Contactless data transfer systems and methods
Data may be transferred from a communication subsystem of a first device to a communication subsystem of a second device contactlessly, at high speed, and without intervention by host processors of either device. Devices may be programmed or personalized at the factory or warehouse, and may personalized at a warehouse or at a point of sale while in the box. Various modes of operation and use scenarios are described. Portions of the devices themselves, or a transmission path between the devices may be shielded against snooping by a material which degrades an EHF signal passing therethrough.
1. A method of data transfer, the method comprising:
while a host processor of a second device is in a powered-off or low-power state, the second device performs:
detecting a beacon sent by a first device;
establishing an extremely high frequency (EHF) contactless link between the second device and the first device in response to detecting the beacon;
receiving data from the first device via the contactless link;
storing the data in an exchange storage of the second device, the exchange storage separate from a primary storage of the second device;
powering up the host processor from the powered-off or low-power state to a powered-on state;
validating, by the host processor in the powered-on state, the data in the exchange storage; and
transferring the data from the exchange storage to the primary storage after the data is validated.
2. The method of claim 1 , further comprising: notifying the host processor upon completion of the data transfer.
3. The method of claim 1 , wherein: the data being transferred is selected from the group consisting of a media file, DRM protected content, an OS update, customer specific code, OEM specific code, retail specific code, a firmware image for the second device, user data, static data, encryption/decryption keys, and electronic funds transfer (EFT) data.
4. The method of claim 1 , wherein: the second device is enclosed inside of packaging.
5. The method of claim 4 , wherein: the contactless communication between the first and second devices occurs through the packaging.
6. The method of claim 4 , further comprising: providing a dielectric coupler in the packaging to facilitate the contactless link between the first and second devices.
7. The method of claim 1 , further comprising: providing a dielectric coupler extending from at least one of the first and second devices to facilitate the contactless link between the first and second devices.
8. The method of claim 1 , further comprising: at the first device, pausing transmission of the data stream at periodic intervals; and during the intervals, from the second device transmitting data to the first device.
9. The method of claim 1 , further comprising: covering at least one of portions of the devices or a transmission path between the devices with a material selected for its ability to degrade an EHF signal passing through the material.
10. The method of claim 1 , wherein the contactless link is the only contactless link established between a first communication subsystem of the first device and a second communication subsystem of the second device.
11. The method of claim 1 , further comprising transmitting an encryption code from the second device to the first device during a pause in the receiving of the data from the first device.