4 Introduction
23.1803GPPMission critical services support in the Isolated Operation for Public Safety (IOPS) mode of operationRelease 17TS
For the case of a backhaul failure, mission critical (MC) services (e.g. MCPTT defined in 3GPP TS 23.379 [5] and MCData defined in 3GPP TS 23.282 [6]) can also be supported based on the availability of an isolated operation for public safety (IOPS) MC system. The IOPS MC system provides MC services support to the MC service UE via a single public land mobile network (PLMN) dedicated to the IOPS mode of operation. This IOPS dedicated PLMN is provided by an evolved packet system (EPS) supporting the IOPS mode of operation, as defined in 3GPP TS 23.401 [2].
A common functional architecture, including application plane and signalling plane, to support MC services in the IOPS mode of operation is specified in this document.