High precision synchronization in a shared medium

A non-transitory computer-readable medium storing instructions that, when executed by a processor of a first electronic device, cause the processor to perform operations, the operations comprising:

• receiving from a second electronic device, a first signal comprising data:
• a network-based time stamp, a corresponding accuracy of the network-based time stamp, and marker data;
• performing network-based synchronization with the second electronic device based on the network-based time stamp and the corresponding accuracy of the network-based time stamp, to synchronize a first clock of the first electronic device to a second clock of the second electronic device within the corresponding accuracy of the network-based time stamp;
• receiving a second signal at a first frequency;
• detecting, via phase lock loop (PLL) synchronization, a frequency change of the second signal based on the marker data, wherein the frequency change of the second signal identifies a time marker;
• determining a relative accuracy based at least on the first time marker, the marker data, the network-based time stamp, and the corresponding accuracy of the network-based time stamp;
• and
• updating the first clock based at least on the relative accuracy.

A method for a first electronic device comprising:

• transmitting a first signal over a shared medium, wherein the first signal comprises network synchronization data and marker data;
• transmitting a second signal on a first frequency;
• performing network-based synchronization with a second electronic device, wherein a clock of the second electronic device is updated based on the network synchronization data, wherein the network synchronization data comprises:
• a network-based time stamp, x, and a corresponding accuracy of the network-based time stamp, δt;
• wherein the marker data comprises:
• a rate of frequency change of the second signal comprising:
• x+∝·m·δt,
• where ∝ is a settable value greater than 2, and m is an integer;
• determining that the marker data is satisfied at a time marker;
• and
• based on the determination, transmitting the second signal on second frequency, where the second frequency is different than the first frequency,
• wherein the second electronic device detects a frequency change of the second signal, and updates the clock of the second electronic device based on:
• the time marker, the network synchronization data, and the marker data.