Modem and Basestations

Ravilj

Well-Known Member
Joined
Jan 21, 2005
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Location
Sandton, JHB, ZA
Background
I am in the middle of at least 4 basestation coverage maps: Sandton, Bryanston, Rosebank and it would seem Randburg. I have had speeds up to 1Mb quite happily.

The Problem
Last nite I the Randburg basestation went down and guess what I had no bandwidth. I spoke to the helpdesk and they informed me that i connect to Randburg even though its probably the furthest basestation from me, I cant believe for a second that it has the strongest signal.

Question1
Do the modems have a routine in their firmware to determine which basestation has the strongest signal strength...

Answer 1
NO! This was proven last evening when Randburg went down and after switching the modem on and off it still connected to Randburg even though the other surrounding basestations are up!

Question 2
So what does the modem do?

Answer 2
According to the helpdesk the modem determines which basestation is closest, hmmm well this is a load of bollocks since i am about 6km down the road from sandton city.

Quesion 3
Why havent WBS thought about this or done something about this?

Answer 3
I email Shaun about this and he said I should buy a directional antenna... this would be a great solution given the fact that I could actually afford one (R600).

Solution
No hear me out... I cant believe that it is that hard to add a simple routine that cycles through all the basestations testing the speed (which it can do already since you get signal strength readings) and just select the strongest signal?! Cell phones do it why cant iburst modems as well?

Why should they do it?
a) When a basestation goes down your modem should automatically cycle through the other available ones and connect to the next strongest.
- This will not only save time and money that would be lost due to basestations going down but also it will keep the users happy. (and I am sure WBS could use this given the general problems)

b) I will help eliminate slow speeds or degraded bandwidth problems that are actually cause due to weak signals.
- This will also save time and money since no sitting on the phone bitching and moaning and trying to work out what the problem is.

What I am no prepared to do...
As suggested I should put up a metal barrier between my modem and the direction of the randburg tower. To me this is not a solution this is a mere hack.

Yes buying a directional antenna is a possible solution but an expensive one. A simple firmware upgrade is all that in theory is needed with a little for look that looks as follows:
for(i = 0; i < 6; i++)
Code:
MaxSignal=0;
for ( i = 0; i < Number_of_basestations; i++ )
{
if ( Signal(i) > MaxSignal ) MaxSignal = i;
}
// Connect to BaseStation #MaxSignal.
And what would be even cooler is if the modem ran this say every so often, I would be happy to loose a couple of bytes from my cap to make sure that I got a strong signal.

Disclaimer:
yadda yadda hispsky bob...

What are your thoughts?
 
Apart from the fact that there's no MyWireless signal where I am, one of the reasons I decided on iBurst was the alleged omni-directional & auto-base-station-switching & no need for LOS iBurst technology, so far it looks like you're at a major disadvantage if you do not have LOS, which I think drags down the other alleged advantages to the point where they are no longer true.

WBS' Helpdesk have been suggesting this metal tray """solution""" to shield out signal from multiple base-stations bcos they say unshielded confuses the iBurst modems - well if true, it points to a problem with either iBurst as a technology, or the way that WBS have setup iBurst.
 
I forgot to mention that in addition to periodic checks of Signal Strength from available base-stations, there would have to be a check to determine which base-station(s) had the lowest FER% - but I don't know if the iBurst modems are capable of testing that without disconnecting from the existing base-station...
 
Last edited:
I thought the search ability was part and parcel of the iBurst technology. You have ppl driving from A to B listening to streaming audio ? or don't they leave the area covered by a particular BS ?
 
ic said:
WBS' Helpdesk have been suggesting this metal tray """solution""" to shield out signal from multiple base-stations bcos they say unshielded confuses the iBurst modems - well if true, it points to a problem with either iBurst as a technology, or the way that WBS have setup iBurst.

This is a hack not a solution added to the fact that no one really wants to go around hanging up trays around their modem. I really do believe that this problem can be solved with some minor changes in the firmware.
 
Luke7777 said:
I thought the search ability was part and parcel of the iBurst technology. You have ppl driving from A to B listening to streaming audio ? or don't they leave the area covered by a particular BS ?
But than why doesnt my modem switch over to another basestation when the one it was connected to go down even though I turned it off and switched it back on?! This may be true for the PCMCIA modems?!?

Its just small things like this that that make me doubt it.
 
Luke7777 said:
I thought the search ability was part and parcel of the iBurst technology. You have ppl driving from A to B listening to streaming audio ? or don't they leave the area covered by a particular BS ?
I think this thread explains why streaming audio works, and not other things (i.e. the FER% - Frame Error Rate - Uplink!):

[post=168951]Sanity Check: Uplink/Upload Problems - UDP & Streaming Audio[/post]
Ravilj said:
This is a hack not a solution added to the fact that no one really wants to go around hanging up trays around their modem. I really do believe that this problem can be solved with some minor changes in the firmware.
I totally agree with you Ravilj ;).
 
Ravilj said:
But than why doesnt my modem switch over to another basestation when the one it was connected to go down even though I turned it off and switched it back on?! This may be true for the PCMCIA modems?!?

Its just small things like this that that make me doubt it.
Ravilj - maybe it is FER% - lower for some reason from Randburg-BS than any other WBS BS...:D

Maybe [temporarily] try the metal shielding to find out what FER% you are getting from each of the base-stations that are within range - I would be interested to know what you discover :).
 
Ravilj said:
But than why doesnt my modem switch over to another basestation when the one it was connected to go down even though I turned it off and switched it back on?! This may be true for the PCMCIA modems?!?

I was also affected by the Randburg outage last night, and I too had problems on and off while the outage lasted. However, I believe that despite the outage I was still connecting to Randburg, but then getting no further than being able to access cached WBS sites.

If Randburg had not been letting me connect then I would have connected to Sandton. So as far as the intellicell technology of being able to dynamically switch you between towers... in this instance it didn't "know" that there was a problem with Randburg since you could still connect to it. If Randburg was completely disabled (ie a power outage), I believe it would have worked as intended.
 
Gatecrasher said:
I was also affected by the Randburg outage last night, and I too had problems on and off while the outage lasted. However, I believe that despite the outage I was still connecting to Randburg, but then getting no further than being able to access cached WBS sites.

If Randburg had not been letting me connect then I would have connected to Sandton. So as far as the intellicell technology of being able to dynamically switch you between towers... in this instance it didn't "know" that there was a problem with Randburg since you could still connect to it. If Randburg was completely disabled (ie a power outage), I believe it would have worked as intended.
Yeah fare enough but I am talking about signal strength here, during Randburg being down my signal went down from 5 bar to 2-3 bar. The modem should assess the signal and see that it is low and switch to another base station.
 
Ravilj said:
Yeah fare enough but I am talking about signal strength here, during Randburg being down my signal went down from 5 bar to 2-3 bar. The modem should assess the signal and see that it is low and switch to another base station.

A valid point.

But also when WBS experiences outages they need some remote means of disabling further connections to the affected basestation. I'm sure if you could not have connected to Randburg at all, it would have switched you to another station.
 
Ok, dumb question from a new Iburster:
How do you know which base station you're connecting to?
 
I am pretty sure that the switching technology works since the inventors are japanese and they make playstation
 
mlungu1 said:
Ok, dumb question from a new Iburster:
How do you know which base station you're connecting to?

Not a dumb question at all. Actually I believe the only way to know for sure is to ask the helpdesk. But when I once asked the helpdesk I got the worng answer.

It would be a huge boon if there was a simple way to know for sure. For some, it is pretty obvious. But for others like me, you could theoretically be connected to any of 6 different BS's.
 
Slimothy that is an extremely good point :/
/end sarcasm

mlungu1 next time you call the help desk ask them to give you the list of basestations that you have been connecting to.
 
Ok, have done that. The nice part is that the names of the Towers are not reflected on the website under the network status page. There it gives you the area, not the tower name. When you ask "ok, which area is that on your website" you get "I dunno"..............Nice dealing with qualified staff :confused:
tks for the answers
 
About the switching between base-stations, don't know why I didn't remember this earlier, but I now remember something about a base-station fobbing your UT off onto another base-station if the existing base-station gets overloaded.

I don't really remember anything about how the iBurst modem picks which base-station it will attempt to connect to, has anyone read the ArrayComm IntelliCell stuff recently, or info available from Kyocera...?
 
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