290 results about "Voice call continuity" patented technology

A system and method for continuous voice calls when a user switches between packet data and circuit switched access networks. In one example embodiment, the present innovations include an interworking system that supports voice call continuity for a user that moves between IP-CAN and CS networks (e.g., PSTN or GSM). In one example embodiment, the present innovations comprise a voice call continuity application server (VCC-AS) that serves as an anchor point for a voice call (i.e., it is the node from which a handover is initiated) and controls and handles voice calls to and from the user equipment (UE) regardless of the access network.

A system, method and computer-readable medium for concurrent support of Voice Call Continuity (VCC) capabilities in both the enterprise space and the carrier space are provided. The enterprise VCC functionality is used when the user is located in the enterprise domain which does not impact the carrier's network while the carrier VCC capability is used when the user is located in the carrier domain to support seamless handover between the wireless networks that the carrier may offer. The carrier VCC anchoring point and the enterprise VCC anchoring point may communicate with each other to confirm and inform the other anchoring point that a call handover is occurring or will occur.

A method, server and terminal for providing a Voice Call Continuity (VCC) service, are discussed. According to an embodiment, the terminal includes a storage unit to store operator policy information and user preference information, the user preference information including domain selection information specifying a user-preferred domain to be used when originating the outgoing call from the terminal, the operator policy information including domain selection information specifying a network-preferred domain to be used when originating the outgoing call from the terminal; and a controller to perform a domain selection for the outgoing call based on the user preference information or the operator policy information, depending on precedence information.

A method and apparatus for determining handover (HO) signaling in a communications network. The method of the present invention examines the International Mobile Subscriber Identity (IMSI) of a user equipment (UE) during HO and, based on the examination, determines whether Single Radio Voice Call Continuity (SRVCC) or circuit switched (CS) over Long Term Evolution (LTE) using a Generic Access Network Controller (GANC) should be used in the HO.

The invention proposes a method for handing over a session between a source network which provides a first connection type domain and a target network which provides the first connection type domain and a second connection type domain, comprising informing a network node (e.g., a user equipment (UE)), before performing forming a handover from the source network to the target network, a preferred transfer domain in the target network. The invention also proposes a corresponding network node and a network control element.

Methods and apparatuses for enabling Single Radio (SR)-Voice Call Continuity (VCC) of emergency calls are provided. More specifically, the methods and apparatuses provide continuity of IMS emergency sessions established in 4G access for mobility to 3G/2G access. Generally, a Mobility Management Entity (MME) in the packet switch (PS) domain provides a handover request to a Mobile Switching Center (MSC) Server in the circuit switch (CS) domain. The handover request includes an indication that the call is an emergency call and may include an indication that a Packet Switched Network Induced Location Request (PS-NI-LR) or similar location reporting procedure is required and/or a Gateway Mobile Location Center (GMLC) address. The MSC Server facilitates the handover to the CS domain via the Mg and/or Mw interface.

The method includes steps: (1) urgent call center PSAP and one party in user equipment (UE) in source domain initiates urgency traffic request to the other party; (2) network entity determines whether the condition for triggering service of urgent call continuity is satisfied; if yes, the urgency traffic is anchored to voice call continuity (VCC) application server (AS); and the UE in source domain establishes talking connection with PSAP; (3) based on anchored the urgency traffic, VCC AS implements VCC service. The invention also discloses the system in use for implementing VCC in urgency traffic. Thus, the invention realizes VCC in switching time between source domain and target domain when urgency traffic is carrying on.

The present invention provides a method, device, and system for processing reverse single radio voice call continuity. The method includes, before handing over a voice service from a CS domain network to a PS domain network, preconfiguring, in the PS domain network by a UE, information about resources needed for the voice service handover; and in the process of handing over, by the UE, the voice service from the CS domain network to the PS domain network, establishing a forwarding channel between a first network element of the PS domain and a second network element of the CS domain by using the preconfigured information about resources, where the forwarding channel is configured to forward voice service data between the UE and a peer UE after the UE accesses the PS domain network.

The invention relates to a method and a system for realizing radio voice call continuity (RVCC). The method comprises the following steps that a core network determines and sends single RVCC (SRVCC) ability information shared with user equipment (UE) initiating the radio voice to a current radio access network system, wherein the shared SRVCC ability information shows the SRVCC ability information to different radio access network systems; and after the UE initiates the radio voice, the current radio access network system judges to trigger SRVCC to a target cell when judging that the SRVCC ability information sent by the core network shows support of the SRVCC ability to the target cell corresponding to the inter-system measurement report. By adopting the method and the system, the current radio access network system can correctly trigger the SRVCC flow and avoid handover failure.

A mobile communications method and system for signalling information between a mobile terminal and a network element of a mobile communications network. The mobile terminal transmits information relating to the desirability and/or possibility to support Voice Call Continuity (VCC), to the network element during a communication, and the network element receives the information from the mobile terminal to use the information as a basis for deciding whether or not to anchor a call of the mobile terminal.

A method and system for handover of a video call from a packet switched network to a circuit switched network by a first network entity associated with the packet switched network in a single radio environment is provided. A need to perform a video single radio voice call continuity (vSRVCC) handover from a packet switched network to a circuit switched network is detected during a video call session in the packet switched network. Accordingly, a vSRVCC handover request is transtnitted to a second network entity associated with the circuit switched network for performing the vSRVCC handover of the video call session where the vSRVCC handover request includes vSRVCC capabilities of a user equipment (UE) associated with the video call session.

The embodiments of the present invention provide a method and device for achieving congestion control. The method comprises: determining one or more user equipment required to perform single radio voice call continuity (SRVCC) unloading; and sending an SRVCC unloading message to an evolved Node B (eNodeB) to which the one or more user equipment belongs, so as to enable the evolved Node B to switch the one or more user equipment to a circuit switching (CS) domain from a long term evolution (LTE) domain in the process of triggering the SRVCC switching. In the case of completing the SRVCC switching, the one or more user equipment can be switched to VoCS user equipment from VoLTE user equipment. Thus, the purposes of reducing the load of an LTE cell and guaranteeing the QoS of one or more user equipment can be achieved.

The invention discloses a determination method and device for a voice communication network. The method comprises the steps that a terminal in support of a VoLTE (Voice over Long Term Evolution) obtains a network frequency point at which the terminal currently resides, and the voice indicator information and signal quality information of the network frequency point, when a voice communication demand is detected, wherein the signal quality information may comprise reference signal receiving power and a signal to noise ratio, and the voice indicator information may comprise a call success rate, a call drop rate and an SRVCC (Single Radio Voice Call Continuity) switching rate; and the terminal determines the voice communication network of the terminal based on the voice indicator information and the signal quality information. In this way, the terminal can carry out comprehensive judgment according to the voice indicator information and signal quality information corresponding to the frequency point of a service cell of the terminal, the suitable voice communication network is selected, the voice call quality of the terminal is improved, moreover, SRVCC switching signal processes are reduced, and network loads are reduced.

Wireless devices, networks and methods may operate to have a wireless device cause a base station to trigger voice call continuity handovers responsive to the quality of the cellular radio link in addition to the base station triggering such handovers based on location or mobility. Furthermore, wireless communication devices may also perform monitoring of multiple buffers operating within the wireless communication device and associated with different respective communication layers, in addition to monitoring the quality of the cellular radio link, to perform intelligent dropping/discarding and/or scheduling of packets at the wireless communications device. Any one or more of these features may improve the ability of the wireless communications device to achieve stated Voice over Long Term Evolution (VoLTE) performance benchmarks in the context of the realities of current VoLTE networks.

A method of handling at least a call in handover in a wireless communication system and a communication device using the same are proposed. The wireless communication system includes at least a wireless communication network and a wireless communication device. The method includes the following steps. First, a wireless communication device receives a message for switching at least a packet-switched (PS) call to at least a circuit-switched (CS) call from the wireless communication network. Further, the wireless communication device sets a stream identifier of each of the CS calls to an identifier value. The method enables smooth single radio voice call continuity (SRVCC) handover from the PS call in one wireless communication network to the CS call in another wireless communication network. In addition, the method also enables SRVCC multicall handover from the PS call in one network operation mode to the CS call in another wireless communication network.

The invention provides a method, equipment and system for processing a voice call continuity service. The method comprises the following step that: in a process which is initiated by user equipment (UE) and is used for switching a voice service from a packet-switched (PS) domain network to a circuit-switched (CS) domain network, a mobility management entity (MME) controls to establish a data forwarding channel between a first network element of the PS domain network and a second network element of the CS domain network, wherein the process for switching the voice service from the PS domain network to the CS domain network comprises domain switching and access technology switching; and the data forwarding channel is used for forwarding voice data of the UE before the domain switching is completed. In the embodiment of the invention, the data forwarding channel between the PS domain network and the CS domain network which are used for establishing voice data is controlled before switching and conversion operation of single radio voice call continuity (SRVCC) is completed in the process which is initiated by the UE and is used for switching the voice service from the PS domain network to the CS domain network, so that longer interrupt time delay generated by the domain switching does not influence the length of the voice switching time delay of the SRVCC anymore, and the quality of the voice continuity of the SRVCC is enhanced.

The invention discloses a domain switching method in a voice call continuous service, which comprises the following steps: a VCC application obtains a VDN from a presetting VDN set to distribute the VDN to an IMS dialogue and VCC users are in the active IMS dialogue; VCC users apply the distributed VDN as a called number to make a voice call from a CS domain, requesting the switching of the IMS dialogue to the CS domain, and a call used for making the voice call builds a calling number in request message as the number of users asking for switching; a VMSC triggers a CAMEL service calling process and sends the calling number in the switching request and the VDN to the VCC application; the VCC application determines the IMS dialogue to be switched according to the calling number and the VDN, and distributes corresponding DTF PSI and sends back to the VMSC; the VMSC uses the DTF PSI as the called number and sends a dialogue establishment request to the VCC application; the VCC application determines the IMS dialogue to be switched according to the DTF PSI.

The invention provides a method of fulfilling the call forwarding service, initially, a first user terminal and a second user terminal establish a session, the call forwarding of the second user terminal includes that: the second user terminal transmits a call forwarding service request to a VCCAS; the VCCAS generates a call forwarding message containing the first user terminal and an address of a third user terminal according to the received call forwarding service request, and the message is transmitted to the first user terminal after an application server shielding the address; the first user terminal establishes a session with the third user terminal through the application server according to the received call forwarding message. The invention also provides a system and the VCCAS of fulfilling the call forwarding service. The route can be simplified while the call forwarding service is fulfilled by adopting the invention, thereby reducing the delay and improving the quality of a link.

The invention relates to the technical field of communication, and discloses a switching method, a communication system and related equipment. The switching method comprises the following steps of: receiving a forward relocation request which comprises a service instruction; determining the type of the service instruction; when the service instruction is a single radio voice call continuity (SRVVC) service instruction, sending the forward relocation request to an SRVCC mobile switching center server; and when the service instruction is a CSoPS service instruction which is connected to a data field core network through a circuit switch access network, sending the forward relocation request to a mobile switching center server of a core network circuit switch in a target system. Through the technical scheme provided by the embodiment of the invention, the switching mode needing to be adopted can be accurately determined.

Embodiments of the present invention relates to a method and a device for maintaining call continuity. The method comprises: receiving a first Internet protocol multimedia subsystem (IMS) session switching message sent by a access switching entity, the first IMS session switching message being used for indicating a first session is replaced by a second session during a switching process of single radio voice call continuity (SRVCC), and the first IMS session switching message carrying a session identifier of the first session; searching for the first session according to the session identifier of the first session and acquiring a session description protocol (SDP) message corresponding to a remote media path of the first session; sending a second IMS session switching message to a service centralization and continuity application server (SCCAS), the second IMS session switching message carrying a SDP message corresponding to the remote media path of the first session. In the embodiments of the invention, the continuity of maintaining user calls during the SRVCC process is realized.

The embodiment of the invention provides a single radio voice call continuity (SRVCC) transfer method, equipment and system. According to the method, P-CSCF equipment obtains a session transfer number for SRVCC (STN-SR), the STN-SR is sent to PCRF equipment so that the PCRF equipment can send the STN-SR to an MME for storage, and therefore by means of the concise method, the situation that E-CSCF/EATF equipment chosen by I-CSCF is consistent with E-CSCF/EATF equipment chosen by call establishment is guaranteed.