Method of transmitting scheduling request in a wireless communication system
A method and apparatus for requesting uplink resources in a wireless communication system is provided. A user equipment determines whether a scheduling request for requesting uplink resources is triggered. If the scheduling request is triggered, the user equipment transmits a first set of frequency domain sequences and a second set of frequency domain sequences in a subframe.
1. A method for transmitting a scheduling request in a wireless communication system, the method comprising:
generating, by a user equipment, a modulation symbol by modulating control information;
generating, by the user equipment, a plurality of first sequences for a plurality of orthogonal frequency division multiplexing (OFDM) symbols by cyclically shifting a base sequence;
generating, by the user equipment, a plurality of second sequences by multiplying plurality of first sequences by the modulation symbol;
generating, by the user equipment, a plurality of third sequences by multiplying the plurality of second sequences by an orthogonal sequence; and
transmitting, by the user equipment, the plurality of third sequences to represent the transmission of the scheduling request and the control information in the plurality of OFDM symbols,
wherein each of the plurality of third sequences is transmitted in a corresponding one of the OFDM symbols,
wherein a cyclic shift value of the base sequence corresponding to each of the plurality of first sequences is determined based on a corresponding one of the plurality of OFDM symbols, and
wherein the orthogonal sequence is determined based on a number of the plurality of OFDM symbols.
2. The method of claim 1 , further comprising:
receiving, by the user equipment, assignment information to assign a radio resource used for a transmission of the scheduling request for requesting uplink resources to be used for uplink data transmission.
3. The method of claim 1 , wherein the modulation symbol is generated by using a binary phase shift keying (BPSK) or a quadrature phase shift keying (QPSK).
4. The method of claim 1 , wherein the number of the plurality of OFDM symbols is three or four.
5. The method of claim 1 , wherein the base sequence is defined as a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence.
6. A device for transmitting a scheduling request in a wireless communication system, the device comprising:
a processor; and
a memory operatively coupled with the processor and storing instructions that when executed by the processor cause the device to:
generate a modulation symbol by modulating control information;
generate a plurality of first sequences for a plurality of orthogonal frequency division multiplexing (OFDM) symbols by cyclically shifting a base sequence;
generate a plurality of second sequences by multiplying plurality of first sequences by the modulation symbol;
generate a plurality of third sequences by multiplying the plurality of second sequences by an orthogonal sequence; and
transmit the plurality of third sequences to represent the transmission of the scheduling request and the control information in the plurality of OFDM symbols,
wherein each of the plurality of third sequences is transmitted in a corresponding one of the OFDM symbols,
wherein a cyclic shift value of the base sequence corresponding to each of the plurality of first sequences is determined based on a corresponding one of the plurality of OFDM symbols, and
wherein the orthogonal sequence is determined based on a number of the plurality of OFDM symbols.
7. The device of claim 6 , wherein the number of the plurality of OFDM symbols is three or four.
8. The device of claim 6 , wherein the modulation symbol is generated by using a binary phase shift keying (BPSK) or a quadrature phase shift keying (QPSK).
9. The device of claim 6 , wherein the base sequence is defined as a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence.