Method employed by a base station for controlling initial power ramp-up using short codes
First Claim
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1. A method of accessing a communication system by a subscriber unit, the method comprising:
- providing at least one long code;
producing a short code by selecting a portion of the at least one long code and transmitting the short code;
repeating a plurality of times the producing and transmitting of the short code; and
transmitting a remainder of a long code of the at least one long code after the transmission of the short codes, the transmitting the remainder of the long code is time synchronized to the transmission of the short codes.
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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.
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Citations
19 Claims
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1. A method of accessing a communication system by a subscriber unit, the method comprising:
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providing at least one long code;
producing a short code by selecting a portion of the at least one long code and transmitting the short code;
repeating a plurality of times the producing and transmitting of the short code; and
transmitting a remainder of a long code of the at least one long code after the transmission of the short codes, the transmitting the remainder of the long code is time synchronized to the transmission of the short codes. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A subscriber unit for accessing a communication system, the subscriber unit comprising:
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means for providing at least one long code;
means for producing a short code by selecting a portion of the at least one long code and transmitting the short code;
means for repeating a plurality of times the producing and transmitting of the short code; and
means for transmitting a remainder of a long code of the at least one long code after the transmission of the short codes, the transmitting the remainder of the long code is time synchronized to the transmission of the short codes. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A subscriber unit for accessing a communication system, the subscriber unit comprising:
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a code generator for providing at least one long code;
a code transmitter for transmitting a short code, the short code is produced by selecting a portion of the at least one long code, the code transmitter repeatedly transmitting short codes a plurality of times; and
a transmitter for transmitting a remainder of a long code of the at least one long code after the transmission of the short codes, the transmitting of the remainder of the long code is time synchronized to the transmission of the short codes. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A base station for providing access to a communication system, the base station comprising:
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means for detecting a short code transmitted by a subscriber unit;
said short code being a portion of a long code configured to request access to a communication system; and
means for receiving a remainder of the long code after reception of the short code wherein transmission of the remainder of the long code is time synchronized to transmission of the short code.
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Specification
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Current AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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Original AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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InventorsLomp, Gary R., Ozluturk, Fatih
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current370/335
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CPC Class CodesH04B 1/707 using direct sequence modul...H04B 1/7075 with code phase acquisitionH04B 1/70753 Partial phase searchH04B 1/70755 Setting of lock conditions,...H04B 1/70758 Multimode search, i.e. usin...H04B 1/7077 Multi-step acquisition, e.g...H04B 1/708 Parallel implementationH04B 2201/70701 featuring pilot assisted re...H04B 2201/70702 Intercell-related aspectsH04B 2201/70703 using multiple or variable ...H04B 2201/7071 with dynamic control of rec...H04B 7/2628 using code-division multipl...H04W 52/36 with a discrete range or se...H04W 52/367 Power values between minimu...H04W 52/50 at the moment of starting c...H04W 52/60 using different transmissio...
