WO2007112644A1 - Procédé de récupération d'appel pendant une défaillance de réseau et système associé - Google Patents

Procédé de récupération d'appel pendant une défaillance de réseau et système associé Download PDF

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Publication number
WO2007112644A1
WO2007112644A1 PCT/CN2007/000460 CN2007000460W WO2007112644A1 WO 2007112644 A1 WO2007112644 A1 WO 2007112644A1 CN 2007000460 W CN2007000460 W CN 2007000460W WO 2007112644 A1 WO2007112644 A1 WO 2007112644A1
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WO
WIPO (PCT)
Prior art keywords
mobile switching
switching center
user
call
msc
Prior art date
Application number
PCT/CN2007/000460
Other languages
English (en)
French (fr)
Inventor
Jun Fang
Sihai Ye
Yan Ding
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 EP07710889A priority Critical patent/EP2003913B1/en
Publication of WO2007112644A1 publication Critical patent/WO2007112644A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/04Arrangements for maintaining operational condition
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/30Network data restoration; Network data reliability; Network data fault tolerance
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14Backbone network devices

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a call recovery method and system in the event of a network failure.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • RNC Radio Network Controller
  • BSC Base Station System Controller
  • MSC Mobile Switching Center
  • the Iu-Flex/A-Flex technology was proposed.
  • an RNC or a BSC can be connected to multiple MSCs at the same time to form a resource pool. In this way, a large-area service interruption occurs in the case of a single MSC failure, and MSC load sharing and resource sharing in the pool can be realized.
  • FIG. 1 is a schematic diagram of the Iu-Flex networking structure in the prior art.
  • FIG. 1 is a schematic diagram of the Iu-Flex networking structure in the prior art.
  • four RNCs are connected to three MSCs.
  • the call needs to be transferred to another normal MSC.
  • FIG. 1 is a schematic diagram of the Iu-Flex networking structure in the prior art.
  • the calling direction home location register HLR issues a request routing message; if the location is saved in the HLR The message is MSC1, but if MSC1 fails at this time, and the HLR still sends a message requesting the provisioning roaming number to the failed MSC1, the calling user will fail.
  • the call can be successful only after the user has made a location update, for example, the user re-registers with another MSC (MSC2).
  • Location updates include caller updates and periodic updates.
  • the caller update refers to a location update initiated by the user, for example, a location update request that occurs after the user moves from one cell to another, or the user makes a calling service, such as calling or sending a short message; Means automatically initiated by the user after a predetermined period of time Location update.
  • MSC Mobility Management Entity
  • the time that the corresponding user cannot be successfully called is up to the periodic location update time.
  • the location information in the HLR is updated, and the HLR sends a message requesting the provision of the roaming number to the normal MSC2, and the call to the corresponding user can be successful.
  • the technical problem to be solved by the embodiment of the present invention is to provide a call recovery method and system in the event of a network failure, so as to solve the problem in the prior art that the mobile switching center fails when the called user of the mobile switching center does not perform location update. , the user cannot make a call.
  • an embodiment of the present invention provides a call recovery method in the event of a network failure, including the steps of:
  • the roaming number request message is sent to the normal mobile switching center through the alternate path;
  • the normal mobile switching center acquires location area information of the called user
  • the embodiment of the present invention further provides a call recovery system in the event of a network failure, the system includes: a switching unit and a mobile switching center, where the switching unit is configured to provide a roaming number request through an alternate path. The message is sent to the normal mobile switching center;
  • the mobile switching center is connected to the switching unit, acquires location area information of the called user according to the request message, performs pre-paging in the user location area, and updates the user data after receiving the pre-paging response, and passes the The path returns the roaming number to complete the subsequent call.
  • the embodiment of the present invention further provides a call recovery method in the event of a network failure, including the steps of: After the called mobile switching center fails, the roaming number request message is sent to the first visited location register through the alternate path;
  • the visited location registration selects a normal mobile switching center, and assigns a roaming number to the normal mobile switching center; and returns a roaming number through a path with the normal mobile switching center to complete a subsequent call.
  • the embodiment of the present invention further provides a call recovery system in the event of a network failure, comprising: an switching unit, a first visited location register, and a mobile switching center, wherein the switching unit is configured to use an alternate path Providing a roaming number request message to the first visitor location register; the first visitor location register is connected to the switching unit, configured to select a normal mobile switching center according to the received request message, and allocate the mobile switching center to the mobile switching center The roaming number; the mobile switching center is connected to the first visited location register, and is configured to complete the subsequent call of the called user according to the received roaming number.
  • the called service of the user corresponding to the faulty MSC is switched to the normal MSC for execution, and thus is not affected by the faulty MSC, and the user may be solved after the original MSC fault. It can take up to several hours to recover the called party.
  • FIG. 1 is a schematic structural diagram of a prior art Iu-Flex networking
  • FIG. 2 is a schematic diagram of a called process after a failure of a mobile switching center in the Iu-Flex in the prior art
  • FIG. 3 is a flowchart of a method for calling a network failure according to an embodiment of the present invention
  • FIG. 4 is a specific flowchart of a call method in the network failure described in FIG. 3;
  • FIG. 5 is a structural diagram of a call system in the event of a network failure according to an embodiment of the present invention.
  • 6a is a flowchart of a user data backup process in an embodiment of the present invention.
  • 6b is a flowchart of acquiring user data in an embodiment of the present invention.
  • FIG. 7 is a structural diagram of a call system in the event of a network failure according to another embodiment of the present invention
  • FIG. 8 is a flowchart of a method for calling in the event of a network failure according to another embodiment of the present invention
  • FIG. 9 is a specific flowchart of a method for calling in the event of a network failure as described in FIG.
  • FIG. 3 is a flowchart of a method for calling in the event of a network failure according to an embodiment of the present invention.
  • the method includes:
  • Step 301 Configure a path between multiple mobile switching centers, where the path includes a primary path to the called mobile switching center and an alternate path to other mobile switching centers;
  • Step 302 After the called mobile switching center fails, send the roaming number request message to the normal mobile switching center through the alternate path.
  • Step 303 The normal mobile switching center acquires the location area information of the called user.
  • Step 304 Perform pre-paging of the location information of the called user.
  • Step 305 Update user data after receiving the pre-paging response fed back by the user;
  • Step 306 Complete the subsequent call by returning the roaming number through the path between the normal mobile switching center.
  • the embodiment of the present invention provides a technical solution for call recovery in the event of an Iu-Flex or A-Flex networking failure, such that the MSC in the network fails and the user in the failed MSC does not perform location update for a long period of time.
  • the HLR can immediately find a normal MSC, and the normal MSC pages the called user of the failed MSC to implement the called procedure of the user, thereby solving the problem that the user after the MSC failure may not be called for a long time.
  • the Iu-Flex networking is discussed as an example, but for the A-Flex networking mode, the same applies to the present invention.
  • the A-Flex networking mode only the RNC is replaced with the BSC.
  • the other structure is similar to the Iu-Flex networking mode.
  • FIG. 4 is a specific flowchart of the calling method in the network fault described in FIG. 3 .
  • the signaling switching point STP has been configured with paths to all mobile switching centers (e.g., MSC1, MSC2, MSC3, MSC4 in FIG. 5). That is, if the path to the called mobile switching center is the primary path, the path to the other switching switching center is the alternate path.
  • the calling user initiates a call to the user corresponding to MSC1, so the path from STP to MSC1 is taken as the primary path, and STP is sent to MSC2, MSC3, MSC4 (for MSC3, The path not shown in the MSC4 diagram, the same below) is the alternate path.
  • the communication path preferably selects the HLR_STP1_MSC1 to transmit data, and the path HLR-STP-MSC2 , HLR - STP - MSC3, HLR - STP - MSC4 as an alternate path.
  • the MSC1 is working normally, the above alternate path is not enabled.
  • the case of discussing the alternate path of STP to MSC2 is taken as an example.
  • a request for PRN (providing a roaming number) is sent from the HLR to the STP.
  • the STP After receiving the PR request, the STP first analyzes the PRN request, includes the information of the target signaling point in the PRN request message, analyzes the target signaling point information, and determines which mobile switching center is the target signaling point, when moving.
  • the switching center MSC1 fails and cannot be accessed, the STP to MSC1 main path cannot be used. Since then, STP has been configured with alternate paths to other mobile switching centers (such as MSC2). Then, the STP can send the PRN request to the other normal mobile switching center through the alternate path, such as the mobile switching center MSC2 (ie, step 401).
  • step 402 after receiving the PRN request message forwarded by the STP, the MSC2 needs to
  • the target signaling point information included in the PRN request message is analyzed. After analyzing, it is determined that the target signaling point of the request message is not the normal mobile switching center MSC2, and the MSC2 is enabled as a non-primary signaling point.
  • a multi-signaling point technology is adopted, that is, when an MSC has no fault and operates as a target signaling point to be called, the signaling point works as a primary signaling point, and when other When a certain MSC fails and the MSC needs to work in place of the failed MSC, the normal MSC operates as a non-primary signaling point.
  • the MSC2 needs to obtain the location area information of the called user.
  • the MSC 2 may retrieve the location area information of the called user in the VLR data backup unit, and read the location area information of the called user from the VLR data backup unit.
  • the method for obtaining the location area information of the called user may further be: the VLR data backup unit sends the user location area information stored therein to the MSC2 at predetermined time intervals.
  • the MSC2 After obtaining the location area information of the called user, the MSC2 starts a pre-paging in the corresponding location area to obtain user data. Specifically, in step 404, the MSC2 first sends a paging message in the location area and then waits for a page response from the called client. At the same time, according to the agreement, in the wireless network controller
  • the correspondence between the normal MSC and the subscriber number is recorded in (RC), for example, the correspondence between the CN-ID and the IMSI is recorded in the RNC.
  • the called user in the location area receives the call of the MSC2, sends a paging response to the radio network controller; after receiving the user paging response forwarded by the RNC, in step 406, the normal The MSC 2 assigns a TMSI (Temporary User Identity) to the user so that the called user can log in to the mobile communication network through the TMSI.
  • TMSI Temporal User Identity
  • the MSC2 After the TMSI allocation is completed, in step 407, the MSC2 returns a location update message to the home location register HLR. After receiving the location update message, the HLR inserts the user data into the normal MSC2 in step 408, and updates the relevant MSC number in the HLR. At step 409, the HLR returns to the MSC 2 to accept the location update information.
  • TMSI Temporal User Identity
  • step 410 the normal MSC returns a roaming number to the HLR, so that a subsequent call to the called user can be completed according to the roaming number, thereby implementing a call to the user in the failed MSC1.
  • the roaming number is also notified to the calling user to complete the call of the subsequent process, which is an existing WCDMA, CDMA, TD-CDMA, GSM, etc. communication system.
  • the standard paging process the specific process is well known to those skilled in the art, and therefore will not be further described herein.
  • FIG. 5 is a structural diagram of a call recovery system in the event of a network failure according to an embodiment of the present invention.
  • the call recovery system includes: a home location register 51, a switching unit 52, a plurality of mobile switching centers 53, and a data backup unit 54.
  • the switching unit 52 is configured to configure a path between the home location register 51 and the plurality of mobile switching centers 53 (including a primary path to the called mobile switching center and an alternate path to other mobile switching centers), and when detecting After the called mobile switching center fails, the provided roaming number request message from the home location register is sent to the normal mobile switching center through the alternate path.
  • the switching unit 52 is implemented by the signaling transfer point STP, and may also be implemented by a corresponding software module or hardware control logic, which is well known to those skilled in the art. No longer.
  • the STP has a signaling transfer function, which can forward signaling messages from one signaling point to another.
  • the signaling transfer point STP 52 receives signaling from the home location register HLR 51, for example, providing a roaming number request message.
  • the home location register HLR 51 For example, providing a roaming number request message.
  • Each mobile user must be registered on the location register HLR to which it belongs.
  • Providing a roaming number request message is used by the calling user to the called party
  • the message is sent by the calling user to the home location register HLR, and the HLR needs to send the request message to the corresponding mobile switching center MSC, so as to obtain the roaming of the called user after the MSC performs paging.
  • the number so that the call can be completed.
  • the provisioning roaming number request message is first sent to the signaling transfer point STP52 located between the HLR and the plurality of MSCs, and the message is forwarded by the STP 52.
  • STP has set a path with multiple MSCs.
  • the mobile switching center MSC 53 (shown as MSC1, MSC2, MSC3, and MSC4 in the figure) is connected to the signaling exchange point STP52, and is configured to obtain location area information of the called user by communicating with the data backup unit, and in the user. Paging in the location area to obtain the location information of the user.
  • a path is established between the four mobile switching centers and the signaling transfer point STP.
  • the path between the STP and the MSC1 is the primary path
  • the path between the STP and the MSC2, the MSC3, and the MSC4 is the alternate path.
  • a communication path is established between STP and MSC1, MSC2, MSC3, MSC4.
  • the communication path preferably selects HLR-STP-MSC1 to transmit data (ie, the solid path in the figure), and the paths HLR-STP-MSC2, HLR-STP-MSC3, HLR-STP-MSC4 serve as alternate paths (ie, in the figure) Dotted path).
  • the above alternate path is not enabled when MSC1 is operating normally.
  • the above four mobile switching centers are all connected with the data backup unit 54, so that the location area information of the user can be read from the data backup unit through a predetermined communication protocol, and the user location information in each mobile switching center can also be backed up in real time. Go to the data backup unit 54.
  • the data backup unit 54 is connected to the mobile switching center 53 and is configured to store user data of a plurality of mobile switching centers.
  • the data backup unit 54 may be implemented by a visitor location register (VLR), which is a database connected to one or more mobile switching centers, which holds the mobile exchanges. The information of all mobile users in each cell covered by the center in the home location register is backed up, dynamically storing the visiting user information, such as location area information, located in its jurisdiction.
  • VLR visitor location register
  • the data backup unit 54 is a database of user locations and management information stored in the relevant MSC area, and the data backup unit establishes a communication connection with a plurality of mobile switching centers MSC in the network.
  • the data backup unit may also be a VLR data backup unit.
  • the data backup unit may be in the following forms: an independent physical entity, an entity distributed in the MSC, and a logical entity concurrent with the VLR in the MSC. That is, the VLR data backup unit may be a register unit that exists independently in the network, such as a separate database server in the network. It may also be a register unit located in a single or multiple MSCs, or a VLR in the MSC, such as a portion of the resources in the VLR as a data backup unit. Letter form, for example: Signaling No. 7, IP communication, etc. Moreover, the VLR data backup unit backup object includes: user data in a single MSC or multiple MSCs in the network.
  • FIG. 6a is a flowchart of user data backup in the embodiment of the present invention
  • FIG. 6b is a flowchart of acquiring user data in the embodiment of the present invention.
  • the user data in all MSCs in the pool is saved by using the VLR data backup unit.
  • the user data includes: a user identifier, location information, a user status, and the like. However, it is not limited to the above information, and the user data may include various information related to the called user.
  • the MSC must use the whole network paging method to obtain user data in order to obtain user information.
  • the paging range may be that the entire city gets a larger range, which will increase the network. Big load.
  • the mobile switching center MSC can obtain the location area information of the user from the VLR data backup unit, and can page the called user in a designated area to obtain user data update, thereby avoiding Perform network-wide paging on the called user.
  • the data obtained by each mobile switching center MSC can be backed up to the VLR data backup unit in real time.
  • the data obtained by the mobile switching center can also be backed up to the VLR data backup unit at predetermined time intervals (e.g., 5 minutes).
  • the mobile switching center MSC sends a backup user data request to the VLR data backup unit.
  • the VLR data backup unit sends a backup user data request response message to the MSC.
  • the MSC backs up the user data into the VLR data backup unit through a predetermined communication manner between the MSC and the VLR data backup unit, for example, the seventh signaling.
  • Backup of user data can be backed up in real time or at predetermined intervals, the real time backup is in the MSC
  • the user data is backed up and stored. For example, in order to reduce the system load, the backup can also be performed at a certain time interval, and the specific time interval can be selected according to the network system condition.
  • the system starts the user data acquisition process.
  • the MSC sends a user location information request to the VLR data backup unit, and after receiving the user location information request, the VLR data backup unit sends a user location information response to the MSC.
  • the MSC reads the user data stored in the VLR data backup unit through a predetermined communication method between the MSC and the VLR data backup unit, for example, the seventh signaling.
  • FIG. 7 is a structural diagram of a call system in the event of a network failure according to another embodiment of the present invention.
  • the MSC and the visitor location register (VLR) are generally arranged in one device, one MSC corresponds to one VLR, and the MSC and the VLR communicate through the internal interface.
  • the VLRs in the resource pool are collectively set, and multiple MSCs share the VLR, and the VLR performs user data backup.
  • the VLR can select a normal MSC to assign a roaming number to complete the called service. Its networking is shown in Figure 7.
  • the home location register HLR 71, the switching unit 72, the first visited location register 73, the mobile switching center 74, and the second visited location register 75 are further included.
  • the switching unit 72 is configured to configure a path between the plurality of mobile switching centers, and send a providing roaming number request message to the first visited location register.
  • the switching unit is implemented by the signaling transfer point STP, or alternatively by a corresponding software module or hardware control logic.
  • the STP has a signaling transfer function that can forward signaling messages from one signaling point to another.
  • the switching unit 72 receives signaling from the home location register HLR 71, for example, providing a roaming number request message.
  • Each mobile user must be registered on the location register HLR to which it belongs.
  • Providing the roaming number request message is generated when the calling user places a call to the called user.
  • the message is sent by the calling user to the home location register HLR, and the HLR needs to send the request message to the visited location register VLR, by visiting the location.
  • the register VLR selects an MSC (such as MSC2 in the figure) to enable subsequent calls to be completed.
  • MSC such as MSC2 in the figure
  • the first visit location register 73 is connected to the switching unit 72 (using a signaling switching point as an example) for selecting a normal mobile switching center and assigning a roaming number to the normal mobile switching center.
  • the first visit location register is implemented by centrally setting VLRs in the resource pool.
  • the VLR is set corresponding to each MSC, and each VLR backs up user data in the corresponding MSC.
  • the centrally set VLR can record user data in all MSCs in the resource pool to complete paging.
  • a second visit location register 75 is also included.
  • the second visit location register 75 is set as a backup device of the first visit location register.
  • the first visit location register ie, the primary VLR
  • the second visit location register ie, the standby VLR
  • the location register is operated, and the connection relationship is the same as that of the first visit location register, and details are not described herein again.
  • the mobile switching center 74 is respectively connected to the signaling exchange point 72 and the first visited location register 73 and the second visited location register 75 for obtaining the location area information of the called user by communicating with the data backup unit, and at the user location. Paging in the zone to obtain the location information of the user.
  • a path is established between the four mobile switching centers and the signaling transfer point STP, the first visited location register, and the second visited location register.
  • FIG. 8 is a flowchart of a call method in the event of a network failure according to an embodiment of the present invention.
  • the method includes:
  • Step 801 Configure a path between multiple mobile switching centers, where the path includes a primary path to the called mobile switching center and an alternate path to other mobile switching centers;
  • Step 802 After the called mobile switching center fails, send a roaming number request message to the first visited location register through the alternate path;
  • Step 803 The visited location registration selects a normal mobile switching center, and assigns a roaming number to the normal mobile switching center.
  • Step 804 Complete the subsequent call by returning the roaming number through the path between the normal mobile switching center.
  • step 901 the HLR sends a roaming number request message to the VLR because the calling user initiates a call to the user in the network.
  • the VLR needs to know whether the called mobile switching center is faulty. Therefore, in step 902, it determines the available state of the called MSC, that is, by actively detecting and acquiring related information to determine whether the MSC is faulty.
  • the VLR can actively determine whether the MSC fault is available.
  • the handshake mechanism is used to determine the state of the MSC: a handshake mechanism is established between the VLR and the MSC, and the MSC fault is obtained when the handshake operation fails.
  • the fault condition of the MSC can be judged by the link state. For example, when the link state information between the MSC signaling points is unreachable, the VLR learns that the MSC has failed.
  • the VLR can also obtain whether the MSC is faulty through some means, for example: Not notified by the network management system
  • An MSC fault of the VLR can be automatic notification or manual notification by the network management system); or notify the VLR of an MSC failure through other network elements (such as other normal MSCs in the resource pool).
  • the HLR After the VLR learns that the MSC1 is faulty, if the user of the failed MSC1 is called, the HLR sends a roaming number request message to the VLR.
  • the VLR assigns a roaming number to other normal MSCs (e.g., MSC2), and then in step 905, the VLR has The roaming number of the MSC2 identification information is returned to the HLR, and the HLR returns a routing request message to the Gateway Mobile Switching Center (GMSC). Therefore, the GMSC can establish a subsequent connection process with the MSC2 to complete the called process of the user.
  • the process of the subsequent call is a standard paging procedure of the existing communication systems of WCDMA, CDMA, TD-CDMA, GSM, etc., and the specific procedures are well known to those skilled in the art, and therefore will not be further described herein.
  • the VLR needs to select an MSC from all normal MSCs for roaming number assignment and call user operations.
  • the method for the VLR to select a normal MSC from the resource pool may be various suitable algorithms, for example: randomly selecting one MSC among all normal MSCs in the resource pool, or selecting one MSC by using a round robin method. Taking the round-robin method as an example, if MSC2 works as a standby mobile switching center in the last fault, when a certain MSC in the network fails again after a period of time, according to the serial number, MSC3 should be selected as the backup.
  • the mobile switching center at this time, if the MSC3 can work normally, the MSC3 is enabled to work. If the MSC3 is the failed mobile switching center, the MSC4 is continuously selected as the standby mobile switching center.
  • the method for selecting a normal MSC by the VLR further includes: selecting the MSC with the smallest load according to the load condition of the MSC. Selecting the MSC with the least load is more advantageous for load sharing and balancing the load between the MSCs.
  • the VLR can also select a normal MSC by static configuration.
  • the static configuration refers to the fixed configuration of the alternative working relationship of some MSCs. That is, when a specified MSC fails, the VLR selects a predetermined MSC to replace its work.
  • the MSC3 is configured as an alternate mobile switching center of the MSC1. When it is detected that the MSC1 fails, the MSC3 is enabled to make a call to the user in the MSC1.
  • the called service of the user corresponding to the faulty MSC is switched to the normal MSC for execution, so that it is not affected by the faulty MSC, and the user may be the longest after the original MSC fault is solved. It takes a few hours to recover the called party.
  • the data backup unit is adopted in the call recovery system of the embodiment of the present invention, the user information is searched through the whole network paging, thereby improving the network operation efficiency.

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Description

在网络故障时的呼叫恢复方法及系统 本申请要求于 2006 年 3 月 31 日提交中国专利局、 申请号为 200610067004.7, 发明名称为 "在网络故障时的呼叫恢复方法及系统"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, 尤其涉及一种在网络故障时的呼叫恢复方法 及系统。
背景技术
在传统全球移动通信系统(GSM ) /通用移动通信系统(UMTS )组网情 况下,一个无线网络控制器(RNC )或一个基站系统控制器(BSC )只能连接 一个移动交换中心(MSC )。 随着软交换架构的发展, 在无线通信系统中越来 越多地采用大容量的网絡, 安全性已经成为运营商越来越关注的问题, 如何 避免单点故障下大面积的业务中断, 是每个设备商面临的问题。
在 3GPP R5阶段, 提出了 Iu-Flex/A-Flex技术。 在 Iu-Flex/A-Flex组网技 术中,一个 RNC或一个 BSC可以同时和多个 MSC相连接,从而组成资源池。 这样既可以避免单个 MSC故障的情况下出现大面积的业务中断,还可以实现 池内 MSC负荷分担、 资源共享。
请参阅图 1 , 为现有技术中 Iu-Flex组网结构示意图。 如图 1所示, 在一个 Iu-Flex组网中, 四个 RNC与三个 MSC连接, 当其中一个 MSC出现故障后, 需 要将呼叫转移到其它的正常 MSC上进行。如图 2 所示,为现有技术中在 Iu-Flex 中移动交换中心发生故障后的被叫过程示意图, 其实现过程为: 主叫方向归 属位置寄存器 HLR发出请求路由消息; 如果 HLR中保存的位置信息为 MSC1 , 但如果此时 MSC1发生故障,而 HLR仍然将请求提供漫游号码的消息发往故障 的 MSC1 , 则会导致呼叫用户失败。
但是, 对于目前的现有技术中, 只有当用户作了位置更新后, 例如用户 在其它的 MSC ( MSC2 ) 重新注册, 呼叫才能成功。 位置更新包括主叫更新 和周期性更新。 其中, 主叫更新是指由用户发起的位置更新, 例如用户从一 个小区移动到另一个小区后发生的位置更新请求, 或用户作了主叫业务, 如 呼叫或发送短消息等; 周期性更新是指间隔预定的时间段后用户自动发起的 位置更新。 在现有技术中, 当一个 MSC发生故障, 对相应的用户无法呼叫成 功的时间最长等于周期性位置更新时间。 用户只有在作了主叫更新或周期性 位置更新后, HLR中的位置信息得到更新, HLR将请求提供漫游号码的消息 发往正常的 MSC2, 对相应用户的呼叫才可以成功。
从上述方案可以看出, 当一个移动交换中心发生故障, 而且此移动交换 中心的被叫用户未作位置更新时, 在位置更新时间周期内, 用户无法作被呼 叫
发明内容
本发明实施例解决的技术问题是提供一种在网络故障时的呼叫恢复方法 及系统, 以解决目前技术中在移动交换中心发生故障, 而此时移动交换中心 的被叫用户未作位置更新时, 该用户无法作被呼叫的问题。
为解决上述技术问题, 本发明实施例提供一种在网络故障时的呼叫恢复 方法, 包括步骤:
当被叫移动交换中心故障后 , 通过备用路径将提供漫游号码请求消息发 送到正常的移动交换中心;
所述正常移动交换中心获取被叫用户的位置区信息;
根据所述被叫用户的位置信息进行预寻呼;
在收到该用户反馈的预寻呼响应后更新用户数据;
通过与正常移动交换中心之间的路径返回漫游号码, 完成后续呼叫。 另外, 本发明实施例还提供了一种在网络故障时的呼叫恢复系统, 该系 统包括: 转接单元和移动交换中心, 其中, 所述转接单元, 用于通过备用路径将提供漫游号码请求消息发送到正常 的移动交换中心;
所述移动交换中心, 与转接单元相连, 根据所述请求消息获取被叫用户 的位置区信息, 在用户位置区中进行预寻呼, 并收到预寻呼响应后更新用户 数据, 以及通过该路径返回漫游号码, 完成后续呼叫。 此外, 本发明实施例还提供了一种在网絡故障时的呼叫恢复方法, 包括 步骤: 当被叫移动交换中心故障后, 通过备用路径将提供漫游号码请求消息发 送到第一拜访位置寄存器;
所述拜访位置寄存选择正常的移动交换中心, 并为所述正常移动交换中 心分配漫游号码; 通过与正常移动交换中心之间的路径返回漫游号码, 完成后续呼叫。 最后, 本发明实施例还提供了一种在网络故障时的呼叫恢复系统, 包括: 转接单元、 第一拜访位置寄存器和移动交换中心, 其中, 所述转接单元, 用于通过备用路径将提供漫游号码请求消息发送到第一 拜访位置寄存器; 所述第一拜访位置寄存器, 与转接单元相连, 用于根据接收到的请求消 息选择正常的移动交换中心, 并为所述移动交换中心分配漫游号码; 所述移动交换中心, 与第一拜访位置寄存器相连, 用于才艮据接收到的漫 游号码完成被叫用户的后续呼叫。 通过本发明实施例提供的方法及系统, 网络发生故障后, 故障 MSC所对 应用户的被叫业务被转换到正常的 MSC执行, 因此不受故障 MSC的影响, 解决了原来 MSC故障后,用户可能最长需要几个小时才能重新恢复被叫的问 题。
附图说明
图 1是现有技术 Iu-Flex组网结构示意图;
图 2是现有技术在 Iu-Flex 中移动交换中心发生故障后的被叫过程示意 图;
图 3是本发明实施例所述在网络故障时的呼叫方法的流程图;
图 4是图 3所述在网络故障时的呼叫方法的具体流程图;
图 5是本发明实施例所述在网络故障时的呼叫系统的结构图;
图 6a是本发明实施例中用户数据备份流程的流程图;
图 6b是本发明实施例中获取用户数据的流程图;
图 7是本发明另一个实施例的在网络故障时的呼叫系统的结构图; 图 8是本发明另一个实施例的在网络故障时的呼叫方法的流程图; 图 9是图 8所述在网络故障时的呼叫方法的具体流程图。
具体实施方式
下面结合附图和实施例对本发明作进一步的说明。
请参阅图 3, 为本发明实施例所述在网络故障时的呼叫方法的流程图。所 述方法包括:
步骤 301: 配置到多个移动交换中心之间的路径, 其中, 所述路径包括到 被叫移动交换中心的主路径和到其它移动交换中心的备用路径;
步骤 302: 当被叫移动交换中心故障后,通过所述备用路径将提供漫游号 码请求消息发送到正常的移动交换中心;
步骤 303: 所述正常移动交换中心获取被叫用户的位置区信息; 步骤 304: 居所述被叫用户的位置信息进行预寻呼;
步骤 305: 在收到该用户反馈的预寻呼响应后更新用户数据;
步骤 306: 通过与正常移动交换中心之间的路径返回漫游号码, 完成后续 呼叫。
本发明实施例所提供在 Iu-Flex或 A-Flex组网故障时呼叫恢复的技术方 案, 使得在网络中 MSC出现故障而且故障 MSC中的用户在很长一段时间内 没有进行位置更新的情况下, HLR可以立即找到一个正常的 MSC, 并且由这 个正常 MSC寻呼到故障 MSC的被叫用户, 实现该用户的被叫过程, 从而解 决了 MSC故障后的用户可能长时间不能被呼叫的问题。
在本发明的实施例中,以 Iu-Flex组网作为示例进行讨论,然而对于 A-Flex 组网方式, 同样适用于本发明。 在 A-Flex组网方式中, 只是将 RNC替换为 BSC , 其他结构形式与 Iu-Flex组网方式近似。
请参阅图 4, 为图 3所述在网络故障时的呼叫方法的具体流程图。 如图 4 所示, 在步骤 401, 信令交换点 STP 已经配置了到所有移动交换中心 (例如 图 5 中 MSC1、 MSC2、 MSC3、 MSC4 ) 的路径。 也就是说, 如果到被叫的 移动交换中心的路径为主路径, 则到其它移送交换中心的路径为备用路径。 在本实施例中, 主叫用户向 MSC1 所对应的用户发起呼叫, 因此将 STP 到 MSC1的路径作为主路径, 而将 STP到 MSC2、 MSC3、 MSC4 (对于 MSC3、 MSC4图中未示, 下同) 的路径为备用路径。
如上所述, 在移动交换中心 MSC1、 MSC2、 MSC3、 MSC4均能够正常 工作且主叫用户呼叫 MSC1 中的用户时, 通信路径优选地选择 HLR— STP1 — MSC1 传输数据, 而路径 HLR-STP-MSC2, HLR— STP— MSC3、 HLR — STP—MSC4作为备用路径。 当在 MSC1正常工作的时候, 上述备用路径不 启用。 另外, 为方便描述, 这里以讨论 STP到 MSC2的备用路径的情况为例。
如图 4所示,当主叫用户向 MSC1所对应的被叫用户发起呼叫后,从 HLR 向 STP发送 PRN (提供漫游号码)请求。 STP接收到 PR 请求后,首先对 PRN 请求进行分析, 在 PRN请求消息中包括目标信令点的信息, 分析所述目标信 令点信息, 以确定哪个移动交换中心为目标信令点, 当移动交换中心 MSC1 出现故障不能访问时, STP到 MSC1 的主路径则不能使用。 由于在此之前, STP已经配置了到其他移动交换中心 (比如 MSC2 ) 的备用路径。 则 STP可 以将 PRN请求通过备用路径发送到其他正常的移动交换中心, 例如移动交换 中心 MSC2 (即步骤 401 )。
在步驟 402中, 当 MSC2收到 STP转发来的 PRN请求消息后, 需要对
PRN请求消息中所包括的目标信令点信息进行分析, 经过分析, 确定该请求 消息的目标信令点并非所述正常的移动交换中心 MSC2, 则 MSC2作为非主 用信令点启用。 在本发明实施例中, 采用的是多信令点技术, 即当一个 MSC 没有故障并且是作为被呼叫的目标信令点工作时, 该信令点作为主用信令点 工作, 而当其他的某个 MSC发生故障、 需要此 MSC代替故障 MSC进行工 作时, 该正常 MSC则作为非主用信令点工作。
此时, MSC2中并没有相应的被叫用户数据, 因此, MSC2需要获得被叫 用户的位置区信息。 在步骤 403中, MSC2可以在 VLR数据备份单元中检索 被叫用户的位置区信息, 并且从 VLR数据备份单元读取被叫用户的位置区信 息。 可选择地, 获取被叫用户位置区信息的方法还可以是: VLR数据备份单 元以预定时间间隔向 MSC2发送其中存储的用户位置区信息。
在获取被叫用户的位置区信息后, MSC2在相应的位置区中启动预寻呼, 以得到用户数据。 具体地, 在步骤 404, MSC2首先在位置区下发寻呼消息, 然后等待来自被叫客户的寻呼响应。 同时, 根据协议, 在无线网络控制器 ( R C ) 中记录所述正常 MSC与用户号码之间的对应关系, 例如在 RNC中 记录 CN-ID和 IMSI的对应关系。 其中, 当在步骤 405, 该位置区中的被叫用 户接收到 MSC2的呼叫后, 向无线网络控制器中发送寻呼响应; 在收到 RNC 转发的用户寻呼响应后, 在步驟 406, 正常的 MSC2向用户分配 TMSI (临时 用户标识), 以便被叫用户能够通过 TMSI来登录移动通信网络。 在 TMSI分 配完成后, 在步骤 407, MSC2向归属位置寄存器 HLR返回位置更新消息, HLR收到位置更新消息后, 在步骤 408, 向正常 MSC2中插入用户数据, 并 且更新 HLR中的相关 MSC号码, 在步骤 409, HLR向 MSC2返回接受位置 更新信息。 从而完成位置更新过程。 之后, 在步骤 410, 正常 MSC向 HLR 返回漫游号码, 从而可以根据所述漫游号码完成对被叫用户的后续呼叫, 从 而实现对故障 MSC1中用户的呼叫。
在 HLR获得被叫用户的漫游号码后, 还要将该漫游号码通知主叫用户, 以便完成后续过程的呼叫, 该后续呼叫的过程是现有的 WCDMA、 CDMA, TD-CDMA、 GSM等通信系统的标准寻呼流程, 具体流程为本领域技术人员 所熟知, 因此这里不作进一步的描述。
还请参阅图 5, 为本发明实施例的在网络故障时的呼叫恢复系统的结构 图。 如图所示, 该呼叫恢复系统包括: 归属位置寄存器 51、 转接单元 52、 多 个移动交换中心 53和数据备份单元 54。
所述转接单元 52, 用于配置归属位置寄存器 51到多个移动交换中心 53 之间的路径 (包括到被叫移动交换中心的主路径和到其它移动交换中心的备 用路径), 并且当检测到被叫移动交换中心故障后, 通过所述备用路径将来自 归属位置寄存器的提供漫游号码请求消息发送到正常移动交换中心。 在本实 施例中,转接单元 52是通过信令转接点 STP来实现的,也可以通过相应的软 件模块或硬件控制逻辑来实现, 这对于本领域技术人员来说为公知技术, 在 此不再赘述。 所述 STP具有信令转接功能, 它可以将信令消息从一个信令点 转发到另一个信令点。
具体如图 5所示, 信令转接点 STP52接收来自归属位置寄存器 HLR51 的信令, 例如, 提供漫游号码请求消息。 每个移动用户都必须在其所归属的 位置寄存器 HLR上注册登记。提供漫游号码请求消息是在主叫用户向被叫用 户发出呼叫时产生的, 该消息由主叫用户向归属位置寄存器 HLR发送, 则 HLR需要将该请求消息发送到相应的移动交换中心 MSC, 以便在 MSC进行 寻呼后能够获取被叫用户的漫游号码, 从而能够完成呼叫。 在本实施例中, 首先要将提供漫游号码请求消息发送到位于 HLR和多个 MSC之间的信令转 接点 STP52, 由 STP52完成消息的转发。 其中, STP已经设置了与多个 MSC 之间的路径。
所述移动交换中心 MSC53(图中以 MSC1、MSC2、MSC3和 MSC4所示), 与信令交换点 STP52相连, 用于通过与数据备份单元进行通信获取被叫用户 的位置区信息, 以及在用户位置区中进行寻呼以获取用户的位置信息。 如图 所示,在本实施例中, 具有四个移动交换中心 MSC1、 MSC2、 MSC3、 MSC4。 所述四个移动交换中心与信令转接点 STP之间都建立了路径。 其中, 当主叫 用户呼叫 MSC1中的用户时, 则 STP与 MSC1之间的路径为主路径, 而 STP 与 MSC2、 MSC3、 MSC4之间的路径为备用路径。
在所有移动交换中心正常且主叫用户呼叫 MSC1中的用户时,如图所示, 在 STP与 MSC1、 MSC2、 MSC3、 MSC4之间都建立了通信路径。 其中, 通 信路径优选地选择 HLR—STP— MSC1传输数据(即图中的实线路径), 而路 径 HLR—STP— MSC2、 HLR—STP— MSC3、 HLR—STP—MSC4作为备用路 径(即图中的虚线路径)。 当在 MSC1正常工作的时候,上述备用路径不启用。 上述四个移动交换中心都与数据备份单元 54连接, 以便能够通过预定的通信 协议从数据备份单元中读取用户的位置区信息, 并且也能够实时地将各移动 交换中心中的用户位置信息备份到数据备份单元 54中。
所述数据备份单元 54, 与移动交换中心 53相连, 用于存储多个移动交换 中心的用户数据。 在本发明的实施例中, 数据备份单元 54可以由拜访位置寄 存器 VLR ( visitor location register )实现, 所述拜访位置寄存器是连接到一个 或多个移动交换中心的数据库, 它保存了在这些移动交换中心所覆盖的各小 区中所有移动用户在归属位置寄存器中的信息备份, 动态地存储了位于其管 辖区内的来访用户信息, 例如位置区信息。数据备份单元 54是一个存储在相 关 MSC区域内漫游的用户位置和管理信息的数据库,并且数据备份单元与网 内多个移动交换中心 MSC建立通信连接。 所述数据备份单元也可以是 VLR数据备份单元, 对于 VLR数据备份单 元, 可以是以下多种形式: 独立的物理实体、 分布在 MSC 中的实体、 MSC 内 VLR兼任的逻辑实体。 即 VLR数据备份单元可以是在网络中独立存在的 寄存器单元, 例如是网络中单独的数据库服务器。 也可以是位于单个或多个 MSC中的寄存器单元,或者是在 MSC中的 VLR, 例如将 VLR中的一部分资 源作为数据备份单元。 信形式, 例如: 七号信令, IP通信等等。 而且, VLR数据备份单元备份对象 包括: 网内单个 MSC或多个 MSC中的用户数据。
还请一并参阅图 6a和图 6b, 所述图 6a为本发明实施例中用户数据备份 的流程图, 图 6b为本发明实施例中获取用户数据的流程图。 在本实施例中, 利用 VLR数据备份单元, 保存池内所有 MSC中的用户数据。 其中, 所述用 户数据包括: 用户标识、 位置信息、 用户状态等等。 但并不限于上述信息, 用户数据可以包括与被叫用户相关的各种信息。
如果在网络中没有类似的数据备份单元,则 MSC为了获取用户信息必须 采用全网寻呼的方式获取用户数据, 其寻呼范围可能是整个城市获更大的范 围,这会给网络增加了很大的负荷。但如果在网络中具有 VLR数据备份单元, 移动交换中心 MSC就可以从 VLR数据备份单元获取用户的位置区信息, 可 以在一个指定的区域中寻呼被叫用户以获得用户数据更新, 从而避免了对被 叫用户进行全网范围的寻呼。
在网络运行过程中,各移动交换中心 MSC获得的数据可以实时地备份到 VLR数据备份单元。 可替换地, 移动交换中心获得的数据也可以按预定时间 间隔 (例如 5分钟 )备份到 VLR数据备份单元。
如图 6a所示,首先,移动交换中心 MSC向 VLR数据备份单元发出备份 用户数据请求, 可选择地, VLR数据备份单元在收到备份用户数据请求后, 向 MSC发出备份用户数据请求响应消息 , 在 MSC收到所述用户数据请求响 应消息后, 通过 MSC和 VLR数据备份单元之间的预定通信方式, 例如七号 信令, MSC将其中的用户数据备份到 VLR数据备份单元内。 对用户数据的 备份可以采用实时备份或以预定间隔进行备份,所述实时备份是对在 MSC中 的用户数据进行备份存储, 如杲出于减轻系统负荷的考虑, 还可以按照一定 的时间间隔进行备份, 具体时间间隔可以才艮据网络系统状况进行选择,
当移动交换中心 MSC需要获取 VLR数据备份单元中的用户数据时, 则 系统启动用户数据获取流程。 如图 6b所示, 首先, MSC向 VLR数据备份单 元发出用户位置信息请求, VLR数据备份单元收到所述用户位置信息请求后, 向 MSC发回用户位置信息响应。 在 MSC收到所述用户位置信息响应后, 通 过 MSC和 VLR数据备份单元之间的预定通信方式, 例如七号信令, MSC读 取 VLR数据备份单元内存储的用户数据。
再请参阅图 7,为本发明另一个实施例的在网络故障时的呼叫系统的结构 图。 在通常情况下, MSC和拜访位置寄存器(VLR ) —般都是设置在一个设 备中, 一个 MSC对应一个 VLR, MSC和 VLR之间通过内部接口通信。 而 在本实施例中, 将资源池内的 VLR集中设置, 多个 MSC共享 VLR, 同时 VLR进行用户数据备份。 当一个 MSC 出现故障时, 如果故障 MSC的用户被 叫, VLR可以选择一个正常的 MSC分配漫游号码, 从而完成被叫业务。 其 组网如图 7所示。
在本实施例的呼叫系统中, 包括: 归属位置寄存器 HLR71、转接单元 72、 第一拜访位置寄存器 73、 移动交换中心 74, 还包括第二拜访位置寄存器 75。
转接单元 72, 用于配置到多个移动交换中心之间的路径, 并且将提供漫 游号码请求消息发送到第一拜访位置寄存器。 所述转接单元本实施例以信令 转接点 STP来实现, 可选择地, 也可以通过相应的软件模块或硬件控制逻辑 实现。 所述 STP具有信令转接功能, 它可以将信令消息从一个信令点转发到 另一个信令点。
如图 7所示, 转接单元 72 (以信令转接点 STP为例)接收来自归属位置 寄存器 HLR71的信令, 例如, 提供漫游号码请求消息。 每个移动用户都必须 在其所归属的位置寄存器 HLR上注册登记。提供漫游号码请求消息是在主叫 用户向被叫用户发出呼叫时产生的, 该消息由主叫用户向归属位置寄存器 HLR发送, 则 HLR需要将该请求消息发送到拜访位置寄存器 VLR, 通过拜 访位置寄存器 VLR选择一个 MSC (比如图中 MSC2 ), 从而能够完成后续呼 叫。 STP用于对消息的转发。 其中, STP已经设置了到多个 MSC的路径。 第一拜访位置寄存器 73 , 与转接单元 72 (以信令交换点为例)相连, 用 于选择正常的移动交换中心, 并为所述正常移动交换中心分配漫游号码。 所 述第一拜访位置寄存器通过将资源池内的 VLR集中设置来实现的。 通常, VLR与各个 MSC对应设置, 各个 VLR备份相应 MSC中的用户数据, 而在 本实施例中, 集中设置的 VLR可以将资源池内的所有 MSC中的用户数据记 录下来, 以便完成寻呼。
在本实施例中, 还包括了第二拜访位置寄存器 75。 所述第二拜访位置寄 存器 75是作为第一拜访位置寄存器的备用设备而设置的, 当第一拜访位置寄 存器(即主用 VLR )故障时, 第二拜访位置寄存器(即备用 VLR )接替第一 拜访位置寄存器工作, 其连接关系与第一拜访位置寄存器相同, 在此不再赘 述。
移动交换中心 74, 分别与信令交换点 72和第一拜访位置寄存器 73和第 二拜访位置寄存器 75相连, 用于通过与数据备份单元进行通信获取被叫用户 的位置区信息, 以及在用户位置区中进行寻呼以获取用户的位置信息。 在本 实施例中, 具有四个移动交换中心 MSC1、 MSC2、 MSC3、 MSC4。 所述四个 移动交换中心与信令转接点 STP、 第一拜访位置寄存器、 第二拜访位置寄存 器之间都建立了路径。
还请参阅图 8, 为本发明实施例在网络故障时的呼叫方法的流程图。所述 方法包括:
步骤 801 : 配置到多个移动交换中心之间的路径, 其中, 所述路径包括到 被叫移动交换中心的主路径和到其它移动交换中心的备用路径;
步 802: 当被叫移动交换中心故障后,通过所述备用路径将提供漫游号 码请求消息发送到第一拜访位置寄存器;
步骤 803: 所述拜访位置寄存选择正常的移动交换中心, 并为所述正常移 动交换中心分配漫游号码;
步骤 804: 通过与正常移动交换中心之间的路径返回漫游号码, 完成后续 呼叫。
对该方法的具体实现过程详见图 9, 其具体的实现过程为: 在本实施例中, 如图所示, 在步骤 901 , 由于有主叫用户向网内用户发起 呼叫, HLR向 VLR发送漫游号码请求消息。 VLR需要获知被叫移动交换中 心是否故障, 因此在步骤 902, 判断被叫 MSC的可用状态, 即通过主动检测 和获取相关信息来判断 MSC是否故障。
其中, VLR可以主动判断 MSC故障是否可用, 例如, 通过握手机制来 判断 MSC的状态:在 VLR与 MSC之间建立握手机制, 当握手操作失败时得 知 MSC故障。 另外, 可以通过对链路状态进行判断 MSC的故障状况, 例如, 当其间的链路状态信息为 MSC信令点不可达时, VLR获知该 MSC发生了故 障。
VLR还可以通过一些途径获取 MSC是否故障, 例如: 由网管系统通知
VLR某个 MSC故障 (可以是网管系统自动通知或人工通知); 或者通过其它 网元(如资源池内其它的正常 MSC )通知 VLR某个 MSC故障。
在 VLR获知 MSC1故障后, 如果故障 MSC1的用户被叫, HLR向 VLR 发送漫游号码请求消息, 在步驟 904, VLR向其它正常的 MSC (例如 MSC2 ) 分配漫游号码, 然后在步骤 905, VLR把具有 MSC2标识信息的漫游号码返 回给 HLR, HLR向网关移动交换中心( GMSC )返回路由请求消息。从而 GMSC 能够与 MSC2之间建立后续的接续流程, 从而完成用户的被叫过程。 该后续 呼叫的过程是现有的 WCDMA、 CDMA, TD- CDMA、 GSM等通信系统的标 准寻呼流程, 具体流程为本领域技术人员所熟知, 因此这里不作进一步的描 述。
根据上述流程, HLR向 VLR发送漫游号码请求消息后,在步骤 903 , VLR 需要从所有正常 MSC中选择一个 MSC, 以便进行漫游号码分配以及呼叫用 户等操作。 VLR从资源池中选择一个正常 MSC的方法可以是各种适合的算 法, 例如: 在资源池内所有正常 MSC中随机选择一个 MSC, 或者采用轮选 的方式从中选择一个 MSC。以轮选方式为例 ,如果在上一次故障时是由 MSC2 作为备用移动交换中心工作, 当经过一段时间后, 网络中的某个 MSC再次出 现故障时, 按照序号排列, 则应该选取 MSC3作为备用移动交换中心, 此时 如果 MSC3可以正常工作, 则启用 MSC3工作, 如果 MSC3为发生故障的移 动交换中心, 则继续轮选 MSC4作为备用移动交换中心。 VLR选择正常 MSC的方法还包括: 根据 MSC的负荷情况, 选择负荷最 小的 MSC。 选择负荷最小的 MSC更有利于负荷分担, 使各 MSC之间的负荷 均衡。
VLR还可以通过静态配置的方法选择正常 MSC, 静态配置是指对某些 MSC的替代工作关系进行固定配置, 即当某个指定 MSC故障时, VLR选择 预定的 MSC代替其工作。 例如, 配置 MSC3作为 MSC1的备用移动交换中 心, 当检测到 MSC1出现故障后, 启用 MSC3对 MSC1中的用户进行呼叫。
由上述公开的技术方案可知, 在网络发生故障后, 故障 MSC所对应用户 的被叫业务被转换到正常的 MSC执行, 因此不受故障 MSC的影响 , 解决了 原来 MSC故障后, 用户可能最长需要几个小时才能重新恢复被叫的问题。 而 且, 由于在本发明实施例的呼叫恢复系统中采用了数据备份单元, 从而避免 了通过全网寻呼查找用户信息, 提高了网絡运行效率。
以上所述的本发明实施方式, 并不构成对本发明保护范围的限定。 任何 在本发明的精神和原则之内所作的任何修改、 等同替换和改进等, 均应包括 在本发明的权利要求保护范围之内。
4-

Claims

权 利 要 求
1、 一种在网络故障时的呼叫恢复方法, 其特征在于, 包括:
当被叫移动交换中心故障后, 通过备用路径将提供漫游号码请求消息发 送到正常的移动交换中心;
所述正常移动交换中心莰取被叫用户的位置区信息;
根据所述被叫用户的位置信息进行预寻呼;
在收到该用户反馈的预寻呼响应后更新用户数据;
通过与正常移动交换中心之间的路径返回漫游号码, 完成后续呼叫。
2、 根据权利要求 1所述在网络故障时的呼叫恢复方法, 其特征在于, 在 配置到被叫移动交换中心的主路径时配置到其它多个移动交换中心之间的备 用路径。
3、 根据权利要求 2所述在网络故障时的呼叫恢复方法, 其特征在于, 所 述正常移动交换中心通过数据备份单元获取被叫用户的位置区信息。
4、 根据权利要求 3所述的呼叫恢复方法, 其特征在于, 所述数据备份单 元用于定期、 实时或二者交替存储多个移动交换中心中的用户位置区信息。
5、根据权利要求 1或 3所述在网络故障时的呼叫恢复方法,其特征在于, 所述获取被叫用户的位置区信息的过程为: 正常的移动交换中心向数据备份 单元查询用户的位置区信息。
6、根据权利要求 1或 3所述在网络故障时的呼叫恢复方法,其特征在于, 所述获取被叫用户的位置区信息的过程为: 数据备份单元向正常移动交换中 心按预定时间间隔发送用户的位置区信息。
7、 根据权利要求 1所述在网络故障时的呼叫恢复方法, 其特征在于, 所 述用户数据包括: 用户标识、 位置区信息和用户状态。
8、 一种在网络故障时的呼叫恢复系统, 其特征在于, 包括: 转接单元和 移动交换中心, 其中,
所述转接单元, 用于通过备用路径将提供漫游号码请求消息发送到正常 的移动交换中心;
所述移动交换中心, 与转接单元相连, 用于根据所述提供漫游号码请求 消息获取被叫用户的位置区信息, 在用户位置区中进行预寻呼, 并收到预寻 呼响应后更新用户数据, 以及通过该备用路径返回漫游号码, 完成后续呼叫。
9、 根据权利要求 8所述在网络故障时的呼叫恢复系统, 其特征在于, 所 述系统还包括: 数据备份单元, 用于存储至少一个移动交换中心所对应的用 户位置区信息。
10、 根据权利要求 9所述在网络故障时的呼叫恢复系统, 其特征在于, 所述数据备份单元位于一个或多个移动交换中心内部。
11、 根据权利要求 9或 10所述在网络故障时的呼叫恢复系统, 其特征在 于, 所述数据备份单元为数据库服务器或拜访位置寄存器。
12、 根据权利要求 8所述在网络故障时的呼叫恢复系统, 其特征在于, 所述转接单元为信令转接点。
13、 一种在网络故障时的呼叫恢复方法, 其特征在于, 包括:
当被叫移动交换中心故障后 , 通过备用路径将提供漫游号码请求消息发 送到第一拜访位置寄存器;
所述拜访位置寄存选择正常的移动交换中心, 并为所述正常移动交换中 心分配漫游号码;
通过与正常移动交换中心之间的路径返回漫游号码, 完成后续呼叫。
14、 根据权利要求 13所述在网络故障时的呼叫恢复方法, 其特征在于, 所述备用路径为在配置到被叫移动交换中心的主路径时, 预先配置到其它多 个移动交换中心之间的备用路径。
15、 根据权利要求 14所述在网络故障时的呼叫恢复方法, 其特征在于, 所述选择正常的移动交换中心的方式下述任意一种:
轮流选择所有正常的移动交换中心;
选择指定的移动交换中心;
根据各移动交换中心的负荷状况, 选择负荷最小的移动交换中心。
16、 根据权利要求 13所述在网络故障时的呼叫恢复方法, 其特征在于, 当被叫移动交换中心和第一拜访位置寄存器故障后, 将提供漫游号码请求消 息发送到第二拜访位置寄存器。
17、 一种在网络故障时的呼叫恢复系统, 其特征在于, 包括: 转接单元、 第一拜访位置寄存器和移动交换中心, 其中, 所述转接单元, 用于通过备用路径将提供漫游号码请求消息发送到第一 拜访位置寄存器;
所述第一拜访位置寄存器, 与转接单元相连, 用于根据接收到提供漫游 号码请求消息选择正常的移动交换中心, 并为所述移动交换中心分配漫游号 码;
所述移动交换中心, 与第一拜访位置寄存器相连, 用于根据接收到的漫 游号码完成被叫用户的后续呼叫。
18、 根据权利要求 17所述在网络故障时的呼叫恢复系统, 其特征在于, 所述系统还包括: 笫二拜访位置寄存器, 与转接单元与移动交换中心分别相 连, 用于当第一拜访位置寄存器故障时代替第一拜访位置寄存器工作。
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CN100563392C (zh) 2009-11-25
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EP2003913A9 (en) 2009-04-15
EP2003913A4 (en) 2009-11-25
CN101047959A (zh) 2007-10-03

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