Hello Experts.
What is PTP and SyncE?
And how does it differs in LTE and 5G NR TDD, FDD?
PTP is a protocol (specified in IEEE1588 v2) that allows precise synchronization in times that can reach nanoseconds between cell phone base stations, with security of the data transmitted, by encryption. In short, deliver the timing to the edge of the network.
SyncE (or Synchronous Ethernet) is an ITU-T standard for computer networking that facilitates the transference of clock signals over the Ethernet physical layer. It uses the physical layer (Ethernet interfaces) to distribute frequency from the primary reference clock (PRC) to downstream devices. It supports frequency transfer from hop to hop and is used to provide frequency synchronization in networks.
Signal synchronization is essential for a successful consumer experience with 5G, ensuring better performance, including latency, more accuracy and better transmission quality.
Comparing both, PTP overcomes the problem in SyncE of requiring every hardware device to be upgraded. In PTP the packets can traverse the network just like any other protocol.
Here you have a nice article to better understand:
Also, nice videos explaining:
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How SyncE works https://www.youtube.com/watch?v=XTEGeqJRDfs
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How PTP works: https://www.youtube.com/watch?v=05-FHHr9oYo
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Is ptp mandatory in case on fdd as well ??
Some useful bullets:
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Synchronization is essential in networks (especially mobile networks) in order to ensure proper operation.
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PTP is one of the synchronization types that exists in phase/time.
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Precision Time Protocol (PTP) is a protocol for synchronizing clocks in computer networks. It provides precise time synchronization for systems that require it, such as mobile networks.
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PTP operates over Ethernet networks and uses a hierarchical, master-slave architecture to distribute time information.
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A single master device on the network acts as a reference clock, and the slave devices synchronize their clocks to the master. The protocol is designed to provide accurate time synchronization, with typical accuracy in the sub-microsecond range.
Precision Time Protocol (PTP), defined in the IEEE1588-2008 standard, is a protocol that uses a master-slave hierarchy to synchronize clocks on network devices. PTP uses hardware time stamping to achieve submicrosecond synchronization. PTP defines how real-time clocks in a network synchronize with each other. A network where PTP operates is called a PTP domain. This protocol operates by organizing clocks within a PTP domain into a master-slave hierarchy. The reference time for the entire system comes from the root clock, also known as the grandmaster clock.
PTP is more accurate than NTP because it uses hardware timestamping. PTP also accounts for device latency while synchronizing time. NTP synchronizes clocks with millisecond accuracy; PTP achieves submicrosecond accuracy.
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