Method and device for network initiated packet data unit, PDU, session establishment in a telecommunication network

A method of establishing a Packet Data Unit (PDU) session between a registering User Equipment (UE) and a data network identified by a Data Network Name (DNN) in a telecommunication network, the telecommunication network comprising an Access and Mobility Function (AMF) and a Policy Control Function (PCF), the method comprising:

• initiating, by the UE, a registration request for registering the UE in the telecommunication network;
• the UE receiving, from the AMF of the telecommunication network and in response to the registration request, Route Selection Policies (URSP) data comprising:
• one or more DNNs to which PDU sessions are to be established by the UE;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs;
• and
• establishing, by the UE, at least one PDU session with the at least one DNN of the one or more DNNs.

A method of establishing a Packet Data Unit (PDU) session between a registering User Equipment (UE) and a data network identified by a Data Network Name (DNN) in a telecommunication network, the telecommunication network comprising an Access and Mobility Function (AMF) and a Policy Control Function (PCF), the method comprising:

• receiving, by the PCF, a request from an AMF for PDU session establishment information for the UE;
• and
• transmitting, by the PCF and to the AMF, PDU session establishment information including UE Route Selection Policies (URSP) data, the USRP data comprising:
• one or more DNNs to which PDU sessions are to be established by the UE;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs.

An Access and Mobility Function (AMF) arranged for initiating a Packet Data Unit (PDU) session between a registering User Equipment (UE) and a data network identified by a Data Network Name (DNN) in a telecommunication network, the AMF comprising:

• processing circuitry;
• and
• memory comprising instructions executable by the processing circuitry whereby the AMF is operative to:
• receive a registration request initiated by the UE for registering the UE in the telecommunication network;
• retrieve, from a Policy Control Function (PCF) in the telecommunication network, PDU Session establishment information, wherein the retrieving is in response to receiving the registration request,
• receive, from the PCF, PDU session establishment information including UE Route Selection Policies (URSP) data, the USRP data comprising:
• a listing of one or more DNNs to which PDU sessions are to established by the UE;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs;
• and
• control the UE to initiate the PDU session to the at least one DNN immediately after registration, wherein to control the UE to initiate the PDU session, the AMF is further operative to transmit the USRP data received from the PCF to the UE.

A User Equipment (UE) arranged for establishing a Packet Data Unit (PDU) session in a telecommunication network between the UE and a data network identified by a Data Network Name (DNN), the UE comprising:

• processing circuitry;
• memory containing instructions executable by the processing circuitry whereby the UE is operative to:
• initiate a registration request for registering the UE in the telecommunication network;
• receive, from an Access and Mobility Function (AM F) in the telecommunication network, UE Route Selection Policies (URSP) data comprising:
• a listing of one or more DNNs with which the UE is to establish a PDU session;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs;
• and
• establish at least one PDU session between the UE and at least one DNN of the listing of one or more DNNs.

A Policy and Control Function (PCF), arranged for initiating a Packet Data Unit (PDU) session between a registering User Equipment (UE) and a data network identified by a Data Network Name (DNN), the PCF comprising:

• processing circuitry;
• memory containing instructions executable by the processing circuitry whereby the PCF is operative to:
• receive a request, from an Access and Mobility Function (AMF) in the telecommunication network, for PDU session establishment information for the UE;
• and
• transmit, to the AMF, PDU session establishment information including UE Route Selection Policies (URSP) data, the USRP data comprising:
• one or more DNNs to which PDU sessions are to be established by the UE;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs.

A non-transitory computer readable recording medium storing a computer program product for establishing a Packet Data Unit (PDU) session between a registering User Equipment (UE) and a data network identified by a Data Network Name (DNN) in a telecommunication network, the telecommunication network comprising an Access and Mobility Function (AMF) and a Policy Control Function (PCF), the computer program product comprising software instructions which, when run on processing circuitry of the AMF, causes the AMF to:

• receive a registration request initiated by a UE for registering the UE in the telecommunication network;
• retrieve, from the PCF, PDU session establishment information, wherein the retrieving is triggered by the receiving the registration request;
• receive, from the PCF, PDU session establishment information including UE Route Selection Policies (URSP) data, the USRP data comprising:
• one or more DNNs to which PDU sessions are to be established by the UE;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs;
• and
• control the UE to initiate the PDU session to the at least one DNN immediately after registration, wherein to control the UE to initiate the PDU session, the software instructions executing on the processing circuitry causes the AMF to transmit, to the UE, the USRP data received from the PCF.

A non-transitory computer readable recording medium storing a computer program product for establishing a Packet Data Unit (PDU) session between a registering User Equipment (UE) and a data network identified by a Data Network Name (DNN) in a telecommunication network, the telecommunication network comprising an Access and Mobility Function (AMF) and a Policy Control Function (PCF), the computer program product comprising software instructions which, when run on processing circuitry of the UE, causes the UE to:

• initiate a registration request for registering the UE in the telecommunication network;
• receive, from the AMF and in response to the registration request, UE Route Selection Policies (URSP) data comprising:
• a listing of one or more DNNs with which the UE is to establish a PDU session;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs;
• and
• establish at least one PDU session with at least one DNN of the one or more DNNs.

A non-transitory computer readable recording medium storing a computer program product for establishing a Packet Data Unit (PDU) session between a registering User Equipment (UE) and a data network identified by a Data Network Name (DNN) in a telecommunication network, the telecommunication network comprising an Access and Mobility Function (AMF) and a Policy Control Function (PCF), the computer program product comprising software instructions which, when run on processing circuitry of the PCF, causes the PCF to:

• receive a request from an AMF for PDU session establishment information for the UE;
• and
• transmit, to the AMF, PDU session establishment information including UE Route Selection Policies (URSP) data, the USRP data comprising:
• one or more DNNs to which PDU sessions are to be established by the UE;
• a per-DNN indicator for at least one DNN indicating that the UE is required to initiate a PDU session to the at least one DNN immediately after registration;
• and
• PDU session type information specifying a type of PDU session to be established with a respective DNN of the one or more DNNs.