19 PMIPv6 based restart procedures

23.0073GPPRelease 18Restoration proceduresTS

Across PMIPv6 based interfaces, SGW, PGW, TWAN and ePDG utilize PMIPv6 Heartbeat mechanism for node restart detection as specified in 3GPP TS 29.275 [16].

A PMIPv6 entity shall maintain two restart counters:

– in volatile memory a remote restart counter of a peer with which the entity is in contact;

– in non-volatile memory an own, or local restart counter that was sent to a peer.

After a PMIPv6 entity has restarted, it shall immediately increment all local restart counters and shall clear all remote restart counters.

A PMIPv6 entity may have a common local restart counter for all peers, or it may have a separate local restart counter for each peer.