Techniques and apparatuses for supplementary uplink random access configuration
Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive RACH configuration information on a downlink carrier of a first set of carriers, wherein the RACH configuration information pertains to the first set of carriers and to a second set of carriers; and selectively perform a RACH procedure with regard to the first set of carriers or the second set of carriers based at least in part on the RACH configuration information. Numerous other aspects are provided.
1. A method of wireless communication performed by a base station, comprising:
providing, to a user equipment, random access channel (RACH) configuration information,
wherein the RACH configuration information includes:
a threshold associated with one or more of a first set of carriers or a second set of carriers,
wherein the first set of carriers includes an uplink carrier that is a primary uplink carrier, and
wherein the second set of carriers includes an uplink carrier that is a supplementary uplink carrier; and
receiving, from the user equipment and based on providing the RACH configuration information, RACH procedure traffic using the second set of carriers.
2. The method of claim 1 , wherein the first set of carriers is associated with a higher frequency band than the second set of carriers.
3. The method of claim 1 , wherein the RACH configuration information is provided in radio resource control configuration information of the user equipment.
4. The method of claim 1 , wherein the RACH procedure traffic is received after the user equipment performs a RACH procedure using the second set of carriers.
5. The method of claim 4 , wherein the second set of carriers is selected for the RACH procedure based at least in part on the threshold.
6. The method of claim 1 , further comprising:
providing, to the user equipment, a flag or value indicating to perform a RACH procedure with regard to the second set of carriers.
7. The method of claim 1 , wherein a random access radio network temporary identifier (RA-RNTI) of the user equipment is determined based at least in part on the second set of carriers.
8. The method of claim 1 , wherein the RACH configuration information is provided on a downlink carrier of the first set of carriers.
9. The method of claim 1 , wherein the RACH procedure traffic comprises one or more of a first message or a third message of a RACH procedure.
10. The method of claim 1 , further comprising:
providing, to the user equipment, RACH procedure downlink traffic using the first set of carriers.
11. The method of claim 10 , wherein the RACH procedure downlink traffic comprises one or more of a second message or a fourth message of a RACH procedure.
12. The method of claim 1 , further comprising:
providing, to the user equipment, RACH procedure downlink traffic using a paired downlink carrier of the supplementary uplink carrier.
13. A base station for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
provide, to a user equipment, random access channel (RACH) configuration information,
wherein the RACH configuration information includes:
a threshold associated with one or more of a first set of carriers or a second set of carriers,
wherein the first set of carriers includes an uplink carrier that is a primary uplink carrier, and
wherein the second set of carriers includes an uplink carrier that is a supplementary uplink carrier; and
receive, from the user equipment and based on providing the RACH configuration information, RACH procedure traffic using the second set of carriers.
14. The base station of claim 13 , wherein the first set of carriers is associated with a higher frequency band than the second set of carriers.
15. The base station of claim 13 , wherein the RACH configuration information is provided in radio resource control configuration information of the user equipment.
16. The base station of claim 13 , wherein the RACH procedure traffic is received after the user equipment performs a RACH procedure using the second set of carriers.
17. The base station of claim 16 , wherein the second set of carriers is selected for the RACH procedure based at least in part on the threshold.
18. The base station of claim 13 , wherein the one or more processors are further configured to:
provide, to the user equipment, a flag or value indicating to perform a RACH procedure with regard to the second set of carriers.
19. The base station of claim 13 , wherein a random access radio network temporary identifier (RA-RNTI) of the user equipment is determined based at least in part on the second set of carriers.
20. The base station of claim 13 , wherein the RACH configuration information is provided on a downlink carrier of the first set of carriers.
21. The base station of claim 13 , wherein the RACH procedure traffic comprises one or more of a first message or a third message of a RACH procedure.
22. The base station of claim 13 , wherein the one or more processors are further configured to:
provide, to the user equipment, RACH procedure downlink traffic using the first set of carriers.
23. The base station of claim 22 , wherein the RACH procedure downlink traffic comprises one or more of a second message or a fourth message of a RACH procedure.
24. The base station of claim 13 , wherein the one or more processors are further configured to:
provide, to the user equipment, RACH procedure downlink traffic using a paired downlink carrier of the supplementary uplink carrier.
25. An apparatus for wireless communication, comprising:
means for providing, to a user equipment, random access channel (RACH) configuration information,
wherein the RACH configuration information includes:
a threshold associated with one or more of a first set of carriers or a second set of carriers,
wherein the first set of carriers includes an uplink carrier that is a primary uplink carrier, and
wherein the second set of carriers includes an uplink carrier that is a supplementary uplink carrier; and
means for receiving, from the user equipment and based on providing the RACH configuration information, RACH procedure traffic using the second set of carriers.
26. The apparatus of claim 25 , wherein the first set of carriers is associated with a higher frequency band than the second set of carriers.
27. The apparatus of claim 25 , wherein the RACH configuration information is provided in radio resource control configuration information of the user equipment.
28. The apparatus of claim 25 , wherein the RACH procedure traffic is received after the user equipment performs a RACH procedure using the second set of carriers.
29. The apparatus of claim 28 , wherein the second set of carriers is selected for the RACH procedure based at least in part on the threshold.
30. The apparatus of claim 25 , wherein the RACH configuration information is provided on a downlink carrier of the first set of carriers.