# US 10,484,143 B2 · Method and device for short-latency communications in UE and base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,143 B2 - Document ID: US10484143B2 - Status: Granted - Kind: B2 - Application number: 16/118,451 - Filed: 2018-08-31 - Published: 2018-12-27 - Granted: 2019-11-19 - Earliest claimed: 2016-03-03 - Assignees: Shanghai Langbo Communication Technology Company Limited - Applicants: Shanghai Langbo Communication Technology Company Limited - Inventors: Xiaobo Zhang - Web page: https://patentgrep.com/patent/US10484143B2 ## CPC - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 88/02: Terminal devices - 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 The disclosure provides a method and a device for reducing latency in radio communications. A User Equipment (UE) first receives K radio signal groups and then transmits an uplink signaling, K being a positive integer greater than 1 and the uplink signaling including HARQ-ACK information, wherein lengths of Enhanced Transmission Time Intervals (eTTIs) corresponding to the K radio signal groups correspond to K time lengths respectively, and any two time lengths of the K time lengths are not equal. The HARQ-ACK information indicates whether a coding block in the K radio signal groups is correctly decoded. The numbers of radio signals in the K radio signal groups are Q1, . . . , QK respectively, the Q1, . . . , QK being positive integers respectively. The disclosure avoids the occurrence that the UE transmits multiple uplink signalings simultaneously, and improves the robustness of HARQ-ACK under power limited conditions. In addition, the disclosure reduces radio overhead and increases transmission efficiency. ## Claims ### Claim 1 A method in a User Equipment (UE) supporting short-latency radio communications, comprising: receiving K radio signal groups, K being a positive integer greater than 1; transmitting a single uplink signaling related to correct decoding of the received K radio signal groups, the single uplink signaling comprising HARQ-ACK information; wherein: the K radio signal groups are received in K time windows on a same carrier, and any two time windows of the K time windows are orthogonal in the time domain; lengths of Enhanced Transmission Time Intervals (eTTIs) corresponding to the K radio signal groups correspond to K time lengths respectively, and any two time lengths of the K time lengths are not equal; the HARQ-ACK information indicates whether a coding block in each of the K radio signal groups is correctly decoded; the number of radio signals in the K radio signal groups are Q1, . . . , QK respectively, the Q1, . . . , QK being positive integers respectively; and in the K radio signal groups that are associated with the uplink signaling, an eTTI length corresponding to a radio signal group transmitted earlier is greater than an eTTI length corresponding to a radio signal group transmitted later. ### Claim 2 (depends on 1) The method according to claim 1, wherein the K radio signal groups are transmitted in K time windows on one same carrier respectively, and any two time windows of the K time windows are orthogonal in time domain; or, a maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is related to a position of a time domain resource occupied by the uplink signaling in an LTE subframe; or, a minimum eTTI length that the radio signal associated with the HARQ-ACK information can support is not related to a position of a time interval occupied by the uplink signaling in an LTE subframe; or, the time interval occupied by the uplink signaling is the first one of the multiple time intervals that can be used for transmitting the HARQ-ACK information in the LTE subframe, and the maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is 1 ms. ### Claim 3 (depends on 1) The method according to claim 1, comprising: conducting blind decoding in L time windows, and receiving K downlink signaling groups in the L time windows; wherein L is a positive integer; the number of downlink signalings in the K downlink signaling groups are Q1, . . . , QK respectively; the K downlink signaling groups and the K radio signal groups are in one-to-one correspondence; the downlink signaling in the downlink signaling group and the radio signal in the corresponding radio signal group are in one-to-one correspondence; and the downlink signaling comprises scheduling information of the corresponding radio signal, and the scheduling information comprises at least one of {Modulating and Coding Status (MCS), New Data Indicator (NM), Redundancy Version (RV), and Transport Block Size (TBS)}. ### Claim 4 (depends on 3) The method according to claim 3, wherein the downlink signaling is a physical layer signaling, and the downlink signaling further comprises HARQ auxiliary information; the given HARQ auxiliary information indicates a cumulative number of the downlink signaling associated with the radio signal in a target time window set and Downlink Control Information (DCIs) indicating Semi-Persistent Scheduling (SPS) release; the target time window set is a set of all the time windows having an end time not later than an end time of a given time window in the L time windows, and the given time window is a time window occupied by the HARQ auxiliary information. ### Claim 5 (depends on 1) The method according to claim 1, comprising: receiving a high-layer signaling, wherein at least the former one of {a length of the time interval occupied by the uplink signaling, a time domain resource occupied by the uplink signaling} is determined according to the high-layer signaling. ### Claim 6 A method in a base station supporting short-latency radio communications, comprising: transmitting K radio signal groups, K being a positive integer greater than 1; receiving a single uplink signaling related to correct decoding of the transmitted K radio signal groups, the single uplink signaling comprising HARQ-ACK information; wherein: the K radio signal groups are transmitted in K time windows on a same carrier, and any two time windows of the K time windows are orthogonal in the time domain; lengths of Enhanced Transmission Time Intervals (eTTIs) corresponding to the K radio signal groups correspond to K time lengths respectively, and any two time lengths of the K time lengths are not equal; the HARQ-ACK information indicates whether a coding block in each of the K radio signal groups is correctly decoded; the number of radio signals in the K radio signal groups are Q1, . . . , QK respectively, the Q1, . . . , QK being positive integers respectively; and in the K radio signal groups that are associated with the uplink signaling, an eTTI length corresponding to a radio signal group transmitted earlier is greater than an eTTI length corresponding to a radio signal group transmitted later. ### Claim 7 (depends on 6) The method according to claim 6, wherein the K radio signal groups are transmitted in K time windows on one same carrier respectively, and any two time windows of the K time windows are orthogonal in time domain; or, a maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is related to a position of a time domain resource occupied by the uplink signaling in an LTE subframe; or, a minimum eTTI length that the radio signal associated with the HARQ-ACK information can support is not related to a position of a time interval occupied by the uplink signaling in an LTE subframe; or, the time interval occupied by the uplink signaling is the first one of the multiple time intervals that can be used for transmitting the HARQ-ACK information in the LTE subframe, and the maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is 1 ms. ### Claim 8 (depends on 6) The method according to claim 6, comprising: transmitting K downlink signaling groups in L time windows; wherein L is a positive integer; the number of downlink signalings in the K downlink signaling groups are Q1, . . . , QK respectively; the K downlink signaling groups and the K radio signal groups are in one-to-one correspondence; the downlink signaling in the downlink signaling group and the radio signal in the corresponding radio signal group are in one-to-one correspondence; and the downlink signaling comprises scheduling information of the corresponding radio signal, and the scheduling information comprises at least one of {Modulating and Coding Status (MCS), New Data Indicator (NDI), Redundancy Version (RV), and Transport Block Size (TBS)}. ### Claim 9 (depends on 8) The method according to claim 8, wherein the downlink signaling is a physical layer signaling, and the downlink signaling further comprises HARQ auxiliary information; the given HARQ auxiliary information indicates a cumulative number of the downlink signaling associated with the radio signal in a target time window set and Downlink Control Information (DCIs) indicating Semi-Persistent Scheduling (SPS) release; the target time window set is a set of all the time windows having an end time not later than an end time of a given time window in the L time windows, and the given time window is a time window occupied by the HARQ auxiliary information. ### Claim 10 (depends on 6) The method according to claim 6, comprising: Step A1: transmitting a high-layer signaling, wherein at least the former one of {a length of the time interval occupied by the uplink signaling, a time domain resource occupied by the uplink signaling} is determined according to the high-layer signaling. ### Claim 11 A UE supporting short-latency radio communications, comprising: a first receiving module, to receive K radio signal groups, K being a positive integer greater than 1; a first transmitting module, to transmit a single uplink signaling related to correct decoding of the received K radio signal groups, the single uplink signaling comprising HARQ-ACK information; wherein: the K radio signal groups are received in K time windows on a same carrier, and any two time windows of the K time windows are orthogonal in the time domain; lengths of Enhanced Transmission Time Intervals (eTTIs) corresponding to the K radio signal groups correspond to K time lengths respectively, and any two time lengths of the K time lengths are not equal; the HARQ-ACK information indicates whether a coding block in each of the K radio signal groups is correctly decoded; the number of radio signals in the K radio signal groups are Q1, . . . , QK respectively, the Q1, . . . , QK being positive integers respectively; and in the K radio signal groups that are associated with the uplink signaling, an eTTI length corresponding to a radio signal group transmitted earlier is greater than an eTTI length corresponding to a radio signal group transmitted later. ### Claim 12 (depends on 11) The UE according to claim 11, wherein the first receiving module is further configured to perform at least one of the following: conducting blind decoding in L time windows, and receiving K downlink signaling groups in the L time windows; receiving a high-layer signaling, wherein at least the former one of {a length of the time interval occupied by the uplink signaling, a time domain resource occupied by the uplink signaling} is determined according to the high-layer signaling; wherein L is a positive integer; the number of downlink signalings in the K downlink signaling groups are Q1, . . . , QK respectively; the K downlink signaling groups and the K radio signal groups are in one-to-one correspondence; the downlink signaling in the downlink signaling group and the radio signal in the corresponding radio signal group are in one-to-one correspondence; and the downlink signaling comprises scheduling information of the corresponding radio signal, and the scheduling information comprises at least one of {Modulating and Coding Status (MCS), New Data Indicator (NDI), Redundancy Version (RV), and Transport Block Size (TBS)}. ### Claim 13 (depends on 11) The UE according to claim 11, wherein the K radio signal groups are transmitted in K time windows on one same carrier respectively, and any two time windows of the K time windows are orthogonal in time domain; or, a maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is related to a position of a time domain resource occupied by the uplink signaling in an LTE subframe; or, a minimum eTTI length that the radio signal associated with the HARQ-ACK information can support is not related to a position of a time interval occupied by the uplink signaling in an LTE subframe; or, the time interval occupied by the uplink signaling is the first one of the multiple time intervals that can be used for transmitting the HARQ-ACK information in the LTE subframe, and the maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is 1 ms. ### Claim 14 (depends on 12) The UE according to claim 12, wherein the downlink signaling is a physical layer signaling, and the downlink signaling further comprises HARQ auxiliary information; the given HARQ auxiliary information indicates a cumulative number of the downlink signaling associated with the radio signal in a target time window set and Downlink Control Information/DCIs) indicating Semi-Persistent Scheduling (SPS) release; the target time window set is a set of all the time windows having an end time not later than an end time of a given time window in the L time windows, and the given time window is a time window occupied by the HARQ auxiliary information. ### Claim 15 Abase station device supporting short-latency radio communications, comprising: a second transmitting module, to transmit K radio signal groups, K being a positive integer greater than 1; a second receiving module, to receive a single uplink signaling related to correct decoding of the transmitted K radio signal groups, the single uplink signaling comprising HARQ-ACK information; wherein: the K radio signal groups are transmitted in K time windows on a same carrier, and any two time windows of the K time windows are orthogonal in the time domain; lengths of Enhanced Transmission Time Intervals (eTTIs) corresponding to the K radio signal groups correspond to K time lengths respectively, and any two time lengths of the K time lengths are not equal; the HARQ-ACK information indicates whether a coding block in each of the K radio signal groups is correctly decoded; the number of radio signals in the K radio signal groups are Q1, . . . , QK respectively, the Q1, . . . , QK being positive integers respectively; and in the K radio signal groups that are associated with the uplink signaling, an eTTI length corresponding to a radio signal group transmitted earlier is greater than an eTTI length corresponding to a radio signal group transmitted later. ### Claim 16 (depends on 15) The base station device according to claim 15, wherein the second transmitting module is further configured to perform at least one of the following: transmitting K downlink signaling groups in L time windows; transmitting a high-layer signaling, wherein at least the former one of {a length of the time interval occupied by the uplink signaling, a time domain resource occupied by the uplink signaling} is determined according to the high-layer signaling; wherein L is a positive integer; the number of downlink signalings in the K downlink signaling groups are Q1, . . . , QK respectively; the K downlink signaling groups and the K radio signal groups are in one-to-one correspondence; the downlink signaling in the downlink signaling group and the radio signal in the corresponding radio signal group are in one-to-one correspondence; and the downlink signaling comprises scheduling information of the corresponding radio signal, and the scheduling information comprises at least one of {Modulating and Coding Status (MCS), New Data Indicator (NDI), Redundancy Version (RV), and Transport Block Size (TBS)}. ### Claim 17 (depends on 15) The base station device according to claim 15, wherein the K radio signal groups are transmitted in K time windows on one same carrier respectively, and any two time windows of the K time windows are orthogonal in time domain; or, a maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is related to a position of a time domain resource occupied by the uplink signaling in an LTE subframe; or, a minimum eTTI length that the radio signal associated with the HARQ-ACK information can support is not related to a position of a time interval occupied by the uplink signaling in an LTE subframe; or, the time interval occupied by the uplink signaling is the first one of the multiple time intervals that can be used for transmitting the HARQ-ACK information in the LTE subframe, and the maximum eTTI length that the radio signal associated with the HARQ-ACK information can support is 1 ms. ### Claim 18 (depends on 15) The base station device according to claim 15, wherein the second transmitting module transmits a high-layer signaling, and at least the former one of {a length of the time interval occupied by the uplink signaling, a time domain resource occupied by the uplink signaling} is determined according to the high-layer signaling.