# US 8,542,647 B2 · Method and apparatus for transmitting sounding reference signal in radio communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,647 B2 - Document ID: US8542647B2 - Status: Granted - Kind: B2 - Application number: 13/320,707 - Filed: 2010-05-17 - Published: 2012-03-22 - Granted: 2013-09-24 - Earliest claimed: 2009-05-15 - Assignees: LG Electronics Inc. - Applicants: Min Seok Noh; Sung Ho Moon; Jae Hoon Chung; Seung Hee Han; Yeong Hyeon Kwon - Inventors: Min Seok Noh; Sung Ho Moon; Jae Hoon Chung; Seung Hee Han; Yeong Hyeon Kwon - Web page: https://patentgrep.com/patent/US8542647B2 ## CPC - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - 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: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Disclosed is a method for transmitting a sounding reference signal from a terminal to a base station in a radio communication system. More specifically, the method comprises the steps of: receiving downlink control information from a base station; checking a flag bit included in said downlink control information; checking an interpretation bit is included in said downlink control information, when said flag bit indicates an uplink; and transmitting an additional sounding reference signal and/or an uplink common channel based on said interpretation bit. ## Claims ### Claim 1 A method for transmitting sounding reference signals by a user equipment in a radio communication system, comprising: receiving downlink control information from a base station; checking a flag bit included in the downlink control information; checking an interpretation bit included in the downlink control information if the flag bit indicates uplink; and performing at least one of transmission of an additional sounding reference signal or transmission of an uplink shared channel based on the interpretation bit. ### Claim 2 (depends on 1) The method according to claim 1, wherein the downlink control information is a format 0 or format 1a. ### Claim 3 (depends on 1) The method according to claim 1, further comprising performing reception of a downlink shared channel if the flag bit indicates downlink. ### Claim 4 (depends on 1) The method according to claim 1, wherein the size of the interpretation bit is 1 bit or 2 bits. ### Claim 5 (depends on 1) The method according to claim 1, wherein the transmission of the uplink shared channel and the reception of the downlink shared channel are performed via a single antenna. ### Claim 6 A method for transmitting sounding reference signals by a user equipment in a radio communication system, comprising: receiving downlink control information defined in a legacy system along with downlink control information for uplink multiple input multiple output (MIMO) transmission from a base station; performing transmission of an uplink shared channel in an uplink MIMO mode; checking a flag bit included in the downlink control information defined in the legacy system; checking an interpretation bit included in the downlink control information defined in the legacy system if the flag bit indicates uplink; and performing transmission of an additional sounding reference signal based on the interpretation bit. ### Claim 7 (depends on 6) The method according to claim 6, further comprising performing reception of a downlink shared channel using a single antenna if the flag bit indicates downlink. ### Claim 8 A user equipment in a radio communication system, comprising: a reception module configured to receive downlink control information from a base station; a processor configured to check a flag bit included in the downlink control information and to check an interpretation bit included in the downlink control information if the flag bit indicates uplink; and a transmission module configured to perform at least one of transmission of an additional sounding reference signal or transmission of an uplink shared channel based on the interpretation bit. ### Claim 9 (depends on 8) The user equipment according to claim 8, wherein the downlink control information is a format 0 or format 1a. ### Claim 10 (depends on 8) The user equipment according to claim 8, wherein the reception module performs reception of a downlink shared channel if the flag bit indicates downlink. ### Claim 11 (depends on 8) The user equipment according to claim 8, wherein the size of the interpretation bit is 1 bit or 2 bits. ### Claim 12 (depends on 8) The user equipment according to claim 8, wherein the transmission of the uplink shared channel and the reception of the downlink shared channel are performed via a single antenna. ### Claim 13 A user equipment in a radio communication system, comprising: a reception module configured to receive downlink control information defined in a legacy system along with downlink control information for uplink multiple input multiple output (MIMO) transmission from a base station; a transmission module configured to perform transmission of an uplink shared channel in an uplink MIMO mode; and a processor configured to check a flag bit included in the downlink control information defined in the legacy system and to check an interpretation bit included in the downlink control information defined in the legacy system if the flag bit indicates uplink, wherein the transmission module performs transmission of an additional sounding reference signal based on the interpretation bit. ### Claim 14 (depends on 13) The user equipment according to claim 13, wherein the reception module performs reception of a downlink shared channel using a single antenna if the flag bit indicates downlink.