# US 2025/0220771 A1 · Method and apparatus for terminal in rrc_inactive to perform system information update in mobile 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 2025/0220771 A1 - Document ID: US20250220771A1 - Status: Published application - Kind: A1 - Application number: 19/084,193 - Filed: 2025-03-19 - Published: 2025-07-03 - Earliest claimed: 2021-10-18 - Assignees: Soenghun Kim; Blackpin Inc. - Applicants: Blackpin Inc. - Inventors: Soenghun Kim - Web page: https://patentgrep.com/patent/US20250220771A1 ## CPC - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04W 68/005: {Transmission of information for alerting of incoming communication} - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method and apparatus for monitoring paging in a mobile communication system are provided. Method for monitoring paging includes receiving a first message including first paging cycle and second paging cycle from the AMF, receiving a second message including third paging cycle and fourth paging cycle from the base station, receiving a system information including an information related to the support of extended DRX, determining a reference DRX cycle, monitoring paging occasion based on the reference DRX cycle and receiving a short message. ## Claims ### Claim 1 A method by a base station in a wireless communication system, the method comprising: receiving from an Access Mobility Function (AMF) a first message comprising a parameter for an extended discontinuous reception (DRX) cycle; receiving from a base station a system information block1 (SIB1), wherein the SIB1 comprises: a parameter for modification period; and a parameter indicating extended DRX is allowed; determining a paging frame based on the extended DRX cycle; monitoring a paging occasion in the paging frame; and receiving from the base station a second message, wherein the second message comprises: a first bit related to system information modification; and a second bit related to system information modification, wherein a system information acquisition procedure is started at a first time point in case that: the first bit in the second message is set to 1; and the terminal does not operate with extended DRX cycle longer than a modification period, and wherein the system information acquisition procedure is started at a second time point in case that: the second bit in the second message is set to 1; and the terminal operates with extended DRX cycle longer than the modification period. ### Claim 2 (depends on 1) The method of claim 1, wherein: the modification period is equal to product of a default paging cycle and an integer; the integer is determined based on the parameter for modification period; and the default paging cycle is indicated in the SIB1. ### Claim 3 (depends on 1) The method of claim 1, wherein: the system information acquisition procedure is not started in case that: the first bit in the second message is set to 1; the second bit in the second message is set to 0; and the terminal operates with the extended DRX cycle longer than the modification period. ### Claim 4 (depends on 1) The method of claim 1, wherein: the system information acquisition procedure is not initiated in case that: the first bit in the second message is set to 0; the second bit in the second message is set to 1; and the terminal operates with the extended DRX cycle shorter than the modification period. ### Claim 5 (depends on 1) The method of claim 1, wherein: the first time point is determined based on next modification period; and the second time point is determined based on next extended DRX acquisition cycle. ### Claim 6 (depends on 1) The method of claim 1, wherein, in case that the system information acquisition procedure is started, the terminal: applies a specific broadcast control channel configuration; acquires a master information block; acquires the SIB1 based on the master information block; acquires a first system information (SI) based on the SIB1; and request a second SI based on the SIB1. ### Claim 7 (depends on 6) The method of claim 6, wherein the master information block comprises information that is used for the terminal to determine time/frequency resource for SIB1 reception. ### Claim 8 (depends on 7) The method of claim 7, wherein the SIB1 comprises: a parameter for mapping between one or more SIBs and the first SI; and a parameter for mapping between one or more SIBs and the second SI. ### Claim 9 (depends on 8) The method of claim 8, wherein the SIB1 further comprises: a parameter indicating that the first SI is broadcasting; and a parameter indicating that the second SI is not broadcasting. ### Claim 10 (depends on 1) The method of claim 1, wherein the paging frame is further determined based on: a parameter for paging frame offset; and a parameter for division operation. ### Claim 11 (depends on 10) The method of claim 10, wherein the parameter for paging frame offset and the parameter for division operation are comprised in the SIB1. ### Claim 12 (depends on 1) The method of claim 1, wherein: the second message further comprises a third bit related to monitoring paging; and the terminal stop monitoring paging in a specific paging occasion. ### Claim 13 A terminal in a wireless communication system, the terminal comprising: a transceiver configured to transmit and receive a signal; and a controller configured to control the transceiver to: receive from an Access Mobility Function (AMF) a first message comprising a parameter for an extended discontinuous reception (DRX) cycle, receive from a base station a system information block1 (SIB1), wherein the SIB1 comprises: a parameter for modification period; and a parameter indicating extended DRX is allowed, determine a paging frame based on the extended DRX cycle, monitor a paging occasion in the paging frame, and receive from the base station a second message, wherein the second message comprises: a first bit related to system information modification; and a second bit related to system information modification, wherein a system information acquisition procedure is started at a first time point in case that: the first bit in the second message is set to 1; and the terminal does not operate with extended DRX cycle longer than a modification period, and wherein the system information acquisition procedure is started at a second time point in case that: the second bit in the second message is set to 1; and the terminal operates with extended DRX cycle longer than the modification period.