Roaming and hand over to the Wi-Fi
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The IEEE has officially made the standard wireless protocol that adds functionality 802.11r roaming to Wi-Fi, a technology that will allow users connected to a wireless network, the rapid transition from an access point to another, thus improving the performance of VoIP on LANs with multiple access-point.
The IEEE has worked 802.11r for four years, and the concept has been said since 2005, but the standard was officially approved and published by the IEEE this summer.
The original 802.11 standard was in fact designed for a single access point. Currently, however, is evident in large buildings may need to install complex networks with multiple access points. The transition from an access point to another requires, at present, a minimum latency of 100 ms for the reassociation and even a few seconds to re-authenticate the client connected securely. A situation that makes any difficult conversations set in motion VoIP networks spread across multiple access points.
The new standard 802.11r will move from one access point to another in about 50 ms. The new standard known as Fast Basic Service Set Transition is able to meet the specifications for roaming voice. With this new performance VoIP applications and data in motion will improve considerably.
The fact remains that using the same channel with the same ssid and same network key, as recommended by us here , eliminates roaming. So with more than a year and a half before had suggested the low-cost solution to the problem.
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so if the IEEE is considering the technology "r", this is why we are still at draft-2 of N. It is nice that you always give them more time for VOIP communications, however, think we should also give importance to the bandwidth, especially to the stability of the connection, particularly when it is present, what is called "crowding" the band of 2.4 GHz, because if my router with N, in the same room I can see a movie in HD is on the net, just something standing between the two antennas (walls, etc ...) the connection begins to have difficulty. Then, since almost all wifi connections are at frequencies very close if the neighbor had a connection at a similar rate I think there would be some problems.
Moreover I see no reason to have connections in Fast Ethernet, Giga-door when it might be a good solution, since now it is easy either transfer files even some GB from one PC to another cable.
Also in Italy we are always with connections that have less upload speed of 512Kbps, which I think now are totally inadequate, partly because they are spreading beyond the mail with attachments Gb. Think also sites like panoramio, Facebook (among others) that provide the ability to upload images.
Immeginatevi then the scene of you engaged in a VoIP conversation, maybe even a video (just to increase the occupied bandwidth) and some other person in the house that I upload a file, and saw that the upload bandwidth is saturated! so even if we have a home network with teconologia N, wired or powerline, there is always the problem to release data from the house should take it easy .... and since now send pdf files, including through instant messaging programs is daily practice, think about how long you expect your party download what you posted.