Patent ID: 9516619
Filing Date: 2016-12-06
CPC Classification: H04W,Y02D

Claim Text:
1. A mobile communication system comprising: a mobile station; a first communication system which comprises a first network node; a second communication system which comprises a second network node; wherein the mobile communication system supports a procedure for the mobile station connected to the first communication system to use the second communication system, wherein the second network node, in response to a received voice call, transmits a request message to the first network node, the first network node transmits a demand for a paging message to a first base station, connected to the first network node, after the request message is received from the second network node, wherein the demand for the paging message is intended for the mobile station, the mobile station transmits a message which responds to the paging message to the second network node after the paging message is received, a connection between the second communication system and the mobile station is established and the message which responds to the paging message is received by the second network node, without the mobile station requesting a location registration with the second communication system a first radio technology of the first communication system is different from a second radio technology of the second communication system, and the location registration is a unified location registration for the procedure and comprises a location registration for the first communication system and a location registration for the second communication system.