Channel measurement techniques in discontinuous reception scenarios
地域：
CA
CA San Diego
摘要
Methods, systems, and devices for wireless communications are described for configuring a user equipment (UE) for reference signal measurement while operating according to a discontinuous reception (DRX) configuration. The DRX configuration may include periodic DRX ON-durations, during which the UE is to be in an active mode for reception and transmission of signals, and between which the UE may transition to a low-power inactive mode. One or more reference signals may be scheduled for transmission by the base station during periods in which the UE may be in the inactive mode, and the UE may skip monitoring one or more of the reference signals while in the inactive mode. For one or more reference signal occasions, the UE may determine, based at least in part on a change in a channel quality metric, to be in a limited active mode in order to measure the reference signal.
說明書
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The present application for patent claims the benefit of U.S. Provisional Patent Application No. 62/901,954 by RUNGTA et al., entitled “CHANNEL MEASUREMENT TECHNIQUES IN DISCONTINUOUS RECEPTION SCENARIOS,” filed Sep. 18, 2019, assigned to the assignee hereof, and expressly incorporated by reference herein.
The following relates generally to wireless communications, and more specifically to channel measurement techniques in discontinuous reception scenarios.
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 frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM).
權(quán)利要求
What is claimed is:1. A method for wireless communications at a user equipment (UE), comprising:receiving a discontinuous reception cycle configuration that indicates a plurality of discontinuous reception cycles within a discontinuous reception period that each have an ON-duration during which the UE is to be in an active mode to monitor for transmissions from an access network entity, and wherein the UE transitions to an inactive mode after one or more of the ON-durations until a subsequent ON-duration, and at least a first channel measurement associated with a channel measurement schedule occurs when the UE is to be in the inactive mode of the discontinuous reception cycle configuration; skipping at least one channel measurement prior to the first channel measurement based at least in part on the UE being in the inactive mode of the discontinuous reception cycle at a corresponding time of the at least one prior channel measurement; and setting the UE to be in a limited active mode to perform the first channel measurement based at least in part on a change in a channel quality metric exceeding a threshold value for at least a predetermined period before the first channel measurement, the predetermined period including at least one skipped channel measurement. 2. The method of claim 1 , wherein:the predetermined period corresponds to a predetermined quantity of skipped channel measurements. 3. The method of claim 2 , further comprising:updating a counter of skipped channel measurements upon each occurrence of skipping a channel measurement; and comparing a value of the counter to the predetermined quantity of skipped prior channel measurements to determine to maintain the UE in the limited active mode to perform the first channel measurement. 4. The method of claim 3 , wherein the counter of skipped channel measurements is updated when the UE transitions from the inactive mode to the active mode of the discontinuous reception cycle. 5. The method of claim 3 , further comprising:performing the first channel measurement; and resetting the counter of skipped channel measurements to an initial value responsive to the performing the first channel measurement. 6. The method of claim 1 , wherein the predetermined period is based on one or more of a preconfigured time duration, a magnitude of the change in the channel quality metric, or any combinations thereof. 7. The method of claim 6 , wherein a duration of the predetermined period is longer for a smaller magnitude of change in the channel quality metric, and is shorter for a larger magnitude of change in the channel quality metric. 8. The method of claim 1 , wherein the channel quality metric comprises one or more of a reference signal received power (RSRP), a reference signal received quality (RSRQ), or a signal to noise ratio (SNR), or any combinations thereof, that is determined based at least in part on one or more signals received from the access network entity. 9. The method of claim 1 , further comprising:comparing a current value of the channel quality metric to a prior value of the channel quality metric prior to transitioning to the inactive mode. 10. The method of claim 9 , further comprising:storing, after the comparing, the current value of the channel quality metric to replace the prior value of the channel quality metric. 11. The method of claim 1 , wherein the setting the UE to be in a limited active mode to perform the first channel measurement further comprises:determining that at least a predetermined number of prior channel measurements have been skipped based on the UE being in the inactive mode during corresponding scheduled channel measurements of the channel measurement schedule, wherein the predetermined period corresponds to the predetermined number of prior channel measurements; and determining that a difference between a current channel quality metric and a prior channel quality metric exceeds the threshold value. 12. The method of claim 1 , wherein the setting the UE to be in the limited active mode further comprises:maintaining channel measurement components of the UE in an ON state and deactivating physical downlink control channel (PDCCH) decoding components following an ON-duration of a discontinuous reception cycle that is prior to the first channel measurement; performing the first channel measurement; and deactivating, responsive to performing the first channel measurement, the channel measurement components. 13. The method of claim 12 , wherein the channel measurement components are maintained in the ON state after expiration of the ON-duration based on the first channel measurement being within a predetermined time from the expiration of the ON-duration. 14. The method of claim 1 , wherein the setting the UE to be in the limited active mode further comprises:transitioning channel measurement components and physical downlink control channel (PDCCH) decoding components of the UE to an inactive state following an ON-duration of a discontinuous reception cycle that is prior to the first channel measurement; transitioning the channel measurement components to an ON state based at least in part on the channel measurement schedule associated with the first channel measurement; performing the first channel measurement; and deactivating, responsive to performing the first channel measurement, the channel measurement components. 15. The method of claim 14 , wherein the channel measurement components are transitioned to the ON state after expiration of the ON-duration based on the first channel measurement being between a predetermined time from the expiration of the ON-duration and from a start of a subsequent ON-duration. 16. The method of claim 1 , wherein the setting the UE to be in the limited active mode further comprises:transitioning channel measurement components and physical downlink control channel (PDCCH) decoding components of the UE to an inactive state following an ON-duration of a discontinuous reception cycle that is prior to the first channel measurement; transitioning the channel measurement components to an ON state based at least in part on the channel measurement schedule associated with the first channel measurement; performing the first channel measurement; and transitioning the PDCCH decoding components to the ON state for a subsequent ON-duration. 17. The method of claim 16 , wherein the channel measurement components are transitioned to the ON state prior to the subsequent ON-duration based on the first channel measurement being within a predetermined time from a start of the subsequent ON-duration. 18. An apparatus for wireless communications at a user equipment (UE), comprising:a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to:receive a discontinuous reception cycle configuration that indicates a plurality of discontinuous reception cycles within a discontinuous reception period that each have an ON-duration during which the UE is to be in an active mode to monitor for transmissions from an access network entity, and wherein the UE transitions to an inactive mode after one or more of the ON-durations until a subsequent ON-duration, and at least a first channel measurement associated with a channel measurement schedule occurs when the UE is to be in the inactive mode of the discontinuous reception cycle configuration; skip at least one channel measurement prior to the first channel measurement based at least in part on the UE being in the inactive mode of the discontinuous reception cycle at a corresponding time of the at least one prior channel measurement; and set the UE to be in a limited active mode to perform the first channel measurement based at least in part on a change in a channel quality metric exceeding a threshold value for at least a predetermined period before the first channel measurement, the predetermined period including at least one skipped channel measurement. 19. The apparatus of claim 18 , whereinthe predetermined period corresponds to a predetermined number of skipped prior channel measurements, and wherein the instructions are further executable by the processor to cause the apparatus to: update a counter of skipped channel measurements upon each occurrence of skipping a channel measurement; and compare a value of the counter to the predetermined number of skipped prior channel measurements to determine to maintain the UE in the active mode to perform the first channel measurement. 20. The apparatus of claim 19 , wherein the instructions are further executable by the processor to cause the apparatus to:perform the first channel measurement; and reset the counter of skipped channel measurements to an initial value responsive to the performing the first channel measurement. 21. The apparatus of claim 18 , wherein the predetermined period is based on one or more of a preconfigured time duration, a magnitude of the change in the channel quality metric, or any combinations thereof. 22. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:compare a current value of the channel quality metric to a prior value of the channel quality metric prior to transitioning to the inactive mode; and store, after the comparing, the current value of the channel quality metric to replace the prior value of the channel quality metric. 23. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:determine that at least a predetermined number of prior channel measurements have been skipped based on the UE being in the inactive mode during corresponding scheduled channel measurements of the channel measurement schedule, wherein the predetermined period corresponds to the predetermined number of prior channel measurements; and determine that a difference between a current channel quality metric and a prior channel quality metric exceeds the threshold value. 24. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:maintain channel measurement components of the UE in an ON state and deactivating physical downlink control channel (PDCCH) decoding components following an ON-duration of a discontinuous reception cycle that is prior to the first channel measurement; perform the first channel measurement; and deactivate, responsive to performing the first channel measurement, the channel measurement components. 25. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:transition channel measurement components and physical downlink control channel (PDCCH) decoding components of the UE to an inactive state following an ON-duration of a discontinuous reception cycle that is prior to the first channel measurement; transition the channel measurement components to an ON state based at least in part on the channel measurement schedule associated with the first channel measurement; perform the first channel measurement; and deactivate, responsive to performing the first channel measurement, the channel measurement components. 26. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:transition channel measurement components and physical downlink control channel (PDCCH) decoding components of the UE to an inactive state following an ON-duration of a discontinuous reception cycle that is prior to the first channel measurement; transition the channel measurement components to an ON state based at least in part on the channel measurement schedule associated with the first channel measurement; perform the first channel measurement; and transition the PDCCH decoding components to the ON state for a subsequent ON-duration. 27. An apparatus for wireless communications at a user equipment (UE), comprising:means for receiving a discontinuous reception cycle configuration that indicates a plurality of discontinuous reception cycles within a discontinuous reception period that each have an ON-duration during which the UE is to be in an active mode to monitor for transmissions from an access network entity, and wherein the UE transitions to an inactive mode after one or more of the ON-durations until a subsequent ON-duration, and at least a first channel measurement associated with a channel measurement schedule occurs when the UE is to be in the inactive mode of the discontinuous reception cycle configuration; means for skipping at least one channel measurement prior to the first channel measurement based at least in part on the UE being in the inactive mode of the discontinuous reception cycle at a corresponding time of the at least one prior channel measurement; and means for setting the UE to be in a limited active mode to perform the first channel measurement based at least in part on a change in a channel quality metric exceeding a threshold value for at least a predetermined period before the first channel measurement, the predetermined period including at least one skipped channel measurement. 28. The apparatus of claim 27 , further comprising:means for determining that at least a predetermined number of prior channel measurements have been skipped based on the UE being in the inactive mode during corresponding scheduled channel measurements of the channel measurement schedule, wherein the predetermined period corresponds to the predetermined number of prior channel measurements; and means for determining that a difference between a current channel quality metric and a prior channel quality metric exceeds the threshold value. 29. A non-transitory computer-readable medium storing code for wireless communications at a user equipment (UE), the code comprising instructions executable by a processor to:receive a discontinuous reception cycle configuration that indicates a plurality of discontinuous reception cycles within a discontinuous reception period that each have an ON-duration during which the UE is to be in an active mode to monitor for transmissions from an access network entity, and wherein the UE transitions to an inactive mode after one or more of the ON-durations until a subsequent ON-duration, and at least a first channel measurement associated with a channel measurement schedule occurs when the UE is to be in the inactive mode of the discontinuous reception cycle configuration; skip at least one channel measurement prior to the first channel measurement based at least in part on the UE being in the inactive mode of the discontinuous reception cycle at a corresponding time of the at least one prior channel measurement; and set the UE to be in a limited active mode to perform the first channel measurement based at least in part on a change in a channel quality metric exceeding a threshold value for at least a predetermined period before the first channel measurement, the predetermined period including at least one skipped channel measurement. 30. The non-transitory computer-readable medium of claim 29 , wherein the instructions are further executable by the processor to:determine that at least a predetermined number of prior channel measurements have been skipped based on the UE being in the inactive mode during corresponding scheduled channel measurements of the channel measurement schedule, wherein the predetermined period corresponds to the predetermined number of prior channel measurements; and determine that a difference between a current channel quality metric and a prior channel quality metric exceeds the threshold value.
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