US 12,069,529 B2
Method and apparatus for providing network triggered mobility between a stand-alone non-public network and a public land mobile network
Gyorgy Wolfner, Budapest (HU); Devaki Chandramouli, Plano, TX (US); and Bruno Landais, Pleumeur-Bodou (FR)
Assigned to Nokia Technologies Oy, Espoo (FI)
Appl. No. 17/618,407
Filed by Nokia Technologies Oy, Espoo (FI)
PCT Filed Jun. 14, 2019, PCT No. PCT/US2019/037291
§ 371(c)(1), (2) Date Dec. 10, 2021,
PCT Pub. No. WO2020/251588, PCT Pub. Date Dec. 17, 2020.
Prior Publication US 2022/0240147 A1, Jul. 28, 2022
Int. Cl. H04W 36/18 (2009.01); H04W 36/14 (2009.01); H04W 36/30 (2009.01)
CPC H04W 36/18 (2013.01) [H04W 36/14 (2013.01); H04W 36/30 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
causing guidance information to be transmitted to user equipment, wherein the guidance information identifies cells that are at an edge of a first stand-alone non-public network;
based on comparing, by a user equipment, guidance information with a first tracking area code of a first cell of the first stand-alone non-public network or with a first cell identifier of the first cell of the first stand-alone non-public network, determining the user equipment with a first protocol data unit session established in the first stand-alone non-public network will be leaving a coverage area of the first stand-alone non-public network;
after determining that the user equipment with the first protocol data unit session established in the first stand-alone non-public network will be leaving the coverage area of the first stand-alone non-public network, determining that the user equipment accesses cells that are at an edge of the first stand-alone non-public network;
based on determining that the user equipment accesses the cells that are at an edge of the first stand-alone non-public network, causing a request message to be transmitted to the user equipment, wherein the request message comprises a request to initiate a second protocol data unit session establishment procedure towards a public land mobile network;
causing the user equipment to establish the second protocol data unit session with an internet protocol anchor function of a user plane function in the public land mobile network via the first stand-alone non-public network radio access network or via the public land mobile network radio access network, wherein the second protocol data unit session is established prior to release of the first protocol data unit session;
causing release of the first protocol data unit session established in the first stand-alone non-public network in response to the first protocol data unit session established in the first stand-alone non-public network being inactive for at least a threshold inactivity period;
transmitting a signal to the user equipment to establish a third protocol unit session via a second stand-alone non-public network identified by a certain network identifier (NID);
causing the user equipment to establish a third protocol data unit session with an internet protocol anchor function of a second user plane function in a second stand-alone non-public network via the public land mobile network radio access network or via second stand-alone non-public network radio access network, wherein the third protocol data unit session is established prior to release of the second protocol data unit session; and
after determining that the user equipment no longer access the cells that are at the edge of the public land mobile network, causing the user equipment to initiate a release of the second protocol data unit session established towards the public land mobile network.