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WO2025053601A1 - Dispositif et procédé de partage d'opportunité de transmission - Google Patents

Dispositif et procédé de partage d'opportunité de transmission Download PDF

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Publication number
WO2025053601A1
WO2025053601A1 PCT/KR2024/013313 KR2024013313W WO2025053601A1 WO 2025053601 A1 WO2025053601 A1 WO 2025053601A1 KR 2024013313 W KR2024013313 W KR 2024013313W WO 2025053601 A1 WO2025053601 A1 WO 2025053601A1
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Prior art keywords
txop
frame
rts
shared
trigger frame
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Jeong Soo Lee
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Frontside LLC
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Frontside LLC
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present disclosure relates to a wireless local area network (WLAN), and more particularly, to a method for sharing transmission opportunity in the WLAN and a device using the same.
  • WLAN wireless local area network
  • a wireless local area network may be formed by one or more access points (APs) that provide a shared wireless communication medium for use by a number of client devices also referred to as stations (STAs).
  • APs access points
  • STAs stations
  • Orthogonal frequency division multiple access is a multiple access scheme where different subsets of subcarriers are allocated to different users, and this scheme allows simultaneous data transmission to or from one or more users.
  • Transmission opportunity (TXOP) in the WLAN is an interval of time during which a particular STA has the right to initiate frame exchange sequences onto the WM.
  • a TXOP owner which obtains the TXOP only can initiate a transmission during the TXOP duration.
  • Institute of Electrical and Electronics Engineers (IEEE) 802.11be, dubbed Extremely High Throughput (EHT) provides TXOP sharing procedure which allows an AP to allocate a portion of an obtained TXOP to a non-AP STA for transmitting one or more PPDUs.
  • the present disclosure provides a method for sharing a transmission opportunity (TXOP) in a wireless local area network.
  • TXOP transmission opportunity
  • the present disclosure also provides a device for sharing a TXOP in a wireless local area network.
  • a method for sharing a transmission opportunity includes obtaining, by an sharing access point (AP), a TXOP, and transmitting, by the sharing AP, a multi-user request-to-send (MU-RTS) trigger frame, If the MU-RTS trigger frame includes a first basic service set identifier (BSSID), the MU-RTS trigger frame initiates a frame exchange between the sharing AP and at least one station associated with the sharing AP within the TXOP. If the MU-RTS trigger frame includes a second BSSID, the MU-RTS trigger frame initiates a frame exchange between a shared AP and at least one station associated with the shared AP within the TXOP.
  • BSSID basic service set identifier
  • the MU-RTS trigger frame includes a second BSSID
  • a device operating as a sharing access point (AP) to share a transmission opportunity (TXOP) includes a processor, and a memory operatively coupled with the processor and configured to store instructions that, when executed by the processor, cause the device to perform functions.
  • the functions include obtaining a TXOP, and transmitting a multi-user request-to-send (MU-RTS) trigger frame.
  • the MU-RTS trigger frame includes a first basic service set identifier (BSSID)
  • the MU-RTS trigger frame initiates a frame exchange between the device and at least one station associated with the device within the TXOP.
  • the MU-RTS trigger frame includes a second BSSID
  • the MU-RTS trigger frame initiates a frame exchange between a shared AP and at least one station associated with the shared AP within the TXOP.
  • non-primary channel access mechanism is provided to support signaling regarding features and resource allocations.
  • FIG. 2 shows a block diagram of an example wireless communication device.
  • FIG. 3 shows an example of wireless channel that includes multiple subchannels.
  • FIG. 5 shows an example of UL MU transmission.
  • FIG. 8 shows another example of sharing TXOP according to an embodiment of the present disclosure.
  • FIG. 10 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • FIG. 11 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • FIG. 13 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • FIG. 14 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • the described implementations can be implemented in any device, system or network that is capable of transmitting and receiving RF signals according to one or more of the following technologies or techniques: code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrier FDMA (SC-FDMA), single-user (SU) multiple-input multiple-output (MIMO) and multi-user (MU) MIMO.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • SU single-user
  • MIMO multiple-input multiple-output
  • MU multi-user
  • the described implementations also can be implemented using other wireless communication protocols or RF signals suitable for use in one or more of a wireless personal area network (WPAN), a wireless local area network (WLAN), a wireless wide area network (WWAN), or an internet of things (I
  • OFDMA is an OFDM-based multiple access scheme where different subsets of subcarriers are allocated to different users, and this scheme allows simultaneous data transmission to or from one or more users.
  • OFDMA users are allocated different subsets of subcarriers that can change from one PPDU to the next. Similar to OFDM, OFDMA employs multiple subcarriers, but the subcarriers are divided into several groups where each group is referred to as a resource unit (RU).
  • RU resource unit
  • signaling include indicators regarding which subchannels include further signaling or which subchannels may be punctured.
  • PPDUs and related structures defined for current wireless communication protocols. As new wireless communication protocols enable enhanced features, new preamble designs are needed support signaling regarding features and resource allocations. Furthermore, it desirable to define a new preamble signaling protocol that can support future wireless communication protocols.
  • FIG. 1 shows a block diagram of an example wireless communication network.
  • a single AP 11 and an associated set of STAs 12 may be referred to as a basic service set (BSS), which is managed by the respective AP 11.
  • the BSS may be identified to users by a service set identifier (SSID), as well as to other devices by a basic service set identifier (BSSID), which may be a medium access control (MAC) address of the AP 11.
  • the AP 11 periodically broadcasts beacon frames (“beacons”) including the BSSID to enable any STAs 12 within wireless range of the AP 11 to “associate” or re-associate with the AP 11 to establish a respective communication link (hereinafter also referred to as a “Wi-Fi link”), or to maintain a communication link, with the AP 11.
  • beacon frames including the BSSID to enable any STAs 12 within wireless range of the AP 11 to “associate” or re-associate with the AP 11 to establish a respective communication link (hereinafter also referred to as a
  • the beacons can include an identification of a primary channel used by the respective AP 11 as well as a timing synchronization function for establishing or maintaining timing synchronization with the AP 11.
  • the AP 11 may provide access to external networks to various STAs 12 in the WLAN via respective communication link.
  • each of the STAs 12 is configured to perform passive or active scanning operations (“scans”) on frequency channels in one or more frequency bands (for example, the 2.4 GHz, 5 GHz, 6 GHz or 60 GHz bands).
  • scans passive or active scanning operations
  • a STA 12 listens for beacons, which are transmitted by respective APs 11 at a periodic time interval referred to as the target beacon transmission time (TBTT) (measured in time units (TUs) where one TU may be equal to 1024 microseconds ( ⁇ s)).
  • TBTT target beacon transmission time
  • TUs time units
  • ⁇ s microseconds
  • Each STA 12 may be configured to identify or select an AP 11 with which to associate based on the scanning information obtained through the passive or active scans, and to perform authentication and association operations to establish a communication link with the selected AP 11.
  • the AP 11 assigns an association identifier (AID) to the STA 12 at the culmination of the association operations, which the AP 11 uses to track the STA 104.
  • AID association identifier
  • STAs 12 may form networks without APs 11 or other equipment other than the STA.
  • a network is an ad hoc network (or wireless ad hoc network).
  • Ad hoc networks may alternatively be referred to as mesh networks or peer-to-peer (P2P) networks.
  • P2P peer-to-peer
  • ad hoc networks may be implemented within a larger wireless network such as the WLAN 10.
  • the STAs 12 may be capable of communicating with each other through the AP 11 using communication links, STAs 12 also can communicate directly with each other via direct wireless links. Additionally, two STAs 12 may communicate via a direct communication link regardless of whether both STAs 12 are associated with and served by the same AP 11.
  • one or more of the STAs 12 may assume the role filled by the AP 11 in a BSS.
  • Such a STA may be referred to as a group owner (GO) and may coordinate transmissions within the ad hoc network.
  • GO group owner
  • the AP 11 and STAs 12 in the WLAN 10 may transmit PPDUs over an unlicensed spectrum, which may be a portion of spectrum that includes frequency bands traditionally used by Wi-Fi technology, such as the 2.4 GHz band, the 5 GHz band, the 60 GHz band, the 3.6 GHz band, and the 900 MHz band. Some implementations of the AP 11 and STAs 12 described herein also may communicate in other frequency bands, such as the 6 GHz band, which may support both licensed and unlicensed communications. The AP 11 and STAs 12 also can be configured to communicate over other frequency bands such as shared licensed frequency bands, where multiple operators may have a license to operate in the same or overlapping frequency band or bands.
  • Each of the frequency bands may include multiple channels (which may be used as subchannels of a larger bandwidth channel).
  • PPDUs conforming to the IEEE 802.11n, 802.11ac and 802.11ax standard may be transmitted over the 2.4 and 5 GHz bands, each of which is divided into multiple 20 MHz channels.
  • these PPDUs are transmitted over a physical channel having a minimum bandwidth of 20 MHz, but larger channels can be formed through channel bonding.
  • PPDUs may be transmitted over physical channels having bandwidths of 40 MHz, 80 MHz, 160 or 320 MHz by bonding together multiple 20 MHz channels (which may be referred to as subchannels).
  • Each PPDU is a composite structure that includes a PHY preamble and a payload in the form of a PHY service data unit (PSDU).
  • the information provided in the preamble may be used by a receiving device to decode the subsequent data in the PSDU.
  • the preamble fields may be duplicated and transmitted in each of the multiple component channels.
  • the PHY preamble may include both a first portion (or “legacy preamble”) and a second portion (or “non-legacy preamble”).
  • the first portion may be used for packet detection, automatic gain control and channel estimation, among other uses.
  • the first portion also may generally be used to maintain compatibility with legacy devices as well as non-legacy devices.
  • the format of, coding of, and information provided in the second portion of the preamble is based on the particular IEEE 802.11 protocol to be used to transmit the payload.
  • Uplink means that the signal (or message or PPDU) is transmitted by a STA to an AP
  • downlink means that the signal (or message or PPDU) is transmitted by the AP to one or more STAs.
  • FIG. 2 shows a block diagram of an example wireless communication device.
  • the wireless communication device 50 can be an example of a device for use in a STA such as one of the STAs 12 described above with reference to FIG. 1. In some implementations, the wireless communication device 50 can be an example of a device for use in an AP such as the AP 11 described above with reference to FIG. 1. The wireless communication device 50 is capable of transmitting (or outputting for transmission) and receiving wireless communications (for example, in the form of wireless packets).
  • the wireless communication device can be configured to transmit and receive packets in the form of PPDUs and/or medium access control (MAC) protocol data units (MPDUs) conforming to an IEEE 802.11 wireless communication protocol standard, such as that defined by the IEEE 802.11-2016 specification or amendments thereof including, but not limited to, 802.11ah, 802.11ad, 802.11ay, 802.11ax, 802.11az, 802.11ba and 802.11be.
  • MAC medium access control
  • the wireless communication device 50 can be, or can include, a chip, system on chip (SoC), chipset, package or device that includes one or more processor 51.
  • the processor 51 can include an intelligent hardware block or device such as, for example, a processing core, a processing block, a central processing unit (CPU), a microprocessor, a microcontroller, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD) such as a field programmable gate array (FPGA), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • the processor 51 processes information received through a transceiver 53, and processes information to be output through the transceiver 53 through the wireless medium.
  • the processor 806 may implement a physical (PHY) layer and/or a MAC layer configured to perform various operations related to the generation and transmission of PPDUs, MPDUs, frames or packets.
  • a memory 52 can include tangible storage media such as random-access memory (RAM) or read-only memory (ROM), or combinations thereof.
  • the memory 808 also can store non-transitory processor- or computer-executable software code containing instructions that, when executed by the processor 51, cause the wireless communication device 50 to perform various operations described herein for wireless communication, including the generation, transmission, reception and interpretation of PPDUs, MPDUs, frames or packets.
  • various functions of components disclosed herein, or various blocks or steps of a method, operation, process or algorithm disclosed herein can be implemented as one or more modules of one or more computer programs.
  • the transceiver 53 generally includes at least one radio frequency (RF) transmitter (or “transmitter chain”) for transmitting radio signals and at least one RF receiver (or “receiver chain”) for receiving radio signals.
  • RF transmitters and receivers may include various DSP circuitry including at least one power amplifier (PA) and at least one low-noise amplifier (LNA), respectively.
  • PA power amplifier
  • LNA low-noise amplifier
  • the RF transmitters and receivers may, in turn, be coupled to one or more antennas.
  • the wireless communication device 50 can include, or be coupled with, multiple transmit antennas (each with a corresponding transmit chain) and multiple receive antennas (each with a corresponding receive chain).
  • VHT Very high throughput
  • HE high efficiency
  • EHT extremely high throughput
  • EHT STA may be used to represent a STA supporting at least EHT.
  • EHT STA can further support VHT and/or HE.
  • Ultra High Reliability is used to represent any later (post-EHT) version of a new wireless communication protocol conforming to a future IEEE 802.11 wireless communication protocol standard or other standard, and is for illustration purpose only.
  • 'UHR' may be referred to as other terms, for example, Ultra Low Latency (ULL), High Reliability (HR), etc.
  • the UHR PPDU may support future amendments to the IEEE 802.11 wireless communication standard.
  • FIG. 3 shows an example of wireless channel that includes multiple subchannels.
  • a channel map for a frequency band may define multiple subchannels.
  • the channel width W may be smaller than or larger than 20 MHz.
  • the primary channel is the common channel of operation for all STAs that are members of the BSS.
  • the secondary channel is a channel associated with the primary channel used to create a channel wider than the primary channel.
  • the secondary 20 MHz channel adjacent to the primary 20 MHz channel that together form the primary 40 MHz channel of the 80 MHz BSS In 80 MHz BSS, the secondary 20 MHz channel adjacent to the primary 20 MHz channel that together form the primary 40 MHz channel of the 80 MHz BSS.
  • the secondary 80 MHz channel not including the primary 20 MHz channel that together with the primary 80 MHz channel including the primary 20 MHz channel form the 160 MHz or 80+80 MHz channel of the 160 MHz or 80+80 MHz BSS.
  • the secondary 160 MHz channel not including the primary 20 MHz channel which together with the primary 160 MHz channel including the primary 20 MHz channel form the 320 MHz channel of the 320 MHz BSS.
  • FIG. 4 shows an example of PPDU transmission.
  • the WLAN device would perform a clear channel assessment (CCA) before sending a non-triggered transmission.
  • CCA is a type of collision avoidance technique. Other types may be referred to as carrier sense, carrier detect, listen-before-talk.
  • CCA is performed by a WLAN device to determine if the wireless communication medium (such as the group of subchannels) is available or busy (by another transmission). If the wireless communication medium is in use, the WLAN device may postpone the transmission until the CCA is performed again and the wireless communication medium is idle by another device.
  • the punctured channel information may be indicated in a signal field (for example, HE-SIG-A, U-SIG, or EHT-SIG).
  • the punctured channel information may indicate which channels in the total bandwidth (such as 160 MHz or 320 MHz) are punctured, as well as the puncturing mode, such that the receiving STA knows which channels to process for information and which channels are punctured and thus not available or otherwise not including information for processing by the STA.
  • FIG. 5 shows an example of UL MU transmission.
  • the AP may send a trigger frame to one or more STAs (for example, STA1 and STA2).
  • the trigger frame may be sent as MU PPDU (for example, HE MU PPDU or EHT MU PPDU).
  • the STA1 and STA2 may send response PDUs (for example, HE TB PPDU or EHT TB PPDU) in response to the trigger frame.
  • the interframe space between a PPDU that contains a triggering frame and the TB PPDU is a Short Interframe Space (SIFS).
  • SIFS Short Interframe Space
  • the AP sends an Ack or BlockAck frame acknowledging the one or more TB PPDUs to the response STAs (for example, STA1 and STA2).
  • the trigger frame allocates resources for and solicits one or more PPDU transmissions.
  • the trigger frame also carries other information required by the responding STA to send a TB PPDU or a non-HT PPDU.
  • the trigger frame may be sent as various types such as a basic trigger frame, multi-user request to send (MU-RTS) frame, multi-user block ack request (MU-BAR) frame, Beamforming Report Poll (BFRP) Trigger frame, etc.
  • the trigger frame may include a UL bandwidth field, an CS required field, one or more STA IDs and one or more resource unit (RU) Allocation field.
  • the UL bandwidth field indicates the bandwidth of the response PPDU.
  • the CS required field indicate whether the response STAs are required to use energy detection (ED) to sense the medium and to consider the medium state and the network allocation vector (NAV) in determining whether or not to respond.
  • the one or more STA IDs identifies the one or more response STAs.
  • the RU Allocation subfield indicates RU allocation for the response PPDU.
  • a NAV is an indicator, maintained by each STA, of time periods when transmission onto the wireless medium (WM) is not initiated by the STA regardless of whether the STA's clear channel assessment (CCA) function senses that the WM is busy.
  • Transmission opportunity (TXOP) is an interval of time during which a particular STA has the right to initiate frame exchange sequences onto the WM.
  • a TXOP holder or a TXOP owner is a STA that has either been granted a TXOP or successfully contended for a TXOP.
  • a TXOP responder is a STA that transmits a frame in response to a frame received from the TXOP holder during a frame exchange sequence, but that does not acquire a TXOP in the process.
  • the TXOP sharing allows an AP to allocate a portion of an obtained TXOP to an associated non-AP STA and/or another AP for transmitting one or more frames (or one or more PPDUs).
  • a sharing AP is an AP that obtains a TXOP and share the TXOP with a peer AP.
  • a shared AP is the peer AP that uses a portion of the TXOP obtained by the sharing AP.
  • the sharing AP and the shared AP may have same or different operating bandwidths.
  • the sharing AP and the shared AP may have same or different primary channels.
  • the sharing AP and the shared AP may have same or different primary 20 MHz channels.
  • AP1 is a shared AP and STA1 is a STA associated with AP1.
  • AP2 is a shared AP and STA2 is a STA associated with AP2.
  • FIG. 6 shows an example of sharing TXOP according to an embodiment of the present disclosure.
  • AP1 and AP2 has same 160 MHz operating bandwidths and has same primary 80 MHz channels. After performing backoff procedure, AP1 obtains a TXOP.
  • AP1 can initiate a frame exchange with STA1 associated with AP1 within the TXOP. For example, AP1 sends a MU-RTS trigger frame to STA1. STA1 sends a clear-to-send (CTS) frame as a response to the MU-RTS. AP1 send a data frame to STA1. STA1 sends a BlockAck (BA) to acknowledge the data frame.
  • CTS clear-to-send
  • BA BlockAck
  • AP1 can share AP1's TXOP with AP2.
  • AP1 may allocate time within the obtained TXOP to AP2 by transmitting an MU-RTS triggered TXOP sharing (TXS) trigger frame.
  • TXS TXOP sharing
  • the MU-RTS TXS trigger frame can indicate resources (an allocated time, an allocated bandwidth, and/or an access category) allocated within the TXOP.
  • the allocated time to the shared AP within the sharing AP's TXOP can be called as a shared TXOP duration.
  • the time allocation can start from the end of the PPDU that contains the MU-RTS TXS trigger frame.
  • the shared AP can initiate a frame exchange with a STA associated with the shared AP.
  • AP1 can determine that its transmission of the MU-RTS TXS trigger frame to AP2 is successful when AP1 receives a response frame (for example, CTS frame or CTS-to-self frame) from AP2 in response to the MU-RTS TXS trigger frame.
  • a response frame for example, CTS frame or CTS-to-self frame
  • AP2 cannot transmit any PPDU occupying subchannels that are not used when sending the response frame in response to the MU-RTS TXS trigger frame.
  • AP1 may transmit a PPDU within the shared TXOP duration if at least one of the following conditions are satisfied: (i) AP2 sends to AP1 a frame indicating a return of the shared TXOP duration, and (ii) the PPDU carries an immediate response that is solicited by AP2.
  • AP1 can transmit a PPDU after Point coordination function Interframe Space (PIFS) after the end of the shared TXOP duration when the WM is determined to be idle by the CS mechanism at the end of the shared TXOP duration.
  • PIFS Point coordination function Interframe Space
  • AP2 can initiate a frame exchange with STA2 associated with AP2 within the TXOP after sending CTS frame.
  • AP2 can use the shared TXOP duration allocated in the MU-RTS TXS trigger frame, which is addressed to AP2 and that indicates TXOP sharing of AP2, for the transmission of one or more PPDUs to another STA.
  • AP2 can update AP2's access category within the shared TXOP duration according to the resource information in the MU-RTS TXS trigger frame.
  • AP2 After sending the CTS solicited by the MU-RTS TXS Trigger frame, AP2 can set the Duration field of its frame(s) to a value that indicates a time no later than the ending time of the PPDU carrying the MU-RTS TXS Trigger frame plus the shared TXOP duration.
  • a receiver address (RA) field is set to a broadcast address when the trigger frame is an MU-RTS frame.
  • a transmitter address (TA) field can be set to the address of the STA transmitting the trigger frame if the trigger frame is addressed to STAs that belong to a single BSS.
  • the TA field can be set to the transmitted BSSID if the trigger frame is addressed to STAs from at least two different BSSs of the multiple BSSID set.
  • the BSSID that carries the Multiple BSSID element is called a transmitted BSSID, and the BSSIDs carried by the Multiple BSSID element are known as the nontransmitted BSSIDs.
  • the multiple BSSID set can be included in the Multiple BSSID element.
  • the BSSID carried in the beacon frame that includes the Multiple BSSID element is the transmitted BSSID.
  • the nontransmitted BSSID can be derived from the multiple BSSID set.
  • the TXS mode subfield can be set to a fourth value (e.g., 3) to indicate that the MU-RTS initiates TXOP sharing procedure wherein a shared AP can transmit PPDU(s) addressed to its associated STA.
  • a fourth value e.g. 3
  • An MU-RTS trigger frame that has the TXS Mode subfield not set to the first value can be called an MU-RTS TXS trigger frame.
  • An AID subfield of the MU-RTS TXS trigger frame indicates a shared AP or a non-AP STA to share TXOP.
  • the Allocation Duration subfield in the MU-RTS TXS trigger frame can indicate the time allocated to the shared AP or the non-AP STA within the TXOP obtained by the AP.
  • the Access Category subfield in the MU-RTS TXS trigger frame can indicate the access category allocated to the shared AP or the non-AP STA within the TXOP.
  • B0 of the RU Allocation subfield is set to 0 to indicate a primary 20 MHz channel, primary 40 MHz channel and primary 80 MHz channel.
  • B0 of the RU Allocation subfield is set to 1.
  • a PS160 subfield is set to 1 to indicate a 320 MHz channel and set to 0 to indicate a primary 20 MHz channel, primary 40 MHz channel, primary 80 MHz channel, and primary 160 MHz channel.
  • B7-B1 of the RU Allocation subfield is set to 68 to indicate the primary and secondary 80 MHz channel if the bandwidth of the PPDU that carries the MU-RTS TXS Trigger frame is less than 320 MHz, or to indicate the primary 160 MHz channel if the bandwidth of the PPDU that carries the MU-RTS TXS Trigger frame is 320 MHz.
  • B7-B1 of the RU Allocation subfield is set to 69 to indicate a 320 MHz channel.
  • the MU-RTS TXS trigger frame can include a bandwidth subfield indicating a bandwidth of the PPDU carrying the MU-RTS TXS trigger frame.
  • FIG. 8 shows another example of sharing TXOP according to an embodiment of the present disclosure.
  • the shared AP can send the CTS frame only when all channels in the allocated TXOP bandwidth signaled by the MU-RTS TXS trigger frame are idle.
  • CCA of the primary 40 MHz channel indicates idle during a specific interval (e.g., SIFS) after receiving MU-RTS TXS trigger frame, but CCA of the secondary 40 MHz channel indicates busy.
  • AP2 can send the CTS frame on the idle primary 40 MHz channel.
  • the CTS can include available bandwidth information on the idle primary 40 MHz channel.
  • AP2 can initiate a frame exchange within the available bandwidth.
  • the shared AP can utilize the TXOP within the part or all of the TXOP bandwidth allocated by the sharing AP.
  • FIG. 9 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • AP1 sends an MU-RTS TXS trigger frame to AP2 for sharing TXOP.
  • a TXOP bandwidth allocated by the MU-RTS TXS trigger frame is 80 MHz.
  • AP2 sends a CTS frame (or a CTS-to-self frame) in response to the MU-RTS TXS trigger frame.
  • CCA of the primary 80 MHz channel indicates idle during a specific interval (e.g., SIFS) after receiving MU-RTS TXS trigger frame
  • CCA of the secondary 80 MHz channel also indicated idle during a specific interval (e.g., PIFS) immediately preceding the start of the CTS frame transmission.
  • AP2 can send the CTS frame over 160 MHz channel which is not covered by the TXOP bandwidth.
  • the CTS can include available bandwidth information on the 160 MHz channel.
  • AP2 can initiate a frame exchange within the available bandwidth.
  • a SIFS or a longer sensing interval can be used to check CCA of one or more channels.
  • FIG. 10 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • the AP1 sends an MU-RTS TXS trigger frame to AP2 for sharing TXOP.
  • the sharing AP operates on one or more punctured channels
  • the MU-RTS TXS Trigger frame addressed to the shared AP can also follow the same channel puncturing pattern of the sharing AP.
  • the CTS frame, which serves as a response to the MU-RTS TXS Trigger frame, can adhere to the same channel puncturing as well.
  • the transmit power of the CTS frame can be constrained by the transmit power envelope element information provided by the sharing AP.
  • the CTS frame is solicited by the sharing AP to the same channel puncturing pattern as the sharing AP.
  • the shared AP can use the shared AP's puncturing pattern.
  • Data frame and/or response frame used by AP2 and STA2 can adhere to the channel puncturing pattern of AP2.
  • FIG. 11 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • a sharing AP can initiate spatial reuse with one or more shared APs.
  • the sharing AP sends an MU-RTS TXS trigger frame to one or more shared APs.
  • the MU-RTS TXS trigger frame includes information a spatial reuse for the one or more shared APs.
  • Each of the shared APs indicated in the MU-RTS TXS Trigger can send a CTS response in response to the MU-RTS TXS Trigger frame if the CCA indicate idle after receiving the MU-RTS TXS Trigger frame.
  • the bandwidth of each CTS frame can be less than or equal to the allocated TXOP bandwidth signaled by the RU Allocation subfield in the MU-RTS TXS Trigger frame.
  • the shared APs can transmit PPDUs SIFS after the CTS response.
  • the shared APs may not set NAV based on the MU-RTS TXS Trigger frame.
  • AP1 obtains a TXOP and sends an MU-RTS TXS trigger frame to AP2 and AP3 to share the TXOP using the spatial reuse. For example, if AP1 supports 4 spatial streams, AP1 uses 2 spatial streams and shares remaining 2 spatial streams with AP2 and AP3 within the TXOP.
  • AP2 detects that CCA of the primary 80 MHz channel is idle, and sends a CTS frame over the primary 80 MHz channel.
  • AP2 can initiate frame exchange with a STA associated with the AP2 over the primary 80 MHz channel.
  • AP3 detects that CCA of the primary 40 MHz channel is idle but CCA of the secondary 40 MHz channel is busy, and sends a CTS frame over the primary 40 MHz channel.
  • AP3 can initiate frame exchange with a STA associated with the AP3 over the primary 40 MHz channel.
  • FIG. 12 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • a shared AP can utilize a transmission bandwidth wider than the TXOP bandwidth allocated by the MU-RTS TXS trigger frame.
  • the shared AP can send a CTS frame with same TXOP bandwidth.
  • AP1 obtains a TXOP and sends an MU-RTS TXS trigger frame to AP2 and AP3 to share the TXOP using the spatial reuse.
  • the shared AP can use the idle secondary channel during the shared TXOP duration.
  • secondary channels e.g., secondary 40 MHz channel, secondary 80 MHz channel, secondary 160 MHz channel
  • a specific interval e.g., SIFS or PIFS
  • FIG. 13 shows still another example of sharing TXOP according to an embodiment of the present disclosure.
  • a sharing AP can initiate spatial reuse with one or more shared APs.
  • the sharing AP sends the MU-RTS TXS trigger frame to one or more shared APs.
  • a STA associated with the sharing AP can send a CTS frame in response to the MU-RTS TXS trigger frame.
  • the shared APs indicated in the MU-RTS TXS Trigger do not send any CTS frame.
  • the shared AP may obtain a TXOP after completing the back-off procedure.
  • the MU-RTS TXS Trigger frame for spatial reuse can contains the energy detection (ED) threshold of the shared AP, which is used for the back-off procedure during the shared TXOP duration for the sharing AP.
  • ED energy detection
  • the shared AP do not set NAV based on the MU-RTS TXS Trigger frame, and may disregard a preamble detection from a PPDU sent by other shared AP.
  • FIG. 14 shows still another example of sharing TXOP according to an embodiment of the present disclosure.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un point d'accès de partage (AP) obtient une opportunité de transmission (TXOP) et transmet une trame de déclenchement de demande d'envoi multi-utilisateur (MU-RTS) à un AP partagé. La trame de déclenchement MU-RTS déclenche un échange de trame entre l'AP partagé et une station associée à l'AP partagé dans la TXOP.
PCT/KR2024/013313 2023-09-07 2024-09-04 Dispositif et procédé de partage d'opportunité de transmission Pending WO2025053601A1 (fr)

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KR10-2023-0118889 2023-09-07
KR20230118889 2023-09-07

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022212468A1 (fr) * 2021-03-30 2022-10-06 Interdigital Patent Holdings, Inc. Trame de déclenchement améliorée et ses variantes
CN116349188A (zh) * 2020-09-01 2023-06-27 交互数字专利控股公司 用于wlan系统的多ap建立和传输程序
WO2023136398A1 (fr) * 2022-01-12 2023-07-20 엘지전자 주식회사 Procédé et appareil ayant une signalisation optimisée par l'intermédiaire d'une trame de demande de sondage ml afin d'empêcher la réception en double d'informations de mise à jour importantes dans un système lan sans fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116349188A (zh) * 2020-09-01 2023-06-27 交互数字专利控股公司 用于wlan系统的多ap建立和传输程序
WO2022212468A1 (fr) * 2021-03-30 2022-10-06 Interdigital Patent Holdings, Inc. Trame de déclenchement améliorée et ses variantes
WO2023136398A1 (fr) * 2022-01-12 2023-07-20 엘지전자 주식회사 Procédé et appareil ayant une signalisation optimisée par l'intermédiaire d'une trame de demande de sondage ml afin d'empêcher la réception en double d'informations de mise à jour importantes dans un système lan sans fil

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LIWEN CHU (NXP): "extended TXOP sharing", IEEE DRAFT; 11-23-0249-01-0UHR-EXTENDED-TXOP-SHARING, vol. 802.11 UHR, no. 1, 8 May 2023 (2023-05-08), Piscataway, NJ USA, pages 1 - 12, XP068202427 *
SANGHYUN KIM (WILUS): "Non-AP initiated TXOP sharing", IEEE DRAFT; 11-23-0581-00-0UHR-NON-AP-INITIATED-TXOP-SHARING, vol. 802.11 UHR, no. 0, 14 April 2023 (2023-04-14), Piscataway, NJ USA, pages 1 - 14, XP068202214 *

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