| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless communications network, including a base station (10) and wireless units (UE).SOLUTION: The wireless units (UE) request a connection with the base station (10) by the transmission of a preamble within time slots designated by the base station (10). The disclosed preambles are Walsh Hadamard code symbols, repeated so as to have the same length as a cell-specific scrambling code. A wireless unit (UE) requesting a connection pseudo-randomly selects a time slot from those available, and one of the Walsh Hadamard code symbols, scrambles a bitstream obtained from the code symbol, and transmits it to the base station (10). The base station (10) descrambles the incoming bitstream, following which the symbol is de-interleaved. The symbol is applied to a correlator (104, 126, 136) to determine the transmitted preamble. |
