Sidelink communication across frequency bands

1. A method for wireless communication at a first wireless communication device, the method comprising:

establishing a first sidelink with a second wireless communication device on a first frequency band comprising a first carrier frequency;

establishing, at least in part utilizing the first sidelink, a second sidelink with the second wireless communication device on a second frequency band comprising a second carrier frequency;

exchanging synchronization reference information with the second wireless communication device to synchronize timing on the first sidelink and the second sidelink, wherein the exchanged synchronization reference information indicates any timing offset between respective slot boundaries of the first and second sidelinks;

transmitting sidelink control information (SCI) based on the timing offset on the first sidelink, the SCI comprising an indicator that the SCI is scheduling data to be transmitted from the first wireless communication device to the second wireless communication device on the second sidelink; and

transmitting the data to the second wireless communication device on the second sidelink.

2. The method of claim 1 , further comprising:

receiving feedback information corresponding to the data from the second wireless communication device on the first sidelink or the second sidelink.

3. The method of claim 1 , further comprising:

aligning respective slot boundaries of the first and second sidelinks based on the timing offset.

4. The method of claim 1 , further comprising:

scheduling the SCI and the data based on the timing offset.

5. The method of claim 1 , further comprising:

generating the SCI comprising at least one of an identifier of the second frequency band on which the data is to be transmitted or resource information indicating resources on which the data is to be transmitted.

6. The method of claim 5 , further comprising:

generating the resource information for the second sidelink based on at least one of first sidelink parameters associated with the first sidelink or second sidelink parameters associated with the second sidelink.

7. The method of claim 6 , wherein the first sidelink parameters comprise a first subcarrier spacing and a first bandwidth part associated with the first sidelink and the second sidelink parameters comprise a second subcarrier spacing and a second bandwidth part associated with the second sidelink.

8. The method of claim 1 , further comprising:

communicating with the second wireless communication device on the first frequency band utilizing an omni-directional beam; and

communicating with the second wireless communication device on the second frequency band utilizing at least one directional beam.

9. The method of claim 1 , wherein the first frequency band comprises a sub 5 gigahertz frequency band and the second frequency band comprises a millimeter wave frequency band.

10. The method of claim 1 , wherein establishing the second sidelink with the second wireless communication device further comprises:

aggregating the second carrier frequency and at least a third carrier frequency within the second frequency band to form the second sidelink.

11. The method of claim 1 , further comprising:

transmitting reference signal configuration information to the second wireless communication device on the first sidelink, wherein the reference signal configuration information indicates a configuration of one or more reference signals to be transmitted on the second sidelink;

transmitting the one or more reference signals on the second sidelink; and

receiving a channel state information (CSI) report generated based on the one or more reference signals from the second wireless communication device on the first sidelink or the second sidelink.

12. The method of claim 1 , further comprising:

establishing a third sidelink with a third wireless communication device on a third carrier frequency within the second frequency band.

13. The method of claim 1 , wherein the SCI further comprises synchronization information.

14. A first wireless communication device, comprising:

a processor;

a wireless transceiver communicatively coupled to the processor; and

a memory communicatively coupled to the processor, wherein the processor and the memory are configured to:

establish a first sidelink with a second wireless communication device on a first frequency band comprising a first carrier frequency via the wireless transceiver;

establish, at least in part utilizing the first sidelink, a second sidelink with the second wireless communication device on a second frequency band comprising a second carrier frequency via the wireless transceiver;

exchange synchronization reference information with the second wireless communication device to synchronize timing on the first sidelink and the second sidelink, wherein the exchanged synchronization reference information indicates any timing offset between respective slot boundaries of the first and second sidelinks;

transmit sidelink control information (SCI) based on the timing offset on the first sidelink, the SCI comprising an indicator that the SCI is scheduling data to be transmitted from the first wireless communication device to the second wireless communication device on the second sidelink; and

transmit the data to the second wireless communication device on the second sidelink via the wireless transceiver.

15. The first wireless communication device of claim 14 , wherein the processor and the memory are further configured to:

receive feedback information corresponding to the data via the wireless transceiver from the second wireless communication device on the first sidelink or the second sidelink.

16. The first wireless communication device of claim 14 , wherein the processor and the memory are further configured to:

generate the SCI comprising at least one of an identifier of the second frequency band on which the data is to be transmitted or resource information indicating resources on which the data is to be transmitted.

17. The first wireless communication device of claim 16 , wherein the processor and the memory are further configured to:

generate the resource information for the second sidelink based on at least one of first sidelink parameters associated with the first sidelink or second sidelink parameters associated with the second sidelink.

18. A method for wireless communication at a first wireless communication device, the method comprising:

establishing a first sidelink with a second wireless communication device on a first frequency band comprising a first carrier frequency

exchanging synchronization reference information with the second wireless communication device to synchronize timing on the first sidelink and a second sidelink, wherein the exchanged synchronization reference information indicates any timing offset between respective slot boundaries of the first and second sidelinks;

receiving sidelink control information (SCI) on the first sidelink, the SCI comprising an indicator that the SCI is scheduling data to be transmitted by the second wireless communication device on resources for the second sidelink within a second frequency band comprising a second carrier frequency.

19. The method of claim 18 , further comprising:

avoiding scheduling a transmission on the resources within the second frequency band based on the SCI.

20. The method of claim 18 , further comprising:

establishing, at least in part utilizing the first sidelink, the second sidelink with the second wireless communication device on the second frequency band;

receiving the data on the second sidelink from the second wireless communication device; and

transmitting feedback information corresponding to the data to the second wireless communication device on the first sidelink or the second sidelink.

21. The method of claim 20 , further comprising:

synchronizing timing on the first sidelink and the second sidelink.

22. The method of claim 20 , wherein establishing the second sidelink with the second wireless communication device further comprises:

aggregating the second carrier frequency and at least a third carrier frequency within the second frequency band to form the second sidelink.

23. The method of claim 20 , further comprising:

receiving reference signal configuration information from the second wireless communication device on the first sidelink, wherein the reference signal configuration information indicates a configuration of one or more reference signals to be transmitted on the second sidelink;

receiving the one or more reference signals on the second sidelink; and

transmitting a channel state information (CSI) report generated based on the one or more reference signals to the second wireless communication device on the first sidelink or the second sidelink.

24. The method of claim 18 , wherein the SCI further comprises at least one of an identifier of the second frequency band on which the data is to be transmitted or resource information indicating the resources on which the data is to be transmitted.

25. The method of claim 24 , wherein the resource information for the second sidelink is based on first sidelink parameters associated with the first sidelink, and further comprising:

translating the resource information based on the first sidelink parameters into translated resource information based on second sidelink parameters associated with the second sidelink.

26. The method of claim 25 , wherein the first sidelink parameters comprise a first subcarrier spacing and a first bandwidth part associated with the first sidelink and the second sidelink parameters comprise a second subcarrier spacing and a second bandwidth part associated with the second sidelink.

27. A first wireless communication device, comprising:

a processor;

a wireless transceiver communicatively coupled to the processor; and

a memory communicatively coupled to the processor, wherein the processor and the memory are configured to:

establish a first sidelink with a second wireless communication device on a first frequency band comprising a first carrier frequency via the wireless transceiver

exchange synchronization reference information with the second wireless communication device to synchronize timing on the first sidelink and a second sidelink, wherein the exchanged synchronization reference information indicates any timing offset between respective slot boundaries of the first and second sidelinks and;

receive sidelink control information (SCI) on the first sidelink, the SCI comprising an indicator that the SCI is scheduling data to be transmitted by the second wireless communication device on resources for the second sidelink within a second frequency band comprising a second carrier frequency.

28. The first wireless communication device of claim 27 , wherein the processor and the memory are further configured to:

establish, at least in part utilizing the first sidelink, the second sidelink with the second wireless communication device on the second frequency band via the wireless transceiver; and

receive the data on the second sidelink from the second wireless communication device via the wireless transceiver.

29. The first wireless communication device of claim 28 , wherein the processor and the memory are further configured to:

transmit feedback information corresponding to the data to the second wireless communication device on the first sidelink or the second sidelink.