wifi-direct v.s. blooth 4.0

The fight is on for wireless device-to-device networking supremacy b/w a refreshed incumbent BT4.0 and a newcomer Wi-Fi Direct.
Both specifications are promising to make it easier for users to quickly transfer data b/w two wireless devices such as smartphone and laptop without the need for a WIFI network or USB cable.

WiFi Direct v.s. BT 4.0
    Wi-Fi Alliance / Bluetooth SIG(Special Interest Group)
    up to 250Mbps / up to 3Mbps
    Wi-Fi Direct: 656 feet, more than two football fields
    BT 4.0: less than 200 feet, but dependent on capacity of BT device rather than specification

    Wi-Fi Direct: WPA2 (AES 256-bit)
    BT 4.0: AES 128-bit

   Both claim their specifications will use low-energy technology for battery-powered device

Backward compatibility:
    Wi-Fi Direct: compatible with all legacy Wi-Fi devices
    BT 4.0: dependent on modes in which devices use

    WiFi - ad hoc mode is painful to setup and max out at speed 11Mbps
    BT - 4.0's low-energy technology is not compatible with existing BT devices*.
*That doesn't mean a BT 4.0-equipped smartphone is unable to work with a BT 2.1 headset.
It means that a device only use BT's low-energy technology is unable to talk to an older BT device.
It should be manufacturers' duty to incorporate low-energy technology into a newer device using old BT, so the backward compatibility problem only affects older BT devices, and not BT specifications.
     WiFi Direct:
        Jelly Bean-only, an Android App. released by Open Garden, 2012/06
     BT 4.0:
        To be confirmed

(To be continued)



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