# US 2021/0083733 A1 · Aggregation methods and systems for multi-user mimo or ofdma operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0083733 A1 - Document ID: US20210083733A1 - Status: Published application - Kind: A1 - Application number: 17/035,507 - Filed: 2020-09-28 - Published: 2021-03-18 - Earliest claimed: 2015-03-27 - Assignees: Newracom, Inc. - Applicants: Newracom, Inc. - Inventors: Ahmad Reza HEDAYAT - Web page: https://patentgrep.com/patent/US20210083733A1 ## CPC - H04B 7/0452: Multi-user MIMO systems - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0037: {Inter-user or inter-terminal allocation} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 27/2602: {Signal structure} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In an example of multi-user wireless communications, an access point may send a downlink frame, including a first signaling field and a second signaling field, to multiple stations. The first and second signaling fields are located in a header of the downlink frame. The first signaling field indicates whether the downlink frame is associated with a multi-user (MU) multi-input multi-output (MIMO) transmission. The second signaling field includes an attribute of the MU-MIMO transmission or a non-MU-MIMO transmission. A resource unit of the downlink frame includes a MU-MIMO payload when the downlink frame is associated with the MU-MIMO transmission. A resource unit of the downlink frame includes a non-MU-MIMO payload when the downlink frame is associated with the non-MU-MIMO transmission. The stations may decode one or more portions of the downlink frame based on the attribute in the second signaling field. Other methods, apparatus, and computer-readable media are also disclosed. ## Claims ### Claim at position 1 1-20. (canceled) ### Claim 21 A wireless device, comprising: a processing device; and a memory unit coupled to the processing device, wherein the memory unit includes instructions that when executed by the processing device cause the wireless device to: set a more data field in a frame to be transmitted to a set of stations in a wireless network, wherein the more data field indicates whether a first set of training fields are present in the frame, add the first set of training fields to the frame when the more data field is set to a predetermined value, and transmit the frame to the set of stations. ### Claim 22 (depends on 21) The wireless device of claim 21, wherein the instructions, when executed by the processing device, further cause the wireless device to: add a first set of data fields to the frame; and add, when the more data field is set to the predetermined value, a second set of data fields to the frame following the first set of data fields. ### Claim 23 (depends on 22) The wireless device of claim 22, wherein the first set of training fields are located between the first set of data fields and the second set of data fields. ### Claim 24 (depends on 23) The wireless device of claim 23, wherein the first set of training fields is a set of high efficiency long training fields that are to assist the set of stations perform physical layer processing on the frame. ### Claim 25 (depends on 24) The wireless device of claim 24, wherein the instructions, when executed by the processing device, further cause the wireless device to: add a second set of training fields to the frame, wherein the second set of training fields are the set of high efficiency long training fields. ### Claim 26 (depends on 25) The wireless device of claim 25, wherein the second set of training fields are located in the frame before the first set of training fields. ### Claim 27 (depends on 26) The wireless device of claim 26, wherein the first set of training fields, the first set of data fields, and the second set of data fields are located in a data portion of the frame and the second set of training fields are located in a preamble of the frame. ### Claim 28 (depends on 26) The wireless device of claim 26, wherein a number of symbols for the first and second set of training fields is dependent on a number of spatial streams associated with a resource unit in which the first and second set of training fields are carried in the frame. ### Claim 29 (depends on 26) The wireless device of claim 26, wherein the first set of data fields is a same length as the second set of data fields. ### Claim 30 (depends on 21) The wireless device of claim 21, wherein the more data field consists of a single bit and the predetermined value is the value one. ### Claim 31 (depends on 21) The wireless device of claim 21, wherein the instructions, when executed by the processing device, further cause the wireless device to: set a first signaling field of the frame to indicate whether the frame is part of a multi-user (MU)-multi-input multi-output (MIMO) transmission; when the first signaling field is set to indicate the MU-MIMO transmission, setting one or more attributes of the MU-MIMO transmission in a second signaling field of the frame; and when the first signaling field is set to indicate a transmission that is a non-MU-MIMO transmission, set one or more attributes of the non-MU-MIMO transmission in the second signaling field. ### Claim 32 A wireless device, comprising: a processing device; and a memory unit coupled to the processing device, wherein the memory unit includes instructions that when executed by the processing device cause the wireless device to: process a more data field in a frame received from a station in a wireless network, wherein the more data field indicates whether a first set of training fields are present in the frame, process a first set of data fields in the frame, process the first set of training fields in the frame when the more data field is set to a predetermined value, and process a second set of data fields in the frame when the more data field is set to the predetermined value. ### Claim 33 (depends on 32) The wireless device of claim 32, wherein the first set of training fields are located between the first set of data fields and the second set of data fields. ### Claim 34 (depends on 33) The wireless device of claim 33, wherein the first set of training fields is a set of high efficiency long training fields that are to assist the wireless device perform physical layer processing on the frame. ### Claim 35 (depends on 34) The wireless device of claim 34, wherein the instructions, when executed by the processing device, further cause the wireless device to: process a second set of training fields in the frame, wherein the second set of training fields are located in the frame before the first set of training fields and, wherein the second set of training fields are the set of high efficiency long training fields. ### Claim 36 (depends on 35) The wireless device of claim 35, wherein the first set of training fields, the first set of data fields, and the second set of data fields are located in a data portion of the frame and the second set of training fields are located in a preamble of the frame. ### Claim 37 (depends on 35) The wireless device of claim 35, wherein a number of symbols for the first and second set of training fields is dependent on a number of spatial streams associated with a resource unit in which the first and second set of training fields are carried in the frame. ### Claim 38 (depends on 35) The wireless device of claim 35, wherein the first set of data fields is a same length as the second set of data fields. ### Claim 39 (depends on 32) The wireless device of claim 32, wherein the more data field consists of a single bit and the predetermined value is the value one. ### Claim 40 (depends on 32) The wireless device of claim 32, wherein the instructions, when executed by the processing device, further cause the wireless device to: determine whether a first header field of the frame indicates a first type of transmission or a second type of transmission; determine one or more attributes of the first type of transmission in a second header field of the frame when the first header field is determined to indicate the first type of transmission; determine one or more attributes of the second type of transmission in the second header field of the frame when the first header field is determined to indicate the second type of transmission; and process one or more portions of the frame based on the one or more attributes of the first type of transmission or the one or more attributes of the second type of transmission.