Power Control and Rate Adaptation in WCDMA. By Olufunmilola Awoniyi. Contents. Overview of WCDMA Paper summary - Goal System Model and Assumptions Approach Simulation Results Comments. WCDMA.
By Olufunmilola Awoniyi
- Europe - UMTS (asynch).
- Japan - Core-A (asynch)
- Korea - TTA (I & II) (TTA I – synch, TTA II – asynch)
- US - CDMA2000 (synch)
- ITU - IMT-2000
*ARIB – Association of Radio Industries and Businesses
*ETSI – European Telecommunications Standardization Institute
*IMT- 2000 – International Mobile Telecommunications 2000
*ITU - International Telecommunication union
*TIA – Telecommunication Industry Association
*TTA – Telecommunication Technology Association
*UMTS - Universal Mobile Telecommunications System
- Power adaptation is a function of spread bandwidth, data rates and QOS requirements.
- The closer the demand for resource is to the available resource, the higher the required transmit power.
with data rates Rbj, where
* MAI – Multiple access interference
- By solving the characteristic polynomial, det[p- IM] = 0
- 1= 2 = , n1 = n2 = n (uniform traffic demands and noise)
- For any power distribution, traffic demand is upper bounded by spread bandwidth.
- The higher the noise or the closer the traffic demands are to W, the higher the required transmit power.
- By solving for a non-trivial solution, for uniform traffic demands,
– (necessary condition for convergence - 1)
- All users transmit the same power and raise the transmit power until interference can be ignored
– (necessary condition for convergence - 2)
1) For all s (for users already connected and those requesting), calculate E() and Var() such that
2) Admission policy –
- Admit -
- Reject -
- Admit light traffic demand -
- Total traffic demand < 0.8W.
- Better to have power constraints (average or total power).