EP-4740561-A1 - FAILURE DETECTION FOR COMMUNICATION POWER STATE SWITCHING

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive, from a network entity, control information indicating a first schedule for the UE to transition between a set of power states. The UE may determine to perform a radio link failure (RLF) or beam failure (BF) detection operation for a radio link or beam used to communicate with the network entity. The UE may apply a second schedule to transition between the set of power states based on the determination. The second schedule may include a postponement of a transition to a power state of the set of power states. The UE may perform an RLF or BF detection operation based on applying the second schedule. Additionally, or alternatively, the UE may modify operation of a hybrid automatic repeat request (HARQ) round trip time timer based on a power state in which the UE operates.

Inventors

• ZHOU, Zhichao
• ELSHAFIE, AHMED
• MAAMARI, Diana
• HANDE, PRASHANTH HARIDAS

Assignees

• QUALCOMM Incorporated

Dates

Publication Date

20260513

Application Date

20230706

Claims (20)

1. A user equipment (UE) for wireless communication, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to: receive control information that indicates a first schedule for the UE to transition between a plurality of power states, wherein the plurality of power states includes an uplink-only state during which a primary radio of the UE is used for uplink transmissions, and a second state during which the primary radio of the UE is used at least for downlink transmissions; determine that the UE is to perform a radio link failure or beam failure detection operation; and apply a second schedule for the UE to transition between the plurality of power states based at least in part on the determination that the UE is to perform the radio link failure or beam failure detection operation.
2. The UE of claim 1, wherein, to determine that the UE is to perform the radio link failure or beam failure detection operation, the one or more processors are individually or collectively operable to execute the code to cause the UE to: receive a downlink control information message that activates the radio link failure or beam failure detection operation, wherein applying the second schedule is based at least in part on receipt of the downlink control information message.
3. The UE of claim 2, wherein the second schedule includes a postponement of a transition from the second state to the uplink-only state until after an expiration of a failure detection timer associated with the radio link failure or beam failure detection operation.
4. The UE of claim 2, wherein, to receive the downlink control information message, the one or more processors are individually or collectively operable to execute the code to cause the UE to: receive an indication that the UE is to apply the second schedule.
5. The UE of claim 1, wherein, to determine that the UE is to perform the radio link failure or beam failure detection operation, the one or more processors are individually or collectively operable to execute the code to cause the UE to: receive a wake-up signal associated with an indication that the UE is to perform the radio link failure or beam failure detection operation, wherein applying the second schedule is based at least in part on receipt of the wake-up signal, and wherein the second schedule includes a postponement of a transition from the second state to the uplink-only state; and perform the radio link failure or beam failure detection operation after applying the second schedule.
6. The UE of claim 5, wherein: the wake-up signal includes an indication of the second schedule, and the second schedule includes a transition to the uplink-only state after completion of the radio link failure or beam failure detection operation.
7. The UE of claim 1, wherein the control information further indicates a plurality of schedules for the UE to transition between the plurality of power states, and the one or more processors are individually or collectively further operable to execute the code to cause the UE to: receive a priority indication associated with the radio link failure or beam failure detection operation; and select the second schedule from the plurality of schedules based at least in part on the priority indication of the radio link failure or beam failure detection operation.
8. The UE of claim 7, wherein each of the plurality of schedules includes a respective timer duration for postponement of a transition from the second state to the uplink-only state, and wherein, to select the second schedule from the plurality of schedules, the one or more processors are individually or collectively operable to execute the code to cause the UE to: select the second schedule based at least in part on an association between the respective timer duration of the second schedule and the priority indication.
9. The UE of claim 8, wherein the association includes that a higher priority is associated with a longer timer duration prior to a transition from the second state to the uplink-only state and a lower priority is associated with a shorter timer duration prior to the transition from the second state to the uplink-only state.
10. The UE of claim 1, wherein, to determine that the UE is to perform the radio link failure or beam failure detection operation, the one or more processors are individually or collectively operable to execute the code to cause the UE to: receive a wake-up signal associated with an indication that the UE is to perform the radio link failure or beam failure detection operation, wherein applying the second schedule is based at least in part on receipt of the wake-up signal, and wherein the second schedule includes a transition from the uplink-only state to the second state.
11. The UE of claim 10, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to: receive an indication of a duration of time from receipt of the wake-up signal and the transition from the uplink-only state to the second state.
12. The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to: perform the radio link failure or beam failure detection operation; and detect at least one failure instance during the radio link failure or beam failure detection operation, wherein applying the second schedule is based at least in part on detecting the at least one failure instance, and wherein the second schedule comprises a postponement of a transition from the second state to the uplink-only state.
13. The UE of claim 12, wherein the postponement of the transition from the second state to the uplink-only state is until after an expiration of a failure detection timer associated with the radio link failure or beam failure detection operation.
14. The UE of claim 12, wherein the control information further indicates a plurality of schedules for the UE to transition between the plurality of power states, and the one or more processors are individually or collectively further operable to execute the code to cause the UE to: select the second schedule from the plurality of schedules based at least in part on detecting the at least one failure instance.
15. The UE of claim 12, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to: transmit an uplink message including an indication that the second schedule is applied; and receive, based at least in part on transmitting the uplink message, one or more downlink signals for performing the radio link failure or beam failure detection operation, wherein the uplink message is one of an uplink control information message, a medium access control (MAC) control element (CE) , or a physical uplink shared channel message to which the indication is piggybacked.
16. A network entity for wireless communication, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to: transmit, to a user equipment (UE) , control information that indicates a first schedule for the UE to transition between a plurality of power states, wherein the plurality of power states includes an uplink-only state during which a primary radio of the UE is used for uplink transmissions, and a second state during which the primary radio of the UE is used at least for downlink transmissions; determine that the UE is to perform a radio link failure or beam failure detection operation; and transmit, to the UE, a message that triggers the UE to transition from the first schedule to a second schedule for the UE to transition between the plurality of power states based at least in part on the determination that the UE is to perform the radio link failure or beam failure detection operation.
17. The network entity of claim 16, wherein, to transmit the message that triggers the UE to transition from the first schedule to the second schedule, the one or more processors are individually or collectively operable to execute the code to cause the network entity to: transmit a downlink control information message that activates the radio link failure or beam failure detection operation.
18. The network entity of claim 17, wherein the second schedule includes a postponement of a transition from the second state to the uplink-only state until after an expiration of a failure detection timer associated with the radio link failure or beam failure detection operation.
19. The network entity of claim 17, wherein the downlink control information message includes an indication that the UE is to apply the second schedule.
20. The network entity of claim 16, wherein, to transmit the message that triggers the UE to transition from the first schedule to the second schedule, the one or more processors are individually or collectively operable to execute the code to cause the network entity to: transmit a wake-up signal associated with an indication that the UE is to perform the radio link failure or beam failure detection operation, wherein the second schedule includes a postponement of a transition from the second state to the uplink-only state.

Description

FAILURE DETECTION FOR COMMUNICATION POWER STATE SWITCHING FIELD OF TECHNOLOGY The following relates to wireless communication, including failure detection for communication power state switching. BACKGROUND Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) . SUMMARY The described techniques relate to improved methods, systems, devices, and apparatuses that support failure detection for communication power state switching. For example, the described techniques provide for a user equipment (UE) to receive, from a network entity in communication with the UE, control information indicating a first schedule for the UE to transition between a set of power states. The power states may include at least an uplink-only power state and a second power state, such as a downlink-and-uplink power state. The UE may determine to perform a radio link failure (RLF) or beam failure (BF) detection operation for a radio link or beam used to communicate with the network entity. The UE may apply a second schedule (e.g.,  different from the first schedule) to transition between the set of power states based on the determination. The second schedule may include a postponement of a transition of the UE between power states. For instance, the second schedule may indicate that the UE is to postpone a transition from the downlink-and-uplink power state to the uplink-only state. The UE may perform an RLF or BF detection operation based on applying the second schedule, e.g., before transitioning to the uplink-only state. In some examples, the control information includes or is an example of downlink control information (DCI) . In some cases, the UE may receive an indication that triggers the UE to perform the RLF or BF detection operation, such as within the DCI or as an indication associated with a wake-up signal (WUS) . For example, the network entity may monitor a quality of the radio link or one or more beams. If the quality becomes poor, the network entity may trigger the UE to apply the second schedule (e.g., to postpone the transition to the uplink-only state) and to perform the RLF or BF detection operation. Additionally, or alternatively, the UE may modify operation of a hybrid automatic repeat request (HARQ) round trip time (RTT) timer based on a power state in which the UE operates. For instance, the UE may pause, resume, initiate, or refrain from initiating the HARQ RTT timer in accordance with the power state. A method for wireless communication by a UE is described. The method may include receiving control information that indicates a first schedule for the UE to transition between a set of multiple power states, where the set of multiple power states includes an uplink-only state during which a primary radio of the UE is used for uplink transmissions, and a second state during which the primary radio of the UE is used at least for downlink transmissions, determining that the UE is to perform a RLF or BF detection operation, and applying a second schedule for the UE to transition between the set of multiple power states based on the determination that the UE is to perform the RLF or BF detection operation. A UE for wireless communication is described. The UE may include one or more memories storing processor-executable code and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to receive control information that indicates a first schedule for the UE to transition between a set of multiple power states, where the set of multiple power  states includes an uplink-only state during which a primary radio of the UE is used for uplink transmissions, and a second state during which the primary radio of the UE is used at least for downlink transmissions, determine that the UE is to perform a RLF or BF detection operation, and apply a second schedule for the UE to transition between the set of multiple power states based on the