US 12,010,564 B2
Selective handover or redirection based on interface availability
Anna Sillanpaa, Nozay (FR); and Philippe Godin, Nozay (FR)
Assigned to NOKIA SOLUTIONS AND NETWORKS OY, Espoo (FI)
Filed by NOKIA SOLUTIONS AND NETWORKS OY, Espoo (FI)
Filed on Aug. 6, 2021, as Appl. No. 17/396,156.
Application 17/396,156 is a division of application No. 16/448,524, filed on Jun. 21, 2019, granted, now 11,102,683.
Claims priority of application No. PCT/EP2018/066838 (WO), filed on Jun. 22, 2018.
Prior Publication US 2021/0368398 A1, Nov. 25, 2021
Int. Cl. H04W 4/00 (2018.01); H04W 36/00 (2009.01); H04W 36/32 (2009.01); H04W 60/04 (2009.01); H04W 84/04 (2009.01)
CPC H04W 36/0022 (2013.01) [H04W 36/0033 (2013.01); H04W 36/0072 (2013.01); H04W 36/32 (2013.01); H04W 60/04 (2013.01); H04W 84/042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
accessing, at a first radio access network (RAN) from a database, information indicating an availability status of an interface between an access and mobility management function (AMF) in a first wireless communication system and a mobility management entity (MME) in a second wireless communication system, wherein the information accessed by the first RAN from the database comprises availability status information associated with a plurality of interfaces between the MME and a plurality of AMFs;
receiving, at the first RAN from a user equipment (UE), a trigger for a handover of the UE between the first RAN and a second RAN; and
in response to receiving the trigger from the UE at the first RAN, selectively performing the handover via the interface or transmitting a release over an air interface to the UE to trigger a redirect via a network element shared by the first and second wireless communication systems based on the availability status.