Interaction of the wake-up signal (WUS) with downlink positioning reference signal (PRS) reception in a wireless network
A user equipment (UE) operating in a discontinuous reception (DRX) mode may receive a wake-up signal indicating that the UE may skip the next ON duration of the DRX cycle, i.e., the UE is instructed to not wake up during a next ON time during the DRX cycle to monitor communication signals, such as data signals or control signals. The UE may be configured to receive downlink (DL) positioning reference signals (PRSs), e.g., during the next ON duration of the DRX cycle. The UE respond to the PRS configuration and the wake-up signal by remaining in DRX sleep mode and not receiving the PRS or transitioning to DRX ON mode to receive the PRS during which the UE may monitor or not monitor communication signals. The location server may receive indications of the wake-up signal configuration and status from a base station or the UE.
1. A method of wireless communication performed by a user equipment (UE) operating in a discontinuous reception (DRX) mode, comprising:
receiving a positioning reference signal (PRS) configuration for receiving PRS;
receiving a wake-up signal from a serving base station indicating that the UE is not to wake up during a next ON time during a DRX cycle to monitor for communication signals, the communication signals comprising data signals or control signals or both;
in response to the PRS configuration and the wake-up signal, performing one of:
A) remaining in a DRX sleep mode and not receiving the PRS; or
B) transitioning to a DRX ON mode to receive the PRS but not monitoring for the communication signals; or
C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals.
2. The method of claim 1 , wherein the PRS is scheduled to be received during the next ON time during the DRX cycle.
3. The method of claim 1 , wherein the performance of A) remaining in the DRX sleep mode and not receiving the PRS, B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals, or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals is dependent on time domain behavior of the PRS, wherein the time-domain behavior comprises the PRS being periodic, semi-persistent, or aperiodic.
4. The method of claim 3 , wherein the UE performs A) remaining in the DRX sleep mode and not receiving the PRS when the PRS is configured to be periodic or semi-periodic, and the UE performs B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals when the PRS is configured to be the aperiodic.
5. The method of claim 1 , wherein the performance of A) remaining in the DRX sleep mode and not receiving the PRS, B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals, or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals is dependent on a transmission point of the PRS.
6. The method of claim 5 , wherein the UE performs A) remaining in the DRX sleep mode and not receiving the PRS when the PRS is configured to be transmitted by the serving base station, and the UE performs B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals when the PRS is configured to be transmitted by a neighboring transmission reception point (TRP).
7. The method of claim 5 , wherein the UE performs B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals when the PRS is configured to be transmitted by a reference base station, and the UE performs A) remaining in the DRX sleep mode and not receiving the PRS when the PRS is configured to be transmitted by a neighboring TRP.
8. The method of claim 1 , wherein the performance of A) remaining in the DRX sleep mode and not receiving the PRS, B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals, or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals is dependent on one or more of the UE performing inter-frequency or intra-frequency measurement of the PRS or a measurement gap configuration.
9. The method of claim 8 , wherein the UE performs B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals when the PRS is configured to be intra-frequency with an active bandwidth part and requires a measurement gap or the UE performs C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals when the PRS is configured to be inter-frequency with the active bandwidth part and does not require the measurement gap.
10. The method of claim 1 , wherein the PRS is part of a subset of PRS for which the UE is configured to perform A) remaining in the DRX sleep mode and not receiving the PRS, B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals, or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals.
11. The method of claim 10 , wherein the subset of PRS comprises a subset of PRS resources, PRS sets, PRS frequency layers, or PRS transmitted by transmission reception points (TRPs), or combination thereof.
12. The method of claim 1 , wherein the wake-up signal is an indicator in a downlink control information (DCI) message, wherein the UE performs A) remaining in the DRX sleep mode and not receiving the PRS, B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals, or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals based on information associated with the wake-up signal in the DCI message.
13. The method of claim 12 , wherein the information associated with the wake-up signal in the DCI message is a joint bitfield with a channel state information (CSI) request or CSI-reference signal (RS) triggering or a combination thereof, or is a dedicated bitfield for indicating whether the UE performs A) remaining in the DRX sleep mode and not receiving the PRS, B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals, or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals.
14. The method of claim 1 , further comprising:
receiving one or more of a message from the serving base station, a message from a location server, or a combination thereof, that configures the UE to perform A) remaining in the DRX sleep mode and not receiving the PRS, B) transitioning to the DRX ON mode to receive the PRS but not monitoring for the communication signals, or C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals.
15. The method of claim 14 , wherein the message from the location server configures the UE to transition to the DRX ON mode to receive the PRS in response to the wake-up signal indicating that the UE is not to wake up, and the message from the serving base station configures the UE to not monitor for the communication signals or to monitor for the communication signals.
16. The method of claim 1 , wherein the wake-up signal indicating that the UE is not to wake up during the next ON time during the DRX cycle to monitor for data signals or control signals is provided to a location server from the serving base station.
17. The method of claim 16 , further comprising receiving a DRX configuration from the serving base station, wherein the DRX configuration is provided to the location server from the serving base station.
18. The method of claim 16 , wherein the serving base station provides to the location server an indication of when the UE is configured to monitor for the wake-up signal and when the wake-up signal is ON or OFF.
19. The method of claim 1 , further comprising transmitting a report to a location server of receipt of the wake-up signal indicating that the UE is not to wake up during the next ON time during the DRX cycle.
20. The method of claim 19 , wherein the report of the receipt of the wake-up signal is in a positioning measurement report.
21. A user equipment (UE) configured for wireless communication and operating in a discontinuous reception (DRX) mode, comprising:
a transceiver for wirelessly receiving and sending messages;
at least one memory; and
at least one processor coupled to the transceiver and the at least one memory, the at least one processor configured to:
receive, via the transceiver, a positioning reference signal (PRS) configuration for receiving PRS;
receive, via the transceiver, a wake-up signal from a serving base station indicating that the UE is not to wake up during a next ON time during a DRX cycle to monitor for communication signals, the communication signals comprising data signals or control signals or both;
in response to the PRS configuration and the wake-up signal, perform one of:
A) remain in a DRX sleep mode and not receive the PRS; or
B) transition to a DRX ON mode to receive the PRS but not monitor for the communication signals; or
C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals.
22. The UE of claim 21 , wherein the PRS is scheduled to be received during the next ON time during the DRX cycle.
23. The UE of claim 21 , wherein the performance of A) remain in the DRX sleep mode and not receive the PRS, B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals, or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals is dependent on time domain behavior of the PRS, wherein the time-domain behavior comprises the PRS being periodic, semi-persistent, or aperiodic.
24. The UE of claim 23 , wherein the VE performs A) remain in the DRX sleep mode and not receive the PRS when the PRS is configured to be periodic or semi-periodic, and the UE performs B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals when the PRS is configured to be the aperiodic.
25. The UE of claim 21 , wherein the performance of A) remain in the DRX sleep mode and not receive the PRS, B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals, or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals is dependent on a transmission point of the PRS.
26. The UE of claim 25 , wherein the UE performs A) remain in the DRX sleep mode and not receive the PRS when the PRS is configured to be transmitted by the serving base station, and the UE performs B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals when the PRS is configured to be transmitted by a neighboring transmission reception point (TRP).
27. The UE of claim 25 , wherein the UE performs B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals when the PRS is configured to be transmitted by a reference base station, and the UE performs A) remain in the DRX sleep mode and not receive the PRS when the PRS is configured to be transmitted by a neighboring TRP.
28. The UE of claim 21 , wherein the performance of A) remain in the DRX sleep mode and not receive the PRS, B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals, or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals is dependent on one or more of the UE performing inter-frequency or intra-frequency measurement of the PRS or a measurement gap configuration.
29. The UE of claim 28 , wherein the UE performs B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals when the PRS is configured to be intra-frequency with an active bandwidth part and requires a measurement gap or the UE performs C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals when the PRS is configured to be inter-frequency with the active bandwidth part and does not require the measurement gap.
30. The UE of claim 21 , wherein the PRS is part of a subset of PRS for which the UE is configured to perform A) remain in the DRX sleep mode and not receive the PRS, B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals, or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals.
31. The UE of claim 30 , wherein the subset of PRS comprises a subset of PRS resources, PRS sets, PRS frequency layers, or PRS transmitted by transmission reception points (TRPs), or combination thereof.
32. The UE of claim 21 , wherein the wake-up signal is an indicator in a downlink control information (DCI) message, wherein the UE performs A) remain in the DRX sleep mode and not receive the PRS, B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals, or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals based on information associated with the wake-up signal in the DCI message.
33. The UE of claim 32 , wherein the information associated with the wake-up signal in the DCI message is a joint bitfield with a channel state information (CSI) request or CSI-reference signal (RS) triggering or a combination thereof, or is a dedicated bitfield for indicating whether the UE performs A) remain in the DRX sleep mode and not receive the PRS, B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals, or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals.
34. The UE of claim 21 , wherein the at least one processor is further configured to:
receive, via the transceiver, one or more of a message from the serving base station, a message from a location server, or a combination thereof, that configures the UE to perform A) remain in the DRX sleep mode and not receive the PRS, B) transition to the DRX ON mode to receive the PRS but not monitor for the communication signals, or C) transition to the DRX ON mode to receive the PRS and monitor for the communication signals.
35. The UE of claim 34 , wherein the message from the location server configures the UE to transition to the DRX ON mode to receive the PRS in response to the wake-up signal indicating that the UE is not to wake up, and the message from the serving base station configures the UE to not monitor for the communication signals or to monitor for the communication signals.
36. The UE of claim 21 , wherein the wake-up signal indicating that the UE is not to wake up during the next ON time during the DRX cycle to monitor for data signals or control signals is provided to a location server from the serving base station.
37. The UE of claim 36 , wherein the at least one processor is further configured to receive a DRX configuration from the serving base station, wherein the DRX configuration is provided to the location server from the serving base station.
38. The UE of claim 36 , wherein the serving base station provides to the location server an indication of when the UE is configured to monitor for the wake-up signal and when the wake-up signal is ON or OFF.
39. The UE of claim 21 , wherein the at least one processor is further configured to transmit a report to a location server of receipt of the wake-up signal indicating that the UE is not to wake up during the next ON time during the DRX cycle.
40. The UE of claim 39 , wherein the report of the receipt of the wake-up signal is a positioning measurement report.
41. A method of wireless communication for a user equipment (UE) operating in a discontinuous reception (DRX) mode performed by a base station in a wireless network serving the UE, comprising:
transmitting to the UE a wake-up signal indicating that the UE is not to wake up during a next ON time during a DRX cycle to monitor for communication signals, the communication signals comprising data signals or control signals or both;
wherein the UE is configured to receive positioning reference signals (PRSs), and in response to the configuration to receive the (PRSs) and the wake-up signal, the UE performs one of:
A) remaining in a DRX sleep mode and not receiving the PRS; or
B) transitioning to a DRX ON mode to receive the PRS but not monitoring for the communication signals; or
C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals;
transmitting to a location server an indication of the wake-up signal indicating that the UE is not to wake up during the next ON time during the DRX cycle to monitor for the communication signals.
42. The method of claim 41 , further comprising:
transmitting a DRX configuration to the UE;
transmitting the DRX configuration to the location server.
43. The method of claim 41 , further comprising:
transmitting to the location server an indication of when the UE is configured to monitor the wake-up signal and when the wake-up signal is ON or OFF.
44. A base station in a wireless network serving a user equipment (UE), the UE configured for wireless communication and operating in a discontinuous reception (DRX) mode, comprising:
a transceiver for wirelessly receiving and sending messages with UEs;
a communication interface for receiving and sending messages to entities within the wireless network;
at least one memory; and at least one processor coupled to the transceiver, the communication interface, and the at least one memory, the at least one processor configured to:
transmit to the UE, via the transceiver, a wake-up signal indicating that the UE is not to wake up during a next ON time during a DRX cycle to monitor for communication signals, the communication signals comprising data signals or control signals or both;
wherein the UE is configured to receive positioning reference signals (PRSs), and in response to the configuration to receive the (PRSs) and the wake-up signal, the UE performs one of:
A) remaining in a DRX sleep mode and not receiving the PRS; or
B) transitioning to a DRX ON mode to receive the PRS but not monitoring for the communication signals; or
C) transitioning to the DRX ON mode to receive the PRS and monitoring for the communication signals; transmit to a location server, via the communications interface, an indication of the wake-up signal indicating that the UE is not to wake up during the next ON time during the DRX cycle to monitor for the communication signals.
45. The base station of claim 44 , wherein the at least one processor is further configured to:
transmit, via the transceiver, a DRX configuration to the UE;
transmit, via the communications interface, the DRX configuration to the location server.
46. The base station of claim 44 , wherein the at least one processor is further configured to:
transmit to the location server, via the communications interface, an indication of when the UE is configured to monitor the wake-up signal and when the wake-up signal is ON or OFF.