Establishment of multiple low-rate inbound signaling links in CD

Multiplex communications – Channel assignment techniques – Combining or distributing information via code word channels...

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Details

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.

REFERENCES:
patent: 5295152 (1994-03-01), Gudmundson et al.
patent: 5724648 (1998-03-01), Shoughnessy et al.
patent: 5768684 (1998-06-01), Grubb et al.
patent: 5781536 (1998-07-01), Ahmadi et al.
patent: 5914958 (1999-06-01), Chinitz et al.
patent: 6005848 (1999-12-01), Grube et al.

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