WO2008000123A1 - Système, dispositif et procédé pour gérer une défaillance d'un noeud de commutation mobile - Google Patents

Système, dispositif et procédé pour gérer une défaillance d'un noeud de commutation mobile Download PDF

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Publication number
WO2008000123A1
WO2008000123A1 PCT/CN2007/000275 CN2007000275W WO2008000123A1 WO 2008000123 A1 WO2008000123 A1 WO 2008000123A1 CN 2007000275 W CN2007000275 W CN 2007000275W WO 2008000123 A1 WO2008000123 A1 WO 2008000123A1
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WO
WIPO (PCT)
Prior art keywords
mobile switching
switching center
called
information
user
Prior art date
Application number
PCT/CN2007/000275
Other languages
English (en)
French (fr)
Inventor
Wenyu Liu
Fang You
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 CN200780000307XA priority Critical patent/CN101317470B/zh
Publication of WO2008000123A1 publication Critical patent/WO2008000123A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/30—Network data restoration; Network data reliability; Network data fault tolerance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a communication system, apparatus, and method for responding to a fault of a mobile switching node.
  • Iu-Flex technology is a circuit domain disaster recovery mechanism proposed by 3GPP in Release 5, which defines the concept of "pool".
  • the pool includes multiple radio network controllers (Radio Network Controller).
  • RNC Radio Network Controller
  • BSC Base Station Controller
  • CN Core Network
  • the Iu-Flex mechanism ensures that when a user roams in an area managed by the RNC in the pool, all core network processing processes are specific to a CN node in the pool.
  • the above is performed, that is, for a single user, there is only one home CN processing node in the pool, so that there is no concept of CN load sharing, and frequent location update can be avoided.
  • For all users in the pool they are divided into different home CN nodes, so they are load-sharing. The division of the home CN nodes in the user pool should be determined by the RNC when the user first registers in the pool.
  • the RNC adjusts the user belonging to the CN node to other CN nodes through a specific algorithm.
  • A-Flex a mechanism similar to Iu-Flex can also be deployed, called A-Flex, that is, a BSC in a CDMA2000 network can connect multiple MSC/VLRs (Mobile Switching Center/Visit Location Register, mobile switching). Center/visit location register), class
  • MSC/VLRs Mobile Switching Center/Visit Location Register, mobile switching). Center/visit location register
  • the A-Flex area described in this specification is a collection of at least one BSC (often multiple) and at least two MSC/VLRs serving it at the same time, each BSC and the area. All MSC/VLRs are connected.
  • Figure 1 shows a prior art location registration flow chart, which is explained below.
  • the BSC sends a location registration request message to the MSC1/VLR1 to perform location registration; the MSC1/VLR1 finds that the MSC/VLR where the user is located changes, and sends a registration notification request (REGNOT) request to the HLR, which carries the user location information; the HLR returns to the registration. Notification response (regnot response) to MSC1/VLR1; MSC1/VLR1 returns a Location Update Accept message with updated location information to the BSC.
  • REGNOT registration notification request
  • the length of this period may be the time of registration with the next period position or other operations that may trigger location registration, such as the network side initiates a mandatory location registration request, the user moves to a new location area and automatically initiates location registration, etc. The moment of coming is related.
  • the original implicit location registration mechanism of the CDMA2000 core network can guarantee the redirection problem of the initial call under the A-Flex architecture.
  • the original MSC/VLR cannot handle the service.
  • the redirection problem of the user's called service is the reason that the original MSC/VLR cannot handle the service.
  • the embodiment of the present invention provides a system, device, and method for responding to a fault of a mobile switching center, so as to prevent the MSC/VLR from being suddenly unable to process signaling in the network, the user cannot perform the called service before re-registering the location, so that After the original MSC/VLR is down, the user can be redirected to other MSC/VLRs to correctly perform the called service on the new MSC/VLR.
  • a method for coping with a mobile switching node failure in a system comprising at least one base station controller, at least two mobile switching centers, and at least one home location register, the steps comprising: the home location register learning the first mobile exchange Central failure
  • the called service request makes a request to the home location register to obtain location information for the called user, wherein the called user is registered at the first mobile switching center, and the home location register is the called service requester. Selecting a second mobile switching center and requesting location information from the second mobile switching center;
  • the second mobile switching center returns the location information to the home location register; the home location register returns the location information to the called service requester; and the called service requester is based on the location Information for subsequent business.
  • a system for responding to a failure of a mobile switching node comprising at least two mobile switching centers connected to a home location register;
  • the home location register is configured to learn that the first mobile switching center in the at least two mobile switching centers is faulty; and receive a request from the called service requesting party to obtain location information of the called user equipment, where the called party is called
  • the service requester selects the second mobile switching center and requests the location information from the second mobile switching center, receives the location information returned by the second mobile switching center, and sends the location information to the called service requester.
  • a device for responding to a failure of a mobile switching node comprising a service processing module, the device further comprising a detection module and a selection module;
  • the detecting module is configured to detect a state of the connected mobile switching center, and determine that a mobile switching center is unreachable, and record the unreachable information of the mobile switching center;
  • the service processing module is configured to notify the selection module to perform reselection after determining that the mobile switching center needs to take the location information of the called user; and according to the selection information returned by the selection module, the another non-faulty The mobile switching center interacts;
  • the selecting module is configured to select another non-faulty mobile switching center from all mobile switching centers connected to the detecting module according to the received notification, and notify the selected mobile switching center to the service processing module.
  • a system, device, and method for responding to a failure of a mobile switching center provided by an embodiment of the present invention.
  • the original MSC/VLR fails, the original location is registered on the original MSC/VLR and there is no relocation.
  • the home location register selects another MSC/VLR to perform the called service processing, so that the users registered in the original MSC/VLR can correctly perform the called service after the original MSC/VLR failure, and the user is improved.
  • the network circuit domain disaster recovery solution enhances the stability of the system.
  • FIG. 3 is a schematic diagram of an HLR obtaining paging area information of a user according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of obtaining information of an MSC/VLR mutual assistance node by an HLR according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of an early paging procedure for using a paging area information of a called terminal call according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a called terminal call flow carrying a called service processing flag and using paging area information according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a whole network early paging process according to an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart of a called short message service according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of sending a short message on a service channel according to an embodiment of the present invention
  • FIG. 11 is a schematic flowchart of sending a short message on a control channel according to an embodiment of the present invention
  • the home location register finds that the first mobile switching center is inoperable
  • the called service request sends the location information register to the called user to obtain the location information request, where the called user is registered in the The first mobile switching center
  • the home location register selects the second mobile switching center in the same A-Flex area, and requests the location information to return to the called service requestor to perform the called service.
  • the second mobile switching center searches for the called user in the area if the paging area information can be obtained when searching for the called user; otherwise, it is within the range of all the base station controllers under the jurisdiction of the second mobile switching center. Search.
  • an embodiment of the present invention provides a method for responding to a failure of a mobile switching center, which is used for a packet.
  • a mobile switching center which is used for a packet.
  • the base station controller is connected to the mobile switching center, and the method flowchart is as shown in FIG. 2, which includes the following steps.
  • HLR learned that the first mobile switching center MSC1/VLR1 is faulty.
  • the HLR detects that the destination signaling point is unreachable or reports the fault information according to information reported from other channels, for example, by an operation and maintenance management entity through a management interface, or by the AC ( The Authentication Center (authentication center) is reported to the HLR, thereby judging that the original MSC1/VLR1 has failed so that it cannot work.
  • the called service request makes a request to the HLR to obtain the required location information for the called user, wherein the called user is registered at MSC1/VLR1, and the HLR selects MSC2/VLR2 for the requesting party and requests the location from the second mobile switching center. information.
  • the location information is a temporary local subscriber number of the called subscriber or an identifier of the mobile switching center serving the called subscriber for routing the service to the called office.
  • the second mobile switching center returns location information to the HLR.
  • the returned location information is delivered via a Mobile Application Part (MAP) message.
  • MAP Mobile Application Part
  • the MAP message can be an extension of an existing message.
  • the HLR returns the location information to the requesting party.
  • the requesting party performs subsequent services according to the location information.
  • the requested location information is a Temporary Local Directory Number (TLDN); if it is a called short message flow, the requested location information is a short message address (SMS Address),
  • the service requester sends the message with this information; if it is the called call flow, it sends the initial address message (IAM) message, if it is the called short message, it sends the SMSDPP whiteout.
  • IAM initial address message
  • the MSC in the embodiment of the present invention may have a VLR function. Therefore, the cause of the failure of the MSC in the embodiment of the present invention may be that the VLR is faulty, and the method of the embodiment of the present invention is also applicable to the The situation, and the description of the MSC may be only described in the context of the present invention, but those skilled in the art will clearly understand the situation when the VLR fails.
  • the HLR selects one with the MSC1/VLR1 according to a policy, such as local configuration information or its mutual assistance mobile switching center information obtained from the MSC1/VLR1.
  • the second MSC/VLR (such as MSC2/VLR2) in the A-Flex area requests location information for the called user. If the paging area information of the called user is stored in the HLR, the HLR may request the routing request in the mobile application part (MAP ROUTREQ).
  • the message or short message request (MAP SMSREQ) message carries the paging area information of the called user stored in the HLR to help the MSC2/VLR2 narrow down the range of finding the user; otherwise, the MSC2 will connect all of the connections in the MSC2/VLR2 when the user needs to be found. Looking for users within the BSC range.
  • the above-mentioned mutual-assisted mobile switching center refers to a mobile switching center that can replace the mobile switching center in the case of a failure of the mobile switching center, and the mutual-reciprocal mobile switching centers should belong to the same A-Flex area.
  • the search process is represented as paging. Paging within the range of all BSCs connected to the MSC/VLR is also referred to as full network paging.
  • the search process is performed by the MSC/VLR transmitting a Registration Request message to the connected part or all BSCs.
  • the process of the second mobile switching center paging the user may occur when a ROUTREQ request is received (early paging situation) or after receiving an incoming message from the called service requester (normal paging situation).
  • the latter part of the embodiment focuses on the case of normal paging. Some embodiments focus on the case of early paging, but it should be understood that the method of the present invention is applicable to both paging situations, and those skilled in the art clearly understand that early searching The implementation of the call and normal paging situation.
  • the mobile switching center incorrectly receives the request message for the location information of the user who is not registered in the local office.
  • the embodiment of the present invention may optionally carry one location information when the location information is taken by the HLR to the second mobile switching center in step A2. It indicates that the office needs to process the flag of the subsequent called service. In this way, the MSC2/VLR2 is required to return the location information to the user who is not registered in the local office, otherwise the direct processing is performed according to the existing process.
  • the HLR used may have the function of storing paging area information of the called user, or may not have the function of storing the paging area information.
  • the paging area location information includes a BSCID (BSC ID, Base Station Controller Identity) or an LAC (Location Area Code) for determining the location or range of the paging user.
  • BSCID Base Station Controller Identity
  • LAC Location Area Code
  • the HLR can also be brought to the called service requester in the locreq message (called called terminal call) or the smsreq message (called short message), and the called service requester is in the incoming message, the IAM message (called called terminal call) Or the SMSDPP message (called short message) is brought to the second mobile switching center.
  • the method of the embodiment of the present invention further includes the step of the MSC notifying the HLR of the paging area information of the user, where the HLR saves the paging area information, including: Bl, the mobile switching center discovers that the paging area information of the user is changed,
  • the HLR sends a location update message carrying the location information of the user; B2, the HLR updates and saves the paging area information of the corresponding user.
  • the MSC in step B1 reports the location information of the user to the HLR in the mobile application part location registration request (MAP REGNOT) message.
  • MAP REGNOT mobile application part location registration request
  • the BSC sends a location registration request message to the MSC1/VLR1, and the location update request carries the location registration, where the paging area information of the user is carried;
  • the MSC1/VLR1 sends a REGNOT request to the HLRJ ⁇ , where the paging area information of the user is carried, and the request message carrying the paging area information of the user is described. It can be an extension of an existing message that can carry paging area information.
  • HLR update saves the user's paging area information, returns regnot response to MSC1/VLR1; ld, MSC1/VLR1 returns location information to BSC updated Location Update Accept
  • the method by which the HLR selects another available MSC/VLR is as shown in Fig. 4, and is specifically described below.
  • the HLR locally configures the A-Flex area of each MSC, for example, MSC1 is configured on the HLR.
  • MSC2 MSC3 belong to A-Flex area 1
  • MSC4, MSC5, MSC6 belong to A-Flex area 2, then select A-Flex area 1 when it finds that MSCl is faulty and needs to perform called service for the user registered on MSCl.
  • An available MSC such as MSC2 (ie, MSC2 is a mutual-assisted MSC node of MSC1); if MSC5 fails and needs to be called for the user registered on MSC5, The available MSC in A-Flex Area 2, such as MSC4 (ie MSC4 is the mutual MSC node of MSC5).
  • the serving MSC (the MSC currently serving the user is called the serving MSC) according to the local configuration, for example, the MSC2 is configured with the MSC2 as the mutual MSC in the same A-Flex area, and the location is registered.
  • the message may optionally carry the mutual-assisted MSC after the failure of the MSC, and the HLR saves the mutual-assisted MSC information, and selects the saved mutual-assisted MSC to perform the called service service after the service MSC fails.
  • the mutual-assisted MSC information sent by the MSC to the HLR ⁇ is not necessarily included in each location registration message. Possible implementations include that after the MSC sends the mutual-assisted node information to the HLR, it is only once again after the information of the mutual-assisted node changes.
  • the location registration message contains a notification HLR.
  • the information of the mutual-assisted node in the REGNOT message can be carried by extending the existing parameters, or can be carried by adding parameters.
  • the serving MSC may also carry the MAP message for reporting the mutual-assisted node information in the other MAP message, and carry the information of the mutual-assisted node, such as using the timed report, or reporting the local configuration immediately, or combining the two. the way.
  • the serving MSC after the HLR actively initiates a new MAP message to the serving MSC, such as a mutual help node request message, the serving MSC returns the mutual node information in the response message.
  • the HLRJ request can also be scheduled.
  • the present invention does not limit the specific implementation of the HLR to obtain its mutual help node from the first mobile switching center.
  • the MSC2/VLR2 After receiving the temporary local user number from the incoming initial address message, the MSC2/VLR2 pages the user according to the paging area location information obtained from the ROUTREQ request, and after the paging response comes up, performs the normal called flow connection, as attached As shown in FIG. 5, it includes a flow description as follows.
  • the paging area information is saved in the HLR, and the paging area information is brought to the second mobile switching center by using a MAP message.
  • the MAP message is a route request message or other newly defined MAP message. It should be understood that the MAP message is capable of carrying the paging area information.
  • GMSC Global Mobile Switching Center
  • HLR Home Location Register
  • MDN number Mobile Directory Number
  • MSC2/VLR2 receives the ROUTREQ request, assigns the temporary local user number TLDN ( Temporary Local Directory Number) to the user, and returns it to the HLR in the message routreq;
  • the HLR sends a mobile application partial location request response message locreq to the GMSC, carrying the temporary local subscriber number TLDN;
  • the GMSC sends an IAM to the MSC2/VLR2 that allocates the temporary local subscriber number to the called subscriber.
  • MSC2/VLR2 after receiving the TLDN, MSC2/VLR2 will find a suitable BSC/BSCs to initiate paging Paging Request according to the paging area location information obtained in the ROUTREQ request;
  • the BSC sends a paging response Paging Response to MSC2/VLR2;
  • MSC2/VLR2 finds no user data, requests authentication from HLRJ ⁇ AUTHREQ;
  • the HLR returns an authreq response to the MSC2/VLR2, indicating that the authentication is passed; 2j, MSC2/VLR2 sends a location registration message to the HLR ⁇ REGNOT;
  • the HLR returns a regnot message, and brings back user data
  • the MSC2/VLR2 initiates an assignment request Assignment Request message, requesting the BSC to allocate an air interface channel for the user;
  • BSC returns the assignment completion message Assignment Complete message
  • the above process is the normal callee connection process of the user in the embodiment of the present invention. It should be noted that if the authentication request fails in step 2h, the called service fails; and the above-mentioned procedures for starting, terminating, and the like with respect to the BSC, the MSC/VLR, the HLR, and the user are all in the field. It is well known to the skilled person and therefore will not be described again.
  • the implementation process of the method may also be that the called service requester obtains paging area information from the HLR, and brings the paging area information to the second mobile switching center in the incoming initial address message; wherein, the HLR is in the mobile application part message. The paging area information saved by it is brought to the called service requester. In this case, the corresponding steps of 2b ⁇ 2f in the specific process are:
  • the MSC1/VLR1 registered by the called user has selected another MSC2/VLR2 according to the policy, and sends a ROUTREQ request to MSC2/VLR2; the message does not carry the paging area location information of the user;
  • MSC2/VLR2 receives the ROUTREQ request, assigns the temporary local user number TLDN to the user, and returns it to the HLR in the message routreq;
  • the HLR sends a mobile application partial location request response message locreq to the GMSC, which carries the paging area location information and the temporary local subscriber number TLDN of the user saved in the HLR;
  • GMSC sends an IAM message to the MSC2/VLR2 that assigns the roaming number to the called user, where the paging area information of the user and the called TLDN are carried;
  • the MSC2/VLR2 After receiving the location information of the paging area of the user and the called TLDN, the MSC2/VLR2 will find a suitable BSC BSCs to initiate a paging Paging Request according to the location information of the paging area.
  • the method of the embodiment of the present invention records the location information of the paging area of the user by the HLR.
  • the second MSC for replacing the original MSC may be determined according to the policy, and the called service is performed for the user originally registered in the original MSC.
  • the process of saving and updating the paging area information of the user in the HLR by the method of the embodiment of the present invention can help the second MSC to narrow down the range of finding the user to a location area or a BSC.
  • the HLR is able to determine the user's location.
  • step A3 before returning the location information to the HLR, the second mobile switching center pages the called user in the base station controller area according to the paging area information of the called user.
  • the early paging situation in the embodiment of the present invention is specifically as shown in FIG. 6, wherein the MSC2/VLR2 pages the user after receiving the ROUTREQ request, that is, sends a paging request to the BSC, after the paging response message is received.
  • the ROUTREQ request is returned to the HLR, and the temporary local subscriber number TLDN is brought back.
  • the other steps are the same as those in the embodiment shown in FIG. 5, and details are not described herein again.
  • the location information of the paging area for storing the user may be added in the HLR, and other available MSC/VLR processing services may be selected for the user registered in the MSC/VLR after determining an MSC/VLR failure.
  • the paging area location information is carried to the new MSC/VLR for searching for a user.
  • the schematic diagram of the called terminal call flow carrying the called service processing flag and using the paging area information is shown in FIG.
  • the ROUTE message sent by the HLR to the new MSC/VLR carries the mechanism of the called service processing flag.
  • the MSC/VLR of the embodiment of the present invention can have no user data in the local office.
  • the location information of the user is returned, that is, the temporary local number, otherwise it is processed according to the existing process.
  • the other steps are the same as those in the embodiment shown in FIG. 5, and details are not described herein again.
  • the MSC/VLR of the embodiment of the present invention can unconditionally return the user's location information without the user data in the local office, that is, temporary Local number.
  • the present invention also proposes a method for saving the paging area location information of the user without the HLR, the paging area information being the base station controller identification or location area information.
  • the location registration process is first performed, and the steps are similar to those shown in FIG. In the location registration process, it can be implemented according to the prior art, and the location information of the paging area of the user does not need to be reported to the HLR; the specific steps are as follows:
  • the BSC sends a location registration request message to the MSC/VLR ⁇ Location Update Request to perform location registration;
  • the MSC/VLR sends a REGNOT request to the HLR, where the MSC/VLR information of the user is carried.
  • HLR update saves the user's MSC/VLR information, and correctly returns the regnot response to MSC1/VLR1;
  • MSC1/VLR1 returns location information to the BSC. Updated Location Update Accept. When paging the called user, it needs to send a page to all BSCs connected to MSC2/VLR2.
  • this method can also be called full network paging.
  • the MSC2/VLR2 may find the called user through the whole network paging, that is, the MSC2/VLR2 is in all the connected BSC coverage areas. Paging the called user.
  • the specific steps are as shown in Fig. 8, and are explained as follows.
  • GMSC Global System for Mobile Communications
  • HLR Home Location Register
  • MDN number Mobile Directory Number
  • the MSC1/VLR1 registered by the called user has selected another MSC2/VLR2 according to the configuration, and sends a ROUTREQ request to MSC2/VLR2;
  • the MSC2/VLR2 after receiving the ROUTREQ request, the MSC2/VLR2 sends a paging message to all the BSCs to which it is connected, that is, respectively, initiates a paging Paging Request to the BSC;
  • paging response Paging Response is sent from a BSC to MSC2/VLR2;
  • MSC2/VLR2 receives the paging response, assigns the temporary local subscriber number TLDN to the user, and returns it to the HLR in the message routreq;
  • the HLR sends a mobile application partial location request response message locreq to the GMSC, carrying the temporary local subscriber number TLDN;
  • the GMSC sends an IAM message to the MSC2/VLR2 that allocates the temporary local subscriber number to the called user, where the called TLDN is carried;
  • MSC2/VLR2 finds no user data, requests authentication request AUTHREQ from HLRJ ⁇ ; 4i, authentication passes, HLR returns authreq response to MSC2/VLR2, indicating that authentication is passed; 4j, MSC2/VLR2 sends location registration to HLR ⁇ Message REGNOT;
  • HLR returns a regnot message, bringing back user data
  • the MSC2/VLR2 initiates an assignment request Assignment Request message, requesting the BSC to allocate an air interface channel for the user;
  • BSC returns the assignment completion message Assignment Complete message
  • the foregoing procedure takes the case of the early paging as an example, and does not exclude the normal paging mode of the MSC2/VLR2, that is, the situation of paging the user after receiving the incoming IAM message, and details are not described herein again.
  • step A3 can cover all connected base station controllers before returning the location information to the HLR.
  • the called user is paged in the area.
  • the MSC2/VLR2 may obtain the paging area information of the called user from the HLR, and may not perform such full network paging.
  • Such a full-network paging is necessary when the HLR does not have the function of storing the paging area information, because the MSC2/VLR2 cannot determine that a suitable BSC initiates paging; of course, the present invention does not limit the prior art.
  • Specific implementation of paging in the whole network The specific method is similar to the method described above, and the following is a brief description of the whole network paging as follows:
  • the GMSC sends a LOCREQ message to the HLR ⁇ , where the called MDN number is carried, and the location information of the called user is queried;
  • the HLR finds that the MSC1/VLR1 registered by the currently called user has failed, according to the configuration, the user selects another MSC2/VLR2, and sends a ROUTREQ request to the MSC2/VLR2;
  • MSC2/VLR2 receives the ROUTREQ request, assigns a temporary local subscriber number TLDN to the user, and returns it to the HLR in the message routreq;
  • the HLR sends a mobile application partial location request response message locreq to the GMSC, carrying the temporary local subscriber number TLDN;
  • the GMSC sends an IAM message to the MSC2/VLR2 that allocates the temporary local subscriber number to the called user, where the called TLDN is carried;
  • the MSC2/VLR2 after receiving the called TLDN, the MSC2/VLR2 sends a paging message to all BSCs connected thereto, that is, respectively, initiates paging Paging Request to the BSC;
  • paging response Paging Response is sent from a BSC to MSC2/VLR2;
  • MSC2/VLR2 finds no user data, requests authentication request AUTHREQ to HLR ⁇ ; 5i, authentication passes, HLR returns authreq response to MSC2/VLR2, indicating that authentication is passed; 5j, MSC2/VLR2 sends location registration to HLRJ ⁇ Message REGNOT;
  • HLR returns a regnot message, bringing back user data
  • the MSC2/VLR2 initiates an assignment request Assignment Request message, requesting the BSC to allocate an air interface channel for the user;
  • BSC returns the assignment completion message Assignment Complete message
  • the called user starts ringing, and MSC2/VLR2 returns the address full message ACM to the GMSC.
  • the RLR sends a ROUTREQ request to its selected MSC/VLR, it may also carry a flag indicating that subsequent service processing is required, which enables the reselected MSC2/VLR2 to determine whether it is required to be registered in this office.
  • the user performs the called business process. Specifically as mentioned above.
  • the implementation process of the method of the present invention is as shown in FIG. 9, and the specific steps are as follows: ⁇ . 6a, MC (short message center) sends an SMSREQ request to the HLR ⁇ , with the called user identifier MSID, requesting the called user short message called location information, that is, a short message address (SMS Address);
  • SMS Address short message address
  • the HLR finds that the MSC/VLR fault of the user is located, and then selects another available MSC/VLR, and sends an SMS REQ request SMS Address;
  • the HLR returns the user's SMS Address to the short message center MC through the smsreq message;
  • the short message center sends a short message to the MSC/VLR by using the SMS Address;
  • MSC/VLR returns the smdpp message.
  • a short message is sent on the service channel.
  • the specific steps are similar to the called process, and are not described here.
  • the MSC performs paging on the entire network or pages according to the range obtained from the HLR. Depending on whether the paging range information is saved in the HLR, after the assignment is completed, the MSC sends the message to the BSC through the ADDS Deliver message, and then sends the message to the BSC. MS.
  • the short message is sent on the control channel, and the MSC sends a Registration Request message to all connected or according to the range obtained from the HLR, depending on whether the paging range information is saved in the HLR.
  • the short message is sent to the user through the control channel by using the ADDS Page message.
  • the HLR when the HLR sends an SMSREQ request to its selected MSC/VLR request SMS Address, it may also carry a flag indicating that subsequent service processing is required, which enables the reselected MSC/VLR to determine whether the unregistered need is required.
  • the user in this office conducts the called business process. Specifically as mentioned above.
  • the embodiment of the present invention further provides a system for responding to a failure of a mobile switching center, including at least one BSC, at least two MSCs, and at least one HLR;
  • the BSC is configured to communicate with a user equipment and with the at least two MSCs /VLR communication connection, the user accesses the system through the BSC;
  • the MSC is connected to the HLR;
  • the HLR includes a detection module for detecting the status of the connected MSC, and a selection for selecting the MSC The module is configured to, after detecting the MSC failure, select another MSC for the user registered in the MSC to perform the called connection process.
  • the MSC may be provided with a VLR function, that is, the MSC in the system of the present invention may be MSC/VLR.
  • the BSC can be connected to two MSCs or can be connected to multiple MSCs; however, it is necessary to ensure that the BSC connection accessed by the user has at least two MSCs belonging to the same HLR jurisdiction.
  • the detection module of the HLR detects the status of the connected MSC.
  • the MSC1/VLR1 is in a fault state, and the selection module of the HLR selects another MSC2/VLR2 for the user according to the policy.
  • the called service is processed to ensure the connection service.
  • the specific method is as described above, and the module of the HLR is described below.
  • the embodiment of the present invention further provides a device for responding to a failure of a mobile switching center, which is an HLR.
  • a detection module for detecting the status of the connected MSC and a selection module for selecting an MSC from all mobile switching centers connected to the detection module are added to the HLR according to the embodiment of the present invention.
  • the MSC selection module is triggered, and the MSC selection module is determined according to the local configuration or the mutual aid node information of the serving MSC stored in the database.
  • a new available MSC continues the subsequent business processing.
  • the HLR of the embodiment of the present invention includes a signaling processing module, a service processing module, an operation and maintenance module, and a database module, and further includes a detecting module for detecting a state of the connected MSC, and a selecting module for selecting the MSC.
  • the schematic diagram of the internal function module of the HLR of the device in the embodiment of the present invention is as shown in FIG. 12; wherein the detection module is connected to the signaling processing module, the operation and maintenance module, and the database module; the selection module and the service processing module and the database The modules are connected; each of the modules is connected as shown in FIG. 12, and internal interactions are performed to cooperate with each other to complete the functions of the entire HLR.
  • the HLR device can be applied to the system of the present invention.
  • the detecting module has an external interface.
  • the signaling processing module detects or obtains input information from the operation and maintenance module, or receives fault information from other external entities, it is determined that an MSC is unreachable, and the situation is recorded in the database. That is, the fault information is stored in the database; of course, the fault information can also be stored in other modules.
  • the present invention does not limit the fault information to be stored in the specific location of the HLR, the location of the fault information is saved, and the connection relationship between the modules may be different.
  • FIG. 12 is an example in which the fault information is stored in the database module. It can be understood that the operation and maintenance module is used in the signaling processing module. Under the control of the device, the operation and maintenance information is notified to the detection module.
  • the database can also be used to record the corresponding data required for communication.
  • the signaling processing module receives the message and notifies the service processing module, and the service processing module finds that the MSC needs to take the called location information according to the record information in the database, and the service processing module triggers the selection module to pass the certain policy.
  • a new MSC is selected, and the interaction process of the new MSC is started under the cooperation of the control and signaling processing module of the service processing module.
  • the HLR may further include a storage module for storing user paging area information, that is, paging area location information where the user is located; as shown in FIG. 12, the storage module may be set in the database module, or may be separately set; It is connected to at least the service processing module and can also be connected to the signaling processing module.
  • the location information of the paging area is used to determine a location or a range for paging the user.
  • the location information may be LAC (Location Area Code) information or BSC identification information, and the BSC identifier may be in the access network.
  • the BSC is uniquely identified within the area, for example, the BSC identifier can uniquely identify the BSC within the area defined by the A-Flex architecture.
  • the user paging area information is stored on the HLR by using a storage module.
  • the detection module of the HLR detects the MSC failure.
  • the selection module of the HLR selects another MSC2/VLR2 to continue to be called according to the policy. Processing of the service; when the HLR sends the clear request to the MSC2/VLR2, it is found that the paging area information of the user is stored in the storage module, and the request is carried in the request under the control of the service processing module or the signaling processing module.
  • the MSC/VLR sends a REGNOT (Registration Notice) message carrying the paging area information to the HLR, and the HLR is in the service processing module or signaling.
  • the paging area location information is saved and updated in the storage module under the control of the processing module.
  • the REGNOT request is mainly used to report the user's new location information to the home location register HLR. The specific method is as described above.
  • the HLR selects another available MSC in the A-Flex area, so that the original registration is currently in the downtime.
  • the user in the MSC/VLR can correctly perform the called service, which makes the CDMA2000 network circuit domain disaster recovery solution more complete and enhances the stability of the system.
  • the above only describes the A-Flex mechanism as an example. The same applies to the Iu-Flex mechanism. The specific process is the same and will not be described again.

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Description

一种应对移动交换节点故障的系统、 设备及方法 本申请要求于 2006 年 5 月 31 日提交中国专利局、 申请号为 200610060974.4、 发明名称为 "一种应对移动交换节点故障的系统、 设备及方 法"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
本发明涉及通信技术领域，尤其涉及一种应对移动交换节点故障的通信系 统、 设备及方法。
背景技术
随着通信系统的发展和越来越大容量的建网，安全性是通信运营商们越来 越关注的重点，如何避免单点故障造成的大面积业务中断是每个设备制造商面 临的问题。
Iu-Flex技术是 3GPP在 Release 5中提出的一种交换架构下电路域容灾机制 , 在其中定义了 "池" 的概念， 池中包括多个无线网络控制器（Radio Network Controller, 以下筒称 RNC ) /基站控制器（ Base Station Controller , 以下筒称 BSC ) 以及多个 CN网元 ( Core Network, 核心网络） 。 其中的每个 RNC/BSC 节点可以连接多个核心网网元。
正常情况下， Iu-Flex机制通过: TH ( Network Resource Indicator, 网络资源 指示）方式保证， 当某个用户在池内 RNC管理的地区内漫游时， 所有的核心网 处理过程在池内特定的一个 CN节点上进行， 即对于单个用户而言， 其在池内 只有一个归属的 CN处理节点，这样不存在 CN负荷分担的概念，可以避免频繁的 位置更新。 而对于池内所有用户而言， 被划分到不同的归属 CN节点， 所以是 负荷分担的， 这种对用户池内归属 CN节点的划分， 应该是在用户初次在这个 池内登记时， 由 RNC来决定的， 决定的方式应该是通过 IMSI-HASH算法来完 成分配， 后续在池内的所有 NAS ( Non Access Stratum, 非接入层）过程则由 NRI保证到归属 CN。 异常情况下， 若池内某个 CN节点故障， 则由 RNC通过特 定算法将归属该 CN节点的用户调整到其它 CN节点。
相似的， 在 CDMA2000无线核心网， 也可以部署类似于 Iu-Flex的机制， 称 为 A-Flex , 即 CDMA2000网络中一个 BSC可以连接多个 MSC/VLR ( Mobile Switching Center/Visit Location Register, 移动交换中心 /拜访位置寄存器）， 类 似于 3GPP中 "池" 的概念， 本说明书所述 A-Flex区域是至少一个 BSC (—般有 多个）和同时为其服务的至少两个 MSC/VLR的集合， 每个 BSC与该区域内所 有 MSC/VLR相连。 附图 1所示为现有技术的位置登记流程图， 说明如下。 BSC 向 MSC1/VLR1发送位置登记请求消息 Location Update Request进行位置登记； 该 MSC1/VLR1发现用户所在的 MSC/VLR改变， 向 HLR发送注册通知请求 ( REGNOT )请求， 其中携带用户位置信息； HLR返回注册通知响应 （regnot 响应） 到 MSC1/VLR1 ; MSC1/VLR1向 BSC返回位置信息已更新的 Location Update Accept消息。
但是，无论是 Iu-Flex还是 A-Felx,现有技术中都无法对 MSC/VLR突然瘫机， 无法处理信令的场景进行有效保护。 导致 MSC/VLR突然瘫机的原因很多， 例 如大话务量冲击， 突发性故障等。 在 Iu-Flex机制中， 负载决定要重新分配后， 由于 RNC只在位置更新时才将后续与该用户相关的消息重新定向到用户新的 归属 MSC/VLR,在用户没有位置更新前，始呼、终呼还只能由原来的 MSC/VLR 进行处理， 因此， 如果原先的 MSC/VLR突然瘫机， 无法正常处理信令， 目前 登记在该 MSC/VLR上的用户进行位置登记前都将处于通讯故障状态， 这段时 间长短可能与下一次周期位置登记的时间或者其它可能触发位置登记的操作， 例如网络侧发起强制位置登记请求，用户移动到一个新的位置区而自动发起位 置登记等， 来临的时刻有关。
和 3GPP机制不同， CDMA2000核心网络的原有隐含位置登记机制就能够保 证在 A-Flex架构下始呼的重定向问题， 但是， 目前 CDMA2000网络中没有方案 来解决原 MSC/VLR不能处理业务后用户被叫业务的重定向问题。
因此， 现有的 Iu-Flex和 A-Flex机制， 都无法解决 MSC VLR突然瘫机无法处 理信令情况下，用户需要被重新定向在新的 MSC/VLR上进行被叫业务的问题。 发明内容
本发明实施例的提供一种应对移动交换中心故障的系统、设备及方法， 以 避免网络中 MSC/VLR突然瘫机无法处理信令时， 用户在重新进行位置登记之 前无法进行被叫业务， 使得用户在原归属 MSC/VLR瘫机后， 能够被重新定向 到其它 MSC/VLR, 在新的 MSC/VLR上正确进行被叫业务。
本发明实施例的技术方案如下： 一种应对移动交换节点故障的方法，其用于包括至少一个基站控制器、至 少两个移动交换中心以及至少一个归属位置寄存器的系统中， 其步骤包括： 所述归属位置寄存器获知第一移动交换中心故障；
被叫业务请求方向所述归属位置寄存器提出请求，为被叫用户获取位置信 息，其中所述被叫用户注册在所述第一移动交换中心， 所述归属位置寄存器为 所述被叫业务请求方选择第二移动交换中心并向所述第二移动交换中心请求 位置信息；
所述第二移动交换中心返回所述位置信息给所述归属位置寄存器； 所述归属位置寄存器返回所述位置信息给所述被叫业务请求方；由所述被 叫业务请求方根据所述位置信息进行后续业务。
一种应对移动交换节点故障的系统，包括与一个归属位置寄存器连接的至 少两个移动交换中心；
所述归属位置寄存器，用于获知所述至少两个移动交换中心中的第一移动 交换中心故障；接收来自被叫业务请求方的为被叫用户设备获取位置信息的请 求，为所述被叫业务请求方选择第二移动交换中心并向所述第二移动交换中心 请求所述位置信息，接收所述第二移动交换中心返回的位置信息，将所述位置 信息发送给被叫业务请求方。
一种应对移动交换节点故障的设备， 包括业务处理模块，该设备还包括检 测模块和选择模块；
所述检测模块， 用于检测所连接移动交换中心的状态， 判断出某个移动交 换中心不可达时， 将该移动交换中心的不可达信息进行记录；
所述业务处理模块，用于确定需要取被叫用户位置信息的移动交换中心故 障后， 通知所述选择模块进行重新选择； 根据所述选择模块返回的选择信息， 与所述另一非故障的移动交换中心进行交互；
所述选择模块， 用于根据接收到的通知， 从所述检测模块所连接的所有移 动交换中心内选择另一非故障的移动交换中心，将所选择的移动交换中心通知 给业务处理模块。
本发明实施例所提供的一种应对移动交换中心故障的系统、 设备及方法， 当原 MSC/VLR出现故障， 在原来位置登记在原 MSC/VLR上且没有重新位置 登记的用户进行被叫业务时， 由归属位置寄存器选择另一个 MSC/VLR进行被 叫业务处理， 使这些登记在原 MSC/VLR的用户在原 MSC/VLR故障后仍能正 确进行被叫业务， 完善了网络电路域容灾方案， 并增强了系统的稳定性。 附图说明
图 1为现有技术的位置登记流程图；
图 2为根据本发明实施例的流程示意图；
图 3为根据本发明实施例的 HLR得到用户的寻呼区域信息的示意图； 图 4为才艮据本发明实施例的 HLR得到 MSC/VLR互助节点信息的示意图； 图 5为根据本发明实施例的被叫终呼使用寻呼区域信息的正常寻呼流程示 意图；
图 6为根据本发明实施例的被叫终呼使用寻呼区域信息的早寻呼流程示意 图；
图 7为根据本发明实施例的携带被叫业务处理标志且使用寻呼区域信息的 被叫终呼流程示意图；
图 8为根据本发明实施例的全网早寻呼流程示意图；
图 9为根据本发明实施例的被叫短消息业务流程示意图；
图 10为根据本发明实施例的在业务信道下发短消息的流程示意图； 图 11为根据本发明实施例的在控制信道下发短消息的流程示意图； 图 12为根据本发明实施例设备的 HLR内部功能模块示意图。
具体实施方式
以下结合附图， 将对本发明的各较佳实施例进行更为详细的说明。 在本发明实施例中， 当归属位置寄存器发现第一移动交换中心无法工作， 在被叫业务请求方向所述归属位置寄存器提出为被叫用户获取位置信息请求 时， 其中被叫用户注册在所述第一移动交换中心； 归属位置寄存器选择同一 A-Flex区域中第二移动交换中心，请求到位置信息后返回给被叫业务请求方进 行被叫业务。 第二移动交换中心在寻找被叫用户时如果能够得到寻呼区域信 息，就在该区域内寻找所述被叫用户； 否则就在所述第二移动交换中心所管辖 的所有基站控制器范围内寻找。
因此，本发明实施例提供了一种应对移动交换中心故障的方法， 其用于包 括至少一个基站控制器、 至少两个移动交换中心以及至少一归属位置寄存器
( HLR, Home Location Register )的系统中 , 所述基站控制器和所述移动交换 中心相连， 方法流程图如附图 2所示， 其包括以下步骤。
Al、 HLR获知第一移动交换中心 MSC1/VLR1故障。 当 MSC1 VLR1突然瘫 机无法处理信令时， HLR检测到目的信令点不可达或者根据从其它渠道上报的 信息， 例如由一操作维护管理实体通过一管理接口将故障信息上报， 或者由 AC ( Authentication Center, 鉴权中心）上报给 HLR, 籍此判断原 MSC1/VLR1 已经故障以致于无法工作。
A2、 被叫业务请求方向 HLR提出请求， 为被叫用户获取所需位置信息， 其中被叫用户注册在 MSC1/VLR1 , HLR为请求方选择 MSC2/VLR2并向第二移 动交换中心请求所述位置信息。上述位置信息是被叫用户的临时本地用户号码 或为被叫用户提供服务的移动交换中心的标识， 用于将业务路由到被叫局。
A3、 第二移动交换中心返回位置信息给所述 HLR。 该返回的位置信息是 通过移动应用部分（ MAP, Mobile Application Part )消息进行传递。 应当理解 的是， MAP消息可以是现有消息的扩展。
A4、 HLR返回所述位置信息给所述请求方。
A5、 请求方根据所述位置信息进行后续业务。 其中， 如果是被叫呼叫流 程， 请求到的位置信息是临时本地用户号码 TLDN ( Temporary Local Directory Number ) ； 如果是被叫短消息流程， 请求到的位置信息是短消息地址（ SMS Address ) , 被叫业务请求方用这个信息发送消息； 如果是被叫呼叫流程， 发 送的是初始地址消息（IAM )消息， 如果是被叫短消息， 发送的是 SMSDPP消 白
须作说明的是， 本发明实施例中的 MSC可以带有 VLR功能， 因此， 本发明 实施例的 MSC发生故障的原因有可能是其 VLR发生故障，而本发明实施例方法 同样适用于该种情况，并且本发明的上下文描述中可能仅对 MSC做出说明，但 本领域技术人员显然理解关于 VLR故障时的情形。 本发明实施例所述的方法， 其中， 步骤 A2中 HLR根据本地配置信息或从 第一移动交换中心得到的互助移动交换中心信息进行所述第二移动交换中心 i 一 6—
的选择。当有用户被叫业务流程需要到 MSC1/VLR1取用户的位置信息时， HLR 根据策略， 例如本地配置信息或者先前从 MSC1/VLR1得到的其互助移动交换 中心信息， 选择一与 MSC1/VLR1处于一个 A-Flex区域的第二 MSC/VLR (如 MSC2/VLR2)为被叫用户请求位置信息， HLR中如果存储有被叫用户的寻呼区 域信息， HLR可以在移动应用部分路由请求（MAP ROUTREQ ) 消息或短消 息请求 （MAP SMSREQ ) 消息中携带 HLR中保存的被叫用户的寻呼区域信息 以帮助 MSC2/VLR2缩小寻找用户的范围； 否则 MSC2在需要寻找用户时将在 MSC2/VLR2所连接所有 BSC范围内寻找用户。 上述互助移动交换中心指在本 移动交换中心故障情况下可以代替本移动交换中心处理业务的移动交换中心， 互为互助的移动交换中心应该属于同一个 A-Flex区域。
当进行的是被叫呼叫业务或者是业^言道发送短消息时，寻找过程表现为 寻呼。 在 MSC/VLR所连接所有 BSC范围内的寻呼也称为全网寻呼。 当进行的 是被叫控制信道短消息业务时， 寻找过程表现为 MSC/VLR向所连接的部分或 者全部 BSC发送 Registration Request (注册请求） 消息。 第二移动交换中心寻 呼用户的过程可以发生在收到 ROUTREQ请求时（早寻呼情况） ， 也可以发生 在收到来自被叫业务请求方的入局消息后（正常寻呼情况）。 后面部分实施例 侧重描述正常寻呼的情况，部分实施例侧重描述早寻呼的情况，但是应当理解 的是，本发明方法适用于这两种寻呼情况， 本领域技术人员显然理解关于早寻 呼和正常寻呼情况的实现。
为了区别异常情况移动交换中心错误地收到为未注册在本局的用户取位 置信息的请求消息， 本发明实施例在 A2步骤 HLR向第二移动交换中心取位置 信息时， 可以可选地携带一个表明需要该局处理后续被叫业务的标志， 这样实 现要求 MSC2/VLR2收到这个标志时才对没有登记在本局的用户返回位置信 息， 否则直接按照现有流程进行处理。 本发明所述实施例中，其釆用的 HLR可以具备存储被叫用户的寻呼区域信 息的功能， 也可以不具备存储所述寻呼区域信息的功能。 其中， 寻呼区域位置 信息包括 BSCID ( BSC ID, 基站控制器标识）或 LAC ( Location Area Code, 位置区域码）， 用于确定寻呼用户的位置或范围。 以下分別阐述两种情况下实 现的方法。 如果 HLR具备存储所述寻呼区域信息的功能， HLR可以在 ROUTREQ消息 (被叫终呼）或者 SMSREQ消息（被叫短消息）带给笫二移动交换中心， 用于 寻找用户时缩小范围。 HLR也可以在 locreq消息 （被叫终呼）或者 smsreq消息 (被叫短消息） 中带给被叫业务请求方， 由所述被叫业务请求方在入局消息， IAM消息 （被叫终呼）或者 SMSDPP消息（被叫短消息） 中带给第二移动交换 中心。本发明实施例的方法还包括 MSC将用户的寻呼区域信息通知 HLR, HLR 保存所述寻呼区域信息的步骤， 包括： Bl、 所述移动交换中心发现用户所在 的寻呼区域信息变化， 向 HLR发送携带用户位置信息的位置更新消息； B2、 HLR更新并保存对应用户的寻呼区域信息。 其中步驟 B1中 MSC在移动应用部 分位置登记请求（MAP REGNOT ) 消息中向所述 HLR上报用户的位置信息。
具体步骤如附图 3所示， 说明如下。
la、 BSC向 MSC1/VLR1发送位置登记请求消息 Location Update Request进 行位置登记， 其中携带用户所在的寻呼区域信息；
lb、 该 MSC1/VLR1如果发现用户所在的寻呼区域信息变化， 则向 HLRJ^ 送 REGNOT请求， 其中携带用户所在的寻呼区域信息； 须作说明的是， 携带用 户寻呼区域信息的请求消息可以是现有消息的扩展， 其能够携带寻呼区域信 息。
lc、 HLR更新保存用户的寻呼区域信息， 返回 regnot响应到 MSC1/VLR1; ld、 MSC1/VLR1向 BSC返回位置信息已更新的 Location Update Accept消 自
HLR选择另一可用 MSC/VLR的方法如附图 4所示， 具体说明如下。
HLR本地配置各个 MSC所属 A-Flex区域的情况， 如 HLR上配置 MSC1、
MSC2、 MSC3属于 A-Flex区域 1 , MSC4、 MSC5、 MSC6属于 A-Flex区域 2， 则 在发现 MSCl故障且需要为注册在 MSCl上的用户进行被叫业务的时候选择 A-Flex区域 1中的可用 MSC, 如 MSC2 (也即 MSC2为 MSC1的互助 MSC节点）； 如果 MSC5故障且需要为注册在 MSC5上的用户进行被叫业务的时候选择 A-Flex区域 2中的可用 MSC, 如 MSC4 (也即 MSC4为 MSC5的互助 MSC节点）。 或者是在用户位置登记时， 服务 MSC (当前为用户提供服务的 MSC被称 为服务 MSC )根据本地配置， 例如 MSC1上配置了 MSC2为其同在一个 A-Flex 区域的互助 MSC , 在位置登记消息中可选的携带本 MSC故障后的互助 MSC , HLR保存所述互助 MSC信息， 在服务 MSC故障后选择已经保存的互助 MSC进 行被叫业务服务。 需要注意的是 MSC向 HLR^送的互助 MSC信息不一定包含 在每一条位置登记消息中，可能的实现包括 MSC发送过该互助节点信息给 HLR 后， 只有在互助节点信息变化后才再一次在位置登记消息中包含通知 HLR。
其中， REGNOT消息中互助节点信息可以扩展现有参数进行携带，也可以 新增参数进行携带。
另外， 服务 MSC还可以在其它 MAP消息中， 如新增的用于上报互助节点 信息的 MAP消息， 携带互助节点信息， 如采用定时上报， 或者本地配置改变 后立刻上报，或者是二者结合的方式。也可以 HLR主动发起到服务 MSC的新增 MAP消息后， 如互助节点请求消息， 服务 MSC在响应消息中返回互助节点信 息。 HLRJ^起请求也可以是定时进行的。本发明并不限制 HLR从第一移动交换 中心获得其互助节点的具体实现方法。 当 MSC2/VLR2从入局初始地址消息中收到临时本地用户号码后， 根据从 ROUTREQ请求中得到寻呼区域位置信息寻呼用户， 当寻呼响应上来后， 进行 正常的被叫流程接续， 如附图 5所示， 其包括流程说明如下。 其中， HLR中保 存所述寻呼区域信息， 并采用 MAP消息将所述寻呼区域信息带给第二移动交 换中心。 MAP消息是取路由请求消息或其它新定义的 MAP消息。 应当理解的 是， MAP消息具备携带所述寻呼区域信息的能力。
2a、 GMSC ( Gateway Mobile Switching Center,关口移动交换中心）向 HLR 发送 LOCREQ消息， 其中携带被叫 MDN号码（ Mobile Directory Number, 移动 用户号码簿号码） ， 查询被叫用户位置信息；
2b、 如果该 HLR^现当前被叫用户登记的 MSC1/VLR1已经发生故障， 则 才艮据策略为用户选择了另一个 MSC2/VLR2 , 并发送 ROUTREQ请求到 MSC2/VLR2, 其中携带 HLR中保存的用户的寻呼区域位置信息； 2c、 MSC2/VLR2收到 ROUTREQ请求， 为用户分配临时本地用户号码 TLDN ( Temporary Local Directory Number ) ， 并在消息 routreq中返回给 HLR;
2d、 HLR向 GMSC发送移动应用部分位置请求响应消息 locreq, 携带临时 本地用户号码 TLDN;
2e、 GMSC向为被叫用户分配临时本地用户号码的 MSC2/VLR2发送 IAM
( Initial Address Message, 初始地址消息） 消息， 其中携带了被叫 TLDN;
2f、 MSC2/VLR2收到 TLDN后， 根据在 ROUTREQ请求中得到的寻呼区域 位置信息， 将找到合适的 BSC/BSCs发起寻呼 Paging Request;
2g、 BSC将寻呼响应 Paging Response发到 MSC2/VLR2;
2h、 MSC2/VLR2发现没有用户数据， 向 HLRJ^起鉴权请求 AUTHREQ;
2i、 鉴权通过， HLR向 MSC2/VLR2返回 authreq响应， 指示鉴权通过； 2j、 MSC2/VLR2向 HLR^送位置登记消息 REGNOT;
2k、 所述 HLR返回 regnot消息， 带回用户数据；
21、 MSC2/VLR2发起指配请求 Assignment Request消息， 请求 BSC为用户 指配空口信道；
2m、 BSC返回指配完成消息 Assignment Complete消息；
2n、 此时被叫用户开始振铃， MSC2/VLR2向 GMSC返回地址全消息 ACM ( Address Complete Message ) 。
上述过程即是本发明实施例的用户正常被叫接续流程。须做说明的是， 如 果步骤 2h中鉴权请求没有通过， 则被叫业务失败； 并且上述关于 BSC、 MSC/VLR、 HLR以及其与用户之间的始呼、 终呼等过程都是本领域技术人员 所熟知的， 因此不再赘述。 本方法的实现流程也可以是被叫业务请求方从 HLR得到寻呼区域信息 ,在 入局初始地址消息中将所述寻呼区域信息带给第二移动交换中心； 其中， HLR 在移动应用部分消息中将其保存的寻呼区域信息带给被叫业务请求方。此种情 况下具体流程中相应的 2b ~ 2f的步驟为：
2bl、如果该 HLRJ^现当前被叫用户登记的 MSC1/VLR1已经发生故障， 则 根据策略为用户选择了另一个 MSC2/VLR2 , 并发送 ROUTREQ请求到 MSC2/VLR2; 该消息中未携带用户的寻呼区域位置信息；
2cl、 MSC2/VLR2收到 ROUTREQ请求， 为用户分配临时本地用户号码 TLDN, 并在消息 routreq中返回给 HLR;
2dl、 HLR向 GMSC发送移动应用部分位置请求响应消息 locreq, 其中携带 HLR中保存的用户的寻呼区域位置信息和临时本地用户号码 TLDN;
2el、 GMSC向为被叫用户分配漫游号码的 MSC2/VLR2发送 IAM消息， 其 中携带了用户的寻呼区域位置信息和被叫 TLDN;
2fl、 MSC2/VLR2收到用户的寻呼区域位置信息和被叫 TLDN后， 根据寻 呼区域位置信息， 将找到合适的 BSC BSCs发起寻呼 Paging Request。 本发明实施例的方法由 HLR记录用户的寻呼区域位置信息， 在原始 MSC 出现故障时可以根据策略确定用于替换原始 MSC的第二 MSC, 为原本注册在 原始 MSC的用户执行被叫业务，本发明实施例的方法在 HLR中保存和更新用户 的寻呼区域信息的过程能够帮助第二 MSC将寻找用户的范围缩小至一个位置 区或者一个 BSC。 本领域技术人员熟知现有技术中 HLR能够确定用户所在的
参见图 2, 步骤 A3在返回所述位置信息给 HLR之前， 第二移动交换中心根 据被叫用户的寻呼区域信息在所述基站控制器区域内寻呼所述被叫用户。本发 明实施例的早寻呼情况具体如附图 6所示，其中， MSC2/VLR2在收到 ROUTREQ 请求后先寻呼用户， 即向 BSC发送寻呼请求， 在寻呼响应消息收到后才向 HLR 返回 ROUTREQ请求， 带回临时本地用户号码 TLDN, 其它步骤与图 5所示实施 例相同， 在此不再赘述。
本发明实施例可以在 HLR中增加了保存用户的寻呼区域位置信息，并能够 在判断出某个 MSC/VLR故障后为登记在该 MSC/VLR的用户选择其它可用的 MSC/VLR处理业务， 将寻呼区域位置信息带给新的 MSC/VLR用于寻找用户； 本发明实施例的携带被叫业务处理标志且使用寻呼区域信息的被叫终呼流程 示意图如附图 7所示 , 通过采用 HLR发往新的 MSC/VLR的 ROUTE消息携带被 叫业务处理标志的机制 , 本发明实施例的 MSC/VLR能够在本局没有用户数据 的情况下， 收到 HLR消息中所带标志指示后返回用户的位置信息， 即临时本地 号码， 否则按照现有流程处理。 其它步骤与图 5所示实施例相同， 在此不再赘 述。 如果不釆用 HLR发往新的 MSC/VLR的 ROUTE消息携带被叫业务处理标志 的机制， 本发明实施例的 MSC/VLR能够无条件在本局没有用户数据的情况下 返回用户的位置信息， 即临时本地号码。 如果 HLR不具备存储所述寻呼区域信息的功能时，本发明还提出了一种无 需 HLR保存用户的寻呼区域位置信息的方法，该寻呼区域信息是基站控制器标 识或位置区信息。 首先进行位置登记流程， 步骤与附图 1所示流程相似。 在位 置登记过程中可以按照现有技术实施，不需要将用户的寻呼区域位置信息上报 给 HLR; 具体步骤如下：
3a、 BSC向 MSC/VLR^送位置登记请求消息 Location Update Request进行 位置登记；
3b、 该 MSC/VLR如果发现用户所在的 MSC/VLR变化， 则向 HLR发送 REGNOT请求， 其中携带用户所在的 MSC/VLR信息；
3c、 HLR更新保存用户的 MSC/VLR信息， 正确返回 regnot响应到 MSC1/VLR1;
3d、 MSC1/VLR1向 BSC返回位置信息已更新的 Location Update Accept消 在寻呼被叫用户的时候需要向 MSC2/VLR2所连接的所有 BSC发送寻呼
( Paging Request ) 消息， 这种方法也可以称为全网寻呼。 本发明实施例所述 的方法， 步骤 A3在返回所述位置信息给所述 HLR之前， MSC2/VLR2可以通过 全网寻呼寻找被叫用户， 即 MSC2/VLR2在所连接的所有 BSC覆盖区域内寻呼 所述被叫用户。 具体步驟如附图 8所示， 说明如下。
4a、 GMSC ( Gateway Mobile Switching Center ,关口移动交换中心）向 HLR 发送 LOCREQ消息， 其中携带被叫 MDN号码（Mobile Directory Number, 移动 用户号码簿号码） ， 查询被叫用户位置信息；
4b、 如果该 HLRJ^现当前被叫用户登记的 MSC1/VLR1已经发生故障， 则 根据配置为用户选择了另一个 MSC2/VLR2 , 并发送 ROUTREQ请求到 MSC2/VLR2;
4c、 MSC2/VLR2收到 ROUTREQ请求后， 向其所连接的所有 BSC发送寻呼 消息， 即分别向所述 BSC发起寻呼 Paging Request;
4d、 寻呼响应 Paging Response从某一 BSC发到 MSC2/VLR2;
4e、 MSC2/VLR2收到寻呼响应， 为用户分配临时本地用户号码 TLDN, 并 在消息 routreq中返回给 HLR;
4f、 HLR向 GMSC发送移动应用部分位置倩求响应消息 locreq, 携带临时 本地用户号码 TLDN;
4g、 GMSC向为被叫用户分配临时本地用户号码的 MSC2/VLR2发送 IAM 消息， 其中携带了被叫 TLDN;
4h、 MSC2/VLR2发现没有用户数据， 向 HLRJ^起鉴权请求 AUTHREQ; 4i、 鉴权通过， HLR向 MSC2/VLR2返回 authreq响应， 指示鉴权通过； 4j、 MSC2/VLR2向 HLR^送位置登记消息 REGNOT;
4k、 HLR返回 regnot消息， 带回用户数据；
41、 MSC2/VLR2发起指配请求 Assignment Request消息， 请求 BSC为用户 指配空口信道；
4m、 BSC返回指配完成消息 Assignment Complete消息；
4n、 此时被叫用户开始振铃， MSC2/VLR2向 GMSC返回地址全消息 ACM ( Address Complete Message ) 。
类似的， 上述流程以早寻呼情况为例， 不排除 MSC2/VLR2使用正常寻呼 方式， 即收到入局 IAM消息后寻呼用户的情况， 在此不再赘述。
需要说明的是， 在实际应用中， 无论 HLR是否具备存储所述寻呼区域信息 的功能， 步驟 A3在返回所述位置信息给 HLR之前， MSC2/VLR2都可以在所连 接的所有基站控制器覆盖区域内寻呼所述被叫用户。 当然，如果 HLR具备存储 所述寻呼区域信息的功能时， 所述 MSC2/VLR2可以从所述 HLR得到被叫用户 的寻呼区域信息，可以不进行这样的全网寻呼。 当 HLR不具备存储所述寻呼区 域信息的功能时， 这样的全网寻呼是必须的， 因为所述 MSC2/VLR2无法确定 合适的 BSC发起寻呼； 当然， 本发明并不限制现有技术中全网寻呼具体的实施 具体方法与之前所述的方法类似， 在此以全网寻呼为例简单说明如下：
5a、 GMSC向 HLR^送 LOCREQ消息， 其中携带被叫 MDN号码， 查询被叫 用户位置信息；
5b、 如果该 HLR发现当前被叫用户登记的 MSC1/VLR1已经发生故障， 则 根据配置为用户选择了另一个 MSC2/VLR2 , 并发送 ROUTREQ请求到 MSC2/VLR2;
5c、 MSC2/VLR2收到 ROUTREQ请求， 为用户分配临时本地用户号码 TLDN， 并在消息 routreq中返回给 HLR;
5d、 HLR向 GMSC发送移动应用部分位置倩求响应消息 locreq， 携带临时 本地用户号码 TLDN;
5e、 GMSC向为被叫用户分配临时本地用户号码的 MSC2/VLR2发送 IAM 消息， 其中携带了被叫 TLDN;
5f、 MSC2/VLR2收到被叫 TLDN后，向其所连接的所有 BSC发送寻呼消息， 即分别向所述 BSC发起寻呼 Paging Request;
5g、 寻呼响应 Paging Response从某一 BSC发到 MSC2/VLR2;
5h、 MSC2/VLR2发现没有用户数据， 向 HLR^起鉴权请求 AUTHREQ; 5i、 鉴权通过， HLR向 MSC2/VLR2返回 authreq响应， 指示鉴权通过； 5j、 MSC2/VLR2向 HLRJ^送位置登记消息 REGNOT;
5k、 HLR返回 regnot消息， 带回用户数据；
51、 MSC2/VLR2发起指配请求 Assignment Request消息， 请求 BSC为用户 指配空口信道；
5m、 BSC返回指配完成消息 Assignment Complete消息；
5n、此时被叫用户开始振铃， MSC2/VLR2向 GMSC返回地址全消息 ACM。 同样的， HLR在发送 ROUTREQ请求到其选择的 MSC/VLR时，也可以携带 一表明需要进行后续业务处理的标志 , 该标志使得重新选择的 MSC2/VLR2能 够判断是否需要对该未登记在本局的用户进行被叫业务过程。 具体如前所述。 当被叫为短消息时， 本发明方法的实现流程如附图 9所示， 具体步骤说明 ： ^下。 6a、 MC (短消息中心） 向 HLR^送 SMSREQ请求， 其中带有被叫用户标 识 MSID,请求被叫用户短消息被叫位置信息， 即短消息地址（SMS Address )；
6b、 HLR发现用户所在的 MSC/VLR故障， 则选择另一可用 MSC/VLR, 发 送 SMSREQ请求 SMS Address;
6d、 HLR通过 smsreq消息返回用户的 SMS Address给短消息中心 MC;
6e、 短消息中心使用 SMS Address向 MSC/VLR下发短消息；
6f、 MSC/VLR返回 smdpp消息。
短消息从 MSC发送到 MS, 有多种实现方法， 简单说明如下。
如附图 10所示， 在业务信道下发短消息， 具体步骤类似于被叫流程， 在此 不再赘述。 MSC对用户进行全网寻呼或者才 据从 HLR中得到的范围进行寻呼， 视 HLR中是否保存了寻呼范围信息而定， 指配完成后 MSC通过 ADDS Deliver 消息发送给 BSC, 然后发送给 MS。
或者是如附图 11所示，在控制信道下发短消息， MSC向所连接的所有或者 根据从 HLR中得到的范围下发 Registration Request消息， 视 HLR中是否保存了 寻呼范围信息而定， 用户进行位置登记后， 使用 ADDS Page消息将短消息通过 控制信道下发给用户。
同样的， HLR在发送 SMSREQ请求到其选择的 MSC/VLR请求 SMS Address 时，也可以携带一表明需要进行后续业务处理的标志， 该标志使得重新选择的 MSC/VLR能够判断是否需要对该未登记在本局的用户进行被叫业务过程。 具 体如前所述。 本发明实施例还提供了一种应对移动交换中心故障的系统，包括了至少一 BSC, 至少两个 MSC、 以及至少一 HLR; 所述 BSC用于通讯连接用户设备并且 与所述至少两个 MSC/VLR通讯连接， 用户通过 BSC接入系统； MSC与 HLR相 连接； 本发明实施例所述系统中，所述 HLR包括用于检测所连接 MSC状态的检 测模块， 以及一用于选择 MSC的选择模块， 用于在检测到 MSC故障后， 为注 册在该 MSC的用户选择另一 MSC进行被叫接续过程。需要说明的是，所述 MSC 是可以带有 VLR功能的， 也就是说， 本发明所述系统中的 MSC可以是 MSC/VLR。
如果一个 BSC只和一个 MSC相连， 当该 MSC发生故障时， 即使 HLR选了 另一个 MSC, 也由于这个新 MSC与用户所在 BSC不相连而无能为力。 因此， 本发明所提供的系统中， BSC可以和两个 MSC相连接， 也可以和多个 MSC相 连接； 但是， 要保证用户接入的 BSC连接有至少两个属于同一 HLR管辖范围的 MSC。
采用所述系统， HLR的检测模块检测所连接 MSC状态， 当被叫用户进行被 叫业务时所在的 MSC1/VLR1为故障状态， HLR的所述选择模块根据策略为用 户选择另一个 MSC2/VLR2进行被叫业务处理， 从而保证了接续的服务。 具体 方法如前所述， HLR的模块在下面继续进行说明。
同时， 本发明实施例还提供了一种应对移动交换中心故障的设备， 为一 HLR。本发明实施例所述 HLR中新增用于检测所连接 MSC状态的检测模块和用 于从所述检测模块所连接的所有移动交换中心内选择 MSC的选择模块。在业务 处理过程中，业务处理模块处理被叫业务相应消息时发现数据库中保存的服务 MSC状态为故障， 则触发 MSC选择模块， 根据本地配置或数据库中保存的服 务 MSC的互助节点信息， 共同决定一个新的可用 MSC, 继续后续业务处理。
本发明实施例所述 HLR包括信令处理模块、业务处理模块、操作维护模块 和数据库模块，其还包括用于检测所连接 MSC状态的检测模块， 以及用于选择 MSC的选择模块。本发明实施例所述设备的 HLR内部功能模块示意图如附图 12 所示；其中，所述检测模块与信令处理模块、操作维护模块和数据库模块相连； 所述选择模块与业务处理模块和数据库模块相连；其中各个模块分别如附图 12 所示相连， 进行内部交互， 互相配合完成整个 HLR的功能。 该 HLR设备可以应 用于本发明所述系统。
检测模块对外存在接口，当通过信令处理模块检测或者得到来自操作维护 模块的输入信息，或者收到来自外部其它实体告知的故障信息后判断某个 MSC 不可达， 将这种情况记录到数据库， 即故障信息保存在数据库中； 当然， 故障 信息也可以保存在其它模块中， 本发明不限定故障信息保存在 HLR的具体位 置， 故障信息保存的位置不同， 模块间的连接关系也可能不同。 附图 12以故障 信息保存在数据库模块中为例。可以理解，操作维护模块用于在信令处理模块 的控制下，将操作维护信息通知给检测模块。数据库还可以用于记录通信所需 相应数据。
当被叫业务到来， 由信令处理模块接收消息并通知到业务处理模块， 业务 处理模块根据数据库内的记录信息发现需要取被叫位置信息的 MSC故障，业务 处理模块触发选择模块通过一定策略从选择一个新的 MSC,在业务处理模块的 控制和信令处理模块的配合下， 开始到这个新 MSC的交互过程。
HLR还可以包括存储模块，用于存储用户寻呼区域信息， 即用户所在的寻 呼区域位置信息； 如附图 12所示， 存储模块可以设置在数据库模块中， 也可以 单独设置； 单独设置时其至少与业务处理模块相连接，也可以和信令处理模块 相连接。所述寻呼区域位置信息用于确定对用户进行寻呼的位置或范围，该位 置信息可以是 LAC ( Location Area Code,位置区标识）信息或者 BSC标识信息， 并且该 BSC标识可以在接入网的区域范围内唯一标识 BSC , 例如该 BSC标识可 以在 A-Flex架构定义的区域范围内唯一标识 BSC。 通过采用存储模块， 将用户 寻呼区域信息存储在 HLR上。 当 MSC1/VLR1发生故障时， HLR的所述检测模 块检测到 MSC故障， 在注册在 MSC1/VLR1的用户进行被叫业务时， HLR的选 择模块根据策略为用户选择另一个 MSC2/VLR2继续被叫业务的处理； 当 HLR 发送清求到 MSC2/VLR2时， 发现存储模块中存有所述用户的寻呼区域信息， 则在业务处理模块或者信令处理模块的控制下在所述请求中携带该存储模块 中保存的用户的寻呼区域位置信息； MSC2/VLR2在后续需要寻呼用户或者使 用 Registration Request方法寻找用户时， 利用得到的寻呼区域位置信息缩小范 围。 在位置登记流程中， 如果用户所在寻呼区域信息发生变化， MSC/VLR则 发送携带有寻呼区域信息的 REGNOT( Registration Notice,登记通知响应消息） 请求给 HLR， HLR在业务处理模块或者信令处理模块的控制下保存更新该寻呼 区域位置信息到存储模块中。其中 REGNOT请求主要用于将用户的新位置信息 上报归属位置寄存器 HLR。 具体方法如前所述。
因此， 本发明系统、 设备和方法在实现容灾处理机制时， 尤其遇到 MSC/VLR发生故障的情况下， 通过 HLR选择 A-Flex区域中另一可用 MSC， 使 原先注册在目前瘫机的 MSC/VLR中的用户能正确进行被叫业务， 使得 CDMA2000网络电路域容灾方案更加完整， 并增强了系统的稳定性。 以上仅已 A-Flex机制为例进行说明， 对于 Iu-Flex机制同样适用， 具体过 程相同， 不再赘述。
应当理解的是，上述针对具体实施例的描述较为具体， 并不能因此而理解 为对本发明的专利保护范围的限制，本发明的专利保护范围应以所附权利要求 为准。

Claims

权 利 要 求
1、 一种应对移动交换节点故障的方法， 其用于包括至少一个基站控制 器、至少两个移动交换中心以及至少一个归属位置寄存器的系统中，其特征在 于， 该方法包括：
所述归属位置寄存器获知第一移动交换中心故障；
被叫业务请求方向所述归属位置寄存器提出请求，为被叫用户获取位置信 息，其中所述被叫用户注册在所述第一移动交换中心， 所述归属位置寄存器为 所述被叫业务请求方选择第二移动交换中心并向所述第二移动交换中心请求 位置信息；
所述第二移动交换中心返回所述位置信息给所述归属位置寄存器； 所述归属位置寄存器返回所述位置信息给所述被叫业务请求方；由所述被 叫业务请求方根据所述位置信息进行后续业务。
2、 根据权利要求 1所述的方法，其特征在于， 所述位置信息是被叫用户 的临时本地用户号码或为被叫用户提供服务的移动交换中心的标识。
3、 根据权利要求 1所述的方法，其特征在于， 所述归属位置寄存器根据 本地配置信息或从第一移动交换中心得到的互助移动交换中心信息进行所述 第二移动交换中心的选择。
4、 根据权利要求 1所述的方法，其特征在于，所述第二移动交换中心返 回所述位置信息给所述归属位置寄存器之前，第二移动交换中心在所连接的所 有基站控制器覆盖区域内寻呼所述被叫用户。
5、 根据权利要求 1所述的方法，其特征在于，所述被叫业务请求方接收 到所述位置信息后，还包括： 第二移动交换中心在所连接的所有基站控制器覆 盖区域内寻呼所述被叫用户。
6、 根据权利要求 1所述的方法， 其特征在于， 进一步包括： 所述归属位 置寄存器获取并保存寻呼区域信息 ,将所述寻呼区域信息发送给所述第二移动 交换中心；
所述第二移动交换中心返回所述位置信息给所述归属位置寄存器之前，第 二移动交换中心才艮据被叫用户的寻呼区域信息在所述区域内寻呼所述被叫用 户。
7、 根据权利要求 1所述的方法， 其特征在于， 进一步包括： 所述归属位 置寄存器获取并保存寻呼区域信息，将所述寻呼区域信息发送给所述第二移动 交换中心；
所述被叫业务请求方接收到所述位置信息后，还包括： 第二移动交换中心 根据被叫用户的寻呼区域信息， 在所述区域内寻呼所述被叫用户。
8、 根据权利要求 6或 7所述的方法， 其特征在于， 所迷寻呼区域信息是 基站控制器标识或位置区信息。
9、 根据权利要求 6或 7所述的方法， 其特征在于， 所述寻呼区域信息由 所述归属位置寄存器采用移动应用部分消息发送给所述第二移动交换中心。
10、 根据权利要求 6或 7所述的方法， 其特征在于， 所述寻呼区域信息由 所述归属位置寄存器采用移动应用部分消息发送给所述被叫业务请求方，所述 被叫业务请求方在入局消息中将所述寻呼区域信息带给所述第二移动交换中 心。
11、 根据权利要求 9所述的方法，其特征在于， 所述归属位置寄存器获取 所述寻呼区域信息的过程包括：
所述移动交换中心才艮据用户所在的寻呼区域信息变化，向所述归属位置寄 存器发送携带用户寻呼区域信息的位置更新消息。
12、 根据权利要求 12所述的方法， 其特征在于， 步 B1中所述移动交换 中心向所述归属位置寄存器上报的用户寻呼区域信息携带在移动应用部分位 置登记请求消息中。
13、 根据权利要求 1所述的方法，其特征在于， 所述归属位置寄存器向所 述笫二移动交换中心取所述位置信息时，在请求中还携带一表明需要所述第二 移动交换中心处理后续被叫业务的标志信息。
14、 一种应对移动交换节点故障的系统， 包括与一个归属位置寄存器连 接的至少两个移动交换中心； 其特征在于，
所述归属位置寄存器，用于获知所述至少两个移动交换中心中的第一移动 交换中心故障；接收来自被叫业务请求方的为被叫用户设备获取位置信息的请 求，为所述被叫业务请求方选择第二移动交换中心并向所述第二移动交换中心 请求所述位置信息，接收所述第二移动交换中心返回的位置信息，将所述位置 信息发送给被叫业务请求方。
15、 根据权利要求 14所述的系统， 其特征在于， 所述归属位置寄存器， 还用于获取并保存寻呼区域信息，将所述寻呼区域信息发送给所述第二移动交 换中心。
16、 一种应对移动交换节点故障的设备， 包括业务处理模块， 其特征在 于， 该设备还包括检测模块和选择模块；
所述检测模块， 用于检测所连接移动交换中心的状态，判断出某个移动交 换中心不可达时 , 将该移动交换中心的不可达信息进行记录；
所述业务处理模块，用于确定需要取被叫用户位置信息的移动交换中心故 障后， 通知所述选择模块进行重新选择； 根据所述选择模块返回的选择信息， 与所述另一非故障的移动交换中心进行交互；
所述选择模块， 用于根据接收到的通知，从所述检测模块所连接的所有移 动交换中心内选择另一非故障的移动交换中心，将所选择的移动交换中心通知 给业务处理模块。
17、 根据权利要求 16所述的设备， 其特征在于， 还包括： 信令处理模块、 操作维护模块和数据库，
所述信令处理模块，用于接收来自外部的请求消息， 将所述消息传送给所 述业务处理模块进行处理；与所述业务处理模块配合与所述另一非故障的移动 交换中心进行交互；
所述操作维护模块， 用于在信令处理模块的控制下， 将操作维护信息通知 给所述检测模块；
所述数据库， 用于记录移动交换中心的不可达信息及通信所需相应数据。
18、 根据权利要求 16所述的设备， 其特征在于， 所述设备还包括用于存 储用户寻呼区域信息的存储模块，所述存储模块设置在数据库模块中或独立设 置， 至少与业务处理模块相连接。
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