PUCCH Power Control via Interference Feedback
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Solution Overview
Problem
The existing power control methods for Physical Uplink Control Channel (PUCCH) in LTE systems are inaccurate, leading to ineffective suppression of network interference when increasing PUCCH transmit power, as the calculated PUCCH transmit power at the user equipment (UE) is not precise, affecting the demodulation success rate.
Innovation Solution
A base station obtains the average interference noise power of the PUCCH and compares it to a reference value; if the difference exceeds a threshold, it adjusts the P0_NOMINAL_PUCCH parameter by adding the signal-to-interference-plus-noise ratio (SINR) to ensure accurate power control, thereby enhancing the PUCCH transmit power and reducing network interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH transmit power is increased to improve demodulation success rate, then demodulation reliability is improved, but network interference increases
Solution Approach 1:
The patent implements a feedback mechanism where the base station measures actual PUCCH interference, compares it with reference values, and sends power control commands to adjust UE transmit power. This closed-loop feedback enables dynamic adaptation to maintain demodulation reliability while suppressing network interference through real-time power adjustments.
Solution Approach 2:
The patent dynamically changes the P0_NOMINAL_PUCCH parameter based on measured interference conditions. When interference exceeds thresholds, the base station adjusts this power control parameter to optimize the balance between demodulation success rate and network interference, allowing adaptive power control rather than fixed power levels.
2Object-generated harmful factors
If PUCCH transmit power is increased to suppress network interference, then network interference is reduced, but power control accuracy deteriorates
Solution Approach 1:
The base station measures actual PUCCH interference and feeds back power control commands to UE. This feedback loop continuously refines power control accuracy by comparing measured interference with reference values and adjusting transmit power accordingly, preventing both under-powering and over-powering scenarios.
Solution Approach 2:
The patent transitions from static power control to dynamic power control where P0_NOMINAL_PUCCH is adjusted in real-time based on measured interference conditions. This dynamic adaptation allows the system to maintain optimal power control accuracy across varying network conditions, preventing the deterioration that occurs with fixed power settings.
3Measurement precision
If P0_NOMINAL_PUCCH is adjusted to improve power control accuracy, then power calculation precision is improved, but system complexity increases
Solution Approach 1:
The patent uses feedback of power control commands from base station to UE to achieve accurate power control. The base station calculates appropriate P0_NOMINAL_PUCCH adjustments based on measured interference and sends these as feedback commands, achieving high power control accuracy through information feedback rather than complex UE-side calculations.
Solution Approach 2:
The base station acts as an intermediary that centralizes the complex power control calculations. Instead of requiring complex power control logic at the UE, the base station performs the sophisticated interference measurement and parameter adjustment calculations, then provides simplified commands to the UE, reducing overall system complexity while maintaining high accuracy.
Data Source
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AI summary
The embodiments of the present invention provide a power control method and a base station. The method includes: obtaining, by a base station, INPUCCH(i), where the INPUCCH(i) is average interference noise power of a physical uplink control channel (PUCCH) carried by radio resources that are allocated by the base station at a subframe i; and sending, by the base station, a parameter P0_NOMINAL_PUCCH(i) for power control at the subframe i. In the embodiments of the present invention, the base station may send a more accurate parameter to a UE, so that PUCCH transmit power which is at the subframe i and calculated by the UE is more accurate, and network interference caused by increasing the PUCCH transmit power is further reduced.