A flexible heating mat is provided. The method includes: receiving an Internet Protocol Connectivity Access Network session setup message and a gateway control session message; and associating an IP-CAN session with a gateway control session according to a temporary identity in the IP-CAN session setup message and the temporary ID in the gateway control session message. The probability of DCI misdetection may be reduced, and further the accuracy of uplink and downlink data on a mobile terminal and system stability may be ensured. The magnet can be partially positioned within at least one recess in the base and the magnet can be fixed in the recess or rotate within the recess.