Enabling multi-cluster transmissions

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

identifying a transmission power requirement associated with a vehicle-based communication network when the UE is in communications with a cellular communications network;

receiving an indication of a configuration parameter for multi-cluster communications in the vehicle-based communication network, wherein the configuration parameter is based at least in part on the identified transmission power requirement; and

transmitting a multi-cluster transmission in a set of available cluster resources based at least in part on the configuration parameter and a received energy level associated with each available cluster resource in the set of available cluster resources, wherein the multi-cluster transmission comprises one or both of a scheduling assignment (SA) message or a data message.

2. The method of claim 1 , wherein the transmission power requirement is based at least in part on a parameter obtained from a base station.

3. The method of claim 1 , further comprising:

identifying the transmission power requirement based at least in part on a location parameter of the UE when there is a failure to communicate with the cellular communications network.

4. The method of claim 1 , further comprising:

receiving a message from a base station that conveys the indication of the configuration parameter, wherein transmitting the multi-cluster transmission is based at least in part on the configuration parameter.

5. The method of claim 4 , wherein the message is received during a radio resource control (RRC) setup exchange.

6. The method of claim 4 , wherein the indication of the configuration parameter identifies the set of available cluster resources.

7. The method of claim 6 , wherein the set of available cluster resources comprises a plurality of clusters, each cluster of the plurality of clusters comprising a common bandwidth parameter.

8. The method of claim 4 , wherein the indication of the configuration parameter is received via a broadcast transmission from the base station.

9. The method of claim 1 , further comprising:

identifying the configuration parameter based at least in part on preconfigured information, wherein transmitting the multi-cluster transmission is based at least in part on the configuration parameter.

10. The method of claim 9 , further comprising:

accessing the preconfigured information based at least in part on the configuration parameter.

11. The method of claim 1 , further comprising:

ranking one or more clusters associated with the set of available cluster resources according to a received energy level associated with each cluster; and

selecting a cluster resource from a subset of available clusters based at least in part on the ranking for each cluster, wherein the multi-cluster transmission is transmitted using the selected cluster resource.

12. The method of claim 11 , wherein the ranking of each cluster is performed for a subframe.

13. The method of claim 11 , further comprising:

identifying a subset count identifying a number of clusters in the subset of available clusters being used for the multi-cluster transmission; and

using at least one of an indication received from a base station or a preconfigured indication to select the cluster resource.

14. The method of claim 1 , further comprising:

transmitting the SA message as an indication of a cluster resource selected from a subset of available clusters, wherein the multi-cluster transmission is transmitted using the selected cluster resource; and

transmitting the data message as the multi-cluster transmission.

15. The method of claim 14 , wherein the SA message and the data message are transmitted at different transmit power levels.

16. The method of claim 15 , further comprising:

transmitting the SA message and the data message at different transmit power levels based at least in part on a parameter received from a base station during a radio resource configuration (RRC) setup procedure.

17. The method of claim 14 , wherein the SA message and the data message are transmitted at a same transmit power level.

18. The method of claim 14 , further comprising:

transmitting the SA message and at least a portion of the data message in a same cluster.

19. The method of claim 14 , further comprising:

selecting the cluster resource for transmitting the SA message based at least in part on the configuration parameter, wherein transmitting the multi-cluster transmission is based at least in part on the configuration parameter.

20. The method of claim 14 , wherein the SA message is transmitted in any cluster within the selected cluster resource.

21. An apparatus for wireless communications, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

identify a transmission power requirement associated with a vehicle-based communication network when the UE is in communications with a cellular communications network;

receive an indication of a configuration parameter for multi-cluster communications in the vehicle-based communication network, wherein the configuration parameter is based at least in part on the identified transmission power requirement; and

transmit a multi-cluster transmission in a set of available cluster resources based at least in part on the configuration parameter and a received energy level associated with each available cluster resource in the set of available cluster resources, wherein the multi-cluster transmission comprises one or both of a scheduling assignment (SA) message or a data message.

22. The apparatus of claim 21 , wherein the transmission power requirement is based at least in part on a parameter obtained from a base station.

23. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

identify a transmission power requirement based at least in part on a location parameter of the UE when there is a failure to communicate with the cellular communications network.

24. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

receive a message from a base station that conveys the indication of the configuration parameter, wherein transmitting the multi-cluster transmission is based at least in part on the configuration parameter.

25. The apparatus of claim 24 , wherein the indication of the configuration parameter is received via a broadcast transmission from the base station.

26. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

identify the configuration parameter based at least in part on preconfigured information, wherein transmitting the multi-cluster transmission is based at least in part on the configuration parameter.

27. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

rank one or more clusters associated with the set of available cluster resources according to a received energy level associated with each cluster; and

select a cluster resource from a subset of available clusters based at least in part on the ranking for each cluster, wherein the multi-cluster transmission is transmitted using the selected cluster resource.

28. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

transmit the SA message as an indication of a cluster resource selected from a subset of available clusters, wherein the multi-cluster transmission is transmitted using the selected cluster resource; and

transmit the data message as the multi-cluster transmission.

29. An apparatus for wireless communication, the apparatus comprising:

means for identifying a transmission power requirement associated with a vehicle-based communication network when the UE is in communications with a cellular communications network;

means for receiving an indication of a configuration parameter for multi-cluster communications in the vehicle-based communication network, wherein the configuration parameter is based at least in part on the identified transmission power requirement; and

means for transmitting a multi-cluster transmission in a set of available cluster resources based at least in part on the configuration parameter and a received energy level associated with each available cluster resource in the set of available cluster resources, wherein the multi-cluster transmission comprises one or both of a scheduling assignment (SA) message or a data message.

30. A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable to:

identify a transmission power requirement associated with a vehicle-based communication network when the UE is in communications with a cellular communications network;

receive an indication of a configuration parameter for multi-cluster communications in the vehicle-based communication network, wherein the configuration parameter is based at least in part on the identified transmission power requirement; and

transmit a multi-cluster transmission in a set of available cluster resources based at least in part on the configuration parameter and a received energy level associated with each available cluster resource in the set of available cluster resources, wherein the multi-cluster transmission comprises one or both of a scheduling assignment (SA) message or a data message.