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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 si

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.

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1. A method for transmitting a preamble sequence from user equipment to a base station to at least improve detection performance, the method comprising: generating, by the user equipment, a specific sequence, having a length (L), from a Zadoff-Chu Constant Amplitude Zero Auto Correlation (CAZAC) seq

1. A method for transmitting a preamble sequence from user equipment to a base station to at least improve detection performance, the method comprising: 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; andtransmitting, 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 preamble sequence causes a reduction in access time. 3. The method of claim 1, wherein the random access channel allows the user equipment to access a network in a state where the user equipment is not uplink synchronized with the base station. 4. The method of claim 1, further comprising transmitting, by the user equipment, the preamble for a predetermined time period through a frequency band. 5. The method of claim 1, further comprising transmitting, by the user equipment, a pilot including channel quality information. 6. The method of claim 1, wherein a preamble, synchronization timing information, pilot information, uplink resource allocation information and messages are also transmitted by the user equipment on the random access channel. 7. The method of claim 6, wherein the preamble and the messages are separately transmitted through the random access channel. 8. The method of claim 1, wherein the preamble is a repetitive pattern. 9. A system that transmits a preamble sequence to a base station to at least improve detection performance, the system comprising: user equipment adapted to: generate a specific sequence, having a length (L), from a Zadoff-Chu Constant Amplitude Zero Auto Correlation (CAZAC) sequence;apply a circular shift to the specific sequence by multiplying the specific sequence by an exponential sequence;repeat the circular-shifted specific sequence to generate a consecutive sequence having a length (N*L), wherein N is an integer greater than 1; andgenerate the preamble sequence by concatenating a single cyclic prefix (CP) to a front end of the consecutive sequence; anda 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. 10. The system of claim 9, wherein the preamble sequence causes a reduction in access time. 11. The system of claim 9, wherein the random access channel allows the user equipment to access a network in a state where the user equipment is not uplink synchronized with the base station. 12. The system of claim 9, wherein the user equipment is further adapted to transmit the preamble for a predetermined time period through a frequency band. 13. The system of claim 9, wherein the user equipment is further adapted to transmit a pilot including channel quality information. 14. The system of claim 9, wherein a preamble, synchronization timing information, pilot information, uplink resource allocation information and messages are also transmitted by the user equipment on the random access channel. 15. The system of claim 14, wherein the user equipment is adapted to transmit the preamble and the messages separately through the random access channel. 16. The system of claim 9, wherein the preamble is a repetitive pattern. 17. A non-transitory computer readable information storage media including instructions, that when executed by one or more processors, cause to be performed a method for transmitting a preamble sequence from user equipment to a base station to at least improve detection performance, the method comprising: 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; andtransmitting, by the user equipment, on a random access channel, the preamble sequence to the base station to access a cellular network. 18. The media of claim 17, wherein the preamble sequence causes a reduction in access time. 19. The media of claim 17, wherein the random access channel allows the user equipment to access a network in a state where the user equipment is not uplink synchronized with the base station. 20. The media of claim 17, wherein the method further comprises transmitting, by the user equipment, the preamble for a predetermined time period through a frequency band. 21. The media of claim 17, wherein the method further comprises transmitting, by the user equipment, a pilot including channel quality information. 22. The media of claim 17, wherein a preamble, synchronization timing information, pilot information, uplink resource allocation information and messages are also transmitted by the user equipment on the random access channel. 23. The media of claim 22, wherein the method further comprises separately transmitting, by the user equipment, the preamble and the messages through the random access channel. 24. The media of claim 17, wherein the preamble is a repetitive pattern.