US20110069679A1 - Mobile communication system, node apparatus, and inter-network handover control method - Google Patents
Mobile communication system, node apparatus, and inter-network handover control method Download PDFInfo
- Publication number
- US20110069679A1 US20110069679A1 US12/992,636 US99263609A US2011069679A1 US 20110069679 A1 US20110069679 A1 US 20110069679A1 US 99263609 A US99263609 A US 99263609A US 2011069679 A1 US2011069679 A1 US 2011069679A1
- Authority
- US
- United States
- Prior art keywords
- network
- node
- handover
- circuit switched
- gateway node
- 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.)
- Abandoned
Links
- 238000010295 mobile communication Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 26
- 238000010586 diagram Methods 0.000 description 8
- 102000018059 CS domains Human genes 0.000 description 5
- 108050007176 CS domains Proteins 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/12—Reselecting a serving backbone network switching or routing node
-
- 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]
- H04W36/00226—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] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/13—Cell handover without a predetermined boundary, e.g. virtual cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/08—Upper layer protocols
- H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/11—Allocation or use of connection identifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/02—Inter-networking arrangements
Definitions
- This invention relates to a mobile communication system adapted to perform handover control of a mobile terminal between a circuit switched network and a wireless broadband network and further relates to a node apparatus and an inter-network handover control method that are suitable for the mobile communication system.
- VCC Voice Call Continuity
- IMS Internet Protocol Multimedia Subsystem
- FIG. 1 is a diagram for explaining the general end-to-end call control scenario of transfer between access domains defined in Non-Patent Document 1 and so on.
- a mobile terminal B can access a cellular mobile network through cellular wireless communication [3GPP-CS (Circuit Switched)].
- the mobile terminal B can also access an IMS network through, for example, an in-house wireless LAN (Local Area Network).
- step S 101 -CS when a mobile terminal B on the incoming side moves from an IMS domain to a CS domain, i.e. performing handover, the mobile terminal B starts call setup in the CS domain (step S 101 -CS). That is, the mobile terminal B sends a SETUP message (call setup message in the CS phone network) to an MSC (Mobile Services Switching Center) 100 .
- MSC Mobile Services Switching Center
- the SETUP message is transferred to a CSCF (Call Server Control Function) 103 through a MGCF (Media Gateway Control Function)/MGW (Media Gateway) 101 (steps S 102 and S 103 ) and further transferred from the CSCF 103 to the VCC-AS 104 (step S 104 ).
- CSCF Call Server Control Function
- MGCF Media Gateway Control Function
- MGW Media Gateway
- the VCC-AS 104 sends a SIP UPDATE (session update) message for starting to change call connection or a Re-INVITE (request to establish a re-session) message to the CSCF 103 (step S 105 ).
- SIP UPDATE session update
- Re-INVITE request to establish a re-session
- MGW IP Internet Protocol
- new SDP Session Description Protocol
- the SIP UPDATE message or the Re-INVITE message is transferred from the CSCF 103 to a CSCF 105 in a partner-side IMS domain (step S 106 ) and finally transferred to a mobile terminal A being a communication partner (step S 107 ).
- the mobile terminal A changes a voice packet transfer destination IP address to the transferred MGW IP address.
- a voice packet transfer path (voice bearer) is switched on an end-to-end basis.
- step S 101 -IMS when a mobile terminal B moves from a CS domain to an IMS domain, i.e. performing handover, the mobile terminal B starts call setup in the IMS domain (step S 101 -IMS). That is, the mobile terminal B sends a SIP INVITE (request to establish a session) message to a CSCF 103 .
- This SIP INVITE message is transferred to a VCC-AS 104 from the CSCF 103 (step S 104 ).
- the VCC-AS 104 sends a SIP UPDATE (session update) message for starting to change call connection or a Re-INVITE (request to establish a re-session) message to the CSCF 103 (step S 105 ).
- an IP address of the mobile terminal B indicating a node of a new call connection path and new SDP information are transmitted to the CSCF 103 .
- the SIP UPDATE message or the Re-INVITE message is transferred from the CSCF 103 to a CSCF 105 in a partner-side IMS domain (step S 106 ) and finally transferred to a mobile terminal A being a communication partner (step S 107 ).
- the mobile terminal A changes a voice packet transfer destination IP address to the transferred IP address of the mobile terminal B.
- a voice packet transfer path (voice bearer) is switched on an end-to-end basis.
- the VCC-AS is also expected to be used in the same manner as in the above when continuing a voice service between the CS domain and a predetermined wireless broadband [e.g. LTE (Long Term Evolution) access or Non-3GPP access].
- a predetermined wireless broadband e.g. LTE (Long Term Evolution) access or Non-3GPP access.
- Non-Patent Document 1 3GPP TS23.206 V7.5.0 “Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (IMS)”
- VCC Voice Call Continuity
- CS Circuit Switched
- IMS IP Multimedia Subsystem
- the communication processing between the CSCF and the VCC-AS includes, for example, as described above, transfer processing of a call setup message from the CSCF to the VCC-AS and transfer processing of a session update message or a re-session establishing request message from the VCC-AS to the CSCF. That is, much time is required for the transfer processing of these messages. Further, much time is also required for processing in the VCC-AS. Consequently, when the VCC-AS is used, there arises a problem in that the handover processing time increases.
- This invention seeks to provide a mobile communication system that can realize handover between different access networks without providing a VCC-AS and that can shorten the handover processing time.
- This invention further seeks to provide a node apparatus suitable for the above mobile communication system.
- This invention still further seeks to provide an inter-network handover control method suitable for the above mobile communication system.
- a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network, and a node apparatus.
- the node apparatus integrates, into one physical node, a first gateway node interconnecting the circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating the wireless broadband network and an external packet data network through the IP network.
- the mobile terminal when the mobile terminal performs handover from one of the circuit switched network and the wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of the first gateway node and the second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of the handover-destination gateway node.
- a node apparatus provided in a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network.
- the node apparatus integrates, into one physical node, a first gateway node interconnecting the circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating the wireless broadband network and an external packet data network through the IP network.
- this node apparatus when the mobile terminal performs handover from one of the circuit switched network and the wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of the first gateway node and the second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of the handover-destination gateway node.
- an inter-network handover control method in a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network.
- a first gateway node interconnecting the circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating the wireless broadband network and an external packet data network through the IP network are integrated into one physical node.
- this inter-network handover control method when the mobile terminal performs handover from one of the circuit switched network and the wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of the first gateway node and the second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of the handover-destination gateway node.
- FIG. 1 is a diagram for explaining the general end-to-end call control scenario of transfer between access domains
- FIG. 2 is a block diagram showing the configuration of a mobile communication system according to an embodiment of this invention.
- FIG. 3 is a diagram for explaining path setup of C- and U-planes when a voice call is performed through 3G-CS and path setup of C- and U-planes when a voice call is performed through LTE, in the mobile communication system shown in FIG. 2 ;
- FIG. 4 is a sequence diagram for explaining the operation at the time of handover from the 3G-CS to the LTE in the mobile communication system shown in FIG. 2 ;
- FIG. 5 is a sequence diagram for explaining the operation at the time of handover from the LTE to the 3G-CS in the mobile communication system shown in FIG. 2 .
- FIG. 2 is a block diagram showing the configuration of a mobile communication system 10 according to an embodiment of this invention.
- the mobile communication system 10 includes at least one UE (User Equipment) (mobile terminal) 20 , as a so-called dual terminal, having a function of accessing a CS (Circuit Switched) network and a function of accessing a wireless broadband network.
- the mobile communication system 10 further includes a 3G (3rd Generation)-CS network 30 as one example of the CS network and an EPC (Evolved Packet Core) network 40 as one example of the wireless broadband network.
- 3G 3rd Generation
- EPC Evolved Packet Core
- the 3G-CS network 30 includes an MSC (Mobile Services Switching Center) 32 , an RNC (Radio Network Controller) 34 , and an NB (Node B) (radio base station) 36 .
- the MSC 32 is a core network node that handles circuit switched calls (mainly voice calls).
- the RNC 34 is an access network node that controls the radio base station 36 .
- the NB 36 is a radio base station apparatus that performs communication with the UE 20 .
- the EPC network 40 accommodates, for example, the LTE (Long Term Evolution) access.
- the EPC network 40 includes a P-GW (Packet Data Network Gateway) 42 as a second gateway node, an S-GW (Serving Gateway) 44 , an MME (Mobility Management Entity) 46 , and an eNB (evolved Node B) 48 .
- the P-GW 42 as the second gateway node has a function of interconnecting the EPC network 40 and an external PDN (Packet Data Network).
- call connection path node identification information IP address
- the P-GW 42 performs allocation of an IP address to each UE 20 and management thereof.
- the S-GW 44 is a node accommodating U-plane of 3G-PS and LTE.
- the U-plane represents a function (or protocol) of transferring “user information” being main information of communication.
- the MME 46 is a node that performs LTE mobility management.
- the eNB 48 is a radio base station apparatus that performs communication with the UE 20 .
- the 3G-CS network 30 and the EPC network 40 are connected to an IMS (IP Multimedia Subsystem) 50 .
- the IMS 50 is a system that provides an IP-based multimedia service to a mobile terminal without depending on an access network.
- the IMS 50 includes an MGW (Media Gateway) 52 and an MGCF (Media Gateway Control Function) 54 as a first gateway node and a CSCF (Call Server Control Function) 56 .
- the MGW 52 is provided in a U-plane and performs media conversion (e.g. Codec conversion of voice information), QoS (Quality of Service) control, and so on.
- the MGCF 54 is a node that performs protocol conversion between an SIP (Session Initiation Protocol) and an ISUP (ISDN User Part: protocol for sending information such as one's own telephone number and destination telephone number when setting up a telephone call using ISDN, or the like) in a C-plane.
- SIP Session Initiation Protocol
- ISUP ISDN User Part
- the C-plane represents a function (or protocol) of transferring “control information” for connection (call connection), disconnection, or the like between a mobile terminal and a circuit.
- the CSCF 56 is a node that performs call control (user registration and session setup) according to the SIP in the IMS 50 .
- a PSTN (Public Switched Telephone Network)/VoIP (Voice over Internet Protocol) network 60 is a network located between the IMS 50 and a voice call partner.
- PSTN Public Switched Telephone Network
- VoIP Voice over Internet Protocol
- call connection path node identification information seen from a communication partner (partner-side UE connected through the PSTN/VoIP network 60 ) is an IP address used by the MGCF 54 and the MGW 52 accommodating the UE 20 . At least one of the MGCF 54 and the MGW 52 manages this IP address.
- a description will be given assuming that the MGCF 54 manages this IP address.
- a node apparatus 70 integrates the MGW 52 /MGCF 54 as the first gateway node and the P-GW 42 as the second gateway node, which have never cooperated with each other before, into one physical node.
- “integrates - - - into one physical node” means incorporating the first gateway node (MGW 52 and MGCF 54 ) and the second gateway node (P-GW 42 ) into a single apparatus.
- the MGCF 54 can acquire call connection path node identification information in the EPC network 40 (e.g. IP address of the UE 20 ), which is the information managed by the P-GW 42 .
- the P-GW 42 can acquire call connection path node identification information in the 3G-CS network 30 (e.g. IP address used by the MGW 52 and the MGCF 54 ), which is the information managed by the MGCF 54 .
- the P-GW 42 allocates an IP address used by the MGW 52 and the MGCF 54 when the UE 20 is present in the 3G-CS network 30 , as an IP address to be used by the UE 20 when it is present in the EPC network 40 .
- the MGCF 54 allocates an IP address used by the UE 20 when it is present in the EPC network 40 , as an IP address to be used by the MGW 52 and the MGCF 54 .
- FIG. 3 is a diagram showing path setup of the respective planes when a voice call is performed through the 3G-CS and path setup of the respective planes when a voice call is performed through the LTE, in the mobile communication system 10 shown in FIG. 2 .
- the path for the C-plane is indicated by broken lines while the path for the U-plane is indicated by solid lines.
- a description will be given assuming that the UE 20 present in the 3G-CS is a UE (3G-CS) 20 and the UE 20 present in the LTE is a UE (LTE) 20 .
- the UE (3G-CS) 20 communicates with the MSC 32 according to a CC (Call Control) protocol and the MSC 32 communicates with the MGCF 54 according to the ISUP protocol.
- the MGCF 54 performs protocol conversion between the ISUP and the SIP.
- Communication between the MGCF 54 and the CSCF 56 and communication between the CSCF 56 and the PSTN/VoIP network 60 are each performed according to the SIP protocol.
- a CS bearer is set along a transmission line between the UE (3G-CS) 20 and the MGW 52 .
- Communication between the MGW 52 and the PSTN/VoIP network 60 is performed according to an RTP (Real-time Transport Protocol)/IP.
- RTP Real-time Transport Protocol
- IP address in the case of performing a voice call through the 3G-CS is terminated at the MGCF 54 /MGW 52 and hereinafter this IP address will be given as an IPA (3G-CS).
- the UE (LTE) 20 performs communication with the P-GW 42 according to the SIP protocol on a Default bearer (U-plane path for sending/receiving a SIP message) set in access switching of the UE (LTE) 20 to the LTE.
- Communication between the P-GW 42 and the CSCF 56 and communication between the CSCF 56 and the PSTN/VoIP network 60 are each performed according to the SIP protocol.
- communication is performed between the UE (LTE) 20 and the PSTN/VoIP network 60 according to the RTP/IP.
- an IP address in the case of performing a voice call through the LTE is terminated at the UE (LTE) 20 and hereinafter this IP address will be given as an IPA (LTE).
- FIG. 4 shows the sequence for explaining the operation of the mobile communication system 10 at the time of handover from the 3G-CS to the LTE.
- a CS bearer between the UE (3G-CS) 20 and the MGW 52 and is communicated on an IP bearer between the MGW 52 and the PSTN/VoIP network 60 (step S 1 ).
- the UE 20 performs handover from the 3G-CS to the LTE due to, for example, degradation of the radio conditions (step S 2 ).
- the UE 20 having performed handover from the 3G-CS to the LTE will be called the UE (LTE) 20 .
- the UE (LTE) 20 performs access switching to the LTE with respect to the P-GW 42 (step S 3 ).
- the P-GW 42 allocates an IP address to the UE (LTE) 20 . How to allocate the IP address will be described in detail hereinbelow.
- the node apparatus 70 integrates the MGW 52 /MGCF 54 and the P-GW 42 into one physical node.
- the P-GW 42 can acquire an IP address IPA (3G-CS) used by the MGW 52 and the MGCF 54 in U-plane and C-plane communications, respectively.
- the P-GW 42 allocates this acquired IP address IPA (3G-CS) as an IP address IPA (LTE) to be used by the UE (LTE) 20 on the LTE side.
- the P-GW 42 sets a Default bearer, serving as a U-plane path for sending/receiving a SIP message, between the UE (LTE) 20 and the P-GW 42 .
- the UE (LTE) 20 uses the IP address IPA (LTE) allocated from the P-GW 42 and sends a SIP INVITE (request to establish a session) message to the CSCF 56 (step S 5 ).
- the CSCF 56 sends this SIP INVITE message to the PSTN/VoIP network 60 where the communication partner is present (step S 6 ).
- the CSCF 56 After negotiations between the UE (LTE) 20 and the communication partner for a voice codec according to the SIP protocol, QoS, and so on, the CSCF 56 receives a SIP 200 OK message from the PSTN/VoIP network 60 (step S 7 ). By sending of the SIP 200 OK message from the CSCF 56 to the UE (LTE) 20 (step S 8 ), a voice path (Dedicated Bearer) is set between the UE (LTE) 20 and the P-GW 42 (step S 9 ). By this, an IP bearer is established between the UE (LTE) 20 and the PSTN/VoIP network 60 so that the handover sequence is completed (step S 10 ). That is, a voice service continues between the 3G-CS and the LTE.
- a voice path Dedicated Bearer
- FIG. 5 shows the sequence for explaining the operation of the mobile communication system 10 at the time of handover from the LTE to the 3G-CS.
- the UE (LTE) 20 When the UE (LTE) 20 performs a voice call with a communication partner (partner-side UE connected through the PSTN/VoIP network 60 ), user information is communicated on an IP bearer between the UE (LTE) 20 and the PSTN/VoIP network 60 (step S 21 ).
- the UE 20 performs handover from the LTE to the 3G-CS due to, for example, degradation of the radio conditions (step S 22 ).
- the UE 20 having performed handover from the LTE to the 3G-CS will be called the UE (3G-CS) 20 .
- the UE (3G-CS) 20 performs access switching to the 3G-CS with respect to the MSC 32 (step S 23 ). Since this access switching itself is known, an explanation thereof is omitted.
- the UE (3G-CS) 20 sends a CC SETUP (call setup) message to the MSC 32 for setting a voice path (step S 24 ).
- the MSC 32 sends an ISUP IAM (Initial Address Message) to the MGCF 54 (step S 25 ).
- the ISUP IAM includes information such as dial numeral information.
- the node apparatus 70 integrates the MGW 52 /MGCF 54 and the P-GW 42 into one physical node.
- the MGW 52 /MGCF 54 and the P-GW 42 can acquire an IP address IPA (LTE) used by the UE (LTE) 20 when it is present in the LTE.
- the MGCF 54 allocates this IP address IPA (LTE) as an IP address IPA (3G-CS) to be used by the MGW 52 and the MGCF 54 in U-plane and C-plane communications, respectively, in the IMS 50 (step S 26 ).
- the MGCF 54 uses this allocated IP address IPA (3G-CS) and sends a SIP INVITE (request to establish a session) message to the CSCF 56 (step S 27 ).
- the CSCF 56 sends this SIP INVITE message to the PSTN/VoIP network 60 where the communication partner is present (step S 28 ).
- the CSCF 56 receives a SIP 200 OK message from the PSTN/VoIP network 60 (step S 29 ).
- the CSCF 56 sends this SIP 200 OK message to the MGCF 54 (step S 30 ).
- the MGCF 54 performs protocol conversion between the SIP and the ISUP and sends an ISUP ANM (Answer Message) to the MSC 32 (step S 31 ).
- a voice path (CS bearer) is set between the UE (3G-CS) 20 and the MGW 52 . That is, the CS bearer is established between the UE (3G-CS) 20 and the MGW 52 and an IP bearer is established between the MGW 52 and the PSTN/VoIP network 60 so that the handover sequence is completed (step S 33 ). Therefore, a voice service continues between the 3G-CS and the LTE.
- the node apparatus 70 integrates the MGW 52 /MGCF 54 as the first gateway node and the P-GW 42 as the second gateway node, which have never cooperated with each other before, into one physical node.
- the MGW 52 /MGCF 54 and the P-GW 42 into one physical node, IP addresses that both nodes have separately managed before can be shared between them.
- the MGCF 54 can acquire an IP address IPA (LTE) used by the UE (LTE) 20 when it is present in the LTE, which is the IP address managed by the P-GW 42 .
- the P-GW 42 can acquire an IP address IPA (3G-CS) used by the MGW 52 and the MGCF 54 in U-plane and C-plane communications, respectively, which is the IP address managed by the MGCF 54 .
- the P-GW 42 can allocate the IP address IPA (3G-CS) to the UE 20 .
- the MGCF 54 can allocate the IP address IPA (LTE) to the MGW 52 /MGCF 54 .
- the node apparatus 70 realizes the function equivalent to that required at the VCC-AS at the time of handover. Therefore, with the node apparatus 70 , it is possible to make the VCC-AS unnecessary. Accordingly, it is possible to omit communication processing between the CSCF 56 and the VCC-AS that is otherwise required with the use of the VCC-AS (e.g. transfer processing of a call setup message from the CSCF 56 to the VCC-AS, transfer processing of a session update message or a re-session establishing request message from the VCC-AS to the CSCF 56 , and so on), and processing of the VCC-AS itself. Therefore, the call traffic in the IMS 50 is reduced and, as a result, the handover processing time can be shortened. Further, since the VCC-AS itself becomes unnecessary, it is possible to reduce the apparatus scale and cost of the IMS 50 .
- the LTE access is cited as one example of the wireless broadband network, but the wireless broadband network is not limited only to the LTE access and, for example, can include a Non-3GPP access.
- the Non-3GPP access may be, for example, a WLAN (Wireless LAN), a WiMAX (Worldwide interoperability for Microwave Access), or the like.
- the CS network is not limited to the 3G-CS network and can be a 2G (2nd Generation)-CS network.
Abstract
A mobile communication system includes at least one mobile terminal that can access a circuit switched network and a wireless broadband network, and a node apparatus. The node apparatus integrates, into one physical node, a first gateway node interconnecting the circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating the wireless broadband network and an external packet data network. When the mobile terminal performs handover from one of the circuit switched network and the wireless broadband network to the other network, one of the first gateway node and the second gateway node, being a handover-destination node, allocates call connection path node identification information managed by the other gateway note being a handover-source node, as new call connection path node identification information of the handover-destination node.
Description
- This invention relates to a mobile communication system adapted to perform handover control of a mobile terminal between a circuit switched network and a wireless broadband network and further relates to a node apparatus and an inter-network handover control method that are suitable for the mobile communication system.
- In the 3GPP (3rd Generation Partnership Project), there have been discussions about methods for continuing a voice service between different access networks. VCC (Voice Call Continuity) can be cited as one example of them (see Non-Patent Document 1). The VCC is, specifically, realized by using a VCC-AS (Application Server) provided in an IMS (Internet Protocol Multimedia Subsystem).
-
FIG. 1 is a diagram for explaining the general end-to-end call control scenario of transfer between access domains defined inNon-Patent Document 1 and so on. A mobile terminal B can access a cellular mobile network through cellular wireless communication [3GPP-CS (Circuit Switched)]. The mobile terminal B can also access an IMS network through, for example, an in-house wireless LAN (Local Area Network). - In
FIG. 1 , for example, when a mobile terminal B on the incoming side moves from an IMS domain to a CS domain, i.e. performing handover, the mobile terminal B starts call setup in the CS domain (step S101-CS). That is, the mobile terminal B sends a SETUP message (call setup message in the CS phone network) to an MSC (Mobile Services Switching Center) 100. For anchoring this call control at a VCC-AS 104, the SETUP message is transferred to a CSCF (Call Server Control Function) 103 through a MGCF (Media Gateway Control Function)/MGW (Media Gateway) 101 (steps S102 and S103) and further transferred from theCSCF 103 to the VCC-AS 104 (step S104). - Then, the VCC-AS 104 sends a SIP UPDATE (session update) message for starting to change call connection or a Re-INVITE (request to establish a re-session) message to the CSCF 103 (step S105). By this message, an MGW IP (Internet Protocol) address indicating a new call connection path and new SDP (Session Description Protocol) information are transmitted to the CSCF 103 from the VCC-AS 104. The SIP UPDATE message or the Re-INVITE message is transferred from the
CSCF 103 to aCSCF 105 in a partner-side IMS domain (step S106) and finally transferred to a mobile terminal A being a communication partner (step S107). The mobile terminal A changes a voice packet transfer destination IP address to the transferred MGW IP address. By this, a voice packet transfer path (voice bearer) is switched on an end-to-end basis. - On the other hand, in
FIG. 1 , when a mobile terminal B moves from a CS domain to an IMS domain, i.e. performing handover, the mobile terminal B starts call setup in the IMS domain (step S101-IMS). That is, the mobile terminal B sends a SIP INVITE (request to establish a session) message to aCSCF 103. This SIP INVITE message is transferred to a VCC-AS 104 from the CSCF 103 (step S104). The VCC-AS 104 sends a SIP UPDATE (session update) message for starting to change call connection or a Re-INVITE (request to establish a re-session) message to the CSCF 103 (step S105). By this message, an IP address of the mobile terminal B indicating a node of a new call connection path and new SDP information are transmitted to the CSCF 103. The SIP UPDATE message or the Re-INVITE message is transferred from theCSCF 103 to aCSCF 105 in a partner-side IMS domain (step S106) and finally transferred to a mobile terminal A being a communication partner (step S107). The mobile terminal A changes a voice packet transfer destination IP address to the transferred IP address of the mobile terminal B. By this, a voice packet transfer path (voice bearer) is switched on an end-to-end basis. - While the above is the scenario of voice service continuity following the mobile terminal handover between the IMS domain and the CS domain, the VCC-AS is also expected to be used in the same manner as in the above when continuing a voice service between the CS domain and a predetermined wireless broadband [e.g. LTE (Long Term Evolution) access or Non-3GPP access].
- Non-Patent Document 1: 3GPP TS23.206 V7.5.0 “Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (IMS)”
- However, when continuing a voice service between different access networks using a VCC-AS, communication processing is required between a CSCF and the VCC-AS in an IMS. The communication processing between the CSCF and the VCC-AS includes, for example, as described above, transfer processing of a call setup message from the CSCF to the VCC-AS and transfer processing of a session update message or a re-session establishing request message from the VCC-AS to the CSCF. That is, much time is required for the transfer processing of these messages. Further, much time is also required for processing in the VCC-AS. Consequently, when the VCC-AS is used, there arises a problem in that the handover processing time increases.
- This invention seeks to provide a mobile communication system that can realize handover between different access networks without providing a VCC-AS and that can shorten the handover processing time.
- This invention further seeks to provide a node apparatus suitable for the above mobile communication system.
- This invention still further seeks to provide an inter-network handover control method suitable for the above mobile communication system.
- According to a first aspect of this invention, there is provided a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network, and a node apparatus. The node apparatus integrates, into one physical node, a first gateway node interconnecting the circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating the wireless broadband network and an external packet data network through the IP network. In this mobile communication system, when the mobile terminal performs handover from one of the circuit switched network and the wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of the first gateway node and the second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of the handover-destination gateway node.
- According to a second aspect of this invention, there is provided a node apparatus provided in a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network. The node apparatus integrates, into one physical node, a first gateway node interconnecting the circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating the wireless broadband network and an external packet data network through the IP network. In this node apparatus, when the mobile terminal performs handover from one of the circuit switched network and the wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of the first gateway node and the second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of the handover-destination gateway node.
- According to a third aspect of this invention, there is provided an inter-network handover control method in a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network. In this inter-network handover control method, a first gateway node interconnecting the circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating the wireless broadband network and an external packet data network through the IP network are integrated into one physical node. Further, in this inter-network handover control method, when the mobile terminal performs handover from one of the circuit switched network and the wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of the first gateway node and the second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of the handover-destination gateway node.
- According to this invention, it becomes possible to realize handover between different access networks without providing a VCC-AS and to shorten the handover processing time.
-
FIG. 1 is a diagram for explaining the general end-to-end call control scenario of transfer between access domains; -
FIG. 2 is a block diagram showing the configuration of a mobile communication system according to an embodiment of this invention; -
FIG. 3 is a diagram for explaining path setup of C- and U-planes when a voice call is performed through 3G-CS and path setup of C- and U-planes when a voice call is performed through LTE, in the mobile communication system shown inFIG. 2 ; -
FIG. 4 is a sequence diagram for explaining the operation at the time of handover from the 3G-CS to the LTE in the mobile communication system shown inFIG. 2 ; and -
FIG. 5 is a sequence diagram for explaining the operation at the time of handover from the LTE to the 3G-CS in the mobile communication system shown inFIG. 2 . -
FIG. 2 is a block diagram showing the configuration of amobile communication system 10 according to an embodiment of this invention. Themobile communication system 10 includes at least one UE (User Equipment) (mobile terminal) 20, as a so-called dual terminal, having a function of accessing a CS (Circuit Switched) network and a function of accessing a wireless broadband network. Themobile communication system 10 further includes a 3G (3rd Generation)-CS network 30 as one example of the CS network and an EPC (Evolved Packet Core)network 40 as one example of the wireless broadband network. - The 3G-
CS network 30 includes an MSC (Mobile Services Switching Center) 32, an RNC (Radio Network Controller) 34, and an NB (Node B) (radio base station) 36. The MSC 32 is a core network node that handles circuit switched calls (mainly voice calls). The RNC 34 is an access network node that controls theradio base station 36. The NB 36 is a radio base station apparatus that performs communication with the UE 20. - The
EPC network 40 accommodates, for example, the LTE (Long Term Evolution) access. TheEPC network 40 includes a P-GW (Packet Data Network Gateway) 42 as a second gateway node, an S-GW (Serving Gateway) 44, an MME (Mobility Management Entity) 46, and an eNB (evolvedNode B) 48. The P-GW 42 as the second gateway node has a function of interconnecting theEPC network 40 and an external PDN (Packet Data Network). Herein, in the case of theEPC network 40, call connection path node identification information (IP address) is set per UE 20. The P-GW 42 performs allocation of an IP address to each UE 20 and management thereof. The S-GW 44 is a node accommodating U-plane of 3G-PS and LTE. The U-plane represents a function (or protocol) of transferring “user information” being main information of communication. TheMME 46 is a node that performs LTE mobility management. TheeNB 48 is a radio base station apparatus that performs communication with theUE 20. - The 3G-
CS network 30 and theEPC network 40 are connected to an IMS (IP Multimedia Subsystem) 50. TheIMS 50 is a system that provides an IP-based multimedia service to a mobile terminal without depending on an access network. - The
IMS 50 includes an MGW (Media Gateway) 52 and an MGCF (Media Gateway Control Function) 54 as a first gateway node and a CSCF (Call Server Control Function) 56. TheMGW 52 is provided in a U-plane and performs media conversion (e.g. Codec conversion of voice information), QoS (Quality of Service) control, and so on. TheMGCF 54 is a node that performs protocol conversion between an SIP (Session Initiation Protocol) and an ISUP (ISDN User Part: protocol for sending information such as one's own telephone number and destination telephone number when setting up a telephone call using ISDN, or the like) in a C-plane. The C-plane represents a function (or protocol) of transferring “control information” for connection (call connection), disconnection, or the like between a mobile terminal and a circuit. TheCSCF 56 is a node that performs call control (user registration and session setup) according to the SIP in theIMS 50. - A PSTN (Public Switched Telephone Network)/VoIP (Voice over Internet Protocol)
network 60 is a network located between theIMS 50 and a voice call partner. - Herein, in the case of the 3G-
CS network 30, theUE 20 does not have an individual IP address. Therefore, call connection path node identification information (IP address) seen from a communication partner (partner-side UE connected through the PSTN/VoIP network 60) is an IP address used by the MGCF 54 and theMGW 52 accommodating theUE 20. At least one of theMGCF 54 and theMGW 52 manages this IP address. Hereinbelow, a description will be given assuming that theMGCF 54 manages this IP address. - A node apparatus 70 (
FIG. 3 ) integrates theMGW 52/MGCF 54 as the first gateway node and the P-GW 42 as the second gateway node, which have never cooperated with each other before, into one physical node. Herein, “integrates - - - into one physical node” means incorporating the first gateway node (MGW 52 and MGCF 54) and the second gateway node (P-GW 42) into a single apparatus. By integrating theMGW 52/MGCF 54 and the P-GW 42 into one physical node, information that both nodes have separately managed before can be shared between them. - Specifically, the
MGCF 54 can acquire call connection path node identification information in the EPC network 40 (e.g. IP address of the UE 20), which is the information managed by the P-GW 42. On the other hand, the P-GW 42 can acquire call connection path node identification information in the 3G-CS network 30 (e.g. IP address used by theMGW 52 and the MGCF 54), which is the information managed by theMGCF 54. - That is, at the time of handover from the 3G-
CS network 30 to theEPC network 40, the P-GW 42 allocates an IP address used by theMGW 52 and theMGCF 54 when theUE 20 is present in the 3G-CS network 30, as an IP address to be used by theUE 20 when it is present in theEPC network 40. On the other hand, at the time of handover from theEPC network 40 to the 3G-CS network 30, theMGCF 54 allocates an IP address used by theUE 20 when it is present in theEPC network 40, as an IP address to be used by theMGW 52 and theMGCF 54. -
FIG. 3 is a diagram showing path setup of the respective planes when a voice call is performed through the 3G-CS and path setup of the respective planes when a voice call is performed through the LTE, in themobile communication system 10 shown inFIG. 2 . InFIG. 3 , the path for the C-plane is indicated by broken lines while the path for the U-plane is indicated by solid lines. Hereinbelow, a description will be given assuming that theUE 20 present in the 3G-CS is a UE (3G-CS) 20 and theUE 20 present in the LTE is a UE (LTE) 20. - A description will be given in the case of performing a voice call through the 3G-CS. With respect to the C-plane, the UE (3G-CS) 20 communicates with the
MSC 32 according to a CC (Call Control) protocol and theMSC 32 communicates with theMGCF 54 according to the ISUP protocol. TheMGCF 54 performs protocol conversion between the ISUP and the SIP. Communication between the MGCF 54 and theCSCF 56 and communication between theCSCF 56 and the PSTN/VoIP network 60 are each performed according to the SIP protocol. With respect to the U-plane, a CS bearer is set along a transmission line between the UE (3G-CS) 20 and theMGW 52. Communication between theMGW 52 and the PSTN/VoIP network 60 is performed according to an RTP (Real-time Transport Protocol)/IP. Herein, an IP address in the case of performing a voice call through the 3G-CS is terminated at theMGCF 54/MGW 52 and hereinafter this IP address will be given as an IPA (3G-CS). - A description will be given in the case of performing a voice call through the LTE. With respect to the C-plane, the UE (LTE) 20 performs communication with the P-
GW 42 according to the SIP protocol on a Default bearer (U-plane path for sending/receiving a SIP message) set in access switching of the UE (LTE) 20 to the LTE. Communication between the P-GW 42 and theCSCF 56 and communication between theCSCF 56 and the PSTN/VoIP network 60 are each performed according to the SIP protocol. With respect to the U-plane, communication is performed between the UE (LTE) 20 and the PSTN/VoIP network 60 according to the RTP/IP. Herein, an IP address in the case of performing a voice call through the LTE is terminated at the UE (LTE) 20 and hereinafter this IP address will be given as an IPA (LTE). -
FIG. 4 shows the sequence for explaining the operation of themobile communication system 10 at the time of handover from the 3G-CS to the LTE. - When the UE (3G-CS) 20 performs a voice call with a communication partner (partner-side UE connected through the PSTN/VoIP network 60), user information is communicated on a CS bearer between the UE (3G-CS) 20 and the
MGW 52 and is communicated on an IP bearer between theMGW 52 and the PSTN/VoIP network 60 (step S1). - The
UE 20 performs handover from the 3G-CS to the LTE due to, for example, degradation of the radio conditions (step S2). Hereinbelow, theUE 20 having performed handover from the 3G-CS to the LTE will be called the UE (LTE) 20. The UE (LTE) 20 performs access switching to the LTE with respect to the P-GW 42 (step S3). - In this access switching, firstly, the P-
GW 42 allocates an IP address to the UE (LTE) 20. How to allocate the IP address will be described in detail hereinbelow. - As described before, the
node apparatus 70 integrates theMGW 52/MGCF 54 and the P-GW 42 into one physical node. By integrating theMGW 52/MGCF 54 and the P-GW 42 into one physical node, IP address information that both nodes have separately managed before can be shared between them. Therefore, the P-GW 42 can acquire an IP address IPA (3G-CS) used by theMGW 52 and theMGCF 54 in U-plane and C-plane communications, respectively. The P-GW 42 allocates this acquired IP address IPA (3G-CS) as an IP address IPA (LTE) to be used by the UE (LTE) 20 on the LTE side. - In the access switching, secondly, the P-
GW 42 sets a Default bearer, serving as a U-plane path for sending/receiving a SIP message, between the UE (LTE) 20 and the P-GW 42. The UE (LTE) 20 uses the IP address IPA (LTE) allocated from the P-GW 42 and sends a SIP INVITE (request to establish a session) message to the CSCF 56 (step S5). TheCSCF 56 sends this SIP INVITE message to the PSTN/VoIP network 60 where the communication partner is present (step S6). - After negotiations between the UE (LTE) 20 and the communication partner for a voice codec according to the SIP protocol, QoS, and so on, the
CSCF 56 receives aSIP 200 OK message from the PSTN/VoIP network 60 (step S7). By sending of theSIP 200 OK message from theCSCF 56 to the UE (LTE) 20 (step S8), a voice path (Dedicated Bearer) is set between the UE (LTE) 20 and the P-GW 42 (step S9). By this, an IP bearer is established between the UE (LTE) 20 and the PSTN/VoIP network 60 so that the handover sequence is completed (step S10). That is, a voice service continues between the 3G-CS and the LTE. -
FIG. 5 shows the sequence for explaining the operation of themobile communication system 10 at the time of handover from the LTE to the 3G-CS. - When the UE (LTE) 20 performs a voice call with a communication partner (partner-side UE connected through the PSTN/VoIP network 60), user information is communicated on an IP bearer between the UE (LTE) 20 and the PSTN/VoIP network 60 (step S21).
- The
UE 20 performs handover from the LTE to the 3G-CS due to, for example, degradation of the radio conditions (step S22). Hereinbelow, theUE 20 having performed handover from the LTE to the 3G-CS will be called the UE (3G-CS) 20. The UE (3G-CS) 20 performs access switching to the 3G-CS with respect to the MSC 32 (step S23). Since this access switching itself is known, an explanation thereof is omitted. - Then, the UE (3G-CS) 20 sends a CC SETUP (call setup) message to the
MSC 32 for setting a voice path (step S24). TheMSC 32 sends an ISUP IAM (Initial Address Message) to the MGCF 54 (step S25). The ISUP IAM includes information such as dial numeral information. - As described before, the
node apparatus 70 integrates theMGW 52/MGCF 54 and the P-GW 42 into one physical node. By integrating theMGW 52/MGCF 54 and the P-GW 42 into one physical node, IP address information that both nodes have separately managed before can be shared between them. Therefore, theMGCF 54 can acquire an IP address IPA (LTE) used by the UE (LTE) 20 when it is present in the LTE. TheMGCF 54 allocates this IP address IPA (LTE) as an IP address IPA (3G-CS) to be used by theMGW 52 and theMGCF 54 in U-plane and C-plane communications, respectively, in the IMS 50 (step S26). TheMGCF 54 uses this allocated IP address IPA (3G-CS) and sends a SIP INVITE (request to establish a session) message to the CSCF 56 (step S27). - The
CSCF 56 sends this SIP INVITE message to the PSTN/VoIP network 60 where the communication partner is present (step S28). After negotiations between the UE (3G-CS) 20 and the communication partner for a voice codec, QoS, and so on, theCSCF 56 receives aSIP 200 OK message from the PSTN/VoIP network 60 (step S29). TheCSCF 56 sends thisSIP 200 OK message to the MGCF 54 (step S30). TheMGCF 54 performs protocol conversion between the SIP and the ISUP and sends an ISUP ANM (Answer Message) to the MSC 32 (step S31). By sending of a CC CONNECT message from theMSC 32 to the UE (3G-CS) 20 (step S32), a voice path (CS bearer) is set between the UE (3G-CS) 20 and theMGW 52. That is, the CS bearer is established between the UE (3G-CS) 20 and theMGW 52 and an IP bearer is established between theMGW 52 and the PSTN/VoIP network 60 so that the handover sequence is completed (step S33). Therefore, a voice service continues between the 3G-CS and the LTE. - In the
mobile communication system 10 according to the embodiment of this invention described above, thenode apparatus 70 integrates theMGW 52/MGCF 54 as the first gateway node and the P-GW 42 as the second gateway node, which have never cooperated with each other before, into one physical node. By integrating theMGW 52/MGCF 54 and the P-GW 42 into one physical node, IP addresses that both nodes have separately managed before can be shared between them. - Specifically, the
MGCF 54 can acquire an IP address IPA (LTE) used by the UE (LTE) 20 when it is present in the LTE, which is the IP address managed by the P-GW 42. On the other hand, the P-GW 42 can acquire an IP address IPA (3G-CS) used by theMGW 52 and theMGCF 54 in U-plane and C-plane communications, respectively, which is the IP address managed by theMGCF 54. - Accordingly, at the time of handover from the 3G-CS to the LTE, the P-
GW 42 can allocate the IP address IPA (3G-CS) to theUE 20. On the other hand, at the time of handover from the LTE to the 3G-CS, theMGCF 54 can allocate the IP address IPA (LTE) to theMGW 52/MGCF 54. - That is, the
node apparatus 70 realizes the function equivalent to that required at the VCC-AS at the time of handover. Therefore, with thenode apparatus 70, it is possible to make the VCC-AS unnecessary. Accordingly, it is possible to omit communication processing between theCSCF 56 and the VCC-AS that is otherwise required with the use of the VCC-AS (e.g. transfer processing of a call setup message from theCSCF 56 to the VCC-AS, transfer processing of a session update message or a re-session establishing request message from the VCC-AS to theCSCF 56, and so on), and processing of the VCC-AS itself. Therefore, the call traffic in theIMS 50 is reduced and, as a result, the handover processing time can be shortened. Further, since the VCC-AS itself becomes unnecessary, it is possible to reduce the apparatus scale and cost of theIMS 50. - In the above description, the LTE access is cited as one example of the wireless broadband network, but the wireless broadband network is not limited only to the LTE access and, for example, can include a Non-3GPP access. In that case, the Non-3GPP access may be, for example, a WLAN (Wireless LAN), a WiMAX (Worldwide interoperability for Microwave Access), or the like. Further, the CS network is not limited to the 3G-CS network and can be a 2G (2nd Generation)-CS network.
- While this invention has been described in terms of the embodiment, this invention is not limited thereto. The structure and details of this invention can be applied with various changes that can be understood by a person skilled in the art within the sprit and scope of this invention described in the claims.
- This application claims the benefit of priority from Japanese Patent Application No. 2008-145211, filed on Jun. 3, 2008, the disclosure of which is incorporated herein in its entirety by reference.
Claims (20)
1. A mobile communication system comprising:
at least one mobile terminal that can access a circuit switched network and a wireless broadband network; and
a node apparatus integrating, into one physical node, a first gateway node interconnecting said circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating said wireless broadband network and an external packet data network through said IP network,
wherein when said mobile terminal performs handover from one of said circuit switched network and said wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of said first gateway node and said second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of said handover-destination gateway node.
2. The mobile communication system according to claim 1 , wherein when said mobile terminal performs handover from said wireless broadband network to said circuit switched network, said first gateway node allocates the call connection path node identification information in said wireless broadband network, which is the information managed by said second gateway node, as the call connection path node identification information of said circuit switched network.
3. The mobile communication system according to claim 1 , wherein when said mobile terminal performs handover from said circuit switched network to said wireless broadband network, said second gateway node allocates the call connection path node identification information in said circuit switched network, which is the information managed by said first gateway node, as the call connection path node identification information of said wireless broadband network.
4. The mobile communication system according to claim 1 , wherein the call connection path node identification information in said circuit switched network is an IP address of said first gateway node.
5. The mobile communication system according to claim 1 , wherein the call connection path node identification information in said wireless broadband network is an IP address of said mobile terminal.
6. The mobile communication system according to claim 1 , wherein said first gateway node comprises a media gateway node that performs conversion between data of said circuit switched network and data of said IP network when transferring user information, and a media gateway control function node that performs protocol conversion between a session initiation protocol and an ISDN user part when transferring control information.
7-10. (canceled)
11. The mobile communication system according to claim 1 , wherein said circuit switched network is a circuit switched network having a third generation mobile communication network.
12. The mobile communication system according to claim 1 , wherein said circuit switched network is a circuit switched network having a second generation mobile communication network.
13. A node apparatus provided in a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network,
wherein said node apparatus integrates, into one physical node, a first gateway node interconnecting said circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating said wireless broadband network and an external packet data network through said IP network, and
when said mobile terminal performs handover from one of said circuit switched network and said wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of said first gateway node and said second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of said handover-destination gateway node.
14. The node apparatus according to claim 13 , wherein when said mobile terminal performs handover from said wireless broadband network to said circuit switched network, said first gateway node allocates the call connection path node identification information in said wireless broadband network, which is the information managed by said second gateway node, as the call connection path node identification information of said circuit switched network.
15. The node apparatus according to claim 13 , wherein when said mobile terminal performs handover from said circuit switched network to said wireless broadband network, said second gateway node allocates the call connection path node identification information in said circuit switched network, which is the information managed by said first gateway node, as the call connection path node identification information of said wireless broadband network.
16. The node apparatus according to claim 13 , wherein the call connection path node identification information in said circuit switched network is an IP address of said first gateway node.
17. The node apparatus according to claim 13 , wherein the call connection path node identification information in said wireless broadband network is an IP address of said mobile terminal.
18. The node apparatus according to claim 13 , wherein said first gateway node comprises a media gateway node that performs conversion between data of said circuit switched network and data of said IP network when transferring user information, and a media gateway control function node that performs protocol conversion between a session initiation protocol and an ISDN user part when transferring control information.
19. An inter-network handover control method in a mobile communication system comprising at least one mobile terminal that can access a circuit switched network and a wireless broadband network, said method comprising:
integrating, into one physical node, a first gateway node interconnecting said circuit switched network and an IP network and a second gateway node interconnecting a core network accommodating said wireless broadband network and an external packet data network through said IP network,
wherein when said mobile terminal performs handover from one of said circuit switched network and said wireless broadband network, being a handover-source network, to the other network being a handover-destination network, one of said first gateway node and said second gateway node, being a handover-destination gateway node, allocates call connection path node identification information managed by the other gateway note being a handover-source gateway node, as new call connection path node identification information of said handover-destination gateway node.
20. The inter-network handover control method according to claim 19 , wherein when said mobile terminal performs handover from said wireless broadband network to said circuit switched network, said first gateway node allocates the call connection path node identification information in said wireless broadband network, which is the information managed by said second gateway node, as the call connection path node identification information of said circuit switched network.
21. The inter-network handover control method according to claim 19 , wherein when said mobile terminal performs handover from said circuit switched network to said wireless broadband network, said second gateway node allocates the call connection path node identification information in said circuit switched network, which is the information managed by said first gateway node, as the call connection path node identification information of said wireless broadband network.
22. The inter-network handover control method according to claim 19 , wherein the call connection path node identification information in said circuit switched network is an IP address of said first gateway node.
23. The inter-network handover control method according to claim 19 , wherein the call connection path node identification information in said wireless broadband network is an IP address of said mobile terminal.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008145211A JP2009296077A (en) | 2008-06-03 | 2008-06-03 | Mobile communication system, node device, and method for controlling inter-network transition |
JP2008-145211 | 2008-06-03 | ||
PCT/JP2009/060401 WO2009148173A1 (en) | 2008-06-03 | 2009-06-01 | Mobile communications system, node device, and method for controlling migration between networks |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/060401 A-371-Of-International WO2009148173A1 (en) | 2008-06-03 | 2009-06-01 | Mobile communications system, node device, and method for controlling migration between networks |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/754,442 Continuation US10375607B2 (en) | 2008-06-03 | 2013-01-30 | Mobile communication system, node apparatus, and inter-network handover control method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110069679A1 true US20110069679A1 (en) | 2011-03-24 |
Family
ID=41398245
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/992,636 Abandoned US20110069679A1 (en) | 2008-06-03 | 2009-06-01 | Mobile communication system, node apparatus, and inter-network handover control method |
US13/754,442 Active 2032-06-30 US10375607B2 (en) | 2008-06-03 | 2013-01-30 | Mobile communication system, node apparatus, and inter-network handover control method |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/754,442 Active 2032-06-30 US10375607B2 (en) | 2008-06-03 | 2013-01-30 | Mobile communication system, node apparatus, and inter-network handover control method |
Country Status (7)
Country | Link |
---|---|
US (2) | US20110069679A1 (en) |
EP (1) | EP2285080A4 (en) |
JP (1) | JP2009296077A (en) |
KR (2) | KR101286848B1 (en) |
CN (2) | CN102047648A (en) |
TW (1) | TW201014384A (en) |
WO (1) | WO2009148173A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014106987A1 (en) * | 2013-01-04 | 2014-07-10 | Samsung Electronics Co., Ltd. | A method and system for providing enhanced packet data services to a user equipment |
US9525766B2 (en) | 2012-10-09 | 2016-12-20 | Zte Corporation | Method, device and system for automatically switching voice call services |
US20180054767A1 (en) * | 2016-08-19 | 2018-02-22 | Qualcomm Incorporated | Ue network mobility during ims |
US10855847B2 (en) * | 2014-06-25 | 2020-12-01 | Textnow, Inc. | Mobile electronic communications using internet protocol |
CN114514792A (en) * | 2019-10-10 | 2022-05-17 | 银河电讯集团 | Mobile Wireless Broadband Network Interface Card (MWBNIC) and K network |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101924751B (en) | 2009-05-22 | 2013-11-06 | 中兴通讯股份有限公司 | Single-mode service continuity implementation method and single-mode service continuity system |
JPWO2011162349A1 (en) * | 2010-06-24 | 2013-08-22 | 日本電気株式会社 | Gateway device, mobile circuit switching network, voice data relay method and program |
EP3091783B1 (en) | 2014-01-29 | 2018-08-29 | Huawei Technologies Co., Ltd. | Handover control method, device, and wireless communications network |
CN104486193B (en) * | 2014-12-11 | 2017-11-24 | 华为技术有限公司 | A kind of method and device for establishing network node interconnection |
CN109219941A (en) * | 2017-05-08 | 2019-01-15 | 华为技术有限公司 | Network equipment control right transfer method and apparatus |
CN109067761B (en) * | 2018-08-29 | 2020-07-28 | 句容市凯特电力电器有限公司 | Wireless network mobility management method based on SIP |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040246990A1 (en) * | 2003-06-04 | 2004-12-09 | Nokia Corporation | System and method for handing over a call from a packet-switched network to a circuit-switched network |
US20070291733A1 (en) * | 2004-03-04 | 2007-12-20 | Outsmart Ltd. | Integration of Packet and Cellular Telephone Networks |
US20080117884A1 (en) * | 2004-12-15 | 2008-05-22 | Hidenori Ishii | Radio Network Controller, Wireless Access Gateway, Radio Communication System, and Communication Method for Radio Communication System |
US20100246530A1 (en) * | 2007-06-08 | 2010-09-30 | Arne Pehrsson | Handover From Circuit Switched Domain to Circuit Switched Service Over Packet Switched Domain |
Family Cites Families (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4002843B2 (en) * | 2003-01-09 | 2007-11-07 | 株式会社エヌ・ティ・ティ・ドコモ | Gateway device, communication establishment method, and communication establishment system |
DE10359228A1 (en) * | 2003-12-17 | 2005-07-14 | Kneissl Tirol Gmbh | Snow glider, especially carving skis |
US7366514B2 (en) * | 2004-04-14 | 2008-04-29 | Lucent Technologies Inc. | Method of handing off a packet switched to a circuit switched call |
US7136651B2 (en) * | 2004-08-30 | 2006-11-14 | Tatara Systems, Inc. | Mobile services control platform providing a converged voice service |
JP4460400B2 (en) * | 2004-09-07 | 2010-05-12 | 株式会社エヌ・ティ・ティ・ドコモ | Communication system and communication method |
JP2006186855A (en) * | 2004-12-28 | 2006-07-13 | Nippon Telegr & Teleph Corp <Ntt> | Band securing and routing method in ip network |
GB2467856B8 (en) * | 2005-01-03 | 2010-10-06 | Fellowes Inc | Portable laminator. |
JP4472537B2 (en) * | 2005-01-21 | 2010-06-02 | パナソニック株式会社 | Packet control apparatus, authentication server, and wireless communication system |
JP4642506B2 (en) * | 2005-03-04 | 2011-03-02 | パナソニック株式会社 | Identification address setting device and mobile network packet relay device having the same |
CN100450282C (en) | 2005-04-05 | 2009-01-07 | 华为技术有限公司 | Switching method for circuit exchange call connection |
CN101156488B (en) * | 2005-04-05 | 2012-09-26 | 松下电器产业株式会社 | Radio communication system and radio communication method |
KR100619385B1 (en) | 2005-06-02 | 2006-09-06 | 에스케이 텔레콤주식회사 | Method for forming and transmitting network/ip imformation for interworking network between portable internet and mobile communication network |
KR20080014862A (en) * | 2005-06-15 | 2008-02-14 | 아자이르 네트웍스, 인코포레이티드 | Voice call continuity application server between ip-can and cs networks |
KR100909542B1 (en) * | 2005-08-01 | 2009-07-27 | 삼성전자주식회사 | Method and apparatus for interworking voice and multimedia service between a CSI terminal and an IMS terminal |
US8811954B1 (en) * | 2005-10-31 | 2014-08-19 | Genband Us Llc | Network domain selection |
US20070224988A1 (en) * | 2006-03-24 | 2007-09-27 | Interdigital Technology Corporation | Method and apparatus for performing a handover procedure between a 3gpp lte network and an alternative wireless network |
US8023497B2 (en) * | 2006-04-19 | 2011-09-20 | Qualcomm Incorporated | Method and apparatus for dynamic anchoring of CS calls for CS-to-VoIP handoffs |
EP2033477A4 (en) * | 2006-06-14 | 2014-01-08 | Apple Inc | Method for transitioning support of communication sessions for a user element between different types of subsystems of different generations |
JP2008028663A (en) | 2006-07-20 | 2008-02-07 | Ntt Docomo Inc | Method and device for communication control |
JP5309430B2 (en) * | 2006-07-31 | 2013-10-09 | 富士通株式会社 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND COMMUNICATION PROGRAM |
WO2008015660A1 (en) * | 2006-08-03 | 2008-02-07 | Accuris Technologies Limited | A roaming gateway |
US7760712B2 (en) * | 2006-08-11 | 2010-07-20 | Research In Motion Limited | System and method for managing call continuity in IMS network environment |
JP5273739B2 (en) * | 2006-10-04 | 2013-08-28 | アップル インコーポレイテッド | Circuit switching and multimedia subsystem voice continuation |
JPWO2008059570A1 (en) * | 2006-11-15 | 2010-02-25 | パナソニック株式会社 | COMMUNICATION TERMINAL DEVICE, COMMUNICATION SYSTEM, AND SEAMLESS HANDOVER METHOD |
JP2008145211A (en) | 2006-12-08 | 2008-06-26 | Kurita Water Ind Ltd | Blocking prevention structure and blocking prevention method of distal pipeline for measurement |
EP2140648B1 (en) * | 2007-03-30 | 2011-10-26 | Telefonaktiebolaget L M Ericsson (publ) | System and method for indicating circuit switched access at ims registration |
US9706045B2 (en) * | 2007-04-30 | 2017-07-11 | Blackberry Limited | System and method for integrating an outgoing cellular call as an enterprise call in an IMS environment |
US20080276068A1 (en) * | 2007-05-03 | 2008-11-06 | Syed Reaz Ashraf | IMS network architecture with integrated network elements |
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 |
US7885234B2 (en) * | 2007-10-01 | 2011-02-08 | Alcatel-Lucent Usa Inc. | Method and system for providing voice call continuity |
US8422405B2 (en) * | 2008-03-17 | 2013-04-16 | Apple Inc. | Mobile switching center platform having interfaces with functionalities defined by an architecture that provides packet-switched multimedia subscriber services |
-
2008
- 2008-06-03 JP JP2008145211A patent/JP2009296077A/en active Pending
-
2009
- 2009-06-01 WO PCT/JP2009/060401 patent/WO2009148173A1/en active Application Filing
- 2009-06-01 KR KR1020127010146A patent/KR101286848B1/en active IP Right Grant
- 2009-06-01 KR KR1020107029121A patent/KR101246472B1/en active IP Right Grant
- 2009-06-01 CN CN2009801195199A patent/CN102047648A/en active Pending
- 2009-06-01 CN CN201310232875.XA patent/CN103384397B/en not_active Expired - Fee Related
- 2009-06-01 EP EP09758440.3A patent/EP2285080A4/en not_active Withdrawn
- 2009-06-01 US US12/992,636 patent/US20110069679A1/en not_active Abandoned
- 2009-06-03 TW TW098118438A patent/TW201014384A/en unknown
-
2013
- 2013-01-30 US US13/754,442 patent/US10375607B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040246990A1 (en) * | 2003-06-04 | 2004-12-09 | Nokia Corporation | System and method for handing over a call from a packet-switched network to a circuit-switched network |
US20070291733A1 (en) * | 2004-03-04 | 2007-12-20 | Outsmart Ltd. | Integration of Packet and Cellular Telephone Networks |
US20080117884A1 (en) * | 2004-12-15 | 2008-05-22 | Hidenori Ishii | Radio Network Controller, Wireless Access Gateway, Radio Communication System, and Communication Method for Radio Communication System |
US20100246530A1 (en) * | 2007-06-08 | 2010-09-30 | Arne Pehrsson | Handover From Circuit Switched Domain to Circuit Switched Service Over Packet Switched Domain |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9525766B2 (en) | 2012-10-09 | 2016-12-20 | Zte Corporation | Method, device and system for automatically switching voice call services |
WO2014106987A1 (en) * | 2013-01-04 | 2014-07-10 | Samsung Electronics Co., Ltd. | A method and system for providing enhanced packet data services to a user equipment |
US10271256B2 (en) | 2013-01-04 | 2019-04-23 | Samsung Electronics Co., Ltd. | Method and system for providing enhanced packet data services to a user equipment |
US10855847B2 (en) * | 2014-06-25 | 2020-12-01 | Textnow, Inc. | Mobile electronic communications using internet protocol |
US11399099B2 (en) | 2014-06-25 | 2022-07-26 | Textnow, Inc. | Mobile electronic communications using internet protocol |
US20180054767A1 (en) * | 2016-08-19 | 2018-02-22 | Qualcomm Incorporated | Ue network mobility during ims |
CN109644182A (en) * | 2016-08-19 | 2019-04-16 | 高通股份有限公司 | UE network mobility during the incoming IMS call setup to preferred network |
US10609613B2 (en) * | 2016-08-19 | 2020-03-31 | Qualcomm Incorporated | UE network mobility during IMS |
AU2017313148B2 (en) * | 2016-08-19 | 2022-03-24 | Qualcomm Incorporated | UE network mobilty during incoming ims call setup to preferred network |
CN114514792A (en) * | 2019-10-10 | 2022-05-17 | 银河电讯集团 | Mobile Wireless Broadband Network Interface Card (MWBNIC) and K network |
Also Published As
Publication number | Publication date |
---|---|
WO2009148173A1 (en) | 2009-12-10 |
KR101286848B1 (en) | 2013-07-17 |
EP2285080A4 (en) | 2013-07-10 |
US20130148630A1 (en) | 2013-06-13 |
TW201014384A (en) | 2010-04-01 |
KR20120058615A (en) | 2012-06-07 |
CN103384397A (en) | 2013-11-06 |
KR20110013521A (en) | 2011-02-09 |
CN102047648A (en) | 2011-05-04 |
JP2009296077A (en) | 2009-12-17 |
EP2285080A1 (en) | 2011-02-16 |
CN103384397B (en) | 2016-10-26 |
US10375607B2 (en) | 2019-08-06 |
KR101246472B1 (en) | 2013-03-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10375607B2 (en) | Mobile communication system, node apparatus, and inter-network handover control method | |
US9801101B2 (en) | Method and device for handling handover of a communications service | |
EP2130311B1 (en) | Handover apparatus and method in a heterogeneous wireless communication system | |
JP4654834B2 (en) | Mobile communication system, switching center server, mobile terminal apparatus, and handover method used therefor | |
US20130039343A1 (en) | Mobile wireless system, access point device, and handover processing method | |
US20100075651A1 (en) | Method and Apparatus for Providing Circuit Switched Domain Services Over a Packet Switched Network | |
JP2008547289A (en) | Voice call continuity application server between IP-CAN and CS network | |
US20050195762A1 (en) | Communication system | |
US9462618B2 (en) | Method of call setup time reduction for voice over LTE | |
JPWO2008044265A1 (en) | Call connection processing method and message transmission / reception proxy device | |
US8233417B1 (en) | Femtocell architecture using internet protocol multimedia subsystem centralized services | |
KR100895283B1 (en) | Apparatus and call setup method for providing mobile voip service | |
JP5695175B2 (en) | Mobile communication system, node device, and inter-network transition control method | |
JP2012257261A (en) | Mobile communication system, node device and internetwork transition control method | |
US20100290432A1 (en) | Communication control device, communication system, communication control method and communication control program | |
JP2011166369A (en) | Extension call method and communication system | |
WO2016152095A1 (en) | Network device, base station, communication system, bearer establishing method, communication method, and non-transitory computer-readable medium |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NEC CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ONISHI, KOJI;TAMURA, TOSHIYUKI;REEL/FRAME:025361/0950 Effective date: 20101111 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |