CN103607755B - Wireless local area network communication channel control method based on frequency hopping - Google Patents
Wireless local area network communication channel control method based on frequency hopping Download PDFInfo
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- CN103607755B CN103607755B CN201310532904.4A CN201310532904A CN103607755B CN 103607755 B CN103607755 B CN 103607755B CN 201310532904 A CN201310532904 A CN 201310532904A CN 103607755 B CN103607755 B CN 103607755B
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Abstract
The invention discloses a wireless local area network communication channel control method based on frequency hopping. The method comprises the following steps that 1) a channel control unit scans a surrounding wireless local area network environment and selects channels to be controlled; 2) the channel control unit adopts a frequency hopping method to make working frequency points of a wireless network card skip circularly among the plurality of selected channels; the wireless network card sends a channel control signal on each selected channel and an time interval of the frequency hopping is less than communication connection establishment time of an access point AP in each channel and a communication terminal STA. According to the method of the invention, by using a frequency hopping technology, the single piece of wireless network card simultaneously and effectively control the plurality of wireless local area network communication channels; channel control efficiency of the wireless local area network communication is greatly increased; and mutual interferences generated during cooperation of the plurality of wireless network cards are solved; a solution scheme is provided for a multi-card system which implements 2.4GHz frequency-range wireless local area network full frequency range channel control, wherein the multi-card system is formed by the wireless network card with low performance.
Description
Technical field
The present invention relates to a kind of channel control method of WLAN, more particularly, to a kind of serial based on IEEE802.11
The channel control method of standard wireless local area networks 2.4GHz frequency range, improve to wireless LAN communication channel control efficiency and
Reliability, belongs to Wireless local area network security technology field.
Background technology
WLAN is by wireless network card（NIC）, wireless contact (AP), personal work platform（Station）And its
He forms the network equipment.PC or other equipment can be attached by wireless network card with wireless network, and WAP is
Multiple wireless access stations are aggregated on wired network.WLAN adopts electromagnetic wave as carrier, is using penetrating
Frequency technology carries out the open physical system of network connection and transmission, and this open nature determines it and providing networking just
While profit, also make it be difficult to the physical access of limit network resource, thus it than cable network in security performance more
Plus it is fragile.WLAN has mobility so that each node in mobile network does not have enough physical protections, attacker
May implement to attack by mobile device in any position, safety management difficulty is greatly it is necessary to adopt certain safety protection technique
Ensure application safety.
For common wireless network user, the use of wireless network need to take into account simultaneously portable, at a high speed, safety
Characteristic, the IDS being optimized for WLAN（Intrusion detection）Kind equipment is an important developing direction.For safety
The higher application scenario of security requirements, needs relatively reliable safe solution, typically all adopts the electromagnetism based on frequency sweep to do
Disturb technology, reach and all or selectively block wireless receiver (AP) or personal work platform in WLAN
(Station) wireless channel.
But currently for radio communication（Including WLAN）All deposited based on the electromagnetic interference insult mode of frequency sweep
In certain shortcoming, it is all the noise sources such as similar white noise to be carried out frequency spectrum processing and amplifies the interference of output due to be usually taken
Mode, its interference effect and interference unit send the field intensity positive correlation of signal, and that is, interference signal field intensity is bigger, and interference effect is better,
Conversely, then not reaching ideal effect.The signal strength that therefore interference unit sends needs the signal strength much larger than disturbed equipment,
Can be only achieved preferable barrier effect, but national electromagnetic radiation relevant regulations can not be violated, limited by interference distance.
Content of the invention
For technical problem present in prior art, it is an object of the invention to provide a kind of channel of WLAN
Control method.The present invention is a kind of channel controlling party for IEEE802.11 series standard WLAN 2.4GHz frequency range
Method, the method is based on frequency hopping and controls wireless network card to be jumped in WLAN 2.4GHz band communication interchannel with certain time slot
Interference is penetrated in forwarding, can control multiple WLAN 2.4GHz communication channels simultaneously, and effect is reliable.Existing compared with other
Method radio-frequency emission power is low, control range is big.
The technical scheme is that：
A kind of wireless LAN communication channel control method based on frequency hopping, its step is：
1）Radio local network environment around channel controller scanning, chooses channel to be controlled；
2）Channel controller adopts frequency-hopping method to control the working frequency points of wireless network card to circulate in selected multiple interchannels
Redirect；Wherein, this wireless network card sends a control signal channel on each selected channel, and the time interval of frequency hopping is less than channel
Middle access point AP and communication terminal STA communication connection setup time.
Further, the time interval of described wireless network card frequency hopping sends less than access point AP and builds for communication terminal STA
The time interval of the vertical broadcast transmission beacon frame connecting.
Further, described channel controller includes polylith wireless network card, and distributes one group for each wireless network card and treat
Control channel；Each wireless network card all controls its working frequency points in selected multiple interchannel cycling jumps using frequency-hopping method.
Further, described in described channel controller coordination polylith, the working frequency points of wireless network card redirect；I.e. when one piece
Described wireless network card sends one after having sent control signal channel and is sent information to described channel controller, described channel
Control unit receive all wireless network cards be sent signal after be uniformly controlled all wireless network cards and carry out channel hopping
And control network interface card launch channel control signal again.
Further, described channel controller controls each wireless network card to launch simultaneously, stops simultaneously, redirects channel simultaneously
Frequency.
Further, the time interval of described wireless network card frequency hopping is less than or equal to 10ms.
Further, described channel controller passes through bottom layer driving directly to described wireless according to predetermined time slot
The register of network interface card is configured, and the working frequency points realizing described wireless network card are in selected multiple interchannel cycling jumps.
Compared with prior art, the invention has the advantages that：
（1）The inventive method can make the monolithic wireless network card multiple WLAN of effective control simultaneously using frequency hopping
Communication channel, significantly improves the channel control efficiency of wireless LAN communication.
（2）When implementing to control to more wireless lan channel using polylith wireless network card collaborative work simultaneously, due to
The reason CSMA/CA mechanism, can produce between network interface card and interfere impact, lead to the part network interface card cannot normal transmission signal.This
Inventive method can solve polylith wireless network card work in coordination with when produce interfere, be to be made up of the relatively low wireless network card of performance
Multi-card system is implemented the control of 2.4GHz frequency range WLAN full frequency band channel and is provided solution.
Brief description
Fig. 1 is IEEE802.11 series standard 2.4GHz band channels figure；
Fig. 2 is single channel control effect schematic diagram；
Fig. 3 is hopping control channel course of work schematic diagram；
Fig. 4 is hopping control channel time slot schematic diagram；
Fig. 5 interferes schematic diagram for adjacent channel work network interface card；
Fig. 6 is uniformly controlled polylith network interface card collaborative work schematic diagram for control unit.
Specific embodiment
Technical scheme, from the channel rate-determining steps implementing one or more WLAN2.4GHz communication channels, is wrapped
Include the generation of control signal channel, channel frequency redirects, polylith channel controls network interface card to work in coordination with three parts.
（1）In order to play the purpose controlling WLAN 2.4GHz communication, need to produce particular channel control signal.Letter
The control signal in road can be produced by the standard radio network interface card implementing channel control.Control signal is to meet IEEE802.11 series
The meaningful frame signal of standard（Such as Beacon frame signal）, can effectively trigger the CSMA/CA (Carrier of WLAN
Sense Multiple Access with Collision Avoidance) mechanism, reach persistently take limited channel resources,
The purpose of control channel.
（2）IEEE802.11 series standard has 14 channels in 2.4GHz frequency range, and place frequency is from 2.412GHz-
2.484GHz, spaced 5MHz, channel width is 22MHz, as shown in Figure 1.Control letter in individual channel frequency launch channel
Number can control this channel communication, and also the proper communication of channel nearby can be affected.CSMA/CA machine due to WLAN
System employs the mode of energy measuring (ED), carrier wave detection (CS) and three kinds of detection channel idle of energy carrier wave hybrid detection.This
Plant impact to weaken rapidly with a distance from institute's control channel frequency.According to universal engineering experience, this kind of coverage is only wrapped
Include adjacent two channels of channel to be controlled, as shown in Figure 2.
（3）Due to using standard radio network interface card emission standard wireless lan signal as control signal channel, its bandwidth
Narrower, can only the single wireless lan channel of effective control.In order to only be controlled using monolithic network interface card or a small amount of network interface card simultaneously
Multiple wireless lan channels, the present invention is realized by the way of frequency hopping.Control the working frequency points of wireless network card in multiple letters
Road cycling jump, immediately hops to subsequent channels after the channel launch channel control signal that each needs enforcement to control, follows
Ring is reciprocal, reaches effectively block, using one piece of wireless network card, the purpose disturbing multiple channels simultaneously, and its process is as shown in Figure 3.No
Redirecting of gauze card working frequency points, is realized by a channel controller.This channel controller can be according to the predetermined time
Gap is directly configured to the register of wireless network card by bottom layer driving, thus being rapidly completed the jump of working channel frequency
Turn.
（4）Because wireless network card is when jumping to next channel frequency work, wireless office on originally controlled channel
Can reattempt between the net access point AP and communication terminal STA of domain to set up and connect it is therefore necessary to select appropriate time interval to enter
Row redirects, rebound control channel again before connection setup completes.Before access point AP and communication terminal STA sets up and connects,
Access point AP can send beacon frame with broadcast mode（beacon）Detect identification for communication terminal, communication terminal STA receives this
Next step will be consulted according to agreement with access point AP after beacon frame to communicate, wherein access point AP broadcast transmission beacon frame（beacon）
Time interval be 100ms, as shown in Figure 4.In addition consider multiple stage access point AP may be had to work on a channel, this time
Interval is reduced further, and the stepped-frequency interval selection 10ms magnitude of therefore wireless network card control channel is safer.This programme is adopted
Hopping time is spaced apart less than or equal to 10ms.
（5）Because the performance of different radio network interface card is different, its frequency hop rate and control signal channel is led to send speed
Rate produces difference.When needing whole 14 channels are controlled simultaneously, need polylith wireless network card collaborative work.This work
Under operation mode, each network interface card needs to send data on by control channel incessantly, with busy channel.Due to wireless network card chip
CCA be have cured on hardware（Clear Channel Assessment, i.e. clear channel assessment (CCA)）Function, this function makes physical layer
Judge the state of wireless medium according to certain condition, such as busy or idle, if CCA judges that channel is in " doing " state, then meeting
Postpone transmitting, wait for a period of time, launch again after channel idle, this results in and can produce interference between polylith network interface card.I.e. work
Make two network interface cards in adjacent channel, one of meeting triggers CCA because the control signal channel that another first sends is detected
Mechanism, thus postpone emission or non-emission, as shown in Figure 5.
The present invention is uniformly controlled polylith network interface card collaborative work by a control unit, makes polylith wireless network card simultaneously right
Answer transmitting interference blocker signal on channel, detailed process is：Inform that control is single after one piece of network interface card has sent control signal channel
Unit, control unit receive all network interface cards be sent signal after be uniformly controlled all network interface cards and carry out channel hopping and control
Network interface card launch channel control signal again, each wireless network card is launched simultaneously, stops simultaneously, redirects channel frequency simultaneously, thus real
The now unified collaborative work of many network interface cards and avoid disturbing between the network interface card that CCA mechanism causes.This process is as shown in Figure 6.In order to ensure
The concertedness of polylith network interface card work, control unit is directly configured to the corresponding registers of network interface card by bottom layer driving, effectively
Improve instruction response speed and reduce error rate.
Claims (6)
1. a kind of wireless LAN communication channel control method based on frequency hopping, its step is：
1) radio local network environment around channel controller scanning, chooses channel to be controlled；
2) channel controller adopts frequency-hopping method to control the working frequency points of wireless network card in selected multiple interchannel cycling jumps；
Wherein, this wireless network card sends a control signal channel on each selected channel, and the time interval of frequency hopping is less than in channel and connects
Access point AP and communication terminal STA communication connection setup time；
Wherein, described channel controller includes polylith wireless network card, and distributes one group of channel to be controlled for each wireless network card；
Each wireless network card all controls its working frequency points in selected multiple interchannel cycling jumps using frequency-hopping method.
2. the method for claim 1 is it is characterised in that the time interval of described wireless network card frequency hopping is less than access point AP
Send the time interval setting up the broadcast transmission beacon frame connecting for communication terminal STA.
3. the method for claim 1 is it is characterised in that described channel controller coordinates wireless network card described in polylith
Working frequency points redirect；After one piece of described wireless network card has sent control signal channel, send one be sent information to described
Channel controller, described channel controller receive all wireless network cards be sent signal after be uniformly controlled all
Wireless network card carries out channel hopping and controls network interface card launch channel control signal again.
4. method as claimed in claim 3 it is characterised in that described channel controller control each wireless network card launch simultaneously,
Stop simultaneously, redirect channel frequency simultaneously.
5. described method as arbitrary in Claims 1 to 4 it is characterised in that the time interval of described wireless network card frequency hopping be less than
Or it is equal to 10ms.
6. described method as arbitrary in Claims 1 to 4 it is characterised in that described channel controller according to the predetermined time between
Gap is directly configured to the register of described wireless network card by bottom layer driving, and the working frequency points realizing described wireless network card exist
Selected multiple interchannel cycling jump.
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| US9673921B1 (en) * | 2015-12-26 | 2017-06-06 | Intel IP Corporation | Wireless fidelity (Wi-Fi) clear channel assesment (CCA) detection and transmission decision making in a portable device |
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| CN101667849A (en) * | 2008-09-05 | 2010-03-10 | 华为技术有限公司 | Data transmission method, network equipment and communication system |
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| CN101667849A (en) * | 2008-09-05 | 2010-03-10 | 华为技术有限公司 | Data transmission method, network equipment and communication system |
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| 跳频技术的局域网安全应用分析;栗勇;《北京联合大学学报》;20041230;第4部分，图6-7 * |
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