Abstract: The present invention discloses a mobility management method, a serving GPRS support node or mobility management entity (SGSN/MME), and a terminal to solve the problem of setting or dynamically modifying the mobility management frequency of a particular terminal among numerous terminals. The technical solution of the present invention includes: obtaining subscription data of a terminal, where the subscription data carries periodic routing area update or tracking area update (RAU/TAU) setting information; obtaining a periodic RAU/TAU timer of the terminal according to the periodic RAU/TAU setting information; sending the periodic RAU/TAU timer of the terminal to the terminal; and setting a value that is a little longer than the periodic RAU/TAU timer of the terminal as a mobile reachable timer for monitoring the periodic RAU/TAU of the terminal. The embodiments of the present invention may be applied in low-mobility machine-type communication.

Abstract: A method for changing ICS session media includes: receiving a media type change request comprising a new media type sent from one of a terminal equipment, a mobile switching center (MSC), or a second party; releasing a circuit-switched (CS) call leg based on an original media type between an IMS CS control function (ICCF) and the terminal equipment; establishing a CS call leg based on the new media type between the ICCF and the terminal equipment; and updating the media type of a second call leg between the ICCF and a second party into the new media type or establishing a second call leg based on the new media type between the ICCF and the second party.

Abstract: A method, device, and system for transferring a Service Control Signalling Path are provided. The method for transferring a Service Control Signalling Path includes: establishing a connection with an opposite end by a User Equipment (UE), where the UE uses a Circuit Switched (CS) bearer in a CS network and a Service Control Signalling Path in a first Packet Switched (PS) network; sending a transfer request via a second PS network, to instruct a network side to transfer the Service Control Signalling Path according to the transfer request. Thus, the UE can replace a current Gm reference point with a Gm reference point of a new and available PS network when the PS network where the current Gm reference point is located is unavailable, so as to ensure smooth data transmission.

Abstract: A method includes receiving a multimedia request message; setting up a multimedia call path to a CS UE according to the multimedia request message; negotiating a media coding mode with the CS UE and negotiating the media coding mode with a peer UE according to the multimedia call path; and setting up a multimedia call between the CS UE and the peer UE after determining the coding mode of the CS UE and the peer UE. In the embodiments of the present invention, the MSC negotiates the coding mode of the CS UE and the peer UE (such as an IMS UE), and sets up a multimedia call between the CS UE and the peer UE, thus overcoming the inability of setting up a multimedia call between the CS UE and the peer UE in the prior art.

Abstract: A method, Application Server (AS) and User Equipment (UE) for transferring media streams of a multimedia session are provided. A first UE sends a request for transferring media streams of a multimedia session to an AS, where the request carries the ID of a third UE and the media type of media streams requested to be transferred; and the third UE establishes media streams of the media type with a second UE under the control of the AS.

Abstract: A call control method and an IP multimedia subsystem (IMS) circuit-switched (CS) control apparatus are disclosed. The call control method includes these steps: a terminal device and a second party set up a call through a CS call leg set up between the terminal device and an IMS CS control function (ICCF) and a second call leg set up between the ICCF and the second party; and the ICCF receives a media type change request, and rejects the change of media type for the call between the terminal device and the second party if more than one session is available on the terminal device. Embodiments of the present invention avoid call failure upon session transfer due to the change of media type in the prior art, thus improving the reliability and stability of session transfer.

Abstract: A method, device, and system for transferring a Service Control Signalling Path are provided. The method for transferring a Service Control Signalling Path includes: establishing a connection with an opposite end by a User Equipment (UE), where the UE uses a Circuit Switched (CS) bearer in a CS network and a Service Control Signalling Path in a first Packet Switched (PS) network; sending a transfer request via a second PS network, to instruct a network side to transfer the Service Control Signalling Path according to the transfer request. Thus, the UE can replace a current Gm reference point with a Gm reference point of a new and available PS network when the PS network where the current Gm reference point is located is unavailable, so as to ensure smooth data transmission.

Abstract: In the field of mobile communications, embodiments of the present invention disclose a service control method and apparatus. A user equipment has established a circuit switched bearer, and the user equipment initiates a session with a third party. The method includes: receiving, by a service centralization and continuity application server SCC AS, early session media information and sending the early session media information to a circuit switched network in a form of regular session media, so that the circuit switched bearer is used for an early session; and receiving, by the SCC AS, an off-hook signal of the third party and sending regular session media information of the third party to the circuit switched network, so that the circuit switched bearer is used for a regular session.

Abstract: A call transfer method, system, and device are provided. The method includes obtaining information that the mobile switching center (MSC) of a called user equipment (UE) executes a call transfer service, and instructing the MSC of the called UE to send a call request to a third party UE according to the call originating process of the called UE.

Abstract: A method and a device for holding calls between networks are disclosed herein. The method includes: receiving a call hold request sent by a UE in a CS network, where the call hold request carries an indication that the UE in the CS network will continue sending media streams; and instructing a peer device to keep receiving the media streams from the UE in the CS network and stop sending the media streams. In the technical solution under the present invention, the UE in the CS network partially releases the radio resources after initiating the call hold operation, and therefore, the UE in the CS network can play local media files to the peer device after the call is held, thus saving network resources and improving the user experience.

Abstract: A method for changing ICS session media includes: receiving a media type change request comprising a new media type sent from one of a terminal equipment, a mobile switching center (MSC), or a second party; releasing a circuit-switched (CS) call leg based on an original media type between an IMS CS control function (ICCF) and the terminal equipment; establishing a CS call leg based on the new media type between the ICCF and the terminal equipment; and updating the media type of a second call leg between the ICCF and a second party into the new media type or establishing a second call leg based on the new media type between the ICCF and the second party.

Abstract: The present invention discloses a mobility management method, a serving GPRS support node or mobility management entity (SGSN/MME), and a terminal to solve the problem of setting or dynamically modifying the mobility management frequency of a particular terminal among numerous terminals. The technical solution of the present invention includes: obtaining subscription data of a terminal, where the subscription data carries periodic routing area update or tracking area update (RAU/TAU) setting information; obtaining a periodic RAU/TAU timer of the terminal according to the periodic RAU/TAU setting information; sending the periodic RAU/TAU timer of the terminal to the terminal; and setting a value that is a little longer than the periodic RAU/TAU timer of the terminal as a mobile reachable timer for monitoring the periodic RAU/TAU of the terminal. The embodiments of the present invention may be applied in low-mobility machine-type communication.

Abstract: Embodiments of the present invention disclose a session processing method, device, and communication system. The session processing method includes: when a first User Equipment (UE) is to set up an IP Multimedia Subsystem (IMS) session with a second UE, triggering setup of an unstructured supplementary service data (USSD) transaction between a Circuit Switched (CS) network and the first UE; and sending, by using the USSD transaction, an I1 protocol message used to bear IMS session control signaling. With the technical solutions of the present invention, when a UE is to set up an IMS session, a USSD transaction is set up between the UE and the CS network; I1 protocol messages exchanged between the UE and the Service Centralization and Continuity (SCC) Application Server (AS) (SCC-AS) are sent reliably by using the USSD transaction, which facilitates reliable control over IMS services.

Abstract: A method and equipment for deregistering a wireless IP access network contact address are provided. When a call corresponding to a common subscriber ID of a TE is received after the TE leaves an IP access network abnormally, the method and the equipment can avoid problems caused by still delivering the subsequent call from the IP access network according to an IP access network contact address associated with the common subscriber ID. The method includes notifying an IMS network to deregister a contact address of a TE in a first wireless IP access network through a current available access network of the TE if the contact address of the TE in the first wireless IP access network is not deregistered to the IMS network when the TE leaves the first wireless IP access network.

Abstract: A multi-session transfer method, a call control device, and a Service Continuity and Continuity Application Server are disclosed. In the embodiments of the present invention, in a multi-session cross-network transfer process, if a second session to be transferred includes video media, a Mobile Switching Center (MSC) server judges capabilities of a current network. If the current network is incapable of transmitting video media, the MSC server sends a request for transferring voice media of the second session to be transferred. The SCC AS receives the transfer request, and converts the second session to be transferred into voice session for transferring or releases the second session to be transferred, and therefore, the problem in the prior art of incapability of transferring the session is avoided, and the cross-network multi-session service transfer is improved.

Abstract: Embodiments of the present invention disclose a method, an apparatus, and a system for service control via an I1 interface. The method includes: sending a Session Initiation Protocol Invite message to a user equipment through a Gm interface; if receiving a response message returned by the user equipment, where the response message indicates that the user equipment chooses to use a circuit switched bearer and use an I1 interface for control, sending an I1 Invite message to the user equipment through the I1 interface, where I1 Invite message carries information indicating that Gm interface control falls back to the I1 interface control and information used to associate the Session Initiation Protocol Invite message.

Abstract: A method, device, and system for transferring a Service Control Signalling Path are provided. The method for transferring a Service Control Signalling Path includes: establishing a connection with an opposite end by a User Equipment (UE), where the UE uses a Circuit Switched (CS) bearer in a CS network and a Service Control Signalling Path in a first Packet Switched (PS) network; sending a transfer request via a second PS network, to instruct a network side to transfer the Service Control Signalling Path according to the transfer request. Thus, the UE can replace a current Gm reference point with a Gm reference point of a new and available PS network when the PS network where the current Gm reference point is located is unavailable, so as to ensure smooth data transmission.

Abstract: A system and apparatus for providing services are provided by embodiments of the present invention. It is guaranteed that a UE is able to establish a call branch at the CS network side with a CSA. The CSA and the S-CSCF are able to establish a call branch at an IMS network side between the CSA and the S-CSCF for the UE. Embodiments of the present invention further provide a method for providing services. The method includes: registering a UE in a Circuit Switched, CS, network, registering the UE in an IP Multimedia Sub-system, IMS, network and establishing a call branch at the CS network side between the UE and the IMS network for an IMS session, wherein registering the UE in the IMS network comprises registering CS access capability of the UE in the IMS network. The system, apparatus and method provided by embodiments of the present invention for providing services may support a UE to access an IMS service platform via a CS network, which effectively reduces the cost.

Abstract: A network handover method applicable to network handover in ringing/ring back tone (RBT) or call hold is provided. According to this method, in ringing/RBT, one party performs a session negotiation with an Other End Point (OEP) via a call continuity application server, and then sends an off-hook signal to the OEP via the call continuity application server after the negotiation succeeds. Further, a call continuity application server and a user equipment (UE) are provided. According to the present disclosure, in ringing/RBT or call hold, even if the network coverage is not good, the UE may also be handed over to another network through call continuity, so as to effectively prevent the UE from dropping a call in ringing/RBT or call hold and thus improve the conversation quality of the user.

Abstract: In the field of communications, a session transfer method and a User Equipment (UE) are provided, so as to solve the problem that when a UE is involved in a voice session and a video session at the same time, session transfer cannot be performed. The technical solution according to the present invention includes: determining a session in an active state among a video session and a voice session; and initiating transfer of the session in the active state, so that a network side transfers the session in the active state to a Circuit Switched (CS) domain, and transfers a session in an inactive state among the video session and the voice session. The session transfer method and the UE may be applied in a radio communication network.