Method and apparatus for transmitting/receiving control channel in wireless communication system
A control channel transmission/reception method and an apparatus for transmitting/receiving control channels using a resource allocation scheme applicable regardless of reference signal transmission or whether the reference signal is transmitted in distributed transmission mode or localized transmission mode are provided. The control channel transmission method includes mapping a Demodulation Reference Signal (DMRS) to Resource Elements (REs) of a Resource Block (RB) for transmitting a control channel, mapping the control channel to the REs numbered with numbers of predetermined number of Resource Element Groups (REGs) in a frequency-first ascending order cyclically, with the exception of the REs to which the DMRS is mapped, and transmitting the DMRS and the control channel.
1. A method for receiving control information in a wireless communication system, the method comprising:
receiving the control information based on a resource block (RB) from a base station;
wherein, in the RB, a first difference between subcarrier indices corresponding to resource elements (REs) for a same control channel element (CCE) in a first symbol in which a demodulation reference signal (DMRS) is allocated is different from a second difference between subcarrier indices corresponding to REs for the same CCE in a second symbol in which the DMRS is not allocated.
2. The method of claim 1 , wherein the REs for the CCE are allocated in a first slot and a second slot of a subframe.
3. The method of claim 1 , wherein the receiving of the control information comprises assuming that REs for at least one of a cell-specific reference signal (CRS) and a channel state information reference signal (CSI-RS) are punctured.
4. The method of claim 1 , wherein the CCE includes an extended CCE (eCCE).
5. An apparatus for receiving control information, the apparatus comprising:
a transceiver configured to transmit and receive a signal to and from a base station; and
a controller configured to receive the control information based on a resource block (RB) from the base station,
wherein, in the RB, a first difference between subcarrier indices corresponding to resource elements (REs) for a same control channel element (CCE) in a first symbol in which a demodulation reference signal (DMRS) is allocated is different from a second difference between subcarrier indices corresponding to REs for the same CCE in a second symbol in which the DMRS is not allocated.
6. The apparatus of claim 5 , wherein the REs for the CCE are allocated in a first slot and a second slot of a subframe.
7. The apparatus of claim 5 , wherein the controller assumes that REs for at least one of a cell-specific reference signal (CRS) and a channel state information reference signal (CSI-RS) are punctured.
8. The apparatus of claim 5 , wherein the CCE includes an extended CCE (eCCE).