WO2013037324A1 - 一种对节点进行nav控制的方法、装置、系统及节点 - Google Patents

一种对节点进行nav控制的方法、装置、系统及节点 Download PDF

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Publication number
WO2013037324A1
WO2013037324A1 PCT/CN2012/081493 CN2012081493W WO2013037324A1 WO 2013037324 A1 WO2013037324 A1 WO 2013037324A1 CN 2012081493 W CN2012081493 W CN 2012081493W WO 2013037324 A1 WO2013037324 A1 WO 2013037324A1
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Prior art keywords
mac frame
value
field
mac
txop
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PCT/CN2012/081493
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English (en)
French (fr)
Inventor
杨国瑞
王学寰
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP12831191.7A priority Critical patent/EP2757857B1/en
Publication of WO2013037324A1 publication Critical patent/WO2013037324A1/zh
Priority to US14/196,568 priority patent/US9473283B2/en
Priority to US15/247,560 priority patent/US20160365963A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0808Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, an apparatus, a system, and a node for performing NAV control on a node.
  • the basic component of a wireless local area network (WLAN) based on the IEEE 802.11 technology is a basic service set (BSS), which is within a specific coverage area and has an associated site. (STA, Station) constitutes a second basic service set BSS2 and a third basic service set BSS3 as shown in FIG. 1.
  • a central site with a full-time management BSS in a BSS network is called an Access Point (AP), and other STAs in the network are associated with it.
  • AP Access Point
  • BSS networks can be connected to each other through a distributed system (DS, Distribution System) to form an extended service set (ESS).
  • DS Distribution System
  • ESS extended service set
  • the STAs can also self-organize the network and interact with each other.
  • the network is an independent basic service set (IBSS), the first basic service set BSS1 as shown in Figure 1.
  • IBSS independent basic service set
  • the access point AP and the station STA are collectively referred to. For the node.
  • the distributed nature of channel access of WLAN based on IEEE 802.11 technology makes the carrier sensing mechanism essential for collision-free operation.
  • the physical carrier sensing mechanism logically present in the PHY layer is responsible for detecting the transmission of other nodes.
  • physical carrier sensing may not be able to detect the transmission of all nodes, that is, there is a hidden node problem.
  • the first station STA 1 establishes a data transmission path with the access point AP, and the signal sent from the first station STA1 can be detected by the access point AP and the second station STA2, but for the far
  • the end node third station STA 3 it can only detect the signal sent from the access point AP, and the signal of the first station STA 1 cannot be detected.
  • the third station STA3 may still consider the channel to be in an idle state, thereby causing interference to the access point AP receiving the signal of the first station STA1.
  • the Network Allocation Vector is a mechanism that can be used to overcome the above hidden node problem.
  • the NAV function is located at the MAC layer, which provides virtual carrier monitoring. Mechanism to enhance physical carrier sensing. It is mainly implemented by setting a NAV value in each node. Specifically, when a certain node A sends a MAC frame to a target node, the node A is updated by using the duration field carried by the frame header of the MAC frame. The NAV value of all stations below (except for the target site that successfully demodulates the MAC frame).
  • the duration field contains a time value in microseconds (us), which may be the last physical layer convergence procedue protocol data unit (PLCP, PLCP protocol data unit) that carries the MAC frame. Ending a continuous length of time in which the channel resource is in an occupied state.
  • TXOP Transmit opportunity
  • TXOP Transmission opportunity
  • a node monopolizes channel resources, and can continuously transmit data frames, control frames, and management frames and can receive MAC response frames.
  • TXOP has the longest time limit, and when it is over, it needs to be available again.
  • each access class AC, Access category
  • each access class can also independently obtain the TXOP and exclusively occupy the channel resources.
  • the node that obtains the transmission opportunity is called the TXOP holder, and the node corresponding to the transmission link is called the TXOP responder.
  • the TXOP holder and the TXOP responder set the NAV value for the sites covered by the TXOP holder and the TXOP responder through the first pair of MAC frame exchanges, prohibiting them from accessing the channel resources during the NAV period, unless The MAC response frame is fed back when the TXOP holder requests to become the TXOP responder; during the subsequent TXOP period, the node that sets the NAV will continue to listen to the received MAC frame if the destination address of the detected MAC frame does not match the local address.
  • the local NAV value is updated according to the field value of the duration field in the MAC frame.
  • the TXOP holder finds that the transmission sequence is empty within the TXOP time limit (no service data needs to be transmitted), the TXOP needs to be terminated early, and the remaining duration of the TXOP exceeds the length of the retransmitted CF_End frame, then the TXOP holder issues a CF-End.
  • the frame relinquishes access to the channel resource.
  • the field value of the duration field in the CF End frame is 0, and the other sites under the TXOP holder are heard.
  • the CF-End frame clears the locally stored NAV value according to the field value of the duration field, and can perform channel access competition through the physical carrier sensing mechanism.
  • the inventors have found that the CF-End frame sent by the TXOP holder can only update the NAV value of the station covered by the TXOP holder to 0, and the hidden station cannot receive the CF-End frame because it is not covered by the TXOP holder. Therefore, the NAV value will remain unchanged, and can only continue to wait until the local NAV value decreases to 0 before entering the channel access competition state, and the time to enter the channel access competition state is significantly later than under the TXOP holder coverage. Node. Therefore, the hidden site cannot enter the channel access competition state in time according to the early termination of the TXOP, and thus there is a problem of geographical discrimination of the site.
  • the technical problem to be solved by the present invention is to provide a method, a device, a system, and a node for performing NAV control on a node, which can enable a hidden station to enter a channel access competition state in time, and solve the problem of the site. Regional discrimination.
  • the following technical solutions are used in the embodiments of the present invention:
  • the embodiment of the invention provides a method for performing NAV control on a node, including:
  • the local NAV value is updated to a preset first value, where the first value is smaller than the local current NAV value;
  • the MAC frame carrying the first identifier in a field is sent by the TXOP responder after receiving the last MAC frame sent by the TXOP holder.
  • the embodiment of the invention further provides a method for performing NAV control on a node, including:
  • the first field carries a first identifier, where the first identifier is used to indicate that the node that listens to the MAC response frame updates the local NAV value to the first value.
  • the embodiment of the invention further provides an apparatus for performing NAV control on a node, including:
  • the updating unit is configured to: when the preset first field of the MAC frame that is received is used to carry the first identifier, update the local NAV value to a preset first value, where the first value is smaller than the local current
  • the NAV value is sent: the MAC frame carrying the first identifier in the preset first field is sent by the TXOP responder after receiving the last MAC frame sent by the TXOP holder.
  • An embodiment of the present invention provides an apparatus for performing NAV control on a node, including:
  • a first receiving unit configured to receive a MAC frame sent by a TXOP holder
  • a first sending unit configured to send, according to a field value of the preset second field in the MAC frame, a MAC response frame corresponding to the MAC frame to the TXOP holder, where the MAC frame is the last MAC frame sent by the TXOP holder, where The preset first field of the MAC response frame carries a first identifier, where the first identifier is used to indicate that the node that listens to the MAC response frame updates the local NAV value to the first value.
  • An embodiment of the present invention provides a node, including:
  • the updating unit is configured to: when the preset first field of the MAC frame that is received is used to carry the first identifier, update the local NAV value to a preset first value, where the first value is smaller than the local current NAV value;
  • the MAC frame carrying the first identifier in the preset first field is sent by the TXOP responder after receiving the last MAC frame sent by the TXOP holder.
  • the embodiment of the invention provides a system for performing NAV control on a node, including:
  • a TXOP holder configured to send a last MAC frame to the TXOP responder, where the field value of the preset second field in the last MAC frame is used to indicate that the TXOP responder is the last MAC frame sent by the TXOP holder; receiving the TXOP a MAC address response frame corresponding to the last MAC frame sent by the responder, where the preset first field of the MAC response frame carries a first identifier, where the first identifier is used to indicate that the MAC response frame is detected.
  • the node updates the local NAV value to the first value;
  • a TXOP responder configured to receive a MAC frame sent by the TXOP holder; and when the MAC frame is determined to be the last MAC frame sent by the TXOP holder according to the field value of the preset second field in the MAC frame, send the MAC frame corresponding to the TXOP holder MAC response frame;
  • the first node is configured to: when the preset first field of the MAC frame that is received is used to carry the first identifier, update the local NAV value to a preset first value, where the first value is smaller than a local current NAV value. .
  • the TXOP responder After receiving the last MAC frame sent by the TXOP holder, the TXOP responder sends a MAC response frame carrying the first identifier in the preset first field, and the node located in the coverage of the TXOP responder detects the MAC frame and the local NAV value. Updated to the first value.
  • FIG. 1 is a schematic diagram of a prior art WLAN structure
  • FIG. 3 is a schematic flowchart of a method for performing NAV control on a node according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a second method for performing NAV control on a node according to an embodiment of the present invention
  • FIG. 6 is a schematic flowchart of a method for performing a MAC frame exchange between a TXOP holder and a TXOP responder under a TXOP according to an embodiment of the present invention
  • FIG. 7 is a schematic flowchart of a method for performing NAV control on a node according to a fourth embodiment of the present invention
  • FIG. 8 is a schematic flowchart of a fifth method for performing NAV control on a node according to an embodiment of the present invention
  • FIG. FIG. 10 is a schematic structural diagram of a device for performing NAV control on a node according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a third device for performing NAV control on a node according to an embodiment of the present invention
  • FIG. 12 is a schematic structural diagram of a system for performing NAV control on a node according to an embodiment of the present invention.
  • NAV Network allocation vector
  • TXOP responder TXOP responder
  • TXOP responder TXOP responder
  • the method may be applied to a TXOP.
  • the TXOP responder is in the coverage and is not in the hidden node within the coverage of the TXOP holder.
  • the method includes:
  • Step 301 When it is determined that the first identifier in the preset first field of the detected MAC frame carries the first identifier, the local NAV value is updated to a first value, where the first value is smaller than a local current NAV value;
  • the MAC frame carrying the first identifier in the first field is sent by the TXOP responder after receiving the last MAC frame sent by the TXOP holder.
  • the first value may be preset in each node to perform the update process when the MAC frame carrying the first identifier in the preset first field is detected.
  • the first value may take a value of zero.
  • the first value may be set as: a sum of a short interframe space (SIFS, Short Inter-Frame Space) and a transmission time of the CF-End frame; at this time, when the hidden node updates the NAV value to the first value
  • the NAV value continues to decrease.
  • the TXOP holder will also receive the MAC frame carrying the first identifier in the preset first field, and then send CF-End frame, the NAV value of the node under the TXOP holder coverage is cleared, and the NAV value of the node under the coverage of the hidden node and the TXOP holder is simultaneously updated to 0, which is the competition for channel access.
  • the first field may be a duration field
  • the first identifier may be 0.
  • the local current NAV value is also the local NAV value before the NAV value is updated, that is, the local NAV value when the MAC frame is detected.
  • the TXOP responder After receiving the last MAC frame sent by the TXOP holder, the TXOP responder sends a MAC frame carrying the first identifier in the preset first field, and the node located in the coverage of the TXOP responder detects the MAC frame. When the local NAV value is updated to the first value.
  • the TXOP holder gives up access to the channel resources in advance, all nodes in the coverage of the TXOP holder and the TXOP responder can enter the channel access competition state in time.
  • the problem that the hidden node cannot enter the channel access competition state in time is solved, that is, the problem of regional discrimination of the node is solved.
  • the method may be applied to a TXOP responder in a TXOP. As shown in FIG. 4, the method includes:
  • Step 401 Receive a MAC frame sent by a TXOP holder.
  • Step 402 Send, according to the field value of the preset second field in the MAC frame, that the MAC frame is the last MAC frame sent by the TXOP holder, and send the MAC response frame corresponding to the MAC frame to the TXOP holder, where the MAC response
  • the preset first field of the frame carries a first identifier, where the first identifier is used to indicate that the node that listens to the MAC response frame updates the local NAV value to the first value.
  • the preset first field carries the first identifier to the TXOP holder.
  • the first identifier is used to indicate that the node that listens to the MAC response frame updates the local NAV value to the first value, so that in the TXOP, if the TXOP holder releases or abandons the channel resource connection in advance
  • the hidden node may update the local NAV value to the first value when the MAC response frame of the last MAC frame sent by the TXOP responder is detected, thereby entering the channel access competition state no later than other TXOPs.
  • the node covered by the holder solves the problem that the hidden node cannot enter the channel access competition state in time, that is, solves the problem of regional discrimination of the node.
  • FIG. 5 is a schematic flowchart of a third method for performing NAV control on a node according to an embodiment of the present invention.
  • the method may be applied to a TXOP holder in a TXOP. As shown in FIG. 5, the method includes:
  • Step 501 Send a last MAC frame to the TXOP responder, where the field value of the preset second field in the last MAC frame is used to indicate that the TXOP responder is the last MAC frame sent by the TXOP holder to the TXOP responder.
  • Step 502 Receive a MAC response frame corresponding to the last MAC frame sent by the TXOP responder, where the preset first field of the MAC response frame carries a first identifier, where the first identifier is used to indicate the interception
  • the node to the MAC response frame updates the local NAV value to the first value sculpture
  • the TXOP holder sends the last MAC frame to the TXOP responder, it receives the MAC response frame carrying the first identifier in the preset first field sent by the TXOP responder, thereby performing the MAC frame by cooperating with the TXOP responder.
  • the transmission enables the hidden node under the coverage of the TXOP responder to enter the channel access competition state in time, and solves the problem of regional discrimination of the node.
  • the exchange process between the TXOP holder and the TXOP responder under the TXOP is described by way of an embodiment to further explain the implementation of the method for performing NAV control on the node in the embodiment of the present invention.
  • the step process competes to the channel resource at a certain node, and determines that the TXOP is obtained after the successful first frame exchange. As shown in Figure 6, it includes:
  • Step 601 The TXOP holder sends a MAC frame to the TXOP responder.
  • the MAC frame refers to a MAC layer that includes a set of fields appearing in a given order, each MAC frame includes a MAC frame header, a variable length frame body and a frame containing information specific to the frame type or subtype information. Check the sequence.
  • the MAC frame may be a data frame, a management frame, or a control frame.
  • Not all fields in the MAC frame transmitted by the TXOP holder and the TXOP responder in the MAC layer exchange may occur, and the same field may have different values in different situations.
  • the MAC frame may include: a duration field, a More data field under the frame control field, an acknowledgment policy field under the QoS control field, and the like; wherein, the More data field is used to indicate whether the TXOP holder has a MAC frame after the current transmission.
  • the subsequent frame is sent to the TXOP responder; the acknowledgment policy field is used to indicate whether the TXOP responder needs immediate feedback after receiving the currently sent MAC frame;
  • the duration field is used to detect the non-target node of the MAC frame according to the field value of the duration field. Update of local NAV values.
  • the duration of the MAC frame in the TXOP may be: a remaining duration t r (f TXOP > 0) of the TXOP at the end of the MAC frame transmission.
  • Step 602 The TXOP responder receives the MAC frame, determines whether the TXOP holder has a subsequent frame to be sent, and determines whether the received MAC frame needs immediate feedback. If yes, step 603 is performed; if it is determined that the TXOP holder does not exist If the subsequent frame needs to be sent and the received MAC frame needs immediate feedback, step 604 is performed; otherwise, step 606 is performed.
  • the determining whether the TXOP holder has a subsequent frame to be sent may be determined by using a preset second field in the MAC frame, such as a field value of the More data field. For example, the value of the More data field is set to be 1 in advance.
  • the method of sending may include: parsing the received field value of the More data field of the MAC frame, and if the field value is 1, determining that the TXOP holder has a subsequent frame to be sent to the TXOP responder; otherwise, determining that the TXOP holder has no subsequent frame. Need to send to TXOP responder;
  • determining whether the TXOP holder has a subsequent frame needs to send a similar to the TXOP responder, and determining whether the received MAC frame needs immediate feedback may also be determined by the field value of the acknowledgement policy field in the MAC frame, and details are not described herein again.
  • Step 603 The TXOP responder sends a MAC response frame to the TXOP holder, where the value of the duration field in the MAC response frame may be: the remaining duration of the TXOP at the end of the MAC response frame transmission; xop (f Tx r op > 0).
  • the MAC response frame is also the MAC frame, and may be an ACK frame, a BA frame or another type of MAC frame, and the MAC response frame is only distinguished from the MAC frame sent by the TXOP holder to the TXOP responder.
  • the TXOP holder After performing this step, after receiving the MAC response frame sent by the TXOP responder, the TXOP holder will return to step 601, and the TXOP holder sends the next MAC frame to the TXOP responder.
  • Step 604 The TXOP responder sends a MAC response frame to the TXOP holder, where the preset first field in the MAC response frame carries a first identifier, where the first identifier is used to indicate a node that listens to the response frame.
  • the local NAV value is updated to the first value; step 605 is performed.
  • the first field may be a duration field
  • the first identifier may take a value of 0 as the first identifier, which is not limited herein, as long as other nodes that hear the MAC frame can be based on the first
  • the first identifier in the field clears the local NAV value.
  • Step 605 The TXOP holder sends a CF_End frame to indicate that the node in its coverage clears the local NAV value, and ends the service transmission to the TXOP responder.
  • the node of the non-TXOP responder that is covered by the node clears the local NAV value to enter the channel access competition state, and the TXOP holder ends the service transmission of the TXOP responder.
  • Step 606 If it is determined that the TXOP holder has a subsequent frame to be sent and the received MAC frame does not need to be immediately fed back, the TXOP responder parses the MAC frame without feeding back the MAC response frame, and returns to step 601 to send the TXOP holder to the TXOP responder. a MAC frame; if it is determined that the TXOP holder does not have a subsequent frame to be transmitted and the received MAC frame does not need immediate feedback, the TXOP responder does not perform feedback of the MAC response frame, then the TXOP holder ends the TXOP in the current TXOP Responder's business transmission. During the exchange process between the TXOP holder and the TXOP responder shown in FIG.
  • the node may update the local NAV value according to the field value of the duration field of each MAC frame that is heard.
  • the NAV control process in the other nodes under the coverage of the TXOP holder and the TXOP responder may include:
  • Step 701 Listening to the MAC frame
  • Step 702 Determine whether the first identifier in the preset first field of the detected MAC frame carries the first identifier. If yes, go to step 703; otherwise, go to step 704.
  • the MAC frame carrying the first identifier in the preset first field is also the MAC response frame sent by the TXOP responder to the TXOP holder after receiving the last MAC frame sent by the TXOP holder.
  • the first field is a duration field, and the first identifier may be 0.
  • Step 703 Update the local NAV value to the first value, and enter the channel access competition state.
  • the node compares the field value of the duration field of the detected MAC frame with the local NAV value, and the value of the larger of the two values updates the local NAV; that is, if the field value of the duration field is greater than the local NAV value, the local will be local.
  • the NAV value is updated to the field value of the duration field. If the field value of the duration field is not greater than the local NAV value, the local NAV value is not updated.
  • the node can detect that the MAC frame sent by the TXOP holder can also detect the MAC response frame sent by the TXOP responder, and then the local NAV value is updated when both MAC frames are detected, and the TXOP holder and the TXOP responder perform one.
  • the node needs to update the NAV value twice.
  • the data processing pressure of the node located under the cover of the TXOP holder and under the coverage of the TXOP responder is reduced, so that the data can be located at the same time.
  • the NAV value update of the node covered by the TXOP holder and located under the TXOP responder coverage is only controlled by the TXOP holder.
  • the processing flow of the node includes:
  • Step 801 When the local NAV value of the node is in the zero state, when the first MAC frame is detected, it is determined whether the detected MAC frame is the first MAC frame sent by the TXOP holder, and if yes, step 802 is performed. Otherwise, go to step 805.
  • the local NAV value of the node When the local NAV value of the node is in a zero state, it indicates that the node can perform channel access competition through the physical carrier sensing mechanism. If a MAC frame is detected before the node obtains channel access, it indicates that the channel has been occupied by other nodes. If the MAC frame is parsed, it is known as RTS. The frame indicates that there are other nodes competing for the TXOP, and the first MAC frame sent by the TXOP holder indicates that the node is under the TXOP holder coverage. Otherwise, it indicates that the node is under the TXOP responder coverage.
  • the first frame sent by the TXOP holder is generally an RTS frame. Therefore, the determination in this step can be implemented by determining whether the detected MAC frame is an RTS frame.
  • Step 802 The address of the TXOP holder carried in the MAC frame is saved, and the local NAV value is updated according to the field value of the duration field in the MAC frame. Step 803 is performed.
  • the address of the TXOP holder is also the address of the sending node carried in the MAC frame.
  • step 704 For the implementation of updating the local NAV value in this step, refer to the description in step 704, and details are not described herein.
  • Step 803 Continue to listen to the MAC frame. When detecting, determine whether the sending node address carried in the MAC frame is consistent with the address of the TXOP holder. If yes, go to step 804; otherwise, continue to listen to the MAC frame.
  • Step 804 Update the local NAV value according to the field value of the duration field in the detected MAC frame; return to step 803 to continue to listen to the MAC frame until the local NAV value is cleared, and enter the channel access competition state.
  • step 704 For a specific update method, refer to the related description in step 704, and details are not described herein.
  • the node that is located under the coverage of the TXOP holder and under the coverage of the TXOP responder will update the local NAV value only according to the MAC frame sent by the TXOP holder, and no longer according to the MAC frame sent by the TXOP responder.
  • the update of the local NAV value reduces the data processing pressure of the node both under the TXOP holder cover and under the TXOP responder overlay.
  • Step 805 Determine whether the first identifier is carried in the preset first field of the detected MAC frame. If no, go to step 806; if yes, go to step 807.
  • Step 807 Update the local NAV value to the first value.
  • the node that detects the MAC frame carrying the first identifier in the preset first field updates the local NAV value to 0, and enters the channel access competition state;
  • the first value is the sum of the short frame interval time and the transmission time of the CF-End frame
  • the node that detects the MAC frame carrying the first identifier in the preset first field will continue to reduce the NAV value. Until the NAV value decreases to zero, the channel access competition state is entered.
  • the process of controlling the local NAV value by the hidden node only under the coverage of the TXOP responder is implemented in steps 805 to 807, and the hidden node intercepts the MAC frame carrying the first identifier in the preset first field sent by the TXOP responder. , clear the local NAV value to enter the channel competition state.
  • a transmission mode in which a TXOP holder and a TXOP responder perform one-to-one service transmission is taken as an example.
  • the method for performing NAV control on a node in the embodiment of the present invention may also be used.
  • the TXOP holder Applicable to the TXOP holder to transmit to multiple TXOP responders in time division, or the TXOP holder can transmit to multiple TXOP responders at the same time.
  • the transmission process is decomposed into a transmission process in which a plurality of TXOP holders and TXOP responders perform one-to-one service transmission, and the transmission process of one-to-one service transmission for each TXOP holder and TXOP responder that is decomposed can be used correspondingly.
  • 6 to FIG. 8 is a method of controlling the node NAV, and therefore, no further details are provided here.
  • the embodiment of the present invention further provides a device for performing NAV control on a node.
  • FIG. 9 is a schematic structural diagram of an apparatus for performing NAV control on a node according to an embodiment of the present invention, which may be disposed in a node in a TXOP that is within a coverage of a TXOP responder, and preferably may be disposed in a TXOP within a TXOP responder coverage range. And not in a hidden node within the coverage of the TXOP holder; the device includes:
  • the updating unit 910 is configured to: when the preset first field of the MAC frame that is received is used to carry the first identifier, update the local NAV value to a preset first value, where the first value is smaller than the local current NAV value. And the MAC frame carrying the first identifier in the preset first field is sent by the TXOP responder after receiving the last MAC frame sent by the TXOP holder.
  • the apparatus may further include: a determining unit, configured to: when the local NAV value is in a zero state, when the first MAC frame is detected, determine whether the detected MAC frame is the first MAC frame sent by the TXOP holder;
  • the first processing unit when the MAC frame for detecting is the first MAC frame sent by the TXOP holder, saves the address of the TXOP holder carried in the MAC frame, and updates the local NAV value according to the field value of the duration field in the MAC frame.
  • the local NAV value is updated according to the field value of the duration field in the detected MAC frame;
  • the second processing unit when the MAC frame to be heard is not the first MAC frame sent by the TXOP holder, determines whether the first identifier in the preset first field of the detected MAC frame carries the first identifier, if the update unit is not carried Perform the update operation.
  • the determining unit determines whether the MAC frame detected by the judgment is the first MAC frame sent by the TXOP holder by determining whether the detected MAC frame is an RTS frame.
  • the field value of the segment updates the local NAV value:
  • the value is updated to the field value of the duration field; the NAV value.
  • 10 is a schematic structural diagram of a device for performing NAV control on a node according to an embodiment of the present invention, which may be configured in a TXOP responder; the device includes:
  • the first receiving unit 1010 is configured to receive a MAC frame sent by the TXOP holder;
  • the first sending unit 1020 is configured to: when determining, according to the field value of the preset second field in the MAC frame, that the MAC frame is the last MAC frame sent by the TXOP holder, send the MAC response frame corresponding to the MAC frame to the TXOP holder, where
  • the preset first field of the MAC response frame carries a first identifier, where the first identifier is used to indicate that the node that listens to the MAC response frame updates the local NAV value to the first value.
  • FIG. 11 is a schematic structural diagram of a device for performing NAV control on a node according to an embodiment of the present invention, which may be disposed in a TXOP holder; the device includes:
  • the second sending unit 1110 is configured to send a last MAC frame to the TXOP responder, where the field value of the preset second field in the last MAC frame is used to indicate that the TXOP responder is the last MAC frame sent by the TXOP holder. ;
  • a second receiving unit 1120 configured to receive a MAC response frame corresponding to the last MAC frame sent by the TXOP responder, where the preset first field of the MAC response frame carries a first identifier, where the first identifier is
  • the node for instructing to listen to the MAC response frame updates the local NAV value to the first value.
  • an embodiment of the present invention further provides a node, including:
  • the updating unit is configured to: when the preset first field of the MAC frame that is received is used to carry the first identifier, update the local NAV value to a preset first value, where the first value is smaller than the local current NAV value;
  • the MAC frame carrying the first identifier in the preset first field is sent by the TXOP responder after receiving the last MAC frame sent by the TXOP holder.
  • the node may further include:
  • a first receiving unit configured to receive a MAC frame sent by a TXOP holder
  • a first sending unit configured to send, according to a field value of the preset second field in the MAC frame, a MAC response frame corresponding to the MAC frame to the TXOP holder, where the MAC frame is the last MAC frame sent by the TXOP holder, where The preset first field of the MAC response frame carries a first identifier, where the first identifier is used to indicate that the node that listens to the MAC response frame updates the local NAV value to the first value.
  • the node may further include:
  • a second sending unit configured to send a last MAC frame to the TXOP responder, where the field value of the preset second field in the last MAC frame is used to indicate that the TXOP responder is the last MAC frame sent by the TXOP holder;
  • a second receiving unit configured to receive a MAC response frame corresponding to the last MAC frame sent by the TXOP responder, where the preset first field of the MAC response frame carries the first label
  • the first identifier is used to indicate that the node that listens to the MAC response frame updates the local NAV value to the first value.
  • the node passes the update unit, so that the node can be a node of a non-TXOP holder or a non-TXOP responder covered by a TXOP holder or a TXOP responder in the TXOP; and the node can be used as a TXOP in the TXOP by the first receiving unit and the first sending unit.
  • the responder is configured to cooperate with the TXOP holder for service transmission; the second transmitting unit and the second receiving unit can make the node act as a TXOP responder in the TXOP to cooperate with the TXOP responder for service transmission.
  • the embodiment of the present invention further provides a system for performing NAV control on a node, as shown in FIG. 12, including:
  • the TXOP holder1 is configured to send a last MAC frame to the TXOP responder, where the field value of the preset second field in the last MAC frame is used to indicate that the TXOP responder is the last MAC frame sent by the TXOP holder; a MAC address response frame corresponding to the last MAC frame sent by the responder, where the preset first field of the MAC response frame carries a first identifier, where the first identifier is used to indicate that the MAC response frame is detected.
  • the node updates the local NAV value to the first value;
  • the TXOP responder 1220 is configured to receive a MAC frame sent by the TXOP holder, and send the MAC frame to the TXOP holder when determining that the MAC frame is the last MAC frame sent by the TXOP holder according to the field value of the preset second field in the MAC frame. Corresponding MAC response frame;
  • the first node 1230 is configured to: when the preset first field of the MAC frame that is received is used to carry the first identifier, update the local NAV value to a preset first value, where the first value is smaller than the local current NAV. value.
  • the first value may be 0 or may be the sum of a short frame interval time and a transmission time of a CF-End frame.
  • the preset second field may be: a More data field; the preset first field may be a duration field; and the first identifier may be 0.
  • the TXOP responder sends the MAC address frame carrying the first identifier in the preset first field when receiving the last MAC frame sent by the TXOP holder, and the node located in the coverage of the TXOP responder detects the When the MAC frame is used, the local NAV value is updated to the first value.
  • the hidden node may update the local NAV value to the first value by using the MAC response frame carrying the first identifier in the first field sent by the TXOP responder, thereby hiding
  • the time when the node enters the channel access competition state is not later than the time when the node under the TXOP holder covers the channel access competition state, so that all nodes in the coverage of the TXOP holder and the TXOP responder can enter the channel to enter the competition state in time.
  • the problem that the hidden node cannot enter the channel access competition state in time is solved, that is, the problem of regional discrimination of the node is solved.

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Abstract

本发明公开了一种对节点进行NAV控制的方法、装置、系统及节点,所述方法包括:判断侦听到的MAC帧的预设第一字段中携带第一标识时,将本地的NAV值更新为预设第一数值,所述第一数值小于本地的当前NAV值;所述预设第一字段中携带第一标识的MAC帧由TXOP responder接收到TXOP holder发送的最后一个MAC帧后发送。该方法、装置、系统及节点能够使得隐藏站点也可及时进入信道接入竞争状态,解决站点的地域性歧视问题。

Description

一种对节点进行 NAV控制的方法、 装置、 系统及节点 技术领域 本发明涉及通信领域,尤其涉及一种对节点进行 NAV控制的方法、装置、 系统及节点。 背景技术 基于 IEEE 802.11技术的无线局域网( WLAN, Wireless local area network ) 的基本组成部分是基本服务集(BSS, Basic service set ), 其由某一特定覆盖 区域之内, 并具有某种关联的站点(STA, Station )组成, 如图 1所示的第二 基本服务集 BSS2和第三基本服务集 BSS3。在 BSS网络中具有专职管理 BSS 的中央站点被称为接入点(AP, Access point ), 而在该网络中的其它站点 STA 都与它相关联。 多个 BSS网络通过分布式系统(DS, Distribution system )相 互连接即可组成扩展服务集(ESS, Extended service set )„ 另夕卜, 在 AP缺失 的情况下, 站点 STA也可以自组网络而相互直接通信, 此网络即为独立基本 服务集(IBSS, Independent basic service set ), 如图 1所示的第一基本服务集 BSS1。 本发明实施例中, 将所述接入点 AP和站点 STA统称为节点。
基于 IEEE 802.11技术的 WLAN的信道接入的分布式本质使得载波侦听 机制对于无碰撞的操作至关重要, 逻辑上存在于 PHY层中的物理载波侦听机 制负责检测其它节点的传输。 然而由于诸如地理位置的原因, 物理载波侦听 可能无法探测到所有节点的传输, 也即存在隐藏节点问题。 举例来说, 如图 2 所示, 第一站点 STA 1与接入点 AP建立数据传输路径, 从第一站点 STA1发 出的信号可以被接入点 AP和第二站点 STA2检测到 ,但是对于远端节点第三 站点 STA 3而言, 其仅可以检测到从接入点 AP发出的信号,检测不到第一站 点 STA 1的信号。当第一站点 STA 1向接入点 AP发送信号时,第三站点 STA3 有可能仍认为信道处于空闲状态,从而对接入点 AP接收第一站点 STA1的信 号造成干扰。
网络分配向量( NAV, Network allocation vector )是一种可以用于克服上 述隐藏节点问题的机制。 NAV功能位于 MAC层, 其通过提供虚拟载波监听 机制来增强物理载波侦听。其主要是通过在各个节点中设置 NAV值来实现的, 具体的, 当某一节点 A在向某一目标节点发送 MAC帧时, 利用 MAC帧的帧 头承载的时长字段,更新该节点 A覆盖下所有站点的 NAV值(成功解调 MAC 帧的目标站点除外)。 时长字段包含一个以微秒(us )为单位的时间值, 该值 可以为从承载该 MAC帧的最后一个物理层会聚过程 ( PLCP, Physical layer convergence procedue )协议数据单元 ( PPDU, PLCP protocol data unit )结束 算起信道资源处于被占用状态的一个连续的时间长度。
在 802.11e 中引入了另一个重要概念即传输机会 (TXOP , Transmit opportunity ), 是指节点可以传输特定通信类别的有界时段, 其可以通过竟争 周期的竟争机制获得。 在 TXOP时限内, 某一节点独占信道资源, 可以连续 传输数据帧、 控制帧和管理帧且可以接收 MAC响应帧。 TXOP有最长时限, 当其结束后需要再竟争方可获得。 相应的, 在增强分布式信道接入(EDCA, Enhanced distributed channel access )中, 每个接入类另 ll ( AC, Access category ) 也可以独立获得 TXOP, 独占所述信道资源。 其中, 获得传输机会的节点被称 为 TXOP 持有者 (TXOP holder ), 而与之对应建立传输链路的节点被称为 TXOP响应者( TXOP responder )。
TXOP holder成功获得 TXOP后,在 TXOP时限内, TXOP holder和 TXOP responder通过首对 MAC帧交换为 TXOP holder和 TXOP responder覆盖下的 站点设置 NAV值, 禁止他们在该 NAV时段内接入信道资源, 除非被 TXOP holder请求成为 TXOP responder时反馈 MAC响应帧; 在后续的 TXOP时段 内, 设置 NAV的节点将继续侦听其接收到的 MAC帧, 如果侦听到的 MAC 帧的目的地址与本地地址不匹配 ,则根据 MAC帧中的时长字段的字段值更新 本地的 NAV值, 如果目的地址与本地地址匹配, 则本地存储的 NAV值不更 新; 另外, 各个节点中的 NAV值将会随着时间不断减小, 直到 NAV值为 0 时, 被设置 NAV值的节点才可通过物理载波侦听机制进行信道接入的竟争。 而如果 TXOP holder在 TXOP时限内发现传输序列为空 (没有业务数据需要 传输), 需要提前结束 TXOP, 且本次 TXOP的剩余时长超过再发送 CF— End 帧的时长,则 TXOP holder发出 CF— End帧放弃对信道资源的接入权, CF End 帧中的时长字段的字段值为 0 , 则 TXOP holder覆盖下的其他站点侦听到 CF— End帧, 按照时长字段的字段值将本地存储的 NAV值清零, 可以通过物 理载波侦听机制进行信道接入的竟争。
但是, 发明人发现, TXOP holder发出的 CF— End帧只能使 TXOP holder 覆盖下的站点的 NAV值更新为 0,而隐藏站点由于不在 TXOP holder覆盖下, 无法收到所述 CF— End帧, 因此其 NAV值将不变, 只能继续等待直到本地的 NAV值减小为 0时, 才可进入信道接入竟争状态, 进入信道接入竟争状态的 时间明显晚于位于 TXOP holder覆盖下的节点。由此隐藏站点不能根据 TXOP 提前终止的情况及时的进入信道接入竟争状态, 从而存在站点的地域性歧视 问题。 发明内容 有鉴于此, 本发明要解决的技术问题是, 提供一种对节点进行 NAV控制 的方法、 装置、 系统及节点, 能够使得隐藏站点也可及时进入信道接入竟争 状态, 解决站点的地域性歧视问题。 为此, 本发明实施例釆用如下技术方案:
本发明实施例提供一种对节点进行 NAV控制的方法, 包括:
判断侦听到的 MAC帧的预设第一字段中携带第一标识时,将本地的 NAV 值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第 一字段中携带第一标识的 MAC帧由 TXOP responder接收到 TXOP holder发 送的最后一个 MAC帧后发送。
本发明实施例还提供一种对节点进行 NAV控制的方法, 包括:
接收 TXOP holder发来的 MAC帧;
根据 MAC帧中预设第二字段的字段值判断该 MAC帧为 TXOP holder发 送的最后一个 MAC帧时, 向 TXOP holder发送所述 MAC帧对应的 MAC响 应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一标识, 所述第一标 识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值更新为第一数值。
本发明实施例还提供一种对节点进行 NAV控制的装置, 包括:
更新单元, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标识 时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第一字段中携带第一标识的 MAC帧由 TXOP responder接 收到 TXOP holder发送的最后一个 MAC帧后发送。
本发明实施例提供一种对节点进行 NAV控制的装置, 包括:
第一接收单元, 用于接收 TXOP holder发来的 MAC帧;
第一发送单元, 用于根据 MAC帧中预设第二字段的字段值判断该 MAC 帧为 TXOP holder发送的最后一个 MAC帧时,向 TXOP holder发送所述 MAC 帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一 标识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值 更新为第一数值。
本发明实施例提供一种节点, 包括:
更新单元, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标识 时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第一字段中携带第一标识的 MAC帧由 TXOP responder接 收到 TXOP holder发送的最后一个 MAC帧后发送。
本发明实施例提供一种对节点进行 NAV控制的系统, 包括:
TXOP holder, 用于向 TXOP responder发送最后一个 MAC帧, 所述最后 一个 MAC帧中预设第二字段的字段值用于指示 TXOP responder所述 MAC帧 为 TXOP holder发送的最后一个 MAC帧; 接收 TXOP responder发来的所述 最后一个 MAC帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一 字段中携带第一标识,所述第一标识用于指示侦听到该 MAC响应帧的节点将 本地的 NAV值更新为第一数值;
TXOP responder, 用于接收 TXOP holder发来的 MAC帧; 根据 MAC帧 中预设第二字段的字段值判断该 MAC帧为 TXOP holder发送的最后一个 MAC帧时, 向 TXOP holder发送所述 MAC帧对应的 MAC响应帧;
第一节点, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标识 时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值。
对于上述技术方案的技术效果分析如下: TXOP responder接收到 TXOP holder发送的最后一个 MAC帧后发送预设 第一字段中携带第一标识的 MAC响应帧, 位于 TXOP responder覆盖范围内 的节点侦听到该 MAC帧时, 将本地的 NAV值更新为第一数值。 从而, 即使 TXOP holder提前放弃对于信道资源的接入权, 隐藏节点也可以通过 TXOP responder发送的第一字段中携带第一标识的 MAC响应帧将本地的 NAV值更 新为第一数值,从而使得隐藏节点进入信道接入竟争状态的时间不晚于 TXOP holder覆盖下节点进入信道接入竟争状态的时间 , 从而 TXOP holder和 TXOP responder覆盖范围内的所有节点都可以及时进入信道进入竟争状态, 解决了 隐藏节点无法及时进入信道接入竟争状态的问题, 也即解决了节点的地域性 歧视问题。 附图说明 图 1为现有技术 WLAN结构示意图;
图 2为现有技术隐藏节点问题的示例图;
图 3为本发明实施例第一种对节点进行 NAV控制的方法流程示意图; 图 4为本发明实施例第二种对节点进行 NAV控制的方法流程示意图; 图 5为本发明实施例第三种对节点进行 NAV控制的方法流程示意图; 图 6为本发明实施例 TXOP holder与 TXOP responder在 TXOP下进行 MAC帧交换的方法流程示意图;
图 7为本发明实施例第四种对节点进行 NAV控制的方法流程示意图; 图 8为本发明实施例第五种对节点进行 NAV控制的方法流程示意图; 图 9为本发明实施例第一种对节点进行 NAV控制的装置结构示意图; 图 10为本发明实施例第二种对节点进行 NAV控制的装置结构示意图; 图 11为本发明实施例第三种对节点进行 NAV控制的装置结构示意图; 图 12为本发明实施例对节点进行 NAV控制的系统结构示意图。 具体实施方式 以下, 结合附图详细说明本发明实施例一种对节点进行网络分配向量 ( NAV, Network allocation vector )控制的方法、 装置、 系统及节点的实现。 图 3为本发明实施例一种对节点进行 NAV控制的方法流程示意图, 该方 法可以适用于 TXOP中位于 TXOP响应者( TXOP responder )覆盖范围内的 节点中, 优选地, 可以适用于 TXOP中位于 TXOP responder覆盖范围内、 且 不位于 TXOP持有者( TXOP holder )覆盖范围内的隐藏节点中。如图 3所示, 该方法包括:
步骤 301 : 判断侦听到的 MAC帧的预设第一字段中携带第一标识时, 将 本地的 NAV值更新为第一数值, 所述第一数值小于本地的当前 NAV值; 所 述预设第一字段中携带第一标识的 MAC帧由 TXOP responder接收到 TXOP holder发送的最后一个 MAC帧后发送。
所述第一数值可以预先设置于各个节点中, 以便侦听到预设第一字段中 携带第一标识的 MAC帧时, 进行所述更新处理。
另外, 所述第一数值可以取值为 0。
优选地,第一数值可以设置为:短的帧间距( SIFS, Short Inter-Frame Space ) 时间与 CF— End帧的发送时间之和; 此时, 当隐藏节点将 NAV值更新为第一 数值后, NAV值继续减小,在隐藏节点的 NAV值从第一数值减小为 0的时间 内, TXOP holder也将接收到所述预设第一字段中携带第一标识的 MAC帧, 之后, 发送 CF— End帧, 实现 TXOP holder覆盖下节点的 NAV值清零, 且隐 藏节点与 TXOP holder覆盖下的节点的 NAV值同时更新为 0 , —起进行信道 接入的竟争。
优选地, 所述第一字段可以为时长字段, 所述第一标识可以为 0。
这里 , 本地的当前 NAV值也即为进行所述 NAV值更新之前本地的 NAV 值, 也即侦听到所述 MAC帧时本地的 NAV值。
图 3所示的方法中, TXOP responder接收到 TXOP holder发送的最后一个 MAC帧后发送预设第一字段中携带第一标识的 MAC帧,位于 TXOP responder 覆盖范围内的节点侦听到该 MAC帧时, 将本地的 NAV值更新为第一数值。 从而 , 即使 TXOP holder提前放弃对于信道资源的接入权, TXOP holder和 TXOP responder覆盖范围内的所有节点都可以及时进入信道接入竟争状态, 解决了隐藏节点无法及时进入信道接入竟争状态的问题, 也即解决了节点的 地域性歧视问题。
图 4为本发明实施例另一种对节点进行 NAV控制的方法, 该方法可以适 用于 TXOP中的 TXOP responder; 如图 4所示, 该方法包括:
步骤 401: 接收 TXOP holder发来的 MAC帧;
步骤 402: 根据 MAC帧中预设第二字段的字段值判断该 MAC帧为 TXOP holder发送的最后一个 MAC帧时, 向 TXOP holder发送所述 MAC帧对应 的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一标识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值更新为 第一数值。
图 4所示的方法中, TXOP responder接收到 TXOP holder发来的 MAC帧 时,判断该 MAC帧为 TXOP holder发送的最后一个 MAC帧时,向 TXOP holder 发送预设第一字段中携带第一标识的 MAC响应帧,所述第一标识用于指示侦 听到该 MAC响应帧的节点将本地的 NAV值更新为第一数值, 从而在 TXOP 中,如果 TXOP holder释放或者提前放弃对信道资源的接入权时, 隐藏节点可 以在侦听到 TXOP responder发送的所述最后一个 MAC帧的 MAC响应帧时 , 将本地的 NAV值更新为第一数值, 从而进入信道接入竟争状态不晚于其他 TXOP holder覆盖下的节点,解决了隐藏节点无法及时进入信道接入竟争状态 的问题, 也即解决了节点的地域性歧视问题。
图 5为本发明实施例第三种对节点进行 NAV控制的方法流程示意图, 该 方法可以适用于 TXOP中的 TXOP holder, 如图 5所示, 该方法包括:
步骤 501 : 向 TXOP responder发送最后一个 MAC帧, 所述最后一个 MAC帧中预设第二字段的字段值用于指示 TXOP responder所述 MAC帧为 TXOP holder向该 TXOP responder发送的最后一个 MAC帧;
步骤 502: 接收 TXOP responder发来的所述最后一个 MAC帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一标识, 所 述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值更新为第 —数值„ 图 5所示的方法中, TXOP holder向 TXOP responder发送最后一个 MAC帧后,接收 TXOP responder发来的预设第一字段中携带第一标识的 MAC 响应帧 ,从而通过与 TXOP responder配合进行 MAC帧的传输,使得位于 TXOP responder覆盖下的隐藏节点能够及时进入信道接入竟争状态的问题, 解决了 节点的地域性歧视问题。 以下, 通过实施例来描述在 TXOP下, TXOP holder与 TXOP responder 之间的交换过程, 以进一步详细说明本发明实施例对节点进行 NAV控制的方 法的实现。 具体的, 该步骤流程在某一节点竟争到信道资源, 并通过成功的 首帧交换确定了获得本次 TXOP之后执行。 如图 6所示, 包括:
步骤 601: TXOP holder向 TXOP responder发送 MAC帧;
所述 MAC帧是指 MAC层中包含一个按给定顺序出现的字段集, 每个 MAC帧都包含一个 MAC帧头、 一个包含特定于帧类型或子类型信息的可变 长度帧体和一个帧校验序列。 所述 MAC帧可以是数据帧、 管理帧或者控制帧 等。
TXOP holder与 TXOP responder在 MAC层交换所传输的 MAC帧中不是 所有字段都出现, 同时相同字段在不同情况下的取值可能不同。
例如, MAC帧中可以包括: 时长字段、 帧控制字段下的 More data字段、 QoS控制字段下的确认策略字段等; 其中, More data字段用于指示 TXOP holder在当前发送的 MAC帧之后是否还有后续帧向 TXOP responder发送;确 认策略字段则用于指示 TXOP responder接收到当前发送的 MAC帧之后是否 需要立刻反馈;时长字段用于侦听到 MAC帧的非目的节点根据该时长字段的 字段值进行本地 NAV值的更新。
其中, TXOP中 MAC帧的时长取值可以为: TXOP在该 MAC帧发送结 束时刻的剩余时长 tr (fTXOP > 0)。
步骤 602: TXOP responder接收到所述 MAC帧, 判断 TXOP holder是否 还有后续帧需要发送, 并且判断接收到的 MAC帧是否需要立刻反馈,如果均 为是, 则执行步骤 603; 如果判断 TXOP holder没有后续帧需要发送且接收到 的 MAC帧需要立刻反馈, 则执行步骤 604; 否则, 执行步骤 606。 其中,所述判断 TXOP holder是否还有后续帧需要发送可以通过 MAC帧 中的某一预设第二字段如 More data字段的字段值进行判断, 例如, 预先设定 More data字段的取值为 1时, 表示 TXOP holder还有后续帧需要向 TXOP responder发送, 而取值为 0时, 表示 TXOP holder没有后续帧需要向 TXOP responder发送,则本步骤中判断 TXOP holder是否还有后续帧需要向 TXOP responder发送的方法可以包括: 解析接收到的所述 MAC帧的 More data字段 的字段值, 字段值为 1时, 则判断 TXOP holder还有后续帧需要向 TXOP responder发送, 否则, 判断 TXOP holder没有后续帧需要向 TXOP responder 发送;
与判断 TXOP holder是否还有后续帧需要向 TXOP responder发送类似的, 判断接收到的 MAC帧是否需要立刻反馈也可以通过 MAC帧中的确认策略字 段的字段值进行判断, 这里不再赘述。
步骤 603: TXOP responder向 TXOP holder发送 MAC响应帧, 其中, 所 述 MAC响应帧中的时长字段的取值可以为: TXOP在该 MAC响应帧发送结 束时刻的剩余时长 f;xop (fTx r op > 0)。
这里, 所述 MAC响应帧也是所述 MAC帧, 可以为 ACK帧、 BA帧或者 其它类型的 MAC帧, 称为 MAC响应帧仅为了与 TXOP holder向 TXOP responder发送的 MAC帧进行区别。
执行完本步骤, TXOP holder接收到 TXOP responder发送的 MAC响 应帧后, 将转回步骤 601 , 由 TXOP holder向 TXOP responder发送下一个 MAC帧。
步骤 604: TXOP responder向 TXOP holder发送 MAC响应帧, 其中, 所 述 MAC响应帧中的预设第一字段中将携带第一标识,所述第一标识用于指示 侦听到该响应帧的节点将本地的 NAV值更新为第一数值; 执行步骤 605。
一般的, 所述第一字段可以为时长字段, 所述第一标识可以取值为 0作 为所述第一标识, 这里并不限定, 只要其他侦听到所述 MAC帧的节点能够根 据第一字段中的第一标识将本地的 NAV值清零即可。 执行完本步骤, TXOP holder接收到 TXOP responder发送的 MAC响应帧 后,则 TXOP holder已经通过 MAC响应帧得知对于信道资源的接入权的释放 完成, 则执行步骤 605。
步骤 605: TXOP holder发送 CF— End帧, 以指示自身覆盖内的节点将本 地的 NAV值清零, 结束对所述 TXOP responder的业务传输。
通过 TXOP holder发送所述 CF— End帧,则其覆盖下的非 TXOP responder 的节点将本地的 NAV值清零, 从而进入信道接入竟争状态, TXOP holder对 所述 TXOP responder的业务传输结束。
步骤 606: 如果判断 TXOP holder有后续帧需要发送且接收到的 MAC帧 不需要立刻反馈, 则 TXOP responder解析该 MAC帧不反馈 MAC响应帧, 此 时返回步骤 601 , 由 TXOP holder向 TXOP responder发送下一个 MAC帧; 如 果判断 TXOP holder没有后续帧需要发送且接收到的 MAC帧不需要立刻反 馈, 则 TXOP responder不进行 MAC响应帧的反馈, 则在本次 TXOP中所述 TXOP holder结束对所述 TXOP responder的业务传输。 在以上图 6所示的 TXOP holder与 TXOP responder之间的交换过程中, 位于 TXOP holder与 TXOP responder覆盖下的其他节点一直在持续对 MAC 帧进行侦听,位于 TXOP holder覆盖下的节点可以侦听到 TXOP holder发送给 TXOP responder的 MAC帧, 而位于 TXOP responder覆盖下的节点可以侦听 到 TXOP responder反馈给 TXOP holder的 MAC响应帧。
其中,在侦听过程中, 节点可以根据侦听到的每个 MAC帧的时长字段的 字段值进行本地 NAV值的更新。此时,如图 7所示 ,位于 TXOP holder与 TXOP responder覆盖下的所述其他节点中的 NAV控制过程可以包括:
步骤 701 : 侦听 MAC帧;
步骤 702: 判断侦听到的 MAC帧的预设第一字段中是否携带第一标识, 如果是, 执行步骤 703; 否则, 执行步骤 704。
其中, 预设第一字段中携带第一标识的 MAC帧也即为所述 TXOP responder接收到 TXOP holder发送的最后一个 MAC帧后发送给 TXOP holder 的 MAC响应帧。 优选地, 所述第一字段为时长字段, 所述第一标识可以为 0。
步骤 703: 将本地的 NAV值更新为第一数值, 进入信道接入竟争状态。
以包括:
节点比较侦听到的 MAC帧的时长字段的字段值与本地 NAV值, 取两者 中数值较大的值更新本地的 NAV;也即,如果时长字段的字段值大于本地 NAV 值, 则将本地 NAV值更新为所述时长字段的字段值, 如果时长字段的字段值 不大于本地 NAV值, 则不进行本地 NAV值的更新。
在图 7所示的方法中, 仅位于 TXOP holder覆盖下的节点将只能侦听到 TXOP holder发送给 TXOP responder的 MAC帧, 因此, 根据该 MAC帧进行 本地 NAV的更新; 而仅位于 TXOP responder覆盖下的节点将只能侦听到 TXOP responder发送给 TXOP holder的所述 MAC响应帧 , 因此根据该 MAC 响应帧进行本地 NAV的更新 , 而既位于 TXOP holder覆盖下又位于 TXOP responder覆盖下的节点则既能侦听到 TXOP holder发送的 MAC帧也能侦听到 TXOP responder发送的 MAC响应帧 , 则侦听到两种 MAC帧时都进行本地 NAV值的更新 , 则 TXOP holder与 TXOP responder进行一轮 MAC帧的交换 时, 该节点需要进行两次 NAV值的更新。
优选地, 为了减少既位于 TXOP holder覆盖下又位于 TXOP responder 覆盖下的节点进行 NAV值更新的次数, 降低既位于 TXOP holder覆盖下又位 于 TXOP responder覆盖下的节点的数据处理压力,可以让既位于 TXOP holder 覆盖下又位于 TXOP responder覆盖下的节点的 NAV值更新仅受 TXOP holder控制, 此时, 如图 8所示, 节点的处理流程包括:
步骤 801 : 当节点的本地的 NAV值处于零值状态时,侦听到第一个 MAC 帧时, 判断侦听到的 MAC帧是否为 TXOP holder发送的首个 MAC帧, 如果 是, 执行步骤 802, 否则, 执行步骤 805。
当节点本地的 NAV值处于零值状态时, 表示节点可以通过物理载波侦听 机制进行信道接入的竟争。 如果在节点未获得信道接入前, 侦听到一个 MAC 帧时, 表明信道已经被其他节点占用, 如果通过解析该 MAC帧获知为 RTS 帧, 则表明有其他节点竟争到 TXOP, 且是 TXOP holder发送的首个 MAC帧 则表明节点位于 TXOP holder覆盖下, 否则,表明该节点位于 TXOP responder 覆盖下。
这里, TXOP holder发送的首帧一般为 RTS帧, 因此, 这里可以通过判断 侦听到的 MAC帧是否是 RTS帧实现本步骤中的所述判断。
步骤 802: 保存 MAC帧中携带的 TXOP holder的地址, 根据 MAC帧中 时长字段的字段值更新本地的 NAV值; 执行步骤 803。
所述 TXOP holder的地址也即为 MAC帧中携带的发送节点地址。
本步骤中所述更新本地 NAV值的实现可以参照步骤 704中的描述, 这里 不赘述。
步骤 803: 继续侦听 MAC帧, 侦听到时, 判断 MAC帧中携带的发送节 点地址与所述 TXOP holder的地址是否一致, 如果是, 执行步骤 804; 否则, 继续侦听 MAC帧。
步骤 804: 根据侦听到的 MAC帧中时长字段的字段值更新本地的 NAV 值; 返回步骤 803中继续侦听 MAC帧, 直至本地 NAV值清零, 进入信道接 入竟争状态。
具体的更新方法可以参照步骤 704中的相关描述, 这里不赘述。
通过步骤 802〜步骤 804的循环处理, 既位于 TXOP holder覆盖下又位于 TXOP responder覆盖下的节点将只根据 TXOP holder发送的 MAC帧进行本地 NAV值的更新,不再根据 TXOP responder发送的 MAC帧进行本地 NAV值的 更新, 从而降低了既位于 TXOP holder覆盖下又位于 TXOP responder覆盖下 的所述节点的数据处理压力。
步骤 805: 判断侦听到的 MAC帧的预设第一字段中是否携带第一标识, 如果否, 执行步骤 806; 如果是, 执行步骤 807。 步骤 807: 将本地的 NAV值更新为第一数值。
其中,当第一数值为 0时,则侦听到预设第一字段中携带第一标识的 MAC 帧的节点将本地的 NAV值更新为 0, 进入信道接入竟争状态; 而当第一数值为短的帧间距时间与 CF— End帧的发送时间之和时 ,侦听到 预设第一字段中携带第一标识的 MAC帧的节点将继续进行 NAV值的减小, 直至 NAV值减小到零时, 进入信道接入竟争状态。
通过步骤 805〜步骤 807实现了仅位于 TXOP responder覆盖下的隐藏节点 进行本地 NAV值控制的过程,所述隐藏节点通过侦听到 TXOP responder发送 的预设第一字段中携带第一标识的 MAC帧, 将本地 NAV值清零, 进入信道 竟争状态。 在图 6〜图 8所示的实施例中, 以 TXOP holder和 TXOP responder一对一 进行业务传输的传输模式为例, 在实际应用中, 本发明实施例的对节点进行 NAV控制的方法也可以适用于 TXOP holder分时向多个 TXOP responder进行 传输,或者, TXOP holder同时向多个 TXOP responder进行传输的业务传输模 式下.在 TXOP holder同时或者分时向多个 TXOP responder进行传输时, 都可 以将传输过程分解为多个 TXOP holder和 TXOP responder一对一进行业务传 输的传输过程, 对于分解出来的每一个 TXOP holder和 TXOP responder一对 一进行业务传输的传输过程, 都可以对应使用本发明图 6〜图 8所示的进行节 点 NAV的控制方法, 因此, 这里不再赘述。 与上述的方法相对应的, 本发明实施例还提供对节点进行 NAV控制的装 置。
图 9为本发明实施例第一种对节点进行 NAV控制的装置结构示意图, 可 以设置于 TXOP中位于 TXOP responder覆盖范围内的节点中, 优选地, 可以 设置于于 TXOP中位于 TXOP responder覆盖范围内、 且不位于 TXOP holder 覆盖范围内的隐藏节点中; 该装置包括:
更新单元 910, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标 识时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第一字段中携带第一标识的 MAC帧由 TXOP responder接 收到 TXOP holder发送的最后一个 MAC帧后发送。
优选地, 如图 9所示, 该装置还可以包括: 判断单元, 用于当本地的 NAV值处于零值状态时, 侦听到第一个 MAC 帧时, 判断侦听到的 MAC帧是否为 TXOP holder发送的首个 MAC帧;
第一处理单元, 用于侦听到的 MAC帧是 TXOP holder发送的首个 MAC 帧时, 保存 MAC帧中携带的 TXOP holder的地址, 根据 MAC帧中时长字段 的字段值更新本地的 NAV值, 后续侦听到 MAC帧时, 判断 MAC帧中携带 的发送节点地址与所述 TXOP holder的地址一致时,根据侦听到的 MAC帧中 时长字段的字段值更新本地的 NAV值;
第二处理单元,用于侦听到的 MAC帧不是 TXOP holder发送的首个 MAC 帧时, 判断侦听到的 MAC帧的预设第一字段中是否携带第一标识, 如果未携 一更新单元执行所述更新操作。
优选地, 所述判断单元通过判断侦听到的 MAC帧是否为 RTS帧实现所 述判断侦听到的 MAC帧是否为 TXOP holder发送的首个 MAC帧。 段的字段值更新本地的 NAV值: 值更新为时长字段的字段值; 的 NAV值。 图 10为本发明实施例第二种对节点进行 NAV控制的装置结构示意图, 可以设置于 TXOP responder中; 该装置包括:
第一接收单元 1010, 用于接收 TXOP holder发来的 MAC帧;
第一发送单元 1020, 用于根据 MAC帧中预设第二字段的字段值判断该 MAC帧为 TXOP holder发送的最后一个 MAC帧时, 向 TXOP holder发送所 述 MAC帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中 携带第一标识,所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值更新为第一数值。 图 11为本发明实施例第三种对节点进行 NAV控制的装置结构示意图, 可以设置于 TXOP holder中; 该装置包括:
第二发送单元 1110, 用于向 TXOP responder发送最后一个 MAC帧, 所 述最后一个 MAC帧中预设第二字段的字段值用于指示 TXOP responder所述 MAC帧为 TXOP holder发送的最后一个 MAC帧;
第二接收单元 1120,用于接收 TXOP responder发来的所述最后一个 MAC 帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一 标识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值 更新为第一数值。 另外, 本发明实施例还提供一种节点, 包括:
更新单元, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标识 时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第一字段中携带第一标识的 MAC帧由 TXOP responder接 收到 TXOP holder发送的最后一个 MAC帧后发送。
另外, 该节点还可以包括:
第一接收单元, 用于接收 TXOP holder发来的 MAC帧;
第一发送单元, 用于根据 MAC帧中预设第二字段的字段值判断该 MAC 帧为 TXOP holder发送的最后一个 MAC帧时,向 TXOP holder发送所述 MAC 帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一 标识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值 更新为第一数值。
另外, 该节点还可以包括:
第二发送单元, 用于向 TXOP responder发送最后一个 MAC帧, 所述最 后一个 MAC帧中预设第二字段的字段值用于指示 TXOP responder所述 MAC 帧为 TXOP holder发送的最后一个 MAC帧;
第二接收单元, 用于接收 TXOP responder发来的所述最后一个 MAC帧 对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一标 识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值更 新为第一数值。
所述节点通过更新单元, 使得节点可以作为 TXOP中 TXOP holder或 TXOP responder覆盖下的非 TXOP holder或非 TXOP responder的节点; 而通 过第一接收单元和第一发送单元使得节点可以作为 TXOP中的 TXOP responder, 以便与 TXOP holder配合进行业务传输; 通过第二发送单元和第二 接收单元可以使得节点作为 TXOP中的 TXOP responder, 以便与 TXOP responder配合进行业务传输。 另外, 本发明实施例还提供一种对节点进行 NAV控制的系统, 如图 12 所示, 包括:
TXOP holderl210, 用于向 TXOP responder发送最后一个 MAC帧, 所述 最后一个 MAC帧中预设第二字段的字段值用于指示 TXOP responder所述 MAC帧为 TXOP holder发送的最后一个 MAC帧; 接收 TXOP responder发来 的所述最后一个 MAC帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预 设第一字段中携带第一标识,所述第一标识用于指示侦听到该 MAC响应帧的 节点将本地的 NAV值更新为第一数值;
TXOP responder 1220 ,用于接收 TXOP holder发来的 MAC帧;根据 MAC 帧中预设第二字段的字段值判断该 MAC帧为 TXOP holder发送的最后一个 MAC帧时, 向 TXOP holder发送所述 MAC帧对应的 MAC响应帧;
第一节点 1230, 用于判断侦听到的 MAC帧的预设第一字段中携带第一 标识时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当 前 NAV值。 优选地, 在以上所述的装置、 节点以及系统中, 所述第一数值可以为 0 或者可以为短的帧间距时间与 CF— End帧的发送时间之和。
所述预设第二字段可以为: 更多数据(More data )字段; 所述预设第一 字段可以为时长字段; 所述第一标识可以为 0。 上述的装置、节点以及系统中, TXOP responder接收到 TXOP holder发送 的最后一个 MAC帧时发送预设第一字段中携带第一标识的 MAC响应帧, 位 于 TXOP responder覆盖范围内的节点侦听到该 MAC帧时, 将本地的 NAV值 更新为第一数值。 从而, 即使 TXOP holder提前放弃对于信道资源的接入权, 隐藏节点也可以通过 TXOP responder发送的第一字段中携带第一标识的 MAC响应帧将本地的 NAV值更新为第一数值, 从而使得隐藏节点进入信道 接入竟争状态的时间不晚于 TXOP holder覆盖下节点进入信道接入竟争状态 的时间 , 从而 TXOP holder和 TXOP responder覆盖范围内的所有节点都可以 及时进入信道进入竟争状态, 解决了隐藏节点无法及时进入信道接入竟争状 态的问题, 也即解决了节点的地域性歧视问题。 本领域普通技术人员可以理解, 实现上述实施例的方法的过程可以通过 程序指令相关的硬件来完成, 所述的程序可以存储于可读取存储介质中, 该 程序在执行时执行上述方法中的对应步骤。 所述的存储介质可以如:
ROM/RAM, 磁碟、 光盘等。 以上所述仅是本发明的优选实施方式, 应当指出, 对于本技术领域的普 通技术人员来说, 在不脱离本发明原理的前提下, 还可以做出若干改进和润 饰, 这些改进和润饰也应视为本发明的保护范围。

Claims

权 利 要 求
1、 一种对节点进行 NAV控制的方法, 其特征在于, 包括:
判断侦听到的 MAC帧的预设第一字段中携带第一标识时,将本地的 NAV 值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第 一字段中携带第一标识的 MAC帧由 TXOP responder接收到 TXOP holder发 送的最后一个 MAC帧后发送。
2、 根据权利要求 1所述的方法, 其特征在于, 所述第一数值为 0或者短 的帧间距时间与 CF— End帧的发送时间之和。
3、 根据权利要求 1所述的方法, 其特征在于, 还包括:
当本地的 NAV值处于零值状态时, 侦听到第一个 MAC帧时, 判断侦听 到的 MAC帧是否为 TXOP holder发送的首个 MAC帧;
侦听到的 MAC帧是 TXOP holder发送的首个 MAC帧时, 保存 MAC帧 中携带的 TXOP holder的地址,根据 MAC帧中时长字段的字段值更新本地的 NAV值,后续侦听到 MAC帧时,判断 MAC帧中携带的发送节点地址与所述 TXOP holder的地址一致时, 根据侦听到的 MAC帧中时长字段的字段值更新 本地的 NAV值;
侦听到的 MAC帧不是 TXOP holder发送的首个 MAC帧时, 判断侦听到 的 MAC帧的预设第一字段中是否携带第一标识, 如果未携带, 根据 MAC帧 中时长字段的字段值更新本地的 NAV值,如果携带,执行所述将本地的 NAV 值更新为第一数值的步骤。
4、 根据权利要求 3所述的方法, 其特征在于, 判断侦听到的 MAC帧是 否为 TXOP holder发送的首个 MAC帧包括:
判断侦听到的 MAC帧是否为 RTS帧。
5、 根据权利要求 1至 4任一项所述的方法, 其特征在于, 所述预设第一 字段为时长字段; 所述第一标识为 0。
6、 根据权利要求 3或 4所述的方法, 其特征在于, 所述根据 MAC帧中 时长字段的字段值更新本地的 NAV值包括: 值更新为时长字段的字段值; 的 NAV值。
7、 一种对节点进行 NAV控制的方法, 其特征在于, 包括:
接收 TXOP holder发来的 MAC帧;
根据 MAC帧中预设第二字段的字段值判断该 MAC帧为 TXOP holder发 送的最后一个 MAC帧时, 向 TXOP holder发送所述 MAC帧对应的 MAC响 应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一标识, 所述第一标 识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值更新为第一数值。
8、根据权利要求 7所述的方法, 其特征在于, 所述预设第二字段为: 更 多数据字段; 所述预设第一字段为时长字段; 所述第一标识为 0。
9、 一种对节点进行 NAV控制的装置, 其特征在于, 包括:
更新单元, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标识 时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第一字段中携带第一标识的 MAC帧由 TXOP responder接 收到 TXOP holder发送的最后一个 MAC帧后发送。
10、 根据权利要求 9所述的装置, 其特征在于, 所述第一数值为 0或者 短的帧间距时间与 CF— End帧的发送时间之和。
11、 根据权利要求 9所述的装置, 其特征在于, 还包括:
判断单元, 用于当本地的 NAV值处于零值状态时, 侦听到第一个 MAC 帧时, 判断侦听到的 MAC帧是否为 TXOP holder发送的首个 MAC帧;
第一处理单元, 用于侦听到的 MAC帧是 TXOP holder发送的首个 MAC 帧时, 保存 MAC帧中携带的 TXOP holder的地址, 根据 MAC帧中时长字段 的字段值更新本地的 NAV值, 后续侦听到 MAC帧时, 判断 MAC帧中携带 的发送节点地址与所述 TXOP holder的地址一致时,根据侦听到的 MAC帧中 时长字段的字段值更新本地的 NAV值;
第二处理单元,用于侦听到的 MAC帧不是 TXOP holder发送的首个 MAC 帧时, 判断侦听到的 MAC帧的预设第一字段中是否携带第一标识, 如果未携 一更新单元执行所述更新操作。
12、 根据权利要求 11所述的装置, 其特征在于, 判断单元通过判断侦听 到的 MAC帧是否为 RTS帧实现所述判断侦听到的 MAC帧是否为 TXOP holder发送的首个 MAC帧。
13、 根据权利要求 9至 12任一项所述的装置, 其特征在于, 所述预设第 一字段为时长字段; 所述第一标识为 0。
14、 根据权利要求 11或 12所述的装置, 其特征在于, 第二处理单元通
值更新为时长字段的字段值; 的 NAV值。
15、 一种对节点进行 NAV控制的装置, 其特征在于, 包括:
第一接收单元, 用于接收 TXOP holder发来的 MAC帧;
第一发送单元, 用于根据 MAC帧中预设第二字段的字段值判断该 MAC 帧为 TXOP holder发送的最后一个 MAC帧时,向 TXOP holder发送所述 MAC 帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一 标识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值 更新为第一数值。
16、 根据权利要求 15所述的装置, 其特征在于, 所述预设第二字段为: 更多数据字段; 所述预设第一字段为时长字段; 所述第一标识为 0。
17、 一种节点, 其特征在于, 包括:
更新单元, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标识 时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值; 所述预设第一字段中携带第一标识的 MAC帧由 TXOP responder接 收到 TXOP holder发送的最后一个 MAC帧后发送。
18、 根据权利要求 17所述的节点, 其特征在于, 还包括:
第一接收单元, 用于接收 TXOP holder发来的 MAC帧;
第一发送单元, 用于根据 MAC帧中预设第二字段的字段值判断该 MAC 帧为 TXOP holder发送的最后一个 MAC帧时,向 TXOP holder发送所述 MAC 帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一 标识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值 更新为第一数值。
19、 根据权利要求 17或 18所述的节点, 其特征在于, 还包括: 第二发送单元, 用于向 TXOP responder发送最后一个 MAC帧, 所述最 后一个 MAC帧中预设第二字段的字段值用于指示 TXOP responder所述 MAC 帧为 TXOP holder发送的最后一个 MAC帧;
第二接收单元, 用于接收 TXOP responder发来的所述最后一个 MAC帧 对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一字段中携带第一标 识, 所述第一标识用于指示侦听到该 MAC响应帧的节点将本地的 NAV值更 新为第一数值。
20、 一种对节点进行 NAV控制的系统, 其特征在于, 包括:
TXOP holder, 用于向 TXOP responder发送最后一个 MAC帧, 所述最后 一个 MAC帧中预设第二字段的字段值用于指示 TXOP responder所述 MAC帧 为 TXOP holder发送的最后一个 MAC帧; 接收 TXOP responder发来的所述 最后一个 MAC帧对应的 MAC响应帧, 其中, 所述 MAC响应帧的预设第一 字段中携带第一标识,所述第一标识用于指示侦听到该 MAC响应帧的节点将 本地的 NAV值更新为第一数值;
TXOP responder, 用于接收 TXOP holder发来的 MAC帧; 根据 MAC帧 中预设第二字段的字段值判断该 MAC帧为 TXOP holder发送的最后一个 MAC帧时, 向 TXOP holder发送所述 MAC帧对应的 MAC响应帧;
第一节点, 用于判断侦听到的 MAC帧的预设第一字段中携带第一标识 时, 将本地的 NAV值更新为预设第一数值, 所述第一数值小于本地的当前 NAV值。
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