Method and apparatus for determining numerology bandwidth in a wireless communication system

1. A method for determining numerology bandwidth, the method comprising:

receiving, by a user equipment (UE), information for a first numerology associated with a first subcarrier spacing, wherein the information comprises a first frequency location and a first bandwidth for the first numerology for a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH);

detecting a physical downlink control channel (PDCCH), wherein the PDCCH is associated with the PDSCH or the PUSCH;

deriving, by the UE, a first bandwidth portion based on the first frequency location and the first bandwidth for the first numerology; and

deriving, by the UE, a resource allocation scheduled by a network and carried by the PDCCH for the PDSCH or the PUSCH for the first numerology within the first bandwidth portion based on the PDCCH, the first frequency location and the first bandwidth, wherein the resource allocation within the first bandwidth portion is done via a bit map indicating which resource unit within the first bandwidth portion is allocated for the UE.

2. The method of claim 1 , further comprising:

configuring, by the UE, a system bandwidth.

3. The method of claim 1 , comprising:

receiving, by the UE, second information for a second numerology associated with a second subcarrier spacing, wherein the second information comprises a second frequency location and a second bandwidth for the second numerology for a second PDSCH or a second PUSCH;

detecting a second PDCCH, wherein the second PDCCH is associated with the second PDSCH or the second PUSCH;

deriving, by the UE, a second bandwidth portion based on the second frequency location and the second bandwidth for the second numerology; and

deriving, by the UE, a second resource allocation scheduled by a second network and carried by the second PDCCH for the second PDSCH or the second PUSCH for the second numerology within the second bandwidth portion based on the second PDCCH, the second frequency location and the second bandwidth.

4. The method of claim 1 , wherein the first frequency location is an index of a resource block.

5. The method of claim 1 , further comprising:

receiving, by the UE, second information for a second numerology associated with a second subcarrier spacing, wherein the second information comprises a second frequency location and a second bandwidth for the second numerology and deriving, by the UE, a second resource allocation for a second PDSCH or a second PUSCH for the second numerology within a second bandwidth portion based on the PDCCH, the second frequency location and the second bandwidth.

6. The method of claim 1 , wherein the first frequency location is an index of a resource block with a central frequency within the first bandwidth portion.

7. The method of claim 6 , the first bandwidth portion is derived from the first frequency location and the first bandwidth.

8. The method of claim 1 , wherein the first bandwidth and the first frequency location is configured by UE-specific RRC message.

9. The method of claim 1 , wherein the first bandwidth and the first frequency location is indicated by a physical control channel.

10. The method of claim 1 , wherein the first numerology is indicated by a physical control channel.

11. The method of claim 1 , wherein the first bandwidth is a maximum bandwidth for the first numerology.

12. The method of claim 1 , wherein the first bandwidth is a maximum bandwidth that the UE is able to receive for the first numerology.

13. A User Equipment (UE) capable of determining numerology bandwidth, comprising:

a control circuit;

a processor installed in the control circuit; and

a memory installed in the control circuit and coupled to the processor;

wherein the processor is configured to execute a program code stored in the memory to:

receive information for a first numerology associated with a first subcarrier spacing, wherein the information comprises a first frequency location and a first bandwidth for the first numerology for a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH);

detect a physical downlink control channel (PDCCH), wherein the PDCCH is associated with the PDSCH or the PUSCH;

derive a first bandwidth portion based on the first frequency location and the first bandwidth for the first numerology; and

derive a resource allocation scheduled by a network and carried by the PDCCH for the PDSCH or the PUSCH for the first numerology within the first bandwidth portion based on the PDCCH, the first frequency location and the first bandwidth, wherein the resource allocation within the first bandwidth portion is done via a bit map indicating which resource unit within the first bandwidth portion is allocated for the UE.

14. The UE of claim 13 , wherein the UE configures a system bandwidth.

15. The UE of claim 14 , wherein the system bandwidth is larger than the first bandwidth.

16. The UE of claim 13 , wherein the processor is further configured to execute a second program code stored in the memory to:

receive second information for a second numerology associated with a second subcarrier spacing, wherein the second information comprises a second frequency location and a second bandwidth for the second numerology and deriving, by the UE, a second resource allocation for a second PDSCH or a second PUSCH for the second numerology within a second bandwidth portion based on the PDCCH, the second frequency location and the second bandwidth.

17. The UE of claim 13 , wherein the first bandwidth is a configured bandwidth for the first numerology.