# US 2023/0056461 A1 · Random Access Method and Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0056461 A1 - Document ID: US20230056461A1 - Status: Published application - Kind: A1 - Application number: 17/982,988 - Filed: 2022-11-08 - Published: 2023-02-23 - Earliest claimed: 2017-11-15 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Haibo Xu; Yiru Kuang; Zhenzhen Cao; Jian Wang; Xuelong Wang - Web page: https://patentgrep.com/patent/US20230056461A1 ## CPC - H04W 76/27: Transitions between radio resource control [RRC] states - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0092: {Indication of how the channel is divided} - H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 74/02: Hybrid access - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 5/001: {the frequencies being arranged in component carriers} - H04W 36/0064: {of control information between different access points} - H04W 36/0069: {in case of dual connectivity, e.g. decoupled uplink/downlink} - H04W 36/0077: {of access information of target access point} - H04W 74/0838: using contention-free random access [CFRA] - H04W 76/15: Setup of multiple wireless link connections - 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 A random access method and device. The method includes receiving, by user equipment, a radio resource control (RRC) connection reconfiguration message from a first network device, the RRC connection reconfiguration message indicating a primary serving cell of the second network device for a user equipment, an active uplink bandwidth part (BWP) in the primary serving cell, and an active downlink BWP in the primary serving cell, the RRC connection reconfiguration message includes an uplink BWP identifier indicating the active uplink BWP and a downlink BWP identifier indicating the active downlink BWP, the uplink BWP identifier corresponds to the active uplink BWP, the downlink BWP identifier corresponds to the active downlink BWP, and initiating, by the user equipment, a random access procedure to the second network device on the active uplink BWP and the active downlink BWP. ## Claims ### Claim 1 A random access method, comprising: receiving, by user equipment, a radio resource control (RRC) connection reconfiguration message from a first network device, wherein the RRC connection reconfiguration message indicates a primary serving cell of a second network device for a user equipment, further indicates an active uplink bandwidth part (BWP) in the primary serving cell, and further indicates an active downlink BWP in the primary serving cell, wherein the RRC connection reconfiguration message includes an uplink BWP identifier indicating the active uplink BWP in the primary serving cell and further includes a downlink BWP identifier indicating the active downlink BWP in the primary serving cell, wherein the uplink BWP identifier corresponds to the active uplink BWP, wherein the downlink BWP identifier corresponds to the active downlink BWP, and wherein the active uplink BWP and the active downlink BWP are BWPs among BWPs configured for the user equipment; and initiating, by the user equipment, a random access procedure to the second network device on the active uplink BWP and the active downlink BWP. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first network device is a source network device, wherein the second network device is a target network device, and wherein the first message is a handover request acknowledgment message. ### Claim 3 (depends on 1) The method according to claim 1, wherein the first network device is a primary network device node, wherein the second network device is a secondary network device node, and wherein the first message is a secondary node addition request acknowledgment message. ### Claim 4 (depends on 1) The method according to claim 1, wherein the random access procedure is triggered by the RRC connection reconfiguration message. ### Claim 5 (depends on 1) The method according to claim 1, wherein neither the activate uplink BWP and the activate downlink BWP are each a BWP other than an initial BWP. ### Claim 6 A user equipment, comprising: a receiver, a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for: receiving, by user equipment, a radio resource control (RRC) connection reconfiguration message from a first network device, wherein the RRC connection reconfiguration message indicates a primary serving cell of a second network device for a user equipment, further indicates an active uplink bandwidth part (BWP) in the primary serving cell, and further indicates an active downlink BWP in the primary serving cell, wherein the RRC connection reconfiguration message includes an uplink BWP identifier indicating the active uplink BWP in the primary serving cell and further includes a downlink BWP identifier indicating the active downlink BWP in the primary serving cell, wherein the uplink BWP identifier corresponds to the active uplink BWP, wherein the downlink BWP identifier corresponds to the active downlink BWP, and wherein the active uplink BWP and the active downlink BWP are BWPs among BWPs configured for the user equipment; and initiating, by the user equipment, a random access procedure to the second network device on the active uplink BWP and the active downlink BWP. ### Claim 7 (depends on 6) The user equipment according to claim 6, wherein the first network device is a source network device, wherein the second network device is a target network device, and wherein the first message is a handover request acknowledgment message. ### Claim 8 (depends on 6) The user equipment according to claim 6, wherein the first network device is a primary network device node, wherein the second network device is a secondary network device node, and wherein the first message is a secondary node addition request acknowledgment message. ### Claim 9 (depends on 6) The user equipment according to claim 6, wherein the random access procedure is triggered by the RRC connection reconfiguration message. ### Claim 10 (depends on 6) The user equipment according to claim 6, wherein the activate uplink BWP and the activate downlink BWP are each a BWP other than an initial BWP. ### Claim 11 A chip, comprising: a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for: receiving, by user equipment, a radio resource control (RRC), connection reconfiguration message from a first network device, wherein the RRC connection reconfiguration message indicates a primary serving cell of a second network device for a user equipment, further indicates an active uplink bandwidth part (BWP) in the primary serving cell, and further indicates an active downlink BWP in the primary serving cell, wherein the RRC connection reconfiguration message includes an uplink BWP identifier indicating the active uplink BWP in the primary serving cell and further includes a downlink BWP identifier indicating the active downlink BWP in the primary serving cell, wherein the uplink BWP identifier corresponds to the active uplink BWP, wherein the downlink BWP identifier corresponds to the active downlink BWP, and wherein the active uplink BWP and the active downlink BWP are BWPs among BWPs configured for the user equipment; and initiating, by the user equipment, a random access procedure to the second network device on the active uplink BWP and the active downlink BWP. ### Claim 12 (depends on 11) The chip according to claim 11, wherein the first network device is a source network device, wherein the second network device is a target network device, and wherein the first message is a handover request acknowledgment message. ### Claim 13 (depends on 11) The chip according to claim 11, wherein the first network device is a primary network device node, wherein the second network device is a secondary network device node, and wherein the first message is a secondary node addition request acknowledgment message. ### Claim 14 (depends on 11) The chip according to claim 11, wherein the random access procedure is triggered by the RRC connection reconfiguration message. ### Claim 15 (depends on 11) The chip according to claim 11, wherein the activate uplink BWP and the activate downlink BWP are each a BWP other than an initial BWP. ### Claim 16 (depends on 1) The method of claim 1, wherein the initiating the random access procedure to the second network device comprises sending, by the user equipment to the second network device, a random access preamble on the active uplink BWP. ### Claim 17 (depends on 16) The method of claim 16, wherein the initiating the random access procedure to the second network device further comprises receiving, by the user equipment, from the second network device, a random access response (RAR) on the active downlink BWP. ### Claim 18 (depends on 6) The user equipment of claim 6, wherein the instructions for initiating the random access procedure to the second network device include instructions for sending, to the second network device, a random access preamble on the active uplink BWP. ### Claim 19 (depends on 18) The user equipment of claim 18, wherein the instructions for initiating the random access procedure to the second network device further include instructions for receiving, from the second network device, a random access response (RAR) on the active downlink BWP. ### Claim 20 (depends on 11) The chip of claim 11, wherein the instructions for initiating the random access procedure to the second network device include instructions for sending, to the second network device, a random access preamble on the active uplink BWP, and for receiving, from the second network device, a random access response (RAR) on the active downlink BWP.