Random access method and signalling method for the same
A method for generating an iterative sequence and a signal transmission method using the same are disclosed. As the cell size or the distance between a user equipment (UE) and a Node-B increases, the CP is repeated at least one time while the iterative sequence is generated, the CP length and the ZCZ length are adjusted, so that the sequence timing point can be easily detected, orthogonality between sequences is maintained, and the sequences can be clearly distinguished from each other.
1. A method for a user equipment (UE) to perform a random access to a Node-B, the method comprising:
receiving information for a basic sequence index and a value of a circular shift (CS) unit from the Node-B; and
transmitting a preamble sequence to the Node-B over a random access channel,
wherein the preamble sequence is generated from Constant Amplitude Zero Auto-Correlation (CAZAC) sequences distinguishable by at least one of the basic sequence index and a length of the CS applied to the preamble sequence, and
wherein the length of the CS applied to the preamble sequence has a length corresponding to a multiple of the value of the CS unit.
2. The method according to claim 1 , wherein the information received from the Node-B is received over a broadcast channel (BCH).
3. The method according to claim 1 ,
wherein the random access channel comprises a cyclic prefix part and a basic sequence part, and
wherein at least one of the cyclic prefix part and the basic sequence part of the random access channel has a repetition pattern.
4. The method according to claim 3 , further comprising:
receiving information about at least one of a length of the cyclic prefix part and a length of the basic sequence part of the random access channel from the Node-B.
5. The method according to claim 1 , wherein the value of the CS is differently determined in accordance with a distance between the user equipment (UE) and the Node-B.
6. The method according to claim 1 , wherein the value of the CS is determined in consideration of a round trip delay (RTD) proportional to a cell size.
7. A user equipment (UE) for performing a random access to a Node-B, comprising:
a receiver configured to receive information for a basic sequence index and a value of a circular shift (CS) unit from the Node-B; and
a transmitter configured to transmit a preamble sequence to the Node-B over a random access channel,
wherein the preamble sequence, transmitted by the transmitter, is generated from Constant Amplitude Zero Auto-Correlation (CAZAC) sequences distinguishable by at least one of the basic sequence index and a length of the CS applied to the preamble sequence, and
wherein the length of the CS applied to the preamble sequence has a length corresponding to a multiple of the value of the CS unit.
8. The UE according to claim 7 , wherein the information received from the Node-B is received over a broadcast channel (BCH).
9. The UE according to claim 7 ,
wherein the random access channel comprises a cyclic prefix part and a basic sequence part, and
wherein at least one of the cyclic prefix part and the basic sequence part of the random access channel has a repetition pattern.
10. The UE according to claim 9 , wherein the receiver is configured to receive information about at least one of the basic sequence index, the value of the CS unit and a length of the cyclic prefix part and a length of the basic sequence part of the random access channel from the Node-B.
11. The UE according to claim 7 , wherein the value of the CS unit is differently determined in accordance with a distance between the user equipment (UE) and the Node-B.
12. The UE according to claim 7 , wherein the value of the CS unit is determined in consideration of a round trip delay (RTD) proportional to a cell size.