EP1277318A2 - Procede et passerelle permettant d'assurer le transfert des appels de communication sans fil - Google Patents

Procede et passerelle permettant d'assurer le transfert des appels de communication sans fil

Info

Publication number
EP1277318A2
EP1277318A2 EP01928629A EP01928629A EP1277318A2 EP 1277318 A2 EP1277318 A2 EP 1277318A2 EP 01928629 A EP01928629 A EP 01928629A EP 01928629 A EP01928629 A EP 01928629A EP 1277318 A2 EP1277318 A2 EP 1277318A2
Authority
EP
European Patent Office
Prior art keywords
switch network
handover
packet
communication device
gateway
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01928629A
Other languages
German (de)
English (en)
Inventor
Srinivas Sreemanthula
Stefano Faccin
Yousuf Saifullah
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Oyj
Original Assignee
Nokia Oyj
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 Nokia Oyj filed Critical Nokia Oyj
Publication of EP1277318A2 publication Critical patent/EP1277318A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/1225—Details of core network interconnection arrangements
    • H04M7/1235—Details of core network interconnection arrangements where one of the core networks is a wireless network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6421—Medium of transmission, e.g. fibre, cable, radio, satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6472—Internet

Definitions

  • This invention generally relates to packet switch (PS) networks and circuit
  • CS switch
  • IP telephony networks Voice or telephony services can now be provided over a packet-switched network, such as the Internet.
  • IP Internet Protocol
  • IP telephony networks are commonly referred to as IP telephony networks because the Internet Protocol (IP) is the primary protocol used over the Internet.
  • IP telephony standard is the
  • IP telephony network is known as a Voice over IP (VoIP) Network.
  • VoIP Voice over IP
  • the VoIP network may include a gatekeeper function, one or more gateways and a
  • the gatekeeper function may provide call authorization for both accepting and placing calls in its zone or area of control.
  • a gatekeeper can also allocate bandwidth, can maintain call detail
  • a packet-switched-telephony gateway bridges a circuit switch network such as the Public Switched Telephone Network (PSTN) and a packet-switch network such as an IP network or the Internet.
  • PSTN Public Switched Telephone Network
  • IP network such as an IP network or the Internet.
  • the IP telephony gateway bridges the PSTN and IP networks to allow phone-to-phone and phone-to-personal computer (PC),
  • PC personal computer
  • IP telephony voice, video and/or data.
  • IP telephony voice, video and/or data.
  • the IP telephony gateway provides the appropriate translation between transmission formats (for example, H.225.0 of an H.323 endpoint to/from H.221 of an H.320 endpoint) and between communication procedures (for example, H.245 of an H.323 endpoint to/from H.242 of an H.320 endpoint).
  • the IP telephony gateway also performs call setup and clearing on both the network side and the switch circuit network side.
  • IP-telephony gateway In general, the purpose of the IP-telephony gateway is to complete the call in both directions between the packet switch network endpoint and the circuit switch network endpoint in a transparent fashion.
  • IP telephony gateway An example of an IP telephony gateway is the H.323 gateway (implementing
  • the H.323 gateway allows interoperation of H.323 systems with other audio/video conferencing systems on Integrated Services Digital
  • IP telephony gateway operates as an IP telephony gateway
  • IP-telephony network that provides real-time, two-way communication between IP telephony terminals on the IP-based network and other
  • Switch circuit network connectivity may be achieved in the IP telephony context by using gateways for H.320 (ISDN), H.324, H.323, POTS, and other endpoints on IP telephony context.
  • H.320 ISDN
  • H.324, H.323, POTS IP-telephony gateways
  • Fig. 1 is a diagram illustrating an example call from a PSTN through an IP telephony network to another PSTN.
  • an IP telephony gateway here indicated as an originating IP telephony gateway
  • the gateway contacts the gatekeeper it is registered with asking to set up a call towards the dialed number received from the incoming call set up request (Access Request, ARQ, 2).
  • the gatekeeper translates the dialed number (or directory number) into the IP address of the destination IP-telephony gateway, (i.e.
  • the gateway that has to be reached in order to reach the final destination of the call) and provides this IP address to the originating IP telephony gateway (Access Confirmation, ACF, 3).
  • the originating IP-telephony gateway sets up an IP-telephony call over the packet switch network or IP network towards the destination IP-telephony gateway providing its IP address and the dialed number (Call setup, 3).
  • the destination IP-telephony gateway contacts the gatekeeper it is registered with (it may be the same as the originating IP-telephony gateway or a different gatekeeper) asking to accept a call incoming from the originating IP-telephony gateway
  • IP-telephony gateway (ARQ, 4) and directed towards the dialed number. If the gatekeeper grants the incoming call to the destination IP-telephony gateway (ACF, 5), the destination IP-telephony gateway establishes the PSTN call (call, 7), and then the call is established between the two IP-telephony gateways over the IP network (call establishment, 6). The destination IP-telephony gateway translates the IP packets into the appropriate format for transmission over the PSTN.
  • an object of the present invention to provide a communication device, such as a handover gateway, that provides handover of an active session
  • the packet switch network and the circuit switch network each may include a
  • the communication device may function as a terminating entity
  • a method may be provided that includes initiating an active session between
  • the method may further include
  • FIG. 1 shows an example call from a PSTN through an IP telephony network
  • FIG. 2 shows a packet switch network, a circuit switch network and a
  • handover gateway according to an example embodiment of the present invention in which the mobile communication device is located within the packet switch network;
  • FIG. 3 shows the components of the Figure 2 embodiment in which the mobile communication device is located within the circuit switch network
  • FIG. 4 shows an architecture of the handover gateway according to one
  • the active session(s) may be any type of session or call including but not limited to a voice call, a multimedia call, a facsimile call or video. More specifically, the present application is related to wireless telecommunication systems whose
  • circuit switch networks examples include GSM, ANSI-41 (in association
  • BSC serving base station controller
  • the mobile communication device may monitor the mobility of the mobile communication device during an active session(s) with the help of signal quality and strength measurements provided by
  • Measurement reports may indicate to the current BSC that the mobile communication device has moved to an area that is served (or
  • MSC mobile switching center
  • Execution of the handover may involve two phases.
  • the source BSC may initiate a set of signaling messages for the purpose
  • the handover signaling exchanged may involve the serving MSC (i.e., the anchor MSC), the target MSC and the target BSC to allocate network and radio resources for the call.
  • the serving MSC i.e., the anchor MSC
  • the target MSC i.e., the target MSC
  • the target BSC allocate network and radio resources for the call.
  • the mobile communication device is notified with the handover
  • the mobile communication device may act as the target BSC
  • the BSC may inform the anchor MSC through the target MSC about the
  • the anchor MSC may switch the user plane toward the target MSC. In this way, the user plane goes through the already established network path and radio connecting after finishing the complete signaling
  • packet switch networks examples include GPRS, EGPRS (EDGE), EDGE, GPRS, EGPRS (EDGE), EDGE
  • Mobility of the mobile communication device within GPRS is also well known.
  • GPRS General Packet Radio Service
  • the handover procedure in packet networks can be divided into two steps, namely radio connection establishment to the target cell and network path optimization.
  • the establishment of radio connection involves the source
  • the radio resources are allocated and the source BSC/RNC commands the mobile communication device to
  • the second step is triggered after the first step by the source BSC/RNC
  • the second step involves the transfer of serving GPRS support node (SGSN) context information from source to target SGSN and a packet data protocol (PDP) context update between the target SGSN and the gateway GPRS
  • SGSN serving GPRS support node
  • PDP packet data protocol
  • GGSN support node
  • the handover procedure in the GPRS network is performed as a procedure called hard handover with serving radio network system (SRNS) relocation.
  • SRNS serving radio network system
  • the first step may be
  • the radio network controller may involve the serving radio
  • SRNS network controller
  • handover may be performed when a link exists between the RNCs.
  • the present invention may allow a user (i.e., a mobile communication device) to perform handover when moving
  • IP based networks should be capable of supporting call (or session) handovers from circuit switch networks or to circuit switch networks. This may provide a quality service with wide network coverage and service continuity to their subscribers.
  • Embodiments of the present invention may be accomplished by an entity called a handover gateway such as the handover gateway 300 shown in Figure 2.
  • the handover gateway 300 provides a functionality between a packet switch network 100 and a circuit switch network 200 for the call (real time and non-real time) handover purposes.
  • the handover gateway 300 is a gateway for the conversion from packet data to the circuit connection and vice versa introduced for handover purposes. That is, the handover gateway 300 converts packet data units from the packet switch network to packet data units compatible with the circuit switch network 200 and vice versa.
  • the handover gateway 300 may exchange the handover related protocol signaling (e.g., GTP, RANAP, RNSAP, MAP, IS-41) that is supported in both packet switch and circuit switch networks to complete the handover procedure.
  • the handover gateway 300 may also maintain mapping between packet sessions and circuit connections. It may also handle subsequent handovers back to the network where the call (or session) was originally initiated.
  • Figure 2 shows an example packet switch network 100 and an example circuit switch network 200.
  • the handover gateway 300 provides a communications path between the packet switch network 100 and the circuit switch network 200.
  • the packet switch network 100 may include a router 102 coupled to a router 104 by a signal line 103.
  • the router 104 may be coupled to a node (i.e., a node B) 106 by a signal line 105.
  • the packet switch network 100 would likewise include other routers that are not shown.
  • the circuit switch network 200 may include an MSC 202 coupled to a radio access network (RAN) 204 by a signal line 203.
  • RAN radio access network
  • Other entities may also be provided within the circuit switch network 200.
  • the handover gateway 300 may be considered an entity of both the packet switch network 100 and the circuit switch network 200.
  • a mobile communication device 50 is shown physically within an area serviced by the packet switch network 100.
  • the active session may be initiated in a well known manner between a terminal 110 coupled to the router 102 and the mobile communication device 50.
  • the mobile communication device 50 may be any type of mobile entity (or terminal) including but not limited to a mobile phone, a pager or a mobile computation apparatus.
  • Information may be propagated through the packet switch network 100 from the terminal 110, along signal line 112 to the router 102, along the signal line 103 to the router 104 and along the signal line 105 to the node 106.
  • the node 106 may communicate with the mobile communication device 50 along the transmission path 55.
  • the transmission path 55 may include a wireless transmission path.
  • the mobile communication device 50 may physically move outside of the area serviced by the packet switch network 100.
  • Figure 3 shows that the
  • Embodiments of the present invention allow movement of the mobile communication device 50 during an active session(s) between the mobile communication device 50 and the terminal 110 without disconnection of the session(s).
  • the handover gateway 300 supports the handover.
  • the transmission path of the call may include a path from the terminal 110, along the signal path 112 to the router 102,
  • the handover gateway 300 also include a path from the handover gateway 300, along a signal line 220 to the MSC 202, along the signal line 203 to the RAN 204 and along the transmission path
  • the transmission path 57 may include a wireless transmission path.
  • the mobile communication device 50 has therefore moved from the packet
  • the mobile communication device 50 may subsequently move from the circuit switch network 200 back to the packet switch network 100 by utilizing the handover gateway 300 or another similar handover gateway 300.
  • the mobile communication device 50 may also physically move from the circuit switch network 200 to a different circuit switch network (not shown) using well known techniques such as that described above.
  • the present application is also applicable to the active session(s) being initiated while the mobile communication device 50 is within the circuit switch network 200.
  • the present invention allows the mobile communication device 50 to move from the circuit switch network 200 to the packet switch network 100 without disconnection of the active session(s). This is likewise accomplished through the use of the handover gateway 300.
  • Fig. 3 would show the mobile communication device 50 initially in the circuit switch network 200 and Fig. 2 would show the mobile communication device in the packet switch network 100 after handover.
  • the mobile communication device 50 may also physically move from the packet switch network 100 to a different packet switch network (not shown) using techniques such as that described above.
  • FIG. 4 shows an example architecture of the handover gateway 300. The below described
  • the handover gateway 300 may be coupled to a router or other entity within one of the networks or the handover gateway may be its own entity.
  • the handover gateway 300 may also function as an entity on both the packet switch side and the circuit switch side.
  • the handover gateway 300 may also be two or more separate network entities such as a generic router and a controlling handover control entity.
  • the handover gateway 300 may exchange packet switched (PS) related handover signaling 332 with the packet switch side of the network elements.
  • PS packet switched
  • the handover gateway 300 may perform appropriate conversions 330 or mapping between packet switch and circuit switch handover signaling 334.
  • the handover gateway 300 may also exchange circuit switch related handover signaling with the circuit switch side of the network elements (MSC).
  • MSC network elements
  • a mapping may be established between the media ports and circuit connections by providing the information to a gateway control unit 320 as shown in Figure 4.
  • the gateway control unit 320 may act as an admission control function to control the media conversions between circuit switch and packet switch data.
  • Internal control interfaces 322 and 324 may be used for communication within the handover gateway 300 and may be standardized interfaces like MGCP, Megaco etc. or vendor specific interfaces.
  • the handover gateway 300 may perform media conversion 310 between packet data 312 and the circuit (PCM) data formats 314 including transcoding and echo-cancellation. Specifically, the handover gateway 300 may provide IP transport addresses for media reception and transmission on the packet switch side of the handover gateway 300. Interfacing with the circuit switch network 200, the handover gateway 300 may have circuit connections or links to one or more MSCs. Before allowing a successful handover, the handover gateway 300 may ensure the identity of the subscriber terminal device and/or network entity is authenticated. In some cases, the handover gateway 300 may check with the service level agreements (SLA) to allow or disallow a certain handover request. The authentication function may be performed as part of the admission control function in the gateway control unit 320.
  • SLA service level agreements
  • the handover gateway 300 may also provide transmission and load information to the network management system for administrative purposes. User data may be collected for recording and charging purposes. This information may be reported to the charging/billing network entities. Privacy and security of both signaling and media may be provided according to the adopted standards in the handover gateway 300.
  • the handover gateway 300 may report to other network entities in case of certain signaling or media needs to be interceptible to meet restrictions enforced by the federal/legal laws.
  • the present invention provides a way for carriers to deploy IP based mobile networks incrementally while allowing users to have full mobility even during connections. It further allows a separate control plane from the user plane thus satisfying the requirements for IP based cellular networks.
  • the handover gateway may be implemented as a separate network element or integrated with existing network elements.
  • the user plane part of the handover gateway may be implemented together with a roaming signaling gateway (R-SGW). If the handover gateway is used to support handoff to ANSI-41 networks, then the user plane part of the handover gateway may have trunk connections with the target ANSI-41 mobile switching centers.
  • R-SGW roaming signaling gateway

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un dispositif de communication qui permet d'assurer le transfert d'une session active entre un réseau à commutation de paquets et un réseau à commutation de circuits. L'appel ou la session peut être établi entre un dispositif de communication mobile et un équipement terminal. La passerelle de transfert de l'invention permet le transfert de la session active.
EP01928629A 2000-04-25 2001-04-19 Procede et passerelle permettant d'assurer le transfert des appels de communication sans fil Withdrawn EP1277318A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US19936800P 2000-04-25 2000-04-25
US199368P 2000-04-25
US66338300A 2000-09-15 2000-09-15
US663383 2000-09-15
PCT/US2001/012653 WO2001082551A2 (fr) 2000-04-25 2001-04-19 Procede et passerelle permettant d'assurer le transfert des appels de communication sans fil

Publications (1)

Publication Number Publication Date
EP1277318A2 true EP1277318A2 (fr) 2003-01-22

Family

ID=26894693

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01928629A Withdrawn EP1277318A2 (fr) 2000-04-25 2001-04-19 Procede et passerelle permettant d'assurer le transfert des appels de communication sans fil

Country Status (3)

Country Link
EP (1) EP1277318A2 (fr)
AU (1) AU2001255464A1 (fr)
WO (1) WO2001082551A2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8437368B2 (en) 2003-06-04 2013-05-07 Nokia Corporation System and method for handing over a call from a packet-switched network to a circuit-switched network
DE102004004048A1 (de) 2004-01-27 2005-08-18 Siemens Ag Kommunikationssystem, Verfahren zum Anmelden einer Kommunikationsbeziehung und Netzwerkverbindungs-Rechner
FR2871015A1 (fr) * 2004-06-01 2005-12-02 France Telecom Procede de commutation entre deux services de telephonie
EP1827034B1 (fr) 2004-12-17 2009-03-11 Huawei Technologies Co., Ltd. Procede et systeme pour maintenir la continuite d'une session
CN1881958B (zh) 2005-08-08 2011-12-07 华为技术有限公司 一种用户设备从分组域向电路域切换的方法及装置
EP2667661B1 (fr) 2006-06-20 2017-05-03 InterDigital Technology Corporation Faciliter le transfert intercellulaire dans un système LTE
FR2911468A1 (fr) * 2007-01-15 2008-07-18 France Telecom Procede et dispositif de communication
KR101392099B1 (ko) 2007-05-21 2014-05-08 삼성전자주식회사 패킷 네트워크 시스템과 회선 네트워크 시스템간의 호를 핸드오버하는 장치 및 방법
US8681737B2 (en) 2007-09-21 2014-03-25 Motorola Mobility Llc Method and apparatus for inter-technology handoff between a packet data network and a circuit switched network
US8483175B2 (en) * 2007-09-14 2013-07-09 Motorola Mobility Llc Method and apparatus for inter-technology handoff of a user equipment
CN101883343B (zh) * 2009-05-05 2011-09-21 华为终端有限公司 会话转移方法和用户设备

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729544A (en) * 1994-05-09 1998-03-17 Motorola, Inc. Method for transmitting data packets based on message type
DE19834975A1 (de) * 1998-08-03 2000-02-17 Siemens Ag Verfahren zum Umschalten einer ersten auf eine zweite Kommunikationsverbindung, die jeweils zwischen einem ersten und einem zweiten Kommunikationssystem bestehen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0182551A3 *

Also Published As

Publication number Publication date
WO2001082551A3 (fr) 2002-03-14
WO2001082551A2 (fr) 2001-11-01
AU2001255464A1 (en) 2001-11-07

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