# US 2021/0243055 A1 · Apparatus and method for performing radio communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243055 A1 - Document ID: US20210243055A1 - Status: Published application - Kind: A1 - Application number: 17/234,025 - Filed: 2021-04-19 - Published: 2021-08-05 - Earliest claimed: 2016-01-26 - Assignees: Sony Group Corporation - Applicants: Sony Group Corporation - Inventors: Hiroki MATSUDA; Ryota KIMURA; Kazuyuki SHIMEZAWA - Web page: https://patentgrep.com/patent/US20210243055A1 ## CPC - H04L 27/26265: {Arrangements for sidelobes suppression specially adapted to multicarrier systems, e.g. spectral precoding} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 25/03159: {operating in the frequency domain (H04L25/03165, H04L25/03178 take precedence)} - H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]} - H04L 27/2627: {Modulators} - H04L 27/264: {Pulse-shaped multi-carrier, i.e. not using rectangular window} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - 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 An apparatus including: a communication unit configured to perform radio communication; and a control unit configured to perform control such that control information regarding a filter length of a filter for limiting a width of a guard band in a frequency band to be used in the radio communication is transmitted to an external apparatus through the radio communication. The filter length is determined in accordance with at least one of a frequency resource and a time resource for the radio communication. The apparatus enables a filter improving frequency use efficiency. ## Claims ### Claim 1 An apparatus comprising: a circuitry configured to perform radio communication; control such that information for determining a width of a guard band in a frequency band to be used in the radio communication is transmitted to an external apparatus through the radio communication, wherein the width is determined based on a corresponding configuration of resource blocks and a subcarrier spacing for the radio communication, wherein the information for determining the width of the guard band is transmitted as part of radio resource control (RRC) signaling. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the processor circuit changes the width on a basis of a predetermined condition. ### Claim 3 (depends on 2) The apparatus according to claim 2, further comprising: a memory configured to store the information. ### Claim 4 (depends on 3) The apparatus according to claim 3, wherein the guard band is limited by a filter in a frequency band to be used in the radio communication, ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the width is further determined based on a time resource for the radio communication. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein the processor circuit determines the switched width from a plurality of preset candidates on the basis of a predetermined condition, or wherein the processor circuit switches the width after receiving a request for switching of the width from the external apparatus, or wherein the processor circuit switches the width in accordance with at least one of a predetermined timing or a re-transmission timing. ### Claim 7 An apparatus comprising: a circuitry configured to perform radio communication; and acquire information for determining a width of a guard band in a frequency band to be used in the radio communication from an external apparatus through the radio communication, wherein the width is determined based on a corresponding configuration of resource blocks and a subcarrier spacing for the radio communication, wherein the information for determining the width of the guard band is transmitted as part of radio resource control (RRC) signaling. ### Claim 8 (depends on 7) The apparatus according to claim 7, wherein the circuitry further configured to perform control such that a request for switching of the width is transmitted to the external apparatus through the radio communication in accordance with a predetermined condition. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the circuitry further configured to perform control such that the request is transmitted to the external apparatus through the radio communication in accordance with a quality of the radio communication or a decoding result of data received from the external apparatus through the radio communication. ### Claim 10 (depends on 8) The apparatus according to claim 8, wherein the circuitry configured to perform control such that a filter for limiting a width of a guard band in a frequency band to be used in the radio communication ### Claim 11 (depends on 8) The apparatus of claim 8, wherein the width is further determined based on a time resource for the radio communication. ### Claim 12 A method comprising: performing radio communication; and performing control, by a processor, such that information for determining a width of a guard band in a frequency band to be used in the radio communication is transmitted to an external apparatus through the radio communication, wherein the width is determined based on a corresponding configuration of resource blocks and a subcarrier spacing for the radio communication, and wherein the information for determining the width of the guard band is transmitted as part of radio resource control (RRC) signaling. ### Claim 13 (depends on 12) The method according to claim 12, changing the width on a basis of a predetermined condition. ### Claim 14 (depends on 13) The method according to claim 13, wherein the width is further determined based on a time resource for the radio communication. ### Claim 15 (depends on 14) The method according to claim 14, wherein switching width from a plurality of preset candidates on the basis of a predetermined condition, or switching the width after receiving a request for switching of the width from the external apparatus, or switching the width in accordance with at least one of a predetermined timing or a re-transmission timing. ### Claim 16 A method comprising: performing radio communication; and acquiring, by a processor, information for determining a width of a guard band in a frequency band to be used in the radio communication from an external apparatus through the radio communication, wherein the width is determined based on a corresponding configuration of resource blocks and a subcarrier spacing for the radio communication, and wherein the information for determining the width of the guard band is transmitted as part of radio resource control (RRC) signaling. ### Claim 17 (depends on 16) The method according to claim 16, controlling such that a request for switching of the width is transmitted to the external apparatus through the radio communication in accordance with a predetermined condition. ### Claim 18 (depends on 16) The method according to claim 16, further performing control such that the request is transmitted to the external apparatus through the radio communication in accordance with a decoding result of data received from the external apparatus through the radio communication. ### Claim 19 (depends on 16) The method according to claim 16, further performing control such that a filter for limiting a width of a guard band in a frequency band to be used in the radio communication ### Claim 20 (depends on 16) The method of claim 16, wherein the width is further determined based on a time resource for the radio communication.