# US 12,016,051 B2 · Techniques for configuring random access transmissions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,016,051 B2 - Document ID: US12016051B2 - Status: Granted - Kind: B2 - Application number: 16/752,484 - Filed: 2020-01-24 - Published: 2020-08-06 - Granted: 2024-06-18 - Earliest claimed: 2019-02-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Ozcan Ozturk; Xiaoxia Zhang; Tao Luo; Muhammad Nazmul Islam; Jing Sun; Sony Akkarakaran - Web page: https://patentgrep.com/patent/US12016051B2 ## CPC - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 56/001: {Synchronization between nodes} - H04W 56/0045: {compensating for timing error by altering transmission time} - H04W 68/005: {Transmission of information for alerting of incoming communication} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 80/02: Data link layer protocols - H04W 74/002: {Transmission of channel access control information} - H04W 74/0836: with 2-step access - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods, systems, and devices for wireless communications are described. Examples may include receiving, at a user equipment (UE) a random access channel (RACH) configuration message from a base station, where the message indicates a channel metric (e.g., received signal strength indicator (RSSI), reference signal received power (RSRP), reference signal received quality (RSRQ), a signal-to-noise ratio (SNR), signal-to-interference-plus-noise ratio (SINR), or the like) and a threshold associated with the channel metric. The, UE may measure a reference signal (e.g., synchronization signal block (SSB), channel state information reference signal (CSI-RS), or the like) and select a RACH procedure based on comparing the measured channel metric to the threshold. For example, the UE may select a two-step RACH procedure if the measured channel metric satisfies the threshold specified in the configuration. In some cases, the UE may select a RACH procedure or a listen-before-talk (LBT) procedure based on a QoS parameter. ## Claims ### Claim 1 A method for wireless communications at a user equipment (UE), comprising: receiving a random access configuration message over a wireless channel, the random access configuration message indicating a channel metric and a threshold, wherein the random access configuration message comprises a timing advance; selecting a reference signal based at least in part on a received configuration message and based at least in part on at least one of the channel metric or the threshold; determining the channel metric based at least in part on receiving the random access configuration message, wherein determining the channel metric comprises receiving a measurement of the selected reference signal; selecting a first random access procedure from a plurality of random access procedures based at least in part on the channel metric and the threshold indicated in the random access configuration message, wherein selecting the first random access procedure comprises selecting a two-step random access procedure as the first random access procedure based at least in part on the timing advance; and establishing a connection with a network device by performing the first random access procedure. ### Claim 2 (depends on 1) The method of claim 1, wherein the reference signal comprises a synchronization signal block (SSB), and wherein the channel metric comprises a reference signal received power (RSRP). ### Claim 3 (depends on 1) The method of claim 1, wherein the reference signal comprises a channel state information reference signal (CSI-RS). ### Claim 4 (depends on 1) The method of claim 1, wherein the channel metric comprises one or more of: a received signal strength indicator (RSSI), reference signal received quality (RSRQ), a signal-to-noise ratio (SNR), or a signal-to-interference-plus-noise ratio (SINR). ### Claim 5 (depends on 1) The method of claim 1, wherein selecting the first random access procedure comprises: selecting between a two-step random access procedure and a four-step random access procedure based at least in part on comparing the channel metric to the threshold. ### Claim 6 (depends on 5) The method of claim 5, further comprising: selecting the two-step random access procedure if the channel metric satisfies the threshold. ### Claim 7 (depends on 5) The method of claim 5, further comprising: selecting the four-step random access procedure if the channel metric fails to satisfy the threshold. ### Claim 8 (depends on 1) The method of claim 1, wherein the random access configuration message comprises an indication of the timing advance. ### Claim 9 (depends on 1) The method of claim 1, wherein the random access configuration message is received during a connected mode and the timing advance is determined based at least in part on an uplink time. ### Claim 10 (depends on 1) The method of claim 1, wherein identifying the reference signal comprises: identifying the reference signal based at least in part on the random access configuration message, wherein the timing advance is estimated based at least in part on the reference signal. ### Claim 11 (depends on 1) The method of claim 1, further comprising: receiving a random access capability received from the network device; and determining a cell reselection priority based at least in part on the random access capability. ### Claim 12 (depends on 11) The method of claim 11, wherein the random access capability is received in a master information block (MIB) signal and the cell reselection priority is based at least in part on the random access capability indicating a two-step random access procedure. ### Claim 13 (depends on 1) The method of claim 1, wherein selecting the first random access procedure from the plurality of random access procedures is based at least in part on a quality of a service parameter, the quality of the service parameter indicative of a priority level associated with data transmission between the UE and the network device. ### Claim 14 (depends on 1) The method of claim 1, wherein selecting the first random access procedure from the plurality of random access procedures is based at least in part on a priority level associated with data to be transmitted from the network device to the UE. ### Claim 15 (depends on 1) The method of claim 1, wherein selecting the first random access procedure from the plurality of random access procedures is based at least in part on a type of control information to be transmitted between the UE and the network device. ### Claim 16 (depends on 1) The method of claim 1, further comprising: performing a cell selection or reselection based at least in part on a priority level associated with the first random access procedure, the priority level based at least in part on receiving a random access capability associated with the network device. ### Claim 17 A method for wireless communications at a user equipment (UE), comprising: receiving a control message from a network device, the control message specifying for the UE to use a first random access procedure from a plurality of random access procedures to configure a random access message, the plurality of random access procedures comprising a two-step random access procedure and a four-step random access procedure; identifying a listen before talk (LBT) procedure based at least in part on the first random access procedure specified in the control message and a procedure for which the first random access procedure is used, the procedure comprising a beam failure recovery, a handover completion, a system information, or a combination thereof; configuring the LBT procedure to be performed prior to transmitting the random access message; and establishing a connection with the network device by performing the first random access procedure. ### Claim 18 (depends on 17) The method of claim 17, wherein the control message comprises one or more or: a paging message, physical downlink control channel (PDCCH) message, media access control (MAC) control element, or radio resource control (RRC) signaling. ### Claim 19 An apparatus for wireless communications at a user equipment (UE), comprising: a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive a random access configuration message over a wireless channel, the random access configuration message indicating a channel metric and a threshold, wherein the random access configuration message comprises a timing advance; select a reference signal based at least in part on a received configuration message and based at least in part on at least one of the channel metric or the threshold; determine the channel metric based at least in part on receiving the random access configuration message, wherein determining the channel metric comprises receiving a measurement of the selected reference signal; select a first random access procedure from a plurality of random access procedures based at least in part on the channel metric and the threshold indicated in the random access configuration message, wherein selecting the first random access procedure comprises selecting a two-step random access procedure as the first random access procedure based at least in part on the timing advance; and establish a connection with a network device by performing the first random access procedure. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the reference signal comprises one or more of: a synchronization signal block (SSB) or channel state information reference signal (CSI-RS), and wherein the channel metric comprises one or more of: a received signal strength indicator (RSSI), reference signal received power (RSRP), reference signal received quality (RSRQ), a signal-to-noise ratio (SNR), or a signal-to-interference-plus-noise ratio (SINR). ### Claim 21 (depends on 19) The apparatus of claim 19, wherein the instructions to select the first random access procedure are executable by the processor to cause the apparatus to: select between a two-step random access procedure and a four-step random access procedure based at least in part on comparing the channel metric to the threshold; select the two-step random access procedure if the channel metric satisfies the threshold; and select the four-step random access procedure if the channel metric fails to satisfy the threshold. ### Claim 22 (depends on 19) The apparatus of claim 19, wherein the random access configuration message comprises an indication of the timing advance. ### Claim 23 (depends on 19) The apparatus of claim 19, wherein the instructions are further executable by the processor to cause the apparatus to: receive a random access capability received from the network device; and determine a cell reselection priority based at least in part on the random access capability, wherein the random access capability is received in a master information block (MIB) signal and the cell reselection priority is based at least in part on the random access capability indicating a two-step random access procedure. ### Claim 24 An apparatus for wireless communications at a user equipment (UE), comprising: a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive a control message from a network device, the control message specifying for the UE to use a first random access procedure from a plurality of random access procedures to configure a random access message, the plurality of random access procedures comprising a two-step random access procedure and a four-step random access procedure; identify a listen before talk (LBT) procedure based at least in part on the first random access procedure specified in the control message and a procedure for which the first random access procedure is used, the procedure comprising a beam failure recovery, a handover completion, a system information, or a combination thereof; configure the LBT procedure to be performed prior to transmitting the random access message; and establish a connection with the network device by performing the first random access procedure. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the control message comprises one or more or: comprises a paging message, physical downlink control channel (PDCCH) message, media access control (MAC) control element, or radio resource control (RRC) signaling. ### Claim 26 (depends on 24) The apparatus of claim 24, wherein the LBT procedure is configured based at least in part on a priority associated with the first random access procedure.