News Forum Phone database

> New Topic
> Reply
< Esato Forum Index > Sony Ericsson / Sony > Symbian phones > P1i fails on m.youtube.com Bookmark topic

@Nipsen

Interesting, now got one of the BBC audio streams up as far as 45mins! with power save off - rts threshold of 1468. Gonna try again later with power save on......

Updates as events warrant

[EDIT : The stream got to well over an hour before it bugged out, i will try again with power save on tommorrow, when i have a full battery again!]

[ This Message was edited by: pnf1973 on 2007-10-15 21:19 ]
--
Posted: 2007-10-15 21:57:36
Edit : Quote


My investigations into the P1's wlan continue..... I checked my logs from last night's streaming test - it appears that the p1 only uses the 1mbps speed!

Basically I started a large download off on my laptop. Packet analysis showed it using the 24-36mbps speeds, then I turned the wlan on my p1 on and the router suddenly stopped sending at any of the g speeds. I expected this, wlan always works at the lowest speed of any connected client for all connected clients, but I expected (as I was only a few feet from the router) to see packets continue to be received on the 11mbps band (the maximum of wifi b), but no, as soon as the p1 connected all packets from the router were in the 1mbps band! This would explain rather alot of connection issues with timeouts and what not - especially when the router has more than one connection active. I confirmed this further by then switching off the wlan on my p1, after a few mins the downloads started to come through using the 24mbps speed again.

I can understand that battery life is important to SE, but this is somewhat silly IMHO, remember that when the P1 is on the WLAN that ALL clients connected to that network will be forced to use the 1mbps speed! It would not take many active connections to swamp the available bandwidth at this speed, causing slow down for all.

Now my ADSL is only a basic one, 512kbps, but those of you lucky enough to be able to get 2meg or even more you will cause a significant slowdown in browsing speeds for other users each time you connect your P1 to your router!
--
Posted: 2007-10-16 17:10:24
Edit : Quote


*nods*. Think it's possible that's just the implementation of the wlan and the authentication handshake? I mean, I've seen better speeds than 150-180kb/s on larger networks. But like you, I have 2mbit max some times on my home- network (I mean, I have that anyway, because of another laptop with a lousy modem, and a cheap AP that struggles all the time..).

It's just that reducing the size of the authentication packages can sometimes help reduce problems with packet- loss. It won't remove packet loss or interference, so..

edit: eh? I disabled some function called "Spanning tree", and things suddenly moved a lot quicker.. hmm.. no, I give up.

[ This Message was edited by: Nipsen on 2007-10-16 22:42 ]
--
Posted: 2007-10-16 20:05:33
Edit : Quote


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

All you wanted to know about the spanning protocol but were afraid to ask. Never heard of it myself.

Looks like it just adds overhead unless you have lots of nodes on the network to co-ordinate.

But anyways, yes, the speed of the connection is just a parameter in the handshake - so it should be a simple job to actually speed that up. Well, simple if you're SE, not simple for us. Come on SE! Listen to us, the users! (like that'll make any bloody difference) Myself, I'd like the option to set the speed of the wlan. I'd probably just leave it on 1mbps to keep my battery life but it would be good to be able to change it.
--
Posted: 2007-10-17 00:00:43
Edit : Quote


Thanks.. I'll ignore it until I have to setup a bridged lan of some sort *cough*..

Still.. as I said, I've seen better speeds with the p1 on other networks. So it would make sense if the implementation is just picky with the routers. Or, that the problems have something to do with what sort of authentication is used, or what sort of handshake frames the ap uses (there are different implementations out there before the wpa was included in 802.11i, after all. Perhaps they focused on commercial Radius authentication, and skipped past the early psk implementations?)..

I mean, I've seen several times that a network can easily handle different speeds on different units (even my lousy router could do that). Even if some of the units were struggling with connecting. It was the same thing with someone I know who has a tytnII - it would fail to connect, and then manage to hook up after a long while (i.e., the handshake takes very long). And then it would be stuck on either 1 or 2mbit, and then drop out once in a while, even when in close range. As I said, it's the same thing I've seen on a laptop with a lousy modem, or that's using an "early" Wireless Zero implementation on windows.

So I'm guessing some of the hangs are caused by exceptions that aren't handled extremely well in the implementation (even if the p1 works better than certain other units I've seen). Then again - wifi is all about exceptions and error- correction.. so...
--
Posted: 2007-10-17 12:57:28
Edit : Quote


Well it all depends where the problem lies. I was thinking that it was a driver issue at the SE level, however, I have seen some very similar posts to these on nokia forums. Maybe this IS a symbian issue after all?

Again, the common theme to the Nokia forums seems to be, DHCP timeouts causing the phone to report connected by not browse the net, sudden disconnects etc etc. They also say turning off the power save seems to help alot.

Given the number of different manufacturers of APs I guess its not too surprising that there are incompatibilities between them all. Its hard enough to diagnose wlan issues on a pc, SE should do something to make it easier on the p1/p990 & W960.
--
Posted: 2007-10-17 13:08:17
Edit : Quote


Mm. But it wouldn't really suprise me if it's something simple like the beacon interval. For instance, if there's a mininmum save profile on the p1 as default, it would have to re- initiate the handshake, or negotiate the speeds, every time a new connection request comes up - if the AP doesn't agree with the implementation. I've seen that before, too.

Still, the strange hangs and long freezes.. it should be able to handle even a bad connection and all the rest, without stopping like that. It's as if some of the requests to the wlan api in symbian isn't programmed well, and the entire thing freezes if there are more problems than expected.. *shrug*

(edit: all right, no more shamanic debugging for now)

[ This Message was edited by: Nipsen on 2007-10-17 12:34 ]
--
Posted: 2007-10-17 13:33:13
Edit : Quote


Um.. Just happened to push this link, and thought it was pretty interesting.

http://www.telexy.com/Support/Publications.aspx?PublicationId=6

These guys found much of the same strange behaviour on nokia- phones....? When trying to figure out why they would get so low speeds on g-mode, and wifi in general, and so on.

And they conclude it's probably a limitation or a problem in the hardware- layer, or on the modem.

Strange. So, either it's a symbian implementation of the hardware abstraction, or it's a hardware fault, or some sort of translation issue going on with the chipset..
--
Posted: 2007-10-22 13:51:42
Edit : Quote



Word.
--
Posted: 2007-10-22 15:48:27
Edit : Quote


Ha. That just goes to show. It must be the symbian implementation of the network layer then.

I'll bet they simply don't allow a negotiated connection over 11mbs with a router - regardless of its mode.

I will also bet that this is a power saving function. It also offers some hope that a firmware update will allow the user to set the speed of the connection - and drain their battery in 5secs flat

[EDIT] Having just read that through again, it seems that the n91 they used basically connected at the SAME speed for either a b or g connection! Does that mean that the p1 WILL connect to a g only router - it will just get b speeds?? I might try that later!

[EDIT] that should have said 11 from the start, not 1 o_O

[ This Message was edited by: pnf1973 on 2007-10-22 15:28 ]
--
Posted: 2007-10-22 15:51:56
Edit : Quote

---

New Topic   Reply

Forum Index