Method and apparatus for determining allocation of communication resources
A user equipment (UE) receives downlink data using resource blocks in a wireless mobile communication system. The UE receives downlink control information including resource allocation information and downlink data mapped to physical resource blocks (PRBs) based on the downlink control information. The resource allocation information indicates virtual resource block (VRB) allocations for the UE. Indexes of the PRBs to which the downlink data are mapped are determined based on a mapping relationship between virtual resource blocks (VRBs) and the PRBs. The mapping relationship is defined based on indexes of the VRBs which are mapped to the indexes of the PRBs for a first slot of a subframe and a second slot of the subframe. The indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap. The mapping relationship includes a transformation of VRB indexes based on a matrix.
1. A method for receiving downlink data using resource blocks at a user equipment (UE) in a wireless mobile communication system, the method comprising: receiving downlink control information including resource allocation information for the downlink data; and receiving the downlink data mapped to physical resource blocks (PRBs) based on the downlink control information, wherein the resource allocation information indicates virtual resource block (VRB) allocations for the user equipment, wherein indexes of the PRBs to which the downlink data are mapped are determined based on a mapping relationship between virtual resource blocks (VRBs) and the PRBs, wherein the mapping relationship is defined based on indexes of the VRBs which are mapped to the indexes of the PRBs for a first slot of a subframe and a second slot of the subframe, and wherein the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap, wherein the mapping relationship includes a transformation of VRB indexes based on a matrix, wherein a number, R, of rows of the matrix is given as: R=┌N DVRB /C−M RBG )┐·M RBG where NDVRB is a number of consecutive indexes of VRBs, C is a number of columns in the matrix, and MRBG is a number of consecutive PRBs that constitute a resource block group (RBG).
2. The method according to claim 1 , wherein a number, N null , of nulls in the matrix is given as:
N null =┌N DVRB /( C·M RBG )┐· C·M RBG −N DVRB =C·R−N DVRB .
3. The method according to claim 2 , wherein C is equal to 4.
4. The method according to claim 1 , wherein the indexes of the VRBs are written row-by-row in the matrix to be read out from the matrix column-by-column.
5. A user equipment for receiving downlink data using resource blocks in a wireless mobile communication system, the user equipment comprising: a processor configured to control an operation of the user equipment; and a memory accessible by the processor, wherein the processor is configured to receive downlink control information including resource allocation information for the downlink data and to receive the downlink data mapped to physical resource blocks (PRBs) based on the downlink control information, wherein the resource allocation information indicates virtual resource block (VRB) allocations for the user equipment, wherein indexes of the PRBs to which the downlink data are mapped are determined based on a mapping relationship between virtual resource blocks (VRBs) and the PRBs, wherein the mapping relationship is defined based on indexes of the VRBs which are mapped to the indexes of the PRBs for a first slot of a subframe and a second slot of the subframe, and wherein the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap, wherein the mapping relationship includes a transformation of VRB indexes based on a matrix, wherein a number, R, of rows of the matrix is given (as: R=┌N DVRP /(C·M RBG )┐·M RBG where NDVRB is a number of consecutive indexes of VRBs, C is a number of columns in the matrix, and MRBG is a number of consecutive PRBs that constitute a resource block group (RBG).
6. The user equipment according to claim 5 , wherein a number, N null , of nulls in the matrix is given as:
N null =┌N DVRB /( C·M RBG )┐· C·M RBG −N DVRB =C·R−N DVRB .
7. The user equipment according to claim 6 , wherein C is equal to 4.
8. The user equipment according to claim 5 , wherein the indexes of the VRBs are written row-by-row in the matrix to be read out from the matrix column-by-column.