BASE STATION FOR CONTROLLING INITIAL POWER RAMP-UP USING SHORT CODES
First Claim
1. A base station for use in a code division multiple access (CDMA) network, comprising:
- a receiver configured to receive, from a subscriber unit attempting to first access the network, a signal carrying no data of the subscriber unit; and
a transmitter configured to transmit to the subscriber unit an indication that the signal has been detected by the base station;
the transmitter further configured such that, subsequent to the transmitter transmitting the indication to the subscriber unit, the transmitter facilitates closed loop power control with the subscriber unit with respect to a communication channel associated with the base station,wherein, prior to transmitting the indication, the base station has not uniquely identified the subscriber unit.
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Accused Products
Abstract
A base station for controlling transmission power during the establishment of a communication channel utilizes the reception of a short code during initial power ramp-up. The short code is a sequence for detection by the base station which has a much shorter period than a conventional access code. The ramp-up starts from a power level that is lower than the required power level for detection by the base station. The power of the short code is quickly increased until the signal is detected by the base station. Once the base station detects the short code, it transmits an indication that the short code has been detected.
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Citations
1 Claim
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1. A base station for use in a code division multiple access (CDMA) network, comprising:
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a receiver configured to receive, from a subscriber unit attempting to first access the network, a signal carrying no data of the subscriber unit; and a transmitter configured to transmit to the subscriber unit an indication that the signal has been detected by the base station; the transmitter further configured such that, subsequent to the transmitter transmitting the indication to the subscriber unit, the transmitter facilitates closed loop power control with the subscriber unit with respect to a communication channel associated with the base station, wherein, prior to transmitting the indication, the base station has not uniquely identified the subscriber unit.
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Specification