WO2014048455A1 - Méthode de retour d'un ue dans un réseau de communication préféré après l'établissement d'une communication cs de substitution - Google Patents

Méthode de retour d'un ue dans un réseau de communication préféré après l'établissement d'une communication cs de substitution Download PDF

Info

Publication number
WO2014048455A1
WO2014048455A1 PCT/EP2012/068879 EP2012068879W WO2014048455A1 WO 2014048455 A1 WO2014048455 A1 WO 2014048455A1 EP 2012068879 W EP2012068879 W EP 2012068879W WO 2014048455 A1 WO2014048455 A1 WO 2014048455A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
preferred
node
frp
control node
Prior art date
Application number
PCT/EP2012/068879
Other languages
English (en)
Inventor
Ralf Keller
Fredrik Lindholm
Peter Hedman
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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 Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/EP2012/068879 priority Critical patent/WO2014048455A1/fr
Publication of WO2014048455A1 publication Critical patent/WO2014048455A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • 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]

Definitions

  • the invention is about a method for moving a user equipment, UE, from a circuit-switched, CS, communication network to a preferred packet switched, PS, communication network, wherein the UE is attached via a radio access network, RAN, node to the CS network for executing a CS service.
  • the invention further relates to a RAN node and a core network control node of the CS network for executing said method.
  • LTE Long Term Evolution
  • SAE System Architecture Evolution
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • SAE System Architecture Evolution
  • the LTE radio access network technology implements only a packet switched access, in contrast to 2G and 3G (using GERAN and UTRAN radio access network technologies respectively) which provide for both packet switched and circuit switched access.
  • 2G and 3G networks packet switched connections are used to carry data whilst circuit switched connections are used for real-time services such as CS services.
  • 4G networks all services will be carried via packet switched connections.
  • Enhanced UTRAN or E-UTRAN that call will of course make use of a packet switched connection.
  • the call must be switched from a packet switched (PS) access to a circuit switched (CS) access.
  • PS packet switched
  • CS circuit switched
  • FIG. 1 illustrates schematically a scenario in which a user terminal (or User Equipment, UE, according to 3G terminology) initiates a CS service, esp. a voice call using a LTE radio access network and is subsequently handed over to a GSM/Edge Radio Access Network (GERAN).
  • the call is established using the IP Multimedia Subsystem (IMS) network defined by the Third Generation Partnership Project (3GPP) to provide IP Multimedia services over mobile communication networks and which provides a common service control network for the PS and CS domains provided through the LTE, UTRAN, or GERAN radio accesses.
  • the IMS includes a Multimedia Telephony (MMTel) Application Server which implements service logic for establishing and controlling voice calls.
  • MMTel Multimedia Telephony
  • EPC Evolved Packet Core
  • MSC Mobile Switching Centre
  • Other components illustrated in Figure 1 are a Mobile Switching Centre Server (MSS) which has support for the GSM access network, an enhanced Node B (eNodeB) which provides inter alia control of radio access within the LTE RAN, a Serving/PDN gateway (S/P-GW), a Mobility Management Entity (MME) (both the S/P-GW and the MME reside within the EPC), and a Home Subscriber Server (HSS) as a user database that resides within a subscriber's home network.
  • MMS Mobile Switching Centre Server
  • S/P-GW Serving/PDN gateway
  • MME Mobility Management Entity
  • HSS Home Subscriber Server
  • IMS IP Multimedia Subsystem
  • ICS Interworking solutions for IMS Centralized Services (ICS) as specified in 3GPP TS 23.292, "IP Multimedia Subsystem (IMS) centralized services; Stage 2", allows IMS sessions using CS bearers to be treated as standard IMS sessions, which is required for the purpose of IMS Service Continuity.
  • ICS defines signalling mechanisms between the UE and IMS for transport of information to centralise the service in the IMS, and TS 23.237 "IP Multimedia Subsystem (IMS) Service Continuity" defines the additional procedures needed for service continuity when using CS access for media transport.
  • IMS IP Multimedia Subsystem
  • the current solution for SRVCC does not include the possibility to move the UE back to its preferred network when the transferred call has been completed or stopped.
  • the preferred network could be any kind of network which is preferred in the subscription of the subscriber using the UE.
  • LTE or any other high speed packet access (HSPA) network could be the preferred network for a UE.
  • a method for moving a user equipment, UE, from a circuit-switched, CS, communication network to a preferred packet switched, PS, communication network The UE is attached via a radio access network, RAN, node to the CS network for executing a CS service.
  • the method comprises the step of providing, by a core network control node of the preferred PS network, a fast-return- preference, FRP, indicator which is associated to the UE, to a core network control node of the CS network.
  • FRP fast-return- preference
  • the method comprises the steps of forwarding, by the core network control node of the CS network, the FRP indicator to the RAN node and initiating, by the RAN node, a move of the UE to the preferred PS network, based on the FRP indicator, if the UE can be connected to the preferred PS network and the CS service in the CS network is stopped.
  • a radio access network, RAN, node which serves a user equipment, UE for executing a CS service in a circuit switched, CS, network.
  • the RAN node comprises receiving means for receive a fast-return-preference, FRP, indicator from a core network control node of the CS network and processing means for initiating a move of the UE to a preferred packet switched, PS, network if the UE can be connected to the preferred PS network and the provisioning of the CS service in the CS network is stopped.
  • FRP fast-return-preference
  • a core network control node of a circuit switched, CS, network wherein a user equipment, UE, is attached via a radio access network, RAN, node to said control node to execute a voice call.
  • the core network control node of a CS network comprises receiving means for receiving from a control node of a packet switched, PS, network which is the preferred network of the UE, a fast- return-preference, FRP, indicator and sending means for forwarding the FRP indicator to said RAN node to indicate that the UE should move to the preferred PS network if the UE can be connected to the preferred PS network and the provisioning of the CS service in the CS network is stopped.
  • the present invention also concerns computer programs comprising portions of software codes in order to implement the method as described above when operated by a respective processing unit of a user device and a recipient device.
  • the computer program can be stored on a computer-readable medium.
  • the computer-readable medium can be a permanent or rewritable memory within the user device or the recipient device or located externally.
  • the respective computer program can also be transferred to the user device or recipient device for example via a cable or a wireless link as a sequence of signals.
  • Fig. 1 illustrates schematically a prior art architecture for managing PS to
  • Fig. 2 shows a flow diagram illustrating one embodiment of the invention
  • Fig. 3 shows an inter-node signaling according to different embodiments of the invention
  • Fig. 4 shows an inter-node signaling according to different embodiments of the invention
  • Fig. 5 shows an inter-node signaling according to different embodiments of the invention
  • Fig. 6 shows schematically an apparatus configured to operate as a RAN node
  • Fig. 7 shows schematically an apparatus configured to operate as a core network control node
  • Fig. 2 is a flow diagram showing steps of the method. It is assumed that the subscriber or user equipment has a preferred packet switched, PS, network. This preferred network comprises the parameters which fit best with the needs of the subscriber. It might be possible that the preferred network is a Long term Evolution, LTE, network which provides a high bandwidth and data rate for a high speed access to the internet. It is further possible that the preferred network is a High Speed Packet Access, HSPA, network which is an extension and improvement of 3 rd generation mobile telecommunication networks utilizing Wideband Code Division Multiple Access, W-CDMA, protocols. It might also be possible that the preferred network is defined based on a specific network operator.
  • LTE Long term Evolution
  • HSPA High Speed Packet Access
  • W-CDMA Wideband Code Division Multiple Access
  • the user equipment is currently attached via a Radio Access Network, RAN, node to a Circuit Switched, CS, network for executing a CS service.
  • the CS service can be e.g. a voice call or a short message service or any other service in a circuit switched network.
  • the subscriber or user equipment has been handed over from this preferred packet switched, PS, network to a circuit switched, CS, network which allows the provisioning of a CS service. This previous handover can be based on a decision from a RAN node of the preferred network. It is further possible that the handover from the preferred PS network to the CS network is according to a Single Radio Call Continuity, SRVCC, handover procedure.
  • SRVCC Single Radio Call Continuity
  • a fast return preference (FRP) indicator is provided by a core network control node of the preferred PS network to a core network node of the CS network.
  • a core network control node is a Mobility Management Entity, MME, node in the Evolved Packet Core, EPC. It is also possible that any other node of the core network is able to provide this indicator.
  • the provisioning of this FRP indicator can be done in several ways. It is possible that the FRP indicator is stored in a user database of the preferred PS network. The subscriber can indicate this preference in his subscription so that the network operator can enter this preference in the user database.
  • the user database can be a Home Subscriber Server (HSS) which is located in the PS core network.
  • HSS Home Subscriber Server
  • the subscriber or UE is able to provide this FRP indicator directly to the network during a handover procedure from his preferred PS network to a non- preferred network which can be any CS or PS network.
  • a non- preferred network which can be any CS or PS network.
  • This can e.g. be done in the Attach-message, the Tracking Area Update (TAU) message, the Routing Area Update (RAU) message or in the Location Area Update (LAU) message.
  • the UE can indicate its preference in a Handover Complete message.
  • the FRP indicator is forwarded by the core network control node of the CS network to the RAN node which is currently serving the UE.
  • This RAN could be Base Station Subsystem, BSS, or a Radio Network System, RNS in UMTS. It is possible, according to another embodiment of the invention that the FRP indicator is further forwarded to other RAN nodes so that every RAN node which possibly serves the UE after a handover due to a geographically movement of the UE comprises the FRP indicator.
  • the other RAN nodes can be nodes which are also controlled by this CS network or by another CS or PS network.
  • a CS service can e.g. be provided by executing a CS voice call or by sending a SMS message.
  • This step 230 can be executed by the RAN node which serves the UE or by a control node of the CS network which can be a Mobile Switching Center (MSC) which then informs the RAN node about this incident.
  • MSC Mobile Switching Center
  • step 250 is only performed if the provisioning of the CS service in the CS network is stopped or terminated and if the UE can be connected to the preferred PS network, e.g. via a radio link.
  • the RAN node initiates a move of the UE from the CS network to the preferred PS network as fast as possible.
  • the RAN node can indicate this move to a core network control node of the CS network so that this control node can start the proceedings for a move of the UE to the preferred PS network.
  • Fig. 3 shows an inter-node signaling diagram, based on section 5.3.2.1 of standard 3GPP TS 23.401 Version 10.8.0 which is here within incorporate by reference. Due to clarity reasons only a few steps have been shown in Fig. 3. The other steps of the figure in the standard might also apply. The numbering of the steps is in accordance with the figure of section 5.3.2.1 in the standard.
  • Fig. 3 shows an E-UTRAN Initial attach procedure which is performed before the UE 310 is attached to the CS network for executing a CS service, like a voice call, or a SMS sending.
  • the UE 310 initiates the Attach procedure by the transmission of an Attach Request message to the evolved Node B (eNodeB) 320, which is in this embodiment the RAN node of the preferred PS network.
  • the eNodeB 320 forwards the Attach Request message to a selected or new MME 330.
  • the eNodeB 310 can derive the new MME 330 from the Radio Resource Control (RRC) parameter carrying the old Globally Unique MME Identifier (GUMMEI) and the indicated selected network.
  • RRC Radio Resource Control
  • GUMMEI Globally Unique MME Identifier
  • step 8 the new MME 330 sends an Update Location Request (comprising e.g.
  • the HSS 340 acknowledges the Update Location message in step 1 1 by sending an Update Location Acknowledge (comprising e.g. the IMSI and Subscription data) message to the new MME 330.
  • Update Location Acknowledge comprising e.g. the IMSI and Subscription data
  • this Update Location Acknowledge message comprises additionally an indicator that the UE 310 prefers fast return or move to its preferred PS network.
  • This FRP indicator can be an additional information element in the Update Location Acknowledge message.
  • the new MME 330 forwards the FRP indicator in an Attach Accept message to the eNodeB 320 in step 17.
  • the numbering of the messages is in accordance with the numbering in the original diagram of the standard. The diagram showing the Initial Attach procedure in Fig. 3 is not complete. Further messages must be added. It is shown that the eNodeB 320 as a RAN node of the preferred PS network comprises the FRP indicator for this specific UE 310.
  • the FRP indicator is provided to the eNodeB 320 by sending the Attach Request message in step 1 from the UE 310.
  • the UE 310 provides the FRP indicator directly to the eNodeB 320 of its preferred PS network. This possibility is not depicted in Fig. 3.
  • Fig. 4 shows an inter-node signaling diagram, based on section 6.2.2.2 of standard 3GPP TS 23.216 Version 10.4.0 which is here within incorporate by reference. Due to clarity reasons only few steps and nodes have been shown in Fig. 4 which are important for the understanding of the invention. The numbering of the steps is in accordance with the figure of section 6.2.2.2 in the standard.
  • This Fig. 4 shows a call flow for SRVCC from E-UTRAN to UTRAN/GERAN comprising two embodiments of the invention (solution 1 and solution 2).
  • Fig. 4 handles the situation after the FRP indicator has been stored in the RAN node of the preferred PS network or in the core network control node of the preferred PS network as depicted in Fig. 3
  • the UE 410 sends a Measurement Report to the source E-UTRAN node 420, which could be an eNodeB. Based on UE measurement reports and based on the need of the UE 410 to execute a CS service the source E-UTRAN node 420 decides to trigger an SRVCC handover to UTRAN/GERAN.
  • the source E-UTRAN 420 sends a Handover Required message to the source MME 430.
  • SRVCC HO indication indicates to MME 430 that this is for CS+PS HO.
  • the Handover Required message comprises an FRP indicator, which indicates a preference of the UE 410 to return fast to the preferred PS network.
  • the source MME 430 splits the voice bearer in step 4 from all other PS bearers and initiates their relocation towards the MSC Server 450 and SGSN 460, respectively.
  • the source MME 430 initiates the PS-CS handover procedure for the voice bearer by sending a SRVCC PS to CS Request message to the MSC Server 440 comprising, for solution 2, additionally the FRP indicator.
  • the MSC Server 440 interworks the PS-CS handover request with a CS inter MSC handover request by sending a Prepare Handover Request message to the target MSC 450 in step 5b. According to solution 2, this message comprises additionally the FRP indicator.
  • the target MSC 450 requests resource allocation for the CS relocation by sending the Relocation Request/Handover Request message to the target RNS/BSS 470 including, for solution 2, the FRP indicator.
  • the source MME 430 initiates relocation of the PS bearers. Therefore the Source MME 430 sends a Forward Relocation Request message to the target SGSN 460 in step 6a.
  • This message comprises, according to another embodiment of the invention, the FRP indicator, depicted as solution 1 in Fig. 4.
  • the Target SGSN 460 requests in step 6b resource allocation for the PS relocation by sending the Relocation Request/Handover Request message to the target RNS/BSS comprising, according to solution 1 , the FRP indicator.
  • the target RNS/BSS 470 node comprises an indication which indicates that the served UE 410 has a preference to return to its preferred PS network as fast as possible.
  • Fig. 4 further shows that the handover from E-UTRAN to GERAN/UTRAN will be continued and a CS call is established afterwards.
  • FIG. 5 Another embodiment of the invention is depicted in Fig. 5.
  • This embodiment is based on an Inter Radio Access Technology (RAT) Handover preparation phase as described in 3GPP standard TS 23.401 Version 10.8.0, section 5.5.2.1 .2 which is here within incorporate by reference. Due to clarity reasons only few steps and nodes have been shown in Fig. 5 which are important for the understanding of the invention. The numbering of the steps is in accordance with the figure of section 5.5.2.1 .2 in the standard.
  • the source eNodeB 520 decides to initiate an Inter-RAT handover to the target access network.
  • the source eNodeB 520 sends in step 2 a Handover Required message to the source MME 540 to request the core network to establish resources in the target RNC 530, target SGSN 550 and the Serving GW which is not depicted here. Additionally the Fast Return Preference (FRP) indication is provided from the source RAN, which is the Source eNodeB 520 in this embodiment, to the Source MME 540 as the core network control node.
  • the source MME 540 determines that the type of handover is an IRAT Handover to UTRAN lu mode.
  • the Source MME 540 initiates the Handover resource allocation procedure by sending, in step 3, a Forward Relocation Request message to the target SGSN 550. This message comprises additionally the FRP indicator.
  • the target SGSN requests in step 5 the target RNC 530 to establish the radio network resources (RABs) by sending the message Relocation Request, Encryption information to the Target RNC 530.
  • This message also comprises the FRP indicator.
  • the target RNC 530 allocates the resources and returns the applicable parameters to the target SGSN 530 in step 5a in the message Relocation Request Acknowledge. Further steps are provided to execute the remaining steps for the handover procedure to UTRAN.
  • the FRP indicator is provided to the Target RNC 530 in a Handover to UTRAN complete message by the UE 510 after completion of the handover.
  • the FRP indicator must therefore be stored in the UE 510. It is possible that the subscriber information in the UE 510 comprises this indicator.
  • Fig. 6 depicts schematically an apparatus configured to operate as a RAN node 600 which is adapted to serve a UE for executing a CS service in a CS network.
  • the RAN node 600 comprises receiving means 610 which is adapted to receive a FRP indicator from a core network control node of the CS network.
  • the RAN node 600 comprises processing means 620 for initiating a move of the UE to a preferred PS network if the UE can be connected to the preferred PS network and the provisioning of the CS service in the CS network is stopped.
  • Fig. 7 shows schematically an apparatus configured to operate as a core network control node 700.
  • the UE is attached via a RAN node to said core network control node 700 to execute a CS service.
  • the core network control node 700 comprises receiving means 710 for receiving from a control node of a PS network which is the preferred network of the UE, a FRP indicator.
  • the core network control node 700 further comprises sending means 720 for forwarding the FRP indicator to said RAN node to indicate that the UE should move to the preferred PS network if the UE can be connected to the preferred PS network and the provisioning of the CS service in the CS network is stopped.

Landscapes

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

Abstract

L'invention concerne une méthode de passage d'un équipement utilisateur (UE) d'un réseau à communication commutée (CS) à un réseau à communication par paquets (PS) préféré. L'UE est attaché au réseau CS par un nœud RAN (Radio Access Network) pour exécuter un service CS. La méthode consiste à fournir, par un nœud de contrôle de réseau d'infrastructure du réseau PS préféré, un indicateur de préférence de retour rapide (FRP), qui est associé à l'UE, à un nœud de contrôle de réseau d'infrastructure du réseau CS. De plus, la méthode consiste à transférer, par le nœud de contrôle de réseau d'infrastructure du réseau CS, l'indicateur FRP au nœud RAN et lancer, par le nœud RAN, un passage de l'UE vers le réseau PS préféré, en fonction de l'indicateur FRP, si l'UE peut être connecté au réseau PS préféré et la prestation du service CS dans le réseau CS est arrêtée.
PCT/EP2012/068879 2012-09-25 2012-09-25 Méthode de retour d'un ue dans un réseau de communication préféré après l'établissement d'une communication cs de substitution WO2014048455A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/068879 WO2014048455A1 (fr) 2012-09-25 2012-09-25 Méthode de retour d'un ue dans un réseau de communication préféré après l'établissement d'une communication cs de substitution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/068879 WO2014048455A1 (fr) 2012-09-25 2012-09-25 Méthode de retour d'un ue dans un réseau de communication préféré après l'établissement d'une communication cs de substitution

Publications (1)

Publication Number Publication Date
WO2014048455A1 true WO2014048455A1 (fr) 2014-04-03

Family

ID=46970261

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/068879 WO2014048455A1 (fr) 2012-09-25 2012-09-25 Méthode de retour d'un ue dans un réseau de communication préféré après l'établissement d'une communication cs de substitution

Country Status (1)

Country Link
WO (1) WO2014048455A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105282799A (zh) * 2014-06-03 2016-01-27 联发科技股份有限公司 移动通信装置及跨无线接入技术性能增强方法
WO2019090770A1 (fr) * 2017-11-13 2019-05-16 Oppo广东移动通信有限公司 Procédé de détermination de type de réseau central pendant un processus de transfert intercellulaire, dispositif terminal, dispositif de réseau d'accès et dispositif de réseau central

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011096870A1 (fr) * 2010-02-02 2011-08-11 Telefonaktiebolaget L M Ericsson (Publ) Retour d'équipement utilisateur à un réseau d'accès radio source
US20110222509A1 (en) * 2010-03-10 2011-09-15 Via Telecom, Inc. Fast reselection to other rat after csfb

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011096870A1 (fr) * 2010-02-02 2011-08-11 Telefonaktiebolaget L M Ericsson (Publ) Retour d'équipement utilisateur à un réseau d'accès radio source
US20110222509A1 (en) * 2010-03-10 2011-09-15 Via Telecom, Inc. Fast reselection to other rat after csfb

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
3GPP: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2 (Release 10)", 3GPP DRAFT; 23272-A80, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, 6 July 2012 (2012-07-06), XP050625321 *
SA2: "LS on Fast Return after CSFB", 3GPP DRAFT; GP-111570_S2-114712_E-MAIL_REV3_S2-114581, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. TSG GERAN, no. Bratislava, Slovakia; 20111121 - 20111125, 14 November 2011 (2011-11-14), XP050560799 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105282799A (zh) * 2014-06-03 2016-01-27 联发科技股份有限公司 移动通信装置及跨无线接入技术性能增强方法
WO2019090770A1 (fr) * 2017-11-13 2019-05-16 Oppo广东移动通信有限公司 Procédé de détermination de type de réseau central pendant un processus de transfert intercellulaire, dispositif terminal, dispositif de réseau d'accès et dispositif de réseau central
US11259224B2 (en) 2017-11-13 2022-02-22 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for determining core network type during handover process, terminal device, access network device, and core network device

Similar Documents

Publication Publication Date Title
US9408113B2 (en) Methods of and nodes for selecting a target core network for handing over a voice session of a terminal
KR101803253B1 (ko) 진화된 패킷 시스템에서 ｃｓ 폴백의 지원
JP5456883B2 (ja) Ｐｓからｃｓへのハンドオーバ・インジケータ
US9883475B2 (en) LTE network selection method, device, and system
US20100260105A1 (en) Domain transfer service continuity provision to a mobile terminal
US9826440B2 (en) Network handover method, device, and system
US20110200011A1 (en) Methods, apparatuses and computer software for extending the mme-ganc interface to report which ues have registered for the gan to tunnel cs voice over evolved packet system (eps)
EP2661123B1 (fr) Procédé de transfert intercellulaire et élément de réseau de gestion de mobilité
EP2999265B1 (fr) Procédé, dispositif et système pour transfert de réseau
US20100135246A1 (en) Mobility solution selection for voice over eps
JP2011508496A (ja) Ｍｔおよびｍｏの呼のドメイン間調整
US10028177B2 (en) Network handover method, device, and system
US20150024703A1 (en) Handover of emergency call anchored in ims to a circuit switched access network
KR20150131902A (ko) 음성 호 서비스 품질을 높이는 방법 및 장치
EP3280178B1 (fr) Procédé, dispositif de réseau et système permettant un repli sur commutation de circuits
EP2288205B1 (fr) Méthode et dispositif pour l'itinérance entre un HPLMN avec CSoPS IWF fonction d'interfonctionnement et un VPLMN supportant SRVCC
CN104380798B (zh) 一种网络切换的方法、设备及系统
CN109089289B (zh) 切换到电路交换域的方法和装置
US11470528B2 (en) Technique for preparing user equipment mobility
WO2014048455A1 (fr) Méthode de retour d'un ue dans un réseau de communication préféré après l'établissement d'une communication cs de substitution
CN106105326B (zh) 无线电接入网络重选处理
KR101451419B1 (ko) 네트워크 천이 방법, 이 방법을 수행하는 기지국 장치 및 이동 단말
CN104081821B (zh) 视频呼叫的反向切换的方法和装置
Penttinen et al. LTE‐A Functionality

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12768770

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12768770

Country of ref document: EP

Kind code of ref document: A1