power control iii
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Power Control III
Algorithm and Parameters
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HW III Power Control Flow
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HW III Power Control Main Changes
The difference of HW II and HW III Power Control algorithm are:
• Initial Discarded MR. number
At the initial stage of channel seizure, the MR data is considered unstable/ fluctuating. So to avoid Power Control inaccuracy, system discards some initial measurement reports.
In HWII: Discards 4 initial MR (fixed)
In HWIII: Set by parameter- Signal/Traffic Channel Discard MR Number
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HW III Power Control Main Changes
• MR Interpolation Method
The interpolation for lost values in the missing Measurement Reports are optimized.
MR1 MRX MRX MR4 MR5
In HWIII, the interpolation value is as below:
If the Rx Level value is lost, the recovered value for missing MR is taken from the last measurement report.
RxLev (MRX) = RxLev (MR1)
If Rx Quality is lost, the interpolation value is 7.
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HW III Power Control Main Changes
• MR Filtering
In HWIII, the receive quality is converted to carrier-to-interference (C/I). The mapping is as below:
Then the C/I and the Receive Level shall be filtered using Exponential filter and slide window.
In HW II, filtering is based on mean value filtering.
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HW III Power Control Main Changes• MR Filtering
Exponential Filtering:
Receive Level
Receive Quality
Where: k= serial number of MR
a= exponential filter coefficient = 1/ (2W/2); where w= exponent filter length parameter
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HW III Power Control Main Changes• MR Filtering
After Exponential Filtering, the result will be considered in the sliding window:
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HW III Power Control• BTS Power Control Step Calculation
In HWII, power control decisions of the receive level and receive quality are performed separately. The final decision is performed based on separate decisions.
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HW III Power Control• Power Control Step Calculation
In HWIII, a universal decision formula that considers the receive level and receive quality is performed.
Step (k) = - {sfactor * (Bs/Ms TxMaxPower – g(k) – SThr) + q factor* (qa_filtered (k) + Q0ffFh – Qthr)}
Sfactor= HWIII DL RexLev Adjust Factor
Qfactor= HWIII DL Rex Qual Adjust Factor
SThr = (SThrUp + SThrLow)/2
QThr = (QThrUp + QThrLow)/2
qa_filtered (k)= MR filtered receive quality converted to C/I
Q0ffFh= Frequancy hopping gain
g(k)= gain of radio channel (Pathloss of the channel)
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HW III Power ControlExample:
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HW III Power ControlExample:
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