Patent ID: 9693370
Date: 2017-06-27
CPC Classifications: H04J,H04L,H04W

Claim:
1. A method for operating a terminal device, the terminal device transmitting a random access preamble in a transmitting sub-frame, the sub-frame comprising a number of OFDM, Orthogonal Frequency-Division Multiplexing, symbols in a time domain, the method comprising: creating a sequence that comprises a plurality of random access sequences; dividing the plurality of random access sequences into a number N performing code division multiplexing to the groups of the plurality of random access sequences in a frequency domain, based on an orthogonal cover code selected for the terminal device from a pre-defined code set; transforming signals after the code division multiplexing into the time domain to generate the random access preamble for the terminal device; and transmitting the generated random access preamble in the transmitting subframe to a network device for decreasing a random access collision probability due to the extension of code domain, such that the random access capacity increases, wherein each random access sequence corresponds to each of the OFDM symbols and has the same length as each one of the OFDM symbols, wherein dividing the plurality of random access sequences into a number N dividing the plurality of random access sequences such that the size of the first N wherein N