Abstract: A wireless communication terminal roaming from a current access point (AP) to a destination AP within a plurality of APs includes various functional modules. The wireless communication terminal detects a current service quality parameter of each of the plurality of APs, a roaming frequency, and a packet retransmission rate of the wireless communication terminal in a predetermined detection period. Furthermore, the wireless communication terminal calculates a value of an RQI according to the current service quality parameter of each of the plurality of APs, the roaming frequency, and the packet retransmission rate of the wireless communication terminal, and regulates a roaming threshold of the current AP according to the value of the RQI and determines the destination AP that has satisfied a roaming condition corresponding to the value of the RQI.

Abstract: A mobile terminal device detects current communication environment status of the device and calculates a value of a radio quality index (RQI), and adjusts the roaming threshold according to the value of the RQI. The device further calculates a value of a user movement index (UMI) and adjusts the frequency of the device for scanning object access points. After determining the object access point that has satisfied a roaming threshold, the device ends the communication between the device and the current access point, and establishes a communication between the device and the object access point.

Abstract: A mobile terminal device detects current communication environment status of the device and calculates a value of a radio quality index (RQI), and adjusts the roaming threshold according to the value of the RQI. The device further calculates a value of a user movement index (UMI) and adjusts the frequency of the device for scanning object access points. After determining the object access point that has satisfied a roaming threshold, the device ends the communication between the device and the current access point, and establishes a communication between the device and the object access point.

Abstract: A wireless communication terminal roaming from a current access point (AP) to a destination AP within a plurality of APs includes various functional modules. The wireless communication terminal detects a current service quality parameter of each of the plurality of APs, a roaming frequency, and a packet retransmission rate of the wireless communication terminal in a predetermined detection period. Furthermore, the wireless communication terminal calculates a value of an RQI according to the current service quality parameter of each of the plurality of APs, the roaming frequency, and the packet retransmission rate of the wireless communication terminal, and regulates a roaming threshold of the current AP according to the value of the RQI and determines the destination AP that has satisfied a roaming condition corresponding to the value of the RQI.