# US 11,909,520 B2 · Method and device in communication nodes used for random access in wireless communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,520 B2 - Document ID: US11909520B2 - Status: Granted - Kind: B2 - Application number: 17/845,980 - Filed: 2022-06-21 - Published: 2022-10-06 - Granted: 2024-02-20 - Earliest claimed: 2019-05-09 - Assignees: Honor Device Co., Ltd. - Applicants: Honor Device Co., Ltd. - Inventors: Zheng Liu; Xiaobo Zhang - Web page: https://patentgrep.com/patent/US11909520B2 ## CPC - H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)} - H04W 56/0045: {compensating for timing error by altering transmission time} - H04L 1/0041: {Arrangements at the transmitter end} - H04L 1/0061: {Error detection codes} - H04L 1/0072: {Error control for data other than payload data, e.g. control data} - H04L 5/0082: {at predetermined intervals} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/0446: Resources in time domain, e.g. slots or frames - 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 communication node receives first information, transmits a first radio signal and monitors a first-type signaling in a first time window; an end time for a transmission of the first radio signal is used for determining a start of the first time window, a time-domain resource occupied by the first radio signal is used for determining a first characteristic identity; the first characteristic identity is one of M characteristic identities, the M is a positive integer greater than 1, and the first information is used for determining the M characteristic identities; the first-type signaling carries one of the M characteristic identities, the communication node determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection. The method helps improve random access performance. ## Claims ### Claim 1 A first communication node used for wireless communications, comprising: a first receiver, receiving first information; a first transmitter, transmitting a first radio signal; and a second receiver, monitoring a first-type signaling in a first time window; wherein: an end time for a transmission of the first radio signal is used for determining a start of the first time window, the end time for a transmission of the first radio signal is earlier than the start of the first time window; time-domain resource(s) occupied by the first radio signal is(are) used for determining a first characteristic identity; the first characteristic identity is one of M characteristic identities, M being a positive integer greater than 1; the first information is used for determining the M characteristic identities; the first-type signaling carries one of the M characteristic identities; the first communication node determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection; any of the M characteristic identities is an RNTI equal to a hexadecimal integer through FFF0 and FFFD; and the first-type signaling is transmitted through a PDCCH, the monitoring on the first-type signaling is performed in common search space (CSS). ### Claim 2 (depends on 1) The first communication node according to claim 1, wherein: the first receiver receives second information; the second information is used for indicating a reference Round Trip Time (RTT) between a transmitter of the second information and a transmitter of the first radio signal, and a length of a time interval between the start of the first time window and the end time for a transmission of the first radio signal is positively linear with the reference RTT; and the second information comprises one or more fields of a System Information Block (SIB). ### Claim 3 (depends on 1) The first communication node according to claim 1, wherein: the first transmitter transmits a second radio signal; the second radio signal carries third information, the third information is used for indicating a position of time-domain resources occupied by the first radio signal in time domain, and a start time for a transmission of the second radio signal is later than the end time for a transmission of the first radio signal; the second radio signal carries an initial transmission or a retransmission of an Msg3, the third information comprises all or part of a MAC control element (CE). ### Claim 4 (depends on 1) The first communication node according to claim 1, wherein: the first information is used for determining a length of the first time window. ### Claim 5 (depends on 1) The first communication node according to claim 1, wherein: the second receiver receives a third radio signal carrying fourth information; the first-type signaling detected in the first time window is used for determining time-frequency resources occupied by the third radio signal; the fourth information is used for determining a first timing advance; and the first timing advance is used for determining a transmission timing of a radio signal transmitted later than the first radio signal. ### Claim 6 (depends on 1) The first communication node according to claim 1, wherein: the first radio signal comprises a PRACH and a Physical Uplink Shared Channel (PUSCH); the first radio signal carries a message (Msg) A for 2-step random access; and the end time for a transmission of the first radio signal is an end time for a transmission of a PUSCH comprised in the first radio signal. ### Claim 7 (depends on 1) The first communication node according to claim 1, wherein: the first time window comprises a positive integer number of contiguous slots with a given subcarrier spacing (SCS); and the start of the first time window is a start time for an earliest Type I PDCCH CSS set not earlier than the end time for the transmission of the first radio signal. ### Claim 8 A second communication node used for wireless communications, comprising: a second transmitter, transmitting first information; a third receiver, receiving a first radio signal; and a third transmitter, transmitting a first-type signaling in a first time window; wherein: an end time for a transmission of the first radio signal is used for determining a start of the first time window, the end time for a transmission of the first radio signal is earlier than the start of the first time window; time-domain resource(s) occupied by the first radio signal is(are) used for determining a first characteristic identity; the first characteristic identity is one of M characteristic identities, M being a positive integer greater than 1; the first information is used for determining the M characteristic identities; the first-type signaling carries one of the M characteristic identities; a transmitter of the first radio signal determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection; any of the M characteristic identities is an RNTI equal to a hexadecimal integer through FFF0 and FFFD; and the first-type signaling is transmitted through a PDCCH, the monitoring on the first-type signaling is performed in common search space (CSS). ### Claim 9 (depends on 8) The second communication node according to claim 8, wherein: the second transmitter transmits second information; the second information is used for indicating a reference Round Trip Time (RTT) between a transmitter of the second information and a transmitter of the first radio signal, and a length of a time interval between the start of the first time window and the end time for a transmission of the first radio signal is positively linear with the reference RTT; and the second information comprises one or more fields of a System Information Block (SIB). ### Claim 10 (depends on 8) The second communication node according to claim 8, wherein: the third receiver receives a second radio signal; the second radio signal carries third information, the third information is used for indicating a position of time-domain resources occupied by the first radio signal in time domain, and a start time for a transmission of the second radio signal is later than the end time for a transmission of the first radio signal; the second radio signal carries an initial transmission or a retransmission of an Msg3, the third information comprises all or part of a MAC control element (CE). ### Claim 11 (depends on 8) The second communication node according to claim 8, wherein: the third transmitter transmits a third radio signal carrying fourth information; the first-type signaling detected in the first time window is used for determining time-frequency resources occupied by the third radio signal; the fourth information is used for determining a first timing advance; and the first timing advance is used for determining a transmission timing of a radio signal transmitted later than the first radio signal. ### Claim 12 (depends on 8) The second communication node according to claim 8, wherein: the first radio signal comprises a PRACH and a Physical Uplink Shared Channel (PUSCH); the first radio signal carries a message (Msg) A for 2-step random access; and the end time for a transmission of the first radio signal is an end time for a transmission of a PUSCH comprised in the first radio signal. ### Claim 13 (depends on 8) The second communication node according to claim 8, wherein: the first time window comprises a positive integer number of contiguous slots with a given subcarrier spacing (SCS); and the start of the first time window is a start time for an earliest Type I PDCCH CSS set not earlier than the end time for a transmission of the first radio signal. ### Claim 14 A method in a first communication node used for wireless communications, comprising: receiving first information; transmitting a first radio signal; and monitoring a first-type signaling in a first time window; wherein: an end time for a transmission of the first radio signal is used for determining a start of the first time window, the end time for a transmission of the first radio signal is earlier than the start of the first time window; time-domain resource(s) occupied by the first radio signal is(are) used for determining a first characteristic identity; the first characteristic identity is one of M characteristic identities, M being a positive integer greater than 1; the first information is used for determining the M characteristic identities; the first-type signaling carries one of the M characteristic identities; the first communication node determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection; any of the M characteristic identities is an RNTI equal to a hexadecimal integer through FFF0 and FFFD; and the first-type signaling is transmitted through a PDCCH, the monitoring on the first-type signaling is performed in common search space (CSS). ### Claim 15 (depends on 14) The method in the first communication node according to claim 14, comprising: receiving second information; wherein the second information is used for indicating a reference Round Trip Time (RTT) a transmitter of the second information and a transmitter of the first radio signal, and a length of a time interval between the start of the first time window and the end time for a transmission of the first radio signal is positively linear with the reference RTT; and the second information comprises one or more fields of a System Information Block (SIB). ### Claim 16 (depends on 14) The method in the first communication node according to claim 14, comprising: transmitting a second radio signal; wherein the second radio signal carries third information, the third information is used for indicating a position of time-domain resources occupied by the first radio signal in time domain, and a start time for a transmission of the second radio signal is later than the end time for a transmission of the first radio signal; the second radio signal carries an initial transmission or a retransmission of an Msg3, the third information comprises all or part of a MAC control element (CE). ### Claim 17 (depends on 14) The method in the first communication node according to claim 14, wherein: the first information is used for determining a length of the first time window. ### Claim 18 (depends on 14) The method in the first communication node according to claim 14, comprising: receiving a third radio signal carrying fourth information; wherein the first-type signaling detected in the first time window is used for determining time-frequency resources occupied by the third radio signal; the fourth information is used for determining a first timing advance and the first timing advance is used for determining a transmission timing of a radio signal transmitted later than the first radio signal. ### Claim 19 (depends on 14) The method in the first communication node according to claim 14, wherein: the first radio signal comprises a PRACH and a Physical Uplink Shared Channel (PUSCH); the first radio signal carries a message (Msg) A for 2-step random access; and the end time for a transmission of the first radio signal is an end time for a transmission of a PUSCH comprised in the first radio signal. ### Claim 20 (depends on 14) The method in the first communication node according to claim 14, wherein: the first time window comprises a positive integer number of contiguous slots with a given subcarrier spacing (SCS); and the start of the first time window is a start time for an earliest Type I PDCCH CSS set not earlier than the end time for a transmission of the first radio signal.