WO2018036335A1 - 一种数据通信方法及装置 - Google Patents

一种数据通信方法及装置 Download PDF

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Publication number
WO2018036335A1
WO2018036335A1 PCT/CN2017/094465 CN2017094465W WO2018036335A1 WO 2018036335 A1 WO2018036335 A1 WO 2018036335A1 CN 2017094465 W CN2017094465 W CN 2017094465W WO 2018036335 A1 WO2018036335 A1 WO 2018036335A1
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Prior art keywords
bss
relay
identifier
ppdu
network node
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PCT/CN2017/094465
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English (en)
French (fr)
Inventor
淦明
于健
杨讯
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华为技术有限公司
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Publication date
Priority to KR1020187036014A priority Critical patent/KR102225300B1/ko
Priority to EP23157542.4A priority patent/EP4221428A3/en
Priority to ES17842758T priority patent/ES2942853T3/es
Priority to MYPI2018002166A priority patent/MY198143A/en
Priority to EP17842758.9A priority patent/EP3451782B1/en
Priority to JP2018560180A priority patent/JP6680906B2/ja
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to RU2019100479A priority patent/RU2712430C1/ru
Publication of WO2018036335A1 publication Critical patent/WO2018036335A1/zh
Priority to ZA2018/08125A priority patent/ZA201808125B/en
Priority to US16/220,635 priority patent/US11026259B2/en
Priority to US17/331,108 priority patent/US11716756B2/en
Priority to US18/332,269 priority patent/US12035366B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • 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]

Definitions

  • the present invention relates to the field of wireless network technologies, and in particular, to a data communication method and apparatus.
  • 802.11ah introduces multi-hop relay transmission for long-distance transmission, in which relay logic implements two functions. They are relay station (relay-STA) function and relay-access point (relay-AP) function.
  • relay-STA relay station
  • relay-AP relay-access point
  • the relay relay when the relay relay communicates with the associated upper-layer AP, it functions as a non-access type site, that is, acts as a relay-STA; when the relay-managed station communicates with the relay, the relay acts as an access type site at this time. That is, it acts as a relay-AP.
  • BSS Basic Service Set
  • BSS1 The upper-layer root AP associated with it belongs to BSS1 (the relay acts as the relay-STA function in BSS1), and the relay1 and its managed stations (including STA1 and STA3) are called BSS2 (the relay in BSS2 acts as relay- AP function).
  • SR spatial re-use
  • the relay1-AP module of the relay1 belongs to the BSS 2
  • the relay1-STA module belongs to the BSS 1
  • the traditional BSS-based identifier Multiple BSS concurrent transmissions can cause transmission collision problems.
  • the relay1-AP sends the PPDU1 to the STA1.
  • the root AP receives the PPDU1, but determines the PPDU of the OBSS based on the BSS identifier carried in the physical layer preamble of the PPDU1.
  • the root The AP can contend for the channel to send data to the site it manages, if the root AP sends data to relay1-STA. However, since the relay1 is transmitting data at this time, the data cannot be received at the same time, and the data sent by the root AP cannot be received, causing a collision problem of data transmission.
  • the embodiment of the invention provides a data communication method and device, which can solve the data transmission collision problem when spatial reuse is performed between different BSSs, and improve resource utilization.
  • an embodiment of the present invention provides a data communication method for a wireless local area network, where the wireless local area network includes a root access point, a root AP, a relay relay, and a station STA, where the root AP is associated with multiple relays.
  • Each of the plurality of relays is associated with one or more of the STAs, and the method is performed by a network node in a wireless local area network.
  • the network node may be a root access point, a root AP, or a site. STA, or it can be a relay relay.
  • the basic service set BSS identifier in the PPDU is obtained; if the BSS identifier in the PPDU is different from the first BSS identifier, and the PPDU is in the PPDU
  • the BSS identifier is the same as the second BSS identifier, and determines whether the PPDU meets a preset spatial multiplexing condition;
  • the BSS identifier is an identifier of the first BSS to which the network node belongs, the second BSS identifier is an identifier of the extended BSS to which the target relay belongs, and the target relay and the network node belong to the first BSS;
  • the PPDU satisfies the preset spatial multiplexing condition, and then the access access channel communicates with the station in the first BSS except the target relay.
  • the network node is an access type site in the first BSS, for example, the network node is a root access point root AP, or the network node is a relay relay, and the network node is a relay relay.
  • the relay relay is a relay-AP in the first BSS, and the network node receives a preset frame reported by the relay before acquiring the basic service set BSS identifier in the PPDU, where the preset frame includes The identifier of the extended BSS to which the relay belongs, the relay and the network node belong to the first BSS.
  • the preset frame may include any one of a data frame, a management frame, and a control frame.
  • the network node is a non-access type site in the first BSS, for example, the network node is a STA, or the network node is a relay relay, and the relay relay is in the If the first BSS is a relay-STA, the network node receives a management frame, and the management frame carries all the relays in the first BSS before acquiring the basic service set BSS identifier in the PPDU.
  • An extension of the BSS, the management frame being broadcast by an access type site within the first BSS to which the network node belongs.
  • the identifier of the extended BSS to which all the relays in the first BSS are carried in the foregoing management frame is the relay that the relay in the first BSS reports to the access type site in advance.
  • the extension of the BSS logo is the relay that the relay in the first BSS reports to the access type site in advance.
  • the PPDU includes a space-forbidden field, and before the network node competes for the access channel, the network node reads the value of the forbidden spatial multiplexing field; and determines the PPDU. Whether the value of the spatial multiplexing field is prohibited is an identifier for prohibiting spatial multiplexing, and if the value of the forbidden spatial multiplexing field is set to an identifier for prohibiting spatial multiplexing, competition for the channel is prohibited.
  • an embodiment of the present invention provides a relay network, where the relay network includes at least two basic service sets BSS, and the BSS identifiers of the at least two BSSs are the same, so that the BSSs of the relay network cannot Space reuse.
  • an embodiment of the present invention provides a data communication apparatus, which is applied to a network node in a wireless local area network, where the wireless local area network includes a root access point root AP, a relay relay, and a station STA, where the root AP and the root AP a plurality of relay associations, each of the plurality of relays being associated with one or more of the STAs, the data communication device comprising an acquisition unit, a determination unit, and a transceiver unit, wherein the acquisition unit is configured to receive the physical layer After the protocol data unit PPDU, the basic service set BSS identifier in the PPDU is obtained; the determining unit is configured to: if the BSS identifier in the PPDU is different from the first BSS identifier, and the BSS identifier and the second BSS in the PPDU If the identifier is the same, it is determined whether the PPDU meets the preset spatial multiplexing condition; the first BSS identifier is an identifier of the first BSS
  • an embodiment of the present invention provides a data communication apparatus, which is applied to any network node in a wireless local area network, where the wireless local area network includes a root access point root AP, a relay relay, and a station STA, where the root AP and the root AP a plurality of relay associations, each of the plurality of relays being associated with one or more of the STAs, the data communication device Included is a memory for storing computer executable program code; a transceiver, and a processor coupled to the memory and the transceiver;
  • the program code includes instructions, when the processor executes the instruction, the instruction causes the data communication device to perform an operation of: acquiring a basic service in the PPDU when receiving a physical layer protocol data unit PPDU a BSS identifier; if the BSS identifier in the PPDU is different from the first BSS identifier, and the BSS identifier in the PPDU is the same as the second BSS identifier, determining whether the PPDU meets a preset spatial multiplexing condition; a BSS identifier is an identifier of a first BSS to which the network node belongs, the second BSS identifier is an identifier of an extended BSS to which the target relay belongs, and the target relay and the network node belong to the first BSS; The PPDU satisfies the preset spatial multiplexing condition, and then the access access channel communicates with the station in the first BSS except the target relay.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for
  • the network node after receiving the physical layer protocol data unit PPDU, acquires the basic service set BSS identifier in the PPDU, if the BSS identifier in the PPDU is different from the first BSS identifier, and the PPDU is The BSS identifier is the same as the second BSS identifier, and determines whether the PPDU meets a preset spatial multiplexing condition; the first BSS identifier is an identifier of the first BSS to which the network node belongs, and the second BSS identifier is An identifier of the extended BSS to which the target relay belongs, the target relay and the network node belong to the first BSS; if the PPDU meets a preset spatial multiplexing condition, the access channel is contending with the first BSS The site other than the target relay communicates.
  • This method can solve the data transmission collision problem when spatial multiplexing is performed between different BSSs, realize spatial multiplexing in the relay network, and improve resource utilization.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a data communication method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a BSS color element according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a data communication apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another data communication apparatus according to an embodiment of the present invention.
  • the embodiment of the present invention can be applied to a Wireless Local Area Network (WLAN).
  • WLAN Wireless Local Area Network
  • the relay logically implements two functions, namely, a relay-STA function and a relay-access point (relay-AP) function.
  • relay-AP relay-access point
  • the relay relay when the relay relay communicates with the associated upper-layer AP, it functions as a site (that is, implements the relay-STA function); when the station managed by the relay relay communicates with it, it functions as an access point (that is, implements a relay) -AP function).
  • the WLAN may include multiple basic service sets BSS, and the network nodes in the basic service set are sites, and the sites include An Access Point (AP) and a Non-Access Type Site (Non-AP STA), each basic service set may include one AP and multiple associated with the AP.
  • Non-AP STA After the relay relay is introduced, since the relay relay includes two functions, the relay relay usually belongs to two different BSSs, and the relay-STA module of the relay relay belongs to one BSS, and the relay belongs to the non-bar in the BSS. The access type site, and the relay-AP module of the relay relay belongs to another BSS, and the relay belongs to the access type site in the other BSS.
  • Access type sites also known as wireless access points or hotspots.
  • the access type site is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors.
  • the access type site is equivalent to a bridge connecting the wired network and the wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the access type site may be a terminal device or a network device with a WiFi (English: Wireless Fidelity) chip.
  • the access type site may be a device supporting the 802.11ax standard, and optionally, the access type site may support 802.11ac, 802.11n, 802.11g, 802.11b, 802.11a, 802.11ah, and the like.
  • WLAN system equipment 802.11ac, 802.11n, 802.11g, 802.11b, 802.11a, 802.11ah, and the like.
  • Non-AP STA A non-access type site (English: None Access Point Station, referred to as Non-AP STA), which can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • Non-AP STA can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • mobile phone supporting WiFi communication function tablet computer supporting WiFi communication function, set-top box supporting WiFi communication function, smart TV supporting WiFi communication function, smart wearable device supporting WiFi communication function, and vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication.
  • the Non-AP STA can support the 802.11ax system.
  • the station supports multiple WLAN systems such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a, 802.11ah, and the like.
  • the relay relay is a site that can set the function of the access type site and the function of the non-access type site.
  • the relay relay acts as an access type site, and in another BSS, the relay relay acts as a relay relay.
  • Non-access type site In one BSS, the relay relay acts as an access type site, and in another BSS, the relay relay acts as a relay relay. Non-access type site.
  • the existing WiFi technology adopts the Carrier Sense Multiple Access/Collision Derect (CSMA/CA) protocol to implement interference avoidance, so that the communication pair first obtains the channel usage right through the competition to exclusive channel resources, and only the communication After the communication is completed, other communication pairs around can compete for the channel.
  • CSMA/CA Carrier Sense Multiple Access/Collision Derect
  • the spectrum efficiency is greatly limited. Since users at the edge of overlapping areas of multiple BSSs will be subject to interference from multiple surrounding BSSs, their communication opportunities and data throughput will be much smaller than the central users. Therefore, it is of great significance for edge users to spatially multiplex the transmission time of the OBSS communication pair to improve communication opportunities and spectrum efficiency in a high-density WIFI networking scenario.
  • the spatial multiplexing technique allows the user to perform concurrent transmission when receiving the on-going packet of the OBSS, but the spatial reuse (Spatial Reuse, SR) transmission cannot interfere with the on-going transmission pair of the OBSS.
  • SR nodes need to be spatially multiplexed only when certain conditions are met; in addition, existing standard Clear Channel Assessment (CCA) and Network Allocation Vector (NAV) rules Improvements are also needed to increase the chances of spatial reuse.
  • CCA Clear Channel Assessment
  • NAV Network Allocation Vector
  • 802.11ax introduces a basic service set (BSS) color field in the physical layer preamble efficient field, which is used to identify the BSS, and helps the receiving station to determine whether the received PPDU is from the BSS.
  • BSS basic service set
  • the PPDU is a data packet of the BSS, otherwise it is a data packet of the OBSS.
  • the receiving station can use the space reuse principle to access the channel, or prematurely read the received PPDU, thereby saving energy.
  • the principle of spatial multiplexing In the wireless communication system, when the device needs to transmit data on a certain channel, it first receives on this channel, and uses the Received Signal Strength Indication (RSSI) to determine whether the channel is used. Occupied, this RSSI is also known as CCA sensitivity.
  • RSSI Received Signal Strength Indication
  • CCA sensitivity According to the 802.11 standard, when a valid preamble is detected with an RSSI (-82 dBm (milliwatt decibel)) at or above the CCA threshold, the CCA indicates that the channel is busy.
  • the CCA threshold used to indicate channel busy is -62 dBm without detecting the preamble. If, after a given time, the device does not find that other devices send data on this channel through CCA, it starts to send; if it finds that other devices are sending data, it will refrain from retrying the process again after a period of random evasion.
  • the existing WIFI standard adopts a fixed threshold CCA.
  • the threshold setting is low, which can avoid interference to a certain extent, but also greatly reduces the concurrency probability in the case of dense networking. Therefore, in order to improve the chance of spatial multiplexing, an OBSS PD level (OPD) threshold is proposed to detect the signal strength of the OBSS data packet.
  • OPD OBSS PD level
  • Spatial multiplexing is a key technology to improve the total throughput and spectrum utilization of the system.
  • the STA receives the data packet from the OBSS and enables the SR to be performed under certain conditions, the STA starts the OPD threshold (OBSS PD level).
  • OPD threshold OPD level
  • the STA can contend for the channel for SR transmission.
  • the receiving station may terminate receiving the PPDU physical layer preamble BSS color field subsequent part (such as the media access control layer of the PPDU) Medium access control (MAC)) to achieve power savings.
  • the receiving station is a relay relay, when receiving the PPDU, it is determined that the BSS color carried by the PPDU physical layer preamble is inconsistent with the BSS color of the relay's relay-STA and the BSS of the relay-AP.
  • the power can be saved.
  • the BSS identifier is used to uniquely identify a BSS, such as a BSS color, a MAC address or a partial MAC address of the AP, and the BSS identifier is used as an example in FIG.
  • the network node in the embodiment of the present invention may be a site STA, or the network node may also be a root access point root AP, or the network node may also be a relay relay.
  • the relay relay of the embodiment of the present invention includes a relay-AP module and a relay-STA module, and the two modules respectively belong to different BSSs.
  • the same BSS to which the relay and the network node belong is referred to as a first BSS.
  • the other BSS to which the relay belongs is referred to as an extended BSS.
  • the relay 1-STA belongs to the BSS1
  • the relay 1-AP belongs to the BSS2.
  • the BSS to which the relay1-STA belongs to the network node root AP is referred to as the first BSS
  • the BSS2 to which the relay1-AP belongs is referred to as the extended BSS.
  • FIG. 1 is a schematic diagram of a typical WLAN deployment scenario.
  • the system includes three layers of network nodes.
  • the embodiment of the present invention is only a three-layer network node as an example, and the present invention is not limited.
  • the present invention may include a N (N is greater than or equal to 3) layer network node, such as the one in FIG. STA1 can be relayed relay3, and then the relay relay3 manages multiple STAs, thus forming a four-layer network architecture.
  • the network of FIG. 1 includes three BSSs (it is understood that three BSSs are only examples, and the present invention is not limited).
  • the relay relay logic in the figure implements two functions, namely, a relay-STA function and a relay-access point (access point) function.
  • a relay-STA function When the relay relay communicates with the associated upper AP (such as the root AP in the figure), it functions as a relay-STA; when the station managed by the relay relay communicates with it, such as STA 1 sends a packet to relay 1, this Relay 1 acts as a relay-AP function.
  • Each relay relay and its managed stations are referred to as a BSS, such as relay 1, STA 1, and STA3 is a BSS.
  • the network node in the embodiment of the present invention may be the root AP or the STA or the relay relay in FIG. 1. It should be noted that if the network node is the relay relay1, the first BSS may be the BSS1 in FIG. It is the BSS2 in FIG. 1. The method for determining the first BSS may be determined according to the BSS to which the station that the relay1 needs to communicate belongs to. For example, if the relay1 needs to communicate with the STA1, the first BSS is the BSS2.
  • each BSS has a BSS color that identifies the BSS.
  • the BSS color field is placed in the physical layer preamble signaling field of the PPDU or in the MAC header.
  • the network node can use the space reuse principle to improve the transmission efficiency of the concurrent data packet, thereby improving the network throughput rate.
  • the network node can adopt the power saving principle to terminate receiving the PPDU in advance to achieve power saving effect.
  • the relay relay can belong to two BSSs at the same time, for example, relay1-AP of relay1 belongs to BSS 2, and relay1-STA belongs to BSS 1, and multiple BSS concurrent transmissions based on BSS color cause collision problem of data transmission.
  • the relay1-AP sends the PPDU1 to the STA1.
  • the root AP receives the PPDU1, but the PSS of the received PPDU1 is determined to be the OBSS PPDU based on the BSS color of the PPDU1 physical layer preamble.
  • the root AP can contend for the channel to send data to the station it manages. If the root AP sends data to the relay1-STA. However, since relay1 is transmitting data at this time, data cannot be received at the same time, and the data sent by the root AP cannot be received. For example, STA1 sends PPDU2 to relay1-AP. At this time, the root AP receives the PPDU2, but the BSS color carried by the PPDU2 physical layer preamble is determined as the OBSS PPDU. The RSSI of the received PPDU2 meets the OPD threshold.
  • the root AP can contend for the channel to send data to its managed site if the RSSI of the PPDU2 meets the SR condition. If the root AP sends data to the relay1-STA. At this time, the packets received by relay1 from STA1 and the root AP will collide.
  • the traditional spatial reuse principle cannot be used for the judgment, but the identifier of the extended BSS to which all the relay relays in the BSS belong is further acquired. Therefore, when the network node receives the PPDU from the extended BSS to which the target relay belongs, it cannot communicate with the target relay because there may be a data collision problem.
  • the data communication method according to an embodiment of the present invention is used in a wireless local area network, where the wireless local area network includes a root access point, a root AP, a relay relay, and a site.
  • STA where the root AP is associated with multiple relays, each relay of the multiple relays and one or more of the STAs Association.
  • the network node in the embodiment of the present invention may be any station in the wireless local area network (including any one of a root access point, a root AP, a relay relay, and a station STA).
  • the data communication method according to the embodiment of the present invention Includes the following steps:
  • the network node After receiving the physical layer protocol data unit PPDU, the network node acquires a basic service set BSS identifier in the PPDU.
  • the network node may include an access type site (such as a root AP or a relay-AP in FIG. 1) or a non-access type site (such as STA or relay-STA in FIG. 1).
  • the relay may be an access-type site relay-AP or a non-access type site relay-STA.
  • the relay has different identities.
  • the BSS identifier in the PPDU is parsed from the physical layer preamble of the PPDU, and the BSS identifier in the PPDU is used to indicate the identifier of the BSS from the BPDU.
  • the station that sends the PPDU is a relay relay, and the BSS identifier in the PPDU is used to identify the BSS to which the module that sends the relay relay of the PPDU belongs. As shown in FIG. 1, if the relay1 is to send the PPDU to the AP in the BSS1, the BSS identifier included in the PPDU is the identifier of the BSS1 to which the relay-STA belongs.
  • the network node is an access type site in the first BSS
  • the method further includes:
  • the network node receives the preset frame reported by the relay, where the preset frame includes an identifier of the extended BSS to which the relay belongs, and the relay and the network node belong to the first BSS.
  • the preset frame includes any one of a data frame, a management frame, and a control frame.
  • the network node is an access type site in the first BSS, such as the root AP of BSS1 (the first BSS is BSS1) in FIG. 1, or the relay1-AP in BSS2 (the first BSS is BSS2) Then, all the relay relays in the first BSS report the identity of another BSS to which the associated access type site (ie, the network node) belongs, that is, the identifier of the extended BSS to which the relay belongs, as shown in FIG. All relay relays report to the network node the BSS identifier of the BSS where the relay-AP is located (for example, the BSS identifier may be a BSS color).
  • the relay1 reports the identity of the extended BSS to which the relay1-AP belongs (that is, the identifier of the BSS2) to the root AP, and the relay1-STA belongs to the BSS1.
  • the relay2 reports to the root AP the identity of the extended BSS to which the relay-AP belongs (that is, the identifier of the BSS3), and the relay2-STA belongs to the BSS1.
  • the network node is a relay relay
  • the relay is a relay-AP in the first BSS
  • all the relays in the first BSS report the identifier of another BSS in which the own relay-AP is located to the network node.
  • the method for reporting the BSS color to the network node by each relay may be: each relay sends a preset frame to the network node by using its own relay-STA module, where the MAC header of the preset frame carries the BSS color to notify The BSS color of the BSS where the network node has its relay-AP; the preset frame may be any one of a data frame, a management frame, or a control frame.
  • the network node is a non-access type site in the first BSS
  • the method further includes:
  • a management frame where the management frame carries an identifier of an extended BSS to which all relays in the first BSS belong, the management frame being broadcast by an access type site in a first BSS to which the network node belongs .
  • the network node is a non-access type site in the first BSS, such as BSS1 in FIG. 1 A BSS is STA0 of BSS1), or a relay1-STA in BSS1 (the first BSS is BSS1), or if the station managed by relay1-AP in BSS2 further includes a relay relay3, the relay3-STA of the relay3 belongs to the BSS2 Then, the network node may be a relay3-STA in BSS2 (the first BSS is BSS2).
  • Each relay in the first BSS in advance reports the BSS color of the BSS where its relay-AP is located to its associated access type site (which may be an AP or a relay-AP).
  • the method for reporting the BSS color by each relay may be: sending, by using the relay-STA module, a preset frame to the associated access type site, where the preset frame carries the BSS color in the MAC header to notify the The BSS color of the BSS where the associated access type site's own relay-AP is located.
  • the preset frame may be a control frame, a data frame, or a management frame.
  • the access type site (which may be a root AP or a relay-AP) collects the identifier of the extended BSS to which all the relays in the first BSS belong, and then the access type site broadcasts all the relay-STA communities managed by the same in the first BSS.
  • the broadcast mode may be to carry a BSS color element by using a beacon frame beacon or other management frame, as shown in FIG. 3, which is a schematic diagram of a BSS color element provided by an embodiment of the present invention, where the BSSID of each relay is It may not be included in the BSS color element.
  • the broadcast management frame may also include the relay of the relay itself. - The identity of the BSS to which the STA belongs.
  • the network node determines whether the PPDU meets a preset spatial multiplexing condition; a BSS identifier is an identifier of a first BSS to which the network node belongs, the second BSS identifier is an identifier of an extended BSS to which the target relay belongs, and the target relay and the network node belong to the first BSS;
  • the network node contends for an access channel, and communicates with a site other than the target relay in the first BSS.
  • the network node when the network node receives the PPDU, it is first determined whether the PPDU is a PPDU of the OBSS, that is, whether the BSS identifier carried in the PPDU and the first BSS identifier of the first BSS to which the network node belongs are determined.
  • the network node is a relay relay
  • the first BSS is the BSS to which the station that the relay relay pre-communicates
  • the PPDU is a PPDU of the OBSS
  • the BSS identifier in the PPDU is further matched with the identifier of the extended BSS to which all the relays in the first BSS are obtained by the network node, if the BSS identifier in the PPDU and the target relay in all the relays
  • the second BSS identifier of the associated extended BSS is the same, it is determined that the PPDU is the PPDU of the extended BSS to which the target relay belongs.
  • the target relay is one of all the relays in the first BSS
  • the extended BSS identifier to which the target relay belongs can match the BSS identifier in the PPDU.
  • the network node can contend for the access channel and communicate with the station other than the target relay in the first BSS, because the PPDU is from the extended BSS to which the target relay belongs, and the target relay may be receiving data or sending data. If the target relay is communicated, it may cause a data transmission conflict.
  • the network node when the network node receives the PPDU of the OBSS, and the BSS color carried by the PPDU physical layer preamble is inconsistent with the identifier of the extended BSS to which all the relays in the first BSS collected by the network node belong, if The RSSI of the received PPDU satisfies the condition that is less than the OPD threshold, and the RSSI of the PPDU satisfies the SR condition. At this time, the network node can contend for the channel to transmit data to any station within the first BSS.
  • the PPDU may be terminated, thereby saving power.
  • the network node is a relay relay, when the PPDU is received, it is determined that the BSS color carried by the PPDU physical layer preamble is inconsistent with the BSS color of the relay's relay-STA and the BSS of the relay-AP. The reception of the PPDU is terminated, thereby saving power.
  • the PPDU includes a prohibited spatial multiplexing field
  • the network node before the network node competes for the access channel, the network node also determines whether the value of the forbidden spatial multiplexing field in the PPDU is an identifier for prohibiting spatial multiplexing, and if so, prohibits the contention of the channel. Otherwise, the access channel can be contending.
  • each BSS has a different BSS color, and the BSS color is used only for power saving.
  • the specific operation step is a physical layer preamble of a PPDU sent by a site in each BSS.
  • the code contains a field that prohibits spatial multiplexing, and this field can be set to an identifier that prohibits spatial multiplexing.
  • the other BSS sites receive the PPDU, they will not be spatially multiplexed to avoid collisions.
  • the relay network includes at least two basic service sets BSS, and the BSS identifiers of the at least two BSSs are the same; thus, each site resolves to the BSS color carried in the PPDU. If the BSS color of the BSS to which it belongs is the same, spatial multiplexing will not be performed. It should be noted that the BSS colors may be different between different relay networks, that is, spatial multiplexing between different relay networks is allowed.
  • the network node after receiving the physical layer protocol data unit PPDU, acquires the basic service set BSS identifier in the PPDU, if the BSS identifier in the PPDU is different from the first BSS identifier, and the PPDU is The BSS identifier is the same as the second BSS identifier, and determines whether the PPDU meets a preset spatial multiplexing condition; the first BSS identifier is an identifier of the first BSS to which the network node belongs, and the second BSS identifier is An identifier of the extended BSS to which the target relay belongs, the target relay and the network node belong to the first BSS; if the PPDU meets a preset spatial multiplexing condition, the access channel is contending with the first BSS The site other than the target relay communicates.
  • This method can solve the data transmission collision problem when spatial multiplexing is performed between different BSSs, realize spatial multiplexing in the relay network, and improve resource utilization.
  • a data communication apparatus can be applied to any network node in a wireless local area network, where the wireless local area network includes a root access point, a root AP, and a relay. a relay and a site STA, wherein the root AP is associated with multiple relays, and each of the multiple relays is associated with one or more of the STAs, and the network node may include a site STA or a root
  • the access point root AP, or a relay relay can be any network node in Figure 1.
  • a data communication apparatus includes: an obtaining unit 100, a determining unit 101, and a transceiver unit 102.
  • the obtaining unit 100 is configured to obtain a basic service set BSS identifier in the PPDU after receiving the physical layer protocol data unit (PPDU);
  • PPDU physical layer protocol data unit
  • the determining unit 101 is configured to determine, if the BSS identifier in the PPDU is different from the first BSS identifier, and the BSS identifier in the PPDU is the same as the second BSS identifier, determine whether the PPDU meets a preset spatial multiplexing condition; Narrative a BSS identifier is an identifier of a first BSS to which the network node belongs, the second BSS identifier is an identifier of an extended BSS to which the target relay belongs, and the target relay and the network node belong to the first BSS;
  • the transceiver unit 102 is configured to: when the PPDU meets the preset spatial multiplexing condition, compete for the access channel, and communicate with the station in the first BSS except the target relay.
  • the network node is an access type site in the first BSS
  • the transceiver unit is further configured to receive a preset frame that is reported by the relay, where the preset frame includes an identifier of the extended BSS to which the relay belongs, and the relay and the network node belong to the first BSS.
  • the preset frame includes any one of a data frame, a management frame, and a control frame.
  • the network node is a non-access type site in the first BSS
  • the transceiver unit is further configured to receive a management frame, where the management frame carries an identifier of an extended BSS to which all relays in the first BSS belong, and the management frame is accessed by a first BSS to which the network node belongs. Type site broadcast.
  • the identifier of the extended BSS to which all the relays in the first BSS are carried in the foregoing management frame is an identifier that is reported to the access type site in advance by the relay in the first BSS.
  • the PPDU includes a prohibited spatial multiplexing field
  • the determining unit is further configured to read the value of the forbidden spatial multiplexing field, determine whether the value of the forbidden spatial multiplexing field in the PPDU is an identifier for prohibiting spatial multiplexing, and if yes, prohibit the contention of the channel.
  • the network node after receiving the physical layer protocol data unit PPDU, acquires the basic service set BSS identifier in the PPDU, if the BSS identifier in the PPDU is different from the first BSS identifier, and the PPDU is The BSS identifier is the same as the second BSS identifier, and determines whether the PPDU meets a preset spatial multiplexing condition; the first BSS identifier is an identifier of the first BSS to which the network node belongs, and the second BSS identifier is An identifier of the extended BSS to which the target relay belongs, the target relay and the network node belong to the first BSS; if the PPDU meets a preset spatial multiplexing condition, the access channel is contending with the first BSS The site other than the target relay communicates.
  • This method can solve the data transmission collision problem when spatial multiplexing is performed between different BSSs, realize spatial multiplexing in the relay network, and improve resource utilization.
  • FIG. 5 is a schematic structural diagram of another data communication apparatus according to an embodiment of the present invention.
  • the data communication apparatus may be applied to any network node in a wireless local area network, where the wireless local area network includes a root access point, a root AP, Following the relay and the site STA, where the root AP is associated with multiple relays, each of the multiple relays is associated with one or more of the STAs, and the network node may be a site STA, or may be The root access point is the root AP, or it can be a relay relay, which can be any network node in Figure 1.
  • the data communication device 1000 includes a processor 1010, a memory 1020, and a transceiver 1030.
  • the network node to which the data communication device is applied may be the STA, root AP or relay shown in FIG.
  • the processor 1010 controls the operation of the data communication device 1000.
  • the memory 1020 can include read only memory and random access memory and provides instructions and data to the processor 1010, which can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic. Device. A portion of memory 1020 may also include non-volatile line random access memory (NVRAM).
  • NVRAM non-volatile line random access memory
  • the various components of data communication device 1000 are coupled together by a bus 1040, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, the various buses are labeled as bus systems in the figure. 1040. It should be noted that the above description of the structure of the data communication device can be applied to the subsequent embodiments.
  • the processor 1010 is configured to obtain a basic service set BSS identifier in the PPDU after receiving the physical layer protocol data unit PPDU.
  • the processor 1010 is further configured to: if the BSS identifier in the PPDU is different from the first BSS identifier, and the BSS identifier in the PPDU is the same as the second BSS identifier, determine whether the PPDU meets a preset spatial multiplexing condition.
  • the first BSS identifier is an identifier of the first BSS to which the network node belongs
  • the second BSS identifier is an identifier of the extended BSS to which the target relay belongs, and the target relay and the network node belong to the first BSS;
  • the transceiver 1030 is configured to: if the PPDU meets a preset spatial multiplexing condition, compete for an access channel, and communicate with a station in the first BSS except the target relay.
  • the network node is an access type site in the first BSS
  • the transceiver 1030 is further configured to receive a preset frame that is reported by the relay, where the preset frame includes an identifier of the extended BSS to which the relay belongs.
  • the relay and the network node belong to the first BSS.
  • the preset frame includes any one of a data frame, a management frame, and a control frame.
  • the network node is a non-access type site in the first BSS
  • the transceiver 1030 is further configured to receive a management frame, where the management frame carries an identifier of an extended BSS to which all relays in the first BSS belong.
  • the management frame is broadcast by an access type site within the first BSS to which the network node belongs.
  • the identifier of the extended BSS to which all the relays in the first BSS are carried in the management BSR is an identifier that is reported to the access type site in advance by the relay in the first BSS.
  • the PPDU includes a prohibited spatial multiplexing field
  • the processor 1010 is further configured to read the value of the forbidden spatial multiplexing field, and determine whether the value of the forbidden spatial multiplexing field in the PPDU is set to prohibit spatial multiplexing. The identifier used, if it is, is prohibited from competing for the channel.
  • the network node after receiving the physical layer protocol data unit PPDU, acquires the basic service set BSS identifier in the PPDU, if the BSS identifier in the PPDU is different from the first BSS identifier, and the PPDU is The BSS identifier is the same as the second BSS identifier, and determines whether the PPDU meets a preset spatial multiplexing condition; the first BSS identifier is an identifier of the first BSS to which the network node belongs, and the second BSS identifier is An identifier of the extended BSS to which the target relay belongs, the target relay and the network node belong to the first BSS; if the PPDU meets a preset spatial multiplexing condition, the access channel is contending with the first BSS The site other than the target relay communicates.
  • This method can solve the data transmission collision problem when spatial multiplexing is performed between different BSSs, realize spatial multiplexing in the relay network, and improve resource utilization.
  • the program can be stored in a computer readable storage medium, when the program is executed
  • the flow of the method embodiments as described above may be included.
  • the foregoing storage medium includes various media that can store program codes, such as a ROM or a random access memory RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例公开了一种数据通信方法及装置，该数据通信方法包括：当网络节点接收到PPDU时，获取PPDU中的BSS标识；若所述PPDU中的BSS标识与第一BSS标识不同，且PPDU中的BSS标识与第二BSS标识相同，判断PPDU是否满足预设空间复用条件；第一BSS标识为网络节点所属的第一BSS的标识，第二BSS标识为目标relay所属的扩展BSS的标识，目标relay与网络节点属于第一BSS；若PPDU满足预设空间复用条件，则竞争接入信道，与第一BSS中除目标relay外的站点进行通信。采用本发明实施例，可以解决不同BSS之间进行空间重用时的数据传输碰撞问题。

Description

一种数据通信方法及装置 技术领域
本发明涉及无线网络技术领域，尤其涉及一种数据通信方法及装置。
背景技术
下一代物联网无线保真(wireless fidelity，wifi)协议其中一个目标是长距离传输，802.11ah为了达到长距离传输，引入了多跳中继传输，其中中继(relay)逻辑上实现2个功能，分别为中继-站点(relay station，relay-STA)功能和中继-接入点(relay access point，relay-AP)功能。通常，当中继relay与关联到的上层AP通信时，充当非接入类型站点的功能，即是充当relay-STA；当中继管理的站点与relay通信时，此时relay充当接入类型站点的功能，即是充当relay-AP。每个中继relay和其管理的站点被称为一个基本服务集(Basic Service Set，BSS)，同时每个中继relay和其关联到的上层AP属于另一个BSS，如图1所示，relay1与其关联到的上层root AP属于BSS1(在BSS1中relay充当的是relay-STA功能)，同时relay1和其管理的站点(包括STA1和STA3)被称为BSS2(在BSS2中relay充当的是relay-AP功能)。
为了提高***总吞吐量和频谱利用率，通常各个BSS之间会进行空间重用(Spatial Reuse，SR)，即是多BSS同频同时进行数据传输，具体的，当站点收到来自重叠BSS(Overlapping BSS，OBSS)的数据包后，在满足一定的SR条件时，站点可以竞争信道进行SR传输。
然而在中继网络中，由于中继relay可以同时属于2个BSS，比如图1中的relay1，该relay1的relay1-AP模块属于BSS 2，而relay1-STA模块属于BSS 1，传统的基于BSS标识的多个BSS并发传输会引起传输碰撞问题。比如说，relay1-AP发送PPDU1给STA1，此时root AP收到该PPDU1，但是基于该PPDU1物理层前导码携带的BSS标识判断为OBSS的PPDU，此时接收到的PPDU1满足SR条件时，root AP可以竞争信道发送数据给其管理的站点，若root AP发送数据给relay1-STA。但由于此时relay1正在发送数据，不能同时接收数据，从而导致root AP发送过来的数据无法接收，引起数据传输的碰撞问题。
发明内容
本发明实施例提供一种数据通信方法及装置，可以解决不同BSS之间进行空间重用时的数据传输碰撞问题，提高资源利用率。
一方面，本发明实施例提供一种数据通信方法，用于无线局域网，所述无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay中的每个relay与一个或多个所述STA关联，该方法由无线局域网中的网络节点执行，可选的，该网络节点可以是根接入点root AP，或者是站点STA，或者也可以是中继relay。可选的，当网络节点接收到物理层协议数据单元PPDU时，获取所述PPDU中的基本服务集BSS标识；若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一 BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。
在一种可能的设计中，若所述网络节点在所述第一BSS内为接入类型站点，比如，该网络节点为根接入点root AP，或者该网络节点为中继relay，且该中继relay在所述第一BSS内为relay-AP，则该网络节点在获取所述PPDU中的基本服务集BSS标识之前，还会接收relay上报的预设帧，所述预设帧包含所述relay所属的扩展BSS的标识，所述relay与所述网络节点属于所述第一BSS，可选的，该预设帧可以包括数据帧、管理帧以及控制帧中的任意一种。
在另一种可能的设计中，若所述网络节点在所述第一BSS内为非接入类型站点，比如该网络节点为STA，或者该网络节点为中继relay，且该中继relay在所述第一BSS内为relay-STA，则该网络节点在获取所述PPDU中的基本服务集BSS标识之前，还会接收管理帧，所述管理帧携带所述第一BSS内的所有relay所属的扩展BSS的标识，所述管理帧由所述网络节点所属的第一BSS内的接入类型站点广播。
在另一种可能的设计中，上述管理帧中携带的所述第一BSS内所有relay所属的扩展BSS的标识为该第一BSS内的relay预先向所述接入类型站点上报的该relay所属的扩展BSS的标识。
在另一种可能的设计中，所述PPDU中包括禁止空间复用字段，则网络节点在竞争接入信道之前，网络节点读取所述禁止空间复用字段的值；判断所述PPDU中的禁止空间复用字段的值是否为禁止空间复用的标识，若所述禁止空间复用字段的值被设置为禁止空间复用的标识，则禁止竞争所述信道。
另一方面，本发明实施例提供一种中继网络，该中继网络包括至少两个基本服务集BSS，该至少两个BSS的BSS标识均相同，这样中继网络的各个BSS之间就不能进行空间重用。
另一方面，本发明实施例提供一种数据通信装置，应用于无线局域网中的网络节点，所述无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay中的每个relay与一个或多个所述STA关联，该数据通信装置包括获取单元、判断单元和收发单元，其中，获取单元，用于接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识；判断单元，用于若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；收发单元，用于若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。
另一方面，本发明实施例提供一种数据通信装置，应用于无线局域网中的任意网络节点，该无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay中的每个relay与一个或多个所述STA关联，该数据通信装 置包括存储器，用于存储计算机可执行程序代码；收发器，以及处理器，与所述存储器和所述收发器耦合；
其中所述程序代码包括指令，当所述处理器执行所述指令时，所述指令使所述数据通信装置执行以下操作：接收到物理层协议数据单元PPDU时，获取所述PPDU中的基本服务集BSS标识；若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。再一方面，本发明实施例提供了一种计算机存储介质，用于储存为上述数据通信装置所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
本发明实施例中，当网络节点接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识，若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。这种方式可以解决不同BSS之间进行空间复用时的数据传输碰撞问题，实现中继网络中的空间复用，提高资源利用率。
附图说明
为了更清楚地说明本发明实施例或背景技术中的技术方案，下面将对本发明实施例或背景技术中所需要使用的附图进行说明。
图1是本发明实施例提供的一种应用场景示意图；
图2是本发明实施例提供的一种数据通信方法的流程示意图；
图3是本发明实施例提供的一种BSS color元素示意图；
图4是本发明实施例提供的一种数据通信装置的结构示意图；
图5是本发明实施例提供的另一种数据通信装置的结构示意图。
具体实施方式
本发明实施例可以应用于无线局域网(Wireless Local Area Network，WLAN)，目前WLAN采用的标准为IEEE(英文：Institute of Electrical and Electronics Engineers，中文：电气和电子工程师协会)802.11系列。在802.11ah为了达到长距离传输，引入了多跳中继传输。其中中继站点(relay)逻辑上实现2个功能，分别为中继-站点(relay-STA)功能和中继-接入点(relay Access Point，relay-AP)功能。通常，当中继relay与关联到的上层AP通信时，充当站点的功能(即是实现relay-STA功能)；当中继relay所管理的站点与其通信时，充当接入点的功能(即是实现relay-AP功能)。
WLAN可以包括多个基本服务集BSS，基本服务集中的网络节点为站点，站点包括接 入类型的站点(Access Point，AP)和非接入类型的站点(英文：None Access Point Station，简称：Non-AP STA)，每个基本服务集可以包含一个AP和多个关联于该AP的Non-AP STA。当引入中继relay后，由于中继relay包括两个功能，因此，中继relay通常隶属于两个不同的BSS，中继relay的relay-STA模块隶属于一个BSS，在该BSS内relay属于非接入类型站点，而中继relay的relay-AP模块隶属于另一个BSS，在该另一个BSS内relay属于接入类型站点。
接入类型站点，也称之为无线访问接入点或热点等。接入类型站点是移动用户进入有线网络的接入点，主要部署于家庭、大楼内部以及园区内部，典型覆盖半径为几十米至上百米，当然，也可以部署于户外。接入类型站点相当于一个连接有线网和无线网的桥梁，其主要作用是将各个无线网络客户端连接到一起，然后将无线网络接入以太网。具体地，接入类型站点可以是带有WiFi(英文：Wireless Fidelity,中文：无线保真)芯片的终端设备或者网络设备。可选地，接入类型站点可以为支持802.11ax制式的设备，进一步可选地，该接入类型站点可以为支持802.11ac、802.11n、802.11g、802.11b及802.11a、802.11ah等多种WLAN制式的设备。
非接入类型的站点(英文：None Access Point Station，简称：Non-AP STA)，可以是无线通讯芯片、无线传感器或无线通信终端。例如：支持WiFi通讯功能的移动电话、支持WiFi通讯功能的平板电脑、支持WiFi通讯功能的机顶盒、支持WiFi通讯功能的智能电视、支持WiFi通讯功能的智能可穿戴设备、支持WiFi通讯功能的车载通信设备和支持WiFi通讯功能的计算机。可选地，Non-AP STA可以支持802.11ax制式，进一步可选地，该站点支持802.11ac、802.11n、802.11g、802.11b及802.11a、802.11ah等多种WLAN制式。
而中继relay则是可以集接入类型站点的功能和非接入类型站点的功能的站点，在一个BSS中，中继relay充当接入类型站点，而在另一个BSS中，中继relay充当非接入类型站点。
现有WiFi技术采用载波监听多路访问/冲突检测(Carrier Sense Multiple Access/Collision Derect，CSMA/CA)协议以实现干扰避免，让通过竞争首先获得信道使用权的通信对独占信道资源，只有该通信对通信完毕，周围其他的通信对才可竞争该信道。这种方式对正在通信的链路实现了较好的保护，但在802.11ax的高密度组网情况下，其频谱效率受到了很大的限制。由于处在多个BSS的交叠区域的边缘用户将会受到来自周围多个BSS的干扰，其通信机会及数据吞吐量都将远小于中心用户。因此让边缘用户在OBSS通信对的传输时间内进行空间复用从而提高通信机会和频谱效率在高密度WIFI组网场景下具有重要的意义。
空间复用技术让用户在收到OBSS的on-going数据包的情况下进行并发传输，但空间复用(Spatial Reuse，SR)传输对不能对OBSS的on-going传输对造成干扰。为了实现这一技术，SR节点需要在满足一定条件的情况下才能进行空间复用；另外，现有标准的空闲信道评估(Clear Channel Assessment，CCA)和网络分配矢量(Network Allocation Vector，NAV)规则也需要进行改进从而提高空间复用的机会。
802.11ax在物理层前导码高效字段中引入基本服务集(basic service set，BSS)color字段，该字段用来标识该BSS，帮助接收站点判断接收到的PPDU是否来自于本BSS的。 当该PPDU的物理层前导码高效字段含有的BSS color与该接收站点所在BSS的BSS color相同，则该PPDU为本BSS的数据包，否则为OBSS的数据包。基于BSS color，接收站点可以使用空间重用原则接入信道，或提前终止读取接收到的PPDU，从而节省能量。
空间复用原则：CCA方式即在无线通信***中，当设备需要在某一信道上发送数据之前，首先在这个信道上进行接收，利用接收信号强度(Received Signal Strength Indication，RSSI)来判断信道是否被占用，该RSSI也被称为CCA灵敏度。根据802.11标准，当有效的前导被检测到具有在CCA阈值处或者在CCA阈值以上的RSSI(-82dBm(毫瓦分贝))时，CCA就指示信道处于忙状态。在没有检测到前导的情况下，用于指示信道忙的CCA阈值为-62dBm。如果经过给定的时间，该设备通过CCA方式没有发现有其它设备在此信道上发送数据，则开始发送；如果发现有其他设备在发送数据，则随机避让一段时间后再次重试此过程。
现有WIFI标准采用的是固定阈值的CCA，该阈值设置较低，可在一定程度上规避干扰，但同时也大大降低了密集组网情况下的并发概率。因此，为了提高空间复用的机会，提出了OBSS数据单元(OBSS PD level，OPD)门限，针对OBSS的数据包的信号强度进行检测。
空间复用是一种提高***总吞吐量和频谱利用率的关键技术，当STA收到来自OBSS的数据包后，在满足一定的条件使能进行SR情况下，STA启动OPD门限(OBSS PD level)来进行CCA检测判断，当满足RSSI小于OPD门限的条件时，STA可以竞争信道进行SR传输。
功率节省原则：接收站点一旦接收到PPDU物理层前导码含有的BBS color与本BSS color不同，则可以终止接收该PPDU物理层前导码BSS color字段后续部分(如该PPDU的媒体接入控制层(medium access control，MAC)部分)，从而达到可以节省功率的效果。需要说明的是，若接收站点为中继relay，则接收到PPDU时，需要判断该PPDU物理层前导码携带的BSS color与该relay的relay-STA和relay-AP所在的BSS的BSS color都不一致时，才可以终止接收该PPDU，从而节省功率。
本发明实施例中BSS标识用于唯一标识一个BSS，比如可以是BSS color，AP的MAC地址或者部分MAC地址等等，图1中以BSS标识为BSS color作为举例说明。
本发明实施例中的网络节点可以是站点STA，或者网络节点也可以是根接入点root AP，或者网络节点也可以是中继relay。
本发明实施例的中继relay包括relay-AP模块和relay-STA模块，且该两个模块分别隶属于不同BSS，本发明实施例中将relay与网络节点隶属的相同BSS称为第一BSS，而将relay隶属的另一个BSS称为扩展BSS，如图1所示，若网络节点为root AP，以relay1为例进行举例说明，relay1-STA属于BSS1，而relay1-AP属于BSS2，本发明实施例将relay1-STA与网络节点root AP隶属的BSS称为第一BSS，而将relay1-AP隶属的BSS2称为扩展BSS。
请参照图1，为一个典型的WLAN部署场景的***示意图，如图所示，本实施例的系 统架构中包括三层网络节点，当然本发明实施例仅仅以三层网络节点作为举例，并不对本发明进行限定，本发明可以包括N(N大于或者等于3)层网络节点，比如图1的STA1可以为中继relay3，然后该中继relay3管理多个STA，这样就构成四层网络架构。
其中，图1的网络中包括3个BSS(可以理解的是3个BSS仅为举例，并不对本发明进行限定)。图中的中继relay逻辑上实现2个功能，分别为中继-站点(relay-STA)功能和中继-接入点(relay-AP，access point)功能。通常，当中继relay与关联到的上层AP(如图中的root AP)通信时，充当relay-STA的功能；当中继relay管理的站点与其通信时，如STA 1发送数据包给relay 1，此时relay 1充当relay-AP功能。每个中继relay和其管理的站点被称为一个BSS，比如relay 1，STA 1，STA3为一个BSS。
本发明实施例中的网络节点可以为图1中的root AP或者STA或者中继relay，需要说明的是，若网络节点为中继relay1，则第一BSS可以是图1中的BSS1，也可以是图1中的BSS2，具体确定第一BSS的方法可以是，根据relay1需要通信的站点所属的BSS进行确定，比如relay1需要与STA1通信，则第一BSS为BSS2。
在多跳中继网络中，每个BSS拥有一个BSS color，用来标识该BSS。该BSS color字段放在PPDU的物理层前导码信令字段中或者MAC头中。网络节点接收到PPDU后，可以采用空间重用原则提高并发数据包的传输效率，从而提高网络吞吐率。另外，基于不同BSS color，网络节点可以采用节省功率原则，提前终止接收该PPDU，达到节省功率效果。
如图1所示，采用BSS color，可以提高BSS1，BBS2和BSS3内的站点并发传输的概率。然而由于中继relay可以同时隶属于2个BSS，比如说relay1的relay1-AP属于BSS 2，而relay1-STA属于BSS 1，基于BSS color的多个BSS并发传输会引起数据传输的碰撞问题。比如说，relay1-AP发送PPDU1给STA1，此时root AP收到该PPDU1，但是基于该PPDU1物理层前导码携带的BSS color判断为OBSS的PPDU，此时接收到的PPDU1的RSSI满足小于OPD门限的条件，且PPDU1的RSSI满足SR条件时，root AP可以竞争信道发送数据给其管理的站点，若root AP发送数据给relay1-STA。但由于此时relay1正在发送数据，不能同时接收数据，从而导致root AP发送过来的数据无法接收。再比如，STA1发送PPDU2给relay1-AP，此时root AP收到该PPDU2，但是基于该PPDU2物理层前导码携带的BSS color判断为OBSS的PPDU，此时接收到的PPDU2的RSSI满足小于OPD门限的条件，且PPDU2的RSSI满足SR条件时，root AP可以竞争信道发送数据给其管理的站点，若root AP发送数据给relay1-STA。此时，relay1同时接收到的来自于STA1和root AP的数据包会发生碰撞。
在本发明实施例中，为了解决上述数据传输碰撞问题，在进行空间重用时，不能仅仅采用传统的空间重用原则进行判断，而是需要进一步获取本BSS内所有中继relay所属的扩展BSS的标识，这样网络节点在接收到来自某一个目标relay所属的扩展BSS的PPDU时，则不能与该目标relay进行通信，因为可能会存在数据碰撞问题。
请参照图2，为本发明实施例提供的一种数据通信方法的流程图，本发明实施例的数据通信方法用于无线局域网，该无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay中的每个relay与一个或多个所述STA 关联。本发明实施例的网络节点可以是无线局域网中的任意站点(包括根接入点root AP，中继relay和站点STA中的任意一种)，如图所示，本发明实施例的数据通信方法包括以下步骤：
S200，网络节点接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识；
本发明实施例中，网络节点可以包括接入类型的站点(比如图1中的root AP或者relay-AP)，或者非接入类型的站点(比如图1中的STA或者relay-STA)，中继relay可以为接入类型的站点relay-AP，也可以为非接入类型的站点relay-STA，不同的BSS中，该relay所具有的身份不同。当网络节点接收到PPDU时，即从该PPDU的物理层前导码中解析得到该PPDU中的BSS标识，该PPDU中的BSS标识用于表示该PPDU所来自BSS的标识，需要说明的是，若发送该PPDU的站点为中继relay，则该PPDU中的BSS标识用于标识发送该PPDU的中继relay的模块所属的BSS。如图1所示，若relay1是在BSS1中向AP发送该PPDU，则该PPDU中所包含的BSS标识为relay-STA所属的BSS1的标识。
可选的，若所述网络节点在所述第一BSS内为接入类型站点；
所述获取所述PPDU中包含的基本服务集BSS标识之前，还包括：
网络节点接收relay上报的预设帧，所述预设帧包含所述relay所属的扩展BSS的标识，所述relay与所述网络节点属于所述第一BSS。
可选的，所述预设帧包括数据帧、管理帧和控制帧中的任意一种。
本发明实施例中，若网络节点在第一BSS内为接入类型站点，比如图1中BSS1(第一BSS为BSS1)的root AP，或者BSS2(第一BSS为BSS2)中的relay1-AP，则该第一BSS内所有中继relay向其关联的接入类型站点(即网络节点)汇报其所属的另一个BSS的标识，即是该relay所属的扩展BSS的标识，如图1所示，所有中继relay向该网络节点汇报其relay-AP所在BSS的BSS标识(比如BSS标识可以是BSS color)。
如图1所示，若网络节点为BSS1的root AP，第一BSS为BSS1，则relay1向root AP汇报其relay1-AP所属的扩展BSS的标识(即是BSS2的标识)，relay1-STA属于BSS1；relay2向root AP汇报其relay-AP所属的扩展BSS的标识(即是BSS3的标识)，relay2-STA属于BSS1。
同理，若网络节点为中继relay，该relay在第一BSS为relay-AP，则该第一BSS内的所有relay向该网络节点汇报其自身relay-AP所在的另一个BSS的标识。
具体可选的，各个relay向网络节点汇报BSS color的方法可以为：各个relay通过自身的relay-STA模块向该网络节点发送预设帧，该预设帧的MAC头中携带BSS color，以告知网络节点其relay-AP所在BSS的BSS color；该预设帧可以是数据帧、管理帧或者控制帧中的任意一种。
可选的，若所述网络节点在所述第一BSS内为非接入类型站点；
所述获取所述PPDU中的基本服务集BSS标识之前，还包括：
所述网络节点接收管理帧，所述管理帧携带所述第一BSS内的所有relay所属的扩展BSS的标识，所述管理帧由所述网络节点所属的第一BSS内的接入类型站点广播。
本发明实施例中，若网络节点在第一BSS内为非接入类型站点，比如图1中BSS1(第 一BSS为BSS1)的STA0，或者BSS1(第一BSS为BSS1)中的relay1-STA，或者，若BSS2中relay1-AP管理的站点还包括一个中继relay3，该relay3的relay3-STA隶属于BSS2，则网络节点可以是BSS2(第一BSS为BSS2)中的relay3-STA。
预先第一BSS内的每个relay向其关联的接入类型站点(可以是AP或者relay-AP)汇报其relay-AP所在BSS的BSS color。具体可选的，各个relay汇报BSS color的方法可以为：通过relay-STA模块向其所关联的接入类型站点发送预设帧，该预设帧在MAC头中携带BSS color，以告知其所关联的接入类型站点自身的relay-AP所在BSS的BSS color。该预设帧可以是控制帧、数据帧或者管理帧。
接入类型站点(可以是root AP或者relay-AP)搜集了第一BSS内所有relay所属的扩展BSS的标识，然后接入类型站点在第一BSS内广播其所管理的所有relay-STA共体的relay-AP所在的BSS colors。可选的，广播方式可以是通过信标帧beacon或其他管理帧携带BSS color元素，如图3所示，即是本发明实施例提供的一种BSS color元素的示意图，其中每个relay的BSSID也可以不包括在BSS color元素里。进一步可选的，接入类型站点在广播第一BSS内所有relay所属的扩展BSS的标识时，若该接入类型站点为relay-AP，则广播的管理帧中也可以包括该relay自身的relay-STA所属的BSS的标识。
S201，若所述PPDU中的标识与第一BSS标识不同，且所述PPDU中的标识与第二BSS标识相同，所述网络节点判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；
S202，若所述PPDU满足所述预设空间复用条件，则所述网络节点竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。
本发明实施例中，当网络节点收到PPDU时，首先需要判断该PPDU是否为OBSS的PPDU，即是判断PPDU中所携带的BSS标识是否与该网络节点所属的第一BSS的第一BSS标识相同(需要说明的是，若该网络节点为中继relay，则第一BSS为该中继relay预进行通信的站点所属的BSS)，若该PPDU中的BSS标识与第一BSS不同，则该PPDU为OBSS的PPDU，进一步将该PPDU中的BSS标识与该网络节点所获得的该第一BSS内所有relay所属的扩展BSS的标识进行匹配，若该PPDU中的BSS标识与所有relay中目标relay所属的扩展BSS的第二BSS标识相同，则确定该PPDU为该目标relay所属的扩展BSS的PPDU。需要说明的是，目标relay即是该第一BSS内所有relay中的一个，该目标relay所属的扩展BSS标识与PPDU中的BSS标识能够匹配。
判断该PPDU是否满足预设空间复用条件，即是判断PPDU的RSSI是否满足小于OPD门限的条件，且PPDU的RSSI满足SR条件，若满足预设空间复用条件，则为了能够避免数据传输冲突问题，则该网络节点可以竞争接入信道，并与第一BSS内除目标relay外的站点进行通信，因为该PPDU来自该目标relay所属的扩展BSS，该目标relay可能正在进行接收数据或者发送数据，若向该目标relay进行通信，则可能会导致数据传输冲突问题。
进一步可选的，当网络节点收到OBSS的PPDU时，并且该PPDU物理层前导码携带的BSS color与该网络节点所搜集的第一BSS内所有relay所属的扩展BSS的标识均不一致时，若接收到的PPDU的RSSI满足小于OPD门限的条件，且PPDU的RSSI满足SR条件 时，网络节点可以竞争信道发送数据给第一BSS内的任意站点。
需要说明的是，为了节省功率，如该网络节点为STA或者root AP，接收到OBSS PPDU(BSS color不匹配)，则可以终止接收该PPDU，从而节省功率。若该网络节点为中继relay，则接收到PPDU时，需要判断该PPDU物理层前导码携带的BSS color与该relay的relay-STA和relay-AP所在的BSS的BSS color都不一致时，才可以终止接收该PPDU，从而节省功率。
进一步可选的，所述PPDU中包括禁止空间复用字段；
则本发明实施例中，网络节点在竞争接入信道之前，还会判断所述PPDU中的禁止空间复用字段的值是否为禁止空间复用的标识，若是，则禁止竞争所述信道，若否，则可以竞争接入信道。
本发明实施例中，在多跳中继网络中，每个BSS拥有不同的BSS color，该BSS color只用来做功率节省，具体操作步骤是，每个BSS内站点发送的PPDU的物理层前导码中含有一个禁止空间复用的字段，并且该字段可以设置为禁止空间复用的标识。其他BSS的站点收到该PPDU，就不再进行空间复用，避免其带来的碰撞。
作为另一种可选的实施方式，中继网络中包括至少两个基本服务集BSS，并且该至少两个BSS的BSS标识均相同；这样每个站点解析到PPDU中所携带的BSS color均与自身所属BSS的BSS color相同，就不会进行空间复用。需要说明的是，不同中继网络之间，BSS color可以不同，即是允许不同中继网络之间进行空间复用。
本发明实施例中，当网络节点接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识，若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。这种方式可以解决不同BSS之间进行空间复用时的数据传输碰撞问题，实现中继网络中的空间复用，提高资源利用率。
下面结合附图4至附图5，阐述本发明实施例提供的数据通信装置的具体实现。
请参照图4，为本发明实施例提供的一种数据通信装置的结构示意图，该数据通信装置可以应用于无线局域网中的任意网络节点，所述无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay中的每个relay与一个或多个所述STA关联，该网络节点可以包括是站点STA，也可以是根接入点root AP，或者也可以是中继relay，可以是图1中的任意网络节点。如图4所示，本实施例所述的一种数据通信装置包括：获取单元100、判断单元101和收发单元102。
获取单元100，用于接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识；
判断单元101，用于若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第 一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；
收发单元102，用于若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。
可选的，若所述网络节点在所述第一BSS内为接入类型站点；
所述收发单元还用于接收relay上报的预设帧，所述预设帧包含所述relay所属的扩展BSS的标识，所述relay与所述网络节点属于所述第一BSS。
可选的，所述预设帧包括数据帧、管理帧和控制帧中的任意一种。
可选的，若所述网络节点在所述第一BSS内为非接入类型站点；
所述收发单元还用于接收管理帧，所述管理帧携带所述第一BSS内的所有relay所属的扩展BSS的标识，所述管理帧由所述网络节点所属的第一BSS内的接入类型站点广播。
上述管理帧中携带的所述第一BSS内所有relay所属的扩展BSS的标识为所述第一BSS内的relay预先向所述接入类型站点上报的标识。
可选的，所述PPDU中包括禁止空间复用字段；
所述判断单元还用于读取所述禁止空间复用字段的值，判断所述PPDU中的禁止空间复用字段的值是否为禁止空间复用的标识，若是，则禁止竞争所述信道。
本发明实施例中，当网络节点接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识，若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。这种方式可以解决不同BSS之间进行空间复用时的数据传输碰撞问题，实现中继网络中的空间复用，提高资源利用率。
请参照图5，为本发明实施例提供的另一种数据通信装置的结构示意图，该数据通信装置可以应用于无线局域网中的任意网络节点，所述无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay中的每个relay与一个或多个所述STA关联，该网络节点可以包括是站点STA，也可以是根接入点root AP，或者也可以是中继relay，可以是图1中的任意网络节点。如图5所示，该数据通信装置1000包括处理器1010、存储器1020以及收发器1030。该数据通信装置所应用的网络节点可以为图1中示出的STA、root AP或者relay。
具体地，处理器1010控制数据通信装置1000的操作。存储器1020可以包括只读存储器和随机存取存储器，并向处理器1010提供指令和数据，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件。存储器1020的一部分还可以包括非易失行随机存取存储器(NVRAM)。数据通信装置1000的各个组件通过总线1040耦合在一起，其中总线***1040除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线*** 1040。需要说明的是，上述对于数据通信装置结构的描述，可应用于后续的实施例。
处理器1010，用于接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识；
所述处理器1010还用于若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；
收发器1030，用于若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。
可选的，若所述网络节点在所述第一BSS内为接入类型站点；
所述处理器1010获取所述PPDU中的基本服务集BSS标识之前，所述收发器1030还用于接收relay上报的预设帧，所述预设帧包含所述relay所属的扩展BSS的标识，所述relay与所述网络节点属于所述第一BSS。
其中，所述预设帧包括数据帧、管理帧和控制帧中的任意一种。
可选的，若所述网络节点在所述第一BSS内为非接入类型站点；
所述处理器1010获取所述PPDU中的基本服务集BSS标识之前，所述收发器1030还用于接收管理帧，所述管理帧携带所述第一BSS内的所有relay所属的扩展BSS的标识，所述管理帧由所述网络节点所属的第一BSS内的接入类型站点广播。
可选的，所述管理帧中携带的所述第一BSS内所有relay所属的扩展BSS的标识为所述第一BSS内的relay预先向所述接入类型站点上报的标识。
进一步可选的，所述PPDU中包括禁止空间复用字段；
在所述收发器竞争接入信道之前，所述处理器1010还用于读取所述禁止空间复用字段的值，判断所述PPDU中的禁止空间复用字段的值是否设置为禁止空间复用的标识，若是，则禁止竞争所述信道。
本发明实施例中，当网络节点接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识，若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。这种方式可以解决不同BSS之间进行空间复用时的数据传输碰撞问题，实现中继网络中的空间复用，提高资源利用率。
可以理解的是，上述数据通信装置中各个组件的具体实现方式可以进一步参考方法实施例中的相关描述。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，该流程可以由计算机程序来指令相关的硬件完成，该程序可存储于计算机可读取存储介质中，该程序在执行时，可包括如上述各方法实施例的流程。而前述的存储介质包括：ROM或随机存储记忆体RAM、磁碟或者光盘等各种可存储程序代码的介质。

Claims (11)

  1. 一种数据通信方法，用于无线局域网，所述无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay中的每个relay与一个或多个所述STA关联，其特征在于，包括：
    网络节点接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识；
    若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，所述网络节点判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；
    若所述PPDU满足预设空间复用条件，则所述网络节点竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。
  2. 如权利要求1所述的方法，其特征在于，若所述网络节点在所述第一BSS内为接入类型站点；
    所述获取所述PPDU中的基本服务集BSS标识之前，还包括：
    所述网络节点接收relay上报的预设帧，所述预设帧包含所述relay所属的扩展BSS的标识，所述relay与所述网络节点属于所述第一BSS。
  3. 如权利要求1所述的方法，其特征在于，若所述网络节点在所述第一BSS内为非接入类型站点；
    所述获取所述PPDU中的基本服务集BSS标识之前，还包括：
    所述网络节点接收管理帧，所述管理帧携带所述第一BSS内的所有relay所属的扩展BSS的标识，所述管理帧由所述网络节点所属的第一BSS内的接入类型站点广播。
  4. 如权利要求3所述的方法，其特征在于，所述管理帧中携带的所述第一BSS内所有relay所属的扩展BSS的标识为所述第一BSS内的relay预先向所述接入类型站点上报的标识。
  5. 如权利要求1所述的方法，其特征在于，所述PPDU中包括禁止空间复用字段；所述方法还包括：
    所述网络节点读取所述禁止空间复用字段的值；
    所述网络节点判断所述PPDU中的所述禁止空间复用字段的值是否为禁止空间复用的标识，若是，则禁止竞争所述信道。
  6. 一种数据通信装置，应用于无线局域网中的网络节点，所述无线局域网包括根接入点root AP，中继relay和站点STA，其中，所述root AP与多个relay关联，所述多个relay 中的每个relay与一个或多个所述STA关联，其特征在于，包括：
    获取单元，用于接收到物理层协议数据单元PPDU后，获取所述PPDU中的基本服务集BSS标识；
    判断单元，用于若所述PPDU中的BSS标识与第一BSS标识不同，且所述PPDU中的BSS标识与第二BSS标识相同，判断所述PPDU是否满足预设空间复用条件；所述第一BSS标识为所述网络节点所属的第一BSS的标识，所述第二BSS标识为目标relay所属的扩展BSS的标识，所述目标relay与所述网络节点属于所述第一BSS；
    收发单元，用于若所述PPDU满足预设空间复用条件，则竞争接入信道，与所述第一BSS中除所述目标relay外的站点进行通信。
  7. 如权利要求6所述的装置，其特征在于，若所述网络节点在所述第一BSS内为接入类型站点；
    所述收发单元还用于接收relay上报的预设帧，所述预设帧包含所述relay所属的扩展BSS的标识，所述relay与所述网络节点属于所述第一BSS。
  8. 如权利要求6所述的装置，其特征在于，若所述站点在所述第一BSS内为非接入类型站点；
    所述收发单元还用于接收管理帧，所述管理帧携带所述第一BSS内的所有relay所属的扩展BSS的标识，所述管理帧由所述网络节点所属的第一BSS内的接入类型站点广播。
  9. 如权利要求8所述的装置，其特征在于，所述管理帧中携带的所述第一BSS内所有relay所属的扩展BSS的标识为所述第一BSS内的relay预先向所述接入类型站点上报的标识。
  10. 如权利要求6所述的装置，其特征在于，所述PPDU中包括禁止空间复用字段；
    所述判断单元还用于读取所述禁止空间复用字段的值，判断所述PPDU中的所述禁止空间复用字段的值是否为禁止空间复用的标识，若是，则禁止竞争所述信道。
  11. 一种中继网络，其特征在于，所述中继网络包括至少两个基本服务集BSS，所述至少两个BSS的BSS标识均相同。
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