US Patent No. 10,172,176

METHOD AND SYSTEM FOR INITIAL SYNCHRONIZATION AND COLLISION AVOIDANCE IN DEVICE TO DEVICE COMMUNICATIONS WITHOUT NETWORK COVERAGE


Patent No. 10,172,176
Issue Date January 01, 2019
Title Method And System For Initial Synchronization And Collision Avoidance In Device To Device Communications Without Network Coverage
Inventorship Nam Nguyen, Hanoi (VN)
Yufei Wu Blankenship, Kildeer, IL (US)
Sagar Dhakal, Richardson, TX (US)
Assignee BlackBerry Limited, Waterloo, Ontario (CA)

Claim of US Patent No. 10,172,176

1. A method at a device for enabling a device-to-device wireless link, the method comprising:listening for a presence signal from another device on a channel for a first time period comprising a predetermined frame period; and
transmitting a presence signal and system frame number on the channel to establish a time-slot boundary;
wherein the transmitting of the presence signal enables another device to align to the established time-slot boundary.