US 12,477,600 B2
Tunnel failure signaling 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 Jul. 10, 2024, as Appl. No. 18/768,094.
Application 18/768,094 is a continuation of application No. 17/962,032, filed on Oct. 7, 2022, granted, now 12,127,276.
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 2024/0365410 A1, Oct. 31, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 76/12 (2018.01); H04L 12/46 (2006.01)
CPC H04W 76/12 (2018.02) [H04L 12/4633 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a user plane function (UPF) from a control plane function (CPF), a request to establish a layer 2 tunneling protocol (L2TP) tunnel between the UPF and an L2TP network server (LNS) for a first protocol data unit (PDU) session of a wireless device, wherein the UPF supports an L2TP service;
determining, by the UPF, a failure of the L2TP tunnel establishment; and
sending, by the UPF to the CPF and based on the determining, a message comprising a tunnel failure cause for the L2TP tunnel indicating:
an L2TP tunnel failure of the L2TP tunnel; and
that an L2TP access concentrator (LAC) and LNS pair connection between the UPF and the LNS does not exist;
wherein the UPF comprises the LAC.