E-DPDCH Gain Factor Calculation in Compressed Mode
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Solution Overview
Problem
In WCDMA systems, the E-DPDCH gain factor calculated in compressed mode does not accurately reflect the transmit power required, leading to wasted power and reduced system capacity.
Innovation Solution
A method to determine the E-DPDCH gain factor in compressed mode by adjusting the formula to include the number of E-DPDCHs for initial data transmission, using a combination of DPCCH gain factors and pilot bits, which accurately calculates the transmit power, thereby reducing power waste and enhancing system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the prior art formula for calculating E-DPDCH gain factor in compressed mode is used, then the calculation is simple, but the transmit power determined is inaccurate leading to power waste
Solution Approach 1:
The patent modifies the E-DPDCH gain factor calculation formula by changing the parameters involved - specifically incorporating the ratio of pilot bits in compressed mode to pilot bits in non-compressed mode, and the ratio of DPCCH gain factors between compressed and non-compressed modes. These parameter changes enable the formula to accurately reflect the actual transmit power requirements in compressed mode, thereby eliminating power waste while maintaining calculation simplicity.
2Productivity
If the E-DPDCH gain factor is calculated using the prior art method in compressed mode, then the calculation process is straightforward, but the system capacity is reduced due to inaccurate power allocation
Solution Approach 1:
The patent introduces a feedback mechanism by incorporating the DPCCH gain factor ratio (between compressed and non-compressed modes) into the E-DPDCH gain factor calculation. This feedback from the control channel gain adjustments ensures that the data channel gain factor accurately reflects the actual power allocation needs, enabling precise power control that maximizes system capacity while avoiding power waste.
3Measurement precision
If the number of E-DPDCHs for initial transmission is not considered in the gain factor calculation, then the formula remains simple, but the power allocation does not match actual requirements
Solution Approach 1:
The patent creates a universal calculation formula that works for both initial transmissions and retransmissions by incorporating the number of E-DPDCHs for initial transmission (L_e,I,i) as a key parameter. This single formula structure handles multiple scenarios (different transmission types, compressed and non-compressed modes) universally, providing accurate power allocation without requiring separate complex formulas for each case.
Data Source
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AI summary
A computer readable medium and corresponding apparatuses for determining gain-factors are disclosed. The computer readable medium includes instructions for: determining an E-DPDCH gain factor in compressed mode according to the number of E-DPDCH required for initial transmission of data. The E-DPDCH gain factor in compressed mode is determined according to the number of E-DPDCH required for initial transmission of data, and therefore, the E-DPDCH gain factor in compressed mode is determined accurately.