# US 12,184,368 B2 · Beam training and initial access > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,368 B2 - Document ID: US12184368B2 - Status: Granted - Kind: B2 - Application number: 17/539,341 - Filed: 2021-12-01 - Published: 2022-03-24 - Granted: 2024-12-31 - Earliest claimed: 2017-03-23 - Assignees: InterDigital Patent Holdings, Inc. - Applicants: InterDigital Patent Holdings, Inc. - Inventors: Allan Y. Tsai; Guodong Zhang; Qing Li; Lakshmi R. Iyer; Pascal M. Adjakple; Joseph M. Murray - Web page: https://patentgrep.com/patent/US12184368B2 ## CPC - H04B 7/0617: {for beam forming} - H04B 7/0696: {Determining beam pairs} - 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 27/2613: {Structure of the reference signals} - H04L 27/2675: {Pilot or known symbols} - H04W 56/001: {Synchronization between nodes} - H04W 68/005: {Transmission of information for alerting of incoming communication} - H04W 68/025: {Indirect paging} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/30: Resource management for broadcast services - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 76/11: Allocation or use of connection identifiers - 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 The present application is at least directed to an apparatus including a non-transitory memory with stored instructions for beam link pairing the apparatus to a gNB in a new radio. A processor of the apparatus, operably coupled to the non-transitory memory, executes an instruction of detecting synchronization signal blocks (SS). Another executed instruction includes receiving PRACH resource information in a master information block on a PBCH or system information block (SIB) on the secondary PBCH. Another executed instruction includes transmitting PRACH preambles through a set of uplink transmission beams in a subframe including the group of SS blocks. The PRACH preambles may be obtained from the PRACH resource information. Even another executed instruction including determining the apparatus is in a radio resource control (RRC) connected state. A further executed instruction includes measuring, while in the RRC connected state, a multiple set of channel state information reference signals (CSI-RSs) configured by the gNB. Yet a further executed instruction includes transmitting, to the gNB, a single report based on the multiple set of CSI-RSs. ## Claims ### Claim 1 A wireless transmit/receive unit (WTRU) comprising a processor and memory, the processor and memory configured to: detect synchronization signal (SS) blocks; receive, from a gNB, physical random access channel (PRACH) resource information in a master information block (MIB) on a physical broadcast channel (PBCH) or a system information block (SIB) on a secondary PBCH (SPBCH), the PBCH or the SPBCH carrying system information indicating the PRACH resource information, the PRACH resource information being exclusively mapped for a group of the SS blocks, the SS blocks including a primary or secondary synchronous sequence and the PBCH; transmit PRACH preambles through a set of uplink transmission beams in a subframe including the group of SS blocks, the PRACH preambles being obtained from the PRACH resource information; determine the WTRU is in a radio resource control (RRC) connected state; determine a measurement based on detecting the reference signal received power (RSRP) of one or more channel state information reference signals (CSI-RSs) configured by the gNB; compare the measurement with a predefined threshold; and on the condition that the measurement is below the predefined threshold, transmit a report to the gNB, wherein the report comprises information related to the one or more CSI-RSs. ### Claim 2 (depends on 1) The WTRU of claim 1, wherein the WTRU is further configured to: monitor a physical downlink control channel (PDCCH) for a random access response (RAR) including a random access radio network temporary identifier (RA-RNTI); and determine the RA-RNTI corresponds to the transmitted PRACH preambles. ### Claim 3 (depends on 1) The WTRU of claim 1, wherein the PRACH preambles are obtained based on a Team ID associated with the group of SS blocks. ### Claim 4 (depends on 1) The WTRU of claim 1, wherein the SS blocks and the set of uplink transmission beams are separated by a gap. ### Claim 5 (depends on 1) The WTRU of claim 1, wherein a set of PRACH resources mapped to the SS blocks corresponds to a beam in a downlink for initial access. ### Claim 6 (depends on 5) The WTRU of claim 5, wherein the PRACH resources are semi-statically configured by the gNB. ### Claim 7 (depends on 1) The WTRU of claim 1, wherein the PRACH preambles include a preamble part and a message part. ### Claim 8 (depends on 7) The WTRU of claim 7, wherein a beam ID is signaled in the message part. ### Claim 9 (depends on 1) The WTRU of claim 1, wherein the PRACH preambles are swept through a set of potential uplink transmission beams. ### Claim 10 (depends on 1) The WTRU of claim 1, wherein a random access resource (RAR) includes an uplink transmission beam ID feedback of the WTRU. ### Claim 11 (depends on 1) The WTRU of claim 1, wherein the processor is further capable of: receiving a multiple set of channel reference information reference signal (CSIRS) configurations for the beam link pairing; and transmitting a single beam report feedback according to the multiple set of CSIRS configurations. ### Claim 12 (depends on 1) The WTRU of claim 1, wherein the WTRU is a smartphone, wearable device, tablet or laptop. ### Claim 13 A method for a wireless transmit/receive unit (WTRU), the method comprising: detecting synchronization signal (SS) blocks; receiving, from a gNB, physical random access channel (PRACH) resource information in a master information block (MIB) on a physical broadcast channel (PBCH) or a system information block (SIB) on a secondary PBCH (SPBCH), the PBCH or the SPBCH carrying system information indicating the PRACH resource information, the PRACH resource information being exclusively mapped for a group of the SS blocks, the SS blocks including a primary or secondary synchronous sequence and the PBCH; transmitting PRACH preambles through a set of uplink transmission beams in a subframe including the group of SS blocks, the PRACH preambles being obtained from the PRACH resource information; determining the WTRU is in a radio resource control (RRC) connected state; determining a measurement based on detecting the reference signal received power (RSRP) of one or more channel state information reference signals (CSI-RSs) configured by the gNB; comparing the measurement with a predefined threshold; and on the condition that the measurement is below the predefined threshold, transmitting, to the gNB, a single report, wherein the report comprises information related to the one or more based on the multiple set of CSI-RSs. ### Claim 14 (depends on 13) The method of claim 13, further comprising: monitoring a physical downlink control channel (PDCCH) for a random access response (RAR) including a random access radio network temporary identifier (RA-RNTI); and determining the RA-RNTI corresponds to the transmitted PRACH preambles. ### Claim 15 (depends on 13) The method of claim 13, wherein the PRACH preambles are obtained based on a Team ID associated with the group of SS blocks. ### Claim 16 (depends on 13) The method of claim 13, wherein the SS blocks and the set of uplink transmission beams are separated by a gap. ### Claim 17 (depends on 13) The method of claim 13, wherein a set of PRACH resources mapped to the SS blocks corresponds to a beam in a downlink for initial access. ### Claim 18 (depends on 17) The method of claim 17, wherein the PRACH resources are semi-statically configured by the gNB. ### Claim 19 (depends on 13) The method of claim 13, wherein the PRACH preambles include a preamble part and a message part. ### Claim 20 (depends on 19) The method of claim 19, wherein a beam ID is signaled in the message part.