# US 2021/0345425 A1 · Method and device for use in communication node for wireless communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345425 A1 - Document ID: US20210345425A1 - Status: Published application - Kind: A1 - Application number: 17/368,861 - Filed: 2021-07-07 - Published: 2021-11-04 - Earliest claimed: 2019-01-11 - Assignees: Shanghai Langbo Communication Technology Company Limited - Inventors: Zheng LIU; Xiaobo ZHANG - Web page: https://patentgrep.com/patent/US20210345425A1 ## CPC - H04W 74/0841: {with collision treatment} - H04L 1/0003: {by switching between different modulation schemes} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 74/0836: with 2-step access - H04W 74/0833: Random access procedures, e.g. with 4-step access - 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 The present disclosure provides a method and a device for use in communication node for wireless communications. The communication node transmits a first sequence; receives first information, and the first information is used to determine X candidate time lengths; transmits a second sequence and determines whether to transmit a second radio signal; a time interval between a time for transmitting the first sequence and a time for transmitting the second sequence is not less than a target time length; a first time length is equal to one of the X candidate time lengths, and the target time length is not greater than the first time length; when the first time length is greater than 0, the first communication node randomly selects the target time length between 0 and the first time length. The present disclosure improves random access performance. ## Claims ### Claim 1 A first communication node for wireless communications, comprising: a first transmitter, transmitting a first sequence; a first receiver, receiving first information, the first information being used to determine partial candidate time length(s) among X candidate time lengths, one of the X candidate time lengths being equal to 0, X being a positive integer greater than 1; and a second transmitter, transmitting a second sequence and determining whether to transmit a second radio signal; wherein a length of a time interval between a time for transmitting the first sequence and a time for transmitting the second sequence is not less than a target time length; a first time length is equal to one of the X candidate time lengths, and the target time length is not greater than the first time length; when the first time length is greater than 0, the first communication node randomly selects the target time length between 0 and the first time length; when the first time length is equal to 0, the target time length is equal to 0; whether the second radio signal is transmitted is used to determine the first time length out of the X candidate time lengths; the first information is transmitted through a PDSCH, and a MsgB-RNTI is used to generate an initial value of a generator of a scrambling sequence of the PDSCH carrying the first information. ### Claim 2 (depends on 1) The first communication node according to claim 1, wherein the first transmitter also transmits a first radio signal, the first sequence is used to indicate at least one of time-frequency resources occupied by the first radio signal, a Modulation and Coding Scheme (MCS) adopted by the first radio signal or a Redundancy Version (RV) adopted by the first radio signal; radio resources occupied by the first sequence are associated with one of time-frequency resources occupied by the first radio signal, an MCS adopted by the first radio signal or an RV adopted by the first radio signal, and the radio resources comprise time-frequency resources and/or code-domain resources; the first radio signal comprises a PUSCH and a DMRS. ### Claim 3 (depends on 1) The first communication node according to claim 1, wherein radio resources occupied by the second sequence belong to a first radio resource block, the first radio resource block belongs to a first radio resource group, and the first radio resource group is one of Y radio resource groups, Y being a positive integer greater than 1; whether the second radio signal is transmitted is used to determine the first radio resource group out of the Y radio resource groups. ### Claim 4 (depends on 3) The first communication node according to claim 3, wherein whether the second radio signal is transmitted and a state of the first communication node (RRC_IDLE, RRC_CONNECTED or RRC_INACTIVE) are used together to determine the first radio resource group out of the Y radio resource groups; or whether the second radio signal is transmitted and a reason for triggering a transmission of the second sequence are used together to determine the first radio resource group out of the Y radio resource groups. ### Claim 5 (depends on 1) The first communication node according to claim 1, wherein the first receiver also receives second information, the first information and the second information are respectively used to determine the X candidate time lengths, X being equal to 2; the first information comprises all or part of a subheader in a MsgB in a 2-Step RACH, or the first information comprises all or part of a Control Element (CE) in a MsgB in a 2-Step RACH; the second information comprises all or partial fields in an IE in an RRC signaling, and the second information is broadcast; the first information and the second information are transmitted through different PDSCHs. ### Claim 6 (depends on 1) The first communication node according to claim 1, wherein the first communication node is in an RRC_INACTIVE state, and an end time for transmitting the first sequence is not later than a start time for receiving the first information. ### Claim 7 (depends on 1) The first communication node according to claim 1, wherein the first information is an MsgB for the first sequence, and a response time window for the first sequence is a first time window, a length of a time interval between an end time of the first time window and a start time for transmitting the second sequence is not less than the target time length; the first communication node randomly selects the target time length according to a uniform distribution between 0 and the first time length. ### Claim 8 A second communication node for wireless communications, comprising: a second receiver, receiving a first sequence; a third transmitter, transmitting first information, the first information being used to determine partial candidate time length(s) among X candidate time lengths, X being a positive integer greater than 1; and a third receiver, receiving a second sequence and determining whether a second radio signal is transmitted; wherein a length of a time interval between a time for transmitting the first sequence and a time for transmitting the second sequence is not less than a target time length; a first time length is equal to one of the X candidate time lengths, and the target time length is not greater than the first time length; when the first time length is greater than 0, a transmitter of the first sequence randomly selects the target time length between 0 and the first time length; when the first time length is equal to 0, the target time length is equal to 0; whether the second radio signal is transmitted is used to determine the first time length out of the X candidate time lengths; the first information is transmitted through a PDSCH, and a MsgB-RNTI is used to generate an initial value of a generator of a scrambling sequence of the PDSCH carrying the first information. ### Claim 9 (depends on 8) The second communication node according to claim 8, wherein the second receiver also receives a first radio signal, the first sequence is used to indicate at least one of time-frequency resources occupied by the first radio signal, an MCS adopted by the first radio signal or an RV adopted by the first radio signal; radio resources occupied by the first sequence are associated with one of time-frequency resources occupied by the first radio signal, an MCS adopted by the first radio signal or an RV adopted by the first radio signal, and the radio resources comprise time-frequency resources and/or code-domain resources; the first radio signal comprises a PUSCH and a DMRS. ### Claim 10 (depends on 8) The second communication node according to claim 8, wherein radio resources occupied by the second sequence belong to a first radio resource block, the first radio resource block belongs to a first radio resource group, and the first radio resource group is one of Y radio resource groups, Y being a positive integer greater than 1; whether the second radio signal is transmitted is used to determine the first radio resource group out of the Y radio resource groups. ### Claim 11 (depends on 10) The second communication node according to claim 10, wherein whether the second radio signal is transmitted and a state of a transmitter of the first sequence (RRC_IDLE, RRC_CONNECTED or RRC_INACTIVE) are used together to determine the first radio resource group out of the Y radio resource groups; or whether the second radio signal is transmitted and a reason for triggering a transmission of the second sequence are used together to determine the first radio resource group out of the Y radio resource groups. ### Claim 12 (depends on 8) The second communication node according to claim 8, wherein the third transmitter also transmits second information, the first information and the second information are respectively used to determine the X candidate time lengths, X being equal to 2; the first information comprises all or part of a subheader in a MsgB in a 2-Step RACH, or the first information comprises all or part of a CE in a MsgB in a 2-Step RACH; the second information comprises all or partial fields in an IE in an RRC signaling, and the second information is broadcast; the first information and the second information are transmitted through different PDSCHs. ### Claim 13 (depends on 8) The second communication node according to claim 8, wherein the first information is an MsgB for the first sequence, and a response time window for the first sequence is a first time window, a length of a time interval between an end time of the first time window and a start time for transmitting the second sequence is not less than the target time length; a transmitter of the first sequence randomly selects the target time length according to a uniform distribution between 0 and the first time length. ### Claim 14 A method in a first communication node for wireless communications, comprising: transmitting a first sequence; receiving first information, the first information being used to determine partial candidate time length(s) among X candidate time lengths, X being a positive integer greater than 1; and transmitting a second sequence and determining whether to transmit a second radio signal; wherein a length of a time interval between a time for transmitting the first sequence and a time for transmitting the second sequence is not less than a target time length; a first time length is equal to one of the X candidate time lengths, and the target time length is not greater than the first time length; when the first time length is greater than 0, the first communication node randomly selects the target time length between 0 and the first time length; when the first time length is equal to 0, the target time length is equal to 0; whether the second radio signal is transmitted is used to determine the first time length out of the X candidate time lengths; the first information is transmitted through a PDSCH, and a MsgB-RNTI is used to generate an initial value of a generator of a scrambling sequence of the PDSCH carrying the first information. ### Claim 15 (depends on 14) The method in a first communication node according to claim 14, comprising: transmitting a first radio signal; wherein the first sequence is used to indicate at least one of time-frequency resources occupied by the first radio signal, an MCS adopted by the first radio signal or an RV adopted by the first radio signal; radio resources occupied by the first sequence are associated with one of time-frequency resources occupied by the first radio signal, an MCS adopted by the first radio signal or an RV adopted by the first radio signal, and the radio resources comprise time-frequency resources and/or code-domain resources; the first radio signal comprises a PUSCH and a DMRS. ### Claim 16 (depends on 14) The method in a first communication node according to claim 14, wherein radio resources occupied by the second sequence belong to a first radio resource block, the first radio resource block belongs to a first radio resource group, and the first radio resource group is one of Y radio resource groups, Y being a positive integer greater than 1; whether the second radio signal is transmitted is used to determine the first radio resource group out of the Y radio resource groups. ### Claim 17 (depends on 16) The method in a first communication node according to claim 16, wherein whether the second radio signal is transmitted and a state of the first communication node (RRC_IDLE, RRC_CONNECTED or RRC_INACTIVE) are used together to determine the first radio resource group out of the Y radio resource groups; or whether the second radio signal is transmitted and a reason for triggering a transmission of the second sequence are used together to determine the first radio resource group out of the Y radio resource groups. ### Claim 18 (depends on 14) The method in a first communication node according to claim 14, comprising: receiving second information; wherein the first information and the second information are respectively used to determine the X candidate time lengths, X being equal to 2; the first information comprises all or part of a subheader in MsgB in 2-Step RACH, or the first information comprises all or part of a CE in a MsgB in a 2-Step RACH; the second information comprises all or partial fields in an IE in an RRC signaling, and the second information is broadcast; the first information and the second information are transmitted through different PDSCHs. ### Claim 19 (depends on 14) The method in a first communication node according to claim 14, wherein the first communication node is in an RRC_INACTIVE state, and an end time for transmitting the first sequence is not later than a start time for receiving the first information. ### Claim 20 (depends on 14) The method in a first communication node according to claim 14, wherein the first information is an MsgB for the first sequence, and a response time window for the first sequence is a first time window, a length of a time interval between an end time of the first time window and a start time for transmitting the second sequence is not less than the target time length; the first communication node randomly selects the target time length according to a uniform distribution between 0 and the first time length.