Patent Number: 6,310,868

Title: Signal transmission method, mobile station device, and base station device for CDMA mobile communication system

Abstract: A CDMA communications system that can shorten a delay time until the establishment of traffic, and prevent excessive transmission power. Although transmission request signals RQ1, RQ2, RQ3, . . . sent from mobile stations through a common channel undergo only open loop power transmission control, and hence have large fluctuations in their received levels, their interference amount to message signals can be kept low because their received power is averagely about 1/a of that of the message signals MSG1, MSG2, MSG3, . . . The message signals are sent from the mobile stations in accordance with the power transmission control bits contained in a forward link signal ACK sent from the base station, followed by closed loop power transmission control. This enables the received level fluctuations at the base station to be kept low. Closed loop transmission power control of a reverse link signal RQ can further reduce the interference amount, in which case the power transmission control signal can be removed from the forward link signal ACK transmitted from the base station.

Inventors: Uebayashi; Shinji (Yokohama, JP), Tanno; Motohiro (Yokohama, JP)

Assignee: NTT Mobile Communications Network Inc.

International Classification: H04B 7/005 (20060101); H04J 13/04 (20060101); H04J 13/02 (20060101); H04B 007/216 ()

Expiration Date: 10/30/2018