Registration with radio access network in response to registration with call server

摘要

A method and apparatus in which (i) a user equipment device registers with a first radio access network (RAN) that provides connectivity with a transport network, (ii) once registered with the first RAN, the device then registers via the first RAN and transport network with a call server, and (iii) in response to the device registering with the call server, but before the device then engages in a call served by the call server, the device registers via the first RAN with a second RAN. The method may thereby help to expedite later handover of a call served by the call server from being via the first RAN to being via the second RAN. Further, by the second RAN registration being conducted in response to registration of the device with the call server, the method may help to ensure usefulness of the registration of the device with the second RAN.

主权项

1. A method comprising:
registering by a user equipment device (UE) with a first radio access network (RAN) that provides connectivity with a transport network; once the UE is thereby registered with the first RAN, registering by the UE, via the first RAN and transport network, with a call server, wherein the call server is a Voice over Internet Protocol (VoIP) call server; and in response to registering by the UE with the call server, but before the UE then engages in any calls served by the call server, registering by the UE, via the first RAN, with a second RAN.