# US 2018/0324849 A1 · Reverse direction protocol enhancements > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324849 A1 - Document ID: US20180324849A1 - Status: Published application - Kind: A1 - Application number: 15/968,554 - Filed: 2018-05-01 - Published: 2018-11-08 - Earliest claimed: 2017-05-03 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alfred ASTERJADHI; George CHERIAN; Abhishek Pramod PATIL; Alireza RAISSINIA - Web page: https://patentgrep.com/patent/US20180324849A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/02: Hybrid access - H04W 74/002: {Transmission of channel access control information} - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W 92/18: between terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods, apparatuses, and computer-readable mediums for wireless communication are provided. In an aspect, a second device is configured to receive, from a first device, a reverse direction (RD) grant associated with first device. The RD grant allocates transmission opportunity (TXOP) resources to the second device from the first device. In addition, the second device is configured to send information to the first device indicating an amount of TXOP resources that the second device intends to use. ## Claims ### Claim 1 A method of wireless communication by a second device, comprising: receiving a reverse direction (RD) grant associated with a first device, the RD grant allocating transmission opportunity (TXOP) resources to the second device from the first device; generating, in response to receiving the RD grant, a control response aggregated with at least one media access control protocol data unit (MPDU); and transmitting the control response to the first device. ### Claim 2 (depends on 1) The method of claim 1, wherein the at least one MPDU includes an indication that the second device accepts the RD grant to retain control of an RD response burst. ### Claim 3 (depends on 2) The method of claim 2, wherein the indication that the second device accepts the RD grant also indicates that additional frames will be transmitted in response to the RD grant. ### Claim 4 (depends on 1) The method of claim 1, wherein the at least one MPDU is one or more of a quality of service (QoS) Null frame, a QoS data frame, or a management frame. ### Claim 5 (depends on 1) The method of claim 1, wherein the at least one MPDU includes an indication that the second device declines the RD grant. ### Claim 6 (depends on 5) The method of claim 5, wherein the indication that the second device declines the RD grant also indicates that additional frames will not be transmitted in response to the RD grant. ### Claim 7 (depends on 1) The method of claim 1, further comprising receiving, from the first device, an acknowledgment of the control response. ### Claim 8 A method of wireless communication by a second device, comprising: generating a reverse direction (RD) exchange request requesting a first device to initiate an RD exchange sequence; and transmitting the RD exchange request to the first device. ### Claim 9 (depends on 8) The method of claim 8, wherein the RD exchange request is indicated in a quality of service (QoS) Null frame or a QoS data frame. ### Claim 10 (depends on 8) The method of claim 8, further comprising: generating an indication that the second device supports an RD exchange; and transmitting, to the first device, the indication that the second device supports the RD exchange. ### Claim 11 (depends on 10) The method of claim 10, wherein the indication that the second device supports the RD exchange request is included in a capabilities element. ### Claim 12 (depends on 10) The method of claim 10, wherein the indication that the second device supports the RD exchange request is indicated through an uplink multi-user setting being disabled. ### Claim 13 (depends on 8) The method of claim 8, further comprising receiving, from the first device in response to the RD exchange request, a confirmation to the RD exchange request. ### Claim 14 (depends on 8) The method of claim 8, wherein the RD exchange request includes a transmission opportunity (TXOP) duration request indicating a duration of a TXOP to be used by the first device during the RD exchange sequence. ### Claim 15 A method of wireless communication by a first device, comprising: generating a reverse direction (RD) grant associated with the first device, the RD grant allocating transmission opportunity (TXOP) resources to a second device from the first device; transmitting, to the second device, the RD grant associated with the first device; and receiving, in response to the RD grant, a control response aggregated with at least one media access control protocol data unit (MPDU); and determining whether the RD grant is accepted or declined based on the MPDU. ### Claim 16 (depends on 15) The method of claim 15, wherein the at least one MPDU includes an indication that the second device accepts the RD grant to retain control of an RD response burst. ### Claim 17 (depends on 16) The method of claim 16, wherein the indication that the second device accepts the RD grant also indicates that additional frames are transmitted in response to the RD grant. ### Claim 18 (depends on 15) The method of claim 15, wherein the at least one MPDU is one or more of a quality of service (QoS) Null frame, a QoS data frame, or a management frame. ### Claim 19 (depends on 15) The method of claim 15, wherein the at least one MPDU includes an indication that the second device declines the RD grant. ### Claim 20 (depends on 19) The method of claim 19, wherein the indication that the second device declines the RD grant also indicates that additional frames are not transmitted in response to the RD grant. ### Claim 21 (depends on 20) The method of claim 20, wherein the control response is an RD response burst. ### Claim 22 A method of wireless communication by a first device, comprising: receiving, from a second device, a message; and determining that the message includes a reverse direction (RD) requesting the first device to initiate an RD exchange sequence. ### Claim 23 (depends on 22) The method of claim 22, wherein the RD exchange request is indicated in a quality of service (QoS) Null frame or a QoS data frame received from the second device. ### Claim 24 (depends on 22) The method of claim 22, further comprising receiving, from the second device, an indication that the second device supports an RD exchange. ### Claim 25 (depends on 24) The method of claim 24, wherein the indication that the second device supports the RD exchange is included in a capabilities element. ### Claim 26 (depends on 24) The method of claim 24, wherein the indication that the second device supports the RD exchange request is indicated through an uplink multi-user setting being disabled. ### Claim 27 (depends on 22) The method of claim 22, further comprising determining a duration of a subsequent transmission opportunity (TXOP). ### Claim 28 (depends on 22) The method of claim 22, further comprising transmitting, to the second device in response to the RD exchange request, a confirmation of the RD exchange request. ### Claim 29 An apparatus for wireless communication, comprising: a memory; and at least one processor coupled with the memory and configured to: receive a reverse direction (RD) grant associated with a first device, the RD grant allocating transmission opportunity (TXOP) resources to the apparatus from the first device; generate, in response to receiving the RD grant, a control response aggregated with at least one media access control protocol data unit (MPDU); and transmit the control response to the first device. ### Claim 30 An apparatus for wireless communication, comprising: a memory; and at least one processor coupled with the memory and configured to: generate a reverse direction (RD) grant associated with the apparatus, the RD grant allocating transmission opportunity (TXOP) resources to a second device from the apparatus; transmit, to the second device, the RD grant associated with the apparatus; and receive, in response to the RD grant, a control response aggregated with at least one media access control protocol data unit (MPDU); and determine whether the RD grant is accepted or declined based on the MPDU.