Method and apparatus for transmitting and receiving system information

1. A method of transmitting system information by a base station, the method comprising:

configuring a system bandwidth including two or more physical resource blocks with one or more subbands defined by two or more physical resource blocks to enable at least one remaining physical resource block to be located in a center of the system bandwidth; and

transmitting the system information to a predetermined user equipment (UE) using the subband,

wherein:

the configuring the system bandwidth comprises configuring the system bandwidth with └N PRB /6┘ subbands when the system bandwidth includes N PRB physical resource blocks, where └N PRB /6┘ indicates a quotient of N PRB /6; and

the transmitting the system information comprises transmitting the system information to the predetermined UE using one of the └N PRB /6┘ subbands; and

wherein a number of remaining physical resource blocks which are not included in the └N PRB /6┘ subbands is determined by subtracting a product of └N PRB /6┘ and 6 from N PRB , and at least one of the determined number of remaining physical resource blocks is located in the center of the system bandwidth,

wherein the subband is defined by six physical resource blocks,

wherein, when the system bandwidth is 3 MHz, 5 MHz, and 15 MHz, the system bandwidth is configured with 2 subbands, 4 subbands, and 12 subbands, respectively, and the number of remaining physical resource blocks is 3, 1, and 3, respectively;

when the number of remaining physical resource blocks is 1, the remaining physical resource block is located in the center of the system bandwidth; and

when the number of remaining physical resource blocks is an odd number greater than 1, at least one of the remaining physical resource blocks is located in the center of the system bandwidth.

2. The method as claimed in claim 1 , wherein, when the system bandwidth is 5 MHz, the physical resource block includes 12 15 KHz-subcarriers, and the system bandwidth includes 25 physical resource blocks;

the system bandwidth includes 4 subbands, and the number of remaining physical resource blocks is 1; and

the system bandwidth is configured with 4 subbands to enable the remaining physical resource block to be located in the center of the system bandwidth.

3. The method as claimed in claim 1 , wherein, when the system bandwidth is 5 MHz, the physical resource block includes 12 15 KHz-subcarriers, and the system bandwidth includes 25 physical resource blocks numbered from 0 to 24;

the system bandwidth includes four subbands, the subbands including physical resource blocks numbered from 0 to 5, physical resource blocks numbered from 6 to 11, physical resource blocks numbered from 13 to 18, and physical resource blocks numbered from 19 to 24, respectively, and one remaining physical resource block is located in a physical resource block numbered 12.

4. The method as claimed in claim 1 , wherein the remaining physical resource block overlaps physical resource blocks in which a physical broadcast channel (PBCH), a primary synch signal (PSS), or an secondary synch signal (SSS) is transmitted.

5. A method of receiving system information by a user equipment (UE), the method comprising:

receiving the system information from a base station using one or more subbands defined by two or more physical resource blocks, wherein a system bandwidth is configured with two or more physical resource blocks to enable at least one remaining physical resource block to be located in a center of the system bandwidth; and

decoding the system information,

wherein the receiving the system information comprises:

configuring the system bandwidth with └N PRB /6┘ subbands when the system bandwidth includes N PRB physical resource blocks, where └N PRB /6┘ indicates a quotient of N PRB /6; and

receiving the system information from the base station using one of the └N PRB /6┘ subbands; and

wherein a number of remaining physical resource blocks which do not belong to the └N PRB /6┘ subbands is determined by subtracting a product of └N PRB /6┘ and 6 from N PRB , and at least one of the determined number of remaining physical resource blocks is located in the center of the system bandwidth,

wherein the subband is defined by six physical resource blocks,

wherein, when the system bandwidth is 3 MHz, 5 MHz, and 15 MHz, the system bandwidth is configured with 2 subbands, 4 subbands, and 12 subbands, respectively, and the number of remaining physical resource blocks is 3, 1, and 3, respectively;

when the number of remaining physical resource blocks is 1, the remaining physical resource block is located in the center of the system bandwidth; and

when the number of remaining physical resource blocks is an odd number greater than 1, at least one of the remaining physical resource blocks is located in the center of the system bandwidth.

6. The method as claimed in claim 5 , wherein, when the system bandwidth is 5 MHz, the physical resource block includes 12 15 KHz-subcarriers, and the system bandwidth includes 25 physical resource blocks;

the system bandwidth includes 4 subbands, and the number of remaining physical resource blocks is 1; and

the system bandwidth is configured with 4 subbands to enable the remaining physical resource block to be located in the center of the system bandwidth.

7. The method as claimed in claim 5 , wherein, when the system bandwidth is 5 MHz, the physical resource block includes 12 15 KHz-subcarriers, and the system bandwidth includes 25 physical resource blocks numbered from 0 to 24;

the system bandwidth includes four subbands, the subbands including physical resource blocks numbered from 0 to 5, physical resource blocks numbered from 6 to 11, physical resource blocks numbered from 13 to 18, and physical resource blocks numbered from 19 to 24, respectively, and one remaining physical resource block is located in a physical resource block numbered 12.

8. The method as claimed in claim 5 , wherein the remaining physical resource block overlaps physical resource blocks in which a physical broadcast channel (PBCH), a primary synch signal (PSS), or an secondary synch signal (SSS) is transmitted.

9. A user equipment (UE) that receives system information, the UE comprising:

a receiver configured to receive system information from a base station using one or more subbands defined by two or more physical resource blocks, wherein a system bandwidth is configured with two or more physical resource blocks to enable at least one remaining physical resource block to be located in a center of the system bandwidth; and

a controller configured to decode the received system information,

wherein the receiver is configured to:

configure the system bandwidth with └N PRB /6┘ subbands when the system bandwidth includes N PRB physical resource blocks, where └N PRB /6┘ indicates a quotient of N PRB /6; and

receive the system information from the base station using one of the └N PRB /6┘ subbands; and

wherein a number of remaining physical resource blocks which do not belong to the └N PRB /6┘ subbands is determined by subtracting a product of └N PRB /6┘ and 6 from N PRB , and at least one of the determined number of remaining physical resource blocks is located in the center of the system bandwidth,

wherein the subband is defined by 6 physical resource blocks,

wherein, when the system bandwidth is 3 MHz, 5 MHz, and 15 MHz, the system bandwidth is configured with 2 subbands, 4 subbands, and 12 subbands, respectively, and the number of remaining physical resource blocks is 3, 1, and 3, respectively;

when the number of remaining physical resource blocks is 1, the remaining physical resource block is located in the center of the system bandwidth; and

when the number of remaining physical resource blocks is an odd number greater than 1, at least one of the remaining physical resource blocks is located in the center of the system bandwidth.

10. The UE as claimed in claim 9 , wherein, when the system bandwidth is 5 MHz, the physical resource block includes 12 15 KHz-subcarriers, and the system bandwidth includes 25 physical resource blocks;

the system bandwidth includes 4 subbands, and the number of remaining physical resource blocks is 1; and

the system bandwidth is configured with 4 subbands to enable the remaining physical resource block to be located in the center of the system bandwidth.

11. The UE as claimed in claim 9 , wherein, when the system bandwidth is 5 MHz, the physical resource block includes 12 15 KHz subcarriers, and the system bandwidth includes 25 physical resource blocks numbered from 0 to 24;

the system bandwidth includes four subbands, the subbands including physical resource blocks numbered from 0 to 5, physical resource blocks numbered from 6 to 11, physical resource blocks numbered from 13 to 18, and physical resource blocks numbered from 19 to 24, respectively, and one remaining physical resource block is located in a physical resource block numbered 12.

12. The UE as claimed in claim 9 , wherein the remaining physical resource block overlaps physical resource blocks in which a physical broadcast channel (PBCH), a primary synch signal (PSS), or an secondary synch signal (SSS) is transmitted.