School of Specs 23.501v20.2.0

3GPP 23.501 v20.2.0 — the document's own text

K.2.2.5 Configuration for Sync and Announce intervals

Taught in 22. Clocks, TSN and deterministic delivery (The 5G system architecture, in depth).

The TSN AF or TSCTSF uses the values in portDS.logSyncInterval (for Boundary Clock) or portDS.initialLogSyncInterval, portDS.useMgtSettableLogSyncInterval and portDS.mgtSettableLogSyncInterval (for time-aware system) to configure the interval for the Sync messages (per PTP port) as described in IEEE Std 1588 [126] or IEEE Std 802.1AS [104], respectively. The TSCTSF or TSN AF configures those values as follows:

  • TSCTSF or TSN AF use PMIC to configure the values for the PTP ports in NW-TT.
  • TSCTSF or TSN AF use the "Time synchronization information for each DS-TT port" element in UMIC to configure the values for PTP ports in DS-TT(s) if NW-TT acts as GM on behalf of those DS-TTs.
  • TSCTSF or TSN AF use PMIC to configure the values for the PTP ports in DS-TT if the DS-TT is capable of acting as a GM.

When the NW-TT generates the (g)PTP Sync messages on behalf of the DS-TT, the NW-TT uses the values in the element "Time synchronization information for each DS-TT port" in UMIC to determine the Sync interval for the PTP ports the respective DS-TT. When DS-TT generates the (g)PTP Sync messages, the DS-TT uses the values in PMIC to determine the Sync interval for the PTP ports in this DS-TT.

The TSN AF or TSCTSF uses the values in portDS.logAnnounceInterval (for Boundary Clock) or portDS.initialLogAnnounceInterval, portDS.useMgtSettableLogAnnounceInterval and portDS.mgtSettableLogAnnounceInterval (for time-aware system) to configure the interval for the Announce messages (per PTP port) as described in IEEE Std 1588 [126] and IEEE Std 802.1AS [104], respectively. The TSCTSF or TSN AF configures those values as follows:

  • TSCTSF or TSN AF use PMIC to configure the values for the PTP ports in NW-TT.
  • TSCTSF or TSN AF use the "Time synchronization information for each DS-TT port" element in UMIC to configure the values for PTP ports in DS-TT(s) if NW-TT acts as GM on behalf of those DS-TTs.
  • TSCTSF or TSN AF use PMIC to configure the values for the PTP ports in DS-TT if the DS-TT is capable of acting as a GM.

When the NW-TT generates the (g)PTP Announce messages on behalf of the DS-TT, the NW-TT uses the values in the element "Time synchronization information for each DS-TT port" in UMIC to determine the Announce interval for the PTP ports the respective DS-TT. When DS-TT generates the (g)PTP Announce messages, the DS-TT uses the values in PMIC to determine the Announce interval for the PTP ports in this DS-TT.