DPCCH Pilot Symbol Power Boosting for Channel Estimation
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Solution Overview
Problem
In heterogeneous wireless networks, the imbalance between uplink (UL) and downlink (DL) cell borders leads to unreliable reception of control information, particularly for user nodes connected to both macro and low-power nodes, resulting in weak uplink signals and interference issues, which degrade system performance and link quality.
Innovation Solution
The method involves boosting the power of the Dedicated Physical Control Channel (DPCCH) by multiplying it with an additional amplitude gain factor, specifically boosting only the pilot symbols, to enhance channel estimation quality, while keeping the power of other physical channels relative, and then removing the additional power from the channel estimate to maintain the original DPCCH power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user node boosts the power of the DPCCH to improve channel estimation quality, then the channel estimation robustness is improved, but the power consumption increases and other physical channels may be affected
Solution Approach 1:
The patent segments the DPCCH into pilot symbols and other symbols, applying power boosting only to the pilot symbols. This segmentation allows the channel estimation function to be enhanced without unnecessarily boosting the entire DPCCH power, thereby reducing overall power consumption while maintaining estimation robustness.
Solution Approach 2:
The patent applies local quality enhancement by selectively boosting only the pilot symbols portion of the DPCCH. The pilot symbols receive additional power to improve channel estimation quality, while other symbols maintain their original power levels, creating a localized quality improvement where it is most needed.
2Reliability
If the power of the DPCCH is boosted to enhance channel estimation, then the control information reception reliability is improved, but interference with other channels increases
Solution Approach 1:
The patent segments the DPCCH transmission into pilot symbols and other symbols, applying power boosting exclusively to the pilot symbols. This segmentation ensures that only the channel estimation portion receives additional power, preventing excessive interference to other physical channels while maintaining control information reception reliability.
Solution Approach 2:
The patent implements local quality enhancement by applying power boosting only to the pilot symbols within the DPCCH. This localized approach improves the quality of channel estimation without unnecessarily increasing the power of other symbols that could cause interference to other channels.
3Measurement precision
If the additional power is not removed from the channel estimate, then the channel estimation quality appears improved, but the original DPCCH power levels are distorted
Solution Approach 1:
The patent extracts the additional power effect from the channel estimate by removing the power boosting factor after estimation is completed. This allows the channel estimation to benefit from the boosted pilot symbols during the measurement process, while the final estimate reflects the original DPCCH power levels, maintaining system stability.
Solution Approach 2:
The patent applies power boosting as a preliminary action during the channel estimation process, then removes it afterward. This preliminary enhancement improves the quality of the estimation measurement, while the subsequent removal ensures that the original power level relationships are preserved for subsequent processing.
Data Source
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AI summary
A method in a network node for enhancing a channel estimate based on a Dedicated Physical Control Channel, DPCCH, between a user node and the network node is provided. The DPCCH has a first power. The network node receives (501) the DPCCH. The first power of the DPCCH is boosted with additional power, resulting in a second power. The network node then obtains (502) a channel estimate based on the DPCCH comprising the second power. As soon as said channel estimate is obtained, the network node removes (503) the additional power from the DPCCH based channel estimate.