A method of performing Pseudo-Noise, PN, quadrature covering for transmitting data via an access channel by an access terminal, the method comprising: receiving an access long code mask MI ACMAC and an access long code mask MQ ACMAC by the access terminal; generating a MI mask and a MQ mask for the PN quadrature covering by the access terminal; and transmitting the data via the access channel based on the generated MI mask and the generated MQ mask for the PN quadrature covering by the access terminal, wherein the MI ACMAC and the MQ ACMAC are related with an Access channel Medium Access Control, MAC, protocol, wherein MI3 to MI0 of the MI mask and MQ3 to MQ0 of the MQ mask are set to the lower 4 bits of an assigned channel number, wherein MI11 to MI4 of the MI mask are set to be equal to the result of (A31 to A24) ⊕ (A23 to A16) ⊕ (A15 to A8) ⊕ (A7 to A0), where A31 to A0 are lower 32 bits of the MI ACMAC, where (A31 to A24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MI ACMAC, wherein MQ11 to MQ4 of the MQ mask are set to be equal to the result of (B31 to B24) ⊕ (B23 to B16) ⊕ (B15 to B8) ⊕ (B7 to B1, B32), where B31 to B0 are lower 32 bits of the MQ ACMAC, where B32 is the 33rd bit of the MQ ACMAC, where (B31 to B24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MQ ACMAC, wherein (B7 to B1, B32) comprises an 8-bit sequence having the first 7 bits filled with the 8th bit to the 2nd bit of the MQ ACMAC and the last bit filled with the 33rd bit of the MQ ACMAC, wherein ⊕ denotes exclusive OR operation, and wherein the MI mask are a mask sequence for an In-phase branch of a Quadrature Phase Shift Keying, QPSK, symbol of the access channel and the MQ mask are a mask sequence for a Quadrature-phase branch of the QPSK symbol of the access channel. receiving an access long code mask MI ACMAC and an access long code mask MQ ACMAC by the access terminal; generating a MI mask and a MQ mask for the PN quadrature covering by the access terminal; and transmitting the data via the access channel based on the generated MI mask and the generated MQ mask for the PN quadrature covering by the access terminal, wherein the MI ACMAC and the MQ ACMAC are related with an Access channel Medium Access Control, MAC, protocol, wherein MI3 to MI0 of the MI mask and MQ3 to MQ0 of the MQ mask are set to the lower 4 bits of an assigned channel number, wherein MI11 to MI4 of the MI mask are set to be equal to the result of (A31 to A24) ⊕ (A23 to A16) ⊕ (A15 to A8) ⊕ (A7 to A0), where A31 to A0 are lower 32 bits of the MI ACMAC, where (A31 to A24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MI ACMAC, wherein MQ11 to MQ4 of the MQ mask are set to be equal to the result of (B31 to B24) ⊕ (B23 to B16) ⊕ (B15 to B8) ⊕ (B7 to B1, B32), where B31 to B0 are lower 32 bits of the MQ ACMAC, where B32 is the 33rd bit of the MQ ACMAC, where (B31 to B24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MQ ACMAC, wherein (B7 to B1, B32) comprises an 8-bit sequence having the first 7 bits filled with the 8th bit to the 2nd bit of the MQ ACMAC and the last bit filled with the 33rd bit of the MQ ACMAC, wherein ⊕ denotes exclusive OR operation, and wherein the MI mask are a mask sequence for an In-phase branch of a Quadrature Phase Shift Keying, QPSK, symbol of the access channel and the MQ mask are a mask sequence for a Quadrature-phase branch of the QPSK symbol of the access channel.