# US 11,452,144 B2 · Method and apparatus for random access configuration in a wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,144 B2 - Document ID: US11452144B2 - Status: Granted - Kind: B2 - Application number: 17/213,598 - Filed: 2021-03-26 - Published: 2021-07-15 - Granted: 2022-09-20 - Earliest claimed: 2017-08-18 - Assignees: ASUSTeK COMPUTER INC. - Applicants: ASUSTek Computer Inc. - Inventors: Meng-Hui Ou; Richard Lee-Chee Kuo; Tun-Huai Shih - Web page: https://patentgrep.com/patent/US11452144B2 ## CPC - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/002: {Transmission of channel access control information} - H04W 88/02: Terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method and apparatus are disclosed from the perspective of a User Equipment (UE), wherein the UE is configured with multiple Bandwidth Parts (BWPs). In one embodiment, the method includes the UE receiving information from a network node to associate a RACH (Random Access Channel) configuration with a BWP among the multiple BWPs. The method further includes that the UE performing a RACH transmission in the BWP using the RACH configuration associated with the BWP. ## Claims ### Claim 1 A method for a User Equipment (UE), wherein the UE is configured with multiple Bandwidth Parts (BWPs) in one component carrier, comprising: receiving information from a network node to associate a first RACH (Random Access Channel) configuration with a first BWP for at least one of the multiple BWPs of the one component carrier; determining whether there is a second RACH configuration associated with a currently active BWP after receiving the information; and selecting a RACH resource to perform a RACH transmission based upon whether a second RACH configuration is associated with the currently active BWP. ### Claim 2 (depends on 1) The method of claim 1, wherein the UE determines the second RACH configuration is associated with the currently active BWP if the second RACH configuration is included in a configuration of the currently active BWP. ### Claim 3 (depends on 1) The method of claim 1, wherein the information identifies the first RACH configuration. ### Claim 4 (depends on 1) The method of claim 1, wherein each RACH configuration is associated with one BWP among the multiple BWPs. ### Claim 5 (depends on 1) The method of claim 1, wherein the UE is configured with multiple RACH configurations. ### Claim 6 (depends on 1) The method of claim 1, wherein the UE performs an UL (Uplink) transmission on a PUSCH (Physical Uplink Shared Channel) in the currently active BWP. ### Claim 7 (depends on 1) The method of claim 1, further comprising: the UE receives a signalling from the network node to activate a BWP. ### Claim 8 (depends on 1) The method of claim 1, wherein the RACH transmission is a transmission of a random access preamble. ### Claim 9 A method for a network node, comprising: transmitting information to a User Equipment (UE) to associate a first Random Access Channel (RACH) configuration with a first Bandwidth Part (BWP) for at least one of multiple BWPs in one component carrier; receiving a RACH transmission in a currently active BWP from the UE according to a second RACH configuration if the second RACH configuration is associated with the currently active BWP; and receiving a RACH transmission in a second BWP which is not the currently active BWP if no RACH configuration is associated with the currently active BWP. ### Claim 10 (depends on 9) The method of claim 9, wherein the UE is configured with the multiple BWPs in the one component carrier and the BWP is among the multiple BWPs. ### Claim 11 (depends on 9) The method of claim 9, further comprising: the network node transmits a signalling to the UE to activate a BWP. ### Claim 12 (depends on 11) The method of claim 11, wherein the signalling is a Radio Resource Control (RRC) signalling, a Downlink Control Information (DCI) indicating a scheduling grant, or a MAC (Medium Access Control) control element. ### Claim 13 A User Equipment (UE), wherein the UE is configured with multiple Bandwidth Parts (BWPs) in one component carrier, comprising: a control circuit; a processor installed in the control circuit; and a memory installed in the control circuit and operatively coupled to the processor; wherein the processor is configured to execute a program code stored in the memory to: receive information from a network node to associate a first RACH (Random Access Channel) configuration with a first BWP for at least one of the multiple BWPs of the one component carrier; determine whether there is a second RACH configuration associated with a currently active BWP after receiving the information; and select a RACH resource to perform a RACH transmission based upon whether a second RACH configuration is associated with the currently active BWP. ### Claim 14 (depends on 13) The UE of claim 13, wherein the UE determines the second RACH configuration is associated with the currently active BWP if the information is included in a configuration of the currently active BWP. ### Claim 15 (depends on 13) The UE of claim 13, wherein the information identifies the first RACH configuration. ### Claim 16 (depends on 13) The UE of claim 13, wherein each RACH configuration is associated with one BWP among the multiple BWPs. ### Claim 17 (depends on 13) The UE of claim 13, wherein the UE is configured with multiple RACH configurations. ### Claim 18 (depends on 13) The UE of claim 13, wherein the UE performs an UL (Uplink) transmission on a PUSCH (Physical Uplink Shared Channel) in the currently active BWP. ### Claim 19 (depends on 13) The UE of claim 13, further comprising: the UE receives a signalling from the network node to activate a BWP. ### Claim 20 (depends on 13) The UE of claim 13, wherein the RACH transmission is a transmission of a random access preamble. ### Claim 21 A network node, comprising: a control circuit; a processor installed in the control circuit; and a memory installed in the control circuit and operatively coupled to the processor; wherein the processor is configured to execute a program code stored in the memory to: transmit information to a User Equipment (UE) to associate a first Random Access Channel (RACH) configuration with a first Bandwidth Part (BWP) for at least one of multiple BWPs in one component carrier; receive a RACH transmission in a currently active BWP from the UE according to a second RACH configuration if the second RACH configuration is associated with the currently active BWP; and receive a RACH transmission in a second BWP which is not the currently active BWP if no RACH configuration is associated with the currently active BWP. ### Claim 22 (depends on 21) The network node of claim 21, wherein the UE is configured with the multiple BWPs in the one component carrier and the BWP is among the multiple BWPs. ### Claim 23 (depends on 21) The network node of claim 21, further comprising: the network node transmits a signalling to the UE to activate a BWP. ### Claim 24 (depends on 23) The network node of claim 23, wherein the signalling is a Radio Resource Control (RRC) signalling, a Downlink Control Information (DCI) indicating a scheduling grant, or a MAC (Medium Access Control) control element.