US 12,127,276 B2
Tunnel failure procedures
Weihua Qiao, Herndon, VA (US); Esmael Hejazi Dinan, McLean, VA (US); Kyungmin Park, Vienna, VA (US); Jinsook Ryu, Oakton, VA (US); Peyman Talebi Fard, Vienna, VA (US); and Taehun Kim, Fairfax, VA (US)
Assigned to Ofinno, LLC, Reston, VA (US)
Filed by Ofinno, LLC, Reston, VA (US)
Filed on Oct. 7, 2022, as Appl. No. 17/962,032.
Application 17/962,032 is a continuation of application No. PCT/US2022/012074, filed on Jan. 12, 2022.
Claims priority of provisional application 63/136,522, filed on Jan. 12, 2021.
Prior Publication US 2023/0036645 A1, Feb. 2, 2023
Int. Cl. H04W 76/12 (2018.01); H04L 12/46 (2006.01)
CPC H04W 76/12 (2018.02) [H04L 12/4633 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method comprising:
determining, by a session management function (SMF) and based on a local configuration, a layer 2 tunneling protocol (L2TP) tunnel associated with a first protocol data unit (PDU) session of a wireless device;
selecting, by the SMF, a first user plane function (UPF) based on the first UPF supporting a L2TP service;
sending, by the SMF to the first UPF that supports the L2TP service, a request to establish the L2TP tunnel between the UPF and a L2TP network server (LNS) for the first protocol data unit (PDU) session; and
receiving, by the SMF from the first UPF, a message responding to the request to establish the L2TP tunnel, the message indicating a failure of the L2TP tunnel, the message comprising a tunnel failure cause information element indicating:
a L2TP tunnel failure of the L2TP tunnel; and
that a L2TP access concentrator (LAC) and LNS pair connection between the UPF and the LNS does not exist, wherein the UPF comprises the LAC.