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A method of allocating resources in a wireless communication system includes allocating a plurality of physical resource blocks, each of which includes a plurality of sub-parts, to a virtual resource block, and mapping the virtual resource block to the plurality of physical resource blocks, wherein

A method of allocating resources in a wireless communication system includes allocating a plurality of physical resource blocks, each of which includes a plurality of sub-parts, to a virtual resource block, and mapping the virtual resource block to the plurality of physical resource blocks, wherein the virtual resource block is mapped to the sub-parts located in different positions in the range of each physical resource block. The number of resource elements allocated for the virtual resource block is constantly maintained.

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1. An apparatus for wireless communication, the apparatus comprising: a radio frequency (RF) unit for transmitting and receiving radio signals; anda processor coupled with the RF unit and configured for:selecting sub-parts, wherein each of the sub-parts is selected from different physical resource b

1. An apparatus for wireless communication, the apparatus comprising: a radio frequency (RF) unit for transmitting and receiving radio signals; anda processor coupled with the RF unit and configured for:selecting sub-parts, wherein each of the sub-parts is selected from different physical resource blocks (PRBs) and occupies different positions in each of the PRBs, each of the PRBs comprising consecutive orthogonal frequency division multiplexing (OFDM) symbols in time domain and consecutive subcarriers in frequency domain;mapping the sub-parts to virtual resource blocks (VRBs), wherein N sub-parts are mapped to one VRB, where N is an integer greater than 1; andtransmitting data using the VRBs,wherein at least one of the N sub-parts comprises a different number of reference signal-resource elements (RS-REs) compared to the remaining sub-parts among the N sub-parts, andthe N sub-parts are selected such that each of the mapped VRBs comprises a same number of RS-REs, andthe data is transmitted using the remaining resource elements except the RS-REs in the mapped VRBs; andwhen the data is transmitted by using the mapped VRBs, a same effective code rate is used for the mapped VRBs. 2. The apparatus of claim 1, wherein the N sub-parts are located in different positions in frequency domain in each physical resource block. 3. The apparatus of claim 1, wherein the N sub-parts are located in different positions in time domain in each physical resource block. 4. A method for allocating resources in a wireless communication system, the method comprising: selecting sub-parts, wherein each of the sub-parts is selected from different physical resource blocks (PRBs) and occupies different positions in each of the PRBs, each of the PRBs comprising consecutive orthogonal frequency division multiplexing (OFDM) symbols in time domain and consecutive subcarriers in frequency domain;mapping the sub-parts to virtual resource blocks (VRBs), wherein N sub-parts are mapped to one VRB, where N is an integer greater than 1; andtransmitting data using the VRBs, wherein at least one of the N sub-parts comprises a different number of reference signal-resource elements (RS-REs) compared to the remaining sub-parts among the N sub-parts, andthe N sub-parts are selected such that each of the mapped VRBs comprises a same number of RS-REs, andthe data is transmitted using the remaining resource elements except the RS-REs in the mapped VRBs; andwhen the data is transmitted by using the mapped VRBs, a same effective code rate is used for the mapped VRBs. 5. The method of claim 4, wherein the N sub-parts are located in different positions in frequency domain in each physical resource block. 6. The method of claim 4, wherein the N sub-parts are located in different positions in time domain in each physical resource block.