Patent ID: 6944137

Claim:
In a wireless communication system comprising a plurality of subscriber units in wireless communication with a fixed infrastructure, a method for the fixed infrastructure to establish a talkgroup call, the method comprising steps of: receiving, from a first subscriber unit of the plurality of subscriber units, a request for the talkgroup call, the request comprising an identity of the first subscriber unit and an identity of a talkgroup; identifying, based on the identity of the talkgroup, a talkgroup of subscriber units comprising at least two subscriber units of the plurality of subscriber units; identifying, based on the identity of the first subscriber unit, a sub-talkgroup of subscriber units of the talkgroup; assigning an outbound code to subscribers in the talkgroup not part of the sub-talkgroup; assigning a plurality of outbound codes in a one-to-one manner to subscribers in the sub-talkgroup; and assigning, in a one-to-one manner, at least one inbound code to the sub-talkgroup.