CN104378184B - Error recovery method, access point apparatus, site apparatus and its system - Google Patents
Error recovery method, access point apparatus, site apparatus and its system Download PDFInfo
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- CN104378184B CN104378184B CN201410709969.6A CN201410709969A CN104378184B CN 104378184 B CN104378184 B CN 104378184B CN 201410709969 A CN201410709969 A CN 201410709969A CN 104378184 B CN104378184 B CN 104378184B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
An embodiment of the present invention provides error recovery method, access point apparatus, site apparatus and its systems.Error recovery method includes：To the website transmission data frame for allowing access into battery saving mode, data frame is used to indicate user data and is sent；If not receiving the acknowledgement frame that website is returned in response to data frame, data are retransmitted to website within the current transmission chance time.Based on above-mentioned technical proposal, access point within the current transmission chance time by directly being retransmitted, without Fault recovery must be carried out by competing the new transmission opportunity time, it can accelerate the time of Fault recovery, the delay for restoring mistake is reduced, avoids carrying out unnecessary transmission opportunity race in the case of can realizing Fault recovery in the current transmission chance time, so as to improve the efficiency of Fault recovery, Internet resources are saved, and are improved service quality.
Description
Technical field
The present invention relates to WLAN field, and more particularly, to the Fault recovery in WLAN field
Method, access point apparatus, site apparatus and its system.
Background technology
A kind of transmission opportunity (Transmit opportunity, TXOP) power saving (Power is introduced in new standard
Save, PS) electricity-saving mechanism, in TXOP PS electricity-saving mechanisms, allow to support the website (Station, STA) of the mechanism when
Enter sleep state when meeting specified conditions in the TXOP times, so as to achieve the purpose that power saving.
Access point (Access point, AP) can be by setting VHT-SIG-A1 (Very High Throughout
Signal-A1, very high throughput information A1) in TXOP_PS_NOT_ALLOWED (not allowing TXOP PS) field indicate
The STA in TXOP PS patterns whether is allowed to enter sleep state, when the field is 0, represents to allow under TXOP PS patterns
STA enter sleep state, otherwise do not allow access into sleep state.
In a TXOP times, if the STA in TXOP PS patterns is allowed, which to enter sleep state, enters power saving mould
Formula, then the STA needs judge whether to meet specified conditions, if meeting specified conditions, the STA enter sleep state until
The current TXOP times terminate, and AP cannot give within the remaining time of current TXOP times and have allowed for into dormant
STA retransmits data.
Turning one of specified conditions of state into sleep is：The STA has been replied in response to more data field (More
Data Field) for 0 frame acknowledgement frame.The frame that more data fields (More Data Field) are 0 is designation date transmission
The data frame finished carries the user data for being sent to STA in the frame, and indicates subsequently not being then forwarded to STA's
User data, then STA after acknowledgement frame is returned enter sleep state with power saving.
In the prior art, STA will enter sleep after receiving the frame that More Data Field are 0 and returning to acknowledgement frame
State, and AP will stop again to the STA transmission datas after the frame that More Data Field are 0 is sent to STA.
But if there is mistake or is 0 in response to More Data Field in the frame that More Data Field are 0
The acknowledgement frame of frame there is mistake, then will all AP be caused not receive acknowledgement frame so that More Data Field are 0 frame
There is mistake in corresponding transmission.In the prior art, if AP does not receive acknowledgement frame, AP will cache the More Data
Field is 0 frame, in the TXOP times that competition is communicated with STA to another again and then to STA retransmissions
The More Data Field are 0 frame, and receive corresponding acknowledgement frame again, to carry out Fault recovery.This will cause transmission to be imitated
The reduction of rate, and could carry out Fault recovery due to needing to compete to the new TXOP times so that the time delay of Fault recovery adds
Greatly, service quality reduces.
Invention content
An embodiment of the present invention provides error recovery method, access point apparatus, site apparatus and its systems, can be to avoid only
Fault recovery can be carried out when competition is to next transmission opportunity time so that can be carried out within the current transmission chance time
Fault recovery, so as to improve the efficiency of Fault recovery and improve service quality.
On the one hand, an embodiment of the present invention provides a kind of error recovery method, including：To the station for allowing access into battery saving mode
Point transmission data frame, the data frame are used to indicate user data and are sent；If the website is not received in response to institute
The acknowledgement frame of data frame return is stated, the data frame is retransmitted to the website within the current transmission chance time.
On the other hand, an embodiment of the present invention provides a kind of error recovery method, including：Receive the data that access point is sent
Frame, the data frame are used to indicate user data and are sent；Described access point is received within the current transmission chance time again
The data frame that the data frame sent, wherein described access point retransmit is not receiving confirmation by described access point
It is sent in the case of frame, the acknowledgement frame is by allowing access into the website of battery saving mode in the data frame for receiving described access point transmission
When return..
In another aspect, an embodiment of the present invention provides a kind of access point apparatus, including：Sending module, for allow into
Enter the website transmission data frame of battery saving mode, the data frame is used to indicate user data and is sent；Retransmission module, for such as
Fruit does not receive the acknowledgement frame that the website is returned in response to the data frame, to the website within the current transmission chance time
Retransmit the data frame.
Another aspect, an embodiment of the present invention provides a kind of site apparatus, including：First receiving module, for connecing
The data frame that access point is sent, the data frame are used to indicate user data and are sent；Second receiving module, for working as forward pass
The data frame that described access point retransmits, the number that wherein described access point retransmits are received in the defeated chance time
It is sent according to frame by described access point in the case where not receiving acknowledgement frame, the acknowledgement frame is by allowing access into the station of battery saving mode
Point is returned in the data frame for receiving described access point transmission.
Another aspect, an embodiment of the present invention provides a kind of system for Fault recovery, including access point apparatus and station
Point device.Described access point equipment is used for the site apparatus transmission data frame for allowing access into battery saving mode, the data
Frame is used to indicate user data and is sent；If the confirmation that the site apparatus is returned in response to the data frame is not received
Frame retransmits the data frame within the current transmission chance time to the site apparatus.The site apparatus is used to receive
The data frame that described access point equipment is sent；Described access point equipment is received within the current transmission chance time to retransmit
The data frame.
Based on above-mentioned technical proposal, access point is by sending the data frame that is sent of instruction user data but not having
In the case of receiving acknowledgement frame, the data frame directly is retransmitted within the current transmission chance time, is needed like that rather than the prior art
Again to compete the new transmission opportunity time could be retransmitted so that can be carried out mistake within the current transmission chance time
Accidentally restore, so as to accelerate the time of Fault recovery, reduce the delay for restoring mistake, avoiding can in the current transmission chance time
Unnecessary transmission opportunity race is carried out in the case of to realize Fault recovery, so as to improve the effect of Fault recovery
Rate saves Internet resources, and improves service quality.
Description of the drawings
It in order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this field
For technical staff, without creative efforts, other attached drawings are can also be obtained according to these attached drawings.
Fig. 1 is the flow chart of error recovery method according to embodiments of the present invention.
Fig. 2 is the flow chart of another error recovery method according to embodiments of the present invention.
Fig. 3 is the flow chart of another error recovery method according to embodiments of the present invention.
Fig. 4 is the flow chart of another error recovery method according to embodiments of the present invention.
Fig. 5 is the structure diagram of access point apparatus according to embodiments of the present invention.
Fig. 6 is the structure diagram of another access point apparatus according to embodiments of the present invention.
Fig. 7 is the structure diagram of site apparatus according to embodiments of the present invention.
Fig. 8 is the structure diagram of another site apparatus according to embodiments of the present invention.
Fig. 9 is the structure diagram of the system for Fault recovery according to embodiments of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution of the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is the part of the embodiment rather than whole embodiments of the present invention.Based on the present invention
In the embodiment, the every other implementation that those skilled in the art are obtained under the premise of creative work is not made
Example, should all belong to the scope of protection of the invention.
First, error recovery method 100 according to embodiments of the present invention is described with reference to Fig. 1.
As shown in Figure 1, method 100 includes：In S110, to the website transmission data frame for allowing access into battery saving mode, number
User data is used to indicate according to frame to be sent；In S120, if not receiving the confirmation that website is returned in response to data frame
Frame retransmits data frame within the current transmission chance time to website.
For example, method 100 can be performed by access point.Access point allows access into sleep shape to battery saving mode is allowed access into
After the website of state sends the data frame that instruction user data is sent, if not receiving acknowledgement frame, in current transmission
The data frame is retransmitted to the website in the chance time, when needing to compete new transmission opportunity again like that rather than the prior art
Between could retransmit, so as to be possible to carry out Fault recovery within the current transmission chance time, be not necessarily required to compete again new
The transmission opportunity time carry out Fault recovery, so as to avoid unnecessary time waste and unnecessary competition generates
The wasting of resources, and the efficiency of Fault recovery can be improved.
In S110, the data frame that instruction user data is sent can be the data that More Data Field are 0
Frame, it is follow-up not in the user data for being sent to website by data frame instruction.In the prior art, when AP has sent this
After data frame, no matter whether AP is properly received acknowledgement frame, and AP no longer retransmits the data frame to website, the communication knot with website
Beam particularly, if AP does not receive acknowledgement frame, is retransmitted the new transmission opportunity time is competed.And in the present invention
Embodiment in, if AP does not receive acknowledgement frame, will directly within the current transmission chance time carry out data frame re-transmission.
In S120, AP does not receive acknowledgement frame and includes two kinds of situations：First, AP does not receive any frame, it may be possible to due to
Website does not receive data frame or data frame decoding error without sending acknowledgement frame, it is also possible to be acknowledgement frame in transmission process
Middle loss, AP do not sense the presence of acknowledgement frame；Second is that AP has received frame, but AP is to the frame decoding mistake, and causes AP
It is acknowledgement frame not know the frame.
Either it that case, AP is to website retransmitting data frame, in some cases it is possible that realizing mistake
Recovery.For example, it is caused by not sending acknowledgement frame due to website that AP, which does not receive acknowledgement frame, website does not receive number at this time
According to frame or data frame decoding error, website will not enter sleep state.In this case, AP retransmitting data frames may be realized wrong
Recovery accidentally.
According to one embodiment of present invention, AP can be within the predetermined time in the current transmission chance time to website weight
New transmission data frame, wherein website enters sleep state after the predetermined time.
A predetermined time can be preset between AP and website, even if website is properly received instruction user data hair
It send the data frame finished and returns acknowledgement frame, website also not immediately enters sleep state, and certain time is waited for enter back into and is slept
Dormancy state.In this way, can be that AP progress Fault recoveries leave time redundancy, to cause AP confirming frame loss or mistake occur
In the case of not receiving acknowledgement frame, AP is made to have an opportunity to carry out Fault recovery within the current transmission chance time.Work as the predetermined time
During arrival, AP determines that website enters sleep state, in the re-transmission for being off data frame.
According to an embodiment of the invention, the predetermined time can be no less than SIFS (Short Interframe Space, it is short
Frame period) time.
For example, the predetermined time can be TxPIFS.TxPIFS is the difference of PIFS and aTxRxturnaroundTime.Wherein,
ATxRxturnaroundTime is with the value in different WiFi (Wireless Fidelity, adopting wireless fidelity technology) systems
It is different, when using ofdm system, aTxRxturnaroundTime is generally less than 2 microseconds, passes through
ATxRxturnaroundTime can characterize the time interval that transmission state is converted to from the state of monitor channel.PIFS is
The sum of SIPS and aSlotTime (slot time), aSlotTime represents time quantum, in 802.11ac standards,
ASlotTime can be 9 microseconds.
For another example the predetermined time can be no less than PIFS (Point (coordination function)
Interframe Space, point (coordination function) frame pitch) time.For example, the predetermined time can be DIFS
(Distributed (coordination function) Interframe Space are distributed (coordination function) frame pitch).
DIFS can be the sum of PIFS and aSlotTime.For another example the predetermined time can be TxDIFS.TxDIFS be DIFS with
The difference of aTxRxturnaroundTime.
According to one embodiment of present invention, AP can be retransmitted predetermined time within the current transmission chance time to website
Several data frames.
If AP does not receive acknowledgement frame, data frame directly can be retransmitted certain number by AP, to be possible to working as forward pass
The reason of recovery of mistake is realized in the defeated chance time, such as AP is caused not receive acknowledgement frame is that website does not receive data frame
Or data frame decoding error, at this time website do not enter into sleep state, can be in current transmission chance by directly being retransmitted
Restore mistake in time.
According to one embodiment of present invention, data frame can be retransmitted one by AP within the current transmission chance time to website
It is secondary.It is generally thought that when AP re-transmissions once do not achieve the effect that Fault recovery, subsequently retransmitted again with recovery mistake
Possibility is relatively low, thus only carry out it is primary retransmit can be played in the efficiency of Fault recovery and the expense of Internet resources it is good
Compromise, is saved due to causing unnecessary network overhead when the re-transmission of excessive number cannot still restore mistake.
Error recovery method according to embodiments of the present invention, by sending the data for indicating that user data is sent
Frame but in the case of not receiving acknowledgement frame, directly retransmits the data frame, rather than existing skill within the current transmission chance time
Art, which needs to compete like that the new transmission opportunity time again, to be retransmitted so that can within the current transmission chance time
To carry out Fault recovery, so as to accelerate the time of Fault recovery, the delay for restoring mistake is reduced, is avoided in current transmission machine
Unnecessary transmission opportunity race is carried out in the case of time can realizing Fault recovery, it is extensive so as to improve mistake
Multiple efficiency saves Internet resources, and improves service quality.
Fig. 2 is the flow chart of error recovery method 200 according to embodiments of the present invention.
In S210, to the website transmission data frame for allowing access into battery saving mode, data frame is used to indicate user data hair
It send and finishes.The step and S110 are essentially identical.
According to one embodiment of present invention, S212 and S220 can be included after S210.In S212, if true
The clear channel assessment result detected in the predetermined receiving time of frame is recognized less than predetermined threshold, determines not receive acknowledgement frame；
In S220, data frame is retransmitted to website within the current transmission chance time.
AP can be to confirm by detecting clear channel assessment (CCA) (Clear Channel Assessment, CCA) result
It is no to receive acknowledgement frame.AP can be by monitoring and measuring the carrier energy on channel, to detect CCA results.
Due to defining the interval time between data frame and the acknowledgement frame of reply, such as SIFS, therefore AP in a standard
After website transmission data frame, AP waits for the acknowledgement frame that receiving station returns.If website can be properly received data frame,
The SIFS times that then website can be after data frame receipt terminates reply acknowledgement frame.The transmission time of acknowledgement frame in the channel is not
It is fixed, it is different with the difference of transmission bandwidth and modulation system.
Although the transmission time of acknowledgement frame is not fixed, that is, the conveying length of acknowledgement frame is not fixed, but determines that frame
Conveying length can at least include targeting sequencing and data portion, wherein, data portion is for carrying confirmation message, different
Data portion has different minimum lengths under standard.For example, in 802.11 standards, targeting sequencing can include L-STF
(Legacy Short Training Field, the Short Training domain left), L-LTF (Legacy Long Training
Field, the long training domain left) and L-SIG (Legacy Signal, the information left), data portion can at least include one
A Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Divided Modulation, OFDM) symbol, therefore acknowledgement frame
Conveying length is at least the sum of L-STF, L-LTF, L-SIG and OFDM symbol.Specifically, in 802.11ac standards, L-STF
For 8 microseconds, L-LTF is 8 microseconds, and L-SIG is 4 microseconds, and an OFDM symbol is 4 microseconds, therefore the transmission time of acknowledgement frame is extremely
It is 24 microseconds less.
For AP, the predetermined receiving time of acknowledgement frame can from AP to website transmission data frame after start, also may be used
The SIFS times to be waited for start after from AP to website transmission data frame.When the predetermined receiving time of acknowledgement frame is from AP transmission datas
When frame is started, the predetermined receiving time of acknowledgement frame can continue the PIFS times.When the predetermined receiving time of acknowledgement frame is from AP to station
When the waiting SIFS times start after point transmission data frame, the predetermined receiving time of acknowledgement frame can continue the most short pass of acknowledgement frame
The defeated time can also continue the time shorter than the minimum transmission time of acknowledgement frame.For example, in current standard, AP is being sent
After data frame, the SIFS times is waited for start to detect CCA the random time as a result, the time persistently detected is no more than 24 microseconds.
If CCA results are less than predetermined threshold in the lasting detection time no more than 24 microseconds, it is determined that do not receive acknowledgement frame.
AP is in the predetermined receiving time of acknowledgement frame, if the CCA results detected are always below predetermined threshold, it is determined that
Acknowledgement frame is not received, if the CCA results detected in any time of period are not less than predetermined threshold, it is determined that Ke Nengshou
Acknowledgement frame is arrived.
According to one embodiment of present invention, S214 and S220 can be included after S210.In S214, if AP exists
CCA results are detected in the predetermined receiving time of acknowledgement frame not less than predetermined threshold, illustrate that AP has received frame, but if the frame
Decoding error, AP still not can know that the frame is acknowledgement frame, and then AP determines not receive acknowledgement frame；In S220, current
In the transmission opportunity time data frame is retransmitted to website.
The error recovery method provided according to embodiments of the present invention, it is empty by being detected in the predetermined receiving time of acknowledgement frame
Channel assessment for AP as a result, provide a kind of mode for effectively determining whether to receive acknowledgement frame so that AP can be in acknowledgement frame
Predetermined receiving time in quickly determine whether mistake, AP to be helped quickly to carry out Fault recovery, so as to help mistake
Accidentally restore the raising of efficiency.
Next, error recovery method 300 according to embodiments of the present invention is described with reference to figure 3.
As shown in figure 3, method 300 includes：In S310, the data frame that access point is sent is received, data frame is used to indicate
User data is sent；In S320, the data frame that access point retransmits is received within the current transmission chance time, wherein
The data frame that access point retransmits is sent by access point in the case where not receiving acknowledgement frame, and acknowledgement frame is by allowing access into province
The website of power mode is returned in the data frame for receiving access point transmission.
For example, method 300 can be performed by STA.STA receives the data frame that the instruction user data of AP transmissions is sent
Later, if AP does not receive the acknowledgement frame that STA is returned in response to data frame, to STA weights within the current transmission chance time
Data frame is passed, so that it is possible that Fault recovery is can be carried out within the current transmission chance time, without having to compete for
The new transmission opportunity time could carry out Fault recovery.Since the operation of STA is corresponding with the operation of AP, because of the method 300
Related content can be with the corresponding description in reference method 100, and in order to avoid repeating, details are not described herein.
In S310, the data frame that instruction user data is sent can be the data that More Data Field are 0
Frame.STA may be since the data frame decoding error be without returning to acknowledgement frame；It is also possible to return acknowledgement frame, but AP does not have
Receive the acknowledgement frame.
In S320, AP is not when receiving acknowledgement frame to STA retransmitting data frames.It may be true that AP, which does not receive acknowledgement frame,
Recognize frame not send out, it is also possible to be to confirm frame loss, it is also possible to be acknowledgement frame decoding error.In this way, it is possible to
The recovery of mistake can be realized in the current transmission chance time.AP can determine to be by detecting clear channel assessment result
No to receive acknowledgement frame, related content can refer to S212 and S214 in the above method 200.
Error recovery method according to embodiments of the present invention allows access into the website of battery saving mode in current transmission chance
In can receive access point re-transmission instruction user data be sent data frame, cause within the current transmission chance time
Fault recovery is can be carried out, access point is needed to compete the new transmission opportunity time again like that rather than the prior art could
It is retransmitted, therefore the time of Fault recovery can be accelerated, reduced the delay for restoring mistake, avoid in the current transmission chance time
Unnecessary transmission opportunity race is carried out in the case of can realizing Fault recovery, so as to improve the effect of Fault recovery
Rate saves Internet resources, and improves service quality.
Fig. 4 is the flow chart of error recovery method 400 according to embodiments of the present invention.
In S410, the data frame that access point is sent is received, data frame is used to indicate user data and is sent.The step
It is essentially identical with S310.
According to one embodiment of present invention, S422 can be included after S410.In S422, if data frame decoding
Mistake then receives the data frame that access point retransmits within the current transmission chance time.
Due to the data frame decoding error that STA is received, STA will not return to acknowledgement frame, will not enter sleep state, because
This AP can restore mistake within the current transmission chance time to STA retransmitting data frames completely, without as the prior art that
Sample stops data transmission, competes the new transmission opportunity time again to be retransmitted, and causes unnecessary transmission delay, mistake
Restore the reduction of efficiency, and waste Internet resources.The data frame that STA is retransmitted by directly receiving AP in current transmission chance,
The recovery of mistake can be just realized within the current transmission chance time, Fault recovery efficiency is improved, caused by reducing resource contention
Network overhead, and improve service quality.
According to one embodiment of present invention, S424 can be included after S410.In the s 424, if data frame decoding
Correctly, then after acknowledgement frame is sent to access point, access point weight is received in the predetermined time within the current transmission chance time
The data frame newly sent, and enter sleep state after the predetermined time.
Since the data frame decoding that STA is received is correct, STA returns to acknowledgement frame to AP.Since acknowledgement frame is in transmission process
In mistake can occur so that AP may not receive acknowledgement frame, i.e., may lose may also decoding error for acknowledgement frame.Therefore,
It is corrected in order to which issuable mistake is given to leave time redundancy, STA not immediately enters and sleep after acknowledgement frame is returned
Dormancy state, and the predetermined time is waited for enter back into, it may be retransmitted with receiving AP in the given time due to not receiving acknowledgement frame
Data frame so that the success rate for restoring mistake within the current transmission chance time can be improved, so as to avoid AP competing
The new transmission opportunity time is striven to carry out Fault recovery.
According to one embodiment of present invention, the predetermined time can be no less than the time of SIFS.Since STA is continuously connecing
Shortest time interval is SIFS in the case of receiving the data frame that AP is sent, so if AP is retransmitted to STA, STA receives number
It is at least SIFS, therefore STA at least needs that SIFS is waited for just to enter sleep state according to the time interval of frame.In 802.11ac standards
In, SIPS can be 16 microseconds.
According to one embodiment of present invention, the predetermined time can be TxPIFS.TxPIFS be PIFS with
The difference of aTxRxturnaroundTime.According to one embodiment of present invention, the predetermined time can be no less than PIFS when
Between.For example, the predetermined time can be DIFS (Distributed (coordination function) Interframe
Space is distributed (coordination function) frame pitch).DIFS can be the sum of PIFS and aSlotTime.For another example the predetermined time can be with
It is TxDIFS.TxDIFS is the difference of DIFS and aTxRxturnaroundTime.
According to one embodiment of present invention, the predetermined time can be sent out from the time for sending acknowledgement frame to access point is received
Give the time of the frame of other websites.
STA does not enter sleep state always after acknowledgement frame is returned, so that AP can be received due to not receiving really
The data frame recognized frame and retransmitted.If AP starts to send frame to other websites, it can be said that bright AP is successfully received acknowledgement frame,
Then the communication with other websites is carried out, therefore STA enters sleep state when receiving AP and being sent to the frame of other websites, to reach
To the purpose of power saving.
In addition, S422 and S424 can be located in different embodiments, can also be located in identical embodiment.Work as S422
When being in identical embodiment with S424, the execution sequence of S422 and S424 are not construed as limiting protection scope of the present invention,
S422 or S424 is performed based on the decoding result of data frame.
The error recovery method provided according to embodiments of the present invention, the number being sent due to STA in instruction user data
In the case of according to frame decoding mistake, the data frame of AP re-transmissions can be still received, even if rather than decoding error in the prior art
The data frame of re-transmission can not be received, in this way, mistake can be restored within the current transmission chance time.If in addition, STA
Acknowledgement frame is returned, STA also immediately enters sleep state unlike the prior art, and the predetermined time is waited for enter back into, this
Sample can be that there are the time redundancies of recovery for mistake caused by acknowledgement frame reception failure so that can be in the current transmission chance time
Interior carry out Fault recovery.Therefore, by using error recovery method according to embodiments of the present invention, Fault recovery can be accelerated
Time reduces the delay for restoring mistake, avoids carrying out not in the case of can realizing Fault recovery in the current transmission chance time
Necessary transmission opportunity race so as to improve the efficiency of Fault recovery, saves Internet resources, and improve Service Quality
Amount.
Described above is error recovery methods according to embodiments of the present invention, are described with reference to Fig. 5 to Fig. 8 according to this hair
The structure diagram of the relevant device for Fault recovery of bright embodiment.
Fig. 5 is the structure diagram of access point apparatus 500 according to embodiments of the present invention.
Access point apparatus 500 includes sending module 510 and retransmission module 520.Access point apparatus 500 can be wireless local
AP in net, to access the serve sites of network by it.Sending module 510 can be used for allowing access into battery saving mode
Website transmission data frame, data frame are used to indicate user data and are sent.If retransmission module 520 can be used for not receiving station
The acknowledgement frame that point is returned in response to data frame retransmits data frame within the current transmission chance time to website.
The above and other operation and/or function of sending module 510 and retransmission module 520 can refer to the above method 100
In S110 and 120, in order to avoid repeat, details are not described herein.
Access point apparatus provided in an embodiment of the present invention by send the data frame that is sent of instruction user data but
In the case of not receiving acknowledgement frame, directly retransmit the data frame within the current transmission chance time, rather than the prior art that
Sample, which needs to compete the new transmission opportunity time again, to be retransmitted so that can be within the current transmission chance time
Row Fault recovery so as to accelerate the time of Fault recovery, reduces the delay for restoring mistake, avoids in current transmission chance
Between can realize Fault recovery in the case of carry out unnecessary transmission opportunity race, so as to improve Fault recovery
Efficiency saves Internet resources, and improves service quality.
Fig. 6 is the structure diagram of access point apparatus 600 according to embodiments of the present invention.The transmission mould of access point apparatus 600
Block 610 and retransmission module 620 and the sending module 510 and retransmission module 520 of access point apparatus 500 are essentially identical.
According to an embodiment of the invention, retransmission module 620 can include the first retransmission unit 622 and/or the second re-transmission is single
Member 624.If the first retransmission unit 622 can be used for the clear channel assessment (CCA) knot detected in the predetermined receiving time of acknowledgement frame
Fruit is less than predetermined threshold, determines not receive acknowledgement frame, then retransmits data frame to website within the current transmission chance time.
If the second retransmission unit 624 can be used for the clear channel assessment result detected in the predetermined receiving time of acknowledgement frame not low
In the predetermined threshold, when the frame decoding mistake received in the predetermined receiving time in acknowledgement frame, determine not receiving confirmation
Frame then retransmits data frame within the current transmission chance time to website.
According to one embodiment of present invention, retransmission module 620 can be used for the pre- timing within the current transmission chance time
It is interior to retransmit data frame to website, wherein website enters sleep state after the predetermined time.
According to one embodiment of present invention, retransmission module 620 can be used within the current transmission chance time to website weight
The new data frame for sending pre-determined number.For example, pre-determined number can be 1 time.
The above and other operation and/or function of first retransmission unit 622, the second retransmission unit 624 and retransmission module 620
S212, S214 and S220 in the above method 200 and the S120 in method 100 can be referred to, in order to avoid repeating, herein not
It repeats again.
Access point apparatus provided in an embodiment of the present invention in the predetermined receiving time of acknowledgement frame by detecting idle channel
Assessment result effectively can determine whether to receive acknowledgement frame based on this so that access point apparatus can be in the predetermined of acknowledgement frame
Mistake is quickly determined whether in receiving time, to help quick progress Fault recovery, so as to which Fault recovery is helped to imitate
The raising of rate.
Fig. 7 is the structure diagram of site apparatus 700 according to embodiments of the present invention.
Site apparatus 700 includes the first receiving module 710 and the second receiving module 720.Site apparatus 700 can be calculated
Machine, server, user terminal etc. can access network by the access point of WLAN.First receiving module 710 can be used for
The data frame that access point is sent is received, data frame is used to indicate user data and is sent.Second receiving module 720 can be used for
The data frame that access point retransmits is received in the current transmission chance time, the data frame that wherein access point retransmits is by accessing
Point is sent in the case where not receiving acknowledgement frame, and acknowledgement frame is receiving access point transmission by the website for allowing access into battery saving mode
Data frame when return.
The above and other operation and/or function of first receiving module 710 and the second receiving module 720 can refer to above-mentioned
S310 and S320 in method 300, in order to avoid repeating, details are not described herein.
The site apparatus provided according to embodiments of the present invention allows access into the site apparatus of battery saving mode in current transmission machine
Understand the data frame that the instruction user data of access point re-transmission can be received in the time and is sent, so that in current transmission chance
It is interior to can be carried out Fault recovery, access point is needed to compete the new transmission opportunity time again like that rather than the prior art
It could be retransmitted, therefore the time of Fault recovery can be accelerated, reduced the delay for restoring mistake, avoid in current transmission chance
Time carries out unnecessary transmission opportunity race in the case of can realizing Fault recovery, so as to improve Fault recovery
Efficiency, save Internet resources, and improve service quality.
Fig. 8 is the structure diagram of site apparatus 800 according to embodiments of the present invention.The first of site apparatus 800 receives mould
The 720 basic phase of the first receiving module 710 and the second receiving module of 810 and second receiving module 820 of block and site apparatus 700
Together.
According to an embodiment of the invention, the second receiving module 820 can connect including the first receiving unit 822 and/or second
Receive unit 824.If the first receiving unit 822 can be used for data frame decoding error, received within the current transmission chance time
The data frame that access point retransmits.If the second receiving unit 824 can be used for data frame decoding correct, sent out to access point
After sending acknowledgement frame, the data frame of reception access point retransmission in the predetermined time within the current transmission chance time, and
Enter sleep state after predetermined time.
According to one embodiment of present invention, the predetermined time can be sent out from the time for sending acknowledgement frame to access point is received
Give the time of the frame of other websites.
According to one embodiment of present invention, the predetermined time can be no less than the time of SIFS.For example, the predetermined time can
To be TxPIFS.
According to one embodiment of present invention, the predetermined time can be no less than the time of PIFS, for example, the predetermined time can
To be DIFS or TxDIFS.
The above and other operation and/or function of first receiving module 822 and the second receiving module 824 can refer to above-mentioned
S422 and S424 in method 400, in order to avoid repeating, details are not described herein.
The site apparatus provided according to embodiments of the present invention, the number being sent due to site apparatus in instruction user data
In the case of according to frame decoding mistake, the data frame of access point re-transmission can be still received, even if rather than decoding in the prior art
Mistake can not receive the data frame of re-transmission, in this way, can restore mistake within the current transmission chance time.In addition, such as
Fruit site apparatus returns acknowledgement frame, and site apparatus also immediately enters sleep state unlike the prior art, and waits for pre-
It fixes time and enters back into, can be that there are the time redundancies of recovery for mistake caused by acknowledgement frame reception failure in this way so that Ke Yi
Fault recovery is carried out in the current transmission chance time.Therefore, by using site apparatus according to embodiments of the present invention, Ke Yijia
The time of fast Fault recovery, the delay for restoring mistake is reduced, avoids to realize Fault recovery in the current transmission chance time
In the case of carry out unnecessary transmission opportunity race, so as to improve the efficiency of Fault recovery, save Internet resources, and
It improves service quality.
In the following, the structure diagram with reference to Fig. 9 descriptions system 900 for Fault recovery according to embodiments of the present invention.System
System 900 includes access point apparatus 910 and site apparatus 920.
Access point apparatus 910 can be used for the 920 transmission data frame of site apparatus for allowing access into battery saving mode, and data frame is used
It is sent in instruction user data；If the acknowledgement frame that site apparatus 920 is returned in response to data frame is not received, current
In the transmission opportunity time data frame is retransmitted to site apparatus 920.
Site apparatus 920 can be used for receiving the data frame that access point apparatus 910 is sent；It is inscribed in the current transmission chance time
Receive the data frame that access point apparatus 910 retransmits.
The above and other operation and/or function of access point apparatus 910 can refer to the phase in the above method 100 and 200
Content is answered, the aforesaid operations and/or function of site apparatus 920 can refer to the corresponding contents in the above method 300 and 400, be
It avoids repeating, repeat no more.
System for Fault recovery according to embodiments of the present invention, access point apparatus is by sending instruction user data
The data frame that is sent but in the case of not receiving acknowledgement frame, directly to site apparatus within the current transmission chance time
The data frame is retransmitted, needing to compete the new transmission opportunity time like that rather than the prior art again could be retransmitted, and be made
It obtains and can be carried out Fault recovery within the current transmission chance time, so as to accelerate the time of Fault recovery, reduce and restore
The delay of mistake avoids carrying out unnecessary transmission opportunity in the case of can realizing Fault recovery in the current transmission chance time
Race so as to improve the efficiency of Fault recovery, saves Internet resources, and improve service quality.
It will be appreciated by those of skill in the art that with reference to the various method steps described in the embodiments described herein and
Unit can be realized with the combination of electronic hardware, computer software or the two, in order to clearly demonstrate hardware and software
Interchangeability, the step of generally describing each embodiment according to function in the above description and composition.These functions
It is performed actually with hardware or software mode, specific application and design constraint depending on technical solution.This field skill
Art personnel specifically can realize described function to each using distinct methods, but it is this realize it is not considered that
It is beyond the scope of this invention.
The software journey that can be performed with reference to the method and step that the embodiments described herein describes with hardware, processor
The combination of sequence or the two is implemented.Software program can be placed in random access memory (RAM), memory, read-only memory
(ROM), in electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In known any other form of storage medium.
Although having shown that and describing some embodiments of the present invention, it will be understood by those skilled in the art that not taking off
In the case of from the principle and spirit of the invention, these embodiments can be carry out various modifications, such modification should fall into this hair
In bright range.
Claims (25)
1. a kind of error recovery method, which is characterized in that including：
To the website transmission data frame for allowing access into TXOP battery saving modes, the data frame within the current transmission chance TXOP times
User data is used to indicate to be sent；
If not receiving the acknowledgement frame that the website is returned in response to the data frame, in the current transmission chance TXOP
Between the introversive website retransmit the data frame, do not need to compete new TXOP again.
2. error recovery method according to claim 1, which is characterized in that if described do not receive the website response
In the acknowledgement frame that the data frame returns, the data frame packet is retransmitted to the website within the current transmission chance time
It includes：
If the clear channel assessment result detected in the predetermined receiving time of the acknowledgement frame is less than predetermined threshold, determine
The acknowledgement frame is not received, then retransmits the data frame to the website within the current transmission chance time；Or
If the clear channel assessment result detected in the predetermined receiving time of the acknowledgement frame is not less than the predetermined threshold
Value when the frame decoding mistake received in the predetermined receiving time in the acknowledgement frame, determines not receiving the acknowledgement frame, then
Within the current transmission chance time data frame is retransmitted to the website.
3. error recovery method according to claim 1, which is characterized in that it is described within the current transmission chance time to institute
The website retransmission data frame is stated to include：
The data frame is retransmitted to the website in predetermined time within the current transmission chance time, wherein described pre-
The website enters sleep state after fixing time.
4. error recovery method according to claim 3, which is characterized in that the predetermined time is no less than short frame period
The time of SIFS.
5. error recovery method according to claim 4, which is characterized in that the predetermined time is sending point frame pitch
TxPIFS。
6. error recovery method according to claim 4, which is characterized in that the predetermined time is no less than a frame pitch
The time of PIFS.
7. error recovery method according to claim 6, which is characterized in that the predetermined time is distribution frame pitch DIFS
Or send distribution frame pitch TxDIFS.
8. error recovery method according to claim 1, which is characterized in that it is described within the current transmission chance time to institute
The website retransmission data frame is stated to include：
The data frame of pre-determined number is retransmitted to the website within the current transmission chance time.
9. error recovery method according to claim 8, which is characterized in that the pre-determined number is 1 time.
10. a kind of error recovery method, which is characterized in that including：
The data frame that access point is sent is received within the current transmission chance TXOP times, the data frame is used to indicate user data
It is sent；
The data frame that described access point retransmits is received within the current transmission chance TXOP times, wherein described connect
The data frame that access point retransmits is sent out by described access point in the case where not receiving acknowledgement frame in the current TXOP
It sending, the acknowledgement frame is returned by the website for allowing access into TXOP battery saving modes in the data frame for receiving described access point transmission,
It does not need to compete new TXOP again.
11. error recovery method according to claim 10, which is characterized in that described to be inscribed in the current transmission chance time
The data frame that described access point retransmits is received to include：
If the data frame decoding error, received within the current transmission chance time described in described access point retransmission
Data frame；Or
If the data frame decoding is correct, after the acknowledgement frame is sent to described access point, in current transmission chance
The data frame that described access point retransmits is received in predetermined time in time, and is entered after the predetermined time
Sleep state.
12. error recovery method according to claim 11, which is characterized in that the predetermined time is no less than short interframe
Every the time of SIFS.
13. error recovery method according to claim 12, which is characterized in that the predetermined time is sending point frame pitch
TxPIFS。
14. error recovery method according to claim 12, which is characterized in that the predetermined time is no less than interframe
Time away from PIFS.
15. error recovery method according to claim 14, which is characterized in that the predetermined time is distribution frame pitch
DIFS sends distribution frame pitch TxDIFS.
16. error recovery method according to claim 11, which is characterized in that the predetermined time is described true from sending
Time of frame is recognized to the time for receiving described access point and being sent to the frame of other websites.
17. a kind of access point apparatus, which is characterized in that including：
Sending module, within the current transmission chance TXOP times to the website transmission data for allowing access into TXOP battery saving modes
Frame, the data frame are used to indicate user data and are sent；
Retransmission module, if for not receiving the acknowledgement frame that the website is returned in response to the data frame, described current
The data frame is retransmitted to the website in the transmission opportunity TXOP times, does not need to compete new TXOP again.
18. access point apparatus according to claim 17, which is characterized in that the retransmission module includes：
First retransmission unit, if for the clear channel assessment result detected in the predetermined receiving time of the acknowledgement frame
Less than predetermined threshold, determine not receiving the acknowledgement frame, then retransmitted within the current transmission chance time to the website
The data frame；Or
Second retransmission unit, if for the clear channel assessment result detected in the predetermined receiving time of the acknowledgement frame
Not less than the predetermined threshold, when the frame decoding mistake received in the predetermined receiving time in the acknowledgement frame, determine do not have
The acknowledgement frame is received, then retransmits the data frame to the website within the current transmission chance time.
19. access point apparatus according to claim 17, which is characterized in that the retransmission module is used in current transmission machine
The data frame can be retransmitted to the website in predetermined time in time, wherein the station after the predetermined time
It clicks through into sleep state.
20. access point apparatus according to claim 17, which is characterized in that the retransmission module is used in current transmission machine
The data frame of pre-determined number can be retransmitted in time to the website.
21. access point apparatus according to claim 20, which is characterized in that the pre-determined number is 1 time.
22. a kind of site apparatus, which is characterized in that including：
First receiving module, for receiving the data frame that access point is sent, the data within the current transmission chance TXOP times
Frame is used to indicate user data and is sent；
Second receiving module, for being received in the current transmission chance time TXOP described in described access point retransmission
The data frame that data frame, wherein described access point retransmit is by described access point in the case where not receiving acknowledgement frame
It is sent in the current TXOP, the acknowledgement frame is receiving described access point transmission by the website for allowing access into TXOP battery saving modes
Data frame when return, do not need to compete new TXOP again.
23. site apparatus according to claim 22, which is characterized in that second receiving module includes：
First receiving unit if for the data frame decoding error, connects within the current transmission chance time described in reception
The data frame that access point retransmits；Or
Second receiving unit, if correct for the data frame decoding, to described access point send the acknowledgement frame it
Afterwards, the data frame that described access point retransmits is received in the predetermined time within the current transmission chance time, and in institute
The predetermined time is stated later into sleep state.
24. site apparatus according to claim 23, which is characterized in that the predetermined time is from the transmission acknowledgement frame
Time to the time for receiving described access point and being sent to the frame of other websites.
25. a kind of system for Fault recovery, which is characterized in that including access point apparatus and site apparatus, wherein：
Described access point equipment is used within the current transmission chance TXOP times to the station for allowing access into TXOP battery saving modes
Point device transmission data frame, the data frame are used to indicate user data and are sent；If the site apparatus is not received
In response to the acknowledgement frame that the data frame returns, sent out again to the site apparatus within the current transmission chance TXOP times
Send the data frame；
The site apparatus is used to receive within the current transmission chance TXOP times described in the transmission of described access point equipment
Data frame；The data frame that described access point equipment retransmits is received in the current transmission chance time TXOP, no
It needs to compete new TXOP again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410709969.6A CN104378184B (en) | 2011-06-21 | 2011-06-21 | Error recovery method, access point apparatus, site apparatus and its system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110167875.7A CN102843220B (en) | 2011-06-21 | 2011-06-21 | Error recovery method, access point equipment, station equipment and error recovery system |
| CN201410709969.6A CN104378184B (en) | 2011-06-21 | 2011-06-21 | Error recovery method, access point apparatus, site apparatus and its system |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110167875.7A Division CN102843220B (en) | 2011-06-21 | 2011-06-21 | Error recovery method, access point equipment, station equipment and error recovery system |
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| CN104378184A CN104378184A (en) | 2015-02-25 |
| CN104378184B true CN104378184B (en) | 2018-06-26 |
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| JP6748063B2 (en) * | 2015-02-26 | 2020-08-26 | シャープ株式会社 | Terminal device, base station device, communication method, and communication system |
| US10200162B2 (en) * | 2016-05-27 | 2019-02-05 | Qualcomm Incorporated | HARQ feedback in shared RF spectrum band |
| CN108306711B (en) * | 2018-01-02 | 2021-05-14 | 重庆邮电大学 | Data frame rapid continuous transmission method based on LoRa |
| JP2022542422A (en) * | 2019-07-30 | 2022-10-03 | サフラン パッセンジャー イノベーションズ， エルエルシー | System and method for smart broadcasting for multicast communication over IP-based TDMA networks |
| CN112134659B (en) * | 2020-09-16 | 2023-05-30 | 中国科学院国家空间科学中心 | Error recovery system supporting FDIR function |
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| CN101529824A (en) * | 2006-10-19 | 2009-09-09 | 高通股份有限公司 | Power save enhancements for wireless communication |
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| US8842657B2 (en) * | 2003-10-15 | 2014-09-23 | Qualcomm Incorporated | High speed media access control with legacy system interoperability |
| US20090031185A1 (en) * | 2007-07-23 | 2009-01-29 | Texas Instruments Incorporated | Hybrid arq systems and methods for packet-based networks |
| US8040983B2 (en) * | 2007-10-02 | 2011-10-18 | Intel Corporation | Device, system and method of mitigating interference in a wireless network |
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