# US 10,873,481 B2 · Reference signal transmission window and timing considerations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,481 B2 - Document ID: US10873481B2 - Status: Granted - Kind: B2 - Application number: 16/198,624 - Filed: 2018-11-21 - Published: 2019-05-30 - Granted: 2020-12-22 - Earliest claimed: 2017-11-27 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alexandros Manolakos; Alberto Rico Alvarino; Ayan Sengupta; Wanshi Chen; Peter Gaal - Web page: https://patentgrep.com/patent/US10873481B2 ## CPC - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 25/0202: {Channel estimation} - 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0078: {Timing of allocation} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 25/0226: {sounding signals per se} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/001: {the frequencies being arranged in component carriers} - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods, systems, and devices for wireless communications are described. These wireless communications may include channel estimation procedures between communicating devices such as a base station and user equipment (UE). For example, the UE may receive, from the base station, a resource grant triggering a given reference signal configuration. Based at least in part on the type of reference signal configuration, the UE (e.g., and the base station) may determine a timing offset relative to the resource grant. The UE may transmit (and the base station may receive) the reference signal based at least in part on the timing offset. In some cases, the reference signal may be transmitted in a transmission opportunity of a set of transmission opportunities, where the set of transmission opportunities is determined based at least in part on the reference signal configuration. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving, from a base station, a resource grant triggering an aperiodic sounding reference signal configuration; determining a timing offset for transmission of an aperiodic sounding reference signal by the UE, wherein the timing offset is relative to the received resource grant and based at least in part on the aperiodic sounding reference signal configuration; and transmitting the aperiodic sounding reference signal based at least in part on the determined timing offset. ### Claim 2 (depends on 1) The method of claim 1, further comprising: identifying a transmission opportunity window comprising a plurality of transmission opportunities based at least in part on the timing offset, wherein the aperiodic sounding reference signal is transmitted during a transmission opportunity of the plurality of transmission opportunities. ### Claim 3 (depends on 2) The method of claim 2, further comprising: determining a duration of the transmission opportunity window or a periodicity of the plurality of transmission opportunities based at least in part on the aperiodic sounding reference signal configuration. ### Claim 4 (depends on 3) The method of claim 3, wherein the periodicity of the plurality of transmission opportunities comprises a number of symbols, a number of slots, a number of bandwidth parts, or a combination thereof. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving a channel state information reference signal (CSI-RS) based at least in part on the aperiodic sounding reference signal configuration; and identifying a precoder for the aperiodic sounding reference signal based at least in part on the CSI-RS. ### Claim 6 (depends on 1) The method of claim 1, wherein the timing offset is based at least in part on a processing capability of the UE, a delay associated with the aperiodic sounding reference signal configuration, or a combination thereof. ### Claim 7 (depends on 6) The method of claim 6, further comprising: indicating the processing capability of the UE to the base station. ### Claim 8 (depends on 1) The method of claim 1, further comprising: receiving a data transmission based at least in part on the resource grant; and modulating the aperiodic sounding reference signal based at least in part on the data transmission. ### Claim 9 (depends on 1) The method of claim 1, further comprising: receiving the aperiodic sounding reference signal configuration in a control transmission that precedes the resource grant. ### Claim 10 (depends on 1) The method of claim 1, wherein a duration of the timing offset is based at least in part on a directionality of the resource grant, the directionality of the resource grant comprising downlink or uplink. ### Claim 11 (depends on 1) The method of claim 1, wherein the aperiodic sounding reference signal configuration comprises an indication of a use case for the aperiodic sounding reference signal. ### Claim 12 (depends on 11) The method of claim 11, wherein the indicated use case comprises an uplink channel state information acquisition, or a downlink channel state information acquisition, or an uplink non-codebook-based precoding, or an uplink codebook-based precoding, or an uplink analog beamforming. ### Claim 13 (depends on 1) The method of claim 1, wherein the aperiodic sounding reference signal configuration comprises a first timing offset for a first component carrier and a second timing offset for a second component carrier. ### Claim 14 (depends on 13) The method of claim 13, wherein the first component carrier and the second component carrier operate in different radio frequency spectrum bands. ### Claim 15 (depends on 1) The method of claim 1, wherein the aperiodic sounding reference signal transmitted by the UE based at least in part on the determined timing offset comprises a sounding reference signal. ### Claim 16 A method for wireless communication at a base station, comprising: transmitting, to a user equipment (UE), a resource grant indicating an aperiodic sounding reference signal configuration; determining a timing offset for transmission of an aperiodic sounding reference signal by the UE, wherein the timing offset is relative to the transmitted resource grant and based at least in part on the aperiodic sounding reference signal configuration; and receiving the aperiodic sounding reference signal based at least in part on the determined timing offset. ### Claim 17 (depends on 16) The method of claim 16, further comprising: identifying a transmission opportunity window comprising a plurality of transmission opportunities based at least in part on the timing offset, wherein the aperiodic sounding reference signal is received during a transmission opportunity of the plurality of transmission opportunities. ### Claim 18 (depends on 16) The method of claim 16, further comprising: transmitting a channel state information reference signal (CSI-RS) based at least in part on the aperiodic sounding reference signal configuration. ### Claim 19 (depends on 16) The method of claim 16, wherein the timing offset is based at least in part on a processing capability of the UE, a delay associated with the aperiodic sounding reference signal configuration, or a combination thereof. ### Claim 20 (depends on 16) The method of claim 16, further comprising: indicating the aperiodic sounding reference signal configuration in a control transmission that precedes the resource grant. ### Claim 21 (depends on 16) The method of claim 16, wherein a duration of the timing offset is based at least in part on a directionality of the resource grant, the directionality of the resource grant comprising downlink or uplink. ### Claim 22 (depends on 16) The method of claim 16, wherein the aperiodic sounding reference signal configuration comprises an indication of a use case for the aperiodic sounding reference signal. ### Claim 23 (depends on 16) The method of claim 16, wherein the aperiodic sounding reference signal configuration comprises a first timing offset for a first component carrier and a second timing offset for a second component carrier. ### Claim 24 An apparatus for wireless communication 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, from a base station, a resource grant triggering an aperiodic sounding reference signal configuration; determine a timing offset for transmission of an aperiodic sounding reference signal by the UE, wherein the timing offset is relative to the received resource grant and based at least in part on the aperiodic sounding reference signal configuration; and transmit the aperiodic sounding reference signal based at least in part on the determined timing offset. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the instructions are further executable by the processor to cause the apparatus to: identify a transmission opportunity window comprising a plurality of transmission opportunities based at least in part on the timing offset, wherein the aperiodic sounding reference signal is transmitted during a transmission opportunity of the plurality of transmission opportunities. ### Claim 26 (depends on 24) The apparatus of claim 24, wherein the instructions are further executable by the processor to cause the apparatus to: receive a channel state information reference signal (CSI-RS) based at least in part on the aperiodic sounding reference signal configuration; and identify a precoder for the aperiodic sounding reference signal based at least in part on the CSI-RS. ### Claim 27 (depends on 24) The apparatus of claim 24, wherein the aperiodic sounding reference signal configuration comprises an indication of a use case for the aperiodic sounding reference signal. ### Claim 28 (depends on 24) The apparatus of claim 24, wherein the aperiodic sounding reference signal configuration comprises a first timing offset for a first component carrier and a second timing offset for a second component carrier. ### Claim 29 An apparatus for wireless communication at a base station, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit, to a user equipment (UE), a resource grant indicating an aperiodic sounding reference signal configuration; determine a timing offset for transmission of an aperiodic sounding reference signal by the UE, wherein the timing offset is relative to the transmitted resource grant and based at least in part on the aperiodic sounding reference signal configuration; and receive the aperiodic sounding reference signal based at least in part on the determined timing offset. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the instructions are further executable by the processor to cause the apparatus to: identify a transmission opportunity window comprising a plurality of transmission opportunities based at least in part on the timing offset, wherein the aperiodic sounding reference signal is received during a transmission opportunity of the plurality of transmission opportunities.