Hi Farid,
thanks for your text. In general, I think it looks pretty OK. However,
there is one major comment I have ...
At 00:29 18.01.2002, Farid Khafizov wrote:
>2. Bandwidth Oscillation
>Limited RF spectrum along with high data rate requirement for 2.5G/3G
>wireless systems necessitate dynamic resource sharing among concurrent
>data users. Various scheduling mechanisms can be deployed in order to
>maximize resource utilization. Some of the limited resources in CDMA based
>systems (e.g., UMTS, CDMA2000) are orthogonal codes and RF transmit power.
>Shared channels in UMTS [N1] and supplemental channels in CDMA2000 [N2], [....]
This text suggests that bandwidth oscillation is also a characteristic of
WCDMA/UMTS. This is *not* the case!
The reason for this problem in CDMA2000 seems to be the use of the finite
burst mode which limits the access to the high speed supplemental channel
to 14 time units. In WCDMA/UMTS we have no such mechanism.
Yes, bandwidth can also oscillate in WCDMA/UMTS, *but* on the scale of some
tens of milliseconds. This is certainly not a problem for TCP. The closest
thing to bandwidth oscillation I can imagine in WCDMA/UMTS would be a
periodic switch between a high speed dedicated and the common channel.
However, I don't think any manufacturer or operator plans to do this (it
will result in a very unstable system).
So, please, remove the reference to WCDMA/UMTS from your text.
///Reiner
This archive was generated by hypermail 2b29 : Mon Jan 28 2002 - 09:12:29 EST