# US 11,122,615 B2 · System access method and apparatus of a narrowband terminal in a wireless communication system supporting wideband and narrowband terminals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,615 B2 - Document ID: US11122615B2 - Status: Granted - Kind: B2 - Application number: 17/127,162 - Filed: 2020-12-18 - Published: 2021-04-15 - Granted: 2021-09-14 - Earliest claimed: 2011-09-23 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Youngbum Kim; Juho Lee; Joonyoung Cho - Web page: https://patentgrep.com/patent/US11122615B2 ## CPC - H04W 74/002: {Transmission of channel access control information} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Apparatuses (including base stations and terminals), systems, and methods for supporting both wideband and narrowband communications are described. In one aspect, a base station supporting first type terminals operating on a first bandwidth and second type terminals operating on a second bandwidth is described, having an information formatter, a transceiver, and a controller. The information formatter generates a Low-end Master Information Block (L-MIB) and a Low-end System Information Block (L-SIB), which are transmitted by the transceiver to first type and second type terminals. The L-MIB includes control information on an L-subframe configuration for supporting a second type terminal and a sub-band configuration of the L-subframe, while the L-SIB includes information on downlink reception and uplink transmission of the second type terminal. When the base station receives a Random Access Channel (RACH) preamble request from one of the terminals, the base station performs the random access procedure. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, a master information block (MIB) including information indicating a resource for a physical downlink control channel (PDCCH), through a physical broadcast channel; detecting downlink control information including scheduling information based on the resource for the PDCCH; and receiving, from the base station, system information through a physical downlink shared channel (PDSCH) based on the scheduling information, wherein the system information includes information associated with a random access channel (RACH) configuration, information associated with a bandwidth of a downlink sub-band and a location of the downlink sub-band, and information associated with a bandwidth of an uplink sub-band and a location of the uplink sub-band, and wherein the system information is scheduled within a frequency range of the resource for the PDCCH. ### Claim 2 (depends on 1) The method of claim 1, wherein the location of the downlink sub-band and the location of the uplink sub-band correspond to a start resource block of the downlink sub-band and a start resource block of the uplink sub-band, respectively. ### Claim 3 (depends on 1) The method of claim 1, wherein the information indicating the resource for the PDCCH corresponds to at least one physical resource block (PRB) to which the PDCCH is to be mapped, and wherein the information indicating the resource for the PDCCH indicates a frequency resource for the PDCCH. ### Claim 4 (depends on 1) The method of claim 1, wherein the resource for the PDCCH corresponds to a search space for the PDCCH. ### Claim 5 (depends on 1) The method of claim 1, wherein the RACH configuration includes information associated with a frequency resource for transmitting a random access preamble. ### Claim 6 A terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller configured to: receive, from a base station via the transceiver, a master information block (MIB) including information indicating a resource for a physical downlink control channel (PDCCH), through a physical broadcast channel, detect downlink control information including scheduling information based on the resource for the PDCCH, and receive, from the base station via the transceiver, system information through a physical downlink shared channel (PDSCH) based on the scheduling information, wherein the system information includes information associated with a random access channel (RACH) configuration, information associated with a bandwidth of a downlink sub-band and a location of the downlink sub-band, and information associated with a bandwidth of an uplink sub-band and a location of the uplink sub-band, and wherein the system information is scheduled within a frequency range of the resource for the PDCCH. ### Claim 7 (depends on 6) The terminal of claim 6, wherein the location of the downlink sub-band and the location of the uplink sub-band correspond to a start resource block of the downlink sub-band and a start resource block of the uplink sub-band, respectively. ### Claim 8 (depends on 6) The terminal of claim 6, wherein the information indicating the resource for the PDCCH corresponds to at least one physical resource block (PRB) to which the PDCCH is to be mapped, and wherein the information indicating the resource for the PDCCH indicates a frequency resource for the PDCCH. ### Claim 9 (depends on 6) The terminal of claim 6, wherein the resource for the PDCCH corresponds to a search space for the PDCCH. ### Claim 10 (depends on 6) The terminal of claim 6, wherein the RACH configuration includes information associated with a frequency resource for transmitting a random access preamble. ### Claim 11 A method performed by a base station in a wireless communication system, the method comprising: transmitting a master information block (MIB) including information indicating a resource for a physical downlink control channel (PDCCH) through a physical broadcast channel; transmitting downlink control information including scheduling information through the PDCCH based on the resource for the PDCCH; and transmitting, system information through a physical downlink shared channel (PDSCH) based on the scheduling information, wherein the system information includes information associated with a random access channel (RACH) configuration, information associated with a bandwidth of a downlink sub-band and a location of the downlink sub-band, and information associated with a bandwidth of an uplink sub-band and a location of the uplink sub-band, and wherein the system information is scheduled within a frequency range of the resource for the PDCCH. ### Claim 12 (depends on 11) The method of claim 11, wherein the location of the downlink sub-band and the location of the uplink sub-band correspond to a start resource block of the downlink sub-band and a start resource block of the uplink sub-band, respectively. ### Claim 13 (depends on 11) The method of claim 11, wherein the information indicating the resource for the PDCCH corresponds to at least one physical resource block (PRB) to which the PDCCH is to be mapped, and wherein the information indicating the resource for the PDCCH indicates a frequency resource for the PDCCH. ### Claim 14 (depends on 11) The method of claim 11, wherein the resource for the PDCCH corresponds to a search space for the PDCCH. ### Claim 15 (depends on 11) The method of claim 11, wherein the RACH configuration includes information associated with a frequency resource for transmitting a random access preamble. ### Claim 16 A base station in a wireless communication system, the base station comprising: a transceiver configured to transmit and receive a signal; and a controller configured to: transmit a master information block (MIB) including information indicating a resource for a physical downlink control channel (PDCCH) through a physical broadcast channel, transmit downlink control information including scheduling information through the PDCCH based on the resource for the PDCCH, and transmit system information through a physical downlink shared channel (PDSCH) based on the scheduling information, wherein the system information includes information associated with a random access channel (RACH) configuration, information associated with a bandwidth of a downlink sub-band and a location of the downlink sub-band, and information associated with a bandwidth of an uplink sub-band and a location of the uplink sub-band, and wherein the system information is scheduled within a frequency range of the resource for the PDCCH. ### Claim 17 (depends on 16) The base station of claim 16, wherein the location of the downlink sub-band and the location of the uplink sub-band correspond to a start resource block of the downlink sub-band and a start resource block of the uplink sub-band, respectively. ### Claim 18 (depends on 16) The base station of claim 16, wherein the information indicating the resource for the PDCCH corresponds to at least one physical resource block (PRB) to which the PDCCH is to be mapped, and wherein the information indicating the resource for the PDCCH indicates a frequency resource for the PDCCH. ### Claim 19 (depends on 16) The base station of claim 16, wherein the resource for the PDCCH corresponds to a search space for the PDCCH. ### Claim 20 (depends on 16) The base station of claim 16, wherein the RACH configuration includes information associated with a frequency resource for transmitting a random access preamble.