HSDPA Vs. HSUPA Latency differences?

Originally Posted by JoeyDee

I remember someone saying albany was indeed HSUPA 3.6

I don't really care about that though, my question is if there's supposed to be a latency improvement going from hsdpa to hsupa?

Originally Posted by scaredpoet

Sorry, I'm not going to be able to fully explain it the concept of Transmission Time Interval in a forum in a way that you'll easily understand, without boring everyone else. I suggest you read up on it though:

http://en.wikipedia.org/wiki/Transmission_Time_Interval

In a nuthsell: HSUPA implements changes to the uplink channel that permit for a faster TTI (DPA already has a relatively fast TTI, but clearly not fast enough to overcome latency issues). Data encapsulation is accomplished more quickly, and one of the nice side effects of this (aside from faster uplink speeds) is reduced overall latency.

Quote:
Sure HSDPA has a slower uplink, but speed (throughput) and latency usually only affect each other if the connection is maxed out.


Not always true. The encapsulation layer plays a huge role in latency. Another factor is the error correction method used and what kind of reduction on transmission efficiency it imposes. This is also true fixed-line broadband as well (see this FAQ on Fast Path vs. Interleaving for an example.

Originally Posted by s3ct0r3

I really can't say because I've nothing to compare, but I highly doubt it. The only difference I can forsee is the amount of porn a person can download will have been doubled slightly–that's about it.

I've read a lot of places saying that the wireless carriers will always have horrid latency ... because they're wireless and have a crapload of interferrence.

I know .. I didn't answer your question, but I speculate that it really won't be much at all because my number always changes. I just did two tests and got 2 completely different numbers (302ms and 509ms) under 3-bar EDGE.

EDIT: I stand corrected:

Originally Posted by locust43

EDGE in my area latency is 679, 3G is only 166

Originally Posted by JoeyDee

It's hsdpa, I work for radio shack, so I can get the 3rd party employee plan for the aircard, which is the same price as sprint's 3rd party plan. The reason why I'm leaning towards at&t is they probably have more backhaul for data to thier cell sites, while Sprint only has 1 T1 per tower in my area. So i'm trying to get a better connection for the same price.

Originally Posted by enigma99a

Yeah, ATT has 2 T1s per tower and now going to 3 per tower on some (but not all) with the coming of 3.6 HSDPA

Originally Posted by enigma99a

Remember transport is free now Since it became AT&T

Originally Posted by S0nIc_201

Im sort of confused, what exactly is the difference between hsdpa and hsupa?