CN103248462B - Method, equipment and the system that data retransmit in WLAN - Google Patents
Method, equipment and the system that data retransmit in WLAN Download PDFInfo
- Publication number
- CN103248462B CN103248462B CN201310148464.2A CN201310148464A CN103248462B CN 103248462 B CN103248462 B CN 103248462B CN 201310148464 A CN201310148464 A CN 201310148464A CN 103248462 B CN103248462 B CN 103248462B
- Authority
- CN
- China
- Prior art keywords
- pifs
- frame
- transmission
- carry out
- radio frames
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention discloses the methods that data in a kind of WLAN (WLAN) retransmit, this method comprises: after sending radio frames, sender judges whether to need to carry out PIFS re-transmission according to the channel detection result after the instruction information for being used to indicate recipient's frame acknowledgment mode and the transmission radio frames of the radio frames；After determining that needing to carry out point coordination function interframe space (PIFS) retransmits, PIFS re-transmission is carried out.The present invention discloses equipment and system that data in a kind of WLAN retransmit, using method of the invention, equipment and system, can efficiently reduce data in quick Frame switch and retransmit the probability to collide, and then improve the utilization rate of channel.
Description
Technical field
The present invention relates to WLAN (WLAN, Wireless Local Area Networks) technologies, more particularly to
Method, equipment and the system that data retransmit in a kind of WLAN.
Background technique
Currently, WLAN is fast-developing, growing to the application demand of WLAN in field of wireless.For WLAN skill
Art, Institute of Electrical and Electric Engineers industrial specification IEEE802.11 group successively define 802.11a, 802.11b and
Then, and there are other task groups successively in the series of standards such as 802.11g, are dedicated to development and are related to existing 802.11 standard
Improved specification.Wherein, 802.11ah task groups are mainly worked out empty using the wlan network for exempting from licensed band below 1GHz frequency range
Mouth standard, with the network application for supporting smart grid and sensor network etc. new.
The basic framework of WLAN refers to a basic service set (BSS, Basic Service Set), and a BSS includes:
One access point (AP, Access Point) and multiple websites (STA, Station) associated with AP.802.11 standards are fixed
Two kinds of operation modes of justice, are respectively as follows: distributed coordination function (DCF, Distributed Coordination Function)
With point coordination function (PCF, Point Coordination Function), while also defining for both operation modes
Improvement, be respectively as follows: enhanced distributed channel access (EDCA, Enhanced Distributed Channel Access)
(HCCA, Hybrid Coordination Function Controlled is accessed with Hybrid Coordination Function control channel
Channel Access).Wherein, DCF is most basic operation mode, utilizes the Carrier Sense Multiple Access for having conflict avoidance
Mechanism (CSMA/CA, CSMA with Collision Avoidance), makes multiple STA sharing wireless channels.EDCA is enhancing
Type operation mode is based on CSMA/CA mechanism, supports multiple and different priority query's sharing wireless channels, and with transmission opportunity
(TXOP, Transmission Opportunity) is the data that unit sends each queue with priority.
When exempting from licensed band resource using 1GHz or less, handed in order to reduce channel access quantity competition-based and frame
It changes, to improve the utilization rate of channel, reduce the energy consumption of STA, IEEE proposes quick Frame switch (Speed frame
Exchange method), so that more frames is able to use short interFrameGap (SIFS, Short Interframe Space) as far as possible
To be transmitted.Fig. 1 is the schematic diagram of Speed frame exchange process, as shown in Figure 1, needing to send upstream data
(DATA) when, STA sends DATA frame to AP, and AP carries out frame acknowledgment to the DATA frame of STA, and STA is completed by multiple Frame switch
The transmission of row data；Correspondingly, AP can be in the last one acknowledgement frame if AP has downlink data transmission to STA instruction
After SIFS, downlink DATA frame is sent to STA.Wherein, in Speed frame exchange, confirmation for frame, there are two
Kind validation testing, respectively explicit confirmation confirm with implicit；Wherein, the explicit confirmation refers to: recipient is to the data received
Frame is responded using confirmation (ACK) frame or block confirmation (BA) frame；The implicit confirmation refers to: recipient is to the data frame received
A unicast frame is sent to sender, sender receives the confirmation being considered after unicast frame to the data frame sent before.
In addition, IEEE alsies specify retransmission mechanism, specifically, the STA for participating in Speed frame exchange is allowed to exist
In point coordination function interframe space (PIFS, Point coordination function Interframe Space), if
It detects channel idle, then can start to retransmit on the boundary PIFS.But if receiving-transmitting sides all start weight on the boundary PIFS
Pass, then can collide, for example for, as shown in Fig. 2, STA sends data frame to AP, AP is properly received the data of STA
Frame, and a data frame is sent in response to STA after SIFS.Since STA is after having sent the SIFS of data frame, detect
Channel busy does not come out the AP data frame analyzing sent, therefore, can be in PIFS when detecting channel idle in PIFS
Boundary is to AP retransmitting data frame；At this point, and after AP sends data frame to STA, channel idle is detected in PIFS, also can be
The boundary PIFS initiates to retransmit to STA, in this way, the data that STA and AP is sent will collide, in this way, will increase Frame switch
Several and channel access number, that is to say, that will affect and reduce Frame switch in Speed frame exchange, reduce channel access
The original idea of number, to will cause the decline of channel utilization.
Summary of the invention
In view of this, the main purpose of the present invention is to provide method, equipment and system that data in a kind of WLAN retransmit,
Data in Speed frame exchange can be efficiently reduced and retransmit the probability to collide.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The present invention provides the methods that data in a kind of WLAN retransmit, which comprises
After sending radio frames, sender believes according to the instruction for being used to indicate recipient's frame acknowledgment mode in the radio frames
The channel detection result after the radio frames is ceased and sent, judges whether to need to carry out PIFS re-transmission；Determination needs to carry out PIFS
After re-transmission, PIFS re-transmission is carried out.
In above scheme, physics that the instruction information for being used to indicate recipient's frame acknowledgment mode passes through the radio frames
More than one bit information in frame head and/or media access control (MAC, Media Access Control) frame head refers to
Show.
In above scheme, the frame acknowledgment mode of the recipient is explicit confirmation or is implicitly to confirm.
In above scheme, described sender is according to the instruction for being used to indicate recipient's frame acknowledgment mode in the radio frames
Channel detection result after information and the transmission radio frames, judges whether to need to carry out PIFS re-transmission, comprising:
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
When explicit confirmation, if detecting channel idle within the period of setting, described sender needs to carry out PIFS re-transmission；Such as
Fruit detects channel busy within the period of the setting, and receives the radio frames of mistake, then described sender needs to carry out
PIFS is retransmitted.
In above scheme, described sender is according to the instruction for being used to indicate recipient's frame acknowledgment mode in the radio frames
Channel detection result after information and the transmission radio frames, judges whether to need to carry out PIFS re-transmission, comprising:
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
When implicit confirmation, if detecting channel idle within the period of setting, described sender needs to carry out PIFS re-transmission；Such as
Fruit detects channel busy within the period of the setting, and receives the radio frames of mistake, then described sender does not need to carry out
PIFS is retransmitted.
In above scheme, the physical frame header and/or mac frame head of the radio frames include that more than one bit is used to indicate
The instruction information that Speed frame exchange starts.
Invention further provides the methods that data in a kind of WLAN retransmit, which comprises
After receiving the radio frames comprising the instruction information for being used to indicate recipient's frame acknowledgment mode and carrying out frame acknowledgment, receive
Root is used to indicate the instruction information of recipient's frame acknowledgment mode described in, judges whether to need to carry out PIFS re-transmission；Determining needs
After carrying out PIFS re-transmission, PIFS re-transmission is carried out.
In above scheme, the recipient is according to the instruction information for being used to indicate recipient's frame acknowledgment mode, judgement
Whether need to carry out PIFS re-transmission, comprising:
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
When explicit confirmation, the recipient does not need to carry out PIFS re-transmission；
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
Implicit confirmation, and after carrying out frame acknowledgment, if detecting channel idle within the period of setting, the recipient need into
Row PIFS is retransmitted.
The present invention also provides the sending devices that data in a kind of WLAN retransmit, and the sending device includes: the first judgement
Module and the first retransmission module；Wherein,
The first judgment module is used to indicate receiving device according in the radio frames after sending radio frames
The instruction information and the channel detection result after the transmission radio frames of frame acknowledgment mode, judge whether to need to carry out PIFS weight
It passes, determines after needing to carry out PIFS re-transmission, trigger first retransmission module；
First retransmission module, for carrying out PIFS re-transmission by after first judgment module triggering.
In above scheme, the first judgment module is specifically used for: being used to indicate receiving device frame acknowledgment mode when described
Instruction information when indicating that the frame acknowledgment mode of the receiving device is explicit confirmation, if detected within the period of setting
Channel idle then needs to carry out PIFS re-transmission；If detecting channel busy within the period of the setting, and receive mistake
Radio frames then need to carry out PIFS re-transmission；Alternatively,
When the instruction information for being used to indicate receiving device frame acknowledgment mode indicates the frame acknowledgment side of the receiving device
When formula is implicit confirmation, if detecting channel idle within the period of the setting, need to carry out PIFS re-transmission；If
Channel busy is detected within the period of the setting, and receives the radio frames of mistake, then does not need to carry out PIFS re-transmission.
Invention further provides the receiving devices that data in a kind of WLAN retransmit, and the receiving device includes: the second judgement
Module and the second retransmission module；Wherein,
Second judgment module includes the nothing for being used to indicate the instruction information of receiving device frame acknowledgment mode for receiving
After line frame and progress frame acknowledgment, according to the instruction information for being used to indicate receiving device frame acknowledgment mode, judge whether to need
PIFS re-transmission is carried out, is determined after needing to carry out PIFS re-transmission, second retransmission module is triggered；
Second retransmission module, for carrying out PIFS re-transmission by after the triggering of the second judgment module.
In above scheme, second judgment module is specifically used for: being used to indicate receiving device frame acknowledgment mode when described
Instruction information when indicating that the frame acknowledgment mode of the receiving device is explicit confirmation, do not need to carry out PIFS re-transmission；When described
The instruction information for being used to indicate receiving device frame acknowledgment mode indicates that the frame acknowledgment mode of the receiving device is implicit confirmation, and
After carrying out frame acknowledgment, if detecting channel idle within the period of setting, then it is assumed that need to carry out PIFS re-transmission.
The present invention also provides in a kind of WLAN data retransmit system, the system comprises above-mentioned sending device and on
The receiving device stated.
Method, equipment and the system that data retransmit in WLAN provided by the invention, after sending radio frames, sender is according to institute
It states the instruction information for being used to indicate recipient's frame acknowledgment mode in radio frames and sends the Channel Detection knot after the radio frames
Fruit judges whether to need to carry out PIFS re-transmission；It determines after needing to carry out PIFS re-transmission, carries out PIFS re-transmission；Correspondingly, receiving institute
After stating radio frames and carrying out frame acknowledgment, the recipient according to the instruction information for being used to indicate recipient's frame acknowledgment mode,
Judge whether to need to carry out PIFS re-transmission；It determines after needing to carry out PIFS re-transmission, carries out PIFS re-transmission, specify that receiving-transmitting sides exist
Re-transmission initiator in re-transmission, in this way, can efficiently reduce what data re-transmission in Speed frame exchange collided
Probability, and then improve the utilization rate of channel.
Detailed description of the invention
Fig. 1 is the process schematic of Speed frame exchange in WLAN；
Fig. 2 is that PIFS retransmits the process schematic to collide in WLAN；
Fig. 3 is the method flow schematic diagram that data retransmit in WLAN of the present invention；
Fig. 4 is the embodiment of the present invention when the frame acknowledgment mode of the instruction information instruction recipient in data frame is ACK frame
PIFS retransmit schematic diagram；
Fig. 5 is the embodiment of the present invention when the frame acknowledgment mode of the instruction information instruction recipient in data frame is BA frame
PIFS retransmits schematic diagram；
Fig. 6 is the embodiment of the present invention when the frame acknowledgment mode of the instruction information instruction recipient in data frame is data frame
PIFS retransmit schematic diagram；
Fig. 7 is the sending device structural schematic diagram that data retransmit in WLAN of the present invention；
Fig. 8 is the receiving device structural schematic diagram that data retransmit in WLAN of the present invention；
Fig. 9 is the system structure diagram that data retransmit in WLAN of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further described in more detail.
In the following description, channel idle will be detected in PIFS, and start the data weight of progress on the boundary PIFS
It passes, referred to as PIFS is retransmitted.
The method that data retransmit in a kind of WLAN provided by the invention, comprising: after sending radio frames, sender is according to described
The channel detection result after the instruction information for being used to indicate recipient's frame acknowledgment mode and the transmission radio frames in radio frames,
Judge whether to need to carry out PIFS re-transmission；It determines after needing to carry out PIFS re-transmission, carries out PIFS re-transmission.
The method that data retransmit in another WLAN provided by the invention, comprising: receive true comprising being used to indicate itself frame
After recognizing the radio frames of the instruction information of mode and carrying out frame acknowledgment, recipient is used to indicate receiving device frame acknowledgment side according to described
The instruction information of formula judges whether to need to carry out PIFS re-transmission；It determines after needing to carry out PIFS re-transmission, carries out PIFS re-transmission.
The method that data retransmit in WLAN, as shown in Figure 3, comprising the following steps:
Step 301: after sending radio frames, sender is used to indicate recipient's frame acknowledgment mode according in the radio frames
Instruction information and send the channel detection result after the radio frames, judge whether to need to carry out PIFS re-transmission；It determines and needs
After carrying out PIFS re-transmission, PIFS re-transmission is carried out；
Here, when described sender is STA, the recipient is AP；Correspondingly, when described sender is AP, institute
Stating recipient is STA.
The instruction information for being used to indicate recipient's frame acknowledgment mode by the physical frame headers of the radio frames and/or
More than one bit information in mac frame head indicates.
Further, the physical frame header of the radio frames and/or mac frame head may include more than one bit and be used to indicate
The instruction information that Speed frame exchange starts.
The frame acknowledgment mode of the recipient can be explicit confirmation, can also be implicit confirmation；Wherein, described explicit true
Recognize and refers to the radio frames received are responded using ACK frame or BA frame；The implicit confirmation refers to and makes to the radio frames received
It is responded with data frame.
Described sender is according to the instruction information and transmission for being used to indicate recipient's frame acknowledgment mode in the radio frames
Channel detection result after the radio frames judges whether to need to carry out PIFS re-transmission, specifically include:
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
When explicit confirmation, if detecting channel idle within the period of setting, described sender thinks to need to carry out PIFS weight
It passes；If detecting channel busy within the period of the setting, and the radio frames of mistake are received, then described sender thinks to need
Carry out PIFS re-transmission；
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
When implicit confirmation, if detecting channel idle within the period of the setting, described sender thinks to need to carry out
PIFS is retransmitted；If detecting channel busy within the period of the setting, and the radio frames of mistake are received, then described sender
Think not needing to carry out PIFS re-transmission.
Wherein, in actual application, the period of the setting may include: between duration+one of a SIFS
+ one physical layer of duration of gap (Slot) sends the time delay of message, with the description in ieee standard, the setting to MAC layer
Period are as follows: aSIFSTime+aSlotTime+aPHY-RX-START-Delay；Correspondingly, described detect that channel idle is
Refer to: the physical layer of described sender does not trigger RXSTART. indication；It is described to detect that channel busy refers to: described sender
Physical layer trigger RXSTART. indication；It is described receive mistake radio frames refer to: the MAC layer of described sender according to
The RXEND. of the physical layer from described sender received confirms primitive, judges the radio frames for receiving mistake.
It is not pass of the present invention that how described sender, which determines that recipient uses the concrete processing procedure of which kind of frame acknowledgment mode,
The content of the heart.
Step 302: after receiving the radio frames and carrying out frame acknowledgment, the recipient is used to indicate recipient according to described
The instruction information of frame acknowledgment mode judges whether to need to carry out PIFS re-transmission；It determines after needing to carry out PIFS re-transmission, carries out PIFS
It retransmits.
Here, the recipient judges whether to need according to the instruction information for being used to indicate recipient's frame acknowledgment mode
PIFS re-transmission is carried out, is specifically included:
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
When explicit confirmation, the recipient thinks not needing to carry out PIFS re-transmission；
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is
Implicit confirmation, and after progress frame acknowledgment, if detecting channel idle within the period of the setting, the recipient recognizes
To need to carry out PIFS re-transmission.
Correspondingly, the recipient detects that channel idle refers to: the physical layer of the recipient triggers RXSTART.
Indication.
The present invention is described in further detail again below with reference to embodiment.
It should be understood that in example 1 and example 2, the period of setting are as follows: aSIFSTime+
aSlotTime+aPHY-RX-START-Delay；Correspondingly, sender detects that channel idle refers to: the object of described sender
Reason layer does not trigger RXSTART. indication；Described sender detects that channel busy refers to: the physical layer touching of described sender
RXSTART. indication is sent out；The radio frames for receiving mistake refer to: the MAC layer of described sender comes from according to what is received
The RXEND. of the physical layer of described sender confirms primitive, judges the radio frames for receiving mistake；Recipient detects channel sky
Spare time refers to: the physical layer of the recipient does not trigger RXSTART. indication.
Embodiment one
In this implementation, sender STA, recipient AP.
After STA competition to channel, short frame can be used, such as request sends (RTS, Request To Send) frame/clear
Except transmission (CTS, Clear To Send) frame reserve channel, then use data frame as Speed frame exchange's
Initial frame, and the data frame is sent to the AP；Wherein, pass through ACK Indication in the data frame as initial frame
Indicate the beginning of Speed frame exchange, the data frame packet as initial frame is true containing the AP frame is used to indicate
Recognize the instruction information of mode, specifically, the instruction information for being used to indicate the AP frame acknowledgment mode is by described as just
The ACK Indication of the data frame of beginning frame indicates the frame acknowledgment mode of the AP.
When the ACK Indication indicates that the frame acknowledgment mode of the AP is ACK frame, as shown in figure 4, for institute
STA is stated, if detecting channel idle within the period of setting, the STA carries out PIFS re-transmission；If in the setting
Period in detect channel busy, and in the radio frames for receiving the mistake from the AP, then the STA is receiving the mistake
Accidentally after frame, PIFS re-transmission is carried out；For the AP, after the data frame for receiving mistake or after having sent ACK frame, the AP is equal
It is retransmitted without PIFS.
When the ACK Indication indicates that the frame acknowledgment mode of the AP is BA frame, as shown in figure 5, for described
STA, if detecting channel idle within the period of the setting, the STA carries out PIFS re-transmission；If set described
Channel busy is detected in the period set, and in the radio frames for receiving the mistake from the AP, then the STA is receiving this
After erroneous frame, PIFS re-transmission is carried out；For the AP, after the data frame for receiving mistake or after having sent BA frame, the AP
Retransmitted without PIFS.
When the ACK Indication indicates that the frame acknowledgment mode of the AP is data frame, as shown in fig. 6, for institute
STA is stated, if detecting channel idle within the period of the setting, the STA carries out PIFS re-transmission；If described
Detect channel busy in the period of setting, and in the radio frames for receiving the mistake from the AP, then the STA without
PIFS is retransmitted；For the AP, channel idle is detected within the period for sending the setting after data frame, then the AP
Carry out PIFS re-transmission.
Embodiment two
In this implementation, sender STA, recipient AP.
After the STA competition to channel, data frame is used to pass through work as the initial frame of Speed frame exchange
The beginning of Speed frame exchange is indicated for 1 bit information of the mac frame head of the data frame of the initial frame of initial frame, and
The data frame is sent to the AP；Wherein, the data frame packet as initial frame, which contains, is used to indicate the frame acknowledgment side AP
The instruction information of formula, specifically, the instruction information for being used to indicate the AP frame acknowledgment mode are used as initial frame by described
More than one bit information of data frame indicate the frame acknowledgment mode of the AP；Further, described to be used to indicate the AP
The instruction information of frame acknowledgment mode can be by the physical frame header and/or mac frame head of the data frame as initial frame
More than one bit information indicates the frame acknowledgment mode of the AP.
When one above bit information indicates that the frame acknowledgment mode of the AP is ACK frame, as shown in figure 4, for
The STA, if detecting channel idle within the period of setting, the STA carries out PIFS re-transmission；If set described
Channel busy is detected in the period set, and in the radio frames for receiving the mistake from the AP, then the STA is receiving this
After erroneous frame, PIFS re-transmission is carried out；For the AP, after the data frame for receiving mistake or after having sent ACK frame, the AP
Retransmitted without PIFS.
When one above bit information indicates that the frame acknowledgment mode of the AP is BA frame, as shown in figure 5, for institute
STA is stated, if detecting channel idle within the period of the setting, the STA carries out PIFS re-transmission；If described
Channel busy is detected in the period of setting, and in the radio frames for receiving the mistake from the AP, then the STA is being received
After the erroneous frame, PIFS re-transmission is carried out；It is described after the data frame for receiving mistake or after having sent BA frame for the AP
AP is retransmitted without PIFS.
When one above bit information indicates that the frame acknowledgment mode of the AP is data frame, as shown in fig. 6, for
The STA, if detecting channel idle within the period of the setting, the STA carries out PIFS re-transmission；If institute
State and measure channel busy in the period of setting, and receiving from the AP mistake radio frames, then the STA without
PIFS is retransmitted；For the AP, channel idle is detected within the period for sending the setting after data frame, then the AP
Carry out PIFS re-transmission.
Based on the above method, the present invention also provides the sending devices that data in a kind of WLAN retransmit, as shown in fig. 7, should
Sending device includes: first judgment module 71 and the first retransmission module 72；Wherein,
The first judgment module 71 is set after sending radio frames according to the reception that is used to indicate in the radio frames
The instruction information and the channel detection result after the transmission radio frames of standby frame acknowledgment mode, judge whether to need to carry out PIFS weight
It passes, determines after needing to carry out PIFS re-transmission, trigger first retransmission module 72；
First retransmission module 72, for carrying out PIFS re-transmission by after the first judgment module 71 triggering.
Wherein, the first judgment module 71, is specifically used for: when the finger for being used to indicate receiving device frame acknowledgment mode
When showing that information indicates that the frame acknowledgment mode of the receiving device is explicit confirmation, if detecting channel within the period of setting
It is idle, then it is assumed that need to carry out PIFS re-transmission；If detecting channel busy within the period of the setting, and receive mistake
Radio frames, then it is assumed that need to carry out PIFS re-transmission；Alternatively,
When the instruction information for being used to indicate receiving device frame acknowledgment mode indicates the frame acknowledgment side of the receiving device
When formula is implicit confirmation, if detecting channel idle within the period of the setting, then it is assumed that need to carry out PIFS re-transmission；
If detecting channel busy within the period of the setting, and receive the radio frames of mistake, then it is assumed that do not need to carry out PIFS
It retransmits.
To realize the above method, invention further provides the receiving devices that data in a kind of WLAN retransmit, as shown in figure 8,
The receiving device includes: the second judgment module 81 and the second retransmission module 82；Wherein,
Second judgment module 81 includes the instruction information for being used to indicate receiving device frame acknowledgment mode for receiving
After radio frames and progress frame acknowledgment, according to the instruction information for being used to indicate receiving device frame acknowledgment mode, judge whether to need
PIFS re-transmission is carried out, is determined after needing to carry out PIFS re-transmission, second retransmission module 82 is triggered；
Second retransmission module 82, for carrying out PIFS re-transmission by after second judgment module 82 triggering.
Wherein, second judgment module 82, is specifically used for: when the finger for being used to indicate receiving device frame acknowledgment mode
When showing that information indicates that the frame acknowledgment mode of the receiving device is explicit confirmation, it is believed that do not need to carry out PIFS re-transmission；When described
The instruction information for being used to indicate receiving device frame acknowledgment mode indicates that the frame acknowledgment mode of the receiving device is implicit confirmation, and
After carrying out frame acknowledgment, if detecting channel idle in SIFS, then it is assumed that need to carry out PIFS re-transmission.
Based on the above method and equipment, the present invention also provides the systems that data in a kind of WLAN retransmit, as shown in figure 9,
The system includes: sending device 91 and receiving device 92；Wherein,
The sending device 91, after sending radio frames to the receiving device 92, according to the use in the radio frames
Channel detection result in the instruction information for indicating the 92 frame acknowledgment mode of receiving device and after sending the radio frames, judgement
Whether need to carry out PIFS re-transmission；It determines after needing to carry out PIFS re-transmission, carries out PIFS re-transmission；
The receiving device 92, after receiving the radio frames and progress frame acknowledgment that the sending device 91 is sent,
According to the instruction information for being used to indicate receiving device frame acknowledgment mode in the radio frames, judge whether to need to carry out PIFS weight
It passes；It determines after needing to carry out PIFS re-transmission, carries out PIFS re-transmission.
Specifically, reception first is used to indicate according in the radio frames by the first judgment module of the sending device 91
The instruction information and the channel detection result after the transmission radio frames of equipment frame acknowledgment mode, judge whether to need to carry out PIFS
It retransmits；It determines after needing to carry out PIFS re-transmission, triggers the first retransmission module of the sending device 91；It is retransmitted again by described first
Module carries out PIFS re-transmission；
Correspondingly, first receiving the nothing that the sending device 91 is sent by the second judgment module of the receiving device 92
After line frame and progress frame acknowledgment, according to the instruction information for being used to indicate receiving device frame acknowledgment mode in the radio frames, sentence
It is disconnected whether to need to carry out PIFS re-transmission；It determines after needing to carry out PIFS re-transmission, trigger the receiving device 92 second retransmits mould
Block；PIFS re-transmission is carried out by second retransmission module again.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (9)
1. a kind of method that data retransmit in WLAN (WLAN), which is characterized in that the described method includes:
Send radio frames after, sender according in the radio frames the instruction information for being used to indicate recipient's frame acknowledgment mode and
Channel detection result after sending the radio frames judges whether to need to carry out point coordination function interframe space (PIFS) re-transmission；
It determines after needing to carry out PIFS re-transmission, carries out PIFS re-transmission；
Wherein, described sender is according to the instruction information and transmission for being used to indicate recipient's frame acknowledgment mode in the radio frames
Channel detection result after the radio frames judges whether to need to carry out PIFS re-transmission, comprising:
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is explicit
When confirmation, if detecting channel idle within the period of setting, described sender needs to carry out PIFS re-transmission；If
Channel busy is detected in the period of the setting, and receives the radio frames of mistake, then described sender needs to carry out PIFS weight
It passes；
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is implicit
When confirmation, if detecting channel idle within the period of setting, described sender needs to carry out PIFS re-transmission；If
Channel busy is detected in the period of the setting, and receives the radio frames of mistake, then described sender does not need to carry out PIFS
It retransmits.
2. the method according to claim 1, wherein the instruction letter for being used to indicate recipient's frame acknowledgment mode
Breath is referred to by more than one bit information in physical frame header and/or media access control (MAC) frame head of the radio frames
Show.
3. method according to claim 1 or 2, which is characterized in that the physical frame header and/or mac frame head of the radio frames
The instruction information that quick Frame switch starts is used to indicate comprising more than one bit.
4. a kind of method that data retransmit in WLAN, which is characterized in that the described method includes:
After receiving the radio frames comprising the instruction information for being used to indicate recipient's frame acknowledgment mode and carrying out frame acknowledgment, root is received
According to the instruction information for being used to indicate recipient's frame acknowledgment mode, judge whether to need to carry out PIFS re-transmission；Determine need into
After row PIFS is retransmitted, PIFS re-transmission is carried out；
The recipient judges whether to need to carry out PIFS according to the instruction information for being used to indicate recipient's frame acknowledgment mode
It retransmits, comprising:
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is explicit
When confirmation, the recipient does not need to carry out PIFS re-transmission；
When the instruction information for being used to indicate recipient's frame acknowledgment mode indicates that the frame acknowledgment mode of the recipient is implicit
Confirmation, and after progress frame acknowledgment, if detecting channel idle within the period of setting, the recipient needs to carry out
PIFS is retransmitted.
5. according to the method described in claim 4, it is characterized in that, the instruction letter for being used to indicate recipient's frame acknowledgment mode
Breath is indicated by more than one bit information in the physical frame header and/or mac frame head of the radio frames.
6. method according to claim 4 or 5, which is characterized in that the physical frame header and/or mac frame head of the radio frames
The instruction information that quick Frame switch starts is used to indicate comprising more than one bit.
7. in a kind of WLAN data retransmit sending device, which is characterized in that the sending device include: first judgment module and
First retransmission module；Wherein,
The first judgment module, after sending radio frames, according in the radio frames to be used to indicate receiving device frame true
Recognize the instruction information of mode and send the channel detection result after the radio frames, judges whether to need to carry out PIFS re-transmission, really
Surely after needing to carry out PIFS re-transmission, first retransmission module is triggered；
First retransmission module, for carrying out PIFS re-transmission by after first judgment module triggering；
The first judgment module, is specifically used for: when the instruction information instruction for being used to indicate receiving device frame acknowledgment mode
When the frame acknowledgment mode of the receiving device is explicit confirmation, if detecting channel idle within the period of setting, need
Carry out PIFS re-transmission；If detecting channel busy within the period of the setting, and the radio frames of mistake are received, then needed
Carry out PIFS re-transmission；Alternatively,
When the instruction information for being used to indicate receiving device frame acknowledgment mode indicates that the frame acknowledgment mode of the receiving device is
When implicit confirmation, if detecting channel idle within the period of the setting, need to carry out PIFS re-transmission；If institute
It states and detects channel busy in the period of setting, and receive the radio frames of mistake, then do not need to carry out PIFS re-transmission.
8. in a kind of WLAN data retransmit receiving device, which is characterized in that the receiving device include: the second judgment module and
Second retransmission module；Wherein,
Second judgment module includes the radio frames for being used to indicate the instruction information of receiving device frame acknowledgment mode for receiving
And after carrying out frame acknowledgment, according to the instruction information for being used to indicate receiving device frame acknowledgment mode, judge whether to need to carry out
PIFS is retransmitted, and is determined after needing to carry out PIFS re-transmission, and second retransmission module is triggered；
Second retransmission module, for carrying out PIFS re-transmission by after the triggering of the second judgment module；
Second judgment module, is specifically used for: when the instruction information instruction for being used to indicate receiving device frame acknowledgment mode
When the frame acknowledgment mode of the receiving device is explicit confirmation, do not need to carry out PIFS re-transmission；It is used to indicate reception when described and sets
The instruction information of standby frame acknowledgment mode indicates that the frame acknowledgment mode of the receiving device is implicit confirmation, and after progress frame acknowledgment,
If detecting channel idle within the period of setting, then it is assumed that need to carry out PIFS re-transmission.
9. the system that data retransmit in a kind of WLAN, which is characterized in that the system comprises sending devices as claimed in claim 7
And receiving device according to any one of claims 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310148464.2A CN103248462B (en) | 2013-04-25 | 2013-04-25 | Method, equipment and the system that data retransmit in WLAN |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310148464.2A CN103248462B (en) | 2013-04-25 | 2013-04-25 | Method, equipment and the system that data retransmit in WLAN |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103248462A CN103248462A (en) | 2013-08-14 |
| CN103248462B true CN103248462B (en) | 2019-01-15 |
Family
ID=48927701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310148464.2A Active CN103248462B (en) | 2013-04-25 | 2013-04-25 | Method, equipment and the system that data retransmit in WLAN |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103248462B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337705B (en) * | 2014-08-06 | 2020-06-23 | 中兴通讯股份有限公司 | Data transmission feedback, data transmission method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1429494A1 (en) * | 2001-09-17 | 2004-06-16 | Sharp Kabushiki Kaisha | Communication management method, communication terminal, communication management program, recording medium containing the communication management program, and communication system |
| CN101449521A (en) * | 2006-05-22 | 2009-06-03 | 高通股份有限公司 | Collision avoidance for traffic in a wireless network |
| CN102684852A (en) * | 2011-03-31 | 2012-09-19 | 北京新岸线无线技术有限公司 | Method and device for frame acknowledgement |
| CN102739375A (en) * | 2011-03-31 | 2012-10-17 | 北京新岸线无线技术有限公司 | Method and device for retransmission |
| CN102843220A (en) * | 2011-06-21 | 2012-12-26 | 华为技术有限公司 | Error recovery method, access point equipment, station equipment and error recovery system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101242311B1 (en) * | 2011-12-15 | 2013-03-11 | 포항공과대학교 산학협력단 | Method for retransmitting data |
-
2013
- 2013-04-25 CN CN201310148464.2A patent/CN103248462B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1429494A1 (en) * | 2001-09-17 | 2004-06-16 | Sharp Kabushiki Kaisha | Communication management method, communication terminal, communication management program, recording medium containing the communication management program, and communication system |
| CN101449521A (en) * | 2006-05-22 | 2009-06-03 | 高通股份有限公司 | Collision avoidance for traffic in a wireless network |
| CN102684852A (en) * | 2011-03-31 | 2012-09-19 | 北京新岸线无线技术有限公司 | Method and device for frame acknowledgement |
| CN102739375A (en) * | 2011-03-31 | 2012-10-17 | 北京新岸线无线技术有限公司 | Method and device for retransmission |
| CN102843220A (en) * | 2011-06-21 | 2012-12-26 | 华为技术有限公司 | Error recovery method, access point equipment, station equipment and error recovery system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103248462A (en) | 2013-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9295074B2 (en) | Acknowledgement, error recovery and backoff operation of uplink multi-user multiple-input-multiple-output communication in wireless networks | |
| US20190174484A1 (en) | Method for transmitting a response request frame and a response frame in a multi-user based wireless communication system | |
| EP2966924B1 (en) | Service data transmission processing, transmission method and device | |
| CN102883460B (en) | A kind of service data transmission method and system | |
| JP4480563B2 (en) | QoS control method for wireless LAN base station apparatus | |
| WO2014135066A1 (en) | Resource allocation information processing method and device | |
| JP5043854B2 (en) | Data frame transmission method, storage medium, and data frame transmission device | |
| US20140293868A1 (en) | Method and apparatus for providing feedback | |
| EP2595443A1 (en) | Method and Apparatus for Transmitting Control Frame to Hidden Node in Wireless LAN | |
| US8320397B2 (en) | Backoff adjustment method for MAC system | |
| JP2005318487A (en) | Communication apparatus, communication system, communication method, and communication control program | |
| US9883530B2 (en) | Radio frame receiving method and device | |
| JP2006129393A (en) | Communication apparatus and communication method | |
| US20150146600A1 (en) | Method and device for acquiring and transmitting data by an sta in a wireless local area network | |
| CN110859010B (en) | Conflict detection method and device for realizing data transmission | |
| CN102695286A (en) | Method and apparatus for network allocation vector resetting | |
| KR20150005093A (en) | Communication method of an access point and a terminal for retransmission of multicast packet in a network including access point and a plurality of terminals | |
| US9713169B2 (en) | Method and apparatus for controlling startup of request to send/clear to send mechanism | |
| JP2008054347A (en) | Communication apparatus, communication system, communication method, and communication control program | |
| CN103248462B (en) | Method, equipment and the system that data retransmit in WLAN | |
| KR20120065913A (en) | Method and apparatus for transmitting a packet in a wireless local area network | |
| WO2017114033A1 (en) | Method for determining transmission opportunity and access point | |
| CN112511363A (en) | Time delay performance evaluation method and device and storage medium | |
| CN104639303A (en) | Wireless network multi-access point associated acknowledgement frame detecting method | |
| WO2023083023A1 (en) | Data transmission method and apparatus, storage medium, and program product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |