Random access channel (RACH) transmission with cross-band downlink/uplink (DL/UL) pairing

1. A method of wireless communication, comprising:

communicating, by a first wireless communication device with a second wireless communication device, a random access configuration including information associated with a channel characteristic difference between a first frequency spectrum and a second frequency spectrum, the random access configuration communicated in the first frequency spectrum; and

communicating, by the first wireless communication device with the second wireless communication device, a random access signal in the second frequency spectrum based on the random access configuration.

2. The method of claim 1 , wherein the channel characteristic difference includes at least one of a penetration loss difference between the first frequency spectrum and the second frequency spectrum, a path loss difference between the first frequency spectrum and the second frequency spectrum, or an antenna array gain difference between communications in the first frequency spectrum and the second frequency spectrum.

3. The method of claim 1 , wherein the random access configuration includes a target reception power level for the random access signal.

4. The method of claim 3 , wherein the communicating the random access configuration includes transmitting, by the first wireless communication device to the second wireless communication device, the random access configuration including the target reception power level for the random access signal at the first wireless communication device, and wherein the communicating the random access signal includes receiving, by the first wireless communication device from the second wireless communication device, the random access signal.

5. The method of claim 4 , further comprising:

determining, by the first wireless communication device, the target reception power level for the random access signal at the first wireless communication device based on the channel characteristic difference.

6. The method of claim 3 , wherein the communicating the random access configuration includes receiving, by the first wireless communication device from the second wireless communication device, the random access configuration including the target reception power level for the random access signal at the second wireless communication device, and wherein the communicating the random access signal includes transmitting, by the first wireless communication device to the second wireless communication device, the random access signal at a transmission power level based on the random access configuration.

7. The method of claim 6 , further comprising:

determining, by the first wireless communication device, the transmission power level based on at least the received target reception power level.

8. The method of claim 1 , further comprising:

communicating, by the first wireless communication device with the second wireless communication device, a random access response in the first frequency spectrum in response to the random access signal;

communicating, by the first wireless communication device with the second wireless communication device, a connection request in the second frequency spectrum in response to the random access response; and

communicating, by the first wireless communication device with the second wireless communication device, a connection response in the first frequency spectrum in response to the connection request.

9. The method of claim 1 , further comprising:

communicating, by the first wireless communication device with the second wireless communication device, a first communication signal on a first subcarrier spacing in the first frequency spectrum; and

communicating, by the first wireless communication device with the second wireless communication device, a second communication signal based on a second subcarrier spacing in the second frequency spectrum,

wherein the first subcarrier spacing and the second subcarrier spacing are different.

10. The method of claim 1 , wherein the first frequency spectrum is at a millimeter wave band, and wherein the second frequency spectrum is at a non-millimeter wave band.

11. An apparatus comprising:

a transceiver configured to:

communicate, with a wireless communication device, a random access configuration including information associated with a channel characteristic difference between a first frequency spectrum and a second frequency spectrum, the random access configuration communicated in the first frequency spectrum; and

communicate, with the wireless communication device, a random access signal in the second frequency spectrum based on the random access configuration.

12. The apparatus of claim 11 , wherein the channel characteristic difference includes at least one of a penetration loss difference between the first frequency spectrum and the second frequency spectrum, a path loss difference between the first frequency spectrum and the second frequency spectrum, or an antenna array gain difference between communications in the first frequency spectrum and the second frequency spectrum.

13. The apparatus of claim 11 , wherein the random access configuration includes a target reception power level for the random access signal.

14. The apparatus of claim 13 , wherein the transceiver is further configured to:

communicate the random access configuration by transmitting, to the wireless communication device, the random access configuration including the target reception power level for the random access signal at the apparatus; and

communicate the random access signal by receiving, from the wireless communication device, the random access signal.

15. The apparatus of claim 14 , further comprising:

a processor configured to determine the target reception power level for the random access signal at the apparatus based on the channel characteristic difference.

16. The apparatus of claim 13 , wherein the transceiver is further configured to:

communicate the random access configuration by receiving, from the wireless communication device, the random access configuration including the target reception power level for the random access signal at the wireless communication device; and

communicate the random access signal by transmitting, to the wireless communication device, the random access signal at a transmission power level based on the random access configuration.

17. The apparatus of claim 16 , further comprising:

a processor configured to determine the transmission power level based on at least the received target reception power level.

18. The apparatus of claim 11 , wherein the transceiver is further configured to:

communicate, with the wireless communication device, a random access response in the first frequency spectrum in response to the random access signal;

communicate, with the wireless communication device, a connection request in the second frequency spectrum in response to the random access response; and

communicate, with the wireless communication device, a connection response in the first frequency spectrum in response to the connection request.

19. The apparatus of claim 11 , wherein the transceiver is further configured to:

communicate, with the wireless communication device, a first communication signal on a first subcarrier spacing in the first frequency spectrum; and

communicate, with the wireless communication device, a second communication signal based on a second subcarrier spacing in the second frequency spectrum,

wherein the first subcarrier spacing and the second subcarrier spacing are different.

20. The apparatus of claim 11 , wherein the first frequency spectrum is at a millimeter wave band, and wherein the second frequency spectrum is at a non-millimeter wave band.

21. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

code for causing a first wireless communication device to communicate, with a second wireless communication device, a random access configuration including information associated with a channel characteristic difference between a first frequency spectrum and a second frequency spectrum, the random access configuration communicated in the first frequency spectrum; and

code for causing the first wireless communication device to communicate, with the second wireless communication device, a random access signal in the second frequency spectrum based on the random access configuration.

22. The non-transitory computer-readable medium of claim 21 , wherein the channel characteristic difference includes at least one of a penetration loss difference between the first frequency spectrum and the second frequency spectrum, a path loss difference between the first frequency spectrum and the second frequency spectrum, or an antenna array gain difference between communications in the first frequency spectrum and the second frequency spectrum.

23. The non-transitory computer-readable medium of claim 21 , wherein the random access configuration includes a target reception power level for the random access signal.

24. The non-transitory computer-readable medium of claim 23 , wherein the code for causing the first wireless communication device to communicate the random access configuration is further configured to transmit, to the second wireless communication device, the random access configuration including the target reception power level for the random access signal at the first wireless communication device, and wherein the code for causing the first wireless communication device to communicate the random access signal is further configured to receive, from the second wireless communication device, the random access signal.

25. The non-transitory computer-readable medium of claim 24 , further comprising:

code for causing the first wireless communication device to determine a target reception power level for the random access signal at the first wireless communication device based on the channel characteristic difference.

26. The non-transitory computer-readable medium of claim 23 , wherein the code for causing the first wireless communication device to communicate the random access configuration is further configured to receive, from the second wireless communication device, the random access configuration including the target reception power level for the random access signal at the second wireless communication device, and wherein the code for causing the first wireless communication device to communicate the random access signal is further configured to transmit, to the second wireless communication device, the random access signal at a transmission power level based on the random access configuration.

27. The non-transitory computer-readable medium of claim 26 , further comprising:

code for causing the first wireless communication device to determine the transmission power level based on at least the received target reception power level.

28. The non-transitory computer-readable medium of claim 21 , further comprising:

code for causing the first wireless communication device to communicate, with the second wireless communication device, a random access response in the first frequency spectrum in response to the random access signal;

code for causing the first wireless communication device to communicate, with the second wireless communication device, a connection request in the second frequency spectrum in response to the random access response; and

code for causing the first wireless communication device to communicate, with the second wireless communication device, a connection response in the first frequency spectrum in response to the connection request.

29. The non-transitory computer-readable medium of claim 21 , further comprising:

code for causing the first wireless communication device to communicate, with the second wireless communication device, a first communication signal on a first subcarrier spacing in the first frequency spectrum; and

code for causing the first wireless communication device to communicate, with the second wireless communication device, a second communication signal based on a second subcarrier spacing in the second frequency spectrum,

wherein the first subcarrier spacing and the second subcarrier spacing are different.

30. The non-transitory computer-readable medium of claim 21 , wherein the first frequency spectrum is at a millimeter wave band, and wherein the second frequency spectrum is at a non-millimeter wave band.