Wireless netted network Vs Wi-Fi
Wi-Fi is the Technology based on IEEE802.11x standard. At present, Wi-Fi includes IEEE802.11b, 802.11a and 802.11g. What Wi-Fi transmitted and is adopted is low-powered radio signal, penetrability is bad, can’t cross the metal, water or high material of other density. Generally, in the general typical house or office, the transmission distance of Wi-Fi network is probably 25 to 50 meters. In the environment opened outdoors, transmission distance of Wi-Fi network is only about 300 meters too. Because the characteristic of Wi-Fi network is the bandwidth great the communication range is minor, it is excursive not to and does not have, but the price is cheap, so, it is used mainly in the small wireless communication, is defined as the wireless Local Area Network.
At present, Wi-Fi network develops in crowd’s agglomerative place or building rapidly, wait in the hall, office building etc. to serve customer access Internet like the cafe, hotel, airport.
Wireless mesh network (wireless Mesh network) It is one kind, because of route of multihop, technical new network architecture of peer-to-peer network, have the characteristic of moving broadband, it can be expanding constantly dynamically at the same time, ad hoc network, self-supervisory, repairing automatically, self- equilibrium. As to Wi-Fi, wireless Mesh have very great improvements in the intersection of network connection and way, transmission distance and at being excursive, especially it has a characteristic of compatible Wi-Fi, so the wireless Mesh network will be increasing the transmission distance and excursive to Wi-Fi, offer the help greatly on expanding Wi-Fi to employ. Meanwhile, terminal and present popularization and application will bring the advantage for the fast popularization ofwireless Mesh. So, Wi-Fi and wireless Mesh network can be supplemented each other, merged each other.
Wireless netted Vs3G
As everyone knows 3G has already been fermented for a long time, and got support and acclamation from every large world-famous communication company, we have TD-SCDMA proprietary technologies too at home, one may well say that enjoys popular confidence. Does not need to query, 3G is certain to come, just question for one time, but because of the enhancement operation of 2.5G and WLAN, lengthen the life-span of 2G, combine with the appearance of the wireless IP metropolitan area network, and 3G standard and some problems existing technically, make 3G in very passive situation. Up till now, the digital cellular telephone has been already done in some basic application perfectly, such as speech communication, short message, simple news service and quotations on the stock market, etc.. What next mobile communication should solve is to realize more direct video communication between the cellular telephones, but the message transmission rate of actual motion 3G in the middle is unsatisfactory at present. Huge license fee, technical matter, terminal question make the development of 3G shoulder heavy responsiblities, the operator needs put construction into a large amount of fund, manpower and improve, these factors will all bring the huge challenge to development of 3G.
The wireless Mesh network has a characteristic of moving, Broadband too, the business offered with 3G is a bit close. But the alignment of the two is different to some extent. 3G positions in the long haul network, like 2G, 2.5G, will continue as the public mobile communication service, 3G development must rely on the large-scale cloth network, it will be longer. And wireless Mesh is based on IP, positions in the metropolitan area network, the network connection is flexible, can be using among a small circle first, then develop gradually and suitable for the application of Private Network of every vertical trade. It prior to 3G enter market, it have very strong compatibility at the same time, benefit compatible with 3G future, solve the problem that 3G end inserts. ” move and move towards IP ” And ” IP moves towards moving ” It is a communication development trend, believe on the future market of communication, very great possibility exists in the combination of 3G and Mesh.
Wireless mesh network VsWiMAX
WiMAX is the Technology that the market relatively sees well at present, position in the wireless IP metropolitan area network, include 802.16a, 802.16e. The standard of 802.16a has already been made, has only supported the line-of-sight coverage to transmit, the fixed point is inserted, support the point-to-point or P-MP point-to-multipoint network connection; 802.16e standard is still at the stage of developing, excursive to stand and will not look at line transmission and have the certain one. WiMAX mature commercialization products have not been put out yet on the market at present. The very interesting one is, Mesh has commercialization products, the standard has just begun to make, but WiMAX has a standard, there are no commercialization products. From the point of market, though wireless Mesh and 802.16a are all the application of metropolitan area network, will not produce any competition, wireless Mesh moves the metropolitan area network, the goal is to offer service of moving Broadband for the individual in the Private Network; Point-to-point or multi-point fixed access of dot pair that and 802.11a solved. Treat 802.16e products (joined and moved the characteristic) Come out, may have competitive relation with the wireless mesh network, but because the standard has not come out yet at present, so also there are some uncertain factors.
On the whole, in occupying the space of market, the wireless mesh network has already been prior to WiMAX, 3G to enter the market. Meanwhile, the wireless mesh network can rely on Wi-Fi terminal station already accepted by the market to develop rapidly too. Analyze technically, wireless mesh network, Wi-Fi, WiMAX can be supplemented each other each other, make up wireless MAN together. Wi-Fi is with the cheap cost, the application that popularizes occupies the end LAN to insert the market, the fixed point that WiMAX can be regarded as the range of metropolitan area is inserted, the wireless mesh network can realize the inner movementBroadband private communication network of the range of metropolitan area. Certainly, with the constant development of Technology and market, wireless mesh network and 802.16e and 3G of future are at the place where really focused on pile the aspect of business, therefore will bring certain competition, but the conclusion that we can draw at present is: The complementarity between them should be great in competitiveness.
No comments:
Post a Comment