Patent ID: 9253747
Filing Date: 2016-02-02
CPC Classification: H04W

Claim Text:
1. A method comprising: a first network that is serving a user equipment device (UE) releasing the UE from being served by the first network, redirecting the UE to transition from being served by the first network to being served by a second network, and storing information indicative of the releasing and redirecting of the UE; thereafter, the first network detecting that the UE has returned to be served by the first network; and responsive to detecting the return of the UE: (i) the first network referring to the stored information to determine that the first network previously released and redirected the UE, and (ii) based on the previous releasing and redirecting of the UE, the first network initiating a pre-registration of the UE with the second network to inform the second network that the UE is now reachable via the first network.