Signal quality determination methods and apparatus suitable...

H - Electricity – 04 – W

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H04W 36/30 (2009.01) H04W 24/10 (2009.01) H04W 36/14 (2009.01)

Patent

CA 2667820

A mobile terminal is adapted to operate in a WLAN and a WWAN. The mobile terminal performs communication operations using its WLAN transceiver portion for maintaining a voice or data call via a wireless AP of the WLAN. During this time, the mobile terminal identifies a RSSI value and a SNR value of an RF signal of the wireless AP. If the RSSI value is less than a predetermined RSSI value, and the SNR value is less than a predetermined SNR value, then the mobile terminal provides an indication to switch the communication operations from the WLAN to the WWAN. However, if the RSSI value is less than the predetermined RSSI value, but the SNR value is greater than the predetermined SNR value, the mobile terminal provides an indication to maintain the communication operations in the WLAN. In a concurrent process, the mobile terminal determines a transmission error value for data packet transmissions based on a count of data packet .errors identified over a predetermined time period. A data packet error may be identified by identifying a complete failure to transmit the data packet or a reduced data transmission rate for the transmission. An increased count or multiplier may be included for each data packet error that is associated with a complete failure or a low data transmission rate. The increased count or multiplier may vary depending on severity. A transmission error percentage value is calculated based on the transmission error value and the total number of attempted data packet transmissions over the predetermined time period. If the transmission error percentage value is greater than a predetermined percent error value, the mobile terminal provides the indication to switch the communication operations from the WLAN to the WWAN.

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