Method and apparatus for performing resource allocation in wireless communication system

1. A method for performing, by a user equipment (UE), resource allocation in a wireless communication system, the method comprising:

receiving a configuration of an entire system bandwidth, the entire system bandwidth including a predefined system bandwidth and a carrier segment which is bandwidth not available to be the predefined system bandwidth;

checking, in the configuration, information for the entire system bandwidth and an indication that indicates whether or not the entire system bandwidth is available for the UE; and

receiving a reference signal and a control signal at subframes determined based on the indication and the information,

wherein the configuration of the entire system bandwidth is determined by comparing a number of available resource blocks for the entire system bandwidth and a predetermined threshold.

2. The method of claim 1 , wherein the configuration of the entire system bandwidth is received by a serving cell (Scell) configuration, a transmission mode (TM) configuration, or a radio resource control (RRC) configuration.

3. The method of claim 1 , wherein the indication is received by system information, or one among a DCI format 0, a DCI format 1A, a DCI format 2C, a DCI format 2D, and a DCI format 4.

4. The method of claim 1 , wherein checking the information includes:

determining whether different TM configurations of a Physical Downlink Control Channel (PDCCH) and an enhanced PDCCH (ePDCCH) for the predefined system bandwidth and a bandwidth of the carrier segment are set, or a TM configuration for the entire system bandwidth is set.

5. The method of claim 4 , wherein checking the information further includes:

determining whether or not ePDCCH monitoring subframes in the carrier segment are configured.

6. The method of claim 5 , wherein checking the information further includes:

determining whether Multicast-broadcast single-frequency network (MBSFN) subframes in the carrier segment are configured or not.

7. The method of claim 6 , wherein checking the information further includes:

determining whether a channel state information (CSI)-reference signal (RS) configuration in the carrier segment is identical with a CSI-RS configuration in the predefined system bandwidth.

8. The method of claim 7 , wherein checking the information further includes:

determining whether an ePDCCH starting position in the carrier segment is identical with an ePDCCH starting position in the predefined system bandwidth.

9. The method of claim 1 , wherein the entire system bandwidth includes at least two predefined system bandwidths and the carrier segment, wherein a predefined system bandwidth corresponds to a serving cell, and

wherein the predefined system bandwidth includes one of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, and 20 MHz and the carrier segment includes 1 MHz or 6 MHz.

10. A user equipment for performing resource allocation in a wireless communication system, the UE comprises:

a radio frequency (RF) unit for transmitting and receiving a radio signal; and

a processor operatively coupled to the RF unit, that:

controls the RF unit to receive a configuration of an entire system bandwidth, the entire system bandwidth including a predefined system bandwidth and a carrier segment which is bandwidth not available to be the predefined system bandwidth;

checks, in the configuration, information for the entire system bandwidth and an indication that indicates whether or not the entire system bandwidth is available for the UE; and

controls the RF unit to receive a reference signal and a control signal at subframes determined based on the indication and the information,

wherein the configuration of the entire system bandwidth is determined by comparing a number of available resource blocks for the entire system bandwidth and a predetermined threshold.

11. The UE of claim 10 , wherein the configuration of the entire system bandwidth is received by a serving cell (Scell) configuration, a transmission mode (TM) configuration, or a radio resource control (RRC) configuration.

12. The UE of claim 10 , wherein the further:

determines whether different TM configurations of a Physical Downlink Control Channel (PDCCH) and an enhanced PDCCH (ePDCCH) for the predefined system bandwidth and a bandwidth of the carrier segment are set, or a TM configuration for the entire system bandwidth is set;

determines whether or not ePDCCH monitoring subframes in the carrier segment are configured;

determines whether or not Multicast-broadcast single-frequency network (MBSFN) subframes in the carrier segment are configured;

determines whether a channel state information (CSI)-reference signal (RS) configuration in the carrier segment is identical with a CSI-RS configuration in the predefined system bandwidth; or

determines whether an ePDCCH starting position in the carrier segment is identical with an ePDCCH starting position in the predefined system bandwidth.

13. The UE of claim 10 , wherein the entire system bandwidth includes at least two predefined system bandwidths and the carrier segment, wherein a predefined system bandwidth corresponds to a serving cell, and

wherein the predefined system bandwidth includes one of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, and 20 MHz and the carrier segment includes 1 MHz or 6 MHz.