Patent ID: 9026132
Filing Date: 2015-05-05
Classification: H04W

Abstract:
1. A method, comprising: accepting at a generic access network controller a registration request from a mobile station via an Internet protocol security tunnel connecting the generic access network controller to the mobile station via an Internet protocol network, the generic access network controller to communicatively couple the mobile station to a public land mobile network via the Internet protocol network; determining a first time zone offset from a first time by looking up in a database an outer Internet protocol address of the Internet protocol security tunnel associated with an inner Internet protocol layer used by the mobile station to be addressed by the generic access network controller, the first time zone offset corresponding to a location of the mobile station; encoding in a generic access network information element the first time zone offset from a first time; and transmitting the generic access network information element in at least one of a GA-RC REGISTER ACCEPT message or a GA-RC REGISTER UPDATE DOWNLINK message to the mobile station; at the mobile station, receiving a second time zone offset from the first time sent by a second public land mobile network; at the mobile station, automatically selecting the first time zone offset instead of the second time zone offset while connected to the generic access network controller; and at the mobile station, setting a local time zone of the mobile station using the selected one of the first time zone offset or the second time zone offset.