The disclosure relates to a 5G or 6G communication
system for supporting a higher
data transmission rate. Embodiments of the present invention relate to a method and
system for managing an ad hoc group call in a mission-critical (MC) communication
system. The method for managing an ad hoc group call in an MC communication system comprises a primary MC system (10) and a secondary MC system (30). A first MC service
server (25) in the primary MC system (10) receives an ad hoc group call
initiation request from a first MC service
client (15) including MC service identifiers of target users. The first MC service
server (25) invites a second MC service
client (20) by forwarding the request using a service ID assigned by the secondary MC system (30). Upon detecting that a third user has migrated to the secondary MC system (30), the first MC service
server (25) transmits a redirection notification to the first MC service
client (15) including both the old and new MC service IDs and the migration reason. The first MC service server (25) sends an ad hoc group call response indicating success or failure with details, and the ad hoc group call is established across the included MC systems (10, 30, 50).