WO2007045153A1 - Procede, dispositif et systeme de mise en oeuvre de commande de passerelle multimedia dans le reseau tdm - Google Patents

Procede, dispositif et systeme de mise en oeuvre de commande de passerelle multimedia dans le reseau tdm Download PDF

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Publication number
WO2007045153A1
WO2007045153A1 PCT/CN2006/002687 CN2006002687W WO2007045153A1 WO 2007045153 A1 WO2007045153 A1 WO 2007045153A1 CN 2006002687 W CN2006002687 W CN 2006002687W WO 2007045153 A1 WO2007045153 A1 WO 2007045153A1
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WIPO (PCT)
Prior art keywords
media gateway
gateway control
layer
control protocol
message
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PCT/CN2006/002687
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English (en)
Chinese (zh)
Inventor
Tianzhen Huang
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Huawei Technologies Co., Ltd.
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Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007045153A1 publication Critical patent/WO2007045153A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment

Definitions

  • the present invention relates to a bearer technology for communication data, and more particularly to implementing media gateway control in a time division multiplexed network between a softswitch and a media gateway.
  • Method and equipment, system
  • NTN Next Generation Network
  • MGW media gateway
  • Softswitches and media gateways can be placed in separate locations as separate entities, facilitating maintenance, and most of the data can be exchanged nearby, saving transmission resources.
  • mobile communication networks including Wideband Code Division Multiple Access (WCDMA) and Code Division Multiple Access 2000 (CDMA2000) networks
  • WCDMA Wideband Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000
  • the softswitches of the fixed network and the mobile softswitch devices in the mobile communication core network can be collectively referred to as softswitches.
  • the MEGACO protocol or international telecommunications defined by the Internet Engineering Task Force (IETF) is used between the softswitch and the MGW.
  • Alliance-telecommunications standard The H.248 protocol defined by the International Telecommunication Union Telecommunication Standardization Sector ("ITU-T") is used as the Media Gateway Control (MGC) protocol.
  • the MEGACO protocol is basically the same as the H.248 protocol. It is used for communication between softswitch and MGW. It provides control media establishment, modification and release mechanisms. It can also carry some associated call signaling and support traditional network terminal calls. . . This article uses the H.248 protocol as an example.
  • the H.248 protocol needs to use the underlying bearer protocol.
  • the lower layer of the typical H.248 protocol carries the Transmission Control Protocol ("TCP") and the Stream Control Transmission Protocol (Internet Protocol, "IP”). , referred to as “SCTP” or User Datagram Protocol (“UDP”) protocol, or Asynchronous Transfer Mode (ATM) network messaging layer 3 broadband (Message Transfer Part Level 3 Broadband, referred to as "MTP3B").
  • TCP Transmission Control Protocol
  • IP Internet Protocol
  • ATM User Datagram Protocol
  • MTP3B Asynchronous Transfer Mode
  • FIG. 1 A schematic diagram of the physical connection of the existing typical service control and the network separating the bearer media is shown in FIG. 1 .
  • the network entities such as the softswitch 110 and the MGW 120 are connected through an IP bearer network or an ATM bearer network 130.
  • the protocol layers of the IP bearer network and the ATM bearer network between the softswitch and the MGW are shown in Figure 2 and Figure 3, respectively.
  • the IP bearer network When the IP bearer network is used, the physical layer 210, the link layer 220, the IP layer 230, the SCTP/TCP UDP layer 240, the H.248 processing layer 250, and the application layer 260 are included.
  • the ATM bearer network the physical layer 310, the link layer 320, the MTP3B layer 330, the H.248 processing layer 340, and the application layer 350 are included.
  • the network coverage of the TDM bearer network used by the Public Switched Telephone Network (PSTN) is very high.
  • the network entity such as the switching and the MGW needs to connect through the TDM bearer network and carry the H.248 message on the SS7 signaling.
  • TDM Time Division Multiplexing
  • physical transmission uses E1 or fiber, etc., taking E1 as an example, an E1 is divided into 32. For each time slot, some time slots can be used for signaling.
  • the seventh signaling has been widely used, and the seventh signaling protocol is layered.
  • the seventh signaling protocol layer related to the present invention is shown in FIG.
  • the SS7 protocol layer related to the present invention is divided into a bottom layer: a physical layer 410, a message transfer part 2 ("MTP2") 420, and a message transfer part level 3 (Message Transfer Part Level 3, Referred to as " ⁇ 3") 430, a Signalling Connection Control Part (“SCCP”) layer 440, an SCCP application layer 450, and a service layer 460.
  • MTP2 message transfer part 2
  • SCCP Signalling Connection Control Part
  • Each signaling point has a peering layer 7 signaling protocol layer. As shown in FIG. 4, the signaling point 1 and the signaling point 2 respectively carry the peer 7 signaling protocol layer.
  • protocol layering is equivalent to that the message packet is hierarchical, and the peer-to-peer protocol layer performs corresponding processing on the message packet at the same level.
  • the SCCP layer at the transmitting end receives the data packet from the upper layer, that is, the SCCP application layer. And the segmentation operation is sent to the lower layer, and the SCCP layer at the receiving end reassembles the data packet received from the lower layer and submits it to the SCCP application layer.
  • the SCCP application layer 450 currently has a Base Station Sub-system Application Part (BSSAP), a Mobile Application Part (MAP) and an Intelligent Network Application Part. , the tube is called “INAP” and so on.
  • BSSAP Base Station Sub-system Application Part
  • MAP Mobile Application Part
  • INAP Intelligent Network Application Part
  • the tube is called "INAP" and so on.
  • BSSAP Base Station Sub-system Application Part
  • the signaling point 1 is the MSC
  • the signaling point 2 is the base station controller (Base Station Controller, referred to as "BSC").
  • BSC Base Station Controller
  • the BSSAP message is sent to the SCCP layer; then, the message is processed at the SCCP layer, plus signaling points and other signaling, and then SCCP message header is sent to the MTP3 layer for processing; Then, the message is processed at the MTP3 layer, the link is selected, and the related information is filled in the MTP layer and sent to the MTP2 for processing; the MTP2 layer sends the message to the BSC through the physical layer; at the receiving end, that is, the BSC, the SS7 protocol The layer unpacks the message packet from bottom to top, sends it from MTP2 to MTP3, and then sends it to the SCCP layer.
  • the SCCP layer sends it to the BSSAP layer according to the subsystem, and the BSSAP layer processes it and sends it to the service application layer.
  • the BSC send messages to the MSC, thus implementing message peer-to-peer interaction.
  • the softswitch 510 and the MGW 520 are implemented by using a TDM bearer network connection. Separation.
  • the Signaling Transfer Point (STP) 530 is used to forward the SS7 message used by the TDM bearer network.
  • STP Signaling Transfer Point
  • the prior art solution uses a router or other time slot crossover device to carry the IP data packet to the time slot of the TDM bearer network through rate adaptation, so as to implement the connection between the soft switch and the TDM bearer network between the MGW.
  • the router or the time slot interleaver can realize the insertion of the time slot data and complete the mapping of the IP data packet to the time slot of the TDM bearer network, but the IP switch is equivalent to the IP switch between the soft switch and the MGW.
  • the prior art scheme uses router 630 to carry IP data packets between softswitch 610 and MGW 620 into time slots of the TDM bearer network.
  • the above solution has the following problems:
  • the No.7 signaling of the TDM network is indirect to the bearer of the Media Gateway Control Protocol, which not only requires additional equipment, but also cannot utilize the existing signaling network in the TDM bearer network. It is also impossible to utilize the signaling transfer function of STP.
  • the present invention provides a method, apparatus, and system for implementing media gateway control in a time division multiplexed network, such that the media gateway control protocol can be directly carried using the No. 7 signaling of the existing TDM network.
  • a method for implementing media gateway control in a time division multiplexing network wherein a softswitch and a media gateway configure a protocol layer and a signaling point code of a SS7 protocol;
  • the signaling connection control part of the signaling protocol configures the media gateway control protocol processing layer and the subsystem number; the method includes: the media gateway control protocol processing layer and the signaling connection control layer interact, at least in part of the media Using the signaling point encoding and the routing process in the routing process of the gateway control protocol message
  • the subsystem number is used as a routing basis; the media gateway control protocol message is carried in the time division multiplexing network and transmitted according to the routing basis.
  • the media gateway control protocol message processed by the media gateway control protocol processing layer is a MEGACO/H.248 protocol message.
  • the media gateway control protocol processing layer and the signaling connection control layer perform interaction, including: at a sender, the signaling connection control layer receives a media gateway control protocol from the media gateway control protocol processing layer a message, and performing segmentation when the media gateway control protocol message length is greater than a predetermined length and transmitting to the lower layer using the enhanced unit data; and at the receiving side, the signaling connection control layer receives the enhanced unit data from the lower layer and performs Reorganizing, and transmitting the reassembled media gateway control protocol message to the media gateway control protocol processing layer according to the subsystem number.
  • the media gateway control protocol processing layer when the signaling connection control layer receives the media gateway control protocol message from the media gateway control protocol processing layer, the media gateway control protocol processing layer further indicates the subsystem number.
  • the UDT indication primitive is used when the reassembled media gateway control protocol message is sent to the media gateway control protocol processing layer.
  • the signaling point configured by the softswitch and the media gateway is encoded as a signaling point code of a domestic backup network.
  • the subsystem number is different from the subsystem number of the application layer of the other type of signaling connection control part.
  • the media gateway control protocol processing layer has a subsystem number of 88.
  • the softswitch and the media gateway further configure a global code
  • the method further includes: the media gateway control protocol processing layer optionally using the global code and the subsystem number in a partial message routing process As a basis for routing.
  • the media gateway control protocol message is carried in a time division multiplexing network.
  • the method includes: forwarding the message by using a signaling transfer point.
  • a protocol layer and a signaling point code of a SS7 protocol are configured;
  • a protocol layer of the SS7 protocol includes a signaling connection control layer and signaling The media gateway control protocol processing layer and the subsystem number of the connection control part application layer location configuration;
  • the media gateway control protocol processing layer is configured to interact with the signaling connection control layer, and use the signaling point coding and the subsystem number as a routing basis at least in a routing process of a part of the media gateway control protocol message.
  • the media gateway control protocol processing layer includes: a routing mode selecting unit, configured to select a routing manner in which the media gateway control protocol message is transmitted in the time division multiplexed network; and a media gateway control protocol message transmitting unit, configured to The media gateway control protocol message that determines the routing mode is sent to the signaling connection control part layer; the media gateway control protocol message receiving unit is configured to receive the media gateway control protocol message from the signaling connection control part layer.
  • the signaling connection control layer includes: a message receiving unit, configured to receive a media gateway control protocol message from a media gateway control protocol processing layer; and a segmentation unit, configured to control a media gateway whose length is greater than a predetermined length The protocol message is segmented; the data sending unit is configured to send the segmented message to the lower layer by using the data enhancement unit.
  • the signaling connection control layer includes: a data receiving unit, configured to receive enhanced unit data from a lower layer; and a recombining unit, configured to reassemble the received enhanced unit data into a media gateway control protocol message; And a unit, configured to send the reassembled message to the media gateway control protocol processing layer.
  • the network device is a softswitch or a media gateway.
  • a body gateway control system includes a softswitch and a media gateway, and the softswitch and the media gateway are configured with a protocol layer and a signaling point code of the SS7 protocol;
  • the protocol layer of the signaling protocol includes a signaling connection control part layer and a media gateway control protocol processing layer and a subsystem number configured in an application layer location of the signaling connection control part; the media gateway control protocol processing layer is used for signaling connection control
  • Some layers interact to use the signaling point coding and at least in the routing process of some Media Gateway Control Protocol messages.
  • the subsystem number is used as a routing basis.
  • the signaling point is used to identify the softswitch and the media gateway
  • the media gateway control protocol processing layer is set as an SCCP user
  • the partial message routing process uses the signaling point and the subsystem number as the routing basis. Therefore, when the network environment does not provide an IP bearer network or an ATM bearer network, the solution of the present invention can quickly utilize the original TDM network to quickly implement networking of the softswitch and the media gateway; and, the present invention does not require additional equipment, only A simple software upgrade of the softswitch and the MGW is required, which has a great cost advantage compared with the prior art solution; the present invention is simplified because the service control and the carrier separation can be implemented in the TDM network.
  • the upgrade of the TDM network makes the TDM network more convenient to maintain and saves transmission resources.
  • the solution of the present invention carries the MEGACO/H.248 protocol on the SS7 network, and can use the STP signaling handover, the real-time performance and reliability of the MEGACO/H.248 protocol packet transmission will be improved.
  • the present invention can use DPC+SSN or GT+SSN for message routing; segment and reload the excessively long media gateway control protocol message in the SCCP to implement bearer of the media gateway control protocol message by the TDM network.
  • FIG. 1 is a schematic diagram of a physical connection of a typical network of a service control and a bearer-separated network
  • FIG. 1 is a schematic diagram of a protocol hierarchy of an IP bearer network used between a soft switch and an MGW in the prior art
  • FIG. 4 is a partial schematic diagram of a signaling protocol layer of the prior art in FIG. 4
  • FIG. 5 is a schematic diagram of a softswitch implemented by using a TDM bearer network connection in the prior art
  • FIG. 1 is a schematic diagram of a physical connection of a typical network of a service control and a bearer-separated network
  • FIG. 1 is a schematic diagram of a protocol hierarchy of an IP bearer network used between a soft switch and an MGW in the prior art
  • FIG. 4 is a partial schematic diagram of a signaling protocol layer of the prior art in FIG. 4
  • FIG. 5 is a schematic diagram of a softswitch implemented by using a TDM bearer network connection in the
  • 6 is a schematic diagram of a physical connection of a network in a time slot of a TDM bearer network by using a router in a prior art scheme
  • 7 is a schematic diagram of a peer-to-peer protocol layer used by a softswitch and an MGW in a method of implementing media gateway control in a time division multiplexed network, in accordance with an embodiment of the present invention
  • FIG. 8 is a flow chart of a method of implementing media gateway control in a time division multiplexed network, in accordance with one embodiment of the present invention.
  • FIG. 9 is a block diagram of an embodiment of a network device of the present invention.
  • the embodiment of the solution of the present invention controls the media gateway.
  • the protocol (such as the H.248 protocol) is carried on the SS7 in the TDM network, and the STP can be used to implement the signaling transfer when transmitting offsite.
  • the MEGACO/H.248 protocol message is transmitted using a protocol layer based on SS7, and a Message Transfer Part ("MTP") signaling protocol is configured on the softswitch and the MGW.
  • Layer, softswitch and MGW both set a Sub-System Number (SSN) different from the SCCP application layer type in the other SS7 protocol layer, and perform H.248 protocol on the SCCP application layer. deal with.
  • SSN Sub-System Number
  • the signaling point setting used in the SS7 signaling is added to the softswitch and the MGW, and the softswitch is identified by the signaling point of the SS7 signaling.
  • message routing can be encoded using destination signaling points.
  • DPC Distribution Point Code
  • DPC+SSN subsystem number
  • the "GT” setting is routed to the peer using the global code and subsystem number (GT+SSN).
  • GT+SSN global code and subsystem number
  • Embodiments of the inventive solution can utilize SCCP segmentation and reassembly functions during the large packet transmission of the MEGACO/H.248 protocol, segmenting large data packets by the SCCP layer and using enhanced unit data ( Extended Unit Data)
  • the message "XUDT” is sent to the peer end, and is reassembled by the SCCP layer of the peer end and sent to the SCCP application layer of the peer end for H.248. Protocol processing.
  • the solution of the present invention greatly simplifies the upgrade of the TDM network, thereby making the TDM network more convenient to maintain and saving transmission resources;
  • the solution of the present invention can quickly utilize the original TDM network to quickly implement networking of the softswitch and the media gateway.
  • the present invention does not require additional equipment. It can be realized only by a simple software upgrade of the softswitch and the MGW, which has a great cost advantage compared with the prior art solution.
  • the solution of the present invention carries the MEGACO/H.248 protocol on the seventh signaling Online, and can use STP signaling transfer, will greatly improve the real-time and reliability of MEGACO / H.248 protocol packet transmission.
  • the upper limit of the MTP3 packet is 306 bytes, and a MEGACO/H.248 protocol packet is about 1000 bytes, the MEGACO/H.248 protocol packet cannot be carried on the MTP3, so consider it. It is carried on the SCCP and utilizes the SCCP segmentation reassembly function to realize the transmission of message packets.
  • a peer-to-peer protocol layer used by the softswitch and the MGW in the method of implementing the media gateway control protocol in the time division multiplexing network according to an embodiment of the present invention is as shown in FIG.
  • a physical layer 710, an MTP2 720, an MTP3 730, an SCCP layer 740, an H.248 processing layer 750, and a service layer 760 are included.
  • the peer-to-peer protocol layer used by the softswitch and the MGW in the embodiment of the present invention is implemented based on the SS7 protocol layer shown in FIG. 4, but the SCCP application layer in the embodiment of the present invention is H. .248 processing layer.
  • the H.248 processing layer is similar to the BSSAP in the prior art for processing the MEGACO/H.248 protocol. .
  • the H.248 processing layer is also referred to as a media gateway application part.
  • a flow of a method of implementing a media gateway control protocol in a time division multiplexed network according to an embodiment of the present invention is shown in FIG. First, proceeding to step 810, the service layer sends a message to the H.248 processing layer.
  • the transmitting end is a soft switch
  • the receiving end is an MGW.
  • the service layer of the softswitch generates a message requesting the MGW to create an endpoint, that is, an H.248 ADD message needs to be sent to the MGW.
  • the H.248 processing layer generates an H.248 message.
  • the H.248 processing layer groups the cells of the service layer ADD message into an ADD message of the H.248 protocol according to the MEGACO/H.248 protocol.
  • the ADD message of the general H.248 protocol is approximately 700 to 1000 bytes in length.
  • the H.248 processing layer selects a routing mode and sends an H.248 message to the SCCP layer.
  • the routing mode may be a DPC+SSN route or a GT+SSN route, where the SSN is a media gateway application part, that is, a service subsystem number of the H.248 processing layer, and the SSN is different from other SCCP application layers.
  • the value of the SSN is not the same as the existing existing SCCP application layer. In an embodiment of the present invention, the SSN is 88.
  • DPC+SSN routing if DPC+SSN routing is used, DPC and SSN need to be configured for the softswitch and the MGW, and the DPC used for the routing is the DPC of the receiving end MGW; if the GT+SSN routing is used, the configuration is disabled. At the DPC, the GT and SSN need to be configured for the softswitch and the MGW in advance.
  • the GT used for the route is the GT of the receiving end MGW.
  • the global code can be used in the middle, but the last segment still needs to find the destination by using the signaling point.
  • a DPC of the domestic backup network may be adopted to reduce the occupation of the DPC of the domestic network.
  • the H.248 processing layer sends the H.248 message to the SCCP layer and also indicates its SSN.
  • the SCCP layer processes according to the length of the received message packet according to the SCCP protocol.
  • the SCCP determines the size of the message packet, and the message packet of more than 255 bytes is automatically segmented according to the SCCP protocol and transmitted using the XUDT message.
  • the lower layer forwards the message in the SS7 network according to the SS7 protocol.
  • the segmented XUDT message is forwarded to the peer layer of the receiving end in the SS7 network through the lower layer protocol.
  • the processing method in this step is the processing method of the existing SS7 network, and will not be described in detail.
  • the process proceeds to step 860, and the peer SCCP layer completes the SCCP protocol processing of the received message and reports the message to the H.248 processing layer.
  • the SCCP layer of the receiving end MGW receives the XUDT message, initiates the reloading mechanism according to the SCCP protocol, and after the complete reinstallation, determines that the SCCP SSN is the media gateway application part, and uses the UDT to indicate the primitive, The message is sent to the H.248 processing layer.
  • the peer media gateway application part determines the source of the message according to the signaling point and performs corresponding H.248 protocol processing.
  • the peer service layer performs corresponding processing according to the lower layer receiving message.
  • MGCF Media Gateway Control Function
  • MSC Media Gateway Controller
  • FIG. 9 is a block diagram of an embodiment of a network device of the present invention.
  • the network device configures a protocol layer and a signaling point code of the SS7 protocol;
  • the protocol layer of the SS7 protocol includes a signaling connection control part layer 910 and a media configured at an application layer location of the signaling connection control part
  • the media gateway control protocol processing layer 920 is configured to interact with the signaling connection control layer 910, and use the signaling point coding and the subsystem number as a routing basis at least in a routing process of a part of the media gateway control protocol message. .
  • the media gateway control protocol processing layer 920 includes: a routing mode selecting unit 921, configured to select a routing manner in which a certain gateway control protocol message is transmitted in a time division multiplexed network; a control protocol message transmitting unit 922, configured to transmit a media gateway control protocol message that determines a routing manner to the signaling connection control part layer 910; a media gateway control protocol message receiving unit 923, configured to receive control from the signaling connection The media gateway control protocol message of the partial layer 910.
  • the signaling connection control part layer 910 includes: a message receiving unit 911, configured to receive a media gateway control protocol message from the media gateway control protocol processing layer 920; and a segmentation unit 912, configured to: The media gateway control protocol message whose length is greater than the predetermined length is segmented; the data sending unit 913 is configured to send the segmented message to the lower layer (not shown) by using the data enhancement unit.
  • the signaling connection control part layer 910 includes: a data receiving unit 914, configured to receive enhanced unit data from a lower layer; and a recombining unit 915, configured to reassemble the received enhanced unit data into The media gateway control protocol message; the message sending unit 916 is configured to send the reassembled message to the media gateway control protocol processing layer 920.
  • the network device can be a softswitch or a media gateway, and details are not described herein. While the invention has been illustrated and described with reference to the preferred embodiments embodiments The spirit and scope of the invention.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé, un dispositif et un système de mise en œuvre de commande de passerelle multimédia dans le réseau TDM, qui sont généralement appliqués dans la technologie de transport du protocole de communication, permettent que la signalisation No.7 du réseau TDM actuel transporte directement le protocole de commande de la passerelle. Utilisation du point de signalisation pour identifier le commutateur logiciel et la passerelle multimédia, configuration de la couche de traitement du protocole de commande de la passerelle multimédia comme un type d’utilisateurs SCCP, un partie de la procédure de routage du message utilise le point de signalisation et le numéro de sous-système comme base de la route. En conséquence, lorsqu’un réseau à porteuse IP ou un réseau à porteuse ATM n’est pas fourni dans l’environnement réseau, le réseau TDM actuel est rapidement utilisé et l’on réalise rapidement la mise en réseau du commutateur logiciel et de la passerelle multimédia.
PCT/CN2006/002687 2005-10-20 2006-10-12 Procede, dispositif et systeme de mise en oeuvre de commande de passerelle multimedia dans le reseau tdm WO2007045153A1 (fr)

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CN200510118224.3 2005-10-20
CN200510118224.3A CN100546302C (zh) 2005-10-20 2005-10-20 在时分多路复用网络中实现媒体网关控制协议的方法

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US20040062271A1 (en) * 2002-09-26 2004-04-01 Oliver Neal C. Method and system for providing control and monitoring functionality for a telecommunication switching domain
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