GSM vs UMTS

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kisio - 18 Mar 2004 19:02 GMT

I need some information, why in GSM we need less basestations to cover
specified area than we use in UMTS.
Is there any method to count it?
Thanks a lot.

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James Calivar - 19 Mar 2004 14:57 GMT

> I need some information, why in GSM we need less basestations to cover
> specified area than we use in UMTS.
> Is there any method to count it?
> Thanks a lot.

I am interested too - where did you get this information that more
basestations (or in UMTS, "Node B") entities are required per given coverage
area?

James

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Andreas van Hooijdonk - 19 Mar 2004 23:08 GMT

Within an UMTS (WCDMA) system the bit rate (speed of information
transferred) depends highly on the distance to the base station. As you
move away from the antenna the bit rate goes down. As UMTS must
guarantee a minimum bit rate for certain services to perform well, the
distance to the antennas must never be to great.

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Andreas van Hooijdonk
http://www.gps-practice-and-fun.com

> I need some information, why in GSM we need less basestations to cover
> specified area than we use in UMTS.
> Is there any method to count it?
> Thanks a lot.

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Kolja Kress - 24 Mar 2004 13:40 GMT

> I need some information, why in GSM we need less basestations to cover
> specified area than we use in UMTS.
> Is there any method to count it?
> Thanks a lot.

UMTS uses higher frequencies in order to achieve
higher data bandwidth. Friction and absorption are
higher for those frequencies than using GSM, as far
as I know. I don't think that there's a good method to
calculate UMTS/GSM relation because UMTS uses dynamic
cell sizes (cellbreathing). Building the UMTS network
will depend on traffic and user count for every single
place...

- Kolja

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