# US 11,452,116 B2 · Apparatus and method for multi-link operation by access point with simultaneous transmit-receive constraints > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,116 B2 - Document ID: US11452116B2 - Status: Granted - Kind: B2 - Application number: 17/170,370 - Filed: 2021-02-08 - Published: 2022-04-14 - Granted: 2022-09-20 - Earliest claimed: 2020-10-08 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sharan Naribole; Srinivas Kandala; Ashok Ranganath - Web page: https://patentgrep.com/patent/US11452116B2 ## CPC - H04W 72/12: Wireless traffic scheduling - H04W 72/54: based on quality criteria - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 74/0816: with collision avoidance - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W 88/08: Access point 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 and apparatuses are provided for a medium access protocol at non-simultaneous transmission and reception (STR) access points (APs) and end user devices (STAs). A method performed by a non-STR MAP includes identifying a medium state of a first channel of the MAP; and adapting transmission on a second channel of the MAP, based on the identified medium state of the first channel. ## Claims ### Claim 1 A method performed by a non-simultaneous transmission and reception (STR) mobile access point (MAP), the method comprising: identifying a medium state of a first channel of the MAP; and adapting transmission on a second channel of the MAP, based on the identified medium state of the first channel. ### Claim 2 (depends on 1) The method of claim 1, wherein adapting the transmission on the second channel of the MAP comprises aggregating the transmission on the second channel with transmission on the first channel, in response to a network allocation vector (NAV) being zero and to identifying that the medium state of the first channel is in an idle state. ### Claim 3 (depends on 2) The method of claim 2, wherein aggregating the transmission on the second channel with the transmission on the first channel comprises aligning starting and ending points of data frames and transmission opportunity period (TXOP) durations on the first and second channels. ### Claim 4 (depends on 1) The method of claim 1, further comprising determining that backoff counters for each of the first channel and the second channel have expired, prior to aggregating the transmission on the second channel with the transmission on the first channel. ### Claim 5 (depends on 1) The method of claim 1, further comprising, in response to determining that one of the first channel and the second channel becomes busy, prior to a backoff counter of the other of the first channel and the second channel having expired, generating a new backoff counter value for the backoff counter of the other of the first channel and the second channel. ### Claim 6 (depends on 1) The method of claim 1, wherein adapting transmission on the second channel of the MAP comprises aligning an ending of a transmission opportunity period (TXOP) on the second channel with an expiry of a network allocation vector (NAV) on the first channel, in response to the NAV being non-zero and to identifying that the medium state of the first channel is in a busy state. ### Claim 7 (depends on 6) The method of claim 6, wherein the NAV is set in response to a received overlapping basic service set (OBSS) frame. ### Claim 8 A non-simultaneous transmission and reception (STR) mobile access point (MAP), the MAP comprising: a transceiver; and a processor configured to: identify a medium state of a first channel of the MAP, and adapt transmission on a second channel of the MAP, based on the identified medium state of the first channel. ### Claim 9 (depends on 8) The MAP of claim 8, wherein the processor is further configured to adapt the transmission on the second channel of the MAP by aggregating the transmission on the second channel with transmission on the first channel, in response to a network allocation vector (NAV) being zero and to identifying that the medium state of the first channel is in an idle state. ### Claim 10 (depends on 9) The MAP of claim 9, wherein the processor is further configured to aggregate the transmission on the second channel with the transmission on the first channel by aligning starting and ending points of data frames and transmission opportunity period (TXOP) durations on the first and second channels. ### Claim 11 (depends on 8) The MAP of claim 8, wherein the processor is further configured to determine that backoff counters for each of the first channel and the second channel have expired, prior to aggregating the transmission on the second channel with the transmission on the first channel. ### Claim 12 (depends on 8) The MAP of claim 8, wherein the processor is further configured to, in response to determining that one of the first channel and the second channel becomes busy, prior to a backoff counter of the other of the first channel and the second channel having expired, generate a new backoff counter value for the backoff counter of the other of the first channel and the second channel. ### Claim 13 (depends on 8) The MAP of claim 8, wherein the processor is further configured to adapt the transmission on the second channel of the MAP by aligning an ending of a transmission opportunity period (TXOP) on the second channel with an expiry of a network allocation vector (NAV) on the first channel, in response to the NAV being non-zero and to identifying that the medium state of the first channel is in a busy state. ### Claim 14 (depends on 13) The MAP of claim 13, wherein the NAV is set in response to a received overlapping basic service set (OBSS) frame. ### Claim 15 A method performed by a non-simultaneous transmission and reception (STR) end user device (STA), the method comprising: transmitting, on a first channel, to a mobile access point (MAP), a request to send (RTS) message; identifying that no clear to send (CTS) message is received from the MAP, in response to transmitting the RTS message; identifying that a medium state of the first channel is idle; and activating a recess timer countdown, in response to identifying that no CTS message is received and that the medium state of the first channel is idle. ### Claim 16 (depends on 15) The method of claim 15, further comprising: monitoring a second channel of the MAP for a frame from the MAP; and cancelling the recess timer countdown, in response to identifying the frame from the MAP. ### Claim 17 (depends on 16) The method of claim 16, further comprising updating a network allocation vector (NAV) of the first channel, in response to the identified frame being an overlapping basic service set (OBSS) frame. ### Claim 18 A non-simultaneous transmission and reception (STR) end user device (STA), the STA comprising: a transceiver; and a processor configured to: transmit, via the transceiver, on a first channel, to a mobile access point (MAP), a request to send (RTS) message; identify that no clear to send (CTS) message is received from the MAP, in response to transmitting the RTS message; identify that a medium state of the first channel is idle; and activate a recess timer countdown, in response to identifying that no CTS message is received and that the medium state of the first channel is idle. ### Claim 19 (depends on 18) The STA of claim 18, wherein the processor is further configured to: monitor a second channel of the MAP for a frame from the MAP; and cancel the recess timer countdown, in response to identifying the frame from the MAP. ### Claim 20 (depends on 19) The STA of claim 19, wherein the processor is further configured to update a network allocation vector (NAV) of the first channel, in response to the identified frame being an overlapping basic service set (OBSS) frame.