I need an RF communication solution which has the properties of minimum 2Mbit/s, 200m line of sight, below 1ms RF synchronization, mesh capability, 50m for tall building floor to floor, and wake on RF
@yuksel.subasi HaLow definitely meets most of those requirements. The only one I’m not sure about is “1ms RF Synchronization”? What is your definition of “RF synchronization”?
@david.rice we have many modules that collects data for structural health monitoring. We need to synchronize the data. However there is no wire connection between the slaves and master, they communicate only with wireless, and we have to broadcast timing information from master to slaves over RF communication and it has to have lower than 1ms accuracy.
@yuksel.subasi, thanks for the updated info. I still am not 100% sure what you mean by 1ms accuracy but reading between the lines makes me think you need less than or equal to 1ms latency which is going to be tough to do on any 802.11 based wireless, not just HaLow.
I can stand directly under an enterprise wireless AP running on a 6GHz channel and still not get <= 1ms round trip time on a simple ping let alone a larger data packet. Plus, there are always environmental factors at play such as humidity/temperature changes, people and other objects temporarily in the path as well as multipath from reflections off of objects in the environment. You also have to consider the computing load on the devices involved as well. <=10 ms latency on average in the environment you describe is probably a little more doable.
If the problem is synchronising clocks, my understanding is that sub-ms accuracy is difficult to achieve over WiFi as David indicated. One of the trade-offs of running a full networking stack where many clients are sharing air time.
Is there an existing radio you’re using to support this level of accuracy?
Yes, LTP5901IPC-WHMA#PBF, however the data rate is low.
Have you considered using GNSS for timing accuracy? Or do your devices not always have a good view of the sky?
Our devices are inside the buildings.