| CPC H04W 74/0841 (2013.01) [H04W 72/0446 (2013.01); H04W 74/0866 (2013.01); H04W 76/20 (2018.02); H04W 76/30 (2018.02)] | 17 Claims |

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1. A method for detecting a terminal device in an idle state, wherein the method is applied to the terminal device, and the method comprises:
receiving a first system message, wherein the first system message comprises a first field, and the first field is used to indicate the terminal device in the idle state to periodically initiate random access; and
sending, by the terminal device in the idle state, a random access request to a network device based on the first field to enter a connected state, wherein the sending, by the terminal device in the idle state, a random access request to a network device based on the first field to enter a connected state comprises sending, by the terminal device in the idle state, the random access request to the network device periodically with a period of a first time period based on a first time period identifier, wherein the first field comprises the first time period identifier.
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