# US 9,883,527 B2 · Using an uplink grant as trigger of first or second type of CQI report > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,527 B2 - Document ID: US9883527B2 - Status: Granted - Kind: B2 - Application number: 15/354,103 - Filed: 2016-11-17 - Published: 2017-03-09 - Granted: 2018-01-30 - Earliest claimed: 2007-03-19 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Eva Englund; Pål Frenger; Stefan Parkvall - Web page: https://patentgrep.com/patent/US9883527B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof} - H04L 1/0028: {Formatting} - H04L 1/0029: {Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling (power control H04W52/04)} - H04L 1/003: {Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits} - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 56/001: {Synchronization between nodes} - H04W 72/542: using measured or perceived quality - H04L 5/0057: {Physical resource allocation for CQI} - H04W 24/00: Supervisory, monitoring or testing arrangements - H04W 88/02: Terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Channel state feedback is provided from a UE to a base station as a first, detailed or a second, less detailed type of channel state feedback information. Initially it is determined whether the UE has received an uplink grant from the base station or not. If the UE has received an uplink grant, a first type of channel state feedback information is transmitted to the base station on the granted resource. If, however, the UE has not received an uplink grant, a second type of channel state feedback information is transmitted to the base station. Different types of channel state feedback information enables a UE and an associated base station to use available resources more efficiently, when requesting for and delivering channel state feedback information. ## Claims ### Claim 1 A method in a user equipment, UE, providing channel state feedback from the UE to a base station, comprising the steps of: determining whether the UE has received an uplink grant from the base station or not; transmitting a first type of channel state feedback information to the base station on a granted resource upon determining that the UE has received an uplink grant; transmitting a second type of channel state feedback information on a dedicated resource upon determining that the UE has not received an uplink grant, wherein said second type of channel state feedback information is transmitted in a format comprising fewer bits than a format of the first type. ### Claim 2 (depends on 1) The method according to claim 1, further comprising the step of determining whether channel state feedback trigger criteria specified for said UE is valid and wherein the respective channel state feedback information is transmitted only if said channel state feedback trigger criteria is valid. ### Claim 3 (depends on 1) The method according to claim 1, wherein if the UE has no uplink grant the second, less detailed type of channel state feedback information is periodically transmitted while the more detailed first type of channel state feedback information is periodically transmitted if the UE does have an uplink grant. ### Claim 4 (depends on 1) The method according to claim 1, further comprising the step of determining whether the UE has uplink data, and when the UE has uplink data and an uplink grant, a scheduled uplink transmission comprises both channel state feedback information and uplink data. ### Claim 5 (depends on 1) The method according to claim 1, further comprising the step of determining whether the UE has uplink data, and when the UE has an uplink grant but no uplink data, a scheduled uplink transmission comprises only channel state feedback information. ### Claim 6 (depends on 5) The method according to claim 5, wherein said scheduled uplink transmission is utilized as a signaling of an empty buffer status information to the base station. ### Claim 7 (depends on 5) The method according to claim 5, wherein said scheduled uplink transmission is utilized as an acknowledgement of the uplink grant that was transmitted in the downlink. ### Claim 8 (depends on 1) The method according to claim 1, wherein the type of report to be used for transmission of the respective channel state feedback information is dependent on the size of the received uplink grant. ### Claim 9 (depends on 8) The method according to claim 8, further comprising the step of comparing the size of said uplink grant to a threshold, T1, and wherein the channel state feedback information is transmitted in a report of a first type of a size associated with T1 if said uplink grant size exceeds T1. ### Claim 10 (depends on 9) The method according to claim 9, wherein if said size does not exceed T1, said comparison is gradually repeated for one or more thresholds, T2 . . . Tn, wherein T1>T2>Tn and wherein a match results in the transmission of a report of an associated size. ### Claim 11 (depends on 1) The method according to claim 1, wherein the size of the uplink grant is an indication of the bandwidth, the modulation size, and/or the code rate associated with the uplink grant. ### Claim 12 (depends on 1) The method according to claim 1, wherein remaining available energy for data transmission is included on the uplink as a condition for transmission of the channel state feedback information. ### Claim 13 A user equipment, UE, for providing channel state feedback from the UE to a base station, the UE comprising: processing circuitry configured to: determine whether the UE has received an uplink grant from the base station; and transmit a first type of channel state feedback information to the base station on a granted resource upon determining that the UE has received an uplink grant, and a second type of channel state feedback information on a dedicated resource upon determining that the UE has not received an uplink grant, wherein said second type of channel state feedback information is transmitted in a format comprising fewer bits than a format of the first type. ### Claim 14 (depends on 13) The UE according to claim 13, wherein said processing circuitry is further configured to determine whether relevant channel state feedback trigger criteria specified for said UE is valid, and wherein said processing circuitry is further configured to only transmit channel state feedback information if said channel state feedback trigger criteria is valid. ### Claim 15 (depends on 13) The UE according to claim 13, wherein said channel state feedback information is transmitted in a generated report. ### Claim 16 (depends on 15) The UE according to claim 15, wherein said processing unit is further configured to periodically generate a second, less detailed report type when the UE has no uplink grant and a second, more detailed report type when the UE does have an uplink grant. ### Claim 17 (depends on 13) The UE according to claim 13, wherein said processing circuitry is further configured to compare the size of said uplink grant to a threshold, T1, and wherein said processing circuitry is further configured to generate a report associated with T1 if said size exceeds T1. ### Claim 18 (depends on 17) The UE according to claim 17, wherein if said size does not exceed T1, said processing circuitry is further configured to gradually repeat said comparison procedure for one or more thresholds, T2 . . . Tn, wherein T1>T2 . . . >Tn, and wherein said processing circuitry is further configured to transmit a report of an associated size when the associated size exceeds one of the additional thresholds. ### Claim 19 (depends on 13) The UE according to, claim 13, wherein said processing circuitry is further configured to include remaining available energy for data transmission on the uplink as a condition for generating said report. ### Claim 20 A method in a base station having a scheduler for obtaining channel state feedback information from a user equipment, UE, the method comprising the steps of: determining whether channel state feedback information is required; generating an uplink grant when channel state feedback information is required; providing the generated uplink grant to the UE in order to receive the channel state feedback information on a granted resource; receiving a first type of channel state feedback information on the granted resource when the uplink grant has been transmitted to the UE; and receiving a second type of channel state feedback information on a dedicated resource when the uplink grant has not been transmitted to the UE, wherein said second type of channel state feedback information is transmitted in a format comprising fewer bits than a format of the first type. ### Claim 21 (depends on 20) The method according to claim 20, wherein said determining step further comprises determining whether downlink data is present in the base station, and when downlink data is present, generating and providing the uplink grant to the UE in order to receive downlink channel state feedback information on the granted resource. ### Claim 22 (depends on 21) The method according to claim 21, wherein said determining step further comprises determining whether an uplink load is below a threshold, th, and when the uplink load is below said threshold, generating and providing the uplink grant to the UE. ### Claim 23 (depends on 20) The method according to claim 20, wherein an uplink grant is provided to the UE for the purpose of receiving an uplink transmission on the granted resource containing at least channel state feedback information, and wherein the uplink transmission from the UE is used for estimating the uplink channel quality for link adaptation and/or channel dependent scheduling of uplink data from the UE. ### Claim 24 (depends on 20) The method according to claim 20, wherein an uplink grant is provided to the UE for the purpose of maintaining uplink synchronization. ### Claim 25 (depends on 20) The method according to claim 20, wherein the size of the uplink grant is variable. ### Claim 26 A base station having a scheduler for obtaining channel state feedback information from a user equipment, UE, the base station comprising: processing circuitry configured to: determine whether channel state feedback information is required, and generate an uplink grant in order to receive channel state feedback information from the UE on a granted resource upon determining that channel state feedback information is required; transmit the uplink grant to the UE; and receive channel state feedback information, wherein a first type of channel state feedback information is received on the granted resource when the uplink grant has been transmitted to the UE, and wherein a second type of channel state feedback information is received on a dedicated resource when the uplink grant has not been transmitted to the UE, wherein said second type of channel state feedback information is transmitted in a format comprising fewer bits than a format of the first type. ### Claim 27 (depends on 26) The base station according to claim 26, wherein said processing circuitry is further configured to provide an uplink grant to the UE in order to receive downlink channel state feedback required for link adaptation and/or channel dependent scheduling of downlink data to the UE on the granted resource if the base station has downlink data. ### Claim 28 (depends on 27) The base station according to claim 27, wherein said processing circuitry is further configured to provide an uplink grant to the UE when the uplink load is also below a threshold, th, such that uplink data from other UEs will not be negatively affected. ### Claim 29 (depends on 27) The base station according to claim 27, wherein said processing circuitry is further configured to provide an uplink grant to the UE in order to receive an uplink transmission on the granted resource containing at least channel state feedback information, and wherein said processing circuitry is further configured to use the uplink transmission to estimate the uplink channel quality for link adaptation and/or channel dependent scheduling of uplink data from the UE. ### Claim 30 (depends on 27) The base station according to claim 27, wherein said processing circuitry is further configured to provide a UE with an uplink grant for the purpose of maintaining uplink synchronization. ### Claim 31 (depends on 26) The base station according to claim 26, wherein said processing circuitry is further configured to generate an uplink grant of variable size.