# US 12,010,067 B2 · Slot-based CSI report configuration for dynamic TDD > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,067 B2 - Document ID: US12010067B2 - Status: Granted - Kind: B2 - Application number: 17/263,351 - Filed: 2018-08-10 - Published: 2021-10-21 - Granted: 2024-06-11 - Earliest claimed: 2018-08-10 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Sara Sandberg; Sebastian Faxér; Shiwei Gao; Arne Simonsson - Web page: https://patentgrep.com/patent/US12010067B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04L 5/0057: {Physical resource allocation for CQI} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04L 5/1469: {using time-sharing} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04L 5/0023: {Time-frequency-space} - 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 5/0092: {Indication of how the channel is divided} - 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 A method for operating a cell, performed by a network node. The method includes transmitting a frame comprising a set of slots receiving Channel State Information, CSI, reports at least indicative of interference measured by a user equipment using the set of slots, estimating a transmission direction pattern of an adjacent cell relative a transmission direction pattern of the cell based on the received CSI reports, and transmitting a signal to the user equipment based on the estimated transmission direction pattern of the adjacent cell. ## Claims ### Claim 1 A method for operating a cell, performed by a network node, the method comprising: transmitting a frame comprising a set of slots; receiving Channel State Information, CSI, reports at least indicative of interference measured by a user equipment using the set of slots; estimating a transmission direction pattern of an adjacent cell relative to a transmission direction pattern of the cell based on the received CSI reports; transmitting a signal to the user equipment based on the estimated transmission direction pattern of the adjacent cell; calculating a statistical measure of interference levels, of each slot of the set of slots, using the CSI reports and previously received historical CSI reports; the transmission direction pattern of the adjacent cell estimated using the statistical measure; determining that the statistical measure is stationary; and selecting only one slot out of the corresponding slots having the stationary statistical measure for later CSI reporting instances. ### Claim 2 (depends on 1) The method according to claim 1, wherein all slots configurable for downlink transmission, by the network node, are selected to the set of slots. ### Claim 3 (depends on 2) The method according to claim 2, wherein all slots configurable for one of uplink and downlink transmission, by the network node, are selected to the set of slots. ### Claim 4 (depends on 2) The method according to claim 2, further comprising: sending a Channel State Information, CSI, measurement configuration message indicative of the set of slots to the user equipment. ### Claim 5 (depends on 2) The method according to claim 2, wherein the measurement configuration message is further indicative of: interference measurements in every slot of the set of slots; and channel measurements in a subset of the set of slots. ### Claim 6 (depends on 1, 2) The method according to claim 2, further comprising: selecting an updated set of slots being selected from all slots comprised in the frame; and repeating the steps of claim 1 using the updated set. ### Claim 7 (depends on 1) The method according to claim 1, wherein all slots configurable for one of uplink and downlink transmission, by the network node, are selected to the set of slots. ### Claim 8 (depends on 1) The method according to claim 1, further comprising: sending a Channel State Information, CSI, measurement configuration message indicative of the set of slots to the user equipment. ### Claim 9 (depends on 8) The method according to claim 8, wherein the measurement configuration message is further indicative of: interference measurements in every slot of the set of slots; and channel measurements in a subset of the set of slots. ### Claim 10 (depends on 1) The method according to claim 1, further comprising: selecting an updated set of slots being selected from all slots comprised in the frame; and repeating the steps of claim 1 using the updated set. ### Claim 11 (depends on 10) The method according to claim 10, wherein the updated set is selected only for every Nth frame, wherein the number N is selected as a multiple of a total number of slots in the frame. ### Claim 12 (depends on 11) The method according to claim 11, wherein the number N is selected dependent on a channel measure indicative of how fast a channel between the network node and the user equipment changes. ### Claim 13 (depends on 1) The method according to claim 1, wherein the CSI reports are further indicative of channel quality of one or more slots of the set of slots, wherein the transmitting further comprises: estimating channel quality for the remaining slots comprised in the frame using the one or more transmission direction patterns of one or more adjacent cells and the channel quality of the CSI report; and at least one of scheduling slot transmission and performing slot link adaptation using the channel quality of the CSI report and the estimated channel quality. ### Claim 14 A method performed by a user equipment, the method comprising: receiving a Channel State Information, CSI, measurement configuration message indicative of a set of slots comprised in a frame from a network node; measuring interference using the set of slots; sending a Channel State Information, CSI, report indicative of interference measured using the set of slots; and receiving a signal from the network node, the signal having been transmitted based on an estimated transmission direction pattern of an adjacent cell, and been based on a calculated statistical measure of interference levels, of each slot of the set of slots, using the CSI reports and previously received historical CSI reports, the transmission direction pattern of the adjacent cell having been estimated using the statistical measure, having been determined that the statistical measure is stationary, and having been selected as only one slot out of the corresponding slots, having the stationary statistical measure, for later CSI reporting instances. ### Claim 15 (depends on 14) The method according to claim 14, wherein the measurement configuration message is further indicative of interference measurements to be performed in every slot of the set of slots, and, channel measurements to be performed in a subset of the set of slots; and wherein interference is measured in every slot of the set of slots and the channel is measured in a subset of the set of slots. ### Claim 16 A network node comprising: processing circuitry configured to: transmit a frame comprising a set of slots; receive Channel State Information, CSI, reports at least indicative of interference measured by a user equipment using the set of slots; estimate a transmission direction pattern of an adjacent cell relative a transmission direction pattern of the cell based on the received CSI reports; transmit a signal to the user equipment based on the estimated transmission direction pattern of the adjacent cell; calculate a statistical measure of interference levels, of each slot of the set of slots, using the CSI reports and previously received historical CSI reports; the transmission direction pattern of the adjacent cell estimated using the statistical measure; determine that the statistical measure is stationary; and select only one slot out of the corresponding slots, having the stationary statistical measure, for later CSI reporting instances. ### Claim 17 A user equipment comprising: processing circuitry configured to: receive a Channel State Information, CSI, measurement configuration message indicative of a set of slots comprised in a frame from a network node; measure interference using the set of slots; send a Channel State Information, CSI, report indicative of interference measured using the set of slots; and receive a signal from the network node, the signal being configured to have been transmitted based on an estimated transmission direction pattern of an adjacent cell, using the CSI reports and previously received historical CSI reports, the transmission direction pattern of the adjacent cell estimated using the statistical measure, and having been determines that the statistical measure is stationary, and having been selected as only one slot out of the corresponding slots, having the stationary statistical measure, for later CSI reporting instances.