CN103117833A - Shielding device and shielding method of wireless local area network - Google Patents
Shielding device and shielding method of wireless local area network Download PDFInfo
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- CN103117833A CN103117833A CN2012105171549A CN201210517154A CN103117833A CN 103117833 A CN103117833 A CN 103117833A CN 2012105171549 A CN2012105171549 A CN 2012105171549A CN 201210517154 A CN201210517154 A CN 201210517154A CN 103117833 A CN103117833 A CN 103117833A
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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
The invention discloses a shielding device of a wireless local area network, and simultaneously discloses a method for shielding interference of the shielding device of the wireless local area network. The shielding device of the wireless local area network comprises antennas, a receiving radio frequency module, a sweep frequency module, a coarse synchronization module, an interference data generation module, an emitting radio frequency module and a power amplifier. After frequency points, bandwidth and a standard which are used in the present wireless local network are determined by the sweep frequency module through frequency sweeping, the coarse synchronization module triggers interference signals to be generated to interfere long training sequences and SIGNAL fields in data frames, normal receiving of a receiving end is affected, and the purposes of shielding and interfering are achieved. The long training sequences and the SIGNAL fields in the data frames are affected by double interference, so that the shielding device and the shielding method of the wireless local area network have the advantages of being good in interference effects, large in actuating range and small in power consumption.
Description
Technical field
The present invention relates to a kind of WLAN (wireless local area network) shielding device and screen method, relate in particular to and a kind ofly disturb by long training sequence and SIGNAL field to Frame, realize WLAN (wireless local area network) shielding device and the screen method of shield effectiveness, belong to wireless communication technology field.
Background technology
WLAN (wireless local area network) (Wireless Local Area Network, WLAN) is replenishing of fixed broadband data network and extends.The user only need install wireless network card on computers, can realize high speed Internet access in the WLAN (wireless local area network) coverage.Current, the development of WLAN (wireless local area network) is very rapid, not only as the network access of office, family's first-selection, and on the airport, the public arena such as conference and exhibition center, hotel completed partial coverage.It and 3G, 4G network replenish mutually, and service on net easily at a high speed can be provided.
Radio communication has proposed new challenge also for communication security and security work when bringing convenience to people.In recent years, in China, a lot of malfeasances such as WLAN (wireless local area network) is eavesdropped, divulged a secret, examination hall cheating that utilize have occured, its extent of injury and seriousness have caused the great attention of relevant department.Therefore, in suitable place, legal and necessary shielding is implemented in the proper communication of WLAN (wireless local area network), become exigence in practice.
In application number was 201210059557.3 Chinese patent application, a kind of Full-band examination place radio signal shielding device was disclosed.This shielding device comprises fundamental frequency signal generator, modulation signal generator, modulator, frequency hopping generator, digital frequency converter and radio frequency unit.In this technical scheme, provide the low side interference signal by the fundamental frequency source, obtain the different frequency range signal by the saltus step difference frequency, thereby realize the shielding to all frequency ranges.This technical scheme is for mode and the technical conditions of present radio communication, can implement comprehensive, full frequency band, seamless blanket type cover jamming to the frequency range in 50MHz～2500MHz scope, effectively stops the cheating that all utilize wireless means.
In addition, in application number is 201010604926.3 Chinese patent application, disclose a kind of energy-conservation WLAN (wireless local area network) all-channel screen method, having comprised: started the channel of shielding device Wlan scanning, be recorded in the maximum of each working channel RSSI; Calculate the radio transmission loss PL of shielding device end communication equipment end of RSSI maximum to each channel; The shielding device of determining to be operated on the i channel makes the throughput of j channel reduce to zero minimum emissive power Y
ijFind out shielding device Y when being operated in different channels
ijMaximum, and therefrom find out minimum value Y
k, corresponding channel k is the best effort channel of shielding device; The working channel of shielding device is set as k, with Y
kThe power emission shielded signal.This technical scheme is disturbed simultaneously to whole channels, guarantees that channel throughput reduces simultaneously, avoided channel hopping to cause former channel throughput to go up and redirect during can not launch the problem of interference signal, improved jamming effectiveness.
At present, realizing the mode of WLAN (wireless local area network) shielding in prior art, is to utilize radio frequency to launch continuously interference signal in suitable frequency range basically, and the signal interference ratio of WLAN (wireless local area network) receiving terminal is reduced, and improves the frame error rate when receiving; And reduce the probability of WLAN (wireless local area network) transmitting terminal successful execution clear channel assessment (CCA), make it outwards send the rate reduction of frame.Comparatively speaking, the power dissipation ratio that continues the emission interference signal in prior art is larger, and interference effect has much room for improvement.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved by this invention is to provide a kind of WLAN (wireless local area network) shielding device and screen method.This technical scheme can make WAP (wireless access point) in predetermined coverage and the website can not proper communication, realizes shielding and the effect of disturbing.
For realizing the purpose of foregoing invention, the technical solution adopted in the present invention is as follows:
A kind of WLAN (wireless local area network) shielding device is characterized in that:
Described WLAN (wireless local area network) shielding device comprises antenna, received RF module, frequency sweep module, thick synchronization module, interfering data generation module, emission radio-frequency module and power amplifier;
Described received RF module connects described antenna on the one hand, connects respectively on the other hand described frequency sweep module and described thick synchronization module;
The output of described thick synchronization module connects respectively described interfering data generation module, described emission radio-frequency module and described power amplifier; Described interfering data generation module is connected with described power amplifier by described emission radio-frequency module; The output of described power amplifier is connected with described antenna.
Wherein more preferably, carry out frequency sweep in described frequency sweep module, after finding the information of current wireless local area network (LAN), the frequency of the resident frequency sweep of received RF module, described thick synchronization module search short training sequence; In case described thick synchronization module searches described short training sequence, trigger described interfering data generation module, described emission radio-frequency module and described power amplifier, the emission interference signal.
Wherein more preferably, described interference signal is implemented to disturb for long training sequence and the SIGNAL field (comprising SIGNAL/L-SIG field, HT-SIG field and VHT-SIG A field) of frame head in Frame.
A kind of WLAN (wireless local area network) screen method is realized based on above-mentioned WLAN (wireless local area network) shielding device, it is characterized in that:
The frequency sweep module is carried out frequency sweep to the current wireless local area network (LAN), after determining the information of current wireless local area network (LAN), and the frequency of the resident scanning of received RF module;
Described thick synchronization module is at current resident frequency, Frame is carried out the identification of short training sequence, in case described thick synchronization module searches described short training sequence, trigger described interfering data generation module, described emission radio-frequency module and described power amplifier, the emission interference signal;
Described interference signal is implemented to disturb for long training sequence and the SIGNAL field of frame head in Frame, makes receiving terminal can not identify the information that comprises in long training sequence and SIGNAL field, realizes the shielding of current wireless local area network (LAN) is disturbed.
Wherein more preferably, in the situation that described short training sequence is not identified by described thick synchronization module, described interfering data generation module, described emission radio-frequency module and described power amplifier are in holding state, there is no the interference signal emission.
Wherein more preferably, described interference signal has identical bandwidth with disturbed signal.
Wherein more preferably, for the Frame of IEEE 802.11n standard, described interference signal is implemented to disturb for wherein long training sequence, L-SIG field and HT-SIG field.
Wherein more preferably, for the Frame of IEEE 802.11ac standard, described interference signal is implemented to disturb for wherein long training sequence, L-SIG field and VHT-SIG-A field.
Wherein more preferably, length launch time of described interference signal is adjusted according to communication standard and signal bandwidth.
The present invention has following technical characterstic:
1. long training sequence and the SIGNAL field of Frame are carried out dual interference, have advantages of that interference effect is good, sphere of action is large;
2. do not need to continue the emission interference signal, have advantages of that power consumption is little;
3. screen method is simple, and the cost of facilities and equipments is lower.
Description of drawings
Fig. 1 is the module composition schematic diagram of WLAN (wireless local area network) shielding device provided by the present invention;
Fig. 2 is the substandard data frame format schematic diagram of IEEE 802.11a/g;
Fig. 3 is SIGNAl(L-SIG) the Bit Allocation in Discrete form schematic diagram of field;
Fig. 4 is the substandard data frame format schematic diagram of IEEE 802.11n;
Fig. 5 is the substandard data frame format schematic diagram of IEEE 802.11ac;
Fig. 6 is the Bit Allocation in Discrete form schematic diagram of Medium Access Control (MAC) Protocol Data Unit;
Fig. 7 is the Frame transmitting-receiving schematic flow sheet of MAC layer;
Fig. 8 is under IEEE 802.11a/g standard, the schematic diagram of interference signal;
Fig. 9 is under IEEE 802.11n standard, the schematic diagram of interference signal;
Figure 10 is under IEEE 802.11ac standard, the schematic diagram of interference signal.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
The invention provides a kind of WLAN (wireless local area network) shielding device, also provide this WLAN (wireless local area network) shielding device to realize the method for net mask simultaneously.This equipment and method are applicable to adopt the WLAN (wireless local area network) of IEEE802.11a/g/n/ac standard, have therefore covered current all popular WLAN standard.in the present invention, for the wireless local net data frame that adopts I EEE 802.11a/g/n/ac standard, by after the short training sequence (short trainingsymbols) of frame head identified and being located, further long training sequence (long trainingsymbols) and SIGNAL field are implemented to disturb, make receiving terminal can not identify the information that comprises in long training sequence and SIGNAL field, thereby make WAP (wireless access point) (the Access Point in WLAN (wireless local area network) shielding device coverage, be abbreviated as AP) and website (Station) can not proper communication, realization shields the purpose of interference to the proper communication in WLAN (wireless local area network).
Fig. 1 is the module composition schematic diagram of WLAN (wireless local area network) shielding device provided by the present invention.This WLAN (wireless local area network) shielding device mainly comprises antenna, received RF module, frequency sweep module, thick synchronization module, interfering data generation module, emission radio-frequency module and power amplifier.Wherein, antenna connects the input of received RF module, and the output of received RF module is connected respectively with thick synchronization module with scan module.The output of thick synchronization module is connecting respectively interfering data generation module, emission radio-frequency module and power amplifier.The interfering data generation module is connected with power amplifier by the emission radio-frequency module.The output of power amplifier is connecting antenna.The interference signal of emission is gone out by antenna transmission.Above-mentioned received RF module, frequency sweep module, thick synchronization module, interfering data generation module, emission radio-frequency module and power amplifier can adopt existing ripe integrated circuit (IC) chip to realize, also can be at the FPGA(field programmable gate array) be achieved by programming on the basis.Routine techniques as those skilled in the art can grasp does not just describe in detail at this.
In WLAN (wireless local area network) shielding device shown in Figure 1, the received RF module is by the wireless signal of antenna reception place WLAN (wireless local area network).The frequency sweep module is carried out frequency sweep to the WLAN (wireless local area network) of the current in-scope that the reception radio-frequency module searches.In the frequency sweep process, the frequency sweep module need to be determined the information such as network standard, frequency and bandwidth of current wireless local area network (LAN).If current network standard, frequency and bandwidth information are determined, the WLAN (wireless local area network) shielding device directly can carry out the setting of relevant information to the WLAN (wireless local area network) of required interference, need not to carry out frequency sweep to determine the relevant information of WLAN (wireless local area network) through the frequency sweep module again.For the network of the unknown, the frequency sweep module is carried out the frequency sweep analysis by the current wireless local area network signal that the reception radio-frequency module is received, and determines the information such as network standard, frequency and bandwidth of current wireless local area network (LAN).After the information of current wireless local area network (LAN) was determined, the received RF module was carried out resident at current scanning frequency.
Shielding jamming program of the present invention carries out mainly for the physical layer of WLAN (wireless local area network).Be described as follows:
In IEEE 802.11a/g standard, physical layer adopts the OFDM technology, can use 5MHz, 10MHz and 20MHz bandwidth.At first the physical layer of transmitting terminal is carried out scrambling, coding, is punched, interweaves, adds pilot bits and inverse fast fourier transform (IFFT) Medium Access Control (MAC) Protocol Data Unit (MPDU), then at known training sequence and the SIGNAL field composition data frame of data front interpolation receiving terminal.The frame format of this Frame as shown in Figure 2, is at first 10 short training sequence t1～t10, is next 2 long training sequence T1 and T 2, then is the SIGNAL field, and be data division at last.All comprise Cyclic Prefix (Cyclic Prefix) in long training sequence, SIGNAL field and data division.The SIGNAL field has 24 bits, comprised the information such as the modulation system of these frame data part and data length.Its concrete Bit Allocation in Discrete form as shown in Figure 3.
The IEEE802.11n standard adopts the OFDM technology equally, and can use 20MHz and 40MHz bandwidth.As shown in Figure 4, frame format in IEEE 802.11n standard is similar to the frame format in IEEE 802.11a/g standard, and is wherein identical in the form of short training sequence, long training sequence and SIGNAL field (referred to herein as the L-SIG field) and effect and IEEE 802.11a/g standard.But increased HT-SIG(high-throughput SIGNAL in this Frame) field.In the HT-SIG field that increases, further comprised the information such as modulation system, bandwidth, length, diversity mode, have 48 bits.
IEEE 802.11ac standard also adopts the OFDM technology, uses 20MHz, 40MHz, 80MHz, 80+80MHz and 160MHz bandwidth.As shown in Figure 5, frame format in IEEE 802.11ac standard is similar to the frame format in IEEE 802.11a/g standard, and is wherein identical in the form of short training sequence, long training sequence and SIGNAL field (referred to herein as the L-SIG field) and effect and IEEE802.11a/g standard.But increased VHT-SIG A(ultra-high throughput SIGNAL field A in this Frame) and VHT-SIGB(ultra-high throughput SIGNAL B) field.In the VHT-SIG A field that increases, further comprised bandwidth, diversity mode, sets of numbers, each user's the information such as spatial flow number, have 48 bits.
Therefore, disturb for the shielding of IEEE 802.11n standard and IEEE 802.11ac standard, except aforesaid long training sequence and SIGNAL(L-SIG) field, also need to comprise HT-SIG field and VHT-SIG A field.
In the physical layer of receiving terminal, complete automatic gain by the short training sequence of Frame and control (Automatic Gain Control), thick time synchronized and Frequency Synchronization; By long training sequence deadline, frequency precise synchronization and channel estimating.Then separate SIGNAL(L-SIG according to time, Frequency Synchronization value and channel estimation value) field is (in IEEE 802.11n and IEEE802.11ac, also comprise HT-SIG field and VHT-SIG A, B field), obtain the information such as the modulation system of follow-up data and data length, resolve follow-up data according to all these indications again, the MPDU that parses is delivered to the MAC layer.Can not correctly be parsed as the information in the SIGNAL field, receiving terminal can not correctly parse follow-up data, and these frame data will be dropped.
In WLAN (wireless local area network), the MAC layer is delivered to physical layer after formation MPDU after the MSDU packet is added the MAC head and tail.The form of MPDU wherein comprises the information such as frame control information, length, source address, destination address in the MAC head as shown in Figure 6, judges for receiving terminal whether this frame is the data that send to this receiving terminal; Whether the MAC tail comprises 32 bit frame checking datas (Frame CheckSequence, FCS), detect these frame data for receiving terminal and be correctly received, if incorrect reception abandons this frame.For the Frame that transmitting terminal sends, after the MAC of receiving terminal layer correctly receives parsing, need to wait for SIFS(ShortInter-Frame Space after data receiver finishes) time, then send the ACK frame to confirm the correct reception of this Frame to transmitting terminal.After transmitting terminal receives the ACK frame, confirm that namely this Frame correctly receives, the transmission of the next Frame of beginning, detailed process is as shown in Figure 7.If transmitting terminal is at the SIFS that send to finish after the time, correctly do not receive the ACK frame, transmitting terminal thinks that the Frame that sends has occured to conflict with the Frame that other website sends so, be not correctly received, therefore in the scope of competition window, random select a rollback time, resend again this Frame when reaching the value of rollback time etc. channel idle.After if the Frame number of retransmissions has surpassed maximum retransmission, still do not send successfully, this Frame will be dropped so.This communication mechanism is used to realize the shielding of WLAN (wireless local area network) proper communication is disturbed by the present invention.
In WLAN (wireless local area network) shielding device shown in Figure 1, thick synchronization module is mainly used in identification, the monitoring to the frame head short training sequence.For the RM of frame head, can identify according to the correlation of each pattern according to existing technology.Although the frame format of heterogeneous networks standard is different, wherein the form of short training sequence and shared bit are identical, and therefore mode and the time of identification are also identical.At the resident current frequency of frequency sweep module, the short training sequence of frame head in thick synchronization module search current wireless lan data frame.In case thick synchronization module searches short training sequence, namely thinking has Frame to send, and triggers at once interfering data generation module, emission radio-frequency module and power amplifier, and emission is the interference signal of correspondence with it.In the situation that in Frame, the short training sequence of frame head is not by thick synchronization module identification, interfering data generation module, emission radio-frequency module and power amplifier are in the state of standby, there is no the interference signal emission.Continue the WLAN (wireless local area network) shielding device of emission interference signal for needs, the emission to interference signal in the present invention is adaptive, and power consumption is relatively low.
After the interfering data generation module is triggered, produce immediately the interference signal identical with disturbed signal bandwidth.The emission radio-frequency module changes into wireless signal with the interference signal that generates, and goes out through power amplifier and antenna transmission.This interference signal is mainly for long training sequence and the SIGNAL(L-SIG of frame head in former Frame) field.For the Frame of IEEE 802.11n and IEEE 802.11ac standard, interference signal for also comprise HT-SIG field and VHT-SIG-A field.After long training sequence was disturbed, the time of receiving terminal, frequency precise synchronization and channel estimation process be subject to interference, made receiving terminal can not get correct parameter, and SIGNAL field and follow-up data can not correctly be parsed.After the SIGNAL field was disturbed, receiving terminal can not correctly obtain the information such as the modulation system of Frame and length, just can not be correctly decoded follow-up data.Like this, the physical layer of receiving terminal can not correctly parse MPDU, and the MAC layer will not send the ACK frame to transmitting terminal, so transmitting terminal will retransmit these frame data.After transmitting terminal reaches maximum retransmission, these frame data will be dropped, thereby make WAP (wireless access point) in the interference signal coverage and the website can not proper communication, realize shielding and the effect of disturbing.
In the present invention, the WLAN (wireless local area network) shielding device only need to disturb the long training sequence in Frame and SIGNAL field, and long training sequence and SIGNAL field shared proportion in whole Frame is very little, does not therefore need to continue the emission interference signal.The interference signal of emission needle to long training sequence and SIGNAL field, concerning the interference signal of whole Frame, power consumption significantly reduces with respect to emission needle.For example in IEEE 802.11a standard, under the condition of 20MHz bandwidth, for every frame data, only launch 16 μ s interference signals.When transmission rate is 6Mbps, when a frame data length is 1000 bytes, only account for 1.18% of frame data launch time the launch time of interference signal; When a frame data length is 2000 byte, only account for 0.59% of frame data launch time the launch time of interference signal.Can significantly reduce like this power consumption of WLAN (wireless local area network) shielding device when work, reduce the operating cost of integral device.
When the long training sequence of frame head and SIGNAL field, for different communication standard and signal bandwidth, the time span of interference signal emission is different in the interfering data frame.For example, in the network of IEEE 802.11a/g standard, corresponding interference signal launch time is that 16 μ s, 32 μ s or 64 μ s(are different and different along with signal bandwidth with it); In the network of IEEE802.11n/ac standard, corresponding interference signal launch time is 24 μ s with it.Interference signal corresponding to distinct communication standards and signal bandwidth is as shown in table 1 launch time.
Interference signal launch time under table 1 IEEE 802.11a/g/n/ac series standard
In IEEE 802.11a/g, IEEE 802.11n and IEEE 802.11ac standard, the time range of interference signal emission is respectively as Fig. 8, Fig. 9 and shown in Figure 10.
Should be noted that it is more known ins and outs for the person of ordinary skill of the art that top description has been omitted for the present invention is more readily understood.
Above WLAN (wireless local area network) shielding device provided by the present invention and screen method are had been described in detail.To those skilled in the art, any apparent change of under the prerequisite that does not deviate from connotation of the present invention, it being done all will consist of infringement of patent right of the present invention, through bearing corresponding legal liabilities.
Claims (9)
1. WLAN (wireless local area network) shielding device is characterized in that:
Described WLAN (wireless local area network) shielding device comprises antenna, received RF module, frequency sweep module, thick synchronization module, interfering data generation module, emission radio-frequency module and power amplifier;
Described received RF module connects described antenna on the one hand, connects respectively on the other hand described frequency sweep module and described thick synchronization module;
The output of described thick synchronization module connects respectively described interfering data generation module, described emission radio-frequency module and described power amplifier; Described interfering data generation module is connected with described power amplifier by described emission radio-frequency module; The output of described power amplifier is connected with described antenna.
2. WLAN (wireless local area network) shielding device as claimed in claim 1 is characterized in that:
At the resident frequency of described received RF module, described thick synchronization module search short training sequence; In case described thick synchronization module searches described short training sequence, trigger described interfering data generation module, described emission radio-frequency module and described power amplifier, the emission interference signal.
3. WLAN (wireless local area network) shielding device as claimed in claim 2 is characterized in that:
Described interference signal is implemented to disturb for long training sequence and the SIGNAL field of frame head in Frame.
4. a WLAN (wireless local area network) screen method, realize based on WLAN (wireless local area network) shielding device as claimed in claim 1, it is characterized in that:
The frequency sweep module is carried out frequency sweep to the current wireless local area network (LAN), after determining the information of current wireless local area network (LAN), and the frequency of the resident scanning of received RF module;
Described thick synchronization module is at current resident frequency, Frame is carried out the identification of short training sequence, in case described thick synchronization module searches described short training sequence, trigger described interfering data generation module, described emission radio-frequency module and described power amplifier, the emission interference signal;
Described interference signal is implemented to disturb for long training sequence and the SIGNAL field of frame head in Frame, makes receiving terminal can not identify the information that comprises in long training sequence and SIGNAL field, realizes the shielding of current wireless local area network (LAN) is disturbed.
5. WLAN (wireless local area network) screen method as claimed in claim 1 is characterized in that:
In the situation that described short training sequence is not identified by described thick synchronization module, described interfering data generation module, described emission radio-frequency module and described power amplifier are in holding state, there is no the interference signal emission.
6. WLAN (wireless local area network) screen method as claimed in claim 1 is characterized in that:
Described interference signal has identical bandwidth with disturbed signal.
7. WLAN (wireless local area network) screen method as claimed in claim 1 is characterized in that:
For the Frame of IEEE802.11n standard, described interference signal is implemented to disturb for wherein long training sequence, L-SIG field and HT-SIG field.
8. WLAN (wireless local area network) screen method as claimed in claim 1 is characterized in that:
For the Frame of IEEE802.11ac standard, described interference signal is implemented to disturb for wherein long training sequence, L-SIG field and VHT-SIG-A field.
9. WLAN (wireless local area network) screen method as claimed in claim 1 is characterized in that:
Adjust according to communication standard and signal bandwidth the launch time of described interference signal.
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