# US 11,310,836 B2 · Repetition of PRACH preamble transmission for UEs > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,836 B2 - Document ID: US11310836B2 - Status: Granted - Kind: B2 - Application number: 16/947,575 - Filed: 2020-08-06 - Published: 2021-02-25 - Granted: 2022-04-19 - Earliest claimed: 2019-08-19 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Ebrahim MolavianJazi; Aris Papasakellariou - Web page: https://patentgrep.com/patent/US11310836B2 ## CPC - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 1/189: {Transmission or retransmission of more than one copy of a message} - H04L 1/1896: {ARQ related signaling} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0058: {Allocation criteria} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 48/12: using downlink control channel - H04W 56/001: {Synchronization between nodes} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0023: {Time-frequency-space} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04W 74/0836: with 2-step access - H04W 74/0838: using contention-free random access [CFRA] - 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 Apparatuses and methods for physical random access channel (PRACH) preamble transmissions or receptions. A method of a UE includes receiving a physical downlink shared channel (PDSCH) that provides a system information block (SIB). The SIB includes an indication for (i) a first transmission configuration indication (TCI) state that provides a first set of quasi-collocation (QCL) properties and (ii) for a second TCI state that provides a second set of QCL properties. The method further includes transmitting a first PRACH according to the first TCI state and a second PRACH according to the second TCI state. ## Claims ### Claim 1 A method comprising: receiving a physical downlink shared channel (PDSCH) that provides a system information block (SIB), wherein the SIB includes an indication for (i) a first transmission configuration indication (TCI) state that provides a first set of quasi-collocation (QCL) properties and (ii) for a second TCI state that provides a second set of QCL properties; and transmitting a first physical random access channel (PRACH) according to the first TCI state and a second PRACH according to the second TCI state. ### Claim 2 (depends on 1) The method of claim 1, further comprising: receiving a synchronization signal and broadcast channel block; measuring a reference signal received power (RSRP) value based on the synchronization signal and broadcast channel block; and determining to transmit the first PRACH according to the first TCI state and the second PRACH according to the second TCI state based on the RSRP value being smaller than an RSRP threshold, wherein the RSRP threshold is included in the SIB. ### Claim 3 (depends on 1) The method of claim 1, wherein: transmitting the second PRACH comprises transmitting the second PRACH with a number of repetitions, and the number of repetitions is included in the SIB. ### Claim 4 (depends on 1) The method of claim 1, wherein the first PRACH transmission is from a first antenna port and the second PRACH transmission is from a second antenna port. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving: at least one of a first physical downlink control channel (PDCCH) according to the first TCI state and a second PDCCH according to the second TCI state, wherein the first PDCCH schedules a reception of a first PDSCH and the second PDCCH schedules a reception of a second PDSCH; and the first PDSCH according to the first TCI state or the second PDSCH according to the second TCI state, wherein the received first PDSCH or second PDSCH includes a random access response (RAR) message in response to the first PRACH transmission or the second PRACH transmission. ### Claim 6 (depends on 5) The method of claim 5, further comprising: transmitting a physical uplink shared channel (PUSCH) that is scheduled by information in the RAR message, wherein the PUSCH transmission is according to the first TCI state when the RAR message is included in the first PDSCH or the second TCI state when the RAR message is included in the second PDSCH. ### Claim 7 (depends on 5) The method of claim 5, further comprising: receiving the first PDCCH from a first antenna port and the second PDCCH from a second antenna port. ### Claim 8 A user equipment (UE) comprising: a transceiver configured to: receive a physical downlink shared channel (PDSCH) that provides a system information block (SIB), wherein the SIB includes an indication for (i) a first transmission configuration indication (TCI) state that provides a first set of quasi-collocation (QCL) properties and (ii) for a second TCI state that provides a second set of QCL properties; and transmit a first physical random access channel (PRACH) according to the first TCI state and a second PRACH according to the second TCI state. ### Claim 9 (depends on 8) The UE of claim 8, wherein the transceiver is further configured to receive a synchronization signal and broadcast channel block, the UE further comprising: a processor configured to: measure a reference signal received power (RSRP) value based on a synchronization signal and broadcast channel block; and determine to transmit the first PRACH according to the first TCI state and the second PRACH according to the second TCI state based on the RSRP value being smaller than an RSRP threshold, wherein the RSRP threshold is included in the SIB. ### Claim 10 (depends on 8) The UE of claim 8, wherein: the transceiver is configured to transmit the second PRACH with a number of repetitions, and the number of repetitions is included in the SIB. ### Claim 11 (depends on 8) The UE of claim 8, wherein the first PRACH transmission is from a first antenna port and the second PRACH transmission is from a second antenna port. ### Claim 12 (depends on 8) The UE of claim 8, wherein the transceiver is further configured to receive: at least one of a first physical downlink control channel (PDCCH) according to the first TCI state and a second PDCCH according to the second TCI state, wherein the first PDCCH schedules a reception of a first PDSCH and the second PDCCH schedules a reception of a second PDSCH; and the first PDSCH according to the first TCI state or the second PDSCH according to the second TCI state, wherein the received first PDSCH or second PDSCH includes a random access response (RAR) message in response to the first PRACH transmission or the second PRACH transmission. ### Claim 13 (depends on 12) The UE of claim 12, wherein: the transceiver is further configured to transmit a physical uplink shared channel (PUSCH) that is scheduled by information in the RAR message, and the PUSCH transmission is according to the first TCI state when the RAR message is included in the first PDSCH or the second TCI state when the RAR message is included in the second PDSCH. ### Claim 14 (depends on 12) The UE of claim 12, wherein the transceiver is further configured to receive the first PDCCH from a first antenna port and the second PDCCH from a second antenna port. ### Claim 15 A base station comprising: a transceiver configured to: transmit a physical downlink shared channel (PDSCH) that provides a system information block (SIB), wherein the SIB includes an indication for (i) a first transmission configuration indication (TCI) state that provides a first set of quasi-collocation (QCL) properties and (ii) for a second TCI state that provides a second set of QCL properties; and receive a first physical random access channel (PRACH) according to the first TCI state and a second PRACH according to the second TCI state. ### Claim 16 (depends on 15) The base station of claim 15, wherein: the transceiver is further configured to receive the second PRACH with a number of repetitions, and the number of repetitions is included in the SIB. ### Claim 17 (depends on 15) The base station of claim 15, wherein the first PRACH reception is by a first antenna port and the second PRACH reception is by a second antenna port. ### Claim 18 (depends on 15) The base station of claim 15, wherein the transceiver is further configured to transmit: at least one of a first physical downlink control channel (PDCCH) according to the first TCI state and a second PDCCH according to the second TCI state, wherein the first PDCCH schedules a reception of a first PDSCH and the second PDCCH schedules a reception of a second PDSCH; and the first PDSCH according to the first TCI state or the second PDSCH according to the second TCI state, wherein the transmitted first PDSCH or second PDSCH includes a random access response (RAR) message in response to the first PRACH reception or the second PRACH reception. ### Claim 19 (depends on 18) The base station of claim 18, wherein: the transceiver is further configured to receive a physical uplink shared channel (PUSCH) that is scheduled by information in the RAR message, and the PUSCH reception is according to the first TCI state when the RAR message is included in the first PDSCH or the second TCI state when the RAR message is included in the second PDSCH. ### Claim 20 (depends on 18) The base station of claim 18, wherein the transceiver is further configured to transmit the first PDCCH from a first antenna port and the second PDCCH from a second antenna port.