Sidelink Doppler Correction for Optimal Mobile Communications in 5G/6G

A method for a first wireless user device (“User-1”) to communicate with a second wireless user device (“User-2”), the method comprising:

• a) transmitting or broadcasting, by User-1, a first message indicating a location, a speed, a travel direction of User-1, and a wireless address or identification of User-1;
• b) wherein the first message is transmitted or broadcasted at a predetermined sidelink frequency (“fo”) allocated for communications directly between user devices;
• and wherein
• c) the first message is transmitted or broadcasted according to parameters (“slow” parameters) configured to enable User-2 to receive and demodulate the first message, notwithstanding a Doppler frequency shift caused by a relative motion of User-2 relative to User-1.

A method for a first mobile wireless user device (“User-1”) to communicate with a second mobile wireless user device (“User-2”), the method comprising:

• a) receiving, by User-1, a first message transmitted by User-2, wherein the first message indicates a location, a speed, and a travel direction of User-2, and wherein the first message is transmitted on a predetermined sidelink frequency (“fo”) allocated for sidelink communications;
• b) determining, by User-1, a location, a speed, and a travel direction of User-1;
• c) calculating, by User-1, a relative motion of User-2 relative to User-1 by comparing the location, speed, and travel direction of User-2 with the location, speed, and travel direction of User-1;
• and
• d) calculating, by User-1, a Doppler frequency shift Δf, relative to the predetermined sidelink frequency fo, according to the relative motion of User-2 relative to User-1.