Frequency hopping design for large bandwidth allocations in eMTC

1. A method for wireless communications by user equipment (UE), comprising:

receiving a resource allocation for uplink transmission in at least one subframe, wherein the resource allocation includes a set of allocated subframes and configuration information for frequency hopping;

determining allocated frequency hopped resources, within a system bandwidth, for each subframe of the set of allocated subframes based on the configuration information; and

if the determined allocated frequency hopped resources include resources around the center resource block (RB) of the system bandwidth:

including the center RB in addition to the determined allocated frequency hopped resources;

removing a last RB from the determined allocated frequency hopped resources; and

dropping the uplink transmission in at least one subframe if the allocated frequency hopped resources in the subframe comprise non-contiguous RBs after including the center RB and removing the last RB.

2. The method of claim 1 , wherein:

the system bandwidth comprises one or more of narrowband regions, the center RB, and edge RBs on either side of the system bandwidth;

the center RB or edge RBs are in the one or more narrowband regions or outside the one or more narrowband regions; and

each narrowband region comprises 6 contiguous RBs.

3. The method of claim 2 , wherein the resource allocation further includes a starting narrowband RB index S within the one or more narrowband regions and a number of narrowband RBs N within the one or more narrowband regions.

4. The method of claim 3 , wherein:

determining the allocated frequency hopped resources comprises determining the starting narrowband RB index S for each subframe in the set of allocated subframes based on the configuration information; and

the allocated frequency hopped resources for a particular subframe includes RBs in the narrowband region with the narrowband RB index from the set {S modulo M, (S+1) modulo M, . . . , (S+N−1) modulo M} where M is a total number of RBs in the one or more narrowband regions.

5. The method of claim 1 , wherein:

the UE is configured to transmit within a maximum of 5 MHz bandwidth or a 20 MHz bandwidth.

6. The method of claim 1 , wherein dropping the uplink transmission comprises:

refraining from transmitting a physical uplink shared channel (PUSCH) transmission in the at least one subframe.

7. An apparatus for wireless communications, comprising:

means for receiving a resource allocation for uplink transmission in at least one subframe, wherein the resource allocation includes a set of allocated subframes and configuration information for frequency hopping;

means for determining allocated frequency hopped resources, within a system bandwidth, for each subframe of the set of allocated subframes based on the configuration information;

means for including a center resource block (RB) of the system bandwidth in addition to the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB;

means for removing a last RB from the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB; and

means for dropping the uplink transmission in at least one subframe if the allocated frequency hopped resources in the subframe comprise non-contiguous RBs after including the center RB and removing the last RB.

8. The apparatus of claim 7 , wherein:

the system bandwidth comprises one or more of narrowband regions, the center RB, and edge RBs on either side of the system bandwidth;

the center RB or edge RBs are in the one or more narrowband regions or outside the one or more narrowband regions; and

each narrowband region comprises 6 contiguous RBs.

9. The apparatus of claim 8 , wherein the resource allocation further includes a starting narrowband RB index S within the one or more narrowband regions and a number of narrowband RBs N within the one or more narrowband regions.

10. The apparatus of claim 9 , wherein:

means for determining the allocated frequency hopped resources comprises means for determining the starting narrowband RB index S for each subframe in the set of allocated subframes based on the configuration information; and

the allocated frequency hopped resources for a particular subframe includes RBs in the narrowband region with the narrowband RB index from the set {S modulo M, (S+1) modulo M, (S+N−1) modulo M} where M is a total number of RBs in the one or more narrowband regions.

11. The apparatus of claim 7 , wherein:

the apparatus is configured to transmit within a maximum of 5 MHz bandwidth or a 20 MHz bandwidth.

12. The apparatus of claim 7 , wherein dropping the uplink transmission comprises:

refraining from transmitting a physical uplink shared channel (PUSCH) transmission in the at least one subframe.

13. An apparatus for wireless communications, comprising:

a receiver configured to receive a resource allocation for uplink transmission in at least one subframe, wherein the resource allocation includes a set of allocated subframes and configuration information for frequency hopping; and

at least one processor coupled with a memory and configured to determine:

allocate frequency hopped resources, within a system bandwidth, for each subframe of the set of allocated subframes based on the configuration information;

include a center resource block (RB) of the system bandwidth in addition to the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB;

remove a last RB from the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB; and

drop the uplink transmission in at least one subframe if the allocated frequency hopped resources in the subframe comprise non-contiguous RBs after including the center RB and removing the last RB.

14. The apparatus of claim 13 , wherein:

the system bandwidth comprises one or more of narrowband regions, the center RB, and edge RBs on either side of the system bandwidth;

the center RB or edge RBs are in the one or more narrowband regions or outside the one or more narrowband regions; and

each narrowband region comprises 6 contiguous RBs.

15. The apparatus of claim 14 , wherein the resource allocation further includes a starting narrowband RB index S within the one or more narrowband regions and a number of narrowband RBs N within the one or more narrowband regions.

16. The apparatus of claim 15 , wherein:

the at least one processor is configured to determine the starting narrowband RB index S for each subframe in the set of allocated subframes based on the configuration information; and

the allocated frequency hopped resources for a particular subframe includes RBs in the narrowband region with the narrowband RB index from the set {S modulo M, (S+1) modulo M, (S+N−1) modulo M} where M is a total number of RBs in the one or more narrowband regions.

17. The apparatus of claim 13 , wherein the apparatus is configured to transmit within a maximum of 5 MHz bandwidth or a 20 MHz bandwidth.

18. The apparatus of claim 13 , wherein dropping the uplink transmission comprises refraining from transmitting a physical uplink shared channel (PUSCH) transmission in the at least one subframe.

19. A non-transitory computer readable medium having computer executable code stored thereon for wireless communications, comprising:

code for receiving a resource allocation for uplink transmission in at least one subframe, wherein the resource allocation includes a set of allocated subframes and configuration information for frequency hopping;

code for determining allocated frequency hopped resources, within a system bandwidth, for each subframe of the set of allocated subframes based on the configuration information;

code for including a center resource block (RB) of the system bandwidth in addition to the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB;

code for removing a last RB from the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB; and

code for dropping the uplink transmission in at least one subframe if the allocated frequency hopped resources in the subframe comprise non-contiguous RBs after including the center RB and removing the last RB.

20. The non-transitory computer readable medium of claim 19 , wherein:

the system bandwidth comprises one or more of narrowband regions, the center RB, and edge RBs on either side of the system bandwidth;

the center RB or edge RBs are in the one or more narrowband regions or outside the one or more narrowband regions; and

each narrowband region comprises 6 contiguous RBs.

21. The non-transitory computer readable medium of claim 20 , wherein the resource allocation further includes a starting narrowband RB index S within the one or more narrowband regions and a number of narrowband RBs N within the one or more narrowband regions.

22. The non-transitory computer readable medium of claim 21 , wherein:

code for determining the allocated frequency hopped resources comprises code for determining the starting narrowband RB index S for each subframe in the set of allocated subframes based on the configuration information; and

the allocated frequency hopped resources for a particular subframe includes RBs in the narrowband region with the narrowband RB index from the set {S modulo M, (S+1) modulo M, (S+N−1) modulo M} where M is a total number of RBs in the one or more narrowband regions.

23. The non-transitory computer readable medium of claim 19 , wherein the apparatus is configured to transmit within a maximum of 5 MHz bandwidth or a 20 MHz bandwidth.

24. The non-transitory computer readable medium of claim 19 , wherein dropping the uplink transmission comprises refraining from transmitting a physical uplink shared channel (PUSCH) transmission in the at least one subframe.