# US 11,910,450 B2 · Resetting MAC layer in two-step random-access procedures > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,450 B2 - Document ID: US11910450B2 - Status: Granted - Kind: B2 - Application number: 17/831,804 - Filed: 2022-06-03 - Published: 2022-09-15 - Granted: 2024-02-20 - Earliest claimed: 2019-01-04 - Assignees: Beijing Xiaomi Mobile Software Co., Ltd. - Applicants: Beijing Xiaomi Mobile Software Co., Ltd. - Inventors: Ali Cagatay Cirik; Esmael Hejazi Dinan; Hua Zhou; Hyoungsuk Jeon; Alireza Babaei; Kyungmin Park; Kai Xu - Web page: https://patentgrep.com/patent/US11910450B2 ## CPC - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04W 74/0841: {with collision treatment} - H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/02: Hybrid access - H04W 74/0816: with collision avoidance - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A wireless device receives one or more configuration parameters indicating a physical uplink shared channel (PUSCH) resource for transmission of a message A (MsgA) payload of a contention-free two-step random-access procedure. The wireless device receives, from a radio resource control (RRC) layer of the wireless device, a request to reset a medium access control (MAC) layer of the wireless device. In response to the request and based on the configuration parameter indicating the PUSCH resource, the PUSCH resource for the MsgA transmission of the contention-free two-step random-access procedure is cleared. ## Claims ### Claim 1 A method comprising: receiving, by a wireless device, one or more configuration parameters indicating a physical uplink shared channel (PUSCH) resource for transmission of a message A (MsgA) payload of a contention-free two-step random-access procedure; receiving, from a radio resource control (RRC) layer of the wireless device, a request to reset a medium access control (MAC) layer of the wireless device; and in response to the request and based on the one or more configuration parameters indicating the PUSCH resource for the MsgA transmission, clearing the PUSCH resource of the contention-free two-step random-access procedure. ### Claim 2 (depends on 1) The method of claim 1, wherein the one or more configuration parameters are for the contention-free two-step random-access procedure of an unlicensed cell, and wherein the contention-free two-step random-access procedure is not initiated for a beam failure recovery procedure of the unlicensed cell. ### Claim 3 (depends on 1) The method of claim 1, wherein the clearing the PUSCH resource comprises stopping transmitting, via the PUSCH resource, the MsgA payload. ### Claim 4 (depends on 1) The method of claim 1, wherein the one or more configuration parameters further indicate one or more uplink grants associated with the PUSCH resource, and wherein the clearing the PUSCH resource comprises: not transmitting, via an uplink grant of the one or more uplink grants, the MsgA payload; or stopping transmitting, via the uplink grant, the MsgA payload. ### Claim 5 (depends on 1) The method of claim 1, wherein the clearing the PUSCH resource comprises releasing a configuration of the PUSCH resource. ### Claim 6 (depends on 1) The method of claim 1, wherein the PUSCH resource comprises one or more random-access channel (RACH) resources, and wherein the clearing the PUSCH resource comprises discarding the one or more RACH resources. ### Claim 7 (depends on 6) The method of claim 6, wherein a RACH resource of the one or more RACH resources comprises: a RACH occasion; and a preamble that is transmitted via the RACH occasion. ### Claim 8 (depends on 7) The method of claim 7, wherein the one or more configuration parameters further indicate the RACH resource is mapped to an uplink grant, and wherein the RACH resource being mapped to the uplink grant comprises: the RACH occasion being mapped to the uplink grant; or the preamble being mapped to the uplink grant. ### Claim 9 (depends on 1) The method of claim 1, wherein the one or more configuration parameters are received in one or more RRC messages. ### Claim 10 (depends on 1) The method of claim 1, wherein the resetting the MAC layer comprises resetting a MAC entity of the wireless device. ### Claim 11 A wireless device comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to: receive one or more configuration parameters indicating a physical uplink shared channel (PUSCH) resource for transmission of a message A (MsgA) payload of a contention-free two-step random-access procedure; receive, from a radio resource control (RRC) layer of the wireless device, a request to reset a medium access control (MAC) layer of the wireless device; and in response to the request and based on the one or more configuration parameters indicating the PUSCH resource for the MsgA transmission, clear the PUSCH resource of the contention-free two-step random-access procedure. ### Claim 12 (depends on 11) The wireless device of claim 11, wherein the one or more configuration parameters are for the contention-free two-step random-access procedure of an unlicensed cell, and wherein the contention-free two-step random-access procedure is not initiated for a beam failure recovery procedure of the unlicensed cell. ### Claim 13 (depends on 11) The wireless device of claim 11, wherein to clear the PUSCH resource, the instructions, when executed by the one or more processors, further cause the wireless device to stop transmitting, via the PUSCH resource, the MsgA payload. ### Claim 14 (depends on 11) The wireless device of claim 11, wherein the one or more configuration parameters further indicate one or more uplink grants associated with the PUSCH resource, and wherein to clear the PUSCH resource, the instructions, when executed by the one or more processors, further cause the wireless device to: not transmit, via an uplink grant of the one or more uplink grants, the MsgA payload; or stop transmitting, via the uplink grant, the MsgA payload. ### Claim 15 (depends on 11) The wireless device of claim 11, wherein to clear the PUSCH resource, the instructions, when executed by the one or more processors, further cause the wireless device to release a configuration of the PUSCH resource. ### Claim 16 (depends on 11) The wireless device of claim 11, wherein the PUSCH resource comprises one or more random-access channel (RACH) resources, and wherein to clear the PUSCH resource, the instructions, when executed by the one or more processors, further cause the wireless device to discard the one or more RACH resources. ### Claim 17 (depends on 16) The wireless device of claim 16, wherein a RACH resource of the one or more RACH resources comprises: a RACH occasion, and a preamble that is transmitted via the RACH occasion; wherein the one or more configuration parameters further indicate the RACH resource is mapped to an uplink grant, and wherein the RACH resource being mapped to the uplink grant comprises: the RACH occasion being mapped to the uplink grant, or the preamble being mapped to the uplink grant. ### Claim 18 (depends on 11) The wireless device of claim 11, wherein the one or more configuration parameters are received in one or more RRC messages. ### Claim 19 (depends on 11) The wireless device of claim 11, wherein reset the MAC layer, the instructions, when executed by the one or more processors, further cause the wireless device to reset a MAC entity of the wireless device. ### Claim 20 A system comprising: a base station comprising one or more first processors and first memory storing first instructions that, when executed by the one or more first processors, cause the base station to: transmit one or more configuration parameters indicating a physical uplink shared channel (PUSCH) resource for transmission of a message A (MsgA) payload of a contention-free two-step random-access procedure; and a wireless device comprising one or more second processors and second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to: receive the one or more configuration parameters indicating the PUSCH resource for transmission of the MsgA payload of the contention-free two-step random-access procedure; receive, from a radio resource control (RRC) layer of the wireless device, a request to reset a medium access control (MAC) layer of the wireless device; and in response to the request and based on the one or more configuration parameters indicating the PUSCH resource for the MsgA transmission, clear the PUSCH resource of the contention-free two-step random-access procedure.