Method for initial power control for spread-spectrum communications
First Claim
1. An improved method for maintaining control of power from a subscriber unit (SU) to a base station (BS), comprising the steps of:
- (a) sending from the SU to the BS, using spread-spectrum modulation, a SU-spreading code on a status channel;
(b) detecting, at the BS, the SU-spreading code from the SU;
(c) sending, from the BS to the SU, using spread-spectrum modulation, in response to detecting the SU-spreading code, a BS-spreading code on a checkup channel;
(d) detecting, at the SU, the BS-spreading code on the checkup channel;
(e) reducing, at the SU, in response to detecting the BS-spreading code, transmit power of the SU; and
(f) increasing, at the SU, in response to not detecting the BS-spreading code, transmit power of the SU.
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Accused Products
Abstract
A code-division-multiple-access (CDMA) system employing spread-spectrum modulation. The CDMA system has a base station (BS), and a plurality of subscriber units (SUs). The signals transmitted between the BS and SU use spread-spectrum modulation. The improvement method for maintaining control of power from an SU to a BS comprises sending from the subscriber unit, using spread-spectrum modulation, a SU-spreading code, and detecting, at the BS, the SU-spreading code from the SU. In response to detecting the SU-spreading code at the BS, a BS-spreading code is sent to the SU, using spread-spectrum modulation. At the SU, if the BS-spreading code is detected, then transmit power of the SU is reduced. If the BS-spreading code is not detected at the SU, then transmit power of the SU is increased.
190 Citations
5 Claims
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1. An improved method for maintaining control of power from a subscriber unit (SU) to a base station (BS), comprising the steps of:
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(a) sending from the SU to the BS, using spread-spectrum modulation, a SU-spreading code on a status channel;
(b) detecting, at the BS, the SU-spreading code from the SU;
(c) sending, from the BS to the SU, using spread-spectrum modulation, in response to detecting the SU-spreading code, a BS-spreading code on a checkup channel;
(d) detecting, at the SU, the BS-spreading code on the checkup channel;
(e) reducing, at the SU, in response to detecting the BS-spreading code, transmit power of the SU; and
(f) increasing, at the SU, in response to not detecting the BS-spreading code, transmit power of the SU. - View Dependent Claims (2, 3, 4, 5)
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Specification