Method for establishing a bidirectional NAS signalization channel between a secure element cooperating with a terminal and a distant platform
The invention proposes a method for establishing a bidirectional NAS signalization channel between a secure element cooperating with a terminal and a distant platform through a Network Exposure Function, upon request of either the secure element or the distant platform. The method includes an exchange of containers of data between the distant platform and the secure element through the Network Exposure Function.
1 . Method for establishing a bidirectional NAS (Non-Access Stratum) signalization channel between a secure element cooperating with a terminal and a distant platform through a Network Exposure Function, upon request of either said secure element or said distant platform, said method comprising:
exchanging by a computer containers of data between said distant platform and said secure element through said Network Exposure Function, wherein the exchange comprises the reception of an envelope, and
opening by the secure element a local bearer independent protocol (BIP) session between device and said secure element with a dedicated end point defined through an IARI mechanism based on the envelope,
wherein opening the local BIP session comprises,
sending an envelope with an IARI=“UICC access to NAS” message from the user equipment to the secure element;
replying by the secure element, with a message with a “OPEN CHANNEL (Open Channel for IMS, IARI=“UICC access to NAS”, buffer size)” message;
replying by the user equipment, with a “TERMINAL RESPONSE (channel Id)”;
replying, by the user equipment, with a “ENVELOPE (event download: data available)”;
sending, by the secure element, a “RECEIVE DATA (Open Channel for IMS, IARI=“UICC access to NAS”, buffer size)” message to the user equipment;
sending, by the secure element, a “CLOSE CHANNEL (channel Id)»request to the user equipment; and
responding, by the user equipment, with a “TERMINAL RESPONSE (OK)” message.
2 . Method according to claim 1 wherein said distant platform is an Over the Air (OTA) platform.
3 . Method according to claim 1 wherein said distant platform is a Remote SIM Provisioning (RSP) platform as defined by Global System for Mobile Communications (GSMA).
4 . Method according to claim 1 wherein said containers are exchanged over Bearer Independent Protocol (BIP) (Bearer Independent Protocol) between said secure element and said terminal.
5 . Method according to claim 1 wherein said containers are exchanged between said secure element and said terminal through a file written in said secure element.