[e2e] Opportunistic Scheduling.

Hi to all.

Some weeks ago, I asked some questions about this topic on the e2e-list.   Perhaps, the TCCC list might be more appropriate. However, I´m not quite sure. So, if I´m completely wrong here, I would appreciate if someone can please give me a hint.

I refer to systems like the Qualcomm 1xEV-DO wireless system, i.e. to systems with a high data rate TDM downlink from a base station (BS) to several (mobile) terminals (UE) and dedicated CDMA uplinks from the UE to BS.

To my understanding, at BS there is one queue per UE. All queues are served in turn and the question is which scheduling mechanism is appropriate.

Now, there is a huge amount of literature about this issue and perhaps I cannot place all of my questions into this one post, but let me please ask the following few.

1. In uplink direction, CDMA is used. To my understanding, the use of CDMA requires a rather precise channel state model at least for the purpose of propper power control. So the question is: Can I reasonably assume a channel model on each terminal which particularly allows the terminal to identify periods of "locally high SNR", i.e. periods of constructive interference when Rayleigh fading is considered, and periods of "locally low SNR", i.e. periods with destructive interference respectively?

To my understanding, each terminal issues a "data rate control" message once in a time slot and the content of this message could be derived from such a channel model.

Is this correct?

2. When I look at the "opportunistic scheduling" algorithm as used e.g. by Jalali, Padovani and Pankaj, I honestly do not understand how the rationale of Kelly´s "Charging and Rate Control for Elastic Traffic" paper does apply to this algorithm.

Do you need help?
In addition to our free technical library, Pantek provides professional IT services to companies who utilize Open Source software: Learn more about Pantek's Technical Support offerings Place an order for 24/7/365 Technical Support here Learn more about Pantek, who we are, and what we do Chat with a Live Operator Related postel.org Links end2end-interest Request more information about Pantek

Could someone please give me some hints on this one?

Thanks

Detlef Received on Mon Jul 2 11:44:33 2007