Method for determining paging reason

A method for determining a paging cause, performed by a target base station covering a region where a second SIM card in an inactive state on a multi-card terminal is presently in, comprising:

• paging the second SIM card using a first paging signaling;
• receiving a paging cause request sent by the second SIM card;
• determining a target paging cause for paging the second SIM card, wherein the paging cause request requests the target paging cause for paging the second SIM card;
• and
• sending a second paging signaling comprising the target paging cause to the second SIM card;
• wherein receiving the paging cause request sent by the second SIM card comprises one of:
• receiving the paging cause request from the second SIM using a first signaling, wherein the first signaling is a radio resource control (RRC) signaling, and the first signaling comprises an RRCResumeRequest signaling or an RRCResumeComplete signaling;
• or
• receiving a reserved preamble as the paging cause request from the second SIM card;
• wherein in a case that the target base station is different from an anchor base station corresponding to the second SIM card, and the target base station acquires the target paging cause from the anchor base station, the method further comprises:
• sending the paging cause request to the anchor base station using a second signaling, wherein the second signaling comprises a RETRIEVE UE CONTEXT REQUEST signaling.

A method for determining a paging cause, performed by an anchor base station corresponding to a second SIM card in an inactive state on a multi-card terminal, comprising:

• receiving a paging cause request, wherein the paging cause request requests a target paging cause for paging the second SIM card;
• and
• sending the target paging cause after determining the target paging cause;
• wherein receiving the paging cause request comprises:
• receiving the paging cause request sent by the second SIM card, wherein the second SIM card is within a coverage range of the anchor base station;
• wherein receiving the paging cause request sent by the second SIM card comprises one of:
• receiving the paging cause request from the second SIM using a first signaling,
• wherein the first signaling is a radio resource control (RRC) signaling, and the first signaling comprises an RRCResumeRequest signaling or an RRCResumeComplete signaling;
• or
• receiving a reserved preamble as the paging cause request from the second SIM card;
• wherein in a case that the target paging cause is acquired by the anchor base station from a core network device, the method further comprises:
• sending the paging cause request to the core network device using a third signaling, wherein the third signaling is an RRC signaling, and the third signaling comprises an RRC inactive transition report signaling or an RRC configuration update signaling.