CN104661213A - Novel unit and user equipment for providing scheduled network resources by WiFi network - Google Patents

Novel unit and user equipment for providing scheduled network resources by WiFi network Download PDF

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Publication number
CN104661213A
CN104661213A CN201310601885.6A CN201310601885A CN104661213A CN 104661213 A CN104661213 A CN 104661213A CN 201310601885 A CN201310601885 A CN 201310601885A CN 104661213 A CN104661213 A CN 104661213A
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China
Prior art keywords
wireless
network
antenna
wireless network
standard
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CN201310601885.6A
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Chinese (zh)
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罗紫紫
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Shanghai Yi Shang Information Technology Co Ltd
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Shanghai Yi Shang Information Technology Co Ltd
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Priority to CN201310601885.6A priority Critical patent/CN104661213A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/08Network architectures or network communication protocols for network security for supporting authentication of entities communicating through a packet data network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W12/00Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06Authentication

Abstract

The invention discloses a novel unit and user equipment for providing scheduled network resources by a WiFi network. The authentication types announced by the former Wi-Fi alliance are *WPA/WPA2, wherein WPA/WPA2 is a test program established on the basis of single-mode, dual-mode or dual-band products of IEEE802.11a, 802.11b and 802.11g, and contains the authentication of communication protocols, the authentication of wireless network security mechanisms and the testing of network transmission performance and compatibility. According to the novel unit and user equipment for providing scheduled network resources by a WiFi network, when multimedia is transferred by a wireless network, how to prolong the service life of batteries through management of the standby time of a wireless network device without affecting the functionality can be authenticated through tests of WMMPowerSave.

Description

Novelly provide schedule network resources unit and subscriber equipment by WiFi network
The present invention is novel provides schedule network resources unit and subscriber equipment to belong to message area by WiFi network.
There is not English full name in Wi-Fi, Wireless Fidelity is the deciphering of mistake in fact, is only used to be convenient to promote and used for reference the literary style of Hi-Fi.
Wi-Fi refers to " Wireless Fidelity " at the category of WLAN (wireless local area network), is in fact novel commercial verification, and be also novel radio networking technology, connecting computer by netting twine in the past, 2010 is then networked by radio wave simultaneously; Common is exactly a wireless router, the effective range so covered at the electric wave of this wireless router can adopt Wi-Fi connected mode to network, if wireless router is connected to an adsl line or other online circuit, be then otherwise known as focus.
Wi-Fi online simply can be interpreted as wireless Internet access, and many smart mobile phones in 2010 and most panel computer all support that Wi-Fi surfs the Net, and is to use the widest new wireless networks transmission technology now.
In fact exactly cable network signal is converted to wireless signal, as beginning for everybody introduce the same, use wireless router for the related computer supporting its technology, mobile phone, dull and stereotypedly wait reception.
If mobile phone has Wi-Fi function, just can not be surfed the Net by the network of mobile UNICOM when there being Wi-Fi wireless signal, eliminating traffic fee.
But Wi-Fi signal is also provided by wired network, the ADSL of such as family, partial wideband and so on, as long as connect a wireless router, just wire signal can be converted to Wi-Fi signal.
Be covered with the Wi-Fi signal that provided by government or major company in external a lot of developed countries city everywhere for resident, China's this technology in 2010 is not also promoted.
Current or the very easy realization so Wi-Fi surfs the Net, as long as change router traditional for our family expenses into wireless router, simply arrange down and can realize Wi-Fi wireless network and have shared, general Wi-Fi Signal reception radius about 95 meters, but can affect by wall etc., actual range can be smaller, but office needless to say, also can use in Zheng Dong building, because distance neither be far.
Wi-Fi get online without being tethered to a cable 2010 more conventional in big city, although be not fine by the radio communication quality of Wi-Fi technical transmission, data security performance BELAND tooth is weaker, transmission quality also haves much room for improvement, but transmission speed quickly, can 54Mbps be reached, meet the demand of individual and social informatization.
The topmost advantage of Wi-Fi is not need wiring, by the restriction of wiring condition, therefore can not very be applicable to the needs of mobile office user, and because transmit signal power is lower than 100mw, lower than mobile phone transmission power, so Wi-Fi online is also relatively most safety and Health.
Wi-Fi is the wireless network technologies of IEEE definition, when IEEE official definition 802.11 standard in 1999, IEEE selects and has assert that the wireless network technologies that CSIR O invents is wireless network technologies best in the world, therefore the wireless network technologies standard of CSIR O, just becomes the core technology standard of Wi-Fi in 2010.In " wireless network " tab under " preferred network ", click and will connect for the wireless network of its configuration 802.1X authentication, then click " attribute ".
In " authentication " tab, perform the operation of following any one:
To connect for this reason enable IEEE 802.1X authentication, " network enables IEEE 802.1X authentication for this reason " check box please be choose, under default situations, this check box will be chosen.
Forbidding IEEE 802.1X authentication to be connected for this reason, " network enables IEEE802.1x authentication for this reason " check box please be remove.
In " EAP type ", click " extendible authentication protocol (the EAP) " type that will be used for this and connect.
If chosen in " EAP type " " smart card or other certificates ", please click " attribute ", and operation below performing in " smart card or other certificate attributes ":
Use resident on smart cards for the certificate of authentication, please click " smart card using me ".
Use the certificate for authentication in resident certificate store on computers, please click " on this computer, using certificate ", then specify and whether use simple certificate to select.
The server certificate that the computer being verified as you provides is still effective, please choose " authentication server certificate " check box, specify one or more servers that your computer can be dynamically connected certainly, then specifies trusted root certificate issuing organization.
Check the details about selected root authority, please click " checking certificate ".
When the user name in smart card or certificate is different from the user name in logged in territory, " for this reason connecting the different user name of use one " check box to use another user name, please be choose.
If chosen in " EAP type " " shielded EAP (PEAP) ", please click " attribute ", then perform following operation:
In " selection auth method ", click the auth method that will use in PEAP, then click " configuration ".
If you choose " protected cryptographic (EAP-MSCHAP v2) "; so; the username and password for authentication that please whether appointment uses you to key in Windows login screen in " EAP MSCHAP v2 attribute " (and territory; if applicable); please click OK, and then click OK.
If you select " smart card or other certificates ", so, please in " smart card or other certificate attributes ", also configure setting as required, click OK according to the explanation in step 6, and then click OK.
In " authentication " tab, perform following operation:
When user does not log in, designated computer to attempt the authentication of accesses network, " authentication is computer when computerized information is available " check box please be choose.This check box will be chosen under default situations.
When user profile or computerized information unavailable time, designated computer to attempt the authentication of accesses network, please choose " when user or computerized information unavailable time authentication be guest " check box.
Main points
Strong suggestion, when being connected to 802.11 wireless network, uses 802.1X authentication.802.1X is an ieee standard, and this standard strengthens fail safe and deployment by providing to the support of centralized user ID, authentication, dynamic key management and record keeping.Details, refer to " related subject ".
In order to strengthen fail safe, in Windows XPService Pack 1 and Windows Server 2003 family, will to needing accessing points (foundation structure) the Web vector graphic 802.1X authentication using netkey (WEP).WEP provides data confidentiality by the data sent between encryption wireless client and radio access point.Other information of relevant wireless network security, refer to " related subject ".
If attempt connecting computer-to-computer network or without the need to using the accessing points network of netkey, then arranging unavailable in " authentication " tab, and 802.1X authentication cannot be configured for this connection.
Note
Perform this task and do not require that there is administration credentials.Therefore, as the optimum operation of fail safe, please consider do not have the user identity of administration credentials to perform this task.
tok:wirelessicon
When detect may limit or stop be connected to wireless network such wrong time, notification area will show the novel mark of wireless warning.
To open Network Connections, clickStart, clickControl Panel, and then double-clickNetwork Connections.
Define 802.1X authentication, prior wireless network must be selected to connect, or a new wireless network must be added connect.About how adding the information that new wireless network connects, [1] refers to " related subject ".
Network standard typical standard has following several:
IEEE802.11a: use 5GHz frequency range, transmission speed 54Mbps, incompatible with 802.11b
IEEE 802.11b: use 2.4GHz frequency range, transmission speed 11Mbps
IEEE802.11g: use 2.4GHz frequency range, transmission speed mainly contains 54Mbps, 108Mbps, can backward compatible 802.11b
IEEE802.11n draft: use 2.4GHz frequency range, transmission speed can reach 300Mbps, and standard is still draft, but product emerges in an endless stream.
Current IEEE802.11b is the most frequently used, but IEEE802.11g has more the strength of generation standard, and 802.11n is also in fast development.
IEEE802.11b standard contains two parts guaranteeing access control and encryption, and these two parts must each equipment in wireless lans configure.The company having hundreds and thousands of Wireless LAN users needs reliable security solution, effectively can manage from a control centre.Lacking the security control of concentrating is the basic reason that WLAN only obtains using in some little companies relatively and application-specific.
IEEE802.11b standard definition two kinds of mechanism provide the access control of WLAN and maintain secrecy: service set identifier identifier (SSID) and Wired Equivalent Privacy (WEP).The mechanism also having novel encryption is undertaken by transparent operation VPN on wireless lan (VPN).
SSID, the characteristic often used in WLAN is the naming number being called SSID, and it provides the access control in low level.SSID is the network name of equipment in WLAN subsystem normally; It is at this Ground Split subsystem.
WEP, IEEE802.11b standard defines the novel optional encryption scheme being called Wired Equivalent Privacy (or being called WEP), provides the mechanism guaranteeing Wireless LAN data stream.WEP utilizes a symmetrical scheme, in the encryption and decryption process of data, use identical key and algorithm.
Noun is resolved WLAN (wireless local area network) noun and is resolved.Network can be divided into local area network (LAN) according to territorial classification, metropolitan area network and wide area network.
Modulation system:
11MbpsDSSS physical layer adopts complementary code keying (CCK) modulating mode.CCK has identical channel approach with existing IEEE802.11DSSS, and 2.4GHzISM frequency range has three non-interfering independent channels, and each channel accounts for 25MHz.Therefore, CCK has multi-channel operation characteristic.
PCI slot wireless network card (NIC):
Can not cable be needed and make your microcomputer and other computer at network communication.Wireless NIC is similar to other network interface card, unlike, it is by radio wave instead of physical cables transceiving data.Wireless NIC needs to add exterior antenna in order to the effective range expanding them.
PCMCIANIC:
The same with wireless NIC above-mentioned, just they are applicable to the pc card slot of laptop.Similar with desktop computer, you can use exterior antenna to strengthen PCMCIA wireless network card.
AP access point (ACCESSPOINT, also known as wireless lan transceiver):
For the wireless HUB of wireless network, it is the core of wireless network.It is the access point that mobile computer user enters wired ethernet backplane, and AP can be arranged on ceiling or wall easily, and it can reach 300 meters at open space maximum coverage range, and wireless transmission rate can up to 11Mbps.
Antenna:
Wireless lan antenna can the coverage of extended wireless network, and different office blocks is coupled together.Like this, user can carry with notebook computer and moves between building or between room
Dynamic rate is changed:
When radio frequency situation is deteriorated, message transmission rate can be reduced to 5.5Mbps, 2Mbps and 1Mbps from 11Mbps.
Roaming is supported:
When user moves between building or corporate department, allow to carry out seamless link between accessing points.IEEE802.11 wireless network standards allows wireless network user in the different wireless bridge network segments, to use identical channel or roam mutually between different channels.
Load balancing:
When AP become load excessive or signal weakens time, NIC can change the accessing points AP be attached thereto, and is automatically transformed into best available AP, to improve performance.
Spread spectrum technique:
Be the novel modulation technique grown up in nineteen forties, it sends signal transmission in the broadband of radio frequency.Comprise frequency-hopping spectrum-expanding (FHSS) and direct sequence spread spectrum (DSSS) two kinds.Frequency-hopping spectrum-expanding is limited in 2Mb/s data transmission rate, and suggestion is used in specific applications.For the WLAN service that other are all, direct sequence spread spectrum is one and better selects.In IEEE802.11b standard, allow to adopt the Ethernet speed of DSSS to reach 11Mb/s.
Automatic rate selection function:
Under IEEE802.11 wireless network standards allows mobile subscriber to be arranged on automatic rate selection (ARS) pattern, ARS function can be the transmission rate of each selection of transmission paths the best according to the quality of signal and with the distance of bridge access point automatically, and this function can also become different stationary applications speed according to the different application ambient As of user.
Electrical source consumption management function:
IEEE802.11 also defines the signaling method of MAC layer, by the control of power management software, makes mobile subscriber to have the longest battery life.Power management can without making network be in dormancy (low power supply or power-off) state during transfer of data, so just may lost data packets.For addressing this problem, IEEE802.11 defines AP should be had buffering area and remove storing information, and the mobile subscriber being in dormancy regularly can wake up and recover this information.
Function of keeping secret:
Only reliable not by common straight sequence spread spectrum coding modulation technique, as used radio wideband scanner, its information is easily stolen again.Up-to-date wlan standard have employed the method for the secret byte of novel loading, makes wireless network have the confidentiality of same wired ethernet same levels.This cipher coding technology is applied in US military radio confidential communication in early days, the other end of Wireless Communication Equipment must use same cipher coding mode just can communicate mutually, also must by the safety certification of AP access point when wireless user utilizes AP access point to be connected into cable network.This technology not only can prevent aerial * * * *, and is the novel method of the effective mobile subscriber of wireless network authentication.
CSMA/CD agreement:
Wired ethernet local area network is CSMA/CD at the standard agreement of MAC layer, i.e. Carrier Sense Multiple access/collision detection.But whether the adapter due to wireless product not easily detects channel exists conflict, the therefore novel new agreement of IEEE802.11 whole new definition, i.e. Carrier Sense Multiple access/conflict avoidance (CSMA/CA).On the one hand, carrier sense checks that whether medium is idle; On the other hand, waited for by the random time, the probability that signal conflict is occurred reduces to minimum, when medium is listened the free time, then preferentially sends.Moreover, in order to make system more firm, IEEE802.11 additionally provides the CSMA/CA agreement of band acknowledgement frame ACK.
Packets of information is reformed:
When transmitting frame and being subject to severe jamming, must retransmit.If therefore a packets of information is larger, expending of required re-transmission is also larger; At this moment, if reduce frame size, large packets of information is divided into some little packets of information, even if retransmit, is also re-transmission little packets of information, expends relatively little many.So just greatly can improve the antijamming capability of wireless network in noise jamming area.
DHCP supports:
DHCP (DHCP) automatically obtains and rents IP address from Dynamic Host Configuration Protocol server, automatically obtains new IP address to work on, thus enjoy seamless roam when notebook computer user is broken in a network.
Network class individual net
Private wireless network (WPAN) is among a small circle, be interconnected the wireless network that several device formed, normally individual can and scope in.Such as bluetooth frames connecting with headphone and kneetop computer, ZigBee also provides the application platform of private wireless network.
Bluetooth is open, a short-distance wireless communication technology standard.This technology does not want to be another novel radio local area network (LAN) (WLAN) technology, it towards be connection among a small circle between mobile device, thus essentially it is the technology of novel replacement cable.It can be used for, compared with replacing current multiple cable connection scheme in short distance, penetrating the obstacles such as wall, by unified short range links, realize flexibly between various digital device, safety, low cost, the speech of low power consumption and data communication.
Bluetooth power is novel accomplishes: must be safe as cable; Drop to the cost the same with cable; Numerous equipment of mobile subscriber can be connected simultaneously, form piconet (piconet); Support the interconnection between different piconet, form scatternet; Support two-forty; Support different data types; Meet the requirement of low-power consumption, compactness, to embed small type mobile devices; Finally, this technology must possess global general-use, roams leisurely in each corner in the world to facilitate user.
From professional angle, bluetooth is novel radio access technology.From technical standpoint, bluetooth is an innovative technology, and the industry that it brings is a dynamic industry of richness, and therefore say that bluetooth is also an industry, it has been regarded as the important component part of whole moving communicating field by industry.Bluetooth is not only a chip, but a network, the foreseeable future, the private wireless network be made up of bluetooth is by ubiquitous.It or the pusher of GPRS and 3G.[2]
Regional network
Based on cognitive radio technology, IEEE802.22 defines the air interface being applicable to WRAN system to radio area network (Wireless Regional Area Network is called for short WRAN).WRAN system works is in the television band of 47MHz ~ 910MHz high band/hyper band, owing to there being user's (as TV user) to occupy this frequency range, therefore 802.22 equipment must detect and use the system of same frequency to avoid interference.
Metropolitan area network
Wireless MAN is the wireless network pattern connecting several WLAN (wireless local area network).
In January, 2003, a new wireless metropolitan area network standard IEEE802.16a formally passes through.The tissue being devoted to this research on standard is WiMax forum---World Interoperability for Microwave Access, WiMax (Worldwide Interoperability for Microwave Access) tissue.As a non-profit industry parties, WiMax is created jointly by Intel and other numerous leading communications components and equipment company.By in by the end of January, 2004, its number of members increases rapidly more than 70 by 28 before, has attracted the operators such as AT & T, Pacific Century CyberWorks especially, and Siemens moves and the participation of the communication manufacturer such as the ZTE Corporation of China.The president WiMax chairman LaBrecque that holds concurrently thinks, this will be a milestone of this organizational development.Although the commercial process of reality needs time, the data issued from WiMax forum shows, WiMax positive force is novel become after WLAN (wireless local area network) alliance Wi-Fi another there is the wireless industry alliance of abundant Industrial Effects power.As the Major Members of WiMax, Intel is devoted to the exploitation of IEEE 802.16 wireless MAN chip always.It is reported, Intel is expected to start selling chip based on IEEE 802.16d standard the second half year in 2004, and this chip can help to realize terminal equipment and be connected with the wireless high-speed of antenna.And the outdoor installation work of WiMax also will the first half of the year in 2005, the second half year will carry out the indoor location of WiMax antenna.Be expected to appear on the market at the beginning of 2006 with the WiMax chipset based on IEEE 802.16e standard.[3]
Device type is in WLAN (wireless local area network), and common equipment has wireless network card, wireless bridge, wireless antenna etc.
Wireless network card
The effect of wireless network card is similar to the network interface card in Ethernet, as the interface of WLAN (wireless local area network), realizes the connection with WLAN (wireless local area network).Wireless network card, according to the difference of interface type, is mainly divided into three types, i.e. PCMCIA wireless network card, PCI wireless network card and USB wireless network card.
PCMCIA wireless network card is only applicable to notebook computer, supports hot plug, can realize mobile wireless access easily.
PCI wireless network card is applicable to common desktop computer and uses.The PCI wireless network card pcmcia card that just insertion one piece is common on PCI adapter in fact.
USB interface wireless network card is applicable to notebook and desktop computer, and support hot plug, if network interface card is external wireless antenna, so, USB interface is exactly a reasonable selection.
Wireless bridge
From effect understand wireless bridge, it may be used for connect two or more independently network segment, these independently network segment be usually located in different buildings, at a distance of hundreds of rice to tens kilometers.What it can be widely used between different building thus is interconnected.Meanwhile, different according to agreement, wireless bridge can be divided into again the wireless bridge of 802.11b, 802.11g and 802.11n of 2.4GHz frequency range and 802.11a and 802.11n of employing 5.8GHz frequency range.Wireless bridge has three kinds of working methods, point-to-point, point-to-multipoint, relaying bridge joint.Be specially adapted to the telecommunication in city.
Under the condition without tall and big obstacle (mountain peak or building), the interim networking of a pair fast networking and field work.Its operating distance depends on environment and antenna, the point-to-point microwave interconnection of existing 7km.The directional antenna of a pair 27dbi can realize the point-to-point microwave interconnection of 10km.The directional antenna of 12dbi can realize the point-to-point microwave interconnection of 2km; A pair wireless bridge being implemented to link layer functionality is bridge, and has the Network layer function such as route, can realize the interconnected equipment of heterogeneous network wireless router by layer in fact at the directional antenna of network 24dbi, also can be used as third layer bridge and uses.
Wireless bridge, normally for outdoor, is mainly used in connection two networks, use wireless bridge only can not use one, required two or more, and AP can be used alone.Wireless bridge power is large, long transmission distance (maximum reach about 50km), and antijamming capability is strong, does not carry antenna, is generally equipped with the point to point connect that parabolic antenna realizes long distance; Some new integrated equipments are also all mostly enthusiastically out, complete.
Wireless antenna
When computer and wireless aps or other computers apart from each other time, along with weakening of signal, or transmission rate obviously declines, or cannot realize and communication between AP or other computers at all, now, just must by means of wireless antenna to the signal that receives or send carry out gain (amplification).
Wireless antenna has polytype, but common are two kinds, and novel is domestic aerial, and advantage is convenient, flexible, and shortcoming is that gain is little, and transmission range is short; Novel is exterior aerial.The type of exterior aerial is many, such as: fence type, flat, parabolical etc.The advantage of exterior aerial is long transmission distance.Relatively be applicable to long-distance transmissions.
Network radiation endangers larger in wireless network use procedure to old man, children, pregnant woman, the equipment such as wireless router, wireless aps is not launching electric wave all the time, the electromagnetic radiation of high dose can affect and destroy the original bioelectricity of human body and biological magnetic field, original electromagnetic field in human body is occurred abnormal.It should be noted that different people or same person are different in the ability to bear of Different age group to electromagnetic radiation, old man, children, pregnant woman are the crowds to electromagnetic radiation sensitivity, and resistance is more weak, should be the object of protection of our emphasis.
The radiation of wireless network is in fact very faint
The size of radiation depends primarily on the size of transmitting power, the regulation of China's Wireless Management Committee: the transmitting power of Wireless LAN Equipments can not be greater than 10mW, and the standard relative loose of other countries, such as: the upper limit of the transmitting power of the Wireless LAN Equipments of Japan is 100mW, more American-European countries are about 50mW.Institute's product sold generally all meets the standard of American-European countries on the market.It is many that mobile phone can arrive 1W high-power time, and the transmitting power of most wireless router is also just between the mW of 50mW ~ 100, and the power of wireless network card is generally at below 10mW.
The antenna changing high-gain can not increase radiation
Radio network product on market, the gain of antenna is generally 2dBi and 3dBi, and in order to the expansion of wireless signal, some users like the antenna changing high-gain.Because antenna is passive device, power can't be increased, no matter add the antenna of large gain, the power that it is launched all can not be higher than 50mw, transmitting power depends primarily on transmitting focus, i.e. wireless router, wireless aps itself, as long as their power meets safety standard, everybody just can the antenna of relieved replacing high-gain.
The mechanism of radiation hazradial bundle human body
Thermal effect: human body more than 70% is water, hydrone is subject to phase mutual friction after electromagenetic wave radiation, causes body to heat up, thus has influence on the normal work of intracorporeal organ.
Non-thermal effect: the Organ and tissue of human body all exists faint electromagnetic field, they are stable and orderly, once be subject to the interference of external electromagnetic field, the weak electromagnetic field being in poised state is about to be destroyed, and human body also can be damaged.
Cumulative effect: after thermal effect and non-thermal effect act on human body, (usually said human body holding capacity---interior drag) before self-regeneration is not yet able to do in time to the injury of human body, again be subject to the words of electromagenetic wave radiation, its extent of injury will be accumulated, of a specified duration can become permanent morbid state, threat to life.For the colony of Long Term Contact electromagenetic wave radiation, even if power is very little, frequency is very low, also may bring out unimaginable pathology, should cause vigilant.
How to avoid the injury that wireless radiation brings
The radiation of wireless network depends primarily on transmitting power, from wireless transmission point more close to local radiation stronger, so wireless routing, wireless aps should be placed in away from people the place of some, from bedroom also want away from some, avoid old man as far as possible, children are in-plant with pregnant woman, long contacts the equipment such as wireless router, should turn off power supply before sleep in the evening.Be also noted that in addition and avoid the undue close electronic equipment such as sound equipment, TV of wireless product, prevent mutual interference from producing other radiation.As long as everybody keeps larger distance, avoid living in the cumulative effect caused in wireless network environment for a long time, form good use habit, just should be no problem.
Cyberthreat wireless network secure is not an independently problem, enterprise need recognize and on several battle lines, tackle assailant, but have many threats be wireless network exclusive, this comprises:
1, interpolation attacks: interpolation attacks is to dispose unauthorized equipment or to create based on new wireless network, and this deployment or establishment be not often through security process or safety inspection.Can be configured access point, when requiring that client accesses, input password.If do not have password, invader just can communicate with access point by enabling a wireless client, thus is connected to internal network.But the access password of all clients that some access point requires is unexpectedly identical.This is danger close.
2, assailant is roamed: assailant there is no need to be positioned at enterprise buildings inside physically, and they can use network scanner, as instruments such as Netstumbler.Can smell with notebook computer or other mobile device on a moving vehicle and lean out wireless network, this activity is called " wardriving "; Walk in the street or perform same task by enterprise web site, this is called " warwalking ".
3, rogue access point: so-called rogue access point refers to when not obtaining the possessory license of wireless network or knowing, the access point just arranging or exist.Some employees install rogue access point sometimes, its objective is to avoid the mounted security means of company, creating hidden wireless network.Although this secret network is substantially harmless, it can construct the network of a unprotect measure, and and then act as the open door of invader's Entry Firm network.
4, two-sided demon attacks: this attack is also sometimes referred to as " wireless fishing ", and two-sided demon is exactly a rogue access point stashed with contiguous network name in fact.Two-sided demon waits for that users of some blindness trusts enter the access point of mistake, then steals the data of individual networks or attacks computer.
5, steal Internet resources: some user likes from contiguous wireless network access the Internet, even if what malice they do not have look forward to novel, but still a large amount of network bandwidths can be taken, have a strong impact on network performance.And more uninvited guest can utilize this connection to send mail in firm-wide, or download pirate content, this can produce some legal issues.
6, to abduction and the supervision of radio communication: as in cable network, it is completely possible for kidnapping and monitoring by the network service of wireless network.It comprises two kinds of situations, and one is wireless data packet analysis, and namely skilled assailant catches radio communication by the technology being similar to cable network.Wherein have many instruments can catch the initial part connecting session, and its data generally can comprise the user name and password.Then assailant just can falsely claim to be a validated user by caught information, and kidnaps user conversation and perform some unauthorized orders etc.The second situation is that broadcast packet monitors, this supervision depends on hub, so rarely found.
Certainly, also have some other threaten, as client-toclient attack (comprising Denial of Service attack), interference, to the attack of encryption system, the configuration etc. of mistake, this all belongs to the factor can bringing risk to wireless network.
 
The basic outfit of general erection wireless network is exactly wireless network card and an AP, so just can, with wireless pattern, coordinate existing wired backbone to carry out network resource sharing, and erection expense and complexity are well below traditional cable network.
If the peer-to-peer network of just several computers, also shouldn't AP, only need every platform computer accessory wireless network card.
AP is that Access Point is called for short, and is generally translated as " wireless access points ", or " bridger ".
It mainly plays the part of the bridge of wireless stations and wired local area network in medium access control layer MAC.
Had AP, just as the Hub of cable network general, wireless stations can fast and be connected with network easily.
Particularly for the use in broadband, the more aobvious advantage of Wi-Fi, wired broadband network (ADSL, community LAN etc.), behind family, is connected to an AP, then in computer, installs one piece of wireless network card.
Common family has an AP enough, even the neighbourhood of user authorized after, then without the need to increasing port, also can surf the Net in a shared manner.
Because the frequency range of Wi-Fi is worldwide without the need to any telecom operation license, therefore WLAN wireless device provides in a world wide operable, the extremely cheap and wireless air interface that data bandwidth is high of expense.
User can in Wi-Fi overlay area fast browsing webpage, answer whenever and wherever possible and call.
And some other wideband data based on WLAN is applied, as the function such as Streaming Media, online game is worth user to expect especially.
Had Wi-Fi function we make a long-distance call (comprising international long-distance), browsing page, send and receive e-mail, music download, digital photograph transmission etc., then the problem without the need to worrying that speed is slow and cost is high.
Wi-Fi (Wireless Fidelity) adopting wireless fidelity technology is the same with Bluetooth technology, belongs to the short distance wireless technical used in office and family.
Wi-Fi applies more and more extensive on hand-held device, and smart mobile phone is exactly a copy of it.
Different from the Bluetooth technology be applied in the early time on mobile phone, Wi-Fi has larger coverage and the transmission rate of Geng Gao, and therefore Wi-Fi mobile phone becomes the fashion of mobile communication industry in 2010.
The coverage of Wi-Fi in 2010 is more and more extensive at home, and there is Wi-Fi interface in the region on luxurious hotel, mansion district, airport and coffee shop and so on.
When we go tourism, office, just can our hand-held device be used to have surfed the web heartily in these places.
As long as manufacturer on airport, station, cafe, personnel's comparatively dense such as Novel book shop place " focus " is set, and by high-speed line, internet is accessed above-mentioned place.
Like this, the electric wave launched due to " focus " can reach the place apart from the tens of rice to 100 of access point radius meter, as long as user will support that the notebook computer of Wi-Fi or PDA or mobile phone or psp or ipodtouch etc. are taken in this region, can high-peed connection internet.
Be in and also can buy wireless router the wireless Internet access that local area network (LAN) then just can be delighted is set.
It is better that the difference of Wi-Fi and 3G technology is exactly 3G transmission quality when high-speed mobile, but the time standby Wi-Fi online of static state is enough.
Along with the continuous rise and development of wireless network, the application of Wi-Fi module in 2010 is quite extensive.
But Wi-Fi module is the product of a high frequency property after all, it does not resemble common consumer electronics product, some indescribable phenomenon and problems are had when Production design, some are allowed not have the hard thought of the engineer of high-frequency design experience, having the practitioner of correlation experience, is also often need the equipment by costliness to assist to analyze.
For the process of Wi-Fi part, have directly the design that Wi-Fi part Layout to PCB mainboard goes, this design, need courage and technology, because the price of module own is not high, the product price that mainboard is corresponding is high, when the problem having Wi-Fi part to produce, debugging is changed cumbersome, directly scraps unfortunately; So a lot of design is all ready to adopt modular Wi-Fi part, Wi-Fi portions modular directly can be allowed like this, easy to deal with, and module can directly be dismantled, the design risk of product and concrete consume are also had very great help.
Communication interface aspect: 2010 be adopt USB interface form substantially, PCIE and SDIO also has small part, and the market share of PCIE should be little, All-in-One expensive, and practicality is not strong, integrated a lot of functions all can not use, and are also novel waste in fact.
Power supply aspect: majority is directly powered with 5V, the power supply in motherboard design that also can utilize had is shared, and directly adopts 3.3V to power.
The processing form of antenna: built-in pcb board can be had to carry antenna or ceramic antenna; Also can pass through I-PEX joint, connect Antenna extender line, then allow antenna external.
Specification aspect: this can according to concrete designing requirement, and minimum has nano model (can directly do nano wireless network card); Have and can accomplish mini about 12*12 (normally external antenna mode adopts); The normally design multiple spot (be that plate carries antenna and ceramic antenna is many substantially, also have external antenna joint) of about 25*12.
Form with mainboard connects: can direct SMT, also can do plug-in unit connection (this assembling/easy to maintenance) by row's pin of 2.54.
The debugging of software will in conjunction with concrete scheme master control, and Wi-Fi part is only a wireless transmitting-receiving after all.
A lot of user, when consulting, is easy to obscure.Can say, within 2013, the most fiery field of Wi-Fi module application is exactly MID market, some traditional network field application markets also have infiltration simultaneously, some field of remote control of such as some industrial control fields/netcast field/even also have what consider, are that the part using network all wishes to attempt wireless penetration substantially.
Wi-Fi (Wireless Fidelity) is the same with Bluetooth technology, belongs to short distance wireless technical, is new network transmission standard.
In daily life, it is widely used already, and bringing great convenience: white collars browsing page, reporter in Startbuck beam back contribution, ordinary people arbitrary selection mobile phone or multiple stage notebook computer in own home and get online without being tethered to a cable at meeting scene, these all be unable to do without Wi-Fi.
But all the time, support that the mobile phone of Wi-Fi function obtains the license that networks at home because Ministry of Industry and Information prohibites, foreign brand mobile phone wants to enter market, China's Mainland and must extract Wi-Fi module or shield this function, becomes " castrating version " mobile phone said jokingly by a lot of people.
If " that enter Chinese market is ' castrating version ' iPhone, and that date of promulgation is exactly when I goes to buy smuggled goods.”
A lot of all the time to the banned discontented iPhone fans of Wi-Fi function all simultaneously have expressed similar viewpoint.
The middle foundation of a nation was intended to enforce WAPI standard in 1 day June in 2004, but suffer the resistance of the u s companys such as Intel and even U.S. government, until in June, 2009 WAPI obtains agreeing unanimously of more than 10 national members such as American and Britain, method first, will advance as international standard with text-independent form.
A lot of insider also remembers clearly to WAPI and the Wi-Fi battle before 2010.
In the end of the year 2003, State General Administration for Quality Supervision and national standardization administration committee issue bulletin, claim to enforce WAPI standard by starting from 1 day June in 2004.
The resistance of the u s companys such as Intel and even U.S. government has been suffered in this measure immediately, and threatens and will stop at China and carry out wireless traffic, claims compared with WAPI standard, and Western company is more ready to adopt their standard.
On April 22nd, 2004, China and the United States are through negotiation, and State Council of the People's Republic of China vice-premier Wu Yi at that time represents, American side's requirement is agreed to by China, will not enforce WAPI standard.
In July, China has been submitted to WAPI motion to International Standards Organization, but the WAPI standard of China encounters unprecedented blocking afterwards, and WAPI standard becomes international standard one thing and is forced to stranded.
According to the up-to-date policy of Ministry of Industry and Information in 2010, the mobile phone of the every WAPI of installing additional function can network and detects and obtain licence for entry to network, principle is that this kind of mobile phone can use WAPI to access when there being WAPI network, and when searching for less than WAPI, then carry out wireless network access by Wi-Fi, but pure Wi-Fi mobile phone still can not go on the market.
In most cases accelerate Wi-Fi speed by arranging fixed protocol.
The first step, first removes the Wi-Fi of the connection in mobile phone, namely selects not preserve!
Second step, inputs the control panel that 192.168.1.1 or 192.168.0.1 enters router in a browser, selects to arrange guide.
3rd step, becomes 11g Only schema modification, and generally that acquiescence is 11bgn Mixed.
4th step, restarter, then mobile phone reconnects Wi-Fi.
A Wi-Fi interface network members and structure sites (Station), the part that network is the most basic.
Basic service unit (Basic Service Set, BSS) is the most basic service unit of network.The simplest service unit can only be made up of two websites.
Distribution system (Distribution System, DS).
Distribution system is for connecting different basic service unit.
The medium that the medium (Medium) that distribution system uses uses with basic service unit is in logic well-separated, such as, although they may be physically same medium, same radio band.
Access point (Access Point, AP).The identity of the existing common website of access point, has again the function being linked into distribution system.
Expansion service unit (Extended Service Set, ESS).Formed by distribution system and basic service unit combination.
This combination is in logic, is not physically--different basic service unit things likely greatly differs from each other in geographical position.Distribution system also can use various technology.
Critical point (Portal) is also a logical components.For WLAN (wireless local area network) and cable LAN or other net connection are got up.
Website use wireless medium, distribution system use medium, and integrated with WLAN (wireless local area network) together with other local area network (LAN) use medium.
Physically they may overlap each other.
IEEE802.11 is only responsible for the addressing (Addressing) on the wireless medium of website use.The addressing of distribution system and other local area network (LAN) does not belong to the scope of WLAN (wireless local area network).
IEEE802.11 is not specifically defined distribution system, just defines the service (Service) that distribution system should provide.
Whole WLAN (wireless local area network) defines 9 kinds of services, 5 kinds of services belong to the task of distribution system, be respectively, connect (Association), terminate to connect (Diassociation), distribute (Distribution), integrated (Integration), then connect (Reassociation).
4 kinds of services belong to the task of website, are respectively, authentication (Authentication), terminate authentication (Deauthentication), privacy (Privacy), MAC data transmission (MSDU delivery).
Wireless in fashion, Wi-Fi has also become " superstar ".Wi-Fi is " golden helmet armor ", packs oneself from eight aspects comprehensively.
Intend 802.11 normal data rates to bring up to gigabit or a few gigabit although IEEE starts two projects, yet do not form first draft so far.
Actual is that data rate is improve a grade by 802.11n standard, different functions and equipment can be adapted to, two spatial data supported by all 11n wireless transmitters, transmit and receive data and can use two or three antenna combination, the wireless chip of Wi-Fi iPod Touch just containing a Botong (Broadcom) that apple is up-to-date, supports 11n standard.
To have chip very soon and support three, four data flow, data rate can reach 450Mbps and 600Mbps respectively.
At the beginning of 2009, Quantenna communication represents that it has succeeded in developing 4x4 chip, can carry digital TV in high resolution signal stream.
The common founder that Wi-Fi equipment supplier Ruckus is wireless and CTO William Kish say: " although do not have a lot of client device to support 4 spatial flows; as long as correct design access point; will be possible to use 600Mbps physical layer data rate, realize high-speed radio backbone network.”
In 11n, how optional performance characteristics will appear in wireless chip, and wireless client and radio access point utilize these chips that radio frequency (RF) signal can be made to have more elasticity, stable and reliable, in other words more resemble an electric wire.
The CTO William McFarland of Atheros company of wireless chip manufacturer says: " new 11n physical-layer techniques will make Wi-Fi with better function, and in given range, message transmission rate is higher, and transmission range is longer ".
McFarland says: " nowadays you have the notebook of Wi-Fi function around building one week with one, and you can find that data rate declines or disappears, but after using STBC, connection will work on ".
802.11n has carried out great innovation in power consumption and management aspect, can not only extend the battery life of Wi-Fi smart mobile phone, can also be embedded in miscellaneous equipment, as medical monitoring equipment, and building control system, real time location tracking label and consumption electronic product.
Can constantly monitor and collect data, personalization can be carried out based on the identity of user and position.
Network world (Network World) bloger Craig Mathias writes " other modern radio-frequency technology can not be accomplished, present Wi-Fi can accomplish ".
The McFarland of Atheros says: " along with the construction of enterprise wireless local area network (LAN), these infrastructure put in place, only need now to add low-power consumption sensor just passable ".
Various card format provides, allow the 5GHz wave band that equipment use is not crowded, the 11b/g wireless device that Gainspan provides is with an IP software stack, power consumption is very low, one piece of standard cell can run several years, and Redpine Signals provides a single current and is embedded in 11n radio communication.
The Internet most destructive influences are by theft proof of identification, Denial of Service attack, invasion of privacy, spy and lack the injury that corresponding trust means cause user, mobile network makes this situation become even worse, if users to trust connects as the Wi-Fi of front opening, them are likely made to suffer destructive risk.
IEEE have approved 802.11w standard; it protects wireless management frame; wireless link is worked better; Networks corporate Chief analyst Matthew Gast says: " Wi-Fi client can receive and adopt now ' land network ' information; this information may be utilize MAC Address to forge by the hacker breaking through accessing points before this, and 11w standard has cut off this attack ".
The safety of identity-based will be used, in Wi-Fi network, security strategy and user-association, instead of with port association, such benefit is that user can be in, office space, hotel, and branch and public place move, and fail safe can not be affected ".
Wi-Fi is the novel technology that the terminals such as PC, handheld device (as PDA, mobile phone) wirelessly can be connected to each other.Wi-Fi is the brand of a Wi-Fi communication technology, held by Wi-Fi Alliance (Wi-Fi Alliance).
Object be improve based on IEEE 802.11 standard Wi-Fi product between interoperability.
Current common people can lump Wi-Fi and IEEE 802.11 together.Even Wi-Fi is equal to wireless the Internet networking.
Wireless chip performance characteristics comprises: low density parity check code, improves error correcting capability; Launching beam is formed, and it uses the feedback from Wi-Fi client, allows an accessing points focus on the radiofrequency signal of client; Spatial time sharing group coding (STBC), it utilizes multiple antenna to improve signal reliability.
The certification kind that front Wi-Fi Alliance is announced has:
* WPA/WPA2:WPA/WPA2 is the test program set up based on the product of the single mode of IEEE802.11a, 802.11b, 802.11g, bimodulus or double frequency.
Content comprises the checking of communications protocol, the checking of wireless network security mechanism, and Internet Transmission shows and compatibility test.
WMM (Wi-Fi MultiMedia): when the transmission of audio-visual multimedia through wireless network, the mechanism how will verifying its Bandwidth guaranteed whether normal operation is the object of WMM test on different radio network devices and different security settings.
The present invention is novel provides schedule network resources unit and subscriber equipment when the transmission of audio-visual multimedia through wireless network by WiFi network, how through the stand-by time extending battery life of management radio network device, and it is functional not affect it, can verify through the test of WMM Power Save.
WPS (Wi-Fi Protected Setup): this certification of just issuing at the beginning of being one 2007, object allows consumer can carry out setting wireless network equipment through simpler mode, and ensure certain fail safe.
Current WPS allows to carry out setting wireless network equipment through the mode of Pin Input Config (PIN), Push Button Config (PBC), USB Flash Drive Config (UFD) and Near Field Communication, Contactless Token Config (NFC).
ASD (Application Specific Device): this is that other have the radio network device of special applications, such as DVD player, projector, printer etc. for except wireless network access point (Access Point) and platform (Station).
CWG (Converged Wireless Group): mainly for the test program that the RF part of Wi-Fi mobile converged devices is measured.

Claims (8)

1. provide schedule network resources unit and user device handset to have Wi-Fi function if the present invention is novel by WiFi network, just can not be surfed the Net by the network of mobile UNICOM when there being Wi-Fi wireless signal, eliminating traffic fee;
But Wi-Fi signal is also provided by wired network, the ADSL of such as family, partial wideband and so on, as long as connect a wireless router, just wire signal can be converted to Wi-Fi signal;
Be covered with the Wi-Fi signal that provided by government or major company in external a lot of developed countries city everywhere for resident, China's this technology in 2010 is not also promoted;
Current or the very easy realization so Wi-Fi surfs the Net, as long as change router traditional for our family expenses into wireless router, simply arrange down and can realize Wi-Fi wireless network and have shared, general Wi-Fi Signal reception radius about 95 meters, but can affect by wall etc., actual range can be smaller, but office needless to say, also can use in Zheng Dong building, because distance neither be far;
Wi-Fi get online without being tethered to a cable 2010 more conventional in big city, although be not fine by the radio communication quality of Wi-Fi technical transmission, data security performance BELAND tooth is weaker, transmission quality also haves much room for improvement, but transmission speed quickly, can 54Mbps be reached, meet the demand of individual and social informatization;
The topmost advantage of Wi-Fi is not need wiring, by the restriction of wiring condition, therefore can not very be applicable to the needs of mobile office user, and because transmit signal power is lower than 100mw, lower than mobile phone transmission power, so Wi-Fi online is also relatively most safety and Health;
Wi-Fi is the wireless network technologies of IEEE definition, when IEEE official definition 802.11 standard in 1999, IEEE selects and has assert that the wireless network technologies that CSIR O invents is wireless network technologies best in the world, therefore the wireless network technologies standard of CSIR O, just becomes the core technology standard of Wi-Fi in 2010.
2. the basic outfit of general erection wireless network is exactly wireless network card and an AP, and so just can, with wireless pattern, coordinate existing wired backbone to carry out network resource sharing, erection expense and complexity be well below traditional cable network;
If the peer-to-peer network of just several computers, also shouldn't AP, only need every platform computer accessory wireless network card;
AP is that Access Point is called for short, and is generally translated as " wireless access points ", or " bridger ";
It mainly plays the part of the bridge of wireless stations and wired local area network in medium access control layer MAC;
Had AP, just as the Hub of cable network general, wireless stations can fast and be connected with network easily;
Particularly for the use in broadband, the more aobvious advantage of Wi-Fi, wired broadband network (ADSL, community LAN etc.), behind family, is connected to an AP, then in computer, installs one piece of wireless network card;
Common family has an AP enough, even the neighbourhood of user authorized after, then without the need to increasing port, also can surf the Net in a shared manner;
Because the frequency range of Wi-Fi is worldwide without the need to any telecom operation license, therefore WLAN wireless device provides in a world wide operable, the extremely cheap and wireless air interface that data bandwidth is high of expense;
User can in Wi-Fi overlay area fast browsing webpage, answer whenever and wherever possible and call;
And some other wideband data based on WLAN is applied, as the function such as Streaming Media, online game is worth user to expect especially;
Had Wi-Fi function we make a long-distance call (comprising international long-distance), browsing page, send and receive e-mail, music download, digital photograph transmission etc., then the problem without the need to worrying that speed is slow and cost is high;
Wi-Fi (Wireless Fidelity) adopting wireless fidelity technology is the same with Bluetooth technology, belongs to the short distance wireless technical used in office and family;
Wi-Fi applies more and more extensive on hand-held device, and smart mobile phone is exactly a copy of it;
Different from the Bluetooth technology be applied in the early time on mobile phone, Wi-Fi has larger coverage and the transmission rate of Geng Gao, and therefore Wi-Fi mobile phone becomes the fashion of mobile communication industry in 2010;
The coverage of Wi-Fi in 2010 is more and more extensive at home, and there is Wi-Fi interface in the region on luxurious hotel, mansion district, airport and coffee shop and so on.
3., when we go tourism, office, just can our hand-held device be used to have surfed the web heartily in these places;
As long as manufacturer on airport, station, cafe, personnel's comparatively dense such as library place " focus " is set, and by high-speed line, internet is accessed above-mentioned place;
Like this, the electric wave launched due to " focus " can reach the place apart from the tens of rice to 100 of access point radius meter, as long as user will support that the notebook computer of Wi-Fi or PDA or mobile phone or psp or ipodtouch etc. are taken in this region, get final product high-peed connection internet;
Be in and also can buy wireless router the wireless Internet access that local area network (LAN) then just can be delighted is set;
It is better that the difference of Wi-Fi and 3G technology is exactly 3G transmission quality when high-speed mobile, but the time standby Wi-Fi online of static state is enough;
Along with the continuous rise and development of wireless network, the application of Wi-Fi module in 2010 is quite extensive;
But Wi-Fi module is the product of a high frequency property after all, it does not resemble common consumer electronics product, some indescribable phenomenon and problems are had when Production design, some are allowed not have the hard thought of the engineer of high-frequency design experience, having the practitioner of correlation experience, is also often need the equipment by costliness to assist to analyze;
For the process of Wi-Fi part, have directly the design that Wi-Fi part Layout to PCB mainboard goes, this design, need courage and technology, because the price of module own is not high, the product price that mainboard is corresponding is high, when the problem having Wi-Fi part to produce, debugging is changed cumbersome, directly scraps unfortunately; So a lot of design is all ready to adopt modular Wi-Fi part, Wi-Fi portions modular directly can be allowed like this, easy to deal with, and module can directly be dismantled, the design risk of product and concrete consume are also had very great help;
Communication interface aspect: 2010 be adopt USB interface form substantially, PCIE and SDIO also has small part, and the market share of PCIE should be little, All-in-One expensive, and practicality is not strong, integrated a lot of functions all can not use, and are also novel waste in fact;
Power supply aspect: majority is directly powered with 5V, the power supply in motherboard design that also can utilize had is shared, and directly adopts 3.3V to power.
4. the processing form of antenna: built-in pcb board can be had to carry antenna or ceramic antenna; Also can pass through I-PEX joint, connect Antenna extender line, then allow antenna external;
Specification aspect: this can according to concrete designing requirement, and minimum has nano model (can directly do nano wireless network card); Have and can accomplish mini about 12*12 (normally external antenna mode adopts); The normally design multiple spot (be that plate carries antenna and ceramic antenna is many substantially, also have external antenna joint) of about 25*12;
Form with mainboard connects: can direct SMT, also can do plug-in unit connection (this assembling/easy to maintenance) by row's pin of 2.54;
The debugging of software will in conjunction with concrete scheme master control, and Wi-Fi part is only a wireless transmitting-receiving after all;
A lot of user, when consulting, is easy to obscure; Can say, within 2013, the most fiery field of Wi-Fi module application is exactly MID market, some traditional network field application markets also have infiltration simultaneously, some field of remote control of such as some industrial control fields/netcast field/even also have what consider, are that the part using network all wishes to attempt wireless penetration substantially;
Wi-Fi (Wireless Fidelity) is the same with Bluetooth technology, belongs to short distance wireless technical, is new network transmission standard;
The first step, first removes the Wi-Fi of the connection in mobile phone, namely selects not preserve!
Second step, inputs the control panel that 192.168.1.1 or 192.168.0.1 enters router in a browser, selects to arrange guide;
3rd step, becomes 11g Only schema modification, and generally that acquiescence is 11bgn Mixed;
4th step, restarter, then mobile phone reconnects Wi-Fi;
A Wi-Fi interface network members and structure sites (Station), the part that network is the most basic;
Basic service unit (Basic Service Set, BSS) is the most basic service unit of network; The simplest service unit can only be made up of two websites;
Distribution system (Distribution System, DS);
Distribution system is for connecting different basic service unit;
The medium that the medium (Medium) that distribution system uses uses with basic service unit is in logic well-separated, such as, although they may be physically same medium, same radio band;
Access point (Access Point, AP); The identity of the existing common website of access point, has again the function being linked into distribution system;
Expansion service unit (Extended Service Set, ESS); Formed by distribution system and basic service unit combination.
5. this combination is in logic, is not physically--different basic service unit things likely greatly differs from each other in geographical position; Distribution system also can use various technology;
Critical point (Portal) is also a logical components; For WLAN (wireless local area network) and cable LAN or other net connection are got up;
Website use wireless medium, distribution system use medium, and integrated with WLAN (wireless local area network) together with other local area network (LAN) use medium;
Physically they may overlap each other;
IEEE802.11 is only responsible for the addressing (Addressing) on the wireless medium of website use; The addressing of distribution system and other local area network (LAN) does not belong to the scope of WLAN (wireless local area network);
IEEE802.11 is not specifically defined distribution system, just defines the service (Service) that distribution system should provide;
Whole WLAN (wireless local area network) defines 9 kinds of services, 5 kinds of services belong to the task of distribution system, be respectively, connect (Association), terminate to connect (Diassociation), distribute (Distribution), integrated (Integration), then connect (Reassociation);
4 kinds of services belong to the task of website, are respectively, authentication (Authentication), terminate authentication (Deauthentication), privacy (Privacy), MAC data transmission (MSDU delivery);
Wireless in fashion, Wi-Fi has also become " superstar "; Wi-Fi is " golden helmet armor ", packs oneself from eight aspects comprehensively.
6., although IEEE starts two projects plans and 802.11 normal data rates are brought up to gigabit or a few gigabit, yet do not form first draft so far;
Actual is that data rate is improve a grade by 802.11n standard, different functions and equipment can be adapted to, two spatial data supported by all 11n wireless transmitters, transmit and receive data and can use two or three antenna combination, the wireless chip of Wi-Fi iPod Touch just containing a Botong (Broadcom) that apple is up-to-date, supports 11n standard;
To have chip very soon and support three, four data flow, data rate can reach 450Mbps and 600Mbps respectively;
At the beginning of 2009, Quantenna communication represents that it has succeeded in developing 4x4 chip, can carry digital TV in high resolution signal stream;
The common founder that Wi-Fi equipment supplier Ruckus is wireless and CTO William Kish say: " although do not have a lot of client device to support 4 spatial flows; as long as correct design access point; will be possible to use 600Mbps physical layer data rate, realize high-speed radio backbone network; "
In 11n, how optional performance characteristics will appear in wireless chip, and wireless client and radio access point utilize these chips that radio frequency (RF) signal can be made to have more elasticity, stable and reliable, in other words more resemble an electric wire;
Can constantly monitor and collect data, personalization can be carried out based on the identity of user and position;
Network world (Network World) bloger Craig Mathias writes " other modern radio-frequency technology can not be accomplished, present Wi-Fi can accomplish ";
The McFarland of Atheros says: " along with the construction of enterprise wireless local area network (LAN), these infrastructure put in place, only need now to add low-power consumption sensor just passable ";
Various card format provides, allow the 5GHz wave band that equipment use is not crowded, the 11b/g wireless device that Gainspan provides is with an IP software stack, power consumption is very low, one piece of standard cell can run several years, and Redpine Signals provides a single current and is embedded in 11n radio communication;
The Internet most destructive influences are by theft proof of identification, Denial of Service attack, invasion of privacy, spy and lack the injury that corresponding trust means cause user, mobile network makes this situation become even worse, if users to trust connects as the Wi-Fi of front opening, them are likely made to suffer destructive risk;
IEEE have approved 802.11w standard, it protects wireless management frame, wireless link is worked better, Networks corporate Chief analyst Matthew Gast says: " Wi-Fi client can receive and adopt now ' land network ' information; this information may be utilize MAC Address to forge by the hacker breaking through accessing points before this, and 11w standard has cut off this attack ";
The safety of identity-based will be used, in Wi-Fi network, security strategy and user-association, instead of with port association, such benefit is that user can be in, office space, hotel, and branch and public place move, and fail safe can not be affected ";
Wi-Fi is the novel technology that the terminals such as PC, handheld device (as PDA, mobile phone) wirelessly can be connected to each other; Wi-Fi is the brand of a Wi-Fi communication technology, held by Wi-Fi Alliance (Wi-Fi Alliance);
Object be improve based on IEEE 802.11 standard Wi-Fi product between interoperability;
Current common people can lump Wi-Fi and IEEE 802.11 together; Even Wi-Fi is equal to wireless the Internet networking;
Wireless chip performance characteristics comprises: low density parity check code, improves error correcting capability; Launching beam is formed, and it uses the feedback from Wi-Fi client, allows an accessing points focus on the radiofrequency signal of client; Spatial time sharing group coding (STBC), it utilizes multiple antenna to improve signal reliability.
7. the present invention is novel provide schedule network resources unit and subscriber equipment by WiFi network before the certification kind announced of Wi-Fi Alliance have:
* WPA/WPA2:WPA/WPA2 is the test program set up based on the product of the single mode of IEEE802.11a, 802.11b, 802.11g, bimodulus or double frequency;
Content comprises the checking of communications protocol, the checking of wireless network security mechanism, and Internet Transmission shows and compatibility test;
The present invention is novel provides schedule network resources unit and subscriber equipment when the transmission of audio-visual multimedia through wireless network by WiFi network, how through the stand-by time extending battery life of management radio network device, and it is functional not affect it, can verify through the test of WMM Power Save;
WPS (Wi-Fi Protected Setup): this certification of just issuing at the beginning of being one 2007, object allows consumer can carry out setting wireless network equipment through simpler mode, and ensure certain fail safe;
Current WPS allows to carry out setting wireless network equipment through the mode of Pin Input Config (PIN), Push Button Config (PBC), USB Flash Drive Config (UFD) and Near Field Communication, Contactless Token Config (NFC);
ASD (Application Specific Device): this is that other have the radio network device of special applications, such as DVD player, projector, printer etc. for except wireless network access point (Access Point) and platform (Station);
CWG (Converged Wireless Group): mainly for the test program that the RF part of Wi-Fi mobile converged devices is measured.
8. it mainly plays the part of the bridge of wireless stations and wired local area network in medium access control layer MAC;
Had AP, just as the Hub of cable network general, wireless stations can fast and be connected with network easily.
CN201310601885.6A 2013-11-25 2013-11-25 Novel unit and user equipment for providing scheduled network resources by WiFi network Pending CN104661213A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105635694A (en) * 2016-03-09 2016-06-01 和县公安局 Long-distance wireless video surveillance system established based on WIFI local area network
CN105704239A (en) * 2016-03-31 2016-06-22 广州指点网络科技有限公司 High-speed download wireless hot spot cloud terminal and application method thereof
CN106375062A (en) * 2016-08-29 2017-02-01 浙江华飞智能科技有限公司 Control method of remote control system and primary device
CN107808182A (en) * 2017-10-24 2018-03-16 厦门信昇达物联科技股份有限公司 A kind of bookshelf

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105635694A (en) * 2016-03-09 2016-06-01 和县公安局 Long-distance wireless video surveillance system established based on WIFI local area network
CN105704239A (en) * 2016-03-31 2016-06-22 广州指点网络科技有限公司 High-speed download wireless hot spot cloud terminal and application method thereof
CN105704239B (en) * 2016-03-31 2018-08-24 广州指点网络科技有限公司 High-speed downloads hotspot cloud terminal and application process
CN106375062A (en) * 2016-08-29 2017-02-01 浙江华飞智能科技有限公司 Control method of remote control system and primary device
CN107808182A (en) * 2017-10-24 2018-03-16 厦门信昇达物联科技股份有限公司 A kind of bookshelf
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