# US 8,787,289 B2 · Aperiodic transmission method and apparatus for sounding reference signal in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,289 B2 - Document ID: US8787289B2 - Status: Granted - Kind: B2 - Application number: 13/509,486 - Filed: 2011-03-07 - Published: 2012-10-18 - Granted: 2014-07-22 - Earliest claimed: 2010-03-05 - Assignees: LG Electronics Inc. - Applicants: Min Seok Noh; Seung Hee Han; Jae Hoon Chung - Inventors: Min Seok Noh; Seung Hee Han; Jae Hoon Chung - Web page: https://patentgrep.com/patent/US8787289B2 ## CPC - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0023: {Time-frequency-space} - 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 25/0224: {using sounding signals} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 48/12: using downlink control channel - H04W 72/00: Local resource management - H04W 72/12: Wireless traffic scheduling - 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 Provided are a method and an apparatus for an aperiodic transmission of a sounding reference signal (SRS), which is performed by a user equipment (UE), in a wireless communication system. The UE aperiodically transmits an SRS through a certain uplink (UL) component carrier (CC) of a plurality of UL CCs. The certain UL CC is identical to the UL CC that transmits a physical uplink shared channel (PUSCH), which is scheduled by an uplink grant, wherein the uplink grant contains a message that triggers the aperiodic transmission of an SRS. ## Claims ### Claim 1 A method of transmitting an aperiodic sounding reference signal (SRS) by a user equipment (UE) in a wireless communication system, the method comprising: receiving, via a physical downlink control channel (PDCCH), downlink control information (DCI) including at least a trigger for triggering the aperiodic SRS transmission; and upon detecting the trigger, aperiodically transmitting a SRS through a specific uplink (UL) component carrier (CC) among a plurality of aggregated UL CCs when a carrier indicator field (CIF) is also included in the DCI, wherein the specific UL CC is an UL CC identified by the CIF. ### Claim 2 (depends on 1) The method of claim 1, wherein the specific UL CC is an UL CC linked to a downlink (DL) CC in which the PDCCH is allocated. ### Claim 3 (depends on 2) The method of claim 2, wherein a link between the DL CC and the UL CC is determined based on system information. ### Claim 4 (depends on 1) The method of claim 1, wherein the step of aperiodically transmitting the SRS comprises: allocating the SRS to a resource used for periodic SRS transmission in the specific UL CC. ### Claim 5 (depends on 1) The method of claim 1, wherein the step of aperiodically transmitting the SRS comprises: allocating the SRS to an available whole SRS bandwidth among respective system bandwidths in the specific UL CC. ### Claim 6 (depends on 1) The method of claim 1, wherein the step of aperiodically transmitting the SRS comprises: allocating the SRS to a greatest bandwidth among SRS bandwidths determined in a UE-specific manner in the specific UL CC. ### Claim 7 (depends on 1) The method of claim 1, wherein the step of aperiodically transmitting the SRS comprises: allocating the SRS to a subset of SRS bandwidths determined in a UE-specific manner in the specific UL CC. ### Claim 8 (depends on 1) The method of claim 1, wherein the step of aperiodically transmitting the SRS comprises: aperiodically transmitting the SRS through a plurality of antennas. ### Claim 9 (depends on 1) The method of claim 1, when the carrier indicator field (CIF) is not included in the DCI, aperiodically transmitting the SRS through an uplink UL CC in which a physical uplink shared channel (PUSCH) is scheduled by the PDCCH. ### Claim 10 A user equipment configured to transmit an aperiodic sounding reference signal (SRS) in a wireless communication system, the user equipment comprising: a radio frequency (RF) transmitter; and a processor coupled to the RF transmitter and configured to receiving, via a physical downlink control channel (PDCCH), downlink control information (DCI) including at least a trigger for triggering the aperiodic SRS transmission, and upon detecting the trigger, aperiodically transmit a SRS through a specific uplink (UL) component carrier (CC) among a plurality of aggregated UL CCs when a carrier indicator field (CIF) is also included in the DCI, wherein the specific UL CC is an UL CC identified by the CIF. ### Claim 11 (depends on 10) The user equipment of claim 10, wherein the specific UL CC is an UL CC linked to a downlink (DL) CC in which the PDCCH is allocated. ### Claim 12 (depends on 11) The user equipment of claim 11, wherein a link between the DL CC and the UL CC is determined based on system information. ### Claim 13 (depends on 10) The user equipment of claim 10, wherein, when the carrier indicator field (CIF) is not included in the DCI, the processor is configured to aperiodically transmit the SRS through an uplink UL CC in which a physical uplink shared channel (PUSCH) is scheduled by the PDCCH.