Method for keeping active state of smart card until re-entering field, and smart card

A smart card, comprising:

• a computer readable storage medium for storing a program;
• and
• a processor, wherein the processor is configured to execute the program to execute the following modules:
• a sending module, configured to send a waiting time extension instruction to an electronic device when the smart card is in an electromagnetic field of the electronic device and in an active state, the waiting time extension instruction at least comprising a preset waiting duration;
• a receiving module, configured to trigger a timer to start timing after receiving a reply returned by the electronic device in response to the waiting time extension instruction;
• a timer, configured to start timing after being triggered by the receiving module, a timing duration being the preset waiting duration;
• a control module, configured to determine whether the timer times out after detecting that smart card leaves the field, and keep a current state of the smart card as the active state when the timer does not time out, wherein the smart card is powered by a built-in power supply of the smart card when the smart card leaves the field, and further configured to determine whether the timer times out after detecting that smart card re-enters the field, and keep the current state of the smart card as the active state when the timer does not time out.

A smart card, comprising:

• one or more processors;
• a memory;
• and
• one or more programs;
• wherein the one or more programs are stored in the memory, and when executed by the one or more processors, perform following operations:
• sending a waiting time extension instruction to an electronic device when monitoring that the smart card is in an electromagnetic field of the electronic device and in an active state, the waiting time extension instruction comprising at least a preset waiting duration;
• starting a timer after the smart card receives a reply returned by the electronic device in response to the waiting time extension instruction, a timing duration of the timer being the preset waiting duration;
• detecting that the smart card leaves the field, determining whether the timer times out, and keeping a current state of the smart card as the active state when the timer does not time out, wherein the smart card is powered by a built-in power supply of the smart card when the smart card leaves the field;
• and
• detecting that the smart card re-enters the field, determining whether the timer times out, and keeping the current state of the smart card as the active state when the timer does not time out.