# US 2017/0290041 A1 · Sounding reference signal triggering for enhanced carrier aggregation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0290041 A1 - Document ID: US20170290041A1 - Status: Published application - Kind: A1 - Application number: 15/474,840 - Filed: 2017-03-30 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alberto Rico Alvarino; Wanshi Chen; Peter Gaal - Web page: https://patentgrep.com/patent/US20170290041A1 ## CPC - H04W 72/566: of the information or information source or recipient - 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04W 52/325: {Power control of control or pilot channels} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/1268: of uplink data flows - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods, systems, and devices for wireless communication are described. A method at a user equipment (UE) includes receiving signaling that indicates a carrier aggregation (CA) configuration (having carriers configured for UL and downlink (DL) data transmissions) and an auxiliary uplink (UL) configuration (having carriers configured for UL reference signal transmissions). The method also includes receiving a resource assignment on a DL carrier of the CA configuration, and transmitting an aperiodic sounding reference signal (A-SRS) using the one or more carriers of the auxiliary UL configuration based at least in part on the received resource assignment. Another method is performed by a UE having a CA configuration and an A-SRS configuration, including receiving a resource assignment on a DL carrier in the CA configuration, detecting a trigger for transmitting an A-SRS, determining UL resources of the A-SRS configuration for transmitting the A-SRS, and transmitting the A-SRS on the determined UL resources. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), comprising: identifying a carrier aggregation (CA) configuration and an aperiodic sounding reference signal (A-SRS) configuration of the UE, wherein the A-SRS configuration comprises one or more component carriers (CCs) on which the UE does not perform uplink (UL) data transmissions; receiving a resource assignment on a downlink (DL) CC in the CA configuration; detecting a trigger for transmitting one or more A-SRS transmissions based at least in part on a downlink control information (DCI) format of the resource assignment; determining one or more CCs of the A-SRS configuration for transmitting the one or more A-SRS transmissions based at least in part on the DCI format of the resource assignment; and transmitting the one or more A-SRS transmissions on the one or more determined CCs of the A-SRS configuration. ### Claim 2 (depends on 1) The method of claim 1, wherein one or more of the CCs of the A-SRS configuration comprise one or more auxiliary UL CCs, the one or more auxiliary UL CCs being configured for UL reference signal transmissions and not configured for UL data transmissions. ### Claim 3 (depends on 2) The method of claim 2, wherein receiving the resource assignment comprises: identifying power control information in a field of the DCI format that indicates an A-SRS transmitter power control (TPC) command, wherein the one or more A-SRS transmissions are transmitted using a transmit power based at least in part on the power control information. ### Claim 4 (depends on 1) The method of claim 1, further comprising: identifying the one or more CCs of the A-SRS configuration based at least in part on a plurality of bits of the resource assignment configured according to the DCI format. ### Claim 5 (depends on 1) The method of claim 1, wherein the resource assignment comprises a sounding reference signal radio network temporary identifier (SRS-RNTI), wherein the SRS-RNTI triggers a plurality of A-SRS transmissions in a plurality of UL resources of the A-SRS configuration. ### Claim 6 (depends on 1) The method of claim 1, further comprising: identifying additional uplink transmissions to be transmitted simultaneously with the one or more A-SRS transmissions; and determining whether to transmit the additional uplink transmissions or the one or more A-SRS transmissions, or both, based at least in part on a prioritization. ### Claim 7 (depends on 6) The method of claim 6, wherein transmitting the one or more A-SRS transmissions is based at least in part on determining to transmit the one or more A-SRS transmissions according to the prioritization. ### Claim 8 (depends on 1) The method of claim 1, further comprising: identifying additional uplink transmissions to be transmitted simultaneously with the one or more A-SRS transmissions; and transmitting the one or more A-SRS transmissions instead of the additional uplink transmissions, wherein the additional uplink transmissions comprise a physical uplink shared channel (PUSCH) transmission on one or more component carriers of the CA configuration. ### Claim 9 (depends on 1) The method of claim 1, wherein a DL carrier of the CA configuration and one of the one or more CCs of the A-SRS configuration share frequency resources. ### Claim 10 A method of wireless communication performed by a base station, comprising: identifying a carrier aggregation (CA) configuration and an aperiodic sounding reference signal (A-SRS) configuration of one or more user equipments (UEs), wherein the A-SRS configuration comprises one or more component carriers (CCs) on which the one or more UEs do not perform uplink (UL) data transmissions; transmitting a resource assignment on a downlink (DL) CC in the CA configuration, the resource assignment comprising a trigger for one or more UEs to transmit one or more A-SRS transmissions based at least in part on a downlink control information (DCI) format of the resource assignment, wherein one or more CCs of the A-SRS configuration for transmitting the one or more A-SRS transmissions are identified based at least in part on the DCI format of the resource assignment; and receiving A-SRS transmissions from the one or more UEs on CCs identified by the DCI format. ### Claim 11 (depends on 10) The method of claim 10, wherein the one or more CCs of the A-SRS configuration comprise one or more auxiliary UL CCs, the one or more auxiliary UL CCs being configured for UL reference signal transmissions and not configured for UL data transmissions. ### Claim 12 (depends on 10) The method of claim 10, wherein the one or more CCs of the A-SRS configuration are identified based at least in part on a plurality of bits of the resource assignment configured according to the DCI format. ### Claim 13 (depends on 11) The method of claim 11, further comprising: transmitting power control information in a field of the DCI format that indicates an A-SRS transmitter power control (TPC) command. ### Claim 14 (depends on 10) The method of claim 10, wherein the resource assignment comprises a sounding reference signal radio network temporary identifier (SRS-RNTI), wherein the SRS-RNTI triggers a plurality of A-SRS transmissions in a plurality of UL resources of the A-SRS configuration. ### Claim 15 (depends on 10) The method of claim 10, wherein a DL carrier of the CA configuration and one of the one or more CCs of the A-SRS configuration share frequency resources. ### Claim 16 A mobile device for wireless communication, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the mobile device to: identify a carrier aggregation (CA) configuration and an aperiodic sounding reference signal (A-SRS) configuration of the mobile device, wherein the A-SRS configuration comprises one or more component carriers (CCs) on which the mobile device does not perform uplink (UL) data transmissions; receive a resource assignment on a downlink (DL) CC in the CA configuration; detect a trigger for transmitting one or more A-SRS transmissions based at least in part on a downlink control information (DCI) format of the resource assignment; determine one or more CCs of the A-SRS configuration for transmitting the one or more A-SRS transmissions based at least in part on the DCI format of the resource assignment; and transmit the one or more A-SRS transmissions on the one or more determined CCs of the A-SRS configuration. ### Claim 17 (depends on 16) The mobile device of claim 16, wherein one or more of the CCs of the A-SRS configuration comprise one or more auxiliary UL CCs, the one or more auxiliary UL CCs being configured for UL reference signal transmissions and not configured for UL data transmissions. ### Claim 18 (depends on 17) The mobile device of claim 17, wherein the instructions are executable by the processor to cause the mobile device to: identify power control information in a field of the DCI format that indicates an A-SRS transmitter power control (TPC) command; and transmit the one or more A-SRS transmissions using a transmit power based at least in part on the power control information. ### Claim 19 (depends on 16) The mobile device of claim 16, wherein the instructions are executable by the processor to cause the mobile device to: identify the one or more CCs of the A-SRS configuration based at least in part on a plurality of bits of the resource assignment configured according to the DCI format. ### Claim 20 (depends on 16) The mobile device of claim 16, wherein the resource assignment comprises a sounding reference signal radio network temporary identifier (SRS-RNTI), wherein the SRS-RNTI triggers a plurality of A-SRS transmissions in a plurality of UL resources of the A-SRS configuration. ### Claim 21 (depends on 16) The mobile device of claim 16, wherein the instructions are executable by the processor to cause the mobile device to: identify additional uplink transmissions to be transmitted simultaneously with the one or more A-SRS transmissions; and determine whether to transmit the additional uplink transmissions or the one or more A-SRS transmissions, or both, based at least in part on a prioritization. ### Claim 22 (depends on 21) The mobile device of claim 21, wherein the instructions are executable by the processor to cause the mobile device to: transmit the one or more A-SRS transmissions based at least in part on determining to transmit the one or more A-SRS transmissions according to the prioritization. ### Claim 23 (depends on 16) The mobile device of claim 16, wherein the instructions are executable by the processor to cause the mobile device to: identify additional uplink transmissions to be transmitted simultaneously with the one or more A-SRS transmissions; and transmit the one or more A-SRS transmissions instead of the additional uplink transmissions, wherein the additional uplink transmissions comprise a physical uplink shared channel (PUSCH) transmission on one or more component carriers of the CA configuration. ### Claim 24 (depends on 16) The mobile device of claim 16, wherein a DL carrier of the CA configuration and one of the one or more CCs of the A-SRS configuration share frequency resources. ### Claim 25 A network device for wireless, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the network device to: identify a carrier aggregation (CA) configuration and an aperiodic sounding reference signal (A-SRS) configuration of one or more user equipments (UEs), wherein the A-SRS configuration comprises one or more component carriers (CCs) on which the one or more UEs do not perform uplink (UL) data transmissions; transmit a resource assignment on a downlink CC in the CA configuration, the resource assignment comprising a trigger for one or more UEs to transmit one or more A-SRS transmissions based at least in part on a downlink control information (DCI) format of the resource assignment, wherein one or more CCs of the A-SRS configuration for transmitting the one or more A-SRS transmissions are identified based at least in part on the DCI format of the resource assignment; and receive A-SRS transmissions from the one or more UEs on CCs identified by the DCI format. ### Claim 26 (depends on 25) The network device of claim 25, wherein the one or more CCs of the A-SRS configuration comprise one or more auxiliary UL CCs, the one or more auxiliary UL CCs being configured for UL reference signal transmissions and not configured for UL data transmissions. ### Claim 27 (depends on 26) The network device of claim 26, wherein the instructions are executable by the processor to cause the network device to: transmit power control information in a field of the DCI format that indicates an A-SRS transmitter power control (TPC) command. ### Claim 28 (depends on 25) The network device of claim 25, wherein the one or more CCs of the A-SRS configuration are identified based at least in part on a plurality of bits of the resource assignment configured according to the DCI format. ### Claim 29 (depends on 25) The network device of claim 25, wherein the resource assignment comprises a sounding reference signal radio network temporary identifier (SRS-RNTI), wherein the SRS-RNTI triggers a plurality of A-SRS transmissions in a plurality of UL resources of the A-SRS configuration. ### Claim 30 (depends on 25) The network device of claim 25, wherein a DL carrier of the CA configuration and one of the one or more CCs of the A-SRS configuration share frequency resources.