# US 12,015,573 B2 · Dynamic configuration of aperiodic sounding reference signal offsets in cellular communications systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,573 B2 - Document ID: US12015573B2 - Status: Granted - Kind: B2 - Application number: 17/439,059 - Filed: 2020-10-12 - Published: 2022-09-22 - Granted: 2024-06-18 - Earliest claimed: 2020-10-12 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Haitong Sun; Yushu Zhang; Huaning Niu; Hong He; Wei Zeng; Chunxuan Ye; Oghenekome Oteri; Sigen Ye; Dawei Zhang; Jie Cui; Yang Tang - Web page: https://patentgrep.com/patent/US12015573B2 ## CPC - 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 41/0803: Configuration setting - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - 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 A cellular base station (BS) which determines an aperiodic sounding reference signal (SRS) triggering offset configuration specifying an offset between an aperiodic SRS trigger received by a user equipment (UE) and transmission of the SRS by the UE. The cellular base station may determine that the SRS triggering offset should be adjusted. In response, the cellular base station may transmit signaling to the UE specifying a new value for the aperiodic SRS triggering offset. The new SRS triggering offset value may be partly based on a minimum timing offset for the UE and may be contained in a medium access control (MAC) control element (CE) or in downlink control information (DCI). Additionally, the new triggering offset value may be applicable for a plurality of component carriers or bandwidth parts. The cellular base station may also determine a new triggering offset value due to conflicts regarding the AP-SRS transmission. ## Claims ### Claim 1 An apparatus, comprising: at least one processor configured to cause a cellular base station (BS) to: determine an aperiodic sounding reference signal (SRS) triggering offset for a user equipment (UE), wherein the aperiodic SRS triggering offset is based on a minimum timing offset received from the UE and specifies a timing offset between an aperiodic SRS trigger received by the UE in a downlink control information (DCI) message and transmission of the SRS by the UE in response to the aperiodic SRS trigger; transmit an initial set of aperiodic SRS triggering offset values for an SRS resource set to the UE via radio resource control (RRC) signaling; and transmit the DCI message to the UE specifying one offset value from the initial set of aperiodic SRS triggering offset values. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the cellular base station is configured to transmit the signaling to the UE specifying a new value for the aperiodic SRS triggering offset in a medium access control (MAC) control element (CE). ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the cellular base station is configured to receive, from the UE, an indication of whether the UE requires a minimum of a 19 symbol timing offset. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the signaling specifies a new value for the aperiodic SRS triggering offset for a plurality of component carriers or bandwidth parts of the UE. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the cellular base station is further configured to determine that the SRS triggering offset should be adjusted by determining that a previously requested AP-SRS was not transmitted. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the cellular base station is further configured to determine that the SRS triggering offset should be adjusted by determining that an AP-SRS transmission collided with, or will collide with, one or more downlink (DL) symbols. ### Claim 7 A method, comprising: by a base station (BS): determining an aperiodic sounding reference signal (SRS) triggering offset for a user equipment (UE), wherein the aperiodic SRS triggering offset is based on a minimum timing offset received from the UE and specifies a timing offset between an aperiodic SRS trigger received by the UE in a downlink control information (DCI) message and transmission of the SRS by the UE in response to the aperiodic SRS trigger; transmitting an initial set of aperiodic SRS triggering offset values for an SRS resource set to the UE via radio resource control (RRC) signaling; and transmitting the DCI message to the UE specifying one offset value from the initial set of aperiodic SRS triggering offset values. ### Claim 8 (depends on 7) The method of claim 7, further comprising transmitting signaling from the BS to the UE specifying a new value for an aperiodic SRS triggering offset in a medium access control (MAC) control element (CE). ### Claim 9 (depends on 7) The method of claim 7, further comprising transmitting signaling from the BS to the UE which specifies a new value for an aperiodic SRS triggering offset for a plurality of component carriers or bandwidth parts of the UE. ### Claim 10 (depends on 7) The method of claim 7, further comprising determining that the SRS triggering offset should be adjusted, based at least in part in response to determining that a previously requested AP-SRS was not transmitted. ### Claim 11 (depends on 7) The method of claim 7, further comprising determining that the SRS triggering offset should be adjusted in response to determining that an attempted AP-SRS transmission collided with, or is anticipated to collide with, one or more downlink (DL) symbols. ### Claim 12 A processor configured to: transmit, to a base station (BS), a minimum timing offset of a user equipment (UE); receive an initial set of aperiodic sounding reference signal (SRS) triggering offset values for an SRS resource set from the BS via radio resource control (RRC) signaling; receive a downlink control information (DCI) message from the BS specifying one value from the initial set of aperiodic SRS triggering offset values, wherein the one value is based on the minimum timing offset received from the UE; receive an aperiodic SRS trigger from the BS in the DCI message; and, transmit an aperiodic SRS based on the received aperiodic SRS trigger, wherein the aperiodic SRS is transmitted in a time slot based at least in part on the one value specified from the initial set of aperiodic SRS triggering offset values. ### Claim 13 (depends on 12) The processor of claim 12, wherein the signaling specifies a new value for the aperiodic SRS triggering offset for a plurality of component carriers or bandwidth parts. ### Claim 14 (depends on 12) The processor of claim 12, wherein the processor is further configured to transmit, to the base station, an indication of whether the UE requires a minimum of a 19 symbol timing offset. ### Claim 15 (depends on 14) The processor of claim 14, wherein the minimum timing offset is reported from a list of pre-stored or preset values. ### Claim 16 (depends on 14) The processor of claim 14, wherein the processor is further configured to transmit both a PUSCH-ProcessingType2 and a PUSCH-ProcessingType2-r16 when it transmits the minimum timing offset of the UE to the base station. ### Claim 17 (depends on 12) The processor of claim 12, wherein the processor is further configured to configure the UE for SRS repetition or slot bundling in which multiple AP-SRS transmissions are consecutively made in response to one or more trigger signals from the base station. ### Claim 18 (depends on 12) The processor of claim 12, wherein the processor is further configured to: receive signaling from the BS specifying a new value for an aperiodic SRS triggering offset in a medium access control (MAC) control element (CE). ### Claim 19 (depends on 12) The processor of claim 12, wherein the processor is further configured to: receive, from the BS, additional signaling indicating that the one value should be adjusted in response to the BS determining that an attempted AP-SRS transmission collided with, or is anticipated to collide with, one or more downlink (DL) symbols. ### Claim 20 (depends on 12) The processor of claim 12, wherein the processor is a baseband processor.