I think you have your latency numbers backwards. In my experience, HSDPA has higher RTT than WiFi. Why would you limit your Wifi to A/G? If you're using 5Ghz (A), much better to go to N than A. N has slight advantages over G in the 2.4Ghz realm. Your stated packet loss rates are obscenely high and loss at those rates would severely degrade user experience. Loss over 1% is enough to cause significant slow-down in TCP short-lived or interactive flows and 2% is more than enough to effect even longer continuous data flows. I have not done comparisons of average loss rates between WiFi and 3G services where the loss rates were so high because either one would be basically unusable until the packet loss was reduced. Owen On Aug 26, 2010, at 9:32 AM, Richard Barnes wrote:
On Thu, Aug 26, 2010 at 6:26 AM, Daniel Migault <mglt.biz@gmail.com> wrote:
Hi,
We are testing protocols on our lab platform and we would like to simulate communication 2 types of communication : - From terminals to service platform using a 3G (HSPA / HSPA+) Access connection - From terminal to service platform using a WiFi Access connection
We are using dummyNet to simulate the links so we are interested in IP characteristics layers for Packet loss Rate, bandwidth and latency. Values depends on multiple factors, but we would like to know what mean values are considered when services are deployed.
Currently we are considering the following values. Packet Lost Rate for L2 seems 7% for Wifi and 5% for 3G. We are wondering how L3 is affected?
Parameter | Wifi (802.11a/g) | 3G (HSDPA) Latency 100 ms 60 ms Bandwidth 5 Mbps 3 Mbps Packet Lost Rate XXX XXX
Any comment links will be appreciated.
Regards, Daniel -- Daniel Migault Orange Labs / Security Lab +33 (0) 1 45 29 60 52 +33 (0) 6 70 72 69 58