CPC H04W 80/12 (2013.01) [H04W 4/08 (2013.01); H04W 60/06 (2013.01); H04W 76/11 (2018.02)] | 14 Claims |
1. A method performed by a group management server in a communication system, the method comprising:
receiving, from a terminal included in a group, a de-registration request message for the group, the de-registration request message including an identity (ID) of the group;
checking an authorization of a group de-registration request and updating a member list of the group;
transmitting, to the terminal, a de-registration response message for the group, the de-registration response message including information on a result of the group de-registration request; and
transmitting, to another terminal included in the group or a vertical application layer (VAL) server, an identity list notification message based on a subscription result indicating whether a subscription to receive notification for member information of the group is successful or not.
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