Multiplex communications – Channel assignment techniques – Combining or distributing information via code word channels...
Patent
1997-10-28
2000-09-05
Vu, Huy D.
Multiplex communications
Channel assignment techniques
Combining or distributing information via code word channels...
370342, 370335, 370266, 455518, H04B 7216, H04B 700, H04L 1216, H04Q 1100
Patent
active
061153885
ABSTRACT:
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 low-rate inbound signaling links occurs prior to beginning the voice communications. Because a low-rate signaling link, as contemplated by the present invention, is a non-voice link which signals at a predetermined rate substantially less than that of a full-rate traffic link, proportionately less average power is required for dispatch communications than would otherwise be the case if full-rate traffic links were provided instead to non-talking talkgroup members. The present solution results in less interference to the CDMA system and thus substantially less impact on overall system capacity.
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Chinitz Leigh M.
Needham Michael L.
Wilson Timothy J.
Harper Kevin C.
Jacobs Jeffrey K.
Motorola Inc.
Pappas George C.
Vu Huy D.
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