# US 10,771,931 B2 · Method and apparatus for requesting SIB in 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 10,771,931 B2 - Document ID: US10771931B2 - Status: Granted - Kind: B2 - Application number: 16/300,216 - Filed: 2017-05-10 - Published: 2019-05-23 - Granted: 2020-09-08 - Earliest claimed: 2016-05-10 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Youngdae Lee; Sangwon Kim; Jaewook Lee - Web page: https://patentgrep.com/patent/US10771931B2 ## CPC - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04L 1/1614: {using bitmaps} - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 36/249: {according to timing information} - H04W 48/14: using user query {or user detection} - H04W 68/02: Arrangements for increasing efficiency of notification or paging channel - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - 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 Provided are a method for a terminal for requesting a system information block (SIB), and an apparatus for supporting the method in a wireless communication system. The method may comprise the steps of: receiving, from a radio access network (RAN), an SIB list comprising one or more SIBs supported by a cell; receiving, from the RAN, SIB broadcast information indicating whether the SIB supported by the cell is broadcast in a broadcast control channel (BCCH) section; detecting an omitted SIB on the basis of the SIB list and SIB broadcast information; and requesting the omitted SIB from the RAN. ## Claims ### Claim 1 A method for requesting, by a user equipment (UE), a system information block (SIB) in a wireless communication system, the method comprising: receiving an SIB list comprising one or more SIBs supported by a cell from a radio access network (RAN); receiving, from the RAN, SIB broadcast information informing the UE whether an SIB supported by the cell is broadcast in a broadcast control channel (BCCH) period; detecting a missing SIB based on the SIB list and the SIB broadcast information; and requesting the missing SIB from the RAN, wherein the missing SIB is an SIB that is not broadcast in the BCCH period among the SIBs comprised in the SIB list. ### Claim 2 (depends on 1) The method of claim 1, wherein the BCCH period is a current BCCH period or a next BCCH period. ### Claim 3 (depends on 1) The method of claim 1, wherein the BCCH period is one of a BCCH modification period or a BCCH repetition period. ### Claim 4 (depends on 1) The method of claim 1, wherein the missing SIB is an SIB that the UE needs to receive from the RAN in order to perform a particular service. ### Claim 5 (depends on 4) The method of claim 4, wherein the particular service comprises at least one of a multimedia broadcast/multicast service (MBMS) service, a device-to-device (D2D) service, a vehicle-to-everything (V2X) service, or wireless local area network (WLAN) interworking. ### Claim 6 (depends on 1) The method of claim 1, wherein the missing SIB is requested from the RAN by informing the RAN of a service associated with the missing SIB. ### Claim 7 (depends on 1) The method of claim 1, wherein the SIB list and the SIB broadcast information are received by the UE via particular system information. ### Claim 8 (depends on 7) The method of claim 7, wherein the particular system information is system information that is always broadcast by the RAN. ### Claim 9 (depends on 1) The method of claim 1, further comprising: receiving a probability factor from the RAN, wherein based on a random number drawn by the UE that is less than or equal to the probability factor, the missing SIB is requested from the RAN. ### Claim 10 (depends on 1) The method of claim 1, further comprising: receiving, from the RAN, a value tag informing the UE of system information to be requested from the RAN, wherein based on the missing SIB that is the system information informed by the value tag, the missing SIB is requested from the RAN. ### Claim 11 (depends on 1) The method of claim 1, further comprising: receiving, from the RAN, a number of a type of SIB to be requested from the RAN, wherein based on the missing SIB that matches the number of the type of SIB to be requested, the missing SIB is requested from the RAN. ### Claim 12 (depends on 1) The method of claim 1, further comprising: receiving, from the RAN, a set of SIBs to be requested from the RAN, wherein based on the missing SIB in the set of SIBs to be requested, the missing SIB is requested from the RAN. ### Claim 13 (depends on 1) The method of claim 1, further comprising: receiving the missing SIB from the RAN in response to the request. ### Claim 14 A user equipment (UE) for requesting a system information block (SIB) in a wireless communication system, the UE comprising: a memory; a transceiver; and a processor functionally in communication with the memory and the transceiver, wherein the processor is configured to: control the transceiver to receive an SIB list comprising one or more SIBs supported by a cell from a radio access network (RAN); control the transceiver to receive, from the RAN, SIB broadcast information informing the UE whether an SIB supported by the cell is broadcast in a broadcast control channel (BCCH) period; detect a missing SIB based on the SIB list and the SIB broadcast information; and control the transceiver to request the missing SIB from the RAN, wherein the missing SIB is an SIB that is not broadcast in the BCCH period among the SIBs comprised in the SIB list.