公开(公告)号：US11848993B2

公开(公告)日：2023-12-19

申请号：US17507124

申请日：2021-10-21

Applicant: Wistron Corp.

Inventor： Jian Wah Liong

IPC: H04L67/14

CPC classification number: H04L67/14

Abstract: A method of signaling enhancement for an always-on PDU session is provided. A User Equipment (UE) transmits a Non-Access Stratum (NAS) request message to a mobile communication network. The NAS request message includes an Always-on PDU Session Requested (APSR) Information Element (IE). The UE receives a NAS response message including an Always-on PDU Session Indication (APSI) IE from the mobile communication network. The APSI IE includes a time length indicator. In response to the APSI IE indicating that the always-on PDU session is not allowed, the UE starts a timer based on the time length indicator and retransmits the NAS request message to the mobile communication network when the timer expires.