As the next generation of Wi-Fi standard, 802.11n has a unique technological advantage, is also, therefore, is very much from the introduction of the industry's attention. However, on the 802.11n draft 2.0 standard through a whole year after deployment, 802.11n in existing enterprise network deployment is resolved technical problems, but also become the concern of the industry.
recently held in New York, entitled , the experts described on 802.11n wireless LAN in the enterprise's prospects and future potential users and applications.
802.11n accelerated
Aruba Networks, a technology analyst Peter Thornycroft, at the meeting of the 802.11 n the latest draft standards and formal standards and possible discrepancies between the described. (but also the appearance of the user concerned 802.11vht will make 802.11n premature death
Thornycroft, said: start-Fi Alliance 802.11n draft 2.0 standard with the product interoperability and security testing since the 328 kinds of products have passed the Wi-Fi Alliance's certification, in order to ensure product performance 802.11n vendors have introduced further perfect, IEEE draft 6.0, the formal development of new standards, that is the official 802.11n standard, and the standards need to wait until the second half of 2009 to get through, and product certification. test, the previous draft standard is not fully mature. For example, the draft 2.0 standard, usually to support two spatial streams 3x3 MIMO, data transfer rates of up to 300 Mbps 的. and formal standards may double the PHY data rate 4 t 4 MIMO with four spatial streams implementation. These products can also transmit the same signal processing techniques like beam forming, space-time block coding, and to improve and 11a / g compatibility issues.
Thornycroft said: standards will be further extensions, but not on the existing draft 2.0 standard for big changes. If you believe that after the introduction of the final standards, product stability will be better, this is no great need for the draft 2.0 standard to fully meet the needs of users can be assured that use 802.11n draft 2.0 products for network deployment. Mesh network 802.11s draft standard. flow. traditional wireless access points needed to be alone access to the wired network, and wireless mesh networks can be just a line that multiple access points to provide services. traffic from one access point to another access point on, until you find the cable connection point. Although each point also need power supply, but due to lower line rental costs of a wired network, the cost of the entire network down by drop. cases, such as the ad hoc network (wireless LAN that use the temporary emergency relief and military personnel) infrastructure network (ie wireless local area network composed of permanent members of the fixed nodes, typically deployed in municipalities, WISPs, or enterprise). < br> Conway said: common location may be in the stairwell. route, use the MAC address instead of IP address. It creates a single broadcast domain, the deployment has an important influence. Specifically, for each domain, you can only deploy a MPP system, and can only support a single subnet.
Conway said: rarely see 802.11s standards-based enterprise network deployment, there are three main reasons: First, scale, 802.11s nominally support up to 32 access points, but only 16 may actually be effective; the second is can not handle multiple subnets; third is the lack of flexibility, a single MPP systems in a single point of failure, most companies considered unacceptable. Gast said: Work began in 2004, the first draft in July 2007, the standard is expected in March 2010 need to be approved. Gast is a Wi-Fi Alliance Wireless Network Management Working Group leader, the team has been involved in network management certification standard formulation.
Gast said: location, such as RFID and emergency services to provide more accurate positioning. timeliness to support the application needs to be very precise calibration, such as wireless audio and factory floor automation. coexistence of a very important issue, but I do not know will develop here. allows clients to adjust the frequency switching and sleep, so as to achieve the purpose of saving electricity through .802.11 v incoming SIP signaling, wake up in a sleep state of the Wi-Fi phone, the same, or by initiating a remote access management business, you can also wake-up wireless computer. This improvement will help can tell us how these features into products, and facilitate the application of enterprise wireless networks. All participants agreed that many of the most interesting innovation will be the new wireless network applications. 802.11 standard and Wi - Fi certified products allow enterprises to have the ability to build a very strong pipeline, is now fill the pipeline to the richer When the application.
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Onewires Wireless City Journal 2008 fourth ten Wi-Fi Weekly (10.6 ~ 12)
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