Method of transmitting data in a mobile communication system
Disclosed is a data transmission method in a mobile communication system. The data transmission method through a code sequence in a mobile communication system includes grouping input data streams into a plurality of blocks consisting of at least one bit so as to map each block to a corresponding signature sequence, multiplying a signature sequence stream, to which the plurality of blocks are mapped, by a specific code sequence, and transmitting the signature sequence stream multiplied by the specific code sequence to a receiver.
1. A method for transmitting a preamble sequence from user equipment to a base station to at least improve detection performance, the method comprising:
receiving, from the base station, position information of an allocated random access channel resource, the position information including frequency and timing information;
generating, by the user equipment, a specific sequence, having a length (L), from a Zadoff-Chu Constant Amplitude Zero Auto Correlation (CAZAC) sequence;
applying, by the user equipment, a circular shift to the specific sequence by multiplying the specific sequence by an exponential sequence;
repeating, by the user equipment, the circular-shifted specific sequence to generate a consecutive sequence having a length (N*L), wherein N is an integer greater than 1;
generating, by the user equipment, the preamble sequence by concatenating a single cyclic prefix (CP) to a front end of the consecutive sequence; and
transmitting, by the user equipment, on a random access channel the preamble sequence to the base station to access a cellular network.
2. The method of claim 1 , wherein the position information is expressed by one or more of subcarrier offset, number of sub-carriers, timing offset, and a number of symbols.
3. The method of claim 1 , wherein the receiving step comprises receiving the position information over a broadcast channel.
4. The method of claim 1 , where in the receiving step comprises receiving the position information over a downlink control channel.
5. A system that transmits a preamble sequence to a base station to at least improve detection performance, the system comprising:
user equipment adapted to:
receive, from the base station, position information of an allocated random access channel resource, the position information including frequency and timing information;
generate, by the user equipment, a specific sequence, having a length (L), from a Zadoff-Chu Constant Amplitude Zero Auto Correlation (CAZAC) sequence;
apply, by the user equipment, a circular shift to the specific sequence by multiplying the specific sequence by an exponential sequence;
repeat, by the user equipment, the circular-shifted specific sequence to generate a consecutive sequence having a length (N*L), wherein N is an integer greater than 1;
generate, by the user equipment, the preamble sequence by concatenating a single cyclic prefix (CP) to a front end of the consecutive sequence; and
a transmitter in the user equipment adapted to transmit on a random access channel the preamble sequence to the base station to access a cellular network.
6. The system of claim 5 , wherein the position information is expressed by one or more of subcarrier offset, number of sub-carriers, timing offset, and a number of symbols.
7. The system of claim 5 , wherein the receiving step comprises receiving the position information over a broadcast channel.
8. The system of claim 5 , where in the receiving step comprises receiving the position information over a downlink control channel.
9. A method for transmitting a preamble sequence from user equipment to a base station to at least improve detection performance, the method comprising:
receiving from the base station position information of an allocated random access channel resource, the position information including frequency and timing information;
generating, by the user equipment, a specific sequence, having a length (L), from a Zadoff-Chu Constant Amplitude Zero Auto Correlation (CAZAC) sequence;
applying, by the user equipment, a circular shift to the specific sequence by multiplying the specific sequence by an exponential sequence;
repeating, by the user equipment, the circular-shifted specific sequence to generate a consecutive sequence having a length (N*L), wherein N is an integer greater than 1;
generating, by the user equipment, the preamble sequence by concatenating a single cyclic prefix (CP) to a front end of the consecutive sequence; and
attempting, by the user equipment, access over the random access channel resource in a current frame, and, when the attempt is successful, transmitting, by the user equipment the preamble sequence to the base station to access a cellular network.
10. The method of claim 9 , wherein when the attempt is not successful, attempting, by the user equipment, access over the random access channel resource in a subsequent frame.
11. A system that transmits a preamble sequence to a base station to at least improve detection performance, the system comprising:
user equipment adapted to:
receive from the base station position information of an allocated random access channel resource, the position information including frequency and timing information;
generate, by the user equipment, a specific sequence, having a length (L), from a Zadoff-Chu Constant Amplitude Zero Auto Correlation (CAZAC) sequence;
apply, by the user equipment, a circular shift to the specific sequence by multiplying the specific sequence by an exponential sequence;
repeat, by the user equipment, the circular-shifted specific sequence to generate a consecutive sequence having a length (N*L), wherein N is an integer greater than 1;
generate, by the user equipment, the preamble sequence by concatenating a single cyclic prefix (CP) to a front end of the consecutive sequence; and
attempt, by the user equipment, access over the random access channel resource in a current frame, and, when the attempt is successful, transmitting, by the user equipment the preamble sequence to the base station to access a cellular network.
12. The system of claim 11 , wherein when the attempt is not successful, attempting, by the user equipment, access over the random access channel resource in a subsequent frame.