Data Connection Establishment Method and Terminal Device

A data connection establishment method implemented by an application processor (AP ), wherein the method comprises:

• receiving a switch-on instruction;
• sending a network searching instruction to a communications processor (CP), wherein the network searching instruction instructs the CP to search for a network;
• receiving subscriber identification module (SIM) card status change information and network status change information from the CP;
• and
• sending a data connection establishment instruction to the CP based on the SIM card status change information and the network status change information, wherein the data connection establishment instruction instructs the CP to establish a data connection to a found network.

A terminal device, comprising:

• a communications bus:
• a communication processor (CP);
• and
• an application processor (AP) coupled to the CP using the communications bus and configured to:
• receive a switch-on instruction;
• and
• send a network searching instruction to the CP,
• wherein the CP is configured to search for a network based on the network searching instruction,
• wherein the AP is further configured to:
• receive subscriber identification module (SIM) card status change information and network status change information from the CP;
• and
• send a data connection establishment instruction to the CP based on the SIM card status change information and the network status change information, and
• wherein the CP is configured to establish a data connection to a found network.

A terminal device, comprising:

• a communications bus;
• a communications processor (CP);
• and
• an application processor (AP) coupled to the CP using the communications bus and configured to:
• receive a switch-on instruction;
• obtain a mobile country code (MCC) and a mobile network code (MNC) of a subscriber identity module (SIM) card from information about the SIM card;
• obtain, from the information about the SIM card, a serial number, a local phone number, a voice mailbox identifier, a call transfer identifier, and operator name information of the SIM card;
• create, in parallel with the obtaining, an access point name (APN) based on the MCC and the MNC;
• and
• send a data connection establishment instruction to the CP such that the CP establishes a data connection to a found network based on the APN.