# US 11,909,560 B2 · Switching between channel estimation modes at a user equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,560 B2 - Document ID: US11909560B2 - Status: Granted - Kind: B2 - Application number: 17/302,066 - Filed: 2021-04-22 - Published: 2022-10-27 - Granted: 2024-02-20 - Earliest claimed: 2021-04-22 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Abhinav Sridhar; Jae Won Yoo; Tae Min Kim; Paolo Minero; Ashok Mantravadi; Hari Sankar; Alexei Yurievitch Gorokhov - Web page: https://patentgrep.com/patent/US11909560B2 ## CPC - H04L 25/0224: {using sounding signals} - H04B 17/26: using historical data, averaging values or statistics - H04B 17/364: Delay profiles - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 25/0204: {of multiple channels} - H04L 25/0256: {Channel estimation using minimum mean square error criteria} - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 52/0245: {according to signal strength} - H04W 52/0258: {controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day} - H04W 74/0825: {with collision detection} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine an actual power delay profile (PDP) associated with a channel between the UE and a base station, wherein the actual PDP indicates an averaged power level of the channel over a period of time. The UE may determine whether a channel estimation mode switching event is satisfied. The UE may switch, based at least in part on the channel estimation mode switching event being satisfied, between a first channel estimation mode based at least in part on the actual PDP and a second channel estimation mode based at least in part on a template PDP. Numerous other aspects are described. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), comprising: determining an actual power delay profile (PDP) associated with a channel between the UE and a network node, wherein the actual PDP indicates an averaged power level of the channel over a period of time; determining whether a channel estimation mode switching event is satisfied; and switching, based at least in part on the channel estimation mode switching event being satisfied, between a first channel estimation mode based at least in part on the actual PDP and a second channel estimation mode based at least in part on a template PDP, wherein the first channel estimation mode is more accurate than the second channel estimation mode before switching, and the second channel estimation mode is more accurate than the first channel estimation mode after the switching. ### Claim 2 (depends on 1) The method of claim 1, wherein: the first channel estimation mode associated with the actual PDP is a minimum mean square error channel estimation mode; and the second channel estimation mode associated with the template PDP is an approximate minimum mean square error channel estimation mode. ### Claim 3 (depends on 1) The method of claim 1, wherein determining the actual PDP associated with the channel is based at least in part on a reference signal received from the network node, wherein the reference signal is one of a tracking reference signal or a synchronization signal block. ### Claim 4 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied when a physical downlink shared channel allocation size does not satisfy a threshold level. ### Claim 5 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied based at least in part on a sleep type and a sleep duration during a connected mode discontinuous reception. ### Claim 6 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied based at least in part on a tracking reference signal allocation in a frequency spectrum within a bandwidth part. ### Claim 7 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied depending on the actual PDP being based at least in part on a tracking reference signal or a synchronization signal block. ### Claim 8 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied when a signal-to-noise ratio does not satisfy a threshold level. ### Claim 9 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied based at least in part on a collision detection of reference signals transmitted in neighboring cells. ### Claim 10 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied based at least in part on an occurrence of a PDP reset event, wherein the PDP reset event includes a handover or a configuration of another carrier. ### Claim 11 (depends on 1) The method of claim 1, wherein the channel estimation mode switching event is satisfied depending on whether the actual PDP is based at least in part on a primary component carrier or a secondary component carrier when the UE is configured for carrier aggregation. ### Claim 12 A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors, coupled to the memory, configured to: determine an actual power delay profile (PDP) associated with a channel between the UE and a network node, wherein the actual PDP indicates an averaged power level of the channel over a period of time; determine whether a channel estimation mode switching event is satisfied; and switch, based at least in part on the channel estimation mode switching event being satisfied, between a first channel estimation mode based at least in part on the actual PDP and a second channel estimation mode based at least in part on a template PDP, wherein the first channel estimation mode is more accurate than the second channel estimation mode before switching, and the second channel estimation mode is more accurate than the first channel estimation mode after the switching. ### Claim 13 (depends on 12) The UE of claim 12, wherein: the first channel estimation mode associated with the actual PDP is a minimum mean square error channel estimation mode; and the second channel estimation mode associated with the template PDP is an approximate minimum mean square error channel estimation mode. ### Claim 14 (depends on 12) The UE of claim 12, wherein the one or more processors, when determining the actual PDP associated with the channel, are configured to determine the actual PDP based at least in part on a reference signal received from the network node, wherein the reference signal is one of a tracking reference signal or a synchronization signal block. ### Claim 15 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied when a physical downlink shared channel allocation size does not satisfy a threshold level. ### Claim 16 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied based at least in part on a sleep type and a sleep duration during a connected mode discontinuous reception. ### Claim 17 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied based at least in part on a tracking reference signal allocation in a frequency spectrum within a bandwidth part. ### Claim 18 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied depending on the actual PDP being based at least in part on a tracking reference signal or a synchronization signal block. ### Claim 19 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied when a signal-to-noise ratio does not satisfy a threshold level. ### Claim 20 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied based at least in part on a collision detection of reference signals transmitted in neighboring cells. ### Claim 21 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied based at least in part on an occurrence of a PDP reset event, wherein the PDP reset event includes a handover or a configuration of another carrier. ### Claim 22 (depends on 12) The UE of claim 12, wherein the channel estimation mode switching event is satisfied depending on whether the actual PDP is based at least in part on a primary component carrier or a secondary component carrier when the UE is configured for carrier aggregation. ### Claim 23 A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: determine an actual power delay profile (PDP) associated with a channel between the UE and a network node, wherein the actual PDP indicates an averaged power level of the channel over a period of time; determine whether a channel estimation mode switching event is satisfied; and switch, based at least in part on the channel estimation mode switching event being satisfied, between a first channel estimation mode based at least in part on the actual PDP and a second channel estimation mode based at least in part on a template PDP, wherein the first channel estimation mode is more accurate than the second channel estimation mode before switching, and the second channel estimation mode is more accurate than the first channel estimation mode after the switching. ### Claim 24 (depends on 23) The non-transitory computer-readable medium of claim 23, wherein: the first channel estimation mode associated with the actual PDP is a minimum mean square error channel estimation mode; and the second channel estimation mode associated with the template PDP is an approximate minimum mean square error channel estimation mode. ### Claim 25 (depends on 23) The non-transitory computer-readable medium of claim 23, wherein: the channel estimation mode switching event is satisfied when a physical downlink shared channel allocation size does not satisfy a threshold level; the channel estimation mode switching event is satisfied based at least in part on a sleep type and a sleep duration during a connected mode discontinuous reception; the channel estimation mode switching event is satisfied based at least in part on a tracking reference signal allocation in a frequency spectrum within a bandwidth part; or the channel estimation mode switching event is satisfied depending on the actual PDP being based at least in part on a tracking reference signal or a synchronization signal block. ### Claim 26 (depends on 23) The non-transitory computer-readable medium of claim 23, wherein: the channel estimation mode switching event is satisfied when a signal-to-noise ratio does not satisfy a threshold level; the channel estimation mode switching event is satisfied based at least in part on a collision detection of reference signals transmitted in neighboring cells; the channel estimation mode switching event is satisfied based at least in part on an occurrence of a PDP reset event, wherein the PDP reset event includes a handover or a configuration of another carrier; or the channel estimation mode switching event is satisfied depending on whether the actual PDP is based at least in part on a primary component carrier or a secondary component carrier when the UE is configured for carrier aggregation. ### Claim 27 An apparatus for wireless communication, comprising: means for determining an actual power delay profile (PDP) associated with a channel between the apparatus and a network node, wherein the actual PDP indicates an averaged power level of the channel over a period of time; means for determining whether a channel estimation mode switching event is satisfied; and means for switching, based at least in part on the channel estimation mode switching event being satisfied, between a first channel estimation mode based at least in part on the actual PDP and a second channel estimation mode based at least in part on a template PDP, wherein the first channel estimation mode is more accurate than the second channel estimation mode before switching, and the second channel estimation mode is more accurate than the first channel estimation mode after the switching. ### Claim 28 (depends on 27) The apparatus of claim 27, wherein: the first channel estimation mode associated with the actual PDP is a minimum mean square error channel estimation mode; and the second channel estimation mode associated with the template PDP is an approximate minimum mean square error channel estimation mode. ### Claim 29 (depends on 27) The apparatus of claim 27, wherein: the channel estimation mode switching event is satisfied when a physical downlink shared channel allocation size does not satisfy a threshold level; the channel estimation mode switching event is satisfied based at least in part on a sleep type and a sleep duration during a connected mode discontinuous reception; the channel estimation mode switching event is satisfied based at least in part on a tracking reference signal allocation in a frequency spectrum within a bandwidth part; or the channel estimation mode switching event is satisfied depending on the actual PDP being based at least in part on a tracking reference signal or a synchronization signal block. ### Claim 30 (depends on 27) The apparatus of claim 27, wherein: the channel estimation mode switching event is satisfied when a signal-to-noise ratio does not satisfy a threshold level; the channel estimation mode switching event is satisfied based at least in part on a collision detection of reference signals transmitted in neighboring cells; the channel estimation mode switching event is satisfied based at least in part on an occurrence of a PDP reset event, wherein the PDP reset event includes a handover or a configuration of another carrier; or the channel estimation mode switching event is satisfied depending on whether the actual PDP is based at least in part on a primary component carrier or a secondary component carrier when the apparatus is configured for carrier aggregation.