# US 2013/0155973 A1 · Multi-hypothesis channel quality indicator feedback > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155973 A1 - Document ID: US20130155973A1 - Status: Published application - Kind: A1 - Application number: 13/710,803 - Filed: 2012-12-11 - Published: 2013-06-20 - Earliest claimed: 2011-12-14 - Assignees: QUALCOMM Incorporated - Inventors: Stefan Geirhofer; Peter Gaal; Tingfang Ji; Alan Barbieri - Web page: https://patentgrep.com/patent/US20130155973A1 ## CPC - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0452: Multi-user MIMO systems - H04W 72/542: using measured or perceived quality - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for providing multi-hypothesis channel quality indicator (MH-CQI) feedback is described. Hypotheses corresponding to rank indicator (RI) and precoding matrix indicator (PMI) assumptions associated with a dominant interferer are selected. Multi-hypothesis channel quality indicator (MH-CQI) values based on the selected hypotheses are generated. The multi-hypothesis channel quality indicator (MH-CQI) values are encoded. The multi-hypothesis channel quality indicator (MH-CQI) values are sent as feedback. ## Claims ### Claim 1 A method for providing multi-hypothesis channel quality indicator feedback, comprising: selecting hypotheses corresponding to rank indicator and precoding matrix indicator assumptions associated with a dominant interferer; generating multi-hypothesis channel quality indicator values based on the selected hypotheses; encoding the multi-hypothesis channel quality indicator values; and sending the multi-hypothesis channel quality indicator values as feedback. ### Claim 2 (depends on 1) The method of claim 1, wherein the method is performed by a wireless communication device. ### Claim 3 (depends on 1) The method of claim 1, wherein the multi-hypothesis channel quality indicator values are sent to one or more base stations. ### Claim 4 (depends on 1) The method of claim 1, wherein encoding the multi-hypothesis channel quality indicator values uses wideband encoding. ### Claim 5 (depends on 4) The method of claim 4, wherein the multi-hypothesis channel quality indicator values are computed as wideband offsets to conventional channel quality indicator values. ### Claim 6 (depends on 1) The method of claim 1, wherein the selected hypotheses are based on a combination of semi-static and dynamic signaling received. ### Claim 7 (depends on 1) The method of claim 1, wherein the selected hypotheses comprise an additional rank-1 constrained precoding matrix indicator whenever the selected rank indicator is greater than 1. ### Claim 8 (depends on 1) The method of claim 1, wherein the selected hypotheses comprise all rank-1 precoding matrix indicators of a dominant interferer. ### Claim 9 (depends on 1) The method of claim 1, wherein the selected hypotheses are based in part on a serving rank indicator and a precoding matrix indicator selected as part of a conventional serving precoding matrix indicator. ### Claim 10 (depends on 1) The method of claim 1, wherein the selected hypotheses comprise nulling hypotheses from the dominant interferer, wherein the nulling hypotheses are considered separately. ### Claim 11 (depends on 10) The method of claim 10, wherein the selected hypotheses are based on a table, wherein the table provides a mapping to the precoding matrix indicator. ### Claim 12 (depends on 1) The method of claim 1, further comprising: determining the dominant interferer; and sending a signal indicating the dominant interferer. ### Claim 13 (depends on 1) The method of claim 1, further comprising receiving a signal indicating the dominant interferer. ### Claim 14 (depends on 1) The method of claim 1, wherein multi-hypothesis channel quality indicator feedback is provided only when a coordinated precoding type indicator is enabled. ### Claim 15 A method for receiving multi-hypothesis channel quality indicator feedback, comprising: receiving multi-hypothesis channel quality indicator values; and using the multi-hypothesis channel quality indicator values for improved scheduling. ### Claim 16 (depends on 15) The method of claim 15, wherein the method is performed by a base station. ### Claim 17 (depends on 15) The method of claim 15, wherein the multi-hypothesis channel quality indicator values are received from a wireless communication device. ### Claim 18 (depends on 15) The method of claim 15, wherein the scheduling comprises single-cell multi-user multiple-input and multiple-output scheduling, and wherein the single-cell multi-user multiple-input and multiple-output scheduling comprises at least one of wireless communication device pairing and rate prediction. ### Claim 19 (depends on 15) The method of claim 15, wherein the scheduling comprises scheduling within a coordinated multipoint cluster. ### Claim 20 (depends on 15) The method of claim 15, further comprising sending a signal to a wireless communication device indicating whether to compute and report multi-hypothesis channel quality indicator values, wherein the signal comprises a coordinated precoding type indicator. ### Claim 21 (depends on 15) The method of claim 15, further comprising signaling a dominant interferer, wherein the signaling comprises a combination of semi-static and dynamic signaling. ### Claim 22 (depends on 15) The method of claim 15, further comprising signaling a set of hypotheses to generate the multi-hypothesis channel quality indicator values, wherein the set of hypotheses is signaled by a combination of semi-static and dynamic signaling. ### Claim 23 (depends on 15) The method of claim 15, further comprising: instructing all wireless communication devices associated with a remote radio head to periodically feedback multi-hypothesis channel quality indicator values; exhausting all possible transmission hypotheses; making a scheduling decision for each transmission hypothesis; computing a cluster-wide utility metric as a sum of fairness utility metrics associated with individual coordinating transmission points; selecting the transmission hypothesis that corresponds to a maximum cluster-wide utility metric; and finalizing the scheduling decisions of all cells in the cluster associated with the selected transmission hypothesis. ### Claim 24 (depends on 23) The method of claim 23, wherein making a scheduling decision for each transmission hypothesis comprises: selecting a channel quality indicator according to a macro transmission hypothesis; running a single-cell scheduling algorithm based on one or more fairness constraints; and obtaining a fairness utility metric for each remote radio head. ### Claim 25 (depends on 23) The method of claim 23, wherein the maximum cluster-wide utility metric is based on the channel state information of wireless communication devices associated with different cells. ### Claim 26 (depends on 25) The method of claim 25, wherein the channel state information is based on the multi-hypothesis channel quality indicator values, and wherein the wireless communication devices used multiple hypotheses to compute the multi-hypothesis channel quality indicator values. ### Claim 27 (depends on 23) The method of claim 23, wherein muting and codebook-based precoded transmissions are used for all beams in a codebook. ### Claim 28 (depends on 23) The method of claim 23, wherein wireless communication devices compatible with the selected transmission hypothesis are scheduled. ### Claim 29 (depends on 23) The method of claim 23, wherein low power node scheduling decisions are based on the selected transmission hypothesis. ### Claim 30 (depends on 23) The method of claim 23, wherein a pending retransmission uses the selected transmission hypothesis without optimization. ### Claim 31 An apparatus for providing multi-hypothesis channel quality indicator feedback, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to: select hypotheses corresponding to rank indicator and precoding matrix indicator assumptions associated with a dominant interferer; generate multi-hypothesis channel quality indicator values based on the selected hypotheses; encode the multi-hypothesis channel quality indicator values; and send the multi-hypothesis channel quality indicator values as feedback. ### Claim 32 (depends on 31) The apparatus of claim 31, wherein encoding the multi-hypothesis channel quality indicator values uses wideband encoding. ### Claim 33 (depends on 32) The apparatus of claim 32, wherein the multi-hypothesis channel quality indicator values are computed as wideband offsets to conventional channel quality indicator values. ### Claim 34 (depends on 31) The apparatus of claim 31, wherein the selected hypotheses are based on a combination of semi-static and dynamic signaling received. ### Claim 35 (depends on 31) The apparatus of claim 31, wherein the selected hypotheses comprise an additional rank-1 constrained precoding matrix indicator whenever the selected rank indicator is greater than 1. ### Claim 36 (depends on 31) The apparatus of claim 31, wherein the selected hypotheses comprise all rank-1 precoding matrix indicators of a dominant interferer. ### Claim 37 (depends on 31) The apparatus of claim 31, wherein the selected hypotheses are based on a serving rank indicator and a precoding matrix indicator selected as part of a conventional serving precoding matrix indicator. ### Claim 38 (depends on 31) The apparatus of claim 31, wherein multi-hypothesis channel quality indicator feedback is provided only when a coordinated precoding type indicator is enabled. ### Claim 39 An apparatus for receiving multi-hypothesis channel quality indicator feedback, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to: receive multi-hypothesis channel quality indicator values; and use the multi-hypothesis channel quality indicator values for improved scheduling. ### Claim 40 (depends on 39) The apparatus of claim 39, wherein the scheduling comprises single-cell multi-user multiple-input and multiple-output scheduling, and wherein the single-cell multi-user multiple-input and multiple-output scheduling comprises at least one of wireless communication device pairing and rate prediction. ### Claim 41 (depends on 39) The apparatus of claim 39, wherein the scheduling comprises scheduling within a coordinated multipoint cluster. ### Claim 42 (depends on 39) The apparatus of claim 39, further comprising instructions executable to send a signal to a wireless communication device indicating whether to compute and report multi-hypothesis channel quality indicator values, wherein the signal comprises a coordinated precoding type indicator. ### Claim 43 (depends on 39) The apparatus of claim 39, further comprising instructions executable to signal a dominant interferer, wherein the signaling comprises a combination of semi-static and dynamic signaling. ### Claim 44 (depends on 39) The apparatus of claim 39, further comprising instructions executable to signal a set of hypotheses to generate the multi-hypothesis channel quality indicator values, wherein the set of hypotheses is signaled by a combination of semi-static and dynamic signaling. ### Claim 45 (depends on 39) The apparatus of claim 39, wherein the instructions are further executable to: instruct all wireless communication devices associated with a remote radio head to periodically feedback multi-hypothesis channel quality indicator values; exhaust all possible transmission hypotheses; make a scheduling decision for each transmission hypothesis; compute a cluster-wide utility metric as a sum of fairness utility metrics associated with individual coordinating transmission points; select the hypothesis that corresponds to a maximum cluster-wide utility metric; and finalize the scheduling decisions of all cells in the cluster associated with the selected hypothesis. ### Claim 46 (depends on 45) The apparatus of claim 45, wherein the instructions executable to make a scheduling decision for each transmission hypothesis are further executable to: select a channel quality indicator according to a macro transmission hypothesis; run a single-cell scheduling algorithm based on one or more fairness constraints for each remote radio head; and obtain a fairness utility metric for each remote radio head. ### Claim 47 A wireless device comprising: means for selecting hypotheses corresponding to rank indicator and precoding matrix indicator assumptions associated with a dominant interferer; means for generating multi-hypothesis channel quality indicator values based on the selected hypotheses; means for encoding the multi-hypothesis channel quality indicator values; and means for sending the multi-hypothesis channel quality indicator values as feedback. ### Claim 48 (depends on 47) The wireless device of claim 47, wherein the means for encoding the multi-hypothesis channel quality indicator values uses wideband encoding. ### Claim 49 (depends on 47) The wireless device of claim 47, wherein the selected hypotheses comprise an additional rank-1 constrained precoding matrix indicator whenever the selected rank indicator is greater than 1. ### Claim 50 A wireless device comprising: means for receiving multi-hypothesis channel quality indicator values; and means for using the multi-hypothesis channel quality indicator values for improved scheduling. ### Claim 51 (depends on 50) The wireless device of claim 50, further comprising: means for instructing all wireless communication devices associated with a remote radio head to periodically feedback multi-hypothesis channel quality indicator values; means for exhausting all possible transmission hypotheses; means for making a scheduling decision for each transmission hypothesis; means for computing a cluster-wide utility metric as a sum of fairness utility metrics associated with individual coordinating transmission points; means for selecting the hypothesis that corresponds to a maximum cluster-wide utility metric; and means for finalizing the scheduling decisions of all cells in the cluster associated with the selected hypothesis. ### Claim 52 A computer-program product for providing multi-hypothesis channel quality indicator feedback, the computer-program product comprising a non-transitory computer-readable medium having instructions thereon, the instructions comprising: code for causing a wireless communication device to select hypotheses corresponding to rank indicator and precoding matrix indicator assumptions associated with a dominant interferer; code for causing the wireless communication device to generate multi-hypothesis channel quality indicator values based on the selected hypotheses; code for causing the wireless communication device to encode the multi-hypothesis channel quality indicator values; and code for causing the wireless communication device to send the multi-hypothesis channel quality indicator values as feedback. ### Claim 53 (depends on 52) The computer-program product of claim 52, wherein the code for causing the wireless communication device to encode the multi-hypothesis channel quality indicator values uses wideband encoding. ### Claim 54 (depends on 52) The computer-program product of claim 52, wherein the selected hypotheses comprise an additional rank-1 constrained precoding matrix indicator whenever the selected rank indicator is greater than 1. ### Claim 55 A computer-program product for receiving multi-hypothesis channel quality indicator feedback, the computer-program product comprising a non-transitory computer-readable medium having instructions thereon, the instructions comprising: code for causing a base station to receive multi-hypothesis channel quality indicator values; and code for causing the base station to use the multi-hypothesis channel quality indicator values for improved scheduling. ### Claim 56 (depends on 55) The wireless device of claim 55, further comprising: code for causing the base station to instruct all wireless communication devices associated with a remote radio head to periodically feedback multi-hypothesis channel quality indicator values; code for causing the base station to exhaust all possible transmission hypotheses; code for causing the base station to make a scheduling decision for each transmission hypothesis; code for causing the base station to compute a cluster-wide utility metric as a sum of fairness utility metrics associated with individual coordinating transmission points; code for causing the base station to select the hypothesis that corresponds to a maximum cluster-wide utility metric; and code for causing the base station to finalize the scheduling decisions of all cells in the cluster associated with the selected hypothesis.