Differencies between GSM & UMTS

Risk

You said: GSM has radio timeslot, what is alternative in UMTS?

Question: Why do you think UMTS not have radio tiemslots

You said: GSM has user limit for each trx max 16 user per trx, what is alternative in UMTS?

Question: which standard do you say state is relevant to GSM having “trx max 16 user per trx”?

hi risk,

in UMTS, each user is allocated a “Code”, rather than a timeslot and a frequency (carrier).
Thanks to this code, the user is able to send its data over the whole band (5MHz by def.), and this data can be retrieved among all the other signals, thanks to this code (each code is orthogonal with each other)

your second question is : how many codes can be handled by each “TRX” in 3G. This, I don’t know. I think it is not standardized and highly depends on the capacity of the HW. It’s vendor dependent.

regards
pix

hi risk
UMTS has channel elements which are equivalent to time slots in gsm.
A band Channel Element is the resource base required in the Node-B to Provide for one voice channel capacity, including the control plane to Provide for one voice channel capacity, including the control plane signaling, compressed mode, the transmit diversity and softer handover. signaling, compressed mode, the transmit diversity and softer handover.