Multi-radio handover manager system and algorithms for heterogeneous wireless networking

A multi-radio mobile device, comprising:

• a wireless local area network (WLAN) radio to connect to a WLAN, enabling the multi-radio mobile device to access the Internet;
• a wireless wide area network (WWAN) radio to connect to a WWAN, also enabling the multi-radio mobile device to access the Internet;
• a plurality of parameters of the mobile device, the plurality of parameters comprising a handover countdown timer, a WWAN white list timer, a WLAN handover received signal strength indicator (RSSI) threshold, WLAN handover RSSI margin, and a WWAN mobility timer, wherein the parameters are established when the mobile device is initialized;
• a handover manager to:
• turn off the WLAN radio after turning on the WWAN radio;
• and
• turn off the WWAN radio after turning on the WLAN radio, wherein turning off the WWAN radio after turning on the WLAN radio further comprises:
• confirming that the mobile device is connected to a WWAN base station specified by a base station identifier (BSID) from a WWAN status report and has been connected for longer than a time period specified by the WWAN mobility timer;
• confirming that the WWAN radio is “idle”;
• sending a WLAN ON command to the WLAN radio and starting the handover countdown timer in response to the currently connected WWAN base station being on a WWAN white list, wherein the WWAN white list comprises WWANs in which a prior successful handover to the WLAN has occurred;
• and
• confirming that the WLAN radio gets connected and a RSSI of the WLAN radio exceeds a sum of the WLAN handover RSSI threshold and the WLAN handover RSSI margin before the handover countdown timer expires before turning the WWAN radio off.