초록 ▼

A cellular radio system in which a base station receiver can receive, on the reverse link, data from a mobile terminal in one of four control modes. In the first mode, the mobile terminal sends an independent user pilot, not synchronized with the base station, on the reverse link and the user data c

A cellular radio system in which a base station receiver can receive, on the reverse link, data from a mobile terminal in one of four control modes. In the first mode, the mobile terminal sends an independent user pilot, not synchronized with the base station, on the reverse link and the user data channel is synchronized to this independent user pilot. In the second mode, the mobile terminal slaves its user pilot to the pilot it receives from the base station and the user data channel is synchronized with this slaved user pilot. This second mode allows the user terminal to receive round trip delay information for purposes of geolocation and rapid reacquisition. In the third mode, the mobile terminal slaves its user pilot to the incoming base station pilot, as in the case of mode two, but the user data channel operates in the orthogonal mode using the ranging information received from the base station. The phase relationship between the user pilot channel and the user data channel is calibrated. The user pilot carrier is also the carrier for the user data channel and can be used as the carrier reference for detecting the user data channel. In the fourth mode, the slaved pilot implementation of mode three is used for acquisition but, after acquisition, the user pilot code is phase shifted to be synchronous with the user data channel, thus also making it an orthogonal channel. In this mode, the pilots no longer contribute interference to the user data channels, within the cell, and can be transmitted at higher power levels.

대표청구항 ▼

[ I claim:] [1.] A mobile terminal for use in a spread spectrum CDMA communication system, the mobile terminal comprising:means for receiving from a base station, a base-pilot signal and a base-data signal, each with a pseudo random chip code sequence;means for transmitting to the base station a rem

[ I claim:] [1.] A mobile terminal for use in a spread spectrum CDMA communication system, the mobile terminal comprising:means for receiving from a base station, a base-pilot signal and a base-data signal, each with a pseudo random chip code sequence;means for transmitting to the base station a remote-pilot signal and a remote-data signal, each with a pseudo random chip code sequence;means for synchronizing the chip code sequence of the transmitted remote-pilot signal to the chip code sequence of the received base-pilot signal for enabling the base station to generate a range determination;means for receiving a range determination from the base station;code phase adjustment means responsive to a mode control means for adjusting a phase of the remote-data signal and remote-pilot signal; andthe mode control means for selecting one of a plurality of operating modes of the mobile terminal; wherein the plurality of operating modes comprises a first mode in which the chip code sequence of the remote-pilot signal is synchronized to the chip code sequence of the received base-pilot signal, a second mode in which the remote-data signal is range adjusted, and a third mode in which the remote-pilot signal is range adjusted, whereby the base station receives the range adjusted remote-data signal and the range-adjusted remote-pilot signal orthogonal to other range adjusted signals.