Rach numerology with BWP operation
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives, in an active down-link bandwidth part, a random access response from a base station indicating an up-link resource in an active up-link bandwidth part for transmitting a random access message. The UE generates the random access message based on a numerology of the active up-link bandwidth part. The UE transmits the random access message at the up-link resource in the active up-link bandwidth part.
1. A method of wireless communication of a user equipment (UE), comprising:
receiving, in an active down-link bandwidth part, a random access response from a base station indicating an up-link resource in an active up-link bandwidth part for transmitting a random access message, wherein the active up-link bandwidth part is different from an initial up-link bandwidth part configured for the UE;
generating the random access message based on a numerology of the active up-link bandwidth part; and
transmitting the random access message at the up-link resource in the active up-link bandwidth part.
2. The method of claim 1 , wherein the active up-link bandwidth part is the same as an initial up-link bandwidth part configured for the UE.
3. The method of claim 1 , wherein the active up-link bandwidth part is the same as the active down-link bandwidth part, and an initial up-link bandwidth part is the same as an initial down-link bandwidth part that the UE has camped on, and the active up-link bandwidth is different from the initial down-link bandwidth part.
4. The method of claim 1 , further comprising:
transmitting a preamble sequence to the base station in the active up-link bandwidth part when the UE is in a connected state prior to receiving the random access response.
5. The method of claim 1 , further comprising:
determining the numerology of the active up-link bandwidth part based on one or more configurations received from the base station.
6. The method of claim 5 , further comprising:
receiving a control message from the base station, the control message including the one or more configurations defining the numerology of the active up-link bandwidth part.
7. The method of claim 5 , wherein the numerology defines a sub-carrier spacing of the active up-link bandwidth part.
8. The method of claim 5 , wherein the numerology defines a sub-carrier spacing and a cyclic prefix of the active up-link bandwidth part.
9. The method of claim 5 , wherein the numerology defines a cyclic prefix of the active up-link bandwidth part.
10. An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, in an active down-link bandwidth part, a random access response from a base station indicating an up-link resource in an active up-link bandwidth part for transmitting a random access message, wherein the active up-link bandwidth part is different from an initial up-link bandwidth part configured for the UE;
generate the random access message based on a numerology of the active up-link bandwidth part; and
transmit the random access message at the up-link resource in the active up-link bandwidth part.
11. The apparatus of claim 10 , wherein the active up-link bandwidth part is the same as an initial up-link bandwidth part configured for the UE.
12. The apparatus of claim 10 , wherein the active up-link bandwidth part is the same as the active down-link bandwidth part, and an initial up-link bandwidth part is the same as an initial down-link bandwidth part that the UE has camped on, and the active up-link bandwidth is different from the initial down-link bandwidth part.
13. The apparatus of claim 10 , wherein the at least one processor is further configured to:
transmit a preamble sequence to the base station in the active up-link bandwidth part when the UE is in a connected state prior to receiving the random access response.
14. The apparatus of claim 10 , wherein the at least one processor is further configured to:
determine the numerology of the active up-link bandwidth part based on one or more configurations received from the base station.
15. The apparatus of claim 14 , wherein the at least one processor is further configured to:
receive a control message from the base station, the control message including the one or more configurations defining the numerology of the active up-link bandwidth part.
16. The apparatus of claim 14 , wherein the numerology defines a sub-carrier spacing of the active up-link bandwidth part.
17. The apparatus of claim 14 , wherein the numerology defines a sub-carrier spacing and a cyclic prefix of the active up-link bandwidth part.
18. The apparatus of claim 14 , wherein the numerology defines a cyclic prefix of the active up-link bandwidth part.
19. A non-transitory computer-readable medium storing computer executable code for wireless communication of a user equipment (UE), comprising code to:
receive, in an active down-link bandwidth part, a random access response from a base station indicating an up-link resource in an active up-link bandwidth part for transmitting a random access message, wherein the active up-link bandwidth part is different from an initial up-link bandwidth part configured for the UE;
generate the random access message based on a numerology of the active up-link bandwidth part; and
transmit the random access message at the up-link resource in the active up-link bandwidth part.