Patent ID: 6115388
Filing Date: 2000-09-05
Classification: H04B,H04W

Abstract:
In a CDMA dispatch communication system comprising a fixed infrastructure and a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure, and wherein a first group member is transmitting a signal on an inbound link to the fixed infrastructure, a method of establishing multiple low-rate inbound links comprising the fixed infrastructure performed steps of:detecting a request by the subscriber unit of the first group member for a group call;establishing a full-rate traffic inbound link with the subscriber unit of the first group member for transmitting a signal to the fixed infrastructure;establishing a full-rate traffic outbound link with the subscriber units of each of the at least a plurality of group members so they can receive the signal from the fixed infrastructure; andprior to transmitting the signal from the first group member to the fixed infrastructure, establishing for each the at least a plurality of group members, including the second group member, a low-rate inbound link, different from said full-rate traffic inbound link, for receiving at least one of forward power control information, soft hand-off information and reverse power information therefrom.