# US 12,004,026 B2 · Method and apparatus for mobility procedure 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 12,004,026 B2 - Document ID: US12004026B2 - Status: Granted - Kind: B2 - Application number: 17/376,435 - Filed: 2021-07-15 - Published: 2022-01-27 - Granted: 2024-06-04 - Earliest claimed: 2020-07-24 - Assignees: ASUSTeK COMPUTER INC. - Applicants: ASUSTek Computer Inc. - Inventors: Yi-Hsuan Kung; Yu-Hsuan Guo - Web page: https://patentgrep.com/patent/US12004026B2 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 36/0077: {of access information of target access point} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0096: {Indication of changes in allocation} - H04W 36/0011: {for data sessions of end-to-end connection} - H04W 36/0072: {of resource information of target access point} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports} - H04W 36/085: {involving beams of 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 A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives, from a first cell, a first signaling indicative of a configuration of a Physical Downlink Control Channel (PDCCH) of a second cell. The UE receives, from the first cell, a second signaling indicative of switching a Special Cell (SpCell) of the UE to the second cell, wherein the second signaling includes a PDCCH signaling and/or a Medium Access Control (MAC) Control Element (CE). The UE monitors the PDCCH of the second cell in response to receiving the second signaling. ## Claims ### Claim 1 A method of a User Equipment (UE), the method comprising: receiving, from a first cell, a first signaling indicative of a configuration of a Physical Downlink Control Channel (PDCCH) of a second cell and a set of Transmission Configuration Indicator (TCI) states of the second cell; receiving, from the first cell, a Medium Access Control (MAC) Control Element (CE) indicative of (i) switching a Special Cell (SpCell) of the UE to the second cell, (ii) one or more TCI states of the set of TCI states indicated by the first signaling and (iii) timing advance (TA) information associated with the second cell to which the MAC CE is indicative switching the SpCell of the UE; and monitoring the PDCCH of the second cell, via the one or more TCI states indicated by the MAC CE and based on the configuration of the PDCCH indicated by the first signaling, in response to receiving the MAC CE indicative of switching the SpCell of the UE to the second cell. ### Claim 2 (depends on 1) The method of claim 1, comprising: triggering or generating a Channel State Information (CSI) report for transmission to the second cell in response to receiving the MAC CE. ### Claim 3 (depends on 1) The method of claim 1, wherein: the first signaling is indicative of at least one of a cell configuration of the second cell, an identity associated with the second cell, an index associated with the second cell, a Cell Radio Network Temporary Identifier (C-RNTI) for the UE and for the second cell, one or more uplink resources associated with the second cell, or a Scheduling Request (SR) configuration associated with the second cell. ### Claim 4 (depends on 3) The method of claim 3, comprising: triggering a SR associated with the SR configuration in response to receiving the MAC CE. ### Claim 5 (depends on 1) The method of claim 1, wherein: the MAC CE is indicative of at least one of an identity associated with the second cell, an index associated with the second cell, a Cell Radio Network Temporary Identifier (C-RNTI) for the UE and for the second cell, or one or more uplink resources associated with the second cell. ### Claim 6 (depends on 1) The method of claim 1, comprising: activating the one or more TCI states in response to receiving the MAC CE. ### Claim 7 (depends on 1) The method of claim 1, comprising: generating a Radio Resource Control (RRC) message for transmission to the second cell in response to receiving the MAC CE. ### Claim 8 (depends on 7) The method of claim 7, comprising: transmitting the RRC message via one or more uplink resources indicated by at least one of the first signaling or the MAC CE. ### Claim 9 (depends on 7) The method of claim 7, comprising: considering the second cell to be another SpCell in response to receiving the MAC CE or in response to transmitting the RRC message. ### Claim 10 (depends on 1) The method of claim 1, wherein: the one or more TCI states are for at least one of the PDCCH, a Physical Uplink Control Channel (PUCCH), a Physical Uplink Shared Channel (PUSCH) or a Physical Downlink Shared Channel (PDSCH). ### Claim 11 A User Equipment (UE), 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 perform operations, the operations comprising: receiving, from a first cell, a first signaling indicative of a configuration of a Physical Downlink Control Channel (PDCCH) of a second cell and a set of Transmission Configuration Indicator (TCI) states of the second cell; receiving, from the first cell, a Medium Access Control (MAC) Control Element (CE) indicative of (i) switching a Special Cell (SpCell) of the UE to the second cell, (ii) one or more TCI states of the set of TCI states indicated by the first signaling and (iii) timing advance (TA) information associated with the second cell to which the MAC CE is indicative switching the SpCell of the UE; and monitoring the PDCCH of the second cell, via the one or more TCI states indicated by the MAC CE and based on the configuration of the PDCCH indicated by the first signaling, in response to receiving the MAC CE indicative of switching the SpCell of the UE to the second cell. ### Claim 12 (depends on 11) The UE of claim 11, the operations comprising: triggering or generating a Channel State Information (CSI) report for transmission to the second cell in response to receiving the MAC CE. ### Claim 13 (depends on 11) The UE of claim 11, wherein: the first signaling is indicative of at least one of a cell configuration of the second cell, an identity associated with the second cell, an index associated with the second cell, a Cell Radio Network Temporary Identifier (C-RNTI) for the UE and for the second cell, one or more uplink resources associated with the second cell, or a Scheduling Request (SR) configuration associated with the second cell. ### Claim 14 (depends on 13) The UE of claim 13, the operations comprising: triggering a SR associated with the SR configuration in response to receiving the MAC CE. ### Claim 15 (depends on 11) The UE of claim 11, wherein: the MAC CE is indicative of at least one of an identity associated with the second cell, an index associated with the second cell, a Cell Radio Network Temporary Identifier (C-RNTI) for the UE and for the second cell, or one or more uplink resources associated with the second cell. ### Claim 16 (depends on 11) The UE of claim 11, the operations comprising: activating the one or more TCI states in response to receiving the MAC CE. ### Claim 17 (depends on 11) The UE of claim 11, the operations comprising: generating a Radio Resource Control (RRC) message for transmission to the second cell in response to receiving the MAC CE. ### Claim 18 (depends on 17) The UE of claim 17, the operations comprising: transmitting the RRC message via one or more uplink resources indicated by at least one of the first signaling or the MAC CE. ### Claim 19 (depends on 11) The UE of claim 11, the operations comprising: the one or more TCI states are for at least one of the PDCCH, a Physical Uplink Control Channel (PUCCH), a Physical Uplink Shared Channel (PUSCH) or a Physical Downlink Shared Channel (PDSCH). ### Claim 20 A non-transitory computer-readable medium comprising processor-executable instructions that when executed by a User Equipment (UE) cause performance of operations, the operations comprising: receiving, from a first cell, a first signaling indicative of a configuration of a Physical Downlink Control Channel (PDCCH) of a second cell and a set of Transmission Configuration Indicator (TCI) states of the second cell; receiving, from the first cell, a Medium Access Control (MAC) Control Element (CE) indicative of (i) switching a Special Cell (SpCell) of the UE to the second cell, (ii) one or more TCI states of the set of TCI states indicated by the first signaling and (iii) timing advance (TA) information associated with the second cell to which the MAC CE is indicative switching the SpCell of the UE; and monitoring the PDCCH of the second cell, via the one or more TCI states indicated by the MAC CE and based on the configuration of the PDCCH indicated by the first signaling, in response to receiving the MAC CE indicative of switching the SpCell of the UE to the second cell.