# US 9,520,933 B2 · Method and apparatus for enabling multiple transmission modes based on multiple search spaces > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,933 B2 - Document ID: US9520933B2 - Status: Granted - Kind: B2 - Application number: 12/685,189 - Filed: 2010-01-11 - Published: 2010-07-15 - Granted: 2016-12-13 - Earliest claimed: 2009-01-12 - Assignees: QUALCOMM Incorporated - Applicants: Tao Luo; Wanshi Chen; Juan Montojo - Inventors: Tao Luo; Wanshi Chen; Juan Montojo - Web page: https://patentgrep.com/patent/US9520933B2 ## CPC - H04B 7/0689: {using different transmission schemes, at least one of them being a diversity transmission scheme} - H04B 17/24: with feedback of measurements to the transmitter - H04B: TRANSMISSION ## Abstract Certain aspects of the present disclosure relate to a technique for enabling multiple transmission modes based on control information of different formats. ## Claims ### Claim 1 A method for wireless communications, comprising: monitoring a plurality of search spaces; receiving control information in one of the search spaces; and transmitting data using a transmission scheme selected based on the search space in which the control information was received. ### Claim 2 (depends on 1) The method of claim 1, wherein the transmission scheme selected comprises at least one of: beamforming and transmit diversity. ### Claim 3 (depends on 1) The method of claim 1, wherein transmitting data further comprising: transmitting data using a beamforming transmission scheme based on the determination that the control information was received in a user-equipment-specific search space. ### Claim 4 (depends on 1) The method of claim 1, wherein transmitting data further comprising: transmitting data using a transmit diversity transmission scheme based on the determination that the control information was received in a common search space. ### Claim 5 (depends on 1) The method of claim 1, wherein the control information comprises downlink control information (DCI) having DCI format 1A. ### Claim 6 (depends on 1) The method of claim 1, wherein the plurality of search spaces comprises common search space and user-equipment-specific search space. ### Claim 7 An apparatus for wireless communications, comprising: a monitoring circuit configured to monitor a plurality of search spaces; a receiver configured to receive control information in one of the search spaces; and a transmitter configured to transmit data using a transmission scheme selected based on the search space in which the control information was received. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the transmission scheme selected comprises at least one of: beamforming and transmit diversity. ### Claim 9 (depends on 7) The apparatus of claim 7, wherein the transmitter is also configured to transmit data using a beamforming transmission scheme based on the determination that the control information was received in a user-equipment-specific search space. ### Claim 10 (depends on 7) The apparatus of claim 7, wherein the transmitter is also configured to transmit data using a transmit diversity transmission scheme based on the determination that the control information was received in a common search space. ### Claim 11 (depends on 7) The apparatus of claim 7, wherein the control information comprises downlink control information (DCI) having DCI format 1A. ### Claim 12 (depends on 7) The apparatus of claim 7, wherein the plurality of search spaces comprises common search space and user-equipment-specific search space. ### Claim 13 An apparatus for wireless communications, comprising: means for monitoring a plurality of search spaces; means for receiving control information in one of the search spaces; and means for transmitting data using a transmission scheme selected based on the search space in which the control information was received. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the transmission scheme selected comprises at least one of: beamforming and transmit diversity. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein the means for transmitting is further configured to transmit data using a beamforming transmission scheme based on the determination that the control information was received in a user-equipment-specific search space. ### Claim 16 (depends on 13) The apparatus of claim 13, wherein the means for transmitting is further configured to transmit data using a transmit diversity transmission scheme based on the determination that the control information was received in a common search space. ### Claim 17 (depends on 13) The apparatus of claim 13, wherein the control information comprises downlink control information (DCI) having DCI format 1A. ### Claim 18 (depends on 13) The apparatus of claim 13, wherein the plurality of search spaces comprises common search space and user-equipment-specific search space. ### Claim 19 A computer-program product for wireless communications, comprising a computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising: instructions for monitoring a plurality of search spaces; instructions for receiving control information in one of the search spaces; and instructions for transmitting data using a transmission scheme selected based on the search space in which the control information was received. ### Claim 20 (depends on 19) The computer-program product of claim 19, wherein the transmission scheme selected comprises at least one of: beamforming and transmit diversity. ### Claim 21 (depends on 19) The computer-program product of claim 19, wherein the instructions further comprise: instructions for transmitting data using a beamforming transmission scheme based on the determination that the control information was received in a user-equipment-specific search space. ### Claim 22 (depends on 19) The computer-program product of claim 19, wherein the instructions further comprise: instructions for transmitting data using a transmit diversity transmission scheme based on the determination that the control information was received in a common search space. ### Claim 23 (depends on 19) The computer-program product of claim 19, wherein the control information comprises downlink control information (DCI) having DCI format 1A. ### Claim 24 (depends on 19) The computer-program product of claim 19, wherein the plurality of search spaces comprises common search space and user-equipment-specific search space. ### Claim 25 An apparatus for wireless communications, comprising: at least one processor configured to monitor a plurality of search spaces, receive control information in one of the search spaces, and transmit data using a transmission scheme selected based on the search space in which the control information was received; and a memory coupled to the at least one processor. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the transmission scheme selected comprises at least one of: beamforming and transmit diversity. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein the processor is further configured to transmit data using a beamforming transmission scheme based on the determination that the control information was received in a user-equipment-specific search space. ### Claim 28 (depends on 25) The apparatus of claim 25, wherein the processor is further configured to transmit data using a transmit diversity transmission scheme based on the determination that the control information was received in a common search space. ### Claim 29 (depends on 25) The apparatus of claim 25, wherein the control information comprises downlink control information (DCI) having DCI format 1A. ### Claim 30 (depends on 25) The apparatus of claim 25, wherein the plurality of search spaces comprises common search space and user-equipment-specific search space.