METHOD FOR USER EQUIPMENT REALIZING HANDOFF ACROSS ACCESS NETWORKS IN ACTIVE STATE

摘要

A method for user equipment realizing handoff across access networks in active state includes: during the process for a user equipment in active state handing over from an Evolved Packet System to a Universal Mobile Telecommunication System or a Global System for Mobile communication system, an Evolved Universal Mobile Telecommunication System Radio Access Network tells the user equipment whether this handoff is a handoff due to an incoming call of circuit domain before telling the user equipment to hand over or when telling the user equipment to hand over; the user equipment will not send a paging response message to Mobile Switching Center / Visitor Location Register after handing over to the Universal Mobile Telecommunication System or the Global System for Mobile communication system except that this handoff is a handoff due to an incoming call of circuit domain. By using the present invention, it will help to the successful establishment of domain call after handoff, and it can avoid the waste of circuit network resource.