LTE Direct is a new and innovative device-to-device technology being standardized in 3GPP-R12. By using this feature, one user can broadcast its information in 128-bit long expression and another user can read this information based on his/her interest.
It enables "always-on" discovery of thousands of devices and their services in a proximity of 500m, in a privacy sensitive and battery efficient way.
LTE Direct relies on the LTE physical layer to provide a scalable and universal framework for discovery and connection. It works seamlessly with LTE: Subframes are set aside for discovery; resources are time synced with geography.
Read more: https://ltedirect.qualcomm.com/