nanog mailing list archives
Re: IP characteristics for 3G and WiFi links
From: Mikael Abrahamsson <swmike () swm pp se>
Date: Thu, 26 Aug 2010 21:37:27 +0200 (CEST)
On Thu, 26 Aug 2010, Daniel Migault wrote:
Parameter | Wifi (802.11a/g) | 3G (HSDPA) Latency 100 ms 60 ms Bandwidth 5 Mbps 3 Mbps Packet Lost Rate XXX XXX
So, if you want to emulate HSPA you need to understand how it works. If you go from "idle" (30 seconds of not sending data) you will see 1-2 seconds of jitter as radio resources are allocated and brought "online", until you can send packets. There are multiple states, either you have HS resources, or you have regular 384k channel, or you basically have "none". All of these have different characteristics.
Packet loss on 3G is really low as it does re-sends itself, normally you'd see muc less than 1% of packet loss, usually a lot lower than that. There is quite a lot of resending and assuring packets are not lost on multiple layers beneath IP in those networks.
-- Mikael Abrahamsson email: swmike () swm pp se
Current thread:
- IP characteristics for 3G and WiFi links Daniel Migault (Aug 26)
- Re: IP characteristics for 3G and WiFi links Seth Mattinen (Aug 26)
- Re: IP characteristics for 3G and WiFi links Seth Mattinen (Aug 26)
- Re: IP characteristics for 3G and WiFi links Richard Barnes (Aug 26)
- Re: IP characteristics for 3G and WiFi links Owen DeLong (Aug 26)
- Re: IP characteristics for 3G and WiFi links Matthew Kaufman (Aug 26)
- Re: IP characteristics for 3G and WiFi links Mikael Abrahamsson (Aug 26)
- Re: IP characteristics for 3G and WiFi links Seth Mattinen (Aug 26)