# US 9,882,624 B2 · Systems and methods for communication of channel state information > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,624 B2 - Document ID: US9882624B2 - Status: Granted - Kind: B2 - Application number: 13/247,062 - Filed: 2011-09-28 - Published: 2012-10-11 - Granted: 2018-01-30 - Earliest claimed: 2010-09-29 - Assignees: QUALCOMM Incorporated - Applicants: Santosh Paul Abraham; Simone Merlin; Sameer Vermani; Hemanth Sampath - Inventors: Santosh Paul Abraham; Simone Merlin; Sameer Vermani; Hemanth Sampath - Web page: https://patentgrep.com/patent/US9882624B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/0028: {Formatting} - H04L 1/0039: {other detection of signalling, e.g. detection of TFCI explicit signalling (H04L1/0046, H04L27/0012 and H04L25/0262 take precedence)} - H04L 1/0079: {Formats for control data (H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00)} - H04L 5/0057: {Physical resource allocation for CQI} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04B 7/0641: {Differential feedback} - H04B 7/0643: {Feedback on request} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/1607: Details of the supervisory signal - H04L 5/0023: {Time-frequency-space} - H04L 25/0204: {of multiple channels} - H04L 25/021: {Estimation of channel covariance} - H04L 25/0248: {Eigen-space methods} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system. ## Claims ### Claim 1 An apparatus for wireless communication, comprising: a receiver configured to receive a message indicating that channel state information is requested; a processing system configured to generate a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “0” and the bits of the second field have a value of “111” if the communication does not include channel state information; and a transmitter configured to transmit the communication. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the bit has a value of “1” if a first segment of channel state information is included in the communication. ### Claim 3 An apparatus for wireless communication, comprising: a receiver configured to receive a message indicating that channel state information is requested; a processing system configured to generate a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the first field and the second field indicate null channel state information is included in the communication; and a transmitter configured to transmit the communication. ### Claim 4 (depends on 3) The apparatus of claim 3, further comprising: at least one antenna, wherein the receiver is configured to receive the message via the at least one antenna, wherein the apparatus is configured as an access terminal. ### Claim 5 An apparatus for wireless communication, comprising: a receiver configured to receive a message indicating that channel state information is requested; a processing system configured to generate a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the first field and the second field indicate null channel state information is included in the communication if the first field indicates that a first segment of channel state information is not included in the communication and a value of the second field is at least as great as a maximum number of remaining segments; and a transmitter configured to transmit the configuration. ### Claim 6 (depends on 5) The apparatus of claim 5, further comprising: at least one antenna, wherein the receiver is configured to receive the message via the at least one antenna, wherein the apparatus is configured as an access terminal. ### Claim 7 An apparatus for wireless communication, comprising: a receiver configured to receive a message indicating that channel state information is requested; a processing system configured to generate a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the second field signifies a number of segments of channel state information remaining to be transmitted if the first field indicates that a first segment of channel state information is included or a value of the second field is less than a maximum number of remaining segments; and a transmitter configured to transmit the configuration. ### Claim 8 (depends on 7) The apparatus of claim 7, further comprising: at least one antenna, wherein the receiver is configured to receive the message via the at least one antenna, wherein the apparatus is configured as an access terminal. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the communication comprises the channel state information, and wherein the communication further comprises an indicator signifying whether the channel state information was calculated for single user or multi-user. ### Claim 10 A method of wireless communication, comprising: receiving a message indicating that channel state information is requested; generating a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “0” and the bits of the second field have a value of “111” if the communication does not include channel state information; and transmitting the communication. ### Claim 11 (depends on 10) The method of claim 10, wherein the bit has a value of “1” if a first segment of channel state information is included in the communication. ### Claim 12 A method of wireless communication, comprising: receiving a message indicating that channel state information is requested; generating a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the first field and the second field indicate null channel state information is included in the communication; and transmitting the communication. ### Claim 13 A method of wireless communication, comprising: receiving a message indicating that channel state information is requested; generating a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the first field and the second field indicate null channel state information is included in the communication if the first field indicates that a first segment of channel state information is not included in the communication and a value of the second field is at least as great as a maximum number of remaining segments; and transmitting the communication. ### Claim 14 A method of wireless communication, comprising: receiving a message indicating that channel state information is requested; generating a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the second field signifies a number of segments of channel state information remaining to be transmitted if the first field indicates that a first segment of channel state information is included or a value of the second field is less than a maximum number of remaining segments; and transmitting the communication. ### Claim 15 (depends on 10) The method of claim 10, wherein the communication comprises the channel state information, and wherein the communication further comprises an indicator signifying whether the channel state information was calculated for single user or multi-user. ### Claim 16 An apparatus for wireless communication, comprising: means for receiving a message indicating that channel state information is requested; means for generating a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “0” and the bits of the second field have a value of “111” if the communication does not include channel state information; and means for transmitting the communication. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the bit has a value of “1” if a first segment of channel state information is included in the communication. ### Claim 18 (depends on 16) The apparatus of claim 16, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be transmitted, and wherein the field and the second field indicate null channel state information is included in the communication. ### Claim 19 (depends on 16) The apparatus of claim 16, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be transmitted, and wherein the field and the second field indicate null channel state information is included in the communication if the field indicates that a first segment of channel state information is not included in the communication and a value of the second field is at least as great as a maximum number of remaining segments. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be transmitted, and wherein the second field signifies a number of segments of channel state information remaining to be transmitted if the field indicates that a first segment of channel state information is included or a value of the second field is less than a maximum number of remaining segments. ### Claim 21 (depends on 16) The apparatus of claim 16, wherein the communication comprises the channel state information, and wherein the communication further comprises an indicator signifying whether the channel state information was calculated for single user or multi-user. ### Claim 22 An access terminal, comprising: at least one antenna; a receiver configured to receive, via the at least one antenna, a message indicating that channel state information is requested; a processing system configured to generate a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “0” and the bits of the second field have a value of “111” if the communication does not include channel state information; and a transmitter configured to transmit the communication.