 及获取漫游时 VN IMS或 VCS地址， 确认漫游后再进行步骤 M64的操作。
如果 HCS被指示没有漫游， 或在上一情况下确认没有漫游， 则根据需要 确认该用户对应的过滤规则只有 HN的内容过滤规则，没有之前漫游地的过滤 规则。
M65. VCS取出其公有内容过滤规则，并对应保存用户标识和 HCS地址； 或在 HCS对应列表中增加该用户标识。
M66. VCS向 HCS返回其公有内容过滤规则， 其中还可能携带有用户标 识和 VCS地址。
M67. HCS根据需要处理接收到的内容过滤规则并将用户标识、 VCS地 址和过滤规则对应保存在规则数据库中。 其中， 关于 HCS对接收到的过滤规 则的处理过程（可能的语法语义转换，将获取的过滤规则或转换后的过滤规则 与自身过滤规则分开存储， 以便后续过滤时分别执行，或和自身过滤规则进行 合并后存储以便用于后续过滤）类似图 3中的步骤 S18的相应部分，具体伴见 上述， 在此不再赘述。 如图 Ί所示，为基于上述图 3或图 4的处理流程将漫游用户 HN中的过滤 规则获取过来存储在 VN的基础上，后续对向漫游用户发送的内容进行过滤的 实施例处理示意图， 其中： 540. 内容源 （CR )将内容和接收用户标识直接发送到 VN (指采用目前 的第二种漫游模式）； 或者 CR将内容和接收用户标识首先发送到该用户的 HN, 然后 HN根据该用户标识查询漫游出用户记录表， 查找到该用户记录则 HN得知该用户已经漫游到外地网络，直接屏蔽 HCS对 CR发给该用户的内容 游在的 VN (指采用目前的第一种漫游模式）。
541. VN根据用户标识查询漫游出用户记录表， 没有找到， 则将 HN发来 的内容及其接收用户标识转发给 VCS ,请求 VCS对该内容进行过滤，如果 VCS 不能识别 CR带来的用户标识， 则 VN还需要根据 CR带来的用户标识找到对 应 VCS可以识别的用户标识后， 再发送给 vcs。
542. VCS根据接收到的用户标识查询漫游用户状态记录表， 找到已记录 有该漫游用户的记录且其漫游标识为漫游入，则根据该用户标识在规则数据库 中匹配该用户在漫游状态下应该遵循的所有内容过滤规则（包括用户在 HN中 收发内容应该遵循的过滤规则 , 进一步如果 VCS存在对所有收发内容进行过 滤的规则， 还包括该 VCS对所有收发内容进行过滤的规则）， 并使用匹配出的 过滤规则对该漫游用户的每次收发内容进行过滤处理； 另一方面 VCS要记录 每次执行内容过滤处理的当前时间点以作为最近执行时间。
543. VCS将过滤后的内容及其该用户标识发送给 VN (其中 VCS可以将 过滤后的内容直接反馈给发送该内容的设备，也可以反馈给 VN中的其他具有 内容发送能力的设备）。。
544. VN才 据接收用户标识确定接收方地址， 并将过滤后的内容组装成符 合要求的数据包格式， 然后发送给接收用户 （User )。
还请参阅图 8, 为基于上述图 6的处理流程中将漫游用户 VN中的过滤规 则获取过来存储在 HN的基础上，后续对向漫游用户发送的内容进行过滤的实 施例处理示意图， 其中包括步骤：
M80. CR将内容和接收用户标识直接发送到 HN (比如归属网络中的
GGSN )。
M81. HN将收到的内容和用户标识发送给 HCS, 请求 HCS对该该用户的 内容进行过滤。 M82. HCS 接收到的用户标识， 一方面在规则数据库中匹配该用户在 漫游状态下应该遵循的所有内容过滤规则，并使用匹配出的过滤规则对该漫游 用户的每次收发内容进行过滤处理； 另一方面 HCS要记录每次执行内容过滤 处理的当前时间点以作为最近执行时间。
M83. HCS将过滤后的内容及其该用户标识发送给 HN。
M84. HN才 据接收用户标识确定 VN SGSN地址，并将过滤后的内容组装 成符合要求的数据包格式 , 发送给 VN SGSN。
M85. VN将内容发送给接收用户 （ User )。 如图 9所示，为基于上述图 3或图 4的处理流程将漫游用户 HN中的过滤 规则获取过来存储在 VN的基础上，后续对已获取的过滤规则进行更新的处理 流程图， 其中在后续过程中， HCS在监测到自身对所有收发内容进行过滤的 规则 （公有规则）发生变化时， 和 /或漫游用户被设置的私有过滤规则发生变 化时， 触发过滤规则更新操作 ( S50 ); HCS 确定过滤规则的更改将影响到漫 游用户状态记录表中所有漫游标识为漫游出的用户， 则才 据相应保存的 VCS 地址向 VCS发送更改后的过滤规则， 以请求 VCS对当前保存的 HN中的过滤 规则进行更新， 该更新请求消息中携带有漫游用户标识（S51 ); VCS根据接 收到的用户标识查询规则数据库，并基于接收到的更新后的过滤规则更新规则 数据库中当前存储的 HN中的过滤规则 （S52 ); VCS向 HCS返回更新成功响 应， 如果 HCS没有收到该响应消息， 则可以在间隔一定时间后重发上述 S51 中的更新请求消息， 若 HCS在重发规定次数的更新请求消息后， 仍不能接收 到 VCS反馈的响应， 则可以考虑终止发送更新请求消息（S53 )。
类似地， 图 9中 VCS和 HCS的替换可作为基于图 6的处理流程中将漫游 用户 VN中的过滤规则获取过来存储在 HN的基础上，后续对已获取的过滤规 则进行更新的处理流程图， VCS在监测到自身对所有收发内容进行过滤的规 则 （公有规则）发生变化时， 触发过滤规则更新操作 ( S50 ); VCS根据保存 的 HCS地址向 HCS发送更改后的过滤规则， 以请求 HCS对当前保存的 VN 中的过滤规则进行更新。
如图 10所示， 为本发明获取过滤规则并进行内容过滤的第三实施例处理 过程示意图， 其中 S60〜S74的整体处理过程与上述图 4中的 S20〜S31处理过 程相似，只是 HCS在向 VCS反馈过滤规则时还要反馈与反馈的过滤规则对应 的规则标识，然后 VCS在保存 HCS发来的过滤规则时还要保存与该过滤规则 对应的规则标识， 其中过滤规则标识可以是规则 ID, 也可以是对应的规则 ID 与更新时间信息等组合成的可以唯一代表一个规则的标识。规则标识并不局限 与本实施例中的规则获取方式结合，还可以用于首次检测到该漫游用户及其它 情况时触发的规则获取方式。 同时， 和 S20〜S31 相比， 本实施例明确先执行 自身的过滤规则， 同时去获取 HCS过滤规则， 再执行获取到的或转换后的过 滤规则。
如图 11所示，为基于上述图 10的处理流程将漫游用户 HN中的过滤规则 获取过来存储在 VN的基础上 ,后续对向漫游用户发送的内容进行过滤的实施 例处理示意图， 其中：
580. CR将内容和接收用户标识直接发送到 VN (指采用目前的第二种漫 游模式）； 或者 CR将内容和接收用户标识首先发送到该用户的 HN, 然后 HN 据该用户标识查询漫游出用户记录表，查找到该用户记录则 HN得知该用户 已经漫游到外地网络， 直接屏蔽 HCS对 CR发给该用户的内容进行过滤， 而 是直接将 CR发来的内容及其该接收用户标识转发给该用户所漫游在的 VN (指采用目前的第一种漫游模式）。
581. VN根据用户标识查询漫游出用户记录表， 没有找到， 则将 HN发来 的内容及其接收用户标识转发给 VCS ,请求 VCS对该内容进行过滤，如果 VCS 不能识别 CR带来的用户标识， 则 VN还需要根据 CR带来的用户标识找到对 应 VCS可以识别的用户标识后， 再发送给 VCS。
582. VCS根据接收到的用户标识查询漫游用户状态记录表， 找到已记录 有该漫游用户的记录且其漫游标识为漫游入，说明 VCS已经从 HCS调用过来 相应的内容过滤规则。
583. VCS将存储的用户标识、 及其与已经调用的内容过滤规则对应存储 的规则标识提取出并发送给 HCS。 容进行过滤。 标识， 并比较匹配出的过滤规则标识和 VCS发来的过滤规则标识是否相同， 如果比较结果不同， 则说明 HCS中的过滤规则已进行了更新。
S86. HCS提取出更新后的过滤规则及其对应的规则标识， 然后向 VCS返 回规则更新响应，该规则更新响应中携带有用户标识、更新后的过滤规则及其 对应的规则标识； 如果上述 S85中的比较结果不同， 则 HCS向 VCS反馈规则 未发生更新响应消息； 如果 VCS没有收到该响应消息， 则可以在间隔一定时 间后重发上述 S83中的消息， 若 VCS在重发规定次数的该消息后， 仍不能接 收到 HCS反馈的响应， 则可以考虑终止发送该消息， 继续 S88及其后续步骤。
S87. VCS基于 HCS反馈的新的过滤规则及其对应的新的规则标识更新本 地的对应记录；
588. VCS根据用户标识在本地规则数据库中匹配出最新的该用户在 HN 中需要使用的内容过滤规则， 并基于匹配出的 HN过滤规则对 CR发来的内容 进行过滤； 另一方面 VCS还要记录每次执行内容过滤处理的当前时间点， 以 作为最近执行时间。
589. VCS将过滤后的内容及其该用户标识发送给 VN (其中 VCS可以将 过滤后的内容直接反馈给发送该内容的设备，也可以反馈给 VN中的其他具有 内容发送能力的设备）。
590. VN才 据接收用户标识确定接收方地址， 并将过滤后的内容组装成符 合要求的数据包格式， 然后发送给接收用户 （User )。
如图 12所述， 为 VCS删除获取到的过滤规则的第一实施例处理示意图， 其中：
5100. VCS在检测到最近一次对漫游用户收发的内容执行过滤的时间距离 现在已经超过一个规定的时间长度，则删除用户漫游状态记录表中该用户的漫 游状态记录， 该漫游状态记录中包含该用户的标识、 漫游标识、 HCS 地址、 最近执行时间，可能还有和该过滤规则对应的规则标识。 同时还要删除规则数 据库中该用户的记录， 该记录中包含该用户的标识和其对应的过滤规则。
5101. VCS通知 HCS删除用户漫游状态记录表中该用户的漫游状态记录， 该通知消息中携带有该用户标识和 VCS地址。 5102. HCS 据用户标识查询用户漫游状态记录表中该用户的漫游状态 记录： 如果漫游状态记录中的漫游标识为漫游出、 且记录的 VCS地址与接收 到的 VCS地址相同， 则删除其漫游状态记录； 如果漫游状态记录中的漫游标 识为漫游出、但记录的 VCS地址与收到的 VCS地址不同， 则说明用户已漫游 到新 VN; 如果漫游状态记录中的漫游标识为未漫游， 说明该用户已重新回到 HN。
5103. HCS向 VCS返回删除成功响应； 如果 VCS没有收到该响应消息， 则可以在间隔一定时间后重发上述 S101中的通知消息，若 VCS在重发规定次 数的该消息后， 仍不能接收到 HCS反馈的响应， 则可以考虑终止发送该通知 消息。
5104. HCS通知 HN删除漫游出用户记录表中该用户的记录， 其中该通知 消息中携带有用户标识。
5105. HN根据用户标识查询漫游出用户记录表中该用户的记录， 并将其 删除。
S106. HN向 HCS返回删除成功响应； 如果 HCS没有收到该响应消息， 则可以在间隔一定时间后重发上述 S104中的通知消息，若 HCS在重发规定次 数的该消息后， 仍不能接收到 HN反馈的响应， 则可以考虑终止发送该通知消 类似地， 将图 12中的 VCS和 HCS替换可作为基于图 6的处理流程将漫 游用户 VN中的过滤规则获取过来存储在 ΗΝ的基础上，后续对已获取的过滤 规则进行删除的处理流程图， HCS在检测到最近一次对漫游用户收发的内容 执行过滤的时间距离现在已经超过一个规定的时间长度， 或收到 H-IMS进行 注册解除后发起的解除消息，则删除规则数据库中该用户对应的 VN过滤规则 或将合并后的过滤规则恢复成仅为 ΗΝ过滤规则。 HCS通知 VCS删除其保留 的 HCS地址，该通知消息中携带有该用户标识和 HCS地址。 VCS根据用户标 识删除其记录， 或从 HCS对应的用户标识列表中删除该用户标识， 并向 HCS 返回删除成功响应。 由于图 6过滤服务器部署在 GGSN位置， 之后不需要通 知 VN删除用户记录。 如果本流程由 H-IMS发起， 则需要回复响应。 如图 13所示， 为 VCS删除获取到的过滤规则的第二实施例处理示意图， 其中：
S110. HCS在接收到 VCS发来的过滤规则获取请求消息时， 若查询该用 户漫游状态记录中的漫游标识为漫游出、 且其中记载的 VCS地址与接收到的 获取请求消息中携带的 VCS地址不一致时， 说明该用户已经从原漫游地漫游 到了新的 VN, 则 HCS触发该 VCS删除已获取到的过滤规则；
另一方面， 若 HCS收到要求过滤的内容时， 查询该用户漫游状态记录中 的漫游标识为未漫游， 则说明该用户到外地网络漫游后又重新回到了本地网 络， HCS触发 VCS删除已获取到的过滤规则；
Sill. HCS通知 VCS删除用户漫游状态记录表中该用户的漫游状态记录 和规则数据库中该用户的内容过滤规则， 其中该通知消息中包含该用户标识； 漫游状态记录中包括漫游标识、 用户标识、 HCS地址、 最近执行时间等信息， 其中漫游标识又包括漫游入、 漫游出、 未漫游。
5112. 此外， HCS通知 HN删除漫游出用户记录表中该用户的记录， 其中 该通知消息中携带有该用户标识。
5113. HN根据接收到的通知消息中携带的用户标识删除漫游出用户记录 表中该用户的记录。
5114. HN向 HCS返回删除成功响应，如果 HCS没有收到该响应消息，则 可以在间隔一定时间后重发上述 S112中的通知消息，若 HCS在重发规定次数 的该消息后，仍不能接收到 HN反馈的响应，则可以考虑终止发送该通知消息。
5115. VCS根据接收到的通知消息中携带的用户标识删除用户漫游状态记 录表中该用户的漫游状态记录和规则数据库中该用户在 HN 中的内容过滤规 则。
5116. VCS向 HCS反馈删除成功响应， 如果 HCS没有收到该响应消息， 则可以在间隔一定时间后重发上述 S111中的通知消息，若 HCS在重发规定次 数的该消息后， 仍不能接收到 VCS反馈的响应， 则可以考虑终止发送该通知 消息。
如图 14所示， 为内容过滤技术应用在 WCDMA R99系统的接口示意图， 其中内容过滤服务器（CS )既提供有电路域的 SS7地址又提供有分组域的 IP 地址。 CS和 SGSN之间的 CS-1接口采用 GTP协议（包括控制面 GTP-C, 用 户面 GTP-U )， CS和 MSC/VLR之间的 CS-2接口采用 SS7协议， CS和 HLR 之间的 CS-3接口只有信令传送， 通常采用 SS7中的 MAP协议， CS和 CS之 间的 CS-4接口采用 GTP协议 (包括控制面 GTP-C, 用户面 GTP-U )。
如图 15所示， 为本发明实施例中内容过滤技术应用在基于 IMS网络架构 的接口示意图。 CS和 CSCF之间遵循现有 ISC接口， CS和 HSS之间遵循现 有 Sh接口， CS和 IP连接接入网之间通过 CS-1接口连接， IP连接接入网的参 考点由具体网络情况确定， 可以是 WCDMA/GRPS的 GGSN、 CDMA2000的 HA等， CS和 CS之间通过 CS-4接口连接。
如图 16所示， 为内容过滤技术应用在 WCDMA R99系统的示意图， 此系 统分为四大部分： 终端（代表用户）、 接入网、 核心网和外部网络， 其中终端、 接入网和核心网构成 WCDMA R99系统。通常终端通过 Uu接口和接入网交互 , 接入网通过 Iu接口和核心网交互。核心网只标识出了主要的网络部件和接口 , 其中 MSC/VLR通过 CS-2接口和 CS交互， MSC/VLR通过 D接口和 HLR交 互， GMSC与 HLR通过 C接口进行交互， MSC/VLR与 GMSC以及 GMSC和 外部 PSTN之间使用承载在 TDM上的 SS7信令进行交互， SGSN与 HLR通过 Gr接口交互， SGSN通过 Gn接口与 GGSN交互， SGSN通过 CS-1接口与 CS 交互， GGSN通过 Gc接口与 HLR交互， GGSN与外部 Internet之间通过 Gi 接口交互， CS与 HLR通过 CS-3接口交互。 MSC/VLR和 GMSC为电路域的 主要部件， 终端通过其完成 WCDMA网络内的电路域业务交互， 或者通过其 接入到 PSTN等外部电路域业务网络。 SGSN、 GGSN为分组域的主要部件， 终端通过其完成 WCDMA网络内的分组域业务交互，或通过其接入到 Internet 其中 CS和 HLR既为电路域部件服务， 也为分组域部件服务。
基于上述的应用网络环境，这里假设 CS使用 IETF的 Common Policy (参 见 www.ietf.org网站 draft-ietf-geopriv-common-policy )来^^述内容过滤规则 , 同时使用语义映射表来进行不同过滤规则语义的匹配和转换， 使不同 CS之间 可以正确地互相识别和转换内容过滤规则。 下面举例说明。
IETF的 Common Policy使用 XML来描述，定义了有关应用数据接入控制 的授权策略框架， 明确了公共策略规则的描述方式，这个公共策略框架能够扩 展到别的应用领域。 其中 Policy就是规则集（Rule Set ), 其由很多 Rule组成， 每个 Rule 包括条件表达式 （ Conditions )、 操作 （ Actions ) 和转换 ( Transformations )三个部分。 Conditions是条件表达式的集合， 每个条件表 达式或者为 TRUE或者为 FALSE。当有内容过滤请求到达时，需要将其与 Rule Set中的每个 Rule 匹配， 其 Conditions部分的所有条件表达式均为 TRUE的 Rule 就是该请求适用的 Rule。 Actions是对内容进行具体过滤的操作行为， Transformations是对发送到用户的具体内容的修改操作。
这里使用语义映射表来进行不同过滤规则语义的匹配和转换，一个具体的 语义映射表如下表 1所示， 在 CS中可以使用数据库或简单的程序来表达该语 义映射表， 以此提供查询服务并返回匹配操作的结果信息。
表 1 :
Figure imgf000021_0001
基于上述， 假设处在中国内的内容过滤服务器 C 的内容过滤公有规则具 体如下：
<?xml version="1.0" encoding="UTF-8"?>
<ruleset xmlns="urn:ietf:params:xml:ns:common-policy">
<rule id="china0000001">
<conditions>
<any-identity/>
<content>
<id entity="XXX">
<id entity="XX"> <id entity="XXXX">
<id entity="XXXXXXX">
</content>
</conditions>
<actions>
<block/>
</actions>
<transformations/>
</rule>
</ruleset>
在上述规则集 rule set中 , 对于规则代码 rule id为 chinaOOOOOO l的规则 , 当满足下述 2个 condition时：
1 )任何用户；
2 ) 内容部分包含 XXX、 或 XX、 或 XXXX、 或 XXXXXXX;
执行的动作 （action ) 为阻止（block ), 即将内容过滤掉。
同时假设用户 A在中国内的内容过滤服务器 C上设置的私有过滤规则如 下：
<?xml version=" 1.0" encoding="UTF-8"?>
<ruleset xmlns="urn:ietf:params:xml:ns:common-policy">
<rule id="china0011253">
<conditions>
< identity/>
<id entity="bob@china.com">
</ identity>
<content>
<category entity=S3>
</content>
</conditions>
<actions> <block>
</actions>
</rule>
</ruleset>
在上述规则集 rule set中 , 对于规则代码 rule id为 china0011253的过滤规 则， 当满足下述 2个 condition时：
1 ) 身份 identity为 bob@china.com;
2 ) 内容分类为 S3;
执行动作 action为阻止 block, 即将内容过滤掉。
假设在美国内的内容过滤服务器 U的内容过滤公有规则具体如下：
<?xml version="1.0" encoding="UTF-8"?>
<ruleset xmlns="urn:ietf:params:xml:ns:common-policy">
<rule id="usa00000001">
<conditions>
<any-identity/>
<content>
<category entity=Sex2>
<category entity= Violence 1 >
</content>
</conditions>
<actions>
<block/>
</actions>
<transformations/>
</rule>
</ruleset>
在上述规则集 rule set中 , 对于规则代码 rule id为 usaOOOOOOOl的过滤规 则 , 当满足条件 conditionl )任何用户和 2 )内容分类为 Sex2或 Violentcel时， 执行动作 action为阻止 block, 即将内容过滤掉。 这样， 当中国内的用户 A漫游到美国时， 美国的内容过滤服务器 U需要 获取用户 A的归属网络内容过滤服务器 C的公有过滤规则和用户 A被设置的 私有过滤规则， 并将获取来的过滤规则和内容过滤服务器 U的公有过滤规则 进行相应处理， 具体做法如下：
1 )内容过滤服务器 U从内容过滤服务器 C处获取用户 A的公有过滤规则 和私有过滤规则；
2 )在内容过滤服务器 U的公有过滤规则上，体现用户 A在内容过滤服务 器 C的公有过滤规则和私有过滤规则， 以共同作为用户 A在美国时收发内容 的过滤规则；
由于所有的过滤规则语法描述都使用了 common policy, 所以不同过滤规 则之间的语法描述无需转换， 内容过滤服务器 U和 C就可以互相理解； 对于 内容部分包含的关键字词直接进行取用的情况， 由于内容过滤服务器 U和 C 使用了不同的分类方法，具体见上述表 1的表示， 因此需要使用该语义映射表 对分类进行转换， 根据该语义映射表 1 , 于是在中国的 S3在容过滤服务器 U 处被理解成 Sexl， 而根据 U的类级规则， Sexl的等级低于 SexO, 所以在用户 A的私有规则中仍然需要体现 Sex0。 这样经过处理后在美国的内容过滤服务 器 U处将形成如下的过滤规则：
<?xml version="1.0" encoding="UTF-8"?>
<ruleset xmlns="urn:ietf:params:xml:ns:common-policy">
<rule id="usa00000001 ">
<conditions>
<any-identity/>
<content>
<category entity=Sexl>
<category entity: Violence 1 >
</content>
</conditions>
<actions>
<block/> </actions>
<transformations/>
</rule>
<rule id="usa0123501">
<conditions>
< identity/>
<id entity="bob@china.com">
</ identity>
<content>
<category entity=SexO>
<id entity="XXX">
<id entity="XXX">
<id entity="XXXX">
<id entity="XXXXXXX">
</content>
</conditions>
<actions>
<block/>
</actions>
<transformations/>
</rule>
</ruleset>
结果为在上述的规则集 rule set中， 在原公有规则即规则代码 rule id为 usaOOOOOOOl不变的基础上，增加了 rule id为 usaO 123501的规则， 当满足下述 2个条件时：
1 ) 身份 identity为 bob@china.com;
2 ) 内容分类为 Sexl， 或内容部分包含 XXX、 或 XX、 或 XXXX、 或 XXXXXXX;
执行动作 action为阻止 block, 即将内容过滤掉。 下面列举一实施例来说明本发明方法的具体实施过程， 假设用户 A是基 于中国 WCDMA R99网络的 F地签约用户 , 其在 F地的 CS-B处设置了内容 过滤服务。 当用户 A漫游到 G地时， 其通过 G地的 WCDMA R99网络上网浏 览， 由于运营商整体策略是漫游时由拜访网络分配 IP地址上网， 故用户 A通 过 GGSN-S访问外部 Internet,这样 G地对用户 A收发的内容进行过滤的过程 具体可以如下：
获取过滤规则和内容过滤： Internet网络的某内容提供商根据用户 A的 IP 地址将用户 A请求的内容发送给 GGSN-S; GGSN-S根据用户 A的 IP地址通 过 Gn接口发送给 SGSN-S , SGSN-S根据接收到的 IP地址查找用户 A的 IMSI, 并将收到的内容和查找的 IMSI发送给 G地的内容过滤服务器 CS-S , 请求其 对内容进行过滤。
CS-S才 据接收到的 IMSI没有查询到用户 A的漫游状态记录， 则向 G地 的 VLR-S请求查询归属网络 F地的地址。 VLR-S根据该 IMSI查询其 HLR的 地址， 然后将 F地的 HLR-B地址返回给 CS-S。 CS-S向 HLR-B请求用户 A的 过滤规则， 并带有自己的地址， HLR-B将该请求转发给 F地的 CS-B。 CS-B 才艮据该用户 A的 IMSI查询其漫游状态记录，发现其漫游标识为未漫游， CS-B 将其置为漫游出， 并保存 CS-S地址。 CS-B将自身的公有过滤规则和用户 A 设置的私有过滤规则以及 CS-B地址发送给 CS-S。 CS-S在用户漫游状态记录 中添加 A, 保存 CS-B地址， 处理并保存获取过滤的过滤规则， 并将保存的过 滤规则和 IMSI进行正确关联， 并将该用户 A的漫游标识置为漫游入。 由于 CS-S和 CS-B使用同样的语法、并基于的分类等级也相同， 因此不需要进行语 法和语义的识别和转换。
如果 CS-S根据接收到的 IMSI查询到了用户 A的漫游状态记录， 且其中 的漫游标识为漫游入， 则 CS-S 据该 IMSI在用户 A的漫游状态记录中匹配 出相应的过滤规则， 包括 CS-S的公有过滤规则、 CS-B的公有过滤规则和用户 A的私有过滤规则；
CS-S基于自身的公有过滤规则和体现有 CS-B的公有过滤规则和用户 A 的私有过滤规则，对内容进行过滤， 并记录每次过滤处理的当前时间作为最近 执行时间。 CS-S将过滤后的内容和 IMSI发送给 SGSN-S。 SGSN-S根据该 IMSI 送给漫游在 G地的用户 A。
规则更新处理： 若 CS-B的公有过滤规则发生更改， 则 CS-B根据用户 A 的漫游状态记录中记录的 CS-S地址， 向 CS-S发送更改后的公有过滤规则， 请求 CS-S进行规则更新处理，其中该请求消息中携带有用户 A的 IMSI。 CS-S 根据 IMSI查询用户漫游状态记录， 发现其记录的漫游标识为漫游入， 则用接 收到的过滤规则更新原来存储的 CS-B公有过滤规则。 CS-S向 CS-B返回更新 成功响应消息。
规则删除处理： CS-S检测到当前时间距用户 A最近一次收发的内容被执 行内容过滤处理时间已超过规定的 48小时， 则 CS-S删除用户 A的漫游状态 记录中的所有记录， 包括原存储的从 CS-B侧获取到的过滤规则。 CS-S通知 CS-B删除用户 A的漫游状态记录，该通知消息中携带有用户 A的 IMSI和 CS-S 地址。 CS-B » IMSI查询用户漫游状态记录，发现其中记录的漫游标识为漫 游出且记录的 CS地址与接收到的 CS地址相同， 则删除用户 A的漫游记录。 CS-B向 CS-S返回成功删除响应消息。 如图 17所示， 为实施本发明上述实施例所构成的系统结构图及其 VCS、 HCS内部的处理结构图， 其中拜访网络内容过滤服务器（VCS ) 100, 可以获 取漫游用户归属网络对该用户收发内容进行过滤的规则，并基于获取到的过滤 规则对该漫游用户收发的内容进行过滤；归属网络内容过滤服务器（HCS )200, 根据该 VCS 100发来的获取请求， 将对该用户收发内容进行过滤的规则发送 给 VCS 100, VCS 100可能还需要将从 HCS 200中获取的过滤规则转换为自身 能够识别的语法语义，并基于转换后的过滤规则对漫游用户收发的内容进行过 滤。 此外若 VCS 100中存储有自身对所有收发内容进行过滤的规则， 还要基 于自身对收发内容进行过滤的规则对漫游用户收发的内容进行过滤；在这种情 况下 VCS 100可能需要将自身的过滤规则和从 HCS 200中获取的过滤规则进 行合并处理，再基于合并后的过滤规则对漫游用户收发的内容进行过滤。若采 用目前的第一种漫游模式， 漫游用户收发的内容还需要经过归属网络的处理， 因此在这种情况下 HCS 200就要屏蔽对这些内容进行过滤处理， 而是直接由 归属网络将这些内容发送到漫游用户所在的拜访网络进行内容过滤处理。
在 VCS 100中， 获取单元 101向漫游用户归属网络获取对该用户收发内 容进行过滤的规则； 在 HCS 200中， 请求接收单元 201用于接收漫游用户所 在拜访网络中的 VCS 100发来的获取请求， 其中该获取请求用于请求对该用 户收发内容进行过滤的规则； 过滤规则反馈单元 202 用于根据请求接收单元
201接收到的获取请求， 在自身的规则数据库 203中查询对该用户收发内容进 行过滤的规则并反馈给 VCS 100。
VCS 100中的规则数据库 102存储有获取单元 101获取到的过滤规则，此 外该规则数据库 102中可能还存储有 VCS 100 自身对收发内容进行过滤的规 则，过滤单元 103用于基于规则数据库 102中存储的过滤规则对该漫游用户收 发的内容进行过滤处理。
HCS 200中的变化规则发送单元 204， 在检测到规则数据库 203中存储的 对该用户收发内容进行过滤的规则发生变化时，将变化后的过滤规则发送给漫 游用户所在拜访网络中的 VCS 100; VCS 100中的第一规则更新单元 104， 基 化后过滤规则 , 更新规则数据库 102中存储的已获取到的过滤规则。
此外 VCS 100中的获取单元 101在获取过滤规则的同时还获取与该过滤 规则对应的规则标识，并将获取的规则标识与获取的过滤规则对应存储在规则 数据库 102中。这样后续在 VCS欲更新规则数据库 102中存储的过滤规则时， 由规则标识发送单元 105在规则数据库 102中提取出存储的规则标识并发送给 漫游用户的归属网络， 如规则标识发送单元 105可以在后续 VCS 100每次接 收到发送给漫游用户的内容或漫游用户发出的内容时，向漫游用户归属网络发 送规则标识。 HCS 200中的规则标识比较单元 205比较漫游用户所在拜访网络 中的 VCS 100发来的规则标识和规则数据库 203中对应该漫游用户存储的规 则标识是否一致；更新结果反馈单元 206在规则标识比较单元 205的比较结果 为一致时， 向漫游用户所在拜访网络中的 VCS 100反馈过滤规则未变化通知， 并在比较结果不一致时，将新的过滤规则及其对应的新的规则标识发送给漫游 用户所在拜访网络中的 VCS 100。 VCS 100中的第二规则更新单元 106根据漫 游用户归属网络在规则标识发送单元 105发送的规则标识和对应该漫游用户 存储的规则标识不一致时，发来的新的过滤规则及其对应的新的规则标识更新 规则数据库 102中存储的过滤规则及其对应的规则标识。
其中上述的两种规则更新方式，可以在具体实施过程使用其中一种或两种 同时使用， 还可以考虑使用其他的规则更新方式。
VCS 100中的第一规则删除单元 107检测到在规定时间内没有内容发送到 该漫游用户及该漫游用户没有发出内容时，则删除规则数据库 102中存储的已 获取到的过滤规则。 或者， HCS 200中的规则删除通知单元 207在检测到漫游 用户移出当前的拜访网络时， 就通知拜访网络中的 VCS 100删除已获取到的 过滤规则， 然后由 VCS 100中的第二规则删除单元 108根据漫游用户归属网 络在检测到漫游用户移出拜访网络时向拜访网络发来的规则删除通知，删除规 则数据库 102中存储的已获取到的过滤规则。 其中上述的两种规则删除方式， 可以在具体实施过程使用其中一种或两种同时使用，还可以考虑使用其他的规 则删除方式。
对于使用第一种漫游模式而言，发送给漫游在 VN中的用户的内容，还要 经过其 HN的处理，因此在这种情况下 HN中的 HCS 200中还要包括漫游判断 单元 208,在漫游用户收发的内容经过归属网络时，判断该用户是否发生漫游； 过滤屏蔽单元 209在该用户发生漫游时屏蔽对该用户收发的内容进行过滤处 理，而是由 HN将需要过滤的内容发送到漫游用户当前所在的 VN中进行过滤。
另外，本发明实施例还提供一种内容过滤服务器， 所述内容过滤服务器包 括： 规则获取单元和过滤单元。 其中， 所述规则获取单元， 用于在第二网络中 获取漫游用户所在第一网络对该用户收发内容进行过滤的规则； 所述过滤单 元， 用于根据所述过滤规则对所述漫游用户收发的内容进行过滤。
优选的， 所述内容过滤服务器至少还包括下述单元之一： 转换单元、 自身 过滤单元。 其中， 所述转换单元， 用于在第二网络中将获取单元获取的过滤规 则转换成所述过滤单元能够识别的语法语义后，并将转换后的过滤规则发送给 过滤单元； 所述自身过滤单元， 用于在第二网络中根据自身的过滤规则对所述 漫游用户收发的内容进行过滤。
也就是说， 所述内容过滤服务器可以包括单元分别下三种情况：
一种是， 包括： 规则获取单元、 过滤单元、 转换单元， 其中， 转换单元分 别与规则获取单元和过滤单元相连。
一种是， 包括： 规则获取单元、 过滤单元和自身过滤单元， 其中， 各个单 元的连接方式可以为； 过滤单元和自身过滤单元分别与规则获取单元相连，也 可以是过滤单元分别与规则获取单元和自身过滤单元相连，也可以是自身过滤 单元分别与规则获取单元和过滤单元相连。
一种是， 包括： 规则获取单元、 过滤单元、 转换单元和自身过滤单元。 其 中，各单元的具体的连接方式可以是： 转换单元分别与规则获取单元和过滤单 元相连， 自身过滤单元再与过滤单元相连； 也可以是转换单元分别与规则获取 单元和过滤单元相连， 自身过滤单元再与获取单元相连。
优选的，所述内容过滤服务器再上述公开的基础上还可以包括：组合单元， 用于将规则获取单元获取的过滤规则或接收到转换单元转换后的过滤规则至 少之一与第二网络自身的过滤规则进行合并，并将所述合并后的过滤规则发送 给过滤单元。 在该优选方案中， 可以仅包括规则获取单元和组合单元相连， 也 可以包括规则获取单元、 转换单元、 组合单元和过滤单元依次相连， 还可以在 上述情况的基础上分别增加组合单元。
优选的， 所述内容过滤服务器至少还包括下述单元之一： 第一规则更新单 元和第一规则删除单元。 其中， 所述第一规则更新单元， 用于根据漫游用户所 滤规则对已获取的过滤规则进行更新。所述第一规则删除单元， 用于第二网络 检测到在规定时间内漫游用户没有内容收发时， 删除已获取到的过滤规则。
需要说明的是， 上述第一网络为归属网络时， 第二网络为拜访网络； 或者 第一网络为拜访网络时， 第二网络为归属网络。
优选的， 当所述内容过滤服务器服务于拜访网络时， 所述规则获取单元包 括： 第一规则获取子单元， 进一步还可以包括： 规则标识获取子单元、 规则标 识发送单元和第二规则更新单元。 其中， 所述第一规则获取子单元， 用于在拜 访网络中首次检测到该漫游用户或首次接收到漫游用户收发的内容时，获取漫 游用户所在归属网络中对该用户收发内容进行过滤的规则。所述规则标识获取 子单元， 用于在获取过滤规则时， 获取与该过滤规则对应的规则标识。 所述规 则标识发送单元， 用于将所述规则标识发送给漫游用户的归属网络； 所述第二 规则更新单元，用于根据漫游用户归属网络在规则标识发送单元发送的规则标 识和对应该漫游用户存储的规则标识不一致时，根据发来新的过滤规则及对应 的新的规则标识更新已存储的过滤规则及对应的规则标识。
优选的， 当所述内容过滤服务器服务于拜访网络时， 所述内容过滤服务器 还包括： 第二规则删除单元， 用于在接收到归属网络检测到漫游用户移出拜访 网络时发来的规则删除通知时， 删除已获取的过滤规则。
优选的， 当所述内容过滤服务器服务于归属网络时， 所述获取单元包括： 第二规则获取子单元，用于在所述归属网络检测到所述漫游用户首次注册 优选的， 当所述内容过滤服务器服务于归属网络时， 所述内容过滤服务器 还包括：
第三规则删除单元， 用于归属网络检测到漫游用户的注册解除时，删除已 获取的过滤规则。
所述内容过滤服务器中各个单元的功能和作用的实现过程详见上述方法 中对应步骤的实现过程， 在此不再赞述。
综上所述， 本发明实施例较之现有技术， 因为拜访网络 /归属网络取用归 属网络 /拜访网络的内容过滤规则， 因此当用户漫游在拜访网络时， 可以避免 在第一种漫游模式下， 内容需要在归属网络和拜访网络分别进行过滤处理，从 而缩短了过滤处理时间， 减小了用户的等待内容时间， 因此改善了用户的使用 感受。 并且本发明实施例可以兼容第二种漫游模式，这样可以避免内容在归属 网络和拜访网络之间的传输，因此不会受到中间传输故障或者另一方内容过滤 提供商故障的影响，有利于内容过滤服务的正常执行。此外本发明实施例可以 兼容第一种漫游模式， 符合 IMS的归属域控制思想。
需要说明的是，本领域普通技术人员可以理解， 实现上述实施例方法中的 全部或部分步骤是可以通过程序来指令相关的硬件来完成，所述的程序可以存 储于计算机可读取存储介质中， 该程序在执行时， 包括上述方法中的步骤， 所 述步骤的内容具体详见上述， 在此不再赘述， 所述的存储介质可以为：
ROM/RAM, 磁碟和光盘等。 明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及 其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种对漫游用户的通信内容进行过滤的方法， 其特征在于， 包括： 漫游用户所在第二网络获取漫游用户所在第一网络对该用户收发内容进 行过滤的规则；
根据所述过滤规则对所述漫游用户收发的内容进行过滤。
2、 如权利要求 1所述的方法， 其特征在于， 所述方法至少还包括下述步 骤之一：
所述第二网络将获取的过滤规则转换为自身能够识别的语法语义后，并根 据所述转换后的过滤规则对漫游用户收发的内容进行过滤；
漫游用户所在第二网络根据自身的过滤规则对所述漫游用户收发的内容 进行过滤。
3、 如权利要求 2所述的方法， 其特征在于， 所述漫游用户所在第二网络 将获取的过滤规则和转换后的过滤规则至少之一与第二网络自身的过滤规则 进行合并， 根据所述合并后的过滤规则对漫游用户收发的内容进行过滤。
4、 如权利要求 1所述的方法， 其特征在于， 所述方法还包括：
所述第一网络在对用户收发内容进行过滤的规则发生变化时，将变化后的 过滤规则发送给第二网络；
所述第二网络根据接收到的变化后的过滤规则对已获取的过滤规则进行 更新。
5、 如权利要求 1所述的方法， 其特征在于， 所述方法还包括：
所述第二网络检测到在规定时间内所述漫游用户没有内容收发时，删除已 获取到的过滤规则。
6、 如权利要求 1至 5任一项所述的方法， 其特征在于， 所述第一网络为 归属网络， 第二网络为拜访网络； 或者第一网络为拜访网络， 第二网络为归属 网络。
7、 如权利要求 1所述的方法， 其特征在于， 当所述第二网络为拜访网络， 第一网络为归属网络时 ,所述获取漫游用户所在第一网络对该用户收发内容进 行过滤的规则的过程为：
所述拜访网络在首次检测到该漫游用户或首次接收到漫游用户收发的内 容时， 获取漫游用户所在归属网络对该用户收发内容进行过滤的规则。
8、 如权利要求 7所述的方法， 其特征在于， 所述方法还包括：
所述拜访网络在首次获取过滤规则时， 获取与该过滤规则对应的规则标 识； 以及
将获取的过滤规则和对应的规则标识进行对应存储。
9、 如权利要求 8所述的方法， 其特征在于， 当所述拜访网络在准备对已 获取的过滤规则更新时， 将对应的规则标识发送给漫游用户归属网络；
若所述归属网络判断接收到的规则标识和对应该漫游用户存储的规则标 识不一致时，将对应该漫游用户的新的过滤规则及其对应的新的规则标识发送 给拜访网络；
所述拜访网络根据接收到新的过滤规则和对应的规则标识更新已存储的 过滤规则及其对应的规则标识。
10、 如权利要求 9所述的方法， 其特征在于， 若所述归属网络判断所接收 到的规则标识和对应该漫游用户存储的规则标识一致时，向拜访网络发送过滤 规则未更新的通知。
11、 如权利要求 9所述的方法， 其特征在于， 所述拜访网络在后续接收到 漫游用户收发的内容时， 准备对已获取的过滤规则更新。
12、如权利要求 1所述的方法，其特征在于， 当所述第二网络为拜访网络， 第一网络为归属网络时， 所述方法还包括：
所述漫游用户的归属网络在检测到所述漫游用户移出所述拜访网络时，通 知拜访网络删除已获取到的过滤规则；
所述拜访网络接收到所述通知时， 删除已获取到的过滤规则。
13、如权利要求 1所述的方法，其特征在于， 当所述第二网络为拜访网络， 第一网络为归属网络时 , 所述漫游用户收发的内容经过该用户的归属网络时 , 该用户的归属网络判断该用户是否发生漫游； 以及
在判断出该用户发生漫游时， 屏蔽对该用户收发的内容进行过滤。
14、 如权利要求 1所述的方法， 其特征在于， 漫游用户归属网络自身对该 用户收发的内容进行过滤的规则为：
所述归属网络对所有收发的内容进行过滤的规则； 或 所述归属网络对所有收发的内容进行过滤的规则和内容过滤订阅者为该 用户设置的过滤规则。
15、如权利要求 1所述的方法，其特征在于， 当所述第二网络为归属网络， 第一网络为拜访网络时，所述获取漫游用户所在第一网络对该用户收发内容进 行过滤的规则的过程为：
所述归属网络检测到所述漫游用户首次注册成功时 ,到所述漫游用户的拜 访网络获取过滤规则。
16、 如权利要求 15所述的方法， 其特征在于， 当所述归属网络检测到该 漫游用户注册解除时， 删除已获取到的过滤规则。
17、 如权利要求 1所述的方法， 其特征在于， 漫游用户拜访网络自身对该 用户收发的内容进行过滤的规则为：
所述拜访网络对所有收发的内容进行过滤的规则。
18、 一种内容过滤服务器， 其特征在于， 包括：
规则获取单元，用于在第二网络中获取漫游用户所在第一网络对该用户收 发内容进行过滤的规则；
过滤单元， 用于根据所述过滤规则对所述漫游用户收发的内容进行过滤。
19、 根据权利要求 18所述的内容过滤服务器， 其特征在于， 所述内容过 滤服务器至少还包括下述单元之一：
转换单元，用于在第二网络中将获取单元获取的过滤规则转换成所述过滤 单元能够识别的语法语义后， 并将转换后的过滤规则发送给过滤单元；
自身过滤单元，用于在第二网络中根据自身的过滤规则对所述漫游用户收 发的内容进行过滤。
20、根据权利要求 18或 19所述的内容过滤服务器， 其特征在于， 所述内 容过滤服务器还包括：
组合单元 ,用于将规则获取单元获取的过滤规则或接收到转换单元转换后 的过滤规则至少之一与第二网络自身的过滤规则进行合并，并将所述合并后的 过滤规则发送给过滤单元。
21、 根据权利要求 18所述的内容过滤服务器， 其特征在于， 所述内容过 滤服务器至少还包括下述单元之一： 第一规则更新单元，用于根据漫游用户所在第一网络在对用户收发内容进 更新；
第一规则删除单元，用于第二网络检测到在规定时间内漫游用户没有内容 收发时， 删除已获取到的过滤规则。
22、如权利要求 18、 19或 21任一项所述的内容过滤服务器，其特征在于， 所述第一网络为归属网络， 第二网络为拜访网络； 或者第一网络为拜访网络， 第二网络为归属网络。
23、 如权利要求 20所述的内容过滤服务器， 其特征在于， 所述第一网络 为归属网络， 第二网络为拜访网络； 或者第一网络为拜访网络， 第二网络为归 属网络。
24、 根据权利要求 18所述的内容过滤服务器， 其特征在于， 当所述内容 过滤服务器服务于拜访网络时 , 所述规则获取单元包括：
第一规则获取子单元，用于在拜访网络中首次检测到该漫游用户或首次接 收到漫游用户收发的内容时，获取漫游用户所在归属网络中对该用户收发内容 进行过滤的规则。
25、 根据权利要求 24所述的内容过滤服务器， 其特征在于， 所述规则获 取单元还包括：
规则标识获取子单元， 用于在获取过滤规则时， 获取与该过滤规则对应的 规则标识。
26、 根据权利要求 25所述的内容过滤服务器， 其特征在于， 所述内容过 滤服务器还包括：
规则标识发送单元 , 用于将所述规则标识发送给漫游用户的归属网络； 第二规则更新单元，用于根据漫游用户归属网络在规则标识发送单元发送 的规则标识和对应该漫游用户存储的规则标识不一致时，根据发来新的过滤规 则及对应的新的规则标识更新已存储的过滤规则及对应的规则标识。
27、 根据权利要求 18所述的内容过滤服务器， 其特征在于， 当所述内容 过滤服务器服务于拜访网络时， 所述内容过滤服务器还包括：
第二规则删除单元，用于在接收到归属网络检测到漫游用户移出拜访网络 时发来的规则删除通知时， 删除已获取的过滤规则。
28、 根据权利要求 18所述的内容过滤服务器， 其特征在于， 当所述内容 过滤服务器服务于归属网络时， 所述获取单元包括：
第二规则获取子单元，用于在所述归属网络检测到所述漫游用户首次注册
29、 根据权利要求 28所述的内容过滤服务器， 其特征在于， 所述内容过 滤服务器还包括：
第三规则删除单元， 用于归属网络检测到漫游用户的注册解除时，删除已 获取的过滤规则。
30、 一种对漫游用户的通信内容进行过滤的系统， 其特征在于， 包括： 拜访网络内容过滤服务器，用于获取漫游用户归属网络对该用户收发内容 进行过滤的规则，并基于获取到的过滤规则对所述漫游用户收发的内容进行过 滤；
归属网络内容过滤服务器 ,用于根据所述拜访网络内容过滤服务器发来的 获取请求，将对所述用户收发内容进行过滤的规则发送给拜访网络内容过滤服 务器。
31、 如权利要求 30所述的系统， 其特征在于， 所述拜访网络内容过滤服 务器还基于自身对收发内容进行过滤的规则对所述漫游用户收发的内容进行 过滤。
32、 如权利要求 30所述的系统， 其特征在于， 所述拜访网络内容过滤服 务器将获取的过滤规则转换为自身能够识别的语法语义后，基于转换的过滤规 则对漫游用户收发的内容进行过滤。
33、 如权利要求 32所述的系统， 其特征在于， 所述拜访网络内容过滤服 务器将自身的过滤规则和获取的过滤规则进行合并后，基于合并的过滤规则对 漫游用户收发的内容进行过滤。
34、 一种拜访网络内容过滤服务器， 其特征在于， 包括：
获取单元，用于向漫游用户归属网络获取对该用户收发内容进行过滤的规 则；
规则数据库 , 用于存储有所述获取单元获取到的过滤规则； 过滤单元，用于基于规则数据库中存储的过滤规则对所述漫游用户收发的 内容进行过滤。
35、 如权利要求 34所述的服务器， 其特征在于， 所述规则数据库中还存
36、 如权利要求 34所述的服务器， 其特征在于， 还包括第一规则更新单 元，用于基于漫游用户归属网络在对用户收发内容进行过滤的规则发生变化时 发来的变化后过滤规则， 更新规则数据库中存储的已获取到的过滤规则。
37、 如权利要求 34所述的服务器， 其特征在于， 所述获取单元在获取过 滤规则的同时还获取与该过滤规则对应的规则标识；
所述规则数据库中还存储有与获取的过滤规则对应的规则标识。
38、 如权利要求 37所述的服务器， 其特征在于， 还包括：
规则标识发送单元，用于在规则数据库中提取存储的规则标识并发送给漫 游用户的归属网络；
第二规则更新单元，用于根据漫游用户归属网络在规则标识发送单元发送 的规则标识和对应该漫游用户存储的规则标识不一致时，发来的新的过滤规则 标识。
39、 如权利要求 38所述的服务器， 其特征在于， 所述规则标识发送单元 在后续拜访网络内容过滤服务器每次接收到发送给漫游用户的内容或漫游用 户发出的内容时， 向漫游用户归属网络发送规则标识。
40、 如权利要求 34所述的服务器， 其特征在于， 所述服务器还包括第一 规则删除单元，用于检测到在规定时间内没有内容发送到该漫游用户及该漫游 用户没有发出内容时， 删除规则数据库中存储的已获取到的过滤规则。
41、 如权利要求 34所述的服务器， 其特征在于， 还包括第二规则删除单 元，用于才 据漫游用户归属网络在检测到所述漫游用户移出拜访网络时向拜访 网络发来的规则删除通知 , 删除规则数据库中存储的已获取到的过滤规则。
42、 一种归属网络内容过滤服务器， 其特征在于， 包括：
请求接收单元 ,用于接收漫游用户所在拜访网络中的拜访网络内容过滤服 务器发来的获取请求，所述获取请求用于请求对该用户收发内容进行过滤的规 则；
过滤规则反馈单元， 用于根据请求接收单元接收到的获取请求， 查询对该 用户收发内容进行过滤的规则并反馈给拜访网络内容过滤服务器。
43、 如权利要求 42所述的服务器， 其特征在于， 还包括：
变化规则发送单元， 用于在对用户收发内容进行过滤的规则发生变化时， 将变化后的过滤规则发送给漫游用户所在拜访网络中的拜访网络内容过滤服 务器。
44、 如权利要求 42所述的服务器， 其特征在于， 所述服务器还包括： 规则标识比较单元，用于比较漫游用户所在拜访网络中的拜访网络内容过 滤服务器发来的规则标识和对应该漫游用户存储的规则标识是否一致；
更新结果反馈单元， 用于在规则标识比较单元的比较结果为一致时， 向漫 游用户所在拜访网络中的拜访网络内容过滤服务器反馈过滤规则未变化通知； 并在比较结果不一致时，将新的过滤规则及其对应的新的规则标识发送给漫游 用户所在拜访网络中的拜访网络内容过滤服务器。
45、 如权利要求 42所述的服务器， 其特征在于， 所述服务器还包括规则 删除通知单元， 用于在检测到漫游用户移出所述拜访网络时，通知拜访网络中 的拜访网络内容过滤服务器删除已获取到的过滤规则。
46、 如权利要求 42所述的服务器， 其特征在于， 还包括：
漫游判断单元， 用于在漫游用户收发的内容经过归属网络时， 判断该用户 是否发生漫游；
过滤屏蔽单元，用于在该用户发生漫游时屏蔽对该用户收发的内容进行过 滤。
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