GCS-Action-Request Message ( 8388662 )
The GAR command is sent by the Group Communication Service (GCS) AS to the Broadcast-Multicast Service Centre (BMSC) as part of the MBMS bearer activation, modification, or deactivation procedure, or as part of the Temporary Mobile Group Identity (TMGI) allocation or deallocation procedure.
Reference: 3GPP TS 29.468-f40
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