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Wireless Mesh Networking White Paper Series

Back-NA True 802.11n Wireless Mesh Network Backbone of a True End-to-End Bandwidth Up To 300Mbps

http://www.p2mt.com

Address: Unit 310A, 3/F, Core Building 1, No. 1 Science Park East Avenue, Hong Kong Science Park, Shatin, N.T., Hong Kong

Tel: (852) 39051880 Email: [email protected]

Wirelessing the world......with no limitation

P2 Mobile Technologies Limited


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Page 2 2011. P2 Mobile echnologies Limited. All rights reserved.

1. Te Current State of *802.11n* Wireless Mesh Networks

Ever since the 802.11n standard has been published in October 2009, it has overwhelminglychanged the entire Wi-Fi industry due to, thanks to its adaption o MIMO technologies, an almost6-old increase in bandwidth compared with the then de acto standard 802.11g Wi-Fi technology (i.e.,300Mbps vs. 54Mbps). As a result, the 802.11n based routers have quickly stolen the spotlight and be-

come the new de acto standard in virtually any Wi-Fi market. Users can now enjoy a signicant boostin bandwidth that can go as high as 300Mbps.

Majority o these Wi-Fi router vendors, however, have only implemented the access part, orthe inrastructure mode, o the 802.11n standard. echnically speaking, to build a Wireless Mesh Net-work (WMN), the backbone part, or Ad Hoc mode, o the 802.11n standard is required. In otherwords, the players in the WMN industry must rst implement the Ad Hoc mode o 802.11n, beore theycan roll out their ully 802.11n compliant WMN products to the market. Te bad news is that, the AdHoc mode o any particular 802.11 version means extra R&D eort on top o its inrastructure modecounterpart. Tis normally causes signicant delays or the vendors to introduce the WMN products

supporting the latest and greatest 802.11 standard. For example, the 802.11n inrastructure mode prod-ucts have long been in the market since the very rst day o its publication in October 2009, while the*truly 802.11n* based WMN product is still not seen in the market yet.

Te catch o the term *truly 802.11n* in the last paragraph is worth more discussions here.Many WMN vendors like to claim that their products do support 802.11n. In reality, many o thoseclaims are only valid at the access link o the WMN, but not valid at the backbone. In other words,these WMNs so built would appear to be 802.11n enabled, as the users devices would appear tobe connected to an 802.11n Wi-Fi network because their 802.11n enabled device, such as notebook,smartphone, iPad, etc., has detected an 802.11n access link with bandwidth o 150Mbps or even up to300Mbps. However, the WMN backbone that actually carries the data through the entire WMN is run-ning with 802.11a/g standard which only has a bandwidth o up to 54Mbps. In other words, regardlessthe bandwidth seen by the user device, the actual bandwidth inside the WMN is bottlenecked by thebackbones 54Mbps. Figure 1 illustrates this problem.


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2011. P2 Mobile echnologies Limited. All rights reserved. Page 3

Figure 1: raditional *802.11n* WMN -- the bandwidth is bottlenecked at the backbone

As a result, many WMN users complain that they do connect with 802.11n (because theirdevices show a bandwidth o 150Mbps or 300Mbps on the screen), yet they notice that the eectivebandwidth is always limited to 54Mbps (i.e., 802.11a/gs bandwidth). Te reason is simple their data isindeed carried by a backbone with bandwidth o up to only 54Mbps. Tereore, the eective bandwidthhe/she actually perceives is only up to 54Mbps.


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Page 4 2011. P2 Mobile echnologies Limited. All rights reserved.

2. Te Back-N echnology

Te research team in P2 Mobile echnologies led by Proessor Peter Chong, Dr. Patrick Lam andDr. Ivan Ho has invented the patent pending Back-N technology to eliminate the bottleneck depictedin Figure 1. Te Back-N technology enables the truly end-to-end 802.11n WMN backbone with whichthe WMN users can now enjoy an end-to-end bandwidth up to ull 300Mbps within the entire WMN.

Tat is, many bandwidth demanding applications such as video surveillance and location tracking cannow take the ull advantage o 802.11ns high throughput as well as WMNs extreme fexibility. Figure 2depicts how the Back-N technology running on our MeshRanger routers boosts the users WMN expe-rience.

Te Back-N technology is important to the success o the market acceptance o WMN becausethe users perceived perormance can now be signicantly improved (close to 6-old!). Te Back-Ntechnology, along with many other advanced eatures aimed to enhance the reliability, convenience andperormance o WMN, is incorporated into all the products in the MeshRanger line.

Figure 2: Back-N -- A rue End-to-End 802.11n Wireless Mesh Network


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3. Conclusions

ogether with P2 Mobile echnologies, we are wirelessing the world with no limitation. Byincorporating the Back-N technology into our MeshRanger line o routers, our customers can nallyenjoy the truly end-to-end 802.11n perormance with the lowest-possible cost and the highest-possibleconvenience when deploying many network applications in which wiring is not easible.

Nowwhat else is your barrier?

2011. P2 Mobile echnologies Limited. All rights reserved. Page 5

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