# US 10,320,451 B2 · Downlink channel parameters determination for a multiple-input-multiple-output (MIMO) system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,320,451 B2 - Document ID: US10320451B2 - Status: Granted - Kind: B2 - Application number: 15/169,247 - Filed: 2016-05-31 - Published: 2016-09-22 - Granted: 2019-06-11 - Earliest claimed: 2006-03-20 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Qinghua Li; Xintian E. Lin; Guangjie Li; Kuilin Clark Chen; Xiaoyun May Wu - Web page: https://patentgrep.com/patent/US10320451B2 ## CPC - H04B 7/0413: MIMO systems - H04B 7/0417: Feedback systems - H04B 7/043: {using best eigenmode, e.g. beam forming or beam steering} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 17/24: with feedback of measurements to the transmitter - H04B 17/26: using historical data, averaging values or statistics - H04B 17/309: Measuring or estimating channel quality parameters - H04L 5/0058: {Allocation criteria} - H04W 72/1273: of downlink data flows - H04B 7/0634: {Antenna weights or vector/matrix coefficients} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a multiple-input-multiple-output (MIMO) system are generally described herein. Other embodiments may be described and claimed. ## Claims ### Claim 1 An evolved NodeB (eNB) comprising: an antenna; and a processor coupled with the antenna, the processor to: process uplink channel quality information that is based at least in part on channel quality of uplink spatial channels or data streams; facilitate transmission, on one or more downlink channels of a number of downlink channels, of a downlink signal to a subscriber station using downlink parameters that are determined based on the uplink channel quality information; and identify, based on an uplink message received from a subscriber station, feedback information corresponding to the downlink signal, wherein the feedback information is only for a subset of channels of the number of downlink channels, and wherein the number of the subset of channels is less than the number of downlink channels. ### Claim 2 (depends on 1) The eNB of claim 1, wherein the subset of channels is a subset of relatively stronger channels of the number of downlink channels. ### Claim 3 (depends on 1) The eNB of claim 1, wherein the uplink channel quality information includes a mean or a variance of channel quality for each of the spatial channels or data streams. ### Claim 4 (depends on 1) The eNB of claim 1, wherein the uplink channel quality information includes an estimated signal to noise plus interference ratio (SINR). ### Claim 5 (depends on 1) The eNB of claim 1, wherein the determined downlink parameters include a number of data streams, a modulation/coding scheme, bit loading, or power loading for the data streams. ### Claim 6 (depends on 1) The eNB of claim 1, wherein the feedback information includes a beamforming matrix or signal to noise plus interference ratio (SINR). ### Claim 7 (depends on 1) The eNB of claim 1, wherein the processor is further to facilitate transmission of an instruction to the subscriber station to feed back the information only for the subset of channels. ### Claim 8 An apparatus to be employed in a base station, the apparatus comprising: a receiver to collect uplink channel quality information of one or more uplink channels of a multiple-input-multiple-output (MIMO) system employed by the base station hosting the apparatus to communicate with a subscriber station, wherein the uplink channel quality information is based at least in part on channel quality of uplink spatial channels or data streams; and a computation block coupled to the receiver to compute, based at least in part on the uplink channel quality information, downlink channel parameters that include a number of downlink channels usable to transmit signals from the base station and a modulation and coding scheme for use by the base station to communicate with the subscriber station via one or more downlink channels of the number of downlink channels; wherein the receiver is further to receive an uplink message from the subscriber station that is to include feedback information only for a subset of downlink channels of the number of downlink channels usable to transmit signals from the base station. ### Claim 9 (depends on 8) The apparatus of claim 8, further comprising a transmitter coupled to the computation block, the transmitter to communicate with the subscriber station via the one or more downlink channels based on the downlink channel parameters. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the transmitter and the receiver are part of a transceiver having at least one common component, and the apparatus is a chipset. ### Claim 11 (depends on 8) The apparatus of claim 8, wherein the downlink channel parameters further comprise a number of downlink data streams, loading, or power loading for the number of downlink data streams. ### Claim 12 (depends on 8) The apparatus of claim 8, wherein the computation block is to calculate at least one of a mean or a variance of channel quality for each uplink spatial channel or data stream collected. ### Claim 13 (depends on 8) The apparatus of claim 8, wherein the fed back information comprises at least one of a beamforming matrix or signal to noise plus interference ratio (SINR).