MCS update in group control channel

1. A method performed by a user equipment (UE) for wireless communication, the method comprising:

receiving an indicator of retransmission scheduling for a plurality of UEs;

determining, based on a modulation and coding scheme (MCS) update in the indicator, resources for receiving a retransmission, wherein the determining the resources includes identifying at least a particular resource block in which the UE received a prior transmission and identifying, based on the particular resource block in which the UE received the prior transmission, consecutive additional resource blocks associated with the MCS update for receiving the retransmission; and

receiving the retransmission on the determined resources.

2. The method of claim 1 , wherein the indicator includes a bitmap indicating which of the plurality of UEs reported a negative acknowledgement or a positive acknowledgement for a respective prior transmission.

3. The method of claim 1 , wherein the MCS update includes, for at least one UE that reported a negative acknowledgement for a respective prior transmission, a MCS delta with respect to a MCS of the respective prior transmission.

4. The method of claim 3 , further comprising determining the resources for receiving the retransmission based on the MCS delta and a position of the UE in a sequential ordering of the plurality of UEs.

5. The method of claim 3 , further comprising determining the resources for receiving the retransmission based on the MCS delta and a UE index included in the indicator.

6. The method of claim 1 , wherein the determining the resources comprises identifying resource blocks for receiving the retransmission based on a position of the UE in a sequential ordering of the plurality of UEs.

7. The method of claim 1 , wherein the indicator of retransmission scheduling is received on a group control channel.

8. An apparatus for wireless communications, comprising:

a processor;

memory coupled with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:

receive an indicator of retransmission scheduling for a plurality of UEs;

determine, based on a modulation and coding scheme (MCS) update in the indicator, resources for receiving a retransmission, wherein the determining the resources includes identifying at least a particular resource block in which the UE received a prior transmission and identifying, based on the particular resource block in which the UE received the prior transmission, consecutive additional resource blocks associated with the MCS update for receiving the retransmission; and

receive the retransmission on the determined resources.

9. The apparatus of claim 8 , wherein the indicator includes a bitmap indicating which of the plurality of UEs reported a negative acknowledgement or a positive acknowledgement for a respective prior transmission.

10. The apparatus of claim 8 , wherein the MCS update includes, for at least one UE that reported a negative acknowledgement for a respective prior transmission, a MCS delta with respect to a MCS of the respective prior transmission.

11. The apparatus of claim 10 , the instructions further operable to cause the apparatus to determine the resources for receiving the retransmission based on the MCS delta and a position of the UE in a sequential ordering of the plurality of UEs.

12. The apparatus of claim 10 , the instructions further operable to cause the apparatus to determine the resources for receiving the retransmission based on the MCS delta and a UE index included in the indicator.

13. The apparatus of claim 8 , wherein the determining the resources comprises identifying resource blocks for receiving the retransmission based on a position of the UE in a sequential ordering of the plurality of UEs.

14. The apparatus of claim 8 , wherein the indicator of retransmission scheduling is received on a group control channel.

15. A method for wireless communication, comprising:

receiving a negative acknowledgement report from at least one UE of a plurality of user equipments (UEs);

determining a modulation and coding scheme (MCS) update for the at least one UE;

assigning, for a retransmission, at least a particular resource block on which a prior transmission was transmitted to the at least one UE;

assigning, for the retransmission, consecutive additional resource blocks associated with the MCS update based on particular resource block on which the prior transmission was transmitted to the at least one UE;

generating an indicator of retransmission scheduling for the plurality of UEs, the indicator including the MCS update and assigned resource blocks for the at least one UE; and

transmitting the indicator.

16. The method of claim 15 , the determining the MCS update for the at least one UE is based on channel state feedback received from the at least one UE.

17. The method of claim 15 , wherein the indicator is transmitted on a group control channel for the plurality of UEs.

18. The method of claim 15 , wherein the indicator includes a bitmap indicating which of the plurality of UEs reported a negative acknowledgement or a positive acknowledgement of a respective prior transmission.

19. The method of claim 18 , wherein the respective prior transmission is scheduled based on semi-persistent scheduling.

20. The method of claim 15 , wherein the MCS update includes a MCS delta with respect to a MCS of the prior transmission to the at least one UE.

21. The method of claim 20 , wherein the MCS update further includes a UE index of the at least one UE.

22. The method of claim 15 , further comprising assigning resources for the retransmission to the at least one UE based at least in part on a position of the at least one UE in a sequential ordering of the plurality of UEs.

23. An apparatus for wireless communications, comprising:

a processor;

memory coupled with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:

receive a negative acknowledgement report from at least one UE of a plurality of user equipments (UEs);

determine a modulation and coding scheme (MCS) update for the at least one UE;

assign, for a retransmission, at least a particular resource block on which a prior transmission was transmitted to the at least one UE;

assign, for the retransmission, consecutive additional resource blocks associated with the MCS update based on particular resource block on which the prior transmission was transmitted to the at least one UE;

generate an indicator of retransmission scheduling for the plurality of UEs, the indicator including the MCS update for the at least one UE; and

transmit the indicator.

24. The apparatus of claim 23 , wherein the indicator includes a bitmap indicating which of the plurality of UEs reported a negative acknowledgement or a positive acknowledgement of a respective prior transmission.

25. The apparatus of claim 23 , wherein the MCS update includes a MCS delta with respect to a MCS of the prior transmission to the at least one UE.

26. The apparatus of claim 25 , wherein the MCS update further includes a UE index of the at least one UE.

27. The apparatus of claim 23 , the instructions further operable to cause the apparatus to assign resources for the retransmission to the at least one UE based at least in part on a position of the at least one UE in a sequential ordering of the plurality of UEs.