Radio communication system
First Claim
Patent Images
1. A portable device for communication with a base station, the portable device comprising:
- a transmitter configured to transmit a first message to the base station; and
a controller configured to adjust an output of the transmitter in response to reception of a control signal from the base station, to terminate transmission of a second message when the reception of the control signal is interrupted, and to retransmit the second message upon reception of the control signal, wherein the control signal includes a scrambling code which is different than that used for other downlink transmissions by the base station.
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Abstract
A system and method of operating a radio communication system uses a random access channel to enable a secondary station to transmit a message to a primary station. The secondary station transmits a preamble to the primary station. After successful receipt of the preamble the primary station transmits a control channel including power control information to instruct the secondary station to adjust the output power of its transmitter. This ensures that the secondary station transmits at a sufficient power for the message to be received successfully by the primary station, while minimizing interference generated by the transmission.
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Citations
13 Claims
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1. A portable device for communication with a base station, the portable device comprising:
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a transmitter configured to transmit a first message to the base station; and a controller configured to adjust an output of the transmitter in response to reception of a control signal from the base station, to terminate transmission of a second message when the reception of the control signal is interrupted, and to retransmit the second message upon reception of the control signal, wherein the control signal includes a scrambling code which is different than that used for other downlink transmissions by the base station. - View Dependent Claims (2, 3, 4, 5)
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6. A portable device for communication with a base station, the portable device comprising:
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means for transmitting a first message to the base station; means for adjusting an output of the transmitter in response to reception of a control signal from the base station; and means for terminating transmission of a second message when the reception of the control signal is interrupted; wherein the means for transmitting is configured to retransmit the second message upon reception of the control signal, wherein the control signal includes a scrambling code which is different than that used for other downlink transmissions by the base station. - View Dependent Claims (7, 8, 9, 10)
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- 11. A communication system comprising a base station and a portable device, the base station including a transmitter configured to transmit a control signal to the portable device in response to reception of a first message from the portable device, the control signal including power control information for the portable device to alter output of its transmission, the base station further including a controller configured to interrupt transmission of the control signal when a second message from the portable device is received in a corrupted state, and to retransmit the control signal to cause the portable device to retransmit the second message, wherein the controller is further configured to select a scrambling code for the control signal which is different than that used for other downlink transmissions.
Specification