# US 12,004,225 B2 · Initial access random access occasion-caused interference > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,225 B2 - Document ID: US12004225B2 - Status: Granted - Kind: B2 - Application number: 17/570,873 - Filed: 2022-01-07 - Published: 2023-07-13 - Granted: 2024-06-04 - Earliest claimed: 2022-01-07 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Yan Zhou; Qian Zhang; Navid Abedini; Junyi Li; Tao Luo - Web page: https://patentgrep.com/patent/US12004225B2 ## CPC - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/1461: {Suppression of signals in the return path, i.e. bidirectional control circuits} - H04L 5/16: Half-duplex systems; Simplex/duplex switching; Transmission of break signals {non-automatically inverting the direction of transmission} - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points - 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 Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an indication of a plurality of random access occasions for uplink message transmission to a base station. The UE may determine that a first portion of the plurality of random access occasions is unavailable for use by the UE as a result of the base station operating in a full duplex mode. The UE may select one or more random access occasions from a second portion of the plurality of random access occasions instead of from the first portion based at least in part on the determining. The UE may transmit a random access message to the base station during the one or more random access occasions from the second portion. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving an indication of a plurality of random access occasions for uplink message transmission to a base station; determining that a first portion of the plurality of random access occasions is unavailable for use by the UE as a result of the base station operating in a full duplex mode; selecting one or more random access occasions from a second portion of the plurality of random access occasions instead of from the first portion based at least in part on the determining; and transmitting a random access message to the base station during the one or more random access occasions from the second portion. ### Claim 2 (depends on 1) The method of claim 1, wherein determining that the first portion of the plurality of random access occasions is unavailable further comprises: monitoring for an interference level associated with a second UE transmitting an uplink message to the base station, wherein the monitoring occurs prior to the plurality of random access occasions. ### Claim 3 (depends on 2) The method of claim 2, wherein monitoring the interference level comprises: monitoring one or more uplink feedback transmissions from the second UE to the base station; and determining the interference level based at least in part on the monitoring. ### Claim 4 (depends on 3) The method of claim 3, wherein determining that the first portion of the plurality of random access occasions is unavailable further comprises: selecting the one or more random access occasions from the second portion of the plurality of random access occasions based at least in part on the interference level satisfying an interference threshold. ### Claim 5 (depends on 3) The method of claim 3, wherein the first portion of the plurality of random access occasions comprises full-duplex random access occasions and the second portion of the plurality of random access occasions comprises half-duplex random access occasions or the second portion of the plurality of random access occasions comprises the full-duplex random access occasions and the half-duplex random access occasions. ### Claim 6 (depends on 2) The method of claim 2, wherein monitoring the interference level comprises: receiving an indication of a transmission power of the uplink message transmitted by the second UE; determining a pathloss for a channel between the UE and the second UE based at least in part on the uplink message from the second UE to the base station; and identifying the interference level based at least in part on the pathloss. ### Claim 7 (depends on 2) The method of claim 2, wherein monitoring for the interference level comprises: determining a first interference level for a first set of random access occasions of the plurality of random access occasions, wherein the first set of random access occasions is within a first subband; and determining a second interference level for a second set of random access occasions of the plurality of random access occasions, wherein the second set of random access occasions is within a second subband, wherein selecting the one or more random access occasions from the second portion of the plurality of random access occasions is based at least in part on at least one of the first interference level or the second interference level, and an interference threshold. ### Claim 8 (depends on 7) The method of claim 7, wherein determining that the first portion of the plurality of random access occasions is unavailable for use by the UE further comprises: identifying a highest total received signal strength indication (RSSI) per uplink symbol among all uplink symbols within both the first subband and the second subband; comparing the highest total RSSI per uplink symbol from each of the first subband and the second subband with the interference threshold; and determining whether the first set of random access occasions, the second set of random access occasions, or both, is unavailable as the first portion of the plurality of random access occasions or is available as the second portion of the plurality of random access occasions based at least in part on the comparing. ### Claim 9 (depends on 1) The method of claim 1, wherein determining that the first portion of the plurality of random access occasions is unavailable further comprises: monitoring each of the plurality of random access occasions for an interference level, wherein the plurality of random access occasions are full-duplex random access occasions. ### Claim 10 (depends on 9) The method of claim 9, wherein the monitoring of each of the plurality of random access occasions for the interference level comprises: monitoring for a reference signal from the base station, wherein the first portion of random access occasions have interference levels based on detection of the reference signal during the first portion of random access occasions, and wherein the second portion of random access occasions have interference levels based on a lack of detection of the reference signal during the second portion of random access occasions. ### Claim 11 (depends on 9) The method of claim 9, wherein: the first portion of random access occasions have interference levels above an interference level threshold, and the second portion of random access occasions have interference levels below the interference level threshold. ### Claim 12 (depends on 1) The method of claim 1, wherein determining that the first portion of the plurality of random access occasions is unavailable further comprises: receiving a system information message from the base station indicating, for each random access occasion in the plurality of random access occasions, whether the random access occasion is included in the first portion of the plurality of random access occasions as unavailable or included in the second portion of the plurality of random access occasions as available. ### Claim 13 A method for wireless communication at a base station, comprising: transmitting an indication of a plurality of random access occasions for an uplink message transmission from a user equipment (UE) to the base station; and receiving a random access message from the UE during one or more random access occasions from a second portion of the plurality of random access occasions instead of from a first portion of the plurality of random access occasions, wherein the first portion of the plurality of random access occasions is unavailable for use by the UE as a result of the base station operating in a full duplex mode. ### Claim 14 (depends on 13) The method of claim 13, further comprising: receiving one or more uplink feedback transmissions from a second UE, wherein the first portion of the plurality of random access occasions is unavailable for use by the UE based at least in part on an interference level associated with the one or more uplink feedback transmissions satisfying an interference threshold, wherein the one or more uplink feedback transmissions from the second UE occur prior to the plurality of random access occasions. ### Claim 15 (depends on 14) The method of claim 14, further comprising: transmitting, to the UE, an indication of a transmission power of the one or more uplink feedback transmissions performed by the second UE. ### Claim 16 (depends on 13) The method of claim 13, wherein the first portion of the plurality of random access occasions comprises full-duplex random access occasions and the second portion of the plurality of random access occasions comprises half-duplex random access occasions or the second portion of the plurality of random access occasions comprise the full-duplex random access occasions and the half-duplex random access occasions. ### Claim 17 (depends on 13) The method of claim 13, further comprising: identifying a downlink transmission from the base station that overlaps in a time domain with a random access occasion of the plurality of random access occasions; and transmitting a reference signal accompanying the downlink transmission, wherein the plurality of random access occasions are full-duplex random access occasions. ### Claim 18 (depends on 13) The method of claim 13, further comprising: identifying one or more downlink transmissions from the base station that overlap in a time domain with a corresponding random access occasion of the plurality of random access occasions; and transmitting a system information message to the UE indicating, for each random access occasion in the plurality of random access occasions, whether the random access occasion is included in the first portion of the plurality of random access occasions as unavailable or included in the second portion of the random access occasions as available based at least in part on the overlap. ### Claim 19 An apparatus for wireless communication at a user equipment (UE), comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive an indication of a plurality of random access occasions for uplink message transmission to a base station; determine that a first portion of the plurality of random access occasions is unavailable for use by the UE as a result of the base station operating in a full duplex mode; select one or more random access occasions from a second portion of the plurality of random access occasions instead of from the first portion based at least in part on the determining; and transmit a random access message to the base station during the one or more random access occasions from the second portion. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the instructions to determine that the first portion of the plurality of random access occasions is unavailable are further executable by the processor to cause the apparatus to: monitor for an interference level associated with a second UE transmitting an uplink message to the base station, wherein the monitoring occurs prior to the plurality of random access occasions. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the instructions to monitor the interference level are executable by the processor to cause the apparatus to: monitor one or more uplink feedback transmissions from the second UE to the base station; and determine the interference level based at least in part on the monitoring. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the instructions to determine that the first portion of the plurality of random access occasions is unavailable are further executable by the processor to cause the apparatus to: select the one or more random access occasions from the second portion of the plurality of random access occasions based at least in part on the interference level satisfying an interference threshold. ### Claim 23 (depends on 21) The apparatus of claim 21, wherein the first portion of the plurality of random access occasions comprises full-duplex random access occasions and the second portion of the plurality of random access occasions comprises half-duplex random access occasions or the second portion of the plurality of random access occasions comprises the full-duplex random access occasions and the half-duplex random access occasions. ### Claim 24 (depends on 20) The apparatus of claim 20, wherein the instructions to monitor the interference level are executable by the processor to cause the apparatus to: receive an indication of a transmission power of the uplink message transmitted by the second UE; determine a pathloss for a channel between the UE and the second UE based at least in part on the uplink message from the second UE to the base station; and identify the interference level based at least in part on the pathloss. ### Claim 25 (depends on 20) The apparatus of claim 20, wherein the instructions to monitor for the interference level are executable by the processor to cause the apparatus to: determine a first interference level for a first set of random access occasions of the plurality of random access occasions, wherein the first set of random access occasions is within a first subband; and determine a second interference level for a second set of random access occasions of the plurality of random access occasions, wherein the second set of random access occasions is within a second subband, wherein selecting the one or more random access occasions from the second portion of the plurality of random access occasions is based at least in part on at least one of the first interference level or the second interference level, and an interference threshold. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the instructions to determine that the first portion of the plurality of random access occasions is unavailable for use by the UE are further executable by the processor to cause the apparatus to: identify a highest total received signal strength indication (RSSI) per uplink symbol among all uplink symbols within both the first subband and the second subband; compare the highest total RSSI per uplink symbol from each of the first subband and the second subband with the interference threshold; and determine whether the first set of random access occasions, the second set of random access occasions, or both, is unavailable as the first portion of the plurality of random access occasions or is available as the second portion of the plurality of random access occasions based at least in part on the comparing. ### Claim 27 (depends on 19) The apparatus of claim 19, wherein the instructions to determine that the first portion of the plurality of random access occasions is unavailable are further executable by the processor to cause the apparatus to: monitor each of the plurality of random access occasions for an interference level, wherein the plurality of random access occasions are full-duplex random access occasions. ### Claim 28 (depends on 27) The apparatus of claim 27, wherein the instructions to monitor of each of the plurality of random access occasions for the interference level are executable by the processor to cause the apparatus to: monitor for a reference signal from the base station, wherein the first portion of random access occasions have interference levels based on detection of the reference signal during the first portion of random access occasions, and wherein the second portion of random access occasions have interference levels based on a lack of detection of the reference signal during the second portion of random access occasions. ### Claim 29 (depends on 27) The apparatus of claim 27, wherein: the first portion of random access occasions have interference levels above an interference level threshold, and the second portion of random access occasions have interference levels below the interference level threshold. ### Claim 30 An apparatus for wireless communication at a base station, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit an indication of a plurality of random access occasions for an uplink message transmission from a user equipment (UE) to the base station; and receive a random access message from the UE during one or more random access occasions from a second portion of the plurality of random access occasions instead of from a first portion of the plurality of random access occasions, wherein the first portion of the plurality of random access occasions is unavailable for use by the UE as a result of the base station operating in a full duplex mode.