WO2008003221A1 - Procédé et dispositif de récupération de séquence de temps de signalisation de réseau global - Google Patents

Procédé et dispositif de récupération de séquence de temps de signalisation de réseau global Download PDF

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Publication number
WO2008003221A1
WO2008003221A1 PCT/CN2007/001836 CN2007001836W WO2008003221A1 WO 2008003221 A1 WO2008003221 A1 WO 2008003221A1 CN 2007001836 W CN2007001836 W CN 2007001836W WO 2008003221 A1 WO2008003221 A1 WO 2008003221A1
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WO
WIPO (PCT)
Prior art keywords
signaling
signaling message
reported
softswitch
network element
Prior art date
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PCT/CN2007/001836
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English (en)
Chinese (zh)
Inventor
Wei Xie
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.
Publication of WO2008003221A1 publication Critical patent/WO2008003221A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0025—Provisions for signalling

Definitions

  • the present invention relates to a timing reduction method, and in particular, to a method and apparatus for restoring a whole network signaling timing. Background technique
  • NGN Next Generation Network
  • NGN Next Generation Network
  • the first is the Decentralized GPS (Global Positioning System).
  • GPS Global Positioning System
  • the time server provides the reference time, which is obtained from the GPS device, and the accuracy is about lms, which is the reference time of the local network.
  • the device in the network obtains the reference time from the server through the time-based protocol.
  • the common time-based protocols include NTP (Network Time Protocol) and SNTP (Simple Network Time Protocol). This reference timestamp is then applied to the signaling of each device. In this way, when the timing of the signaling of each device is restored, the time stamp can be sorted according to the time stamp.
  • the GPS system is controlled by the US military, and its P code is only open to the US military and authorized users. Civil use The time synchronization accuracy of the C/A code is two orders of magnitude lower than the P code, and its security is not guaranteed;
  • the GPS signal is transmitted wirelessly and is susceptible to external interference
  • the GPS receiver's time signal is output through a standard interface (such as the RS-232 interface). Many online devices (such as switches) do not have such a dedicated interface.
  • the second is SDH (Synchronous Digital Hierarchy) network time synchronization technology.
  • the solution is to set a clock server in the network, and then transfer the time of the clock server to each device, and each device puts this reference time stamp in the signaling, as long as the stability of the clock signal in the transmission process is ensured. Reproducibility ensures that the time of each device is synchronized.
  • the advantages of transmitting time-frequency information with SDH's STM-N signal is that it has strong filtering ability for jitter and is not affected by the adjustment of the branch pointer. Therefore, transparent transmission of time information can be realized between STM-N ports.
  • the methods of transmitting standard time using the SDH network include a one-way method, a two-way method, and a common view method.
  • Figure 1 is a schematic diagram of the common view method. The common view method compares the clocks of the nodes with the standard clock at the same time, and the instantaneous value error between the node clocks is compared and corrected by the subsequent data exchange.
  • the two signaling timing restoration schemes of the prior art have an impact on the existing networking mode, and the device needs to be modified on the hardware.
  • An embodiment of the present invention provides an all-network signaling timing reduction method that does not affect the existing networking mode and does not need to be modified on the hardware.
  • Another aspect of the embodiments of the present invention provides a network-wide signaling timing restoration apparatus.
  • a method for restoring a whole network signaling timing includes the following steps:
  • the signaling cancellation uses the clock correction to determine the insertion position of the signaling message in the signaling message reported by the network element that cannot be matched with the signaling message reported by the softswitch in the whole network signaling sequence, and inserts the full In the network signaling timing, the original network-wide signaling timing is restored.
  • a network-wide signaling timing recovery device includes:
  • the entire network signaling timing generating unit is configured to traverse the signaling message reported by the softswitch to generate a network-wide signaling timing
  • the comparing unit is configured to traverse the message reported by the network element, compare the signaling message reported by the softswitch with the signaling message reported by the network element, and find that the signaling message reported by the network element and the signaling message reported by the softswitch cannot be Matched signaling message;
  • a clock correction unit configured to use a clock correction to determine an insertion position of a signaling message that cannot be matched with a signaling message reported by the softswitch in the signaling message of the network element in the signaling timing of the network, and insert In the whole network signaling timing, the original network-wide signaling timing is restored.
  • the embodiment of the present invention implements the time series restoration of the entire network signaling by using simple message comparison and clock correction, which does not affect the existing networking mode, and the device does not need to be modified in hardware, so the device is implemented. Low cost, low complexity, suitable for large-scale commercial use.
  • Figure 1 is a schematic diagram of a prior art common mode method for transmitting standard time using an SDH network.
  • FIG. 2 is a schematic diagram of a network-wide signaling message collection system according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a network-wide signaling tracking device according to an embodiment of the present invention.
  • FIG. 4 is a flow chart of a method for restoring a whole network signaling timing according to an embodiment of the present invention.
  • FIG. 5 is a signaling flowchart of a message obtained by comparing a message in a network-wide signaling timing restoration method according to an embodiment of the present invention.
  • FIG. 6 is a clock corrected and restored method in a network-wide signaling timing reduction method according to an embodiment of the present invention.
  • the resulting original signaling flow chart is a clock corrected and restored method in a network-wide signaling timing reduction method according to an embodiment of the present invention.
  • FIG. ⁇ is a schematic structural diagram of a network-wide signaling timing restoration apparatus according to an embodiment of the present invention.
  • the network-wide signaling message collection system of the embodiment of the present invention includes a network-wide signaling tracking device, a softswitch and a network element involved in the call.
  • the entire network signaling tracking device It is responsible for initiating the whole network signaling tracking task before the call dialing test, collecting the softswitch and the signaling messages of all network elements involved in the call in the whole network, and realizing the collection and analysis of the whole network signaling messages. Comparison. As a FTP server, the entire network signaling tracking device sends the task ID, the IP address of the FTP server, the FTP directory, the user name and password, and the collection period to the softswitch when the signaling tracking task is created, and scans the FTP directory in real time. The softswitch and the signaling message files uploaded by the network element are collected, and all signaling tracking data are uniformly analyzed and compared, and the tracking result is displayed.
  • Softswitch Accepts the signaling tracking task command of the entire network signaling tracking device, determines the gateway where it is located according to the tracking number, and sends a startup signaling tracking command to the gateway. If it cannot be determined immediately, the call is determined when the call is generated. The gateway and the network element control the network element to initiate a signaling tracking task by extending the control protocol.
  • the softswitch is used as the FTP client.
  • the signaling tracking task command message sent includes the task ID, the IP address of the FTP server, the FTP directory, the username and password, and the collection period.
  • the signaling tracking result is recorded at the same time, and periodically The tracking result is uploaded to the FTP directory of the FTP server as an FTP file.
  • the NE As the FTP client, the NE starts the trace task under the control of the softswitch, records the signaling trace result, and periodically uploads the trace result to the FTP directory of the FTP server.
  • the network-wide signaling tracking device of the embodiment of the present invention includes a task management module, a data collection module, an FTP server, a data management module, a protocol parsing module, a timing analysis module, and a result display module.
  • the function description of each module is as follows:
  • the task management module is responsible for creating and stopping the tracking task, and managing the currently running tracking task.
  • the data collection module monitoring the data received by the FTP server, and collecting the softswitch and the signaling tracking data reported by the network element through the FTP directory;
  • FTP server Receives tracking data of softswitch and NE upload
  • Protocol parsing module responsible for parsing signaling tracking data of different protocols
  • Timing analysis module Compare and analyze all signaling data collected in the tracking task
  • Result Display Module Graphically displays the results of the signaling timing analysis in the tracking task.
  • the task management module accepts user commands, creates tracking tasks, controls softswitches to start tracking tasks, and manages currently running tasks.
  • the FTP server responsible for receiving data exchanged by the softswitch and the network element;
  • the data collection module monitors the FTP server and collects the received data;
  • the data collection module hands over the collected data to the data management module for unified maintenance; then the data management module passes the tracking task data through the protocol.
  • Real-time analytical analysis of the parsing module and the timing analysis module, and finally the result display module graphically displays the analysis results in real time.
  • the network-wide signaling tracking device collects the softswitch and the signaling messages of the network elements: the real-time uplink mode can be adopted, that is, the softswitch and the network elements in the signaling tracking process, through the Socket interface, real-time The signaling message is reported to the entire network signaling tracking device.
  • the FTP file reporting method can also be adopted. In this way, the entire network signaling tracking device is used.
  • the FTP server, the softswitch, and the network elements are used as FTP clients.
  • the softswitch and the network element upload the signaling message to the entire network signaling tracking device in a periodical manner through the FTP file.
  • the whole network signaling message collection system of the embodiment of the present invention relates to the restoration of the entire network signaling timing.
  • the method for restoring the entire network signaling timing according to the embodiment of the present invention includes: a message necessarily has a transmitting end and a receiving end, and both ends will The signaling message is sent to the entire network signaling tracking device, and the signaling messages at both ends are completely identical.
  • the softswitch and the gateway send messages to each other: The softswitch sends the REQ, the gateway responds to an RSP, and the network-wide signaling tracking device has REQ (softswitch transmission), REQ (gateway reception), and RSP (gateway transmission).
  • RSP softswitch reception
  • REQ softswitch transmission
  • RSP softswitch reception
  • RSP gateway transmission
  • a key part of this solution is to find out the timeline of a benchmark, that is, based on the time of which device, the time of other devices can be mapped to the device on the network-wide signaling message collection system. Prepare it. Since the softswitch acts as the core device in the NGN network, it can receive the signaling from all other network elements, so the time of the softswitch should be selected as the reference timeline.
  • the method for restoring the entire network signaling timing includes the following steps:
  • the clock correction is used to determine the insertion position of the signaling message that is not matched by the signaling message reported by the network element in the signaling message reported by the network element in the signaling timing of the entire network, and is inserted into the full network In the timing, the original network-wide signaling timing is restored.
  • Each reported signaling message contains at least the following five pieces of information: TraceRefld (Track ID), SessionID (Session ID), Source Device ID, Destination Device ID, and Send/Receive ID.
  • TraceRefld is used to distinguish messages between tracking tasks.
  • Sessionld is used to distinguish between messages that are tracked between different calls of a task
  • the source device identifier is used to identify which device the signaling is sent by
  • the destination device identifier is used to identify which device the signaling is received by
  • the send/receive flag is used to identify whether the signaling is sent by the device or received.
  • the signaling flow chart can be drawn as long as the softswitch message is traversed; but in case of abnormal conditions, such as the network element sends a message, the softswitch confiscates To this, this message also needs to be inserted into the signaling process. Therefore, it is also necessary to traverse the message of the network element, find out a message in which the message cannot be matched with the softswitch, and insert it into the signaling flow chart.
  • the embodiment of the present invention uses the call as the minimum unit. That is, the message is divided into units of devices, TraceRefld, and Sessionld.
  • the message of each unit reported by the softswitch is traversed one by one. Each time a message is traversed, a drawing unit is generated.
  • the drawing element list obtained after the traversal indicates the signaling flow of the call. According to the drawing meta-list, a flow chart of the entire call can be drawn.
  • the source device identifier, the destination device identifier, and the send/receive identifier are extracted from the signaling message reported by the softswitch.
  • the destination device signaling message is searched for its reception.
  • the version, for the signaling message received by the softswitch, searches for the sending version in the source device signaling message.
  • the search mode is to compare the signaling messages reported by each softswitch with the signaling messages reported by the network element in a bitwise manner to find out the signaling that cannot be matched between the signaling messages reported by the network element and the signaling messages reported by the softswitch. Message.
  • the signaling message reported by a softswitch is compared with the signaling message in a period reported by the network element, if it is found in the signaling message in a period reported by the network element, If the signaling message of the exchanged report is compared with the network element signaling message with the same result, the network element signaling message is identified as being compared, and then the signaling message reported by the next softswitch and a period reported by the network element are reported. The subsequent signaling messages are compared by bit. For the network element signaling message that is completely consistent with the result of the comparison with the signaling message reported by the softswitch, the searched network element has no compared identifier. The message is considered to be a signaling message that is not matched by the signaling message reported by the softswitch in the signaling message reported by the network element.
  • the softswitch reports two messages a and b, and gateway A reports c, a, and two messages. After comparison, a and a are the same. If b and c are different, then a is identified as Compare, c is considered a lost message. The missing message is also inserted into the drawing meta-list.
  • the signaling message reported by a softswitch and the signaling message in a period reported by the network element are compared by bit, if the signaling message in one cycle reported by the network element is not found in the message If the signaling message reported by the softswitch compares the network element signaling message with the same result, the signaling message reported by the subsequent softswitch is compared with the signaling message reported by the network element in one cycle, if it is in the network.
  • the signaling message in one cycle of the meta-report can be searched for the NE signaling message that is completely consistent with the comparison result of the signaling message reported by the subsequent softswitch, and the previous softswitch signaling message is considered to be lost;
  • the one of the signaling messages reported by the network element is not searched for and reported by the softswitch.
  • the signaling message related to the network element is compared with the network element signaling message with the same result. Then, the signaling message related to the network element on the softswitch continues to be followed by the next periodic report reported by the network element. Let the messages be compared.
  • the softswitch reports two messages a and b, and gateway A reports a message c, a and c are different. If b and c are the same, then a is considered to be lost; if b and c are different , then the softswitch a, b and gateway A's c continue to go to the next cycle to continue to participate in the comparison.
  • Gateway 1 a (issued, time 09:58:00) (not shown), b (issued, Time 09:58:01), c (received, time 09:58:03)
  • Gateway 2 ( ] ⁇ 02 ) : 11 (received, time 10:00:04), i (issued, time 10:00:06) (not shown), j (issued, time 10:00:07)
  • the clock correction is used to determine the insertion position of the signaling message that is not matched by the signaling message reported by the network element in the signaling message reported by the network element in the signaling timing of the entire network, and is inserted into the full network In the timing, the original network-wide signaling timing is restored.
  • Clock Correction Because the clocks between devices are not synchronized, they cannot be sorted based on the clock of each device. You must first perform clock correction. The clock correction is based on the softswitch clock. As long as a signaling message matching the softswitch signaling message can be searched in the network element signaling message, clock correction can be performed. It is assumed that the time of the signaling message reported by the network element is the network element time t(J), and the time corresponding to the softswitch is the softswitch time t(SX), and the time difference between the softswitch and the network element is the first time difference At, The transmission delay between the softswitch and the network element is the first transmission delay t(C), then
  • the softswitch time t(SX) is equal to the network element time t(NU) minus, the first time difference At and the first transmission delay t(C) ground sum, ie
  • the At + t(C) is a signaling message reported by the softswitch in the signaling message reported by the multiple network elements.
  • the corresponding correspondence between the signaling message in the signaling message of the network element and the signaling message reported by the softswitch cannot be matched on the softswitch.
  • the signalling sequence after the restoration is a, b(d), e(h), f(c), i, j(g), as shown in FIG.
  • a and SX sent by MG1 are not received, so MG1 retransmits b; i and SX sent by MG2 are not received, so MG2 resends j.
  • the embodiment of the present invention further discloses a network-wide signaling timing recovery device.
  • the method includes: a network-wide signaling timing generating unit, configured to traverse a signaling message reported by a softswitch, and generate a network-wide signaling sequence;
  • the comparing unit is configured to traverse the message reported by the network element, compare the signaling message reported by the softswitch with the signaling message reported by the network element, and find that the signaling message reported by the network element and the signaling message reported by the softswitch cannot be Matched signaling message;
  • a clock correcting unit configured to use a clock correction to determine an insertion position of a signaling message that is not matched by a signaling message reported by the softswitch in the signaling message reported by the network element in the signaling timing of the entire network, and insert the location into the In the whole network signaling timing, the original network-wide signaling timing is restored.
  • the signaling message reported above includes at least the following five pieces of information: a tracking ID, a session ID, a source device identifier, a destination device identifier, and an outgoing/receiving identifier.
  • the above unit is a unit that divides signaling messages reported by the softswitch in units of devices, tracking IDs, and session IDs.
  • the above device is located in the entire network signaling tracking device.
  • the specific comparison method and clock correction method are the same as the foregoing process, and are not mentioned.
  • the embodiment of the present invention can implement the timing restoration of the entire network signaling by using simple signaling message comparison and clock correction, and has no impact on the existing networking mode, and the device does not need hardware. Make changes.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included. It is within the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé et un dispositif de récupération de séquence de temps de signalisation de réseau global. Le procédé selon l'invention comporte les étapes suivantes: (A) les messages de signalisation rapportés par le commutateur logiciel sont parcourus pour produire la séquence de temps de signalisation de réseau (1); (B) les messages de signalisation rapportés par le commutateur logiciel sont comparés aux messages de signalisation rapportés par l'élément réseau afin d'identifier le message de signalisation ne correspondant pas au message de signalisation rapporté par le commutateur logiciel, dans les messages de signalisation rapportés par l'élément réseau (2); (C) la position d'insertion dans la séquence de temps de signalisation de réseau global, du message de signalisation ne correspondant pas au message de signalisation rapporté par le commutateur logiciel, dans les messages de signalisation rapportés par l'élément réseau, est déterminée au moyen de la correction d'horloge, et ledit message est inséré dans la séquence de temps de signalisation de réseau global (3) afin de récupérer la séquence de temps de signalisation de réseau global d'origine.
PCT/CN2007/001836 2006-06-29 2007-06-11 Procédé et dispositif de récupération de séquence de temps de signalisation de réseau global WO2008003221A1 (fr)

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CN200610061481.2 2006-06-29
CN2006100614812A CN101098204B (zh) 2006-06-29 2006-06-29 全网信令时序还原方法

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CN103346855B (zh) * 2013-05-31 2016-09-07 华为技术有限公司 一种信令时序还原方法及装置
CN117768336A (zh) * 2022-09-16 2024-03-26 中兴通讯股份有限公司 时序信令生成方法、系统、电子设备及存储介质

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