Dominant eight major characteristics of Wi-Fi wireless network by Keith Farren
in Technology (submitted 2010-07-25)
In fashion limitlessly, wi-fi does not matter " The superstar " . Wi-fi may be " The deficient armour of gold " ,Pack oneself from eight respects in an all-round way. The ensuing chapters are from the bandwidth separately, the signal, power consumption, safe, melt the network, individual service, move the characteristic, the customer end is all-round to dissect the distinctive quality of wi-fi for you.
Wi-fi wireless network advantage 1: Wider bandwidth
Though IEEE goes to bring 802.11 standard data rate up to giga or several gigas after starting two projects, but not formed first drafts yet either so far.
The one a bit more actual is that 802.11n standard has raised a grade of data rate, can meet different functions and apparatus, at present, all 11n wireless transmitters support two space data flows, send and the receive data can be used two or three antenna assembly, the apple newest wi-fi iPod Touch contains one richly and openly (BroADCom) Wireless chip,support 11n standard.
There are three, four data flows soon, the data rate can reach 450Mbps and 600Mbps respectively. At the beginning of 2009, Quantenna communication show it has already succeeded in developing 4x4 chip, can bear the weight of the digital television signal flow of high definition.
Wi-fi prepares against supplier Ruckus wireless common creator and CTO William Kish and says: " Though there will not a lot of customer end apparatuses that support 4 spaces to flow, so long as design the access point correctly, can utilize 600Mbps physical layer data rate, will realize the wireless backbone network of the high speed " .
You can join these high tip nodes through 802.11s standard, form the Internet -like wi-fi network with redundant ability.
Wi-fi wireless network advantage 2: Stronger radio frequency signal
More available performance characteristics will present in the wireless chip in 11n, wireless customer end and wireless access point utilize these chips to enable the radio frequency (RF) The signal is more elastric, steady and reliable, in other words like an electric wire.
Wireless chip manufacturer Atheros Companies' CTO William McFarland says: " The technology of physical layer of the new [11n ] will make wi-fi with better function, the message transmission rate is higher in the given range, the transmission distance is longer " .
These performance characteristics include: Low-density parity check code, improve the correction capability; Launch beam forming, it uses the feedback from wi-fi customer end, let an access point process centrally the radio frequency signal of the customer end; Group's code of time of space (STBC) ,It utilizes the multiple aerial to improve signal reliability.
McFarland says: " You forgive the BLDG bringing a note-book with wi-fi function for one week nowadays, you will find the data rate drop or disappear, but after using STBC, connect and continue working " .
Wi-fi wireless network advantage 3: Wi-fi power consumption is lower
802.11n has carried on great innovation in power consumption and management, not merely can lengthen the battery life-span of wi-fi intellectual mobile phone, can also imbed in other apparatuses, such as the medical monitoring aid, the building control system, position tracing label and consumption electronic product in real time. Can monitor and data gathering constantly, can carry on individualizedly on the basis of users' identity and position.
Network world (Network World) The blog host Craig Mathias wrote " Other modern Radio technology can't accomplish, wi-fi can be accomplished now " .
McFarland of Atheros says: " With the construction of the Wireless Local Area Network of enterprises, the infrastructure has already been put in place, only need to add the low power consumption sensor now " .
802.11a wireless communication that announces recently at manufacturer's summit meeting of wireless data communication of embedded wi-fi offers in the form of various cards, let the apparatus use 5GHz wave band not crowded, 11b/g wireless devices that Gainspan offers have a IP software heap, power consumption is very low, a standard cell can run for a few years, Redpine Signals offered a single-flow to imbed in 11n wireless communication.
Wi-fi wireless network advantage 4: Improved safety
Internet's most damaging influence is through stealing the I.D., the denial of service is attacked, the invasion of privacy, spy and lack the injury that the corresponding trust means causes to users, the mobile network makes this situation worse, if users believe in wi-fi opened at present and connect, may make them suffer the crushing risk.
IEEE sanctioned 802.11w standard recently, it protects wirelessly and manages frames, makes the wireless periodic line work better, the chief analyst Matthew Gast of Trapeze Networks Company says: " Wi-fi customer end can receive and adopt the message of ' the floor network ' now, may the hacker who break through access point utilizes MAC address to be counterfeit in this information before this, 11w standard has cut off this kind of attack " .
Strategy marketing, Company of Aruba Network, in charge of Michael Tennefoss and say: " Wi-fi will use the security based on identity, in wi-fi network, the security policy is associated with user, but not is associated with port, such an advantage is that users can stay at home, the office premises, the hotel, affiliate and public place are moved, the safety will not be influenced " .
Wi-fi wireless network advantage 5: Cooperation with Africa wi-fi network
If you are T-Mobile wi-fi user, but you are in the hot range that another operator offers now, then you can not use wi-fi. In the future, your wi-fi apparatus can be inquired about to " Extranet (the wireless networks of other operators) " Serve, and can insert Safety Ground, your subscriber personality will be roamed with you, make you use all kinds of wi-fi services.
Use 802.11u standard user after not issuing on wireless network in a flexible way,future wi-fi for will services of they advertisings foreign, so long as the clause that you obey it interlinks them, according to your identity, you can visit the subset of all or some clothes in other networks, in urgent cases, you can obtain the most fundamental connected sum function, 802.11u standard plan examined and approved finally in June of 2010.
Wi-fi wireless network advantage 6: Wi-fi customer end of self-management
Wi-fi the intersection of apparatus and producer think a lot of method make apparatus with wireless access point of them combine, work intelligently already, the autogenous management of wireless access point has been already quite ripe at present, but the management of the wireless customer end is still a blank.
If you adopt the new wi-fi management agreement on access point and customer end at the same time, the cooperation between them will be more interesting.
Imagine wi-fi adapter of your Net surfing, or wi-fi VoIP telephone has not been sending and receiving the wireless signal, or while only sharing the location data, can save the electricity, the access point can reach wi-fi pronunciation meeting reorientation to a more ideal adjacent access point, or on supporting the lower access point to one in reorientation. Wi-fi network can position the position of a piece of customer end, for example, outside the BLDG, or on the street, can be based on these data to award the connective operation of customer end.
802.11v standard may be finished at the end of July of 2010, there will be a lot of enhancement characteristics in wi-fi management, it, in order to count collecting and increasing a counter array, will increase power management, raise the battery life-span, and improve the location data to support.
Wi-fi multimedia of wi-fi alliance accepts and controls the norm to deal with the customer end and coordinate the problem too, this norm, in course of developing, it can let the wireless network consult and manage the conversation of flow media at present, so the high clear video will not cut off wi-fi pronunciation conversation on the same access point, wi-fi alliance is mainly using several associated IEEE standards for the standardard management to considering concrete wi-fi, then increase the extra wireless supervisory function.
Wi-fi wireless network advantage 7: Pass intellectual RF (radio frequency) Management is improved excursively
Lack RF to manage in the former standard, because between access point and customer end, and does not usually understand with adjacent wireless devices each other, they only understand one's own radio wave frequency, this kind of limitation is very difficult too so as to want to manage RF.
For example, when a wi-fi cell-phone enters the range of a certain access point, it will touch off a blind searching course, if the customer end can inquire its access point " Who is your neighbour, which one is to connect the access point best? " ,In this way apparatus and network can cooperate better, meanwhile, wi-fi access point is all right " See " RF environment of getting in the customer end, confirms the weak signal or deficient coverage rate, then take measures to connect optimally.
IEEE 802.11k Radio Resource RR administrative standards that was released last year have solved this problem, but wi-fi apparatus producer has already implemented a series of exclusive function in order to meet the challenge of this one, it is an example that Aruba adaptation is wireless to manage 2.0 technical editions.
Meanwhile, some characteristic pronunciation enterprises that is conceived it that wi-fi alliance uses 11k authorize, the goal optimizes the large-scale one, the environmental conversation quality of the enterprise layer wi-fi pronunciation.
Wi-fi wireless network advantage 8: Wi-fi personal area
Present wi-fi is a connection of carrying the end, future wi-fi network, no matter your apparatus can be connected to other customer end apparatuses everywhere directly, for example the notebook computer that Ozmo apparatus which carries the low power consumption chip lets the peripheral device be connected to you directly through wi-fi.
Wi-fi Direct (WFD) which wi-fi alliance announces recently The project, will let wi-fi card on your notebook computer wind the access point, will be connected to the wireless printer directly, digital camera, the projector, sensor or plasma screen. As a trade norm, WFD will be led into the new protocol implementation in the firmware, do not need to change the hardware in this way.
Meanwhile, wi-fi access point, through 802.11z standard (scheduled to finish in July of 2010) Also can turn into a point-to-point connection engine, it will offer for the fact that direct connection is disposed and expand, the customer end apparatus asks for permission to be connected to the customer end apparatus another one from an access point directly, but the data are not through the access point, the customer end is still connected with access point, offer complete security and supervisory service by access point.
Gast of Trapeze says: " Expand by these DSL, under not giving up the advantage situation of the infrastructure, have raised the efficiency of direct communication " .
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