公开(公告)号：US11638150B1

公开(公告)日：2023-04-25

申请号：US17249088

申请日：2021-02-19

Applicant: Sprint Spectrum L.P.

Inventor： Anubhav Visen ,  Rajil Malhotra

IPC: H04W12/08 ,  H04W12/088 ,  H04L69/326 ,  H04L9/40 ,  H04L67/148

Abstract: A method and system to facilitate session continuity where a user-plane function (UPF) serves user-equipment devices (UEs) and communicates with a transport network by default through a first firewall. As each of various ones of the UEs establishes a respective TCP session via the first firewall, the UPF determines if the UE is likely to engage in latency-sensitive communication, such as if the UE is a Ultra-Reliable Low-Latency Communication (URLLC) device and if so causes the first firewall to record the UE's TCP session 5-tuple to a centralized data storage. Thereafter when the UPF switches to use a second firewall instead of the first firewall (e.g., because the first firewall goes out of service), the UPF causes the second firewall to get from the centralized data store the TCP session 5-tuple of each such UE, for access-control use by the second firewall, to help provide session continuity.