WO2013159552A1 - 无线帧的接收方法及装置 - Google Patents

无线帧的接收方法及装置 Download PDF

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Publication number
WO2013159552A1
WO2013159552A1 PCT/CN2012/087539 CN2012087539W WO2013159552A1 WO 2013159552 A1 WO2013159552 A1 WO 2013159552A1 CN 2012087539 W CN2012087539 W CN 2012087539W WO 2013159552 A1 WO2013159552 A1 WO 2013159552A1
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WO
WIPO (PCT)
Prior art keywords
radio frame
station
receiving
frame
indication
Prior art date
Application number
PCT/CN2012/087539
Other languages
English (en)
French (fr)
Inventor
邢卫民
吕开颖
孙波
田开波
姜静
韩志强
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US14/396,657 priority Critical patent/US9883530B2/en
Priority to EP12875055.1A priority patent/EP2846573A4/en
Publication of WO2013159552A1 publication Critical patent/WO2013159552A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0225Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0238Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is an unwanted signal, e.g. interference or idle signal
    • 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications, and in particular to a method and an apparatus for receiving a radio frame.
  • WLAN wireless local area network
  • IEEE Institute for Electrical and Electronic Engineers
  • the 802.11n task group proposed high throughput (HT) requirements, introducing multiple inputs and multiple outputs (Multiple Input). Multiple Output (referred to as MIMO) and beamforming technology, supporting data rates up to 600Mbps
  • the 802.11ac task group further proposed the concept of Very High Throughput (VHT), by introducing greater channel bandwidth, Technologies such as higher-order MIMO and multi-user multiple-input multiple-output (MU-MIMO) can achieve data rates of more than 1 Gbps.
  • VHT Very High Throughput
  • the 802.11ah task group which was just established, its main task is to modify and enhance the WLAN media access control layer (MAC) and the physical layer protocol (Physical Layer Protocol, PHY for short).
  • MAC WLAN media access control layer
  • PHY Physical Layer Protocol
  • EDCA is an enhanced mode of operation.
  • the CSMA/CA mechanism is used to enable multiple different priority queues to share wireless channels and to reserve transmission opportunities (Transmission Opportunity (TXOP).
  • TXOP Transmission Opportunity
  • the different priority queues are called access levels. Category, referred to as AC).
  • the station waits for an interframe interval plus a random backoff time detection channel, when the channel is in When the waiting time is idle, the station can access the channel. If the station starts channel contention access after receiving a packet correctly, the waiting interframe space is the normal interframe space, and the normal interframe space under DCF is DIFS (DCF interframe Space), AIFS (Arbitration Interframe Space) under EDCA.
  • DIFS DCF interframe Space
  • AIFS Aribitration Interframe Space
  • the interframe space is an extended interframe space, which is equal to a normal frame used after correct reception.
  • the short inter-frame interval is the inter-frame interval that the target receiver needs to respond immediately after receiving the radio frame to itself.
  • Site C is a hidden site.
  • 802.11 proposes a virtual channel detection mechanism, that is, by including reserved channel time information in the frame header of the radio frame, and other listening sites that receive the radio frame containing the time reservation information set a network allocation vector stored locally ( The Network Allocation Vector (NAV) is set to the maximum value of the time reservation information.
  • NAV Network Allocation Vector
  • the sender sends a request to send frame (Request To Send, referred to as RTS) for channel reservation
  • the RTS includes channel reservation time information
  • the receiver responds to the acknowledge transmission frame (Clear To Send, referred to as CTS) for channel reservation confirmation
  • CTS also Channel reservation time information is included to ensure that the sender can complete subsequent data frame exchange.
  • the schematic diagram of setting the NAV is as shown in FIG. 2.
  • the general data frame exchange process includes the sender sending a data frame, and the target receiver successfully receives the reply response frame.
  • the channel time NAV of the RTS/CTS reservation in FIG. 2 may include multiple frame exchanges.
  • the data reservation frame and the response frame may also include channel reservation time information.
  • the data frame may be directly transmitted without using the channel time reserved by the RTS/CTS, and the channel reservation time and the data frame are carried in the data frame and the response frame.
  • the reservation time information includes at least the transmission time of the response frame of the current frame exchange, and may also include the time of the next frame exchange.
  • a radio frame generally includes a PHY Protocol Data Unit (PPDU) and a PHY Service Data Unit (PSDU).
  • PPDU PHY Protocol Data Unit
  • PSDU PHY Service Data Unit
  • the layer header portion contains only the training sequence and signaling indications needed to decode the PSDU, such as an indication of the coded modulation scheme.
  • the physical layer header portion adds part of the identifier information of the receiver.
  • the STA may abandon receiving the physical layer load part of the PPDU, and the NAV setting value is in the physical layer load part, and then abandoning the receiving PPDU does not update its own NAV.
  • Identification information mainly refers to partial association identification information (Partial AID) and group identification information (Group ID).
  • Partial AID partial association identification information
  • Group ID group identification information
  • the PPDU is a SU PPDU
  • the Group ID and the Partial AID in the physical frame header indicate that the STA cannot be the target receiver, that is, the Partial AID indicated in the radio frame is different from the Partial AID of the STA, or in the radio frame.
  • the group ID is 0, but the STA is not an AP or a Mesh STA.
  • the PPDU is a MU PPDU
  • the STA is not in the MU packet indicated by the Group ID in the frame, or the number of space-time flows indicated by the STA in the MU packet indicated by the Group ID in the frame but the MU packet location where the STA is located is 0.
  • the receiving operation processing procedure of the STA having the discarded PPDU without updating the NAV function is not given, so that the STA cannot implement the abandonment of receiving the PPDU and does not Update NAV.
  • the prior art does not consider the problems that may occur after discarding the PPDU, which may cause problems such as sending collisions.
  • station B sends a radio frame to station A
  • C is a listening station. Since station A and station C are hidden sites, site C determines that the PPDU sent by station B does not contain itself by detecting the physical frame header. Data, and Site C chooses to discard the PPDU and does not update the NAV.
  • Site B sends the PPDU
  • Site A will reply to the Site B after the short interframe space (SIFS), and Site C does not update its NAV and cannot detect the response frame signal sent by Site B.
  • SIFS short interframe space
  • the present invention provides a problem in the prior art in that a receiving operation process flow of an STA having a discarded PPDU without updating the NAV function is caused, and the PPDU is discarded without updating the NAV function, or the collision is not transmitted.
  • a radio frame reception and channel contention access scheme to solve at least one of the above problems.
  • a method for receiving a radio frame including: a first functional entity of a station detects that a channel signal strength reaches a predetermined threshold, and the first functional entity starts to receive a radio frame, and sends the radio frame to the station.
  • the second functional entity sends an indication that the channel detection result is busy;
  • the first functional entity determines that the station is not the target receiving station of the radio frame, and sends a reception end indication of the radio frame to the second functional entity;
  • the first functional entity sends an indication that the channel detection result is idle to the second functional entity.
  • the first functional entity determines that the site is not a target receiving station of the radio frame, and includes: the first functional entity determining identity identification information indicated by a physical layer header portion of the radio frame and the The identity information of the site does not match, or the group identifier indicated by the physical layer header portion of the radio frame indicates that the target site of the radio frame is an access point or a wireless mesh network Mesh site, and the site is not accessed.
  • the station is not the target receiving station of the radio frame; or, the first functional entity determining that the group identifier corresponding to the group identifier indicated by the physical layer header portion of the radio frame is not the station a packet, or a number of spatio-temporal flows indicated in the packet when the station is within the packet, indicating that the radio frame does not include data of the station, determining that the station is not a target receiving of the radio frame Site.
  • the receiving end indication includes: a reason for receiving the end or a status information of the end of the receiving, wherein the reason for the end of the receiving end or the status information of the end of the receiving includes one of the following: the partial identity or the group identifier does not match, or The site is a non-target receiver, or the site actively discards the frame.
  • the method further includes: the first functional entity according to the signaling indication of the physical layer frame header of the radio frame The information determines the time at which the transmission of the radio frame ends, and keeps the indication of the channel busy before the end of the radio frame transmission.
  • the receiving end indication includes: a reason for receiving the end or a status information of the end of the receiving, wherein the reason for the end of the receiving end or the status information of the end of the receiving includes one of the following: the partial identity or the group identifier does not match, or The site is a non-target receiver, or the site actively discards the frame.
  • the one interframe interval time is an extended interframe interval time, wherein the extended interframe interval time is a short interframe interval time, a transmission time of a response frame, and a case where a correct frame is received. The sum of the interframe intervals used.
  • the transmission time of the response frame is a time calculated according to a lowest rate of the rate set supported by the station and a predefined response frame acknowledgement frame.
  • the receiving end indication further includes: indication information of the response frame of the radio frame, where the indication information of the response frame includes: indication information of whether the radio frame needs to reply to the response frame, and The type information of the response frame in the case of a response frame.
  • the inter-frame interval time is a short interframe interval time, and an interframe space used when a correct frame is received.
  • the sum of the time and the transmission time of one of the response frames; if the indication information of the response frame indicates that the radio frame does not need to reply to the response frame, the predetermined time is when a correct frame is received The interframe time used.
  • the transmission time of the response frame is a time determined according to a predefined rate and type information of the response frame.
  • the receiving end indication includes: a reason for receiving the end or a status information of the end of the receiving, wherein the reason for the end of the receiving end or the status information of the end of the receiving includes one of the following: the partial identity or the group identifier does not match, or The site is a non-target receiver, or the site actively discards the frame.
  • the device further includes: a second determining module, configured to: according to the first layer determining module, when the first determining module determines that the station is not a target receiving station of the radio frame, according to a physical layer header of the radio frame
  • the indication information is determined as the time at which the transmission of the radio frame ends, and the indication that the channel is kept busy before the end of the transmission of the radio frame.
  • the receiving end indication includes: a reason for receiving the end or a status information of the end of the receiving, wherein the reason for the end of the receiving end or the status information of the end of the receiving includes one of the following: the partial identity or the group identifier does not match, or The site is a non-target receiver, or the site actively discards the frame.
  • the one interframe interval time is an extended interframe interval time, wherein the extended interframe interval time is a short interframe interval time, a transmission time of a response frame, and a case where a correct frame is received. The sum of the interframe intervals used.
  • a station including: a receiving device for a radio frame and a channel competing access device, where the receiving device of the radio frame includes: a first sending module, configured to detect The channel signal strength reaches a predetermined threshold, starts to receive the radio frame, and sends an indication that the channel detection result is busy to the access device competing for the channel; the first determining module is configured to determine that the station is not the target receiving station of the radio frame And a second sending module, configured to: when the first determining module determines that the station is not the target receiving station of the radio frame, send a radio end reception end indication to the channel competing access device; a module, configured to transmit a channel detection node to an access device that competes for the channel when the radio frame transmission ends
  • the access device of the channel competition includes: a first receiving module, configured to receive a receiving end indication of a radio frame sent by the receiving device of the radio frame; and a determining module, configured to receive according to the receiving Ending the indication that the station is not the target
  • the first determining module includes: a first determining unit, configured to determine that the identity information indicated by the physical layer header portion of the radio frame does not match the identity information of the site, or the radio frame
  • the group identifier indicated by the frame header portion of the physical layer indicates that the target site of the radio frame is an access point or a wireless mesh network Mesh site, and the site is not an access point or a mesh site, then it is determined that the site is not the a target receiving station of the radio frame
  • a second determining unit configured to determine that the group corresponding to the group identifier indicated by the physical layer header portion of the radio frame is not the packet where the station is located, or when the station is in the group
  • the number of spatio-temporal streams indicated in the packet indicates that the data of the station is not included in the radio frame, and it is determined that the station is not a target receiving station of the radio frame.
  • the receiving apparatus of the radio frame further includes: a second determining module, configured to: according to the physical layer of the radio frame, when the first determining module determines that the station is not a target receiving station of the radio frame
  • the signaling indication information of the frame header determines the time at which the radio frame transmission ends, and keeps the indication of the channel busy before the end of the radio frame transmission.
  • the receiving end indication includes: a reason for receiving the end or a status information of the end of the receiving, wherein the reason for the end of the receiving end or the status information of the end of the receiving includes one of the following: the partial identity or the group identifier does not match, or
  • the site is a non-target receiver, or the site actively discards the frame.
  • the one interframe interval time is an extended interframe interval time, wherein the extended interframe interval time is a short interframe interval time, a transmission time of a response frame, and a case where a correct frame is received.
  • the receiving end indication further includes: indication information of the response frame of the radio frame, where the indication information of the response frame includes: indication information of whether the radio frame needs to reply to the response frame, and The type information of the response frame in the case of a response frame.
  • the inter-frame interval time is a short interframe interval time, and an interframe space used when a correct frame is received.
  • the one interframe interval time is an interframe interval time used in the case where a correct frame is received.
  • the first functional entity of the station detects that the channel signal strength reaches a predetermined threshold, starts receiving the radio frame, and sends an indication that the channel detection result is busy to the second functional entity of the station; the first functional entity determines that the station is not a radio frame Receiving, by the target receiving station, a receiving end indication of the radio frame to the second functional entity; at the end of the radio frame transmission, the first functional entity sends an indication that the channel detection result is idle to the second functional entity, providing a discarded radio frame
  • FIG. 1 is a schematic diagram of a hidden station according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of setting a NAV according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for receiving a wireless frame according to an embodiment of the present invention.
  • 4 is a schematic diagram of a receiving apparatus for a radio frame according to an embodiment of the present invention
  • Embodiment 1 According to an embodiment of the present invention, a method for receiving a radio frame is provided, and a receiving operation process flow of an STA having a PPDU that does not update the NAV function is provided, thereby implementing a method of abandoning receiving a PPDU and not updating the NAV. .
  • FIG. 3 is a flowchart of a method for receiving a radio frame according to an embodiment of the present invention. As shown in FIG. 3, the method may include the following steps (step S302-step S306).
  • Step S302 the first functional entity of the station detects that the channel signal strength reaches a predetermined threshold, and the first functional entity starts to receive the radio frame, and sends an indication that the channel detection result is busy to the second functional entity of the station.
  • Step S304 the first functional entity determines that the station is not the target receiving station of the radio frame, and sends a reception end indication of the radio frame to the second functional entity.
  • Step S306 when the radio frame transmission ends, the first functional entity sends an indication that the channel detection result is idle to the second functional entity.
  • the first functional entity of the station detects that the channel signal strength reaches a predetermined threshold, starts receiving the radio frame, and sends an indication that the channel detection result is busy to the second functional entity of the station.
  • the first functional entity determines that the station is not the target receiving station of the radio frame, it transmits an end of reception indication of the radio frame to the second functional entity. At the end of the radio frame transmission, the first functional entity sends an indication to the second functional entity that the channel detection result is idle.
  • a receiving operation processing flow for a station having a discarding radio frame without updating the NAV function is provided.
  • the first functional entity may determine that the station is not the target receiving station of the radio frame in the following situation: the first functional entity determines the identity information indicated by the physical layer header portion of the radio frame and The identity information of the site does not match, or the group identifier indicated by the header portion of the physical layer of the radio frame indicates that the target site of the radio frame is an access point or a mesh site, and the site is not an access point or a mesh site, then the site is determined not to be The destination of the wireless frame is the receiving site.
  • the first functional entity determines that the packet corresponding to the group identifier indicated by the physical layer header portion of the radio frame is not the packet where the station is located, or the number of spatio-temporal flows indicated in the packet when the station is in the foregoing packet indicates that the station is not included in the radio frame
  • the data determines that the site is not the target receiving site for the radio frame. For example, when the station detects that the channel becomes busy, the first functional entity generates a channel busy indication to the second functional entity, and starts reception of the radio frame header training sequence and the signaling domain, and successfully decodes the SU/MU VHT PPDU of the radio frame.
  • the PPDU is the SU VHT PPDU
  • the Partial AID indicated in the radio frame is different from the Partial AID of the station, or the Group ID indication in the frame is 0, that is, the target station indicating the radio frame is the access.
  • Point Or a Mesh site but the site is not an access point or a Mesh site, then the first functional entity determines that the site is not the target site of the radio frame.
  • the PPDU is a MU VHT PPDU
  • the station is not in the MU packet indicated by the Group ID in the radio frame, or the station is in the MU packet indicated by the Group ID in the radio frame, but the MU packet location corresponding to the site in the current MU PPDU is empty.
  • the first functional entity determines that the station is not the target station of the radio frame.
  • the first functional entity may send a reception end indication of the radio frame to the second functional entity of the station.
  • the receiving end indication may include, but is not limited to: a reason for receiving the end or status information of the end of the receiving.
  • the reason for the end of the reception or the status information of the end of the reception may be that the partial identifier or the group identification information indicated by the physical layer header portion of the radio frame does not match the identity information of the site (the partial identity or the group identifier does not match), or the site is Non-target receivers, or sites actively drop frames, etc.
  • the reason for the end of the reception or the status information of the end of the reception is used to indicate that the station is not the target receiving station of the radio frame, and may be expressed by different semantics, and is not limited to the foregoing expression manner in the embodiment of the present invention.
  • the first functional entity of the station shall generate a reception end indication primitive (PHY-RXE D.indication) in which the PPDU shall be discarded.
  • the reason or the selection indication is to the second functional entity.
  • the first functional entity determines that the station is not the target receiving station of the radio frame. And determining, according to the signaling indication information of the physical layer header of the radio frame, a time at which the radio frame transmission ends, and keeping the indication of the channel busy before the radio frame transmission ends. For example, the first functional entity may determine the time at which the radio frame transmission ends in the L-SIG of the SU/MU VHT PPDU of the radio frame.
  • the second function entity after receiving the reception end indication of the radio frame sent by the first function entity, determines, according to the reception end indication, that the current station is not the target receiving station of the radio frame, After receiving the channel detection result sent by the first functional entity as an idle indication, if channel competition access is required, the channel contention access is performed after waiting for a predetermined time, wherein the predetermined waiting time is not less than one interframe interval. Time, so that collisions between the listening site and other sites simultaneously sending wireless frames to the same site can be avoided.
  • the first functional entity may be configured to detect signal strength, transmit and receive radio frames on the wireless channel, interact with the second functional entity, and provide services for the second functional entity to implement physics.
  • a receiving device for a radio frame is provided, which is located at a first functional entity of the site, to implement the method provided by the foregoing embodiment of the present invention.
  • 4 is a schematic diagram of a receiving apparatus for a radio frame according to an embodiment of the present invention. As shown in FIG.
  • the apparatus mainly includes: a first sending module 402, a first determining module 404, a second sending module 406, and a third sending module. 408.
  • the first sending module 402 is configured to detect that the channel signal strength reaches a predetermined threshold, start receiving the radio frame, and send an indication that the channel detection result is busy to the second functional entity of the station; the first determining module 404, and the first sending The module 402 is coupled to determine that the station is not the target receiving station of the radio frame; the second sending module 406 is coupled to the first determining module 404, and is configured to be configured when the first determining module 404 determines that the station is not the target receiving station of the radio frame.
  • FIG. 5 is a schematic diagram of a preferred determining module according to an embodiment of the present invention.
  • the first determining module may include: a first determining unit 4042, configured to determine identity identification information indicated by a physical layer header portion of a radio frame. Does not match the identity information of the site, or the group identifier indicated by the header portion of the physical layer of the radio frame indicates that the target site of the radio frame is an access point or a mesh site, and the site is not an access point or a mesh site, then the site is determined. Not the destination receiving site for the radio frame.
  • the second determining unit 4044 is configured to determine that the packet corresponding to the group identifier indicated by the physical layer header portion of the radio frame is not the packet where the station is located, or the number of spatio-temporal flows indicated in the packet when the station is within the group indicated by the group identifier indicates the radio frame If the data of the site is not included, it is determined that the site is not the target receiving site of the wireless frame.
  • the receiving end indication sent by the second sending module 406 may include: a reason for receiving the end or status information of the end of the receiving, where the reason or status information of the end of the receiving may include: The identifier or group identifier does not match (the partial identifier or group identification information indicated by the physical layer header portion of the radio frame does not match the identity information of the site), or the site is a non-target receiver, or the site actively discards the frame.
  • the reason for the end of the reception or the status information of the end of the reception is set to the target receiving station that indicates that the station is not a radio frame, and may be expressed by different semantics, and is not limited to the foregoing expression manner in the embodiment of the present invention.
  • the first function entity may send an indication that the channel detection result is idle to the second function entity at the end of the radio frame transmission, at the end of the radio frame transmission.
  • the channel indication is busy before arrival.
  • the duration of the end of the radio frame transmission may be determined according to the signaling indication information of the physical layer header of the radio frame. Therefore, in a preferred embodiment of the embodiment of the present invention, as shown in FIG.
  • the apparatus may further include:
  • the determining module 410 is configured to, when the first determining module 404 determines that the station is not the target receiving station of the radio frame, determine, according to the signaling indication information of the physical layer frame header of the radio frame, the end of the radio frame transmission, and end the radio frame transmission. The indication of keeping the channel before is busy.
  • Embodiment 2 According to an embodiment of the present invention, a channel contention access method is provided, and the method may be used in conjunction with the foregoing radio frame receiving method.
  • FIG. 7 is a flowchart of a channel contention access method according to an embodiment of the present invention. As shown in FIG. 7, the method may include the following steps (step S702-step S706).
  • Step S702 the second functional entity of the station receives the reception end indication of the radio frame sent by the first functional entity of the station.
  • Step S704 the second function entity determines, according to the reception end indication, that the station is not the target receiving station of the radio frame.
  • Step S706 The second function entity receives an indication that the channel detection result sent by the first function entity is idle. If channel competition access is required, the channel competition access is performed after waiting for a predetermined time, where the predetermined time is not less than one. Interframe time.
  • the second functional entity of the station receives the reception end indication of the radio frame sent by the first functional entity of the station, and determines that the station is not the target receiving station of the radio frame according to the reception end indication; the second functional entity receives the first
  • the channel detection result sent by the functional entity is an idle indication, and when channel contention access is required, After waiting for no less than one interframe time, channel contention access is performed, thereby avoiding collisions caused by the neighboring station transmitting the radio frame to the same station simultaneously with other stations.
  • the receiving end indication of the radio frame sent by the first functional entity may include: a reason for receiving the end or status information of the end of the receiving. The station is not the target receiving station of the radio frame.
  • the reason or status information of the end of the receiving may include: part identifier or group identifier information indicated by the physical layer header portion of the radio frame
  • the identity information of the site does not match (partial identity or group identity does not match), or the site is a non-target receiver, or the site actively discards frames, and the like.
  • the reason for the end of the reception or the status information of the end of the reception is used to indicate that the station is not the target receiving station of the radio frame, and may be expressed by different semantics, and is not limited to the foregoing expression manner in the embodiment of the present invention.
  • the second functional entity may determine the waiting time for the station to contend for the wireless channel according to the reason for the end of the reception or the status information of the end of the acceptance.
  • the receiving end indication primitive (PHY-RXE D.indication) received by the second functional entity includes a parameter indicating whether the PPDU receives the correct parameter RXERROR, and the RXERROR is set to a value similar to PAIDorGIDnotMatch or notRecipient.
  • an interframe interval time may be an extended interframe interval time, where the extended interframe interval
  • the time is the sum of a short interframe space, a transmission time of a response frame, and an interframe space (ie, a normal interframe time) used in the case of receiving a correct frame.
  • the short interframe space is the site. Receiving the inter-frame interval between the transmitted response frame and the received radio frame when the target receiver is its own radio frame, and the radio frame needs to respond immediately; the normal interframe interval starts after receiving the correct frame.
  • the interframe space used when competing for a channel.
  • the transmission time of the response frame refers to the response frame transmission time calculated by using the lowest rate set supported by the station and the predefined response frame acknowledgement frame ACK.
  • the second functional entity receives a PHY with a RXERROR value other than NoError.
  • FIG. 8 is a schematic diagram showing the length of time of an extended interframe space according to an embodiment of the present invention.
  • the extended interframe space is EIFS under DCF
  • the extended interframe space is EIFS-DIFS+AIFS[AC] in EDCA mode.
  • the receiving end indication may further include: indication information of the response frame of the radio frame.
  • the indication information of the response frame may include: indication information of whether the radio frame needs to reply to the response frame, and type information of the response frame if the response frame needs to be returned.
  • the predetermined time may be the sum of a short interframe interval time, an interframe interval time used in the case of receiving the correct frame, and a transmission time of a response frame, and the response
  • the frame transmission time may be calculated according to the indicated response frame type and a preset rate; if the indication information of the response frame indicates that the radio frame does not need to reply to the response frame, the predetermined time may be used when a correct frame is received. Interframe time.
  • the second function entity receives the reception end indication of a similar value such as AIDorGIDnotMatch or notRecipient.
  • the reception end indication does not include the indication of the response frame of the current PPDU, the EIFS or EIFS-DIFS+AIFS[AC is used for the contention access. ];
  • the inter-frame interval is used aSIFSTime + xIFS + ACKTxTime, wherein aSIFSTime short interframe time interval predetermined protocol, xIFS to receive the correct protocol defined
  • ACKTxTime is the estimated response frame transmission time, and different response frame types may have different values.
  • FIG. 9 is a schematic diagram of an access device for channel contention according to an embodiment of the present invention.
  • the device mainly includes: a first receiving module 902, a determining module 904, a second receiving module 906, and an access module 908.
  • the first receiving module 902 is configured to receive a receiving end indication of the radio frame sent by the first functional entity of the station.
  • the determining module 904 is coupled to the first receiving module 902, and is configured to determine that the station is not wireless according to the receiving end indication. a target receiving station of the frame; the second receiving module 906 is configured to receive an indication that the channel detection result sent by the first functional entity is idle; the access module 908 is coupled to the second receiving module, and is configured to perform channel competition in need During access, the channel contention access is performed after waiting for a predetermined time, wherein the predetermined time is not less than one interframe time.
  • the first receiving module 902 of the second functional entity of the station receives the receiving end indication of the radio frame sent by the first functional entity of the station, and determines, by the determining module 904, that the station is not the target of the radio frame according to the receiving end indication.
  • the second receiving module 906 receives an indication that the channel detection result sent by the first functional entity is idle, and waits for not less than one interframe interval when the channel contention access is required, and is performed by the access module 908.
  • the channel competes for access, thereby avoiding collisions caused by the listening station transmitting other radio frames to the same station at the same time.
  • the receiving end indication received by the first receiving module 902 may include: a reason for receiving the end or status information of the end of the receiving, the reason for the end of the receiving or the end of the receiving
  • the status information may include: the partial identifier or group identification information indicated by the physical layer header portion of the radio frame does not match the identity information of the site (partial identity or group identifier does not match), or the site is a non-target recipient, or The site actively discards frames and the like.
  • an interframe interval time may be an extended interframe interval time, where the interframe interval time is extended. The sum of the short interframe time, one response frame transmission time, and one normal interframe time (i.e., the interframe time used in the case of receiving the correct frame).
  • channel competing access may be performed by the access module 908 after waiting for an extended interframe time interval.
  • the receiving end indication received by the first receiving module 902 may further include: indication information of the response frame of the radio frame, where the indication information of the response frame may include: indication information of whether the radio frame needs to reply to the response frame, and The type information of the response frame in the case where a response frame needs to be replied.
  • an interframe interval time may be a short interframe interval time and a case where the correct frame is received.
  • Embodiment 3 The embodiment of the present invention provides a method for a wireless station to discard the radio frame without updating its own NAV by detecting the physical frame header of the radio frame and determining that the local station is not the receiver of the current radio frame.
  • a method for receiving a radio frame is as follows.
  • the first functional entity When the station detects that the channel signal strength reaches the preset threshold, the first functional entity sends an indication that the channel detection result is busy to the second functional entity, and starts detecting the radio frame physical frame header sequence and the signaling indication information, when the site is not the When the target of the radio frame receives the station, the first functional entity of the station sends a reception end indication to the second function entity, and at the end of the radio frame transmission, the first function entity sends an indication that the channel detection result is idle to the second function entity. .
  • the receiving end indication may carry the reason or status information of the end of the receiving, and the reason or status information of the end of the receiving is that the partial identity group identifier does not match, the site non-target receiver or the site actively discards. frame.
  • the site When the site is not the target receiving site of the radio frame, it can choose to receive or discard the radio frame according to the site predefined operation.
  • the first functional entity may be configured to detect signal strength, transmit and receive wireless frames on the wireless channel, interact with the second functional entity, and provide services for the second functional entity.
  • the second functional entity can be used for control of the station accessing the wireless channel.
  • the radio frame transmission end time is obtained from the signaling indication information in the radio frame header.
  • the station keeps the radio channel indication busy.
  • the second function entity receives the radio frame reception end indication sent by the first function entity, and performs a channel contention access procedure when the channel status indication is idle, and the waiting time before the access channel is not less than the interframe time.
  • the interframe space is an extended interframe space
  • the extended interframe interval includes a short interframe space plus an acknowledgement frame transmission. Time plus a normal interframe space.
  • the reason or state of the reception end indication sent by the first functional entity is that the partial identity group identifier does not match, the site non-target receiver or the site actively discards the frame.
  • the fourth embodiment of the present invention describes the method provided by the embodiment of the present invention by taking the first functional entity in the physical layer and the second functional entity in the MAC layer as an example.
  • the transmitting station STA1 After the transmitting station STA1 obtains the transmission opportunity, it sends a SU VHT PPDU or a MU VHT PPDU, assuming
  • the STA2 is the receiving station, and STA3 is the listening station. That is, the SU/MU VHT PPDU sent by the above does not contain the data sent to STA3.
  • the STA1 sends the SU/MU VHT PPDU
  • the STA1 carries the indication information in the L-SIG part of the physical frame header, and the indication information can be used to obtain the transmission time of the PPDU.
  • the PPDU carries the Group ID and the Partial AID information in the physical frame header VHT-SIG-A. The information may indicate whether the PPDU is a SU PPDU or a MU PPDU, a partial identity of the target receiving station, and each MU user in the MU PPDU.
  • the number of space-time streams in the current MU PPDU The number of space-time streams in the current MU PPDU.
  • the physical layer When STA3 detects that the channel is busy, the physical layer generates a channel busy indication to the MAC layer, and starts receiving the radio frame header training sequence and the signaling domain, and successfully decodes the L-SIG and VHT of the SU/MU VHT PPDU sent by the STA1. After -SIG-A, it is found that it is not the target receiver, that is, in one of the following two situations, STA3 may choose not to receive or discard the PPDU.
  • the PPDU is a SU VHT PPDU.
  • the Partial AID indicated in the frame is different from the Partial AID of STA3, or the Group ID in the frame indicates 0, but STA3 is not an AP or a Mesh STA.
  • the PPDU is the MU VHT PPDU, the STA3 is not in the MU packet indicated by the Group ID in the frame, or the STA3 is in the MU packet indicated by the Group ID in the frame, but the STA3 corresponding to the current MU PPDU
  • the number of space-time streams indicated on the MU grouping position is 0. If STA3 chooses not to receive or discard the SU/MU VHT PPDU in the above case, the physical layer entity of STA3 shall generate a reception end indication primitive PHY-RXE D.indication, the reason or selection of the PPDU to be discarded in the primitive Indicated to the MAC layer, for example, the primitive contains a parameter indicating whether the PPDU receives the correct parameter RXERROR, and RXERROR should be set to a value similar to PAIDorGIDnotMatch or notRecipient, instead of NoError, and the physical layer should obtain the PPDU in the L-SIG.
  • PHY-RXE D.indication the reason or selection of the PPDU to be discarded in the primitive Indicated to the MAC layer
  • the primitive contains a parameter indicating whether the PPDU receives the correct parameter RXERROR, and RXERROR should be set to a value similar to PAID
  • the channel status indication is busy BUSY, and the channel detection status is indicated as idle at the end of the PPDU transmission.
  • the flow of the receiving method of the wireless frame is as shown in FIG.
  • the MAC layer competing access function DCF or EDCAF receives a PHY-RXEND.indication whose RXERROR value is not NoError.
  • the extended interframe space should be used for the competitive access procedure. As shown in Figure 8, the extended interframe space is EIFS under DCF and EIFS-DIFS+AIFS[AC] in EDCA mode.
  • the fifth embodiment of the present invention describes the method provided by the embodiment of the present invention by taking the first functional entity in the physical layer and the second functional entity in the MAC layer as an example.
  • STA1 After the transmitting station STA1 obtains the transmission opportunity, it sends a SU PPDU or a MU PPDU. It is assumed that STA2 is the receiving station and STA3 is the listening station. That is, the SU/MU PPDU sent by the above does not contain the data sent to STA3.
  • the STA1 carries the indication information in the physical frame header SIG signaling part when transmitting the foregoing SU/MU PPDU, and the transmission time of the PPDU can be obtained by using the indication information, and the PPDU is also learned by the SIG coding mode or information indication.
  • the SU PPDU is also a MU PPDU, and may also include group indication information (Group ID) and/or partial identity (Partial AID) information, which may indicate the PPDU, part of the identity of the target receiving station, and each MU for the MU PPDU.
  • Group ID group indication information
  • Partial AID partial identity
  • the number of free time streams of the user in the current MU PPDU It may also include information on the response frame of the PPDU, that is, whether there is a response frame, a type of response frame, and the like.
  • the physical layer When the STA3 detects that the channel is busy, the physical layer generates a channel busy indication to the MAC layer, and starts receiving the radio frame header training sequence and the signaling domain, and successfully decodes the signaling SIG of the SU/MU PPDU sent by the STA1, and finds that It is not the target receiver. STA3 may choose not to receive or discard the PPDU. If STA3 chooses not to receive or discard the SU/MU PPDU in the above case, the physical layer entity of STA3 shall generate a reception end indication primitive PHY-RXEND.indication, which shall discard the PPDU. Cause or selection indication to the MAC layer.
  • the primitive contains a parameter indicating whether the PPDU receives the correct parameter RXERROR, and RXERROR should be set to a value similar to PAIDorGIDnotMatch or notRecipient, instead of NoError, and the physical layer should be maintained during the PPDU transmission period obtained in the L-SIG.
  • the channel status indication is busy BUSY, and the channel detection status is indicated as idle at the end of the PPDU transmission.
  • the primitive may further include indication information of a response frame of the current PPDU.
  • the MAC layer contention access function DCF or EDCAF receives a PHY-RXE D. indication whose RXERROR value is not NoError but a similar value such as AIDorGIDnotMatch or notRecipient. If the primitive does not include the indication of the response frame of the current PPDU, then the contention is performed. EIFS or EIFS-DIFS+AIFS[AC] is used for the entry ; if the primitive includes the indication information of the response frame of the current PPDU, the interframe space used is aSIFSTime + xIFS+ ACKTxTime, where aSIFSTime is the short interframe space specified by the protocol.
  • xIFS is the normal interframe space used by the competing access entity after the correct frame is received by the protocol.
  • the ACKTxTime is the estimated response frame transmission time. Different response frame types can have different values.
  • the interframe space used may be xIFS, that is, excluding aSIFSTime and ACKTxTime.
  • the PHY-RXE D.indication indicates that the transmission opportunity of the current frame is not ended and there is subsequent frame transmission, the observing station has to wait for the transmission opportunity.
  • Channel access is indicated when the indication is end.
  • a station is further provided, which includes the receiving apparatus of the radio frame and the channel competing access apparatus provided by the foregoing embodiments of the present invention.
  • the receiving device of the radio frame and the channel competing access device may adopt the structures described in the foregoing embodiments, and have the features described in the foregoing embodiments, and details are not described herein. From the above description, it can be seen that the present invention achieves the following technical effects:
  • the first functional entity of the station detects that the channel signal strength reaches a predetermined threshold, starts receiving a radio frame, and sends a channel detection result to the second functional entity of the station.
  • An indication of being busy when the first functional entity determines that the station is not the target receiving station of the radio frame, transmits a reception end indication of the radio frame to the second functional entity.
  • the first functional entity sends an indication that the channel detection result is idle to the second functional entity, and provides a receiving operation processing flow of the station having the radio frame discarded without updating the NAV function.
  • the second functional entity of the station receives the reception end indication of the radio frame sent by the first functional entity of the station, and determines that the station is not the target receiving station of the radio frame according to the reception end indication; the second functional entity receives the channel detection sent by the first functional entity
  • the result is an idle indication, and after waiting for no less than one interframe time, the channel contention access is performed, thereby avoiding collision caused by the neighboring station transmitting the radio frame to the same station simultaneously with other stations.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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Abstract

本发明公开了一种无线帧的接收方法及装置。其中,该方法包括:站点的第一功能实体检测到信道信号强度到达预定门限,第一功能实体开始接收无线帧,并向站点的第二功能实体发送信道检测结果为忙的指示(S302);第一功能实体确定站点不是无线帧的目标接收站点,向第二功能实体发送无线帧的接收结束指示(S304);在无线帧传输结束时,第一功能实体向第二功能实体发送信道检测结果为闲的指示(S306)。通过本发明,提供了具有抛弃无线帧而不更新网络分配矢量(NAV)功能的站点的接收操作处理流程。

Description

无线帧的接收方法及装置 技术领域 本发明涉及通信领域, 具体而言, 涉及一种无线帧的接收方法及装置。 背景技术 目前,在无线网络领域,无线局域网(Wireless Local Area Network,简称为 WLAN) 快速发展, 对 WLAN覆盖的需求日益增长, 对吞吐量的要求亦越来越高。 电气和电子 工程师协会(Institute for Electrical and Electronic Engineers,简称为 IEEE) 802.11组中, 先后定义了 802.11a, 802.11b, 802.11g等一系列最普通的 WLAN技术标准。 随后又陆 续出现了其他任务组, 致力于发展涉及现有 802.11 技术改进的规范, 例如, 802.11η 任务组提出高吞吐量 (High throughput,简称为 HT)的要求,引入多输入多输出(Multiple Input Multiple Output, 简称为 MIMO)和波束赋形技术, 支持高达 600Mbps的数据速 率, 802.11ac任务组进一步提出甚高吞吐量 (Very High throughput, 简称为 VHT) 的 概念,通过引入更大的信道带宽、更高阶的 MIMO和多用户多输入多输出 (MU-MIMO) 等技术, 数据速率能够达到 lGbps以上。 另外, 刚成立不久的 802.11ah任务组, 其主 要任务就是对 WLAN的媒介接入控制层 (Media Access Control, 简称为 MAC) 和物 理层协议 (Physical Layer Protocol, 简称为 PHY) 进行修改和增强, 以便适应智能电 网 (Smart Grid )、 环境农业监测 ( Environmental/ Agricultural Monitoring )、 工业过程自 动化 (Industrial Process Automation) 等网络的需求。 在 WLAN中, 一个接入点 (Access Point, 简称为 AP) 以及与 AP相关联的多个 站点(Station, 简称为 STA)组成了一个基本服务集(Basic Service Set, 简称为 BSS)。 802.11定义了两种操作模式: 分布式协调功能 (Distributed Coordination Function, 简 称为 DCF) 和点协调功能 (Point Coordination Function, 简称为 PCF), 以及针对这两 种操作模式的改进:增强型分布式协调访问功能(Enhanced Distributed Channel Access, 简称为 EDCA) 和混合协调功能控制信道访问功能 (Hybrid Coordination Function Controlled Channel Access, 简称 HCCA)。 其中, DCF是最基本的操作模式, 利用带 有冲突避免的载波侦听多路访问机制 ( CSMA with Collision Avoidance, 简称为 CSMA/CA)使多个站点共享无线信道。 EDCA是增强型操作模式, 利用 CSMA/CA机 制,使多个不同优先级队列共享无线信道,并预约传输机会(Transmission Opportunity, 简称为 TXOP),这里不同的优先级队列称为接入等级(Access Category,简称为 AC)。 竞争接入机制中, 站点等待一个帧间间隔加上一个随机退避时间检测信道, 当信道在 上述等待时间内都为闲时, 站点才可以接入信道, 若站点在正确接收一个包后开始信 道竞争接入, 则上述等待的帧间间隔为普通帧间间隔, DCF 下普通帧间间隔为 DIFS (DCF interframe Space), EDCA下为 AIFS ( Arbitration Interframe Space), 若非正确 接收一个包后开始信道竞争接入, 则上述帧间间隔为扩展的帧间间隔, 等于一个正确 接收后使用的正常帧间间隔加上一个短帧间间隔再加上一个预定义的应答帧传输时 间, 其中, 短帧间间隔为目标接收方收到给自己的无线帧后, 需要立即应答而使用的 帧间间隔。 多个无线站点共享信道时, 无线环境的冲突检测变得非常困难, 其中一大问题就 是隐藏站点 (如图 1所示)。 在图 1的示例中, 站点 A向站点 B发送数据, 同时, 站 点 C也向站点 B发送数据, 由于 C和 A彼此都处于对方的覆盖范围之外, 站点 A和 站点 C同时发送将导致冲突, 造成站点 B不能正确接收数据。 从站点 A的角度来看, 站点 C即是一个隐藏站点。 为解决隐藏站点问题, 802.11提出了虚拟信道检测机制, 即通过在无线帧帧头中包含预约信道时间信息, 其他接收到含有时间预约信息的无线 帧的旁听站点设置本地存储的一个网络分配矢量 (Network Allocation Vector, 简称为 NAV), NAV 的取值设置为上述时间预约信息的最大值, 在该时间内, 旁听站点不会 发送数据, 从而避免了隐藏节点竞争信道造成碰撞。其他站点的 NAV减为零后, 才能 发送数据。 例如, 发送方发送请求发送帧 (Request To Send, 简称为 RTS ) 进行信道 预约, RTS包含信道预约时间信息, 接收方响应确认发送帧 (Clear To Send, 简称为 CTS ) 进行信道预约确认, CTS也包含信道预约时间信息, 以保证发送方能够完成后 续的数据帧交换。设置 NAV的示意如图 2所示,一般的数据帧交换过程包括发送方发 送数据帧, 目标接收方成功接收后回复应答帧, 图 2中 RTS/CTS预约的信道时间 NAV 可以包含多个帧交换过程的时间。 另外数据帧和应答帧中也可以包含信道预约时间信 息, 例如, 可以不使用 RTS/CTS预约的信道时间, 而直接发送数据帧, 在该数据帧和 其应答帧中携带信道预约时间, 数据帧的预约时间信息至少包含本次帧交换的应答帧 的传输时间, 还可以包含接下来的帧交换的时间。 在 WLAN中, 无线帧一般包含物理层帧头部分 (PHY Protocol Data Unit, 简称为 PPDU)和物理层负载部分 (PHY Service Data Unit, 简称为 PSDU), 在已经颁布的无 线局域网技术标准中,物理层帧头部分只包含解码 PSDU所需的训练序列和信令指示, 例如编码调制方式的指示等。 但在正在制定的无线局域网标准中, 物理层帧头部分加 入了接收方的部分标识信息,当 STA检测到一个 PPDU,且该帧的物理帧头指示此 STA 不可能是该帧的接收者时,该 STA可以放弃接收该 PPDU的物理层负载部分,而 NAV 的设置值在物理层负载部分, 则放弃接收 PPDU就不更新自己的 NAV。这样做的主要 目的是避免 STA解码与自己无关的数据包, 从而节省站点功率, 上述的接收方的部分 标识信息, 主要指部分关联标识信息 (Partial AID) 和分组标识信息 (Group ID)。 例 如, 在 WLAN新标准中, 下面两种情况下 STA可以放弃接收某个 PPDU且不更新自 己的 NAV:
( 1 ) PPDU为 SU PPDU, 其物理帧头中 Group ID和 Partial AID指示 STA不可能 为目标接收者, 即无线帧中指示的 Partial AID与 STA的 Partial AID不同, 或无线帧中
Group ID为 0, 但该 STA不是 AP, 也不是 Mesh STA。
(2) PPDU为 MU PPDU, STA不在帧中 Group ID指示的 MU分组里面, 或者 STA在帧中 Group ID指示的 MU分组里面但该 STA所在的 MU分组位置上指示的空 时流数为 0。 现有技术中, 虽然定义了 STA可以放弃接收 PPDU且不更新 NAV的情况, 但没 有给出具有抛弃 PPDU而不更新 NAV功能的 STA的接收操作处理流程,从而导致 STA 无法实现放弃接收 PPDU且不更新 NAV。并且, 现有技术中也没有考虑抛弃 PPDU后 可能出现的问题, 这可能会造成发送碰撞等问题。 例如, 如图 1所示情况, 站点 B向 站点 A发送无线帧, C为旁听站点, 由于站点 A和站点 C互为隐藏站点, 站点 C通 过检测物理帧头判断站点 B发送的 PPDU不含有自己的数据, 且站点 C选择丢弃该 PPDU且不更新 NAV。 当站点 B发送 PPDU结束后, 站点 A会在短帧间间隔 (SIFS)后 向站点 B回复应答帧, 而站点 C没有更新自己的 NAV且检测不到站点 B发送的应答 帧信号, 则会在站点 B发送结束后竞争信道, 站点 C若使用一般的竞争接入等待时间 接入信道, 而此时站点 A传输应答帧还没有结束, 则站点 A和站点 C仍同时发送, 站点 B无法正确收到应答帧。 发明内容 针对现有技术中由于没有给出具有抛弃 PPDU而不更新 NAV功能的 STA的接收 操作处理流程, 而导致的抛弃 PPDU而不更新 NAV功能无法实现或发送碰撞等问题, 本发明提供了一种无线帧的接收及信道竞争的接入方案, 以至少解决上述问题之一。 根据本发明的一个方面, 提供了一种无线帧的接收方法, 包括: 站点的第一功能 实体检测到信道信号强度到达预定门限, 所述第一功能实体开始接收无线帧, 并向所 述站点的第二功能实体发送信道检测结果为忙的指示; 所述第一功能实体确定所述站 点不是所述无线帧的目标接收站点,向所述第二功能实体发送无线帧的接收结束指示; 在所述无线帧传输结束时, 所述第一功能实体向所述第二功能实体发送信道检测结果 为闲的指示。 优选地,所述第一功能实体确定所述站点不是所述无线帧的目标接收站点,包括: 所述第一功能实体确定所述无线帧的物理层帧头部分指示的身份标识信息与所述站点 的身份标识信息不匹配, 或所述无线帧的物理层帧头部分指示的组标识指示所述无线 帧的目标站点为接入点或无线网格网络 Mesh站点,而所述站点不是接入点或 Mesh站 点, 则确定所述站点不是所述无线帧的目标接收站点; 或者, 所述第一功能实体确定 所述无线帧的物理层帧头部分指示的组标识对应的分组不是所述站点所在的分组, 或 所述站点在所述分组内时所述分组中指示的时空流数指示所述无线帧中不包含所述站 点的数据, 则确定所述站点不是所述无线帧的目标接收站点。 优选地, 所述接收结束指示包括: 接收结束的原因或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包括以下之一: 部分身份标识或组标识不 匹配, 或者站点为非目标接收方, 或站点主动丢弃帧。 优选地, 所述第一功能实体确定所述站点不是所述无线帧的目标接收站点时, 所 述方法还包括: 所述第一功能实体根据所述无线帧的物理层帧头的信令指示信息确定 所述无线帧传输结束的时刻, 并在所述无线帧传输结束之前保持信道的指示为忙。 优选地, 所述第一功能实体用于检测信号强度, 在无线信道上收发无线帧, 以及 为所述第二功能实体提供服务; 所述第二功能实体, 用于控制所述第一功能实体对无 线信道的接入, 接收并解码所述第一功能实体发送的数据单元, 发送数据单元给所述 第一功能实体并请求服务, 以及进行虚拟载波检测控制。 根据本发明的另一个方面, 提供了一种信道竞争的接入方法, 包括: 站点的第二 功能实体接收所述站点的第一功能实体发送的无线帧的接收结束指示; 所述第二功能 实体根据所述接收结束指示确定所述站点不是所述无线帧的目标接收站点; 所述第二 功能实体接收所述第一功能实体发送的信道检测结果为闲的指示, 若需要进行信道竞 争接入, 则在等待预定时间后进行信道竞争接入, 其中, 所述预定时间不小于一个帧 间间隔时间。 优选地, 所述接收结束指示包括: 接收结束的原因或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包括以下之一: 部分身份标识或组标识不 匹配, 或者站点为非目标接收方, 或站点主动丢弃帧。 优选地, 所述一个帧间间隔时间为一个扩展帧间间隔时间, 其中, 所述扩展帧间 间隔时间为一个短帧间间隔时间、 一个应答帧的传输时间和一个接收到正确帧的情况 下使用的帧间间隔时间三者之和。 优选地, 所述应答帧的传输时间为根据所述站点支持的速率集中最低的速率和预 定义的应答帧确认帧计算得出的时间。 优选地, 所述接收结束指示还包括: 所述无线帧的响应帧的指示信息, 其中, 所 述响应帧的指示信息包括: 所述无线帧是否需要回复响应帧的指示信息, 以及在需要 回复响应帧的情况下所述响应帧的类型信息。 优选地, 若所述响应帧的指示信息指示所述无线帧需要回复响应帧, 则所述一个 帧间间隔时间为一个短帧间间隔时间、 一个接收到正确帧的情况下使用的帧间间隔时 间、 及一个所述响应帧的传输时间三者之和; 若所述响应帧的指示信息指示所述无线 帧不需要回复响应帧, 则所述预定时间为一个接收到正确帧的情况下所使用的帧间间 隔时间。 优选地, 所述响应帧的传输时间为根据预定义的速率和所述响应帧的类型信息确 定的时间。 根据本发明的又一个方面, 提供了一种无线帧的接收装置, 位于站点的第一功能 实体, 包括: 第一发送模块, 设置为检测到信道信号强度到达预定门限, 开始接收无 线帧, 向所述站点的第二功能实体发送信道检测结果为忙的指示; 第一确定模块, 设 置为确定所述站点不是所述无线帧的目标接收站点; 第二发送模块, 设置为在所述第 一确定模块确定所述站点不是所述无线帧的目标接收站点时, 向所述第二功能实体发 送无线帧的接收结束指示; 第三发送模块, 设置为在所述无线帧传输结束时, 向所述 第二功能实体发送信道检测结果为闲的指示。 优选地, 所述第一确定模块包括: 第一确定单元, 设置为确定所述无线帧的物理 层帧头部分指示的身份标识信息与所述站点的身份标识信息不匹配, 或所述无线帧的 物理层帧头部分指示的组标识指示所述无线帧的目标站点为接入点或无线网格网络 Mesh站点, 而所述站点不是接入点或 Mesh站点, 则确定所述站点不是所述无线帧的 目标接收站点; 第二确定单元, 设置为确定所述无线帧的物理层帧头部分指示的组标 识对应的分组不是所述站点所在的分组, 或所述站点在所述分组内时所述分组中指示 的时空流数指示所述无线帧中不包含所述站点的数据, 则确定所述站点不是所述无线 帧的目标接收站点。 优选地, 所述接收结束指示包括: 接收结束的原因或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包括以下之一: 部分身份标识或组标识不 匹配, 或者站点为非目标接收方, 或站点主动丢弃帧。 优选地, 所述装置还包括: 第二确定模块, 设置为在所述第一确定模块确定所述 站点不是所述无线帧的目标接收站点时, 根据所述无线帧的物理层帧头的信令指示信 息确定所述无线帧传输结束的时刻, 并在所述无线帧传输结束之前保持信道的指示为 忙。 根据本发明的再一个方面, 提供了一种信道竞争的接入装置, 位于站点的第二功 能实体, 包括: 第一接收模块, 设置为接收所述站点的第一功能实体发送的无线帧的 接收结束指示; 确定模块, 设置为根据所述接收结束指示确定所述站点不是所述无线 帧的目标接收站点; 第二接收模块, 设置为接收所述第一功能实体发送的信道检测结 果为闲的指示; 接入模块, 设置为在需要进行信道竞争接入时, 在等待预定时间后进 行信道竞争接入, 其中, 所述预定时间不小于一个帧间间隔时间。 优选地, 所述接收结束指示包括: 接收结束的原因或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包括以下之一: 部分身份标识或组标识不 匹配, 或者站点为非目标接收方, 或站点主动丢弃帧。 优选地, 所述一个帧间间隔时间为一个扩展帧间间隔时间, 其中, 所述扩展帧间 间隔时间为一个短帧间间隔时间、 一个应答帧的传输时间和一个接收到正确帧的情况 下使用的帧间间隔时间三者之和。 优选地, 所述接收结束指示还包括: 所述无线帧的响应帧的指示信息, 其中, 所 述响应帧的指示信息包括: 所述无线帧是否需要回复响应帧的指示信息, 以及在需要 回复响应帧的情况下所述响应帧的类型信息。 优选地, 若所述响应帧的指示信息指示所述无线帧需要回复响应帧, 则所述一个 帧间间隔时间为一个短帧间间隔时间、 一个接收到正确帧的情况下使用的帧间间隔时 间、 及一个所述响应帧的传输时间三者之和; 若所述响应帧的指示信息指示所述无线 帧不需要回复响应帧, 则所述一个帧间间隔时间为一个接收到正确帧的情况下所使用 的帧间间隔时间。 根据本发明的再一个方面, 提供了一种站点, 包括: 无线帧的接收装置和信道竞 争的接入装置, 其中, 所述无线帧的接收装置, 包括: 第一发送模块, 设置为检测到 信道信号强度到达预定门限, 开始接收无线帧, 向所述信道竞争的接入装置发送信道 检测结果为忙的指示; 第一确定模块, 设置为确定所述站点不是所述无线帧的目标接 收站点; 第二发送模块, 设置为在所述第一确定模块确定所述站点不是所述无线帧的 目标接收站点时, 向所述信道竞争的接入装置发送无线帧的接收结束指示; 第三发送 模块, 设置为在所述无线帧传输结束时, 向所述信道竞争的接入装置发送信道检测结 果为闲的指示; 所述信道竞争的接入装置, 包括: 第一接收模块, 设置为接收所述无 线帧的接收装置发送的无线帧的接收结束指示; 确定模块, 设置为根据所述接收结束 指示确定所述站点不是所述无线帧的目标接收站点; 第二接收模块, 设置为接收所述 无线帧的接收装置发送的信道检测结果为闲的指示; 接入模块, 设置为在需要进行信 道竞争接入时, 等待预定时间后进行信道竞争接入, 其中, 所述预定时间不小于一个 帧间间隔时间。 优选地, 所述第一确定模块包括: 第一确定单元, 设置为确定所述无线帧的物理 层帧头部分指示的身份标识信息与所述站点的身份标识信息不匹配, 或所述无线帧的 物理层帧头部分指示的组标识指示所述无线帧的目标站点为接入点或无线网格网络 Mesh站点, 而所述站点不是接入点或 Mesh站点, 则确定所述站点不是所述无线帧的 目标接收站点; 第二确定单元, 设置为确定所述无线帧的物理层帧头部分指示的组标 识对应的分组不是所述站点所在的分组, 或所述站点在所述分组内时所述分组中指示 的时空流数指示所述无线帧中不包含所述站点的数据, 则确定所述站点不是所述无线 帧的目标接收站点。 优选地, 所述无线帧的接收装置还包括: 第二确定模块, 设置为在所述第一确定 模块确定所述站点不是所述无线帧的目标接收站点时, 根据所述无线帧的物理层帧头 的信令指示信息确定所述无线帧传输结束的时刻, 并在所述无线帧传输结束之前保持 信道的指示为忙。 优选地, 所述接收结束指示包括: 接收结束的原因或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包括以下之一: 部分身份标识或组标识不 匹配, 或者站点为非目标接收方, 或站点主动丢弃帧。 优选地, 所述一个帧间间隔时间为一个扩展帧间间隔时间, 其中, 所述扩展帧间 间隔时间为一个短帧间间隔时间、 一个应答帧的传输时间和一个接收到正确帧的情况 下使用的帧间间隔时间三者之和。 优选地, 所述接收结束指示还包括: 所述无线帧的响应帧的指示信息, 其中, 所 述响应帧的指示信息包括: 所述无线帧是否需要回复响应帧的指示信息, 以及在需要 回复响应帧的情况下所述响应帧的类型信息。 优选地, 若所述响应帧的指示信息指示所述无线帧需要回复响应帧, 则所述一个 帧间间隔时间为一个短帧间间隔时间、 一个接收到正确帧的情况下使用的帧间间隔时 间、 及一个所述响应帧的传输时间三者之和; 若所述响应帧的指示信息指示所述无线 帧不包含响应帧, 则所述一个帧间间隔时间为一个接收到正确帧的情况下所使用的帧 间间隔时间。 通过本发明, 站点的第一功能实体检测到信道信号强度到达预定门限, 开始接收 无线帧, 并向站点的第二功能实体发送信道检测结果为忙的指示; 第一功能实体确定 站点不是无线帧的目标接收站点时, 向第二功能实体发送无线帧的接收结束指示; 在 无线帧传输结束时, 第一功能实体向第二功能实体发送信道检测结果为闲的指示, 提 供了具有抛弃无线帧而不更新 NAV功能的站点的接收操作处理流程。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部分, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是根据本发明实施例的隐藏站点的示意图; 图 2是根据本发明实施例的设置 NAV的示意图; 图 3是根据本发明实施例的无线帧的接收方法的流程图; 图 4是根据本发明实施例的无线帧的接收装置的示意图; 图 5是根据本发明实施例优选的确定模块的示意图; 图 6是根据本发明实施例优选的无线帧的接收装置的示意图; 图 7是根据本发明实施例的信道竞争的接入方法的流程图; 图 8是根据本发明实施例的扩展帧间间隔的时间长度示意图; 图 9是根据本发明实施例的信道竞争的接入装置的示意图; 以及 图 10是根据本发明实施例的无线帧的接收方法的示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在不冲突的 情况下, 本申请中的实施例及实施例中的特征可以相互组合。 实施例一 根据本发明实施例, 提供了一种无线帧的接收方法, 给出了具有抛弃 PPDU而不 更新 NAV功能的 STA的接收操作处理流程,从而实现了放弃接收 PPDU且不更新 NAV 的方法。 图 3是根据本发明实施例的无线帧的接收方法的流程图, 如图 3所示, 该方法可 以包括以下几个步骤 (步骤 S302-步骤 S306)。 步骤 S302, 站点的第一功能实体检测到信道信号强度到达预定门限, 第一功能实 体开始接收无线帧, 并向站点的第二功能实体发送信道检测结果为忙的指示。 步骤 S304, 第一功能实体确定站点不是无线帧的目标接收站点, 向第二功能实体 发送无线帧的接收结束指示。 步骤 S306, 在无线帧传输结束时, 第一功能实体向第二功能实体发送信道检测结 果为闲的指示。 通过本发明实施例, 站点的第一功能实体检测到信道信号强度到达预定门限, 开 始接收无线帧, 并向站点的第二功能实体发送信道检测结果为忙的指示。 第一功能实 体确定站点不是无线帧的目标接收站点时, 向第二功能实体发送无线帧的接收结束指 示。 在无线帧传输结束时, 第一功能实体向第二功能实体发送信道检测结果为闲的指 示。 提供了具有抛弃无线帧而不更新 NAV功能的站点的接收操作处理流程。 在本发明实施例的一个优选实施方式中, 第一功能实体可以在以下情况时确定站 点不是无线帧的目标接收站点: 第一功能实体确定无线帧的物理层帧头部分指示的身 份标识信息与站点的身份标识信息不匹配, 或无线帧的物理层帧头部分指示的组标识 指示无线帧的目标站点为接入点或 Mesh站点, 而该站点不是接入点或 Mesh站点,则 确定站点不是无线帧的目标接收站点。 或者, 第一功能实体确定无线帧的物理层帧头 部分指示的组标识对应的分组不是站点所在的分组, 或站点在上述分组内时分组中指 示的时空流数指示无线帧中不包含该站点的数据, 则确定站点不是无线帧的目标接收 站点。 例如, 当站点检测到信道变忙, 则第一功能实体产生信道忙指示给第二功能实体, 并开始无线帧头训练序列和信令域的接收, 成功解码无线帧的 SU/MU VHT PPDU的 L-SIG和 VHT-SIG-A后, PPDU为 SU VHT PPDU, 无线帧中指示的 Partial AID与站 点的 Partial AID不同, 或帧中 Group ID指示为 0, 即指示无线帧的目标站点为接入点 或 Mesh站点, 但该站点不是接入点, 也不是 Mesh站点, 则第一功能实体确定站点不 是无线帧的目标站点。 或者, PPDU为 MU VHT PPDU, 站点不在无线帧中 Group ID 指示的 MU分组内, 或者站点在无线帧中 Group ID指示的 MU分组内, 但当前 MU PPDU中站点对应的 MU分组位置上指示的空时流数为 0, 即指示无线帧中不包含该 站点的数据, 则第一功能实体确定站点不是无线帧的目标站点。 在第一功能实体确定站点不是无线帧的目标接收站点时, 第一功能实体可以向站 点的第二功能实体发送无线帧的接收结束指示。 在本发明实施例的一个优选实施方式 中, 接收结束指示可以包括但不限于: 接收结束的原因或接收结束的状态信息。 接收 结束的原因或接收结束的状态信息可以是无线帧的物理层帧头部分指示的部分标识或 组标识信息与站点的身份标识信息不匹配(部分身份标识或组标识不匹配), 或者站点 为非目标接收方, 或站点主动丢弃帧等。 在本发明实施例中, 接收结束的原因或接收 结束的状态信息用于指示站点不是无线帧的目标接收站点,可以通过不同的语意表达, 不限于本发明实施例中的上述表达方式。 例如, 如果站点选择不接收或丢弃无线帧的 SU/MU PPDU, 则站点的第一功能实 体应产生一个接收结束指示原语(PHY- RXE D.indication), 该原语中应将丢弃 PPDU 的原因或选择指示给第二功能实体, 例如, 该原语中可以包含指示 PPDU是否接收正 确的参数 RXERROR, 且 RXERROR 可以设置为部分关联标识或组标识不匹配 (PAIDorGIDnotMatch), 或者站点不是目标接收方 (notRecipient) 等类似的值。 第一功能实体向第二功能实体发送无线帧的接收结束指示后, 在无线帧传输结束 时, 第一功能实体可以向第二功能实体发送信道检测结果为闲的指示。 无线帧传输结 束的时长可以根据无线帧的物理层帧头的信令指示信息确定, 因此, 在本发明实施例 的一个优选实施方式中, 第一功能实体确定站点不是无线帧的目标接收站点时, 还可 以根据所述无线帧的物理层帧头的信令指示信息确定无线帧传输结束的时刻, 并在无 线帧传输结束之前保持信道的指示为忙。例如, 第一功能实体可以在无线帧的 SU/MU VHT PPDU的 L-SIG中确定无线帧传输结束的时刻。 在上述实施例中, 第二功能实体在接收到第一功能实体发送的无线帧的接收结束 指示后, 根据该接收结束指示, 判断出当前站点不是该无线帧的目标接收站点的情况 下, 在接收到第一功能实体发磅的信道检测结果为闲的指示后, 若需要进行信道竞争 接入, 则在等待预定时间后进行信道竞争接入, 其中, 等待的预定时间不小于一个帧 间间隔时间, 从而可以避免旁听站点与其他站点同时向同一站点发送无线帧而造成的 碰撞。 在本发明实施例的一个优选实施方式中, 第一功能实体可以用于检测信号强度, 在无线信道上收发无线帧, 与第二功能实体交互以及为所述第二功能实体提供服务, 实现物理层的功能; 第二功能实体, 用于控制所述第一功能实体对无线信道的接入, 接收并解码第一功能实体发送的数据单元,发送数据单元给第一功能实体并请求服务, 以及进行虚拟载波检测控制, 实现媒体接入控制层的功能。 在实际应用中, 第一功能 实体相当于站点的物理层, 第二功能实体相当于站点的媒体接入控制层。 根据本发明实施例,还提供了一种无线帧的接收装置,位于站点的第一功能实体, 用以实现本发明上述实施例提供的方法。 图 4是根据本发明实施例的无线帧的接收装置的示意图, 如图 4所示, 该装置主 要包括: 第一发送模块 402、 第一确定模块 404、 第二发送模块 406和第三发送模块 408。 其中, 第一发送模块 402, 设置为检测到信道信号强度到达预定门限, 开始接收 无线帧, 向站点的第二功能实体发送信道检测结果为忙的指示; 第一确定模块 404, 与第一发送模块 402相耦合, 设置为确定站点不是无线帧的目标接收站点; 第二发送 模块 406, 与第一确定模块 404相耦合, 设置为在第一确定模块 404确定站点不是无 线帧的目标接收站点时, 向第二功能实体发送无线帧的接收结束指示; 第三发送模块 408, 与第二发送模块 406相耦合, 设置为在无线帧传输结束时, 向第二功能实体发送 信道检测结果为闲的指示。 通过本发明实施例, 第一发送模块 402检测到信道信号强度到达预定门限, 开始 接收无线帧, 并向站点的第二功能实体发送信道检测结果为忙的指示。 第一确定模块 404确定站点不是无线帧的目标接收站点时, 由第二发送模块 406向第二功能实体发 送无线帧的接收结束指示。 在无线帧传输结束时, 第三发送模块 408向第二功能实体 发送信道检测结果为闲的指示。提供了具有抛弃无线帧而不更新 NAV功能的站点的接 收操作处理流程。 图 5是根据本发明实施例优选的确定模块的示意图, 如图 5所示, 第一确定模块 可以包括: 第一确定单元 4042, 设置为确定无线帧的物理层帧头部分指示的身份标识 信息与站点的身份标识信息不匹配, 或无线帧的物理层帧头部分指示的组标识指示无 线帧的目标站点为接入点或 Mesh站点, 而该站点不是接入点或 Mesh站点,则确定站 点不是无线帧的目标接收站点。 第二确定单元 4044, 设置为确定无线帧的物理层帧头 部分指示的组标识对应的分组不是站点所在的分组, 或站点在组标识指示的分组内时 分组中指示的时空流数指示无线帧中不包含该站点的数据, 则确定站点不是无线帧的 目标接收站点。 在本发明实施例的一个优选实施方式中, 第二发送模块 406发送的接收结束指示 可以包括: 接收结束的原因或接收结束的状态信息, 其中, 接收结束的原因或状态信 息可以包括: 部分身份标识或组标识不匹配 (无线帧的物理层帧头部分指示的部分标 识或组标识信息与站点的身份标识信息不匹配), 或者站点为非目标接收方, 或站点主 动丢弃帧等。 在本发明实施例中, 接收结束的原因或接收结束的状态信息设置为指示 站点不是无线帧的目标接收站点, 可以通过不同的语意表达, 不限于本发明实施例中 的上述表达方式。 第一功能实体向第二功能实体发送无线帧的接收结束指示后, 在无线帧传输结束 时, 第一功能实体可以向第二功能实体发送信道检测结果为闲的指示, 在无线帧传输 结束时刻到来前持信道指示为忙。 无线帧传输结束的时长可以根据无线帧的物理层帧 头的信令指示信息确定, 因此, 在本发明实施例的一个优选实施方式中, 如图 6所示, 该装置还可以包括: 第二确定模块 410, 设置为在第一确定模块 404确定站点不是无 线帧的目标接收站点时, 根据无线帧的物理层帧头的信令指示信息确定无线帧传输结 束的时刻, 并在无线帧传输结束之前保持信道的指示为忙。 实施例二 根据本发明实施例, 提供了一种信道竞争的接入方法, 该方法可以与上述的无线 帧的接收方法配合使用。 图 7是根据本发明实施例的信道竞争的接入方法的流程图, 如图 7所示, 该方法 可以包括以下几个步骤 (步骤 S702-步骤 S706)。 步骤 S702,站点的第二功能实体接收站点的第一功能实体发送的无线帧的接收结 束指示。 步骤 S704, 第二功能实体根据接收结束指示确定站点不是无线帧的目标接收站 点。 步骤 S706, 第二功能实体接收第一功能实体发送的信道检测结果为闲的指示, 若 需要进行信道竞争接入, 则在等待预定时间后进行信道竞争接入, 其中, 该预定时间 不小于一个帧间间隔时间。 通过本发明实施例, 站点的第二功能实体接收站点的第一功能实体发送的无线帧 的接收结束指示, 并根据接收结束指示确定站点不是无线帧的目标接收站点; 第二功 能实体接收第一功能实体发送的信道检测结果为闲的指示,需要进行信道竞争接入时, 在等待不小于一个帧间间隔时间后, 进行信道竞争接入, 从而避免了旁听站点与其他 站点同时向同一站点发送无线帧而造成的碰撞。 在本发明实施例的一个优选实施方式中, 第一功能实体发送的无线帧的接收结束 指示可以包括: 接收结束的原因或接收结束的状态信息。 站点不是无线帧的目标接收 站点, 若第一功能实体预定义操作为丢弃上述无线帧时, 接收结束的原因或状态信息 可以包括: 无线帧的物理层帧头部分指示的部分标识或组标识信息与所述站点的身份 标识信息不匹配(部分身份标识或组标识不匹配), 或者站点为非目标接收方, 或站点 主动丢弃帧等。 在本发明实施例中, 接收结束的原因或接收结束的状态信息用于指示 站点不是无线帧的目标接收站点, 可以通过不同的语意表达, 不限于本发明实施例中 的上述表达方式。 第二功能实体可以根据接收结束的原因或接受结束的状态信息确定站点竞争无线 信道的等待时间。 例如, 第二功能实体接收到的接收结束指示原语 (PHY-RXE D.indication) 中包含指示 PPDU 是否接收正确的参数 RXERROR, 且 RXERROR设置为 PAIDorGIDnotMatch或者 notRecipient等类似的值。 在信道检测状 态指示变为闲时, 在信道状态为闲且需要进行信道竞争接入时, 等待一个与该接收结 束的原因对应的时间后进行竞争接入。 在本发明实施例的另一个优选实施方式中, 在接收结束的原因或接受结束的状态 信息不是接收无错误时, 一个帧间间隔时间可以为一个扩展帧间间隔时间, 其中, 扩 展帧间间隔时间为一个短帧间间隔时间、 一个应答帧的传输时间和一个接收到正确帧 的情况下使用的帧间间隔时间 (即普通帧间间隔时间) 三者之和, 上述短帧间间隔为 站点收到目标接收方是自己的无线帧, 且该无线帧需要立即应答时, 发送的应答帧与 接收到的无线帧之间的帧间间隔; 上述普通帧间间隔为接收到正确帧后, 开始竞争信 道时使用的帧间间隔。 优选地, 上述应答帧的传输时间指使用站点支持的速率集中最 低的速率和预定义的应答帧确认帧 ACK计算得出的应答帧传输时间。 例如, 第二功能实体接收到一个 RXERROR 值不是 NoError 的 PHY-
RXEND.indication后, 在信道检测状态指示变为闲时, 使用扩展帧间间隔进行竞争接 入。图 8是根据本发明实施例的扩展帧间间隔的时间长度示意图。如图 8所示,在 DCF 下扩展帧间间隔为 EIFS, 在 EDCA方式下扩展帧间间隔为 EIFS-DIFS+AIFS[AC]。 进一步的, 接收结束指示还可以包括: 无线帧的响应帧的指示信息。 其中, 响应 帧的指示信息可以包括: 无线帧是否需要回复响应帧的指示信息, 以及在需要回复响 应帧的情况下响应帧的类型信息。 在本发明实施例的一个优选实施方式中, 若响应帧 的指示信息指示无线帧包含响应帧, 则预定时间可以为一个短帧间间隔时间、 一个接 收到正确帧的情况下使用的帧间间隔时间、 及一个响应帧的传输时间三者之和, 响应 帧传输时间可以根据指示的响应帧类型和预设的速率计算得出; 若响应帧的指示信息 指示无线帧不需要回复响应帧, 则预定时间可以为一个接收到正确帧的情况下所使用 的帧间间隔时间。 例如,第二功能实体接收 AIDorGIDnotMatch或者 notRecipient等类似的值的接收 结束指示, 若接收结束指示中不包括当前 PPDU的响应帧的指示, 则进行竞争接入时 使用 EIFS或 EIFS-DIFS+AIFS[AC]; 若接收结束指示中包含包括当前 PPDU的响应帧 的指示信息, 则使用的帧间间隔为 aSIFSTime + xIFS+ ACKTxTime, 其中 aSIFSTime 为协议规定的短帧间间隔时间, xIFS为协议定义的接收到正确帧后, 竞争接入实体使 用的正常帧间间隔, ACKTxTime为估计的应答帧传输时间,不同的应答帧类型可以有 不同的值, 当指示当前 PPDU没有无线帧时, 使用的帧间间隔可以是 xIFS, 即不包括 aSIFSTime和 ACKTxTime。 根据本发明实施例, 还提供了一种信道竞争的接入装置, 位于站点的第二功能实 体, 用以实现本发明上述实施例提供的信道竞争的接入方法。 图 9是根据本发明实施例的信道竞争的接入装置的示意图, 如图 9所示, 该装置 主要包括: 第一接收模块 902、 确定模块 904、 第二接收模块 906和接入模块 908。 其 中, 第一接收模块 902, 设置为接收站点的第一功能实体发送的无线帧的接收结束指 示; 确定模块 904, 与第一接收模块 902相耦合, 设置为根据上述接收结束指示确定 站点不是无线帧的目标接收站点; 第二接收模块 906, 设置为接收第一功能实体发送 的信道检测结果为闲的指示; 接入模块 908, 与第二接收模块相耦合, 设置为在在需 要进行信道竞争接入时, 等待预定时间后进行信道竞争接入, 其中, 该预定时间不小 于一个帧间间隔时间。 通过本发明实施例, 站点的第二功能实体的第一接收模块 902接收站点的第一功 能实体发送的无线帧的接收结束指示, 并由确定模块 904根据接收结束指示确定站点 不是无线帧的目标接收站点; 第二接收模块 906接收第一功能实体发送的信道检测结 果为闲的指示, 在在需要进行信道竞争接入时, 等待不小于一个帧间间隔的时间后, 由接入模块 908进行信道竞争接入, 从而避免了旁听站点与其他站点同时向同一站点 发送无线帧而造成的碰撞。 在本发明实施例的一个优选实施方式中, 第一接收模块 902接收到的接收结束指 示可以包括: 接收结束的原因或接收结束的状态信息, 该接收结束的原因或接收结束 的状态信息可以包括: 无线帧的物理层帧头部分指示的部分标识或组标识信息与站点 的身份标识信息不匹配 (部分身份标识或组标识不匹配), 或者站点为非目标接收方, 或站点主动丢弃帧等。 在本发明实施例中, 接收结束的原因或接收结束的状态信息设 置为指示站点不是无线帧的目标接收站点, 可以通过不同的语意表达, 不限于本发明 实施例中的上述表达方式。 在本发明实施例的另一个优选实施方式中, 在接收结束的原因或接受结束的状态 信息不是接收错误时, 一个帧间间隔时间可以为一个扩展帧间间隔时间, 其中, 扩展 帧间间隔时间为一个短帧间间隔时间、 一个应答帧传输时间和一个普通帧间间隔时间 (即一个接收到正确帧的情况下使用的帧间间隔时间) 三者之和。 此时, 在等在一个 扩展帧间间隔时间后, 可以由接入模块 908进行信道竞争接入。 进一步的, 第一接收模块 902接收到的接收结束指示还可以包括: 无线帧的响应 帧的指示信息, 其中, 响应帧的指示信息可以包括: 无线帧是否需要回复响应帧的指 示信息, 以及在需要回复响应帧的情况下响应帧的类型信息。 在本发明实施例的一个 优选实施方式中, 若响应帧的指示信息指示无线帧需要回复响应帧, 则一个帧间间隔 时间可以为一个短帧间间隔时间、 一个接收到正确帧的情况下使用的帧间间隔时间、 及一个响应帧的传输时间三者之和; 若响应帧的指示信息指示无线帧不需要回复响应 帧, 则一个帧间间隔时间可以为一个接收到正确帧的情况下所使用的帧间间隔时间。 实施例三 本发明实施例针对无线站点通过检测无线帧物理帧头, 判断出本站点不是当前无 线帧的接收者时,无线站点可以丢弃该无线帧且不更新自己的 NAV的情况,提供了一 种无线帧的接收方法, 具体方法如下。 站点检测到信道信号强度到达预设门限时, 第一功能实体向第二功能实体发送信 道检测结果为忙的指示, 并开始检测无线帧物理帧头序列及信令指示信息, 当该站点 不是该无线帧的目标接收站点时, 则站点的第一功能实体发送一个接收结束指示给第 二功能实体, 在无线帧传输结束时刻, 第一功能实体向第二功能实体发送信道检测结 果为闲的指示。 在本发明实施例的一个优选实施方式中, 接收结束指示可以携带接收结束的原因 或状态信息, 接收结束的原因或状态信息为部分身份标识组标识不匹配、 站点非目标 接收方或站点主动丢弃帧。 站点不是无线帧的目标接收站点时, 可以根据站点预定义 操作, 选择接收或丢弃无线帧。 上述第一功能实体, 可以用于检测信号强度, 在无线信道上收发无线帧, 与第二 功能实体交互以及为第二功能实体提供服务。 第二功能实体, 可以用于站点接入无线 信道的控制。 从上述无线帧传输结束时刻由上述无线帧帧头中的信令指示信息中获取, 上述无 线帧的传输时间内, 站点保持无线信道指示为忙。 第二功能实体接收到第一功能实体发送的无线帧接收结束指示, 且在信道状态指 示为闲时,进行信道竞争接入过程,接入信道接前等待的时间不小于帧间间隔的时间。 当上述第一功能实体发送的无线帧接收结束指示的原因或状态不是无错误, 上述 帧间间隔的时间为一个扩展帧间间隔, 扩展帧间间隔包括一个短帧间间隔加上一个应 答帧传输时间加上一个普通帧间间隔。 上述第一功能实体发送的接收结束指示的原因 或状态是部分身份标识组标识不匹配、 站点非目标接收方或站点主动丢弃帧。 实施例四 本发明实施例以第一功能实***于物理层, 第二功能实***于 MAC层为例, 对 本发明实施例提供的方法进行描述。 发送站点 STA1获取传输机会后, 发送 SU VHT PPDU或 MU VHT PPDU, 假设
STA2是接收站点, STA3为旁听站点, 即上述发送的 SU/MU VHT PPDU中不含有发 送给 STA3的数据。 STA1在发送上述 SU/MU VHT PPDU时会在物理帧头 L-SIG部分 携带指示信息, 通过该指示信息可以得出该 PPDU的传输时间。 且上述 PPDU在物理 帧头 VHT-SIG-A中携带 Group ID和 Partial AID信息,该信息可以指示该 PPDU是 SU PPDU还是 MU PPDU, 目标接收站点的部分身份标识,及为 MU PPDU时各个 MU用 户在当前 MU PPDU的空时流数。 当 STA3检测到信道变忙,则物理层产生信道忙指示给 MAC层,并开始无线帧头 训练序列和信令域的接收, 成功解码上述 STA1发送的 SU/MU VHT PPDU的 L-SIG 和 VHT-SIG-A后, 发现自己不是目标接收方, 即是下面两种情况之一时, STA3可以 选择不接收或丢弃该 PPDU。
( 1 ) PPDU为 SU VHT PPDU, 帧中指示的 Partial AID与 STA3的 Partial AID不 同, 或帧中 Group ID指示为 0, 但 STA3不是 AP, 也不是 Mesh STA。 (2) PPDU为 MU VHT PPDU, STA3不在帧中 Group ID指示的 MU分组里面, 或者 STA3在帧中 Group ID指示的 MU分组里面, 但当前 MU PPDU中 STA3对应的
MU分组位置上指示的空时流数为 0。 如果 STA3选择不接收或丢弃上述情况下的 SU/MU VHT PPDU, 则 STA3的物理 层实体应产生一个接收结束指示原语 PHY- RXE D.indication, 该原语中应将丢弃 PPDU的原因或选择指示给 MAC层, 例如, 该原语中包含指示 PPDU是否接收正确 的参数 RXERROR, 且 RXERROR应设置为 PAIDorGIDnotMatch或者 notRecipient等 类似的值, 而不是 NoError, 且物理层应在 L-SIG中得到的 PPDU传输期内, 保持信 道状况指示为忙 BUSY, 并在 PPDU传输结束时刻将信道检测状态指示为闲。 无线帧 的接收方法流程, 如图 10所示。 而 MAC层竞争接入功能 DCF或 EDCAF收到一个 RXERROR值不是 NoError的 PHY- RXEND.indication后, 在信道检测状态指示变为闲时, 应使用扩展帧间间隔进行 竞争接入过程。 如图 8所示, 在 DCF下扩展帧间间隔为 EIFS, 在 EDCA方式下扩展 帧间间隔为 EIFS-DIFS+AIFS[AC]。
实施例五 本发明实施例以第一功能实***于物理层, 第二功能实***于 MAC层为例, 对 本发明实施例提供的方法进行描述。 发送站点 STA1获取传输机会后, 发送 SU PPDU或 MU PPDU, 假设 STA2是接 收站点, STA3为旁听站点, 即上述发送的 SU/MU PPDU中不含有发送给 STA3的数 据。 STA1在发送上述 SU/MU PPDU时会在物理帧头 SIG信令部分携带指示信息, 通 过该指示信息可以得出该 PPDU的传输时间, 还可以通过 SIG的编码方式或信息指示 得知该 PPDU是 SU PPDU还是 MU PPDU, 还可能包含分组指示信息 (Group ID) 和 /或部分身份标识 (Partial AID) 信息, 该信息可以指示该 PPDU, 目标接收站点的部 分身份标识, 及为 MU PPDU时各个 MU用户在当前 MU PPDU的空时流数。 另外还 可能包括该 PPDU的响应帧的信息, 即有没有响应帧, 响应帧的类型等。 当 STA3检测到信道变忙,则物理层产生信道忙指示给 MAC层,并开始无线帧头 训练序列和信令域的接收, 成功解码上述 STA1发送的 SU/MU PPDU的信令 SIG后, 发现自己不是目标接收方, STA3可以选择不接收或丢弃该 PPDU。 如果 STA3选择不接收或丢弃上述情况下的 SU/MU PPDU, 则 STA3的物理层实 体应产生一个接收结束指示原语 PHY- RXEND.indication,该原语中应将丢弃 PPDU的 原因或选择指示给 MAC 层。 例如, 该原语中包含指示 PPDU是否接收正确的参数 RXERROR, 且 RXERROR应设置为 PAIDorGIDnotMatch或者 notRecipient等类似的 值, 而不是 NoError, 且物理层应在 L-SIG中得到的 PPDU传输期内, 保持信道状况 指示为忙 BUSY, 并在 PPDU传输结束时刻将信道检测状态指示为闲。 另外该原语还 可以包括当前 PPDU的响应帧的指示信息。
MAC层竞争接入功能 DCF或 EDCAF收到一个 RXERROR值不是 NoError而是 AIDorGIDnotMatch或者 notRecipient等类似的值的 PHY- RXE D. indication,若原语中 不包括当前 PPDU 的响应帧的指示, 则进行竞争接入时使用 EIFS 或 EIFS-DIFS+AIFS[AC]; 若原语中包含包括当前 PPDU的响应帧的指示信息, 则使用的 帧间间隔为 aSIFSTime + xIFS+ ACKTxTime, 其中 aSIFSTime为协议规定的短帧间间 隔时间, xIFS 为协议定义的收到正确帧后, 竞争接入实体使用的正常帧间间隔, ACKTxTime为估计的应答帧传输时间,不同的应答帧类型可以有不同的值, 当指示当 前 PPDU 没有无线帧时, 使用的帧间间隔可以是 xIFS, 即不包括 aSIFSTime 和 ACKTxTime 另外如果 PHY- RXE D.indication指示了当前帧所在的传输机会没有结 束还有后续的帧发送, 则旁听站点要等到传输机会指示为结束时才能进行信道接入。 根据本发明实施例, 还提供了一种站点, 包括本发明上述实施例提供的无线帧的 接收装置和信道竞争的接入装置。 其中, 无线帧的接收装置和信道竞争的接入装置可 以采用上述实施例所描述的结构, 并具有上述实施例所述的特征, 具体不再赘述。 从以上的描述中, 可以看出, 本发明实现了如下技术效果: 站点的第一功能实体 检测到信道信号强度到达预定门限, 开始接收无线帧, 并向站点的第二功能实体发送 信道检测结果为忙的指示; 第一功能实体确定站点不是无线帧的目标接收站点时, 向 第二功能实体发送无线帧的接收结束指示。 在无线帧传输结束时, 第一功能实体向第 二功能实体发送信道检测结果为闲的指示,提供了具有抛弃无线帧而不更新 NAV功能 的站点的接收操作处理流程。 站点的第二功能实体接收站点的第一功能实体发送的无 线帧的接收结束指示, 并根据接收结束指示确定站点不是无线帧的目标接收站点; 第 二功能实体接收第一功能实体发送的信道检测结果为闲的指示, 在等待不小于一个帧 间间隔时间后, 进行信道竞争接入, 从而避免了旁听站点与其他站点同时向同一站点 发送无线帧而造成的碰撞。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 并且在某些情况下, 可以以不同于此处 的顺序执行所示出或描述的步骤, 或者将它们分别制作成各个集成电路模块, 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样, 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技 术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的 任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种无线帧的接收方法, 包括:
站点的第一功能实体检测到信道信号强度到达预定门限, 所述第一功能实 体开始接收无线帧, 并向所述站点的第二功能实体发送信道检测结果为忙的指 示;
所述第一功能实体确定所述站点不是所述无线帧的目标接收站点, 向所述 第二功能实体发送无线帧的接收结束指示;
在所述无线帧传输结束时, 所述第一功能实体向所述第二功能实体发送信 道检测结果为闲的指示。
2. 根据权利要求 1所述的方法, 其中, 所述第一功能实体确定所述站点不是所述 无线帧的目标接收站点, 包括:
所述第一功能实体确定所述无线帧的物理层帧头部分指示的身份标识信息 与所述站点的身份标识信息不匹配, 或所述无线帧的物理层帧头部分指示的组 标识指示所述无线帧的目标站点为接入点或无线网格网络 Mesh站点, 而所述 站点不是接入点或 Mesh站点, 则确定所述站点不是所述无线帧的目标接收站 点; 或者
所述第一功能实体确定所述无线帧的物理层帧头部分指示的组标识对应的 分组不是所述站点所在的分组, 或所述站点在所述分组内时所述分组中指示的 时空流数指示所述无线帧中不包含所述站点的数据, 则确定所述站点不是所述 无线帧的目标接收站点。
3. 根据权利要求 1所述的方法, 其中, 所述接收结束指示包括: 接收结束的原因 或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包 括以下之一: 部分身份标识或组标识不匹配, 或者站点为非目标接收方, 或站 点主动丢弃帧。
4. 根据权利要求 1所述的方法, 其中, 所述第一功能实体确定所述站点不是所述 无线帧的目标接收站点时, 所述方法还包括:
所述第一功能实体根据所述无线帧的物理层帧头的信令指示信息确定所述 无线帧传输结束的时刻, 并在所述无线帧传输结束之前保持信道的指示为忙。
5. 根据权利要求 1至 4中任一项所述的方法, 其中, 所述第一功能实体用于检测 信号强度, 在无线信道上收发无线帧, 以及为所述第二功能实体提供服务; 所 述第二功能实体, 用于控制所述第一功能实体对无线信道的接入, 接收并解码 所述第一功能实体发送的数据单元, 发送数据单元给所述第一功能实体并请求 服务, 以及进行虚拟载波检测控制。
6. 一种信道竞争的接入方法, 包括:
站点的第二功能实体接收所述站点的第一功能实体发送的无线帧的接收结 束指示;
所述第二功能实体根据所述接收结束指示确定所述站点不是所述无线帧的 目标接收站点;
所述第二功能实体接收所述第一功能实体发送的信道检测结果为闲的指 示, 若需要进行信道竞争接入, 则在等待预定时间后进行信道竞争接入, 其中, 所述预定时间不小于一个帧间间隔时间。
7. 根据权利要求 6所述的方法, 其中, 所述接收结束指示包括: 接收结束的原因 或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包 括以下之一: 部分身份标识或组标识不匹配, 或者站点为非目标接收方, 或站 点主动丢弃帧。
8. 根据权利要求 6或 7所述的方法, 其中, 所述一个帧间间隔时间为一个扩展帧 间间隔时间, 其中, 所述扩展帧间间隔时间为一个短帧间间隔时间、 一个应答 帧的传输时间和一个接收到正确帧的情况下使用的帧间间隔时间三者之和。
9. 根据权利要求 8所述的方法, 其中, 所述应答帧的传输时间为根据所述站点支 持的速率集中最低的速率和预定义的应答帧确认帧计算得出的时间。
10. 根据权利要求 7所述的方法, 其中, 所述接收结束指示还包括: 所述无线帧的 响应帧的指示信息, 其中, 所述响应帧的指示信息包括: 所述无线帧是否需要 回复响应帧的指示信息, 以及在需要回复响应帧的情况下所述响应帧的类型信 息。
11. 根据权利要求 10所述的方法, 其中, 若所述响应帧的指示信息指示所述无线帧需要回复响应帧, 则所述一个帧 间间隔时间为一个短帧间间隔时间、 一个接收到正确帧的情况下使用的帧间间 隔时间、 及一个所述响应帧的传输时间三者之和;
若所述响应帧的指示信息指示所述无线帧不需要回复响应帧, 则所述一个 帧间间隔时间为一个接收到正确帧的情况下所使用的帧间间隔时间。
12. 根据权利要求 11所述的方法,其中,所述响应帧的传输时间为根据预定义的速 率和所述响应帧的类型信息确定的时间。
13. 一种无线帧的接收装置, 位于站点的第一功能实体, 包括:
第一发送模块, 设置为检测到信道信号强度到达预定门限, 开始接收无线 帧, 向所述站点的第二功能实体发送信道检测结果为忙的指示;
第一确定模块, 设置为确定所述站点不是所述无线帧的目标接收站点; 第二发送模块, 设置为在所述第一确定模块确定所述站点不是所述无线帧 的目标接收站点时, 向所述第二功能实体发送无线帧的接收结束指示;
第三发送模块, 设置为在所述无线帧传输结束时, 向所述第二功能实体发 送信道检测结果为闲的指示。
14. 根据权利要求 13所述的装置, 其中, 所述第一确定模块包括: 第一确定单元, 设置为确定所述无线帧的物理层帧头部分指示的身份标识 信息与所述站点的身份标识信息不匹配, 或所述无线帧的物理层帧头部分指示 的组标识指示所述无线帧的目标站点为接入点或无线网格网络 Mesh站点, 而 所述站点不是接入点或 Mesh站点, 则确定所述站点不是所述无线帧的目标接 收站点;
第二确定单元, 设置为确定所述无线帧的物理层帧头部分指示的组标识对 应的分组不是所述站点所在的分组, 或所述站点在所述分组内时所述分组中指 示的时空流数指示所述无线帧中不包含所述站点的数据, 则确定所述站点不是 所述无线帧的目标接收站点。
15. 根据权利要求 13所述的装置, 其中, 所述接收结束指示包括: 接收结束的原因 或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包 括以下之一: 部分身份标识或组标识不匹配, 或者站点为非目标接收方, 或站 点主动丢弃帧。
16. 根据权利要求 13所述的装置, 其中, 所述装置还包括: 第二确定模块, 设置为在所述第一确定模块确定所述站点不是所述无线帧 的目标接收站点时, 根据所述无线帧的物理层帧头的信令指示信息确定所述无 线帧传输结束的时刻, 并在所述无线帧传输结束之前保持信道的指示为忙。
17. 一种信道竞争的接入装置, 位于站点的第二功能实体, 包括:
第一接收模块, 设置为接收所述站点的第一功能实体发送的无线帧的接收 结束指示;
确定模块, 设置为根据所述接收结束指示确定所述站点不是所述无线帧的 目标接收站点;
第二接收模块, 设置为接收所述第一功能实体发送的信道检测结果为闲的 指示;
接入模块, 设置为在需要进行信道竞争接入时, 等待预定时间后进行信道 竞争接入, 其中, 所述预定时间不小于一个帧间间隔时间。
18. 根据权利要求 17所述的装置, 其中, 所述接收结束指示包括: 接收结束的原因 或接收结束的状态信息, 其中, 所述接收结束的原因或接收结束的状态信息包 括以下之一: 部分身份标识或组标识不匹配, 或者站点为非目标接收方, 或站 点主动丢弃帧。
19. 根据权利要求 18所述的装置,其中,所述一个帧间间隔时间为一个扩展帧间间 隔时间, 其中, 所述扩展帧间间隔时间为一个短帧间间隔时间、 一个应答帧的 传输时间和一个接收到正确帧的情况下使用的帧间间隔时间三者之和。
20. 根据权利要求 19所述的装置, 其中, 所述接收结束指示还包括: 所述无线帧的 响应帧的指示信息, 其中, 所述响应帧的指示信息包括: 所述无线帧是否需要 回复响应帧的指示信息, 以及在需要回复响应帧的情况下所述响应帧的类型信 息。
21. 根据权利要求 20所述的装置, 其中, 若所述响应帧的指示信息指示所述无线帧需要回复响应帧, 则所述一个帧 间间隔时间为一个短帧间间隔时间、 一个接收到正确帧的情况下使用的帧间间 隔时间、 及一个所述响应帧的传输时间三者之和; 若所述响应帧的指示信息指示所述无线帧不包含响应帧, 则所述一个帧间 间隔时间为一个接收到正确帧的情况下所使用的帧间间隔时间。
22. 一种站点, 包括: 无线帧的接收装置和信道竞争的接入装置, 其中,
所述无线帧的接收装置, 包括:
第一发送模块, 设置为检测到信道信号强度到达预定门限, 开始接收无线 帧, 向所述信道竞争的接入装置发送信道检测结果为忙的指示;
第一确定模块, 设置为确定所述站点不是所述无线帧的目标接收站点; 第二发送模块, 设置为在所述第一确定模块确定所述站点不是所述无线帧 的目标接收站点时, 向所述信道竞争的接入装置发送无线帧的接收结束指示; 第三发送模块, 设置为在所述无线帧传输结束时, 向所述信道竞争的接入 装置发送信道检测结果为闲的指示;
所述信道竞争的接入装置, 包括:
第一接收模块, 设置为接收所述无线帧的接收装置发送的无线帧的接收结 束指示;
确定模块, 设置为根据所述接收结束指示确定所述站点不是所述无线帧的 目标接收站点;
第二接收模块, 设置为接收所述无线帧的接收装置发送的信道检测结果为 闲的指示;
接入模块, 设置为在需要进行信道竞争接入时, 等待预定时间后进行信道 竞争接入, 其中, 所述预定时间不小于一个帧间间隔时间。
23. 根据权利要求 22所述的站点, 其中, 所述第一确定模块包括:
第一确定单元, 设置为确定所述无线帧的物理层帧头部分指示的身份标识 信息与所述站点的身份标识信息不匹配, 或所述无线帧的物理层帧头部分指示 的组标识指示所述无线帧的目标站点为接入点或无线网格网络 Mesh站点, 而 所述站点不是接入点或 Mesh站点, 则确定所述站点不是所述无线帧的目标接 收站点;
第二确定单元, 设置为确定所述无线帧的物理层帧头部分指示的组标识对 应的分组不是所述站点所在的分组, 或所述站点在所述分组内时所述分组中指 示的时空流数指示所述无线帧中不包含所述站点的数据, 则确定所述站点不是 所述无线帧的目标接收站点。
24. 根据权利要求 22所述的站点, 其中, 所述无线帧的接收装置还包括:
第二确定模块, 设置为在所述第一确定模块确定所述站点不是所述无线帧 的目标接收站点时, 根据所述无线帧的物理层帧头的信令指示信息确定所述无 线帧传输结束的时刻, 并在所述无线帧传输结束之前保持信道的指示为忙。
25. 根据权利要求 22至 24中任一项所述的站点, 其中, 所述接收结束指示包括: 接收结束的原因或接收结束的状态信息, 其中, 所述接收结束的原因或接收结 束的状态信息包括以下之一: 部分身份标识或组标识不匹配, 或者站点为非目 标接收方, 或站点主动丢弃帧。
26. 根据权利要求 25所述的站点,其中,所述一个帧间间隔时间为一个扩展帧间间 隔时间, 其中, 所述扩展帧间间隔时间为一个短帧间间隔时间、 一个应答帧的 传输时间和一个接收到正确帧的情况下使用的帧间间隔时间三者之和。
27. 根据权利要求 25所述的站点, 其中, 所述接收结束指示还包括: 所述无线帧的 响应帧的指示信息, 其中, 所述响应帧的指示信息包括: 所述无线帧是否需要 回复响应帧的指示信息, 以及在需要回复响应帧的情况下所述响应帧的类型信 息。
28. 根据权利要求 27所述的站点, 其中, 若所述响应帧的指示信息指示所述无线帧需要回复响应帧, 则所述一个帧 间间隔时间为一个短帧间间隔时间、 一个接收到正确帧的情况下使用的帧间间 隔时间、 及一个所述响应帧的传输时间三者之和;
若所述响应帧的指示信息指示所述无线帧不包含响应帧, 则所述一个帧间 间隔时间为一个接收到正确帧的情况下所使用的帧间间隔时间。
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