Question about IEEE

[blinkonly]

Hi, i'm trying to realize a VoWifi system, knowing this i read that using IEEE 802.11e but it is hard to find (because still not available i think), and i wanted to know if it will have a lot of difference if using IEEE 802.11g.
And about how much connection in the same time could i have on each transmitter (about 5 maybe?)


Thank you for answers.

[wiology2005]

I'm not sure about 11e.

But currently you can expect 8 and in better conditions up to 12 VoIP sessions per access point.

Have you decided yet on your network components ? How many VoWifi users are you expecting ?

Good luck!

[blinkonly]

i still not decided about my networks components

i think that 8 could be the minimum that i can accept but 12 would be better of course.

I need a litle bit of help to choose my components.

[Skurk]

802.11 provides Quality of Service, which will probably be necessary for the commercial VoWiFi.
You should start with a,b,g - focus on power consumption ( if it's a handheld) and then migrate to 'e' if possible

Good luck
Skurk

[educzer]

As per my understand, 802.11a,b,g are Physical layer specification while 802.11e provides the support of QoS, which is a higher layer than the physical layer. (Sorry that I am not really familiar with 802.11e, so please correct me if I am wrong) So they are regarding to different layer in the OSI model. So it is not meaningful to compare 802.11g toward 802.11e.

For example if you are implementing a wifi-IP phone, you will need to implement the 802.11e for QoS but you also have to decide whether you should go for 802.11a,b or g for the physical layer.

802.11a is of 5G Hz band and provide 54Mbps, 802.11b and g is of 2.4G and b if providing 11Mbps and g is providing 54Mbps. b and g is of the same RF band but different modulation.

[M/Q]

You are correct, except that 802.11a/b/g encompass both Physical as well as MAC layers. This link maybe of some help.

http://www.wi-fiplanet.com/tutorials/article.php/2107261