# US 10,484,191 B2 · Wireless communication device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,191 B2 - Document ID: US10484191B2 - Status: Granted - Kind: B2 - Application number: 15/122,574 - Filed: 2015-01-05 - Published: 2017-03-16 - Granted: 2019-11-19 - Earliest claimed: 2014-03-26 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Takeshi Itagaki; Tomoya Yamaura; Masanori Sato - Web page: https://patentgrep.com/patent/US10484191B2 ## CPC - H04L 12/1868: {Measures taken after transmission, e.g. acknowledgments} - H04B 7/0452: Multi-user MIMO systems - H04B 7/0697: {using spatial multiplexing} - H04L 1/0041: {Arrangements at the transmitter end} - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - H04L 1/1854: {Scheduling and prioritising arrangements} - 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 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 4/08: User group management - H04W 16/28: using beam steering - H04W 52/242: {taking into account path loss} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/30: Resource management for broadcast services - H04W 76/14: Direct-mode setup - H04W 84/12: WLAN [Wireless Local Area Networks] - H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)} - H04L 2001/0093: {Point-to-multipoint} - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor 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) - H04B: TRANSMISSION - 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 [Object] To improve the reliability by using an acknowledgement response while using radio resources efficiently in multicast transmission over wireless transmission. [Solution] A plurality of wireless communication devices included in a multicast group, when receiving a data frame, transmit simultaneously an acknowledgement response of multicast using spatial multiplexing in response to an acknowledgement request from a transmission source. On the other hand, a wireless communication device of the transmission source decomposes the acknowledgement responses simultaneously received into the original individual acknowledgement responses and restores them using signal processing based on information on a channel with each wireless communication device of a transmission destination. ## Claims ### Claim 1 A wireless communication device comprising: a circuitry configured to communicate wirelessly with a plurality of slave stations under control; control data transmission with each of the slave stations; control the wireless communication device serving as a master station to perform multicast transmission to the plurality of slave stations; specify, in an acknowledgement request frame, two or more slave stations selected from the plurality of slave stations transmitting respective acknowledgement responses and a transmission scheme of the respective acknowledgement responses; transmit the acknowledgement request frame that requests the respective acknowledgement responses for the multicast transmission from the two or more of the plurality of slave stations; receive the respective acknowledgement responses simultaneously transmitted from the two or more of the plurality of slave stations; acquire information on each of respective propagation paths between each of the two or more of the plurality of slave stations and the wireless communication device from each of training signals simultaneously transmitted from each of the two or more of the plurality of slave stations in accordance with an encoding scheme; and separate the respective acknowledgement responses received simultaneously from the two or more of the plurality of slave stations on a basis of the information on the respective propagation paths between the two or more of the plurality of slave stations and the wireless communication device, wherein the transmission scheme includes the encoding scheme of the training signals for the plurality of acknowledgement responses to be separated, the training signals being encoded orthogonal to each other in accordance with the encoding scheme and transmitted simultaneously, each of the training signals being included in each response frame together with each of the acknowledgement responses. ### Claim 2 (depends on 1) The wireless communication device according to claim 1, wherein the transmission scheme includes information on a modulation method and/or an error correction coding for the plurality of acknowledgement responses. ### Claim 3 (depends on 1) The wireless communication device according to claim 1, wherein the transmission scheme includes information on transmission power of the plurality of acknowledgement responses. ### Claim 4 (depends on 1) The wireless communication device according to claim 1, wherein the two or more of the plurality of slave stations are classified into a subgroup, and the circuitry is further configured to: notify the two or more of the plurality of slave stations of the transmission scheme in a management frame or a beacon frame that contains subgroup identification information specifying that the two or more of the plurality of slave stations are members of the subgroup. ### Claim 5 (depends on 1) The wireless communication device according to claim 1, wherein the wireless communication device is configured to operate as an access point supporting IEEE 802.11 standard or a group owner (GO) supporting Wi-Fi direct standard. ### Claim 6 A wireless communication device comprising: circuitry configured to communicate wirelessly with a master station; and control data transmission with the master station, wherein the circuitry is further configured to: receive a frame transmitted by multicast to a multicast group including the wireless communication device, and an acknowledgement request frame transmitted from the master station that requests respective acknowledgement responses for the multicast transmission from a subgroup of the multicast group, wherein the acknowledgement request frame specifies the subgroup and a transmission scheme of the respective acknowledgement responses, and when the subgroup includes the wireless communication device, transmit an acknowledgement response after a lapse of a predetermined time from reception of the acknowledgement request frame in accordance with the transmission scheme of the respective acknowledgement responses, wherein the transmission scheme includes an encoding scheme of a training signal to spatially multiplex the acknowledgement response, the spatially multiplexed acknowledgement response being spatially demultiplexed in the master station from among the respective acknowledgement responses transmitted simultaneously from a plurality of slave stations of the subgroup, and the circuitry is further configured to: encode the training signal in accordance with the encoding scheme, respective training signals of the plurality of slave stations of the subgroup being encoded orthogonal to each other in accordance with the encoding scheme, and transmit the encoded training signal. ### Claim 7 (depends on 6) The wireless communication device according to claim 6, wherein the transmission scheme of the acknowledgement response includes information on a modulation method and/or an error correction coding, and the circuitry is further configured to: determine the modulation method and/or the error correction coding to be used for the acknowledgement response in accordance with the transmission scheme specified from the master station. ### Claim 8 (depends on 6) The wireless communication device according to claim 6, wherein the transmission scheme includes information on transmission power of the acknowledgement response, and the circuitry is further configured to: determine transmission power to be used for the acknowledgement response in accordance with the transmission scheme specified from the master station. ### Claim 9 (depends on 6) The wireless communication device according to claim 6, wherein the circuitry is further configured to: determine whether to cause the circuitry to transmit the acknowledgement response based on a relationship between a sequence number of a received multicast data frame and subgroup identification information notified previously from the master station. ### Claim 10 (depends on 6) The wireless communication device according to claim 6, wherein the circuitry is further configured to: set transmission power in such a way that received power in the master station is predetermined power based on an estimation of a path loss between the wireless communication device and the master station, and transmit the acknowledgement response. ### Claim 11 (depends on 6) The wireless communication device according to claim 6, wherein the wireless communication device is configured to operate as a station supporting IEEE 802.11 standard or a client supporting Wi-Fi direct standard.