How PTP helps several major operators meet 5g timing requirements

PTP How to help several major operators meet 5G Timing requirements for
PTP How to help several major operators meet 5G Timing requirements for

Time and frequency synchronization is always very important for mobile networks . But as the 5G Launch , High precision time synchronization at microsecond level will be required , Even picosecond time synchronization .

Why time synchronization is so important for mobile networks ？
Because in the currently deployed mobile network , Time synchronization enables us to use the frequency band of the mobile base station more effectively . This means that we can provide more data within the specified frequency range , That's why we say 5G Download faster than 4G It's much faster . So the requirement for accuracy is even higher .

PTP How to help mobile operators meet 5G Timing requirements for

Why high precision time synchronization pairs 5G So important ？

5G Use a higher frequency , Shorter transmission distance . That means it needs more 、 Smaller areas , Each area has a base station to transmit signals . Dual connection enables mobile users to connect to multiple sites , This significantly improves the available bandwidth and speed . however , To make it work , Base stations must be fully synchronized to acquire radio signals in the correct order . This is new 5G An example of why features require the highest possible level of time synchronization . When we study 5G when , The level of time synchronization accuracy required at the beginning will be in the range of microseconds . With 5G Service development , We may put forward higher requirements for time synchronization , It could be nanosecond or even picosecond .

What time sources do mobile networks use ？

Most operators use GNSS (GNSS)— Include GPS、 BDS、GLONASS and Galileo— As their main source of time . But to ensure flexibility , It is important to have at least two different time sources from different locations . Satellite based time sources are subject to natural events （ Such as solar storm ） Or a malicious attack （ Such as interference ） Interference of .2019 year 7 month , European satellite system The Galileo system was interrupted for a week , This can be used in optical fiber PTP As a backup time source , Of course, some devices have the function of precise timing , It's also a good choice .