Method and apparatus for implementing nonstandard bandwidth as well as network device comprising the apparatus

1. A method for implementing a nonstandard bandwidth at a network device, the method comprising:

determining a first amount of physical resource blocks (PRBs) available in the nonstandard bandwidth;

determining a second amount of PRBs available in a standard bandwidth corresponding to the nonstandard bandwidth; and

determining a central frequency shift of the nonstandard bandwidth relative to the standard bandwidth, based at least on the first and second amounts, wherein determining the central frequency shift comprises:

calculating a third amount of one or more PRBs that are blocked on the edge(s) of the standard bandwidth, the third amount is based on a difference between the second and first amounts; and

setting the central frequency shift of the nonstandard bandwidth relative to the standard bandwidth based on the third amount.

2. The method according to claim 1 , wherein determining the central frequency shift comprises:

when the third amount is even, setting the central frequency shift as zero; and

when the third amount is odd, setting the central frequency shift as a half of a PRB bandwidth, or an opposite sign number of a half of a PRB bandwidth.

3. The method according to claim 1 , wherein the central frequency shift is determined based further on a resource block group (RBG) size corresponding to the nonstandard bandwidth.

4. The method according to claim 3 , wherein determining the central frequency shift further comprises:

calculating a fourth amount of one or more full RBGs available in the third amount of PRBs;

calculating a first remainder, for a division of the third amount by the RBG size;

calculating a second remainder, for a division of the second amount by the RBG size; and

setting the central frequency shift based on the fourth amount, the first and second remainders.

5. The method according to claim 4 , wherein setting the central frequency shift comprises:

when the fourth amount is even and the first remainder is less than or equal to the second remainder, setting the central frequency shift as the first remainder multiplied by a half of a PRB bandwidth;

when the fourth amount is even and the first remainder is greater than the second remainder, setting the central frequency shift as an opposite sign number of the first remainder multiplied by a half of a PRB bandwidth;

when the fourth amount is odd and the first remainder is less than or equal to the second remainder, setting the central frequency shift as a half of a PRB bandwidth multiplied by a difference between the first remainder and the RBG size; and

when the fourth amount is odd and the first remainder is greater than the second remainder, setting the central frequency shift as an opposite sign number of a half of a PRB bandwidth multiplied by a sum of the first remainder and the RBG size.

6. The method according to claim 1 , wherein determining the first amount comprises:

selecting a bandpass filter corresponding to the nonstandard bandwidth;

calculating a passband bandwidth of the bandpass filter; and

calculating the first amount based on the passband bandwidth.

7. An apparatus for implementing a nonstandard bandwidth at a network device, the apparatus comprising:

a processor; and

a memory, the memory containing instructions executable by the processor to operate the apparatus to:

determine a first amount of physical resource blocks (PRBs) available in the nonstandard bandwidth;

determine a second amount of PRBs available in a standard bandwidth corresponding to the nonstandard bandwidth; and

determine a central frequency shift of the nonstandard bandwidth relative to the standard bandwidth, based at least on the first and second amounts, wherein determining the central frequency shift comprises:

calculating a third amount of one or more PRBs that are blocked on the edge(s) of the standard bandwidth, the third amount is based on a difference between the second and first amounts; and

setting the central frequency shift of the nonstandard bandwidth relative to the standard bandwidth based on the third amount.

8. The apparatus according to claim 7 , wherein the instructions are executable by the processor to operate the apparatus to determine the central frequency shift by:

when the third amount is even, setting the central frequency shift as zero; and

when the third amount is odd, setting the central frequency shift as a half of a PRB bandwidth, or an opposite sign number of a half of a PRB bandwidth.

9. The apparatus according to claim 7 , wherein the instructions are executable by the processor to operate the apparatus to determine the central frequency shift based further on a resource block group (RBG) size corresponding to the nonstandard bandwidth.

10. The apparatus according to claim 9 , wherein the instructions are executable by the processor to operate the apparatus to determine the central frequency shift further by:

calculating a fourth amount of one or more full RBGs available in the third amount of PRBs;

calculating a first remainder, for a division of the third amount by the RBG size;

calculating a second remainder, for a division of the second amount by the RBG size; and

setting the central frequency shift based on the fourth amount, the first and second remainders.

11. The apparatus according to claim 10 , wherein the instructions are executable by the processor to operate the apparatus to set the central frequency shift by:

when the fourth amount is even and the first remainder is less than or equal to the second remainder, setting the central frequency shift as the first remainder multiplied by a half of a PRB bandwidth;

when the fourth amount is even and the first remainder is greater than the second remainder, setting the central frequency shift as an opposite sign number of the first remainder multiplied by a half of a PRB bandwidth;

when the fourth amount is odd and the first remainder is less than or equal to the second remainder, setting the central frequency shift as a half of a PRB bandwidth multiplied by a difference between the first remainder and the RBG size; and

when the fourth amount is odd and the first remainder is greater than the second remainder, setting the central frequency shift as an opposite sign number of a half of a PRB bandwidth multiplied by a sum of the first remainder and the RBG size.

12. The apparatus according to claim 7 , wherein the instructions are executable by the processor to operate the apparatus to determine the first amount by:

selecting a bandpass filter corresponding to the nonstandard bandwidth;

calculating a passband bandwidth of the bandpass filter; and

calculating the first amount based on the passband bandwidth.

13. The apparatus according to claim 7 , wherein the apparatus is included in a radio unit (RU) of the network device.

14. The apparatus according to claim 7 , wherein the apparatus is included in a digital unit (DU) of the network device.

15. A network device comprising:

a radio admission control (RAC) configured to obtain a bandwidth configuration from an operation administration and maintenance (OAM);

a radio unit (RU) comprising the apparatus according to claim 7 , wherein the RU is further configured to obtain the bandwidth configuration from the RAC and feedback information about the determined central frequency shift and the first amount of PRBs to the RAC, and wherein the RAC is further configured to, based on the information feedback, determine one or more PRBs that are blocked on the edge(s) of the standard bandwidth; and

a digital unit (DU) configured to obtain information about the one or more PRBs and the central frequency shift from the RAC and determine, based on the obtained information, which PRB(s) are to be blocked for resource scheduling.