초록 ▼

A quality dispatch service on a CDMA based wireless system. To achieve spectral efficiency and fast access for follow-up calls, in response to a request by a talkgroup member to have a group call established, the non-requesting (listening-only) members are allowed to establish a low-rate (non-voice)

A quality dispatch service on a CDMA based wireless system. To achieve spectral efficiency and fast access for follow-up calls, in response to a request by a talkgroup member to have a group call established, the non-requesting (listening-only) members are allowed to establish a low-rate (non-voice) signaling link in the reverse direction (inbound) for the limited purpose of (i) providing forward power control information to the fixed infrastructure; (ii) requesting soft hand-off when required; and (iii) maintaining the correct reverse link power control to allow for fast channel access for a follow-on call. In accordance with the illustrative embodiment, the establishment of multiple inbound signaling links in a CDMA dispatch call occurs as a background process while beginning the voice communications immediately.

대표청구항 ▼

[ We claim:] [1.] 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 a same outbound link from the fi

[ We claim:] [1.] 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 a same outbound link from the fixed infrastructure, and wherein a first group member is transmitting a signal on a full-rate traffic 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 one of the subscriber units, associated with 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;transmitting the signal from the first group member to the fixed infrastructure; andafter the step of transmitting is initiated, establishing in the background for each of 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.