Communication terminal device, communication system and communication method

A communication terminal device, comprising:

• a first communication chip detached from a core network and emitting a notification when a network traffic greater than a threshold, an Internet telephone packet or a paging being received;
• a second communication chip;
• and
• a switching unit, in response to the notification issued by the first communication chip, enabling the second communication chip to be attached to the core network to allow the Internet telephone packet or the network traffic to be transmitted from the core network to the second communication chip.

A communication method, comprising:

• after a core network receiving an Internet telephone packet or a network traffic greater than a threshold, the core network transferring the Internet telephone packet or the network traffic or transmitting a paging to a first communication chip of a communication terminal device;
• the first communication chip being detached from the core network;
• switching from the first communication chip to a second communication chip;
• the second communication chip being attached to the core network;
• and
• transmitting the Internet telephone packet or the network traffic from the core network to the second communication chip.