摘要:
According to an embodiment of the present invention there is provided a method of enabling Single Radio Voice Call Continuity, SRVCC, access transfer for an emergency call back IP Multimedia Subsystem, IMS, session to a user equipment, UE. The method comprises including a session continuity function in a signalling path of a request for establishment of a call back session intended for the UE, and if access transfer of the call back session from a packet switched access to a circuit switched access is required, implementing SRVCC access transfer of the call back session using the session continuity function.
摘要:
A method of enabling the management of handovers of voice calls from a Packet Switched, PS, access to a Circuit Switched, CS, access where the voice calls are established using an IP Multimedia Subsystem, IMS, network. The method comprises performing a first IMS registration of a user via said PS access including setting for the user in a Home Subscriber Server, HSS, of the user's home network, an identifier of a first access transfer control function, which access transfer control function is responsible for anchoring user media sessions in an access transfer gateway of a serving network, and notifying a mobility function within said service network of the set identifier. A second or further IMS registration of the same user is then performed via said PS access, it being determined that said first IMS registration exists. As a consequence, the setting of an identifier of a second or further access transfer control function in the HSS for the user is prevented, while either the setting of the identifier of the first access transfer control function is maintained, or is replaced with an identifier of a service centralization and continuity application server. The mobility function is notified of any change to the set identifier. In the event of a requirement to handover an ongoing voice call associated with said second or further IMS registration from said PS to said CS access, the identifier currently set in the HSS and identified to the mobility function is used to manage the handover.
摘要:
According to a first embodiment of the present invention there is provided a method of operating a node of a communications network that is configured to provide an IP Multimedia Subsystem Access Transfer Control Function. The method comprises storing information regarding IMS Service Continuity features that are supported by Mobile Switching Center servers within the network. Upon receipt of a message requesting IMS registration of a user equipment using the information to determine the IMS Service Continuity features that may be available to the user equipment, and, for any IMS Service Continuity features that may be available, including an indication that the IMS Service Continuity feature may be available in the message, and forwarding the message towards a Service Centralization and Continuity Application Server.
摘要:
A method of enabling the management of handovers of voice calls from a Packet Switched, PS, access to a Circuit Switched, CS, access where the voice calls are established using an IP Multimedia Subsystem, IMS, network. The method comprises performing a first IMS registration of a user via said PS access including setting for the user in a Home Subscriber Server, HSS, of the user's home network, an identifier of a first access transfer control function, which access transfer control function is responsible for anchoring user media sessions in an access transfer gateway of a serving network, and notifying a mobility function within said service network of the set identifier. A second or further IMS registration of the same user is then performed via said PS access, it being determined that said first IMS registration exists. As a consequence, the setting of an identifier of a second or further access transfer control function in the HSS for the user is prevented, whilst either the setting of the identifier of the first access transfer control function is maintained, or is replaced with an identifier of a service centralisation and continuity application server. The mobility function is notified of any change to the set identifier. In the event of a requirement to handover an ongoing voice call associated with said second or further IMS registration from said PS to said CS access, the identifier currently set in the HSS and identified to the mobility function is used to manage the handover.
摘要:
According to a first embodiment of the present invention there is provided a method of operating a node of a communications network that is configured to provide an IP Multimedia Subsystem Access Transfer Control Function. The method comprises storing information regarding IMS Service Continuity features that are supported by Mobile Switching Center servers within the network. Upon receipt of a message requesting IMS registration of a user equipment using the information to determine the IMS Service Continuity features that may be available to the user equipment, and, for any IMS Service Continuity features that may be available, including an indication that the IMS Service Continuity feature may be available in the message, and forwarding the message towards a Service Centralization and Continuity Application Server.
摘要:
The invention relates to a method for establishing a push-to-talk-(Ptt) communication link between two Ptt devices (1,2), in which the data of different types, such as voice data (Sp), audio data (A), video data (V) etc., is transmitted between the Ptt devices (1,2). The first Ptt device (1) transmits a Ptt link request, and subsequently a communication link is established for at least one selection of said different types of data via a communication channel (F1, NF) according to a communication protocol. According to the invention, the Ptt link request contains priority information which enables the data types to be allocated a transmission priority, and the communication protocol only authorizes the communication channel (F1, NF) to be established if the second Ptt-device (2) is available for the data type or for the data types having the highest transmission priority. The transmission of one data type, which has a lower transmission priority, by means of said communication channel (F1, NF) is only authorized if the second Ptt-device (2) is available for said data type, and the second Ptt-device (2) is also available for all data types with a higher transmission priority.
摘要:
An improved method for re-activating a terminated group session. A server responsible for controlling the connection stores associated participant information identifying clients that participated or were intended to participate the connection. This associated participant information is provided to the client when a negative response to the request for re-joining the connection needs to be given. The client can then re-activate the communication by re-initing the connection. The roles and responsibilities of the continued connection are more consistent and still, the task of storing the information for the continued connection takes place in the element where it is most appropriately done.
摘要:
A network can handle access attempts by a mix of user equipments (UEs) that do and do not support multiple packet data network connections and do and do not support Internet Protocol version 6 (IPv6) and access attempts from networks that do and do not support multiple PDN connections. A method of operating a Trusted Non-3GPP Access network with a 3GPP network involves an authentication, authorization, and accounting (AAA) proxy in the Trusted Non-3GPP Access network and a UE that supports multiple PDN connections, with the AAA proxy sending an indication to the UE that the network supports multiple PDN connections.
摘要:
During a registration procedure by a User Equipment (UE) via a Proxy Call Session Control Function (P-CSCF) node and a Serving Call Session Control Function (S-CSCF) node, the S-CSCF node provides a policy indicator in a response message to a register request message. The policy indicator enables subsequent operation of the node to be controlled according to whether or not a registered UE has an associated policy. As such, delays (such as delays associated with retrieving an associated policy) are only experienced by UEs that have previously been determined as having such an associated policy, rather than all UEs being affected in the same way.
摘要:
Techniques for managing multiple ICS sessions in an IMS network are described. In one method, a MSC server detects that a user terminal has been transferred from a first access network to a second access network and, in response, sends a message to an SCC AS, the message indicating transfer of the user terminal. The MSC server receives, in response, one or more requests for MSC server-assisted mid-call feature services for the user terminal, and assigns transaction identifiers to one or more sessions held for the user terminal or to one or more conference participants corresponding to the user terminal. Corresponding techniques carried out at an SCC AS are also described.