GSM900 is 890-915 MHz; 802.11ah gets around this by using region specific frequencies that sidestep GSM900:
902-928 MHz in the US (26 MHz bandwidth)
863-868 MHz in Europe (5 MHz bandwidth)
916.5-927.5 MHz in Japan (11 MHz bandwidth)
Limited bandwidth, especially in Europe, will to lead to both higher power consumption and lower real-world range.
>The PHY layer will allow devices and APs to operate over different sub-1GHz ISM bands, depending on the country regulations: 863-868 MHz in Europe, 902-928 MHz in the US, and 916.5-927.5 MHz in Japan. China, South Korea, and Singapore also have specific channels.
It also means they'll be less channels available, so more noise. These frequencies are commonly used by things like door bells, burglar alarms, garage door openers, car locks, etc. I'm more worried what the effect will be on them.
902-928 MHz in the US (26 MHz bandwidth)
863-868 MHz in Europe (5 MHz bandwidth)
916.5-927.5 MHz in Japan (11 MHz bandwidth)
Limited bandwidth, especially in Europe, will to lead to both higher power consumption and lower real-world range.
>The PHY layer will allow devices and APs to operate over different sub-1GHz ISM bands, depending on the country regulations: 863-868 MHz in Europe, 902-928 MHz in the US, and 916.5-927.5 MHz in Japan. China, South Korea, and Singapore also have specific channels.
Reference: http://www.networkcomputing.com/wireless-infrastructure/sub-...