METHOD AND SUBSCRIBER UNIT FOR CONTROLLING INITIAL POWER RAMP-UP USING SHORT CODES
First Claim
1. A communication method for use with a code division multiple access (CDMA) subscriber unit, the method comprising:
- generating a first code, the first code having a first length;
generating a second code, the second code having a second length greater than the first length, the second code having a period, which is aligned with the length of the first code;
transmitting a first radio frequency signal from an antenna of the CDMA subscriber unit, the first radio frequency signal carrying the first code at a first power level, at least a portion of the second code, and data; and
in an absence of an acknowledgement signal received by the CDMA subscriber unit, setting a power level of the first code to a second power level, the second power level is greater than the first power level.
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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.
106 Citations
11 Claims
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1. A communication method for use with a code division multiple access (CDMA) subscriber unit, the method comprising:
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generating a first code, the first code having a first length; generating a second code, the second code having a second length greater than the first length, the second code having a period, which is aligned with the length of the first code; transmitting a first radio frequency signal from an antenna of the CDMA subscriber unit, the first radio frequency signal carrying the first code at a first power level, at least a portion of the second code, and data; and in an absence of an acknowledgement signal received by the CDMA subscriber unit, setting a power level of the first code to a second power level, the second power level is greater than the first power level. - View Dependent Claims (2, 3, 4)
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5. A code division multiple access (CDMA) subscriber unit, comprising:
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a circuit configured to generate a first code and a second code, the first code having a first length and the second code having a second length greater than the first length, the second code having a period, which is aligned with the length of the first code; and an antenna coupled to the circuit, the circuit supplying the first code, at least a portion of the long code, and data to the antenna such that the antenna transmits a first radio frequency signal carrying the first code at the first power level, at least a portion of the second code, and the data, wherein in an absence of an acknowledgement signal received by the CDMA subscriber unit, the circuit is configured to set a power level of the first code to a second power level, the second power level is greater than the first power level. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification