Telephone with automatic switching between cellular and VoIP networks

摘要

A mobile communication device includes, in part, a cellular communication module, a first antenna adapted to receive and transmit data between the mobile communication module and a cellular network, a Wireless Fidelity (Wi-Fi) communication module, a second antenna adapted to receive and transmit data between the Wi-Fi communication module and a VoIP network, a signal monitoring circuit, and a switching circuit adapted to switch an existing communication from the cellular communication module to the Wi-Fi communication module or vice versa.

主权项

1. A mobile communication device comprising:
a cellular communication module adapted to communicate with a wireless cellular network; a Wi-Fi communication module adapted to communicate with an access point associated with a Wi-Fi network using a VoIP protocol; and a switching circuit adapted to automatically switch operation between the cellular communication module and the Wi-Fi communication module, wherein if a Wi-Fi signal monitor detects that the Wi-Fi signal level is below a second predefined threshold value Vth2, a timer is activated to establish a second time window of a second predefined size T2, wherein if during time window T2, the Wi-Fi signal monitor detects that the Wi-Fi signal level is equal to or greater than a third predefined threshold value Vth3, a previously established VoIP communication continues without switching, wherein Vth3 is smaller than Vth2.