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WO2001011825A2 - Communications utilisant des reseaux hybrides a commutation de circuits et a commutation de paquets - Google Patents

Communications utilisant des reseaux hybrides a commutation de circuits et a commutation de paquets Download PDF

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Publication number
WO2001011825A2
WO2001011825A2 PCT/US2000/040568 US0040568W WO0111825A2 WO 2001011825 A2 WO2001011825 A2 WO 2001011825A2 US 0040568 W US0040568 W US 0040568W WO 0111825 A2 WO0111825 A2 WO 0111825A2
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WO
WIPO (PCT)
Prior art keywords
packet network
circuit
narrowband
switched
gateway
Prior art date
Application number
PCT/US2000/040568
Other languages
English (en)
Other versions
WO2001011825A3 (fr
WO2001011825A9 (fr
Inventor
Dale Scholtens
Anita B. Marsh
David Wells
Robert Roden
Original Assignee
Tellabs Operations, Inc.
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 Tellabs Operations, Inc. filed Critical Tellabs Operations, Inc.
Priority to AU76281/00A priority Critical patent/AU7628100A/en
Priority to CA002379437A priority patent/CA2379437A1/fr
Publication of WO2001011825A2 publication Critical patent/WO2001011825A2/fr
Publication of WO2001011825A3 publication Critical patent/WO2001011825A3/fr
Publication of WO2001011825A9 publication Critical patent/WO2001011825A9/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/4608—LAN interconnection over ATM networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5614—User Network Interface
    • H04L2012/5618—Bridges, gateways [GW] or interworking units [IWU]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/563—Signalling, e.g. protocols, reference model
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5632—Bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5663—Support of N-ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671—Support of voice
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13106—Microprocessor, CPU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13166—Fault prevention
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13176—Common channel signaling, CCS7
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1319—Amplifier, attenuation circuit, echo suppressor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13196—Connection circuit/link/trunk/junction, bridge, router, gateway
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1327—Release and resetting of connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1329—Asynchronous transfer mode, ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13367—Hierarchical multiplexing, add-drop multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13383—Hierarchy of switches, main and subexchange, e.g. satellite exchange
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13399—Virtual channel/circuits

Definitions

  • the invention relates to communications using hybrid circuit-switched and packet-switched networks.
  • a traditional telephone exchange configuration provides circuit connections between remote locations.
  • Many of the telecommunications networks currently used are synchronous digital networks. Digitized voice communications are transmitted synchronously over the networks at a fixed rate. Discrete time periods (time slots) are packed with the digital information for a particular call, and digital information for multiple calls can be packed sequentially to form a time division multiplexed (TDM) data stream.
  • the connections may be provided, for example, using network switches having dedicated inter-switch connections. Because the number of inter-switch connections is static, the number of incoming circuits that can be routed to each output port of the exchange also is static.
  • ATM ATM networks
  • ATM networks allow connections to be made between endpoints without dedicated inter-switch connections.
  • Fixed-size packets of data known as cells, are transferred between the ATM switches, which are packet switches that provide virtual circuits between the end points of a network.
  • the virtual circuits may be reconfigured depending upon data traffic volume.
  • an ATM network can provide a more efficient way to connect end points in a network with rapidly changing connectivity requirements, such as a telephone system.
  • a method of communicating includes transporting circuit-switched narrowband traffic over a packet network and delivering the narrowband traffic from the packet network to a circuit-switched network.
  • the connection through the packet network for the narrowband traffic can be provided dynamically.
  • Multiple circuit-switched narrowband calls can be multiplexed over a single connection in the packet network.
  • a method of establishing a path for narrowband traffic includes establishing a packet network connection between first and second interface points in one or more circuit-switched networks.
  • the packet network connection is associated with a narrowband circuit allocated to service the narrowband traffic.
  • the packet network connection can include a switched virtual connection.
  • An identification code that uniquely identifies a narrowband circuit allocated to service the traffic can be forwarded between first and second gateways configured to perform adaptations between circuit-switched signals and packet-switched bearers.
  • the identification code can be forwarded from the first gateway to the second gateway, for example, using Signaling System 7 (SS7) messages.
  • SS7 Signaling System 7
  • the identification code can include a DSO circuit identification code.
  • the method also can include identifying a channel in the packet network connection over which the narrowband traffic is to be sent.
  • the narrowband circuit allocated to service the call can be associated with the channel in the packet network connection.
  • a method of communicating includes multiplexing multiple circuit-switched narrowband calls over a single packet network connection and releasing resources allocated to service a particular one of the circuit-switched calls. For example, resources in the packet network servicing the particular circuit-switched call can be released once the call is terminated.
  • a communications system also is disclosed and can include at least one circuit-switched network including first and second interface points, a packet network, and gateways coupled respectively to the interface points and the packet network.
  • the gateways are configured to perform adaptations between circuit-switched bearers and packet-switched bearers.
  • the system includes at least one controller arranged to provide call control signals to allow a packet network connection to be established between the first and second interface points and to allow the packet network connection to be associated with a narrowband circuit allocated to service narrowband traffic that is to be transported across the first and second interface points.
  • the techniques can be used with different types of packet networks.
  • Service providers can consolidate circuit-switched and variable bit rate data services over a single, broadband network.
  • High-quality narrowband services can be delivered over packet and cell networks, such as ATM and Internet Protocol (IP).
  • IP Internet Protocol
  • the system can support voice or other narrowband calls over an ATM or IP backbone network, while interfacing seamlessly with an existing SS7- based public telephone network that uses circuit-switched technology. It also can provide better network utilization by ensuring that bandwidth is allocated where it is needed and not stranded in dedicated trunks as it is with circuit-switched networks.
  • FIG. 1 is a block diagram of a telephone connection through a hybrid ATM network and an associated signaling network.
  • FIG. 2 is a simplified block diagram of an exemplary media gateway.
  • FIG. 3 shows an exemplary conversion of a digital telephone signal bit stream into ATM cells.
  • FIG. 4 is a flow chart of a voice call set up process between TDM circuit switches over an ATM network.
  • FIG. 5 is a signal flow diagram for a voice call set up process between TDM circuit switches over an ATM network.
  • FIG. 6 is a signal flow diagram illustrating details of establishing a packet- domain connection for the voice call set up process of FIG. 5.
  • FIG. 7 is a signal flow diagram for an alternative voice call set up process between TDM circuit switches over an ATM network.
  • FIG. 8 is a signal flow diagram for a call set up process in which multiple TDM calls share a single ATM connection.
  • FIG. 9 is a signal flow diagram for releasing a voice call over an ATM connection.
  • a call control mechanism for carrying narrowband traffic such as voice calls, modem data or facsimile data, over an asynchronous transfer mode (ATM) or other packet network connection is described below.
  • ATM asynchronous transfer mode
  • a switching system is described that supports narrowband calls over a packet backbone network, while interfacing seamlessly with an existing SS7-based public telephone network that uses circuit-switched technology.
  • a continuous call path is established starting with a narrowband Signaling System 7 (SS7) call that originates, for example, in a Public Switched Telephone Network (PSTN) 102A.
  • the path is established using a virtual circuit over an ATM network 101 and completes on the terminating side in a narrowband circuit-switched SS7 call to the terminating subscriber through another circuit switched network 102B.
  • the control mechanism interacts with the circuit- switched and packet-switched networks to correlate SS7 and ATM connections to establish a single continuous information path.
  • a large number of individual telephone circuits, such as DSO circuits, that are to be connected to the packet network 101 can be carried, for example, on fiber optic carriers 105 using time-division multiplexing (TDM) according to the Telcordia Synchronous Optical Network (SONET) standards.
  • TDM time-division multiplexing
  • SONET Telcordia Synchronous Optical Network
  • the gateways 100A, 100B can adapt the TDM telephone line signals to packet-based signals and vice-versa.
  • Each gateway 100A, 100B can separate incoming TDM signals into individual DSO signal streams.
  • the TDM telephone signals are circuit-switched, in other words, the bit stream can be divided temporally into individual DSO circuits.
  • the bit stream in packet-based signals, the bit stream can be divided according to the destination address of each packet.
  • each gateway such as the gateway 100A, includes a TDM switching matrix 117 that provides full switching capabilities.
  • the switching matrices 117 permit the DSO circuits to be interconnected flexibly with narrowband channels appearing on the gateways. Echo cancellation and other digital signal processing functions can be performed in a digital signal processing portion 118 of each gateway.
  • the DSO streams are adapted by an ATM adaptation layer 120 into ATM cells.
  • the ATM adaptation layer 120 combines incoming DSO signals from a particular carrier 105 into payloads 132 for ATM cells 130.
  • a header 134 is provided as part of each cell 130 and can be interpreted by the gateway to identify which call the ATM cell is associated with.
  • Each gateway includes a control section 119 that controls overall operation of the gateway.
  • the gateways 100A, 100B are implemented as Salix 7720 Class- Independent Switches available from Tellabs Operations, Inc.
  • each gateway 100A, 100B is connected to a respective ATM end point switch 115.
  • the connection between a gateway and an ATM end point switch 115 and the connection between the ATM end point switch and the ATM network 101 are user-network interfaces (UNIs).
  • UNIs user-network interfaces
  • NNIs network-node interfaces
  • a call control network 126 which forms part of an existing telephone system, runs parallel to the voice network.
  • the call control network 126 primarily controls telephone switching equipment to connect the originating and terminating ends of a telephone call using SS7 messages.
  • a call controller 120A, 120B is coupled to each gateway 100A, 100B and provides an interface between the gateway and the call control network 126. As discussed below, the exchange of call control signals allows the gateways 100A, 100B to establish a connection through the ATM network 101 to enable the transmission of narrowband traffic between the end points.
  • a user at the originating end dials 210 a telephone number.
  • a connection is established through an originating TDM circuit switch in the circuit switched network 102A, and the call controller 120A at the originating end receives 215 an SS7 initial address message (IAM) 150.
  • the call controller 120A routes the call, in other words, it identifies a call controller 120B associated with a terminating DSO circuit in the circuit switched network 102B.
  • the call controller 102A sends 220 a connection control message (CreateConn) 152 to the originating gateway 100A to initiate a connection through the ATM network 101.
  • ReateConn connection control message
  • the gateway 100A returns 225 an acknowledgement message (CreateAck) 154 that includes a connection descriptor ("conndesc").
  • the connection descriptor includes an ATM address for the gateway 100A as well as information that uniquely identifies the call.
  • the information that uniquely identifies the call can identify a connection-related resource such as the narrowband circuit (e.g., DSO circuit) handling the call on the originating side.
  • the call controller 120A sends 230 an IAM message 156 to the terminating call controller 120B.
  • the message 156 includes the information contained in the connection descriptor.
  • the terminating call controller 120B routes the call.
  • the terminating call controller 120B selects a TDM circuit on a particular gateway, such as the gateway 100B, to handle the call.
  • the call controller 120B then sends 235 a connection control message (CreateConn) 158 to the terminating gateway 100B.
  • the CreateConn message 158 also includes the information contained in the connection descriptor.
  • the terminating gateway 100B establishes 240 a packet domain connection with the originating gateway 100A through the packet network 101.
  • ATM Setup messages e.g., UNI Setup and PNNI Setup messages
  • a UNI Setup message 160 is passed from the terminating gateway 100B to a first ATM switch 115.
  • PNNI or B-ISUP Setup messages 162 are sent from one ATM switch 110, 115 to the next ATM switch 110, 1 15 in the network 101.
  • a UNI Setup message 164 is sent from the last ATM switch 115 to the originating gateway 100A.
  • Each of the UNI Setup and PNNI Setup messages 160, 162, 164 includes the information contained in the connection descriptor so that each network element in the packet domain connection is informed of the connection identifier that uniquely identifies the narrowband voice call.
  • the originating gateway 100A then associates 245 the packet-domain connection with the circuit-domain connection.
  • the gateways 100A, 100B and ATM switches 110, 115 also negotiate the ATM routing headers that will be used between hops along the packet-domain connection.
  • Various UNI connect messages 166, 174 and PNNI connect messages 170, as well as connect acknowledgement (Connect Ack) 168, 172, 176 messages can be used, as shown in FIG. 6.
  • a control message (CreateAck) 178 then is sent by the terminating gateway 100B to the terminating call controller 120B to acknowledge that the packet-domain connection has been established for the voice call.
  • the terminating call controller 120B sends 250 a message to the originating call controller 120A to acknowledge that a connection has been established.
  • the terminating call controller 120B also sends 255 a message to the terminating TDM circuit switch in the circuit switched network 102B to establish a connection to the called party's telephone set.
  • Standard SS7 signaling occurs 260 between the terminating and originating ends to complete the voice call.
  • the information contained in the connection descriptor can, therefore, be used to permit the implementation of a switching system that supports narrowband calls over an ATM or other packet backbone network, while interfacing seamlessly with an existing SS7- based public telephone network that uses circuit-switched technology.
  • both the originating and terminating gateways 100A, 100B may share a common call controller, such as the call controller 120A.
  • a technique similar to that discussed above can be used with a single call controller performing the functions of both call controllers 120 A, 120B.
  • the call controller 120A routes the call after receiving the IAM message 150 (FIG. 5), it selects the terminating TDM circuit switch and the corresponding terminating gateway 100B to handle the call.
  • the IAM message 156 need not be used.
  • the packet-domain connection is established in the upstream (or backward) direction, in other words, from the terminating gateway 11 OB to the originating gateway 110A. That technique is particularly advantageous for minimizing the number of SS7 messages and, therefore, increasing the capacity of the call controllers to handle a greater number of calls.
  • establishing the packet- domain connection in the upstream direction can limit the ability of the originating carrier to select the optimal route for the call.
  • the packet-domain connection can be established in the downstream (or forward) direction, in other words, from the originating gateway 100A to the terminating gateway 100B as illustrated in FIG. 7.
  • a connection is established through an originating TDM circuit switch in the circuit switched network 102A, and the call controller 120A at the originating end receives an IAM message 180.
  • the call controller 120A routes the call, in other words, it identifies the call controller 120B associated with a terminating DSO circuit in the circuit switched network 102B.
  • the call controller 102A sends an IAM message 182 to the terminating call controller 120B requesting that a connection be established for the call.
  • the terminating call controller 120B routes the call.
  • the terminating call controller 120B selects a TDM circuit on a particular gateway, such as the gateway 100B, to handle the call.
  • the call controller 120B then sends a connection control message (CreateConn) 184 to the terminating gateway 100B to initiate the packet-domain connection.
  • the gateway 100B returns an acknowledgment message (CreateAck) 186 that includes a connection descriptor ("conndesc").
  • the connection descriptor includes an ATM address for the terminating gateway 100B, as well as a connection identifier that uniquely identifies the connection-related resource (e.g., the DSO circuit) handling the call on the terminating side.
  • the call controller 120B then sends an SS7 facility (FAC) or other ISUP message 188 to the originating call controller 120A.
  • the message 188 includes the information contained in the connection descriptor.
  • the originating call controller 120A Upon receiving the IAM message 188, the originating call controller 120A sends a connection control message (CreateConn) 190 to the originating gateway 100A.
  • the message 190 also includes the information contained in the connection descriptor.
  • the originating gateway 100A establishes a packet-domain connection with the terminating gateway 100B through the packet network 101.
  • the details for establishing the packet-domain connection in the ATM network 101 are similar to those illustrated in FIG. 6, except that the connection is established in the forward direction rather than in the backward direction.
  • a connection control message (CreateAck) 192 is sent from the gateway 100A to the call controller 120A.
  • the information contained in the connection descriptor is used to permit the implementation of a connection that supports voice calls over an ATM backbone network, while interfacing seamlessly with an existing SS7-based public telephone network that uses circuit-switched technology.
  • the terminating gateway 100B can associate the packet-domain connection with the circuit-domain connection. Standard SS7 signaling can be used to complete the voice call. If both gateways 100A, 100B share a common call controller, then the SS7 messages 182, 188 can be eliminated. The techniques described above can be used in cases where one narrowband call is assigned per ATM channel.
  • the setup messages for the packet-domain connection explicitly indicate which ATM virtual channel connection (VCC) to use, and the connection ID allows the gateway to associate the new VCC with the correct narrowband call.
  • VCC virtual channel connection
  • the connection ID allows the gateway to associate the new VCC with the correct narrowband call.
  • three distinct items must be identified: the narrowband call, the ATM connection, and the particular channel within the ATM cell that is associated with the call.
  • the connection can be established as previously described with the additional use of a network call correlation identifier (NCCI) to identify the specific ATM VCC.
  • NCCI network call correlation identifier
  • the terminating gateway 100B when the terminating gateway 100B establishes the packet-domain connection through an ATM Setup message, it includes the NCCI which then is communicated to the originating gateway 100A. Both gateways 100A, 100B store the NCCI and associate it with the specific ATM VCC.
  • ATM Setup messages are not required because the ATM connection already has been established. Therefore, another mechanism is provided to communicate to the originating gateway 100A which channel to use in the ATM VCC. As shown in FIG. 8, establishing a voice call over the same ATM VCC initially can proceed in the same manner as described previously with respect to FIG. 5. In other words, the messages 152, 154, as well as the messages 154, 156 and 158 that contain the information for the connection descriptor (conndesc), are sent as previously described. Upon receiving the CreateConn message 158, the terminating gateway 100B recognizes the originating gateway 100A as the source of the call and determines that there already is an active VCC to the gateway 100A.
  • the terminating gateway 100B then allocates a TDM circuit switch in the network 102B to be used for the current call.
  • the gateway 100B also determines the NCCI of the ATM VCC to be used.
  • the gateway selects an unused channel in the VCC and determines the channel identifier (CID).
  • the NCCI and the CID are communicated to the originating gateway 100A.
  • the termination gateway 100B returns a connection control message (CreateAck) 300 to the terminating call controller 120B.
  • the message 300 includes the information contained in the original connection descriptor (conndesc), as well as the NCCI, the CID and the ATM address for the terminating gateway 100B.
  • the call controller 120B then sends an FAC or other SS7 message 302 to the originating call controller 120A.
  • the message 302 forwards the information contained in the connection descriptor (conndesc), as well as the NCCI, the CID and the ATM address for the terminating gateway 100B, to the call controller 120A.
  • the call controller 120A sends a message (ModifyConn) 304 to the originating gateway 100A.
  • the message 304 also includes the information contained in the connection descriptor (conndesc), as well as the NCCI, the CID and the ATM address for the terminating gateway 100B.
  • the gateway 100A uses that information to associate the previously allocated TDM circuit with the correct ATM VCC (as indicated by the NCCI) and the correct channel within the VCC (as indicated by the CID).
  • the gateway 100A sends a message (Modify Ack) 306 to the call controller 120A to acknowledge the association of the circuit-switched connection with the particular channel in the ATM VCC.
  • FIG. 9 illustrates a process of releasing a call, for example, when the party that initiated the call hangs up its telephone set.
  • the originating TDM circuit switch sends an SS7 release message (REL) 310 to the call controller 120A identifying which DSO circuit was handling the call.
  • the call controller 120A sends a delete message (DEL) 312 to the originating gateway 100A.
  • the message 312 includes the information contained in the connection descriptor (conndesc), as well as the NCCI and the CID, to identify the call that is being terminated, the ATM VCC and the particular channel within the VCC.
  • the gateway 100A then returns a message (Delete Ack) 316 to the originating call controller 120A to indicate that the ATM channel identified by the CID is now free and that the gateway no longer contains an association between the TDM circuit switch and the ATM channel used for the call.
  • the call controller 120A recognizes that the TDM trunk previously used for the call is now idle and is available to be used for other telephone calls.
  • the call controller 120A receives the Delete Ack message 316, it sends an SS7 release complete message (RLC) 318 to the originating TDM circuit switch.
  • RLC SS7 release complete message
  • the gateway 100A also may initiate UNI/NNI signaling 314 to release the internal resources dedicated to the ATM connection.
  • the UNI/NNI release message is relayed through the ATM network 101.
  • Each ATM switch 110 receives the release message, releases the path for the connection, and responds with a release complete message.
  • the call controller 120A also sends an SS7 message (REL) 320 to the terminating call controller 120B.
  • the REL message 320 includes the information contained in the connection descriptor, as well as the NCCI and the CID, to identify the call that is being terminated, the ATM VCC and the particular channel within the VCC.
  • the terminating call controller 120B When the terminating call controller 120B receives the REL message 320, it sends a message (Delete) 322 to the terminating gateway 100B.
  • the Delete message 322 also includes the information contained in the connection descriptor, as well as the NCCI and the CID.
  • the gateway 100B returns a message (Delete Ack) 324 to the terminating call controller 120B to indicate that the ATM channel identified by the CID is now free and that the gateway no longer contains an association between the terminating TDM circuit switch and the ATM channel used for the call.
  • the terminating call controller 120B recognizes that the packet trunk previously used for the call is now idle and can be used for other calls.
  • the terminating call controller 120B sends an SS7 release message (REL) 326 to the terminating ATM circuit switch and sends a release complete message (RLC) 328 to the originating call controller 120A.
  • the terminating TDM circuit switch returns an SS7 release complete message (RLC) 330 to the call controller 120B, which recognizes that the terminating TDM trunk is now idle and can be used for other telephone calls. Release of the resources associated with the call is completed.
  • some of the messages such as the CreateConn, Create Ack, Delete, Delete Ack, Modify and Modify Ack, are Media Gateway Control Protocol (MGCP) messages, although other protocols can be used as well.
  • MGCP Media Gateway Control Protocol
  • circuit-switched traffic can be routed over other packet-domain networks, such as frame relay, Ethernet and Internet Protocol (IP) networks, as well.
  • packet-domain networks such as frame relay, Ethernet and Internet Protocol (IP) networks
  • Various features of the system can be implemented in hardware, software, or a combination of hardware and software.
  • some aspects of the system can be implemented in computer programs executing on programmable computers.
  • Each program can be implemented in a high level procedural or object-oriented programming language to communicate with a computer system.
  • each such computer program can be stored on a storage medium, such as read-only- memory (ROM) readable by a general or special purpose programmable computer, for configuring and operating the computer when the storage medium is read by the computer to perform the functions described above.
  • ROM read-only- memory

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

Abstract

La présente invention concerne des techniques de communications qui consistent à transporter le trafic de bande étroite à commutation de circuits dans un réseau à commutation de paquets (101) et à acheminer le trafic à bande étroite du réseau à commutation de paquets à un réseau à commutation de circuits (102B). Le trafic à bande étroite à commutation de circuits peut être transporté de façon dynamique dans un réseau à commutation de paquets (101), les appels à bande étroite à commutation de circuits multiples pouvant être multiplexés dans une seule connexion du réseau à commutation de paquets. En outre, un système mettant en oeuvre ces techniques peut prendre en charge des données vocales ou d'autres appels à bande étroite dans un réseau principal à commutation de paquets, tout en étant en interface transparente avec un réseau téléphonique SS7 (126) utilisant une technologie de commutation de circuits.
PCT/US2000/040568 1999-08-06 2000-08-04 Communications utilisant des reseaux hybrides a commutation de circuits et a commutation de paquets WO2001011825A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU76281/00A AU7628100A (en) 1999-08-06 2000-08-04 Communications using hybrid circuit-switched and packet-switched networks
CA002379437A CA2379437A1 (fr) 1999-08-06 2000-08-04 Communications utilisant des reseaux hybrides a commutation de circuits et a commutation de paquets

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14746299P 1999-08-06 1999-08-06
US60/147,462 1999-08-06

Publications (3)

Publication Number Publication Date
WO2001011825A2 true WO2001011825A2 (fr) 2001-02-15
WO2001011825A3 WO2001011825A3 (fr) 2001-07-05
WO2001011825A9 WO2001011825A9 (fr) 2001-10-11

Family

ID=22521658

Family Applications (4)

Application Number Title Priority Date Filing Date
PCT/US2000/040568 WO2001011825A2 (fr) 1999-08-06 2000-08-04 Communications utilisant des reseaux hybrides a commutation de circuits et a commutation de paquets
PCT/US2000/040570 WO2001011836A1 (fr) 1999-08-06 2000-08-04 Lignes privees traversant un reseau de paquets et reorganisation de canaux dans des connexions de reseau de paquets
PCT/US2000/040569 WO2001011835A1 (fr) 1999-08-06 2000-08-04 Gestion de largeur de bande dans un systeme de communications utilisant des reseaux a commutation de circuits et a commutation de paquets
PCT/US2000/040571 WO2001011853A2 (fr) 1999-08-06 2000-08-04 Integrite de circuit dans un reseau a commutation de paquets

Family Applications After (3)

Application Number Title Priority Date Filing Date
PCT/US2000/040570 WO2001011836A1 (fr) 1999-08-06 2000-08-04 Lignes privees traversant un reseau de paquets et reorganisation de canaux dans des connexions de reseau de paquets
PCT/US2000/040569 WO2001011835A1 (fr) 1999-08-06 2000-08-04 Gestion de largeur de bande dans un systeme de communications utilisant des reseaux a commutation de circuits et a commutation de paquets
PCT/US2000/040571 WO2001011853A2 (fr) 1999-08-06 2000-08-04 Integrite de circuit dans un reseau a commutation de paquets

Country Status (3)

Country Link
AU (4) AU7628400A (fr)
CA (4) CA2379093A1 (fr)
WO (4) WO2001011825A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7743131B2 (en) 2000-06-01 2010-06-22 Tekelec Methods and systems for managing status audit messages in a gateway routing node
US9043451B2 (en) 2007-07-31 2015-05-26 Tekelec, Inc. Methods, systems, and computer readable media for managing the flow of signaling traffic entering a signaling system 7 (SS7) based network
US9088478B2 (en) 2010-02-12 2015-07-21 Tekelec, Inc. Methods, systems, and computer readable media for inter-message processor status sharing

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US7050456B1 (en) 1998-12-04 2006-05-23 Tekelec Methods and systems for communicating signaling system 7 (SS7) user part messages among SS7 signaling points (SPs) and internet protocol (IP) nodes using signal transfer points (STPs)
US6944184B1 (en) 1998-12-04 2005-09-13 Tekelec Methods and systems for providing database node access control functionality in a communications network routing node
US7002988B1 (en) 1998-12-04 2006-02-21 Tekelec Methods and systems for communicating SS7 messages over packet-based network using transport adapter layer interface
WO2004102966A1 (fr) * 2003-05-13 2004-11-25 Samsung Electronics Co., Ltd. Procede de securite pour service de diffusion dans un systeme de communication mobile
US7804789B2 (en) 2004-03-18 2010-09-28 Tekelec Methods, systems, and computer program products for organizing, managing, and selectively distributing routing information in a signaling message routing node
US7532647B2 (en) 2004-07-14 2009-05-12 Tekelec Methods and systems for auto-correlating message transfer part (MTP) priority and internet protocol (IP) type of service in converged networks
GB0808447D0 (en) * 2008-05-12 2008-06-18 Nortel Networks Ltd A mechanism to divert an IP flow over a non-IP transport

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DK0736239T3 (da) * 1993-12-20 1999-05-10 At & T Corp ATM-net til smalbåndskommunikationer
US6031840A (en) * 1995-12-07 2000-02-29 Sprint Communications Co. L.P. Telecommunications system
US5751706A (en) * 1996-06-05 1998-05-12 Cignal Global Communications, Inc. System and method for establishing a call telecommunications path
US5953316A (en) * 1997-04-17 1999-09-14 The Trustees Of Columbia University In The City Of New York Reservation method and system for asynchronous transfer mode communications
US6822961B1 (en) * 1998-10-02 2004-11-23 Nortel Networks Limited Method and apparatus for reduction of call setup rate in an ATM network

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7743131B2 (en) 2000-06-01 2010-06-22 Tekelec Methods and systems for managing status audit messages in a gateway routing node
US9043451B2 (en) 2007-07-31 2015-05-26 Tekelec, Inc. Methods, systems, and computer readable media for managing the flow of signaling traffic entering a signaling system 7 (SS7) based network
US9088478B2 (en) 2010-02-12 2015-07-21 Tekelec, Inc. Methods, systems, and computer readable media for inter-message processor status sharing

Also Published As

Publication number Publication date
WO2001011853A9 (fr) 2002-08-01
CA2379093A1 (fr) 2001-02-15
WO2001011835A1 (fr) 2001-02-15
WO2001011853A2 (fr) 2001-02-15
AU7628400A (en) 2001-03-05
AU7628100A (en) 2001-03-05
WO2001011853A8 (fr) 2001-08-09
WO2001011825A3 (fr) 2001-07-05
WO2001011825A9 (fr) 2001-10-11
AU7628200A (en) 2001-03-05
CA2379437A1 (fr) 2001-02-15
AU7628300A (en) 2001-03-05
WO2001011853A3 (fr) 2001-05-03
CA2381467A1 (fr) 2001-02-15
CA2381464A1 (fr) 2001-02-15
WO2001011836A1 (fr) 2001-02-15

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