# US 12,193,052 B2 · Communication device, communication method, and computer-readable storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,193,052 B2 - Document ID: US12193052B2 - Status: Granted - Kind: B2 - Application number: 17/411,083 - Filed: 2021-08-25 - Published: 2021-12-16 - Granted: 2025-01-07 - Earliest claimed: 2019-02-28 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Masatomo Ouchi - Web page: https://patentgrep.com/patent/US12193052B2 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 25/03006: {Arrangements for removing intersymbol interference} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 2025/03815: {Transmission of a training request} - H04W 84/12: WLAN [Wireless Local Area Networks] - Y02D 30/70: in wireless communication networks - 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) - 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 communication device that forms a first Basic Service Set (BSS) communicates a radio frame including a preamble and a data field of a physical layer (PHY). The preamble includes an Extremely High Throughput (EHT) Signal Field (EHT-SIG-A). The EHT-SIG-A includes a subfield for setting a BSS color, and if the communication device and a first other communication device are to cooperatively transmit the radio frame to a second other communication device, a value of this subfield is set, without changing the BSS color used in a first BSS, based on the BSS color of a second BSS to which the second other communication device belongs. ## Claims ### Claim 1 An access point apparatus that forms a first Basic Service Set (BSS), and transmits a radio frame including a preamble and a data field of a physical layer (PHY), wherein the preamble includes: a Legacy Short Training Field (L-STF); a Legacy Long Training Field (L-LTF) arranged immediately after the L-STF in the radio frame; a Legacy Signal Field (L-SIG) arranged immediately after the L-LTF in the radio frame; and a Second Signal Field arranged after the L-SIG in the radio frame, wherein the Second Signal Field includes a subfield for setting a BSS color, and in a case where the access point apparatus, operating as one of a coordinating access point and a coordinated access point, is to transmit the radio frame in a coordinated transmission designated to a single station apparatus, and another access point apparatus, operating as the other one of the coordinating access point and the coordinated access point, is to transmit another radio frame in the coordinated transmission designated to the same single station apparatus, a same value is set to the subfield of the radio frame transmitted by the access point apparatus and to the subfield of the another radio frame transmitted by the another access point apparatus, wherein the access point apparatus and the another access point apparatus perform the coordinated transmission by using a corresponding frequency channel in a corresponding transmission duration. ### Claim 2 (depends on 1) The access point apparatus according to claim 1, wherein in a case where the single station apparatus is associated with a second BSS formed by the another access point apparatus, a BSS color used in the second BSS is set as the value of the subfield of the radio frame to perform the coordinated transmission performed by the access point apparatus and the another access point apparatus. ### Claim 3 (depends on 2) The access point apparatus according to claim 2, wherein the access point apparatus obtains information of the BSS color of the second BSS from the another access point apparatus. ### Claim 4 (depends on 2) The access point apparatus according to claim 2, wherein in a case where the access point apparatus and the another access point apparatus are to perform the coordinated transmission and the single station apparatus is associated with the second BSS, the access point apparatus obtains information of the station apparatus from the another access point apparatus. ### Claim 5 (depends on 1) The access point apparatus according to claim 1, wherein the BSS color used in the first BSS is set as the value of the subfield, in a case where the access point apparatus and the another access point apparatus are to perform the coordinated transmission and the single station apparatus is associated with the first BSS. ### Claim 6 (depends on 5) The access point apparatus according to claim 5, wherein the access point apparatus notifies the another access point apparatus of information of the single station apparatus, in a case where the access point apparatus and the another access point apparatus are to perform the coordinated transmission and the single station apparatus is associated with the first BSS. ### Claim 7 (depends on 1) The access point apparatus according to claim 1, wherein the access point apparatus notifies the another access point apparatus of the information of the BSS color of the first BSS. ### Claim 8 (depends on 1) The access point apparatus according to claim 1, wherein while the access point apparatus is operating in a mode in which the radio frame is transmitted by the coordinated transmission, the value of the subfield is set based on the BSS color of the BSS to which a device of a transmission destination of the radio frame belongs. ### Claim 9 (depends on 8) The access point apparatus according to claim 8, wherein while the access point apparatus is not operating in the mode, the value of the subfield is set based on the BSS color of the first BSS. ### Claim 10 (depends on 1) The access point apparatus according to claim 1, wherein each of the access point apparatus and the another access point apparatus is an access point apparatus complying with IEEE802.11EHT, and the station apparatus is a station apparatus complying with IEEE802.11EHT. ### Claim 11 (depends on 1) The access point apparatus according to claim 1 wherein, the value of the subfield is determined based on at least whether the access point apparatus performs the coordinated transmission or not. ### Claim 12 (depends on 1) The access point apparatus according to claim 1 wherein, while a value of the subfield is set to a first BSS color used in a first BSS formed by the access point apparatus, in a case where the access point apparatus transmits a radio frame designated to a first station associated with the first BSS, a value of the subfield is set to a second BSS color used in a second BSS, in a case where the access point apparatus is to transmit the radio frame in a coordinated transmission designated to a second station associated with the second BSS and the another access point apparatus is to transmit another radio frame in the coordinated transmission designated to the second station. ### Claim 13 (depends on 1) The access point apparatus according to claim 1 wherein, the access point apparatus and the another access point apparatus perform the coordinated transmission by using a corresponding Resource Unit (RU) having the same frequency channel. ### Claim 14 (depends on 1) The access point apparatus according to claim 1 wherein, the coordinated transmission is performed by using Distributed-Multi Input and Multi Output (Distributed MIMO). ### Claim 15 A communication method executed by an access point apparatus configured to form a first Basic Service Set (BSS), comprising: transmitting a radio frame including a preamble and a data field of a physical layer (PHY), wherein the preamble includes: a Legacy Short Training Field (L-STF); a Legacy Long Training Field (L-LTF) arranged immediately after the L-STF in the radio frame; a Legacy Signal Field (L-SIG) arranged immediately after the L-LTF in the radio frame; and a Second Signal Field arranged after the L-SIG in the radio frame wherein the Second Signal Field includes a subfield for setting a BSS color, and in a case where the access point apparatus, operating as one of a coordinating access point and a coordinated access point, is to transmit the radio frame in a coordinated transmission designated to a single station apparatus, and another access point apparatus, operating as the other one of the coordinating access point and the coordinated access point, is to transmit another radio frame in the coordinated transmission designated to the same single station apparatus, a same value is set to the subfield of the radio frame transmitted by the access point apparatus and to the subfield of the another radio frame transmitted by the another access point apparatus, wherein the access point apparatus and the another access point apparatus perform the coordinated transmission by using a corresponding frequency channel in a corresponding transmission duration. ### Claim 16 A non-transitory computer-readable storage medium that stores a program configured to cause a computer included in an access point apparatus to: form a first Basic Service Set (BSS), and transmit a radio frame including a preamble and a data field of a physical layer (PHY), wherein the preamble includes: a Legacy Short Training Field (L-STF); a Legacy Long Training Field (L-LTF) arranged immediately after the L-STF in the radio frame; a Legacy Signal Field (L-SIG) arranged immediately after the L-LTF in the radio frame; and a Second Signal Field arranged after the L-SIG in the radio frame, wherein the Second Signal Field includes a subfield for setting a BSS color, and in a case where the access point apparatus, operating as one of a coordinating access point and a coordinated access point, is to transmit the radio frame in a coordinated transmission designated to a single station apparatus, and another access point apparatus, operating as the other one of the coordinating access point and the coordinated access point, is to transmit another radio frame in the coordinate transmission designated to the station apparatus, a same value is set to the subfield of the radio frame transmitted by the access point apparatus and to the subfield of the another radio frame transmitted by the another access point apparatus, wherein the access point apparatus and the another access point apparatus perform the coordinated transmission by using a corresponding frequency channel in a corresponding transmission duration.