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AssigneeNTT Mobile Communications Network, Inc.
InventorsSHINJI UEBAYASHI, MOTOHIRO TANNO
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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.
A signal transmission method of a CDMA mobile communications system carrying out communications between a plurality of mobile stations and a base station by code division multiplex access, said signal transmission method comprising the step of:
A mobile station of a CDMA mobile communications system in which a plurality of mobile stations randomly access a base station through a common channel at any timings, and subsequently reserve a channel particular to each mobile station to carry out communications, said mobile station comprising:
A mobile station of the CDMA mobile communications system which suppresses transmission of a mute portion of speech and encodes a voice signal in a speech spurt portion, and transmits burst signals, said mobile station comprising:
A base station of a CDMA mobile communications system in which a plurality of mobile stations randomly access a base station through a common channel at any timings, and subsequently reserve a channel particular to each mobile station to carry out communications, said base station comprising:
A base station of a CDMA mobile communications system which suppresses a mute portion of speech and encodes a voice signal in a speech spurt portion, and transmits burst signals, said base station comprising:
Dependencies are inferred from the claim text.