System information acquisition over bandwidth parts
Certain aspects of the present disclosure relate to communication systems, and more particularly, to system information acquisition over bandwidth parts (BWPs) in communications system operating according to new radio (NR) technologies. In an exemplary method, a user equipment (UE) receives system information (SI) via a transmission in a downlink (DL) bandwidth part (BWP) of a system bandwidth and transmits, to a serving base station (BS) and in response to receiving the SI, an indication that the UE has completed SI acquisition.
1. A method of wireless communications performed by a user equipment (UE), comprising:
receiving a first command in a first downlink control information (DCI) to switch to a first downlink (DL) bandwidth part (BWP) of a system bandwidth, wherein the first DCI comprises a request to the UE to transmit, subsequent to the UE receiving system information (SI), an indication that the UE has completed SI acquisition;
receiving the SI via a transmission in the first DL BWP;
transmitting, to a serving base station (BS) and in response to receiving the SI, the indication that the UE has completed SI acquisition;
receiving a second command in a second DCI to switch to a second DL BWP subsequent to receiving the SI; and
switching a receiver of the UE to receive via the second DL BWP in response to receiving the second command.
2. The method of claim 1 , wherein transmitting the indication comprises transmitting the indication via a medium access control (MAC) control element (CE).
3. The method of claim 1 , wherein transmitting the indication comprises transmitting the indication via radio resource control (RRC) signaling.
4. The method of claim 1 , wherein transmitting the indication comprises transmitting the indication via layer one (L1) signaling.
5. The method of claim 4 , wherein the L1 signaling comprises a scheduling request (SR) or a physical uplink shared channel (PUSCH) in preconfigured resources.
6. The method of claim 1 , further comprising:
determining to transmit the indication that the UE has completed the SI acquisition, based on the request.
7. A method of wireless communications performed by a base station (BS), comprising:
transmitting a first command in a first downlink control information (DCI) for a user equipment (UE) to switch to a first downlink (DL) bandwidth part (BWP) of a system bandwidth, wherein the first DCI comprises a request to the UE to transmit, subsequent to the UE receiving system information (SI), an indication that the UE has completed SI acquisition;
transmitting the SI to the UE via the first DL BWP; and
receiving from the UE the indication that the UE has completed SI acquisition subsequent to transmitting the SI; and
transmitting a second command in a second DCI for the UE to switch to a second DL BWP subsequent to receiving the SI.
8. The method of claim 7 , further comprising:
identifying a current DL BWP of the UE prior to transmitting the SI; and
transmitting the first command, in the first DCI via the current DL BWP prior to transmitting the SI.
9. The method of claim 7 , further comprising:
determining the first DL BWP is a currently configured DL BWP for the UE, prior to transmitting the SI.
10. The method of claim 7 , further comprising:
obtaining, subsequent to transmitting the SI, data other than the SI for transmission to the UE prior to receiving the indication;
determining, based on not receiving the indication, to transmit the data via the first DL BWP; and
transmitting the data to the UE via the first DL BWP and prior to receiving the indication from the UE.
11. The method of claim 7 , further comprising:
obtaining data other than the SI for transmission to the UE; and
transmitting the data to the UE via a second DL BWP subsequent to receiving the indication from the UE.
12. The method of claim 7 , wherein receiving the indication comprises receiving the indication via a medium access control (MAC) control element (CE).
13. The method of claim 7 , wherein receiving the indication comprises receiving the indication via radio resource control (RRC) signaling.
14. A method of wireless communications performed by a user equipment (UE), comprising:
receiving a page from a base station (BS) via an active downlink (DL) bandwidth part (BWP) of a system bandwidth;
switching a receiver of the UE to receive via another DL BWP different from the active DL BWP of the system bandwidth in response to receiving the page;
receiving updated system information (SI) from the BS via the other DL BWP subsequent to switching the receiver to receive via the other DL BWP; and
switching the receiver of the UE to receive via the active DL BWP in response to receiving the updated SI.
15. The method of claim 14 , further comprising:
receiving public warning system (PWS) SI via one of the active DL BWP or the other DL BWP.
16. The method of claim 14 , further comprising:
receiving data other than the updated SI via the active DL BWP subsequent to switching the receiver of the UE to receive via the active DL BWP.
17. An apparatus for wireless communications, comprising:
a processor configured to:
receive a first command in a first downlink control information (DCI) to switch to a first downlink (DL) bandwidth part (BWP) of a system bandwidth, wherein the first DCI comprises a request to the apparatus to transmit, subsequent to the apparatus receiving system information (SI), an indication that the apparatus has completed SI acquisition
receive the SI via a transmission in the first DL BWP;
transmit, to a serving base station (BS) and in response to receiving the SI, the indication that the apparatus has completed SI acquisition;
receive a second command in a second DCI to switch to a second DL BWP subsequent to receiving the SI; and
switch a receiver of the apparatus to receive via the second DL BWP in response to receiving the second command; and
a memory coupled with the processor.
18. The apparatus of claim 17 , wherein the processor is configured to transmit the indication via a medium access control (MAC) control element (CE).
19. The apparatus of claim 17 , wherein the processor is configured to transmit the indication via radio resource control (RRC) signaling.
20. The apparatus of claim 17 , wherein the processor is configured to transmit the indication via layer one (L1) signaling.
21. The apparatus of claim 20 , wherein the L1 signaling comprises a scheduling request (SR) or a physical uplink shared channel (PUSCH) in preconfigured resources.
22. The apparatus of claim 17 , wherein the processor is configured to:
determine to transmit the indication that the apparatus has completed the SI acquisition, based on the request.