WO2015109603A1 - Procédé et dispositif pour concurrence d'accès au canal - Google Patents

Procédé et dispositif pour concurrence d'accès au canal Download PDF

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Publication number
WO2015109603A1
WO2015109603A1 PCT/CN2014/071585 CN2014071585W WO2015109603A1 WO 2015109603 A1 WO2015109603 A1 WO 2015109603A1 CN 2014071585 W CN2014071585 W CN 2014071585W WO 2015109603 A1 WO2015109603 A1 WO 2015109603A1
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WO
WIPO (PCT)
Prior art keywords
sta
frame
channel
bss
rts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/071585
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English (en)
Chinese (zh)
Inventor
刘亚林
朱俊
张佳胤
伍天宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2014/071585 priority Critical patent/WO2015109603A1/fr
Priority to CN201480072339.0A priority patent/CN105900513B/zh
Priority to PCT/CN2014/092132 priority patent/WO2015109890A1/fr
Priority to CN202110687347.8A priority patent/CN113473621B/zh
Priority to EP20199227.8A priority patent/EP3826420B1/fr
Priority to EP14879647.7A priority patent/EP3094150B1/fr
Priority to EP23189115.1A priority patent/EP4290976A3/fr
Priority to ES14879647T priority patent/ES2855125T3/es
Publication of WO2015109603A1 publication Critical patent/WO2015109603A1/fr
Priority to US15/220,258 priority patent/US10149322B2/en
Anticipated expiration legal-status Critical
Priority to US16/124,876 priority patent/US10827527B2/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04W88/02—Terminal devices

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a method and apparatus for competing channels. Background technique
  • the Media Access Control (MAC) layer uses Carrier Sense Multiple Access (CSMA)/conflict. Collision Avoidance (CA) protocol avoids conflicts on the channel when multiple network devices need to transmit data.
  • CSMA/CA protocol network devices that need to send data compete for channels.
  • the scheduling mode has become a high-efficiency wireless local area network (High Efficiency WLAN, referred to as HEW).
  • HEW High Efficiency WLAN
  • the basic service set (Basic Service Set (BSS) is used as the basis for the scheduling set.
  • BSS Basic Service Set
  • the success rate is low according to the CSMA/CA protocol.
  • an embodiment of the present invention provides a device for competing a channel, where the device belongs to a basic service set BSS, where the BSS includes an access point AP and at least one first station STA, and the AP and at least one of the foregoing A STA is involved in a contention channel, and the device is the AP or any one of the first STAs, and the device includes:
  • a listening module configured to listen to a channel
  • the contention module configured to compete for the channel, perform centralized control scheduling by the AP, so that at least one of the network devices in the BSS can use the channel to transmit data.
  • the contention module is specifically configured to:
  • the listening module When the listening module detects that the channel is in an idle state, it competes for the channel by successfully transmitting a channel contention frame.
  • the channel contention frame is a sending request RTS frame, where the RTS frame includes a transmission duration, a receiving end address RA and a sending end address TA, where the transmission duration is a scheduling duration required by the network device in the BSS, and the RA is an identifier pre-agreed by the AP and the at least one first STA information.
  • the device is the AP, and the AP further includes a scheduling module; Competition module, specifically for:
  • the listening module When the listening module detects that the channel is in an idle state, it successfully contends for one of the RTS frames to compete for the channel, and the TA in the RTS frame is an address of the AP;
  • the at least one first STA is configured to learn channel success according to the RTS frame, and continue to listen to the channel to receive a control frame sent by the AP for controlling data transmission; Obtaining that the channel is occupied according to the RTS frame, and performing a contention retreat according to the network allocation vector NAV of the transmission duration in the RTS frame, where the second STA is a site that does not belong to the BSS;
  • the scheduling module is configured to send the control frame, so that the at least one first STA performs data transmission.
  • a receiving module configured to receive a CTS frame that is sent by the at least one first STA.
  • the device is any one of the first STAs in the BSS, where the first STA is The contention module is specifically configured to:
  • the listening module When the listening module detects that the channel is in an idle state, it successfully contends to the channel by successfully sending one of the RTS frames, and the TA in the RTS frame is an address of the AP or successfully sends the The address of the first STA of the RTS; And the other first STAs learn channel success according to the RTS frame by using the RTS frame, and the at least one first STA continues to listen to the channel to receive a control frame sent by the AP for controlling data transmission,
  • the other first STA is a first STA of the BSS except the first STA that successfully sends one of the RTS frames, and the second STA learns that the channel is occupied according to the RTS frame.
  • the AP And performing a contention retreat according to the network allocation vector NAV of the transmission duration in the RTS frame, where the second STA is a station that does not belong to the BSS; and the AP sends the control frame to enable the The at least one first STA performs data transmission.
  • the device is any one of the first STAs in the BSS, where the first STA is
  • the contention module is specifically configured to:
  • the RTS frame contends to the channel, and the TA in the RTS frame is an address of the AP or an address of the first STA that successfully sends the RTS;
  • the STA continues to listen to the channel to receive a control frame sent by the AP for controlling data transmission, where the other first STA is the first STA in the BSS except that one RTS frame is successfully sent.
  • the first STA is configured to enable the second STA to learn that the channel is occupied according to the RTS frame or the CTS frame, and set its own network allocation according to the RTS frame or the transmission duration in the CTS frame.
  • the vector NAV performs a contention retreat, and the second STA is a station that does not belong to the BSS; the AP is caused to send the control frame, so that the at least one first STA performs data transmission.
  • the channel contention frame is allowed to send a CTS frame
  • the CTS frame includes frame control information.
  • the transmission duration, the receiver address RA, and the frame control sequence FCS information where the transmission duration is a scheduling duration required by the network device in the BSS, and the RA is the AP and the at least one first STA pre-agreed identification information.
  • the device is the AP, and the AP further includes a scheduling module; Competition module, specifically for: When the listening module detects that the channel is in an idle state, successfully transmitting one of the
  • the at least one first STA is configured to learn channel success according to the CTS frame, and continue to listen to the channel to receive a control frame sent by the AP for controlling data transmission; Obtaining that the channel is occupied according to the CTS frame, and performing a contention retreat according to the network allocation vector NAV of the transmission time length in the CTS frame, where the second STA is a site that does not belong to the BSS;
  • the scheduling module is configured to send the control frame, so that the at least one first STA performs data transmission.
  • a receiving module configured to receive a CTS frame that is sent by the at least one first STA.
  • the device is any one of the first STAs in the BSS, where the first STA is
  • the contention module is specifically configured to:
  • the listening module When the listening module detects that the channel is in an idle state, it successfully contends to the channel by successfully transmitting one CTS frame;
  • the other first STA is a first STA of the BSS except the first STA that successfully sends one CTS frame; and the second STA learns that the channel is occupied according to the CTS frame.
  • the device is any one of the first STAs in the BSS, the first STA
  • the competition module is specifically used for:
  • the listening module When the listening module detects that the channel is in an idle state, it successfully contends to the channel by successfully transmitting one CTS frame;
  • the AP Passing, by the CTS frame, the AP to reply to the at least one first STA for Feeding the CTS frame; causing the other first STA to learn that the channel competition succeeds according to the CTS frame or the CTS frame for feedback, the at least one first STA continues to listen to the channel to receive the AP for sending a control frame for controlling data transmission, where the other first STA is a first STA of the BSS except for the first STA that successfully sends one CTS frame; and the second STA is configured according to the CTS frame.
  • the CTS frame for feedback learns that the channel is occupied, and performs a contention retreat according to the CTS frame or the transmission time length in the CTS frame for feedback setting its own network allocation vector NAV,
  • the second STA is a station that does not belong to the BSS; the AP is caused to send the control frame, so that the at least one first STA performs data transmission.
  • the device is any one of the first STAs in the BSS,
  • the contention module of the first STA is specifically configured to:
  • the listening module When the listening module detects that the channel is in an idle state, it successfully sends a helper AP to send an HTS frame to the channel, and the HTS frame includes a transmission duration, a receiver address RA, and a sender address TA, where The transmission duration is a scheduling duration required by the network device in the BSS, and the RA is identifier information pre-agreed by the AP and the at least one first STA, where the TA is the AP and the Defining the identification information pre-agreed by the at least one first STA;
  • the RA in the HTS frame is a media access control MAC of the AP
  • the address, the TA in the HTS frame is a MAC address of the first STA that successfully sends the RTS, a MAC address of the AP, or an identifier BSSID of the BSS.
  • the device is any one of the first STAs in the BSS
  • the contention module of the first STA is specifically configured to:
  • the listening module When the listening module detects that the channel is in an idle state, it successfully contends to the channel by successfully transmitting an HTS frame, where the HTS frame includes a transmission duration and a receiving end address RA, where the transmission duration is the The scheduling time required by the network device in the BSS, where the RA is the identification information pre-agreed by the AP and the at least one first STA;
  • the RA in the HTS frame is a media access control MAC address of the AP.
  • the AP is sent to all the at least one first STA
  • the information the RA in the RTS frame sent by the AP is a BSSID, and the TA in the RTS frame sent by the AP is a MAC address of the AP; or
  • the RA in the RTS frame sent by the AP is a group number of a group to which the at least one first STA belongs.
  • the TA in the RTS frame sent by the AP is a MAC address of the AP.
  • an embodiment of the present invention provides a method for competing for a channel, including: The first device in the basic service set BSS listens to the channel, the BSS includes an access point AP and at least one first station STA, and the first device is the AP or any one of the first STAs; An apparatus contending for the channel, performing centralized control scheduling by the AP, so that at least one network device in the BSS can use the channel to transmit data, where the AP and the at least one first STA participate in a contention channel.
  • the first device that competes with the channel includes:
  • the first device detects that the channel is in an idle state, and competes to the channel by successfully transmitting a channel contention frame.
  • the channel contention frame is a sending request RTS frame, where the RTS frame includes a transmission duration, a receiving end address RA and a sending end address TA, where the transmission duration is a scheduling duration required by the network device in the BSS, and the RA is an identifier pre-agreed by the AP and the at least one first STA information.
  • the first device is the AP, and the first device contends the channel, by using the The AP performs centralized control scheduling to enable at least one network device in the BSS to transmit data using the channel, including:
  • the AP detects that the channel is in an idle state, and successfully transmits one RTS frame to the channel, and the TA in the RTS frame is an address of the AP;
  • the at least one first STA is configured to learn channel success according to the RTS frame, and continue to listen to the channel to receive a control frame sent by the AP for controlling data transmission; Obtaining that the channel is occupied according to the RTS frame, and performing a contention retreat according to the network allocation vector NAV of the transmission duration in the RTS frame, where the second STA is a site that does not belong to the BSS;
  • the first device is any one of the first STAs in the BSS, the first The device contends for the channel, and performs centralized control scheduling by the AP, so that at least one network device in the BSS can use the channel to transmit data, including: The first STA of any one of the BSSs is in the idle state, and the TA is successfully advertised to the channel by the RTS frame, and the TA in the RTS frame is the AP. Address or the address of the first STA that successfully sends the RTS;
  • the other first STAs learn channel success according to the RTS frame by using the RTS frame, and the at least one first STA continues to listen to the channel to receive a control frame sent by the AP for controlling data transmission
  • the other first STA is a first STA of the BSS except the first STA that successfully sends one of the RTS frames, and the second STA learns that the channel is occupied according to the RTS frame.
  • the first device is any one of the first STAs in the BSS, the first The device contends for the channel, and performs centralized control scheduling by the AP, so that at least one network device in the BSS can use the channel to transmit data, including:
  • the first STA of any one of the BSSs is in the idle state, and the TA is successfully advertised to the channel by the RTS frame, and the TA in the RTS frame is the AP. Address or the address of the first STA that successfully sends the RTS;
  • the first STA is configured to enable the second STA to learn that the channel is occupied according to the RTS frame or the CTS frame, and set its own network allocation vector according to the RTS frame or the transmission duration in the CTS frame.
  • the NAV performs a contention retreat, where the second STA is a station that does not belong to the BSS; and the AP sends the control frame to enable the at least one first STA to perform data transmission.
  • the channel contention frame is allowed to send a CTS frame, where the CTS frame includes a transmission duration and a receiving end address RA, where the transmission duration is a scheduling duration required by the network device in the BSS, and the RA is an advance of the AP and the at least one first STA. Identification information.
  • the first device is the AP, and the first device contends the channel, by using the The AP performs centralized control scheduling to enable at least one network device in the BSS to transmit data using the channel, including:
  • the AP detects that the channel is in an idle state, and successfully competes to send the CTS frame to the channel;
  • the at least one first STA is configured to learn channel success according to the CTS frame, and continue to listen to the channel to receive a control frame sent by the AP for controlling data transmission; Obtaining that the channel is occupied according to the CTS frame, and performing a contention retreat according to the network allocation vector NAV of the transmission time length in the CTS frame, where the second STA is a site that does not belong to the BSS;
  • the first device is any one of the first STAs in the BSS, the first The device contends for the channel, and performs centralized control scheduling by the AP, so that at least one network device in the BSS can use the channel to transmit data, including:
  • the first STA of any one of the BSSs hears that the channel is in an idle state, and competes to the channel by successfully transmitting one CTS frame;
  • the other first STA is a first STA of the BSS except the first STA that successfully sends one CTS frame; and the second STA learns that the channel is occupied according to the CTS frame.
  • the first device is any one of the first STAs in the BSS, the first The device contends for the channel, and performs centralized control scheduling by the AP, so that at least one network device in the BSS can use the channel to transmit data, including: The first STA of any one of the BSSs hears that the channel is in an idle state, and competes to the channel by successfully transmitting one CTS frame;
  • the AP Passing, by the CTS frame, the AP to reply to the at least one first STA with a CTS frame for feedback; and causing other first STAs to learn that the channel competition succeeds according to the CTS frame or the CTS frame for feedback
  • the at least one first STA continues to listen to the channel to receive a control frame sent by the AP for controlling data transmission, where the other first STA is the CTS except for successfully transmitting the CTS.
  • a first STA outside the first STA of the frame causing the second STA to learn that the channel is occupied according to the CTS frame or the CTS frame for feedback, and according to the CTS frame or the
  • the transmission time length in the fed back CTS frame sets its own network allocation vector NAV to perform contention backoff, and the second STA is a station that does not belong to the BSS; causing the AP to send the control frame, so that the at least A first STA performs data transmission.
  • the first device is any one of the first STAs in the BSS,
  • the first device contends for the channel, and performs centralized control scheduling by the AP, so that at least one network device in the BSS can use the channel to transmit data, including:
  • the first STA of the BSS detects that the channel is in an idle state, and successfully sends a help AP to send an HTS frame to contend to the channel, where the HTS frame includes a transmission duration, a receiver address RA, and a sending end address TA, where the transmission duration is a scheduling duration required by the network device in the BSS, and the RA is identifier information pre-agreed by the AP and the at least one first STA, the TA Identification information pre-agreed by the AP and the at least one first STA;
  • the AP sending, by the HTS frame, the AP to the at least one first STA to send an RTS frame or a CTS frame; and causing other first STAs to learn that the channel competition succeeds according to the RTS frame, where the at least one first STA simultaneously replies a CTS frame, and continues to listen to the channel to receive a control frame sent by the AP for controlling data transmission, where the other first STA is the one of the BSS except for successfully transmitting one of the RTS frames a first STA outside the first STA; causing the second STA to learn that the channel is occupied according to the HTS frame, the RTS frame, or the CTS frame, and according to the HTS frame, the RTS frame, or the The transmission duration in the CTS frame sets its own network allocation vector NAV to perform contention backoff, and the second STA is a station that does not belong to the BSS; And causing the AP to send the control frame, so that the at least one first STA performs data transmission.
  • the RA in the HTS frame is a media access control MAC address of the AP, where The TA in the HTS frame is a MAC address of the first STA that successfully sends the RTS, a MAC address of the AP, or an identifier BSSID of the BSS.
  • the first device is any one of the BSSs And the first device contending for the channel, and performing centralized control scheduling by the AP, so that at least one network device in the BSS can use the channel to transmit data, including:
  • the first STA of the BSS detects that the channel is in an idle state, and contends to the channel by successfully transmitting an HTS frame, where the HTS frame includes a transmission duration and a receiver address RA, where The transmission duration is the scheduling duration required by the network device in the BSS, and the RA is the identification information pre-agreed by the AP and the at least one first STA.
  • the AP is forwarded by using the HTS frame. Transmitting, by the at least one first STA, an RTS frame or a CTS frame, the other first STAs, according to the RTS frame, that the channel competition is successful, the at least one first STA simultaneously replies to the CTS frame, and continues to listen to the channel.
  • a control frame for controlling data transmission where the other first STA is a first STA of the BSS except for the first STA that successfully sends one of the RTS frames;
  • the second STA learns that the channel is occupied according to the HTS frame, the RTS frame, or the CTS frame, and sets the transmission duration according to the HTS frame, the RTS frame, or the CTS frame.
  • the NAV performs a contention retreat, and the second STA is a station that does not belong to the BSS; and the AP sends the control frame to enable the at least one first STA to perform data transmission.
  • the RA in the HTS frame is a media access control MAC address of the AP.
  • the AP sends information to all the at least one first STA And the RA in the RTS frame sent by the AP is a BSSID, and the TA in the RTS frame sent by the AP is a MAC address of the AP; or
  • the RA in the RTS frame sent by the AP is a group number of the group to which the at least one first STA belongs, and the TA in the RTS frame sent by the AP is a MAC address of the AP.
  • all the network devices in the BSS of the WLAN system including the AP and the STA, all participate in the contention channel, and after any one of the cells competes for the channel, the AP can perform centralized control scheduling on the network devices, so that In the subsequent period of time, all network devices in the BSS can use the contention channel to transmit data without having to compete again, which improves the network device channel competition success rate and data transmission efficiency in the BSS.
  • Figure 1 is a schematic diagram of the collision avoidance mechanism of the CSMA/CA protocol
  • Embodiment 1 is a schematic structural diagram of Embodiment 1 of a device for competing channels according to the present invention
  • FIG. 3 is a schematic diagram of an RTS frame format
  • Figure 4 is a schematic diagram of a CTS frame format
  • FIG. 5 is a schematic diagram of a device application scenario of a contention channel
  • Embodiment 2 is a schematic structural diagram of Embodiment 2 of a device for competing channels according to the present invention.
  • Embodiment 7 is a schematic structural diagram of Embodiment 3 of a device for competing channels according to the present invention.
  • 8A is a schematic diagram 1 of a competition mechanism of a device for competing channels according to the present invention.
  • 8B is a second schematic diagram of a contention mechanism of a device for competing channels according to the present invention.
  • 8C is a third schematic diagram of a competition mechanism of a device for competing channels according to the present invention.
  • 8D is a fourth schematic diagram of a contention mechanism of a device for competing channels according to the present invention.
  • 8E is a schematic diagram 5 of a competition mechanism of a device for competing channels according to the present invention.
  • 8F is a schematic diagram 6 of a competition mechanism of a device for competing channels according to the present invention.
  • Embodiment 9 is a flowchart of Embodiment 1 of a method for competing for a channel according to the present invention.
  • Embodiment 10 is a flowchart of Embodiment 2 of a method for competing a channel according to the present invention
  • FIG. 11 is a flowchart of Embodiment 3 of a method for competing a channel according to the present invention.
  • Embodiment 12 is a schematic structural diagram of Embodiment 1 of a device for competing channels;
  • 13 is a schematic structural diagram of Embodiment 2 of a device for competing channels;
  • Embodiment 3 is a schematic structural diagram of Embodiment 3 of a device for competing channels
  • FIG. 15 is a schematic structural diagram of Embodiment 4 of a device for competing channels. detailed description
  • Figure 1 is a schematic diagram of the collision avoidance mechanism of the CSMA/CA protocol.
  • the transmitting node first listens to the channel for a distributed coordination frame interval (Downing Coordination Function Interframe Space, Jane Woer DIFS). The duration, if the channel is detected to be idle, performs a backoff process.
  • a distributed coordination frame interval Downing Coordination Function Interframe Space, Jane Woer DIFS.
  • the node can send a Request to Send (RTS) frame; after receiving the RTS frame, the receiving node passes Short Interframe Space (SIFS) replies to a Clear to Send (CTS) frame; after receiving RTS or CTS frames, other nodes according to the transmission duration in the RTS frame or CTS frame (Duration)
  • RTS Request to Send
  • SIFS Short Interframe Space
  • CTS Clear to Send
  • DAS Clear to Send
  • AAV Network Allocation Vector
  • the transmitting node sends a data (DATA) frame after the SIFS duration.
  • DATA data
  • the receiving node receives the DATA frame.
  • the response is acknowledged by an Acknowledgement (ACK) frame.
  • the foregoing RTS/CTS mechanism is a protection mechanism introduced in the IEEE 802.11 standard. Only one network device is allowed to access and transmit data during the same period of time, effectively protecting the frame sequence from interference from neighboring devices at the originating end and the receiving end.
  • the IEEE 802.11 working group established the HEW Learning Group in 2013 to introduce technologies such as Orthogonal Frequency Division Multiple Access (OFDMA) and scheduling in the IEEE 802.11 standard.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the HEW system works in the unlicensed frequency band. In the case of sharing the channel with the IEEE 802.11 standard system, the mechanism of the competitive channel is particularly important.
  • the HEW system can be combined with IEEE 802.11a, IEEE 802.1 ln, IEEE 802.1 lac.
  • the length of the NAV is equal to the length of the HEW BSS subsequent scheduling window; on the other hand, due to the HEW system After competing to the channel, it will enter the scheduling mode.
  • the Access Point (AP) and the Station (Station for short) under the same BSS must use this channel according to the scheduling indication. Improve the success rate of the competition channel to meet the business needs of the entire BSS.
  • the introduction of the scheduling mode is not considered. Only the network device that needs to send data participates in channel competition by sending an RTS frame. That is, if the AP needs to send data, the AP contends for the channel, if some If a STA needs to send data, the STA contends for the channel. With this method, the probability of successful BSS channel competition is not high. Therefore, there is a need to design a new set of devices and methods for competing channels to meet the above requirements.
  • the device in this embodiment belongs to a BSS, and the BSS includes an access point AP and at least one first station STA, and the AP and the AP At least one of the first STAs is involved in a contention channel, and the device may be an AP or any one of the first STAs.
  • the device may include: a listening module 11 and a contention module 12, wherein the listening module 11 is configured to listen to a channel;
  • the competition module 12 is configured to compete for the channel, and perform centralized control scheduling by the AP to enable all network devices in the BSS to use the channel to transmit data.
  • the device that contends the channel belongs to the BSS
  • the BSS is a basic service set in the WLAN that is introduced into the scheduling mode, including the AP and the at least one first STA, and the AP and the at least one of the first STAs all participate in the contention channel.
  • the first STA is a site of the HEW standard, and can support technologies such as OFDMA and scheduling. Whether the AP or the first STA contends to the channel, the entire BSS can use the channel for data transmission.
  • the network device of the contention channel includes a second STA in addition to the entire BSS, and the second STA does not belong to the BSS, and may be any one of the IEEE 802.11 series standards, and the second STA may cause interference to the first STA, so when the BSS After the contention channel is successful, the second STA enters the standby mode until the scheduling mode of the BSS ends, and then the contention channel is started, thereby avoiding interference to the first STA.
  • the device of the contention channel in this embodiment may be an AP in the BSS, or may be any one of the BSSs.
  • the listening module 11 of the device competing for the channel needs to listen to the channel before the device contends to the channel to determine the channel.
  • the state when the contention module 12 contends to the channel, hands over the control of the channel to the AP in the BSS, and centrally controls the channel through the AP.
  • the scheduling is such that all network devices in the BSS can use the channel to transmit data under the scheduling of the AP.
  • the device in this embodiment acts as a network device in the BSS, and listens to the channel and contends to the channel, and then the AP performs centralized control scheduling on the network device in the BSS, so that all network devices in the BSS are in a subsequent period of time.
  • the channel can be used to transmit data without having to compete again, which improves the channel competition success rate and data transmission efficiency of the network device in the BSS.
  • the AP needs to compete for the channel to enter the scheduling mode.
  • the channel is competed, whether the AP competes successfully or any one.
  • the network device participating in the contention channel in this embodiment includes the network device in the entire BSS, and whether or not it needs to transmit data, the channel competition success rate of the BSS is greatly improved.
  • the contention module 12 is specifically configured to: when the listening module 11 detects that the channel is in an idle state, competes to the channel by successfully transmitting a channel contention frame, optionally, channel competition.
  • the frame may also be referred to as a channel reservation frame (CRF), which is not specifically limited in this embodiment.
  • the contention module 12 may contend to the channel by successfully transmitting the RTS frame, where the RTS frame includes a transmission duration, a Receiver Address (RA), and a Transmitter Address (TA), in order to
  • the RTS frame in the embodiment is consistent in format.
  • the RTS frame in this embodiment may further include frame control information and frame control sequence (FCS) information, where the transmission duration is the scheduling duration required by the BSS, and the RA is the AP and the At least one first STA pre-agreed identification information.
  • FCS frame control sequence
  • the RTS frame of this embodiment may be a frame dedicated to the HEW system, a total of 20 bytes, control information has 2 bytes, and the transmission duration has 2 bytes, RA. There are 6 bytes, the TA has 6 bytes, and the FCS information has 4 bytes.
  • the format of the HEW RTS frame is exactly the same as the RTS frame format in the IEEE 802.11 standard, so that all STAs, including the first STA and the second STA.
  • the RTS frame can be accepted and demodulated.
  • Each HEW RTS frame occupies a bandwidth of 20 MHz (MHz), which has 64 subcarriers on the 20 MHz bandwidth, and the number and location of pilot subcarriers are also the same as the RTS frames in the IEEE 802.11 standard.
  • the transmission duration is the scheduling duration required by the BSS, that is, the length of time required for the AP belonging to the BSS and the first STA to transmit data after the BSS contending channel succeeds, and the second STA sets the NAV according to the transmission duration.
  • the first STA determines the size of the scheduling window by using the length of the transmission; the RA is the identification information pre-agreed by the AP and the first STA, and all the first STAs in the BSS can obtain the identification information, After the first STA demodulates the identification information in the RTS frame, it is known that this is a HEW RTS frame, and it is known that the BSS has contend for the channel and is about to enter the scheduling window.
  • the RA may be set to any identification information other than the MAC address of the second STA, so as to prevent the second STA from erroneously thinking that it is an RTS frame sent to itself, for example, may be the MAC address of the AP, the identification information of the BSS, and the first STA. Group number, etc.
  • the contention module 12 may also compete for the channel by successfully sending the CTS frame,
  • the CTS frame includes a transmission duration and an RA.
  • the CTS frame in this embodiment may further include frame control information and FCS information, where the transmission duration is the scheduling duration required by the BSS, and the RA is The identification information pre-agreed by the AP and the at least one first STA.
  • 4 is a schematic diagram of a CTS frame format. As shown in FIG. 4, the CTS frame of this embodiment may be a frame dedicated to the HEW system, a total of 14 bytes, control information has 2 bytes, and the transmission duration has 2 bytes, RA.
  • the FCS information has 4 bytes
  • the format of the HEW CTS frame is exactly the same as the CTS frame format in the IEEE 802.11 standard, so that all STAs, including the first STA and the second STA, can accept the CTS frame and demodulation.
  • the difference from the CTS frame in the IEEE 802.11 standard is that, in the HEW CTS frame, the transmission duration is the scheduling duration required by the BSS, that is, the length of time required for the AP belonging to the BSS and the first STA to transmit data after the BSS contention channel is successful.
  • the second STA sets the NAV according to the transmission duration to determine the length of time to wait.
  • the first STA determines the size of the scheduling window by using the transmission duration.
  • the RA is the identification information pre-agreed by the AP and the first STA, and all the parameters in the BSS.
  • the STA can obtain the identification information, so that when the first STA demodulates the identification information in the CTS frame, it knows that this is a HEW CTS frame, and knows that the BSS has contend for the channel, and is about to enter the scheduling window.
  • the RA may not be set to the MAC address of the second STA, to prevent the second STA from mistakenly thinking that it is a CTS frame sent to itself, or may be set to the MAC address of the AP, so that the HEW CTS frame and the second STA are sent to the AP.
  • the CTS frames are distinguished.
  • the HEW system is compatible with other IEEE 802.11 standards, which is easy to implement, and the first site and the second site are set for different contents of the same field. Can clearly demodulate and know A glimpse of the behavior of the existing RTS/CTS mechanism is compatible with the HEW system.
  • the technical solutions of any of the device embodiments shown in FIG. 2 to FIG. 4 will be described in detail below by using several specific embodiments.
  • the application scenario includes a BSS 10 and a second STA 20 of a WLAN system that introduces a scheduling mode, where the BSS 10 includes an AP 11 and three first STAs 12, 13 and 14, the second STA 20 is a site conforming to the IEEE 802.11a, l lg, l ln or 1 lac standard.
  • the AP 11 and the first STAs 12, 13, and 14 both listen to the channel and participate in the contention channel.
  • FIG. 6 is a schematic structural diagram of Embodiment 2 of a device for competing channels according to the present invention.
  • the device for competing channels in this embodiment is AP11 in BSS10, and the AP11 includes: a listening module 21, a competition module.
  • the scheduling module 23 configured to send the control frame, so that the first S The data transmission is performed by the first STA 12, 13 or 14, and optionally, the data frame transmitted by the first STA 12, 13 or 14 is received.
  • the receiving module 24 is not required. This is because the process of the first STA replying to the CTS frame after the API 1 successfully transmits the RTS frame is not necessary, if the first STA sends the The CTS frame, after which the AP retransmits the control frame. If the first STA does not need to reply to the CTS frame, the AP may also send the control frame. This embodiment does not specifically limit this.
  • the AP 11 contends to the channel by successfully transmitting one HEW RTS frame, and the TA in the HEW RTS frame is the address of the AP11.
  • the AP 11 sends out the HEW RTS frame, and the first STAs 12, 13 and 14 receive the HEW RTS frame.
  • the BSS 10 has successfully contending to the channel, is about to enter the scheduling window, and continues. Listening to the channel, preparing to receive the control frame sent by AP11 for controlling data transmission.
  • the first STA 12, 13 or 14 may also reply the CTS frame to the AP 11 to avoid the hidden node problem, and the manner of replying to the CTS frame may be multiple first STAs.
  • the first STAs 12, 13, and 14 may also reply in sequence, and the specific limitation is not made herein;
  • the second STA 20 receives the HEW RTS frame and uses it as an RTS frame parsing of the IEEE 802.11 standard, and can know that it is not the target receiving end, and According to the transmission duration in the HEW RTS frame, the NAV of its own is set, and the waiting mode is entered, and the channel is again contending after the transmission duration of the BSS ends.
  • the device in this embodiment successfully sends an HEW RTS frame to the channel through the AP, so that the first STA in the BSS can enter the scheduling mode, and the data is transmitted through the contention channel, and the second STA sets its own NAV to enter the waiting.
  • the mode which is compatible with the system of the HEW system and the IEEE 802.11 standard, improves the channel competition success rate of the BSS.
  • the contention module 22 of the AP11 is further configured to: when the listening module 21 detects that the channel is in an idle state, by successfully transmitting one CTS frame to compete Passing, by the CTS frame, the at least one first STA 12, 13 and 14 to learn that the BSS contends for a channel according to the RA in the CTS frame, and continues to listen to the channel to receive the a control frame sent by the AP 11 for controlling data transmission; causing the second STA 20 to learn that the channel is occupied according to the CTS frame, and setting its own network allocation vector NAV according to the transmission duration in the CTS frame;
  • the module 23 is further configured to send the control frame, so that the first STA 12, 13, or 14 performs data transmission.
  • the AP11 contends to the channel by successfully transmitting one HEW CTS frame, and the AP11 sends out the HEW CTS frame, and the first STAs 12, 13 and 14 receive the HEW CTS frame.
  • the RA in the HEW CTS frame it can be known that the BSS10 has successfully competed.
  • the channel When the channel is reached, it will enter the scheduling window, and then continue to listen to the channel, ready to receive the control frame sent by AP11 for controlling data transmission.
  • the first STA 12, 13 or 14 may also reply the CTS frame to the AP 11 to avoid a hidden node problem, and the manner of replying to the CTS frame may be initiated by multiple first STAs.
  • the first STAs 12, 13, and 14 may be sequentially replied, and the present invention does not limit the present invention
  • the second STA 20 receives the HEW CTS frame and uses it as the CTS frame of the IEEE 802.11 standard to learn that it is not the target receiving end.
  • the NAV of its own is set, and the waiting mode is entered, and the channel is re-competed after the transmission duration of the BSS ends.
  • FIG. 7 is a schematic structural diagram of Embodiment 3 of a device for competing channels according to the present invention, and FIG. 5 and FIG.
  • the device of the contending channel of the present embodiment is any one of the first STAs in the BSS 10, for example, the first STA 12, the first STA 12 includes: a listening module 31 and a contention module 32, wherein the listening module 31, For the listening channel; the competing module 32, when the listening module 31 detects that the channel is in an idle state, contending to the channel by successfully sending one of the RTS frames, the TA in the RTS frame Addressing the address of the AP 11 or successfully transmitting the address of the first STA 12 of the RTS; by using the RTS frame, causing other first STAs 13 and 14 to learn from the RA and the TA in the RTS frame
  • the BSS10 is successfully channeled, and the first STAs 12, 13 and 14 continue to listen to the channel to receive a control frame sent by the API 1 for controlling data transmission; causing the second STA 20 to
  • the first STA 12 contends to the channel by successfully transmitting one HEW RTS frame, where the TA in the HEW RTS frame is the address of the API 1 or the address of the first STA 12 that successfully transmits the HEW RTS frame, where TA
  • the address set to AP11 is because all of the first STAs 12, 13, and 14 in the BSS 10 know the address of the AP 11, and regardless of which first STA contends to the channel, the AP 11 transmits a control frame for controlling data transmission.
  • the first STA 12 sends out the HEW RTS frame, and the first STAs 13 and 14 receive the HEW RTS frame.
  • the BSS 10 has successfully contending to the channel, and is about to enter the scheduling window, BSS10. All the first STAs 12, 13 and 14 continue to listen to the channel, ready to receive the control frame sent by the AP 11 for controlling data transmission; the second STA 20 receives the HEW RTS frame and treats it as an RTS frame of the IEEE 802.11 standard. It can be known that it is not the target receiving end, according to the transmission duration in the HEW RTS frame, set its own NAV, enter the waiting mode, and contend for the channel again after the transmission duration of the BSS ends; AP11 receives the HEW RTS frame, and can learn the BSS competition. When the channel is successful, a control frame for controlling data transmission of the first STA is transmitted.
  • the device in this embodiment successfully sends a HEW RTS frame to the channel through the first STA, so that the AP and the first STA in the BSS can enter the scheduling mode, and the data is transmitted through the contention channel, and the second STA sets itself.
  • the NAV enters the standby mode, and the compatibility between the HEW system and the IEEE 802.11 standard system is realized, and the channel competition success rate of the BSS is improved.
  • the API 1 may reply to a CTS after receiving the HEW RTS frame.
  • the reason is that there may be a first STA, such as the first STA 13, which fails to receive the HEW RTS frame sent by the first STA 12. Therefore, the API 1 sends a CTS frame, so that all the first STAs in the BSS know that the BSS has Successfully competed for the channel and is about to enter the scheduling window.
  • the other first STAs 13 and 14 may learn from the RAs in the HEW RTS frame that the BSS contends for the channel according to the RA in the CTS frame replied by the AP 11, and the first STAs 12, 13 and 14 continue to listen to the channel to receive the AP 11 transmission.
  • a control frame for controlling data transmission the second STA 20 learns that the channel is occupied according to the HETS RTS frame or the CTS frame replied by the AP 11, and sets its own network allocation vector NAV according to the transmission duration in the HEW RTS frame or the CTS frame; API 1 transmitting a control frame to cause the first STA 12, 13 or 14 to perform data transmission.
  • the interception module 31 is further configured to: when the channel is in the idle state, the one of the CTS frames is successfully contending to the channel; and the other first STAs 13 and 14 are configured according to the CTS frame.
  • the RA in the CTS frame learns that the BSS contention channel is successful, and the first STAs 12, 13 and 14 continue to listen to the channel to receive a control frame sent by the API 1 for controlling data transmission;
  • the STA 20 learns that the channel is occupied according to the CTS frame, and sets its own network allocation vector NAV according to the transmission duration in the CTS frame; and causes the AP11 to send the control frame, so that the first STA12, 13 or 14 performs data transmission.
  • the first STA 12 contends to the channel by successfully transmitting one HEW CTS frame, the first STA 12 sends out the HEW CTS frame, and the first STAs 13 and 14 receive the HEW CTS frame.
  • the RA in the HEW CTS frame it can be known that the BSS 10 has already Successfully competing for the channel, entering the scheduling window, all the first STAs 12, 13 and 14 in the BSS 10 continue to listen to the channel, ready to receive the control frame sent by the API 1 for controlling the data transmission; the second STA 20 receives the HEW CTS frame
  • the CTS frame analysis of the IEEE 802.11 standard it can be known that it is not the target receiving end.
  • the AP11 According to the transmission duration in the HEW CTS frame, set its own NAV, enter the waiting mode, and re-competition the channel after the transmission time of the BSS ends.
  • the AP11 receives the HEW CTS frame, and can learn that the BSS contention channel is successful, and then sends a control frame for controlling data transmission of the first STA.
  • the AP 11 may reply to a CTS frame for feedback after receiving the HEW CTS frame, because there may be a first STA, such as the first STA 13, which fails to receive The HEW CTS frame sent by the first STA 12, so the AP 11 sends a CTS frame, so that all the first STAs in the BSS know that the BSS has successfully competed for the message. Road, is about to enter the scheduling window.
  • a first STA such as the first STA 13 which fails to receive The HEW CTS frame sent by the first STA 12, so the AP 11 sends a CTS frame, so that all the first STAs in the BSS know that the BSS has successfully competed for the message. Road, is about to enter the scheduling window.
  • the other first STAs 13 and 14 may learn from the RA in the HEW CTS frame that the BSS contends for the channel success according to the RA in the CTS frame for feedback that the AP 11 replies, and the first STAs 12, 13 and 14 continue to listen to the channel for reception.
  • a control frame sent by the AP 11 for controlling data transmission the second STA 20 learns that the channel is occupied according to the CTS frame fed back by the HEW CTS frame or the AP11, and according to the HEW CTS frame or the transmission duration in the CTS frame for feedback
  • the own network allocation vector NAV is set; the API 1 transmits a control frame to cause the first STA 12, 13 or 14 to perform data transmission.
  • FIG. 8A is a first schematic diagram of a contention mechanism of a device for competing channels according to the present invention.
  • FIG. 8B is a second schematic diagram of a contention mechanism of a device for competing channels according to the present invention.
  • FIG. 8C is a third schematic diagram of a contention mechanism of a device for competing channels according to the present invention.
  • FIG. 8E is a schematic diagram of a competition mechanism of a device for competing channels according to the present invention.
  • FIG. 8F is a schematic diagram 6 of a contention mechanism of a device for competing channels according to the present invention.
  • the interframe spacing (DIFS and SIFS) in Figures 8A, 8B, 8C, 8D, 8E, and 8F and the interframe spacing used in all embodiments are the durations specified in the IEEE 802.11 standard, but The length or unit of other interframe spaces is also applicable, and is not specifically limited herein.
  • the AP listens to the channel, and if the channel is detected to be in the idle state within the duration of the DIFS, the backoff process is performed, and if the channel is still idle, the AP sends a HEW RTS frame after the end of the backoff; After receiving the HEW RTS frame, the STA replies with a HEW CTS frame after the SIFS duration; after receiving the HEW RTS frame, the second STA learns that the channel is occupied, and sets its own NAV according to the transmission duration in the HEW RTS frame.
  • the STA also sets or updates its own NAV according to the transmission duration in the HEW CTS frame sent by the first STA; after receiving the HEW CTS frame, the AP starts to send data (DATA) after the SIFS duration, where the data can represent the control information. , scheduling information, business data, and so on.
  • the AP in the BSS contends for the information by successfully transmitting the HEW RTS frame.
  • the device that needs to send data is an AP, so the AP participates in the contention channel, and the contention is successful, and the AP replies to the HEW CTS frame at the first STA. After that, the data starts to be sent in a short interval.
  • the first STA listens to the channel, and if the channel is detected to be in the idle state within the duration of the DIFS, the backoff process is performed, and if the channel is still idle after the end of the backoff, the first STA sends a HEW RTS.
  • the AP replies with a HEW CTS frame after the SIFS duration; after receiving the HEW RTS frame, the second STA knows that the channel is occupied.
  • the NAV is set according to the transmission duration in the HEW RTS frame
  • the second STA also sets or updates its own NAV according to the transmission duration in the HEW CTS frame sent by the AP; the AP transmits the HEW CTS frame and then passes the SIFS.
  • the duration starts to send data (DATA), where the data can represent control information, scheduling information, business data, and so on.
  • DATA data
  • the first STA in the BSS contends to the channel by successfully transmitting the HEW RTS frame.
  • the device that needs to send data is an AP, but here is a first STA competing to the channel, the first After the STA competes for the channel, the AP uses the channel, which can be considered as the first STA "helping" the AP to contend to the channel, which is different from the device in the prior art that needs to transmit data to compete for the channel.
  • the first STA first listens to the channel, and if the channel is detected to be in the idle state within the duration of the DIFS, the backoff process is performed. If the channel is still idle after the end of the backoff, the first STA sends a HEW. RTS frame; after receiving the HEW RTS frame, the AP starts to send data (DATA) after the SIFS duration, where the data can represent control information, scheduling information, service data, etc.; after receiving the HEW RTS frame, the second STA learns the channel. If it is occupied, its own NAV is set according to the transmission duration in the HEW RTS frame.
  • the difference between this embodiment and the embodiment shown in FIG. 8B is that the AP does not reply to the HEW CTS frame after receiving the HEW RTS frame, but waits for a SIFS duration to directly transmit data.
  • the first STA listens to the channel, and if the channel is detected to be in the idle state within the duration of the DIFS, the backoff process is performed. If the channel is still idle after the end of the backoff, the first STA sends a HEW RTS.
  • the AP After receiving the HEW RTS frame, the AP replies with a HEW CTS frame after the SIFS duration, where the RA in the HEW CTS frame is the identification information pre-agreed by the AP and the at least one first STA, and the identifier information is
  • the other first STAs reply to a HEW CTS frame after the SIFS duration, where the RA in the HEW CTS frame is the pre-agreed identification information of all devices (including the AP and the STA) in the BSS.
  • the identifier information is B.
  • the second STA After the second STA receives the HEW RTS frame and learns that the channel is occupied, the second STA sets its own NAV according to the transmission duration in the HEW RTS frame, and the second STA also uses the HEW in the HEW CTS frame sent by the AP.
  • the transmission duration sets or updates its own NAV; after transmitting the HEW CTS frame, the AP starts transmitting data (DATA) after the SIFS duration, where the data can represent control information, scheduling information, service data, and the like.
  • DATA data
  • FIG. 8B The difference between this embodiment and FIG. 8B is that other first STAs in the BSS also reply to a HEW CTS frame after receiving the HEW RTS frame, in order to avoid the hidden node problem.
  • the identification information A and the identification information B may be different to distinguish the Which device is sent by the HEW CTS frame.
  • the first STA1 listens to the channel, and if the channel is detected to be in the idle state within the duration of the DIFS, the backoff process is performed, and if the channel is still idle after the end of the backoff, the first STA sends a help AP.
  • a Help AP To Send (HTS) frame which is a channel contention frame newly proposed by the present invention, is sent by the first STA in the BSS, and is used to help the AP to preempt the channel, when the first STA successfully contends to the channel. After that, the control and usage rights of the channel are transferred to the AP.
  • HTS Help AP To Send
  • the HTS frame may also be referred to as another name.
  • the name of the frame is not specifically limited.
  • the structure of the HTS frame may adopt a frame structure as shown in FIG. 3 or FIG. 4. If the structure of the HTS frame is the same as that of the HEW RTS frame (as shown in FIG. 3), the RA in the HTS frame may be an AP and a A STA pre-agreed, preferably a MAC address of the AP.
  • the TA in the HTS frame may also be a value agreed by the AP and the first STA in advance, preferably a MAC address of the first STA1, a MAC address of the AP, or a basic If the structure of the HTS frame is the same as the structure of the HEW CTS frame (as shown in FIG. 4), the RA in the HTS frame may be an AP in advance agreement with the first STA.
  • a good value preferably the MAC address of the AP; after receiving the HTS frame, the AP replies with a HEW RTS frame after the SIFS duration, and the RA in the HEW RTS frame may be a value agreed by the AP and the first STA in advance, for example.
  • the RA may be set to the BSSID; if the AP wants to send information to a group of first STAs, the RA may be set to the group ID of the first STA of the group (group ID)
  • the TA in the HEW RTS frame may be a value agreed by the AP and the first STA in advance.
  • the channel is occupied, and its own NAV is set or updated according to the Duration value (ie, the transmission duration) in the HTS frame and/or the HEW RTS frame and/or the HEW CTS frame.
  • the AP After receiving the HEW CTS frame sent by the first STA1 and/or the first STA2, the AP starts to send data (DATA) after the SIFS duration, where the data may represent control information, scheduling information, service data, and the like.
  • DATA data after the SIFS duration, where the data may represent control information, scheduling information, service data, and the like.
  • a first STA1 in the BSS contends to the channel by successfully transmitting the HTS frame.
  • the device that needs to send data is an AP, but here a first STA1 competes for the channel, the first After STA1 contends to the channel, the channel is used by the AP, which can be considered as the first STA1 "helping" the AP to contend to the channel, which Different from the device in the prior art, the device needs to send data, and the device contends for the channel.
  • the AP notifies all the first STAs or part of the first STAs in the BSS by sending the HEW RTS frame, and has already robbed the channel; the first STA1 and the A STA2 can avoid the problem of hidden nodes by replying to the HEW CTS frame.
  • the AP listens to the channel, and if the channel is detected to be in the idle state within the duration of the DIFS, the backoff process is performed. If the channel is still idle after the end of the backoff, the AP sends a HEW RTS frame, the HEW.
  • the RA in the RTS frame may be a value agreed by the AP in advance with the first STA.
  • the RA may be set to the BSSID; if the AP wants to send to a group of first STAs For the information, the RA may be set to the group ID of the first STA of the group, and the TA in the HEW RTS frame may be a value agreed by the AP and the first STA in advance, preferably the MAC address of the AP;
  • the STA1 and the first STA2 simultaneously reply to the HEW CTS frame after the SIFS duration;
  • the second STA learns that the channel is occupied, according to the HEW RTS frame and / or the transmission duration in the HEW CTS frame sets or updates its own NAV.
  • the AP starts to send data (DATA) after the SIFS duration.
  • the data here can represent control information, scheduling information, service data, and
  • the AP needs to send data, and the AP or the first STA competes for the channel, so that the AP uses the channel to transmit data.
  • the first STA can still use the channel to transmit data, but the channel resource used by the first STA to transmit data is the AP allocation. That is, the AP concentrates on channel control scheduling, and the AP can allocate resources for the first STA that needs to send data by sending a control frame as long as it contends to the channel.
  • the AP or the first STA may also contend for the channel by sending the HEW CTS frame, which is not specifically limited herein.
  • FIG. 9 is a flowchart of Embodiment 1 of a method for competing a channel according to the present invention. As shown in FIG. 9, the method in this embodiment may include:
  • Step 101 The first device in the BSS listens to the channel, where the BSS includes an access point AP and at least one first station STA, where the first device is the AP or any one of the first STAs.
  • the BSS is a basic service set in the WLAN system in which the scheduling mode is introduced.
  • the first device in the BSS listens to the channel, and the first device can be any network device in the BSS, and can be learned in time through the listening channel. Channel usage.
  • Step 102 The first device contends for the channel, and performs centralized control scheduling by using the AP, so that at least one network device in the BSS can use the channel to transmit data, the AP and the at least one The first STAs all participate in the contention channel.
  • the first device in the BSS contends to the channel, and all network devices in the BSS can use the contention channel to transmit data.
  • the BSS is a basic service set of the HEW system, and may include an AP and one or more A STA, where the first STA is a site of the HEW standard, and can support technologies such as OFDM, scheduling, etc., where the first device may be an AP or a first STA, and all network devices in the BSS participate in a contention channel, that is, Both listen to the channel.
  • the network device of the contention channel includes a second STA in addition to the entire BSS, and the second STA does not belong to the BSS, and may be any one of the IEEE 802.
  • the second STA may cause interference to the first STA, so After the BSS contends for the channel, the second STA enters the standby mode until the scheduling mode of the BSS ends, and then the contention channel is started, thereby avoiding interference to the first STA. After the AP or the first STA in the BSS contends to the channel, the control of the channel is handed over to the AP, and the AP performs centralized control on the channel, and allocates the right to use the channel to the first STA. Therefore, any device in the BSS competes. After the channel, the channel competition is successful, and all network devices in the BSS can use the channel to transmit data.
  • all the network devices in the BSS participate in the contention channel.
  • the AP can perform centralized control scheduling on the network devices, so that the subsequent time period is performed.
  • All network devices in the inner BSS can use the contention channel to transmit data without having to compete again, which improves the network device channel competition success rate and data transmission efficiency in the BSS.
  • the first device contends for the channel and the specific implementation method may be: the first device detects that the channel is in an idle state, and successfully sends a channel.
  • the contention frame competes for the channel.
  • the network device contending channel in the BSS may be contending for the channel by successfully transmitting the channel contending frame.
  • the channel contending frame may be sent when the channel is idle.
  • a device that successfully advertises a channel contention frame is a device that successfully contends to the channel.
  • the channel contention frame may be an RTS frame, and the RTS frame includes a transmission duration, an RA, and a TA.
  • the RTS frame in this embodiment may further include frame control information, in order to maintain the format consistent with the existing RTS frame.
  • the FCS information where the transmission duration is a scheduling duration required by the network device in the BSS, and the RA is the AP and the at least one first STA Pre-agreed identification information.
  • the format of the RTS frame is as shown in FIG. 3.
  • the RTS frame of this embodiment may be a frame dedicated to the HEW system, a total of 20 bytes, control information has 2 bytes, the transmission duration has 2 bytes, and the RA has 6 bytes.
  • TA has 6 bytes and FCS information has 4 bytes.
  • the format of the HEW RTS frame is exactly the same as the RTS frame format in the IEEE 802.11 standard, so that all STAs, including the first STA and the second STA, can accept the RTS. Frame and demodulate.
  • Each HEW RTS frame occupies a bandwidth of 20 MHz, which has 64 subcarriers on the 20 MHz bandwidth, and the number and location of pilot subcarriers are also the same as the RTS frames in the IEEE 802.11 standard. If there is a bandwidth of 80 MHz, HEW RTS frames are transmitted separately on each 20 MHz bandwidth.
  • the transmission duration is the scheduling duration required by the BSS, that is, the length of time required for the AP belonging to the BSS and the first STA to transmit data after the BSS contention channel is successful.
  • the second STA sets the NAV according to the transmission duration to determine the length of time to wait.
  • the first STA determines the size of the scheduling window by using the transmission duration.
  • the RA is the identification information pre-agreed by the AP and the first STA, and all the parameters in the BSS.
  • the STA can obtain the identification information, so that when the first STA demodulates the identification information in the RTS frame, it knows that this is a HEW RTS frame, and knows that the BSS has contend for the channel, and is about to enter the scheduling window.
  • the RA may be set to any identification information other than the MAC address of the second STA, so as to prevent the second STA from erroneously thinking that it is an RTS frame sent to itself, for example, may be the MAC address of the AP, the identification information of the BSS, and the first STA. Group number, etc.
  • the foregoing channel contention frame may be a CTS frame, where the CTS frame includes a transmission duration and an RA, and the CTS frame in this embodiment may further include frame control information and in order to maintain the format consistent with the existing CTS frame.
  • the FCS information where the transmission duration is a scheduling duration required by the network device in the BSS, and the RA is identifier information pre-agreed by the AP and the at least one first STA.
  • the format of the CTS frame is as shown in FIG. 4.
  • the CTS frame of this embodiment may be a frame dedicated to the HEW system, a total of 14 bytes, control information has 2 bytes, the transmission duration has 2 bytes, and the RA has 6 bytes.
  • the FCS information has 4 bytes, and the format of the HEW CTS frame is exactly the same as the CTS frame format in the IEEE 802.11 standard, so that all STAs, including the first STA and the second STA, can accept the CTS frame and demodulate.
  • the difference from the CTS frame in the IEEE 802.11 standard is that, in the HEW CTS frame, the transmission duration is the scheduling duration required by the BSS, that is, the length of time required for the AP belonging to the BSS and the first STA to transmit data after the BSS contention channel is successful.
  • the second STA sets the NAV according to the transmission duration to determine the length of time to wait.
  • the first STA determines the size of the scheduling window by using the transmission duration.
  • the RA is the identification information pre-agreed by the AP and the first STA, BSS. All the first STAs can obtain the identification information, so that after the first STA demodulates the identification information in the CTS frame, it is known that this is a HEW CTS frame, and it is known that the BSS has contend for the channel, that is, Enter the scheduling window.
  • the RA may not be set to the MAC address of the second STA, to prevent the second STA from mistakenly thinking that it is a CTS frame sent to itself, or may be set to the MAC address of the AP, so that the HEW CTS frame and the second STA are sent to the AP.
  • the CTS frames are distinguished.
  • the HEW system is compatible with other IEEE 802.11 standards, which is easy to implement, and the first site and the second site are set for different contents of the same field. It can clearly demodulate and know the behavior of the next one, and solves the compatibility problem between the existing RTS/CTS mechanism and the WLAN system that introduces the scheduling mode.
  • FIG. 5 The application scenario of the following embodiment is shown in FIG. 5.
  • FIG. 10 is a flowchart of Embodiment 2 of a method for competing a channel according to the present invention.
  • an AP in a BSS contends to a channel.
  • the method in this embodiment may include:
  • all the network devices are listening to the channel, and all the network devices include the AP and the first STA that belong to the same BSS, and the second STA.
  • S202 The AP detects that the channel is in an idle state, and contends to the channel by successfully sending an RTS frame.
  • the AP in the BSS detects that the channel is in an idle state, and successfully contends to the channel by sending an RTS frame.
  • the TA in the RTS frame is the address of the AP, and the RTS frame may be a frame dedicated to the HEW system, and the AP After successfully transmitting the RTS frame, the BSS to which it belongs can transmit data through the contention channel.
  • the first STA learns that the BSS contending channel succeeds according to RA and TA in the RTS frame, and continues to listen to the channel to receive a control frame sent by the AP for controlling data transmission.
  • the HEW RTS frames received by the three first STAs of the BSS, through the RA and the TA in the HEW RTS frame can thereby know that the BSS has successfully contend to the channel, and is about to enter.
  • the scheduling window continues to listen to the channel, ready to receive control frames sent by the AP for controlling data transmission.
  • the first STA may also reply the CTS frame to the AP to avoid the hidden node problem, and the manner of replying to the CTS frame may be three first STAs - starting or three. The first STAs reply in turn, and no specific restrictions are made here.
  • the second STA learns that the channel is occupied according to the RTS frame, and sets its own NAV according to the transmission duration in the RTS frame.
  • the second STA receives the HEW RTS frame and uses it as the RTS frame of the IEEE 802.11 standard, and can learn that the channel is occupied, and is not the target receiving end itself, according to the transmission duration in the HEW RTS frame.
  • the NAV of its own enters the standby mode, and the channel is re-competed after the end of the transmission time of the BSS.
  • the AP sends a control frame, so that at least one first STA performs data transmission.
  • the AP sends a control frame to the first STA, so that the at least one first STA performs data transmission, and the control frame may be sent only to the first STA that needs to be scheduled, or may be sent to all the first STAs. , there is no specific limit here.
  • the AP successfully transmits one HEW RTS frame to the channel, so that the first STA in the BSS can enter the scheduling mode, and the data is transmitted through the contention channel, and the second STA sets its own NAV into the standby mode.
  • the compatibility of the HEW system with the IEEE 802.11 standard system is improved, and the channel competition success rate of the BSS is improved.
  • the AP contends to the channel by successfully transmitting the HEW RTS frame.
  • the AP may also contend to the channel by successfully transmitting the HEW CTS frame; the first STA according to the RA in the HEW CTS frame Knowing that the BSS contention channel is successful, continuing to listen to the channel to receive the control frame sent by the AP for controlling data transmission; the second STA knows that the channel is occupied according to the HEW CTS frame, and sets its own NAV according to the transmission duration in the HEW CTS frame.
  • the AP sends a control frame to enable at least one first STA to perform data transmission.
  • FIG. 11 is a flowchart of Embodiment 3 of a method for competing a channel according to the present invention.
  • any one of the first STAs in the BSS may be the first STA 12.
  • the method in this embodiment may include :
  • the process of listening to the channel by all the network devices is similar to the step s201 of the foregoing method embodiment, and details are not described herein.
  • the first STA detects that the channel is in an idle state, and successfully sends an RTS frame. Struggle to the channel;
  • any one of the first STAs in the BSS hears that the channel is in an idle state, and successfully advertises an RTS frame to the channel, and the TA in the RTS frame is the address of the AP or successfully sends the RTS.
  • the address of the first STA 12, the RTS frame may be a frame dedicated to the HEW system. After the first STA 12 successfully transmits the RTS frame, the BSS to which it belongs may transmit data through the contending channel.
  • the other first STA learns that the BSS contending channel succeeds according to the RA and the TA in the RTS frame, and the first STA continues to listen to the channel to receive the control frame sent by the AP for controlling data transmission.
  • the other part in the BSS A STA that is, the first STAs 13 and 14 receive the HEW RTS frame.
  • the control frame sent to control the data transmission.
  • the second STA learns that the channel is occupied according to the RTS frame, and sets its own NAV according to the transmission duration in the RTS frame.
  • the process in which the second STA learns that the channel is occupied according to the RTS frame and sets the NAV according to the transmission duration in the RTS frame is similar to the step S204 in the foregoing method embodiment, and details are not described herein again.
  • the AP sends a control frame, so that at least one first STA performs data transmission.
  • the process of the AP transmitting the control frame to enable the data transmission by the at least one first STA is similar to the step s205 of the foregoing method embodiment, and details are not described herein again.
  • the first STA successfully sends one HEW RTS frame to contend to the channel, so that the AP and the first STA in the BSS can enter the scheduling mode, and the data is transmitted through the contention channel, and the second STA sets its own NAV. Entering the standby mode, the compatibility between the HEW system and the IEEE 802.11 standard system is realized, and the channel competition success rate of the BSS is improved.
  • the AP may further include that the AP replies with one CTS frame according to the HEW RTS frame sent by the first STA, because there may be a first STA, for example, the first STA13, failing to The HEW RTS frame sent by the first STA 12 is received, so the AP sends a CTS frame, so that all the first STAs in the BSS know that the BSS has successfully contend for the channel, and will enter the scheduling window.
  • the first STA successfully transmits the HEW RTS frame Competing to the channel
  • the first STA may also contend for the channel by successfully transmitting the HEW CTS frame
  • the other first STA learns that the BSS contends the channel according to the RA in the HEW CTS frame, and the first STA in the BSS continues to listen.
  • the channel receives the control frame sent by the AP for controlling data transmission;
  • the second STA learns that the channel is occupied according to the HEW CTS frame, and sets its own NAV according to the transmission duration in the HEW CTS frame;
  • the AP sends the control frame to enable at least A first STA performs data transmission.
  • the structure of the device for competing channels shown in FIG. 2, FIG. 6, and FIG. 7 includes a plurality of modules.
  • the functions of the modules may be implemented by a transmitter, a processor, and a receiver, respectively.
  • the structure of the device competing for the channel will be described below using several embodiments.
  • the first STA detects that the channel is in an idle state, and may also contend to the channel by successfully transmitting an HTS frame, and the structure of the HTS frame may adopt a frame as shown in FIG. 3 or FIG.
  • the structure if the structure of the HTS frame is the same as that of the HEW RTS frame (as shown in FIG. 3), the RA in the HTS frame may be a value agreed by the AP and the first STA in advance, preferably the MAC address of the AP, HTS.
  • the TA in the frame may also be a value agreed by the AP in advance with the first STA, and is preferably a MAC address of the first STA1, a MAC address of the AP, or a Basic Service Set Identifier (BSSID).
  • BSSID Basic Service Set Identifier
  • the structure of the HTS frame is the same as that of the HEW CTS frame (as shown in FIG. 4), and the RA in the HTS frame may be a value agreed by the AP and the first STA in advance, preferably the MAC address of the AP.
  • the AP may send an HEW RTS frame, where the RA in the HEW RTS frame may be a value agreed by the AP and the first STA in advance, for example, if the AP wants to send information to all the first STAs.
  • the RA can be set to the BSSID. If the AP wants to send information to a group of first STAs, the RA can be set to the group ID of the first STA of the group.
  • the TA in the HEW RTS frame can be the AP and the AP.
  • the value negotiated by the first STA in advance is preferably the MAC address of the AP.
  • the RA in the HEW CTS frame is a value agreed by the AP and the first STA in advance, preferably the MAC address of the AP, to avoid hiding. Node problem.
  • the device in this embodiment belongs to a BSS, and the BSS includes an access point AP and at least one first station STA, and the AP and the At least one first STA participates in a contention channel, and the device is the AP or any
  • the device includes: a processor 11 for listening to a channel; competing for the channel, performing centralized control scheduling by the AP to enable at least one network device in the BSS The channel can be used to transmit data.
  • the device of the contention channel belongs to the basic service set BSS
  • the BSS is a basic service set in the WLAN system that introduces the scheduling mode, including the access point AP and the at least one first station STA, the AP and the At least one first STA participates in the contention channel, where the first STA is a site of the HEW standard, and can support technologies such as OFDMA and scheduling.
  • the APs can use the channel for data transmission whether the AP or the first STA contends to the channel.
  • the network device of the contention channel includes a second STA in addition to the entire BSS, and the second STA does not belong to the BSS, and may be any one of the IEEE 802.il series standards, and the second STA may cause interference to the first STA, so After the BSS contends for the channel, the second STA enters the standby mode until the scheduling mode of the BSS ends, and then the contention channel is started, thereby avoiding interference to the first STA.
  • the device in this embodiment may be an AP in the BSS, or may be any one of the first STAs in the BSS, and the processor 11 of the device competing for the channel needs to listen to the channel before the device contends to the channel to determine the state of the channel. After the processor 11 contends to the channel, all network devices in the BSS can use the channel to transmit data.
  • the device in this embodiment acts as a network device in the BSS, and listens to the channel and contends to the channel, and then the AP performs centralized control scheduling on the network device in the BSS, so that all network devices in the BSS are in a subsequent period of time.
  • the channel can be used to transmit data without having to compete again, which improves the channel competition success rate and data transmission efficiency of the network device in the BSS.
  • the device of this embodiment further includes: a transmitter 12, configured to After the processor detects that the channel is in an idle state, it successfully transmits a channel contention frame to cause the device to contend to the channel.
  • the transmitter 12 may contend to the channel by successfully transmitting the RTS frame, where the RTS frame includes the transmission duration, the RA, and the TA.
  • the RTS frame of this embodiment may further include The frame control information and the FCS information, where the transmission duration is the scheduling duration required by the BSS, and the RA is the identification information pre-agreed by the AP and the at least one first STA.
  • 3 is a schematic diagram of an RTS frame format. As shown in FIG. 3, the RTS frame of this embodiment may be a frame dedicated to the HEW system, a total of 20 bytes, control information has 2 bytes, and the transmission duration has 2 bytes, RA.
  • HEW RTS frame format There are 6 bytes, TA has 6 bytes, FCS information has 4 bytes, HEW RTS frame format and IEEE 802.11
  • the RTS frame format in the standard is identical, so that all STAs, including the first STA and the second STA, can accept the RTS frame and demodulate it.
  • Each HEW RTS frame occupies a bandwidth of 20 MHz, which has 64 subcarriers on the bandwidth of 20 MHz, and the number and location of pilot subcarriers are also the same as the RTS frames in the IEEE 802.11 standard. If there is a bandwidth of 80 MHz, HEW RTS frames are transmitted separately on each 20 MHz bandwidth.
  • the transmission duration is the scheduling duration required by the BSS, that is, the length of time required for the AP belonging to the BSS and the first STA to transmit data after the BSS contention channel is successful.
  • the second STA sets the NAV according to the transmission duration to determine the length of time to wait.
  • the first STA determines the size of the scheduling window by using the transmission duration.
  • the RA is the identification information pre-agreed by the AP and the first STA, and all the parameters in the BSS.
  • a STA knows the identification information in advance, so that when the first STA demodulates the identification information in the RTS frame, it knows that this is a HEW RTS frame, and knows that the BSS has contend for the channel, and is about to enter the scheduling window.
  • the RA may be set to any identification information other than the MAC address of the second STA, so as to prevent the second STA from erroneously thinking that it is an RTS frame sent to itself, for example, may be the MAC address of the AP, the identification information of the BSS, and the first STA. Group number, etc.
  • the transmitter 12 may also contend to the channel by successfully sending the CTS frame, where the CTS frame includes the transmission duration and the RA.
  • the CTS frame of this embodiment may further include The frame control information and the FCS information, where the transmission duration is the scheduling duration required by the BSS, and the RA is the identification information pre-agreed by the AP and the at least one first STA.
  • 4 is a schematic diagram of a CTS frame format. As shown in FIG. 4, the CTS frame of this embodiment may be a frame dedicated to the HEW system, a total of 14 bytes, control information has 2 bytes, and the transmission duration has 2 bytes, RA.
  • the FCS information has 4 bytes
  • the format of the HEW CTS frame is exactly the same as the CTS frame format in the IEEE 802.11 standard, so that all STAs, including the first STA and the second STA, can accept the CTS frame and demodulation.
  • the difference from the CTS frame in the IEEE 802.11 standard is that, in the HEW CTS frame, the transmission duration is the scheduling duration required by the BSS, that is, the length of time required for the AP belonging to the BSS and the first STA to transmit data after the BSS contention channel is successful.
  • the second STA sets the NAV according to the transmission duration to determine the length of time to wait.
  • the first STA determines the size of the scheduling window by using the transmission duration.
  • the RA is the identification information pre-agreed by the AP and the first STA, and all the parameters in the BSS.
  • the STA can obtain the identification information, so that when the first STA demodulates the identification information in the CTS frame, it knows that this is a HEW CTS frame, and knows that the BSS has contend for the channel, and is about to enter the scheduling window.
  • RA cannot be set to the MAC address of the second STA to avoid the second
  • the STA mistakenly believes that it is a CTS frame sent to itself, nor can it be set to the MAC address of the AP, so that the HEW CTS frame is distinguished from the CTS frame sent by the second STA to the AP.
  • the HEW system is compatible with other IEEE 802.11 standards, which is easy to implement, and the first site and the second site are set for different contents of the same field. It can clearly demodulate and know the behavior of the next ,, and solves the compatibility problem between the existing RTS/CTS mechanism and the WLAN introducing the scheduling mode.
  • the device of the contention channel is an AP
  • the AP includes: a processor 21, a transmitter 22, and a receiver 23, wherein the processor 21,
  • the transmitter 22 is configured to successfully send one of the RTS frames after the processor 21 of the AP detects that the channel is in an idle state, so that the AP competes to the Channel, the TA in the RTS frame is an address of the AP; by the RTS frame, causing the at least one first STA to learn the BSS according to the RA and the TA in the RTS frame Successfully listening to the channel, and continuing to listen to the channel to receive a control frame sent by the AP for controlling data transmission; causing the second STA to learn, according to the RTS frame, that the channel is occupied, and according to the RTS frame
  • the transmission time length is set to its own network allocation vector NAV; the control frame is sent to enable the at least one first STA to perform data transmission; and
  • the device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 9 to FIG. 11 , and details are not described herein again.
  • the transmitter 22 can also be used to contend to the channel by successfully transmitting a CTS frame, by which the at least one first STA learns the BSS according to the RA in the CTS frame. Successfully listening to the channel, and continuing to listen to the channel to receive a control frame sent by the AP for controlling data transmission; causing the second STA to learn, according to the CTS frame, that the channel is occupied, and according to the CTS frame
  • the transmission duration is set by its own network allocation vector NAV; the control frame is sent to enable the at least one first STA to perform data transmission.
  • the device of the contention channel is any one of the first STAs in the BSS, and the first STA includes: a processor 31 and a transmitter 32, where The processor 31 is configured to listen to a channel, and the transmitter 32 is configured to successfully send the RTS after the processor of the first STA detects that the channel is in an idle state.
  • the frame causes the first STA to contend to the channel, the TA in the RTS frame is an address of the AP or an address of the first STA that successfully sends the RTS;
  • the other first STA learns that the BSS contending channel is successful according to the RA and the TA in the RTS frame, and the at least one first STA in the BSS continues to listen to the channel to receive the AP sending.
  • a control frame for controlling data transmission where the other first STA is a first STA of the BSS except for the first STA that successfully sends one of the RTS frames;
  • the RTS frame learns that the channel is occupied, and sets its own network allocation vector NAV according to the transmission duration in the RTS frame; and causes the AP to send the control frame, so that the at least one first STA performs data transmission.
  • the device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 9 to FIG. 11 , and details are not described herein again.
  • the transmitter 32 can also be used to contend for the channel by successfully transmitting a CTS frame, and the other first STAs can learn that the BSS contends for the channel according to the RA in the CTS frame by using the CTS frame.
  • the at least one first STA continues to listen to the channel to receive a control frame sent by the AP for controlling data transmission, where the other first STA is the CTS except for successfully transmitting the CTS.
  • a first STA outside the first STA of the frame causing the second STA to learn that the channel is occupied according to the CTS frame, and setting its own network allocation vector NAV according to the transmission duration in the CTS frame; And causing the AP to send the control frame, so that the at least one first STA performs data transmission.
  • the AP of the BSS can ensure that all the first STAs in the BSS have successfully competed for the channel by replying to a CTS frame.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separated.
  • the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention.
  • a computer device which may be a personal computer, a server, or a network device, etc.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

Des modes de réalisation de la présente invention concernent un procédé et un dispositif pour concurrence d'accès au canal. Le dispositif pour concurrence d'accès au canal de la présente invention appartient à un ensemble de services de base (BSS), et le BSS comprend un point d'accès (AP) et au moins une première station (STA). L'AP et la ou les premières STA participent à une concurrence d'accès au canal. Le dispositif est l'AP ou l'une quelconque des premières STA, et le dispositif comprend : un module d'interception pour intercepter le canal; et un module de concurrence pour concurrence d'accès au canal. Le ou les dispositifs de réseau dans le BSS peuvent tous utiliser le canal pour transmettre des données par planification de commande concentrée effectuée par l'AP. L'invention résout le problème de faible taux de succès de concurrence d'accès au canal BSS dans un système de réseau local sans fil (WLAN).
PCT/CN2014/071585 2014-01-27 2014-01-27 Procédé et dispositif pour concurrence d'accès au canal Ceased WO2015109603A1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
PCT/CN2014/071585 WO2015109603A1 (fr) 2014-01-27 2014-01-27 Procédé et dispositif pour concurrence d'accès au canal
EP14879647.7A EP3094150B1 (fr) 2014-01-27 2014-11-25 Procédé et appareil de concurrence pour un canal
PCT/CN2014/092132 WO2015109890A1 (fr) 2014-01-27 2014-11-25 Procédé et appareil de concurrence pour un canal
CN202110687347.8A CN113473621B (zh) 2014-01-27 2014-11-25 竞争信道的方法和装置
EP20199227.8A EP3826420B1 (fr) 2014-01-27 2014-11-25 Procédé de contention de canaux et appareil correspondant
CN201480072339.0A CN105900513B (zh) 2014-01-27 2014-11-25 竞争信道的方法和装置
EP23189115.1A EP4290976A3 (fr) 2014-01-27 2014-11-25 Procédé de contention de canaux et appareil correspondant
ES14879647T ES2855125T3 (es) 2014-01-27 2014-11-25 Método y aparato de contienda de canales
US15/220,258 US10149322B2 (en) 2014-01-27 2016-07-26 Channel contention method and apparatus
US16/124,876 US10827527B2 (en) 2014-01-27 2018-09-07 Channel contention method and apparatus

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CN111787626A (zh) * 2015-12-08 2020-10-16 华为技术有限公司 一种数据传输保护方法及其装置
CN116471703A (zh) * 2022-01-12 2023-07-21 华为技术有限公司 信道竞争方法及装置

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