FIELD: communications.
SUBSTANCE: invention is proposed to provide intersystem handover. For this, the UE user device receives the indication information during the first session establishment process. It is determined whether a first session exists in the first communication system, where it is possible to transfer the first session from the first communication system to the second communication system. The first message is transmitted by the UE to the first main network device of the second communication system if the presence of the first session is determined, where the first message is used to establish a second session in the second communication system, and the second session corresponds to the first session.
EFFECT: intersystem handover.
29 cl, 25 dwg
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