Method employed by a base station for controlling initial power ramp-up using short codes
First Claim
1. A wireless code division multiple access (CDMA) subscriber unit comprising:
- a transmitter configured such that, when the subscriber unit is first accessing a CDMA network, the transmitter successively transmits signals generated using a portion of a code until the subscriber unit receives from a base station associated with the network an indication that a transmitted one of the signals has been detected by the base station, wherein each transmission of one of the signals by the transmitter, other than a transmission of a first one of the signals, is at an increased power level with respect to a prior transmission of another one of the signals;
the transmitter further configured such that, subsequent to the subscriber unit receiving the indication, the transmitter transmits a signal generated using a remainder of the code,wherein, prior to receiving the indication, the subscriber unit is not uniquely identified to the base station.
0 Assignments
0 Petitions
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.
6 Citations
11 Claims
-
1. A wireless code division multiple access (CDMA) subscriber unit comprising:
-
a transmitter configured such that, when the subscriber unit is first accessing a CDMA network, the transmitter successively transmits signals generated using a portion of a code until the subscriber unit receives from a base station associated with the network an indication that a transmitted one of the signals has been detected by the base station, wherein each transmission of one of the signals by the transmitter, other than a transmission of a first one of the signals, is at an increased power level with respect to a prior transmission of another one of the signals; the transmitter further configured such that, subsequent to the subscriber unit receiving the indication, the transmitter transmits a signal generated using a remainder of the code, wherein, prior to receiving the indication, the subscriber unit is not uniquely identified to the base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification