Timing synchronization for device-to-device discovery for asynchronous LTE deployments

An apparatus for wireless communications, comprising:

• means for receiving at a mobile device, from a first base station, timing information for the first base station;
• and
• means for transmitting, from the mobile device, a timing signal comprising the timing information to at least one asynchronous mobile device served by a second base station, the timing signal being transmitted using one or more symbols at a first frequency during a first portion of a sub-frame reserved for device-to-device discovery, wherein an additional timing signal comprising timing information for an additional base station is transmitted using one or more symbols at a second frequency during a second portion of the sub-frame.

A method for wireless communications, comprising:

• transmitting, to a mobile device, timing information for a first base station;
• and
• transmitting instructions to the mobile device to transmit a timing signal comprising the timing information to at least one asynchronous mobile device served by a second base station using one or more symbols at a first frequency during a first portion of a sub-frame reserved for device-to-device discovery, wherein an additional timing signal comprising timing information for an additional base station is transmitted using one or more symbols at a second frequency during a second portion of the sub-frame.