CN108495328A - A method of enhancing Wireless LAN transmission reliability under WiFi interference - Google Patents
A method of enhancing Wireless LAN transmission reliability under WiFi interference Download PDFInfo
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- CN108495328A CN108495328A CN201810236127.1A CN201810236127A CN108495328A CN 108495328 A CN108495328 A CN 108495328A CN 201810236127 A CN201810236127 A CN 201810236127A CN 108495328 A CN108495328 A CN 108495328A
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention discloses a kind of methods of enhancing Wireless LAN transmission reliability under WiFi interference, include the following steps：WiFi interference environment in, for avoid with the collision problem of routine WiFi, introduce virtual carrier sense mechanism；Simultaneously on the basis of TDMA scheduling mechanisms, devise predetermined mechanisms in advance, if it is upper one scheduling link in number of retransmissions do not use all, remaining not used re-transmission time be scheduled in advance it is next will transmission data link；By the way that still not used re-transmission time in the link of transmission success is scheduled to next link that will be dispatched in advance, increase next transmission time that will dispatch link, to improve the reliability of data transmission；Shorten the interframe space IFS of TDMA networks simultaneously to improve the priority of TDMA networks, such TDMA networks there can be the transmission of the advanced row data of higher chance than common WiFi network.
Description
Technical field
The present invention relates to wireless communication transmission techniques more particularly to a kind of enhancing Wireless LAN to be passed under WiFi interference
The method of defeated reliability.
Background technology
Radio network technique is because of its ambulant huge advantage, it is easier to deployment and reduction maintenance and deployment cost.
But existing CSMA/CA mechanism, uncertain delay can not provide reliable data packet in real time and deliver, and most cases
Lower channel condition is in ceaselessly dynamic change.The reliability of data transmission how is improved to reduce general how according to concrete application
The interference of logical WiFi, the reliability for improving Wireless LAN data transmission have great research significance.
Invention content
It is an object of the invention to for present research hotspot --- on the basis of TDMA scheduling mechanisms, for
Collision with common WiFi how is avoided the problem that in the environment of WiFi interference, provides a kind of enhancing Wireless LAN in WiFi
The method of the lower transmission reliability of interference, on the basis of the real-time Data Transmission of TDMA link schedulings, using TDMA Network Priorities
The mechanism of transmission, while sharing not used bandwidth and arriving conventional WiFi network, and by virtual carrier sense mechanism, avoid and
The collision of common WiFi, improves the handling capacity of Radio Link.
The purpose of the present invention is achieved through the following technical solutions：A kind of enhancing Wireless LAN is interfered in WiFi
The method of lower transmission reliability, this approach includes the following steps：
The first step：It is installed in Ath9k and opens virtual carrier sensing in wireless network communication；
Second step：TDMA link scheduling components are built in Ath9k, include the timer mould dispatched for trigger link
Block, the communication link scheduler module for the station arrangement dispatching sequence to access, the channel access control for managing the station accessed
Molding block；
Third walks：Link scheduling superframe is built, uplink and downlink link scheduling is distributed for each station, in scheduling repeating query every time
Beginning, send beacon frame in first time slot A P, synchronized for length of a game；
4th step：Addition shifts to an earlier date predetermined mechanisms in communication link scheduler module, specifically, if number of retransmissions is not complete
Portion use, remaining not used re-transmission time be scheduled in advance it is next will transmission data link；
5th step：Shorten interframe space IFS：For the short IFS of TDMA node distribution ratio routines WiFi, dispatched with giving TDMA
The higher priority of node visit channel of mechanism so that TDMA nodes start to transmit earlier than conventional WiFi nodes；
6th step：Not used bandwidth is shared with conventional WiFi network：Bandwidth sharing mechanism is used by protection frame and channel
Estimation composition；Protection needle broadcasts NAV in the network of TDMA scheduling mechanisms and goes to postpone the transmission of conventional WiFi；Channel uses estimation
The channel access time of past routine WiFi flows is measured by recording, and estimates to access by using exponent-weighted average
Time；Assuming that the channel access time Estimate for conventional WiFi is tEst, and it is t to protect frame transmission timeGuardFrame, fixed
The shared threshold time t of justiceSharedIt is as follows：
tShared=tEst+tGuardFrame
If idle time of channel is less than tShared, the data transmission under TDMA mechanism is protected using virtual carrier sensing in wireless network communication；
If idle time of channel is in communication scheduling more than tShared, dispatch a protection needle and by the not used channel idle of institute
Time shares to conventional WiFi.
Further, in the first step, the AR_DIAG_SW and AR_D_ of the hardware register by manipulating AR9285
GBL_IFS_MISC opens its carrier sense.
Further, in the third step, wifi signals are discharged by hostapd, isc-dhcp-server is to access
Station distribute IP address；It stands after successful connection, channel access control module will build new superframe；Link scheduling module is control
The dispatching sequence to the station in superframe is made, primary new cycle is being carried out after scheduling；Timer module is each for triggering
The beginning of time slot；One superframe is made of many time slots, and in the beginning of poll each time, first time slot is that AP sends beacon
Frame, for the synchronization in length of a game.
Further, in the 4th step, when link reserves transmission opportunity three times in primary scheduling, in this machine three times
In meeting, it is possible to for the first time with regard to transmission success, or transmission failure for the first time, the transmission success in second of re-transmission, or
Person is preceding transmission failures twice, and third time is needed to retransmit at this time；One effective mechanism is set, for detecting first link L1
Last time retry whether chain uses, specially：Third mini-slot is subscribed in advance, in first link L1It does not use most
When once retrying chance afterwards, next Article 2 link L that will be sent is allowed2Directly in first link L1Third time retry
It is sent in advance in chance, in addition, booking mechanism is still necessary to ensure that L in advance1And L2Meet the requirement of their reliability；For
L1, always transmitted if necessary since third time retransmits, reliability meets L1Requirement；In addition, only third time mini-slot not
Send L1Third time transmission when just can be with forward scheduling L2, therefore, L1And L2Can it is anticipated that reliability adjusted
Degree.
Further, in the 6th step, virtual carrier sensing in wireless network communication is flexibly used to solve transmission resistance in conventional WiFi network
It fills in, during virtual carrier sensing in wireless network communication, link blocks wifi network by using NAV, but in the long-time of NAV, is not used
NAV long channel free times waste the shared chance with routine WiFi transmission, by the mechanism of protection TDMA flows and make
Conventional WiFi network shares not used bandwidth and solves the problems, such as this.
The beneficial effects of the invention are as follows：The invention discloses one kind under TDMA scheduling mechanisms, dry in common WiFi signal
Disturb the lower method for improving Wireless LAN data transmission credibility.The present invention is directed to and how to be avoided in the environment that WiFi is interfered
The problem of with the collision of common WiFi, introduce virtual carrier sense mechanism；The base of chain is retried in rate adaptation export simultaneously
On plinth, predetermined mechanisms in advance are devised, if number of retransmissions does not use all, remaining not used re-transmission time is shifted to an earlier date
Be scheduled to it is next will transmission data link；By the way that still not used re-transmission time in the link of transmission success is carried
Before be scheduled to next link that will be dispatched, increase next transmission time that will dispatch link, passed to improve data
Defeated reliability；Shorten the interframe space IFS of TDMA networks simultaneously to improve the priority of TDMA networks, such TDMA networks can
To there is the transmission of the advanced row data of higher chance than common WiFi network；The present invention is avoided by introducing virtual carrier sensing in wireless network communication
The collision of common WiFi network, the priority of TDMA networks, Yi Jiti are improved by shortening the interframe space IFS of TDMA networks
A kind of predetermined and bandwidth sharing mechanism in advance is gone out.
Description of the drawings
Fig. 1 is TDMA link scheduling modules；
Fig. 2 is the overall architecture of TDMA scheduling mechanisms；
Fig. 3 is the design drawing of time slot；
In Fig. 4, (a) is (b) to be the link scheduling shifted to an earlier date under predetermined mechanisms without scheduled link scheduling in advance；
Fig. 5 is TDMA networks and coexisting under common WiFi network different mode, and (a) is original coexistance model, is (b)
Coexistance model under virtual carrier sensing in wireless network communication is (c) coexistance model under bandwidth sharing.
Specific implementation mode
In order to make the above and other objects, features and advantages of the present invention more obvious, will hereafter make further details of
Explanation.
As shown in Figure 1, TDMA link schedulings component mainly has three big modules, channel access control module is for access
It stands, wifi signals is discharged by hostapd, isc-dhcp-server distributes IP address to the station of access；It stands successful connection
Afterwards, channel access control module will build new superframe；Link scheduling module is the dispatching sequence controlled to the station in superframe,
Primary new cycle is being carried out after scheduling；Timer module is used to trigger the beginning of each time slot；One superframe has very much
Time slot forms, and in the beginning of poll each time, first time slot is that AP sends beacon frame, for the synchronization in length of a game, such as
Shown in table 1.
Table 1 has a superframe of 7 time slot examples
Fig. 2 show whole software architecture, the i.e. software at the ends AP and the TDMA scheduling mechanism network management frameworks at station end
Framework, this design are built upon on (SuSE) Linux OS and use 802.11 compatible hardwares of IEEE.It is tight in order to meet TDMA
The time restriction of lattice develops MAC module and rate adaptation control module in TDMA scheduling mechanisms in linux kernel.
For the existing system design of compatibility, existing two kernel moulds in the Governance framework and kernel spacing of TDMA scheduling mechanisms are incorporated
Block (MAC of mac80211 and hardware-dependent).Mac80211 is an inner core managing module, for managing IEEE in linux
Media access control sublayer entity and the MAC kernel modules of hardware-dependent are for handling specific radio network interface driving in 802.11 agreements
Program.In addition to changing existing kernel module, we develop a configurable TDMA data link layer in kernel.At this
There are two types of the message flows of type in network management framework.Black solid line in Fig. 2 is represented through internal interface in TDMA mechanism
The inside story exchanged in the ends AP or station end.Dotted line is shown in different machines and transmits the communication information.For inside story, net
Network socket is used for the communication of user space program and kernel module.Message is transmitted on different machines then uses TCP
Or udp protocol is transmitted.
As shown in figure 3, the WiFi network of TDMA scheduling mechanisms has stringent timing requirements to each equipment.For example, such as
If fruit needs total sampling rate to be 2kHz, the every 500 μ s of timer need to deliver accurate timing interruption, all relevant with the sample
Task (including data transmission, confirm and possible time slot retransmits) should be completed in its time slot.Time slot is TDMA scheduling mechanism nets
One basic provisional channel access unit of network.Certainty sequential behavior, each TDMA scheduling mechanisms are provided for each target
In node can only its predistribution time slot in access channel.The time slot of TDMA scheduling mechanisms is illustrated in Fig. 3 (a), when
Gap size is determining by formula (1), protection interval (TGuardInterval) inaccurate due to synchronizing when continuous data transmission for ensuring
Really interfering with each other for generation, starts data transmission, transmission time (T after protection intervalData) depend on transmission rate and packet
Size.After recipient is successfully received data, it will be rung after short interFrameGap (SIFS) with (ACK) message
It answers.If sender does not receive ACK after short interFrameGap (SIFS), sender is assumed by the packet loss.
TTimeSlot≥TGuardInterval+TData+TSIFS+TACK (1)
TDMA scheduling mechanism application retransmission mechanism improves the reliability of communication link.This retransmission mechanism is known as in time slot
It retries：Retransmission mechanism is shown in Fig. 3 (b) in time slot.If sender does not receive the ACK message from recipient immediately
It retransmits.The length of time slot is not to be exceeded in re-transmission time in time slot.
Chance is retried three times it is assumed that each existing in scheduling link, the probability of each transmission success is 0.5,
Show that we cannot dispatch two links simultaneously in Fig. 4 (a).However, observing L in Fig. 4 (a)1Use last time weight
The probability of examination only has 0.25, because if L1The first two, which retries all to fail, can just use third time to retry.There are one so if
Effective mechanism can detect L1Last time retry whether chain uses, as shown in Fig. 4 (b), when we can subscribe micro- in advance
Gap 3 so that only send T(2,1)If T(1,3)In the case of there is no use in mini-slot.In addition, booking mechanism still needs in advance
Ensure L1And L2Still meet the requirement of their reliability.For L1, due to T(1,3)Always it is necessary to when transmit, reliably
Property meets L1Requirement.In addition, only not sending T in mini-slot 3(1,3)Shi Caike is with forward scheduling L2, L2The successful transmission of grouping
Rate calculates as follows：0.75·E({T(2,1),T(2,2),T(2,3)})+0.25·E({T(2,1),T(2,2))=0.750.875+
0.250.75=0.84375.Therefore, L1And L2Can it is anticipated that reliability be scheduled.
Carrier sensing method is as shown such as (a) in Fig. 5, because old coexistance model cannot postpone common WiFi transmission, it is sad
The transmission of estimation routine WiFi in the worst cases is seen, that is, assumes that WiFi uses maximum transmission unit and minimum data rate.Cause
This, this method causes inefficient channel to use.It on the other hand, can be in virtual carrier sense mechanism as shown in (b) in Fig. 5
Under dispatch link 2 immediately after the deadline date of link 1.The transmission of link 2 will not be by conventional WiFi transmission blockings, i.e.,
Make link 1 do not use it is all retry chain because common WiFi will be postponed to the end of specified NAV.In Fig. 5
(c), if idle time of channel is less than tShared, we protect the data transmission under TDMA mechanism using virtual carrier sensing in wireless network communication.
On the other hand, if channel free time is more than shared threshold value in our communication scheduling, we dispatch a protection needle simultaneously
And the not used idle time of channel of institute is shared into conventional WiFi.Note that since retention time is to protection frame and from conventional
The channel access of WiFi, in this way if estimation is accurate, TDMA transmission will not be delayed by.However, if TDMA
Transmission misses deadline, due to underestimating the channel access time, system can adaptive updates channel estimation and structure it is new
Communication schedule.
The present invention is not only limited to above-mentioned specific implementation mode, and persons skilled in the art are according to disclosed by the invention interior
Hold, other a variety of specific embodiments may be used and implement the present invention.Therefore, every design structure using the present invention and think of
Road does some simple designs changed or change, both falls within the scope of the present invention.
Claims (5)
1. a kind of method of enhancing Wireless LAN transmission reliability under WiFi interference, which is characterized in that this method includes
Following steps：
The first step：It is installed in Ath9k and opens virtual carrier sensing in wireless network communication；
Second step：TDMA link scheduling components are built in Ath9k, include timer module, the use dispatched for trigger link
Mould is controlled in the communication link scheduler module of the station arrangement dispatching sequence to access, for managing the channel access at the station accessed
Block；
Third walks：Link scheduling superframe is built, uplink and downlink link scheduling is distributed for each station, in opening for scheduling repeating query every time
Begin, sends beacon frame in first time slot A P, synchronized for length of a game；
4th step：Addition shifts to an earlier date predetermined mechanisms in communication link scheduler module, specifically, if number of retransmissions does not make all
With, remaining not used re-transmission time be scheduled in advance it is next will transmission data link；
5th step：Shorten interframe space IFS：For the short IFS of TDMA node distribution ratio routines WiFi, to give TDMA scheduling mechanisms
The higher priority of node visit channel so that TDMA nodes start to transmit earlier than conventional WiFi nodes；
6th step：Not used bandwidth is shared with conventional WiFi network：Bandwidth sharing mechanism uses estimation by protection frame and channel
Composition；Protection needle broadcasts NAV in the network of TDMA scheduling mechanisms and goes to postpone the transmission of conventional WiFi；Channel is passed through using estimation
Record measures the channel access time of past routine WiFi flows, and by using exponent-weighted average come when estimating to access
Between；Assuming that the channel access time Estimate for conventional WiFi is tEst, and it is t to protect frame transmission timeGuardFrame, definition
Shared threshold time tSharedIt is as follows：
tShared=tEst+tGuardFrame
If idle time of channel is less than tShared, the data transmission under TDMA mechanism is protected using virtual carrier sensing in wireless network communication；If
Idle time of channel is in communication scheduling more than tShared, dispatch a protection needle and by the not used idle time of channel of institute
Share to conventional WiFi.
2. a kind of method of enhancing Wireless LAN transmission reliability under WiFi interference according to claim 1,
It is characterized in that, in the first step, the AR_DIAG_SW and AR_D_GBL_IFS_ of the hardware register by manipulating AR9285
MISC opens its carrier sense.
3. a kind of method of enhancing Wireless LAN transmission reliability under WiFi interference according to claim 1,
It is characterized in that, in the third step, wifi signals is discharged by hostapd, isc-dhcp-server distributes the station of access
IP address；It stands after successful connection, channel access control module will build new superframe；Link scheduling module is control to superframe
In station dispatching sequence, carrying out primary new cycle after scheduling；Timer module is for triggering opening for each time slot
Begin；One superframe is made of many time slots, and in the beginning of poll each time, first time slot is that AP sends beacon frame, for complete
The temporal synchronization of office.
4. a kind of method of enhancing Wireless LAN transmission reliability under WiFi interference according to claim 1,
It is characterized in that, in the 4th step, when link reserves transmission opportunity three times in primary scheduling, in this three times chance,
It is possible that for the first time with regard to transmission success, or transmission failure for the first time, transmission success or preceding two in being retransmitted at second
Secondary all transmission failure, needs third time to retransmit at this time；One effective mechanism is set, for detecting first link L1Last
It is secondary to retry whether chain uses, specially：Third mini-slot is subscribed in advance, in first link L1Not using last time weight
Test-run a machine can when, allow next Article 2 link L that will be sent2Directly in first link L1Third time retry in chance and carry
Preceding transmission, in addition, booking mechanism is still necessary to ensure that L in advance1And L2Meet the requirement of their reliability；For L1, due to
It retransmits and always transmits if necessary three times, reliability meets L1Requirement；In addition, only not sending L in third time mini-slot1's
Third time just can be with forward scheduling L when transmitting2, therefore, L1And L2Can it is anticipated that reliability be scheduled.
5. a kind of method of enhancing Wireless LAN transmission reliability under WiFi interference according to claim 1,
It is characterized in that, in the 6th step, flexibly uses virtual carrier sensing in wireless network communication to solve transmission blocking in conventional WiFi network, it is virtual to carry
During wave is intercepted, link blocks wifi network by using NAV, but in the long-time of NAV, not used NAV long letters
Road free time wastes the shared chance with routine WiFi transmission, by protecting the mechanism of TDMA flows and making conventional WiFi nets
Network shares not used bandwidth and solves the problems, such as this.
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Cited By (1)
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| CN112383884A (en) * | 2020-11-25 | 2021-02-19 | 海南大学 | A secure MAC protocol initiated by a receiver |
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