PAGING METHOD AND APPARATUS FOR CALLED TERMINAL

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PAGING METHOD AND APPARATUS FOR CALLED TERMINAL

This abstract first appeared for US patent application 18570009 titled 'PAGING METHOD AND APPARATUS FOR CALLED TERMINAL

Original Abstract Submitted

A called terminal device camping on a 5th generation (5G) standalone (SA) network receives a paging message. The called terminal device may start a first timer when detecting that a data radio bearer (DRB) for transmitting Internet Protocol (IP) multimedia subsystem (IMS) data is established, and detect whether IMS data is received in an on period of the first timer. If the first timer expires and the called terminal device does not receive INVITE or other IMS data, it is considered that the network is abnormal and therefore the IMS data (such as INVITE) cannot be received. In this case, the called terminal device may actively fall back to long term evolution (LTE) to receive an incoming call. In this way, the called terminal device can receive an INVITE message or a paging message in an IMS domain on the LTE, thereby avoiding a failed incoming call.